WO2005101106A1 - Transflective lcd display device - Google Patents
Transflective lcd display device Download PDFInfo
- Publication number
- WO2005101106A1 WO2005101106A1 PCT/IB2005/051154 IB2005051154W WO2005101106A1 WO 2005101106 A1 WO2005101106 A1 WO 2005101106A1 IB 2005051154 W IB2005051154 W IB 2005051154W WO 2005101106 A1 WO2005101106 A1 WO 2005101106A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light
- partial mirror
- apertures
- polarizer
- backlight system
- Prior art date
Links
Classifications
-
- 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133553—Reflecting elements
- G02F1/133555—Transflectors
-
- 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
-
- 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
- G02F1/133538—Polarisers with spatial distribution of the polarisation direction
Definitions
- the invention relates to a transflective liquid crystal display (LCD) device.
- LCD liquid crystal display
- LCDs Liquid Crystal Displays
- LCDs are increasingly used in computer monitors, television sets, handheld devices et cetera.
- -LCDs have become the standard display device due to low power consumption, reliability and low price.
- the operation of LCDs is based on light modulation in an active layer of a liquid crystalline (LC) material.
- LC liquid crystalline
- By changing an electric field, the light modulation of the active layer is altered, and characteristics of the light passing through the LC layer are modified.
- the active layer modifies a state of polarization of the passing light.
- the display cell is conventionally sandwiched between two substrates, a front substrate on the viewer side and a rear substrate on the backlight side.
- Optical elements such as polarizers are attached to the outer surfaces of said substrates or axe alternatively provided within the display cell.
- LCDs are generally operable in one or both of two modes, namely a transmissrve mode and a reflective mode.
- the active layer modulates light originating from a backlight system which is usually arranged adjacent to the rear substrate.
- Transmissive LCDs generally have a good contrast ratio, however when used in an outside environment the display becomes practically unreadable.
- the active layer in a reflective LCD modulates ambient light that impinges on the display.
- the reflective LCD relies on a reflector for reflecting the modulated ambient light back towards the viewer.
- ambient light generally passes through the active layer twice.
- the reflector is usually provided in the form of a mirror adjacent or on the rear substrate.
- a reflective LCD is difficult to read if ambient lighting is insufficient. Therefore, mobile devices may incorporate a so-called transflective LCD, which operates in the transmissive and reflective modes at the same time. This has the advantage that the display is usable both under bright and dim ambient light conditions. In the latter case, light from the backlight system is used for viewing the display.
- a common type of transflective LCD incorporates a reflector based on a partial mirror. The partial mirror is arranged for reflecting ambient light while at the same time passing light originating from the backlight system. In designing the partial mirror, generally a trade-off has to be made between sufficient performance of the display in the reflective and transmissive modes.
- a commonly used type of partial mirror is based on a reflective layer provided with apertures for passing light from the backlight system. Because of the relatively small aperture dimensions, the light efficiency of the conventional transflective LCD in the transmissive mode is inherently rather poor. Generally, in order to have sufficient display performance in the transmissrve mode, a backlight with a relatively high emission intensity is required. This is however undesirable in a mobile device because of the inherent high power consumption and shortened lifetime of such a bright backlight.
- a patterned polarizer is arranged between the active layer and the backlight system of the transflective LCD device, said patterned polarizer extending substantially over an area of said apertures in said partial mirror.
- a known LCD has a linearly polarizing foil arranged at the backlight side of the display, which foil is usually provided on the exterior side of the rear substrate.
- the partial mirror Apart from reflecting ambient light in the display cell, the partial mirror also reflects part of the light emitted by the backlight system, so that backlight that does not pass through an aperture is recycled and re-enters into a light guide of the backlight system.
- this recycling is particularly ineffective, due to the fact that light being recycled passes the linear polarizer at the backlight side twice. A relatively large fraction of the recycled light is being absorbed in the polarizer and consequently lost.
- the patterned polarizer of the invention extends substantially over an area of said apertures in said partial mirror, and leaves a reflecting portion of said partial mirror free.
- the patterned polarizer is confined within the aperture area, and the reflective portions of the partial mirror are substantially free of polarizing material.
- the patterned polarizer may be a linear polarizer only, or may also include a quarterwave retarder so as to form a circular polarizer.
- the q ⁇ arterwave retarder may be provided as a foil, or alternatively be provided in patterned form as well. It is also possible that the patterned polarizer is a reflective polarizer, such as a cholesteric linear or circular polarizer. However as they reflect light their use alone can have undesired contrast reduction in the reflective mode.
- Fig. 1 shows a transflective LCD device according to the prior art
- Fig. 2 shows a first embodiment of a transflecti ⁇ ve LCD device according to the invention
- Fig. 3 shows a second embodiment of a transflective LCD device according to the invention
- Fig. 4 shows a fourth embodiment of a transflective LCD device according to the invention
- Fig. 5 shows a fifth embodiment of a transflective LCD device according to the invention.
- like reference numerals represent like elements.
- the Figures display the optical configuration of the device only, additional elements such as color filters, front and rear substrate and pixel electrodes are generally provided in the LCD device, but not shown for clarity reasons.
- the optical configuration of a single picture element 100 of a known transflective LCD is shown in Fig.l.
- the operation of the transflective LCD device is based on light modulation in the active layer 110 including a liquid crystalline material.
- the active layer 110 is arranged between a front stack 130 of optical elements on a viewer side of the LCD, and a rear stack 120 of optical elements on the opposing side of the LCD.
- a backlight system 140 is arranged behind the rear stack 120 for emitting light for operating the device in the transmissive mode.
- the front stack 130 usually includes an absorbing linear polarizer 132 and a retarder 138, arranged on the outside of a front substrate 135.
- the rear stack 120 also includes an absorbing linear polarizer 122 arranged on the outside of rear substrate 125, and thus facing the backlight system 140.
- the rear polarizer 122 has its polarization direction arranged perpendicularly to the polarization direction of the front polarizer 132. Th ⁇ s, the active layer 110 is arranged between crossed linear polarizers.
- the total retardation of the retarder 138 plus the retardation of the liquid crystal material in the active layer 110 is set to be either zero or half lambda ( ⁇ /2).
- the rear stack 120 further includes a partial mirror 124 on the inside of substrate 125, that is the partial mirror 124 faces the active layer 110.
- the partial mirror is also referred to as 'transflector' hereinafter.
- the rear stack 120 further optionally includes the quarter wave retarder layer indicated by 128.
- the partial mirror 124 is a reflective layer on substrate 125, provided with apertures 126 through which light emitted by the backlight system 140 can pass into the active layer 110.
- the backlighting required for LCD operation in the transmissive mode is provided through the apertures 126 in the transflector 124.
- the apertures 126 typically only comprise a.T->out 20 to 30 per cent of the total surface area of the transflector 124, the remainder of the surface area being reflective.
- the transflector 124 reflects the remaining part back towards the backlight system.
- Such light re-enters into the light guide 142 of the backlight system 140, and can exit therefrom again at a different location, thereby contributing to the backlighting of another pixel in the transmissive mode.
- This process is called backlight recycling.
- a so called polarizing reflector is often placed on top of the back light 140.
- backlight recycling in conventional LCDs is not very efficient. The recycled light passes the aborbing polarizer 122 twice, and therefore a substantial portion of recycled light is lost due to absorption.
- FIG. 2 An embodiment of the transflective LCD according to the invention is shown in Fig. 2.
- This transflective LCD has an improved rear stack 220 for more efficient backlight recycling, so that a larger amount of light emitted by the backlight system 240 can be used in transmissive mode operation of the LCD.
- a patterned absorbing linear polarizer 222 is provided substantially only at the location of the apertures 226 in the partial mirror 224. Therefore, essentially only light that passes the apertures 226 is being polarized by the linear polarizer 222.
- the reflective parts of the partial mirror 224 reflect the remaining light back towards the backlight system 240, and since this reflected light no longer has to pass any absorbing optical elements, it is substantially recycled to the backlight system 240 in its entirety. Thus, the amount of recycled light is increased as compared to conventional transflective LCDs.
- the transmissive mode of the LCD can display higher brightness images without the need to increase the power of the backlight system 240, or alternatively the transmissive mode of the LCD can display images at the same brightness level while the power of the backlight system 240 can be reduced.
- a further preferred embodiment of the invention incorporates the rear stack 320 shown in Figure 3.
- This rear stack 320 incorporates a cjuarter wave retarder 328 on the backlight side, which extends substantially only within the apertures 326 in the partial mirror 324.
- This embodiment also has a quarter wave retarder foil 336 in the front stack on the viewer side of the active layer 310, which improves display performance especially for the reflective mode.
- a patterned polarizer on the partial mirror can for example be manufactured from conventional UN polymerizable liquid crystalline materials which can be coated on the partial mirror.
- a patterned layer can be obtained from such a material by using the partial mirror itself as a mask in an UN radiation step. Only UV light passing through the apertures in the partial mirror radiates on the material, and therefore material provided directly inside or over the apertures is cross-linked and polymerized. In a subsequent developing step, remaining liquid material is removed and a patterned layer of polymerized and cross- linked material remains.
- a liquid material including a polymerizable liquid crystalline acrylate and a dichroic dye can be spincoated on one side of the partial mirror. Then, the partial mirror is radiated from the opposite side with UN light.
- a patterned linear polarizer is obtained, which only extends over the apertures of the partial mirror.
- a patterned retarder in particular a patterned retarder, is to be provided as well as shown in Fig. 3, first the patterned polarizer is to be manufacturer, and subsequently an alignement layer needs to be used on top of the patterned polarizer.
- a polymerizable LC acrylate with a thickness matching the desired retardation, thus in this example a thickness of a quarter of the wavelength of visible light, is provided.
- a similar radiation step as for the patterned linear polarizer is subsequently carried out.
- a continuous quarter wave retarder layer is provided on the substrate carrying the partial mirror. The retarder must be provided underneath the partial mirror.
- the patterned polarizer 422 and a quarter wave retarder foil 428 are placed on the outside of substrate 425 instead of on the side facing the active layer.
- the polarizer 422 is patterned in accordance with the apertures 426 in the partial mirror 424, so as to extend at least over an area covered by these apertures 426.
- the patterned polarizer 422 covers a slightly larger area than the apertures.
- the quarter wave foil 428 could alternatively be replaced by a patterned quarter wave retarder inside the apertures 426 of the partial mirror 424.
- the patterned polarizer 522 is formed as a continuous polarizing foil 523 on the outside of the substrate 525, on which a pattern is defined by means of a further partial mirror 527 between the foil and the backlight system. Only light passing the apertures of the further partial mirror 527 is polarized by the polarizing foil 523, the remainder of the light being recycled to the backlight system.
- both a polarizing foil 523 and a quarter wave plate 528 are placed between the two partial mirrors 524 and 527.
- the apertures in the partial mirrors are aligned with respect to each other.
- the apertures could have the same size for both partial mirrors 524 and 527, or alternatively the apertures in the further partial mirror 527 could be slightly larger than the apertures in partial mirror 52 .
- the invention relates to a transflective LCD incorporating a partial mirror as the transflector.
- the transmissive display mode light from a backlight system passes apertures in the transflector.
- recycling of light to the backlight system is improved by substantially only polarizing light that passes an aperture. This is achieved by means of a patterned polarizer extending over the apertures in the partial mirror.
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Polarising Elements (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/599,856 US7965357B2 (en) | 2004-04-15 | 2005-04-08 | Transflective LCD display device comprising a patterned polarizer, display having the same, and method having the same |
JP2007507892A JP4972543B2 (en) | 2004-04-15 | 2005-04-08 | Transflective LCD device |
EP05718665A EP1738218A1 (en) | 2004-04-15 | 2005-04-08 | Transflective lcd display device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04101550.4 | 2004-04-15 | ||
EP04101550 | 2004-04-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005101106A1 true WO2005101106A1 (en) | 2005-10-27 |
Family
ID=34964547
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2005/051154 WO2005101106A1 (en) | 2004-04-15 | 2005-04-08 | Transflective lcd display device |
Country Status (7)
Country | Link |
---|---|
US (1) | US7965357B2 (en) |
EP (1) | EP1738218A1 (en) |
JP (1) | JP4972543B2 (en) |
KR (1) | KR20070004029A (en) |
CN (1) | CN100434995C (en) |
TW (1) | TWI323812B (en) |
WO (1) | WO2005101106A1 (en) |
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US20030210369A1 (en) * | 2002-05-07 | 2003-11-13 | Shin-Tson Wu | Reflective and transflective liquid crystal display using a wire grid polarizer |
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JPH0475025A (en) * | 1990-07-17 | 1992-03-10 | Nec Corp | Lcd panel |
WO1993025992A1 (en) | 1992-06-09 | 1993-12-23 | Eev Limited | Displays |
JP3777971B2 (en) | 1999-12-03 | 2006-05-24 | セイコーエプソン株式会社 | Liquid crystal device and electronic device |
JP3884207B2 (en) | 2000-01-20 | 2007-02-21 | インターナショナル・ビジネス・マシーンズ・コーポレーション | Liquid crystal display |
JP3765284B2 (en) * | 2002-04-09 | 2006-04-12 | セイコーエプソン株式会社 | LIQUID CRYSTAL DISPLAY DEVICE, ITS MANUFACTURING METHOD, AND ELECTRONIC DEVICE |
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2005
- 2005-04-08 CN CNB2005800113206A patent/CN100434995C/en not_active Expired - Fee Related
- 2005-04-08 US US10/599,856 patent/US7965357B2/en active Active
- 2005-04-08 KR KR1020067021099A patent/KR20070004029A/en not_active Application Discontinuation
- 2005-04-08 EP EP05718665A patent/EP1738218A1/en not_active Ceased
- 2005-04-08 JP JP2007507892A patent/JP4972543B2/en active Active
- 2005-04-08 WO PCT/IB2005/051154 patent/WO2005101106A1/en active Application Filing
- 2005-04-12 TW TW094111509A patent/TWI323812B/en not_active IP Right Cessation
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GB2267774A (en) * | 1992-06-09 | 1993-12-15 | Eev Ltd | Display |
US20010017679A1 (en) | 1999-12-06 | 2001-08-30 | Kyoung-Su Ha | Transflective liquid crystal display device |
US20030210369A1 (en) * | 2002-05-07 | 2003-11-13 | Shin-Tson Wu | Reflective and transflective liquid crystal display using a wire grid polarizer |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1826603A1 (en) | 2006-02-22 | 2007-08-29 | Toppoly Optoelectronics Corp. | Back-light "Light-recycling" System for an Area-Division Type Transflective Liquid Crystal Display |
EP2097785A1 (en) * | 2006-12-29 | 2009-09-09 | Jagmohan Bhalla | Lcd with complimentary heterogeneous polarizers for polarization light recycling |
EP2097785A4 (en) * | 2006-12-29 | 2010-07-21 | Jagmohan Bhalla | Lcd with complimentary heterogeneous polarizers for polarization light recycling |
JP2008304673A (en) * | 2007-06-07 | 2008-12-18 | Toppoly Optoelectronics Corp | Liquid crystal display |
Also Published As
Publication number | Publication date |
---|---|
CN1942812A (en) | 2007-04-04 |
TWI323812B (en) | 2010-04-21 |
CN100434995C (en) | 2008-11-19 |
US20080002106A1 (en) | 2008-01-03 |
KR20070004029A (en) | 2007-01-05 |
TW200613845A (en) | 2006-05-01 |
JP4972543B2 (en) | 2012-07-11 |
JP2007532969A (en) | 2007-11-15 |
US7965357B2 (en) | 2011-06-21 |
EP1738218A1 (en) | 2007-01-03 |
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