WO2001096937A1 - Dispositif d'affichage a matrice active, procede de commande associe et element d'affichage - Google Patents
Dispositif d'affichage a matrice active, procede de commande associe et element d'affichage Download PDFInfo
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- WO2001096937A1 WO2001096937A1 PCT/JP2001/004918 JP0104918W WO0196937A1 WO 2001096937 A1 WO2001096937 A1 WO 2001096937A1 JP 0104918 W JP0104918 W JP 0104918W WO 0196937 A1 WO0196937 A1 WO 0196937A1
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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
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136213—Storage capacitors associated with the pixel electrode
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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
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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
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
- G02F1/134336—Matrix
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
- G09G3/3655—Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
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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
- G02F1/133388—Constructional arrangements; Manufacturing methods with constructional differences between the display region and the peripheral region
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- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0219—Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0223—Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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- G—PHYSICS
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3614—Control of polarity reversal in general
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
- G09G3/3659—Control of matrices with row and column drivers using an active matrix the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes
Definitions
- the present invention relates to an active matrix display device, a driving method thereof, and a display element.
- the present invention relates to an active matrix type display device using a switching element such as a thin film transistor, a driving method thereof, and a display element.
- a liquid crystal display device As a display device, for example, a liquid crystal display device is widely used as a thin and lightweight flat display for display devices of various electronic devices. Above all, active matrix type liquid crystal display devices using switching elements such as thin film transistors (TFTs) are being widely applied to monitors and displays for personal computers and liquid crystal televisions due to their excellent image characteristics. It is.
- TFTs thin film transistors
- the display device is roughly divided into a scanning signal driving circuit 21, a video signal driving circuit 22, and a display element 23.
- the display element includes a plurality of pixel electrodes 5 arranged in a matrix, a plurality of switching elements 3 (generally, a thin film transistor (TFT) or the like is used) arranged corresponding thereto, and a matrix of pixel electrodes.
- the main constituent elements are a plurality of scanning electrodes 1 arranged in the row direction (horizontal direction) and a plurality of video signal electrodes 2 arranged in the column direction (vertical direction) corresponding to the pattern arrangement. Note that the video signal electrode 2 is electrically connected to the pixel electrode 5 via the switching element 3.
- a counter electrode 20 is provided to face the pixel electrode 5, and a display medium such as a liquid crystal is inserted between the pixel electrode 5 and the counter electrode 4. ing. Further, an electrode called a common electrode 4 is provided in parallel with the scanning electrode 1, and a storage capacitor 7 is provided between the common electrode 4 and the pixel electrode 5.
- the video signal drive circuit 22 is a drive circuit that applies a video signal to the plurality of video signal electrodes 2 of the display element 23.
- the scanning signal driving circuit 21 is a driving circuit that applies a scanning signal for controlling conduction of the switching element 3 to the plurality of scanning electrodes 1 of the display element 23.
- this active matrix type liquid crystal display device there is a driving method disclosed in Japanese Patent Application Laid-Open No. 5-143201. This is done by providing a wiring called a common electrode in parallel with the scanning electrode (also called the gate electrode or gate line), forming a storage capacitor between this common electrode and the pixel electrode, and setting the potential of the common electrode to the scanning electrode. It fluctuates in synchronization with the potential and applies a superimposed voltage to the pixel electrode potential by capacitive coupling through the storage capacitor. The effect of this voltage superposition has the effects of lowering the video signal voltage (source voltage), reducing drive power, improving response speed, and improving drive reliability.
- source voltage source voltage
- FIG. 14 shows a liquid crystal display device in which a storage capacitor C st (C st is more generally a capacitance between a common electrode and a pixel electrode) is formed between a common electrode and a pixel electrode.
- FIG. 1 ′ 5 is an equivalent circuit diagram of a pixel, and FIG. 1 ′ 5 is a diagram for explaining the potential of each unit when the liquid crystal display device 1 is driven.
- TFT is a thin film transistor
- 8 (1 is the capacitance between the gate and the drain (capacity between the scanning electrode and the pixel electrode)
- C 1 c is the capacitance between the pixel electrode and the opposing electrode that faces the liquid crystal.
- V g (n) is the scanning electrode potential
- V s is the video signal potential
- V d is the pixel electrode potential
- V d is the opposing potential.
- the potential of the electrode, V c (n) indicates the potential of the common electrode.
- the elementary arrays are arranged in a matrix, and Vg and Vc have a special suffix n in the sense that they focus on the nth row.
- a pixel whose ONZOF F (of TFT) is controlled by a scanning electrode with respect to a certain scanning electrode generally, Are sometimes referred to as “pixels belonging to the scanning electrode”.
- the scanning electrode that controls the ONZOFF of the TFT of this pixel with reference to a certain pixel (or pixel electrode) is sometimes called “the current scanning electrode”.
- the pixel electrode (Vd) in Fig. 14 is the "pixel electrode belonging to the scanning electrode (Vg (n))", and the scanning electrode (Vg (n)) is " Scan electrode ”.
- the common electrode is referred to as “the other common electrode of the storage capacitor connected to the pixel electrode”.
- the common electrode (Vc (n)) in Fig. 14 is the "common electrode of the other connection destination of the storage capacitor connected to the pixel electrode (Vd)". I do.
- the video signal voltage takes a negative value with respect to Vd and is V sig (—).
- Vg (n) becomes the ON level (the first potential level of the scan electrode) Vgon
- the TFT becomes conductive ( ⁇ ⁇ N state), and the pixel potential Vd is charged to V sig (one).
- the potential of the common electrode has a value of Vc (—) (second potential level of the common electrode).
- Vc (—) second potential level of the common electrode.
- the TFT is turned off (OFF state) by setting Vg (n) to an off level (second potential level of the scanning electrode) Vg 0 ff.
- the video signal voltage takes a positive value based on Vd and is Vsig (+).
- Vsig (+) the potential of the common electrode is set to Vc (+) (the first potential level of the common electrode).
- Vc (+) the first potential level of the common electrode.
- the potential of the common electrode is changed upward from Vc (+) to Vcoff.
- a coupling voltage proportional to this voltage difference is superimposed upward.
- V sig (+) and V sig (-) are applied to the video signal electrode
- Vd o (+) and Vd o (—) are applied to the pixel electrode.
- the period during which the common electrode potential is V c (+) or V c (—) is called the common electrode compensation period, and the voltage V c (sat) at this time is called the common electrode compensation voltage (compensation potential).
- Vc (+) and Vc (—) have different values, but Vcofff may be the same voltage as either Vc (+) or Vc ( ⁇ ).
- the common electrode potential does not necessarily have to be at one of Vc (sat), and at least the instant when the scan electrode falls from Vgon to Vgoff ( In other words, it is sufficient that this value is obtained at the moment when the TFT changes from ⁇ N to OFF).
- the scanning signal drive circuit has two output levels, and the common electrode potential control circuit has three output levels. That is, the scanning signal drive circuit includes the first potential level Vg0n and the second potential level Vgoff And the common electrode potential control circuit has a first potential level V c (ten), a second potential level V c (one), and a third potential level V coff.
- the common electrode potential control circuit has a first potential level V c (ten), a second potential level V c (one), and a third potential level V coff.
- three power supplies are required for the common electrode potential drive circuit corresponding to the above three potential levels. However, if one of the first potential level V c (+) and the second potential level V c (—) is made equal to the third potential level V coff, only two power supplies are required. Even when one of the compensation potentials is equal to V coff, it is regarded as another potential level, and there are three potential levels.
- V c o f f + C 1 c (Vd o (—) one Vd)
- Vd o (one) V s i g (-)-a s t ⁇ V c (--a g d ⁇ V g o n
- Vd o (+) V sig (+)-st ⁇ V c (+)-agd ⁇ V g on
- V c (+) V c (+)-V c o f f
- V c (—) V c (one)-V c o f f
- the second term on the right-hand side corresponds to the superposition due to the (capacitance) coupling voltage from the common electrode, and is determined by AVc (+) or AVc (—).
- AV c (+) or AV c (—) is the potential of the common electrode to which the storage capacitor is connected at the moment when the pixel is charged (in this case, V c (+) or V c (-) ) Is based on the potential in the holding state (Vc off in this case).
- the third term on the right-hand side of (Equation 12) is the (capacitive) coupling voltage from the scanning electrode, and is called “feedthrough”. Note that C tot in (Equation 14) can be regarded as the sum of the total capacitance electrically connected to the pixel electrode.
- the pixel electrode is charged with a signal voltage whose polarity is inverted every frame.
- the whole screen may be inverted with the same polarity every frame (field inversion method), but other methods such as inverting each row with the opposite polarity (line inversion method), Inversion method with reversed polarity (column inversion method) and line inversion
- line inversion method Inversion method with reversed polarity
- line inversion method There is a method (dot reversal method) in which the reversal and column reversal are combined and reversed in a checkered pattern.
- the charge patterns of the pixels in each of these methods are as shown in Figure 16A, Figure 16B, Figure 16C, and Figure 16D, respectively.
- the voltage waveform applied to the adjacent video signal electrodes VSP and VSQ for each of them is as shown on the right side of each figure.
- the polarity of the video signal applied to the video signal electrode within one frame is constant, but in the case of line inversion and dot inversion, the polarity of the video signal is selected each time the scanning electrode is selected. Is inverted.
- the polarity between adjacent video signal electrodes is the same, but in the case of column inversion and dot inversion, the polarity is opposite.
- the video signal drive circuit has the function of simultaneously applying two types of video signals with different polarities (ie, positive and negative polarities) to multiple video signal electrodes.
- the present invention has been made in view of the above-described problems, and its object is to firstly reduce the flit force and the luminance gradient, and secondly, to reduce the voltage of the video signal drive circuit IC. It is an object of the present invention to provide a display device, a driving method thereof, and a display element capable of reducing horizontal crosstalk.
- a first display device includes a plurality of pixel electrodes arranged in a matrix, a switching element connected thereto, a scanning electrode, a video signal electrode,
- a display device comprising: a common electrode; a counter electrode; a display medium inserted between the pixel electrode and the counter electrode; and a storage capacitor formed between the pixel electrode and the common electrode.
- the capacitance between the scan electrode and the pixel electrode between the pixel electrode and the scan electrode is represented by C gd
- the capacitance between the common electrode and the common electrode between the pixel electrode and the common electrode is represented by C st
- C tot When the sum of the total capacitance electrically connected to the electrodes is represented by C tot,
- the first display device in accordance with the display cycle and are preferably c comprises a video signal driving circuit for applying a two video signals of different polarities to the video signal electrodes, the first display device, a plurality of common A common electrode potential control circuit for applying voltage signals to the electrodes; and a scanning signal driving circuit for applying voltage signals to the plurality of scanning electrodes, wherein the common electrode potential control circuit has at least a binary output potential level.
- the scanning signal driving circuit has at least a binary output potential level. It is preferred to have a bell.
- the potential of the scan electrode becomes the first potential level Vgon, and during a holding period in which the scan electrode is not selected, the potential of the scan electrode is approximately The second potential level Vg off,
- the potential of the other common electrode of the storage capacitor connected to the pixel electrodes of the plurality of pixels belonging to the scan electrode is the first potential when the polarity of the video signal is positive.
- Potential level Vc (+) and when the polarity of the video signal is negative, the potential level becomes the second potential level Vc ( ⁇ ), and the subsequent potential level of the first potential level Vc (+) of the common electrode.
- AVc (+) the difference with respect to the potential during the holding period
- AVc (1) the difference between the second potential level Vc (—) of the common electrode and the potential during the subsequent holding period
- the key represented by is smaller in a portion far from the power supply end than in a portion close to the power supply end in the screen.
- the value of the key at a portion of the screen near the power supply end is r ( ⁇ )
- the value of the portion of the screen at a distance from the power supply end in the screen is ⁇ (E)
- the distance is between them.
- the ⁇ (M) is preferably smaller than [ ⁇ ⁇ ( ⁇ ) + ⁇ (E)] / 2.
- Vcp take a negative value.
- the potential of the scan electrode becomes the first potential level Vgon, and during a holding period in which the scan electrode is not selected, the potential of the scan electrode is approximately It becomes the second potential level V goff
- the potential of the other common electrode of the storage capacitor connected to the pixel electrodes of the plurality of pixels belonging to the scan electrode is the first potential when the polarity of the video signal is positive.
- the potential level of the common electrode is Vc (+), and when the polarity of the video signal is negative, the potential level is the second potential level Vc ( ⁇ ).
- the difference with respect to the potential in the subsequent holding period is represented by AVc (+), and the difference of the second potential level Vc (—) of the common electrode from the potential in the subsequent holding period is represented by AVc (1).
- j8 represented by is larger in a portion far from the power supply end than in a portion near the power supply end in the screen.
- j3 ( ⁇ ) is the value of (3) above at the part near the power supply end in the screen, and the value at the part far from the power supply end in the screen is] 3 (E).
- ⁇ ( ⁇ ) is preferably larger than [j3 ( ⁇ ) + ⁇ ( ⁇ )] ⁇ 2.
- the AV cc is negative.
- the potential of the scan electrode becomes the first potential level Vgon, and during a holding period in which the scan electrode is not selected, the potential of the scan electrode is set. Is approximately the second potential level V go ⁇ ⁇ ,
- the potential of the other common electrode of the storage capacitor connected to the pixel electrodes of the plurality of pixels belonging to the scan electrode is the first potential when the polarity of the video signal is positive.
- Potential level V c (+) and when the polarity of the video signal is negative, the potential level becomes the second potential level V c (—).
- the difference between the first potential level V c (+) of the common electrode and the potential during the subsequent holding period is represented by ⁇ c (+), and the difference of the second potential level V c (—) of the common electrode is ,
- AV c (1) When the difference with respect to the potential during the subsequent holding period is represented by AV c (1),
- a second display device includes a plurality of pixel electrodes arranged in a matrix, a switching element connected thereto, a scan electrode, a video signal electrode, A common electrode, a counter electrode, a display medium inserted between the pixel electrode and the counter electrode, and a storage capacitor formed between the pixel electrode and any of the common electrodes.
- the display device includes a plurality of the common electrodes that are connected to the pixel electrodes of a plurality of pixels belonging to one scan electrode and are connected to the other end of the storage capacitor.
- the capacitance between the scanning electrode and the pixel electrode is represented by C gd
- the capacitance between the common electrode and the pixel electrode between the pixel electrode and the common electrode is represented by C st
- the total capacitance electrically connected to the pixel electrode is represented by C st.
- the second display device simultaneously applies two types of video signals having different polarities to a plurality of video signal electrodes, and, when viewing each of the video signal electrodes, displays two types of video signals having different polarities in accordance with a display cycle. It is preferable to include a video signal driving circuit for applying a video signal.
- the second display device includes, of a plurality of pixels belonging to one scan electrode, the other of the storage capacitors connected to the pixel electrodes of the pixels belonging to the video signal electrode for applying the video signal of the first polarity.
- the first common electrode of the connection destination is different from the first common electrode, and the storage connected to the pixel electrode of the pixel belonging to the video signal electrode that applies the video signal of a second polarity. It is preferable to include the second common electrode of the other connection destination of the capacity.
- the second display device includes a common electrode potential control circuit for applying a voltage signal to a plurality of common electrodes, and a scan signal driving circuit for applying a voltage signal to a plurality of scan electrodes.
- the circuit has at least two output potential levels
- the scanning signal drive circuit has at least two output potential levels.
- the potential of the scan electrode becomes the first potential level Vgon, and during a holding period in which the scan electrode is not selected, the potential of the scan electrode becomes Approximately the second potential level V goff is obtained,
- the potential of the first common electrode is the first potential when the polarity of the video signal applied to the video signal electrode corresponding to the first common electrode is positive.
- Level Vc (+) and when the polarity of the video signal is negative, the second potential level Vc (—),
- the potential of the second common electrode is the first potential when the polarity of the video signal applied to the video signal electrode corresponding to the second common electrode is positive.
- the potential level becomes Vc (+), and when the polarity of the video signal is negative, the potential level becomes the second potential level Vc ( ⁇ ), and the subsequent holding period of the first potential level Vc (+) of the common electrode
- AVc (+) represents the difference with respect to the potential at the time
- ⁇ c ( ⁇ ) represents the difference of the second potential level Vc ( ⁇ ) of the common electrode with respect to the potential during the subsequent holding period.
- the key represented by is smaller in a portion far from the power supply end than in a portion close to the power supply end in the screen.
- Vcp is negative.
- the potential of the scan electrode becomes the first potential level Vgon, and during a holding period in which the scan electrode is not selected, the potential of the scan electrode becomes Approximately the second potential level V g 0 f ⁇
- the potential of the first common electrode is the first potential when the polarity of the video signal applied to the video signal electrode corresponding to the first common electrode is positive.
- Level Vc (+) When the polarity is negative, the potential becomes the second potential level V c (—),
- the potential of the second common electrode is the first potential when the polarity of the video signal applied to the video signal electrode corresponding to the second common electrode is positive.
- Potential level Vc (+) If the polarity of the video signal is negative, the potential level becomes the second potential level Vc ( ⁇ ), and the subsequent potential level of the first potential level Vc (+) of the common electrode.
- the difference with respect to the potential during the holding period is represented by ⁇ c (+), and the difference between the second potential level V c (—) of the common electrode and the potential during the subsequent holding period is represented by ⁇ c (1).
- j3 represented by is larger in a portion far from the power supply end than in a portion near the power supply end in the screen.
- jS (0) is the value of the above) 3 at the part near the power supply end in the screen
- j3 (E) is the value of the part at the part distant from the power supply end in the screen, and is the distance between them.
- ⁇ ( ⁇ ) is preferably larger than [jS (O) + ⁇ ( ⁇ )]] 2.
- ⁇ c c is preferably negative.
- the potential of the scan electrode becomes the first potential level Vg ⁇ , and during a holding period in which the scan electrode is not selected, the potential of the scan electrode is set. Becomes approximately the second potential level V g 0 ff,
- the potential of the first common electrode when the scanning electrode is selected, When the polarity of the video signal applied to the video signal electrode corresponding to the first common electrode is positive, it becomes the first potential level Vc (+), and when the polarity of the video signal is negative, The second potential level V c (—),
- the potential of the second common electrode is the first potential when the polarity of the video signal applied to the video signal electrode corresponding to the second common electrode is positive.
- Potential level Vc (+) and when the polarity of the video signal is negative, the potential level becomes the second potential level Vc ( ⁇ ), and the subsequent holding period of the first potential level Vc (+) of the common electrode
- AVc (+) represents the difference with respect to the potential at the time
- ⁇ vc (-1) represents the difference of the second potential level Vc (—) of the common electrode with respect to the potential during the subsequent holding period.
- i8 represented by is larger in a portion far from the power supply end than in a portion near the power supply end in the screen.
- a third display device includes a plurality of pixel electrodes arranged in a matrix, a switching element connected thereto, a scanning electrode, a scanning electrode, and a video signal electrode.
- Third display device comprises a video signal driving circuit for applying a two video signals of different polarities to the video signal electrode, the third display device, a plurality of common A common electrode potential control circuit for applying voltage signals to the electrodes; and a scanning signal driving circuit for applying voltage signals to the plurality of scanning electrodes, wherein the common electrode potential control circuit has at least a binary output potential level.
- the scanning signal drive circuit has at least a binary output potential level.
- the potential of the scan electrode becomes a first potential level Vgon, and during a holding period in which the scan electrode is not selected, the potential of the scan electrode is approximately The second potential level Vg oif,
- the potential of the common electrode facing the pixel electrodes of the plurality of pixels belonging to the scan electrode via the display medium is set to the first potential level when the polarity of the video signal is positive.
- V c (+) the second potential level
- V c (—) when the polarity of the video signal is negative
- the difference between the first potential level Vc (+) of the common electrode and the potential during the subsequent holding period is represented by AVc (+), and the difference between the second potential level Vc (—) of the common electrode and The difference with respect to the potential during the subsequent holding period is c (I)
- Vc p AVc (+)- ⁇ Vc (1)... (Equation 8)) is defined as r for the portion farther from the power supply end compared to the portion closer to the power supply end in the screen. It is preferable to make it smaller.
- r (o) is the value at the portion of the screen closer to the power supply end in the screen
- ⁇ (E) is the value of the portion of the screen far from the power supply end in the screen.
- ⁇ (M) is preferably smaller than [ ⁇ (O) +7 (E)] / 2.
- Vcp is negative.
- the potential of the scan electrode becomes the first potential level Vgon, and during a holding period in which the scan electrode is not selected, the potential of the scan electrode is approximately It becomes the second potential level V g 0 ff,
- the potential of the common electrode facing the pixel electrodes of the plurality of pixels belonging to the scan electrode via the display medium is set to the first potential level V when the polarity of the video signal is positive. c (+), and when the polarity of the video signal is negative, it becomes the second potential level V c (—),
- the value of the iS at a portion close to the power supply end in the screen is ( ⁇ ), and the value at a portion of the screen far from the power supply end in the screen is / 3 (E), which is a distance between them.
- ⁇ ( ⁇ ) is preferably larger than [3 ( ⁇ ) + ⁇ ( ⁇ )] ⁇ 2.
- the AV cc is negative.
- the potential of the scan electrode becomes the first potential level Vgon, and during a holding period in which the scan electrode is not selected, the potential of the scan electrode is approximately The second potential level Vg off,
- the potential of the common electrode facing the pixel electrodes of the plurality of pixels belonging to the scan electrode via the display medium is set to the first potential level V when the polarity of the video signal is positive. c (+), and when the polarity of the video signal is negative, it becomes the second potential level V c (—),
- V cp AV c (+)- ⁇ V c (-)... (Equation 8)) is compared with the portion farther from the power supply end in the screen than the portion closer to the power supply end. Is smaller, and
- I3 which is represented by, is farther from the It is preferable to increase the size at the portion where the noise does not occur.
- a fourth display device includes a plurality of pixel electrodes arranged in a matrix, switching elements connected thereto, a scanning electrode, a scanning electrode, and a video signal electrode.
- the capacitance between the scan electrode and the pixel electrode between the pixel electrode and the scan electrode is represented by cgd; the capacitance between the common electrode and the common electrode between the pixel electrode and the common electrode is represented by C 1 c;
- C tot When the sum of the total capacitance electrically connected to the electrodes is represented by C tot,
- the fourth display device simultaneously applies two types of video signals having different polarities to a plurality of video signal electrodes, and, when viewing each of the video signal electrodes, displays two types of video signals having different polarities in accordance with a display cycle. It is preferable to include a video signal driving circuit for applying a video signal.
- the fourth display device opposes, via a display medium, a pixel electrode of a pixel belonging to a video signal electrode to which a video signal of the first polarity is applied, among a plurality of pixels belonging to one scan electrode.
- the first common electrode faces the pixel electrode of the pixel belonging to the video signal electrode to which the video signal of the second polarity is applied, via the display medium.
- the fourth display device further includes a common electrode potential control circuit for applying a voltage signal to the plurality of common electrodes, and a scan signal driving circuit for applying a voltage signal to the plurality of scan electrodes.
- the circuit has at least two output potential levels
- the scanning signal drive circuit has at least two output potential levels.
- the potential of the scan electrode becomes the first potential level Vgon, and during a holding period in which the scan electrode is not selected, the potential of the scan electrode is approximately It becomes the second potential level V goff,
- the potential of the first common electrode is the first potential when the polarity of the video signal applied to the video signal electrode corresponding to the first common electrode is positive.
- Level Vc (+) and when the polarity of the video signal is negative, the second potential level Vc (-)
- the potential of the second common electrode is the first potential when the polarity of the video signal applied to the video signal electrode corresponding to the second common electrode is positive.
- Potential level Vc (+) If the polarity of the video signal is negative, the potential level becomes the second potential level Vc ( ⁇ ), and the subsequent potential level of the first potential level Vc (+) of the common electrode.
- AVc (+) A case where the difference with respect to the potential during the holding period is represented by AVc (+), and the difference between the second potential level Vc (—) of the common electrode and the potential during the subsequent holding period is represented by AVc (1).
- Vc p AVc (+)- ⁇ Vc (1)... (Equation 8)) is farther from the power supply end than the portion near the power supply end in the screen. It is preferable to reduce the size at the portion where the noise does not occur.
- the value at a portion of the screen closer to the power supply end in the screen is ⁇ ( ⁇ )
- the value at a portion of the screen far from the power supply end in the screen is ⁇ (E).
- ⁇ (M) it is preferable that ⁇ (M) is smaller than [ ⁇ ( ⁇ ) + r (E)] / 2. .
- Vcp is negative.
- the potential of the scan electrode becomes the first potential level Vgon, and during the holding period in which the scan electrode is not selected, the potential of the scan electrode is approximately The second potential level becomes' Vg off,
- the potential of the first common electrode is the first potential when the polarity of the video signal applied to the video signal electrode corresponding to the first common electrode is positive.
- Level V c (+) and when the polarity of the video signal is negative, the potential becomes the second potential level V c (—),
- the potential of the second common electrode is the first potential when the polarity of the video signal applied to the video signal electrode corresponding to the second common electrode is positive.
- Potential level Vc (+) and when the polarity of the video signal is negative, the potential level becomes the second potential level Vc (—), and after the first potential level Vc (+) of the common electrode,
- AVc (+) The difference with respect to the potential during the holding period
- AVc (-1) the difference between the second potential level Vc (—) of the common electrode and the potential during the subsequent holding period.
- the value of the above / 3 at the portion close to the power supply end in the screen is ( ⁇ )
- the value at the portion of the screen far from the power supply end is jS (E)
- the distance is between them.
- ⁇ ( ⁇ ⁇ ⁇ ⁇ ) is preferably larger than [iS ( ⁇ ) + ⁇ ( ⁇ )] ⁇ 2.
- the AV cc is negative.
- the potential of the scanning electrode becomes the first potential level Vgon, and during a holding period in which the scanning electrode is not selected, the potential of the scanning electrode becomes Approximately the second potential level V goff is obtained,
- the potential of the first common electrode is the first potential when the polarity of the video signal applied to the video signal electrode corresponding to the first common electrode is positive.
- Level Vc (+) and when the polarity of the video signal is negative, the second potential level Vc (—),
- the potential of the second common electrode is the first potential when the polarity of the video signal applied to the video signal electrode corresponding to the second common electrode is positive.
- V cp AV c (+)- ⁇ V c (1)... (Equation 8)) is defined as the part farther from the power supply end compared to the part closer to the power supply end in the screen. Is smaller, and
- the display medium is a liquid crystal.
- the pixel electrode and the counter electrode have a structure in which a parallel plate capacitor is formed with a liquid crystal layer interposed therebetween.
- the display medium is a liquid crystal.
- the common electrode is formed on the same substrate as the pixel electrode, and the liquid crystal is operated by an electric field parallel to the substrate.
- at least one of the capacitors constituting the C tot includes a capacitor formed by sandwiching an insulating layer between two conductive layers or semiconductor layers;
- a first driving method for a display device is a method for driving a first or second display device, After a potential is written to the pixel electrode via the switching element, a voltage via the Cst, which has a different value in a portion near and far from the power supply end in the screen, is superimposed. It is characterized by
- the polarity of the video signal is applied to the other common electrode of the storage capacitor connected to the pixel electrodes of the plurality of pixels belonging to the scan electrode.
- the first potential level Vc (+) when a certain scan electrode is selected, the polarity of the video signal is applied to the other common electrode of the storage capacitor connected to the pixel electrodes of the plurality of pixels belonging to the scan electrode.
- the first potential level Vc (+) when the polarity of the video signal is negative, it is preferable to apply the second potential level Vc ( ⁇ ).
- a second driving method of a display device is a method of driving a third or fourth display device
- a voltage which is a voltage via the C 1 c and which has a different value in a portion near and far from a power supply end in a screen. It is characterized by superimposition.
- the second driving method when a certain scanning electrode is selected, when a polarity of a video signal is positive to a common electrode facing a pixel electrode of a plurality of pixels belonging to the scanning electrode via a display medium, Preferably applies a first potential level Vc (+), and applies a second potential level Vc (-) when the polarity of the video signal is negative.
- a fifth display device controls a voltage applied to a display medium by a potential of a pixel electrode, and applies both positive and negative voltages to the display medium.
- a display device for performing display wherein a capacitive coupling voltage is superimposed on an electrode other than the pixel electrode on the pixel electrode, and a positive voltage and a negative voltage are applied to the display medium. With this, the distribution of the capacitive coupling voltage in the display area is different. And features.
- the electrodes other than the pixel electrodes are common electrodes.
- a sixth display device includes a plurality of pixel electrodes arranged in a matrix, a switching element connected thereto, a scanning electrode, a video signal electrode, A display device comprising: a common electrode; a counter electrode; a display medium inserted between the pixel electrode and the counter electrode; and a storage capacitor formed between the pixel electrode and the common electrode.
- a seventh display device includes a plurality of pixel electrodes arranged in a matrix, a switching element connected thereto, a scanning electrode, a video signal electrode, A common electrode, a display medium inserted between the pixel electrode and the common electrode, an electrode other than the common electrode facing the pixel electrode via the display medium, and an electrode other than the scanning electrode at the current stage, and What is claimed is: 1. A display device having a storage capacitor formed between a pixel electrode and a pixel electrode, wherein the capacitive coupling voltage from the scan electrode and the capacitive coupling voltage from the common electrode are distributed in a screen to cause flicker. And the luminance gradient is corrected at the same time.
- an eighth display device includes a plurality of pixel electrodes arranged in a matrix, switching elements connected thereto, a scanning electrode, a scanning electrode, and a video signal electrode.
- a display device having a common electrode, a counter electrode, a display medium inserted between the pixel electrode and the counter electrode, and a storage capacitor formed between the pixel electrode and any of the common electrodes
- the storage capacitor connected to the pixel electrode of a plurality of pixels belonging to one scan electrode has a plurality of the common electrodes at the other connection destination.
- a ninth display device includes a plurality of pixel electrodes arranged in a matrix, a switching element connected thereto, a scanning electrode, a video signal electrode, A display device having a common electrode and a display medium inserted between the pixel electrode and the common electrode, wherein the pixel electrode and the display medium of a plurality of pixels belonging to one scan electrode are included. There is a plurality of the common electrodes opposed to each other through the intermediary.
- a first display element according to the present invention includes a plurality of pixel electrodes arranged in a matrix, a switching element connected thereto, a scanning electrode, a scanning electrode, and a video signal electrode.
- a display element having a common electrode, a counter electrode, a display medium inserted between the pixel electrode and the counter electrode, and a storage capacitor formed between the pixel electrode and the common electrode.
- the capacitance between the scan electrode and the pixel electrode between the pixel electrode and the scan electrode is represented by C gd
- the capacitance between the common electrode and the common electrode between the pixel electrode and the common electrode is represented by C st
- C tot When the sum of the total capacitance electrically connected to the electrodes is represented by C tot,
- a second display element includes a plurality of pixel electrodes arranged in a matrix, a switching element connected thereto, a scanning electrode, a scanning electrode, and a video signal electrode.
- the common electrode at the other connection destination of the storage capacitor connected to the pixel electrode of a plurality of pixels belonging to one of the scan electrodes is a plurality of display elements, and scans between the pixel electrode and the scan electrode.
- the capacitance between the electrode and the pixel electrode is represented by C gd
- the capacitance between the common electrode and the common electrode between the pixel electrode and the common electrode is represented by C st
- the total capacitance electrically connected to the pixel electrode ⁇ When the sum is represented by C tot,
- a third display element includes a plurality of pixel electrodes arranged in a matrix, a switching element connected thereto, a scanning electrode, and a video signal electrode.
- a fourth display element includes a plurality of pixel electrodes arranged in a matrix, a switching element connected thereto, a scan electrode, a scan electrode, and a video signal electrode.
- the common electrode facing the electrode via the display medium is a plurality of display elements
- the capacitance between the scan electrode and the pixel electrode between the pixel electrode and the scan electrode is represented by C gd
- the capacitance between the common electrode and the common electrode between the pixel electrode and the common electrode is represented by C 1c
- C tot When the sum of all capacitances electrically connected to the pixel electrode is represented by C tot,
- a tenth display device includes a plurality of pixel electrodes arranged in a matrix, a switching element connected thereto, a scanning electrode, and a video signal electrode.
- the scanning electrode is supplied with power from only one side of a display region, and the common electrode is a display device in which the potential is fixed at least on the side opposite to the side where the scanning electrode is supplied with power in the display region,
- the capacitance between the scan electrode and the pixel electrode between the pixel electrode and the scan electrode is represented by C gd
- the capacitance between the common electrode and the common electrode between the pixel electrode and the common electrode is represented by C st
- C tot When the sum of the total capacitance electrically connected to the electrodes is represented by C tot,
- a first display device includes a plurality of pixel electrodes arranged in a matrix, a switching element connected thereto, a scanning electrode, and a video signal electrode.
- the capacitance between the scan electrode and the pixel electrode between the pixel electrode and the scan electrode is represented by C gd
- the capacitance between the common electrode and the common electrode between the pixel electrode and the common electrode is represented by C 1c
- C tot When the sum of all capacitances electrically connected to the pixel electrode is represented by C tot,
- gd (F) is the value of the portion of the gd represented by in the display region that is farthest from the power supply end of the scan electrode, where gd (F) is the value of gd that is farthest from the power supply end of the scan electrode in the display region. Between the closest parts, there is a position where the value of 3 ⁇ 4 01 is larger than ⁇ 01 (F).
- a common period is used in a holding period after the pixel electrode is charged with a positive video signal and a holding period after the pixel electrode is charged with a negative video signal.
- the electrode potentials are different.
- the scanning signal drive circuit simultaneously writes data in a plurality of rows.
- the display medium is a ⁇ CB mode liquid crystal.
- both the scanning signal drive circuit and the common electrode potential control circuit are formed on the same substrate as the switching element.
- the display medium comprises a medium for controlling an optical state by a current and an auxiliary switching element.
- the medium whose optical state is controlled by a current is an organic electroluminescence medium.
- a frit force or a luminance gradient can be significantly reduced.
- FIG. 1 is a plan view showing a pixel layout of the display device according to the first embodiment of the present invention.
- FIG. 2 is a sectional view taken along line AA ′ of FIG.
- FIG. 3 is a circuit configuration diagram of the display device according to the first embodiment of the present invention.
- FIG. 4 is a plan view showing a pixel layout of a display device according to the second embodiment of the present invention.
- FIG. 5 is a circuit configuration diagram of a display device according to the second embodiment of the present invention.
- FIG. 6A is a waveform diagram of an odd-numbered frame for describing a driving method by dot inversion driving of the display device according to the second embodiment of the present invention.
- FIG. 6B is a waveform diagram of an even-numbered frame for describing a driving method by dot inversion driving of the display device according to the second embodiment of the present invention.
- FIG. 7A is a waveform diagram of an odd-numbered frame for describing a driving method by column inversion driving of the display device according to the second embodiment of the present invention.
- FIG. 7B is a waveform diagram of an even-numbered frame for describing a driving method by column inversion driving of the display device according to the second embodiment of the present invention.
- FIG. 8 is a circuit diagram for one pixel of a display device according to the fourth embodiment of the present invention.
- FIG. 9 is a plan view showing a pixel layout of a display device according to the fourth embodiment of the present invention.
- FIG. 10 is a sectional view taken along a line ⁇ _ ⁇ ′ in FIG.
- FIG. 11 is a circuit configuration diagram of a display device according to the fourth embodiment of the present invention.
- FIG. 12 is a plan view showing a pixel layout of a display device according to the fifth embodiment of the present invention.
- FIG. 13 is a circuit configuration diagram of a display device according to the fifth embodiment of the present invention.
- FIG. 14 is a circuit diagram of one pixel of the display device according to the related art and the first embodiment of the present invention.
- FIG. 15 is a waveform chart for explaining a conventional method of driving the display device according to the first embodiment of the present invention.
- FIG. 16D is a diagram showing a polarity pattern of pixels and a scan signal waveform in the field inversion method.
- Fig. 16B shows the pixel polarity pattern and scanning signal in the line inversion method. It is a figure showing a waveform.
- FIG. 16C is a diagram showing a pixel polarity pattern and a scanning signal waveform in the column inversion method.
- FIG. 16D is a diagram showing a polarity pattern of a pixel and a scanning signal waveform in the dot inversion method.
- FIG. 17 is a waveform diagram for explaining that the recharge voltage is different between a portion near and far from the power supply end.
- FIG. 18 is a diagram for explaining the magnitude relationship between the recharge voltages.
- FIG. 19A is a diagram showing an example of how to give a distribution in the screen of FIG.
- FIG. 19B is a diagram showing an example of how to give the distribution in the screen of 3).
- FIG. 19C is a diagram showing an example of how to give the distribution of ⁇ in the screen.
- FIG. 19D is a diagram showing an example of how to give the distribution in the screen of 3).
- FIG. 2OA is a diagram showing an example of how to give the distribution of the key on the screen.
- FIG. 20B is a diagram showing an example of how to give a distribution within the end screen.
- FIG. 20C is a diagram showing an example of how to give the distribution of the key on the screen.
- FIG. 20D is a diagram showing an example of how to provide a distribution of keys in a screen.
- FIG. 21 is a model circuit diagram for considering the optimal distribution of) 3 and ⁇ .
- FIG. 22 is a structural unit circuit diagram of the model circuit of FIG.
- FIG. 23 is a diagram showing a time change of a voltage at each node in the model circuit of FIG. 21.
- FIG. 24 is a diagram showing the distribution of the recharge voltage in the screen derived from the model calculation.
- FIG. 25A is a diagram showing another example of how to give the distribution of ⁇ in the screen.
- FIG. 25D is a diagram showing another example of how to give the distribution in the screen of 3).
- Figure 26 ⁇ shows an example of the power supply method for the scanning electrode and the common electrode and the relationship between the recharging voltage.
- FIG. 26B is a diagram showing an example of a power supply method for the scan electrode and the common electrode and a relationship between the recharge voltage.
- FIG. 26C is a diagram illustrating an example of a power supply method of the scan electrode and the common electrode and a relationship between the recharge voltage.
- FIG. 26D is a diagram showing an example of a power supply method of the scan electrode and the common electrode and a relationship between the recharge voltage.
- FIG. 26E is a diagram illustrating an example of a power supply method for the scan electrode and the common electrode and a relationship between the recharge voltage.
- FIG. 26E ' is a diagram showing a relationship between an example of a power supply method for the scan electrode and the common electrode and a recharge voltage.
- FIG. 27 is a circuit diagram of one pixel in another example of the display device of the present invention.
- FIG. 28A is a waveform diagram of an odd-numbered frame for describing a method of driving a display device according to another embodiment of the present invention.
- FIG. 28B is a waveform diagram of an even-numbered frame for describing a method of driving a display device according to another embodiment of the present invention.
- FIG. 29A is a waveform diagram of an odd-numbered frame for describing another driving method of the display device according to another embodiment of the present invention.
- FIG. 29B is a waveform diagram of an even-numbered frame for explaining another driving method of the display device according to another embodiment of the present invention.
- FIG. 30 is a diagram for explaining the magnitude relationship of the recharge voltage in the p-channel type TFT.
- FIG. 31 is a pixel configuration diagram when the present invention is applied to a display device using an organic electroluminescence element.
- FIG. 9 is a diagram illustrating a range of ⁇ hi gd and ⁇ a; st that can reduce both the luminance gradient and the frit force when st (E) ⁇ ast ( ⁇ ).
- FIG. 33A is a diagram in which the optimum distributions of C st and C gd in the display area are obtained by simulation.
- FIG. 33B is a diagram in which the optimum distribution of C st and C g d in the display area is obtained by simulation.
- FIG. 33C is a diagram in which the optimal distributions of C st and C g d in the display area are obtained by simulation.
- FIG. 33D is a diagram in which the optimum distributions of C st and C gd in the display area are obtained by simulation.
- the scanning signal (driving signal applied to the scanning electrode) and the common electrode control signal are supplied from both sides of the screen.
- a portion near the power supply end of the scanning electrode (and the common electrode), that is, both ends of the screen is literally called “a portion close to the power supply end”, and a center of the screen is called “a portion far from the power supply end”.
- V a -(C g d / C t o t) (Vg o n-V g o f f)
- the TFT does not go into the OFF state immediately when the scanning electrode potential falls, but becomes the OFF only when it passes the switching threshold (a potential that is higher than the video signal electrode potential by the threshold voltage). (However, TFT is turned off at the latest by the time the video signal electrode potential starts to shift toward the voltage for the next scanning period). Therefore, during a finite time from the start of the fall of the scan electrode potential to the passage of the switching threshold (the period indicated by To or Te in Fig. 17), the video signal electrode generated by the penetration and one pixel electrode (the TFT source) ⁇ Current flows through the TFT in an attempt to make up for the potential difference between the drains. Therefore, the absolute value of the actual change in the pixel electrode potential is smaller than IAVaI.
- the change in the pixel electrode potential is ⁇ Va + AVb.
- Figure 17 shows the change in pixel electrode potential Vd at this time. Is also shown.
- the current flowing in the TFT at this time is called a recharge current, and the voltage difference ⁇ Vb generated by this is called a recharge voltage.
- the switching threshold value described above is different between an even-numbered frame (when charging a video signal with a positive polarity) and an odd-numbered frame (when charging a video signal with a negative polarity).
- the scanning electrode potential shifts from Vg on to Vg off
- the switching threshold levels for the positive polarity and the negative polarity are drawn as shown in Figure 18. Based on this, the time until the TFT is turned off, that is, the period during which recharging occurs (corresponding to the above-mentioned To or Te) is determined for each of the part near and far from the power supply end. Is shown in the bar graph below.
- Equation 16 For reference, for the sake of simplicity, it is assumed that the falling waveform of the scanning electrode potential is the same in the even-numbered frame and the odd-numbered frame, but may not always be the same. In particular, the non-linearity of TFT channel capacitance (gate-source capacitance when TFT is ON, or Considering that the gate-drain capacitance is larger than that of the OFF), the negative polarity of the video signal apparently increases the capacitance, and therefore the CR time constant of the fall of the scanning electrode potential increases. The fall may be slower. However, even in such a case, the relation of (Equation 16) holds true.
- Vd o (O, +) V s i g (+)-st ⁇ V c (+)-g d AVg o n + AVb ( ⁇ , +)
- Vd o (O) V s i g (-)-a s t ⁇ V c (-)-a g d
- Vd o (E, +) V s i g (+)-st ⁇ V c (+)-g d AVg o n + AVb (E, +)
- Vd o (E) V s i g (one)-a s t ⁇ V c (one)-g ⁇
- Equation 17 the DC average level of the pixel electrode potential Vdc ( ⁇ ), Vdc (E), and the liquid crystal applied voltage effective value V eff ( ⁇ ) When V eff (E) is calculated, (Equation 18) is obtained.
- Vd c ( ⁇ ) [Vd o (O, +) + Vd o ( ⁇ )] / 2
- V d c (E) [V do (E, +) + V do (E)] / 2
- V e f f (E) [V do (E, +) — Vdo (E)] / 2
- V c p ⁇ V c (+)- ⁇ V c (one)
- the DC average levels Vdc (O) and Vdc (E) given by Equations 1 and 3 in (Equation 18) are the voltage applied to the liquid crystal if the potential of the counter electrode is made to match this value. Is the voltage value at which the time-average value becomes zero and the flicker force disappears. However, from (Equation 18) and (Equation 16), the relationship expressed by the following (Equation 20) is obtained, and the DC average level has a different value in the screen (from the feed end). The far part is larger than the near part), and it is impossible to eliminate flicker simultaneously on the entire screen.
- Vd c (E) -Vd c (O) [ ⁇ V b ( ⁇ , +) + ⁇ Vb ( ⁇ )] / 2-[ ⁇ V b ( ⁇ , +) + ⁇ Vb ( ⁇ )] / 2> 0
- V eff (E)-V eff ( ⁇ ) [ ⁇ V b (E, +)- ⁇ V b (E)] / 2-[ ⁇ Vb ( ⁇ , +)- ⁇ V b (O)] / 2 ⁇ 0
- the pixel electrode potential decreases due to penetration, but at the same time, the scan electrode formed by C gd and C st in FIG. Due to the capacitive coupling between the electrodes, the potential of the common electrode also decreases. This potential drop is small near the power supply end of the common electrode, but large at the farther part.
- the potential of the common electrode drops, the potential of the pixel electrode further drops due to the pull. Then, a higher recharge current flows toward the pixel electrode than when the common electrode potential does not change at all. Therefore, the pixel electrode holding potential at a portion far from the power supply end is significantly higher than that at a portion near the power supply end, and the problem of luminance gradient / frits force becomes more prominent.
- st and a gd are not constant in the screen (that is, at least one of C g d C st and C 1 c is not constant).
- st and a gd near the feed end are defined as st ( ⁇ ) and g d (O), respectively, and those far away are defined as a st ( ⁇ ) and a g d (E), respectively.
- ⁇ indicates a part near the power supply end
- E indicates a part far from the power supply end.
- V d o ( ⁇ , +) V s i g (+)-a s t (O) ⁇ V c (+)
- V d o (O, ⁇ ) V s i g (one)-st ( ⁇ ) ⁇ V c (one)
- V d o (E, +) V s i g (+)-st (E) ⁇ V c (+)
- V sig (sat) and ⁇ Vb (j, j) the value of ⁇ Vb was different between a portion near the power supply end and a portion far from the power supply end, so that Vdo was similarly different, and a frit force and a brightness gradient were generated.
- the difference between the values of AVb is corrected by independently changing the values of ast and agd of each two.
- the DC average levels Vdc (0) and Vdc (E) and the liquid crystal applied voltage effective values Veff (0) and Veff (E) are calculated from (Equation 17) and (Equation 18). Similarly to the calculation, when these are calculated from (Equation 22), the following (Equation 23) is obtained.
- Vd c ( ⁇ ) [V do (0, +) + V do ( ⁇ , one)] / 2
- V e f f ( ⁇ ) [V do (0, +) — Vd o ( ⁇ , one)] / 2
- Vd c (E) [Vd o (E, +) + V do (E,-)] / 2
- V e f f (E) [Vd o (E, +) -Vd o (E, one)] / 2
- V d c VD C (E)-VD C ( ⁇ )
- ⁇ (O) g d ( ⁇ ) + a st (O) ( ⁇ V c c / ⁇ V g on)
- ⁇ (E) g d (E) + «st (E) ( ⁇ V c c / ⁇ Vg on)
- ⁇ (E)-r (O) [ ⁇ Vb (E, +)- ⁇ V b (E, one)- ⁇ Vb ( ⁇ , +) + ⁇ V b (O, one)] / 2
- Equation 31 As described above, the flit force and the luminance gradient can be eliminated by selecting the key and) 3 successfully.
- the value of the key is smaller in the area far from the power supply end than in the area near the power supply end in the screen.
- iS The value of iS is farther from the power supply end compared to the area closer to the power supply end on the screen. Minutes are bigger
- the capacitance value contributing to ast and a; gd (in other words, the capacitance value that constitutes C tot)
- At least two of C st, C gd, or C 1c are defined as It is desirable to vary ast and agd by setting different values in the distant part.
- C gd and C 1 c are constant, and only C st is the part close to the feed end (the value of C st here is C st ( ⁇ )) and the part far from it ( (C st (E)), and C st (O) ⁇ C st (E), according to (Equation 14), gd ( ⁇ )> ⁇ gd (E), st ( ⁇ ) ⁇ st (E). Then, if V cp ⁇ 0, and V cc ⁇ 0 (this condition will be explained later as a supplementary explanation), then (Eq. 25) gives ⁇ (O)> r (E), and (Eq. 27) gives ( ⁇ )> ⁇ ( ⁇ ). Then, (Equation 29) is satisfied, but (Equation 31) is not. Therefore, the effect of reducing the luminance gradient is obtained, but the effect of reducing the frit is not obtained.
- the pattern of change of ⁇ and / 3 at each position in the screen is as follows.
- iS Some examples of iS are shown in Figure 19, and those of ⁇ are shown in Figure 20.
- the horizontal axis indicates the horizontal position on the screen, and the vertical axis indicates the value of 3 or.
- ⁇ , E, and M on the abscissa indicate a portion close to the power supply end, a portion far from the power supply end, and a portion in the middle between them.
- the simplest pattern is a pattern that changes linearly, as shown in Figure 19A or Figure 20A.
- a non-linear change can be considered as shown in FIGS. 19B and 20B, or a stepwise change can be made as shown in FIGS. 19C and 20C.
- a fixed portion and a portion having a certain slope are mixed. Both are common in that the values of j3 and ⁇ at the part near the power supply end and the part far from the power supply end satisfy (Equation 31) and (Equation 29). In any case, the effects of the present invention can be obtained.
- i3 tends to protrude upward between the part near and far from the power supply end, and a3 tends to protrude downward. Is preferable. The reason is shown below.
- the scan electrode can be regarded as a wiring having RC distribution circuit constants. Therefore, the scanning electrode is approximately represented by a five-stage RC circuit as shown in Fig. 21, where C is the total capacitance between the part near and far from the feed end, and R is the resistance. This can be considered as a cascade connection in which a portion between a portion near and far from the power supply end of the scanning electrode is divided into five equal parts, each of which is represented by a unit RC circuit as shown in FIG.
- Vg ⁇ , Vg1, Vg2, Vg3, Vg4, Vg5, and VgE in the figure are respectively .
- the distance from the feed end is 0 (part close to the feed end), LZ10, 3 L / 10, LZ2, 7 L / l 0, 9 L / l 0, and L (part far from the feed end) Phase to the potential at Hit.
- a voltage is supplied to the end closer to the power supply end by the scanning signal drive circuit.
- Vg 0 is the supply voltage of the scanning signal driving circuit
- Rg is the internal impedance of the scanning signal driving circuit.
- Figs. 19 and 20 assume that power is supplied from both sides, but since they are symmetric, it is sufficient to pay attention to only the left half or the right half.
- the circuit model in Fig. 21 is exactly the one that focuses on the left half of Figs. 19 and 20 only.
- Vg (n) -Vs ⁇ Vt, Vg (n) -Vd ⁇ Vt) Ids k ⁇ Vg (n) -Vs-Vt ⁇ 2
- I ds -k ⁇ V g (n)-Vd-V t ⁇ 2
- Vg (n) — V s ⁇ V t, Vg (n)-V d ⁇ V t) I d s 0
- k is a constant indicating the charge capacity of the TFT, and ⁇ 1; ? This is the threshold voltage of the Ding.
- the horizontal axis shows the normalized value as "0" for the part near the power supply end and "1" for the part far from the power supply end.
- the vertical axis also shows ⁇ Vb at a portion far from the power supply end normalized to “1”.
- the distribution of the recharge voltage has an upwardly convex shape.
- the resulting DC average level of the pixel electrode and the distribution of the effective value of the liquid crystal applied voltage also have the shape shown in FIG.
- the DC average level is upside-down because the right-hand side of (Equation 20) is positive. Must not). Therefore, the distribution of / 3 pairs for compensating the flit force (caused by the distribution of the DC average level) and the luminance gradient (caused by the distribution of the effective voltage of the liquid crystal applied voltage) caused by these is close to that in FIG. It is desirable that the shape, ie, jS, be as shown in Fig. 19B and that of Fig. 20B be as shown in Fig. 20B (of course, Fig. 19D and Fig. 20D are also acceptable).
- Equation 34 Note that the first expression in (Equation 34) is a conditional expression related to the frit force, and the second expression is the luminance gradient It is a conditional expression regarding.
- V cp in (Equation 19) is supplemented.
- V eff in (Equation 18) and (Equation 23) if the ast Vcp is negative, ignoring the third term related to recharging as small, the voltage applied to the liquid crystal
- the effective value of the voltage is a value larger than the video signal amplitude [V sig (+) — V sig (—)] / 2. This is because, as described in the background art, using a low-withstand voltage video signal driving IC (for example, up to 5 V), applying a voltage (for example, 10 to 15 V) that is higher than the withstand voltage to the liquid crystal. This is equivalent to the advantage of being able to do so. Therefore, it is desirable that st Vcp be negative. Since st is a capacitance ratio and is always positive, it is desirable that Vcp be negative.
- ⁇ V cc -(gd / st) ⁇ V gon (Equation 35) In this way, no DC voltage component is applied between the video signal electrode and the pixel electrode, and unnecessary ion generation in the liquid crystal or insulating film can be suppressed. Stability can be improved. Since AVg on, Q! Gd, and CK St are positive, ⁇ V cc is preferably negative.
- Figs. 26A to 26E show the predicted distribution (horizontal distribution) of how to generate the recharge voltage AVb.
- G indicates a scanning electrode
- C indicates a common electrode.
- the place where the square mark (mouth) is attached indicates that it is the power supply end.
- the dashed curve shows the recharge voltage when the potential fluctuation of the common electrode is not considered, and the thick solid curve shows that when the potential fluctuation of the common electrode is considered. If the potential of the common electrode is not considered, when the scanning electrode is fed on both sides ((A) and (B)), it is arched, and when it is fed on one side ((C),
- the luminance gradient ⁇ flicker generated by ⁇ Vb is corrected according to the shape of AVb in FIGS. 26A to 26E. ), It is most desirable to have a distribution of ⁇ and ⁇ (more precisely, I a
- the screen edge to which power is supplied to at least one of the scanning electrode and the common electrode is referred to as “a portion close to the power supply end”. That is, for all cases except (D), the screen Both ends are “parts near the feed end” (represented by the symbol “ ⁇ ” in Fig. 26). In (D), only one end is the “part close to the feed end”. In cases other than (D), the area near the center of the screen is referred to as the “part far from the power supply end” (represented by the symbol “E”). In case (D), the end that is not supplied with power is the “part far from the power supply end”. The position indicated by the symbol “M” in the figure is a portion that is halfway between the “portion near the power supply end” and the “portion far from the power supply end”.
- Vb ( ⁇ , +), Vb (0, 1), and Vb (E, tens) and Vb (E, 1) are used for the first and second equations in (Equation 16). It can be easily understood by replacing Vb in 26A to 26E in Fig. 26E. Regarding the third equation, as can be seen from Fig. 18, considering that the recharge voltage is much larger in the case of negative charge than in the case of positive charge, V b (0, +) — V b ( ⁇ , 1) and V b (E, +) – V b (E,-) are — V b (O, ⁇ ) And one Vb (E,-) can be regarded as the same, and since Equation 2 holds, Equation 3 holds.
- each pixel has the structure shown in FIG.
- the storage capacitance of each pixel may be connected to wiring other than the common electrode.
- it may be connected to a scanning electrode other than this stage (the example in the previous stage in this figure).
- the equation of the charge conservation law corresponding to (Equation 11) is given by (Equation 36).
- Equation 36 When the scanning electrode Vg (n) is selected, Vg (n— Since the selection in 1) has been completed, the potential is Vg off. By transforming (Equation 36), (Equation 37) is obtained.
- V d o (-) V s i g (-) — st ⁇ V c (one)-a g d
- Vd o (+) V s i g (+) st t V c (+) — a g d
- Equation 37 where AVgon, ⁇ Vc (ten), and ⁇ Vc (one) are expressed by (Equation 13), and agd, st are expressed by the following (Equation 38).
- the effect of the present invention can be obtained by changing the values of a st and a g d by making the value of C st 2 different between the portion near and far from the power supply end.
- connection destination of C st2 is a scan electrode at the subsequent stage, a scan electrode at two, three, etc., and a scan electrode at two, three, etc.
- C t 0 t is further generalized to include FIG. 14 and FIG. 27, and C t 0 t is considered as “sum of all capacitances electrically connected to the pixel electrode”, the explanation and supplementary explanation on the principle of the present invention will be given. All matters will apply.
- FIG. 1 is a plan view showing a pixel layout of the display device according to the first embodiment of the present invention.
- FIG. 2 is a sectional view taken along line AA ′ of FIG.
- 11 and 12 are substrates made of glass or the like
- 11 is an array substrate on which a thin film transistor 3 (also referred to as a TFT or a switching element) and electrodes connected thereto are formed
- Reference numeral 12 denotes an opposing substrate opposed thereto.
- a liquid crystal 13 as a display medium is sandwiched between the two substrates, and both ends thereof are sealed with a seal 17.
- Reference numerals 14 and 15 denote polarizing plates for displaying polarized light
- 19 denotes a color filter for displaying color.
- the color filter 19 is formed on the side of the counter substrate 12, it may be formed on the side of the array substrate 11.
- the scanning electrode 1 and the common electrode 4 are formed on the array substrate 11 by the first conductive layer, and the insulating film 18 covers the scanning electrode 1 and the common electrode 4.
- the pixel electrode 5 is formed by the second conductive layer on the insulating film 18. As shown in FIG. 2, a part of the pixel electrode 5 overlaps with the common electrode 4.
- the overlapping portion with the common electrode 4 constitutes the storage capacitor 7 (that is, the common electrode-pixel electrode capacitance C st).
- the overlapping portion between the pixel electrode 5 and the scanning electrode 1 forms the scanning electrode-pixel electrode capacitance C gd.
- a transparent electrode 20 is formed on the counter substrate 12.
- the transparent electrode 20 and the pixel electrode 5 face each other via a liquid crystal 13 as a display medium, thereby forming a liquid crystal capacitor C 1 c.
- the liquid crystal is a TN (twisted'nematic) liquid crystal.
- the thin film transistor 3 includes a semiconductor portion 9 and three electrodes.
- the gate electrode is connected to the scanning electrode 1
- the source electrode is connected to the video signal electrode 2
- the drain electrode is connected to the pixel electrode 5, respectively.
- FIG. 3 is a circuit configuration diagram of the display device according to the first embodiment of the present invention.
- one pixel has a capacitance Cst between the common electrode and the pixel electrode, a capacitance Cgd between the scanning electrode and the pixel electrode, and a liquid crystal capacitance C1c.
- it has a circuit structure similar to that of FIG.
- a display device is formed by arranging such pixels in a matrix.
- the video signal electrode 2 is connected to the video signal drive circuit 22
- the scan electrode 1 is connected to the scan signal drive circuit 21
- the common electrode 4 is connected to the common electrode potential control circuit 26.
- Reference numeral 23 denotes a display element excluding the drive circuit.
- FIG. 3 a portion close to the power supply end and a portion far from the power supply end are depicted.
- FIG. 1 shows a pixel rate at each portion.
- C st and C gd have different shapes in a portion near and far from the power supply end, and the capacitance value itself is also different (the capacitance value is different). Area is different).
- Luminance Gradient 'Principle of Fritz Force Reduction it is possible to realize a reduction of the luminance gradient ⁇ the flicker force.
- the video signal drive circuit has two types of video signals with different polarities depending on the display cycle (that is, positive and negative video signals based on the potential of the common electrode, V sig (+) and V sig in Fig. 15). (Equivalent to (—)) can be applied to the video signal electrode.
- the scanning signal drive circuit must be capable of applying at least two output potential levels (V g on and V g off f in FIG. 15).
- the common electrode potential control circuit must be able to apply at least two output potential levels (Vc (+) and Vc (—) in Figure 15).
- FIGS. 33A to 33D show the results of a simulation performed by applying specific numerical values to parameters such as the capacity in the present embodiment.
- This is the equivalent circuit of the entire display area in the circuit simulator. A path is constructed, and a DC average level (V dc) and a liquid crystal applied voltage effective value (V eff) at each position in the display area at that time are calculated.
- V dc DC average level
- V eff liquid crystal applied voltage effective value
- the scanning signal drive circuit and the common electrode potential control circuit first c which is also assumed to be powered from only the display area left, C st, C gd or "capacity inclination in each drawing that calculated for the case where C 1 c do not at all give a distribution in the display area, None ".
- FIG. 33A shows the distribution of C st and Fig. 33 B the distribution of C gd.
- the "normalized horizontal position" on the horizontal axis is the value obtained by normalizing the distance from the left edge of the display area to the width of the display area. "0" on the left and “1" on the right.)
- FIGS. 33C and 33D show the results of the DC average level and the liquid crystal applied voltage effective value, respectively.
- the value was selected so as to match the value in the case of "no inclination".
- the value of C st is inclined from 0.7 pF (left end) to 0.745 pF (right end), and as shown in Fig. 33 B, the value of ⁇ 3 (1 is set to 0.
- FIG. 4 In the second embodiment of the present invention, a configuration that achieves both a reduction in horizontal crosstalk and a reduction in the voltage of the video signal driving circuit IC will be described with reference to FIGS. 4 and 5.
- FIG. 4 In the second embodiment of the present invention, a configuration that achieves both a reduction in horizontal crosstalk and a reduction in the voltage of the video signal driving circuit IC will be described with reference to FIGS. 4 and 5.
- FIG. 4 is a plan view showing a pixel layout of a display device according to the second embodiment of the present invention.
- the configuration of FIG. 4 is basically similar to the pixel layout of FIG. 1, but is characterized in that the layout is inverted upside down for each column.
- the common electrode 4 is located halfway between the two scanning electrodes 1 in order to maintain the symmetry in the vertical direction.
- An insulating film 18 (not shown) is interposed between the pixel electrode 5 and the common electrode 4.
- a storage capacity 7 (C st) is formed.
- FIG. 5 is a circuit configuration diagram of a display device according to the second embodiment of the present invention. This is also basically the same as FIG. 3, but it is turned upside down for each column corresponding to the layout of FIG.
- the other of the storage capacitors connected to the pixel electrode (a plurality of pixels) of the pixel belonging to one scan electrode (eg, G 1) (the pixel whose ONZOF is controlled by the scan electrode G 1)
- G 1 the pixel whose ONZOF is controlled by the scan electrode G 1
- pixels belonging to a certain scanning electrode for example, G 1 are in different stages in even and odd columns (note, this is not necessarily an essential configuration of the present invention). is not).
- FIGS. 6A and 6B are waveform diagrams of an odd-numbered frame and an even-numbered frame for describing a driving method by dot inversion driving of the display device according to the second embodiment of the present invention.
- FIG. 6A in odd frames, video signal electrodes S 1 (and S 3, S 5,..., Sn,...) And S 2 (and S 4, S 6,. , S n + 1,...) are applied.
- the signal V sig (+) of the positive polarity is shown in S1 of FIG. 5, and the signal V sig of the negative polarity is shown in S2 in FIG. (1) is applied.
- the pixel above G 1 (called pixel P) is In the column belonging to S2 (more precisely, the column belonging to the video signal electrode to which a negative video signal is applied including S2), the pixel below G1 (called pixel Q) is in the ON state. What You.
- the common electrodes to which the storage capacitors of the pixels P and Q are connected are C 0 and C 1, respectively (based on G 1, these are referred to as a first common electrode and a second common electrode, respectively).
- C 0 the first common electrode
- C 1 the pixel P being charged to positive polarity
- the second common electrode can be set to a different potential such as V c (—), corresponding to the pixel P being charged to a negative polarity.
- dot inversion or column inversion driving which is an effective driving method for horizontal crosstalk
- the effect of increasing the amplitude of the pixel electrode holding potential can be obtained. Therefore, it is possible to reduce horizontal crosstalk and lower the voltage of the video signal drive circuit IC. That is, the second of the two objectives described above can be achieved. Note that this effect (both reduction of horizontal crosstalk and lowering of the voltage of the video signal drive circuit IC) is due to ast and agd as described in (Principle of the Invention 1: Principle of Luminance Slope / Fritz Force Reduction). Note that it is obtained independently of the in-screen distribution.
- dot inversion drive or column inversion drive is used to hold the pixel electrode as described in Japanese Patent Application Laid-Open No. H5-143021.
- the effect of increasing the amplitude of the potential is obtained.
- FIG. 4 depicts the case where C st ( ⁇ ) and C st (E), and C g d ( ⁇ ) ⁇ C g d (E).
- the video signal drive circuit is compatible with dot inversion or column inversion. That is, two types of video signals having different polarities can be simultaneously applied to a plurality of video signal electrodes, and when each video signal electrode is viewed, depending on the display cycle (odd frame or even frame) It is desirable to be able to apply two types of video signals with different polarities.
- the common electrode it is assumed that there are two common electrodes at the other connection destination of the storage capacitor connected to the pixel electrode belonging to that scan electrode with reference to a certain scan electrode.
- the pixels in the even-numbered columns and the pixels in the odd-numbered columns are completely symmetrical.
- the capacitance values (C gd , C st, etc.) may be different values for the even and odd columns.
- dot inversion or column inversion applies a signal of opposite polarity for each column (that is, divided into even and odd columns). This is generally the case, but this is not necessarily the case. For example, every two rows or a random arrangement of each polarity may be used.
- the pixels corresponding to the two polarities are arranged upside down, but the present invention is not necessarily limited to this. That is, there is a method in which only the common electrode to which the storage capacitor is connected is changed according to the polarity of the video signal electrode by using the structure shown in FIGS. However, in this case, in addition to the problem that the structure becomes asymmetric, the wiring for connecting the storage capacitor straddles other scanning electrodes etc. on the layout, causing extra capacitance and causing crosstalk. This is not desirable.
- FIG. 9 a display device using an in-plane switching (IPS) mode liquid crystal will be described with reference to FIGS. 9 and 10.
- FIG. 9 a display device using an in-plane switching (IPS) mode liquid crystal
- FIG. 9 is a plan view showing a pixel layout of a display device according to the fourth embodiment of the present invention.
- FIG. 10 is a sectional view taken along line AA ′ of FIG.
- 11 and 12 are substrates made of glass or the like
- 11 is an array substrate on which a thin film transistor and an electrode connected thereto are formed
- 12 is a counter substrate opposed thereto.
- Liquid crystal 13 is sandwiched between the two substrates, and both ends thereof are sealed with a seal 17.
- Reference numerals 14 and 15 denote polarizing plates for performing a polarization display, and 19 denotes a color filter for performing a color display.
- the color filter 1 is formed on the side of the counter substrate 12, it may be formed on the side of the array substrate 11.
- the scanning electrode 1 and the common electrode 4 are formed on the array substrate 11 by the first conductive layer, and the insulating film 18 covers the scanning electrode 1 and the common electrode 4.
- the pixel electrode 5 is formed by the second conductive layer on the insulating film 18. As shown in FIG. 10, the pixel electrode 5 overlaps the scanning electrode 1 in the preceding stage. The overlap with the scanning electrode 1 at the previous stage constitutes the storage capacitor 7 (C st). In addition, the overlapping portion between the pixel electrode 5 and the scanning electrode 1 at this stage forms a capacitance C gd between the scanning electrode and the pixel electrode.
- the common electrode 4 has a branched portion 4A. This opposes in parallel with the pixel electrode 5 and functions as a counter electrode for applying an electric field to the liquid crystal layer.
- the capacitance between the pixel electrode 5 and the common electrode 4 constitutes the capacitance C 1 c between the common electrode and the pixel electrode, where the capacitance via the liquid crystal layer and the two electrodes are geometrically overlapped. This includes both the capacitance formed by the process. Although it is difficult to calculate the capacitance via the liquid crystal layer using a formula or the like, it may be obtained by actual measurement or by simulation.
- the thin film transistor 3 includes a semiconductor portion 9 and three electrodes. The gate electrode is connected to the scanning electrode 1, the source electrode is connected to the video signal electrode 2, and the drain electrode is connected to the pixel electrode 5, respectively.
- FIG. 11 shows a circuit configuration of a display device according to the present embodiment using IPS mode liquid crystal.
- the unit pixel structure shown in FIG. The scanning electrode 1 is supplied with power from the scanning signal drive circuit 21, and the video signal electrode 2 is supplied with power from the video signal drive circuit 22.
- Equation 39 When the scanning electrode (Vg (n)) is selected, the selection period of the preceding scanning electrode (Vg (n-1)) has already ended, and the potential is Vg off. That is taken into account. By transforming (Equation 39), (Equation 40) is obtained.
- Vd o (-) V s i g (-)- ⁇ 1 c ⁇ V c (one)
- Vd o (+) V s i g (+) — ale Vc (+)
- the counter electrode (V f) in FIG. 3 (and FIG. 14) corresponds to the previous scanning in FIG. 11 (and FIG. 8), assuming that C st and C 1 c are interchanged. It turns out that it is an electrode.
- V f the counter electrode
- the scanning electrode of this stage since the potential Vg off is already in the non-selected state when the scanning electrode of this stage is selected, it can be considered to be the same as the counter electrode of FIG.
- an electrode having the same potential during the holding period and when the scanning electrode of this stage is selected can be used as the connection destination of Cst. This is the display medium, based on the pixel electrode.
- any electrode may be used except for the common electrode facing the pixel electrode via (liquid crystal: capacitance CI c) and the scanning electrode at this stage.
- a scanning electrode excluding this stage (which may be a later stage) or a common electrode other than the common electrode opposed via C 1 c is particularly desirable.
- FIG. 12 is a plan view showing a pixel layout of the display device according to the fifth embodiment of the present invention. This is the same as in the second embodiment, in which the IPS mode liquid crystal as in the fourth embodiment is configured to reduce horizontal crosstalk and reduce the voltage of the video signal drive circuit IC, and is laid out for each row. Is turned upside down.
- FIG. 13 is a circuit configuration diagram of a display device according to the fifth embodiment of the present invention. This corresponds to FIG. 5 showing the case where a TN liquid crystal is used, that is, the circuit configuration of the second embodiment.
- the IPS type configuration is used, and the dot inversion drive or the column inversion drive is used, as described in Japanese Patent Laid-Open No. Hei 5_1-43021, the amplitude of the pixel electrode holding potential. An increasing effect is obtained.
- the scanning electrode is supplied from one side and the potential of the common electrode is fixed on both sides (that is, a constant voltage is supplied).
- the way of generating the recharge voltage is shown in Fig. 26 (this is the case. In this way, the recharge voltage does not increase as the distance from the power supply side of the scan electrode increases, but it reaches a maximum at a certain position.
- the method of agd correction should be made in accordance with this, for example, the gd at the part farthest from the feeding end of the scanning electrode should be gd (Fd ), It is desirable that a position having a value of gd larger than agd (F) exists between a portion farthest from the power supply end of the scanning electrode and a portion closest to the power supply end.
- the scanning electrode is one-sided and the common electrode is only on the opposite side, as in 6E, and the potential is fixed. is there.
- FIG. 6A and FIG. 6B, FIG. 7A and FIG. 7B, or FIG. 15 show examples of the voltage waveforms in the driving method of the present invention. It is also possible to use driving waveforms such as 28B, 29A and 29B.
- FIGS. 28A and 28B show driving waveforms when driving the circuit having the configuration shown in FIG. 3 or FIG.
- the common electrode potential during the holding period is only one value of V coff, but in the driving waveforms of FIGS. 28A and 28B, the common electrode potential during the holding period is not necessarily required. It is characterized by two types of values, Vc (+) and Vc (—), instead of one type.
- Equation 42 This is obtained by changing Vc off of the second term on the right side (the term including C st) to Vc (—) or Vc (+) in the two equations of (Equation 11). None else. Then, instead of (Equation 13), if you put it as (Equation 43) below, (Equation 12) holds as it is.
- V c (+) V c (+) — V c (—)
- V c (one) V c (one) one V c (+)
- FIG. 29A and FIG. 29B show driving waveforms when driving the circuit having the configuration shown in FIG. 5 or FIG. This is compared with Figs. 6A and 6B.
- the common electrode potential during the holding period is not necessarily one type, but Vc (+) and Vc (-). The feature is that the values of the types are different.
- the scanning electrode G1 is selected, and a pixel electrode belonging to the video signal electrode S1 has a positive polarity signal, and a pixel electrode belonging to the video signal electrode S2 has a negative polarity signal.
- the potentials of the common electrodes C 0 and C 1 connected via the storage capacitors are V c (+) and V c ( ⁇ ), respectively, but during the holding period, V c (—) and V c ( ⁇ ) respectively. (+).
- the pixel electrode belonging to the video signal electrode S1 is charged with a negative polarity signal
- the pixel electrode belonging to the video signal electrode S2 is charged with a positive polarity signal (FIG. 2).
- the potentials of the common electrodes C 0 and C 1 are V c (—) and Vc (+), respectively, but during the holding period, V c (+) and Vc (—) The same applies to other scanning electrodes such as G O and G 2.
- FIGS. 6A and 6B, FIG. 7A and FIG. 7B, or FIG. 15 When the driving method shown in FIGS. 6A and 6B, FIG. 7A and FIG. 7B, or FIG. 15 is used, three potential levels of the common electrode potential control circuit are required. In the case of the form, only two potential levels are required. Therefore, the configuration of the common electrode potential control circuit can be simplified and the cost can be reduced, as compared with the driving method shown in FIGS. 6A and 6B, FIG. 7A and FIG. 7B, or FIG. There is an effect that can be.
- the switching element is an n-channel thin-film transistor (ON when the gate potential is higher than the threshold voltage and OFF when the gate potential is lower).
- Equation 45 Comparing (Equation 45) with (Equation 16), the relation of Equation 3 is the same, but the inequality sign is reversed in Equations 1 and 2. Then, (Equation 21) holds as it is, but in (Equation 20), the direction of the inequality sign is reversed.
- a condition for eliminating the luminance gradient and the frit force in this case will be considered.
- the condition for eliminating the luminance gradient the same relational expression as (Equation 29) is derived from the third expression of (Equation 28) and (Equation 45).
- the right side of (Equation 30) is negative according to the first and second equations of (Equation 45), but AVgon is also negative.
- the same relational expression is obtained. In other words, regardless of whether the thin film transistor is an n-channel type or a p-channel type, the luminance gradient and the frit force are eliminated. Are exactly the same expression, and all configurations of the present invention can be applied.
- one pixel When driving a liquid crystal, one pixel may be charged more than once within one frame (display period). For example, after writing a video signal within one frame, the video signal for black display may be written to improve the blur for the video (in general, one frame after writing the video signal. After 50 to 99% of the time has elapsed, video signals for black display are often written.) Or, in particular, when using a liquid crystal (also referred to as bend nematic LCD) in a ⁇ CB (optically compensated bend) mode, a video signal for black display may be similarly written to prevent reverse transition. Alternatively, a video signal may be written to perform pre-charge before 1H to 2H (1H is the horizontal cycle) before charging the pixel.
- a liquid crystal also referred to as bend nematic LCD
- ⁇ CB optical compensated bend
- a case occurs in which the video signal is simultaneously written to a plurality of rows (that is, the potentials of the scanning electrodes in a plurality of rows are simultaneously set to V gon).
- a black signal may be written to a plurality of rows at the same time, or pre-charging may be performed simultaneously with main charging of another pixel.
- the common electrode for example, in FIG.
- the potential of C 2 is varied according to the polarity of the video signal to be written, the effect of increasing the signal amplitude for each writing (charging) can be obtained, and there is no contradiction in driving. It can be performed.
- an overnight-type thin film transistor or MOSFET. This is because, when these semiconductor substrates are used, either a p-channel type or an n-channel type thin film transistor can be manufactured, so that the degree of freedom in designing a drive circuit is increased.
- the liquid crystal controls the optical state by the applied voltage (voltage drive), while the self-luminous diode, laser, and electoran luminescent material generally control the optical state by current. (Current drive).
- the pixel TFT controls the gate potential of another auxiliary TFT 25 (also called an auxiliary switching element), thereby controlling the current flowing into the organic electroluminescence element 24.
- auxiliary switching element also called an auxiliary switching element
- the sum of the gate-source capacitance and the gate-drain capacitance of the auxiliary TFT 25 may be regarded as C 1 c.
- the gate potential potential of the portion indicated by Vg (n) in FIG. 31
- the display area is changed to the potential Vd by the distribution of the recharge voltage in the display area. Inner distribution occurs and luminance gradient occurs.
- the effect of improving the luminance gradient can be obtained for the first time by making the value of the key not constant in the display area.
- this is because the polarity of the video signal of the capacitive coupling voltage superimposed on the pixel electrode from the common electrode is positive and negative. (In other words, the difference between when a positive voltage is applied to the display medium and when a negative voltage is applied to the display medium).
- the distribution of the capacitive coupling voltage in the display region is different between when a positive voltage is applied to the display medium and when a negative voltage is applied, so that the effect of improving the luminance gradient is obtained. It can be said that it can be done.
- the capacitive coupling voltage superimposed on the pixel electrode does not necessarily have to be from the common electrode. However, it is desirable to use a common electrode in order to freely adjust the potential in synchronization with the scanning electrode.
- a method of changing a value in a screen is basically performed by intentionally making such a layout (that is, a configuration). (By intentionally doing so in the total mask drawing).
- the design mask drawing is made as in the conventional example (that is, there is no difference between the layout of the pixel P and the pixel Q and it is uniform in the screen), for example, the intention is to align the mask at the time of manufacturing.
- the effect of the present invention can also be obtained by shifting the position.
- the capacitance value is most easily changed by changing the overlapping area of the two conductive layers in the capacitance formed by sandwiching the insulating layer between the two conductive layers (or the semiconductor layers). It is. However, by taking advantage of the capacitance created by the proximity of two conductive layers (or semiconductor layers) that do not overlap but are close together, by changing the gap between the two conductive layers on the layout Of course, a method of changing the capacity is also possible. Furthermore, it is not entirely impossible to change the capacitance by changing the thickness of the insulating layer and, in some cases, changing the dielectric constant.
- the scanning signal drive circuit is supplied with power from above, it may be supplied separately from below, or may be supplied from both upper and lower sides. Also, of course, power can be supplied alternately from every other row from above and below.
- the scanning signal is supplied from the left (or right) and the video signal is supplied from the top (or bottom). However, the scanning signal is supplied from the top (or bottom) separately, and the video signal is supplied from the left (or right).
- the present invention can be applied to a display device to which power is supplied from the display device.
- the display device has been described, but this indicates the entirety including the scan signal drive circuit and the video signal drive circuit.
- a portion that does not include a drive circuit and includes an array substrate, a counter substrate, and a liquid crystal at least is particularly called a “display element”.
- the effects of the present invention can be obtained for both the display device and the display element.
- the liquid crystal may be other than the TN liquid crystal and the IPS liquid crystal described above.
- a VA (vertical alignment) liquid crystal which has a relatively high response speed and a high contrast can be obtained, may be a MVA (multi-domain VA) liquid crystal, or may be another liquid crystal.
- TN twisted'nematic liquid crystal
- STN super fast nematic liquid crystal
- VA liquid crystal vertical alignment liquid crystal or homeotropic liquid crystal
- ECB electric field control birefringence
- homogeneous alignment liquid crystal Liquid crystal bent liquid crystal
- IPS in-plane switching
- GH guest / host liquid crystal
- polymer dispersed liquid crystal ferroelectric liquid crystal, antiferroelectric liquid crystal, OCB liquid crystal, discotic liquid crystal, and others
- the liquid crystal may be a normally white type (transmittance decreases as the applied voltage increases) or a normally black type liquid crystal (transmittance increases as the applied voltage increases).
- any material other than liquid crystal can be used as long as its optical characteristics change depending on the applied voltage.
- an electro-optic crystal such as BSO (bismuth 'silicon oxide) may be used.
- BSO bismuth 'silicon oxide
- it may be an electorifice chromic material, a self-luminous diode, a laser, an electroluminescent material, or the like.
- DMD Deformable Mirror Device
- liquid crystal is the cheapest and it is desirable to use it.
- a direct-view type liquid crystal display panel has been mainly described.
- a liquid crystal element polycrystalline Si type, single crystal Si type, or S ⁇ I (silicon Of course, it can also be applied to the “on” type.
- the display devices having a TN type structure (more generally, a structure in which a pixel electrode and a counter electrode form a parallel plate capacitor with a liquid crystal layer interposed therebetween) are described in the fourth to sixth embodiments.
- the display device having the IPS type structure (more generally, a structure in which the common electrode is formed on the same substrate as the pixel electrode and the liquid crystal is operated by an electric field parallel to the substrate) has been described.
- the first to third embodiments that is, the unit pixel circuit configuration in FIG. 14 may be implemented by an IPS type configuration.
- a common electrode (potential V c (n)) and a counter electrode (potential V f) may be separately formed on the substrate (the counter electrode may be separated for each row or each column).
- the fourth to sixth embodiments that is, the unit pixel circuit configuration in FIG. 8 may be implemented by a TN type configuration.
- the opposing electrode formed on the opposing substrate functions as a common electrode.
- the counter electrode is a single electrode common to the entire display area, so that the potential must be either Vc (+) or Vc (—) at all times when the entire screen is scanned.
- Vc (+) or Vc (—) the potential must be either Vc (+) or Vc (—) at all times when the entire screen is scanned.
- the counter electrode is insulated and separated for each row in the TN type configuration
- the opposing electrode potentials of the rows can be set individually, and the fourth to sixth embodiments can be realized as they are.
- C st and C 1 c can be regarded as mere parallel capacitances, and st + C 1 c can be considered to be equivalent to C 1 c in FIG. 8 (C st in FIG. 8 may be 0).
Description
Claims
Priority Applications (3)
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EP01936951A EP1300719B1 (en) | 2000-06-16 | 2001-06-11 | Active matrix display device and its driving method |
US10/049,583 US6963335B2 (en) | 2000-06-16 | 2001-06-11 | Active matrix type display apparatus method for driving the same, and display element |
US11/880,423 USRE41237E1 (en) | 2000-06-16 | 2001-06-11 | Active matrix type display apparatus, method for driving the same, and display element |
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JP2000-181101 | 2000-06-16 | ||
JP2000181101 | 2000-06-16 |
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PCT/JP2001/004918 WO2001096937A1 (fr) | 2000-06-16 | 2001-06-11 | Dispositif d'affichage a matrice active, procede de commande associe et element d'affichage |
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US (2) | US6963335B2 (ja) |
EP (1) | EP1300719B1 (ja) |
JP (2) | JP3723747B2 (ja) |
KR (1) | KR100517530B1 (ja) |
CN (1) | CN1289945C (ja) |
TW (1) | TWI293132B (ja) |
WO (1) | WO2001096937A1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
JP2005321770A (ja) | 2005-11-17 |
JP4106060B2 (ja) | 2008-06-25 |
EP1300719A1 (en) | 2003-04-09 |
US6963335B2 (en) | 2005-11-08 |
JP2002072989A (ja) | 2002-03-12 |
KR100517530B1 (ko) | 2005-09-28 |
CN1383497A (zh) | 2002-12-04 |
KR20020060161A (ko) | 2002-07-16 |
JP3723747B2 (ja) | 2005-12-07 |
US20020154084A1 (en) | 2002-10-24 |
TWI293132B (ja) | 2008-02-01 |
CN1289945C (zh) | 2006-12-13 |
EP1300719A4 (en) | 2006-08-16 |
EP1300719B1 (en) | 2012-10-24 |
USRE41237E1 (en) | 2010-04-20 |
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