Liquid crystal display device

Abstract

To provide a liquid crystal display device for suppressing moire.SOLUTION: A liquid crystal display device includes a first liquid crystal display panel, and a second liquid crystal display panel that overlaps with the first liquid crystal display panel. At least one of the first liquid crystal display panel and the second liquid crystal display panel is disposed repeatedly, and has a light-shielding pattern 260 having light-shielding properties. The light-shielding pattern 260 includes a first light-shielding line 262 and a second light-shielding line 264 extending in a predetermined direction. The first light-shielding line 262 includes a first sloped part 262a sloped relative to a predetermined direction and a second sloped part 262b sloped in a direction opposite to the first sloped part 262a relative to a predetermined direction, and the second light-shielding line 264 is adjacent to the first light-shielding line 262 and is linearly symmetrical to the first light-shielding line 262 relative to a predetermined direction. At least one of the first light-shielding line 262 and the second light-shielding line 264 is formed from one of a scanning wire GL and a signal wire DL of the first liquid crystal display panel and the second liquid crystal display panel.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a liquid crystal display device. [Background technology]

[0002] There are known liquid crystal display devices that improve contrast by stacking multiple liquid crystal panels. For example, Patent Document 1 discloses a display panel that includes stacked display liquid crystal panels and a light control panel.

[0003] In Patent Document 1, a display liquid crystal panel realizes a display function, and a light control panel controls light incident on the display liquid crystal panel from a backlight. The light control panel has multiple signal lines (gate lines and data lines), at least some of which are bent lines. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2021-535415 Summary of the Invention [Problem to be solved by the invention]

[0005] In Patent Document 1, the signal lines of the light control panel are made into bent lines, and the signal lines of the light control panel and the grid lines (gate lines and data lines) of the display liquid crystal panel are formed into different patterns to improve moire on the display panel. However, because the bent lines (signal lines) of the light control panel are arranged at equal intervals with the same shape, moire on the display panel cannot be sufficiently suppressed.

[0006] The present disclosure has been made in view of the above circumstances, and has an object to provide a liquid crystal display device in which moire is suppressed. [Means for solving the problem]

[0007] In order to achieve the above object, a liquid crystal display device according to a first aspect of the present disclosure comprises: a first liquid crystal display panel; a second liquid crystal display panel located on the opposite side of the first liquid crystal display panel from the viewer side and overlapping the first liquid crystal display panel, At least one of the first liquid crystal display panel and the second liquid crystal display panel has a light-blocking pattern that is repeatedly arranged and has a light-blocking property; the light-shielding pattern includes a first light-shielding line extending in a predetermined direction and having a first inclined portion inclined with respect to the predetermined direction and a second inclined portion inclined in a direction opposite to the first inclined portion with respect to the predetermined direction; and a second light-shielding line adjacent to the first light-shielding line and axisymmetric with the first light-shielding line with respect to the predetermined direction, At least one of the first light-shielding lines and the second light-shielding lines is formed from either the scanning lines or the signal lines of the first liquid crystal display panel and the second liquid crystal display panel. 、 The first light-shielding line connects the first inclined portion and the second inclined portion and has a flat portion extending parallel to the predetermined direction. [Effects of the Invention]

[0008] According to the present disclosure, the shading pattern includes a first shading line extending in a predetermined direction and having a first inclined portion inclined with respect to the predetermined direction and a second inclined portion inclined in the opposite direction to the first inclined portion with respect to the predetermined direction, and a second shading line adjacent to the first shading line and axisymmetric to the first shading line with respect to the predetermined direction, thereby suppressing moire in liquid crystal display devices. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic diagram showing a liquid crystal display device according to Embodiment 1. FIG. [Figure 2] FIG. 2 is a plan view showing a first liquid crystal display panel according to the first embodiment. [Figure 3] 1 is a cross-sectional view showing a liquid crystal display device according to Embodiment 1. FIG. [Figure 4] FIG. 3 is a plan view showing a second liquid crystal display panel according to the first embodiment. [Figure 5]2A and 2B are schematic diagrams showing a first light-shielding pattern and a second light-shielding pattern according to the first embodiment. [Figure 6] 4 is a schematic diagram showing a first light-shielding pattern, a second light-shielding pattern, and a main pixel of a first liquid crystal display panel, which corresponds to one main pixel of a second liquid crystal display panel, according to the first embodiment. FIG. [Figure 7] FIG. 10 is a schematic diagram showing the relationship between the first light-shielding pattern, the second light-shielding pattern, and the main pixels of the first liquid crystal display panel when the first liquid crystal display panel and the second liquid crystal display panel are misaligned in accordance with the first embodiment. [Figure 8] 4 is a plan view showing scanning lines, signal lines, switching elements, etc. of a second liquid crystal display panel according to the first embodiment. FIG. [Figure 9] 9 is a cross-sectional view of the switching element and contact hole shown in FIG. 8 taken along line AA. [Figure 10] FIG. 2 is a block diagram showing a display control unit according to the first embodiment. [Figure 11] FIG. 10 is a schematic diagram showing a first light-shielding pattern, a second light-shielding pattern, and a main pixel of a first liquid crystal display panel, which corresponds to one main pixel of a second liquid crystal display panel, according to a modified example. [Figure 12] FIG. 10 is a schematic diagram showing an intersection of a first inclined portion and a second inclined portion of a first light-shielding line according to a modified example. [Figure 13] 10A and 10B are schematic diagrams showing a first light-shielding pattern and a second light-shielding pattern according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, a liquid crystal display device according to an embodiment will be described with reference to the drawings.

[0011] A liquid crystal display device 10 according to this embodiment will be described with reference to Figures 1 to 10. The liquid crystal display device 10 displays color images using a first liquid crystal display panel 100 and a second liquid crystal display panel 200, which will be described later.

[0012] As shown in FIG. 1, the liquid crystal display device 10 includes a panel unit 50, a backlight 300, and a display control unit 400. The panel unit 50 includes a first liquid crystal display panel 100 and a second liquid crystal display panel 200. The backlight 300 is a light source that irradiates the first liquid crystal display panel 100 and the second liquid crystal display panel 200 with light. The display control unit 400 controls the display of the first liquid crystal display panel 100 and the second liquid crystal display panel 200. For ease of understanding, the description herein will be made assuming that the rightward direction of the liquid crystal display device 10 in FIG. 1 (the rightward direction on the paper) is the +X direction, the upward direction (the upward direction on the paper) is the +Y direction, and the direction perpendicular to the +X and +Y directions (toward the viewer on the paper) is the +Z direction.

[0013] (Panel section) The panel unit 50 has a first liquid crystal display panel 100 and a second liquid crystal display panel 200. The first liquid crystal display panel 100 is located on the viewer's side (+Z side) and displays color images. The second liquid crystal display panel 200 is located on the opposite side of the first liquid crystal display panel 100 from the viewer's side (the rear side of the first liquid crystal display panel 100) and overlaps the first liquid crystal display panel 100. The second liquid crystal display panel 200 displays monochrome images.

[0014] (First LCD panel) The first liquid crystal display panel 100 is, for example, a known transmissive in-plane switching liquid crystal display panel, and is active-matrix driven by TFTs (Thin Film Transistors).

[0015] 2, the first liquid crystal display panel 100 has main pixels 102 arranged in a matrix. The main pixels 102 are formed of red pixels 104R that emit red light, green pixels 104G that emit green light, and blue pixels 104B that emit blue light, which are defined in a V-shape by a black matrix BM. The red pixels 104R, green pixels 104G, and blue pixels 104B may be collectively referred to as sub-pixels 104.

[0016] The sub-pixel 104 is divided into two domains 104a and 104b, which differ in the rotation direction of the first liquid crystal 130. The domains 104a and 104b are defined by a black matrix BM.

[0017] 3, the first liquid crystal display panel 100 includes a first TFT substrate 110, a first opposing substrate 120, a first liquid crystal 130, a first polarizer 132, a second polarizer 134, and a first driver circuit 136. The first TFT substrate 110 and the first opposing substrate 120 sandwich the first liquid crystal 130. The first polarizer 132 is provided on the first TFT substrate 110, and the second polarizer 134 is provided on the first opposing substrate 120.

[0018] The first TFT substrate 110 is, for example, a glass substrate. A TFT for selecting the sub-pixels 104, a common electrode, a pixel electrode, an alignment film for aligning the first liquid crystal 130, and the like are provided on a main surface 110a of the first TFT substrate 110 facing the first liquid crystal 130 (none of which are shown).

[0019] Furthermore, a plurality of common lines, a plurality of signal lines, and a plurality of scanning lines are formed on the main surface 110a of the first TFT substrate 110 (none of which are shown). The common lines supply a common potential to a common electrode that applies a voltage to the first liquid crystal 130. The signal lines supply a voltage to a pixel electrode that applies a voltage to the first liquid crystal 130 via a TFT. The signal lines extend in the Y direction and bend along the V-shape of the sub-pixels 104. The scanning lines supply a voltage to operate the TFTs. The scanning lines extend linearly in the Y direction. The sub-pixels 104 are surrounded by the signal lines and the scanning lines, and TFTs are provided at the intersections of the scanning lines and the signal lines. A first polarizing plate 132 is provided on a main surface 110b of the first TFT substrate 110 opposite to the main surface 110a.

[0020] As shown in FIG. 3, the first opposing substrate 120 faces the first TFT substrate 110 and is bonded to the first TFT substrate 110 with a sealant 138. The first opposing substrate 120 is, for example, a glass substrate. A color filter 122, a black matrix BM, an alignment film for aligning the first liquid crystal 130, and the like are provided on a main surface 120a of the first opposing substrate 120 facing the first liquid crystal 130. The color filter 122 is, for example, a striped color filter (a color filter whose stripe direction is the Y direction) in which color filters of the same color are arranged in the Y direction. The red, green, and blue color filters of the color filter 122 are surrounded by the black matrix BM and correspond to the red pixel 104R, the green pixel 104G, and the blue pixel 104B, respectively. As shown in FIG. 2, the black matrix BM defines the main pixel 102, the sub-pixel 104, and the domains 104a and 104b. A second polarizing plate 134 is provided on a main surface 120b opposite to the main surface 120a of the first opposing substrate 120. For ease of understanding, the black matrix BM, alignment film, etc. are omitted from Fig. 3.

[0021] 3, the first liquid crystal 130 is sandwiched between the first TFT substrate 110 and the first counter substrate 120. The first liquid crystal 130 is, for example, a positive nematic liquid crystal. The first liquid crystal 130 is aligned in a direction parallel to the main surface 110a of the first TFT substrate 110 by an alignment film. Furthermore, the first liquid crystal 130 rotates in a plane parallel to the main surface 110a of the first TFT substrate 110 when a voltage is applied.

[0022] The first polarizer 132 is provided on the main surface 110b of the first TFT substrate 110, and the second polarizer 134 is provided on the main surface 120b of the first counter substrate 120. Either the transmission axis of the first polarizer 132 or the transmission axis of the second polarizer 134 is arranged parallel to the alignment direction of the first liquid crystal 130, and the transmission axis of the first polarizer 132 and the transmission axis of the second polarizer 134 are perpendicular to each other. The first polarizer 132 is attached to a second counter substrate 220 of the second liquid crystal display panel 200 (described later) by a light-transmitting adhesive layer 150. The adhesive layer 150 is, for example, an OCA (Optical Clear Adhesive).

[0023] The first driver circuit 136 is provided on the main surface 110a of the first TFT substrate 110. The first driver circuit 136 supplies voltages to the scanning lines, signal lines, and common lines based on color image signals supplied from the display control unit 400.

[0024] (Second LCD panel) 3, the second liquid crystal display panel 200 is located on the rear side (-Z side) of the first liquid crystal display panel 100, and is bonded to the first liquid crystal display panel 100 by an adhesive layer 150. The second liquid crystal display panel 200 displays monochrome images.

[0025] In this embodiment, the second liquid crystal display panel 200 is a transmissive IPS-mode liquid crystal display panel using positive liquid crystal. The second liquid crystal display panel 200 is active-matrix driven by switching elements 240, which will be described later. As shown in FIG. 4, the second liquid crystal display panel 200 has main pixels 202 arranged in a matrix. In this embodiment, one main pixel 202 of the second liquid crystal display panel 200 corresponds to 16 (4×4) main pixels 102 of the first liquid crystal display panel 100, and one main pixel 202 of the second liquid crystal display panel 200 emits light to the 16 main pixels 102 of the first liquid crystal display panel 100. Note that in FIG. 4, the scanning lines GL and the signal lines DL are indicated by dashed lines. In the following drawings, the scanning lines GL and the signal lines DL may also be indicated by dashed lines or solid lines.

[0026] 3, the second liquid crystal display panel 200 includes a second TFT substrate 210, a second opposing substrate 220, a second liquid crystal 230, a third polarizer 232, and a second driver circuit 236. The second TFT substrate 210 and the second opposing substrate 220 sandwich the second liquid crystal 230. The third polarizer 232 is provided on the second TFT substrate 210. In this embodiment, the first polarizer 132 of the first liquid crystal display panel 100 also serves as the polarizer on the light-emitting side of the second liquid crystal display panel 200. The second liquid crystal display panel 200 does not include a color filter or a black matrix.

[0027] The second TFT substrate 210 is, for example, a glass substrate. A plurality of scanning lines GL, a plurality of signal lines DL, a common line (not shown), switching elements 240, pixel electrodes 250, and common electrodes CE of the main pixels 202, an alignment film (not shown) for aligning the second liquid crystal 230, and the like are formed on a main surface 210a of the second TFT substrate 210 facing the second liquid crystal 230, as will be described later. The common line supplies a common potential to the common electrode CE that applies a voltage to the second liquid crystal 230. The signal line DL supplies a voltage to the pixel electrodes 250 that apply a voltage to the second liquid crystal 230 via the switching elements 240. The scanning line GL supplies a voltage for operating the switching elements 240. A third polarizer 232 is provided on a main surface 210b of the second TFT substrate 210 opposite to the main surface 210a.

[0028] In this embodiment, the scanning lines GL form a first light-shielding pattern 260, which will be described later, and the signal lines DL form a second light-shielding pattern 270. The configurations of the scanning lines GL, the signal lines DL, the main pixels 202 (the switching elements 240, the common electrodes CE, and the pixel electrodes 250), etc. will be described later.

[0029] The second opposing substrate 220 faces the second TFT substrate 210 and is bonded to the second TFT substrate 210 with a sealant 238. The second opposing substrate 220 is, for example, a glass substrate. An alignment film (not shown) that aligns the second liquid crystal 230 is provided on a main surface 220a of the second opposing substrate 220 facing the second liquid crystal 230. An adhesive layer 150 is provided on a main surface 220b of the second opposing substrate 220 opposite the main surface 220a. The second opposing substrate 220 is bonded to the first liquid crystal display panel 100 (first polarizer 132) via the adhesive layer 150.

[0030] The second liquid crystal 230 is sandwiched between the second TFT substrate 210 and the second opposing substrate 220. The second liquid crystal 230 is a positive nematic liquid crystal. The second liquid crystal 230 is initially aligned in the Y direction by an alignment film. When a voltage is applied, the second liquid crystal 230 rotates in a plane parallel to the main surface 210a of the second TFT substrate 210.

[0031] The third polarizer 232 is provided on the main surface 210b of the second TFT substrate 210. The transmission axis of the third polarizer 232 is arranged parallel to the alignment direction of the second liquid crystal 230. The transmission axis of the third polarizer 232 and the transmission axis of the first polarizer 132 (polarizer on the light-emitting side of the second liquid crystal display panel 200) of the first liquid crystal display panel 100 are perpendicular to each other, and the second liquid crystal display panel 200 operates in a normally black mode.

[0032] The second driver circuit 236 is provided on the main surface 210a of the second TFT substrate 210. The second driver circuit 236 supplies voltages to the scanning lines GL, the signal lines DL, and the common lines based on signals supplied from the display control unit 400.

[0033] The scanning lines GL, the signal lines DL, the first light-shielding pattern 260, and the second light-shielding pattern 270 will be described with reference to FIGS.

[0034] First, the scanning lines GL and the first light-shielding patterns 260 will be described. The scanning lines GL have light-shielding properties and are made of metal (aluminum (Al), molybdenum (Mo), etc.). As shown in FIGS. 4 and 5, the scanning lines GL extend in the X direction and are arranged side by side in the Y direction. Furthermore, a pair of adjacent scanning lines GL extend in the X direction and form a first light-shielding pattern 260 having light-shielding properties. The first light-shielding patterns 260 are repeatedly arranged in the Y direction. Here, light-shielding properties mean that at least a portion of light incident from the backlight 300 is blocked. Furthermore, in this embodiment, the X direction corresponds to a predetermined direction of the first light-shielding pattern 260 (scanning lines GL).

[0035] 5, one of a pair of adjacent scanning lines GL (hereinafter also referred to as a first light-shielding line 262) has a first inclined portion 262a, a second inclined portion 262b, and a first flat portion 262c. The first inclined portion 262a is inclined at an acute angle counterclockwise with respect to the +X direction, and the second inclined portion 262b is inclined at an acute angle in the opposite direction (clockwise) to the first inclined portion 262a with respect to the +X direction. The first flat portion 262c extends parallel to the X direction and connects the first inclined portion 262a and the second inclined portion 262b.

[0036] The other scanning line GL (hereinafter also referred to as the second light-shielding line 264) of a pair of adjacent scanning lines GL is symmetrical to one scanning line GL (first light-shielding line 262) with respect to the X direction and has a third inclined portion 264a, a fourth inclined portion 264b, and a second flat portion 264c. The third inclined portion 264a faces the first inclined portion 262a of the first light-shielding line 262 and is inclined at an acute angle clockwise with respect to the +X direction. The fourth inclined portion 264b faces the second inclined portion 262b of the first light-shielding line 262 and is inclined at an acute angle with respect to the +X direction in the opposite direction (counterclockwise) to the third inclined portion 264a. The second flat portion 264c extends parallel to the X direction, faces the first flat portion 262c of the first light-shielding line 262, and connects the third inclined portion 264a and the fourth inclined portion 264b.

[0037] In this embodiment, the first light-shielding line 262 has a first inclined portion 262a inclined at an acute angle counterclockwise with respect to the +X direction and a second inclined portion 262b inclined at an acute angle in the opposite direction to the first inclined portion 262a with respect to the +X direction, and the first light-shielding line 262 and the second light-shielding line 264 adjacent to the first light-shielding line 262 are in an axisymmetric relationship with respect to the X direction. Therefore, as shown in Fig. 5, the distance between the first light-shielding line 262 and the second light-shielding line 264 continuously changes between the first inclined portion 262a of the first light-shielding line 262 and the third inclined portion 264a of the second light-shielding line 264 (distance L1), and also continuously changes between the second inclined portion 262b of the first light-shielding line 262 and the fourth inclined portion 264b of the second light-shielding line 264 (distance L2). Furthermore, the distances (distances L3 and L4) between the first flat portions 262c of the first light-shielding lines 262 and the second flat portions 264c of the second light-shielding lines 264 also change. As a result, even when the second liquid crystal display panel 200 and the first liquid crystal display panel 100 are overlapped, interference of spatial frequencies between the second liquid crystal display panel 200 and the first liquid crystal display panel 100 is suppressed, and moire in the liquid crystal display device 10 can be suppressed.

[0038] Next, the signal lines DL and the second light-shielding pattern 270 will be described. Like the scanning lines GL, the signal lines DL have light-shielding properties and are made of metal (aluminum (Al), molybdenum (Mo), etc.). As shown in FIGS. 4 and 5, the signal lines DL extend in the Y direction and are arranged side by side in the X direction. Furthermore, a pair of adjacent signal lines DL extend in the Y direction and form a second light-shielding pattern 270 having light-shielding properties. In this embodiment, the Y direction corresponds to the predetermined direction of the second light-shielding pattern 270 (signal lines DL).

[0039] 5, one signal wiring DL (hereinafter also referred to as the third light-shielding line 272) of a pair of adjacent signal wirings DL has a fifth inclined portion 272a and a sixth inclined portion 272b. The fifth inclined portion 272a is inclined at an acute angle counterclockwise with respect to the +Y direction. The sixth inclined portion 272b is inclined at an acute angle in the opposite direction (clockwise) to the fifth inclined portion 272a with respect to the +Y direction.

[0040] The other signal wiring DL (hereinafter also referred to as the fourth light-shielding line 274) of a pair of adjacent signal wirings DL is symmetrical to one signal wiring DL (the third light-shielding line 272) with respect to the Y direction, and has a seventh inclined portion 274a and an eighth inclined portion 274b. The seventh inclined portion 274a faces the fifth inclined portion 272a of the third light-shielding line 272, and is inclined at an acute angle clockwise with respect to the +Y direction. The eighth inclined portion 274b faces the sixth inclined portion 272b of the third light-shielding line 272, and is inclined at an acute angle in the opposite direction (counterclockwise) to the seventh inclined portion 274a with respect to the +Y direction. The third shading line 272 and the fourth shading line 274 of the second shading pattern 270 correspond to the first shading line and the second shading line of the shading pattern, respectively, and the fifth inclined portion 272a and the sixth inclined portion 272b of the third shading line 272 correspond to the first inclined portion and the second inclined portion of the first shading line, respectively.

[0041] In this embodiment, the third light-shielding line 272 has a fifth inclined portion 272a inclined at an acute angle counterclockwise with respect to the +Y direction and a sixth inclined portion 272b inclined at an acute angle in the opposite direction to the fifth inclined portion 272a with respect to the +Y direction. The third light-shielding line 272 and the fourth light-shielding line 274 adjacent to the third light-shielding line 272 are in a line-symmetric relationship with respect to the Y direction. Therefore, as shown in FIG. 5 , the distance L5 between the third light-shielding line 272 and the fourth light-shielding line 274 changes continuously. As a result, even when the second liquid crystal display panel 200 and the first liquid crystal display panel 100 are overlapped, interference of spatial frequencies between the second liquid crystal display panel 200 and the first liquid crystal display panel 100 is suppressed, and moire in the liquid crystal display device 10 can be suppressed.

[0042] 6, the overlap between the first light-shielding pattern 260, the second light-shielding pattern 270, and the main pixel 102 of the first liquid crystal display panel 100 will be described. Fig. 6 shows the first light-shielding pattern 260 (scanning line GL), the second light-shielding pattern 270 (signal line DL), and the main pixel 102 of the first liquid crystal display panel 100, which correspond to one main pixel 202 of the second liquid crystal display panel 200. In this embodiment, as will be described later, one main pixel 102 of the first liquid crystal display panel 100 is driven by a voltage (signal) from a pair of adjacent scan lines GL and a pair of adjacent signal lines DL.

[0043] 6 , in the first light-shielding pattern 260 extending in the X direction, the first inclined portion 262a and the second inclined portion 262b of the first light-shielding line 262 and the third inclined portion 264a and the fourth inclined portion 264b of the second light-shielding line 264 are inclined across multiple sub-pixels 104 (104R, 104G, 104B) of different colors of the first liquid crystal display panel 100. As a result, the luminance of the sub-pixels 104 overlapping with the first light-shielding pattern 260 is slightly reduced, and the main pixel 102 having the sub-pixels 104 overlapping with the first light-shielding pattern 260 exhibits a color slightly different from the color that it should display. However, because the sub-pixels 104 that experience the same degree of luminance reduction are located close to each other, the luminance of the sub-pixels 104 is averaged to the viewer of the liquid crystal display device 10, and the viewer perceives the luminance of the multiple sub-pixels 104 with reduced luminance as the same luminance gradation. Therefore, it is possible to prevent color moiré from being recognized by the viewer in the overall display of the liquid crystal display device 10. The first flat portion 262c of the first light-shielding line 262 and the second flat portion 264c of the second light-shielding line 264 overlap the black matrix BM of the first liquid crystal display panel 100.

[0044] In the second light-shielding pattern 270 extending in the Y direction, the fifth inclined portion 272a and the sixth inclined portion 272b of the third light-shielding line 272 and the seventh inclined portion 274a and the eighth inclined portion 274b of the fourth light-shielding line 274 are inclined across the sub-pixels 104 (104R, 104B) of different colors of the first liquid crystal display panel 100. As a result, similar to the first light-shielding pattern 260, the main pixel 102 having the sub-pixel 104 overlapping with the second light-shielding pattern 270 will exhibit a color slightly different from the color to be displayed. However, the color exhibited by the main pixel 102 having the sub-pixel 104 overlapping with the second light-shielding pattern 270 and the color exhibited by the main pixel 102 located near the main pixel 102 having the sub-pixel 104 overlapping with the second light-shielding pattern 270 are perceived as different colors by the viewer, and the saturation of the combined color is also reduced, so that the overall display of the liquid crystal display device 10 can prevent color moiré from being perceived by the viewer.

[0045] 7 , even if the second liquid crystal display panel 200 and the first liquid crystal display panel 100 are misaligned, the areas of the first light-shielding pattern 260 and the second light-shielding pattern 270 that overlap the subpixels 104 of the first liquid crystal display panel 100 do not change significantly compared to when the second liquid crystal display panel 200 and the first liquid crystal display panel 100 are precisely aligned. Even if the second liquid crystal display panel 200 and the first liquid crystal display panel 100 are misaligned, the first inclined portion 262a to the eighth inclined portion 274b straddle the subpixels 104 of different colors. This allows the colors of the main pixels 102 to be averaged between adjacent main pixels 102, thereby preventing color moiré from being perceived by the viewer even if the second liquid crystal display panel 200 and the first liquid crystal display panel 100 are misaligned.

[0046] Next, the scanning lines GL (first light-shielding lines 262 and second light-shielding lines 264), the signal lines DL (third light-shielding lines 272 and fourth light-shielding lines 274), the switching elements 240 of the main pixels 202, the pixel electrodes 250, and the common electrodes CE will be described with reference to FIGS. 8 and 9. FIG. 8 is a plan view showing the scanning lines GL, the signal lines DL, the switching elements 240, etc. FIG. 9 is a cross-sectional view of the switching elements 240 and contact holes CH shown in FIG. 8, taken along line AA. Note that the common electrode CE is omitted in FIG. 8 for ease of understanding.

[0047] In this embodiment, one main pixel 202 has four switching elements 240 and four pixel electrodes 250. One main pixel 202 is driven by voltages (signals) from a pair of adjacent scanning lines GL (first light-shielding line 262 and second light-shielding line 264) and a pair of adjacent signal lines DL (third light-shielding line 272 and fourth light-shielding line 274).

[0048] 9, the scanning lines GL (first light-shielding lines 262 and second light-shielding lines 264) are formed on the main surface 210a of the second TFT substrate 210 and are covered with a first insulating layer 282. The signal lines DL (third light-shielding lines 272 and fourth light-shielding lines 274) are formed on the first insulating layer 282 and are covered with a second insulating layer 284.

[0049] 9, the common electrode CE is formed on the second insulating layer 284. The common electrode CE is made of, for example, ITO (Indium Tin Oxide). The common electrode CE is covered with a third insulating layer 286.

[0050] The four switching elements 240 are provided at the intersections of the scanning lines GL and the signal lines DL. As shown in Figures 8 and 9, each switching element 240 has a gate electrode 242, a semiconductor layer 244, a source electrode 246, and a drain electrode 248. The switching elements 240 are, for example, TFT elements.

[0051] The gate electrode 242 is formed integrally with the scanning line GL on the main surface 210a of the second TFT substrate 210. The gate electrode 242, like the scanning line GL, is covered with a first insulating layer 282. The semiconductor layer 244 is provided in an island shape on the gate electrode 242 with the first insulating layer 282 interposed therebetween. The semiconductor layer 244 is formed of, for example, amorphous silicon. The source electrode 246 is formed integrally with the signal line DL. The drain electrode 248 extends from above the semiconductor layer 244 along the scanning line GL, then bends and connects to the pixel electrode 250. As shown in FIG. 9 , the drain electrode 248 is connected to the pixel electrode 250 via a contact hole CH that penetrates the third insulating layer 286 and the second insulating layer 284. The gate electrode 242, the source electrode 246, and the drain electrode 248 are formed of a metal such as aluminum (Al) or molybdenum (Mo). Furthermore, the semiconductor layer 244, the source electrode 246, and the drain electrode 248 are covered with a second insulating layer 284, as shown in FIG.

[0052] 9, the first insulating layer 282 covers the scanning line GL and the gate electrode 242 of the switching element 240. The second insulating layer 284 covers the semiconductor layer 244, source electrode 246, drain electrode 248, and first insulating layer 282 of the switching element 240. The third insulating layer 286 covers the common electrode CE and second insulating layer 284. The first insulating layer 282, the second insulating layer 284, and the third insulating layer 286 are formed of silicon nitride (SiNx), silicon oxide (SiOx), or the like.

[0053] As shown in FIG. 8, each of the four pixel electrodes 250 is connected to a corresponding one of the four switching elements 240 (drain electrodes 248). The pixel electrode 250 has a comb-like shape, and the teeth 252 are inclined with respect to the Y direction. As shown in FIG. 9, the pixel electrode 250 is formed on a third insulating layer 286. The pixel electrode 250 is made of, for example, ITO. Note that the angle at which the teeth 252 of the pixel electrode 250 are inclined with respect to the Y direction is unrelated to the angle at which the signal wiring DL (third light-shielding line 272 and fourth light-shielding line 274) are inclined with respect to the Y direction.

[0054] (backlight) 1, the backlight 300 is disposed on the rear side (-Z side) of the second liquid crystal display panel 200. The backlight 300 is, for example, a direct-type backlight. The backlight 300 includes white LED (Light Emitting Diode) elements, a reflective sheet, a diffusion sheet, etc. (none of which are shown).

[0055] (Display control unit) The display control unit 400 controls the display of the first liquid crystal display panel 100 and the second liquid crystal display panel 200. As shown in Fig. 10 , the display control unit 400 includes an image data distribution unit 410, a first image signal generation unit 420, a second image luminance signal generation unit 430, and a second image signal generation unit 440.

[0056] The image data distribution unit 410 distributes the input image data to the first image signal generation unit 420 and the second image luminance signal generation unit 430 .

[0057] The first image signal generation unit 420 generates a color image to be displayed on the first liquid crystal display panel 100 from the input image data distributed by the image data distribution unit 410. Specifically, a first gradation conversion unit 422 of the first image signal generation unit 420 performs gradation conversion to convert the distributed input image data into color image data having brightness-gradation characteristics suitable for the first liquid crystal display panel 100. For example, a lookup table in which input / output relationships are preset is used for data conversion. The first image signal generation unit 420 transmits a color image signal representing the generated color image to the first driver circuit 136 of the first liquid crystal display panel 100.

[0058] The second image luminance signal generation unit 430 generates a luminance signal for generating a monochrome image to be displayed on the second liquid crystal display panel 200 from the input image data distributed by the image data distribution unit 410. The second image luminance signal generation unit 430 calculates the luminance level of one main pixel 202 of the second liquid crystal display panel 200 from, for example, the average value, frequent value, minimum value, maximum value, etc. of the red, green, and blue gradation values ​​of the 16 main pixels 102 of the first liquid crystal display panel 100 onto which light emitted from one main pixel 202 of the second liquid crystal display panel 200 is incident. The calculated luminance level may be a gradation value. The second image luminance signal generation unit 430 transmits a luminance signal representing the calculated luminance level to the second image signal generation unit 440.

[0059] The second image signal generation unit 440 generates a monochrome image to be displayed on the second LCD panel 200 based on the luminance signal transmitted from the second image luminance signal generation unit 430. The second image signal generation unit 440 generates a monochrome image by, for example, performing averaging and gradation conversion. Specifically, the calculation unit 442 of the second image signal generation unit 440 averages the luminance levels of main pixels 202 located within a predetermined distance from the main pixel 202 of interest, for example, by performing a weighted average based on the distance from the main pixel 202 of interest. This allows the second image signal generation unit 440 to generate a monochrome image with blurred edges. Furthermore, the second gradation conversion unit 444 of the second image signal generation unit 440 generates monochrome image data having luminance-gradation characteristics suitable for the second LCD panel 200. The configuration of the second gradation conversion unit 444 is similar to that of the first gradation conversion unit 422 of the first image signal generation unit 420.

[0060] The monochrome image signal sent to the second liquid crystal display panel 200 is delayed relative to the color image signal sent to the first liquid crystal display panel 100 due to the calculation of brightness levels, averaging processing, etc. performed by the second image brightness signal generation unit 430. Therefore, the display control unit 400 is provided with a synchronization circuit (not shown) to synchronize the output of the monochrome image signal and the color image signal. The synchronization circuit causes a monochrome image corresponding to the color image of the first liquid crystal display panel 100 to be displayed on the second liquid crystal display panel 200, so that an appropriate color image is displayed on the liquid crystal display device 10.

[0061] The display control unit 400 is configured with a CPU (Central Processing Unit), a memory, etc. The functions of the display control unit 400 are realized, for example, by the CPU executing a program stored in the memory.

[0062] As described above, the first light-shielding pattern (scanning line GL) of the second liquid crystal display panel 200 is formed of the first light-shielding line 262, which has the first inclined portion 262a inclined with respect to the +X direction, the second inclined portion 262b inclined in the opposite direction to the first inclined portion 262a with respect to the +X direction, and the first flat portion 262c connecting the first inclined portion 262a and the second inclined portion 262b, and the second light-shielding line 264, which is line-symmetrical to the first light-shielding line 262 with respect to the X direction. This suppresses interference of spatial frequencies between the first liquid crystal display panel 100 and the second liquid crystal display panel 200, thereby suppressing moire in the liquid crystal display device 10. Furthermore, the occurrence of color moire can be suppressed.

[0063] Furthermore, the second light-shielding pattern (signal wiring DL) of the second liquid crystal display panel 200 is formed of the third light-shielding line 272, which has the fifth inclined portion 272a inclined at an acute angle with respect to the +Y direction and the sixth inclined portion 272b inclined at an acute angle with respect to the +Y direction in the opposite direction to the fifth inclined portion 272a, and the fourth light-shielding line 274, which is symmetrical to the third light-shielding line 272 with respect to the Y direction, thereby suppressing interference of spatial frequencies between the first liquid crystal display panel 100 and the second liquid crystal display panel 200 and suppressing moire in the liquid crystal display device 10. The occurrence of color moire can also be suppressed.

[0064] <Modification> Although the embodiments have been described above, various modifications can be made to the present disclosure without departing from the spirit and scope of the present disclosure.

[0065] In this embodiment, the first liquid crystal display panel 100 and the second liquid crystal display panel 200 operate in a lateral electric field mode. The operation mode of the first liquid crystal display panel 100 and the second liquid crystal display panel 200 is arbitrary.

[0066] In this embodiment, the first polarizer 132 of the first liquid crystal display panel 100 also serves as the polarizer on the light exit side of the second liquid crystal display panel 200. The second liquid crystal display panel 200 may include a polarizer on the main surface 220b of the second opposing substrate 220.

[0067] In this embodiment, the switching elements 240 of the second liquid crystal display panel 200 are formed along the scanning lines GL (first light-shielding lines 262 and second light-shielding lines 264), and the switching elements 240 are inclined with respect to the X direction. The switching elements 240 may also be formed along the X direction. This can further suppress moire.

[0068] In this embodiment, one main pixel 202 of the second liquid crystal display panel 200 corresponds to 16 main pixels 102 of the first liquid crystal display panel 100. The number of main pixels 102 of the first liquid crystal display panel 100 that corresponds to one main pixel 202 of the second liquid crystal display panel 200 is arbitrary.

[0069] For example, one main pixel 202 of the second liquid crystal display panel 200 may correspond to one main pixel 102 of the first liquid crystal display panel 100. In this case, the display control unit 400 determines the luminance level of one main pixel 202 of the second liquid crystal display panel 200 based on the color image data of the corresponding one main pixel 102 of the first liquid crystal display panel 100. Alternatively, the display control unit 400 may determine the luminance level of a monochrome image by using the maximum gradation value among the red gradation value, green gradation value, and blue gradation value of each main pixel of the input image data as the luminance level of each main pixel 202 of the second liquid crystal display panel 200.

[0070] In this embodiment, the second liquid crystal display panel 200 includes a first light-shielding pattern 260 and a second light-shielding pattern 270. The second liquid crystal display panel 200 only needs to include at least one of the first light-shielding pattern 260 and the second light-shielding pattern 270.

[0071] Furthermore, the first light-shielding lines 262 of the first light-shielding pattern 260 have first flat portions 262c, and the second light-shielding lines 264 of the first light-shielding pattern 260 have second flat portions 264c. The first light-shielding lines 262 do not necessarily have the first flat portions 262c, and the second light-shielding lines 264 do not necessarily have the second flat portions 264c. In other words, the first light-shielding lines 262 and the second light-shielding lines 264 may be in a line-symmetric relationship with respect to the X direction, and may each extend in a zigzag pattern in the X direction.

[0072] 11, the third light-shielding line 272 of the second light-shielding pattern 270 may have a third flat portion 272c that connects the fifth inclined portion 272a and the sixth inclined portion 272b and extends parallel to the Y direction. Also, the fourth light-shielding line 274 of the second light-shielding pattern 270 may have a fourth flat portion 274c that connects the seventh inclined portion 274a and the eighth inclined portion 274b and extends parallel to the Y direction.

[0073] The flat portions connecting the inclined portions in the light-shielding lines are preferably provided on the light-shielding lines extending in a direction perpendicular to the stripe direction of the color filters 122 of the first liquid crystal display panel 100. For example, when the color filters 122 of the first liquid crystal display panel 100 are color filters in which color filters of the same color are arranged in the Y direction as in the embodiment, the flat portions (first flat portion 262c and second flat portion 264c) are preferably provided on the first light-shielding lines 262 and second light-shielding lines 264 extending in the X direction. 12, the intersection P1 between the first inclined portion 262a and the second inclined portion 262b and the intersection P2 between the third inclined portion 264a and the fourth inclined portion 264b are located between the subpixels 104 (104R and 104B) of a specific color of the first liquid crystal display panel 100, thereby preventing the first light-shielding lines 262 and the second light-shielding lines 264 from blocking too much light incident on the subpixels 104 of a specific color. If the first light-shielding lines 262 and the second light-shielding lines 264 block too much light incident on the subpixels 104 of a specific color, color shift may occur in the display of the liquid crystal display device 10. Note that the second light-shielding pattern 270 is omitted from FIG. 12 for ease of understanding.

[0074] The stripe direction of the color filter 122 of the first liquid crystal display panel 100 may be the X direction. In this case, it is preferable that the third light-shielding lines 272 and the fourth light-shielding lines 274 extending in the Y direction have flat portions (third flat portions 272c and fourth flat portions 274c).

[0075] The first and second light-shielding lines 262 and 264 of the first light-shielding pattern 260 and the third and fourth light-shielding lines 272 and 274 of the second light-shielding pattern 270 may be curved, as shown in FIG.

[0076] In the embodiment, the scanning wiring GL forms the first light-shielding line 262 and the second light-shielding line 264 of the first light-shielding pattern 260. At least one of the first light-shielding line 262 and the second light-shielding line 264 of the first light-shielding pattern 260 may be formed from the scanning wiring GL. For example, when the first light-shielding line 262 is formed from the scanning wiring GL, the second light-shielding line 264 may be a low-resistance wiring that connects the common electrode CE. The second light-shielding line 264 may be a light-shielding body (light-shielding pattern) formed from an organic material having light-shielding properties. Also, in the second light-shielding pattern 270, at least one of the third light-shielding line 272 and the fourth light-shielding line 274 may be formed from the signal wiring DL.

[0077] Furthermore, the first light-shielding pattern 260 and the second light-shielding pattern 270 may be provided on the first liquid crystal display panel 100. The first light-shielding pattern 260 and the second light-shielding pattern 270 may be provided on at least one of the first liquid crystal display panel 100 and the second liquid crystal display panel 200.

[0078] Although the preferred embodiments have been described above, the present disclosure is not limited to such specific embodiments, and the present disclosure includes the inventions described in the claims and their equivalents. [Explanation of symbols]

[0079] 10 Liquid crystal display device, 50 Panel section, 100 First liquid crystal display panel, 102 Main pixel, 104 Sub-pixel, 104a, 104b Domain, 104R Red pixel, 104G Green pixel, 104B Blue pixel, 110 First TFT substrate, 110a, 110b Main surface, 120 First opposing substrate, 120a, 120b Main surface, 122 Color filter, 130 First liquid crystal, 132 First polarizer, 134 Second polarizer, 136 First driver circuit, 138 Sealant, 150 Adhesive layer, 200 Second liquid crystal display panel, 202 Main pixel, 210 Second TFT substrate, 210a, 210b Main surface, 220 Second opposing substrate, 220a, 220b Main surface, 230 Second liquid crystal, 232 Third polarizer, 236 Second driver circuit, 238, sealing material, 240, switching element, 242, gate electrode, 244, semiconductor layer, 246, source electrode, 248, drain electrode, 250, pixel electrode, 252, tooth portion, 260, first light-shielding pattern, 262, first light-shielding line, 262a, first inclined portion, 262b, second inclined portion, 262c, first flat portion, 264, second light-shielding line, 264a, third inclined portion, 264b, fourth inclined portion, 264c, second flat portion, 270, second light-shielding pattern, 272, third light-shielding line, 272a, fifth inclined portion, 272b, sixth inclined portion, 272c, third flat portion, 274, fourth light-shielding line, 274a, seventh inclined portion, 274b, eighth inclined portion, 274c, fourth flat portion, 282, first insulating layer, 284, second insulating layer, 286 Third insulating layer, 300 backlight, 400 display control unit, 410 image data distribution unit, 420 first image signal generation unit, 422 first gradation conversion unit, 430 second image luminance signal generation unit, 440 second image signal generation unit, 442 calculation unit, 444 second gradation conversion unit, BM black matrix, CE common electrode, CH contact hole, DL signal wiring, GL scanning wiring, L1 to L5 spacing, P1, P2 intersection points

Claims

1. a first liquid crystal display panel; a second liquid crystal display panel located on the opposite side of the first liquid crystal display panel from the viewer side and overlapping the first liquid crystal display panel, At least one of the first liquid crystal display panel and the second liquid crystal display panel has a light-shielding pattern that is repeatedly arranged and has a light-shielding property; the light-shielding pattern includes a first light-shielding line extending in a predetermined direction and having a first inclined portion inclined with respect to the predetermined direction and a second inclined portion inclined in a direction opposite to the first inclined portion with respect to the predetermined direction; and a second light-shielding line adjacent to the first light-shielding line and line-symmetrical to the first light-shielding line with respect to the predetermined direction, at least one of the first light-shielding lines and the second light-shielding lines is formed from either a scanning line or a signal line of the first liquid crystal display panel or the second liquid crystal display panel; the first light-shielding line has a flat portion that connects the first inclined portion and the second inclined portion and extends parallel to the predetermined direction; LCD display device.

2. the first inclined portion and the second inclined portion of the first light-shielding line of one of the first liquid crystal display panel and the second liquid crystal display panel are inclined across a plurality of pixels of the other of the first liquid crystal display panel and the second liquid crystal display panel; The liquid crystal display device according to claim 1 .

3. a stripe direction of a color filter provided on one of the first liquid crystal display panel and the second liquid crystal display panel is perpendicular to a direction in which the flat portion of the first light-shielding line of the light-shielding pattern provided on the other of the first liquid crystal display panel and the second liquid crystal display panel extends; 3. The liquid crystal display device according to claim 1 or 2.

Images