JP2006003623A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve display quality by preventing luminance of an end pixel from being heightened. <P>SOLUTION: A distance L' between a left end signal line X and the adjacent signal line X is made to be shorter than a width W of a pixel electrode 15. That is, the opening ratio of the left end pixel is made to be less than that of a pixel not on the left end. Thereby more light quantity is shielded on the end pixel, and as a result, the luminance at the end pixel is prevented from being heightened. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a liquid crystal display device that improves display quality by preventing an increase in luminance of an end pixel.

  As an active matrix type liquid crystal display device using a thin film transistor, for example, there is one disclosed in Patent Document 1. The liquid crystal display device is formed so that a plurality of signal lines and scanning lines intersect, and an array substrate on which pixel switches and pixel electrodes are formed at each intersection, and the array substrate is opposed to each other with a liquid crystal layer interposed therebetween, And a counter substrate on which a counter electrode for applying a voltage to the pixel electrode is formed.

  Further, in this liquid crystal display device, three pixel groups in the horizontal scanning direction, that is, pixel groups corresponding to the respective colors of red (R), green (G), and blue (B) are configured. The liquid crystal display device also includes a scanning line driving circuit that sequentially drives each scanning line, and a signal line driving circuit that writes a video signal to a pixel electrode connected to the same scanning line via a pixel switch. Yes. Then, the signal line driving circuit performs, for example, so-called three-selection driving, for example, first writing the video signal to the red pixel group, then writing the video signal to the green pixel group, and finally writing the video signal to the blue pixel group. The signal line is driven to write.

  In addition, in this liquid crystal display device, in order to prevent liquid crystal burn-in, alternating current driving that reverses the polarity of the liquid crystal applied voltage (the voltage between the pixel electrode and the counter electrode) between the preceding frame and the subsequent frame is performed. Done.

As the AC driving method, the polarity of the liquid crystal applied voltage in the same frame is the same in the pixel group arranged in the vertical scanning direction, or the polarity is the same in the pixel group arranged in the horizontal scanning direction. An H line inversion driving method is used, or an HV inversion driving method in which the polarities of adjacent pixels in the vertical scanning direction are different from each other and the polarities of adjacent pixels in the horizontal scanning direction are different from each other is adopted. In particular, as the H line inversion driving method, a method of driving the counter electrode with a direct current and a so-called H common inversion driving method of driving the counter electrode with an alternating current are known.
JP 2003-215540 A

  In the above liquid crystal display device, for example, when a video signal is written later to a pixel group corresponding to a green or blue color, the red pixel electrode may rise. Specifically, when the red pixel group includes an end pixel and a non-end pixel in the horizontal scanning direction, the pixel voltage between the end pixel and the end pixel is different depending on the arrangement. As a result, there is a difference in light transmittance between the end pixels and the non-end pixels. For this reason, the end pixels may appear unnaturally bright. In some cases, it may be recognized as a bright line, which is one of the defective phenomena.

  Accordingly, 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 in which display quality is improved by preventing an increase in luminance of end pixels. There is to do.

  In order to solve the above problem, a liquid crystal display device according to claim 1 is formed such that a plurality of parallel signal lines and a plurality of parallel scanning lines intersect, and a pixel is arranged at each intersection. A panel, scanning line driving means for sequentially driving each scanning line, and writing an image signal to each pixel arranged at the intersection of the same driven scanning line and each signal line. Video signal writing means for writing a video signal to a pixel group including pixels first and then writing a video signal to another pixel group later, the aperture ratio of the pixel at the end is set to be higher than the aperture ratio of the pixel at the end It is also characterized by lowering.

  According to the liquid crystal display device of the first aspect, since the aperture ratio of the pixel at the end is lower than the aperture ratio of the pixel at the end, more light is shielded at the end pixel, so that it corresponds to other colors. When a video signal is written to the pixel group later, the transmittance of light between the end pixel and the end pixel is caused by a difference in the liquid crystal applied voltage between the end pixel and the end pixel. The difference can be reduced, so that the luminance of the pixel at the end can be prevented from being increased and the display quality can be improved.

  A liquid crystal display device according to a second aspect is the liquid crystal display device according to the first aspect, characterized in that a signal line corresponding to the pixel at the end is thickened.

  According to the liquid crystal display device of the second aspect, by increasing the signal line corresponding to the end pixel, the aperture ratio of the end pixel is lowered, thereby preventing the brightness of the end pixel from being increased. Display quality can be improved.

  A liquid crystal display device according to a third aspect is the liquid crystal display device according to the first or second aspect, wherein a signal line adjacent to the signal line corresponding to the pixel at the end is thickened.

  According to the liquid crystal display device of claim 3, by increasing the signal line adjacent to the signal line corresponding to the end pixel, the end pixel has a low aperture ratio, thereby increasing the brightness of the end pixel. It is possible to improve display quality.

  A liquid crystal display device according to a fourth aspect is the liquid crystal display device according to any one of the first to third aspects, wherein a light-shielding pattern having a light-shielding property is included in the opening of the pixel at the end.

  According to the liquid crystal display device of the fourth aspect, by including the light shielding pattern having the light shielding property in the opening of the end pixel, the aperture ratio of the end pixel is lowered, and thereby the luminance of the end pixel is increased. The display quality can be improved by preventing the increase.

  The liquid crystal display device according to claim 5 is the liquid crystal display device according to any one of claims 1 to 4, wherein the light shielding pattern is configured in at least one of layers constituting the pixel switch. .

  According to the liquid crystal display device of the fifth aspect, since the light shielding pattern is formed in at least one of the layers constituting the pixel switch, the aperture ratio of the end pixel is lowered, thereby increasing the brightness of the end pixel. It is possible to improve display quality.

  A liquid crystal display device according to a sixth aspect is the liquid crystal display device according to any one of the first to fifth aspects, wherein the light shielding pattern is formed on the counter substrate.

  According to the liquid crystal display device of the sixth aspect, since the light shielding pattern is formed on the counter substrate, the aperture ratio of the pixel at the end is lowered, thereby preventing the luminance of the pixel at the end from being increased. Quality can be improved.

  According to the liquid crystal display device of the present invention, since the aperture ratio of the end pixel is lower than the aperture ratio of the pixel that is not at the end, more light is shielded at the end pixel, so that the pixel groups corresponding to other colors When a video signal is written later, the difference in light transmittance between the end pixel and the end pixel is caused by the difference in the liquid crystal applied voltage between the end pixel and the end pixel. Therefore, the display quality can be improved by preventing the luminance of the pixel at the end from increasing.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram schematically showing a configuration of a liquid crystal display device 1 according to an embodiment of the present invention.

  The liquid crystal display device 1 includes an array substrate 11 and a counter substrate 12 disposed above the array substrate 11 with a predetermined interval therebetween. The array substrate 11 and the counter substrate 12 are surrounded by a sealing material 13. A liquid crystal layer (not shown) is formed by sealing the liquid crystal material injected and sealed from the injection port provided in the sealing material 13. The array substrate 11, the counter substrate 12, and the liquid crystal layer constitute a liquid crystal panel 100. In addition, the liquid crystal display device 1 includes a backlight device (not shown) on the back surface of the array substrate 11.

  A plurality of scanning lines Y extending in parallel along the horizontal scanning direction (left-right direction in FIG. 1) and a plurality of scanning lines Y extending in parallel along the vertical scanning direction (up-down direction in FIG. 1) are arranged on the array substrate 11. A thin film transistor (polycrystalline silicon TFT having a polycrystalline silicon film as a semiconductor layer) as a pixel switch provided at each intersection where a plurality of signal lines X intersect with each scanning line Y and each signal line X. (Hereinafter referred to as pixel TFT) 14 and a transparent pixel electrode 15 connected to the pixel TFT 14 are formed. The pixel electrode 15 is one of the constituent elements of the pixel, and a pixel is constituted by the pixel electrode 15, a liquid crystal layer, a counter electrode described later, and the like.

  The pixel electrode 15 constitutes a liquid crystal capacitive element 16a on the array substrate 11 and constitutes a liquid crystal capacitive element 16b with the counter substrate 12, and the pixel voltage is held by these liquid crystal capacitive elements 16a and 16b.

  The number of signal lines X is, for example, 240 for each color of R (red), G (green), and B (blue), and the number of scanning lines Y is 320, for a total of about 230,000 pixels of the liquid crystal display device 1 ( QVGA (Quarter Video Graphics Array) liquid crystal display device) can be configured.

  FIG. 2 is a circuit diagram of each pixel arranged in the horizontal scanning direction. Specifically, the left end is the red pixel R1, and the pixels are configured in the order of the green pixel G1, the blue pixel B1, the red pixel R2, the green pixel G2,. ing.

  In the liquid crystal display device 1, pixels are written in the order of red (R), green (G), and blue (B), but writing may be performed in a different order.

  A gate electrode of each pixel TFT 14 is connected to the scanning line Y. Each signal line X is connected to the source electrode of the corresponding pixel TFT 14. The drain electrode of each pixel TFT 14 is connected to the corresponding pixel electrode 15. Each pixel electrode 15 constitutes a liquid crystal capacitive element 16 a in the array substrate 11 and a liquid crystal capacitive element 16 b between the counter electrode 12 and the pixel electrode 15.

  Further, a coupling capacitor C is formed between each signal line X and the pixel electrode 15 located adjacent thereto. For example, a series circuit of three coupling capacitors C is configured between the signal line X for writing a video signal to the pixel B1 and the pixel electrode 15 of the pixel R2. For simplification, writing a video signal to the pixel electrode is expressed as writing a video signal to the pixel as appropriate.

Returning to FIG. 1, the scanning line driving circuit 17 for driving the scanning line Y is integrally formed on the array substrate 11 by the same manufacturing process as the pixel TFT 14.
An FPC (Flexible Printed Circuit) 2 is connected to the array substrate 11, and an external drive circuit 21 that supplies a scan line drive circuit control signal 17 S to the scan line drive circuit 17 is mounted on the FPC 2.

  The external drive circuit 21 supplies a digital video signal SIGd to the signal line drive circuit 18 formed integrally on the array substrate 11.

  The signal line drive circuit 18 converts the digital video signal SIGd from the external drive circuit 21 into an analog video signal SIGa.

  On the array substrate 11, a signal line switching circuit 19 for supplying the video signal SIGa converted by the signal line driving circuit 18 to the signal line X and switching the signal line X of the supply destination is integrally formed.

  The external drive circuit 21 supplies the signal line switching circuit 19 with three write signals for pixel writing, that is, a red write signal WR (R), a green write signal WR (G), and a blue write signal. A signal WR (B) is supplied.

  FIG. 3 is a diagram for explaining the configuration of the signal line switching circuit 19.

  In the liquid crystal display device 1, a plurality of video signals SIGa are used for each color of red (R), green (G), and blue (B), and FIG. 3 shows a unit circuit corresponding to each video signal SIGa. .

  This unit circuit sequentially supplies the corresponding video signal SIGa to the signal line X connected to each of the red (R), green (G), and blue (B) pixel TFTs 14, that is, performs three selection driving. It is. The unit circuit includes three changeover switches 191 each composed of a transistor similar to that of the pixel TFT 14 for each signal line X, that is, a total of three. The one video signal SIGa is supplied to the source electrode of each changeover switch 191. The drain electrode of each changeover switch 191 is connected to the corresponding signal line X. In the unit circuit, switching is performed by sequentially driving the gate electrode of each changeover switch 191 by the red write signal WR (R), the green write signal WR (G), and the blue write signal WR (B). The switches 191 are sequentially turned on. Thus, the video signal SIGa is sequentially supplied to the signal line X and written to the pixels.

  FIG. 4 is a diagram illustrating a cross section of a portion provided with a liquid crystal layer in the liquid crystal display device 1.

  On the glass substrate 111 constituting the array substrate 11, the signal lines X and the scanning lines Y, the pixel TFTs 14 connected to these wirings, and the auxiliary capacitance lines 112 are formed. In the pixel TFT 14, the gate electrode of the pixel TFT 14 is connected to the scanning line Y, and the source electrode is connected to the signal line X.

  The signal line X, the scanning line Y, the pixel TFT 14 and the auxiliary capacitance line 112 are covered with an organic insulating film 113. The drain electrode of the pixel TFT 14 is electrically connected to the pixel electrode 15 through the electrode wiring 114 and the through hole of the organic insulating film 113.

  In addition, an alignment film 115 is formed so as to cover the pixel electrode 15, and the surface thereof is rubbed (polished).

  On the other hand, on the glass substrate 121 constituting the counter substrate 12, a filter layer 122 including a color filter portion 1221 facing each pixel electrode 15 and a lattice-shaped light shielding portion 1222 that separates the color filter portions 1221 is formed. The

  In the color filter unit 1221, the pixel corresponding to the leftmost pixel is R (red), the pixel corresponding to each pixel on the right is G (green), and the pixel corresponding to each pixel on the right is B ( It is configured to repeat this structure in the right direction thereafter.

  On the filter layer 122, a transparent counter electrode 123 that is common to all the pixel electrodes 15 and is transparent is formed. The counter electrode 123 is covered with an alignment film 124, and the alignment film 124 is rubbed. The counter electrode 123 is opposed to all the pixel electrodes 15 through the alignment film 124, the liquid crystal layer 130, and the alignment film 115.

  FIG. 5 is a plan view of the pixel R2 and its periphery when viewed from the liquid crystal layer 130 in the direction of the array substrate 11. FIG.

  The pixel TFT 14 constituting the pixel R2 has a source electrode connected to the corresponding signal line X and a gate electrode connected to the scanning line Y. The drain electrode of the pixel TFT 14 is connected to the pixel electrode 15 via the electrode wiring 114. The pixel electrode 15 and the auxiliary capacitance line 112 constitute the liquid crystal capacitance element 16a shown in FIG.

  The width W of the pixel electrode 15 is the same as the width of the other pixel electrodes 15.

  The distance L between the signal line X corresponding to the pixel R2 and the adjacent signal line X is substantially equal to the width W of the pixel electrode 15. The distance L between the signal lines is the leftmost signal line. Except for the interval between X and the adjacent signal line, it is common.

  FIG. 6 is a plan view of the pixel R1 and its periphery when viewed from the liquid crystal layer 130 in the direction of the array substrate 11.

  In comparison with FIG. 5, the distance L ′ between the leftmost signal line X and the adjacent signal line X is shorter than the width W of the pixel electrode 15. In other words, the aperture ratio of the pixel at the left end is lower than the aperture ratio of the pixel not at the left end. In FIG. 6, the width of the signal line X at the left end is increased, but the width of the adjacent signal line X may be increased as shown in FIG.

  Further, as shown in FIG. 8, a light shielding pattern 140 may be provided in the opening of the leftmost pixel. The light shielding pattern can be provided on the array substrate 11. Specifically, at least one layer constituting the pixel TFT can be provided. Further, the light shielding pattern can be provided on the counter substrate 12, specifically, the color filter portion 1221 of FIG. 4.

  In the liquid crystal display device 1, the aperture ratio can be adjusted by combining one or more of increasing the width of the signal line X at the left end, increasing the width of the adjacent signal line X, and providing a light shielding pattern. You can do it more freely.

  Next, the operation of the liquid crystal display device 1 will be described.

  In the liquid crystal display device 1, when the external driving circuit 21 supplies the scanning line driving circuit control signal 17 </ b> S to the scanning line driving circuit 17, the scanning line driving circuit 17 sequentially drives each scanning line Y. On the other hand, when the external drive circuit 21 supplies the video signal SIGd to the signal line drive circuit 18, the signal line drive circuit 18 A / D converts the video signal SIGd into the video signal SIGa and supplies the video signal SIGd to the signal line drive circuit 18. The signal line drive circuit 18 supplies the video signal SIGa to each signal line X and switches the signal line X to be supplied.

  When the same scanning line Y is driven, each pixel TFT 14 connected to the scanning line Y becomes conductive, and a video signal is written to the pixel through the pixel TFT 14. At this time, a liquid crystal applied voltage is generated between the pixel electrode 15 and the counter electrode 123, thereby generating an electric field in the liquid crystal layer 130. Further, by adjusting the voltage of the liquid crystal applied voltage, the amount of light transmitted from the backlight device is adjusted, whereby an image is displayed.

  FIG. 9 shows the voltage of the signal VCOM applied to the counter electrode 123, the voltage of the write signal WR (R), the voltage of the pixel electrode 15 of the pixel R1 (pixel voltage) VR1, and the voltage of the pixel electrode of the pixel R2 (pixel voltage). ) VR2. These voltage waveforms are obtained when the liquid crystal application voltage is controlled to be constant in order to perform uniform intermediate luminance display on the entire screen, that is, intermediate raster display.

  In the liquid crystal display device 1, the polarity of the signal VCOM is inverted every horizontal scanning period. That is, common inversion driving is performed. Further, in each horizontal scanning period, the corresponding scanning line Y is driven, and the video signal SIGa is written to the pixel arranged at the intersection of the scanning line Y and each signal line X.

  If each pixel shown in FIG. 2 is written with a video signal in the n-th horizontal scanning period, for example, in the pixel R1 and the pixel R2, the pixel voltage VR1 and the pixel voltage VR2 are determined by writing in the previous frame, and each pixel voltage VR1. , VR2 and the voltage applied to the liquid crystal corresponding to the difference between the voltage of the signal VCOM are maintained until the (n-1) th horizontal scanning period.

  In the n-th horizontal scanning period, the video signal SIGa is changed to a red (R) pixel group, that is, the pixels R1, R2, by controlling the write signal WR (R), which is normally a low voltage, to a high voltage. Write to…. Thereby, the pixel voltages VR1 and VR2 become equal to the voltage of the video signal SIGa.

  Next, the video signal SIGa is written to the green (G) pixel group, that is, the pixels G1, G2,... By similarly controlling the write signal WR (G) (not shown) to a high voltage.

  Next, the video signal SIGa is written into the blue (B) pixel group, that is, the pixels B1, B2,... By controlling the write signal WR (B) (not shown) to a high voltage. At this time, as shown in FIG. 2, the pixel voltage VR2 rises due to the series circuit of the three coupling capacitors C interposed between the signal line X corresponding to the pixel B1 and the pixel electrode 15 of the pixel R2. After the increase, the voltage difference ΔVR from the pixel voltage VR1 becomes several mV.

  Then, the liquid crystal capacitive elements 16a and 16b cause the liquid crystal applied voltages corresponding to the difference between the pixel voltages VR1 and VR2 and the voltage of the signal VCOM to be the (n + 1) th horizontal scanning period, the (n + 2) th horizontal scanning period, and the like. After that, it is maintained until writing of the next frame.

  In the writing of the next frame, the pixel voltage VR2 once becomes equal to the voltage of the video signal SIGa, that is, equal to the pixel voltage VR1, but again rises above the pixel voltage VR1 due to coupling. Therefore, the pixel voltage VR2 is several mV higher than the pixel voltage VR1 in most periods.

  FIG. 10 is a diagram showing a change in light transmittance in the liquid crystal when the liquid crystal applied voltage is changed.

  In the liquid crystal display device 1, the light transmittance increases as the liquid crystal applied voltage decreases. As described in FIG. 9, since the pixel voltage VR1 is lower than the pixel voltage VR2, the liquid crystal applied voltage in the pixel R1 is lower than the liquid crystal applied voltage in the pixel R2. Therefore, the light transmittance in the pixel R1 is higher than the light transmittance in the pixel R2.

  In the liquid crystal display device 1, as described with reference to FIGS. 5, 6, 7, and 8, the aperture ratio of the pixel at the end is lower than the aperture ratio of the pixel that is not at the end. A large amount of light can be shielded, so that the amount of light transmitted through the pixels at the end can be made closer to the amount of light transmitted through the pixels not at the end. Preferably, the aperture ratio may be determined so that the amount of light transmitted through the end pixel is equal to the amount of light transmitted through the pixel not located at the left end.

  In the liquid crystal display device 1 having about 230,000 pixels, it has been confirmed that it is preferable to lower the aperture ratio of each pixel at the end by about 5% with respect to the aperture ratio of the pixel not at the end.

  As described above, the liquid crystal display device 1 according to the present embodiment is formed such that a plurality of parallel signal lines and a plurality of parallel scanning lines intersect, and a liquid crystal panel in which pixels are arranged at each intersection. And a scanning line driving circuit 17 as scanning line driving means for sequentially driving each scanning line, and when writing a video signal to each pixel arranged at the intersection of the driven same scanning line and each signal line The video signal writing means for writing the video signal to the pixel group including the end pixel (red pixel group) first and writing the video signal to the other pixel groups (green and blue pixel groups) later. A signal line driving circuit 18 and a signal line switching circuit 19 are provided.

  In the liquid crystal display device 1 of the present embodiment, the aperture ratio of the pixel at the end is lower than the aperture ratio of the pixel that is not at the end, so that more light is shielded at the end pixel. Transmission of light between end pixels and non-end pixels due to a difference in the liquid crystal applied voltage between the end pixels and non-end pixels when a video signal is written to the pixel group later The difference in rate can be reduced, so that it is possible to prevent the pixels at the end from increasing in brightness and appear unnaturally bright or recognized as bright lines, and as a result, display quality can be improved.

  Further, in the liquid crystal display device 1, the aperture ratio of the end pixel can be lowered by thickening the signal line corresponding to the end pixel.

  Further, in the liquid crystal display device 1, the aperture ratio of the end pixel can be reduced by thickening the signal line adjacent to the signal line corresponding to the end pixel.

  Further, in the liquid crystal display device 1, the aperture ratio of the end pixel can be lowered by including a light shielding pattern having a light shielding property in the opening of the end pixel.

  In the liquid crystal display device 1, the aperture ratio of the pixel at the end can be lowered by configuring the light shielding pattern in at least one of the layers constituting the pixel switch.

  Moreover, in the liquid crystal display device 1, the aperture ratio of the pixel at the end can be lowered by configuring the light shielding pattern on the counter substrate.

1 is a diagram schematically showing a configuration of a liquid crystal display device 1 according to an embodiment of the present invention. It is a circuit diagram of each pixel arranged in the horizontal scanning direction. 3 is a diagram for explaining a configuration of a signal line switching circuit 19. FIG. FIG. 3 is a diagram illustrating a cross section of a portion provided with a liquid crystal layer in the liquid crystal display device 1. 4 is a plan view of the pixel R2 and its peripheral portion when viewed from the liquid crystal layer 130 toward the array substrate 11. FIG. FIG. 3 is a plan view when the pixel R1 and its peripheral part are viewed from the liquid crystal layer 130 toward the array substrate 11. FIG. 2 is a plan view of the pixel R1 and its peripheral portion when the width of an adjacent signal line X is widened and viewed from the liquid crystal layer 130 toward the array substrate 11. FIG. 3 is a plan view of the pixel R1 and its peripheral part when a light shielding pattern is provided and viewed from the liquid crystal layer 130 toward the array substrate 11. FIG. 6 is a waveform diagram showing a voltage of a signal VCOM, a voltage of a write signal WR (R), a pixel voltage VR1, and a pixel voltage VR2. It is a figure which shows the change of the transmittance | permeability of the light in a liquid crystal when a liquid crystal applied voltage is changed.

Explanation of symbols

1 Liquid crystal display device 2 FPC
11 Array substrate 12 Counter substrate 13 Sealing material 14 Pixel TFT
15 pixel electrode 16a liquid crystal capacitive element 16b liquid crystal capacitive element 17 scanning line driving circuit 17S scanning line driving circuit control signal 18 signal line driving circuit 19 signal line switching circuit 21 external driving circuit 100 liquid crystal panel 111, 121 glass substrate 112 auxiliary capacitance line 113 Organic insulating film 114 Electrode wiring 115, 124 Alignment film 122 Filter layer 123 Counter electrode 130 Liquid crystal layer 140 Light-shielding pattern 191 Changeover switch 1221 Color filter part 1222 Light-shielding part C ... Coupling capacitance G1, G2, ..., R1, R2, ..., B1, B2, ... Pixel L ... Signal line spacing SIGa ... Analog video signal SIGd ... Digital video signal VCOM ... Signal to counter electrode W ... Pixel electrode width WR (R), WR (G), WR (B ) Write signal X ... Signal line Y ... Scan line ΔVR Pixel voltage R1 and the voltage difference between the pixel voltage VR2

Claims (6)

A liquid crystal panel in which a plurality of parallel signal lines and a plurality of parallel scanning lines are formed so as to intersect each other, and a pixel is arranged at each intersection;
Scanning line driving means for sequentially driving the scanning lines;
When writing the video signal to each pixel arranged at the intersection of the same driven scanning line and each signal line, the video signal is written first to the pixel group including the end pixel, and then the other Video signal writing means for writing a video signal to the pixel group,
A liquid crystal display device, wherein an aperture ratio of the pixel at the end is lower than an aperture ratio of a pixel not at the end.   2. The liquid crystal display device according to claim 1, wherein a signal line corresponding to the pixel at the end is thickened.   3. The liquid crystal display device according to claim 1, wherein a signal line adjacent to the signal line corresponding to the pixel at the end is thickened.   4. The liquid crystal display device according to claim 1, wherein a light-shielding pattern having a light-shielding property is included in the opening of the pixel at the end.   5. The liquid crystal display device according to claim 1, wherein the light shielding pattern is formed in at least one of layers constituting the pixel switch. 6. The liquid crystal display device according to claim 1, wherein the light shielding pattern is formed on the counter substrate.

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