JP2019174843A - Liquid crystal display device and electronic apparatus - Google Patents

Abstract

To suppress such a situation that a reverse tilt domain near a light-shielding film having a smaller width in light-shielding films intersecting each other is easily visible.SOLUTION: A liquid crystal display device includes: a liquid crystal panel having an element substrate where pixel electrodes arranged in first and second directions are disposed, a counter substrate, a liquid crystal layer, and first and second light-shielding films extending in the first and second directions along side lines of the pixel electrodes, in which the first light-shielding film has a smaller width compared to the second light-shielding film; a correction unit that identifies a set of pixel electrodes where a reverse tilt domain is induced, based on an input image signal and corrects the input image signal so as to decrease a difference in voltages applied in the identified set of pixel electrodes; and a drive unit that applies voltages to the pixel electrodes based on the corrected input image signal. The correction unit corrects the input image signal in such a manner that when two pixel electrodes included in the identified set of pixel electrodes are arranged in the second direction, a reduction amount of the difference in the applied voltage is greater compared to a correction when the two pixel electrodes are arranged in the first direction.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a liquid crystal display device and an electronic apparatus.

  A liquid crystal display device is used as a light valve of a projector. In a liquid crystal panel included in a liquid crystal display device, a plurality of pixel electrodes are arranged in a horizontal direction and a vertical direction. A predetermined voltage is applied to each pixel electrode based on the image signal. A lateral electric field is generated due to the application of different voltages between the pixel electrodes arranged in the horizontal direction or the vertical direction. Due to the transverse electric field, a reverse tilt domain, which is a region where the alignment of the liquid crystal is disturbed, may occur. In order to suppress the occurrence of a reverse tilt domain, a technique for correcting an image signal has been proposed (see, for example, Patent Document 1).

Japanese Patent No. 5454592

  By the way, the liquid crystal panel is provided with a light shielding film that extends in the horizontal direction and the vertical direction and intersects in plan view so as to define an opening region (translucent region) of each pixel. These light shielding films are formed by, for example, scanning lines and data lines. The width of the scanning line and the width of the data line are not necessarily equal.

  As will be described in detail later, according to the study of the present inventor, the reverse tilt domain generated in the vicinity of the relatively narrow light shielding film among the intersecting light shielding films is the relatively wide one. It was found that it was easier to see in the aperture area of the pixel than the reverse tilt domain generated in the vicinity of the light shielding film.

  The present invention has been made in view of the above-described circumstances, and provides a technique capable of suppressing a situation in which a reverse tilt domain is easily visually recognized in the vicinity of a light shielding film having a narrower width among intersecting light shielding films. This is one of the resolution issues.

  In order to solve the above problems, an aspect of a liquid crystal display device according to the present invention includes an element substrate provided with a plurality of pixel electrodes arranged in a first direction and a second direction intersecting the first direction. A counter substrate provided with a common electrode; a liquid crystal layer sandwiched between the element substrate and the counter substrate; a first light-shielding film extending in the first direction along a side of the pixel electrode; and A second light-shielding film extending in the second direction along the side of the pixel electrode, and the first light-shielding film is narrower than the width of the second light-shielding film. Based on the input image signal, a set of pixel electrodes determined that a difference between voltages to be applied to each of the two pixel electrodes is equal to or greater than a predetermined value and a reverse tilt domain is generated is specified. In order to reduce the difference in applied voltage in the set of pixel electrodes, A correction unit that corrects the image signal; and a drive unit that applies a voltage to the plurality of pixel electrodes based on the input image signal corrected by the correction unit, wherein the correction unit includes the specified pixel. When two pixel electrodes included in a set of electrodes are arranged in the second direction, the difference between the applied voltages is reduced as compared with the correction performed when the two pixel electrodes are arranged in the first direction. When the input image signal is corrected so as to increase the amount and two pixel electrodes included in the specified set of pixel electrodes are arranged in the first direction, the two pixel electrodes are in the second direction. The input image signal is corrected so that the amount of decrease in the difference between the applied voltages is smaller than the correction performed in the case where the lines are arranged.

  According to the above aspect, when two pixel electrodes included in the set of pixel electrodes specified by the correction unit are arranged in the second direction, the correction is performed so that the amount of decrease in the difference in applied voltage is large. The situation in which the reverse tilt domain is easily visually recognized in the second direction compared to the direction can be suppressed. Further, when two pixel electrodes included in the set of pixel electrodes specified by the correction unit are arranged in the first direction, the correction of the display voltage caused by the correction is performed by performing a correction with a small reduction amount of the applied voltage difference. Change can be suppressed.

  In order to solve the above problems, an aspect of a liquid crystal display device according to the present invention includes an element substrate provided with a plurality of pixel electrodes arranged in a first direction and a second direction intersecting the first direction. A counter substrate provided with a common electrode; a liquid crystal layer sandwiched between the element substrate and the counter substrate; a first light-shielding film extending in the first direction along a side of the pixel electrode; and A liquid crystal panel having a second light shielding film extending in the second direction along a side of the pixel electrode, the first light shielding film being narrower than a width of the second light shielding film, and an input image A signal processing unit that applies a voltage to the plurality of pixel electrodes based on a signal, and the signal processing unit is a pixel corresponding to a first pixel electrode among the plurality of pixel electrodes as the input image signal. Is displayed at the first gradation level, and the pixels corresponding to the remaining other pixel electrodes are An image signal to be displayed at a second gradation level smaller than the first gradation level, or a pixel corresponding to the first pixel electrode among the plurality of pixel electrodes is displayed at a third gradation level. When the image signal to be displayed at the fourth gradation level larger than the third gradation level is input to the pixels corresponding to the remaining other pixel electrodes, the first pixel electrode, A first applied voltage difference, which is a difference in applied voltage with a second pixel electrode arranged on a side where a reverse tilt domain is likely to occur in the first direction with respect to the first pixel electrode, the first pixel electrode, and the first pixel electrode A second applied voltage difference, which is a difference in applied voltage with a third pixel electrode arranged on the side where the reverse tilt domain hardly occurs in the first direction with respect to the pixel electrode, the first pixel electrode, and the first pixel electrode Against the second direction A third applied voltage difference, which is a difference in applied voltage with the fourth pixel electrode arranged on the side where the fault domain is likely to occur, and the first pixel electrode and the first pixel electrode in the second direction The fourth applied voltage difference, which is the difference between the applied voltages with the fifth pixel electrodes arranged on the side where the tilt domain is difficult to occur, is smaller than the second applied voltage difference, and the first applied voltage difference is smaller. The input image signal is corrected so that the third applied voltage difference is smaller than the four applied voltage differences and the third applied voltage difference is smaller than the first applied voltage difference; A voltage is applied to the pixel electrode.

  According to the aspect, by reducing the third applied voltage difference compared to the first applied voltage difference, it is possible to suppress a situation in which the reverse tilt domain is easily visually recognized in the second direction compared to the first direction.

  In order to solve the above problems, an aspect of a liquid crystal display device according to the present invention includes an element substrate provided with a plurality of pixel electrodes arranged in a first direction and a second direction intersecting the first direction. A counter substrate provided with a common electrode; a liquid crystal layer sandwiched between the element substrate and the counter substrate; a first light-shielding film extending in the first direction along a side of the pixel electrode; and A liquid crystal panel having a second light shielding film extending in the second direction along a side of the pixel electrode, the first light shielding film being narrower than a width of the second light shielding film, and an input image A signal processing unit that applies a voltage to the plurality of pixel electrodes based on a signal, and the signal processing unit is a pixel corresponding to a first pixel electrode among the plurality of pixel electrodes as the input image signal. Is displayed at the first gradation level, and the pixels corresponding to the remaining other pixel electrodes are An image signal to be displayed at a second gradation level smaller than the first gradation level, or a pixel corresponding to the first pixel electrode among the plurality of pixel electrodes is displayed at a third gradation level. The pixels corresponding to the remaining other pixel electrodes correspond to the first pixel electrode when an image signal to be displayed at a fourth gradation level larger than the third gradation level is input. A first transmittance difference that is a difference in transmittance between a pixel and a pixel corresponding to a second pixel electrode arranged on a side where the reverse tilt domain is likely to occur in the first direction, and the first pixel electrode; The second transmittance, which is a difference in transmittance between the pixel corresponding to the pixel electrode and the pixel corresponding to the third pixel electrode arranged on the side where the reverse tilt domain hardly occurs in the first direction. Difference, pixel corresponding to the first pixel electrode A third transmittance difference which is a difference in transmittance between the first pixel electrode and a pixel corresponding to the fourth pixel electrode arranged on the side where the reverse tilt domain is likely to occur in the second direction, and the first The fourth transmittance, which is the difference in transmittance between the pixel corresponding to the pixel electrode and the pixel corresponding to the fifth pixel electrode arranged on the side where the reverse tilt domain hardly occurs in the second direction. As for the difference, the first transmittance difference is smaller than the second transmittance difference, the third transmittance difference is smaller than the fourth transmittance difference, and compared with the first transmittance difference. Then, the input image signal is corrected so that the third transmittance difference is reduced, and a voltage is applied to the plurality of pixel electrodes.

  According to the above aspect, by reducing the third transmittance difference compared to the first transmittance difference, it is possible to suppress a situation in which the reverse tilt domain is easily visually recognized in the second direction compared to the first direction.

  In order to solve the above problems, one embodiment of an electronic device according to the present invention includes the above-described liquid crystal display device.

  According to the above aspect, since the electronic apparatus includes the liquid crystal display device described above, it is possible to suppress a situation in which the reverse tilt domain is easily visually recognized in the second direction as compared with the first direction.

It is a block diagram which shows the whole structure of the liquid crystal display device by embodiment. It is a schematic plan view which shows the arrangement | sequence of a pixel. It is a schematic plan view which expands and shows the vicinity of 1 pixel in 1st Embodiment. It is a block diagram which shows the structure of an image processing circuit. It is a schematic plan view which shows the arrangement | sequence of the pixel in the example 1 of correction | amendment. It is a schematic plan view which shows the arrangement | sequence of the pixel in the example 2 of correction | amendment. It is a schematic plan view which shows the arrangement | sequence of the pixel in the example 3 of correction | amendment. It is a schematic plan view which shows the arrangement | sequence of the pixel in the example 4 of correction | amendment. It is a schematic plan view which expands and shows the vicinity of 1 pixel in 2nd Embodiment. It is a schematic plan view which shows the arrangement | sequence of the pixel in the example 5 of correction | amendment. It is a schematic plan view which shows the light shielding film of 1 pixel. It is a schematic plan view of the display area which shows the example of a test. It is a schematic diagram which shows the optical system of the projector by an application example.

  Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. However, in each figure, the size and scale of each part are appropriately changed from the actual ones. Further, since the embodiments described below are preferable specific examples of the present invention, various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. Unless otherwise stated, the present invention is not limited to these forms.

<First Embodiment>
The liquid crystal display device 10 according to the first embodiment of the present invention will be described. First, the overall configuration of the liquid crystal display device 10 will be described. FIG. 1 is a block diagram showing the overall configuration of the liquid crystal display device 10. The liquid crystal display device 10 includes a liquid crystal panel 100 and a signal processing unit 400.

  The liquid crystal panel 100 includes an element substrate 110, a counter substrate 150, and a liquid crystal layer 170. The element substrate 110 and the counter substrate 150 are bonded to each other with a certain gap therebetween, and the liquid crystal layer 170 is sandwiched between the element substrate 110 and the counter substrate 150. In the display area 101 of the liquid crystal panel 100, a plurality of pixels 102 are arranged in the horizontal direction (X direction) and the vertical direction (Y direction). An array of the pixels 102 arranged in the X direction is called a row, and an array arranged in the Y direction is called a column.

  The element substrate 110 includes a pixel electrode 120, a thin film transistor (TFT) 130, a scanning line 141, and a data line 142. The pixel electrode 120 and the TFT 130 are provided for each pixel 102. Each pixel electrode 120 is formed of a light-transmitting conductive material and has a rectangular shape having a pair of sides extending in the X direction and a pair of sides extending in the Y direction.

  The scanning line 141 is a wiring that is provided for each row of the pixels 102, is arranged between adjacent rows of the pixels 102, extends in the row direction (X direction), and is formed of a light-blocking conductive material. . The data line 142 is provided for each column of the pixels 102, is disposed between adjacent columns of the pixels 102, extends in the column direction (in the Y direction), and is a wiring formed of a light-blocking conductive material. . In each TFT 130, the gate electrode is electrically connected to the scanning line 141, the source electrode is electrically connected to the data line 142, and the drain electrode is electrically connected to the pixel electrode 120.

  The counter substrate 150 has a common electrode 160. The common electrode 160 is formed of a light-transmitting conductive material and is formed over the entire surface of the counter substrate 150. A voltage LCcom is applied to the common electrode 160. In this example, the voltage LCcom is set to 0V. The liquid crystal layer 170 is formed of a liquid crystal having positive or negative dielectric anisotropy. The liquid crystal panel 100 operates in, for example, a TN (Twisted Nematic) mode or a VA (Vertical Alignment) mode. In order to control the alignment orientation of the liquid crystal, an alignment film is formed on each of the element substrate 110 and the counter substrate 150. The liquid crystal panel 100 is used as a display device while being sandwiched between a polarizing plate disposed outside the element substrate 110 and a polarizing plate disposed outside the counter substrate 150.

  The signal processing unit 400 includes a control unit 200 and a driving unit 300. As will be described below, the signal processing unit 400 applies a voltage to the plurality of pixel electrodes 120 based on an input image signal (hereinafter also referred to as an image signal) Via. The control unit 200 is supplied with the image signal Via from the host device in synchronization with the synchronization signal Sync. The image signal Via is digital data that designates the gradation level of each pixel 102 in the liquid crystal panel 100, and is supplied in the order of scanning according to the vertical scanning signal, horizontal scanning signal, and dot clock signal included in the synchronization signal Sync. Is done. The image signal Via designates the gradation level, but since the applied voltage to the pixel electrode 120 of each pixel 102 is determined according to the gradation level, the image signal Via is a signal that designates the applied voltage to the pixel electrode 120. You may catch it.

  The control unit 200 includes a scanning control circuit 210 and an image processing circuit 220. The scanning control circuit 210 generates various control signals and controls each unit in synchronization with the synchronization signal Sync. The image processing circuit 220 processes the digital image signal Via and outputs an analog image signal Vx. The image processing circuit 220 corrects the image signal Via. Details of the image processing circuit 220 will be described later.

  The driving unit 300 includes a scanning line driving circuit 310 and a data line driving circuit 320. The scanning line driving circuit 310 supplies the scanning signals Y1, Y2, Y3,..., Ym to the scanning lines 141 in accordance with the control signal Yctr given from the scanning control circuit 210. The data line driving circuit 320 supplies data signals X 1, X 2, X 3,..., Xn to the data line 142 in accordance with the control signal Xctr given from the scanning control circuit 210. The data signals X 1, X 2, X 3,..., Xn are generated based on the image signal Vx supplied from the image processing circuit 220.

  In response to the scanning signals Y1, Y2, Y3,..., Ym, the TFT 130 is turned on at a predetermined timing, so that the data signals X1, X2, X3,. Written. That is, a voltage corresponding to the data signal is applied to the pixel electrode 120. The written data signal is held for a predetermined period in a liquid crystal capacitor formed between the pixel electrode 120 and the common electrode 160. Note that a storage capacitor may be provided in each pixel 102 in order to suppress leakage of the written data signal.

  In this manner, in each pixel 102, a voltage is applied to the pixel electrode 120, and the alignment state of the liquid crystal layer 170 changes according to the applied voltage level, whereby the light incident on the liquid crystal layer 170 is modulated, Gray scale display is possible.

  Next, the details of the structure of the liquid crystal panel 100 will be described. In addition, a reverse tilt domain generated in the liquid crystal layer 170 will be described. Hereinafter, the operation in the normally black mode will be described. FIG. 2 is a schematic plan view showing the arrangement of the pixels 102. Viewing the liquid crystal panel 100 from a direction perpendicular to the surface of the pixel electrode 120 or a direction perpendicular to the surface of the common electrode 160 is referred to as a plan view.

  FIG. 2 shows a pixel P0, a pixel PR1 arranged on one side in the X direction (right side of the drawing) with respect to the pixel P0, a pixel PL1 arranged on the other side (left side of the drawing) in the X direction with respect to the pixel P0, A pixel PD1 arranged on one side in the Y direction (lower side in the drawing) with respect to the pixel P0 and a pixel PU1 arranged on the other side in the Y direction (upper side in the drawing) with respect to the pixel P0 are shown. Pixel electrodes E0, ER1, EL1, ED1, and EU1 are provided in the pixels P0, PR1, PL1, PD1, and PU1, respectively. The outlines of the pixels P0, PR1, PL1, PD1, and PU1 are indicated by two-dot chain lines, and the outlines of the pixel electrodes E0, ER1, EL1, ED1, and EU1 are indicated by broken lines.

  In the example shown in FIG. 2, the pixel P0 is displayed at the highest gradation level that can be expressed. That is, the highest voltage (for example, 5 V) that can be applied is applied to the pixel electrode E0. Further, the remaining other pixels PR1, PL1, PD1, and PU1 are displayed with the smallest representable gradation level. That is, the smallest applicable voltage (for example, 0 V) is applied to the pixel electrodes ER1, EL1, ED1, and EU1. The applied voltage corresponding to the highest representable gradation level may be different depending on the operation mode of the liquid crystal display device 10. For example, the applied voltage corresponding to the largest gradation level that can be expressed in a certain operation mode may be 5V, and the applied voltage corresponding to the largest gradation level that can be expressed in another operation mode may be 4V.

  In a technology related to a liquid crystal display device, a reverse is a region in which the alignment of liquid crystal is disturbed in a shape substantially along an adjacent side due to an increase in a difference in applied voltage (lateral electric field) between adjacent pixel electrodes. It is known that a tilt domain (hereinafter also referred to as a domain) occurs. However, even if the horizontal electric field is the same, a domain is likely to occur on the side of the pixel electrode adjacent in a certain direction, but a domain is unlikely to occur on the side of the pixel electrode adjacent in the opposite direction. There is. It should be noted that the occurrence of a domain is not particularly problematic between pixel electrodes arranged in an oblique direction.

  In the example of FIG. 2, a large horizontal electric field is similarly generated between the pixel electrode E0 and each of the pixel electrodes ER1 and EL1 adjacent to the pixel electrode E0 in the X direction. This shows a situation where RTX has occurred and no domain has occurred on the pixel electrode EL1 side. In the example of FIG. 2, a large lateral electric field is similarly generated between the pixel electrode E0 and each of the pixel electrodes ED1 and EU1 adjacent to the pixel electrode E0 in the Y direction. Indicates a situation where a domain RTY has occurred and no domain has occurred on the pixel electrode EU1 side. Domains RTX and RTY are shown with a right-up hatching. The domains RTX and RTY are easily visually recognized as areas where the brightness is reduced in the pixel P0 displayed with a large gradation level.

  The scanning line 141 is disposed on the boundary between the pixels 102 adjacent to each other in the Y direction, and the upper end portion of the pixel electrode 120 provided in the lower pixel 102 among the pixels 102 adjacent in the Y direction; A width overlapping with the lower end of the pixel electrode 120 provided in the upper pixel 102 is provided. The data line 142 is disposed on the boundary between the pixels 102 adjacent to each other in the X direction, and the left end of the pixel electrode 120 provided on the right pixel 102 among the pixels 102 adjacent in the X direction, and the left side. And a width overlapping with the right end of the pixel electrode 120 provided in the pixel 102.

  The scanning line 141 constitutes a light shielding film extending in the X direction along the side extending in the X direction of the pixel electrode 120. The data line 142 constitutes a light shielding film that intersects the scanning line 141 in plan view and extends in the Y direction along the side extending in the Y direction of the pixel electrode 120. An area inside the pixel electrode 120 (in the pixel 102) surrounded by the scanning line 141 and the data line 142 in a plan view is an opening area (translucent area) 103 through which light is transmitted. On the other hand, the area where the scanning line 141 or the data line 142 is provided in a plan view is a non-opening area (light-shielding area) 104 where light is shielded at the boundary between the pixels 102.

  FIG. 3 is a schematic plan view showing the vicinity of the pixel P0 in FIG. 2 in an enlarged manner. In the first embodiment, the scanning line 141 and the data line 142 included in the liquid crystal panel 100 are narrower in the width (dimension in the Y direction) wy of the scanning line 141 than the width (dimension in the X direction) wx of the data line 142. It is provided in an aspect.

  The domain RTX is generated along the side extending in the Y direction of the pixel electrode E0 between the pixel electrode E0 and the pixel electrode ER1 adjacent in the X direction (in the vicinity of the sides facing the pixel electrodes E0 and ER1). is doing. The width (dimension in the X direction) of the domain RTX is dx. The domain RTY is generated along a side extending in the X direction of the pixel electrode E0 between the pixel electrode E0 and the pixel electrode ED1 adjacent to each other in the Y direction (in the vicinity of the sides facing the pixel electrodes E0 and ED1). is doing. The width (dimension in the Y direction) of the domain RTY is dy.

  The orientation 171 of the liquid crystal in the liquid crystal layer 170 is along the direction that bisects the angle formed by the side of the pixel electrode E0 along which the domain RTX is aligned and the side of the pixel electrode E0 along which the domain RTX is aligned. 45 ° with each other. Since the orientation 171 of the liquid crystal is set to make an angle equal to each of the X direction and the Y direction (that is, 45 °), the domain RTX generated between the pixels 102 adjacent in the X direction and the Y direction The domain RTY generated between the adjacent pixels 102 is generated under the same condition, and the width dx of the domain RTX is equal to the width dy of the domain RTY.

  Due to the fact that the width wy of the scanning line 141 is narrower than the width wx of the data line 142, the width dya that the domain RTY protrudes into the opening region 103 of the pixel P0 is the width dya that the domain RTX has in the opening region 103 of the pixel P0. It is wider than the protruding width dxa. For this reason, in the opening area 103 of the pixel P0, the domain RTY is more visible than the domain RTX.

  As can be understood from the above description, the scanning line 141 and the data line 142 are provided in such a manner that the width wx of the data line 142 is narrower than the width wy of the scanning line 141, contrary to the example of FIG. In such a case, the domain RTX is more visible than the domain RTY.

  That is, the domain (domain RTY in the example of FIG. 3) generated in the vicinity of the relatively narrow (narrow) light-shielding film (scanning line 141 in the example of FIG. 3) is relatively wide. This is easier to see than the domain (domain RTX in the example of FIG. 3) generated near the (wider) light shielding film (the data line 142 in the example of FIG. 3), and the width direction of the narrow light shielding film (FIG. In the example of FIG. 3, the Y direction, which is the width direction of the scanning line 141, is compared to the width direction of the wide light shielding film (X direction, which is the width direction of the data line 142 in the example of FIG. 3). In the example of FIG. 3, the domain RTY) is easily visible.

  As will be described later in detail, the liquid crystal display device 10 according to the present embodiment corrects the image signal Via input to the image processing circuit 220 by the image processing circuit 220, thereby suppressing the occurrence of domains. In this correction, a stronger correction is performed in the direction corresponding to the width direction of the narrow light-shielding film among the intersecting light-shielding films so that the domain is easily visible, so that the vicinity of the narrow light-shielding film is obtained. Suppress the situation where the generated domain is easily visible.

  Next, the image processing circuit 220 will be described. In addition, an example of correcting the image signal Via by the image processing circuit 220 will be described. FIG. 4 is a block diagram illustrating the configuration of the image processing circuit 220. The example image processing circuit 220 includes a frame memory controller (FMC) 230, a frame memory (FM) 231, a correction unit 240, and a digital analog (D / A) converter 250.

  The image signal Via is supplied from the host device to the FMC 230 and is stored in the FM 231 via the FMC 230. The image signal Via stored in the FM 231 is supplied to the correction unit 240 via the FMC 230.

  The image signal Via is corrected by the correction unit 240. Therefore, hereinafter, the image signal Via input to the correction unit 240 may be referred to as a pre-correction image signal Via, and the image signal Vib output from the correction unit 240 may be referred to as a post-correction image signal Vib. Note that the pre-correction image signal Via is corrected as necessary to suppress the occurrence of a domain, as will be understood from the following description. Therefore, the pre-correction image signal Via does not need to be corrected when it is a signal that does not generate a domain (a signal that does not include a set of pixel electrodes 120 specified by the risk boundary detection unit 241 described later). When the pre-correction image signal Via is not corrected, the pre-correction image signal Via that is the image signal Via input to the correction unit 240 and the post-correction image signal Vib that is the image signal Vib output from the correction unit 240 are: May match.

  The pre-correction image signal Via determines the voltage to be applied to the pixel electrode 120 provided in each pixel 102 by determining the gradation level of each pixel 102. Here, the “voltage to be applied” to a certain pixel electrode 120 indicates an applied voltage corresponding to the gray level as it is designated by the pre-correction image signal Via. Therefore, in the corrected image signal Vib, when the applied voltage to the pixel electrode 120 is corrected, the actual applied voltage is a value different from the “voltage to be applied”.

  The correction unit 240 includes a risk boundary detection unit 241, a correction amount setting unit 242, and a correction calculation unit 243. The pre-correction image signal Via is supplied to the risk boundary detection unit 241. Based on the pre-correction image signal Via, the risk boundary detection unit 241 determines that the difference between the voltages to be applied to each of the two adjacent (adjacent) pixel electrodes 120 is equal to or greater than a predetermined value and a domain is generated. A set of pixel electrodes 120 to be identified is specified. That is, a boundary between two pixel electrodes 120 included in the specified set of pixel electrodes 120, that is, a boundary between pixels 102 corresponding to these pixel electrodes 120 is detected as a boundary (risk boundary) where a domain occurs. Is done.

  The description will be continued with reference to FIG. 5 in addition to FIG. FIG. 5 is a schematic plan view of the arrangement of the pixels 102 showing Example 1 of correcting the image signal Via. The applied voltage corresponding to the uncorrected image signal Via (that is, “voltage to be applied”) is shown on the left side of FIG. 5, and the applied voltage corresponding to the corrected image signal Vib is shown on the right side of FIG. Within each pixel 102, the applied voltage is shown in V units.

  As shown in the left part of FIG. 5, the applied voltage corresponding to the pre-correction image signal Via is the same as the example shown in FIG. FIG. 5 shows two adjacent pixels PR2 and PR3 arranged on the right side in the X direction with respect to the pixel P0, and two adjacent pixels PL2 and 3 arranged on the left side in the X direction with respect to the pixel P0. Two adjacent pixels PL3, two adjacent pixels PD2 and three adjacent pixels PD3 arranged below the pixel P0 in the Y direction, and two adjacent pixels arranged above the pixel P0 in the Y direction PU2 and three adjacent pixels PU3 are additionally shown. Pixel electrodes E0, ER1 to ER3, EL1 to EL3, ED1 to ED3, and EU1 to EU3 are provided on the pixels P0, PR1 to PR3, PL1 to PL3, PD1 to PD3, and PU1 to PU3, respectively. A pixel P0 that is displayed at a large gradation level with a voltage to be applied of 5 V is shown in white. In addition, the pixels PR1 to PR3, PL1 to PL3, PD1 to PD3, and PU1 to PU3 displayed at a small gradation level with a voltage to be applied are 0 V, and are shown with cross hatching.

  In the example illustrated in FIG. 5, the following set of pixel electrodes 120 is specified by the risk boundary detection unit 241. The predetermined value of the difference between the voltages to be applied is, for example, 4.0V. A set of pixel electrodes E0 and ER1, and a set of pixel electrodes 120 that are determined to generate a domain when a difference between voltages to be applied to each of the two pixel electrodes 120 arranged is 4.0 V or more. Two pairs of electrodes E0 and ED1 are specified. A set of pixel electrodes 120 arranged in the X direction, such as a set of pixel electrodes E0, ER1, is referred to as a set in the X direction, and a set of pixel electrodes 120 arranged in the Y direction, such as a set of pixel electrodes E0, ED1, is used. The set is referred to as a Y-direction set.

  Note that for the set of pixel electrodes E0 and EL1 and the set of pixel electrodes E0 and EU1, the difference between the voltages to be applied to each of the two pixel electrodes 120 arranged is 4.0 V or more. As described with reference to, it is determined that no domain occurs. For this reason, the set of pixel electrodes E0 and EL1 and the set of pixel electrodes E0 and EU1 are not a set of pixel electrodes 120 specified by the risk boundary detection unit 241. Note that, when the voltage difference (lateral electric field) to be applied is large, how the domains are generated in the group of the pixel electrodes 120 arranged can be determined by the orientation direction set in the liquid crystal layer 170.

  Data indicating a set of pixel electrodes 120 identified by the risk boundary detection unit 241 (hereinafter sometimes simply referred to as a set of pixel electrodes 120) is input to a correction amount setting unit (calculation unit) 242. The correction amount setting unit 242 sets (calculates) the correction amount of the applied voltage to the two pixel electrodes 120 included in the set of pixel electrodes 120 so that the difference between the applied voltages in the set of pixel electrodes 120 decreases. . Note that the correction amount may be set not as a voltage value but as a gradation level.

  The correction amount setting unit 242 includes a horizontal setting unit 242x and a vertical setting unit 242y. The correction amount is set by the horizontal setting unit 242x for the set of pixel electrodes 120 that is a set in the X direction (that is, in the horizontal direction). The correction amount is set by the vertical setting unit 242y for the set of pixel electrodes 120 that is a set in the Y direction (that is, the vertical direction).

  In the example shown in FIG. 5, the following correction amount is set by the correction amount setting unit 242. The correction amount is set by the horizontal setting unit 242x for the set of pixel electrodes E0 and ER1 that are sets in the X direction. -0.5V is set as the correction amount of the pixel electrode E0 whose voltage to be applied is 5V. As a correction amount of the pixel electrode ER1 whose voltage to be applied is 0V, + 1.0V is set. That is, 4.5V is set as the applied voltage of the corrected pixel electrode E0, and 1.0V is set as the applied voltage of the corrected pixel electrode ER1. Therefore, the applied voltage difference between the pixel electrodes E0 and ER1 decreases from 5.0V before correction to 3.5V after correction, and the amount of decrease in the applied voltage difference due to correction is 1.5V.

  The correction amount is set by the vertical setting unit 242y for the set of pixel electrodes E0 and ED1 that are set in the Y direction. -0.5V is set as the correction amount of the pixel electrode E0 whose voltage to be applied is 5V. As a correction amount of the pixel electrode ED1 whose voltage to be applied is 0V, + 1.5V is set. That is, 4.5V is set as the applied voltage of the corrected pixel electrode E0, and 1.5V is set as the applied voltage of the corrected pixel electrode ED1. Therefore, the applied voltage difference between the pixel electrodes E0 and ED1 decreases from 5.0V before correction to 3.0V after correction, and the amount of decrease in the applied voltage difference due to correction becomes 2.0V.

  Data indicating the correction amount for the set of pixel electrodes 120 set by the correction amount setting unit 242 is input to the correction calculation unit 243. Further, the pre-correction image signal Via is supplied from the FMC 230 to the correction calculation unit 243. The correction calculation unit 243 corrects the uncorrected image signal Via using data indicating the correction amount for the set of pixel electrodes 120, and generates the corrected image signal Vib. The corrected image signal Vib is converted into an analog image signal Vx by the D / A converter 250, and the image signal Vx is supplied to the drive unit 300 (data line drive circuit 320).

  In the example illustrated in FIG. 5, the corrected image signal Vib as described below is generated by the correction amount calculation unit 243. As shown in the right part of FIG. 5, the corrected image signal Vib is applied to the pixel electrodes ER2, ER3, EL1 to EL3, ED2, ED3, and EU1 to EU3, as in the case of the precorrected image signal Via. It is a signal which shows. In other words, the pixels corresponding to these pixel electrodes are not corrected. Further, the post-correction image signal Vib is corrected from the pre-correction image signal Via as described above for the pixel electrodes E0, ER1, and ED1, and indicates applied voltages of 4.5V, 1.0V, and 1.5V, respectively. Signal.

  As described above, in the present embodiment, the applied voltages of the pixel electrodes E0, ER1, and ED1 are corrected to reduce the applied voltage difference between the pixel electrodes E0, ER1 by 1.5 V, and between the pixel electrodes E0, ED1. The applied voltage difference is reduced by 2.0V. In this way, the corrected image signal Via is corrected to generate the corrected image signal Vib so that the difference in the applied voltage in the specified set of pixel electrodes 120 is reduced, and the liquid crystal panel 100 is adjusted by the corrected image signal Vib. By driving, the generation of domains can be suppressed.

  Further, in the present embodiment, the applied voltage difference in the set of pixel electrodes E0 and ED1 in which the difference in the voltage to be applied is equal to this set as compared with the decrease amount 1.5 V of the applied voltage difference in the set of pixel electrodes E0 and ER1. The amount of decrease is increased to 2.0V. In other words, when two pixel electrodes 120 included in the specified set of pixel electrodes 120 are arranged in the Y direction, application is performed compared to correction performed when the two pixel electrodes 120 are arranged in the X direction. Strong correction is performed so that the amount of decrease in the voltage difference increases.

  Thereby, generation | occurrence | production of the domain RTY which is easy to visually recognize can be suppressed more strongly compared with generation | occurrence | production of the domain RTX. That is, the width dy of the domain RTY can be made narrower than the width dx of the domain RTX. Therefore, it is possible to suppress a situation in which the domain RTY generated in the vicinity of the scanning line 141 which is a narrow light shielding film is easily visible (a situation in which the domain is easily visible in the Y direction).

  In other words, in this embodiment, when the two pixel electrodes 120 included in the specified set of pixel electrodes 120 are arranged in the X direction, the two pixel electrodes 120 are arranged in the Y direction. The correction is performed so that the amount of decrease in the difference in applied voltage is smaller than the correction.

  Thereby, it is possible to reduce the correction amount of the applied voltage for suppressing the occurrence of the domain RTX that is generated in the vicinity of the data line 142 and is less visible. Due to the change in the voltage applied to the pixel electrode 120, the display state (transmittance) of the corresponding pixel 102 changes. Therefore, from the viewpoint of maintaining display quality, it is preferable that the correction amount of the applied voltage is small (not excessive). Thus, by reducing the correction amount of the applied voltage, it is possible to suppress a change in the display state caused by the correction.

  Hereinafter, another example of the correction of the pre-correction image signal Via will be described. First, correction example 2 will be described. FIG. 6 is a schematic plan view of the arrangement of the pixels 102 showing the second correction example. The applied voltage corresponding to the pre-correction image signal Via is the same as that shown in the left part of FIG. FIG. 6 shows an applied voltage corresponding to the corrected image signal Vib in the correction example 2.

  Differences from the correction example 1 will be described. In the correction example 1, the corrected applied voltage of the pixel electrode ED1 is 1.5V, whereas in the correction example 2, the corrected applied voltage of the pixel electrode ED1 is increased to 1.7V. . That is, stronger correction is performed by further reducing the applied voltage difference between the pixel electrodes E0 and ED1.

  In the correction example 1, the pixel electrode ED2 is not corrected and the applied voltage is 0V, whereas in the correction example 2, the pixel electrode ED2 is also corrected and the applied voltage is 1.0V. This is because the difference in the applied voltage between the pixel electrodes ED1 and ED2 becomes excessively large and the domain is suppressed by further increasing the applied voltage of the pixel electrode ED1. In other words, the voltage change from the pixel electrode ED1 to the pixel electrode ED3 where the applied voltage is not corrected from 0 V is made smooth.

  As a result, in the correction example 2, the number (three) of the pixel electrodes 120 in which the applied voltage is corrected in the direction in which the domain is easy to be visually recognized (Y direction in this example) In the X direction), the applied voltage is larger than the number (two) of the pixel electrodes 120 in which the applied voltage is corrected.

  Next, correction example 3 will be described. FIG. 7 is a schematic plan view of the arrangement of the pixels 102 showing the third correction example. The applied voltage (that is, “voltage to be applied”) corresponding to the pre-correction image signal Via is shown on the left side of FIG. 7, and the applied voltage corresponding to the post-correction image signal Vib is shown on the right side of FIG.

  The applied voltage corresponding to the pre-correction image signal Via is 0 V for the pixel electrode E0, and 5 V for the remaining other pixel electrodes ER1 to ER3, EL1 to EL3, ED1 to ED3, and EU1 to EU3. The risk boundary detection unit 241 specifies a set of pixel electrodes E0 and ER1, and a set of pixel electrodes E0 and ED1.

  The correction amount setting unit 242 sets + 1.0V as the correction amount of the pixel electrode E0, sets -0.2V as the correction amount of the pixel electrode ER1, and sets -0.5V as the correction amount of the pixel electrode ED1. The That is, 1.0 V is set as the applied voltage of the corrected pixel electrode E0, 4.8 V is set as the applied voltage of the corrected pixel electrode ER1, and 4.5 V is set as the applied voltage of the corrected pixel electrode ED1. Is set. Therefore, the applied voltage difference between the pixel electrodes E0 and ER1 decreases from 5.0V before correction to 3.8V after correction, and the amount of decrease in the applied voltage difference due to correction is 1.2V. The applied voltage difference between the pixel electrodes E0 and ED1 decreases from 5.0V before correction to 3.5V after correction, and the amount of decrease in the applied voltage difference due to correction is 1.5V.

  Also in this example, a narrow light-shielding film (in this example) is obtained by performing strong correction so that the decrease amount of the difference in applied voltage is increased in the direction in which the domain is easily visible (Y direction in this example). It is possible to suppress a situation in which a domain generated in the vicinity of the scanning line 141) is easily visible.

  Next, correction example 4 will be described. FIG. 8 is a schematic plan view of the arrangement of the pixels 102 showing the fourth correction example. The applied voltage corresponding to the pre-correction image signal Via is the same as that shown in the left part of FIG. FIG. 8 shows an applied voltage corresponding to the corrected image signal Vib in the correction example 4.

  Differences from the correction example 3 will be described. In the correction example 3, the corrected applied voltage of the pixel electrode ED1 is 4.5V, whereas in the correction example 4, the corrected applied voltage of the pixel electrode ED1 is decreased to 4.0V. . That is, stronger correction is performed by further reducing the applied voltage difference between the pixel electrodes E0 and ED1.

  In the correction example 3, the pixel electrode ED2 is not corrected and the applied voltage is 5.0V, whereas in the correction example 4, the pixel electrode ED2 is also corrected to the applied voltage of 4.5V. This is because the application voltage of the pixel electrode ED1 is further reduced, so that the difference between the application voltages between the pixel electrodes ED1 and ED2 becomes excessively large and the occurrence of a domain is suppressed. In other words, the voltage change from the pixel electrode ED1 to the pixel electrode ED3 whose applied voltage is not corrected from 5.0 V is made smooth.

  As a result, in the correction example 4, the number (three) of the pixel electrodes 120 in which the applied voltage is corrected in the direction in which the domain is easily visible (Y direction in this example) In the X direction), the applied voltage is larger than the number (two) of the pixel electrodes 120 in which the applied voltage is corrected.

<Second Embodiment>
Next, the liquid crystal display device 10 according to the second embodiment will be described. FIG. 9 is a schematic plan view showing an enlarged vicinity of the pixel P0 in the liquid crystal panel 100 included in the liquid crystal display device 10 of the second embodiment. The liquid crystal display device 10 according to the second embodiment is different from the first embodiment in that the width wy of the scanning line 141 and the width wx of the data line 142 included in the liquid crystal panel 100 are equal. Other points are the same as in the first embodiment.

  In the second embodiment, since the width wy of the scanning line 141 and the width wx of the data line 142 are equal, the width dya where the domain RTY protrudes into the opening region 103 of the pixel P0 and the domain RTX within the opening region 103 of the pixel P0. The protruding width dxa is equal. For this reason, the visibility of the domain is about the same in both the X direction and the Y direction.

  FIG. 10 is a schematic plan view of the arrangement of the pixels 102, illustrating a fifth example of correction in the second embodiment. The applied voltage corresponding to the pre-correction image signal Via is the same as that shown in the left part of FIG. 5 in the first embodiment. FIG. 10 shows an applied voltage corresponding to the corrected image signal Vib in the fifth correction example.

  The risk boundary detection unit 241 specifies a set of pixel electrodes E0 and ER1, and a set of pixel electrodes E0 and ED1. The correction amount setting unit 242 sets −0.5V as the correction amount for the pixel electrode E0, + 1.5V as the correction amount for the pixel electrode ER1, and + 1.5V as the correction amount for the pixel electrode ED1. . That is, 4.5V is set as the applied voltage of the corrected pixel electrode E0, 1.5V is set as the applied voltage of the corrected pixel electrode ER1, and 1.5V is set as the applied voltage of the corrected pixel electrode ED1. Is set. Accordingly, the applied voltage difference between the pixel electrodes E0 and ER1 decreases from 5.0V before correction to 3.0V after correction, and the amount of decrease in the applied voltage difference due to correction becomes 2.0V. The applied voltage difference between the pixel electrodes E0 and ED1 decreases from 5.0V before correction to 3.0V after correction, and the amount of decrease in the applied voltage difference due to correction becomes 2.0V.

  Also in the second embodiment, domain correction can be suppressed by correcting the pre-correction image signal Via by the image processing circuit 220. In the second embodiment, the widths wx and wy of the scanning lines 141 and the data lines 142 are equal, and the domain is easily visible in both the X and Y directions. Therefore, the applied voltages are the same in both the X and Y directions. May be corrected.

  The present invention is not limited to the above-described embodiments, and various modifications as described below are possible, for example. Moreover, the aspect of the deformation | transformation described below can also combine suitably one or more selected arbitrarily.

  For example, in the above-described embodiment, the scanning line 141 is exemplified as the light shielding film extending in the X direction along the side of the pixel electrode 120. However, such a light shielding film is not limited to the scanning line 141, and the element substrate. 110 may be provided on the counter substrate 150. Further, for example, in the above-described embodiment, the data line 142 is exemplified as the light shielding film extending in the Y direction along the side of the pixel electrode 120. However, such a light shielding film is not limited to the data line 142, and the element It may be provided on the substrate 110 or on the counter substrate 150.

  In the above-described embodiment, the light shielding film (scanning line 141 and data line 142) that defines the opening region 103 of the pixel 102 is illustrated as being simplified with a constant width. The width can generally vary depending on the position. Therefore, the width of the light shielding film is defined as follows.

  FIG. 11 is an enlarged schematic plan view showing one pixel P0. The width of the light shielding film 145 extending in the X direction is defined as the minimum width wym of the light shielding film 145 on the side extending in the X direction of the pixel P0. The width of the light shielding film 146 extending in the Y direction is defined as the minimum width wxm of the light shielding film 146 on the side extending in the Y direction of the pixel P0.

  Note that the image signal Via may be an image signal constituting a still image, or may be a part of a plurality of image signals constituting a moving image.

  In the first embodiment described above, mainly the direction (first direction) in which the narrow light-shielding film (first light-shielding film) extends is the X direction, and the wide light-shielding film (second light-shielding film) extends. However, even if the narrow light-shielding film extends in the Y-direction and the wide light-shielding film extends in the X-direction, the above-described direction (second direction intersecting the first direction) is exemplified. Good. If the narrow light-shielding film extends in the Y direction, stronger correction is performed in the X direction in which the domain is easily visible.

  In the first embodiment described above, stronger correction is performed in the direction in which the domain is easily visible. That is, asymmetric correction is performed between the direction in which the domain is relatively easily visible and the direction in which the domain is relatively difficult to visually recognize. For this reason, the liquid crystal display device 10 according to the embodiment operates as follows for the following test, for example.

  FIG. 12 is a schematic plan view of the display area 101 showing an example of a test. In the illustrated test, first, display A shown in the upper left part of FIG. 12 and display B shown in the upper right part of FIG. 12 are performed. In the display A, an image signal Via indicating a display (all white display) having the highest gradation level that can represent the entire screen is input. In the display B, an image signal Via indicating a display (all black display) having the smallest gradation level that can represent the entire screen is input.

  In each of display A and display B, an oscilloscope is connected to the drive terminal of the liquid crystal panel 100, and the voltage value applied to the pixel electrode 120 is measured. Note that measurement of the voltage (transmittance) of the pixel 102 using a photodiode or the like may be used instead of measurement of a voltage applied to the pixel electrode 120 provided in the pixel 102.

  Display A and display B are displays that are uniform over the entire screen. Therefore, these are displays in which no domain due to the applied voltage difference between adjacent pixel electrodes 120 occurs, that is, a display that does not require correction for suppressing the domains. For this reason, the value of the applied voltage measured in each of the display A and the display B is the uncorrected applied voltage corresponding to the maximum representable gradation level and the smallest representable gradation level. The corresponding uncorrected applied voltage is shown.

  Next, the display C shown in the lower left part of FIG. 12 and the display D shown in the lower right part of FIG. 12 are performed. In the display C, an image signal Via indicating a display with the highest gradation level that can represent the pixels 102 for one column arranged in the Y direction and the lowest gradation level that can represent the remaining pixels 102 is input. In the display D, an image signal Via indicating a display having the highest gradation level that can represent the pixels 102 in one row arranged in the X direction and the smallest gradation level that can represent the remaining pixels 102 is input.

  In each of display C and display D, the voltage value applied to the pixel electrode 120 or the brightness (transmittance) of the pixel 102 is measured. The image signal Via input in the display C indicates a display in which the pixels 102 displayed at the lowest gradation level are arranged on both sides in the X direction of the pixels 102 displayed at the highest gradation level. For this reason, correction for domain suppression is performed. In this correction, the applied voltage in the dark pixel 102 arranged on the side where the domain is likely to occur in the X direction with respect to the bright pixel 102 becomes larger than the applied voltage in the pixel 102 arranged on the opposite side (strongly corrected). ).

  The image signal Via input in the display D indicates a display in which the pixel 102 displayed at the smallest gradation level is arranged on both sides in the Y direction of the pixel 102 displayed at the largest gradation level. For this reason, correction for domain suppression is performed. In this correction, the applied voltage at the dark pixel 102 arranged on the side where the domain is likely to occur in the Y direction with respect to the bright pixel 102 becomes larger than the applied voltage at the pixel 102 arranged on the opposite side (strongly corrected). ).

  For example, when the width of the light shielding film extending in the X direction is narrower than the width of the light shielding film extending in the Y direction, stronger correction is performed in the Y direction. Therefore, in this case, compared with the applied voltage to the pixel electrode 120 on the side that is strongly corrected in the X direction with respect to the display C, the applied voltage to the pixel electrode 120 on the side that is strongly corrected in the Y direction with respect to the display D is It becomes larger (corrected more strongly).

  Further, for example, when the width of the light shielding film extending in the Y direction is narrower than the width of the light shielding film extending in the X direction, stronger correction is performed in the X direction. Therefore, in this case, compared with the applied voltage to the pixel electrode 120 on the side that is strongly corrected in the Y direction with respect to the display D, the applied voltage to the pixel electrode 120 on the side that is strongly corrected in the X direction with respect to the display C is It becomes larger (corrected more strongly).

  Note that the image signal Via shown in the left part of FIG. 5 (the pixel 102 corresponding to one pixel electrode 120 is displayed at a predetermined large gradation level (first gradation level), and the remaining other pixel electrodes 120 are displayed. 7 corresponds to the image signal Via displayed at a gradation level (second gradation level) smaller than this, or the image signal Via shown in the left part of FIG. 7 (corresponds to one pixel electrode 120). The pixel 102 to be displayed is displayed at a predetermined small gradation level (third gradation level), and the pixels 102 corresponding to the remaining other pixel electrodes 120 are larger in gradation level (fourth gradation level). When the image signal Via) to be displayed is input, the liquid crystal display device 10 operates as follows. The direction in which the narrow light shielding film extends is defined as the X direction, and the direction in which the wide light shielding film extends is defined as the Y direction.

  The difference in applied voltage between the pixel electrode E0 (first pixel electrode) and the pixel electrode ER1 (second pixel electrode) arranged on the side where the domain is likely to occur in the X direction with respect to the pixel electrode E0 is defined as a first applied voltage difference. (For example, the correction example 1 (FIG. 5) is 3.5 V, the correction example 2 (FIG. 6) is 3.5 V, the correction example 3 (FIG. 7) is 3.8 V, and the correction example 4 (FIG. 7). Then 3.8V).

  The difference in applied voltage between the pixel electrode E0 and the pixel electrode EL1 (third pixel electrode) arranged on the side where the domain is less likely to occur in the X direction with respect to the pixel electrode E0 is expressed as a second applied voltage difference (for example, a correction example). 1 (FIG. 5) is 4.5V, correction example 2 (FIG. 6) is 4.5V, correction example 3 (FIG. 7) is 4.0V, and correction example 4 (FIG. 7) is 4.0V). To do.

  A difference in applied voltage between the pixel electrode E0 and the pixel electrode ED1 (fourth pixel electrode) arranged on the side where the domain is likely to occur in the Y direction with respect to the pixel electrode E0 is expressed as a third applied voltage difference (for example, correction example). 1 (FIG. 5) is 3.0V, correction example 2 (FIG. 6) is 2.8V, correction example 3 (FIG. 7) is 3.5V, and correction example 4 (FIG. 7) is 3.0V. To do.

  The difference in applied voltage between the pixel electrode E0 and the pixel electrode EU1 (fifth pixel electrode) arranged on the side where the domain is less likely to occur in the Y direction with respect to the pixel electrode E0 is expressed as a fourth applied voltage difference (for example, a correction example). 1 (FIG. 5) is 4.5V, correction example 2 (FIG. 6) is 4.5V, correction example 3 (FIG. 7) is 4.0V, and correction example 4 (FIG. 7) is 4.0V). To do.

  The first applied voltage difference is smaller than the second applied voltage difference, the third applied voltage difference is smaller than the fourth applied voltage difference, and the third applied voltage difference is smaller than the first applied voltage difference. Under the condition, a voltage is applied to each pixel electrode 120. That is, the signal processing unit 400 corrects the input image signal Via so that such a condition is satisfied, and applies a voltage to each pixel electrode 120. By making the third applied voltage difference smaller than the first applied voltage difference, it is possible to suppress a situation where the reverse tilt domain is easily visually recognized in the Y direction compared to the X direction.

  In addition, when the transmittance | permeability is measured instead of an applied voltage, the following conditions are satisfy | filled. Differences in transmittance between the pixel P0 corresponding to the pixel electrode E0 and the pixels PR1, PL1, PD1, and PU1 corresponding to the pixel electrodes ER1, EL1, ED1, and EU1 are referred to as first to fourth transmittance differences. To do. The first transmittance difference is smaller than the second transmittance difference, the third transmittance difference is smaller than the fourth transmittance difference, and the third transmittance difference is smaller than the first transmittance difference. Under the condition, a voltage is applied to each pixel electrode 120. That is, the signal processing unit 400 corrects the input image signal Via so that such a condition is satisfied, and applies a voltage to each pixel electrode 120. By making the third transmittance difference smaller than the first transmittance difference, it is possible to suppress a situation in which the reverse tilt domain is easily visually recognized in the Y direction compared to the X direction.

<Application example>
Next, a projection display device (projector) will be described as the liquid crystal display device 10 in the above-described embodiment. FIG. 13 is a schematic view illustrating an optical system of a projector 500 according to an application example. The projector 500 includes a light source device 501, an integrator 504, a polarization conversion element 505, a color separation light guide optical system 502, a liquid crystal light modulation device 510R as a light modulation device, a liquid crystal light modulation device 510G, and a liquid crystal light modulation device 510B. And a cross dichroic prism 512 and a projection optical system 514. The liquid crystal light modulation devices 510R, 510G, and 510B are provided with liquid crystal display devices 520R, 520G, and 520B, as will be described later. As these liquid crystal display devices 520R, 520G, and 520B, for example, the above-described liquid crystal display device 10 can be used.

  The light source device 501 includes red light (hereinafter referred to as “R light”) as the first color light, green light (hereinafter referred to as “G light”) as the second color light, and blue light (hereinafter referred to as “B light” as the third color light). ”). As the light source device 501, for example, an ultra-high pressure mercury lamp can be used.

  The integrator 504 makes the illuminance distribution of the light emitted from the light source device 501 uniform. The light whose illuminance distribution is made uniform is converted by the polarization conversion element 505 into polarized light having a specific vibration direction, for example, s-polarized light that is s-polarized with respect to the reflection surface of the color separation light guide optical system 502. The light converted into the s-polarized light is incident on the R light transmitting dichroic mirror 506R that constitutes the color separation light guide optical system 502.

  The color separation light guide optical system 502 includes an R light transmission dichroic mirror 506R, a B light transmission dichroic mirror 506G, three reflection mirrors 507, and two relay lenses 508.

  The R light transmitting dichroic mirror 506R transmits R light and reflects G light and B light. The R light transmitted through the R light transmitting dichroic mirror 506R is incident on the reflection mirror 507.

  The reflection mirror 507 bends the optical path of the R light by 90 degrees. The R light whose optical path is bent is incident on the R light liquid crystal light modulator 510R. The R light liquid crystal light modulation device 510R is a transmissive liquid crystal device that modulates R light according to an image signal.

  The R light liquid crystal light modulation device 510R includes a λ / 2 phase difference plate 523R, a glass plate 524R, a first polarizing plate 521R, a liquid crystal display device 520R, and a second polarizing plate 522R. The λ / 2 phase difference plate 523R and the first polarizing plate 521R are arranged in contact with a light-transmitting glass plate 524R that does not change the polarization direction. In FIG. 13, the second polarizing plate 522 </ b> R is provided independently, but may be disposed in contact with the exit surface of the liquid crystal display device 520 </ b> R or the incident surface of the cross dichroic prism 512.

  The G light and B light reflected by the R light transmitting dichroic mirror 506R have their optical paths bent 90 degrees. The G light and the B light whose optical paths are bent enter the B light transmitting dichroic mirror 506G. The B light transmitting dichroic mirror 506G reflects G light and transmits B light. The G light reflected by the B light transmitting dichroic mirror 506G enters the G light liquid crystal light modulation device 510G. The G light liquid crystal light modulation device 510G is a transmissive liquid crystal device that modulates G light according to an image signal. A liquid crystal light modulation device 510G for G light includes a liquid crystal display device 520G, a first polarizing plate 521G, and a second polarizing plate 522G.

  The G light incident on the G light liquid crystal light modulator 510G is converted into s-polarized light. The s-polarized light incident on the G light liquid crystal light modulator 510G passes through the first polarizing plate 521G as it is and enters the liquid crystal display 520G. The s-polarized light incident on the liquid crystal display device 520G is converted into p-polarized light by modulation according to the image signal. The G light converted into the p-polarized light by the modulation of the liquid crystal display device 520G is emitted from the second polarizing plate 522G. Thus, the G light modulated by the G light liquid crystal light modulation device 510G enters the cross dichroic prism 512.

  The B light transmitted through the B light transmitting dichroic mirror 506G enters the B light liquid crystal light modulator 510B via the two relay lenses 508 and the two reflection mirrors 507.

  The B light liquid crystal light modulation device 510B is a transmissive liquid crystal device that modulates B light according to an image signal. The B light liquid crystal light modulator 510B includes a λ / 2 phase difference plate 523B, a glass plate 524B, a first polarizing plate 521B, a liquid crystal display device 520B, and a second polarizing plate 522B.

  The B light incident on the B light liquid crystal light modulator 510B is converted into s-polarized light. The s-polarized light incident on the B-light liquid crystal light modulator 510B is converted into p-polarized light by the λ / 2 phase difference plate 523B. The B light converted into p-polarized light passes through the glass plate 524B and the first polarizing plate 521B as it is, and enters the liquid crystal display device 520B. The p-polarized light incident on the liquid crystal display device 520B is converted into s-polarized light by modulation according to the image signal. The B light converted into the s-polarized light by the modulation of the liquid crystal display device 520B is emitted from the second polarizing plate 522B. The B light modulated by the B light liquid crystal light modulation device 510B enters the cross dichroic prism 512.

  As described above, the R light transmitting dichroic mirror 506R and the B light transmitting dichroic mirror 506G constituting the color separation / light guiding optical system 502 convert the light supplied from the light source device 501 to the R light that is the first color light and the first light. The light is separated into G light that is two-color light and B light that is third-color light.

  The cross dichroic prism 512, which is a color synthesis optical system, is configured by arranging two dichroic films 512a and 512b orthogonally in an X shape. The dichroic film 512a reflects B light and transmits G light. The dichroic film 512b reflects R light and transmits G light. As described above, the cross dichroic prism 512 includes the R light, G light, and B light modulated by the R light liquid crystal light modulation device 510R, the G light liquid crystal light modulation device 510G, and the B light liquid crystal light modulation device 510B, respectively. Is synthesized.

  The projection optical system 514 projects the light combined by the cross dichroic prism 512 onto the screen 516. Thereby, a full color image can be obtained on the screen 516. Thus, the above-described liquid crystal display device 10 can be used in the projector 500 as an example.

  The liquid crystal display device 10 described above may be used for a front projection projector that projects from the side that observes the projected image, or may be used for a rear projection projector that projects from the side opposite to the side that observes the projected image. it can.

  The electronic device to which the liquid crystal display device 10 can be applied is not limited to the projector 500. The liquid crystal display device 10 is, for example, a projection type HUD (head-up display), a direct-view type HMD (head-mounted display), an electronic book, a personal computer, a digital still camera, a liquid crystal television, a viewfinder type, or a monitor direct-view type. You may use as a display part of information terminal devices, such as a video recorder, a car navigation system, an electronic notebook, and POS.

  DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device, 100 ... Liquid crystal panel, 101 ... Display area, 102 ... Pixel, 103 ... Opening area, 104 ... Non-opening area, 110 ... Element substrate, 120 ... Pixel electrode, 130 ... TFT, 141 ... Scanning line, 142 ... Data line, 145 ... Light shielding film, 146 ... Light shielding film, 150 ... Counter substrate, 160 ... Common electrode, 170 ... Liquid crystal layer, 171 ... Liquid crystal orientation, 200 ... Control unit, 210 ... Scanning control circuit, 220 ... Image Processing circuit 230 ... Frame memory controller, 231 ... Frame memory, 240 ... Correction unit, 241 ... Risk boundary detection unit, 242 ... Correction amount setting unit, 242x ... Horizontal setting unit, 242y ... Vertical setting unit, 243 ... Correction Arithmetic unit, 250 ... D / A converter, 300 ... driving unit, 310 ... scanning line driving circuit, 320 ... data line driving circuit, 400 ... signal processing unit DESCRIPTION OF SYMBOLS 500 ... Projector, 501 ... Light source device, 502 ... Color separation light guide optical system, 504 ... Integrator, 505 ... Polarization conversion element, 510R ... Liquid crystal light modulation device, 510G ... Liquid crystal light modulation device, 510B ... Liquid crystal light modulation device, 520R Liquid crystal panel, 520G ... Liquid crystal panel, 520B ... Liquid crystal panel, 512 ... Cross dichroic prism, 514 ... Projection optical system, 516 ... Screen, Via ... (before correction) image signal, Vib ... (after correction) image signal, Vx ... (Analog) image signal, P0 ... pixel, PR1 ... pixel, PL1 ... pixel, PD1 ... pixel, PU1 ... pixel, E0 ... pixel electrode, ER1 ... pixel electrode, EL1 ... pixel electrode, ED1 ... pixel electrode, EU1 ... pixel Electrode, RTX ... reverse tilt domain, RTY ... reverse tilt domain, dx ... reverse tilt Main width, dy: width of reverse tilt domain, dxa: width of protrusion of reverse tilt domain to opening area, dy: width of protrusion of reverse tilt domain to opening area, wx: width of data line, wy: width of scanning line width.

Claims (4)

An element substrate provided with a plurality of pixel electrodes arranged in a first direction and a second direction intersecting the first direction;
A counter substrate provided with a common electrode;
A liquid crystal layer sandwiched between the element substrate and the counter substrate;
A first light-shielding film extending in the first direction along the side of the pixel electrode; and a second light-shielding film extending in the second direction along the side of the pixel electrode;
And the width of the first light shielding film is narrower than the width of the second light shielding film,
LCD panel,
A set of pixel electrodes that are determined to generate a reverse tilt domain because the difference between voltages to be applied to each of the two pixel electrodes arranged side by side is equal to or greater than a predetermined value and based on an input image signal. A correction unit that corrects the input image signal so that a difference in applied voltage in the set of pixel electrodes is reduced;
A drive unit that applies a voltage to the plurality of pixel electrodes based on the input image signal corrected by the correction unit;
With
The correction unit is
When two pixel electrodes included in the specified set of pixel electrodes are arranged in the second direction, the application is performed as compared with the correction performed when the two pixel electrodes are arranged in the first direction. The input image signal is corrected so that the amount of decrease in the voltage difference is large,
When two pixel electrodes included in the specified set of pixel electrodes are arranged in the first direction, the application is performed as compared with the correction performed when the two pixel electrodes are arranged in the second direction. Correcting the input image signal so that the amount of decrease in the voltage difference is reduced,
Liquid crystal display device. An element substrate provided with a plurality of pixel electrodes arranged in a first direction and a second direction intersecting the first direction;
A counter substrate provided with a common electrode;
A liquid crystal layer sandwiched between the element substrate and the counter substrate;
A first light-shielding film extending in the first direction along the side of the pixel electrode; and a second light-shielding film extending in the second direction along the side of the pixel electrode;
And the width of the first light shielding film is narrower than the width of the second light shielding film,
LCD panel,
A signal processing unit for applying a voltage to the plurality of pixel electrodes based on an input image signal;
With
The signal processing unit
As the input image signal,
Among the plurality of pixel electrodes, the pixel corresponding to the first pixel electrode is displayed at the first gradation level, and the pixels corresponding to the other pixel electrodes are the second smaller than the first gradation level. Image signal to be displayed at the gradation level,
Or
Among the plurality of pixel electrodes, the pixel corresponding to the first pixel electrode is displayed at the third gradation level, and the pixels corresponding to the other pixel electrodes are the fourth larger than the third gradation level. Image signal to be displayed at the gradation level,
Is entered,
A first applied voltage difference that is a difference in applied voltage between the first pixel electrode and a second pixel electrode arranged on the side where the reverse tilt domain is likely to occur in the first direction with respect to the first pixel electrode;
A second applied voltage difference that is a difference in applied voltage between the first pixel electrode and a third pixel electrode arranged on the side where the reverse tilt domain is unlikely to occur in the first direction with respect to the first pixel electrode;
A third applied voltage difference that is a difference in applied voltage between the first pixel electrode and a fourth pixel electrode arranged on the side where the reverse tilt domain is likely to occur in the second direction with respect to the first pixel electrode; and
A fourth applied voltage difference that is a difference in applied voltage between the first pixel electrode and a fifth pixel electrode arranged on the side where the reverse tilt domain is unlikely to occur in the second direction with respect to the first pixel electrode;
about,
The first applied voltage difference is smaller than the second applied voltage difference,
The third applied voltage difference is smaller than the fourth applied voltage difference, and
In order for the third applied voltage difference to be smaller than the first applied voltage difference,
Correcting the input image signal and applying a voltage to the plurality of pixel electrodes;
Liquid crystal display device. An element substrate provided with a plurality of pixel electrodes arranged in a first direction and a second direction intersecting the first direction;
A counter substrate provided with a common electrode;
A liquid crystal layer sandwiched between the element substrate and the counter substrate;
A first light-shielding film extending in the first direction along the side of the pixel electrode; and a second light-shielding film extending in the second direction along the side of the pixel electrode;
And the width of the first light shielding film is narrower than the width of the second light shielding film,
LCD panel,
A signal processing unit for applying a voltage to the plurality of pixel electrodes based on an input image signal;
With
The signal processing unit
As the input image signal,
Among the plurality of pixel electrodes, the pixel corresponding to the first pixel electrode is displayed at the first gradation level, and the pixels corresponding to the other pixel electrodes are the second smaller than the first gradation level. Image signal to be displayed at the gradation level,
Or
Among the plurality of pixel electrodes, the pixel corresponding to the first pixel electrode is displayed at the third gradation level, and the pixels corresponding to the other pixel electrodes are the fourth larger than the third gradation level. Image signal to be displayed at the gradation level,
Is entered,
A difference in transmittance between a pixel corresponding to the first pixel electrode and a pixel corresponding to the second pixel electrode arranged on the side where the reverse tilt domain is likely to occur in the first direction. 1 transmittance difference,
The difference in transmittance between the pixel corresponding to the first pixel electrode and the pixel corresponding to the third pixel electrode arranged on the side where the reverse tilt domain hardly occurs in the first direction. 2 transmittance difference,
The difference in transmittance between the pixel corresponding to the first pixel electrode and the pixel corresponding to the fourth pixel electrode arranged on the side where the reverse tilt domain is likely to occur in the second direction. 3 transmittance difference, and
The difference in transmittance between the pixel corresponding to the first pixel electrode and the pixel corresponding to the fifth pixel electrode arranged on the side where the reverse tilt domain hardly occurs in the second direction. 4 transmittance difference,
about,
The first transmittance difference is smaller than the second transmittance difference,
The third transmittance difference is smaller than the fourth transmittance difference, and
In order to reduce the third transmittance difference compared to the first transmittance difference,
Correcting the input image signal and applying a voltage to the plurality of pixel electrodes;
Liquid crystal display device. The liquid crystal display device according to claim 1,
Electronic equipment comprising.

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