WO2011108578A1 - 液晶表示装置 - Google Patents
液晶表示装置 Download PDFInfo
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- WO2011108578A1 WO2011108578A1 PCT/JP2011/054743 JP2011054743W WO2011108578A1 WO 2011108578 A1 WO2011108578 A1 WO 2011108578A1 JP 2011054743 W JP2011054743 W JP 2011054743W WO 2011108578 A1 WO2011108578 A1 WO 2011108578A1
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- liquid crystal
- auxiliary capacitance
- gate
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- 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
- 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
- G02F1/136286—Wiring, e.g. gate line, drain line
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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
- G09G3/3655—Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
-
- 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
- G02F1/134345—Subdivided pixels, e.g. for grey scale or redundancy
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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
- G02F1/13606—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit having means for reducing parasitic capacitance
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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
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0421—Structural details of the set of electrodes
- G09G2300/0426—Layout of electrodes and connections
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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
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0439—Pixel structures
- G09G2300/0443—Pixel structures with several sub-pixels for the same colour in a pixel, not specifically used to display gradations
- G09G2300/0447—Pixel structures with several sub-pixels for the same colour in a pixel, not specifically used to display gradations for multi-domain technique to improve the viewing angle in a liquid crystal display, such as multi-vertical alignment [MVA]
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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
- G09G2320/028—Improving the quality of display appearance by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction
Definitions
- the present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device in which each pixel has a plurality of subpixels.
- the liquid crystal display device is used not only as a large television but also as a small display device such as a display unit of a mobile phone.
- the viewing angle of a TN (Twisted Nematic) mode liquid crystal display device that has been often used in the past has been relatively narrow, but in recent years, a wide viewing angle liquid crystal display such as an IPS (In-Plane-Switching) mode and a VA (Vertical Alignment) mode.
- IPS In-Plane-Switching
- VA Very Alignment
- an MVA (Multi-domain Vertical Alignment) mode in which a plurality of liquid crystal domains are formed in one pixel region is known.
- an alignment regulating structure is provided on at least one liquid crystal layer side of a pair of substrates facing each other with a vertical alignment type liquid crystal layer interposed therebetween.
- the alignment regulating structure is, for example, a linear slit (opening) or a rib (projection structure) provided on the electrode.
- the optical axis direction of the liquid crystal molecules is the long axis direction of the molecules.
- the optical axis direction of the liquid crystal molecules is tilted to some extent with respect to the main surface of the substrate, and the viewing angle (viewing direction) is changed in this state.
- the display characteristics are greatly different from the display characteristics in the front direction.
- the display image viewed from the oblique direction looks generally whitish compared to the display image viewed from the front direction.
- Such a phenomenon is also called “whitening”.
- a human face even if the facial expression of the human face is viewed from the front without any sense of incongruity, it looks generally whitish when viewed from an oblique direction, and the subtle gradation expression of the skin color is crushed white. It may appear to be stuck.
- one pixel is divided into a plurality of (typically two) subpixels and the effective voltage applied to the liquid crystal layer of each subpixel is made different. It has been.
- the gradation characteristics of the sub-pixels are adjusted so that the display quality in the oblique direction does not deteriorate compared to the display quality in the front direction (see, for example, Patent Documents 1 to 3).
- FIG. 8 shows a liquid crystal display device 700 disclosed in Patent Document 1.
- the two subpixel electrodes 724a and 724b are connected to different source bus lines Ls via different TFTs 730a and 730b, and are driven so that the potentials of the two subpixel electrodes 724a and 724b are different.
- the voltages applied to the liquid crystal layers of the sub-pixels Spa and Spb are different due to the different potentials of the sub-pixel electrodes 724a and 724b in this way, the luminance of the sub-pixels Spa and Spb are different from each other, thereby improving whitening. Done.
- FIG. 9 shows a liquid crystal display device 800 disclosed in Patent Document 2.
- the two subpixel electrodes 824a and 824b are connected to the same source bus line Ls via different TFTs 830a and 830b.
- the two subpixel electrodes 824a and 824b are connected to the auxiliary capacitor bus lines Lcsa and Lcsb via the auxiliary capacitors CCa and CCb, and the potentials of the subpixel electrodes 824a and 824b are supplied to different auxiliary capacitor bus lines Lcsa and Lcsb. It is driven differently according to the change of the auxiliary capacitance signal voltage.
- the subpixel electrodes 824a and 824b have different potentials, so that the luminance of the subpixels Spa and Spb is different from each other, thereby improving whitening.
- FIG. 10 shows a liquid crystal display device 900 disclosed in Patent Document 3.
- two counter electrodes 944a and 944b having different potentials are provided for one pixel electrode 924. Since the voltages applied to the liquid crystal layers of the sub-pixels Spa and Spb are different due to the different potentials of the counter electrodes 944a and 944b in this way, the luminance of the sub-pixels Spa and Spb are different from each other, thereby improving whitening. Is called.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide a liquid crystal display device that suppresses variations in parasitic capacitance due to misalignment between a gate bus line and a subpixel electrode.
- the liquid crystal display device is a liquid crystal display device comprising an active matrix substrate, a counter substrate, and a liquid crystal layer provided between the active matrix substrate and the counter substrate, wherein the active matrix substrate is A plurality of pixel electrodes each defining a plurality of pixels, each including a pixel electrode having a first subpixel electrode and a second subpixel electrode; and a gate, a source, and a drain, respectively A plurality of thin film transistors including a first thin film transistor and a second thin film transistor; a first auxiliary capacitance electrode electrically connected to the drain of the first thin film transistor and the first subpixel electrode; And the drain of the second thin film transistor and the second subpixel current A plurality of auxiliary capacitance electrodes including a second auxiliary capacitance electrode electrically connected to the first auxiliary capacitance electrode and a first auxiliary capacitance electrically connected to the first auxiliary capacitance electrode forming the auxiliary capacitance with the first auxiliary capacitance electrode A plurality of auxiliary capacitance bus
- the liquid crystal display device includes a display area provided with the plurality of pixels and a peripheral area provided with the connection wiring.
- the plurality of pixel electrodes are arranged in a matrix in a row direction and a column direction, and the first gate wiring and the second gate wiring extend along the row direction.
- an overlapping area between the first gate line and the first subpixel electrode is substantially equal to an overlapping area between the second gate line and the second subpixel electrode.
- the distance between the center of the first subpixel electrode and the center of the second subpixel electrode, the distance between the centerline of the first gate line and the centerline of the second gate line, and The distance between the center line of the first auxiliary capacitor bus line and the center line of the second auxiliary capacitor bus line is substantially equal to each other.
- a first auxiliary capacitance signal is supplied to the first auxiliary capacitance bus line, and a second auxiliary capacitance signal different from the first auxiliary capacitance signal is supplied to the second auxiliary capacitance bus line.
- the liquid crystal layer is a vertical alignment type.
- the liquid crystal display device can suppress variations in parasitic capacitance caused by misalignment between the gate bus line and the subpixel electrode.
- FIG. 1 is a schematic diagram of an embodiment of a liquid crystal display device according to the present invention
- FIG. 2 is an equivalent circuit diagram of the liquid crystal display device shown in FIG. 1.
- FIG. 4 is a voltage waveform diagram of each signal in the liquid crystal display device shown in FIG. 3.
- FIG. 6 is an equivalent circuit diagram of the liquid crystal display device shown in FIG. 5.
- FIG. 6 is a voltage waveform diagram of each signal in the liquid crystal display device shown in FIG. 5.
- FIG. 2 is an equivalent circuit diagram of the liquid crystal display device shown in FIG. 1.
- FIG. 4 is a voltage waveform diagram of each signal in the liquid crystal display device shown in FIG. 3.
- FIG. 6 is an equivalent circuit diagram of the liquid crystal display device shown in FIG. 5.
- FIG. 6 is a voltage waveform diagram of each signal in the liquid crystal display device shown in FIG. 5.
- It is a schematic diagram of the conventional liquid crystal display device.
- It is a schematic diagram of another conventional liquid
- FIG. 1A shows a schematic diagram of a liquid crystal display device 100 of the present embodiment.
- the liquid crystal display device 100 includes an active matrix substrate 120, a counter substrate 140, and a liquid crystal layer 160 provided between the active matrix substrate 120 and the counter substrate 140.
- the active matrix substrate 120 has an insulating substrate 122 and pixel electrodes 124
- the counter substrate 140 has a transparent insulating substrate 142 and a counter electrode 144.
- the active matrix substrate 120 further includes a gate bus line, an auxiliary capacitance bus line, an insulating layer, a source bus line, a thin film transistor, an alignment film, and the like.
- the counter substrate 140 is further provided with a color filter layer, an alignment film, and the like.
- a polarizing plate is provided outside the active matrix substrate 120 and the counter substrate 140.
- the alignment film is a vertical alignment film
- the liquid crystal layer 160 is a vertical alignment type liquid crystal layer.
- the “vertical alignment type liquid crystal layer” refers to a liquid crystal layer in which a liquid crystal molecular axis (also referred to as “axis orientation”) is aligned at an angle of about 85 ° or more with respect to the surface of the vertical alignment film.
- the liquid crystal layer 160 includes a nematic liquid crystal material having negative dielectric anisotropy, and display is performed in a normally black mode in combination with a polarizing plate arranged in a crossed Nicol arrangement.
- the liquid crystal display device 100 further includes a backlight.
- the liquid crystal display device 100 is provided with pixels arranged in a matrix of a plurality of rows and a plurality of columns. Each pixel is defined by a pixel electrode 124. Each pixel has two or more sub-pixels that can have different luminances.
- a red pixel, a green pixel, and a blue pixel are provided.
- the red pixel, the green pixel, and the blue pixel are realized by arranging red, green, and blue color filters in the color filter layer.
- a color display pixel composed of such red pixels, green pixels, and blue pixels functions as a display unit of an arbitrary color.
- the color display pixel may further include another pixel (for example, a yellow pixel) in addition to the red, green, and blue pixels.
- FIG. 1B shows an equivalent circuit diagram of the liquid crystal display device 100.
- the liquid crystal display device 100 has a plurality of pixels P arranged in a matrix of a plurality of rows and a plurality of columns.
- FIG. 1B shows an equivalent circuit of one pixel P. Yes.
- Each pixel P has a sub-pixel Spa and a sub-pixel Spb whose luminance can be different from each other.
- the sub-pixel Spa and the sub-pixel Spb have the same area.
- the luminance of the sub-pixel Spa is different from the luminance of the sub-pixel Spb.
- one luminance is greater than the other luminance.
- the active matrix substrate 120 includes a pixel electrode 124, a thin film transistor (TFT) 130, a source bus line Ls, a gate bus line Lg, an auxiliary capacitance electrode EC, and an auxiliary capacitance bus line Lcs.
- the pixel electrode 124 includes a sub-pixel electrode 124a corresponding to the sub-pixel Spa and a sub-pixel electrode 124b corresponding to the sub-pixel Spb.
- Each TFT 130 has a gate, a source, and a drain.
- the TFT 130 is provided corresponding to the subpixels Spa and Spb.
- the TFT 130 corresponding to the sub-pixel Spa is referred to as TFT 130a
- the TFT 130 corresponding to the sub-pixel Spb is referred to as TFT 130b.
- the auxiliary capacitance electrode EC As the auxiliary capacitance electrode EC, the auxiliary capacitance electrode ECa electrically connected to the drain of the TFT 130a and the sub-pixel electrode 124a, and the auxiliary capacitance electrically connected to the drain of the TFT 130b and the sub-pixel electrode 124b.
- An electrode ECb is provided.
- the auxiliary capacitance bus line Lcs As the auxiliary capacitance bus line Lcs, the auxiliary capacitance bus line Lcsa electrically connected to the auxiliary capacitance counter electrode EOa forming the auxiliary capacitance electrode ECa and the auxiliary capacitance, and the auxiliary capacitance electrode ECb and the auxiliary capacitance electrode ECb.
- a storage capacitor bus line Lcsb electrically connected to the storage capacitor counter electrode EOb that forms a capacitor is provided.
- the auxiliary capacitance bus line Lcs may be referred to as a CS bus line Lcs.
- the source bus line Ls is electrically connected to the source of the TFT 130a and the source of the TFT 130b.
- the source bus line Ls extends along the column direction (y direction).
- the gate bus line Lg electrically connects the gate line Lga electrically connected to the gate of the TFT 130a, the gate line Lgb electrically connected to the gate of the TFT 130b, and the gate line Lga and the gate line Lgb.
- Connection wiring Lgc The gate wirings Lga and Lgb both extend along the row direction (x direction).
- the gate wiring Lga and the gate wiring Lgb are electrically connected via the connection wiring Lgc, the gate wiring Lga is equipotential with the gate wiring Lgb.
- An equivalent gate signal is supplied from a gate driver (not shown) to the gate wiring Lga and the gate wiring Lgb.
- a gate driver (not shown) to the gate wiring Lga and the gate wiring Lgb.
- two gate lines Lga and Lgb are provided for one row of pixels, but the gate lines Lga and Lgb are electrically connected by the connection line Lgc.
- the counter substrate 140 is provided with a counter electrode 144.
- the counter electrode 144 is shown corresponding to each of the subpixel electrodes 124a and 124b.
- the counter electrode 144 has a plurality of electrodes provided in the display area.
- a pixel electrode 124 corresponding to the entire pixel P is provided.
- the counter electrode 144 may be divided into a plurality of blocks.
- the sub-pixel Spa has a liquid crystal capacitor CLa and an auxiliary capacitor CCa
- the sub-pixel Spb has a liquid crystal capacitor CLb and an auxiliary capacitor CCb
- the liquid crystal capacitor CLa includes a subpixel electrode 124a, a counter electrode 144, and a liquid crystal layer 160 provided therebetween.
- the liquid crystal capacitor CLb includes a subpixel electrode 124b, a counter electrode 144, and a liquid crystal layer 160 provided therebetween.
- the auxiliary capacitance CCa is configured by an auxiliary capacitance electrode ECa, an auxiliary capacitance counter electrode EOa, and an insulating layer provided therebetween.
- the auxiliary capacitor CCb includes an auxiliary capacitor electrode ECb, an auxiliary capacitor counter electrode EOb, and an insulating layer provided therebetween.
- the subpixels Spa and Spb may be referred to as a first subpixel Spa and a second subpixel Spb, respectively, and the subpixel electrodes 124a and 124b are respectively referred to as a first subpixel electrode 124a and a second subpixel.
- the TFTs 130a and 130b may be referred to as a first thin film transistor 130a and a second thin film transistor 130b.
- the gate lines Lga and Lgb may be referred to as a first gate line Lga and a second gate line Lgb, respectively, and the auxiliary capacitance electrodes ECa and ECb are referred to as a first auxiliary capacitance electrode ECa and a second auxiliary capacitance electrode ECb, respectively.
- the auxiliary capacitance bus lines Lcsa and Lcsb may be referred to as the first auxiliary capacitance bus line Lcsa or CS bus line Lcsa and the second auxiliary capacitance bus line Lcsb or CS bus line Lcsb, respectively, and are supplied to the CS bus lines Lcsa and Lcsb.
- the auxiliary capacitance signals that are performed may be referred to as first and second auxiliary capacitance signals, respectively.
- FIG. 2 shows a schematic diagram of the liquid crystal display device 100.
- the counter substrate 140 is omitted in order to avoid an excessively complicated drawing
- FIG. 2 corresponds to a top view of the active matrix substrate 120.
- the first subpixel electrode 124a defines the first subpixel Spa
- the second subpixel electrode 124b defines the second subpixel Spb.
- the liquid crystal display device 100 has a display area RD and a peripheral area RS.
- a pixel P is provided in the display region RD, and a connection wiring Lgc is provided in the peripheral region RS.
- the gate lines Lga and Lgb and the CS bus lines Lcsa and Lcsb extend along the row direction (x direction), and the source bus line Ls extends along the column direction (y direction).
- the CS bus line Lcs is provided so as to overlap between the sub-pixels Spa and Spb in one pixel P and between the pixels P adjacent in the column direction.
- the gate bus line Lg includes the gate lines Lga and Lgb and the connection line Lgc.
- the connection wiring Lgc is formed of the same material in the same process as the gate wirings Lga and Lgb. However, the connection wiring Lgc may be formed from a different material in a different process from the gate wiring Lga and the gate wiring Lgb.
- the gate wiring Lga and the gate wiring Lgb may be formed from tungsten (W), whereas the connection wiring Lgc may be formed from aluminum (Al).
- two TFTs 130a1 and 130a2 are provided corresponding to the sub-pixel Spa, and the TFTs 130a1 and 130a2 are arranged in series.
- two TFTs 130b1 and 130b2 are provided corresponding to the sub-pixel Spb, and the TFTs 130b1 and 130b2 are arranged in series.
- two TFTs 130a1, 130a2, 130b1, and 130b2 are provided corresponding to the sub-pixels Spa and Spb, respectively, but only one TFT is provided corresponding to the sub-pixels Spa and Spb. There may be.
- the source, channel, and drain of the TFTs 130a1, 130a2, 130b1, and 130b2 are provided in the semiconductor layer Se, respectively. Impurities are introduced into regions of the semiconductor layer Se other than the regions serving as the channels of the TFTs 130a1, 130a2, 130b1, and 130b2, and the carrier concentration is increased.
- the gates of the TFTs 130a1 and 130a2 are electrically connected to the common gate line Lga, and the gates of the TFTs 130b1 and 130b2 are electrically connected to the common gate line Lgb.
- the on / off states of the TFTs 130a1, 130a2, 130b1, and 130b2 similarly change according to the gate signal voltages supplied to the gate wirings Lga and Lgb.
- the TFTs 130a1 and 130a2 are collectively referred to as the TFT 130a
- the TFTs 130b1 and 130b2 are collectively referred to as the TFT 130b.
- the sources of the TFTs 130a and 130b are electrically connected to the source bus line Ls through a contact hole provided in the insulating layer.
- the drains of the TFTs 130a and 130b are electrically connected to the subpixel electrodes 124a and 124b through contact holes provided in the insulating layer, respectively.
- the shortest distance between the semiconductor layer Se and the CS bus line Lcs is relatively short, and an auxiliary capacitor is formed between the semiconductor layer Se and the CS bus line Lcs.
- the portion that forms the auxiliary capacitance with the first CS bus line Lcsa is the first auxiliary capacitance electrode ECa
- the portion that forms the auxiliary capacitance with the second CS bus line Lcsb is the second auxiliary capacitance electrode ECb.
- the portion of the CS bus line Lcsa that forms the auxiliary capacitance with the semiconductor layer Se is the first auxiliary capacitance counter electrode EOa
- the portion of the CS bus line Lcsb that forms the auxiliary capacitance with the semiconductor layer Se is the second auxiliary capacitance.
- This is the counter electrode EOb.
- the storage capacitor counter electrodes EOa and EOb are provided integrally with the CS bus lines Lcsa and Lcsb, but the storage capacitor counter electrodes EOa and EOb may be provided separately from the CS bus lines Lcsa and Lcsb.
- the auxiliary capacitance electrodes ECa and ECb are provided as part of the semiconductor layer Se. However, the auxiliary capacitance electrodes ECa and ECb may be provided separately from the semiconductor layer Se.
- the gate bus line Lg has the gate lines Lga and Lgb to which equivalent gate signals are supplied.
- the two sides that define the width of the gate line Lga are located between the two sides that define the length along the column direction (y direction) of the subpixel electrode 124a.
- the two sides defining the width of the gate wiring Lgb are located between the two sides defining the length along the column direction of the sub-pixel electrode 124b.
- the subpixel electrode 124a is disposed so as to straddle the gate line Lga
- the subpixel electrode 124b is disposed so as to straddle the gate line Lgb.
- the width of the gate wiring Lga is substantially equal to that of the gate wiring Lgb
- the width of the gate wirings Lga and Lgb is, for example, 4 ⁇ m
- the overlapping area of the gate wiring Lga and the subpixel electrode 124a is the same as that of the gate wiring Lgab and the subpixel electrode. It is approximately equal to the overlapping area with 124b.
- the subpixel electrodes 124a and 124b are adjacent to each other in the column direction.
- the subpixel electrode 124a has the same shape as the subpixel electrode 124b.
- the lengths of the subpixel electrodes 124a and 124b along the column direction are the subpixel electrodes 124a and 124b. About 1.5 times the length of each along the row direction.
- the subpixel Spa and the subpixel Spb have the same configuration. Specifically, the distance between the center of the subpixel electrode 124a and the center of the subpixel electrode 124b, the distance between the center line of the gate wiring Lga and the center line of the gate wiring Lgb, and the center line of the CS bus line Lcsa and CS The distances from the center line of the bus line Lcsb are substantially equal to each other. For example, these distances are about 1.5 times the respective lengths along the row direction of the subpixel electrodes 124a and 124b. As described above, the sub-pixel Spa and the sub-pixel Spb are configured to be congruent with each other.
- writing to the pixel P is performed as follows.
- the gate signal voltage supplied to the gate bus line Lg changes from the off voltage to the on voltage.
- the gate line Lga is electrically connected to the gate line Lgb through the connection line Lgc, and an ON voltage is applied to the gate bus line Lg so that the first thin film transistor 130a and the second thin film transistor 130b are in the ON state.
- the source signal applied to the source bus line Ls is supplied to the sub-pixel electrodes 124a and 124b via the TFTs 130a and 130b.
- the TFTs 130a and 130b change to the off state. Strictly speaking, immediately after the TFTs 130a and 130b change to the OFF state, the potentials of the subpixel electrodes 124a and 124b decrease approximately the same due to a pull-in phenomenon based on the influence of the parasitic capacitances and the like of the TFTs 130a and 130b. However, the subpixel electrodes 124a and 124b have substantially the same potential.
- auxiliary capacitance signal voltage supplied to the CS bus lines Lcsa and Lcsb changes, and the potentials of the subpixel electrodes 124a and 124b change according to the change of the auxiliary capacitance signal voltage.
- These auxiliary capacitance signal voltages change so that the periods of the high voltage and the low voltage are substantially equal until the same gate bus line Lg is selected next after the gate bus line Lg is selected.
- these auxiliary capacitance signals include an oscillating waveform that changes to a high voltage and a low voltage every equal period.
- the auxiliary capacitance signal voltages supplied to the CS bus lines Lcsa and Lcsb change in different directions, and the potentials of the sub-pixel electrodes 124a and 124b change in different directions according to changes in the auxiliary capacitance signal voltage.
- the initial change of the auxiliary capacitance signal voltage supplied to the CS bus line Lcsa is an increase after the TFTs 130a and 130b change to the off state
- the first of the auxiliary capacitance signal voltage supplied to the CS bus line Lcsb is increased. Change is a decrease.
- the average potential of the subpixel electrode 124a increases and the average potential of the subpixel electrode 124b decreases.
- the initial change in the auxiliary capacitance signal voltage supplied to the CS bus line Lcsa is a decrease
- the initial change in the auxiliary capacitance signal voltage supplied to the CS bus line Lcsb is an increase.
- the average potential of the subpixel electrode 124a decreases and the average potential of the subpixel electrode 124b increases.
- the auxiliary capacitance signal voltage is the same as the gate signal voltage supplied to the next selected gate bus line Lg (typically the gate bus line adjacent to the previously selected gate bus line). It may change before the time of changing to, or may change after that time. As described above, by supplying different first and second auxiliary capacitance signals to the first and second CS bus lines Lcsa and Lcsb, the effective voltages of the sub-pixels Spa and Spb can be made different. Thus, the viewing angle dependency of the ⁇ characteristic can be improved.
- the counter electrode 144 in the next vertical scanning period (next field period or next frame period). Is higher than the subpixel electrodes 124a and 124b.
- the polarity of the pixel P is inverted every vertical scanning period.
- the fact that the potential of the subpixel electrode is higher than that of the counter electrode is indicated as + (plus), and the case where the potential of the counter electrode is higher than that of the subpixel electrode is indicated as ⁇ (minus).
- the polarity represents the direction of the electric field applied to the liquid crystal layer.
- Such polarity inversion suppresses most of the DC component of the voltage applied to the liquid crystal layer.
- the DC component cannot be completely removed by this alone.
- the potential of the subpixel electrode decreases due to the pulling phenomenon, and the voltage drop due to the pulling phenomenon occurs in a certain direction regardless of the polarity. For this reason, the DC component due to the pull-in phenomenon cannot be sufficiently removed only by polarity inversion.
- the median value of the potential of the subpixel electrode that is inverted every vertical scanning period (also referred to as the DC level of the drain voltage or the effective level of the drain voltage) is the voltage of the counter electrode. By adjusting the voltage of the counter electrode so as to substantially match, the DC component due to the pull-in phenomenon is removed.
- the sub-pixels Spa and Spb of each pixel P correspond to different source bus lines Ls, and two source bus lines are provided corresponding to one column of pixels. For this reason, the aperture ratio decreases, the processing amount of the source driver increases, and the power consumption increases.
- the subpixels Spa and Spb of each pixel P correspond to a common source bus line Ls. For this reason, it is possible to suppress a decrease in aperture ratio and suppress an increase in power consumption.
- the counter electrode 944 of the counter substrate is used for each of the subpixels Spa and Spb of each pixel.
- the counter electrode 944a and 944b are provided with counter electrodes 944a and 944b to which different counter voltages can be applied.
- the counter electrode 144 is common to the subpixels Spa and Spb belonging to each pixel P. For this reason, the leak of the counter electrode 144 can be suppressed.
- the gate bus line Lg is provided between the sub-pixel electrode 824a and the sub-pixel electrode 824b.
- the alignment of the photomask in forming the gate bus line Lg is shifted in the column direction, the parasitic capacitance between the subpixel electrode 824a and the gate bus line Lg and the gap between the subpixel electrode 824b and the gate bus line Lg
- the parasitic capacitance of the fluctuates greatly. For example, according to the alignment shift, the overlapping area between one of the subpixel electrodes 824a and 824b and the gate bus line Lg increases, and the overlapping area between the other subpixel electrode and the gate bus line Lg.
- the parasitic capacitance between the sub-pixel electrode 824a and the gate bus line Lg and the parasitic capacitance between the sub-pixel electrode 824b and the gate bus line Lg are different.
- the pull-in voltage Vd differs between the sub-pixel Spa and the sub-pixel Spb
- the effective voltages of both the two sub-pixels cannot be sufficiently optimized. For example, if the DC level of the drain voltage of the sub-pixel Spa matches the counter voltage, the DC level of the drain voltage of the sub-pixel Spb does not match the counter voltage, and a DC component is applied to the liquid crystal layer of the sub-pixel Spb. As a result, the display quality deteriorates.
- the subpixel electrode 124a since the first subpixel electrode 124a straddles the first gate line Lga and the second subpixel electrode 124b straddles the second gate line Lgb, the subpixel electrode 124a. , 124b and the gate bus line Lg are slightly misaligned, the variation in the overlapping area between the subpixel electrodes 124a, 124b and the gate wirings Lga, Lgb can be suppressed, and the subpixel electrodes 124a, 124b and the gate wirings can be suppressed. Variations in parasitic capacitance with Lga and Lgb can be suppressed.
- the effective voltages of the two subpixels Spa and Spb can both be optimized, and the deterioration of display quality can be suppressed.
- two gate lines Lga and Lgb are provided for one row of pixels.
- the gate lines Lga and Lgb are electrically connected by a connection line Lgc provided in the peripheral region RS. Therefore, it is not necessary to increase the number of terminals of a gate driver (not shown), and an increase in power consumption can be suppressed.
- the parasitic capacitances of the subpixels Spa and Spb are made substantially constant even if there is some variation during production.
- the direct current components applied to the liquid crystal layers of the sub-pixels Spa and Spb can be made substantially the same, and as a result, the counter voltage can be adjusted optimally to cancel the direct current components.
- Such a liquid crystal display device 100 is manufactured as follows, for example.
- the production of the active matrix substrate 120 is performed as follows. First, the gate bus line Lg and the CS bus line Lcs are formed on the insulating substrate 122.
- the insulating substrate 122 is a glass substrate.
- the gate lines Lga and Lgb, the connection line Lgc, and the CS bus line Lcs are formed from the same material in the same process.
- the connection wiring Lgc may be formed from a different material in a different process from the gate wirings Lga and Lgb.
- the source bus line Ls is formed on the insulating layer covering the gate bus line Lg and the CS bus line Lcs. A part of this insulating layer functions as a gate insulating film of the TFT 130.
- the semiconductor layer Se is, for example, an amorphous semiconductor layer (typically an amorphous silicon layer).
- the semiconductor layer Se may be a polycrystalline semiconductor layer (typically a polysilicon layer) or an oxide semiconductor layer.
- impurities may be introduced into a predetermined region of the semiconductor layer Se as necessary.
- the pixel electrode 124 is formed of a transparent conductive film (typically, Indium Tin Oxide: ITO). Thereafter, an alignment film covering the pixel electrode 124 is formed.
- ITO Indium Tin Oxide
- the gate wirings Lga, Lgb, the CS bus line Lcs, the source bus line Ls, and the pixel electrode 124 are each exposed by etching using a photoresist using a photomask after depositing a conductive material. Formed by doing.
- the semiconductor layer Se is formed by depositing a semiconductor material, performing exposure using a photoresist using a photomask, and performing etching.
- the active matrix substrate 120 is manufactured as described above.
- the counter substrate 140 is manufactured as follows. First, the counter electrode 144 is formed on the transparent insulating substrate 142.
- the transparent insulating substrate 142 is a glass substrate.
- An alignment film is provided on the surface of the counter substrate 140.
- the counter substrate 140 is provided with a color filter layer as necessary. The color filter layer has red, green and blue color filters and a black matrix surrounding each color filter. In this way, the counter substrate 140 is manufactured.
- the active matrix substrate 120 and the counter substrate 140 are bonded together.
- a sealant is applied in a rectangular frame shape to one of the active matrix substrate 120 and the counter substrate 140, and a liquid crystal material is dropped into a region surrounded by the sealant.
- the active matrix substrate 120 and the counter substrate 140 are bonded together, and the sealing agent is cured.
- the liquid crystal material can be applied uniformly and in a short time, and batch processing can be performed on the mother glass substrate. Furthermore, the amount of discarded liquid crystal material can be reduced and the liquid crystal material can be used efficiently.
- a sealing agent in a partially opened rectangular frame shape is formed by bonding the active matrix substrate 120 and the counter substrate 140, and then A liquid crystal material may be injected between the active matrix substrate 120 and the counter substrate 140. Thereafter, the sealing agent is cured.
- this sealing agent has thermosetting properties, and the sealing agent is cured by heat treatment.
- a retardation plate is applied to the respective insulating substrates 122 and 142 of the active matrix substrate 120 and the counter substrate 140 as necessary, and then a polarizing plate is applied.
- the liquid crystal display device 100 is manufactured as described above.
- FIG. 3 shows an equivalent circuit diagram of the liquid crystal display device 100.
- FIG. 3 shows an equivalent circuit of a plurality of pixels P.
- the source bus lines corresponding to the pixels in the m-th and m + 1-th columns are indicated as Lsm and Lsm + 1
- the gate bus lines corresponding to the pixels in the n-th row to the (n + 3) -th row are indicated as Lgn to Lgn + 3. Yes.
- the CS bus line Lcs is shown not to overlap each pixel P in order to avoid an excessively complicated drawing.
- CS bus lines Lcsa and Lcsb are provided for each row of pixels P, and a CS bus line Lcs is provided for each row of subpixels.
- Auxiliary capacitance signals are supplied to the CS bus lines Lcsa and Lcsb from the auxiliary capacitance trunk lines Ltcsa and Ltscsb, respectively.
- an auxiliary capacitance signal is supplied from the auxiliary capacitance trunk lines Ltcsa and Ltscsb to the CS bus lines Lcsa and Lcsb corresponding to the pixels in the n-th row, respectively, and the CS bus lines Lcsa and Lcsb corresponding to the pixels in the n + 1-th row are respectively supplied.
- auxiliary capacity signals are supplied from the auxiliary capacity trunk lines Ltcsa and Ltcsb, respectively.
- an equivalent auxiliary capacitance signal is supplied to the sub-pixel Spa of the pixel P in each row, and an equivalent auxiliary capacitance signal is supplied to the sub-pixel Spb.
- FIG. 4 shows a voltage waveform diagram of the liquid crystal display device 100.
- VLsm indicates the voltage waveform of the source signal supplied to the source bus line Lsm with reference to the voltage of the counter electrode 144 indicated by a broken line
- VLgn to VLgn + 3 are supplied to the gate bus lines Lgn to Lgn + 3.
- VLcsa and VLcsb are voltage waveforms of the auxiliary capacitance signals supplied to the CS bus lines Lcsa and Lcsb.
- VCLa m, n to VCLa m and n + 3 respectively indicate the potential of the sub-pixel electrode 124a of the pixel P in the n-th row and m-th column to the (n + 3) -th row and m-th column with reference to the potential of the counter electrode 144
- m, n to VCLb m and n + 3 respectively indicate the potential of the sub-pixel electrode 124b of the pixel P in the n-th row and m-th column to the (n + 3) -th row and m-th column with reference to the potential of the counter electrode 144.
- an input signal for making all the pixels have the same gradation level is input.
- the auxiliary capacitance signal voltage VLcsa supplied to the auxiliary capacitance trunk line Ltcsa and the auxiliary capacitance signal voltage VLcsb supplied to the auxiliary capacitance trunk line Ltcsb are both oscillation voltages including a rectangular wave with a duty ratio of 1: 1. Each period is twice the horizontal scanning period (2H). The phase of the auxiliary capacitance signal voltage VLcsb is delayed by 1 H time compared to the auxiliary capacitance signal voltage VLcsa.
- the gate signal voltage VLg of the gate bus line Lg corresponding to each auxiliary capacitance main line is turned on.
- the time at which the voltage changes from the voltage to the off voltage coincides with the time at the center of the period when the auxiliary capacitance signal voltages VLcsa and VLcsb are constant, and the time at which the gate signal voltage VLg changes to the off voltage and the auxiliary capacitance signal voltage VLcsa.
- the difference Td from the time when VLcsb changes is 0.5H hours.
- Td is not limited to this, and the value of Td may be in a range that is larger than 0H and shorter than the cycle (here, 1H time) in which auxiliary capacitance signal voltages VLcsa and VLcsb are inverted.
- writing to the pixel P in the liquid crystal display device 100 will be described.
- First, writing to the pixels P in the nth row will be described.
- the pixel P in the n-th row and the m-th column and the n-th row and the (m + 1) -th column is focused on.
- the gate signal voltage supplied to the gate wirings Lga and Lgb changes from the off voltage to the on voltage, whereby the TFTs 130a and 130b in the nth row, the mth column, and the nth row, the m + 1th column are turned on.
- the source signal voltage supplied to the source bus line Lsm is applied to the subpixel electrodes 124a and 124b in the nth row and mth column and supplied to the source bus line Lsm + 1.
- the source signal voltage thus applied is applied to the sub-pixel electrodes 124a and 124b in the nth row and the (m + 1) th column.
- the potential of the subpixel electrodes 124a and 124b in the nth row and mth column is higher than the potential of the counter electrode 144.
- the potentials of the sub-pixel electrodes 124 a and 124 b in the n-th row and the (m + 1) -th column are lower than the potential of the counter electrode 144.
- the relationship between the potential of the subpixel electrodes 124a and 124b in the nth row and the mth column and the potential of the counter electrode 144 is the same as the potential of the subpixel electrodes 124a and 124b in the nth row and the (m + 1) th column and the potential of the counter electrode 144. Different from the relationship with the potential.
- the gate signal voltage supplied to the gate wirings Lga and Lgb changes from the on voltage to the off voltage, whereby the TFTs 130a and 130b in the nth row, the mth column, and the nth row, the m + 1th column change to the off state. .
- the potentials of the sub-pixel electrodes 124a and 124b decrease substantially the same due to a pull-in phenomenon based on the influence of the parasitic capacitances and the like of the TFTs 130a and 130b.
- the potentials of the subpixel electrodes 124a and 124b in the nth row and mth column are equal to each other, and the potentials of the subpixel electrodes 124a and 124b in the nth row and m + 1th column are equal to each other.
- the storage capacitor signal voltage supplied to the CS bus lines Lcsa and Lcsb changes in different directions, and thereby the potentials of the sub-pixel electrodes 124a and 124b change in different directions.
- the initial change of the auxiliary capacitance signal voltage VLcsa after the TFT 130a changes to the off state is an increase, and the average potential of the subpixel electrode 124a increases.
- the initial change in the auxiliary capacitance signal voltage VLcsb after the TFT 130b is turned off is a decrease, and the average potential of the sub-pixel electrode 124b is decreased.
- a sub-pixel having a high luminance among the sub-pixels Spa and Spb is also referred to as a bright sub-pixel
- a sub-pixel having a low luminance among the pixels Spa and Spb is also referred to as a dark sub-pixel.
- the average potential of the subpixel electrode 124a also increases in accordance with the auxiliary capacitance signal voltage VLcsa in the pixel P in the nth row and the (m + 1) th column, and the average potential of the subpixel electrode 124b is also increased by the auxiliary capacitance. It decreases according to the signal voltage VLcsb.
- the polarity of the pixel P in the nth row and the (m + 1) th column is negative, the luminance of the subpixel Spb in the pixel P in the nth row and the (m + 1) th column is higher than that of the subpixel Spa.
- the polarity of the pixel P in the nth row and the m + 1th column is inverted from the polarity of the pixel P in the nth row and the mth column.
- the polarities of pixels adjacent in the row direction of the nth row are similarly reversed.
- the subpixel Spa is a bright subpixel
- the subpixel Spb is a bright subpixel.
- the gate signal voltage supplied to the gate bus line Lgn + 1 changes from the off voltage to the on voltage, and the TFTs 130a and 130b in the (n + 1) th row and the mth column and the (n + 1) th row and the (m + 1) th column are turned on.
- the source signal voltage supplied to the source bus line Lsm is applied to the subpixel electrodes 124a and 124b in the (n + 1) th row and the mth column and supplied to the source bus line Lsm + 1.
- the source signal voltage thus applied is applied to the subpixel electrodes 124a and 124b of the (n + 1) th row and the (m + 1) th column.
- the potential of the subpixel electrodes 124a and 124b in the (n + 1) th row and the mth column is lower than the potential of the counter electrode 144.
- the potentials of the subpixel electrodes 124a and 124b in the (n + 1) th row and the (m + 1) th column are higher than the potential of the counter electrode 144.
- the relationship between the potential of the subpixel electrodes 124a and 124b in the (n + 1) th row and the mth column and the potential of the counter electrode 144 is the same as the potential of the subpixel electrodes 124a and 124b in the (n + 1) th row and the (m + 1) th column. Different from the relationship with the potential.
- the gate signal voltage supplied to the gate bus line Lgn + 1 changes from the on-voltage to the off-voltage, whereby the TFTs 130a and 130b in the (n + 1) th row and the mth column and the (n + 1) th row and the (m + 1) th column change to the off state. Again, as described above, the pull-in phenomenon occurs.
- the storage capacitor signal voltage supplied to the CS bus lines Lcsa and Lcsb changes in different directions, and thereby the potentials of the sub-pixel electrodes 124a and 124b change in different directions.
- the initial change of the auxiliary capacitance signal voltage VLcsa after the TFT 130a is changed to the off state is a decrease, and the average potential of the sub-pixel electrode 124a is decreased.
- the initial change in the auxiliary capacitance signal voltage VLcsb after the TFT 130b changes to the off state is an increase, and the average potential of the sub-pixel electrode 124b increases.
- the luminance of the subpixel Spa in the pixel P in the (n + 1) th row and the mth column is higher than that of the subpixel Spb.
- the average potential of the subpixel electrode 124a also decreases according to the auxiliary capacitance signal voltage VLcsa, and the average potential of the subpixel electrode 124b is also reduced by the auxiliary capacitance. It increases according to the signal voltage VLcsb.
- the polarity of the pixel P in the (n + 1) th row and the (m + 1) th column is positive, the luminance of the subpixel Spb in the pixel P in the nth row and the (m + 1) th column is higher than that of the subpixel Spa.
- the polarity of the pixel P in the (n + 1) th row and the (m + 1) th column is reversed from the polarity of the pixel P in the (n + 1) th row and the mth column.
- the polarities of the pixels adjacent to each other in the row direction of the (n + 1) th row are similarly reversed.
- the subpixel Spa is a bright subpixel
- the subpixel Spb is a bright subpixel.
- the polarities of the pixels adjacent in the row direction and the column direction are different from each other, and the polarities of the pixels adjacent in the oblique direction are equal to each other.
- the polarities of the pixels in the n-th row and the m-th column and the (n + 1) -th row and the m + 1-th column are positive, and the polarities of the pixels in the (n + 1) -th row and the m-th column and the n-th row and the (m + 1) -th column are negative.
- Such driving is also called dot inversion driving.
- the subpixels adjacent to each other in the row direction and the column direction have different contrasts, and the bright subpixels are adjacent to each other in the oblique direction.
- the polarity of each pixel is inverted in the next vertical scanning period (field period or frame period), thereby suppressing display burn-in.
- auxiliary capacitance signal voltages VLcsa and VLcsb supplied to the auxiliary capacitance main lines Ltcsa and Ltcsb have been described with reference to FIG. 4, but the auxiliary capacitance signal voltages VLcsa and VLcsb are not limited thereto.
- the gate signal voltage VLg supplied to the gate bus line Lg changes from the on-voltage to the off-voltage, the first change of the auxiliary capacitance signal voltage VLcsa is an increase, and the first change of the auxiliary capacitance signal voltage VLcsb is reduced. It is preferable that Further, as described above, it is preferable that the polarity of each pixel is inverted in the next vertical scanning period.
- the auxiliary capacitance signal supplied to the CS bus line is an oscillating voltage including a rectangular wave with a duty ratio of 1: 1, but the present invention is not limited to this.
- a rectangular wave with a duty ratio other than 1: 1, or an oscillating voltage such as a sine wave or a triangular wave may be used.
- auxiliary capacity signals having different vibration periods 2H are supplied to the two auxiliary capacity trunk lines, but the present invention is not limited to this.
- the auxiliary capacity signals having different vibration periods 4H may be supplied to the four auxiliary capacity main lines.
- auxiliary capacity signals having different vibration periods NH may be supplied to N (N is an even number of 2 or more) auxiliary capacity trunk lines.
- a CS bus line is provided for each row of subpixels, but the present invention is not limited to this.
- the CS bus line may be provided so as to be shared by two rows of sub-pixels belonging to two adjacent rows of pixels.
- the liquid crystal display device 100A of the present embodiment has the same configuration as the liquid crystal display device 100 described above except that the connection relationship between the CS bus line and the sub-pixel is different, and redundant description is given to avoid redundancy. Omitted.
- the plurality of pixels P are arranged in a matrix of a plurality of rows and a plurality of columns.
- FIG. 5A is adjacent to the column direction in the liquid crystal display device 100A.
- An equivalent circuit diagram of two pixels P is shown.
- the source bus line in the m-th column is indicated as Lsm
- the gate bus lines in the n-th and n + 1-th rows are indicated as Lgn and Lgn + 1.
- the CS bus line Lcsb is electrically connected to the storage capacitor counter electrode EOb corresponding to the second sub-pixel Spb of the pixel P in the n-th row and the first of the pixels P in the n + 1-th row.
- the storage capacitor counter electrode EOa corresponding to the sub-pixel Spa is electrically connected.
- FIG. 5B is a schematic diagram of the liquid crystal display device 100A.
- the counter substrate 140 is omitted in order to avoid an excessively complicated drawing
- FIG. 5B corresponds to a top view of the active matrix substrate 120. .
- two TFTs 130a1 and 130a2 are provided corresponding to the sub-pixel Spa, and the TFTs 130a1 and 130a2 are arranged in series.
- two TFTs 130b1 and 130b2 are provided corresponding to the sub-pixel Spb, and the TFTs 130b1 and 130b2 are arranged in series.
- the gates of the TFTs 130a1 and 130a2 are electrically connected to the common gate line Lga, and the gates of the TFTs 130b1 and 130b2 are electrically connected to the common gate line Lgb.
- the on / off states of the TFTs 130a1, 130a2, 130b1, and 130b2 similarly change according to the gate signal voltages supplied to the gate wirings Lga and Lgb.
- the TFTs 130a1 and 130a2 are collectively referred to as the TFT 130a
- the TFTs 130b1 and 130b2 are collectively referred to as the TFT 130b.
- the CS bus line Lcs corresponds to the subpixels Spa and Spb of two pixels adjacent in the column direction.
- the CS bus line Lcsb corresponds to the storage capacitor counter electrode EOb corresponding to the second subpixel Spb of the pixel in the nth row and mth column and the first subpixel Spa of the pixel in the n + 1th row and mth column.
- the storage capacitor counter electrode EOa is electrically connected to both.
- one sub-pixel is shared by one CS bus line, and compared to the liquid crystal display device 100 shown in FIG.
- the CS bus line extending correspondingly between the subpixels to which it belongs can be omitted, and a high aperture ratio can be realized.
- the gate signal voltage supplied to the gate bus line Lgn in the nth row changes to the on voltage, whereby the TFTs 130a and 130b in the nth row and mth column are turned on.
- the source signal voltage supplied to the source bus line Lsm is applied to the subpixel electrodes 124a and 124b in the nth row and mth column.
- the supplied gate signal voltage changes from the on-voltage to the off-voltage, whereby the TFTs 130a and 130b in the n-th row and m-th column change to the off state. Note that, as described above, the potentials of the subpixel electrodes 124a and 124b are decreased due to the pulling phenomenon.
- the auxiliary capacitance signal voltage supplied to the CS bus lines Lcsa and Lcsb is changed in different directions, whereby the potentials of the subpixel electrodes 124a and 124b are changed. Changes in different directions.
- the auxiliary capacitance signal voltage supplied to the CS bus line Lcsa changes before the time when the gate signal voltage supplied to the gate bus line Lgn + 1 of the (n + 1) th row described later changes from the off voltage to the on voltage. It may be changed after the time.
- the auxiliary capacitance signal voltage supplied to the CS bus line Lcsb changes after the gate signal voltage supplied to the gate bus line Lgn + 1 in the (n + 1) th row described later changes from the off voltage to the on voltage.
- the first change in the auxiliary capacitance signal voltage supplied to the CS bus line Lcsa increases after the TFTs 130a and 130b change to the off state. If the initial change in the auxiliary capacitance signal voltage supplied to the CS bus line Lcsb is a decrease, the average potential of the subpixel electrode 124a increases, the average potential of the subpixel electrode 124b decreases, and the subpixel Spa Is higher than the sub-pixel Spb.
- the subpixel electrode 124a Conversely, if the initial change in the auxiliary capacitance signal voltage supplied to the CS bus line Lcsa is a decrease and the initial change in the auxiliary capacitance signal voltage supplied to the CS bus line Lcsb is an increase, the subpixel electrode 124a. , The average potential of the subpixel electrode 124b increases, and the luminance of the subpixel Spb becomes higher than that of the subpixel Spa.
- the first change in the auxiliary capacitance signal voltage supplied to the CS bus line Lcsa is increased after the TFTs 130a and 130b are turned off.
- the initial change in the auxiliary capacitance signal voltage supplied to the CS bus line Lcsb is a decrease, the average potential of the subpixel electrode 124a increases, the average potential of the subpixel electrode 124b decreases, and the luminance of the subpixel Spb Becomes higher than the sub-pixel Spa.
- the subpixel electrode 124a Conversely, if the initial change in the auxiliary capacitance signal voltage supplied to the CS bus line Lcsa is a decrease and the initial change in the auxiliary capacitance signal voltage supplied to the CS bus line Lcsb is an increase, the subpixel electrode 124a. , The average potential of the subpixel electrode 124b increases, and the luminance of the subpixel Spa becomes higher than that of the subpixel Spb.
- the gate signal voltage supplied to the gate bus line Lgn + 1 of the (n + 1) th row changes to the on voltage, and the TFTs 130a and 130b corresponding to the gate wirings Lga and Lgb change to the on state.
- the source signal voltage supplied to the source bus line Lsm is applied to the subpixel electrodes 124a and 124b in the (n + 1) th row and the mth column.
- the subpixel electrodes 124a and 124b in the nth row and the mth column have a higher potential than the potential of the counter electrode 144.
- a lower source signal voltage is applied.
- the gate signal voltage supplied to the gate bus line Lgn + 1 changes from the ON voltage to the OFF voltage, and thereby the TFTs 130a and 130b in the (n + 1) th row and the mth column change to the OFF state.
- the auxiliary capacitance signal voltage supplied to the CS bus lines Lcsb and Lcsc changes, and the potentials of the sub-pixel electrodes 124a and 124b change according to the change of the auxiliary capacitance signal voltage.
- the auxiliary capacitance signal voltage supplied to the CS bus line Lcsb changes before the time when the gate signal voltage supplied to the gate bus line Lgn + 2 of the (n + 2) th row not shown here changes from the off voltage to the on voltage. It may be changed after the time. However, the voltage supplied to the CS bus line Lcsc changes after the time when the gate signal voltage supplied to the gate bus line Lgn + 2 in the (n + 2) th row changes from the off voltage to the on voltage.
- FIG. 6 shows an equivalent circuit diagram of the liquid crystal display device 100A.
- FIG. 6 shows an equivalent circuit of a plurality of pixels P.
- the source bus lines corresponding to the pixels in the m-th column to the (m + 2) th column are indicated as Lsm to Lsm + 2
- the gate bus lines corresponding to the pixels in the n-th row to the n + 6th row are indicated as Lgn to Lgn + 6.
- the CS bus lines extending from the auxiliary capacity trunk lines Ltcsa to Ltcsd are indicated as CS bus lines Lcsa to Lcsd, respectively.
- the CS bus lines Lcsa to Lcsd correspond to two subpixels Spa and Spb of the pixel P adjacent in the column direction, respectively.
- FIG. 7 shows a voltage waveform diagram of the liquid crystal display device 100A.
- VLsm indicates a voltage waveform of a source signal supplied to the source bus line Lsm with reference to the voltage of the counter electrode 144 indicated by a broken line
- VLgn to VLgn + 6 are supplied to the gate bus lines Lgn to Lgn + 6.
- VLcsa to VLcsd indicate the voltage waveforms of the auxiliary capacitance signals supplied to the CS bus lines Lcsa to Lcsd.
- VCLa m, n to VCLa m and n + 6 respectively indicate the potential of the sub-pixel electrode 124a of the pixel P in the n-th row and m-th column to the (n + 6) -th row and the m-th column with reference to the potential of the counter electrode 144
- VCLb m, n to VCLb m and n + 6 respectively indicate the potentials of the sub-pixel electrodes 124b of the pixels P in the nth row and mth column to the n + 6th row and mth column with reference to the potential of the counter electrode 144.
- an input signal for making all the pixels have the same gradation level is input.
- each of the auxiliary capacitance signal voltages VLcsa to VLcsd supplied to the auxiliary capacitance trunk lines Ltcsa to Ltcsd is an oscillation voltage including a rectangular wave with a duty ratio of 1: 1, and the oscillation cycle is 8 in the horizontal scanning period. Double time (8H).
- the phase of the auxiliary capacitance signal voltage VLcsb is delayed by 4H compared to the auxiliary capacitance signal voltage VLcsa.
- the phase of the auxiliary capacitance signal voltage VLcsd is delayed by 4 H compared with the auxiliary capacitance signal voltage VLcsc. Focusing on the auxiliary capacitance signal voltages VLcsa and VLcsc, the phase of the auxiliary capacitance signal voltage VLcsc is delayed by 2H compared to the auxiliary capacitance signal voltage VLcsa.
- writing to the pixel P in the liquid crystal display device 100A will be described with reference to FIG. 6 and FIG.
- writing to the pixels P in the nth row will be described.
- the pixel P in the n-th row and the m-th column and the n-th row and the (m + 1) -th column is focused on.
- the gate signal voltage supplied to the n-th row gate wirings Lga and Lgb changes from the off-voltage to the on-voltage, thereby turning on the TFTs 130a and 130b in the n-th row and m-th column and the n-th row and m + 1-th column.
- the source signal voltage supplied to the source bus line Lsm is applied to the subpixel electrodes 124a and 124b in the nth row and mth column and supplied to the source bus line Lsm + 1.
- the source signal voltage thus applied is applied to the sub-pixel electrodes 124a and 124b in the nth row and the (m + 1) th column.
- the source signal voltage supplied to the source bus line Lsm is higher than that of the counter electrode 144. Although not shown here, the source signal voltage supplied to the source bus line Lsm + 1 is lower than that of the counter electrode 144. Thus, the polarities of the pixels P adjacent in the row direction are different from each other.
- the gate signal voltage supplied to the gate wirings Lga and Lgb changes from the on voltage to the off voltage, whereby the TFTs 130a and 130b in the nth row, the mth column, and the nth row, the m + 1th column change to the off state. .
- the potentials of the sub-pixel electrodes 124a and 124b decrease substantially the same due to a pull-in phenomenon based on the influence of the parasitic capacitances and the like of the TFTs 130a and 130b.
- the auxiliary capacitance signal voltages VLcsa and VLcsb supplied to the CS bus lines Lcsa and Lcsb change in different directions, whereby the potentials of the sub-pixel electrodes 124a and 124b change in different directions. Change.
- the auxiliary capacitance signal voltages VLcsa and VLcsb change after the gate signal voltage VLgn + 1 of the gate bus line Lgn + 1 described later changes from the on voltage to the off voltage.
- the first change of the auxiliary capacitance signal voltage VLcsa after the TFTs 130a and 130b change to the off state is an increase, and the first change of the auxiliary capacitance signal voltage VLcsa is a decrease.
- the average potential of the subpixel electrode 124a increases and the average potential of the subpixel electrode 124b decreases. Since the polarity of the pixel P in the n-th row and the m-th column is positive, the luminance of the sub-pixel Spa in the pixel P in the n-th row and the m-th column is higher than that of the sub-pixel Spb.
- the average potential of the subpixel electrode 124a also increases in accordance with the auxiliary capacitance signal voltage VLcsa in the pixel P in the nth row and the (m + 1) th column, and the average potential of the subpixel electrode 124b is also increased by the auxiliary capacitance. It decreases according to the signal voltage VLcsb.
- the polarity of the pixel P in the nth row and the (m + 1) th column is negative, the luminance of the subpixel Spb in the pixel P in the nth row and the (m + 1) th column is higher than that of the subpixel Spa.
- the polarity of the pixel P in the nth row and the m + 1th column is inverted from the polarity of the pixel P in the nth row and the mth column.
- the polarities of pixels adjacent in the row direction of the nth row are similarly reversed.
- the subpixel Spa is a bright subpixel
- the subpixel Spb is a bright subpixel.
- the gate signal voltage supplied to the gate wirings Lga and Lgb in the (n + 1) th row changes from the off voltage to the on voltage, whereby the TFTs 130a and 130b in the (n + 1) th row and the mth column and the (n + 1) th row and the (m + 1) th row are turned on. Become.
- the source signal voltage supplied to the source bus line Lsm is applied to the subpixel electrodes 124a and 124b in the (n + 1) th row and the mth column and supplied to the source bus line Lsm + 1.
- the source signal voltage thus applied is applied to the subpixel electrodes 124a and 124b of the (n + 1) th row and the (m + 1) th column.
- the polarity of the pixel P in the (n + 1) th row and the mth column is different from the polarity of the pixel P in the (n + 1) th row and the m + 1th column.
- the polarity of the pixel P in the (n + 1) th row and the mth column is different from the polarity of the pixel P in the nth row and the mth column, and the polarity of the pixel P in the (n + 1) th row and the (m + 1) th column is the pixel P in the nth row and the (m + 1) th column.
- the polarity is different.
- the gate signal voltage supplied to the gate bus line Lgn + 1 changes from the on voltage to the off voltage, and thereby the TFTs 130a and 130b in the (n + 1) th row and the mth column and the (n + 1) th row and the (m + 1) th column change to the off state.
- the auxiliary capacitance signal voltages VLcsb and VLcsc supplied to the CS bus lines Lcsb and Lcsc change in different directions.
- the auxiliary capacitance signal voltage VLcsc changes after the gate signal voltage VLgn + 3 of the gate bus line Lgn + 3 changes from the on voltage to the off voltage, although not described in detail here.
- the first change of the auxiliary capacitance signal voltage VLcsb after the TFTs 130a and 130b are turned off is a decrease, and the first change of the auxiliary capacitance signal voltage VLcsc is an increase.
- the average potential of the subpixel electrode 124a decreases and the average potential of the subpixel electrode 124b increases. Since the polarity of the pixel P in the (n + 1) th row and the mth column is negative, the luminance of the subpixel Spa in the pixel P in the (n + 1) th row and the mth column is higher than that of the subpixel Spb.
- the average potential of the subpixel electrode 124a also decreases according to the auxiliary capacitance signal voltage VLcsb, and the average potential of the subpixel electrode 124b is also reduced by the auxiliary capacitance. It increases according to the signal voltage VLcsc.
- the luminance of the subpixel Spb in the pixel P in the (n + 1) th row and the (m + 1) th column is higher than that of the subpixel Spa.
- writing to the pixels P in the (n + 1) th row is performed.
- the polarities of the pixels adjacent to each other in the row direction of the (n + 1) th row are inverted from each other, and the light / dark relations of the sub-pixels of the pixels adjacent to each other in the row direction of the (n + 1) th row are inverted from each other.
- Writing to the pixels P in the (n + 2) th and subsequent rows is performed in the same manner.
- the polarities of the pixels adjacent in the row direction and the column direction are different from each other, and the polarities of the pixels adjacent in the oblique direction are equal to each other.
- the polarities of the pixels in the n-th row and the m-th column and the (n + 1) -th row and the m + 1-th column are positive, and the polarities of the pixels in the (n + 1) -th row and the m-th column and the n-th row and the (m + 1) -th column are negative.
- the subpixels adjacent to each other in the row direction and the column direction have different contrasts, and the bright subpixels are adjacent to each other in the oblique direction.
- the polarity of each pixel is inverted in the next vertical scanning period (field period or frame period), thereby suppressing display burn-in.
- the auxiliary capacitance signal supplied to the CS bus line is an oscillating voltage including a rectangular wave with a duty ratio of 1: 1, but the present invention is not limited to this.
- a rectangular wave with a duty ratio other than 1: 1, or an oscillating voltage such as a sine wave or a triangular wave may be used.
- auxiliary capacity signals having different vibration periods 8H are supplied to the four auxiliary capacity trunk lines, but the present invention is not limited to this.
- Auxiliary capacitance signals having different vibration periods 12H may be supplied to the six auxiliary capacitance trunk lines.
- auxiliary capacitance signals having different oscillation periods (2 ⁇ N) ⁇ K ⁇ H K is a positive integer
- N N is an even number of 2 or more
- auxiliary capacity signals having different vibration periods 1H may be supplied to the two auxiliary capacity trunk lines.
- the liquid crystal display devices 100 and 100A may be in a so-called MVA mode.
- the MVA mode liquid crystal display device has a linear slit formed on the electrode and a linear dielectric protrusion (rib) formed on the liquid crystal layer side of the electrode on a pair of substrates opposed via the liquid crystal layer.
- the directors of the liquid crystal domain formed at the time of voltage application are regulated by arranging them in parallel and alternately.
- the direction of the liquid crystal domain is a direction orthogonal to the direction in which the linear slits or dielectric protrusions (collectively referred to as “linear structures”) extend.
- the gate wirings Lga and Lgb may be arranged so as to overlap with boundaries between different liquid crystal domains.
- the liquid crystal display devices 100 and 100A may be in the PSA mode.
- PSA technology Polymer Sustained Alignment Technology (hereinafter referred to as “PSA technology”) is disclosed in, for example, JP 2002-357830 A, JP 2003-177418 A, JP 2006-78968 A, K.A. Hanaoka et al. "A New MVA-LCD by Polymer Sustained Alignment Technology", SID 04 DIGEST 1200-1203 (2004). The entire disclosure of these four documents is hereby incorporated by reference.
- a small amount of a polymerizable compound for example, a photopolymerizable monomer or oligomer
- a liquid crystal panel is assembled, and a predetermined voltage is applied to the liquid crystal layer.
- This is a technique for controlling the pretilt direction of liquid crystal molecules by irradiating active energy rays (for example, ultraviolet rays) to form a polymer.
- active energy rays for example, ultraviolet rays
- the alignment state of the liquid crystal molecules when the polymer is generated is maintained (stored) even after the voltage is removed (a state where no voltage is applied).
- a layer formed of a polymer is referred to as an orientation maintaining layer.
- the alignment maintaining layer is formed on the surface of the alignment film (on the liquid crystal layer side), but does not necessarily have a shape covering the surface of the alignment film, and may be discrete polymer particles.
- the PSA technique can adjust the pretilt azimuth and pretilt angle of liquid crystal molecules by controlling the electric field formed in the liquid crystal layer.
- the alignment maintaining layer exhibits an alignment regulating force on almost all surfaces in contact with the liquid crystal layer, the response characteristics are excellent.
- each of the subpixel electrodes 124a and 124b includes a cross-shaped trunk portion that is disposed so as to overlap the polarization axis of the pair of polarizing plates, and a plurality of branches that extend in a direction of approximately 45 ° from the cross-shaped trunk portion.
- the branch portion extends from the trunk portion in 45 °, 135 °, 225 °, and 315 ° orientations, and the liquid crystal molecules (negative dielectric anisotropy) of the vertically aligned liquid crystal layer are separated from the trunk portion and the branch portion. Is inclined in the direction in which each branch extends.
- the oblique electric field from the branches extending in parallel to each other acts to incline the liquid crystal molecules in the direction perpendicular to the direction in which the branches extend, and the oblique electric field from the trunk portion causes the liquid crystal molecules in the direction in which each branch extends. This is because it acts so as to be inclined.
- the gate wirings Lga and Lgb may be arranged so as to overlap with boundaries between different liquid crystal domains.
- a vertical alignment liquid crystal display device may be provided with a photo-alignment film as the alignment film.
- a photo-alignment film having different regions subjected to alignment processing in anti-parallel in the sub-pixels is provided on both the active matrix substrate 120 and the counter substrate 140, and the pair of alignment films is provided in each region facing each other.
- the alignment treatment directions are arranged so as to be orthogonal.
- the liquid crystal molecules in the vicinity of the photo-alignment film are slightly inclined with respect to the normal direction of the main surface of the photo-alignment film.
- the photo-alignment film may be provided only on one of the counter substrate 120 and the active matrix substrate 140. Further, even in a liquid crystal display device using a photo-alignment film, the gate lines Lga and Lgb may be arranged so as to overlap with boundaries between different liquid crystal domains.
- the liquid crystal display devices 100 and 100A may be in the CPA mode.
- the subpixel electrodes 124 a and 124 b may have a highly symmetric shape, and the liquid crystal molecules of each liquid crystal domain may be in an axially symmetric tilted orientation by applying a voltage to the liquid crystal layer 160.
- the liquid crystal display device is a vertical alignment type, but the present invention is not limited to this.
- the liquid crystal display device may be in other modes.
- each pixel is rectangular, but the present invention is not limited to this.
- the pixel may have another shape.
- the liquid crystal display device according to the present invention can suppress variations in parasitic capacitance caused by misalignment between the gate bus line and the subpixel electrode. Further, the liquid crystal display device according to the present invention can improve the viewing angle characteristics without increasing the power consumption.
- Liquid crystal display device 120 Active matrix substrate 124 Pixel electrode 130 TFT 140 Counter substrate 144 Counter electrode 160 Liquid crystal layer
Abstract
Description
120 アクティブマトリクス基板
124 画素電極
130 TFT
140 対向基板
144 対向電極
160 液晶層
Claims (7)
- アクティブマトリクス基板と、対向基板と、前記アクティブマトリクス基板と前記対向基板との間に設けられた液晶層とを備える液晶表示装置であって、
前記アクティブマトリクス基板は、
それぞれが複数の画素のそれぞれを規定する複数の画素電極であって、第1副画素電極および第2副画素電極を有する画素電極を含む複数の画素電極と、
それぞれがゲート、ソース、および、ドレインを有する複数の薄膜トランジスタであって、第1薄膜トランジスタおよび第2薄膜トランジスタを含む複数の薄膜トランジスタと、
前記第1薄膜トランジスタの前記ドレインおよび前記第1副画素電極に電気的に接続された第1補助容量電極、および、前記第2薄膜トランジスタの前記ドレインおよび前記第2副画素電極に電気的に接続された第2補助容量電極を含む複数の補助容量電極と、
前記第1補助容量電極と補助容量を形成する第1補助容量対向電極と電気的に接続された第1補助容量バスライン、および、前記第2補助容量電極と補助容量を形成する第2補助容量対向電極と電気的に接続された第2補助容量バスラインを含む複数の補助容量バスラインと、
前記第1薄膜トランジスタの前記ソースおよび前記第2薄膜トランジスタの前記ソースに電気的に接続されたソースバスラインと、
前記第1薄膜トランジスタの前記ゲートと電気的に接続された第1ゲート配線と、前記第2薄膜トランジスタの前記ゲートと電気的に接続された第2ゲート配線と、前記第1ゲート配線と前記第2ゲート配線とを電気的に接続する接続配線とを含む、ゲートバスラインと
を有しており、
前記第1副画素電極は前記第1ゲート配線を跨いでおり、前記第2副画素電極は前記第2ゲート配線を跨いでいる、液晶表示装置。 - 前記液晶表示装置は、前記複数の画素の設けられた表示領域と、前記接続配線の設けられた周辺領域とを有する、請求項1に記載の液晶表示装置。
- 前記複数の画素電極は行方向および列方向にマトリクス状に配列されており、
前記第1ゲート配線および前記第2ゲート配線は前記行方向に沿って延びる、請求項1または2に記載の液晶表示装置。 - 前記第1ゲート配線と前記第1副画素電極との重なり面積は、前記第2ゲート配線と前記第2副画素電極との重なり面積と略等しい、請求項1から3のいずれかに記載の液晶表示装置。
- 前記第1副画素電極の中心と前記第2副画素電極の中心との距離、前記第1ゲート配線の中心線と前記第2ゲート配線の中心線との距離、および、前記第1補助容量バスラインの中心線と前記第2補助容量バスラインの中心線との距離は互いに略等しい、請求項1から4のいずれかに記載の液晶表示装置。
- 前記第1補助容量バスラインには第1補助容量信号が供給され、
前記第2補助容量バスラインには前記第1補助容量信号とは異なる第2補助容量信号が供給される、請求項1から5のいずれかに記載の液晶表示装置。 - 前記液晶層は垂直配向型である、請求項1から6のいずれかに記載の液晶表示装置。
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CN104090406B (zh) * | 2014-07-17 | 2016-02-03 | 深圳市华星光电技术有限公司 | 显示面板及其彩色滤光片基板 |
CN104597647B (zh) * | 2015-01-21 | 2017-11-28 | 深圳市华星光电技术有限公司 | 一种液晶显示面板及其制作方法 |
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JP4372648B2 (ja) | 2004-09-13 | 2009-11-25 | シャープ株式会社 | 液晶表示装置およびその製造方法 |
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JP4994366B2 (ja) * | 2006-03-17 | 2012-08-08 | シャープ株式会社 | 液晶表示装置 |
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US8902373B2 (en) | 2014-12-02 |
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