Liquid crystal display device

Abstract

Disclosed is a liquid crystal display device including an illuminator and a liquid crystal display. The illuminator includes a first illumination region having a first illuminance and a second illumination region having a second, lower illuminance. The liquid crystal display includes a first region illuminated by a first illumination region and a second region illuminated by a second illumination region. The pixels in the second region include a color filter including a first portion having a first transmittance and a second portion having a higher second transmittance. The pixels in the first region include a color filter including only a first portion, or include a color filter including a first portion and a second portion, and a ratio of the second portion to the first portion and the second portion in the pixels in the second region is greater than a ratio of the second portion to the first portion and the second portion in the pixels in the first region.

Description

[0001] Cross - reference to related applications

[0002] This application claims priority to Japanese Patent Application No. 2023 - 222664 filed on December 28, 2023 and Japanese Patent Application No. 2024 - 155370 filed on September 9, 2024, the entire disclosures of which are incorporated herein by reference. Technical field

[0003] This application generally relates to liquid crystal display devices. Background art

[0004] In the related art, a liquid crystal display device includes a liquid crystal display panel and a backlight that is separately used as an illumination device. When there is an inconsistency in illuminance in the illumination device that supplies light to the display panel, a problem of reduced display uniformity of the liquid crystal display device occurs (for example, see International Publication No. WO2011 / 033896).

[0005] In addition, a feature called local dimming is known, in which the brightness of the backlight is controlled by area units according to the brightness of the screen to be displayed to achieve a high contrast in the liquid crystal display device.

[0006] In the case of local dimming, in the divided areas, light - emitting elements are not provided in the outermost peripheral area. Therefore, the amount of light supplied to it is less than that in the areas other than the outermost periphery, and the illuminance of the outermost peripheral area decreases. This causes a problem of reduced in - plane illuminance uniformity in the display area of the liquid crystal display device.

[0007] Therefore, it is necessary to suppress the reduction of illuminance uniformity in the liquid crystal display device.

[0008] This disclosure is made in view of the above - mentioned circumstances, and an object of this disclosure is to provide a liquid crystal display device capable of suppressing the reduction of illuminance uniformity. Summary of the invention

[0009] To achieve the above object, a liquid crystal display device according to a first embodiment of the present disclosure includes:

[0010] An illuminator including a first illumination area having a first illuminance and a second illumination area having a second illuminance lower than the first illuminance; and

[0011] A liquid crystal display including a first area illuminated by the first illumination area and a second area illuminated by the second illumination area, wherein

[0012] Pixels provided in the second area of the liquid crystal display include a color filter including a first part having a first transmittance and a second part having a second transmittance higher than the first transmittance, and

[0013] i) The pixels provided in the first region include a color filter that only includes a first portion having a first transmittance, or

[0014] ii) The pixels provided in the first region include a color filter that includes a first portion having a first transmittance and a second portion having a second transmittance, wherein the ratio of the second portion in the pixels provided in the second region of the liquid crystal display device to the ratio occupied by the first portion and the second portion is greater than the ratio of the second portion in the pixels provided in the first region to the ratio occupied by the first portion and the second portion.

[0015] It should be understood that the above general description and the following detailed description are both exemplary and explanatory, and are not restrictive of the present disclosure.

[0016] According to the present disclosure, a liquid crystal display device capable of suppressing a decrease in illuminance uniformity can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present application can be more fully understood when the following detailed description is considered in conjunction with the following drawings, in which:

[0018] Figure 1 is a schematic diagram showing a liquid crystal display device according to Embodiment 1;

[0019] Figure 2 is a cross-sectional view taken along line II-II shown in Figure 1 ;

[0020] Figure 3 is a plan view showing a backlight according to Embodiment 1;

[0021] Figure 4 In, A is a diagram for explaining an illumination area;

[0022] Figure 4 In, B is a diagram showing the illuminance on line B-B shown in A in Figure 4 ;

[0023] Figure 5 is a diagram for explaining a display area;

[0024] Figure 6 In, A is a plan view showing a pixel PX;

[0025] Figure 6 In, B is a plan view showing a pixel PX1;

[0026] Figure 6 In, C is a plan view showing a pixel PX2;

[0027] Figure 6 In, D is a plan view showing a pixel PX3;

[0028] Figure 6 Among them, E is a plan view showing pixel PX4;

[0029] Figure 7 Among them, A is along Figure 6 Cross-sectional view taken along line VIIA-VIIA shown in A among them;

[0030] Figure 7 Among them, B is along Figure 6 Cross-sectional view taken along line VIIB-VIIB shown in B among them;

[0031] Figure 7 Among them, C is along Figure 6 Cross-sectional view taken along line VIIC-VIIC shown in C among them;

[0032] Figure 7 Among them, D is along Figure 6 Cross-sectional view taken along line VIID-VIID shown in D among them;

[0033] Figure 7 Among them, E is along Figure 6 Cross-sectional view taken along line VIIE-VIIE shown in E among them;

[0034] Figure 8 Among them, A is a plan view showing pixel PX1 according to Embodiment 2;

[0035] Figure 8 Among them, B is a plan view showing pixel PX2 according to Embodiment 2;

[0036] Figure 8 Among them, C is a plan view showing pixel PX3 according to Embodiment 2;

[0037] Figure 9 It is a diagram for explaining the effects of Embodiment 2;

[0038] Figure 10 Among them, A is a plan view showing pixel PX1 according to Embodiment 3;

[0039] Figure 10 Among them, B is a plan view showing pixel PX2 according to Embodiment 3;

[0040] Figure 10 Among them, C is a plan view showing pixel PX3 according to Embodiment 3;

[0041] Figure 11 Among them, A is a cross-sectional view showing pixel PX according to Embodiment 4;

[0042] Figure 11 Among them, B is a cross-sectional view showing pixel PX1 according to Embodiment 4;

[0043] Figure 11 Figure C is a cross-sectional view showing pixel PX2 according to Embodiment 4;

[0044] Figure 11 Figure D is a cross-sectional view showing pixel PX3 according to Embodiment 4;

[0045] Figure 11 Figure E is a cross-sectional view showing pixel PX4 according to Embodiment 4;

[0046] Figure 12 Figure A is a cross-sectional view showing pixel PX according to Embodiment 5;

[0047] Figure 12 Figure B is a cross-sectional view showing pixel PX1 according to Embodiment 5;

[0048] Figure 12 Figure C is a cross-sectional view showing pixel PX2 according to Embodiment 5;

[0049] Figure 12 Figure D is a cross-sectional view showing pixel PX3 according to Embodiment 5;

[0050] Figure 12 Figure E is a cross-sectional view showing pixel PX4 according to Embodiment 5;

[0051] Figure 13 Figure A is a plan view showing pixel PX according to Embodiment 6;

[0052] Figure 13 Figure B is a plan view showing pixel PX1 according to Embodiment 6;

[0053] Figure 13 Figure C is a plan view showing pixel PX2 according to Embodiment 6;

[0054] Figure 13 Figure D is a plan view showing pixel PX3 according to Embodiment 6;

[0055] Figure 13 Figure E is a plan view showing pixel PX4 according to Embodiment 6;

[0056] Figure 14 Figure A is along Figure 13 a cross-sectional view taken along line XIVa-XIVa shown in Figure A;

[0057] Figure 14 Figure B is along Figure 13 a cross-sectional view taken along line XIVb-XIVb shown in Figure A;

[0058] Figure 14 Figure C is along Figure 13Cross-sectional view taken along line XIVc-XIVc as shown in A;

[0059] Figure 14 D in is along Figure 13 Cross-sectional view taken along line XIVd-XIVd as shown in B;

[0060] Figure 14 E in is along Figure 13 Cross-sectional view taken along line XIVe-XIVe as shown in B;

[0061] Figure 14 F in is along Figure 13 Cross-sectional view taken along line XIVf-XIVf as shown in B;

[0062] Figure 14 G in is along Figure 13 Cross-sectional view taken along line XIVg-XIVg as shown in C;

[0063] Figure 14 H in is along Figure 13 Cross-sectional view taken along line XIVh-XIVh as shown in C;

[0064] Figure 14 I in is along Figure 13 Cross-sectional view taken along line XIVi-XIVi as shown in C;

[0065] Figure 15 J in is along Figure 13 Cross-sectional view taken along line XVj-XVj as shown in D;

[0066] Figure 15 K in is along Figure 13 Cross-sectional view taken along line XVk-XVk as shown in D;

[0067] Figure 15 L in is along Figure 13 Cross-sectional view taken along line XVl-XVl as shown in D;

[0068] Figure 15 M in is along Figure 13 Cross-sectional view taken along line XVm-XVm as shown in E;

[0069] Figure 15 N in is along Figure 13 Cross-sectional view taken along line XVn-XVn as shown in E;

[0070] Figure 15 O in is along Figure 13 Cross-sectional view taken along line XVo-XVo as shown in E;

[0071] Figure 16 In A is a plan view showing the pixel PX according to Embodiment 7;

[0072] Figure 16 In B is a plan view showing the pixel PX1 according to Embodiment 7;

[0073] Figure 16 In C is a plan view showing the pixel PX2 according to Embodiment 7;

[0074] Figure 16 In D is a plan view showing the pixel PX3 according to Embodiment 7;

[0075] Figure 16 In E is a plan view showing the pixel PX4 according to Embodiment 7;

[0076] Figure 17 In A is along Figure 16 a cross-sectional view taken along the line XVIIa-XVIIa shown in A;

[0077] Figure 17 In B is along Figure 16 a cross-sectional view taken along the line XVIIb-XVIIb shown in A;

[0078] Figure 17 In C is along Figure 16 a cross-sectional view taken along the line XVIIc-XVIIc shown in A;

[0079] Figure 17 In D is along Figure 16 a cross-sectional view taken along the line XVIId-XVIId shown in B;

[0080] Figure 17 In E is along Figure 16 a cross-sectional view taken along the line XVIIe-XVIIe shown in B;

[0081] Figure 17 In F is along Figure 16 a cross-sectional view taken along the line XVIIf-XVIIf shown in B;

[0082] Figure 17 In G is along Figure 16 a cross-sectional view taken along the line XVIIg-XVIIg shown in C;

[0083] Figure 17 In H is along Figure 16 a cross-sectional view taken along the line XVIIh-XVIIh shown in C;

[0084] Figure 17 In I is alongFigure 16 Cross-sectional view taken along line XVIIi-XVIIi shown in C;

[0085] Figure 18 In J is along Figure 16 Cross-sectional view taken along line XVIIIj-XVIIIj shown in D;

[0086] Figure 18 In K is along Figure 16 Cross-sectional view taken along line XVIIIk-XVIIIk shown in D;

[0087] Figure 18 In L is along Figure 16 Cross-sectional view taken along line XVIIIl-XVIIIl shown in D;

[0088] Figure 18 In M is along Figure 16 Cross-sectional view taken along line XVIIIm-XVIIIm shown in E;

[0089] Figure 18 In N is along Figure 16 Cross-sectional view taken along line XVIIIn-XVIIIn shown in E; and

[0090] Figure 18 In O is along Figure 16 Cross-sectional view taken along line XVIIIIo-XVIIIIo shown in E. Detailed implementation mode

[0091] Hereinafter, a liquid crystal display device according to various embodiments is described with reference to the accompanying drawings.

[0092] Embodiment 1

[0093] As Figure 1 and Figure 2 shown, the liquid crystal display device 10 according to this embodiment includes a liquid crystal display panel (liquid crystal display) 100, a backlight (illuminator) 200, and a controller 300. The liquid crystal display panel 100 displays characters and / or images. As Figure 2 shown, the backlight 200 is disposed overlapping the liquid crystal display panel 100 and emits light on the liquid crystal display panel 100. The controller 300 controls the display of the liquid crystal display panel 100 and the illuminance of the backlight 200.

[0094] In one example, the liquid crystal display panel 100 is implemented as a horizontal electric field type color liquid crystal display panel of an active matrix driven by thin film transistors (TFTs). As Figure 1As shown, the liquid crystal display panel 100 includes a display area 101 in which pixels including three sub-pixels, namely red (R), green (G), and blue (B), are arranged in a matrix; and a frame area 102 in which wirings, driving circuits, etc. are provided. Here, the frame area 102 surrounds the display area 101. The display area 101 is an area capable of displaying characters, images, etc., and the frame area 102 is an area not capable of displaying characters, images, etc.

[0095] The backlight 200 of this embodiment is implemented as a local dimming lamp, and as Figure 3 shown, includes a plurality of emission areas 200a. The illumination area 201 of the backlight 200 is an area including a plurality of emission areas 200a and is an area for illuminating the liquid crystal display panel 100. The backlight 200 includes white light-emitting diode (LED) elements, a reflector, a diffuser, an illuminating circuit, etc. (all not shown in the drawings). In the backlight 200 of this embodiment, in one example, one or more of the white LED elements are provided in each of the emission areas 200a.

[0096] Figure 4 FIG. A shows the illumination area 201 of the backlight 200. Figure 4 FIG. A corresponds to a plan view of the backlight 200 observed from the user side. Figure 4 FIG. B shows Figure 4 a graph of the illuminance on line B-B shown in FIG. A. As Figure 3 shown, the backlight 200 of this embodiment includes a plurality of emission areas 200a. Therefore, as Figure 4 shown in FIG. B, although the central illumination area 210 of the illumination area 201 has substantially the same illuminance, the illuminance decreases as the distance from the central illumination area 210 to the periphery increases. In one example, the decrease in illuminance is from 20% to 30%.

[0097] Based on Figure 4 the illuminance distribution in FIG. B, the illumination area is set according to the degree of decrease in illuminance starting from the position where the illuminance begins to decrease compared to the central illumination area 210. Specifically, as Figure 4As shown in A, the region where the illuminance starts to decrease and the illuminance is lower than that of the central illumination region 210 is set as the first illumination region 211. In addition, the region where the illuminance is lower than that of the first illumination region 211 is set as the second illumination region 212. Similarly, the region where the illuminance is lower than that of the second illumination region 212 is set as the third illumination region 213, and the region where the illuminance is lower than that of the third illumination region 213 is set as the fourth illumination region 214. In this embodiment, in the backlight 200, the illuminance gradually decreases from the center to the periphery. Therefore, the first illumination region 211 surrounds the central illumination region 210, and the second illumination region 212 surrounds the first illumination region 211. In addition, the third illumination region 213 surrounds the second illumination region 212, and the fourth illumination region 214 surrounds the third illumination region 213. In the first illumination region 211 to the fourth illumination region 214, the illuminance does not need to be uniform in each plane, and it is sufficient within a specific numerical range.

[0098] The controller 300 includes a central processing unit (CPU), a memory, etc., and controls the display of the liquid crystal display panel 100 and the illuminance of the backlight 200. In one example, the CPU executes a program stored in the memory to implement the functions of the controller 300.

[0099] Next, Figure 5 The display area 101 of the liquid crystal display panel 100 is shown. In this embodiment, as will be described in detail later, the transmittances of the color filters in the sub-pixels of the pixels PX - PX4 provided in the display area 101 are different from each other. The transmittance of the color filter is determined according to the illuminance of the illumination region 201 of the backlight 200 that illuminates the display area 101.

[0100] First, the central region 110 of the display area 101 is illuminated by the central illumination region 210 of the illumination region 201. The first region 111 of the display area 101 is illuminated by the first illumination region 211, and the second region 112 of the display area 101 is illuminated by the second illumination region 212. Similarly, the third region 113 of the display area 101 is illuminated by the third illumination region 213, and the fourth region 114 of the display area 101 is illuminated by the fourth illumination region 214.

[0101] As described above, in the backlight 200, the illuminance decreases in the order of the central illumination area 210, the first illumination area 211, the second illumination area 212, the third illumination area 213, and the fourth illumination area 214. Therefore, in the liquid crystal display panel 100, the transmittance of the light from the backlight 200 increases in the order of the central area 110, the first area 111, the second area 112, the third area 113, and the fourth area 114. In one example, the illuminance of the backlight 200 decreases by 20% to 30% at the peripheral portion compared to the central portion. Preferably, by adjusting the transmittance of the liquid crystal display panel 100, the difference in the surface illuminance of the liquid crystal display device 10 is set to 15% or less.

[0102] Next, Figure 6 A in shows a pixel PX provided in the central area 110. Figure 6 B in shows a pixel PX1 provided in the first area 111, Figure 6 C in shows a pixel PX2 provided in the second area 112, Figure 6 D in shows a pixel PX3 provided in the third area 113, and Figure 6 E in shows a pixel PX4 provided in the fourth area 114. Figure 7 A in is a cross-sectional view taken along the Figure 6 line VIIA-VIIA shown in A in. Figure 7 B in is a cross-sectional view taken along the Figure 6 line VIIB-VIIB shown in B in, Figure 7 C in is a cross-sectional view taken along the Figure 6 line VIIC-VIIC shown in C in, Figure 7 D in is a cross-sectional view taken along the Figure 6 line VIID-VIID shown in D in, and Figure 7 E in is a cross-sectional view taken along the Figure 6 line VIIE-VIIE shown in E in. In the present embodiment, an example of a configuration is described in which a high transmittance area is provided only in the G filter among the RGB color filters.

[0103] First, as Figure 7 shown in A- Figure 7 E in, the liquid crystal display panel 100 includes an active matrix substrate 103, a counter substrate 104, and liquid crystal LC. The counter substrate 104 is attached to the active matrix substrate 103 by a sealing material (not shown in the figure). In addition, the liquid crystal display panel 100 includes a polarizing plate (not shown in the figure) provided on the lower surface of the active matrix substrate 103 and a polarizing plate (not shown in the figure) provided on the upper surface of the counter substrate 104. In one example, the counter substrate 104 is implemented as a glass substrate. As Figure 4As shown, a color filter 120, an outer coating film 106, and an alignment film (none of which are shown in the figures) are provided on the surface of the counter substrate 104 facing the active matrix substrate 103. In addition, in the present embodiment, the outer coating film 106 is formed to be relatively thick. Therefore, disclinations occurring within the pixel at the step difference generated by the second portion 122 of the color filter 120 are prevented.

[0104] In one example, the active matrix substrate 103 is implemented as a glass substrate. A pixel electrode, a gate line, a data line, a switching element, etc. (none of which are shown in the figures) are provided on the surface of the active matrix substrate 103 facing the counter substrate 104. Note that in Figure 7 A - Figure 7 In E, for ease of understanding, these switching elements, pixel electrodes, etc. are collectively shown as an electrode formation layer 107.

[0105] As Figure 6 shown in A, the pixel PX provided in the central region 110 includes a red sub - pixel SPR, a green sub - pixel SPG, and a blue sub - pixel SPB. In the present embodiment, a high - transmittance region is provided in the color filter 120 of the green sub - pixel SPG. In addition, within the sub - pixel SPG, the displayable region is the pixel region PR defined by the black matrix BM.

[0106] As Figure 6 shown in A, in the pixel PX, the color filter 120 in the pixel region PR only includes a first portion 121 having a reference thickness and a first transmittance. In other words, when observing the pixel PX planarly from the user side, the ratio of the area occupied by the second portion 122 in the pixel region PR is zero. In addition, as Figure 7 shown in A, the color filter only includes the first portion 121.

[0107] In the pixel PX1 provided in the first region 111 surrounding the central region 110, the color filter 120 includes a first portion 121 having a first transmittance and a second portion 122 having a second transmittance higher than the first transmittance. As Figure 6 shown in B, the pixel region PR includes the first portion 121 and the second portion 122. When observing the pixel PX1 planarly, the ratio of the area of the second portion 122 to the combined area of the first portion 121 and the second portion 122 is greater than that of the pixel PX. Therefore, the transmittance of the color filter 120 of the pixel PX1 is higher than that of the color filter 120 of the pixel PX. As Figure 7 shown in B, in the pixel PX1, the thickness of the second portion 122 of the color filter 120 is formed thinner than the thickness of the first portion 121.

[0108] In pixels PX2 disposed in a second region 112 surrounding a first region 111, a color filter 120 includes a first portion 121 having a first transmittance and a second portion 122 having a second transmittance higher than the first transmittance. As Figure 6 shown in C, the pixel region PR of the pixel PX2 includes more of the second portion 122 than the pixel PX1. Accordingly, when the pixel PX2 is viewed flat, the ratio of the area of the second portion 122 to the combined area of the first portion 121 and the second portion 122 is greater than that in the pixel PX1. Accordingly, the transmittance of the color filter 120 of the pixel PX2 is higher than the transmittance of the color filter 120 of the pixel PX1. As Figure 7 shown in C, in the pixel PX2, the thickness of the second portion 122 of the color filter 120 is formed thinner than the thickness of the first portion 121.

[0109] As Figure 6 shown in D, in pixels PX3 disposed in a third region 113 surrounding the second region 112, a color filter 120 includes a first portion 121 having a first transmittance and a second portion 122 having a second transmittance higher than the first transmittance. As Figure 6 shown in D, when the pixel PX3 is viewed flat, the ratio of the area of the second portion 122 to the combined area of the first portion 121 and the second portion 122 is greater than that in the pixel PX2. Accordingly, the transmittance of the color filter 120 of the pixel PX3 is higher than the transmittance of the color filter 120 of the pixel PX2. As Figure 7 shown in D, also in the pixel PX3, the thickness of the second portion 122 of the color filter 120 is formed thinner than the thickness of the first portion 121.

[0110] Note that, as Figure 7 shown in B- Figure 7 shown in D, the thickness difference of the color filter 120 can be fabricated by using a halftone mask.

[0111] As Figure 6 shown in E and Figure 7 shown in E, in pixels PX4 disposed in a fourth region 114 surrounding the third region 113, the color filter 120 includes only the second portion 122 having the second transmittance. In other words, when the pixel PX4 is viewed flat from the user side, the ratio of the area occupied by the second portion 122 in the pixel region PR is 1, and the transmittance of the color filter 120 of the pixel PX4 is higher than the transmittance of the color filter 120 of the pixel PX3.

[0112] In the present embodiment, in the pixels PX-PX4, the transmittance can be increased from the pixel PX to the pixel PX4 by sequentially increasing the ratio of the area of the second portion 122 having a transmittance higher than the transmittance of the first portion 121 to the area when the pixel region PR is viewed flat.

[0113] In the liquid crystal display device 10 of the present embodiment, the second part 122 having a high transmittance to the light of the backlight 200 is provided in the pixels PX1 to PX4 provided in the first region 111 to the fourth region 114 provided in the liquid crystal display panel 100. Therefore, the reduction in the illuminance of the backlight 200 is compensated for by the liquid crystal display panel 100, and as a result, the in-plane illuminance uniformity on the surface of the liquid crystal display device 10 can be improved. In addition, by gradually increasing the ratio of the high transmittance second part 122 from the first region 111 to the fourth region 114 according to the reduction in illuminance, the reduction in the illuminance on the surface of the liquid crystal display device 10 can be suppressed, and the in-plane uniformity can be improved.

[0114] In addition, in the liquid crystal display device 10 of the present embodiment, since the transmittance of the color filter is increased, there is no need to increase the brightness of the backlight 200 to increase the illuminance, and the power consumption does not increase.

[0115] In addition, in the liquid crystal display device 10 of the present embodiment, the reduction in the illuminance at the periphery of the display region 101 can be suppressed. For example, in the case where a conventional liquid crystal display device is used as a tiled display, there is a problem that when a low illuminance region is located at the periphery of each liquid crystal display device, the seams between the displays are obvious. However, with the liquid crystal display device 10 of the present embodiment, the reduction in the illuminance at the periphery of the display region 101 can be suppressed, and therefore, an effect can be obtained that can make the seams between the displays less obvious.

[0116] Note that in the present embodiment, an example of a configuration is described in which the high transmittance second part is provided in green among red, green, and blue, but the color in which the high transmittance second part is provided is not limited to green. It is sufficient that the second part is provided in at least one of the red, green, and blue color filters. That is, a configuration in which the second part is provided only in one of the red, green, and blue color filters is possible, a configuration in which the second part is provided in two of the color filters is also possible, and a configuration in which the second part is provided in all three of the color filters is also possible. However, a change in the thickness of the color filter also causes a change in chromaticity. Preferably, this change in chromaticity is within a range that is difficult for the user to visually recognize. Although there are differences depending on the materials used, based on the chromaticity change caused by the change in film thickness, green is often the least visually recognizable, followed by red. Therefore, it is preferable that the second part is provided in the green color filter, and next preferably, the second part is provided in the red color filter.

[0117] In this embodiment, an example of a configuration is described in which the planar shape of the high transmittance second portion 122 is square, but the planar shape of the second portion 112 can be set as needed. For example, the planar shape of the second portion 122 can be a polygon, a circle, an ellipse, etc.

[0118] Embodiment 2

[0119] Hereinafter, a liquid crystal display device 10 according to Embodiment 2 is described. The feature of this embodiment is that the arrangement of the first portion 121 and the second portion 122 of the color filter 120 is different from that of Embodiment 1. Features common to Embodiment 1 are denoted by the same reference numerals and their detailed description is omitted.

[0120] Figure 8 in A- Figure 8 C in shows pixels PX1 - PX3 according to this embodiment. Figure 8 in A- Figure 8 C in correspondingly corresponds to Figure 6 in B- Figure 6 in D of Embodiment 1. Figure 8 in A- Figure 8 The pixels PX1 - PX3 in C are correspondingly arranged in the first region 111, the second region 112, and the third region 113. Note that the configurations of pixel PX and pixel PX4 are the same as those in Embodiment 1, and thus their description is omitted.

[0121] In this embodiment, the second portion 122 is arranged to extend from the center of the pixel region PR to both vertical ends. As Figure 8 shown in A, in the color filter 120 of pixel PX1, the second portion 112 having a high transmittance is arranged in the central portion of pixel PX1, and the first portion 121 having a low transmittance is arranged above and below the second portion 122. In particular, the first portion 121 and the second portion 122 are arranged symmetrically with respect to Figure 8 the horizontal center line of the pixel region PR shown in A. By arranging in this way, for the upper half region and the lower half region of the pixel region PR, the ratio of the area of the second portion 122 to the total area of the first portion 121 and the second portion 22 can be made the same. Further, as Figure 8 shown in B- Figure 8 C, when the ratio of the second portion 112 is increased, the area of the second portion 122 arranged in the central portions of pixels PX2 and PX3 is increased.

[0122] Figure 9 is a diagram for explaining the effect of this embodiment. As Figure 9As shown, the electrode is bent at the center portion of the pixel, thereby providing a multi-domain structure for the pixel. In this case, the ratio of the second portion 122 to the first portion 121 and the second portion 122 in the upper domain is made the same as the ratio of the second portion 122 to the first portion 121 and the second portion 122 in the lower domain.

[0123] As is well known, when observing liquid crystal from the long axis direction, the light on the short wavelength side appears stronger, and when observing from the short axis direction, the light on the long wavelength side appears stronger. When Figure 9 the first portion 121 and the second portion 122 are arranged as shown, the transmittance of the upper domain and the lower domain can be made equal. Therefore, there will be no difference between the color observed from the A direction and the color observed from the B direction. As a result, the occurrence of color difference caused by the high transmittance second portion 122 in the pixel can be prevented.

[0124] In the case of a multi-domain structure, it is particularly advantageous to make the ratio of the second portion 122 to the first portion 121 and the second portion 112 the same in each domain.

[0125] Embodiment 3

[0126] Hereinafter, the liquid crystal display device 10 according to Embodiment 3 will be described. The feature of this embodiment is that the arrangement of the first portion 121 and the second portion 122 of the color filter 120 is different from that in Embodiments 1 and 2. Features common to Embodiments 1 and 2 are denoted by the same reference numerals, and their detailed descriptions are omitted.

[0127] Figure 10 in A- Figure 10 Pixels PX1 - PX3 according to this embodiment are shown in C. Figure 10 in A- Figure 10 in C correspondingly corresponds to Figure 6 in B- Figure 6 in D of Embodiment 1. Figure 10 in A- Figure 10 Pixels PX1 - PX3 in C are correspondingly arranged in the first region 111, the second region 112, and the third region 113. Note that the configurations of pixel PX and pixel PX4 are the same as those in Embodiment 1, and thus their descriptions are omitted.

[0128] In this embodiment, as Figure 10 shown in A- Figure 10 in C, a plurality of second portions 122 are arranged in a stripe pattern. This enables the first portion 121 and the second portion 122 to be arranged at a fine pitch. Note that in Figure 10 in A- Figure 10In FIG. C, an example of stripes extending horizontally along the pixels is shown, but stripes extending vertically are acceptable, and stripes extending in the diagonal direction are also acceptable.

[0129] When the distance between the first portion 121 and the second portion 122 of the color filter 120 is large, the illuminance difference can be visually recognized as streak-like non-uniformity. In this case, when the distance between the thin portion and the reference thickness portion of the color resist is large, there is a concern that the illuminance difference can be visually recognized as streak-like non-uniformity. By disposing the second portion 122 at a plurality of positions as in the present embodiment, the distance between the first portion 121 and the second portion 122 becomes finer, which makes it possible to prevent this streak-like non-uniformity from being visually recognized.

[0130] Embodiment 4

[0131] Hereinafter, the liquid crystal display device 10 according to Embodiment 4 is described. In the above embodiment, the thicknesses of the first portion 121 and the second portion 122 of the color filter 120 are changed to change the transmittance. However, in the present embodiment, the materials for the first portion and the second portion are changed to change the transmittance. Features common to the above embodiment are denoted by the same reference numerals, and their detailed descriptions are omitted.

[0132] Figure 11 In FIG. A- Figure 11 FIG. E shows the pixels PX - PX4 according to the present embodiment. Figure 11 In FIG. A- Figure 11 FIG. E correspondingly corresponds to the cross-sectional views taken along the respective lines of FIG. A- Figure 6 In FIG. A- Figure 6 FIG. E.

[0133] Figure 11 In FIG. A- Figure 11 The pixels PX - PX4 of FIG. E are correspondingly disposed in the central region 110, the first region 111, the second region 112, the third region 113, and the fourth region 114.

[0134] In the present embodiment, in the pixels PX1 - PX3, each color filter 125 has the same flat shape as that of FIG. B- Figure 6 In FIG. D. Further, as shown in FIG. B- Figure 6 FIG. D, the color filter 125 includes a first portion 126 having a first transmittance and a second portion 127 having a second transmittance higher than the first transmittance. In the present embodiment, the second portion 127 is formed of a material having a higher light transmittance than the first portion 126 at the same thickness. As a result, as shown in FIG. B- Figure 11 In FIG. D. Figure 11 FIG. D shows that the second portion 127 is formed of a material having a higher light transmittance than the first portion 126 at the same thickness. As a result, as shown in FIG. B- Figure 11 In FIG. D. Figure 11As shown in Fig. D, the first part 126 and the second part 127 of the color filter 125 are formed to have the same thickness.

[0135] When changing the materials of the first part 126 and the second part 127 as in this embodiment, two types of resists need to be prepared to form the color filter, and the color filter must be formed using different processes. However, since the thicknesses are the same, the advantage is that the need for using a halftone mask is eliminated.

[0136] In addition, since no step difference is formed in the color filter 125 of the pixels PX1 - PX3, the advantage is that the possibility of disclination can be reduced.

[0137] Embodiment 5

[0138] Hereinafter, the liquid crystal display device 10 according to Embodiment 5 is described. In the above Embodiment 1, the outer coating film 106 is formed relatively thick with respect to the color filter 120 to prevent the formation of a step difference of the outer coating film 106. However, in this embodiment, the outer coating film 108 includes a step difference, and the cell gap is widened in the region where the second part 122 is provided. Features common to the above embodiments are denoted by the same reference numerals, and their detailed descriptions are omitted.

[0139] Figure 12 Fig. A - Figure 12 Fig. E shows the pixels PX - PX4 according to this embodiment. Figure 12 Fig. A - Figure 12 Fig. E correspondingly corresponds to the cross-sectional views taken along each line of Fig. A - Figure 6 Fig. A - Figure 6 Fig. E in Embodiment 1.

[0140] Figure 12 Fig. A - Figure 12 The pixels PX - PX4 in Fig. E are correspondingly arranged in the central region 110, the first region 111, the second region 112, the third region 113, and the fourth region 114.

[0141] In this embodiment, in the pixels PX1 - PX3, each color filter 120 has the same flat shape as that in Fig. B - Figure 6 Fig. D in Embodiment 1. In addition, as in Figure 6 Fig. B - Figure 12 Fig. D in Embodiment 1. Figure 12As shown in FIG. D, the color filter 120 includes a first portion 121 having a first transmittance and a second portion 122 having a second transmittance higher than the first transmittance. In the present embodiment, as in Embodiment 1, the thickness formed by the second portion 122 is less than the thickness of the first portion 121. Due to the thickness difference between the first portion 121 and the second portion 122, a step difference is formed in the outer coating film 108. The cell gap in the region where the first portion 121 is provided is G1, the cell gap in the region where the second portion 122 is provided is G2, and G2 is greater than G1 (G2 > G1). In addition, the cell gap in the pixel PX4 is G2, and it is all the second portion 122.

[0142] In the region where the cell gap has increased, the transmittance of light tends to increase. Therefore, by increasing the cell gap in the region where the second portion 122 is provided, the transmittance can be further improved.

[0143] Therefore, in the liquid crystal display device of the present embodiment, in addition, the transmittance in the pixels PX1 - PX4 can be increased.

[0144] Embodiment 6

[0145] Hereinafter, the liquid crystal display device 10 according to Embodiment 6 is described. In the above Embodiment 1, an example in which a high transmittance second portion is provided in a color filter configured in one of red, green, and blue is described. However, in the present embodiment, the high transmittance second portion is provided in two or more of red, green, and blue, and the area ratio of the second portion in each of the red, green, and blue pixels is changed. Features common to the above embodiments are denoted by the same reference numerals, and their detailed descriptions are omitted.

[0146] Figure 13 In FIG. A - Figure 13 FIG. E shows the pixels PX - PX4 according to the present embodiment. As Figure 13 shown in FIG. A, in the pixel PX, the color filter 120 in the pixel region PR1 of the red sub - pixel SPR, the pixel region PR2 of the green sub - pixel SPG, and the pixel region PR3 of the blue sub - pixel SPB only includes the first portion 121 having a reference thickness and a first transmittance. In other words, when the pixel PX is viewed flatly from the user side, the ratio of the area occupied by the second portion 122 in the pixel regions PR1 - PR3 is zero. Figure 14 FIG. A is a cross - sectional view taken along line XIVa - XIVa, and is Figure 13 the cross - section of the sub - pixel SPR shown in FIG. A. Figure 14 FIG. B is a cross - sectional view taken along line XIVb - XIVb, and is Figure 13 the cross - section of the sub - pixel SPG shown in FIG. A. Figure 14In FIG. C is a cross-sectional view taken along line XIVc-XIVc, and is Figure 13 a cross-section of the sub-pixel SPB shown in FIG. A. As Figure 14 shown in FIG. A- Figure 14 shown in FIG. C, the red, green, and blue color filters only include the first portion 121.

[0147] In pixel PX1, the color filter 120 includes a first portion 121 having a first transmittance and a second portion 122 having a second transmittance higher than the first transmittance. As Figure 13 shown in FIG. B, the pixel regions PR1 and PR2 include the first portion 121 and the second portion 122. Figure 14 In FIG. D is a cross-sectional view taken along line XIVd-XIVd, and is Figure 13 a cross-section of the sub-pixel SPR shown in FIG. B. Figure 14 In FIG. E is a cross-sectional view taken along line XIVe-XIVe, and is Figure 13 a cross-section of the sub-pixel SPG shown in FIG. B. Figure 14 In FIG. F is a cross-sectional view taken along line XIVf-XIVf, and is Figure 13 a cross-section of the sub-pixel SPB shown in FIG. B. As Figure 14 shown in FIG. D- Figure 14 shown in FIG. F, the blue color filter only includes the first portion 121, and the red and green color filters include the first portion 121 and the second portion 122. In pixel PX1, the thickness of the second portion 122 of the color filter 120 is formed thinner than the thickness of the first portion 121. When the pixel PX1 is viewed planar, compared with pixel PX, in the pixel regions PR1 and PR2, the area of the second portion 122 is larger than the combined area of the first portion 121 and the second portion 122. Therefore, the transmittance of the color filter 120 of pixel PX1 is higher than the transmittance of the color filter 120 of pixel PX. Here, the area ratio of the second portion 122 in the pixel region PR1 and the area ratio of the second portion 122 in the pixel region PR2 are not the same, that is, the area ratio of the second portion 122 in the pixel region PR2 is larger. In addition, like pixel PX, the area ratio occupied by the second portion 122 in the pixel region PR3 is zero. Therefore, the area ratio of the second portion 122 in the pixel region PR3 is different from the area ratio of the second portion 122 in the pixel regions PR1 and PR2.

[0148] In pixel PX2, the color filter 120 includes a first portion 121 having a first transmittance and a second portion 122 having a second transmittance higher than the first transmittance. As Figure 13As shown in [C], compared to pixel PX1, pixel regions PR1 and PR2 of pixel PX2 include more of the second portion 122. In addition, compared to pixel PX1, pixel region PR3 includes the second portion 122 in addition to the first portion 121. Therefore, when observing pixel PX2 flatly, the ratio of the area of the second portion 122 to the combined area of the first portion 121 and the second portion 122 is greater than that in pixel PX1. Accordingly, the transmittance of the color filter 120 of pixel PX2 is higher than that of the color filter of pixel PX1. Here, the ratio of the area occupied by the second portion 122 in each of pixel regions PR1, PR2, and PR3 is not the same, that is, the area ratio occupied by the second portion 122 increases in the order of pixel regions PR3, PR1, and PR2. Figure 14 Figure [G] is a cross-sectional view taken along line XIVg-XIVg and is Figure 13 a cross-section of sub-pixel SPR shown in [C]. Figure 14 Figure [H] is a cross-sectional view taken along line XIVh-XIVh and is Figure 13 a cross-section of sub-pixel SPG shown in [C]. Figure 14 Figure [I] is a cross-sectional view taken along line XIVi-XIVi and is Figure 13 a cross-section of sub-pixel SPB shown in [C]. As Figure 14 shown in [G]- Figure 14 [I], the red, green, and blue color filters include the first portion 121 and the second portion 122, and in pixel PX2, the thickness of the second portion 122 of the color filter 120 is formed thinner than the thickness of the first portion 121.

[0149] In addition, as Figure 13 shown in [D], in pixel PX3, the color filter 120 also includes the first portion 121 having a first transmittance and the second portion 122 having a second transmittance higher than the first transmittance. When observing pixel PX3 flatly, the ratio of the area of the second portion 122 to the combined area of the first portion 121 and the second portion 122 is greater than Figure 13 the ratio of pixel PX2 shown in [C]. Accordingly, the transmittance of the color filter 120 of pixel PX3 is higher than that of the color filter 120 of pixel PX2. Here, similar to pixel PX2, the ratio of the area occupied by the second portion 122 in each of pixel regions PR1, PR2, and PR3 is not the same, that is, the area ratio occupied by the second portion 122 increases in the order of pixel regions PR3, PR1, and PR2. Figure 15 Figure [J] is a cross-sectional view taken along line XVj-XVj and is Figure 13 a cross-section of sub-pixel SPR shown in [D]. Figure 15 Figure [K] is a cross-sectional view taken along line XVk-XVk and is Figure 13Cross-section of sub-pixel SPG shown in D. Figure 15 L is a cross-sectional view taken along line XVl-XVl and is Figure 13 the cross-section of sub-pixel SPB shown in D. As Figure 15 J- Figure 15 shown in L, the red, green, and blue color filters include a first part 121 and a second part 122, and also in pixel PX3, the thickness of the second part 122 of the color filter 120 is formed thinner than the thickness of the first part 121.

[0150] In addition, as Figure 13 shown in E, in pixel PX4, in addition to pixel region PR2, in pixel regions PR1 and PR3, the color filter 120 includes a first part 121 having a first transmittance and a second part 122 having a second transmittance higher than the first transmittance. In contrast, pixel region PR2 only includes the second part 122 having the second transmittance. When observing pixel PX4 flatly, compared with Figure 13 pixel PX3 shown in D, in pixel regions PR1 and PR3, the ratio of the area of the second part 122 to the combined area of the first part 121 and the second part 122 is larger. In addition, the area ratio occupied by the second part 122 in pixel region PR2 is 1, and the transmittance of the color filter 120 of pixel PX4 is higher than the transmittance of pixel PX3. Figure 15 M is a cross-sectional view taken along line XVm-XVm and is Figure 13 the cross-section of sub-pixel SPR shown in E. Figure 15 N is a cross-sectional view taken along line XVn-XVn and is Figure 13 the cross-section of sub-pixel SPG shown in E. Figure 15 O is a cross-sectional view taken along line XVo-XVo and is Figure 13 the cross-section of sub-pixel SPB shown in E. As Figure 15 M- Figure 15 shown in O, the red and blue color filters include a first part 121 and a second part 122, the green color filter only includes the second part 122, and also in pixel PX4, the thickness of the second part 122 of the color filter 120 is formed thinner than the thickness of the first part 121.

[0151] In this embodiment, in pixels PX - PX4, the transmittance can be increased from pixel PX to pixel PX4 by sequentially increasing the ratio of the area of the second portion 122 having a transmittance higher than that of the first portion 121 to the area when observing the pixel regions PR1, PR2, and PR3 flatly. Further, in the pixel regions PR1, PR2, and PR3, the area ratio of the second portion 122 varies. Since the high transmittance second portions are provided in the red, green, and blue color filters, the thickness of the color filters changes, and the change in the thickness of the color filters causes a change in chromaticity. Preferably, this change in chromaticity is within a range that is difficult for a user to visually recognize. Based on the chromaticity change caused by the film thickness change, green is often the least visually recognizable, followed by red. Therefore, the ratio of the second portion varies according to the color filter, that is, the change in the ratio of the second portion of the green color filter is the largest, followed by the change in the ratio of the second portion of the red color filter, and the change in the ratio of the second portion of the blue color filter is the smallest. As a result, the transmittance from pixel PX to pixel PX4 can be increased while suppressing the chromaticity change and preventing the chromaticity change from being visually recognized.

[0152] Embodiment 7

[0153] Hereinafter, the liquid crystal display device 10 according to Embodiment 7 is described. In the above Embodiment 6, an example was described in which high transmittance second portions are provided in two or more of red, green, and blue, and the area ratio of the second portion in each of the red, green, and blue pixels varies. However, in this embodiment, high transmittance second portions are provided in two or more of red, green, and blue, and in each of the red, green, and blue pixels, the thickness difference between the reference thickness portion as the first portion and the thin portion as the second portion varies. Features common to the above embodiments are denoted by the same reference numerals, and their detailed descriptions are omitted.

[0154] Figure 16 in A - Figure 16 Figure A in shows pixels PX - PX4 according to this embodiment. As Figure 16 shown in Figure A, in pixel PX, the color filter 120 in the pixel region PR1 of the red sub - pixel SPR, the pixel region PR2 of the green sub - pixel SPG, and the pixel region PR3 of the blue sub - pixel SPB only includes the first portion 121 having a reference thickness and a first transmittance. In other words, when observing pixel PX flatly from the user side, the ratio of the area occupied by the second portion 122 in the pixel regions PR1 - PR3 is zero. Figure 17 Figure A is a cross - sectional view taken along line XVIIa - XVIIa, and is Figure 16 the cross - section of the sub - pixel SPR shown in Figure A. Figure 17In FIG. B, it is a cross-sectional view taken along line XVIIb-XVIIb, and is Figure 16 the cross-section of the sub-pixel SPG shown in FIG. A. Figure 17 In FIG. C, it is a cross-sectional view taken along line XVIIc-XVIIc, and is Figure 16 the cross-section of the sub-pixel SPB shown in FIG. A. As Figure 17 shown in FIG. A- Figure 17 shown in FIG. C, the red, green, and blue color filters only include the first portion 121.

[0155] In the pixel PX1, the color filter 120 includes a first portion 121 having a first transmittance and a second portion 122 having a second transmittance higher than the first transmittance. As Figure 16 shown in FIG. B, the pixel regions PR1, PR2, and PR3 include the first portion 121 and the second portion 122. When the pixel PX1 is viewed planar, the ratio of the area of the second portion 122 to the combined area of the first portion 121 and the second portion 122 is the same in the pixel regions PR1, PR2, and PR3, and is higher than the ratio of the pixel PX. Therefore, the transmittance of the color filter 120 of the pixel PX1 is higher than that of the color filter 120 of the pixel PX. Figure 17 In FIG. D, it is a cross-sectional view taken along line XVIId-XVIId, and is Figure 16 the cross-section of the sub-pixel SPR shown in FIG. B. Figure 17 In FIG. E, it is a cross-sectional view taken along line XVIIe-XVIIe, and is Figure 16 the cross-section of the sub-pixel SPG shown in FIG. B. Figure 17 In FIG. F, it is a cross-sectional view taken along line XVIIf-XVIIf, and is Figure 16 the cross-section of the sub-pixel SPB shown in FIG. B. As Figure 17 shown in FIG. D- Figure 17As shown in FIG. F, the red, green, and blue color filters 120 include a first portion 121 and a second portion 122. In pixel PX1, the thickness of the second portion 122 of the color filter 120 is formed to be thinner than the thickness of the first portion 121. Here, the thickness of the second portion 122 of the green color filter 120 in pixel region PR2 is formed to be thinner than the thickness of the second portion 122 of the red color filter 120 in pixel region PR1 and the thickness of the second portion 122 of the blue color filter 120 in pixel region PR3. Therefore, for the thickness difference between the first portion 121 as the reference thickness portion and the second portion 122 as the thin portion, the thickness difference in the green color filter 120 is greater than the thickness difference in the red and blue color filters 120. By forming the thickness thinly, even if the area is the same, the transmittance increases. As a result, in pixel PX1, the area ratios of the second portions 122 of pixel regions PR1, PR2, and PR3 are the same, but the transmittance of pixel region PR2 is higher than the transmittance of pixel regions PR1 and PR3. As described above, based on the change in film thickness, the chromaticity changes. Green is less likely to be visually recognized. Therefore, even if the thickness difference is large compared to other colors, the change in chromaticity is less likely to be visually recognized by the user.

[0156] In addition, in pixel PX2, the color filter 120 includes a first portion 121 having a first transmittance and a second portion 122 having a second transmittance higher than the first transmittance. As Figure 16 shown in FIG. C, pixel regions PR1, PR2, and PR3 of pixel PX2 include more of the second portion 122 than pixel PX1. Therefore, when observing pixel PX2 planarly, the ratio of the area of the second portion 122 to the combined area of the first portion 121 and the second portion 122 is greater than the ratio in pixel PX1. Therefore, the transmittance of the color filter 120 of pixel PX2 is higher than the transmittance of the color filter 120 of pixel PX1. Here, the ratio of the area occupied by the second portion 122 in each of pixel regions PR1, PR2, and PR3 is the same. Figure 17 FIG. G is a cross-sectional view taken along line XVIIg-XVIIg and is a Figure 16 cross-section of sub-pixel SPR shown in FIG. C. Figure 17 FIG. H is a cross-sectional view taken along line XVIIh-XVIIh and is a Figure 16 cross-section of sub-pixel SPG shown in FIG. C. Figure 17 FIG. I is a cross-sectional view taken along line XVIIi-XVIIi and is a Figure 16 cross-section of sub-pixel SPB shown in FIG. C. As ​ shown in FIG. G- ​As shown in [I], the red, green, and blue color filters 120 include a first part 121 and a second part 122. Similarly, in pixel PX2, the thickness of the second part 122 of the color filter 120 is formed to be thinner than that of the first part 121. In addition, the thickness of the second part 122 of the green color filter 120 is formed to be thinner than that of the second part 122 of the color filters 120 of other colors, and has a higher transmittance.

[0157] As ​ shown in [D], similarly, in pixel PX3, the color filter 120 also includes a first part 121 having a first transmittance and a second part 122 having a second transmittance higher than the first transmittance. When observing pixel PX3 planar, the ratio of the area of the second part 122 to the combined area of the first part 121 and the second part 122 is larger than ​ that of pixel PX2 shown in [C]. Therefore, the transmittance of the color filter 120 of pixel PX3 is higher than that of the color filter 120 of pixel PX2. Here, the ratio of the area occupied by the second part 122 in the pixel regions PR1, PR2, and PR3 is the same. ​ [J] is a cross-sectional view taken along line XVIIIj - XVIIIj and is a ​ cross-section of the sub-pixel SPR shown in [D]. ​ [K] is a cross-sectional view taken along line XVIIIk - XVIIIk and is a ​ cross-sectional view of the sub-pixel SPG shown in [D]. ​ [L] is a cross-sectional view taken along line XVIII1 - XVIIIl and is a ​ cross-sectional view of the sub-pixel SPB shown in [D]. As ​ shown in [J - ​ [L], the red, green, and blue color filters include a first part 121 and a second part 122. Similarly, in pixel PX3, the thickness of the second part 122 of the color filter 120 is formed to be thinner than that of the first part 121. In addition, the thickness of the second part 122 of the green color filter 120 is formed to be thinner than that of the second part 122 of the color filters 120 of other colors, and has a higher transmittance.

[0158] As ​ shown in [E], in pixel PX4, in the pixel regions PR1, PR2, and PR3, the color filter 120 only includes a second part 122 having a second transmittance higher than the first transmittance. When observing pixel PX4 planar, the ratio of the area of the second part 122 to the combined area of the first part 121 and the second part 122 is 1. Therefore, it is larger than the ratio of pixel PX3 shown in ​ [D]. ​In FIG. M, it is a cross-sectional view taken along line XVIII m-XVIII m, and is ​ a cross-section of the sub-pixel SPR shown in FIG. E. ​ In FIG. N, it is a cross-sectional view taken along line XVIII n-XVIII n, and is ​ a cross-section of the sub-pixel SPG shown in FIG. E. ​ In FIG. O, it is a cross-sectional view taken along line XVIII o-XVIII o, and is ​ a cross-section of the sub-pixel SPB shown in FIG. E. As ​ shown in FIG. M- ​ FIG. O, similarly in pixel PX4, the thickness of the second part 122 of the green filter 120 is formed to be thinner than the thickness of the second part 122 of the filters 120 of other colors, and has a higher transmittance.

[0159] In the present embodiment, in pixels PX-PX4, by sequentially increasing the ratio of the area of the second part 122 having a transmittance higher than that of the first part 121 to the area when observing the pixel regions PR1, PR2, and PR3 in a plane, the transmittance can be increased from pixel PX to pixel PX4. In addition, in the pixel regions PR1, PR2, and PR3, the thickness difference between the first part 121 and the second part 122 is variable. Since the second part with a high transmittance is provided in the filters of the red, green, and blue sub-pixels, the thickness of the filter changes, and the change in the filter thickness causes a change in chromaticity. Preferably, this change in chromaticity is within a range that is difficult for the user to visually recognize. Based on the chromaticity change caused by the film thickness change, green is often the least visually recognizable, followed by red. Therefore, the chromaticity change can be made less likely to be visually recognized, and the desired transmittance can be obtained by changing the thickness difference between the first part 121 and the second part 122 for each color of the filter. That is, the thickness difference between the first part 121 and the second part 122 of the green filter is the largest, followed by the thickness difference of the red filter, and the thickness difference of the blue filter is the smallest. As a result, the transmittance from pixel PX to pixel PX4 can be increased while suppressing the chromaticity change and preventing the chromaticity change from being visually recognized. Note that in the above embodiment, the area ratio of the second part 122 of the filter of each color is the same within the same pixel, but a configuration with different area ratios can be used, and the degree of freedom in setting the transmittance can be increased by combining the area ratio and the thickness difference.

[0160] The embodiments according to the present disclosure have been described above, but the present disclosure is not limited to these embodiments. It is obvious that various changes, modifications, combinations, etc. can be made for those skilled in the art.

[0161] In the above embodiments, an example is described in which four regions are provided around the central region 110, but the number of regions around the central region 110 is not limited to four. It is sufficient to provide at least one such region, and the number of regions can be selected as needed. The number and arrangement of the provided regions can be changed according to the illuminance distribution of the backlight 200.

[0162] In the above embodiments, an example in which the backlight is a locally dimming backlight is described, but the present disclosure is not limited thereto. The configuration of the present disclosure can be applied to any liquid crystal display device in which there is a region where the in-plane illuminance of the backlight is reduced, and thus, the display region includes a region where the illuminance distribution is uneven.

[0163] In the above embodiments, an example of the case where the liquid crystal display panel includes three color filters, namely, a red, a green, and a blue color filter, is described. However, the colors of the color filters are not limited thereto. For example, colors other than red, green, and blue can be used, or a single color can be used.

[0164] For purposes of explanation, some example embodiments have been described above. Although the above discussion has given specific embodiments, those skilled in the art will recognize that changes can be made in form and detail without departing from the broader spirit and scope of the invention. Therefore, the specification and drawings should be regarded as illustrative rather than restrictive. Thus, this detailed description should not be regarded as restrictive, and the scope of the invention is defined only by the included claims and all equivalents to which those claims are entitled.

Claims

1. A liquid crystal display device, comprising: A luminaire comprising a first lighting area having a first illumination and a second lighting area having a second illumination lower than the first illumination; and A liquid crystal display comprising a first area illuminated by the first illumination area and a second area illuminated by the second illumination area, wherein The pixel disposed in the second area of ​​the liquid crystal display includes a color filter including a first portion having a first transmittance and a second portion having a second transmittance higher than the first transmittance, and i) pixels disposed in the first region include a color filter including only the first portion having the first transmittance, or ii) the pixels arranged in the first area include a color filter including the first portion having the first transmittance and the second portion having the second transmittance, wherein a ratio of the second portion in the pixels arranged in the second area of ​​the liquid crystal display relative to the first portion and the second portion is greater than a ratio of the second portion in the pixels arranged in the first area relative to the first portion and the second portion.

2. The liquid crystal display device according to claim 1, wherein The thickness of the second portion is thinner than the thickness of the first portion.

3. The liquid crystal display device according to claim 1, wherein: The second portion and the first portion of the color filter are formed of different materials.

4. The liquid crystal display device according to claim 1, wherein: When the pixel is viewed planarly, the first portion and the second portion are juxtaposed in a stripe-like manner.

5. The liquid crystal display device according to claim 1, wherein The pixels are divided into a plurality of domains, and In each of the plurality of domains, a ratio occupied by the second portion relative to the first portion and the second portion is the same.

6. The liquid crystal display device according to claim 2, wherein: A cell gap of a region where the second portion is disposed is larger than a cell gap of a region where the first portion is disposed.

7. The liquid crystal display device according to claim 1, wherein The illuminator is a local dimming backlight, The second lighting area is arranged to surround the first lighting area, and The second area is disposed to surround the first area.

8. The liquid crystal display device according to claim 1, wherein The color filter includes three color filters, namely, a red color filter, a green color filter and a blue color filter, and The second portion is disposed in at least one of the red, green, and blue color filters.

9. The liquid crystal display device according to claim 1, wherein The color filter includes three color filters, namely, a red color filter, a green color filter and a blue color filter, and The second portion is provided in at least two of the red, green, and blue color filters, and a ratio occupied by the second portion relative to the first and second portions varies for each color.

10. The liquid crystal display device according to claim 1, wherein The color filter includes three color filters, namely, a red color filter, a green color filter and a blue color filter, and The second portion is provided in at least two of the red, green, and blue color filters, and a thickness difference of the second portion relative to the first portion varies for each color.

Images