CA2329173A1 - Shutter mode microencapsulated electrophoretic display - Google Patents
Shutter mode microencapsulated electrophoretic display Download PDFInfo
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- CA2329173A1 CA2329173A1 CA002329173A CA2329173A CA2329173A1 CA 2329173 A1 CA2329173 A1 CA 2329173A1 CA 002329173 A CA002329173 A CA 002329173A CA 2329173 A CA2329173 A CA 2329173A CA 2329173 A1 CA2329173 A1 CA 2329173A1
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- capsule
- display
- display element
- substrate
- particle
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/37—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being movable elements
- G09F9/372—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being movable elements the positions of the elements being controlled by the application of an electric field
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
- B41J3/4076—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material printing on rewritable, bistable "electronic paper" by a focused electric or magnetic field
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/02—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light
- G02B26/026—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light based on the rotation of particles under the influence of an external field, e.g. gyricons, twisting ball displays
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1345—Conductors connecting electrodes to cell terminals
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field
- G02F1/166—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
- G02F1/167—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field
- G02F1/1675—Constructional details
- G02F1/16757—Microcapsules
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/302—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements characterised by the form or geometrical disposition of the individual elements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133305—Flexible substrates, e.g. plastics, organic film
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2202/00—Materials and properties
- G02F2202/28—Adhesive materials or arrangements
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K10/00—Organic devices specially adapted for rectifying, amplifying, oscillating or switching; Organic capacitors or resistors having a potential-jump barrier or a surface barrier
- H10K10/40—Organic transistors
- H10K10/46—Field-effect transistors, e.g. organic thin-film transistors [OTFT]
- H10K10/462—Insulated gate field-effect transistors [IGFETs]
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/30—Coordination compounds
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
Abstract
An electrophoretic display element includes a capsule having a first, larger surface and a second, smaller surface. The capsule contains a suspending fluid and at least one particle dispersed within said suspending fluid. Application of a first electrical field causes the particle or particles to migrate towards the first, larger surface of the capsule, causing it to take on the visual appearance of the particles. Application of a second electrical field causes the particle or particles to migrate towards the second, smaller surface, allowing the capsule to take on the visual appearance of the dispersing fluid or of a substrate or electrode positioned behind the display element. Displays may be fabricated from multiple display elements arranged on a substrate.
Description
SHUTTER MODE MICROENCAPSULATED ELECTROPHORETIC DISPLAY
Field of the Invention The present invention relates to encapsulated electrophoretic displays and, in particular, to shutter mode encapsulated electrophoretic displays.
Cross-Reference to Related Applications This application claims priority to U.S.S.N. 60/083,252 filed April 27, 1998, the contents of which is incorporated herein by reference.
Background of the Invention Traditionally, electronic displays such as liquid crystal displays have been made by sandwiching an optoelectrically active material between two pieces of glass.
In many cases each piece of glass has an etched, clear electrode structure formed using indium tin oxide. A first electrode structure controls all the segments of the display that may be addressed, that is, changed from one visual state to another. A second electrode, sometimes called a counter electrode, addresses all display segments as one large electrode, and is generally designed not to overlap any of the rear electrode wire connections that are not desired in the final image. Alternatively, the second electrode is also patterned to control specific segments of the display. In these displays, unaddressed areas of the display have a defined appearance.
Electrophoretic display media, generally characterized by the movement of particles through an applied electric field, are highly reflective, can be made bistable, and consume very little power. Encapsulated electrophoretic displays also enable the display to be printed. These properties allow encapsulated electrophoretic display media to be used in many applications for which traditional electronic displays are not suitable, such as flexible displays. The electro-optical properties of encapsulated displays allow, and in some cases require, novel schemes or configurations to be used to address the displays.
"Shutter mode" electrophoretic displays are configured so that the particles can switch between a largely light-blocking (or reflecting) state and a largely light-transmitting state. These displays often are constructed with particles which can migrate between a smaller and larger
Field of the Invention The present invention relates to encapsulated electrophoretic displays and, in particular, to shutter mode encapsulated electrophoretic displays.
Cross-Reference to Related Applications This application claims priority to U.S.S.N. 60/083,252 filed April 27, 1998, the contents of which is incorporated herein by reference.
Background of the Invention Traditionally, electronic displays such as liquid crystal displays have been made by sandwiching an optoelectrically active material between two pieces of glass.
In many cases each piece of glass has an etched, clear electrode structure formed using indium tin oxide. A first electrode structure controls all the segments of the display that may be addressed, that is, changed from one visual state to another. A second electrode, sometimes called a counter electrode, addresses all display segments as one large electrode, and is generally designed not to overlap any of the rear electrode wire connections that are not desired in the final image. Alternatively, the second electrode is also patterned to control specific segments of the display. In these displays, unaddressed areas of the display have a defined appearance.
Electrophoretic display media, generally characterized by the movement of particles through an applied electric field, are highly reflective, can be made bistable, and consume very little power. Encapsulated electrophoretic displays also enable the display to be printed. These properties allow encapsulated electrophoretic display media to be used in many applications for which traditional electronic displays are not suitable, such as flexible displays. The electro-optical properties of encapsulated displays allow, and in some cases require, novel schemes or configurations to be used to address the displays.
"Shutter mode" electrophoretic displays are configured so that the particles can switch between a largely light-blocking (or reflecting) state and a largely light-transmitting state. These displays often are constructed with particles which can migrate between a smaller and larger
-2-electrode. Migration of the particles to the large electrodes allows them to spread out, causing the capsule to take on the visual properties of the particles. Migration of the particles to the smaller electrode causes the capsule to take on the visual properties of the dispersing fluid or of the larger electrode, because the particles are "clumped" together near the smaller electrode.
Another use of this effect is to control transmission of light through the capsule. The drawback to shutter mode displays is that the electrodes must be etched very precisely.
Summary of the Invention An object of the invention is to provide a highly-flexible, reflective display which can be manufactured easily, consumes little (or none in the case of bistable displays) power, and can, therefore, be incorporated into a variety of applications. The invention features a printable display comprising an encapsulated electrophoretic display medium. The resulting display may be flexible. Since the display media can be printed, the display itself can be made inexpensively. In particular, the present invention allows shutter mode electrophoretic displays to be fabricated without requiring finely etched electrodes.
An encapsulated electrophoretic display can be constructed so that the optical state of the display is stable for some length of time. When the display has two states which are stable in this manner, the display is said to be bistable. If more than two states of the display are stable, then the display can be said to be multistable. For the purpose of this invention, the term bistable will be used to indicate a display in which any optical state remains fixed once the addressing voltage is removed. The definition of a bistable state depends on the application for the display. A
slowly-decaying optical state can be effectively bistable if the optical state is substantially unchanged over the required viewing time. For example, in a display which is updated every few minutes, a display image which is stable for hours or days is effectively bistable for that application. In this invention, the term bistable also indicates a display with an optical state sufficiently long-lived as to be effectively bistable for the application in mind. Alternatively, it is possible to construct encapsulated electrophoretic displays in which the image decays quickly once the addressing voltage to the display is removed (i. e., the display is not bistable or multistable). As will be described, in some applications it is advantageous to use an encapsulated electrophoretic display which is not bistable. Whether or not an encapsulated electrophoretic display is bistable, and its degree of bistability, can be controlled through appropriate chemical
Another use of this effect is to control transmission of light through the capsule. The drawback to shutter mode displays is that the electrodes must be etched very precisely.
Summary of the Invention An object of the invention is to provide a highly-flexible, reflective display which can be manufactured easily, consumes little (or none in the case of bistable displays) power, and can, therefore, be incorporated into a variety of applications. The invention features a printable display comprising an encapsulated electrophoretic display medium. The resulting display may be flexible. Since the display media can be printed, the display itself can be made inexpensively. In particular, the present invention allows shutter mode electrophoretic displays to be fabricated without requiring finely etched electrodes.
An encapsulated electrophoretic display can be constructed so that the optical state of the display is stable for some length of time. When the display has two states which are stable in this manner, the display is said to be bistable. If more than two states of the display are stable, then the display can be said to be multistable. For the purpose of this invention, the term bistable will be used to indicate a display in which any optical state remains fixed once the addressing voltage is removed. The definition of a bistable state depends on the application for the display. A
slowly-decaying optical state can be effectively bistable if the optical state is substantially unchanged over the required viewing time. For example, in a display which is updated every few minutes, a display image which is stable for hours or days is effectively bistable for that application. In this invention, the term bistable also indicates a display with an optical state sufficiently long-lived as to be effectively bistable for the application in mind. Alternatively, it is possible to construct encapsulated electrophoretic displays in which the image decays quickly once the addressing voltage to the display is removed (i. e., the display is not bistable or multistable). As will be described, in some applications it is advantageous to use an encapsulated electrophoretic display which is not bistable. Whether or not an encapsulated electrophoretic display is bistable, and its degree of bistability, can be controlled through appropriate chemical
-3-modification of the electrophoretic particles, the suspending fluid, the capsule, and binder materials.
An encapsulated electrophoretic display may take many forms. The display may comprise capsules or liquid drops dispersed in a binder. The capsules may be of any size or shape. The capsules may, for example, be spherical and may have diameters in the millimeter range or the micron range, but is preferably from ten to a few hundred microns. The capsules may be formed by an encapsulation technique, as described below. Particles may be encapsulated in the capsules.
The particles may be one or more different types of particles. The particles may be colored, luminescent, light-absorbing or transparent, for example. The particles may include neat pigments, dyed (faked) pigments or pigment/polymer composites, for example.
The display may further comprise a suspending fluid in which the particles are dispersed.
The successful construction of an encapsulated electrophoretic display requires the proper interaction of several different types of materials and processes, such as a polymeric binder and, optionally, a capsule membrane. These materials must be chemically compatible with the electrophoretic particles and fluid, as well as with each other. The capsule materials may engage in useful surface interactions with the electrophoretic particles, or may act as a chemical or physical boundary between the fluid and the binder.
In some cases, the encapsulation step of the process is not necessary, and the electrophoretic fluid may be directly dispersed or emulsified into the binder (or a precursor to the binder materials) and an effective "polymer-dispersed electrophoretic display"
constructed. In such displays, voids created in the binder may be referred to as capsules or microcapsules even though no capsule membrane is present. The binder dispersed electrophoretic display may be of the emulsion or phase separation type.
Throughout the specification, reference will be made to printing or printed.
As used throughout the specification, printing is intended to include all forms of printing and coating, including: premetered coatings such as patch die coating, slot or extrusion coating, slide or cascade coating, and curtain coating; roll coating such as knife over roll coating, forward and reverse roll coating; gravure coating; dip coating; spray coating; meniscus coating; spin coating;
brush coating; air knife coating; silk screen printing processes;
electrostatic printing processes;
thermal printing processes; and other similar techniques. A "printed element"
refers to an element formed using any one of the above techniques.
An encapsulated electrophoretic display may take many forms. The display may comprise capsules or liquid drops dispersed in a binder. The capsules may be of any size or shape. The capsules may, for example, be spherical and may have diameters in the millimeter range or the micron range, but is preferably from ten to a few hundred microns. The capsules may be formed by an encapsulation technique, as described below. Particles may be encapsulated in the capsules.
The particles may be one or more different types of particles. The particles may be colored, luminescent, light-absorbing or transparent, for example. The particles may include neat pigments, dyed (faked) pigments or pigment/polymer composites, for example.
The display may further comprise a suspending fluid in which the particles are dispersed.
The successful construction of an encapsulated electrophoretic display requires the proper interaction of several different types of materials and processes, such as a polymeric binder and, optionally, a capsule membrane. These materials must be chemically compatible with the electrophoretic particles and fluid, as well as with each other. The capsule materials may engage in useful surface interactions with the electrophoretic particles, or may act as a chemical or physical boundary between the fluid and the binder.
In some cases, the encapsulation step of the process is not necessary, and the electrophoretic fluid may be directly dispersed or emulsified into the binder (or a precursor to the binder materials) and an effective "polymer-dispersed electrophoretic display"
constructed. In such displays, voids created in the binder may be referred to as capsules or microcapsules even though no capsule membrane is present. The binder dispersed electrophoretic display may be of the emulsion or phase separation type.
Throughout the specification, reference will be made to printing or printed.
As used throughout the specification, printing is intended to include all forms of printing and coating, including: premetered coatings such as patch die coating, slot or extrusion coating, slide or cascade coating, and curtain coating; roll coating such as knife over roll coating, forward and reverse roll coating; gravure coating; dip coating; spray coating; meniscus coating; spin coating;
brush coating; air knife coating; silk screen printing processes;
electrostatic printing processes;
thermal printing processes; and other similar techniques. A "printed element"
refers to an element formed using any one of the above techniques.
-4-This invention provides novel methods and apparatus for controlling and addressing particle-based displays. Additionally, the invention discloses applications of these methods and materials on flexible substrates, which are useful in large-area, low cost, or high-durability applications.
In one aspect, the invention relates to an encapsulated electrophoretic display element which includes a capsule having a first, larger surface and a second, smaller surface and containing a suspending fluid and at least one particle. When a first electrical field is applied to the capsule, at least some of the particles migrate toward the first, larger surface. When a second electrical field is applied to the capsule, at least some of the particles migrate towards the second, smaller i 0 surface. The invention features a display element which can be placed in a condition where the display is transparent, or, depending on the characteristics of the particles, substantially opaque or substantially reflective.
In another aspect, the invention relates to an electrophoretic display which includes a plurality of display elements where each element includes a capsule having a first, larger surface 15 and a second, smaller surface and containing a suspending fluid and at least one particle dispersed within the suspending fluid. The display also includes a first substrate defining a plurality of cavities, each cavity adapted to receive one of the plurality of display elements therein. The invention features a patterned first substrate, where the cavities can be created by embossing, by etching, or by engraving, and also features a second substrate that can be disposed over the first 20 substrate to enclose the cavities. The invention features cavities within the first substrate that can be conical, pyramidal, or groove-shaped. The grooves can have cross-sections that are triangular or trapezoidal, or the grooves may have parallel walls.
In still another aspect, the invention relates to a method of manufacturing an electrophoretic display element including the steps of: encapsulating within a capsule a suspending 25 fluid having a first optical property, at least one particle having a second optical property different from said first optical property, and a structural material; orienting the capsule in a predetermined orientation; and treating the structural material to form a structural portion within the capsule that creates a display portion of the capsule having a first, larger surface and a second, smaller surface.
Application of a first electrical field causes the at least one particle to migrate towards said first, 30 larger surface. Application of a second electrical field causes the at least one particle to migrate towards said second, smaller surface. The invention features steps to process the structural
In one aspect, the invention relates to an encapsulated electrophoretic display element which includes a capsule having a first, larger surface and a second, smaller surface and containing a suspending fluid and at least one particle. When a first electrical field is applied to the capsule, at least some of the particles migrate toward the first, larger surface. When a second electrical field is applied to the capsule, at least some of the particles migrate towards the second, smaller i 0 surface. The invention features a display element which can be placed in a condition where the display is transparent, or, depending on the characteristics of the particles, substantially opaque or substantially reflective.
In another aspect, the invention relates to an electrophoretic display which includes a plurality of display elements where each element includes a capsule having a first, larger surface 15 and a second, smaller surface and containing a suspending fluid and at least one particle dispersed within the suspending fluid. The display also includes a first substrate defining a plurality of cavities, each cavity adapted to receive one of the plurality of display elements therein. The invention features a patterned first substrate, where the cavities can be created by embossing, by etching, or by engraving, and also features a second substrate that can be disposed over the first 20 substrate to enclose the cavities. The invention features cavities within the first substrate that can be conical, pyramidal, or groove-shaped. The grooves can have cross-sections that are triangular or trapezoidal, or the grooves may have parallel walls.
In still another aspect, the invention relates to a method of manufacturing an electrophoretic display element including the steps of: encapsulating within a capsule a suspending 25 fluid having a first optical property, at least one particle having a second optical property different from said first optical property, and a structural material; orienting the capsule in a predetermined orientation; and treating the structural material to form a structural portion within the capsule that creates a display portion of the capsule having a first, larger surface and a second, smaller surface.
Application of a first electrical field causes the at least one particle to migrate towards said first, 30 larger surface. Application of a second electrical field causes the at least one particle to migrate towards said second, smaller surface. The invention features steps to process the structural
-5-material within the capsule including polymerizing the material, photohardening the material, thermally treating the material, or melting and solidifying the material.
In yet another aspect, the invention relates to a method of manufacturing an electrophoretic display element including the steps of encapsulating within a capsule a suspending S fluid having a first optical property and at least one particle dispersed within said suspending fluid and having a second optical property different from the first optical property; and shaping the capsule to produce a first, larger surface and a second, smaller surface.
Application of a first electrical field causes the at least one particle to migrate towards the first, larger surface.
Application of a second electrical field causes the at least one particle to migrate towards the second, smaller surface. The invention also features the additional step of providing electrodes which can address the display element.
In another aspect, the invention relates to an electrophoretic display element includes a capsule having a first surface and a second surface. The display element also contains a structural portion adjacent to at least a portion of the second surface of the capsule to create a display 1 S portion wherein the capsule, the display portion including a suspending fluid and at least one particle dispersed within said suspending fluid and having a first, larger surface and a second smaller surface. The invention features a display element which can be placed in a condition where the display is transparent, or, depending on the characteristics of the particles, substantially opaque or substantially reflective. The invention also features a structural portion which can be a polymer, including a thermoset polymer or a photohardenable polymer.
In still another aspect, the invention relates to an electrophoretic display comprising a plurality of display elements, each display element including a capsule having a first surface and a second surface. The display element also contains a structural portion adjacent to at least a portion of the second surface of the capsule to create a display portion within the capsule, the display portion including a suspending fluid and at least one particle dispersed within the suspending fluid and having a first, larger surface and a second smaller surface. The display also includes a first substrate defining a plurality of cavities, each cavity adapted to receive one of the plurality of display elements therein. The invention also features display elements which are individually addressable, and a substrate having cavities which can be conical or pyramidal.
In another aspect, the invention relates to a method of manufacturing an electrophoretic display comprising the steps of manufacturing a plurality of display elements, by encapsulating a
In yet another aspect, the invention relates to a method of manufacturing an electrophoretic display element including the steps of encapsulating within a capsule a suspending S fluid having a first optical property and at least one particle dispersed within said suspending fluid and having a second optical property different from the first optical property; and shaping the capsule to produce a first, larger surface and a second, smaller surface.
Application of a first electrical field causes the at least one particle to migrate towards the first, larger surface.
Application of a second electrical field causes the at least one particle to migrate towards the second, smaller surface. The invention also features the additional step of providing electrodes which can address the display element.
In another aspect, the invention relates to an electrophoretic display element includes a capsule having a first surface and a second surface. The display element also contains a structural portion adjacent to at least a portion of the second surface of the capsule to create a display 1 S portion wherein the capsule, the display portion including a suspending fluid and at least one particle dispersed within said suspending fluid and having a first, larger surface and a second smaller surface. The invention features a display element which can be placed in a condition where the display is transparent, or, depending on the characteristics of the particles, substantially opaque or substantially reflective. The invention also features a structural portion which can be a polymer, including a thermoset polymer or a photohardenable polymer.
In still another aspect, the invention relates to an electrophoretic display comprising a plurality of display elements, each display element including a capsule having a first surface and a second surface. The display element also contains a structural portion adjacent to at least a portion of the second surface of the capsule to create a display portion within the capsule, the display portion including a suspending fluid and at least one particle dispersed within the suspending fluid and having a first, larger surface and a second smaller surface. The display also includes a first substrate defining a plurality of cavities, each cavity adapted to receive one of the plurality of display elements therein. The invention also features display elements which are individually addressable, and a substrate having cavities which can be conical or pyramidal.
In another aspect, the invention relates to a method of manufacturing an electrophoretic display comprising the steps of manufacturing a plurality of display elements, by encapsulating a
-6-suspending fluid having a first optical property and at least one particle having a second optical property different from said first optical property and shaping said capsule to produce a first, larger surface and a second, smaller surface. A substrate is provided defining a plurality of cavities, each cavity adapted to receive one of the plurality of display elements, and at least one of display element is situated within at least one of the cavities defined by the substrate. The invention additionally features the steps of providing electrodes adapted to address each display element individually, and providing a substrate which has depressions that define conical cavities, pyramidal cavities, or grooves.
In yet another aspect, the invention relates to a method of manufacturing an electrophoretic display comprising the steps of manufacturing a plurality of display elements.
Each display element is manufactured by encapsulating a suspending fluid having a first optical property, at least one particle having a second optical property different from said first optical property, and a structural material. A substrate defines a plurality of cavities and each cavity is adapted to receive a display element. At least one display element is situated within at least one of the cavities defined by the substrate. The substrate is oriented in a predetermined orientation and the structural material is treated to form a display portion within each capsule. The display portion has a first, larger surface and a second smaller surface. The invention also features the steps of providing electrodes adapted to address each display element individually, and providing a substrate which has depressions that define conical cavities, pyramidal cavities, or grooves.
In another aspect, the invention relates to an encapsulated electrophoretic display element which includes a capsule having a first surface and a second surface, wherein the first surface and the second surface comprise different projected areas when viewed in the intended viewing direction. The capsule contains a suspending fluid and at least one particle.
When a first electrical field is applied to the capsule, at least some of the particles migrate toward the first surface. When a second electrical field is applied to the capsule, at least some of the particles migrate towards the second surface.
Brief Description of the Drawings The invention is pointed out with particularity in the appended claims. The advantages of the invention described above, together with further advantages, may be better understood by referring to the following description taken in conjunction with the accompanying drawings. In the drawings, like reference characters generally refer to the same parts throughout the different views. Also, the drawings are not necessarily to scale, emphasis instead generally being placed upon illustrating the principles of the invention.
FIG. lA is a diagrammatic side view of an embodiment of a rear-addressing electrode structure for a particle-based display in which the smaller electrode has been placed at a voltage relative to the large electrode causing the particles to migrate to the smaller electrode.
FIG. 1B is a diagrammatic side view of an embodiment of a rear-addressing electrode structure for a particle-based display in which the larger electrode has been placed at a voltage relative to the smaller electrode causing the particles to migrate to the larger electrode.
FIG. 1 C is a diagrammatic top-down view of one embodiment of a rear-addressing electrode structure.
FIG. 2A is a diagrammatic side view of an embodiment of a rear-addressing electrode structure having a retroreflective layer associated with the larger electrode in which the smaller electrode has been placed at a voltage relative to the large electrode causing the particles to migrate to the smaller electrode.
FIG. 2B is a diagrammatic side view of an embodiment of a rear-addressing electrode structure having a retroreflective layer associated with the larger electrode in which the larger electrode has been placed at a voltage relative to the smaller electrode causing the particles to migrate to the larger electrode.
FIG. 2C is a diagrammatic side view of an embodiment of a rear-addressing electrode structure having a retroreflective layer disposed below the larger electrode in which the smaller electrode has been placed at a voltage relative to the large electrode causing the particles to migrate to the smaller electrode.
FIG. 2D is a diagrammatic side view of an embodiment of a rear-addressing electrode structure having a retroreflective layer disposed below the larger electrode in which the larger electrode has been placed at a voltage relative to the smaller electrode causing the particles to migrate to the larger electrode.
FIG. 3A is a diagrammatic side view of an embodiment of an addressing structure in which a direct-current electric field has been applied to the capsule causing the particles to migrate to the smaller electrode.
_g_ FIG. 3B is a diagrammatic side view of an embodiment of an addressing structure in~which an alternating-current electric field has been applied to the capsule causing the particles to disperse into the capsule.
FIG. 3 C is a diagrammatic side view of an embodiment of an addressing structure having transparent electrodes, in which a direct-current electric field has been applied to the capsule causing the particles to migrate to the smaller electrode.
FIG. 3D is a diagrammatic side view of an embodiment of an addressing structure having transparent electrodes, in which an alternating-current electric field has been applied to the capsule causing the particles to disperse into the capsule.
FIG. 4A is a diagrammatic cross-sectional view of a shutter mode display element in a light-blocking configuration.
FIG. 4B is a diagrammatic cross-sectional view of a shutter mode display element in a light-passing configuration.
FIG. 4C is a diagrammatic side view of a display formed of multiple shutter mode display elements.
FIG. 5A is a diagrammatic cross-sectional view of a display formed of multiple shutter mode display elements containing a suspending fluid, at least one particle, and a structural material.
FIG. 5B is a diagrammatic cross-sectional view of the display of FIG. SA
oriented at a predetermined angle.
FIG. 5C is a diagrammatic cross-sectional view of the display of FIG. 5A after the structural material has been cured.
FIG. 6A is a diagrammatic side view of an embodiment of a rear-addressing electrode structure for a particle-based display in which multiple smaller electrodes have been placed at a voltage relative to multiple larger electrodes, causing the particles to migrate to the smaller electrodes.
FIG. 6B is a diagrammatic side view of an embodiment of a rear-addressing electrode structure for a particle-based display in which multiple larger electrodes have been placed at a voltage relative to multiple smaller electrodes, causing the particles to migrate to the larger electrodes.
FIG. 7A is a diagrammatic side view of an embodiment of a rear-addressing electrode structure for a particle-based display having colored electrodes and a white electrode, in which the colored electrodes have been placed at a voltage relative to the white electrode causing the particles to migrate to the colored electrodes.
FIG. 7B is a diagrammatic side view of an embodiment of a rear-addressing electrode structure for a particle-based display having colored electrodes and a white electrode, in which the white electrode has been placed at a voltage relative to the colored electrodes causing the particles to migrate to the white electrode.
FIG. 8 is a diagrammatic side view of an embodiment of a color display element having red, green, and blue particles of different electrophoretic mobilities.
FIGs. 9A-9B depict the steps taken to address the display of FIG. 6 to display red.
FIGs. l0A-l OD depict the steps taken to address the display of FIG. 8 to display blue.
FIGS. 11A-11C depict the steps taken to address the display of FIG. 8 to display green.
Detailed Description of the Invention An electronic ink is an optoelectronically active material which comprises at least two phases: an electrophoretic contrast media phase and a coating/binding phase.
The electrophoretic phase comprises, in some embodiments, a single species of electrophoretic particles dispersed in a clear or dyed medium, or more than one species of electrophoretic particles having distinct physical and electrical characteristics dispersed in a clear or dyed medium.
In some embodiments the electrophoretic phase is encapsulated, that is, there is a capsule wall phase between the two phases. The coating/binding phase includes, in one embodiment, a polymer matrix that surrounds the electrophoretic phase. In this embodiment, the polymer in the polymeric binder is capable of being dried, crosslinked, or otherwise cured as in traditional inks, and therefore a printing process can be used to deposit the electronic ink onto a substrate. An electronic ink is capable of being printed by several different processes, depending on the mechanical properties of the specific ink employed. For example, the fragility or viscosity of a particular ink may result in a different process selection. A very viscous ink would not be well-suited to deposition by an inkjet printing process, while a fragile ink might not be used in a knife over roll coating process.
The optical quality of an electronic ink is quite distinct from other electronic display materials. The most notable difference is that the electronic ink provides a high degree of both reflectance and contrast because it is pigment based (as are ordinary printing inks). The light scattered from the electronic ink comes from a very thin layer of pigment close to the top of the viewing surface. In this respect it resembles an ordinary, printed image.
Also, electronic ink is easily viewed from a wide range of viewing angles in the same manner as a printed page, and such ink approximates a Lambertian contrast curve more closely than any other electronic display material. Since electronic ink can be printed, it can be included on the same surface with any other printed material, including traditional inks. Electronic ink can be made optically stable in all display configurations, that is, the ink can be set to a persistent optical state. Fabrication of a display by printing an electronic ink is particularly useful in low power applications because of this stability.
Electronic ink displays are novel in that they can be addressed by DC voltages and draw very little current. As such, the conductive leads and electrodes used to deliver the voltage to electronic ink displays can be of relatively high resistivity. The ability to use resistive conductors substantially widens the number and type of materials that can be used as conductors in electronic ink displays. In particular, the use of costly vacuum-sputtered indium tin oxide (ITO) conductors, 1 S a standard material in liquid crystal devices, is not required. Aside from cost savings, the replacement of ITO with other materials can provide benefits in appearance, processing capabilities (printed conductors), flexibility, and durability. Additionally, the printed electrodes are in contact only with a solid binder, not with a fluid layer (like liquid crystals). This means that some conductive materials, which would otherwise dissolve or be degraded by contact with liquid crystals, can be used in an electronic ink application. These include opaque metallic inks for the rear electrode (e.g., silver and graphite inks), as well as conductive transparent inks for either substrate. These conductive coatings include semiconducting colloids, examples of which are indium tin oxide and antimony-doped tin oxide. Organic conductors (polymeric conductors and molecular organic conductors) also may be used. Polymers include, but are not limited to, polyaniline and derivatives, polythiophene and derivatives, poly3,4-ethylenedioxythiophene (PEDOT) and derivatives, polypyrrole and derivatives, and polyphenylenevinylene (PPV) and derivatives. Organic molecular conductors include, but are not limited to, derivatives of naphthalene, phthalocyanine, and pentacene. Polymer layers can be made thinner and more transparent than with traditional displays because conductivity requirements are not as stringent.
WO 99/5b171 PCT/US99109172 As an example, there are a class of materials called electroconductive powders which are also useful as coatable transparent conductors in electronic ink displays. One example is Zelec ECP electroconductive powders from DuPont Chemical Co. of Wilmington, Delaware.
Referring now to FIGS. 1 A and 1 B, an addressing scheme fox controlling particle-based S displays is shown in which electrodes are disposed on only one side of a display, allowing the display to be rear-addressed. Utilizing only one side of the display for electrodes simplifies fabrication of displays. For example, if the electrodes are disposed on only the rear side of a display, both of the electrodes can be fabricated using opaque materials, because the electrodes do not need to be transparent.
FIG. 1 A depicts a single capsule 20 of an encapsulated display media. In brief overview, the embodiment depicted in FIG. 1 A includes a capsule 20 containing at least one particle 50 dispersed in a suspending fluid 25. The capsule 20 is addressed by a first electrode 30 and a second electrode 40. The first electrode 30 is smaller than the second electrode 40. The first electrode 30 and the second electrode 40 may be set to voltage potentials which affect the position of the particles 50 in the capsule 20.
The particles 50 represent 0.1 % to 20% of the volume enclosed by the capsule 20. In some embodiments the particles SO represent 2.5% to 17.5% of the volume enclosed by capsule 20. In preferred embodiments, the particles 50 represent 5% to 15% of the volume enclosed by the capsule 20. In more preferred embodiments the particles 50 represent 9% to 11% ofthe volume defined by the capsule 20. In general, the volume percentage of the capsule 20 that the particles SO represent should be selected so that the particles 50 expose most of the second, larger electrode 40 when positioned over the first, smaller electrode 30. As described in detail below, the particles 50 may be colored any one of a number of colors. The particles 50 may be either positively charged or negatively charged.
The particles 50 are dispersed in a dispersing fluid 25. The dispersing fluid 25 should have a low dielectric constant. The fluid 25 may be clear, or substantially clear, so that the fluid 25 does not inhibit viewing the particles 50 and the electrodes 30, 40 from position 10. In other embodiments, the fluid 25 is dyed. In some embodiments the dispersing fluid 25 has a specific gravity matched to the density of the particles 50. These embodiments can provide a bistable display media, because the particles SO do not tend to move in certain compositions absent an electric field applied via the electrodes 30, 40.
WO 99/56171 PCT/t1S99/09172 The electrodes 30, 40 should be sized and positioned appropriately so that together they address the entire capsule 20, There may be exactly one pair of electrodes 30, 40 per capsule 20, multiple pairs of electrodes 30, 40 per capsule 20, or a single pair of electrodes 30, 40 may span multiple capsules 20. In the embodiment shown in FIGs. lA and 1B, the capsule 20 has a flattened, rectangular shape. In these embodiments, the electrodes 30, 40 should address most, or all, of the flattened surface area adjacent the electrodes 30, 40. The smaller electrode 30 is at most one-half the size of the larger electrode 40. In preferred embodiments the smaller electrode is one-quarter the size of the larger electrode 40; in more preferred embodiments the smaller electrode 30 is one-eighth the size of the larger electrode 40. In even more preferred embodiments, the smaller electrode 30 is one-sixteenth the size of the larger electrode 40. It should be noted that reference to "smaller" in connection with the electrode 30 means that the electrode 30 addresses a smaller amount of the surface area of the capsule 20, not necessarily that the electrode 30 is physically smaller than the larger electrode 40. For example, multiple capsules may be positioned such that less of each capsule 20 is addressed by the "smaller" electrode 30, 15 even though both electrodes 30, 40 are equal in size. It should also be noted that, as shown in FIG. 1C, electrode 30 may address only a small corner of a rectangular capsule 20 (shown in phantom view in FIG. 1C), requiring the larger electrode 40 to surround the smaller electrode 30 on two sides in order to properly address the capsule 20. Selection of the percentage volume of the particles SO and the electrodes 30, 40 in this manner allow the encapsulated display media to 20 be addressed as described below.
Electrodes may be fabricated from any material capable of conducting electricity so that electrode 30, 40 may apply an electric field to the capsule 20. As noted above, the rear-addressed embodiments depicted in FIGS. lA and 1B allow the electrodes 30, 40 to be fabricated from opaque materials such as solder paste, copper, copper-clad polyimide, graphite inks, silver inks and other metal-containing conductive inks. Alternatively, electrodes may be fabricated using transparent materials such as indium tin oxide and conductive polymers such as polyaniline or polythiopenes. Electrodes 30, 40 may be provided with contrasting optical properties. In some embodiments, one of the electrodes has an optical property complementary to optical properties of the particles S0.
In one embodiment, the capsule 20 contains positively charged black particles 50, and a substantially clear suspending fluid 25. The first, smaller electrode 30 is colored black, and is smaller than the second electrode 40, which is colored white or is highly reflective. When the smaller, black electrode 30 is placed at a negative voltage potential relative to larger, white electrode 40, the positively-charged particles SO migrate to the smaller, black electrode 30. The effect to a viewer of the capsule 20 located at position 10 is a mixture of the larger, white electrode 40 and the smaller, black electrode 30, creating an effect which is largely white.
Referring to FIG. 1B, when the smaller, black electrode 30 is placed at a positive voltage potential relative to the larger, white electrode 40, particles SO migrate to the larger, white electrode 40 and the viewer is presented a mixture of the black particles 50 covering the larger, white electrode 40 and the smaller, black electrode 30, creating an effect which is largely black.
In this manner the capsule 20 may be addressed to display either a white visual state or a black visual state.
Other two-color schemes are easily provided by varying the color of the smaller electrode 30 and the particles 50 or by varying the color of the larger electrode 40.
For example, varying the color of the larger electrode 40 allows fabrication of a rear-addressed, two-color display having black as one of the colors. Alternatively, varying the color of the smaller electrode 30 and the particles 50 allow a rear-addressed two-color system to be fabricated having white as one of the colors. Further, it is contemplated that the particles 50 and the smaller electrode 30 can be different colors. In these embodiments, a two-color display may be fabricated having a second color that is different from the color of the smaller electrode 30 and the particles S0. For example, a rear-addressed, orange-white display may be fabricated by providing blue particles 50, a red, smaller electrode 30, and a white (or highly reflective) larger electrode 40. In general, the optical properties of the electrodes 30, 40 and the particles 50 can be independently selected to provide desired display characteristics. In some embodiments the optical properties of the dispersing fluid 25 may also be varied, e.g. the fluid 25 may be dyed.
In other embodiments the larger electrode 40 may be reflective instead of white. In these embodiments, when the particles 50 are moved to the smaller electrode 30, light reflects off the reflective surface 60 associated with the larger electrode 40 and the capsule 20 appears light in color, e.g, white (see FIG. 2A). When the particles 50 are moved to the larger electrode 40, the reflecting surface 60 is obscured and the capsule 20 appears dark (see FIG.
2B) because light is absorbed by the particles 50 before reaching the reflecting surface 60. The reflecting surface 60 for the larger electrode 40 may possess retroreflective properties, specular reflection properties, diffuse reflective properties or gain reflection properties. In certain embodiments, the reflective surface 60 reflects light with a Lambertian distribution. The surface 60 may be provided as a plurality of glass spheres disposed on the electrode 40, a diffractive reflecting layer such as a holographically formed reflector, a surface patterned to totally internally reflect incident light, a brightness-enhancing film, a diffuse reflecting layer, an embossed plastic or metal film, or any other known reflecting surface. The reflecting surface 60 may be provided as a separate layer laminated onto the larger electrode 40 or the reflecting surface 60 may be provided as a unitary part of the larger electrode 40. In the embodiments depicted by FIGs. 2C and 2D, the reflecting surface may be disposed below the electrodes 30, 40 vis-a-vis the viewpoint 10. In these embodiments, electrode 30 should be transparent so that light may be reflected by surface 60. In other embodiments, proper switching of the particles may be accomplished with a combination of alternating-current (AC) and direct-current (DC) electric fields and described below in connection with FIGS. 3A-3D.
In still other embodiments, the rear-addressed display previously discussed can be I5 configured to transition between largely transmissive and largely opaque modes of operation (referred to hereafter as "shutter mode"). Referring back to FIGS. lA and 1B, in these embodiments the capsule 20 contains at least one positively-charged particle 50 dispersed in a substantially clear dispersing fluid 25. The larger electrode 40 is transparent and the smaller electrode 30 is opaque. When the smaller, opaque electrode 30 is placed at a negative voltage potential relative to the larger, transmissive electrode 40, the particles 50 migrate to the smaller, opaque electrode 30. The effect to a viewer of the capsule 20 located at position 10 is a mixture of the larger, transparent electrode 40 and the smaller, opaque electrode 30, creating an effect which is largely transparent. Referring to FIG. 1B, when the smaller, opaque electrode 30 is placed at a positive voltage potential relative to the larger, transparent electrode 40, particles 50 migrate to the second electrode 40 and the viewer is presented a mixture of the opaque particles 50 covering the larger, transparent electrode 40 and the smaller, opaque electrode 30, creating an effect which is largely opaque. In this manner, a display formed using the capsules depicted in FIGs. lA and 1B may be switched between transmissive and opaque modes. Such a display can be used to construct a window that can be rendered opaque. Although FIGS. lA-2D depict a pair of electrodes associated with each capsule 20, it should be understood that each pair of electrodes may be associated with more than one capsule 20.
WO 99/56171 PCT/tJS99/09172 A similar technique may be used in connection with the embodiment of FIGS. 3A, 3B, 3C, and 3D. Referring to FIG. 3A, a capsule 20 contains at least one dark or black particle 50 dispersed in a substantially clear dispersing fluid 25. A smaller, opaque electrode 30 and a larger, transparent electrode 40 apply both direct-current (DC) electric fields and alternating-current (AC) fields to the capsule 20. A DC field can be applied to the capsule 20 to cause the particles 50 to migrate towards the smaller electrode 30. For example, if the particles 50 are positively charged, the smaller electrode is placed a voltage that is more negative than the larger electrode 40. Although FIGS. 3A-3D depict only one capsule per electrode pair, multiple capsules may be addressed using the same electrode pair.
The smaller electrode 30 is at most one-half the size of the larger electrode 40. In preferred embodiments the smaller electrode is one-quarter the size of the larger electrode 40; in more preferred embodiments the smaller electrode 30 is one-eighth the size of the larger electrode 40. In even more preferred embodiments, the smaller electrode 30 is one-sixteenth the size of the larger electrode 40.
Causing the particles 50 to migrate to the smaller electrode 30, as depicted in FIG. 3A, allows incident light to pass through the larger, transparent electrode 40 and be reflected by a reflecting surface 60. In shutter mode, the reflecting surface 60 is replaced by a translucent layer, a transparent layer, or a layer is not provided at all, and incident light is allowed to pass through the capsule 20, i.e. the capsule 20 is transmissive.
Referring now to FIG. 3B, the particles 50 are dispersed into the capsule 20 by applying an AC field to the capsule 20 via the electrodes 30, 40. The particles 50, dispersed into the capsule 20 by the AC field, block incident light from passing through the capsule 20, causing it to appear dark at the viewpoint 10. The embodiment depicted in FIGS. 3A-3B may be used in shutter mode by not providing the reflecting surface 60 and instead providing a translucent layer, a transparent layer, or no layer at all. In shutter mode, application of an AC
electric field causes the capsule 20 to appear opaque. The transparency of a shutter mode display formed by the apparatus depicted in FIGs. 3A-3D may be controlled by the number of capsules addressed using DC fields and AC fields. For example, a display in which every other capsule 20 is addressed using an AC field would appear fifty percent transmissive.
FIGS. 3C and 3D depict an embodiment of the electrode structure described above in which electrodes 30, 40 are on "top" of the capsule 20, that is, the electrodes 30, 40 are between .. v . v v« ~ rt-t~ mvr.:w.tttLtV U l . ~- t~- V ; ~ 02329173 2000-10-18 CC I
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-lb-the viewpoint 10 and the capsule 20. In these embodiments, both electrodes 30, 40 should be transparent. Transparent polymers can be fabricated using conductive polymers, such as polyaniline, polythiophenes, or indium tin o~aide. These materials may be made soluble so that elcctmdes can be fabricated using coating techniques such as spin coating, spray coating, meniscus coating, Printing techniques, forward and reverse roll coating and the like. In these embodiments, light passes through the electrodes 30, 40 and is eithea absorbed by the particles 50, reflected by retmreflccting Layer 60 (when provided), or transmitted throughout the capsule 20 (when retroreflecting layer b0 is not provided).
The addressing structure depicted in Fits. 3A-3D may be used with electrophoretic display media and encapsulated electrophoretic display media. FIGS. 3A-3D
depict embodiments in which electrode 30, 40 are statically attached to the display media. In certain embodiments, the particles SO exhibit bistability, that is, they are substantially motionless in the absence of a electric field. In these embodiments, the electrodes 30, 40 may be provided as part of a "stylus"
or other devirx which is scanned over the material to address each capsule or cluster of capsules.
FIG. 4A depicts a cross-sectional side view of an embodiment of a shutter mode electrophoretic display element 400 in its light-blocking configuration The element comprises a microcapsule 410, which contaia~ a suspending fluid 420 and at least one particle 430. The rnicrocapsule 410 has a first, larger surface 440 and a second, smaller surface 450. The rnicrocapsule is subjected to a first electric field of such an orientation and strength that the particles 430 migrate towards the larger surface 440, substantially blocking light from passing through the microcapsule 410 when the particles 430 are substantially opaque.
For example, if the particles 430 have positive charge, the particles will migrate towards the larger surface 440 when an electric field having an electric vector with a positive gradient extending substantially from the larger surface 440 to the smaller surface 450 is applied, that is, as electric field is applied which has a more negative voltage at the larger surface 440 and a more positive voltage at the smaller surface 450. In this embodiment, the element would appear to a viewer 10 to have the optical property or properties of the particles 430. In another embodiment, the particles 430 may be colored. In this embodiment, the electrophoretic display element 400 exhibit the color of the panicles 430. In another embodiment, the particles 430 are reflective, and the electrophoretic AMENDED SHEET
display element 400 will appear reflective. It will be apparent to those of ordinary skill in the art that the visual appearance of the electrophoretic display element 400 may be varied by selecting the visual appearance of the particles 430 appropriately.
In one embodiment, the electrophoretic display element 400 has a substantially triangular cross section, as depicted in FIG. 4A. An electrophoretic display element 400 having such a cross section may be substantially conical or substantially pyramidal in shape. In another embodiment, the electrophoretic display element 400 may have a substantially trapezoidal cross-section. In yet another embodiment, the electrophoretic display element 400 may have a substantially rectangular cross section. In further embodiments, the electrophoretic display element 400 can have a shape which is not regular, provided that the second surface 450 is smaller than the first surface 440. In yet another embodiment, the electrophoretic display element 400 can have a shape in which the physical sizes of the first surface 440 and the second surface 450 are equal, but the first surface 440 and the second surface 450 are situated in a relatively oblique configuration such that the projected area of the second surface 450 is smaller than the projected area of the first surface 440 when viewed in the intended viewing direction. In different embodiments, the shape of electrophoretic display element 400 can be polygonal when viewed in the intended viewing direction, with 3 to 12 sides. The polygon can be regular, that is, a polygon of N (where N ranges from 3 to 12) sides inscribed within a circle. In other embodiments, the polygon can be a polygon of N (where N ranges from 3 to 12) sides.
FIG. 4B depicts a cross-sectional side view of an embodiment of a shutter mode electrophoretic display element 400 in its light-passing configuration. The element comprises a microcapsule 410, which contains a suspending fluid 420 and at least one particle 430. The microcapsule has a first, larger surface 440 and a second, smaller surface 450. The microcapsule is subjected to a second electric field of such an orientation and strength that the particles 430 migrates towards the smaller surface 450, allowing light to pass through the microcapsule 410 because the particles are concentrated in a vary small area of the microcapsule. The element 410 would appear to a viewer 10 to have the optical property or properties of the suspending fluid 420. In one embodiment, the suspending fluid 420 is clear, and the electrophoretic display element 400 will appear substantially transparent. In another embodiment, the suspending fluid 420 may be dyed or may inherently be colored, and the electrophoretic display element 400 will present to the viewer 10 the color of the fluid 420. In another embodiment, an electrode may be provided behind the electrophoretic display element 400 that is colored, or a substrate may be present having a color. In these embodiments, the electrophoretic display element 400 will present a visual appearance that is a function of both the optical characteristic of the electrode or substrate and the suspending fluid 420.
The second, smaller surface 4S0 may be 90% of the area of the first larger surface 440. In another embodiment the area of the second, smaller surface 4S0 may be 80% of the area of the first larger surface 440. In yet another embodiment the area of the second, smaller surface 4S0 may be 70% of the area of the first larger surface 440. In still another embodiment the area of the second, smaller surface 450 may be 60% of the area of the first larger surface 440. In a further embodiment the area of the second, smaller surface 4S0 may be SO% of the area of the first larger surface 440. In yet a fizrther embodiment the area of the second, smaller surface 4S0 rnay be 2S%
of the area of the first larger surface 440. In a still further embodiment the area of the second, smaller surface 4S0 may be 12.5% of the area of the first larger surface 440.
In another 1 S embodiment the area of the second, smaller surface 450 may be 1/l6th of the area of the first larger surface 440.
FIG. 4C depicts a side view of an embodiment of a plurality of shutter mode electrophoretic display elements, generally 400, which have been arranged as an electrophoretic display 401. The electrophoretic display elements 400 are controlled as described above in connection with FIGS. 4A and 4B. The electrophoretic display 401 can be created by providing a first substrate 480 that forms a number of cavities. In the embodiment depicted in FIG. 4C, each cavity has a triangular cross-section in the substrate, such as a conical depression, a pyramidal depression or a groove having a triangular cross section. In another embodiment the cavities may have rectangular cross sections. A second substrate 490 may be attached to the first substrate to 2S close each of the cavities. Electrodes 495 may be disposed adjacent the substrates to apply an electric field to the display elements 400. In another embodiment, electrodes 496 may be disposed on at least a part of the surface of the first substrate 480 that defines the cavities, so that an electric field can be applied to the display elements 400 in an orientation which is oblique, rather than perpendicular, to the surface of the first substrate 480.
The first substrate 480 can provide cavities having trapezoidal, circular, conic, hemispheric, or rectangular cross-sections. In other embodiments, the first substrate 480 provides cavities having cross-sections that are not geometrically regular.
Alternatively, the first substrate 480 may provide a substantially planar surfaces defining a trough having a triangular cross section. Alternatively, the trough can be substantially straight, curvilinear (such as a spiral), a series of concentric circular troughs, or grooves having substantially parallel sides. As can be appreciated by those of ordinary skill in the art, many different shapes of cavities may be used with success. The cavities may be provided in a regular arrangement, such as a rectangular grid, or the cavities may be irregularly spaced.
In one embodiment, the first substrate 480 is substantially clear. In this embodiment, the electrophoretic display 401 is substantially transparent when the display elements 400 are in the light-passing configuration. The display 401 will have the optical characteristics of the plurality of particles 430 when the display elements 400 are in the light-blocking configuration. Alternatively, the first substrate 480 can be colored. In this embodiment, the electrophoretic display 401 will appear substantially colored when the display elements 400 are in the light passing configuration.
The display 401 will have substantially the optical characteristics of the plurality of particles 430 when the display elements 400 are in the light-blocking configuration. In another embodiment, the suspending fluid 420 can be colored, and the electrophoretic display 401 will have the same color as the suspending fluid 420 when the display elements 400 are in the light passing configuration. The display 401 will have substantially the optical characteristics of the plurality of particles 430 when the display elements 400 are in the light-blocking configuration. The first substrate 480 can be patterned by etching, by micromachining, or by embossing using a suitable embossing die or by other pressure or thermal processes.
FIGS. 5A-5C depict in side view an embodiment of a shutter mode electrophoretic display 500 constructed using a curable polymer. FIG. 5A depicts a shutter mode electrophoretic display 500, containing an assemblage of display elements, generally 510, in side view. Each display element 510 contains at least one particle 530, a suspending fluid 540, and a quantity of an uncured polymer 550. The suspending fluid 540 and the polymer 550 are selected at least in part based on a difference in density, such that there is a tendency to form two separate liquids when the polymer 550 is uncured. Alternatively, the fluids can have a difference in dielectric constant, and be migrated to different regions with electric fields. In alternative embodiments, uncured polymer 550 can be a radiation or thermally cured urethane, urethane/acrylate, silicone, epoxy, or acrylate.
Organic solvents, such as halogenated organic solvents, saturated linear or branched hydrocarbons, silicone oils, and low molecular weight halogen-containing polymers are some useful suspending fluids. The suspending fluid may comprise a single fluid.
The fluid will, however, often be a blend of more than one fluid in order to tune its chemical and physical properties. Furthermore, the fluid may contain surface modifiers to modify the surface energy or charge of the electrophoretic particle or bounding capsule. Reactants or solvents for the microencapsulation process (oil soluble monomers, for example) can also be contained in the suspending fluid. Charge control agents can also be added to the suspending fluid. Useful organic solvents include, but are not limited to, epoxides, such as, for example, decane epoxide and dodecane epoxide; vinyl ethers, such as, for example, cyclohexyl vinyl ether and Decave (International Flavors & Fragrances, Inc., New York, NY); and aromatic hydrocarbons, such as, for example, toluene and naphthalene. Useful halogenated organic solvents include, but are not limited to, tetrafluorodibromoethylene, tetrachloroethylene, trifluorochloroethylene, 1,2,4 trichlorobenzene, carbon tetrachloride. These materials have high densities.
Useful hydrocarbons include, but are not limited to, dodecane, tetradecane, the aliphatic hydrocarbons in the Isopar~' series (Exxon, Houston, TX), Norpar ( series of normal paraffinic liquids), Shell-Sol~ (Shell, Houston, TX), and Sol-Trol~ (Shell), naphtha, and other petroleum solvents.
These materials usually have low densities. Useful examples of silicone oils include, but are not limited to, octamethyl cyclosiloxane and higher molecular weight cyclic siloxanes, poly (methyl phenyl siloxane), hexamethyldisiloxane, and polydimethylsiloxane. These materials usually have low densities. Useful low molecular weight halogen-containing polymers include, but are not limited to, poly(chlorotrifluoroethylene) polymer (Halogenated hydrocarbon Inc., River Edge, NJ), Galden~ (a perfluorinated ether from Ausimont, Morristown, NJ), or KrytoX from Dupont (Wilmington, DE). In a preferred embodiment, the suspending fluid is a poly(chlorotrifluoroethylene) polymer. In a particularly preferred embodiment, this polymer has a degree of polymerization from about 2 to about 10. Many of the above materials are available in a range of viscosities, densities, and boiling points.
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FIG. SB, shows the display 500 tipped at a selected angle, so that the uncurod polymer 550 assumes a position such that it has a free surface (i.e, a surface not in contact with the microeapsule 520) which form an angle with respect to an axis Perpendicular to the display element 510. In the embodiment depicted, the Polymer 550 is more dense than the suspending fluid 540. In another embodiment, the density of the liquid polyzaer 550 is less than that of the suspending fluid 540. and the liquid polymer 5 50 would float on the suspending fluid 540. The polymer 550 is then cured, that is, it is hardened bythc action of light or heat, so that at least its free .;.~rlhCe becomes rigid. Fluorescent light, ultraviolet light, electron beams, or other ra~iiatioa sources may be used to cure the polymer 530. Alternatively, the polymer 530 may be cured by heat. in these embodiments, heat may be applied by microwave, thermal pulse, or heat lamp. It is possible to orient the display 500, cure the polymer 550 in a first capsule 510, reorient the display SGO to another angular position, and cure the polymer 550 coatained in a second capsule 510, in order to create a plurality of elements having cured polymer with different angular orientations in different micmcapsules. FIG. SC depicts a display 500 in which the polymer 550 has been curd to form display elemeats 510 having a first, larger surface 592, and a second, smaller surface 594.
~efeaing now to Fits. 6A and 6B, a capsule 20 of an electronically addressable media is illustrated in which the technique illustrated above is used with multiply rear-addressing electrodes. The capsule 20 contains at least one particle 50 dispersed in a clear suspending fluid 25. The capsule 20 is addressed by multigle smaller electrodes 30 and multiple larger electrodes 40. 1tr these embodiments, the smaller electrodes 30 stwuld be selected to collectively be at most one-half the size of the larger electrodes 40. In further embodiments, the smaller electrodes 30 are collectively one-fourth the size of the larger electrodes 40. In further embodiments the smaller electrodes 30 are collectively one-eighth the size of the larger electrodes 40. In preferred embodiments, the smaller electrodes 30 are collectively one-sixteenth the size of the larger electrodes. Each electrode 30 rnay be provided as separate electrodes that are controDed in parallel to control the display. Far example, each separate electrode may be substantially simultaneously set to the same voltage as all other electrodes of that size.
Alternatively, the electrodes 30, 40 may be interdigitated to provide the embodiment shown in FIGs. 6A and 68.
Operation of the rear-addressing electrode structure depicted in FIGS. 6A and 6B is similar to that described above. For example, the capsule 20 may contain positively charged, black pa~~ticles 50 dispersed in a substantially clear suspending fluid 25.
The smaller electrodes AMENDED SHEET
are colored black and the larger electrodes 40 are colored white or are highly reflective.
Referring to FIG. 6A, the smaller electrodes 30 are placed at a negative potential relative to the larger electrodes 40, causing particles 50 migrate within the capsule to the smaller electrodes 30 and the capsule 20 appears to the viewpoint 10 as a mix of the larger, white electrodes 40 and the smaller, black electrodes 30, creating an effect which is largely white.
Referring to Fig. 6B, when the smaller electrodes 30 are placed at a positive potential relative to the larger electrodes 40, particles 50 migrate to the larger electrodes 40 causing the capsule 20 to display a mix of the larger, white electrodes 40 occluded by the black particles SO and the smaller, black electrodes 30, creating an effect which is largely black. The techniques described above with respect to the embodiments depicted in FIGs. lA and 1B for producing two-color displays work with equal effectiveness in connection with these embodiments.
FIGs. 7A and 7B depict an embodiment of a rear-addressing electrode structure that creates a reflective color display in a manner similar to halftoning or pointillism. The capsule 20 contains white particles 55 dispersed in a clear suspending fluid 25.
Electrodes 42, 44, 46, 48 are colored cyan, magenta, yellow, and white respectively. Referring to FIG 7A, when the colored electrodes 42, 44, 46 are placed at a positive potential relative to the white electrode 48, negatively-charged particles 55 migrate to these three electrodes, causing the capsule 20 to present to the viewpoint 10 a mix of the white particles 55 and the white electrode 48, creating an effect which is largely white. Referring to FIG. 7B, when electrodes 42, 44, 46 are placed at a negative potential relative to electrode 48, particles 55 migrate to the white electrode 48, and the eye 10 sees a mix of the white particles 55, the cyan electrode 42, the magenta electrode 44, and the yellow electrode 46, creating an effect which is largely black or gray. By addressing the electrodes, any color can be produced that is possible with a subtractive color process. For example, to cause the capsule 20 to display an orange color to the viewpoint 10, the yellow electrode 46 and the magenta electrode 42 are set to a voltage potential that is more positive than the voltage potential applied by the cyan electrode 42 and the white electrode 48. Further, the relative intensities of these colors can be controlled by the actual voltage potentials applied to the electrodes. In another embodiment, the particles SS can be reflective or absorbing. In yet another embodiment, electrodes 42, 44, 46, 48 can be red, green, blue and white, respectively. In yet another embodiment, the particles 55 can be black and electrode 48 can be black.
In another embodiment, depicted in FIG. 8, a color display is provided by a capsule 20 of size d containing multiple species of particles in a clear, dispersing fluid 25. Each species of particles has different optical properties and possess different electrophoretic mobilities (~) from the other species. In the embodiment depicted in FIG. 8, the capsule 20 contains red particles 52, S blue particles 54, and green particles 56, and IN.I lu.l ~ IN I
That is, the magnitude of the electrophoretic mobility of the red particles 52, on average, exceeds the electrophoretic mobility of the blue particles 54, on average, and the electrophoretic mobility of the blue particles 54, on average, exceeds the average electrophoretic mobility of the green particles 56. As an example, there may be a species of red particle with a zeta potential of 100 millivolts (mV), a blue particle with a zeta potential of 60 mV, and a green particle with a zeta potential of 20 mV. The capsule 20 is placed between two electrodes 32, 42 that apply an electric field to the capsule.
FIGs. 9A-9B depict the steps to be taken to address the display shown in FIG.
8 to display a red color to a viewpoint 10. Referring to FIG. 9A, all the particles 52, 54, 56 are attracted to one side of the capsule 20 by applying an electric field in one direction. The electric field should be applied to the capsule 20 long enough to attract even the more slowly moving green particles 56 to the electrode 34. Referring to FIG. 9B, the electric field is reversed just long enough to allow the red particles 52 to migrate towards the electrode 32. The blue particles 54 and green particles 56 will also move in the reversed electric field, but they will not move as fast as the red particles 52 and thus will be obscured by the red particles 52. The amount of time for which the applied electric field must be reversed can be determined from the relative electrophoretic mobilities of the particles, the strength of the applied electric field, and the size of the capsule.
FIGS. l0A-lOD depict addressing the display element to a blue state. As shown in FIG.
10A, the particles 52, 54, 56 are initially randomly dispersed in the capsule 20. All the particles 52, 54, 56 are attracted to one side of the capsule 20 by applying an electric field in one direction (shown in FIG. lOB). Referring to FIG. l OC, the electric field is reversed just long enough to allow the red particles 52 and blue particles 54 to migrate towards the electrode 32. The amount of time for which the applied electric field must be reversed can be determined from the relative .. __._ ..__.._.~... ... . u- v- t~ 02329173 2000-10-18 CCIT'1~ ~~4~-i +q-9 R4 ~z:~4su.4a~:~1~
79-05-2000 . PCT/U S99/09172 ._____-_~ ivW aW.. fatal-tfTVt ~r electrophoretic mobilities of the particles, the strength of the applied electric field, and the size of the capsule. Referring to FI~Cr. l OD, the elec4ric field is then reversed a second time and the red particles 52, mo'zag faster than the blue particles 54, leave the bhie particles 54 exposai to the viewpoint 10. The amount of time for which the applied electric field must be reversed can be detemlined from the relative electrophoretic mobilities of the particles, the strength of the applied electric field, and the size of the capsule.
FIGS. 1 lA-11C depict the sups to be taken to present a green display to the viewpoint 10.
As shown in FIG. 11A, the particles 52, 54, 56 ate initially distributed randomly in the capsule 20. All the particles 52, 54, S6 are attracted to the side of the capsule 20 proximal the viewpoint 10 by applying as electric field in one direction. 'The electric field should be applied to the capsule 20 long enough to attract even the more slowly moving green particles 56 to the electrode 32. As shown in FIG. 11 C, the electric field is reversed~ust long enough to allow the red particles 52 and the blue particles 54 to migrate towards the electrode 54, leaving the slowly-moving green particles 56 displayed to the viewpoint. The amount of time for which the applied electric field must be reversed can be determined from the relative electrophoretic mobilities of the particles, the strength of the applied electric field, and the size of the capsule.
in other embodiments, the capsule contains multiple species of particles and a dyed dispersing fluid that acts as one of the colors. In still other embodiments, more than three species of particles may be provided having additional colors. Although FIGS. 8-11C
depict two electrodes associated with a single capsule, the electrodes may address multiple capsules or less than a full capsule While the invention has been particularly shown and described with reference to specific preferred embodiments, it should be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
AMENDED SHEET
In yet another aspect, the invention relates to a method of manufacturing an electrophoretic display comprising the steps of manufacturing a plurality of display elements.
Each display element is manufactured by encapsulating a suspending fluid having a first optical property, at least one particle having a second optical property different from said first optical property, and a structural material. A substrate defines a plurality of cavities and each cavity is adapted to receive a display element. At least one display element is situated within at least one of the cavities defined by the substrate. The substrate is oriented in a predetermined orientation and the structural material is treated to form a display portion within each capsule. The display portion has a first, larger surface and a second smaller surface. The invention also features the steps of providing electrodes adapted to address each display element individually, and providing a substrate which has depressions that define conical cavities, pyramidal cavities, or grooves.
In another aspect, the invention relates to an encapsulated electrophoretic display element which includes a capsule having a first surface and a second surface, wherein the first surface and the second surface comprise different projected areas when viewed in the intended viewing direction. The capsule contains a suspending fluid and at least one particle.
When a first electrical field is applied to the capsule, at least some of the particles migrate toward the first surface. When a second electrical field is applied to the capsule, at least some of the particles migrate towards the second surface.
Brief Description of the Drawings The invention is pointed out with particularity in the appended claims. The advantages of the invention described above, together with further advantages, may be better understood by referring to the following description taken in conjunction with the accompanying drawings. In the drawings, like reference characters generally refer to the same parts throughout the different views. Also, the drawings are not necessarily to scale, emphasis instead generally being placed upon illustrating the principles of the invention.
FIG. lA is a diagrammatic side view of an embodiment of a rear-addressing electrode structure for a particle-based display in which the smaller electrode has been placed at a voltage relative to the large electrode causing the particles to migrate to the smaller electrode.
FIG. 1B is a diagrammatic side view of an embodiment of a rear-addressing electrode structure for a particle-based display in which the larger electrode has been placed at a voltage relative to the smaller electrode causing the particles to migrate to the larger electrode.
FIG. 1 C is a diagrammatic top-down view of one embodiment of a rear-addressing electrode structure.
FIG. 2A is a diagrammatic side view of an embodiment of a rear-addressing electrode structure having a retroreflective layer associated with the larger electrode in which the smaller electrode has been placed at a voltage relative to the large electrode causing the particles to migrate to the smaller electrode.
FIG. 2B is a diagrammatic side view of an embodiment of a rear-addressing electrode structure having a retroreflective layer associated with the larger electrode in which the larger electrode has been placed at a voltage relative to the smaller electrode causing the particles to migrate to the larger electrode.
FIG. 2C is a diagrammatic side view of an embodiment of a rear-addressing electrode structure having a retroreflective layer disposed below the larger electrode in which the smaller electrode has been placed at a voltage relative to the large electrode causing the particles to migrate to the smaller electrode.
FIG. 2D is a diagrammatic side view of an embodiment of a rear-addressing electrode structure having a retroreflective layer disposed below the larger electrode in which the larger electrode has been placed at a voltage relative to the smaller electrode causing the particles to migrate to the larger electrode.
FIG. 3A is a diagrammatic side view of an embodiment of an addressing structure in which a direct-current electric field has been applied to the capsule causing the particles to migrate to the smaller electrode.
_g_ FIG. 3B is a diagrammatic side view of an embodiment of an addressing structure in~which an alternating-current electric field has been applied to the capsule causing the particles to disperse into the capsule.
FIG. 3 C is a diagrammatic side view of an embodiment of an addressing structure having transparent electrodes, in which a direct-current electric field has been applied to the capsule causing the particles to migrate to the smaller electrode.
FIG. 3D is a diagrammatic side view of an embodiment of an addressing structure having transparent electrodes, in which an alternating-current electric field has been applied to the capsule causing the particles to disperse into the capsule.
FIG. 4A is a diagrammatic cross-sectional view of a shutter mode display element in a light-blocking configuration.
FIG. 4B is a diagrammatic cross-sectional view of a shutter mode display element in a light-passing configuration.
FIG. 4C is a diagrammatic side view of a display formed of multiple shutter mode display elements.
FIG. 5A is a diagrammatic cross-sectional view of a display formed of multiple shutter mode display elements containing a suspending fluid, at least one particle, and a structural material.
FIG. 5B is a diagrammatic cross-sectional view of the display of FIG. SA
oriented at a predetermined angle.
FIG. 5C is a diagrammatic cross-sectional view of the display of FIG. 5A after the structural material has been cured.
FIG. 6A is a diagrammatic side view of an embodiment of a rear-addressing electrode structure for a particle-based display in which multiple smaller electrodes have been placed at a voltage relative to multiple larger electrodes, causing the particles to migrate to the smaller electrodes.
FIG. 6B is a diagrammatic side view of an embodiment of a rear-addressing electrode structure for a particle-based display in which multiple larger electrodes have been placed at a voltage relative to multiple smaller electrodes, causing the particles to migrate to the larger electrodes.
FIG. 7A is a diagrammatic side view of an embodiment of a rear-addressing electrode structure for a particle-based display having colored electrodes and a white electrode, in which the colored electrodes have been placed at a voltage relative to the white electrode causing the particles to migrate to the colored electrodes.
FIG. 7B is a diagrammatic side view of an embodiment of a rear-addressing electrode structure for a particle-based display having colored electrodes and a white electrode, in which the white electrode has been placed at a voltage relative to the colored electrodes causing the particles to migrate to the white electrode.
FIG. 8 is a diagrammatic side view of an embodiment of a color display element having red, green, and blue particles of different electrophoretic mobilities.
FIGs. 9A-9B depict the steps taken to address the display of FIG. 6 to display red.
FIGs. l0A-l OD depict the steps taken to address the display of FIG. 8 to display blue.
FIGS. 11A-11C depict the steps taken to address the display of FIG. 8 to display green.
Detailed Description of the Invention An electronic ink is an optoelectronically active material which comprises at least two phases: an electrophoretic contrast media phase and a coating/binding phase.
The electrophoretic phase comprises, in some embodiments, a single species of electrophoretic particles dispersed in a clear or dyed medium, or more than one species of electrophoretic particles having distinct physical and electrical characteristics dispersed in a clear or dyed medium.
In some embodiments the electrophoretic phase is encapsulated, that is, there is a capsule wall phase between the two phases. The coating/binding phase includes, in one embodiment, a polymer matrix that surrounds the electrophoretic phase. In this embodiment, the polymer in the polymeric binder is capable of being dried, crosslinked, or otherwise cured as in traditional inks, and therefore a printing process can be used to deposit the electronic ink onto a substrate. An electronic ink is capable of being printed by several different processes, depending on the mechanical properties of the specific ink employed. For example, the fragility or viscosity of a particular ink may result in a different process selection. A very viscous ink would not be well-suited to deposition by an inkjet printing process, while a fragile ink might not be used in a knife over roll coating process.
The optical quality of an electronic ink is quite distinct from other electronic display materials. The most notable difference is that the electronic ink provides a high degree of both reflectance and contrast because it is pigment based (as are ordinary printing inks). The light scattered from the electronic ink comes from a very thin layer of pigment close to the top of the viewing surface. In this respect it resembles an ordinary, printed image.
Also, electronic ink is easily viewed from a wide range of viewing angles in the same manner as a printed page, and such ink approximates a Lambertian contrast curve more closely than any other electronic display material. Since electronic ink can be printed, it can be included on the same surface with any other printed material, including traditional inks. Electronic ink can be made optically stable in all display configurations, that is, the ink can be set to a persistent optical state. Fabrication of a display by printing an electronic ink is particularly useful in low power applications because of this stability.
Electronic ink displays are novel in that they can be addressed by DC voltages and draw very little current. As such, the conductive leads and electrodes used to deliver the voltage to electronic ink displays can be of relatively high resistivity. The ability to use resistive conductors substantially widens the number and type of materials that can be used as conductors in electronic ink displays. In particular, the use of costly vacuum-sputtered indium tin oxide (ITO) conductors, 1 S a standard material in liquid crystal devices, is not required. Aside from cost savings, the replacement of ITO with other materials can provide benefits in appearance, processing capabilities (printed conductors), flexibility, and durability. Additionally, the printed electrodes are in contact only with a solid binder, not with a fluid layer (like liquid crystals). This means that some conductive materials, which would otherwise dissolve or be degraded by contact with liquid crystals, can be used in an electronic ink application. These include opaque metallic inks for the rear electrode (e.g., silver and graphite inks), as well as conductive transparent inks for either substrate. These conductive coatings include semiconducting colloids, examples of which are indium tin oxide and antimony-doped tin oxide. Organic conductors (polymeric conductors and molecular organic conductors) also may be used. Polymers include, but are not limited to, polyaniline and derivatives, polythiophene and derivatives, poly3,4-ethylenedioxythiophene (PEDOT) and derivatives, polypyrrole and derivatives, and polyphenylenevinylene (PPV) and derivatives. Organic molecular conductors include, but are not limited to, derivatives of naphthalene, phthalocyanine, and pentacene. Polymer layers can be made thinner and more transparent than with traditional displays because conductivity requirements are not as stringent.
WO 99/5b171 PCT/US99109172 As an example, there are a class of materials called electroconductive powders which are also useful as coatable transparent conductors in electronic ink displays. One example is Zelec ECP electroconductive powders from DuPont Chemical Co. of Wilmington, Delaware.
Referring now to FIGS. 1 A and 1 B, an addressing scheme fox controlling particle-based S displays is shown in which electrodes are disposed on only one side of a display, allowing the display to be rear-addressed. Utilizing only one side of the display for electrodes simplifies fabrication of displays. For example, if the electrodes are disposed on only the rear side of a display, both of the electrodes can be fabricated using opaque materials, because the electrodes do not need to be transparent.
FIG. 1 A depicts a single capsule 20 of an encapsulated display media. In brief overview, the embodiment depicted in FIG. 1 A includes a capsule 20 containing at least one particle 50 dispersed in a suspending fluid 25. The capsule 20 is addressed by a first electrode 30 and a second electrode 40. The first electrode 30 is smaller than the second electrode 40. The first electrode 30 and the second electrode 40 may be set to voltage potentials which affect the position of the particles 50 in the capsule 20.
The particles 50 represent 0.1 % to 20% of the volume enclosed by the capsule 20. In some embodiments the particles SO represent 2.5% to 17.5% of the volume enclosed by capsule 20. In preferred embodiments, the particles 50 represent 5% to 15% of the volume enclosed by the capsule 20. In more preferred embodiments the particles 50 represent 9% to 11% ofthe volume defined by the capsule 20. In general, the volume percentage of the capsule 20 that the particles SO represent should be selected so that the particles 50 expose most of the second, larger electrode 40 when positioned over the first, smaller electrode 30. As described in detail below, the particles 50 may be colored any one of a number of colors. The particles 50 may be either positively charged or negatively charged.
The particles 50 are dispersed in a dispersing fluid 25. The dispersing fluid 25 should have a low dielectric constant. The fluid 25 may be clear, or substantially clear, so that the fluid 25 does not inhibit viewing the particles 50 and the electrodes 30, 40 from position 10. In other embodiments, the fluid 25 is dyed. In some embodiments the dispersing fluid 25 has a specific gravity matched to the density of the particles 50. These embodiments can provide a bistable display media, because the particles SO do not tend to move in certain compositions absent an electric field applied via the electrodes 30, 40.
WO 99/56171 PCT/t1S99/09172 The electrodes 30, 40 should be sized and positioned appropriately so that together they address the entire capsule 20, There may be exactly one pair of electrodes 30, 40 per capsule 20, multiple pairs of electrodes 30, 40 per capsule 20, or a single pair of electrodes 30, 40 may span multiple capsules 20. In the embodiment shown in FIGs. lA and 1B, the capsule 20 has a flattened, rectangular shape. In these embodiments, the electrodes 30, 40 should address most, or all, of the flattened surface area adjacent the electrodes 30, 40. The smaller electrode 30 is at most one-half the size of the larger electrode 40. In preferred embodiments the smaller electrode is one-quarter the size of the larger electrode 40; in more preferred embodiments the smaller electrode 30 is one-eighth the size of the larger electrode 40. In even more preferred embodiments, the smaller electrode 30 is one-sixteenth the size of the larger electrode 40. It should be noted that reference to "smaller" in connection with the electrode 30 means that the electrode 30 addresses a smaller amount of the surface area of the capsule 20, not necessarily that the electrode 30 is physically smaller than the larger electrode 40. For example, multiple capsules may be positioned such that less of each capsule 20 is addressed by the "smaller" electrode 30, 15 even though both electrodes 30, 40 are equal in size. It should also be noted that, as shown in FIG. 1C, electrode 30 may address only a small corner of a rectangular capsule 20 (shown in phantom view in FIG. 1C), requiring the larger electrode 40 to surround the smaller electrode 30 on two sides in order to properly address the capsule 20. Selection of the percentage volume of the particles SO and the electrodes 30, 40 in this manner allow the encapsulated display media to 20 be addressed as described below.
Electrodes may be fabricated from any material capable of conducting electricity so that electrode 30, 40 may apply an electric field to the capsule 20. As noted above, the rear-addressed embodiments depicted in FIGS. lA and 1B allow the electrodes 30, 40 to be fabricated from opaque materials such as solder paste, copper, copper-clad polyimide, graphite inks, silver inks and other metal-containing conductive inks. Alternatively, electrodes may be fabricated using transparent materials such as indium tin oxide and conductive polymers such as polyaniline or polythiopenes. Electrodes 30, 40 may be provided with contrasting optical properties. In some embodiments, one of the electrodes has an optical property complementary to optical properties of the particles S0.
In one embodiment, the capsule 20 contains positively charged black particles 50, and a substantially clear suspending fluid 25. The first, smaller electrode 30 is colored black, and is smaller than the second electrode 40, which is colored white or is highly reflective. When the smaller, black electrode 30 is placed at a negative voltage potential relative to larger, white electrode 40, the positively-charged particles SO migrate to the smaller, black electrode 30. The effect to a viewer of the capsule 20 located at position 10 is a mixture of the larger, white electrode 40 and the smaller, black electrode 30, creating an effect which is largely white.
Referring to FIG. 1B, when the smaller, black electrode 30 is placed at a positive voltage potential relative to the larger, white electrode 40, particles SO migrate to the larger, white electrode 40 and the viewer is presented a mixture of the black particles 50 covering the larger, white electrode 40 and the smaller, black electrode 30, creating an effect which is largely black.
In this manner the capsule 20 may be addressed to display either a white visual state or a black visual state.
Other two-color schemes are easily provided by varying the color of the smaller electrode 30 and the particles 50 or by varying the color of the larger electrode 40.
For example, varying the color of the larger electrode 40 allows fabrication of a rear-addressed, two-color display having black as one of the colors. Alternatively, varying the color of the smaller electrode 30 and the particles 50 allow a rear-addressed two-color system to be fabricated having white as one of the colors. Further, it is contemplated that the particles 50 and the smaller electrode 30 can be different colors. In these embodiments, a two-color display may be fabricated having a second color that is different from the color of the smaller electrode 30 and the particles S0. For example, a rear-addressed, orange-white display may be fabricated by providing blue particles 50, a red, smaller electrode 30, and a white (or highly reflective) larger electrode 40. In general, the optical properties of the electrodes 30, 40 and the particles 50 can be independently selected to provide desired display characteristics. In some embodiments the optical properties of the dispersing fluid 25 may also be varied, e.g. the fluid 25 may be dyed.
In other embodiments the larger electrode 40 may be reflective instead of white. In these embodiments, when the particles 50 are moved to the smaller electrode 30, light reflects off the reflective surface 60 associated with the larger electrode 40 and the capsule 20 appears light in color, e.g, white (see FIG. 2A). When the particles 50 are moved to the larger electrode 40, the reflecting surface 60 is obscured and the capsule 20 appears dark (see FIG.
2B) because light is absorbed by the particles 50 before reaching the reflecting surface 60. The reflecting surface 60 for the larger electrode 40 may possess retroreflective properties, specular reflection properties, diffuse reflective properties or gain reflection properties. In certain embodiments, the reflective surface 60 reflects light with a Lambertian distribution. The surface 60 may be provided as a plurality of glass spheres disposed on the electrode 40, a diffractive reflecting layer such as a holographically formed reflector, a surface patterned to totally internally reflect incident light, a brightness-enhancing film, a diffuse reflecting layer, an embossed plastic or metal film, or any other known reflecting surface. The reflecting surface 60 may be provided as a separate layer laminated onto the larger electrode 40 or the reflecting surface 60 may be provided as a unitary part of the larger electrode 40. In the embodiments depicted by FIGs. 2C and 2D, the reflecting surface may be disposed below the electrodes 30, 40 vis-a-vis the viewpoint 10. In these embodiments, electrode 30 should be transparent so that light may be reflected by surface 60. In other embodiments, proper switching of the particles may be accomplished with a combination of alternating-current (AC) and direct-current (DC) electric fields and described below in connection with FIGS. 3A-3D.
In still other embodiments, the rear-addressed display previously discussed can be I5 configured to transition between largely transmissive and largely opaque modes of operation (referred to hereafter as "shutter mode"). Referring back to FIGS. lA and 1B, in these embodiments the capsule 20 contains at least one positively-charged particle 50 dispersed in a substantially clear dispersing fluid 25. The larger electrode 40 is transparent and the smaller electrode 30 is opaque. When the smaller, opaque electrode 30 is placed at a negative voltage potential relative to the larger, transmissive electrode 40, the particles 50 migrate to the smaller, opaque electrode 30. The effect to a viewer of the capsule 20 located at position 10 is a mixture of the larger, transparent electrode 40 and the smaller, opaque electrode 30, creating an effect which is largely transparent. Referring to FIG. 1B, when the smaller, opaque electrode 30 is placed at a positive voltage potential relative to the larger, transparent electrode 40, particles 50 migrate to the second electrode 40 and the viewer is presented a mixture of the opaque particles 50 covering the larger, transparent electrode 40 and the smaller, opaque electrode 30, creating an effect which is largely opaque. In this manner, a display formed using the capsules depicted in FIGs. lA and 1B may be switched between transmissive and opaque modes. Such a display can be used to construct a window that can be rendered opaque. Although FIGS. lA-2D depict a pair of electrodes associated with each capsule 20, it should be understood that each pair of electrodes may be associated with more than one capsule 20.
WO 99/56171 PCT/tJS99/09172 A similar technique may be used in connection with the embodiment of FIGS. 3A, 3B, 3C, and 3D. Referring to FIG. 3A, a capsule 20 contains at least one dark or black particle 50 dispersed in a substantially clear dispersing fluid 25. A smaller, opaque electrode 30 and a larger, transparent electrode 40 apply both direct-current (DC) electric fields and alternating-current (AC) fields to the capsule 20. A DC field can be applied to the capsule 20 to cause the particles 50 to migrate towards the smaller electrode 30. For example, if the particles 50 are positively charged, the smaller electrode is placed a voltage that is more negative than the larger electrode 40. Although FIGS. 3A-3D depict only one capsule per electrode pair, multiple capsules may be addressed using the same electrode pair.
The smaller electrode 30 is at most one-half the size of the larger electrode 40. In preferred embodiments the smaller electrode is one-quarter the size of the larger electrode 40; in more preferred embodiments the smaller electrode 30 is one-eighth the size of the larger electrode 40. In even more preferred embodiments, the smaller electrode 30 is one-sixteenth the size of the larger electrode 40.
Causing the particles 50 to migrate to the smaller electrode 30, as depicted in FIG. 3A, allows incident light to pass through the larger, transparent electrode 40 and be reflected by a reflecting surface 60. In shutter mode, the reflecting surface 60 is replaced by a translucent layer, a transparent layer, or a layer is not provided at all, and incident light is allowed to pass through the capsule 20, i.e. the capsule 20 is transmissive.
Referring now to FIG. 3B, the particles 50 are dispersed into the capsule 20 by applying an AC field to the capsule 20 via the electrodes 30, 40. The particles 50, dispersed into the capsule 20 by the AC field, block incident light from passing through the capsule 20, causing it to appear dark at the viewpoint 10. The embodiment depicted in FIGS. 3A-3B may be used in shutter mode by not providing the reflecting surface 60 and instead providing a translucent layer, a transparent layer, or no layer at all. In shutter mode, application of an AC
electric field causes the capsule 20 to appear opaque. The transparency of a shutter mode display formed by the apparatus depicted in FIGs. 3A-3D may be controlled by the number of capsules addressed using DC fields and AC fields. For example, a display in which every other capsule 20 is addressed using an AC field would appear fifty percent transmissive.
FIGS. 3C and 3D depict an embodiment of the electrode structure described above in which electrodes 30, 40 are on "top" of the capsule 20, that is, the electrodes 30, 40 are between .. v . v v« ~ rt-t~ mvr.:w.tttLtV U l . ~- t~- V ; ~ 02329173 2000-10-18 CC I
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-lb-the viewpoint 10 and the capsule 20. In these embodiments, both electrodes 30, 40 should be transparent. Transparent polymers can be fabricated using conductive polymers, such as polyaniline, polythiophenes, or indium tin o~aide. These materials may be made soluble so that elcctmdes can be fabricated using coating techniques such as spin coating, spray coating, meniscus coating, Printing techniques, forward and reverse roll coating and the like. In these embodiments, light passes through the electrodes 30, 40 and is eithea absorbed by the particles 50, reflected by retmreflccting Layer 60 (when provided), or transmitted throughout the capsule 20 (when retroreflecting layer b0 is not provided).
The addressing structure depicted in Fits. 3A-3D may be used with electrophoretic display media and encapsulated electrophoretic display media. FIGS. 3A-3D
depict embodiments in which electrode 30, 40 are statically attached to the display media. In certain embodiments, the particles SO exhibit bistability, that is, they are substantially motionless in the absence of a electric field. In these embodiments, the electrodes 30, 40 may be provided as part of a "stylus"
or other devirx which is scanned over the material to address each capsule or cluster of capsules.
FIG. 4A depicts a cross-sectional side view of an embodiment of a shutter mode electrophoretic display element 400 in its light-blocking configuration The element comprises a microcapsule 410, which contaia~ a suspending fluid 420 and at least one particle 430. The rnicrocapsule 410 has a first, larger surface 440 and a second, smaller surface 450. The rnicrocapsule is subjected to a first electric field of such an orientation and strength that the particles 430 migrate towards the larger surface 440, substantially blocking light from passing through the microcapsule 410 when the particles 430 are substantially opaque.
For example, if the particles 430 have positive charge, the particles will migrate towards the larger surface 440 when an electric field having an electric vector with a positive gradient extending substantially from the larger surface 440 to the smaller surface 450 is applied, that is, as electric field is applied which has a more negative voltage at the larger surface 440 and a more positive voltage at the smaller surface 450. In this embodiment, the element would appear to a viewer 10 to have the optical property or properties of the particles 430. In another embodiment, the particles 430 may be colored. In this embodiment, the electrophoretic display element 400 exhibit the color of the panicles 430. In another embodiment, the particles 430 are reflective, and the electrophoretic AMENDED SHEET
display element 400 will appear reflective. It will be apparent to those of ordinary skill in the art that the visual appearance of the electrophoretic display element 400 may be varied by selecting the visual appearance of the particles 430 appropriately.
In one embodiment, the electrophoretic display element 400 has a substantially triangular cross section, as depicted in FIG. 4A. An electrophoretic display element 400 having such a cross section may be substantially conical or substantially pyramidal in shape. In another embodiment, the electrophoretic display element 400 may have a substantially trapezoidal cross-section. In yet another embodiment, the electrophoretic display element 400 may have a substantially rectangular cross section. In further embodiments, the electrophoretic display element 400 can have a shape which is not regular, provided that the second surface 450 is smaller than the first surface 440. In yet another embodiment, the electrophoretic display element 400 can have a shape in which the physical sizes of the first surface 440 and the second surface 450 are equal, but the first surface 440 and the second surface 450 are situated in a relatively oblique configuration such that the projected area of the second surface 450 is smaller than the projected area of the first surface 440 when viewed in the intended viewing direction. In different embodiments, the shape of electrophoretic display element 400 can be polygonal when viewed in the intended viewing direction, with 3 to 12 sides. The polygon can be regular, that is, a polygon of N (where N ranges from 3 to 12) sides inscribed within a circle. In other embodiments, the polygon can be a polygon of N (where N ranges from 3 to 12) sides.
FIG. 4B depicts a cross-sectional side view of an embodiment of a shutter mode electrophoretic display element 400 in its light-passing configuration. The element comprises a microcapsule 410, which contains a suspending fluid 420 and at least one particle 430. The microcapsule has a first, larger surface 440 and a second, smaller surface 450. The microcapsule is subjected to a second electric field of such an orientation and strength that the particles 430 migrates towards the smaller surface 450, allowing light to pass through the microcapsule 410 because the particles are concentrated in a vary small area of the microcapsule. The element 410 would appear to a viewer 10 to have the optical property or properties of the suspending fluid 420. In one embodiment, the suspending fluid 420 is clear, and the electrophoretic display element 400 will appear substantially transparent. In another embodiment, the suspending fluid 420 may be dyed or may inherently be colored, and the electrophoretic display element 400 will present to the viewer 10 the color of the fluid 420. In another embodiment, an electrode may be provided behind the electrophoretic display element 400 that is colored, or a substrate may be present having a color. In these embodiments, the electrophoretic display element 400 will present a visual appearance that is a function of both the optical characteristic of the electrode or substrate and the suspending fluid 420.
The second, smaller surface 4S0 may be 90% of the area of the first larger surface 440. In another embodiment the area of the second, smaller surface 4S0 may be 80% of the area of the first larger surface 440. In yet another embodiment the area of the second, smaller surface 4S0 may be 70% of the area of the first larger surface 440. In still another embodiment the area of the second, smaller surface 450 may be 60% of the area of the first larger surface 440. In a further embodiment the area of the second, smaller surface 4S0 may be SO% of the area of the first larger surface 440. In yet a fizrther embodiment the area of the second, smaller surface 4S0 rnay be 2S%
of the area of the first larger surface 440. In a still further embodiment the area of the second, smaller surface 4S0 may be 12.5% of the area of the first larger surface 440.
In another 1 S embodiment the area of the second, smaller surface 450 may be 1/l6th of the area of the first larger surface 440.
FIG. 4C depicts a side view of an embodiment of a plurality of shutter mode electrophoretic display elements, generally 400, which have been arranged as an electrophoretic display 401. The electrophoretic display elements 400 are controlled as described above in connection with FIGS. 4A and 4B. The electrophoretic display 401 can be created by providing a first substrate 480 that forms a number of cavities. In the embodiment depicted in FIG. 4C, each cavity has a triangular cross-section in the substrate, such as a conical depression, a pyramidal depression or a groove having a triangular cross section. In another embodiment the cavities may have rectangular cross sections. A second substrate 490 may be attached to the first substrate to 2S close each of the cavities. Electrodes 495 may be disposed adjacent the substrates to apply an electric field to the display elements 400. In another embodiment, electrodes 496 may be disposed on at least a part of the surface of the first substrate 480 that defines the cavities, so that an electric field can be applied to the display elements 400 in an orientation which is oblique, rather than perpendicular, to the surface of the first substrate 480.
The first substrate 480 can provide cavities having trapezoidal, circular, conic, hemispheric, or rectangular cross-sections. In other embodiments, the first substrate 480 provides cavities having cross-sections that are not geometrically regular.
Alternatively, the first substrate 480 may provide a substantially planar surfaces defining a trough having a triangular cross section. Alternatively, the trough can be substantially straight, curvilinear (such as a spiral), a series of concentric circular troughs, or grooves having substantially parallel sides. As can be appreciated by those of ordinary skill in the art, many different shapes of cavities may be used with success. The cavities may be provided in a regular arrangement, such as a rectangular grid, or the cavities may be irregularly spaced.
In one embodiment, the first substrate 480 is substantially clear. In this embodiment, the electrophoretic display 401 is substantially transparent when the display elements 400 are in the light-passing configuration. The display 401 will have the optical characteristics of the plurality of particles 430 when the display elements 400 are in the light-blocking configuration. Alternatively, the first substrate 480 can be colored. In this embodiment, the electrophoretic display 401 will appear substantially colored when the display elements 400 are in the light passing configuration.
The display 401 will have substantially the optical characteristics of the plurality of particles 430 when the display elements 400 are in the light-blocking configuration. In another embodiment, the suspending fluid 420 can be colored, and the electrophoretic display 401 will have the same color as the suspending fluid 420 when the display elements 400 are in the light passing configuration. The display 401 will have substantially the optical characteristics of the plurality of particles 430 when the display elements 400 are in the light-blocking configuration. The first substrate 480 can be patterned by etching, by micromachining, or by embossing using a suitable embossing die or by other pressure or thermal processes.
FIGS. 5A-5C depict in side view an embodiment of a shutter mode electrophoretic display 500 constructed using a curable polymer. FIG. 5A depicts a shutter mode electrophoretic display 500, containing an assemblage of display elements, generally 510, in side view. Each display element 510 contains at least one particle 530, a suspending fluid 540, and a quantity of an uncured polymer 550. The suspending fluid 540 and the polymer 550 are selected at least in part based on a difference in density, such that there is a tendency to form two separate liquids when the polymer 550 is uncured. Alternatively, the fluids can have a difference in dielectric constant, and be migrated to different regions with electric fields. In alternative embodiments, uncured polymer 550 can be a radiation or thermally cured urethane, urethane/acrylate, silicone, epoxy, or acrylate.
Organic solvents, such as halogenated organic solvents, saturated linear or branched hydrocarbons, silicone oils, and low molecular weight halogen-containing polymers are some useful suspending fluids. The suspending fluid may comprise a single fluid.
The fluid will, however, often be a blend of more than one fluid in order to tune its chemical and physical properties. Furthermore, the fluid may contain surface modifiers to modify the surface energy or charge of the electrophoretic particle or bounding capsule. Reactants or solvents for the microencapsulation process (oil soluble monomers, for example) can also be contained in the suspending fluid. Charge control agents can also be added to the suspending fluid. Useful organic solvents include, but are not limited to, epoxides, such as, for example, decane epoxide and dodecane epoxide; vinyl ethers, such as, for example, cyclohexyl vinyl ether and Decave (International Flavors & Fragrances, Inc., New York, NY); and aromatic hydrocarbons, such as, for example, toluene and naphthalene. Useful halogenated organic solvents include, but are not limited to, tetrafluorodibromoethylene, tetrachloroethylene, trifluorochloroethylene, 1,2,4 trichlorobenzene, carbon tetrachloride. These materials have high densities.
Useful hydrocarbons include, but are not limited to, dodecane, tetradecane, the aliphatic hydrocarbons in the Isopar~' series (Exxon, Houston, TX), Norpar ( series of normal paraffinic liquids), Shell-Sol~ (Shell, Houston, TX), and Sol-Trol~ (Shell), naphtha, and other petroleum solvents.
These materials usually have low densities. Useful examples of silicone oils include, but are not limited to, octamethyl cyclosiloxane and higher molecular weight cyclic siloxanes, poly (methyl phenyl siloxane), hexamethyldisiloxane, and polydimethylsiloxane. These materials usually have low densities. Useful low molecular weight halogen-containing polymers include, but are not limited to, poly(chlorotrifluoroethylene) polymer (Halogenated hydrocarbon Inc., River Edge, NJ), Galden~ (a perfluorinated ether from Ausimont, Morristown, NJ), or KrytoX from Dupont (Wilmington, DE). In a preferred embodiment, the suspending fluid is a poly(chlorotrifluoroethylene) polymer. In a particularly preferred embodiment, this polymer has a degree of polymerization from about 2 to about 10. Many of the above materials are available in a range of viscosities, densities, and boiling points.
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FIG. SB, shows the display 500 tipped at a selected angle, so that the uncurod polymer 550 assumes a position such that it has a free surface (i.e, a surface not in contact with the microeapsule 520) which form an angle with respect to an axis Perpendicular to the display element 510. In the embodiment depicted, the Polymer 550 is more dense than the suspending fluid 540. In another embodiment, the density of the liquid polyzaer 550 is less than that of the suspending fluid 540. and the liquid polymer 5 50 would float on the suspending fluid 540. The polymer 550 is then cured, that is, it is hardened bythc action of light or heat, so that at least its free .;.~rlhCe becomes rigid. Fluorescent light, ultraviolet light, electron beams, or other ra~iiatioa sources may be used to cure the polymer 530. Alternatively, the polymer 530 may be cured by heat. in these embodiments, heat may be applied by microwave, thermal pulse, or heat lamp. It is possible to orient the display 500, cure the polymer 550 in a first capsule 510, reorient the display SGO to another angular position, and cure the polymer 550 coatained in a second capsule 510, in order to create a plurality of elements having cured polymer with different angular orientations in different micmcapsules. FIG. SC depicts a display 500 in which the polymer 550 has been curd to form display elemeats 510 having a first, larger surface 592, and a second, smaller surface 594.
~efeaing now to Fits. 6A and 6B, a capsule 20 of an electronically addressable media is illustrated in which the technique illustrated above is used with multiply rear-addressing electrodes. The capsule 20 contains at least one particle 50 dispersed in a clear suspending fluid 25. The capsule 20 is addressed by multigle smaller electrodes 30 and multiple larger electrodes 40. 1tr these embodiments, the smaller electrodes 30 stwuld be selected to collectively be at most one-half the size of the larger electrodes 40. In further embodiments, the smaller electrodes 30 are collectively one-fourth the size of the larger electrodes 40. In further embodiments the smaller electrodes 30 are collectively one-eighth the size of the larger electrodes 40. In preferred embodiments, the smaller electrodes 30 are collectively one-sixteenth the size of the larger electrodes. Each electrode 30 rnay be provided as separate electrodes that are controDed in parallel to control the display. Far example, each separate electrode may be substantially simultaneously set to the same voltage as all other electrodes of that size.
Alternatively, the electrodes 30, 40 may be interdigitated to provide the embodiment shown in FIGs. 6A and 68.
Operation of the rear-addressing electrode structure depicted in FIGS. 6A and 6B is similar to that described above. For example, the capsule 20 may contain positively charged, black pa~~ticles 50 dispersed in a substantially clear suspending fluid 25.
The smaller electrodes AMENDED SHEET
are colored black and the larger electrodes 40 are colored white or are highly reflective.
Referring to FIG. 6A, the smaller electrodes 30 are placed at a negative potential relative to the larger electrodes 40, causing particles 50 migrate within the capsule to the smaller electrodes 30 and the capsule 20 appears to the viewpoint 10 as a mix of the larger, white electrodes 40 and the smaller, black electrodes 30, creating an effect which is largely white.
Referring to Fig. 6B, when the smaller electrodes 30 are placed at a positive potential relative to the larger electrodes 40, particles 50 migrate to the larger electrodes 40 causing the capsule 20 to display a mix of the larger, white electrodes 40 occluded by the black particles SO and the smaller, black electrodes 30, creating an effect which is largely black. The techniques described above with respect to the embodiments depicted in FIGs. lA and 1B for producing two-color displays work with equal effectiveness in connection with these embodiments.
FIGs. 7A and 7B depict an embodiment of a rear-addressing electrode structure that creates a reflective color display in a manner similar to halftoning or pointillism. The capsule 20 contains white particles 55 dispersed in a clear suspending fluid 25.
Electrodes 42, 44, 46, 48 are colored cyan, magenta, yellow, and white respectively. Referring to FIG 7A, when the colored electrodes 42, 44, 46 are placed at a positive potential relative to the white electrode 48, negatively-charged particles 55 migrate to these three electrodes, causing the capsule 20 to present to the viewpoint 10 a mix of the white particles 55 and the white electrode 48, creating an effect which is largely white. Referring to FIG. 7B, when electrodes 42, 44, 46 are placed at a negative potential relative to electrode 48, particles 55 migrate to the white electrode 48, and the eye 10 sees a mix of the white particles 55, the cyan electrode 42, the magenta electrode 44, and the yellow electrode 46, creating an effect which is largely black or gray. By addressing the electrodes, any color can be produced that is possible with a subtractive color process. For example, to cause the capsule 20 to display an orange color to the viewpoint 10, the yellow electrode 46 and the magenta electrode 42 are set to a voltage potential that is more positive than the voltage potential applied by the cyan electrode 42 and the white electrode 48. Further, the relative intensities of these colors can be controlled by the actual voltage potentials applied to the electrodes. In another embodiment, the particles SS can be reflective or absorbing. In yet another embodiment, electrodes 42, 44, 46, 48 can be red, green, blue and white, respectively. In yet another embodiment, the particles 55 can be black and electrode 48 can be black.
In another embodiment, depicted in FIG. 8, a color display is provided by a capsule 20 of size d containing multiple species of particles in a clear, dispersing fluid 25. Each species of particles has different optical properties and possess different electrophoretic mobilities (~) from the other species. In the embodiment depicted in FIG. 8, the capsule 20 contains red particles 52, S blue particles 54, and green particles 56, and IN.I lu.l ~ IN I
That is, the magnitude of the electrophoretic mobility of the red particles 52, on average, exceeds the electrophoretic mobility of the blue particles 54, on average, and the electrophoretic mobility of the blue particles 54, on average, exceeds the average electrophoretic mobility of the green particles 56. As an example, there may be a species of red particle with a zeta potential of 100 millivolts (mV), a blue particle with a zeta potential of 60 mV, and a green particle with a zeta potential of 20 mV. The capsule 20 is placed between two electrodes 32, 42 that apply an electric field to the capsule.
FIGs. 9A-9B depict the steps to be taken to address the display shown in FIG.
8 to display a red color to a viewpoint 10. Referring to FIG. 9A, all the particles 52, 54, 56 are attracted to one side of the capsule 20 by applying an electric field in one direction. The electric field should be applied to the capsule 20 long enough to attract even the more slowly moving green particles 56 to the electrode 34. Referring to FIG. 9B, the electric field is reversed just long enough to allow the red particles 52 to migrate towards the electrode 32. The blue particles 54 and green particles 56 will also move in the reversed electric field, but they will not move as fast as the red particles 52 and thus will be obscured by the red particles 52. The amount of time for which the applied electric field must be reversed can be determined from the relative electrophoretic mobilities of the particles, the strength of the applied electric field, and the size of the capsule.
FIGS. l0A-lOD depict addressing the display element to a blue state. As shown in FIG.
10A, the particles 52, 54, 56 are initially randomly dispersed in the capsule 20. All the particles 52, 54, 56 are attracted to one side of the capsule 20 by applying an electric field in one direction (shown in FIG. lOB). Referring to FIG. l OC, the electric field is reversed just long enough to allow the red particles 52 and blue particles 54 to migrate towards the electrode 32. The amount of time for which the applied electric field must be reversed can be determined from the relative .. __._ ..__.._.~... ... . u- v- t~ 02329173 2000-10-18 CCIT'1~ ~~4~-i +q-9 R4 ~z:~4su.4a~:~1~
79-05-2000 . PCT/U S99/09172 ._____-_~ ivW aW.. fatal-tfTVt ~r electrophoretic mobilities of the particles, the strength of the applied electric field, and the size of the capsule. Referring to FI~Cr. l OD, the elec4ric field is then reversed a second time and the red particles 52, mo'zag faster than the blue particles 54, leave the bhie particles 54 exposai to the viewpoint 10. The amount of time for which the applied electric field must be reversed can be detemlined from the relative electrophoretic mobilities of the particles, the strength of the applied electric field, and the size of the capsule.
FIGS. 1 lA-11C depict the sups to be taken to present a green display to the viewpoint 10.
As shown in FIG. 11A, the particles 52, 54, 56 ate initially distributed randomly in the capsule 20. All the particles 52, 54, S6 are attracted to the side of the capsule 20 proximal the viewpoint 10 by applying as electric field in one direction. 'The electric field should be applied to the capsule 20 long enough to attract even the more slowly moving green particles 56 to the electrode 32. As shown in FIG. 11 C, the electric field is reversed~ust long enough to allow the red particles 52 and the blue particles 54 to migrate towards the electrode 54, leaving the slowly-moving green particles 56 displayed to the viewpoint. The amount of time for which the applied electric field must be reversed can be determined from the relative electrophoretic mobilities of the particles, the strength of the applied electric field, and the size of the capsule.
in other embodiments, the capsule contains multiple species of particles and a dyed dispersing fluid that acts as one of the colors. In still other embodiments, more than three species of particles may be provided having additional colors. Although FIGS. 8-11C
depict two electrodes associated with a single capsule, the electrodes may address multiple capsules or less than a full capsule While the invention has been particularly shown and described with reference to specific preferred embodiments, it should be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
AMENDED SHEET
Claims (53)
1. An electrophoretic display element comprising:
a deformable capsule having a first surface and a second surface, said first surface having a larger projected surface area than a projected surface area of said second surface when both surfaces are viewed in an intended viewing direction;
said capsule containing:
a suspending fluid; and at least one particle dispersed within said suspending fluid;
wherein application of a first electrical field causes the at least one particle to migrate towards said first surface and application of a second electrical field causes the at least one particle to migrate towards said second surface.
a deformable capsule having a first surface and a second surface, said first surface having a larger projected surface area than a projected surface area of said second surface when both surfaces are viewed in an intended viewing direction;
said capsule containing:
a suspending fluid; and at least one particle dispersed within said suspending fluid;
wherein application of a first electrical field causes the at least one particle to migrate towards said first surface and application of a second electrical field causes the at least one particle to migrate towards said second surface.
2. The display element of claim 1 wherein the at least one particle has an optical property such that said display element is substantially opaque when the at least one particle migrates towards said first surface.
3. The display element of claim 1 wherein the at least one particle has an optical property such that said display element is substantially reflective the at least one particle migrates towards said first surface.
4. The display element of claim 1 wherein said display element is substantially transparent when the at least one particle migrates towards said second surface.
5. A method of manufacturing an electrophoretic display element comprising the steps of:
encapsulating with a capsule a suspending fluid having a first optical property, and at least one particle dispersed within said suspending fluid and having a second optical property different from said first optical property to produce a deformable capsule;
and shaping said capsule to produce a first surface and a second surface, said first surface having a larger projected surface area than a projected surface area of said second surface when both surfaces are viewed in an intended viewing direction.
encapsulating with a capsule a suspending fluid having a first optical property, and at least one particle dispersed within said suspending fluid and having a second optical property different from said first optical property to produce a deformable capsule;
and shaping said capsule to produce a first surface and a second surface, said first surface having a larger projected surface area than a projected surface area of said second surface when both surfaces are viewed in an intended viewing direction.
6. The method of claim 5 comprising the additional step of providing electrodes adapted to address said display element.
7. An electrophoretic display comprising:
a plurality of display elements, each display element including:
a capsule having a first surface and a second surface, said first surface having a larger projected surface area than a projected surface area of said second surface when both surfaces are viewed in an intended viewing direction, said capsule containing.
a suspending fluid; and at least one particle dispersed. within said suspending fluid; and a first substrate defining a plurality of cavities, each cavity adapted to receive at least one of said plurality of display elements therein.
a plurality of display elements, each display element including:
a capsule having a first surface and a second surface, said first surface having a larger projected surface area than a projected surface area of said second surface when both surfaces are viewed in an intended viewing direction, said capsule containing.
a suspending fluid; and at least one particle dispersed. within said suspending fluid; and a first substrate defining a plurality of cavities, each cavity adapted to receive at least one of said plurality of display elements therein.
8. The display of claim 7 further comprising a second substrate disposed over said first substrate, enclosing said cavity.
9. The display of claim 7 wherein said first substrate comprises an embosses substrate defining said cavity.
10. The display of claim 7 wherein said first substrate comprises an etched substrate defining said cavity.
11. The display of claim 7 wherein said first substrate comprises a micromachined substrate defining said cavity.
12. The display of claim 7 wherein said first substrate defines conical receiving cavities.
13. The display of claim 7 wherein said first substrate defines grooves for receiving said capsule.
14. The display of claim 13 wherein said first substrate defines grooves having a triangular cross section for receiving said capsule.
15. The display of claim 13 wherein said first substrate defines grooves having a trapezoidal cross section for receiving said capsule.
16. The display of claim 13 wherein said first substrate defines grooves for receiving said capsule wherein said first surface and said second surface are disposed in a substantially parallel relationship.
17. A method of manufacturing an electrophoretic display comprising the steps of:
manufacturing a plurality of display elements, each display element being manufactured by a process comprising the steps of:
encapsulating with a capsule a suspending fluid having a first optical property, and at least one particle dispersed within said suspending fluid and having a second optical property differed from said first optical property; and shaping said capsule to produce a first surface and a second surface, said first surface having a larger projected surface area than a projected surface area of said second surface when both surfaces are viewed in an intended viewing direction;
providing a substrate defining a plurality of cavities, each cavity adapted to receive one of said plurality of display elements therein; and situating at least one of said plurality of display elements within at least one of said plurality of cavities defined within said substrate.
manufacturing a plurality of display elements, each display element being manufactured by a process comprising the steps of:
encapsulating with a capsule a suspending fluid having a first optical property, and at least one particle dispersed within said suspending fluid and having a second optical property differed from said first optical property; and shaping said capsule to produce a first surface and a second surface, said first surface having a larger projected surface area than a projected surface area of said second surface when both surfaces are viewed in an intended viewing direction;
providing a substrate defining a plurality of cavities, each cavity adapted to receive one of said plurality of display elements therein; and situating at least one of said plurality of display elements within at least one of said plurality of cavities defined within said substrate.
18. the method of claim 17 comprising the additional step of providing electrodes adapted to address each of said display elements individually.
19. The method of claim 17 wherein the step of providing a substrate comprises providing a substrate defining a plurality of conical cavities therein.
20. The method of claim 17 wherein the step of providing a substrate comprises providing a substrate defining a plurality of pyramidal cavities therein
21. The method of claim 17 wherein the step of providing a substrate comprises providing a substrate defining a plurality of grooves therein.
22. An electrophoretic display element comprising:
a capsule having a first surface and a second surface and containing a structural portion produced after said capsule is sealed, said structural portion adjacent to at least a portion of said second surface of said capsule and oriented at an oblique angle relative to said second surface to create a display portion of said capsule wherein one of said first surface and said second surface has a larger projected area than the other of said first surface and said second surface, said projected areas being measured when viewed in an intended viewing direction, said display portion including:
a suspending fluid; and at least one particle dispersed within said suspending fluid;
wherein application of a first electrical field causes the at least one particle to migrate towards said first surface of said capsule and application of a second electrical field causes the at least one panicle to migrate towards said second surface of said capsule.
a capsule having a first surface and a second surface and containing a structural portion produced after said capsule is sealed, said structural portion adjacent to at least a portion of said second surface of said capsule and oriented at an oblique angle relative to said second surface to create a display portion of said capsule wherein one of said first surface and said second surface has a larger projected area than the other of said first surface and said second surface, said projected areas being measured when viewed in an intended viewing direction, said display portion including:
a suspending fluid; and at least one particle dispersed within said suspending fluid;
wherein application of a first electrical field causes the at least one particle to migrate towards said first surface of said capsule and application of a second electrical field causes the at least one panicle to migrate towards said second surface of said capsule.
23 The display element of claim 22 wherein the at least one particle has an optical property such that said display element is substantially opaque when the at least one particle migrates towards said first surface.
24 The display element of claim 22 wherein the at least one particle has an optical property such that said display element is substantially reflective a when the at least one particle migrates towards said first surface.
25. The display element of claim 22 wherein said display element is substantially transparent when the at least one particle migrates towards said second surface
26. The display element of claim 22 wherein said structural portion comprises a polymer.
27. The display element of claim 22 wherein said structural portion comprises a thermoset polymer.
28. The display element of claim 22 wherein said structural portion comprises a photohardenable polymer.
29. A method of manufacturing an electrophoretic display element comprising the steps of:
encapsulating within a capsule a suspending fluid having a first optical property, at least one particle dispersed within said suspending fluid and having a second optical property different from said first optical property, and a structural material;
orienting said capsule in a predetermined orientation; and treating said structural material within said capsule to form a capsule comprising a display portion having a first surface, a second surface and a structural portion, said structural portion adjacent to at least a portion of said second surface and oriented at an oblique angle relative to said second surface of said capsule, and one of said first surface and said second surface having a larger projected area than the other of said first surface and said second surface, said projected areas being measured when viewed in an intended viewing direction.
encapsulating within a capsule a suspending fluid having a first optical property, at least one particle dispersed within said suspending fluid and having a second optical property different from said first optical property, and a structural material;
orienting said capsule in a predetermined orientation; and treating said structural material within said capsule to form a capsule comprising a display portion having a first surface, a second surface and a structural portion, said structural portion adjacent to at least a portion of said second surface and oriented at an oblique angle relative to said second surface of said capsule, and one of said first surface and said second surface having a larger projected area than the other of said first surface and said second surface, said projected areas being measured when viewed in an intended viewing direction.
30. The method according to claim 29 wherein the step of treating said structural material comprises polymerizing said structural material.
31. The method according to claim 29 wherein the step of treating said structural material comprises photohardening said structural material.
32. The method according to claim 29 wherein the step of treating said structural material comprises thermally treating said structural material.
33. The method according to claim 29 wherein the step of treating said structural material comprises melting and solidifying said structural material.
34. An electrophoretic display comprising:
a plurality of display elements, each display element including:
a capsule having a first surface and a second surface and containing a structural portion produced after said capsule is sealed, said structural portion adjacent to at least a portion of said second surface and oriented at an oblique angle relative to said second surface of said capsule to create a display portion of said capsule wherein one of said first surface and said second surface has a larger projected area than the other of said first surface and said second surface, said projected areas being measured when viewed in an intended viewing direction, said display portion including:
a suspending fluid; and at least one particle dispersed within said suspending fluid; and a first substrate adapted to receive said plurality of display elements.
a plurality of display elements, each display element including:
a capsule having a first surface and a second surface and containing a structural portion produced after said capsule is sealed, said structural portion adjacent to at least a portion of said second surface and oriented at an oblique angle relative to said second surface of said capsule to create a display portion of said capsule wherein one of said first surface and said second surface has a larger projected area than the other of said first surface and said second surface, said projected areas being measured when viewed in an intended viewing direction, said display portion including:
a suspending fluid; and at least one particle dispersed within said suspending fluid; and a first substrate adapted to receive said plurality of display elements.
35. The display of claim 34 wherein each of said display elements is individually addressable.
36. (Canceled).
37. (Canceled).
38. (Canceled).
39. A method of manufacturing an electrophoretic display comprising the steps of:
manufacturing a plurality of display elements, each display element being manufactured by a process comprising the steps of:
encapsulating within a capsule a suspending fluid having a first optical property, at least one particle dispersed within said suspending fluid and having a second optical property different from said first optical property, and a structural material;
providing a substrate adapted to receive said plurality of display elements;
situating at least one of said plurality of display elements on said substrate;
orienting said substrate in a predetermined orientation; and treating said structural material within each of said plurality of capsules to form within each of said plurality of capsules a display portion having a first surface, a second surface and a structural portion, said structural portion adjacent to at least a portion of said second surface and oriented at an oblique angle relative to said second surface, one of said fast surface and said second surface having a larger projected area than the other of said first surface and said second surface, said projected areas being measured when viewed in an intended viewing direction.
manufacturing a plurality of display elements, each display element being manufactured by a process comprising the steps of:
encapsulating within a capsule a suspending fluid having a first optical property, at least one particle dispersed within said suspending fluid and having a second optical property different from said first optical property, and a structural material;
providing a substrate adapted to receive said plurality of display elements;
situating at least one of said plurality of display elements on said substrate;
orienting said substrate in a predetermined orientation; and treating said structural material within each of said plurality of capsules to form within each of said plurality of capsules a display portion having a first surface, a second surface and a structural portion, said structural portion adjacent to at least a portion of said second surface and oriented at an oblique angle relative to said second surface, one of said fast surface and said second surface having a larger projected area than the other of said first surface and said second surface, said projected areas being measured when viewed in an intended viewing direction.
40. The method of claim 39 comprising the additional step of providing electrodes adapted to address each of said display elements individually.
41. (Canceled).
42. (Canceled).
43. (Canceled).
44. An electrophoretic display element comprising;
a deformable capsule having a first surface and a second surface, wherein said first surface and said second surface comprise different projected areas when viewed in the intended viewing direction;
said capsule containing:
a suspending fluid; and at least one particle dispersed within said suspending fluid;
wherein application of a first electrical field causes the at least one particle to migrate towards said first surface and application of a second electrical field causes the at least one particle to migrate towards said second surface.
a deformable capsule having a first surface and a second surface, wherein said first surface and said second surface comprise different projected areas when viewed in the intended viewing direction;
said capsule containing:
a suspending fluid; and at least one particle dispersed within said suspending fluid;
wherein application of a first electrical field causes the at least one particle to migrate towards said first surface and application of a second electrical field causes the at least one particle to migrate towards said second surface.
45. The display element of claim 44 wherein said first surd and said second surface are substantially parallel.
46. The display element of claim 44 wherein said first surface and said second surface are relatively oblique.
4. The display element of claim 1 wherein a cross section of said element comprises a polygon of N sides, where N ranges from 5 to 12.
48. The display element of claim 4? wherein said polygon comprises a regular polygon.
49. A method of manufacturing an electrophoretic display comprising the steps of:
manufacturing a plurality of display elements, each display element being manufactured by a process comprising the step of:
encapsulating with a capsule a suspending fluid having a first optical property, and at least one particle dispersed within said suspending fluid and having a second optical property different from said first optical property to produce a deformable capsule;
providing a substrate defining a plurality of cavities, each cavity adapted to receive one of said plurality of display elements therein; and situating at least one of said plurality of display elements within at least one of said plurality of cavities defined within said substrate, the shape of said deformable capsule conforming to said receiving cavity to produce a first surface and a second surface, said first surface having a larger projected surface area than a projected surface area of said second surface when both surfaces are viewed in an intended viewing direction.
manufacturing a plurality of display elements, each display element being manufactured by a process comprising the step of:
encapsulating with a capsule a suspending fluid having a first optical property, and at least one particle dispersed within said suspending fluid and having a second optical property different from said first optical property to produce a deformable capsule;
providing a substrate defining a plurality of cavities, each cavity adapted to receive one of said plurality of display elements therein; and situating at least one of said plurality of display elements within at least one of said plurality of cavities defined within said substrate, the shape of said deformable capsule conforming to said receiving cavity to produce a first surface and a second surface, said first surface having a larger projected surface area than a projected surface area of said second surface when both surfaces are viewed in an intended viewing direction.
50. The method of claim 49 comprising the additional step of providing electrodes adapted to address each of said display elements individually.
51. The method of claim 49 wherein the step of providing a substrate comprises providing a substrate defining a plurality of conical cavities therein
52. The method of claim 49 wherein the step of providing a substrate comprises providing a substrate defining a plurality of pyramidal cavities therein.
53. The method of claim 49 wherein the step of providing a substrate comprises providing a substrate defining a plurality of grooves therein.
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Families Citing this family (511)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8139050B2 (en) * | 1995-07-20 | 2012-03-20 | E Ink Corporation | Addressing schemes for electronic displays |
US7327511B2 (en) | 2004-03-23 | 2008-02-05 | E Ink Corporation | Light modulators |
US7193625B2 (en) * | 1999-04-30 | 2007-03-20 | E Ink Corporation | Methods for driving electro-optic displays, and apparatus for use therein |
US7583251B2 (en) * | 1995-07-20 | 2009-09-01 | E Ink Corporation | Dielectrophoretic displays |
US7999787B2 (en) * | 1995-07-20 | 2011-08-16 | E Ink Corporation | Methods for driving electrophoretic displays using dielectrophoretic forces |
US6710540B1 (en) * | 1995-07-20 | 2004-03-23 | E Ink Corporation | Electrostatically-addressable electrophoretic display |
US7079305B2 (en) | 2001-03-19 | 2006-07-18 | E Ink Corporation | Electrophoretic medium and process for the production thereof |
US6866760B2 (en) * | 1998-08-27 | 2005-03-15 | E Ink Corporation | Electrophoretic medium and process for the production thereof |
US7848006B2 (en) | 1995-07-20 | 2010-12-07 | E Ink Corporation | Electrophoretic displays with controlled amounts of pigment |
US7259744B2 (en) * | 1995-07-20 | 2007-08-21 | E Ink Corporation | Dielectrophoretic displays |
US7109968B2 (en) * | 1995-07-20 | 2006-09-19 | E Ink Corporation | Non-spherical cavity electrophoretic displays and methods and materials for making the same |
US7411719B2 (en) | 1995-07-20 | 2008-08-12 | E Ink Corporation | Electrophoretic medium and process for the production thereof |
US6323989B1 (en) | 1996-07-19 | 2001-11-27 | E Ink Corporation | Electrophoretic displays using nanoparticles |
US6538801B2 (en) | 1996-07-19 | 2003-03-25 | E Ink Corporation | Electrophoretic displays using nanoparticles |
US7242513B2 (en) * | 1997-08-28 | 2007-07-10 | E Ink Corporation | Encapsulated electrophoretic displays having a monolayer of capsules and materials and methods for making the same |
US7002728B2 (en) * | 1997-08-28 | 2006-02-21 | E Ink Corporation | Electrophoretic particles, and processes for the production thereof |
US8040594B2 (en) | 1997-08-28 | 2011-10-18 | E Ink Corporation | Multi-color electrophoretic displays |
US6839158B2 (en) * | 1997-08-28 | 2005-01-04 | E Ink Corporation | Encapsulated electrophoretic displays having a monolayer of capsules and materials and methods for making the same |
US7247379B2 (en) * | 1997-08-28 | 2007-07-24 | E Ink Corporation | Electrophoretic particles, and processes for the production thereof |
US6704133B2 (en) | 1998-03-18 | 2004-03-09 | E-Ink Corporation | Electro-optic display overlays and systems for addressing such displays |
US7075502B1 (en) | 1998-04-10 | 2006-07-11 | E Ink Corporation | Full color reflective display with multichromatic sub-pixels |
EP1075670B1 (en) * | 1998-04-27 | 2008-12-17 | E-Ink Corporation | Shutter mode microencapsulated electrophoretic display |
JP4651193B2 (en) * | 1998-05-12 | 2011-03-16 | イー インク コーポレイション | Microencapsulated electrophoretic electrostatically addressed media for drawing device applications |
EP1093600B1 (en) | 1998-07-08 | 2004-09-15 | E Ink Corporation | Methods for achieving improved color in microencapsulated electrophoretic devices |
US6262833B1 (en) * | 1998-10-07 | 2001-07-17 | E Ink Corporation | Capsules for electrophoretic displays and methods for making the same |
US6987502B1 (en) * | 1999-01-08 | 2006-01-17 | Canon Kabushiki Kaisha | Electrophoretic display device |
WO2000049593A1 (en) * | 1999-02-19 | 2000-08-24 | Seiko Epson Corporation | Method for producing display panel and display panel |
US7088335B2 (en) * | 1999-04-28 | 2006-08-08 | Novus Partners Llc | Methods and apparatus for ultra-violet stimulated displays |
US6430605B2 (en) * | 1999-04-28 | 2002-08-06 | World Theatre, Inc. | System permitting retail stores to place advertisements on roadside electronic billboard displays that tie into point of purchase displays at stores |
US6424998B2 (en) | 1999-04-28 | 2002-07-23 | World Theatre, Inc. | System permitting the display of video or still image content on selected displays of an electronic display network according to customer dictates |
US6430603B2 (en) * | 1999-04-28 | 2002-08-06 | World Theatre, Inc. | System for direct placement of commercial advertising, public service announcements and other content on electronic billboard displays |
US7012600B2 (en) | 1999-04-30 | 2006-03-14 | E Ink Corporation | Methods for driving bistable electro-optic displays, and apparatus for use therein |
US7119772B2 (en) | 1999-04-30 | 2006-10-10 | E Ink Corporation | Methods for driving bistable electro-optic displays, and apparatus for use therein |
US8115729B2 (en) | 1999-05-03 | 2012-02-14 | E Ink Corporation | Electrophoretic display element with filler particles |
US8009348B2 (en) | 1999-05-03 | 2011-08-30 | E Ink Corporation | Machine-readable displays |
US7119759B2 (en) | 1999-05-03 | 2006-10-10 | E Ink Corporation | Machine-readable displays |
DE19927359A1 (en) * | 1999-06-16 | 2000-12-21 | Creavis Tech & Innovation Gmbh | Electrophoretic displays made of light-scattering carrier materials |
DE19927361A1 (en) * | 1999-06-16 | 2000-12-21 | Creavis Tech & Innovation Gmbh | Electrophoretic displays |
EP1192504B1 (en) | 1999-07-01 | 2011-03-16 | E Ink Corporation | Electrophoretic medium provided with spacers |
JP4744757B2 (en) | 1999-07-21 | 2011-08-10 | イー インク コーポレイション | Use of storage capacitors to enhance the performance of active matrix driven electronic displays. |
US6879314B1 (en) * | 1999-09-28 | 2005-04-12 | Brother International Corporation | Methods and apparatus for subjecting an element to an electrical field |
US6930818B1 (en) | 2000-03-03 | 2005-08-16 | Sipix Imaging, Inc. | Electrophoretic display and novel process for its manufacture |
US6672921B1 (en) | 2000-03-03 | 2004-01-06 | Sipix Imaging, Inc. | Manufacturing process for electrophoretic display |
US6933098B2 (en) | 2000-01-11 | 2005-08-23 | Sipix Imaging Inc. | Process for roll-to-roll manufacture of a display by synchronized photolithographic exposure on a substrate web |
US6829078B2 (en) | 2000-03-03 | 2004-12-07 | Sipix Imaging Inc. | Electrophoretic display and novel process for its manufacture |
US7158282B2 (en) * | 2000-03-03 | 2007-01-02 | Sipix Imaging, Inc. | Electrophoretic display and novel process for its manufacture |
US6788449B2 (en) | 2000-03-03 | 2004-09-07 | Sipix Imaging, Inc. | Electrophoretic display and novel process for its manufacture |
US20070237962A1 (en) * | 2000-03-03 | 2007-10-11 | Rong-Chang Liang | Semi-finished display panels |
US6885495B2 (en) * | 2000-03-03 | 2005-04-26 | Sipix Imaging Inc. | Electrophoretic display with in-plane switching |
US7715088B2 (en) | 2000-03-03 | 2010-05-11 | Sipix Imaging, Inc. | Electrophoretic display |
US7557981B2 (en) * | 2000-03-03 | 2009-07-07 | Sipix Imaging, Inc. | Electrophoretic display and process for its manufacture |
US7408696B2 (en) | 2000-03-03 | 2008-08-05 | Sipix Imaging, Inc. | Three-dimensional electrophoretic displays |
US6831770B2 (en) | 2000-03-03 | 2004-12-14 | Sipix Imaging, Inc. | Electrophoretic display and novel process for its manufacture |
US6865012B2 (en) | 2000-03-03 | 2005-03-08 | Sipix Imaging, Inc. | Electrophoretic display and novel process for its manufacture |
US6833943B2 (en) | 2000-03-03 | 2004-12-21 | Sipix Imaging, Inc. | Electrophoretic display and novel process for its manufacture |
US7142351B2 (en) * | 2000-03-03 | 2006-11-28 | Sipix Imaging, Inc. | Electro-magnetophoresis display |
US7052571B2 (en) * | 2000-03-03 | 2006-05-30 | Sipix Imaging, Inc. | Electrophoretic display and process for its manufacture |
US7233429B2 (en) * | 2000-03-03 | 2007-06-19 | Sipix Imaging, Inc. | Electrophoretic display |
US20030048522A1 (en) * | 2001-09-13 | 2003-03-13 | Rong-Chang Liang | Three-dimensional electrophoretic displays |
US7576904B2 (en) * | 2000-03-03 | 2009-08-18 | Sipix Imaging, Inc. | Electro-magnetophoresis display |
AU2001253575A1 (en) | 2000-04-18 | 2001-10-30 | E-Ink Corporation | Process for fabricating thin film transistors |
US7893435B2 (en) | 2000-04-18 | 2011-02-22 | E Ink Corporation | Flexible electronic circuits and displays including a backplane comprising a patterned metal foil having a plurality of apertures extending therethrough |
US20050289015A1 (en) * | 2000-05-17 | 2005-12-29 | Hunter Charles E | System and method permitting merchants to use electronic billboard displays to carry advertisements for products that can be purchased through a universal, automated order processing system |
US6304365B1 (en) * | 2000-06-02 | 2001-10-16 | The University Of British Columbia | Enhanced effective refractive index total internal reflection image display |
DE10031294A1 (en) * | 2000-06-27 | 2002-01-10 | Creavis Tech & Innovation Gmbh | Switchable mirror film |
JP4785231B2 (en) * | 2000-08-07 | 2011-10-05 | キヤノン株式会社 | Electrophoretic display device and manufacturing method thereof |
US6816147B2 (en) * | 2000-08-17 | 2004-11-09 | E Ink Corporation | Bistable electro-optic display, and method for addressing same |
US6692646B2 (en) * | 2000-08-29 | 2004-02-17 | Display Science, Inc. | Method of manufacturing a light modulating capacitor array and product |
JP2004527776A (en) * | 2000-09-08 | 2004-09-09 | キャボット コーポレイション | Electrophoretic display containing modified particles |
JP3805180B2 (en) * | 2000-09-14 | 2006-08-02 | 株式会社東芝 | Display element |
JP2002107771A (en) * | 2000-09-29 | 2002-04-10 | Fuji Xerox Co Ltd | Picture display medium and image forming apparatus |
US7038832B2 (en) * | 2000-10-27 | 2006-05-02 | Seiko Epson Corporation | Electrophoretic display, method for making the electrophoretic display, and electronic apparatus |
JP4868560B2 (en) * | 2000-11-29 | 2012-02-01 | スタンレー電気株式会社 | Display device and manufacturing method thereof |
AU2002230520A1 (en) * | 2000-11-29 | 2002-06-11 | E-Ink Corporation | Addressing circuitry for large electronic displays |
US6476725B2 (en) | 2000-11-30 | 2002-11-05 | Compaq Information Technologies Group, L.P. | Visual meter for providing a long-term indication of dynamic parameters |
US20020090980A1 (en) * | 2000-12-05 | 2002-07-11 | Wilcox Russell J. | Displays for portable electronic apparatus |
US8282762B2 (en) * | 2001-01-11 | 2012-10-09 | Sipix Imaging, Inc. | Transmissive or reflective liquid crystal display and process for its manufacture |
US7471369B2 (en) * | 2001-01-11 | 2008-12-30 | Sipix Imaging, Inc. | Transmissive or reflective liquid crystal display and process for its manufacture |
US6795138B2 (en) * | 2001-01-11 | 2004-09-21 | Sipix Imaging, Inc. | Transmissive or reflective liquid crystal display and novel process for its manufacture |
EP2312380B1 (en) | 2001-02-27 | 2020-11-18 | Dolby Laboratories Licensing Corporation | A method and device for displaying an image |
NL1017468C2 (en) * | 2001-02-28 | 2002-08-29 | Zetfolie B V | Foil layer system for use in multicolor electrophoretic imaging systems. |
NL1017467C2 (en) * | 2001-02-28 | 2002-08-29 | Zetfolie B V | Foil system for use in a multi-color electrophoretic imaging system. |
AU2002250304A1 (en) * | 2001-03-13 | 2002-09-24 | E Ink Corporation | Apparatus for displaying drawings |
TW574512B (en) * | 2001-03-14 | 2004-02-01 | Koninkl Philips Electronics Nv | Electrophoretic display device |
ATE494572T1 (en) * | 2001-03-19 | 2011-01-15 | E Ink Corp | ELECTROPHORETIC MEDIUM |
EP1666964B1 (en) * | 2001-04-02 | 2018-12-19 | E Ink Corporation | Electrophoretic medium with improved image stability |
US8390918B2 (en) | 2001-04-02 | 2013-03-05 | E Ink Corporation | Electrophoretic displays with controlled amounts of pigment |
US7230750B2 (en) * | 2001-05-15 | 2007-06-12 | E Ink Corporation | Electrophoretic media and processes for the production thereof |
US20050156340A1 (en) | 2004-01-20 | 2005-07-21 | E Ink Corporation | Preparation of capsules |
US7679814B2 (en) | 2001-04-02 | 2010-03-16 | E Ink Corporation | Materials for use in electrophoretic displays |
US6580545B2 (en) * | 2001-04-19 | 2003-06-17 | E Ink Corporation | Electrochromic-nanoparticle displays |
US6753067B2 (en) | 2001-04-23 | 2004-06-22 | Sipix Imaging, Inc. | Microcup compositions having improved flexure resistance and release properties |
WO2002086612A1 (en) * | 2001-04-25 | 2002-10-31 | Koninklijke Philips Electronics N.V. | Electrophoretic color display device |
US6870661B2 (en) * | 2001-05-15 | 2005-03-22 | E Ink Corporation | Electrophoretic displays containing magnetic particles |
JP4188091B2 (en) * | 2001-05-15 | 2008-11-26 | イー インク コーポレイション | Electrophoretic particles |
US20090009852A1 (en) * | 2001-05-15 | 2009-01-08 | E Ink Corporation | Electrophoretic particles and processes for the production thereof |
US6549327B2 (en) | 2001-05-24 | 2003-04-15 | Xerox Corporation | Photochromic gyricon display |
JP4878698B2 (en) * | 2001-05-30 | 2012-02-15 | 株式会社リコー | Recording material, liquid developer and image forming method using the same |
US20020188053A1 (en) | 2001-06-04 | 2002-12-12 | Sipix Imaging, Inc. | Composition and process for the sealing of microcups in roll-to-roll display manufacturing |
US7205355B2 (en) | 2001-06-04 | 2007-04-17 | Sipix Imaging, Inc. | Composition and process for the manufacture of an improved electrophoretic display |
US8361356B2 (en) | 2001-06-04 | 2013-01-29 | Sipix Imaging, Inc. | Composition and process for the sealing of microcups in roll-to-roll display manufacturing |
US6975304B1 (en) * | 2001-06-11 | 2005-12-13 | Handspring, Inc. | Interface for processing of an alternate symbol in a computer device |
US7098869B2 (en) * | 2001-06-29 | 2006-08-29 | Novus Partners Llc | Business method for billboard advertising |
US7015875B2 (en) * | 2001-06-29 | 2006-03-21 | Novus Partners Llc | Dynamic device for billboard advertising |
US7098870B2 (en) * | 2001-06-29 | 2006-08-29 | Novus Partners Llc | Advertising method for dynamic billboards |
US7088352B2 (en) * | 2002-06-19 | 2006-08-08 | Novus Partners Llc | Dynamic device and method for dispensing machines |
US7535624B2 (en) | 2001-07-09 | 2009-05-19 | E Ink Corporation | Electro-optic display and materials for use therein |
US7110163B2 (en) | 2001-07-09 | 2006-09-19 | E Ink Corporation | Electro-optic display and lamination adhesive for use therein |
WO2003007066A2 (en) * | 2001-07-09 | 2003-01-23 | E Ink Corporation | Electro-optical display having a lamination adhesive layer |
US6982178B2 (en) | 2002-06-10 | 2006-01-03 | E Ink Corporation | Components and methods for use in electro-optic displays |
EP1407320B1 (en) * | 2001-07-09 | 2006-12-20 | E Ink Corporation | Electro-optic display and adhesive composition |
TW527529B (en) * | 2001-07-27 | 2003-04-11 | Sipix Imaging Inc | An improved electrophoretic display with color filters |
US6967640B2 (en) * | 2001-07-27 | 2005-11-22 | E Ink Corporation | Microencapsulated electrophoretic display with integrated driver |
US6819471B2 (en) * | 2001-08-16 | 2004-11-16 | E Ink Corporation | Light modulation by frustration of total internal reflection |
US7492505B2 (en) * | 2001-08-17 | 2009-02-17 | Sipix Imaging, Inc. | Electrophoretic display with dual mode switching |
US7038670B2 (en) | 2002-08-16 | 2006-05-02 | Sipix Imaging, Inc. | Electrophoretic display with dual mode switching |
TW550529B (en) | 2001-08-17 | 2003-09-01 | Sipix Imaging Inc | An improved electrophoretic display with dual-mode switching |
TW539928B (en) | 2001-08-20 | 2003-07-01 | Sipix Imaging Inc | An improved transflective electrophoretic display |
JP4059034B2 (en) * | 2001-08-20 | 2008-03-12 | セイコーエプソン株式会社 | Electrophoresis device, electronic apparatus, and method of manufacturing the electrophoresis device |
TWI308231B (en) * | 2001-08-28 | 2009-04-01 | Sipix Imaging Inc | Electrophoretic display |
JP4785300B2 (en) * | 2001-09-07 | 2011-10-05 | 株式会社半導体エネルギー研究所 | Electrophoretic display device, display device, and electronic device |
TW573204B (en) | 2001-09-12 | 2004-01-21 | Sipix Imaging Inc | An improved electrophoretic display with gating electrodes |
US6825970B2 (en) * | 2001-09-14 | 2004-11-30 | E Ink Corporation | Methods for addressing electro-optic materials |
GB0124247D0 (en) * | 2001-10-10 | 2001-11-28 | Koninkl Philips Electronics Nv | Colour display device |
US6850230B1 (en) * | 2001-10-16 | 2005-02-01 | Hewlett-Packard Development Company, L.P. | Electronic writing and erasing pencil |
TWI229763B (en) | 2001-10-29 | 2005-03-21 | Sipix Imaging Inc | An improved electrophoretic display with holding electrodes |
US7064740B2 (en) * | 2001-11-09 | 2006-06-20 | Sharp Laboratories Of America, Inc. | Backlit display with improved dynamic range |
US7528822B2 (en) | 2001-11-20 | 2009-05-05 | E Ink Corporation | Methods for driving electro-optic displays |
CN102789764B (en) | 2001-11-20 | 2015-05-27 | 伊英克公司 | Methods for driving bistable electro-optic displays |
US7952557B2 (en) | 2001-11-20 | 2011-05-31 | E Ink Corporation | Methods and apparatus for driving electro-optic displays |
US9412314B2 (en) | 2001-11-20 | 2016-08-09 | E Ink Corporation | Methods for driving electro-optic displays |
US8593396B2 (en) | 2001-11-20 | 2013-11-26 | E Ink Corporation | Methods and apparatus for driving electro-optic displays |
US8125501B2 (en) | 2001-11-20 | 2012-02-28 | E Ink Corporation | Voltage modulated driver circuits for electro-optic displays |
US9530363B2 (en) | 2001-11-20 | 2016-12-27 | E Ink Corporation | Methods and apparatus for driving electro-optic displays |
US8558783B2 (en) | 2001-11-20 | 2013-10-15 | E Ink Corporation | Electro-optic displays with reduced remnant voltage |
AU2003218071A1 (en) * | 2002-03-11 | 2003-09-29 | Tahl Salomon | Systems and methods employing changeable touch-key |
ES2675880T3 (en) | 2002-03-13 | 2018-07-13 | Dolby Laboratories Licensing Corporation | Failure compensation of light emitting element on a monitor |
US8687271B2 (en) | 2002-03-13 | 2014-04-01 | Dolby Laboratories Licensing Corporation | N-modulation displays and related methods |
US6885146B2 (en) | 2002-03-14 | 2005-04-26 | Semiconductor Energy Laboratory Co., Ltd. | Display device comprising substrates, contrast medium and barrier layers between contrast medium and each of substrates |
US6950220B2 (en) | 2002-03-18 | 2005-09-27 | E Ink Corporation | Electro-optic displays, and methods for driving same |
US7190008B2 (en) | 2002-04-24 | 2007-03-13 | E Ink Corporation | Electro-optic displays, and components for use therein |
US8002948B2 (en) | 2002-04-24 | 2011-08-23 | Sipix Imaging, Inc. | Process for forming a patterned thin film structure on a substrate |
US7261920B2 (en) | 2002-04-24 | 2007-08-28 | Sipix Imaging, Inc. | Process for forming a patterned thin film structure on a substrate |
TWI240842B (en) | 2002-04-24 | 2005-10-01 | Sipix Imaging Inc | Matrix driven electrophoretic display with multilayer back plane |
US7223672B2 (en) * | 2002-04-24 | 2007-05-29 | E Ink Corporation | Processes for forming backplanes for electro-optic displays |
US7972472B2 (en) | 2002-04-24 | 2011-07-05 | Sipix Imaging, Inc. | Process for forming a patterned thin film structure for in-mold decoration |
TWI268813B (en) * | 2002-04-24 | 2006-12-21 | Sipix Imaging Inc | Process for forming a patterned thin film conductive structure on a substrate |
KR100896167B1 (en) * | 2002-04-24 | 2009-05-11 | 이 잉크 코포레이션 | Electronic displays |
US7156945B2 (en) | 2002-04-24 | 2007-01-02 | Sipix Imaging, Inc. | Process for forming a patterned thin film structure for in-mold decoration |
US6958848B2 (en) * | 2002-05-23 | 2005-10-25 | E Ink Corporation | Capsules, materials for use therein and electrophoretic media and displays containing such capsules |
EP1512135A1 (en) * | 2002-05-24 | 2005-03-09 | Koninklijke Philips Electronics N.V. | An electrophoretic display and a method of driving an electrophoretic display |
US7554712B2 (en) | 2005-06-23 | 2009-06-30 | E Ink Corporation | Edge seals for, and processes for assembly of, electro-optic displays |
US7583427B2 (en) | 2002-06-10 | 2009-09-01 | E Ink Corporation | Components and methods for use in electro-optic displays |
US7649674B2 (en) | 2002-06-10 | 2010-01-19 | E Ink Corporation | Electro-optic display with edge seal |
US7843621B2 (en) | 2002-06-10 | 2010-11-30 | E Ink Corporation | Components and testing methods for use in the production of electro-optic displays |
US8049947B2 (en) | 2002-06-10 | 2011-11-01 | E Ink Corporation | Components and methods for use in electro-optic displays |
US9470950B2 (en) | 2002-06-10 | 2016-10-18 | E Ink Corporation | Electro-optic displays, and processes for the production thereof |
US7110164B2 (en) | 2002-06-10 | 2006-09-19 | E Ink Corporation | Electro-optic displays, and processes for the production thereof |
US8363299B2 (en) | 2002-06-10 | 2013-01-29 | E Ink Corporation | Electro-optic displays, and processes for the production thereof |
US20080024482A1 (en) | 2002-06-13 | 2008-01-31 | E Ink Corporation | Methods for driving electro-optic displays |
EP1512137A2 (en) | 2002-06-13 | 2005-03-09 | E Ink Corporation | Methods for driving electro-optic displays |
US20110199671A1 (en) * | 2002-06-13 | 2011-08-18 | E Ink Corporation | Methods for driving electrophoretic displays using dielectrophoretic forces |
JP4416380B2 (en) * | 2002-06-14 | 2010-02-17 | キヤノン株式会社 | Electrophoretic display device and driving method thereof |
US20040030111A1 (en) * | 2002-06-19 | 2004-02-12 | Turner Douglas H. | Oligonucleotide directed misfolding of RNA |
CN1668972A (en) * | 2002-07-17 | 2005-09-14 | 皇家飞利浦电子股份有限公司 | In-plane switching electrophoretic display devices |
WO2004008239A1 (en) * | 2002-07-17 | 2004-01-22 | Bridgestone Corporation | Image display |
WO2004017135A2 (en) * | 2002-08-06 | 2004-02-26 | E Ink Corporation | Protection of electro-optic displays against thermal effects |
US7312916B2 (en) * | 2002-08-07 | 2007-12-25 | E Ink Corporation | Electrophoretic media containing specularly reflective particles |
US7271947B2 (en) | 2002-08-16 | 2007-09-18 | Sipix Imaging, Inc. | Electrophoretic display with dual-mode switching |
US7038656B2 (en) | 2002-08-16 | 2006-05-02 | Sipix Imaging, Inc. | Electrophoretic display with dual-mode switching |
US7071895B2 (en) * | 2002-08-22 | 2006-07-04 | Novus Communication Technologies, Inc. | Pseudo bit-depth system for dynamic billboards |
JP4337439B2 (en) * | 2002-08-22 | 2009-09-30 | セイコーエプソン株式会社 | Electrophoresis equipment, electronic equipment |
EP3056941B1 (en) | 2002-09-03 | 2019-01-09 | E Ink Corporation | Electro-phoretic medium |
US7839564B2 (en) | 2002-09-03 | 2010-11-23 | E Ink Corporation | Components and methods for use in electro-optic displays |
WO2004023202A1 (en) * | 2002-09-03 | 2004-03-18 | E Ink Corporation | Electrophoretic medium with gaseous suspending fluid |
US6920000B2 (en) * | 2002-09-19 | 2005-07-19 | Hewlett-Packard Development Company, L.P. | Filter for a display system |
JP4229714B2 (en) * | 2002-09-19 | 2009-02-25 | 株式会社リコー | Image processing apparatus, image processing method, image processing program, and storage medium for storing image processing program |
US6921175B2 (en) * | 2002-09-19 | 2005-07-26 | Hewlett-Packard Development Company, L.P. | Color-generating device and display system |
US6817717B2 (en) * | 2002-09-19 | 2004-11-16 | Hewlett-Packard Development Company, L.P. | Display system with low and high resolution modulators |
EP1554713B1 (en) * | 2002-10-10 | 2010-08-25 | Koninklijke Philips Electronics N.V. | Electrophoretic display panel |
US20130063333A1 (en) | 2002-10-16 | 2013-03-14 | E Ink Corporation | Electrophoretic displays |
CN1714383A (en) * | 2002-11-22 | 2005-12-28 | 皇家飞利浦电子股份有限公司 | Electrophoretic display panel |
TWI297089B (en) * | 2002-11-25 | 2008-05-21 | Sipix Imaging Inc | A composition for the preparation of microcups used in a liquid crystal display, a liquid crystal display comprising two or more layers of microcup array and process for its manufacture |
US8023071B2 (en) * | 2002-11-25 | 2011-09-20 | Sipix Imaging, Inc. | Transmissive or reflective liquid crystal display |
CN1726428A (en) | 2002-12-16 | 2006-01-25 | 伊英克公司 | Backplanes for electro-optic displays |
US7050040B2 (en) * | 2002-12-18 | 2006-05-23 | Xerox Corporation | Switching of two-particle electrophoretic display media with a combination of AC and DC electric field for contrast enhancement |
US6922276B2 (en) * | 2002-12-23 | 2005-07-26 | E Ink Corporation | Flexible electro-optic displays |
EP1590789A1 (en) * | 2003-01-23 | 2005-11-02 | Koninklijke Philips Electronics N.V. | Driving an electrophoretic display |
KR20050092780A (en) * | 2003-01-23 | 2005-09-22 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | Driving a bi-stable matrix display device |
WO2004066257A1 (en) * | 2003-01-23 | 2004-08-05 | Koninklijke Philips Electronics N.V. | Driving an electrophoretic display |
KR20050092779A (en) * | 2003-01-23 | 2005-09-22 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | Driving a bi-stable matrix display device |
AU2003233105A1 (en) * | 2003-01-23 | 2004-08-13 | Koninklijke Philips Electronics N.V. | Electrophoretic display device and driving method therefor |
TWI299101B (en) | 2003-01-30 | 2008-07-21 | Sipix Imaging Inc | High performance capsules for electrophoretic displays |
US6987603B2 (en) | 2003-01-31 | 2006-01-17 | E Ink Corporation | Construction of electrophoretic displays |
KR20050109962A (en) * | 2003-03-07 | 2005-11-22 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | Electrophoretic display panel |
US7910175B2 (en) | 2003-03-25 | 2011-03-22 | E Ink Corporation | Processes for the production of electrophoretic displays |
US7339715B2 (en) | 2003-03-25 | 2008-03-04 | E Ink Corporation | Processes for the production of electrophoretic displays |
WO2004088395A2 (en) | 2003-03-27 | 2004-10-14 | E Ink Corporation | Electro-optic assemblies |
US10726798B2 (en) | 2003-03-31 | 2020-07-28 | E Ink Corporation | Methods for operating electro-optic displays |
WO2004099862A2 (en) | 2003-05-02 | 2004-11-18 | E Ink Corporation | Electrophoretic displays |
CN100412936C (en) * | 2003-05-02 | 2008-08-20 | 伊英克公司 | Electrophoretic displays |
JP2004333864A (en) | 2003-05-07 | 2004-11-25 | Canon Inc | Electrophoretic display device |
KR20060018221A (en) * | 2003-05-16 | 2006-02-28 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | Electrophoretic display panel |
US20060119615A1 (en) * | 2003-06-17 | 2006-06-08 | Koninklijke Philips Electronics N.V. | Usage mode for an electronic book |
JP5904690B2 (en) | 2003-06-30 | 2016-04-20 | イー インク コーポレイション | Method for driving an electro-optic display |
US8174490B2 (en) | 2003-06-30 | 2012-05-08 | E Ink Corporation | Methods for driving electrophoretic displays |
CN100559444C (en) * | 2003-07-03 | 2009-11-11 | 皇家飞利浦电子股份有限公司 | Reduce the electrophoretic display device (EPD) of residual voltage by the feature of selecting inter-picture potential difference |
WO2005006296A1 (en) * | 2003-07-11 | 2005-01-20 | Koninklijke Philips Electronics, N.V. | Driving scheme for a bi-stable display with improved greyscale accuracy |
JP4246000B2 (en) * | 2003-07-14 | 2009-04-02 | 株式会社 日立ディスプレイズ | Image display device |
KR20060033791A (en) * | 2003-07-15 | 2006-04-19 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | Electrophoretic display panel |
KR20060063880A (en) * | 2003-07-17 | 2006-06-12 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | Electrophoretic or bi-stable display device and driving method therefor |
WO2005010598A2 (en) | 2003-07-24 | 2005-02-03 | E Ink Corporation | Electro-optic displays |
JP2005049657A (en) * | 2003-07-29 | 2005-02-24 | Tdk Corp | Display device |
EP1662305B1 (en) * | 2003-08-07 | 2012-01-25 | Bridgestone Corporation | Image display panel manufacturing method |
JP4806634B2 (en) | 2003-08-19 | 2011-11-02 | イー インク コーポレイション | Electro-optic display and method for operating an electro-optic display |
WO2005020202A1 (en) * | 2003-08-22 | 2005-03-03 | Koninklijke Philips Electronics N.V. | Electrophoretic display panel |
US8531389B2 (en) * | 2003-08-22 | 2013-09-10 | Adrea, LLC | Electrophoretic display panel using shake and reset pulses |
TW200511178A (en) * | 2003-08-25 | 2005-03-16 | Koninkl Philips Electronics Nv | Method of compensating image instability and improving greyscale accuracy for electrophoretic displays |
KR20060135601A (en) * | 2003-08-27 | 2006-12-29 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | Method and apparatus for updating sub-pictures in a bi-stable electronic reading device |
KR20060066740A (en) | 2003-09-08 | 2006-06-16 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | Driving method for an electrophoretic display with accurate greyscale and minimized average power consumption |
US7623113B2 (en) * | 2003-09-12 | 2009-11-24 | Koninklijke Philips Electronics N.V. | Method of compensating temperature dependence of driving schemes for electrophoretic displays |
WO2005029458A1 (en) | 2003-09-19 | 2005-03-31 | E Ink Corporation | Methods for reducing edge effects in electro-optic displays |
JP2007507727A (en) * | 2003-09-29 | 2007-03-29 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Bistable display with proper gradation and natural image updates |
US20060290652A1 (en) * | 2003-09-29 | 2006-12-28 | Guofu Zhou | Driving scheme for monochrome mode and transition method for monochrome-to-greyscale mode in bi-stable displays |
US8319759B2 (en) | 2003-10-08 | 2012-11-27 | E Ink Corporation | Electrowetting displays |
DE602004016017D1 (en) | 2003-10-08 | 2008-10-02 | E Ink Corp | ELECTRO-wetting DISPLAYS |
US7672040B2 (en) | 2003-11-05 | 2010-03-02 | E Ink Corporation | Electro-optic displays, and materials for use therein |
US7551346B2 (en) | 2003-11-05 | 2009-06-23 | E Ink Corporation | Electro-optic displays, and materials for use therein |
US20110164301A1 (en) | 2003-11-05 | 2011-07-07 | E Ink Corporation | Electro-optic displays, and materials for use therein |
US8177942B2 (en) | 2003-11-05 | 2012-05-15 | E Ink Corporation | Electro-optic displays, and materials for use therein |
JP5337344B2 (en) | 2003-11-05 | 2013-11-06 | イー インク コーポレイション | Electro-optic display |
US8928562B2 (en) | 2003-11-25 | 2015-01-06 | E Ink Corporation | Electro-optic displays, and methods for driving same |
JP4790622B2 (en) | 2003-11-26 | 2011-10-12 | イー インク コーポレイション | Low residual voltage electro-optic display |
JP2005182687A (en) | 2003-12-24 | 2005-07-07 | Canon Inc | Device for executing at least either of display and input |
US7206119B2 (en) | 2003-12-31 | 2007-04-17 | E Ink Corporation | Electro-optic displays, and method for driving same |
WO2005065340A2 (en) * | 2003-12-31 | 2005-07-21 | E Ink Corporation | Electro-optic displays |
US6977766B2 (en) * | 2004-01-14 | 2005-12-20 | Hewlett-Packard Development Company, L.P. | Display device with side-illuminated cell |
US7075703B2 (en) | 2004-01-16 | 2006-07-11 | E Ink Corporation | Process for sealing electro-optic displays |
WO2005086131A1 (en) * | 2004-02-24 | 2005-09-15 | Koninklijke Philips Electronics N.V. | Electrophoretic display device |
US7388572B2 (en) | 2004-02-27 | 2008-06-17 | E Ink Corporation | Backplanes for electro-optic displays |
KR20070007298A (en) * | 2004-03-01 | 2007-01-15 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | Transition between grayscale and monochrome addressing of an electrophoretic display |
US6970285B2 (en) * | 2004-03-02 | 2005-11-29 | Hewlett-Packard Development Company, L.P. | Phase change electrophoretic imaging for rewritable applications |
KR20060128021A (en) * | 2004-03-25 | 2006-12-13 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | An electrophoretic display with uniform image stability regardless of the initial optical states |
US7118838B2 (en) * | 2004-03-26 | 2006-10-10 | Brother International Corporation | Method, apparatus and media for displaying information |
US7492339B2 (en) | 2004-03-26 | 2009-02-17 | E Ink Corporation | Methods for driving bistable electro-optic displays |
TW200601217A (en) * | 2004-03-30 | 2006-01-01 | Koninkl Philips Electronics Nv | An electrophoretic display with reduced cross talk |
US8289250B2 (en) | 2004-03-31 | 2012-10-16 | E Ink Corporation | Methods for driving electro-optic displays |
US7602369B2 (en) * | 2004-05-04 | 2009-10-13 | Sharp Laboratories Of America, Inc. | Liquid crystal display with colored backlight |
US20050248553A1 (en) * | 2004-05-04 | 2005-11-10 | Sharp Laboratories Of America, Inc. | Adaptive flicker and motion blur control |
US7505018B2 (en) * | 2004-05-04 | 2009-03-17 | Sharp Laboratories Of America, Inc. | Liquid crystal display with reduced black level insertion |
US8395577B2 (en) * | 2004-05-04 | 2013-03-12 | Sharp Laboratories Of America, Inc. | Liquid crystal display with illumination control |
US7612757B2 (en) * | 2004-05-04 | 2009-11-03 | Sharp Laboratories Of America, Inc. | Liquid crystal display with modulated black point |
US7777714B2 (en) * | 2004-05-04 | 2010-08-17 | Sharp Laboratories Of America, Inc. | Liquid crystal display with adaptive width |
US7532192B2 (en) * | 2004-05-04 | 2009-05-12 | Sharp Laboratories Of America, Inc. | Liquid crystal display with filtered black point |
US7872631B2 (en) * | 2004-05-04 | 2011-01-18 | Sharp Laboratories Of America, Inc. | Liquid crystal display with temporal black point |
US20050253777A1 (en) * | 2004-05-12 | 2005-11-17 | E Ink Corporation | Tiled displays and methods for driving same |
US7023451B2 (en) * | 2004-06-14 | 2006-04-04 | Sharp Laboratories Of America, Inc. | System for reducing crosstalk |
EP1774504B1 (en) * | 2004-07-27 | 2014-02-19 | Adrea LLC | Improved scrolling function in an electrophoretic display device |
WO2006015044A1 (en) | 2004-07-27 | 2006-02-09 | E Ink Corporation | Electro-optic displays |
US20080136774A1 (en) | 2004-07-27 | 2008-06-12 | E Ink Corporation | Methods for driving electrophoretic displays using dielectrophoretic forces |
US11250794B2 (en) | 2004-07-27 | 2022-02-15 | E Ink Corporation | Methods for driving electrophoretic displays using dielectrophoretic forces |
US7453445B2 (en) | 2004-08-13 | 2008-11-18 | E Ink Corproation | Methods for driving electro-optic displays |
US7142350B2 (en) * | 2004-10-07 | 2006-11-28 | Hewlett-Packard Development Company, L.P. | Color whiteboard stylus and display |
US20070085819A1 (en) * | 2004-10-14 | 2007-04-19 | Koninklijke Philips Electronics, N.V. | Look-up tables with graylevel transition waveforms for bi-stable display |
US7898519B2 (en) * | 2005-02-17 | 2011-03-01 | Sharp Laboratories Of America, Inc. | Method for overdriving a backlit display |
US8050511B2 (en) * | 2004-11-16 | 2011-11-01 | Sharp Laboratories Of America, Inc. | High dynamic range images from low dynamic range images |
US7525528B2 (en) * | 2004-11-16 | 2009-04-28 | Sharp Laboratories Of America, Inc. | Technique that preserves specular highlights |
US8050512B2 (en) | 2004-11-16 | 2011-11-01 | Sharp Laboratories Of America, Inc. | High dynamic range images from low dynamic range images |
WO2006061730A1 (en) * | 2004-12-06 | 2006-06-15 | Koninklijke Philips Electronics N.V. | Passive matrix electrophoretic display with reset |
JP2008521065A (en) | 2005-01-26 | 2008-06-19 | イー インク コーポレイション | Electrophoretic display using gaseous fluid |
KR100629207B1 (en) * | 2005-03-11 | 2006-09-27 | 주식회사 동진쎄미켐 | Light Blocking Display Driven by Electric Field |
JP4581786B2 (en) * | 2005-03-28 | 2010-11-17 | セイコーエプソン株式会社 | Electrophoretic display device, manufacturing method thereof, and electronic apparatus |
CN101203900A (en) * | 2005-05-23 | 2008-06-18 | 皇家飞利浦电子股份有限公司 | Fast and interruptible drive scheme for electrophoretic displays |
JP4765418B2 (en) * | 2005-06-08 | 2011-09-07 | カシオ計算機株式会社 | Display device |
JP4765417B2 (en) * | 2005-06-08 | 2011-09-07 | カシオ計算機株式会社 | Display device |
WO2007031915A2 (en) * | 2005-09-13 | 2007-03-22 | Koninklijke Philips Electronics N.V. | Electrophoretic display devices |
EP1938299A4 (en) | 2005-10-18 | 2010-11-24 | E Ink Corp | Components for electro-optic displays |
US20080043318A1 (en) * | 2005-10-18 | 2008-02-21 | E Ink Corporation | Color electro-optic displays, and processes for the production thereof |
US20070091417A1 (en) * | 2005-10-25 | 2007-04-26 | E Ink Corporation | Electrophoretic media and displays with improved binder |
US8121401B2 (en) * | 2006-01-24 | 2012-02-21 | Sharp Labortories of America, Inc. | Method for reducing enhancement of artifacts and noise in image color enhancement |
US9143657B2 (en) * | 2006-01-24 | 2015-09-22 | Sharp Laboratories Of America, Inc. | Color enhancement technique using skin color detection |
JP4760426B2 (en) * | 2006-02-13 | 2011-08-31 | ソニー株式会社 | Optical element and lens array |
US8390301B2 (en) | 2006-03-08 | 2013-03-05 | E Ink Corporation | Electro-optic displays, and materials and methods for production thereof |
US7843624B2 (en) | 2006-03-08 | 2010-11-30 | E Ink Corporation | Electro-optic displays, and materials and methods for production thereof |
US7733554B2 (en) | 2006-03-08 | 2010-06-08 | E Ink Corporation | Electro-optic displays, and materials and methods for production thereof |
US8610988B2 (en) | 2006-03-09 | 2013-12-17 | E Ink Corporation | Electro-optic display with edge seal |
US7746541B2 (en) * | 2006-03-13 | 2010-06-29 | Honeywell International Inc. | System and apparatus for an electrophoretic display |
US7952790B2 (en) | 2006-03-22 | 2011-05-31 | E Ink Corporation | Electro-optic media produced using ink jet printing |
US7492504B2 (en) * | 2006-05-19 | 2009-02-17 | Xerox Corporation | Electrophoretic display medium and device |
US7502161B2 (en) | 2006-05-19 | 2009-03-10 | Xerox Corporation | Electrophoretic display medium and device |
US7344750B2 (en) | 2006-05-19 | 2008-03-18 | Xerox Corporation | Electrophoretic display device |
US7426074B2 (en) * | 2006-05-19 | 2008-09-16 | Xerox Corporation | Electrophoretic display medium and display device |
US7440159B2 (en) | 2006-05-19 | 2008-10-21 | Xerox Corporation | Electrophoretic display and method of displaying images |
US7382521B2 (en) | 2006-05-19 | 2008-06-03 | Xerox Corporation | Electrophoretic display device |
US7345810B2 (en) * | 2006-05-19 | 2008-03-18 | Xerox Corporation | Electrophoretic display and method of displaying images |
US7417787B2 (en) * | 2006-05-19 | 2008-08-26 | Xerox Corporation | Electrophoretic display device |
US7280266B1 (en) | 2006-05-19 | 2007-10-09 | Xerox Corporation | Electrophoretic display medium and device |
US7298543B1 (en) | 2006-05-19 | 2007-11-20 | Xerox Corporation | Electrophoretic display and method of displaying images |
US7433113B2 (en) * | 2006-05-19 | 2008-10-07 | Xerox Corporation | Electrophoretic display medium and device |
US7403325B2 (en) | 2006-05-19 | 2008-07-22 | Xerox Corporation | Electrophoretic display device |
US7652656B2 (en) * | 2006-05-19 | 2010-01-26 | Xerox Corporation | Electrophoretic display and method of displaying images |
US7443570B2 (en) | 2006-05-19 | 2008-10-28 | Xerox Corporation | Electrophoretic display medium and device |
US7430073B2 (en) | 2006-05-19 | 2008-09-30 | Xerox Corporation | Electrophoretic display device and method of displaying image |
US7685967B2 (en) | 2006-05-23 | 2010-03-30 | Seed Resources, Llc | Feed cake assembly |
US7349147B2 (en) * | 2006-06-23 | 2008-03-25 | Xerox Corporation | Electrophoretic display medium containing solvent resistant emulsion aggregation particles |
US7903319B2 (en) | 2006-07-11 | 2011-03-08 | E Ink Corporation | Electrophoretic medium and display with improved image stability |
US8018640B2 (en) | 2006-07-13 | 2011-09-13 | E Ink Corporation | Particles for use in electrophoretic displays |
US20080024429A1 (en) * | 2006-07-25 | 2008-01-31 | E Ink Corporation | Electrophoretic displays using gaseous fluids |
US7492497B2 (en) | 2006-08-02 | 2009-02-17 | E Ink Corporation | Multi-layer light modulator |
WO2008036519A2 (en) | 2006-09-18 | 2008-03-27 | E Ink Corporation | Color electro-optic displays |
US7307779B1 (en) | 2006-09-21 | 2007-12-11 | Honeywell International, Inc. | Transmissive E-paper display |
US7477444B2 (en) | 2006-09-22 | 2009-01-13 | E Ink Corporation & Air Products And Chemical, Inc. | Electro-optic display and materials for use therein |
US8623191B2 (en) * | 2006-09-22 | 2014-01-07 | Honeywell International Inc. | Non-volatile addressable electronic paper with gray level capability |
US7986450B2 (en) | 2006-09-22 | 2011-07-26 | E Ink Corporation | Electro-optic display and materials for use therein |
US7675672B2 (en) * | 2006-11-09 | 2010-03-09 | Honeywell International Inc. | Non-volatile addressable electronic paper for disposable flexible displays |
US7843623B2 (en) * | 2006-11-16 | 2010-11-30 | Honeywell International Inc. | Non volatile addressable electronic paper with color capability |
KR20090082241A (en) * | 2006-11-21 | 2009-07-29 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | Switchable grating based on electrophoretic particle system |
US8941580B2 (en) * | 2006-11-30 | 2015-01-27 | Sharp Laboratories Of America, Inc. | Liquid crystal display with area adaptive backlight |
US7649666B2 (en) | 2006-12-07 | 2010-01-19 | E Ink Corporation | Components and methods for use in electro-optic displays |
US7688497B2 (en) | 2007-01-22 | 2010-03-30 | E Ink Corporation | Multi-layer sheet for use in electro-optic displays |
WO2008091850A2 (en) | 2007-01-22 | 2008-07-31 | E Ink Corporation | Multi-layer sheet for use in electro-optic displays |
JP5002656B2 (en) * | 2007-02-01 | 2012-08-15 | ドルビー ラボラトリーズ ライセンシング コーポレイション | Calibration of displays with spatially varying backlights |
US7826129B2 (en) | 2007-03-06 | 2010-11-02 | E Ink Corporation | Materials for use in electrophoretic displays |
KR20090130211A (en) | 2007-05-21 | 2009-12-18 | 이 잉크 코포레이션 | Methods for driving video electro-optic displays |
US9199441B2 (en) | 2007-06-28 | 2015-12-01 | E Ink Corporation | Processes for the production of electro-optic displays, and color filters for use therein |
WO2009006248A1 (en) | 2007-06-29 | 2009-01-08 | E Ink Corporation | Electro-optic displays, and materials and methods for production thereof |
US20090006198A1 (en) * | 2007-06-29 | 2009-01-01 | David George Walsh | Product displays for retail stores |
US8902153B2 (en) | 2007-08-03 | 2014-12-02 | E Ink Corporation | Electro-optic displays, and processes for their production |
US20090122389A1 (en) | 2007-11-14 | 2009-05-14 | E Ink Corporation | Electro-optic assemblies, and adhesives and binders for use therein |
JP2011517490A (en) | 2008-03-21 | 2011-06-09 | イー インク コーポレイション | Electro-optic display and color filter |
WO2009126957A1 (en) | 2008-04-11 | 2009-10-15 | E Ink Corporation | Methods for driving electro-optic displays |
US8373649B2 (en) * | 2008-04-11 | 2013-02-12 | Seiko Epson Corporation | Time-overlapping partial-panel updating of a bistable electro-optic display |
JP2011520137A (en) | 2008-04-14 | 2011-07-14 | イー インク コーポレイション | Method for driving an electro-optic display |
JP5346078B2 (en) * | 2008-05-20 | 2013-11-20 | イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー | Thermal and dimensionally stable polyimide films and methods related thereto |
US20090322800A1 (en) | 2008-06-25 | 2009-12-31 | Dolby Laboratories Licensing Corporation | Method and apparatus in various embodiments for hdr implementation in display devices |
WO2010015979A1 (en) * | 2008-08-07 | 2010-02-11 | Koninklijke Philips Electronics N.V. | A moving particle display device |
TWI395042B (en) | 2008-12-01 | 2013-05-01 | Prime View Int Co Ltd | Sub-pixel structure and pixel structure of color electrophoretic display |
KR101114779B1 (en) * | 2009-01-07 | 2012-03-05 | 삼성전자주식회사 | Method and apparatus for driving electrophoretic display |
US20100177080A1 (en) * | 2009-01-13 | 2010-07-15 | Metrologic Instruments, Inc. | Electronic-ink signage device employing thermal packaging for outdoor weather applications |
US8234507B2 (en) | 2009-01-13 | 2012-07-31 | Metrologic Instruments, Inc. | Electronic-ink display device employing a power switching mechanism automatically responsive to predefined states of device configuration |
US20100177750A1 (en) * | 2009-01-13 | 2010-07-15 | Metrologic Instruments, Inc. | Wireless Diplay sensor communication network |
US20100177076A1 (en) * | 2009-01-13 | 2010-07-15 | Metrologic Instruments, Inc. | Edge-lit electronic-ink display device for use in indoor and outdoor environments |
US8457013B2 (en) | 2009-01-13 | 2013-06-04 | Metrologic Instruments, Inc. | Wireless dual-function network device dynamically switching and reconfiguring from a wireless network router state of operation into a wireless network coordinator state of operation in a wireless communication network |
TWI484273B (en) | 2009-02-09 | 2015-05-11 | E Ink Corp | Electrophoretic particles |
US20100214282A1 (en) | 2009-02-24 | 2010-08-26 | Dolby Laboratories Licensing Corporation | Apparatus for providing light source modulation in dual modulator displays |
US8098418B2 (en) | 2009-03-03 | 2012-01-17 | E. Ink Corporation | Electro-optic displays, and color filters for use therein |
US8018642B2 (en) * | 2009-03-26 | 2011-09-13 | Hewlett-Packard Development Company, L.P. | Electro-optical display |
US9217906B2 (en) | 2009-03-26 | 2015-12-22 | Hewlett-Packard Development Company, L.P. | In-plane electro-optical display |
US8255820B2 (en) | 2009-06-09 | 2012-08-28 | Skiff, Llc | Electronic paper display device event tracking |
US20100318888A1 (en) * | 2009-06-10 | 2010-12-16 | Firstpaper Llc | System and method for providing sub-publication content in an electronic device |
US20110080334A1 (en) * | 2009-10-01 | 2011-04-07 | Jong-Souk Yeo | Visual image display apparatuses and methods |
US20110084979A1 (en) * | 2009-10-09 | 2011-04-14 | Firstpaper Llc | Integrated electronic paper display controller |
US8089686B2 (en) * | 2009-10-14 | 2012-01-03 | Hewlett-Packard Development Company, L.P. | Electronic display device providing static grayscale image |
JP5859447B2 (en) | 2009-10-28 | 2016-02-10 | イー インク コーポレイション | Electro-optic display with touch sensor |
US8654436B1 (en) | 2009-10-30 | 2014-02-18 | E Ink Corporation | Particles for use in electrophoretic displays |
US8358322B2 (en) * | 2009-10-30 | 2013-01-22 | Hewlett-Packard Development Company, L.P. | Display |
US20120231263A1 (en) | 2009-11-20 | 2012-09-13 | E.I. Du Pont De Nemours And Company | Coverlay compositions and methods relating thereto |
US8319299B2 (en) | 2009-11-20 | 2012-11-27 | Auman Brian C | Thin film transistor compositions, and methods relating thereto |
US8089687B2 (en) * | 2009-12-21 | 2012-01-03 | Hewlett-Packard Development Company, L.P. | Electro-optical display systems |
US9620066B2 (en) | 2010-02-02 | 2017-04-11 | E Ink Corporation | Method for driving electro-optic displays |
WO2011123847A2 (en) | 2010-04-02 | 2011-10-06 | E Ink Corporation | Electrophoretic media |
CN105654889B (en) | 2010-04-09 | 2022-01-11 | 伊英克公司 | Method for driving electro-optic display |
TWI484275B (en) * | 2010-05-21 | 2015-05-11 | E Ink Corp | Electro-optic display, method for driving the same and microcavity electrophoretic display |
KR101495414B1 (en) | 2010-06-02 | 2015-02-24 | 이 잉크 코포레이션 | Color electro-optic displays |
US8184357B2 (en) | 2010-06-15 | 2012-05-22 | Hewlett-Packard Development Company, L.P. | Display element |
US8384659B2 (en) | 2010-06-15 | 2013-02-26 | Hewlett-Packard Development Company, L.P. | Display element including electrodes and a fluid with colorant particles |
US8183757B2 (en) | 2010-07-06 | 2012-05-22 | Hewlett-Packard Development Company, L.P. | Display element |
WO2012074792A1 (en) | 2010-11-30 | 2012-06-07 | E Ink Corporation | Multi-color electrophoretic displays |
US8743244B2 (en) | 2011-03-21 | 2014-06-03 | HJ Laboratories, LLC | Providing augmented reality based on third party information |
US8873129B2 (en) | 2011-04-07 | 2014-10-28 | E Ink Corporation | Tetrachromatic color filter array for reflective display |
WO2012162095A2 (en) | 2011-05-21 | 2012-11-29 | E Ink Corporation | Electro-optic displays |
US20130125910A1 (en) | 2011-11-18 | 2013-05-23 | Avon Products, Inc. | Use of Electrophoretic Microcapsules in a Cosmetic Composition |
TWI452553B (en) * | 2011-12-30 | 2014-09-11 | Au Optronics Corp | Method of fabricating flexible display device |
US11030936B2 (en) | 2012-02-01 | 2021-06-08 | E Ink Corporation | Methods and apparatus for operating an electro-optic display in white mode |
KR101702199B1 (en) | 2012-02-01 | 2017-02-03 | 이 잉크 코포레이션 | Methods for driving electro-optic displays |
US9291872B1 (en) * | 2012-02-07 | 2016-03-22 | E Ink California, Llc | Electrophoretic display design |
US11467466B2 (en) | 2012-04-20 | 2022-10-11 | E Ink Corporation | Illumination systems for reflective displays |
US10190743B2 (en) | 2012-04-20 | 2019-01-29 | E Ink Corporation | Illumination systems for reflective displays |
US10282033B2 (en) | 2012-06-01 | 2019-05-07 | E Ink Corporation | Methods for updating electro-optic displays when drawing or writing on the display |
US9513743B2 (en) | 2012-06-01 | 2016-12-06 | E Ink Corporation | Methods for driving electro-optic displays |
EP2877895B1 (en) | 2012-07-27 | 2017-09-06 | E Ink Corporation | Processes for the production of electro-optic displays |
US10037735B2 (en) | 2012-11-16 | 2018-07-31 | E Ink Corporation | Active matrix display with dual driving modes |
US9726957B2 (en) | 2013-01-10 | 2017-08-08 | E Ink Corporation | Electro-optic display with controlled electrochemical reactions |
US9715155B1 (en) | 2013-01-10 | 2017-07-25 | E Ink Corporation | Electrode structures for electro-optic displays |
DE102013114636B4 (en) * | 2013-02-05 | 2017-11-16 | Nvidia Corp. | Flat panel electronic device and associated display panel |
US9436056B2 (en) | 2013-02-06 | 2016-09-06 | E Ink Corporation | Color electro-optic displays |
US9195111B2 (en) | 2013-02-11 | 2015-11-24 | E Ink Corporation | Patterned electro-optic displays and processes for the production thereof |
US9721495B2 (en) | 2013-02-27 | 2017-08-01 | E Ink Corporation | Methods for driving electro-optic displays |
WO2014134504A1 (en) | 2013-03-01 | 2014-09-04 | E Ink Corporation | Methods for driving electro-optic displays |
KR101856834B1 (en) | 2013-05-14 | 2018-05-10 | 이 잉크 코포레이션 | Colored electrophoretic displays |
US9620048B2 (en) | 2013-07-30 | 2017-04-11 | E Ink Corporation | Methods for driving electro-optic displays |
CN107393482A (en) | 2013-07-31 | 2017-11-24 | 伊英克公司 | Method for driving electro-optic displays |
WO2015059029A1 (en) | 2013-10-22 | 2015-04-30 | Vlyte Innovations Limited | A wide operating temperature range electrophoretic device |
CN105917265B (en) | 2014-01-17 | 2019-01-15 | 伊英克公司 | Electro-optic displays with two-phase electrode layer |
WO2015120294A1 (en) | 2014-02-06 | 2015-08-13 | E Ink Corporation | Electrophoretic particles and processes for the production thereof |
US9671635B2 (en) | 2014-02-07 | 2017-06-06 | E Ink Corporation | Electro-optic display backplane structures with drive components and pixel electrodes on opposed surfaces |
US10317767B2 (en) | 2014-02-07 | 2019-06-11 | E Ink Corporation | Electro-optic display backplane structure with drive components and pixel electrodes on opposed surfaces |
US10446585B2 (en) | 2014-03-17 | 2019-10-15 | E Ink Corporation | Multi-layer expanding electrode structures for backplane assemblies |
US9506243B1 (en) | 2014-03-20 | 2016-11-29 | E Ink Corporation | Thermally-responsive film |
US9953588B1 (en) | 2014-03-25 | 2018-04-24 | E Ink Corporation | Nano-particle based variable transmission devices |
KR101824723B1 (en) | 2014-09-10 | 2018-02-02 | 이 잉크 코포레이션 | Colored electrophoretic displays |
US10657869B2 (en) | 2014-09-10 | 2020-05-19 | E Ink Corporation | Methods for driving color electrophoretic displays |
JP6754757B2 (en) | 2014-09-26 | 2020-09-16 | イー インク コーポレイション | Color set for low resolution dithering in reflective color displays |
CA2963561A1 (en) | 2014-11-07 | 2016-05-12 | E Ink Corporation | Applications of electro-optic displays |
US10197883B2 (en) | 2015-01-05 | 2019-02-05 | E Ink Corporation | Electro-optic displays, and methods for driving same |
CN107111201B (en) | 2015-01-05 | 2021-01-29 | 伊英克公司 | Electro-optic display and method for driving an electro-optic display |
US9835925B1 (en) | 2015-01-08 | 2017-12-05 | E Ink Corporation | Electro-optic displays, and processes for the production thereof |
KR102079858B1 (en) | 2015-02-04 | 2020-02-20 | 이 잉크 코포레이션 | Electro-optic displays displaying in dark mode and light mode, and related apparatus and methods |
WO2016126771A1 (en) | 2015-02-04 | 2016-08-11 | E Ink Corporation | Electro-optic displays with reduced remnant voltage, and related apparatus and methods |
US10037089B2 (en) | 2015-02-17 | 2018-07-31 | E Ink Corporation | Electromagnetic writing apparatus for electro-optic displays |
US9880646B2 (en) | 2015-02-18 | 2018-01-30 | E Ink Corporation | Addressable electro-optic display |
CN107771369B (en) | 2015-06-29 | 2021-09-24 | 伊英克公司 | Method for mechanically and electrically connecting to display electrodes |
WO2017004113A1 (en) | 2015-06-30 | 2017-01-05 | E Ink Corporation | Multi-layered electrophoretic displays |
JP2018523727A (en) | 2015-07-23 | 2018-08-23 | イー インク コーポレイション | Polymer formulation for use with electro-optic media |
US11287718B2 (en) | 2015-08-04 | 2022-03-29 | E Ink Corporation | Reusable display addressable with incident light |
EP3345047A1 (en) | 2015-08-31 | 2018-07-11 | E Ink Corporation | Electronically erasing a drawing device |
US10803813B2 (en) | 2015-09-16 | 2020-10-13 | E Ink Corporation | Apparatus and methods for driving displays |
US11657774B2 (en) | 2015-09-16 | 2023-05-23 | E Ink Corporation | Apparatus and methods for driving displays |
KR102158965B1 (en) | 2015-09-16 | 2020-09-23 | 이 잉크 코포레이션 | Apparatus and methods for driving displays |
CN113004854B (en) | 2015-09-30 | 2022-09-30 | 伊英克公司 | Polyurethane adhesive layer for electro-optical assemblies |
JP2018526685A (en) | 2015-10-01 | 2018-09-13 | イー インク コーポレイション | Variable color and permeable coating |
EP3368946B1 (en) | 2015-10-30 | 2021-08-25 | E Ink Corporation | Methods for sealing microcell containers with phenethylamine mixtures |
PT3374435T (en) | 2015-11-11 | 2021-01-08 | E Ink Corp | Functionalized quinacridone pigments |
TWI658312B (en) | 2016-02-08 | 2019-05-01 | 美商電子墨水股份有限公司 | Methods and apparatus for operating an electro-optic display in white mode |
US10254620B1 (en) | 2016-03-08 | 2019-04-09 | E Ink Corporation | Encapsulated photoelectrophoretic display |
JP6739540B2 (en) | 2016-03-09 | 2020-08-12 | イー インク コーポレイション | Method for driving an electro-optical display |
US10593272B2 (en) | 2016-03-09 | 2020-03-17 | E Ink Corporation | Drivers providing DC-balanced refresh sequences for color electrophoretic displays |
US10545622B2 (en) | 2016-05-20 | 2020-01-28 | E Ink Corporation | Magnetically-responsive display including a recording layer configured for local and global write/erase |
WO2017209869A2 (en) | 2016-05-31 | 2017-12-07 | E Ink Corporation | Stretchable electro-optic displays |
JP6660514B2 (en) | 2016-08-08 | 2020-03-11 | イー インク コーポレイション | Wearable device with flexible electrophoretic display |
CN110383370B (en) | 2017-03-03 | 2022-07-12 | 伊英克公司 | Electro-optic display and driving method |
WO2018164942A1 (en) | 2017-03-06 | 2018-09-13 | E Ink Corporation | Method for rendering color images |
CN115410535A (en) | 2017-03-09 | 2022-11-29 | 伊英克公司 | Driver for providing DC balance update sequence for color electrophoretic display |
US10444592B2 (en) | 2017-03-09 | 2019-10-15 | E Ink Corporation | Methods and systems for transforming RGB image data to a reduced color set for electro-optic displays |
CN115148163B (en) | 2017-04-04 | 2023-09-05 | 伊英克公司 | Method for driving electro-optic display |
US11404013B2 (en) | 2017-05-30 | 2022-08-02 | E Ink Corporation | Electro-optic displays with resistors for discharging remnant charges |
JP2020522741A (en) | 2017-05-30 | 2020-07-30 | イー インク コーポレイション | Electro-optic display |
EP4086318A3 (en) | 2017-06-16 | 2023-01-18 | E Ink Corporation | Variable transmission electrophoretic devices |
WO2018232099A1 (en) | 2017-06-16 | 2018-12-20 | E Ink Corporation | Electro-optic media including encapsulated pigments in gelatin binder |
US10802373B1 (en) | 2017-06-26 | 2020-10-13 | E Ink Corporation | Reflective microcells for electrophoretic displays and methods of making the same |
US10921676B2 (en) | 2017-08-30 | 2021-02-16 | E Ink Corporation | Electrophoretic medium |
WO2019055486A1 (en) | 2017-09-12 | 2019-03-21 | E Ink Corporation | Methods for driving electro-optic displays |
US11721295B2 (en) | 2017-09-12 | 2023-08-08 | E Ink Corporation | Electro-optic displays, and methods for driving same |
US10824042B1 (en) | 2017-10-27 | 2020-11-03 | E Ink Corporation | Electro-optic display and composite materials having low thermal sensitivity for use therein |
KR20210151997A (en) | 2017-11-03 | 2021-12-14 | 이 잉크 코포레이션 | Processes for producing electro-optic displays |
US11079651B2 (en) | 2017-12-15 | 2021-08-03 | E Ink Corporation | Multi-color electro-optic media |
JP2021507293A (en) | 2017-12-19 | 2021-02-22 | イー インク コーポレイション | Application of electro-optical display |
US11248122B2 (en) | 2017-12-30 | 2022-02-15 | E Ink Corporation | Pigments for electrophoretic displays |
JP2021511542A (en) | 2018-01-22 | 2021-05-06 | イー インク コーポレイション | Electro-optic displays and how to drive them |
WO2019160841A1 (en) | 2018-02-15 | 2019-08-22 | E Ink Corporation | Via placement for slim border electro-optic display backplanes with decreased capacitive coupling between t-wires and pixel electrodes |
US11143929B2 (en) | 2018-03-09 | 2021-10-12 | E Ink Corporation | Reflective electrophoretic displays including photo-luminescent material and color filter arrays |
US11175561B1 (en) | 2018-04-12 | 2021-11-16 | E Ink Corporation | Electrophoretic display media with network electrodes and methods of making and using the same |
WO2019209240A1 (en) | 2018-04-23 | 2019-10-31 | E Ink Corporation | Nano-particle based variable transmission devices |
TWI746193B (en) | 2018-05-17 | 2021-11-11 | 美商伊英克加利福尼亞有限責任公司 | Electro-optic display |
EP3814836B1 (en) | 2018-06-28 | 2024-04-03 | E Ink Corporation | Driving methods for variable transmission electro-phoretic media |
RU2770317C1 (en) | 2018-07-17 | 2022-04-15 | Е Инк Калифорния, Ллс | Electrooptical displays and methods of their excitation |
US11493821B2 (en) | 2018-08-14 | 2022-11-08 | E Ink California, Llc | Piezo electrophoretic display |
CA3055573A1 (en) * | 2018-09-13 | 2020-03-13 | Newtonoid Technologies, L.L.C. | Static programmable electro-chromic fishing lure |
US11754903B1 (en) | 2018-11-16 | 2023-09-12 | E Ink Corporation | Electro-optic assemblies and materials for use therein |
US11062663B2 (en) | 2018-11-30 | 2021-07-13 | E Ink California, Llc | Electro-optic displays and driving methods |
CN113056703A (en) | 2018-11-30 | 2021-06-29 | 伊英克公司 | Pressure-sensitive writing medium containing electrophoretic material |
US11402719B2 (en) | 2018-12-11 | 2022-08-02 | E Ink Corporation | Retroreflective electro-optic displays |
WO2020123741A1 (en) | 2018-12-12 | 2020-06-18 | E Ink Corporation | Edible electrodes and uses in electro-optic displays |
WO2020122917A1 (en) | 2018-12-13 | 2020-06-18 | E Ink Corporation | Illumination systems for reflective displays |
US10823373B2 (en) | 2018-12-17 | 2020-11-03 | E Ink Corporation | Light emitting device including variable transmission film to control intensity and pattern |
KR102610376B1 (en) | 2018-12-21 | 2023-12-05 | 이 잉크 코포레이션 | Sub-threshold addressing and erasure in magnetoelectrophoretic writing media. |
CN113330365A (en) | 2019-02-25 | 2021-08-31 | 伊英克公司 | Composite electrophoretic particles and variable transmission film containing the same |
US11456397B2 (en) | 2019-03-12 | 2022-09-27 | E Ink Corporation | Energy harvesting electro-optic displays |
JP7335356B2 (en) | 2019-05-07 | 2023-08-29 | イー インク コーポレイション | Driving method for variable light transmission device |
US11460722B2 (en) | 2019-05-10 | 2022-10-04 | E Ink Corporation | Colored electrophoretic displays |
WO2021016930A1 (en) * | 2019-07-31 | 2021-02-04 | 京东方科技集团股份有限公司 | Electronic paper, display device, and driving method |
US11761123B2 (en) | 2019-08-07 | 2023-09-19 | E Ink Corporation | Switching ribbons for textiles |
JP7232379B2 (en) | 2019-08-08 | 2023-03-02 | イー インク コーポレイション | Stylus for addressing magnetically actuated display media |
WO2021040917A1 (en) | 2019-08-26 | 2021-03-04 | E Ink Corporation | Electro-optic device comprising an identification marker |
GB201914105D0 (en) | 2019-09-30 | 2019-11-13 | Vlyte Innovations Ltd | A see-through electrophoretic device having a visible grid |
US11827816B2 (en) | 2019-10-07 | 2023-11-28 | E Ink Corporation | Adhesive composition comprising a polyurethane and a cationic dopant |
CN114641820B (en) | 2019-11-14 | 2024-01-05 | 伊英克公司 | Method for driving electro-optic display |
CN114641723A (en) | 2019-11-14 | 2022-06-17 | 伊英克公司 | Electro-optic medium comprising oppositely charged particles and variable transmission device comprising the same |
JP2022553872A (en) | 2019-11-18 | 2022-12-26 | イー インク コーポレイション | How to drive an electro-optic display |
CN110824806B (en) * | 2019-11-28 | 2023-06-23 | 京东方科技集团股份有限公司 | Electronic ink screen and display device |
EP4078276A1 (en) | 2019-12-17 | 2022-10-26 | E Ink Corporation | Autostereoscopic devices and methods for producing 3d images |
KR20220103788A (en) | 2019-12-23 | 2022-07-22 | 이 잉크 코포레이션 | Color electrophoretic layer containing microcapsules with non-ionic polymer walls |
KR20220092951A (en) | 2019-12-23 | 2022-07-04 | 이 잉크 코포레이션 | Transferable Translucent Electrode Film for Electro-Optical Device |
CA3163699A1 (en) | 2020-02-07 | 2021-08-12 | E Ink Corporation | Electrophoretic display layer with thin film top electrode |
GB2593150A (en) | 2020-03-05 | 2021-09-22 | Vlyte Ltd | A light modulator having bonded structures embedded in its viewing area |
KR20230003578A (en) | 2020-05-31 | 2023-01-06 | 이 잉크 코포레이션 | Electro-optical displays and methods for driving them |
EP4165623A1 (en) | 2020-06-11 | 2023-04-19 | E Ink Corporation | Electro-optic displays, and methods for driving same |
JP2023540293A (en) * | 2020-09-08 | 2023-09-22 | イー インク コーポレイション | Reflective microcells and their fabrication methods for electrophoretic displays |
TWI757867B (en) * | 2020-09-10 | 2022-03-11 | 美商電子墨水股份有限公司 | Polymeric film |
US11846863B2 (en) | 2020-09-15 | 2023-12-19 | E Ink Corporation | Coordinated top electrode—drive electrode voltages for switching optical state of electrophoretic displays using positive and negative voltages of different magnitudes |
EP4214573A1 (en) | 2020-09-15 | 2023-07-26 | E Ink Corporation | Improved driving voltages for advanced color electrophoretic displays and displays with improved driving voltages |
JP2023541843A (en) | 2020-09-15 | 2023-10-04 | イー インク コーポレイション | Four-particle electrophoretic medium provides fast, high-contrast optical state switching |
JP2023544146A (en) | 2020-10-01 | 2023-10-20 | イー インク コーポレイション | Electro-optical display and method for driving it |
CN116490916A (en) | 2020-11-02 | 2023-07-25 | 伊英克公司 | Method for reducing image artifacts during partial updating of an electrophoretic display |
WO2022094384A1 (en) | 2020-11-02 | 2022-05-05 | E Ink Corporation | Enhanced push-pull (epp) waveforms for achieving primary color sets in multi-color electrophoretic displays |
EP4237909A1 (en) | 2020-11-02 | 2023-09-06 | E Ink Corporation | Driving sequences to remove prior state information from color electrophoretic displays |
EP4260312A1 (en) | 2020-12-08 | 2023-10-18 | E Ink Corporation | Methods for driving electro-optic displays |
TW202314665A (en) | 2021-08-18 | 2023-04-01 | 美商電子墨水股份有限公司 | Methods for driving electro-optic displays |
WO2023043714A1 (en) | 2021-09-14 | 2023-03-23 | E Ink Corporation | Coordinated top electrode - drive electrode voltages for switching optical state of electrophoretic displays using positive and negative voltages of different magnitudes |
US11830448B2 (en) | 2021-11-04 | 2023-11-28 | E Ink Corporation | Methods for driving electro-optic displays |
US20230197024A1 (en) | 2021-12-22 | 2023-06-22 | E Ink Corporation | Methods for driving electro-optic displays |
WO2023121901A1 (en) | 2021-12-22 | 2023-06-29 | E Ink Corporation | High voltage driving using top plane switching with zero voltage frames between driving frames |
US11854448B2 (en) | 2021-12-27 | 2023-12-26 | E Ink Corporation | Methods for measuring electrical properties of electro-optic displays |
TW202341123A (en) | 2021-12-30 | 2023-10-16 | 美商伊英克加利福尼亞有限責任公司 | Methods for driving electro-optic displays |
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Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1031474B (en) * | 1974-02-12 | 1979-04-30 | Plessey Handel Investment Ag | WORKING FLUID FOR ELECTROPHORETIC DEVICES FOR VISUAL IMAGE TAKING |
US4648956A (en) * | 1984-12-31 | 1987-03-10 | North American Philips Corporation | Electrode configurations for an electrophoretic display device |
JPH0353224A (en) * | 1989-07-21 | 1991-03-07 | Toyota Motor Corp | Electrophoretic display element |
JPH0823644B2 (en) * | 1989-09-04 | 1996-03-06 | トヨタ自動車株式会社 | Driving method for electrophoretic display device |
JP2705235B2 (en) * | 1989-09-08 | 1998-01-28 | トヨタ自動車株式会社 | Driving method of electrophoretic display element |
JPH04307523A (en) * | 1991-04-05 | 1992-10-29 | Toyota Motor Corp | Electrophoretic display element |
JP2768043B2 (en) * | 1991-05-23 | 1998-06-25 | トヨタ自動車株式会社 | Transmissive electrophoretic display |
US5699097A (en) * | 1994-04-22 | 1997-12-16 | Kabushiki Kaisha Toshiba | Display medium and method for display therewith |
US6017584A (en) * | 1995-07-20 | 2000-01-25 | E Ink Corporation | Multi-color electrophoretic displays and materials for making the same |
US5582700A (en) * | 1995-10-16 | 1996-12-10 | Zikon Corporation | Electrophoretic display utilizing phase separation of liquids |
ATE356369T1 (en) * | 1996-07-19 | 2007-03-15 | E Ink Corp | ELECTRONICALLY ADDRESSABLE MICRO-ENCAPSULED INK |
US5961804A (en) * | 1997-03-18 | 1999-10-05 | Massachusetts Institute Of Technology | Microencapsulated electrophoretic display |
ATE280963T1 (en) * | 1997-08-28 | 2004-11-15 | E Ink Corp | NEW ADDRESSING CIRCUIT FOR ELECTROPHORETIC DISPLAY DEVICES |
US5967750A (en) * | 1997-10-10 | 1999-10-19 | Elliott; Morris C. | Variable pitch marine propeller |
EP1075670B1 (en) * | 1998-04-27 | 2008-12-17 | E-Ink Corporation | Shutter mode microencapsulated electrophoretic display |
-
1999
- 1999-04-27 EP EP99920099A patent/EP1075670B1/en not_active Expired - Lifetime
- 1999-04-27 CA CA002329173A patent/CA2329173A1/en not_active Abandoned
- 1999-04-27 DE DE69940112T patent/DE69940112D1/en not_active Expired - Lifetime
- 1999-04-27 AU AU37678/99A patent/AU3767899A/en not_active Abandoned
- 1999-04-27 JP JP2000546273A patent/JP2002513169A/en active Pending
- 1999-04-27 US US09/300,585 patent/US6130774A/en not_active Expired - Lifetime
- 1999-04-27 WO PCT/US1999/009172 patent/WO1999056171A1/en active Application Filing
-
2000
- 2000-05-15 US US09/571,631 patent/US6172798B1/en not_active Expired - Lifetime
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WO1999056171A1 (en) | 1999-11-04 |
DE69940112D1 (en) | 2009-01-29 |
AU3767899A (en) | 1999-11-16 |
EP1075670A1 (en) | 2001-02-14 |
EP1075670B1 (en) | 2008-12-17 |
JP2002513169A (en) | 2002-05-08 |
US6130774A (en) | 2000-10-10 |
US6172798B1 (en) | 2001-01-09 |
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