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 and has a light shielding pattern. The light shielding pattern includes: a first light shielding line 262 having a first sloped section that extends in a predetermined direction and is sloped relative to the predetermined direction and a second sloped section sloped in a direction opposite to the first sloped section relative to the predetermined direction; and a second light shielding line 264 that is adjacent to the first light shielding line 262 and is linearly symmetrical to the first light shielding line relative to the predetermined direction. A pixel electrode 250 of the second liquid crystal display panel has multiple tooth sections 254a, 254b, and a connection section 252 for connecting the multiple tooth sections 254a, 254b, and the connection section 252 overlaps with the first light shielding section 262 or the second light shielding section 264.SELECTED DRAWING: Figure 7

Description

Technical Field

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

Background Art

[0002] A liquid crystal display device with improved contrast by stacking a plurality of liquid crystal panels is known. For example, Patent Document 1 discloses a display panel including a display liquid crystal panel and a light control panel.

[0003] In Patent Document 1, the display liquid crystal panel realizes a display function, and the light control panel controls the light incident from the backlight to the display liquid crystal panel. The light control panel includes a plurality of signal lines (gate lines and data lines), and at least a part of the plurality of signal lines is a broken line. By forming the signal lines of the light control panel into broken lines, 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 in different patterns to improve moire of the display panel.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] When a comb-shaped pixel electrode is combined with a bent signal line as in Patent Document 1, moire may occur due to interference between the dark lines generated in the region where the liquid crystal molecules do not rotate when a voltage is applied and the grid lines of the display liquid crystal panel. For example, in a pixel electrode having a plurality of bent tooth portions and a connecting portion connecting the tooth portions, the liquid crystal molecules do not rotate in the vicinity of the connecting portion, the bent portions of the tooth portions, the boundaries of adjacent pixel electrodes, etc.

[0006] The present disclosure has been made in view of the above circumstances, and an object thereof is to provide a liquid crystal display device with suppressed moiré.

Means for Solving the Problems

[0007] The liquid crystal display device according to the first aspect of the present disclosure includes a first liquid crystal display panel having first main pixels, a second liquid crystal display panel having second main pixels corresponding to the plurality of first main pixels and a light-shielding pattern that is repeatedly arranged and has light-shielding properties, the second liquid crystal display panel overlapping the first liquid crystal display panel, the light-shielding pattern includes a first light-shielding line that extends in a predetermined direction and has 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 that is adjacent to the first light-shielding line and is line-symmetric with the first light-shielding line with respect to the predetermined direction, the pixel electrode of the second main pixel has a plurality of tooth portions and a connecting portion connecting the plurality of tooth portions, at least one of the first light-shielding line and the second light-shielding line is formed from either a scanning wiring or a signal wiring of the second liquid crystal display panel, when viewed in plan, the connecting portion overlaps the first light-shielding line or the second light-shielding line.

[0008] The liquid crystal display device according to the second aspect of the present disclosure includes an element having an electrode or a light-shielding portion, a liquid crystal display panel having main pixels and a light-shielding pattern that is repeatedly arranged and has light-shielding properties, the liquid crystal display panel overlapping the element, the light-shielding pattern includes a first light-shielding line that extends in a predetermined direction and has 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 that is adjacent to the first light-shielding line and is line-symmetric with the first light-shielding line with respect to the predetermined direction, the pixel electrode of the main pixel has a plurality of tooth portions and a connecting portion connecting the plurality of tooth portions, At least one of the first light-shielding line and the second light-shielding line is formed from either the scanning wiring or the signal wiring of the liquid crystal display panel. When viewed in plan view, the connection portion overlaps with the first light-shielding line or the second light-shielding line.

Effect of the Invention

[0009] According to the present disclosure, since the connection portion connecting the plurality of tooth portions overlaps with the first light-shielding line or the second light-shielding line, the number of dark lines generated when a voltage is applied to the liquid crystal can be reduced, and moiré can be suppressed.

Brief Description of the Drawings

[0010]

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Mode for Carrying Out the Invention

[0011] Hereinafter, a liquid crystal display device according to an embodiment will be described with reference to the drawings.

[0012] <Embodiment 1> With reference to FIGS. 1 to 15, a liquid crystal display device 10 according to the present embodiment will be described. The liquid crystal display device 10 displays color display elements (characters, images, etc.) by a first liquid crystal display panel 100 and a second liquid crystal display panel 200 which will be described later.

[0013] 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 has a first liquid crystal display panel 100 and a second liquid crystal display panel 200. The backlight 300 is a light source that irradiates light onto the first liquid crystal display panel 100 and the second liquid crystal display panel 200. The display control unit 400 controls the displays of the first liquid crystal display panel 100 and the second liquid crystal display panel 200. In this specification, for ease of understanding, the right direction (the right direction of the paper) of the liquid crystal display device 10 in FIG. 1 is defined as the +X direction, the upward direction (the upward direction of the paper) is defined as the +Y direction, and the direction perpendicular to the +X direction and the +Y direction (the front direction of the paper) is defined as the +Z direction for explanation.

[0014] (Panel unit) 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 observer side (+Z side) and displays color display elements. The second liquid crystal display panel 200 is located on the side opposite to the observer side surface of the first liquid crystal display panel 100 (the back side of the first liquid crystal display panel 100) and overlaps the first liquid crystal display panel 100. Also, the second liquid crystal display panel 200 displays monochrome display elements.

[0015] (First liquid crystal display panel) The first liquid crystal display panel 100 is, for example, a known transmissive horizontal electric field type liquid crystal display panel. The first liquid crystal display panel 100 is driven by an active matrix using TFTs (Thin Film Transistors).

[0016] As shown in FIG. 2, the first liquid crystal display panel 100 has first main pixels 102 arranged in a matrix. The first main pixel 102 is formed by a red pixel 104R that emits red light, a green pixel 104G that emits green light, and a blue pixel 104B that emits blue light, which are defined in a V shape by a black matrix BM. In some cases, the red pixel 104R, the green pixel 104G, and the blue pixel 104B may be collectively referred to as sub-pixels 104.

[0017] The sub-pixel 104 is divided into two domains 104a and 104b with different rotational directions of the first liquid crystal 130. The domain 104a and the domain 104b are defined by the black matrix BM.

[0018] As shown in FIG. 3, the first liquid crystal display panel 100 includes a first TFT substrate 110, a first counter substrate 120, a first liquid crystal 130, a first polarizing plate 132, a second polarizing plate 134, and a first driver circuit 136. The first TFT substrate 110 and the first counter substrate 120 sandwich the first liquid crystal 130. The first polarizing plate 132 is provided on the first TFT substrate 110, and the second polarizing plate 134 is provided on the first counter substrate 120.

[0019] The first TFT substrate 110 is, for example, a glass substrate. On the main surface 110a of the first TFT substrate 110 on the side of the first liquid crystal 130, a TFT for selecting the sub-pixel 104, a common electrode, a pixel electrode, an alignment film for aligning the first liquid crystal 130, etc. are provided (none of which are shown).

[0020] Furthermore, a plurality of common wirings, a plurality of signal wirings, and a plurality of scanning wirings are formed on the main surface 110a of the first TFT substrate 110 (none of which are shown). The common wiring supplies a common potential to the common electrode that applies a voltage to the first liquid crystal 130. The signal wiring supplies a voltage to the pixel electrode that applies a voltage to the first liquid crystal 130 via the TFT. The signal wiring extends in the Y direction and bends along the V shape of the sub-pixel 104. The scanning wiring supplies a voltage for operating the TFT. The scanning wiring extends linearly in the X direction. The sub-pixel 104 is surrounded by the signal wiring and the scanning wiring, and the TFT is provided at the intersection of the scanning wiring and the signal wiring. The first polarizing plate 132 is provided on the main surface 110b of the first TFT substrate 110 opposite to the main surface 110a.

[0021] As shown in FIG. 3, the first counter substrate 120 faces the first TFT substrate 110 and is bonded to the first TFT substrate 110 by a sealing material 138. The first counter substrate 120 is, for example, a glass substrate. On the main surface 120a of the first counter substrate 120 on the side of the first liquid crystal 130, a color filter 122, a black matrix BM, an alignment film for aligning the first liquid crystal 130, and the like are provided. The color filter 122 is, for example, a stripe-shaped 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. Each of the red color filter, the green color filter, and the blue color filter of the color filter 122 is surrounded by the black matrix BM and corresponds to each of the red pixel 104R, the green pixel 104G, and the blue pixel 104B. As shown in FIG. 2, the black matrix BM defines the first main pixel 102, the sub-pixels 104, and the domains 104a, 104b. A second polarizing plate 134 is provided on the main surface 120b of the first counter substrate 120 opposite to the main surface 120a. In FIG. 3, for ease of understanding, the black matrix BM, the alignment film, and the like are omitted.

[0022] As shown in FIG. 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 the alignment film. Further, when a voltage is applied to the first liquid crystal 130, it rotates in the plane parallel to the main surface 110a of the first TFT substrate 110.

[0023] The first polarizing plate 132 is provided on the main surface 110b of the first TFT substrate 110, and the second polarizing plate 134 is provided on the main surface 120b of the first counter substrate 120. Either one of the transmission axes of the first polarizing plate 132 and the second polarizing plate 134 is arranged parallel to the alignment direction of the first liquid crystal 130, and the transmission axes of the first polarizing plate 132 and the second polarizing plate 134 are orthogonal to each other. The first polarizing plate 132 is bonded to the second counter substrate 220 of the second liquid crystal display panel 200 described later by an adhesive layer 150 having light transmittance. The adhesive layer 150 is, for example, OCA (Optical Clear Adhesive).

[0024] 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 wiring, the signal wiring, and the common wiring based on the color signals supplied from the display control unit 400.

[0025] (Second Liquid Crystal Display Panel) As shown in FIG. 3, the second liquid crystal display panel 200 is located on the back side (-Z side) of the first liquid crystal display panel 100 and is bonded to the first liquid crystal display panel 100 by the adhesive layer 150. The second liquid crystal display panel 200 displays monochrome display elements.

[0026] In the present embodiment, the second liquid crystal display panel 200 is a transmissive horizontal electric field type liquid crystal display panel using positive type liquid crystal. The second liquid crystal display panel 200 is driven by an active matrix by a switching element 240 described later. As shown in FIG. 4, the second liquid crystal display panel 200 has second main pixels 202 arranged in a matrix. In the present embodiment, one second main pixel 202 of the second liquid crystal display panel 200 corresponds to 16 (4×4) first main pixels 102 of the first liquid crystal display panel 100. That is, one second main pixel 202 of the second liquid crystal display panel 200 emits light to 16 first main pixels 102 of the first liquid crystal display panel 100. In FIG. 4, the scanning wiring GL and the signal wiring DL are shown by broken lines. In the following figures, the scanning wiring GL and the signal wiring DL may be shown by broken lines or solid lines.

[0027] As shown in FIG. 3, the second liquid crystal display panel 200 includes a second TFT substrate 210, a second counter substrate 220, a second liquid crystal 230, a third polarizing plate 232, and a second driver circuit 236. The second TFT substrate 210 and the second counter substrate 220 sandwich the second liquid crystal 230. The third polarizing plate 232 is provided on the second TFT substrate 210. In this embodiment, the first polarizing plate 132 of the first liquid crystal display panel 100 also serves as the polarizing plate on the light-emitting side of the second liquid crystal display panel 200. Further, the second liquid crystal display panel 200 of this embodiment does not include a color filter.

[0028] The second TFT substrate 210 is, for example, a glass substrate. On the main surface 210a of the second TFT substrate 210 on the side of the second liquid crystal 230, a plurality of scanning wirings GL, a plurality of signal wirings DL, a common wiring (not shown), a switching element 240, a pixel electrode 250, and a common electrode CE of the second main pixel 202, an alignment film (not shown) for aligning the second liquid crystal 230, etc., which will be described later, are formed. The common wiring supplies a common potential to the common electrode CE that applies a voltage to the second liquid crystal 230. The signal wiring DL supplies a voltage to the pixel electrode 250 that applies a voltage to the second liquid crystal 230 via the switching element 240. The scanning wiring GL supplies a voltage for operating the switching element 240. The third polarizing plate 232 is provided on the main surface 210b of the second TFT substrate 210 opposite to the main surface 210a.

[0029] In this embodiment, the scanning wiring GL forms a first light-shielding pattern 260, which will be described later, and the signal wiring DL forms a second light-shielding pattern 270. The configurations of the scanning wiring GL, the signal wiring DL, the second main pixel 202 (the switching element 240, the common electrode CE, and the pixel electrode 250), etc. will be described later.

[0030] The second counter substrate 220 faces the second TFT substrate 210 and is bonded to the second TFT substrate 210 by a sealing material 238. The second counter substrate 220 is, for example, a glass substrate. An alignment film (not shown) for aligning the second liquid crystal 230 is provided on the main surface 220a of the second counter substrate 220 on the second liquid crystal 230 side. An adhesive layer 150 is provided on the main surface 220b of the second counter substrate 220 opposite to the main surface 220a. The second counter substrate 220 is attached to the first liquid crystal display panel 100 (the first polarizing plate 132) via the adhesive layer 150.

[0031] The second liquid crystal 230 is sandwiched between the second TFT substrate 210 and the second counter 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 the alignment film. The second liquid crystal 230 rotates in the plane parallel to the main surface 210a of the second TFT substrate 210 when a voltage is applied.

[0032] The third polarizing plate 232 is provided on the main surface 210b of the second TFT substrate 210. The transmission axis of the third polarizing plate 232 is arranged parallel to the alignment direction of the second liquid crystal 230. Note that the transmission axis of the third polarizing plate 232 and the transmission axis of the first polarizing plate 132 (the polarizing plate on the light-emitting side of the second liquid crystal display panel 200) of the first liquid crystal display panel 100 are orthogonal, and the second liquid crystal display panel 200 operates in a normally black mode.

[0033] 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 wiring GL, the signal wiring DL, and the common wiring based on the monochrome signal supplied from the display control unit 400.

[0034] First, with reference to FIGS. 4 to 6, the scanning wiring GL, the signal wiring DL, the first light-shielding pattern 260, and the second light-shielding pattern 270 will be described.

[0035] The scanning wiring GL and the first light-shielding pattern 260 will be described. The scanning wiring GL has light-shielding properties and is formed of a metal (such as aluminum (Al), molybdenum (Mo), etc.). As shown in FIGS. 4 and 5, the scanning wiring GL extends in the X direction and is arranged in the Y direction. Also, a pair of adjacent scanning wirings GL form a first light-shielding pattern 260 that extends in the X direction and has light-shielding properties. The first light-shielding pattern 260 is repeatedly arranged in the Y direction. Here, the light-shielding property means blocking at least a part of the light incident from the backlight 300. Also, in the present embodiment, the X direction corresponds to a predetermined direction in the first light-shielding pattern 260 (scanning wiring GL).

[0036] One of the pair of adjacent scanning wirings GL (hereinafter also referred to as the first light-shielding line 262) has a first inclined portion 262a, a second inclined portion 262b, and a first flat portion 262c, as shown in FIG. 5. The first inclined portion 262a is inclined at an acute angle in the counterclockwise direction with respect to the +X direction, and the second inclined portion 262b is inclined at an acute angle in the direction opposite to the first inclined portion 262a (clockwise direction) 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.

[0037] The other scanning wiring GL of the pair of adjacent scanning wirings GL (hereinafter also referred to as the second light-shielding line 264) is line-symmetric with one scanning wiring GL (the 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 in the clockwise direction 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 in the direction opposite to the third inclined portion 264a (counterclockwise direction) with respect to the +X direction. 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.

[0038] In this embodiment, the first light-shielding line 262 has a first inclined portion 262a that is inclined at an acute angle in the counterclockwise direction with respect to the +X direction, and a second inclined portion 262b that is inclined at an acute angle in the direction opposite to the first inclined portion 262a with respect to the +X direction. The first light-shielding line 262 and the second light-shielding line 264 adjacent to the first light-shielding line 262 are in a line-symmetric 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 (interval 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 (interval L2). Furthermore, the distances (intervals L3 and L4) between 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 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 the spatial frequencies in the second liquid crystal display panel 200 and the first liquid crystal display panel 100 can be suppressed, and moire of the liquid crystal display device 10 can be suppressed.

[0039] Next, the signal wiring DL and the second light-shielding pattern 270 will be described. Similar to the scanning wiring GL, the signal wiring DL has light-shielding properties and is formed of a metal (such as aluminum (Al), molybdenum (Mo), etc.). As shown in FIGS. 4 and 5, the signal wiring DL extends in the Y direction and is arranged in the X direction. Also, a pair of adjacent signal wirings DL form a second light-shielding pattern 270 that extends in the Y direction and has light-shielding properties. In this embodiment, the Y direction corresponds to a predetermined direction in the second light-shielding pattern 270 (signal wiring DL).

[0040] One of the pair of adjacent signal wirings DL (hereinafter also referred to as the third light-shielding line 272) has a fifth inclined portion 272a and a sixth inclined portion 272b as shown in FIG. 5. The fifth inclined portion 272a is inclined at an acute angle in the counterclockwise direction with respect to the +Y direction. The sixth inclined portion 272b is inclined at an acute angle in the direction opposite to the fifth inclined portion 272a (clockwise direction) with respect to the +Y direction.

[0041] Of the pair of adjacent signal wirings DL, the other signal wiring DL (hereinafter also referred to as the fourth light-shielding line 274) is line-symmetrical with 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 in the clockwise direction 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 direction opposite to the seventh inclined portion 274a (counterclockwise direction) with respect to the +Y direction. Note that the third light-shielding line 272 and the fourth light-shielding line 274 of the second light-shielding pattern 270 respectively correspond to the first light-shielding line and the second light-shielding line of the light-shielding pattern, and the fifth inclined portion 272a and the sixth inclined portion 272b of the third light-shielding line 272 respectively correspond to the first inclined portion and the second inclined portion of the first light-shielding line.

[0042] In the present embodiment, the third light-shielding line 272 has a fifth inclined portion 272a inclined at an acute angle in the counterclockwise direction with respect to the +Y direction and a sixth inclined portion 272b inclined at an acute angle in the direction opposite to the fifth inclined portion 272a with respect to the +Y direction, and 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-symmetrical 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. Thereby, even when the second liquid crystal display panel 200 and the first liquid crystal display panel 100 are overlapped, interference of the spatial frequencies in the second liquid crystal display panel 200 and the first liquid crystal display panel 100 can be suppressed, and moire of the liquid crystal display device 10 can be suppressed.

[0043] Referring to FIG. 6, the overlap between the first light-shielding pattern 260, the second light-shielding pattern 270, and the first main pixel 102 of the first liquid crystal display panel 100 will be described. FIG. 6 shows the first light-shielding pattern 260 (scanning wiring GL), the second light-shielding pattern 270 (signal wiring DL), and the first main pixel 102 of the first liquid crystal display panel 100 corresponding to one second main pixel 202 of the second liquid crystal display panel 200. In the present embodiment, as will be described later, one first main pixel 102 of the first liquid crystal display panel 100 is driven by voltages (signals) from a pair of adjacent scanning wirings GL and a pair of adjacent signal wirings DL.

[0044] In the first light-shielding pattern 260 extending in the X direction, as shown in FIG. 6, 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 a plurality of sub-pixels 104 (104R, 104G, 104B) of different colors on 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 slightly decreases, and the first main pixel 102 having the sub-pixels 104 overlapping with the first light-shielding pattern 260 exhibits a color slightly different from the color to be displayed. However, since sub-pixels 104 that cause the same degree of luminance reduction are located close to each other, the luminance of the sub-pixels 104 is averaged for an observer observing the liquid crystal display device 10, and the observer recognizes the luminance of the plurality of sub-pixels 104 with reduced luminance as the same luminance gradation. Therefore, as for the entire display of the liquid crystal display device 10, it is possible to suppress the recognition of color moiré by the observer. Note that 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.

[0045] 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 a plurality of sub-pixels 104 (104R, 104B) of different colors on the first liquid crystal display panel 100. As a result, similarly to the first light-shielding pattern 260, the first main pixel 102 having the sub-pixels 104 overlapping with the second light-shielding pattern 270 exhibits a color slightly different from the color to be displayed. However, the color exhibited by the first main pixel 102 having the sub-pixels 104 overlapping with the second light-shielding pattern 270 and the color exhibited by the first main pixel 102 located in the vicinity of the first main pixel 102 having the sub-pixels 104 overlapping with the second light-shielding pattern 270 are recognized as different colors by the observer, and the chroma of the synthesized color also decreases. Therefore, as for the entire display of the liquid crystal display device 10, it is possible to suppress the recognition of color moiré by the observer.

[0046] Next, with reference to FIGS. 7 to 14, the scanning wiring GL (the first light-shielding line 262 and the second light-shielding line 264), the signal wiring DL (the third light-shielding line 272 and the fourth light-shielding line 274), the switching element 240 of the second main pixel 202, the pixel electrode 250, and the common electrode CE will be described. FIG. 7 is a plan view showing the scanning wiring GL, the signal wiring DL, the switching element 240, and the pixel electrode 250. FIG. 8 is a cross-sectional view showing the switching element 240 and the contact hole CH. In FIG. 7, the common electrode CE is omitted for easy understanding.

[0047] In this embodiment, as shown in FIG. 7, one second main pixel 202 has four switching elements 240 and one pixel electrode 250. One second main pixel 202 is driven by voltages (signals) from a pair of adjacent scanning wirings GL (the first light-shielding line 262 and the second light-shielding line 264) and a pair of adjacent signal wirings DL (the third light-shielding line 272 and the fourth light-shielding line 274).

[0048] As shown in FIG. 8, the scanning wiring GL (the first light-shielding line 262 and the second light-shielding line 264) is formed on the main surface 210a of the second TFT substrate 210 and covered with the first insulating layer 282. The signal wiring DL (the third light-shielding line 272 and the fourth light-shielding line 274) is formed on the first insulating layer 282 and covered with the second insulating layer 284.

[0049] As shown in FIG. 8, the common electrode CE is formed on the second insulating layer 284. The common electrode CE is formed of, for example, ITO (Indium Tin Oxide). The common electrode CE is covered with the third insulating layer 286.

[0050] The four switching elements 240 are respectively provided at the intersections of the scanning wiring GL and the signal wiring DL. As shown in FIGS. 7 and 8, the switching element 240 has a gate electrode 242, a semiconductor layer 244, a source electrode 246, and a drain electrode 248. The switching element 240 is, for example, a TFT element.

[0051] The gate electrode 242 is formed on the main surface 210a of the second TFT substrate 210 integrally with the scanning wiring GL. The gate electrode 242 is covered with the first insulating layer 282, similar to the scanning wiring GL. The semiconductor layer 244 is provided in an island shape on the gate electrode 242 via the first insulating layer 282. The semiconductor layer 244 is formed of, for example, amorphous silicon. The source electrode 246 is formed integrally with the signal wiring DL. The drain electrode 248 extends from above the semiconductor layer 244 along the scanning wiring GL and is connected to the pixel electrode 250. As shown in FIG. 8, the drain electrode 248 is connected to the pixel electrode 250 via a contact hole CH penetrating through 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). Further, the semiconductor layer 244, the source electrode 246, and the drain electrode 248 are covered with the second insulating layer 284 as shown in FIG. 8.

[0052] As shown in FIG. 8, the first insulating layer 282 covers the scanning wiring GL and the gate electrode 242 of the switching element 240. The second insulating layer 284 covers the semiconductor layer 244, the source electrode 246, and the drain electrode 248 of the switching element 240, and the first insulating layer 282. The third insulating layer 286 covers the common electrode CE and the 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. 7, the pixel electrode 250 is connected to four switching elements 240 (drain electrodes 248). The pixel electrode 250 has a comb shape. As shown in FIG. 8, the pixel electrode 250 is formed on the third insulating layer 286. The pixel electrode 250 is formed of, for example, ITO.

[0054] The pixel electrode 250 has two connection portions 252, a plurality of first tooth portions 254a, and a plurality of second tooth portions 254b. Hereinafter, the first tooth portion 254a and the second tooth portion 254b may be collectively referred to as the tooth portion 254.

[0055] One of the two connection parts 252 extends in the X direction, bends in the same manner as the first light-shielding line 262, and overlaps the first light-shielding line 262. The other of the two connection parts 252 extends in the X direction, bends in the same manner as the second light-shielding line 264, and overlaps the second light-shielding line 264.

[0056] The first tooth part 254a and the second tooth part 254b branch off from the connection part 252 (that is, are directly connected to the connection part 252), extend in opposite directions (+Y direction and -Y direction) with the connection part 252 interposed therebetween, and are acutely inclined in opposite directions with respect to the X direction (a predetermined direction). Specifically, as shown in FIG. 9, the first tooth part 254a extends in the +Y direction and is inclined at an acute angle (inclination angle θ1) in the counterclockwise direction with respect to the +X direction. The second tooth part 254b extends in the -Y direction and is inclined at an acute angle (inclination angle θ2) in the clockwise direction with respect to the +X direction. In the present embodiment, as shown in FIGS. 7 and 9, the second tooth part 254b extending from the connection part 252 overlapping the first light-shielding line 262 and the first tooth part 254a extending from the connection part 252 overlapping the second light-shielding line 264 are connected, and a bent part 256 where the tooth part 254 bends is formed at the center of the second main pixel 202.

[0057] In the present embodiment, by shifting the position P where the first tooth part 254a and the second tooth part 254b branch off from the connection part 252 at the inclined part 252a with respect to the X direction of the connection part 252 (in the example of FIG. 9, by a distance D1 in the X direction), the connection part 252 is overlapped with the first light-shielding line 262 or the second light-shielding line 264, the interval LL1 between the first tooth parts 254a and the interval LL2 between the second tooth parts 254b are made equal, and further, the inclination angle θ1 of the first tooth part 254a and the inclination angle θ2 of the second tooth part 254b are made equal. Since the interval LL1 and the interval LL2 are made equal and the inclination angle θ1 and the inclination angle θ2 are made equal, the electric field E applied to the second liquid crystal 230 by the first tooth part 254a and the electric field E applied to the second liquid crystal 230 by the second tooth part 254b can be made equal, and the optical characteristics can be made uniform within the second main pixel 202. Note that the interval LL1 refers to the shortest distance between the opposing side surfaces of the adjacent first tooth parts 254a, and the interval LL2 refers to the shortest distance between the opposing side surfaces of the adjacent second tooth parts 254b.

[0058] Here, referring to FIG. 10, the dark lines that occur when a voltage is applied to the second liquid crystal 230 using a pixel electrode having a comb tooth shape will be described. In the normally black mode, when a voltage is applied to the second liquid crystal 230 oriented in the Y direction by a pixel electrode having tooth portions extending and bent in the Y direction, as shown in FIG. 10, at the bent portions of the tooth portions, the electric field E in the X direction acts on the liquid crystal molecules 230M, so the liquid crystal molecules 230M do not rotate, and thus a dark line DkL1 extending in the X direction due to the bent portions is generated. Also, in the vicinity of the connecting portions connecting the tooth portions, since the electric field E in the Y direction acts on the liquid crystal molecules 230M, a dark line DkL2 extending in the X direction due to the connecting portions is generated. Further, even at the boundary portions of adjacent pixel electrodes, since the electric field E in the Y direction acts on the liquid crystal molecules 230M, a dark line DkL3 extending in the X direction due to the boundary portions is generated.

[0059] In the present embodiment, as shown in FIG. 11, when a voltage is applied to the second liquid crystal 230, within the second main pixel 202, one dark line DkL1 extending in the X direction due to the bent portion 256 is generated. Also, two dark lines DkL2 extending in the X direction due to the connecting portions 252 are generated. Further, the first light-shielding line 262 and the second light-shielding line 264 also become dark lines extending in the X direction. However, since the connecting portion 252 of the pixel electrode 250 overlaps with the first light-shielding line 262 or the second light-shielding line 264 as described above, the dark line DkL2 extending in the X direction due to the first light-shielding line 262 and the connecting portion 252 overlapping with the first light-shielding line 262 becomes one dark line extending in the X direction. Also, the dark line DkL2 extending in the X direction due to the second light-shielding line 264 and the connecting portion 252 overlapping with the second light-shielding line 264 becomes one dark line extending in the X direction. Therefore, in the pixel electrode 250 of the present embodiment, as the dark lines extending in the X direction within the second main pixel 202, only three dark lines are generated: the dark line DkL1 due to the bent portion 256, the dark line formed by the overlapping of the dark line DkL2 due to the first light-shielding line 262 and the connecting portion 252, and the dark line formed by the overlapping of the dark line DkL2 due to the second light-shielding line 264 and the connecting portion 252.

[0060] On the other hand, when a pixel electrode in which a bent tooth portion branches from a connection portion in the +Y direction and the -Y direction and the connection portion does not overlap with either the first light-shielding line or the second light-shielding line is applied to this embodiment instead of the pixel electrode 250 (hereinafter, Comparative Example 1), as shown in FIG. 12, a dark line DkL1 extending in the X direction due to two bent portions 256, a dark line DkL2 extending in the X direction due to one connection portion 252, the first light-shielding line 262, and the second light-shielding line 264 result in five dark lines. In FIGS. 11 and 12, the switching element 240 is omitted. In the following figures as well, the switching element 240 may be omitted.

[0061] As described above, in this embodiment, since the connection portion 252 of the pixel electrode 250 overlaps with the first light-shielding line 262 or the second light-shielding line 264, it is possible to reduce the dark lines generated when a voltage is applied to the second liquid crystal 230.

[0062] Next, the relationship between the angle φ of the direction in which the observer views the liquid crystal display device 10 and the luminance Lu of the liquid crystal display device 10 in the region corresponding to one second main pixel 202 in the state of displaying white will be described. The viewing direction is, as shown in FIG. 13, a direction closer to the +Y side from the front, and the angle φ is the angle with respect to the +Z direction.

[0063] FIG. 14 shows the relationship between the angle φ of the viewing direction obtained by simulation and the luminance Lu of the liquid crystal display device 10 and the luminance Lu of Comparative Example 1 in the state of displaying white. The luminance Lu of Comparative Example 1 is the luminance Lu of a liquid crystal display device including the pixel electrode of Comparative Example 1 described above instead of the pixel electrode 250. As shown in FIG. 14, in the liquid crystal display device 10, the change in luminance Lu due to the angle φ of the viewing direction is small, and moire can be suppressed. That is, the liquid crystal display device 10 can reduce the dark lines generated when a voltage is applied to the second liquid crystal 230 and suppress moire.

[0064] (Backlight) As shown in FIG. 1, the backlight 300 is disposed on the back side (-Z side) of the second liquid crystal display panel 200. The backlight 300 is, for example, a direct-lit backlight. The backlight 300 includes a white LED (Light emitting diode) element, a reflective sheet, a diffusion sheet, etc. (none of which are shown).

[0065] (Display control unit) The display control unit 400 controls the displays of the first liquid crystal display panel 100 and the second liquid crystal display panel 200. As shown in FIG. 15, the display control unit 400 includes a data distribution unit 410, a first signal generation unit 420, a second luminance signal generation unit 430, and a second signal generation unit 440.

[0066] The data distribution unit 410 distributes the input data (data representing display elements) to the first signal generation unit 420 and the second luminance signal generation unit 430.

[0067] The first signal generation unit 420 generates display elements of the color to be displayed on the first liquid crystal display panel 100 from the input data distributed from the data distribution unit 410. Specifically, the first tone conversion unit 422 of the first signal generation unit 420 performs tone conversion to convert the distributed input data into color data having luminance-tone characteristics suitable for the first liquid crystal display panel 100. For the conversion of the data, for example, a look-up table with a preset input-output relationship is used. The first signal generation unit 420 transmits a color signal representing the generated display elements of the color to the first driver circuit 136 of the first liquid crystal display panel 100.

[0068] The second luminance signal generation unit 430 generates a luminance signal for generating a monochrome display element to be displayed on the second liquid crystal display panel 200 from the input data distributed by the data distribution unit 410. The second luminance signal generation unit 430 obtains, for example, the average value, the mode value, the minimum value, the maximum value, etc. of the red gradation value, the green gradation value, and the blue gradation value in the 16 first main pixels 102 of the first liquid crystal display panel 100 where the light emitted from one second main pixel 202 of the second liquid crystal display panel 200 is incident, and determines the luminance level of one second main pixel 202 of the second liquid crystal display panel 200. The obtained luminance level may be a gradation value. The second luminance signal generation unit 430 transmits a luminance signal representing the obtained luminance level to the second signal generation unit 440.

[0069] The second signal generation unit 440 generates a monochrome display element to be displayed on the second liquid crystal display panel 200 based on the luminance signal transmitted from the second luminance signal generation unit 430. The second signal generation unit 440 generates, for example, a monochrome display element subjected to averaging processing and gradation conversion. Specifically, the arithmetic unit 442 of the second signal generation unit 440 averages the luminance levels of the second main pixels 202 located within a predetermined distance of the second main pixel 202 of interest by, for example, weighted averaging based on the distance from the second main pixel 202 of interest. Thereby, the second signal generation unit 440 can generate a monochrome image with blurred edges. Further, the second gradation conversion unit 444 of the second signal generation unit 440 generates monochrome data having luminance-gradation characteristics suitable for the second liquid crystal display panel 200. The configuration of the second gradation conversion unit 444 is the same as that of the first gradation conversion unit 422 of the first signal generation unit 420.

[0070] The monochrome signal transmitted to the second liquid crystal display panel 200 is delayed with respect to the color signal transmitted to the first liquid crystal display panel 100 by calculation, averaging processing, etc. of the luminance level performed by the second luminance signal generation unit 430. Therefore, the display control unit 400 includes a synchronization circuit (not shown) in order to synchronize the output of the monochrome signal and the color signal. By the synchronization circuit, the monochrome display elements corresponding to the color display elements of the first liquid crystal display panel 100 are displayed on the second liquid crystal display panel 200, so that appropriate color display elements are displayed on the liquid crystal display device 10.

[0071] The display control unit 400 is composed of a CPU (Central Processing Unit), a memory, etc. The functions of the display control unit 400 are realized, for example, when the CPU executes a program stored in the memory.

[0072] As described above, since the connection portion 252 of the pixel electrode 250 of the second liquid crystal display panel 200 overlaps the first light-shielding line 262 or the second light-shielding line 264 of the second liquid crystal display panel 200, when a voltage is applied to the second liquid crystal 230, the dark lines generated inside the second main pixel 202 of the second liquid crystal display panel 200 can be reduced, and moiré of the liquid crystal display device 10 can be suppressed.

[0073] Also, since the first light-shielding pattern 260 of the second liquid crystal display panel 200 is formed from the first light-shielding line 262 having the first inclined portion 262a, the second inclined portion 262b, and the first flat portion 262c, and the second light-shielding line 264 that is line-symmetric to the first light-shielding line 262 with respect to the X direction, moiré of the liquid crystal display device 10 can be suppressed. Furthermore, since the second light-shielding pattern 270 of the second liquid crystal display panel 200 is formed from the third light-shielding line 272 having the fifth inclined portion 272a and the sixth inclined portion 272b, and the fourth light-shielding line 274 that is line-symmetric to the third light-shielding line 272 with respect to the Y direction, moiré of the liquid crystal display device 10 can be further suppressed. Generation of color moiré can also be suppressed.

[0074] In addition, when a voltage is applied to the second liquid crystal 230, dark lines generated in the second main pixel 202 of the second liquid crystal display panel 200 can be reduced, so that the aperture ratio (transmittance) of the second main pixel 202 in a state where a voltage is applied to the second liquid crystal 230 can be increased. For example, the aperture ratio of the second main pixel 202 in a state where a voltage is applied to the second liquid crystal 230 is 95.4%. The aperture ratio of the second main pixel 202 having the pixel electrode of Comparative Example 1 described above instead of the pixel electrode 250 in a state where a voltage is applied to the second liquid crystal 230 is 93.9%.

[0075] Furthermore, as described above, since moire of the liquid crystal display device 10 can be suppressed by the pixel electrode 250, the first light-shielding pattern 260, and the second light-shielding pattern 270, by using an adhesive layer 150 with a low haze (high transmittance) for the adhesive layer 150 that bonds the first liquid crystal display panel 100 and the second liquid crystal display panel 200, the transmittance of the liquid crystal display device 10 can be increased.

[0076] <Embodiment 2> In Embodiment 1, the second main pixel 202 has one pixel electrode 250. The second main pixel 202 may have a plurality of pixel electrodes 250.

[0077] Here, the pixel electrode 250 of the second liquid crystal display panel 200 in the present embodiment will be described. Other configurations of the liquid crystal display device 10 in the present embodiment are the same as those of the liquid crystal display device 10 in Embodiment 1.

[0078] In the present embodiment, one second main pixel 202 of the second liquid crystal display panel 200 has four pixel electrodes 250 as shown in FIG. 16. Each of the pixel electrodes 250 has a connection portion 252, a first tooth portion 254a, and a second tooth portion 254b, similar to the pixel electrode 250 in Embodiment 1. The connection portion 252 overlaps the first light-shielding line 262 or the second light-shielding line 264. The first tooth portion 254a and the second tooth portion 254b branch from the connection portion 252, extend in opposite directions across the connection portion 252, and are inclined at an acute angle in opposite directions with respect to the X direction.

[0079] The four pixel electrodes 250 are arranged in two rows and two columns in the X and Y directions, and each of the four pixel electrodes 250 is connected to each of the four switching elements 240. In this embodiment, since the pixel electrodes 250 are arranged in two rows and two columns, instead of the bent portion 256 of Embodiment 1, a boundary portion 258 of the pixel electrode 250 extending in the X direction is formed.

[0080] In this embodiment, as shown in FIG. 17, when a voltage is applied to the second liquid crystal 230, within the second main pixel 202, one dark line DkL3 extending in the X direction due to the boundary portion 258 is generated. Also, similar to Embodiment 1, a dark line DkL2 extending in the X direction due to the two connection portions 252, a dark line extending in the X direction due to the first light-shielding line 262, and a dark line extending in the X direction due to the second light-shielding line 264 are generated. Similar to Embodiment 1, since the connection portion 252 of the pixel electrode 250 overlaps with the first light-shielding line 262 or the second light-shielding line 264, the dark line due to the first light-shielding line 262 and the dark line DkL2 extending in the X direction due to the connection portion 252 overlapping with the first light-shielding line 262 become one dark line extending in the X direction. Also, the dark line due to the second light-shielding line 264 and the dark line DkL2 extending in the X direction due to the connection portion 252 overlapping with the second light-shielding line 264 become one dark line extending in the X direction. Therefore, also in this embodiment, only three dark lines are generated as the dark lines extending in the X direction within the second main pixel 202.

[0081] As described above, also in this embodiment, since the connection portion 252 of the pixel electrode 250 overlaps with the first light-shielding line 262 or the second light-shielding line 264, when a voltage is applied to the second liquid crystal 230, the dark lines generated within the second main pixel 202 of the second liquid crystal display panel 200 can be reduced, and the moire of the liquid crystal display device 10 can be suppressed.

[0082] Also, in this embodiment, the moire of the liquid crystal display device 10 can be suppressed by the first light-shielding pattern 260 and the second light-shielding pattern 270. Furthermore, similar to Embodiment 1, the aperture ratio of the second main pixel 202 and the transmittance of the liquid crystal display device 10 can be increased.

[0083] <Embodiment 3> In Embodiment 2, the connection portion 252 of the pixel electrode 250 overlaps with the first light-shielding line 262 or the second light-shielding line 264. The connection portion 252 of the pixel electrode 250 may overlap with the third light-shielding line 272 or the fourth light-shielding line 274.

[0084] Here, the pixel electrode 250 of the second liquid crystal display panel 200 in the present embodiment will be described. Other configurations of the liquid crystal display device 10 in the present embodiment are the same as those of the liquid crystal display device 10 in Embodiment 1.

[0085] In the present embodiment, one second main pixel 202 of the second liquid crystal display panel 200 has four pixel electrodes 250 as shown in FIG. 18. The four pixel electrodes 250 are arranged in two rows and two columns in the X direction and the Y direction, and each of the four pixel electrodes 250 is connected to each of the four switching elements 240. Each of the pixel electrodes 250 has a connection portion 252, a first tooth portion 254a, and a second tooth portion 254b. In FIG. 18, the switching element 240 is simplified for easy understanding.

[0086] In the present embodiment, the connection portion 252 extends in the Y direction, bends in the same manner as the third light-shielding line 272 or the fourth light-shielding line 274, and overlaps with the third light-shielding line 272 or the fourth light-shielding line 274.

[0087] As shown in FIG. 19, the first tooth portion 254a and the second tooth portion 254b branch off from the connection portion 252, extend in opposite directions (+X direction and -X direction) across the connection portion 252, and are acutely inclined in opposite directions with respect to the Y direction (predetermined direction). Specifically, the first tooth portion 254a extends in the -X direction and is acutely inclined (inclination angle θ1) in the clockwise direction with respect to the +Y direction. The second tooth portion 254b extends in the +X direction and is acutely inclined (inclination angle θ2) in the counterclockwise direction with respect to the +Y direction. In the present embodiment, since the pixel electrodes 250 are arranged in two rows and two columns, and the first tooth portion 254a extends in the -X direction and the second tooth portion 254b extends in the +X direction, a boundary portion 258 of the pixel electrode 250 extending in the Y direction is formed at the center of the second main pixel 202.

[0088] In this embodiment, by shifting the position P where the first tooth portion 254a and the second tooth portion 254b branch from the connection portion 252 (in the example of FIG. 19, the distance D2 in the Y direction), the connection portion 252 is overlapped with the third light-shielding line 272 or the fourth light-shielding line 274, the interval LL1 between the first tooth portions 254a and the interval LL2 between the second tooth portions 254b are made equal, and further, the inclination angle θ1 of the first tooth portion 254a and the inclination angle θ2 of the second tooth portion 254b are made equal. Thereby, similar to Embodiment 1, the optical characteristics can be made uniform within the second main pixel 202.

[0089] In this embodiment, as shown in FIG. 20, when a voltage is applied to the second liquid crystal 230, one dark line DkL3 extending in the Y direction due to the boundary portion 258 is generated within the second main pixel 202. Also, a dark line DkL2 extending in the Y direction due to the two connection portions 252, a dark line extending in the Y direction due to the third light-shielding line 272, and a dark line extending in the X direction due to the fourth light-shielding line 274 are generated. However, since the connection portion 252 of the pixel electrode 250 overlaps with the third light-shielding line 272 or the fourth light-shielding line 274, the dark line due to the third light-shielding line 272 and the dark line DkL2 extending in the Y direction due to the connection portion 252 overlapping with the third light-shielding line 272 become one dark line extending in the Y direction. The dark line due to the fourth light-shielding line 274 and the dark line DkL2 extending in the Y direction due to the connection portion 252 overlapping with the fourth light-shielding line 274 also become one dark line extending in the Y direction. Therefore, only three dark lines are generated as the dark lines extending in the Y direction within the second main pixel 202.

[0090] As described above, since the connection portion 252 of the pixel electrode 250 overlaps with the third light-shielding line 272 or the fourth light-shielding line 274, when a voltage is applied to the second liquid crystal 230, the dark lines generated within the second main pixel 202 of the second liquid crystal display panel 200 can be reduced, and the moiré of the liquid crystal display device 10 can be suppressed.

[0091] Also, in this embodiment as well, the moiré of the liquid crystal display device 10 can be suppressed by the first light-shielding pattern 260 and the second light-shielding pattern 270. Further, similar to Embodiment 1, the aperture ratio of the second main pixel 202 and the transmittance of the liquid crystal display device 10 can be increased.

[0092] <Embodiment 4> In Embodiments 1 to 3, the panel unit 50 of the liquid crystal display device 10 includes a first liquid crystal display panel 100 and a second liquid crystal display panel 200. The panel unit 50 may include a touch panel 610 instead of the first liquid crystal display panel 100. The touch panel 610 corresponds to an element.

[0093] As shown in FIG. 21, the liquid crystal display device 10 of the present embodiment includes a panel unit 50, a backlight 300, and a control unit 500. The panel unit 50 includes a second liquid crystal display panel 200, a touch panel 610, and a cover 620. The backlight 300 is a light source that irradiates light onto the second liquid crystal display panel 200. The control unit 500 controls the display of the second liquid crystal display panel 200. Further, the control unit 500 detects the position where an object (for example, a pen) contacts from the capacitance formed between the first electrode 612 and the second electrode 614 of the touch panel 610, which will be described later, and the object.

[0094] The touch panel 610 of the panel unit 50 is a capacitive touch panel. The touch panel 610 is provided on the display surface side (+Z side) of the second liquid crystal display panel 200 via an adhesive layer (not shown).

[0095] As shown in FIG. 22, the touch panel 610 includes a light-transmissive substrate 611, a plurality of first electrodes 612, an insulating layer 613, and a plurality of second electrodes 614.

[0096] The light-transmissive substrate 611 of the touch panel 610 is, for example, a glass substrate. The light-transmissive substrate 611 has a main surface 611a.

[0097] The first electrodes 612 of the touch panel 610 are each provided on the main surface 611a of the light-transmissive substrate 611. The first electrode 612 has a rectangular shape and extends in the X direction. Further, the first electrodes 612 are arranged at equal intervals in the Y direction. Each of the first electrodes 612 is electrically connected to the control unit 500 via a wiring (not shown).

[0098] The insulating layer 613 of the touch panel 610 is provided on the first electrode 612 and insulates the first electrode 612 and the second electrode 614. The insulating layer 613 is, for example, a silicon oxide thin film.

[0099] The second electrodes 614 of the touch panel 610 are each provided on the insulating layer 613. The second electrode 614 has a rectangular shape, extends in the Y direction, and intersects the first electrode 612. Each of the second electrodes 614 is electrically connected to the control unit 500 via a wiring (not shown).

[0100] The first electrode 612 and the second electrode 614 are formed of, for example, ITO. The first electrode 612 and the second electrode 614 form a capacitance with an object. The position where the object contacts is detected from the formed capacitance by the control unit 500.

[0101] The cover 620 of the panel unit 50 is formed in a flat plate shape from glass. As shown in FIG. 21, the cover 620 is located on the +Z side of the touch panel 610 and protects the touch panel 610. The cover 620 is attached to the touch panel 610 by an adhesive layer (not shown).

[0102] The second liquid crystal display panel 200 of the present embodiment displays color display elements. The second liquid crystal display panel 200 of the present embodiment has second main pixels 202 arranged in a matrix as shown in FIG. 23. The second main pixel 202 is formed of a red pixel 204R that emits red light, a green pixel 204G that emits green light, and a blue pixel 204B that emits blue light, which are defined by a black matrix BM. In the present embodiment, a color filter (not shown) and a black matrix BM whose stripe direction is the Y direction are formed on the second counter substrate 220 of the second liquid crystal display panel 200. Further, a polarizing plate on the light emitting side is provided on the main surface 220b of the second counter substrate 220. In some cases, the red pixel 204R, the green pixel 204G, and the blue pixel 204B may be collectively referred to as a sub-pixel 204.

[0103] In the second liquid crystal display panel 200 of the present embodiment, the configurations of the scanning wiring GL (the first light-shielding pattern 260, the first light-shielding line 262, the second light-shielding line 264), the signal wiring DL (the second light-shielding pattern 270, the third light-shielding line 272, the fourth light-shielding line 274), the pixel electrode 250, etc. are the same as those in Embodiment 2. The 2×2 sub-pixels 204 in the present embodiment correspond to one second main pixel 202 in Embodiment 2. For example, in FIG. 23, two red pixels 204R arranged in the Y direction and a green pixel 204G arranged in the Y direction correspond to one second main pixel 202 in Embodiment 2.

[0104] As shown in FIG. 24, the pixel electrodes 250 of the present embodiment are arranged one by one for each of the sub-pixels 204. The pixel electrode 250 of the present embodiment has a connection portion 252, a first tooth portion 254a, and a second tooth portion 254b, similar to the pixel electrode 250 of Embodiment 2, and the connection portion 252 overlaps the first light-shielding line 262 or the second light-shielding line 264.

[0105] When a voltage is applied to the second liquid crystal 230, similar to Embodiment 2, one dark line extending in the X direction formed by the dark line due to the first light-shielding line 262 and the dark line DkL2 due to the connection portion 252, one dark line extending in the X direction formed by the dark line due to the second light-shielding line 264 and the dark line DkL2 due to the connection portion 252, and a dark line DkL3 extending in the X direction due to the boundary portion 258 are generated. As shown in FIG. 25, the dark line DkL3 overlaps the black matrix BM. Therefore, only one dark line is generated as the dark line extending in the X direction among the sub-pixels 204. In FIG. 25, for ease of understanding, the portion of the pixel electrode 250 overlapping the black matrix BM is also shown by a solid line.

[0106] On the other hand, when a pixel electrode obtained by dividing the pixel electrode of Comparative Example 1 into 2×2 is applied to the present embodiment instead of the pixel electrode 250 of the present embodiment (hereinafter, Comparative Example 2), as shown in FIG. 26, two dark lines (the dark line due to the first light-shielding line 262 or the second light-shielding line 264 and the dark line DkL1 due to the bent portion) are generated as the dark lines extending in the X direction among the sub-pixels 204.

[0107] As described above, also in this embodiment, since the connection portion 252 of the pixel electrode 250 overlaps with the first light-shielding line 262 or the second light-shielding line 264, when a voltage is applied to the second liquid crystal 230, dark lines generated in the sub-pixels 204 of the second liquid crystal display panel 200 can be reduced. Thereby, moiré of the liquid crystal display device 10 due to the first electrode 612 of the touch panel 610 and the dark lines of the second liquid crystal display panel 200 can be suppressed.

[0108] Also in this embodiment, moiré of the liquid crystal display device 10 can be suppressed by the first light-shielding pattern 260 and the second light-shielding pattern 270. Furthermore, the aperture ratio of the second main pixel 202 and the transmittance of the liquid crystal display device 10 can be increased.

[0109] <Embodiment 5> In Embodiment 4, the panel portion 50 of the liquid crystal display device 10 includes the second liquid crystal display panel 200 and the touch panel 610. The panel portion 50 of the liquid crystal display device 10 may include a liquid crystal lens 630 instead of the touch panel 610. The liquid crystal lens 630 corresponds to an element.

[0110] The liquid crystal display device 10 of this embodiment displays planar characters, images, etc. and three-dimensional characters, images, etc. As shown in FIG. 27, the liquid crystal display device 10 of this embodiment includes a panel portion 50, a backlight 300, and a control unit 500. The panel portion 50 includes a second liquid crystal display panel 200 and a liquid crystal lens 630. The backlight 300 is a light source that irradiates light onto the second liquid crystal display panel 200. The control unit 500 controls the display of the second liquid crystal display panel 200. Also, the control unit 500 controls the liquid crystal lens 630.

[0111] The liquid crystal lens 630 of the panel portion 50 is provided on the display surface side (+Z side) of the second liquid crystal display panel 200 via an adhesive layer (not shown). The liquid crystal lens 630 switches between a state of functioning as a lens and a state of not functioning as a lens according to the applied voltage state. In this embodiment, the liquid crystal lens 630 functions as a lenticular lens array when a voltage is applied.

[0112] As shown in FIG. 28, the liquid crystal lens 630 includes a first light-transmissive substrate 632, a second light-transmissive substrate 634, and a liquid crystal 636. The first light-transmissive substrate 632 and the second light-transmissive substrate 634 sandwich the liquid crystal 636.

[0113] The first light-transmissive substrate 632 is, for example, a glass substrate. The first light-transmissive substrate 632 is attached to the second liquid crystal display panel 200 by an adhesive layer (not shown).

[0114] On the main surface 632a of the first light-transmissive substrate 632 on the liquid crystal 636 side, a comb-shaped third electrode 642, a fourth electrode 644, an alignment film 646, and a light-shielding portion 648 are provided. The third electrode 642 and the fourth electrode 644 are formed of, for example, ITO. The third electrode 642 and the fourth electrode 644 are connected to the control unit 500 via wirings (not shown).

[0115] As shown in FIG. 29, the third electrode 642 has a plurality of tooth portions 642a extending in the -Y direction. The fourth electrode 644 has a plurality of tooth portions 644a extending in the +Y direction. The tooth portions 642a of the third electrode 642 and the tooth portions 644a of the fourth electrode 644 are alternately arranged at equal intervals along the X direction. Further, in the present embodiment, when the liquid crystal display device 10 is viewed in plan, one pixel column of the second liquid crystal display panel 200 is located in the region between adjacent tooth portions 642a and tooth portions 644a.

[0116] Returning to FIG. 28, the alignment film 646 is formed of, for example, polyimide. The alignment film 646 covers the third electrode 642, the fourth electrode 644, and the main surface 632a of the first light-transmissive substrate 632. The alignment film 646 aligns the liquid crystal 636 in the X direction.

[0117] The light-shielding portion 648 is provided on the main surface 632b of the first light-transmissive substrate 632 opposite to the main surface 632a. The light-shielding portion 648 extends in the Y direction and overlaps the tooth portions 644a of the fourth electrode 644. The light-shielding portion 648 blocks light emitted from the second liquid crystal display panel 200 and incident on the region where the alignment of the liquid crystal 636 located on the tooth portions 644a is disturbed.

[0118] Returning to FIG. 28, the second light-transmissive substrate 634 is, for example, a glass substrate. On the main surface 634a of the second light-transmissive substrate 634 on the liquid crystal 636 side, a counter electrode 652 and an alignment film 654 are provided. The counter electrode 652 is formed, for example, in a rectangular shape from ITO on the main surface 634a of the second light-transmissive substrate 634. The counter electrode 652 faces the tooth portions 642a of the third electrode 642 and the tooth portions 644a of the fourth electrode 644. The counter electrode 652 is connected to the control unit 500 in the same manner as the third electrode 642 and the fourth electrode 644.

[0119] The alignment film 654 is formed, for example, from polyimide. The alignment film 654 covers the counter electrode 652 and the main surface 634a of the second light-transmissive substrate 634, and aligns the liquid crystal 636 in the X direction.

[0120] The liquid crystal 636 is sandwiched between the first light-transmissive substrate 632 and the second light-transmissive substrate 634. The liquid crystal 636 is a positive nematic liquid crystal. The liquid crystal 636 is homogeneously aligned in the X direction in a state where no voltage is applied.

[0121] For example, when the control unit 500 controls the potentials of the third electrode 642, the fourth electrode 644, and the counter electrode 652 to be the ground potential, no voltage is applied to the liquid crystal 636, so the liquid crystal 636 maintains homogeneous alignment. In a state where the liquid crystal 636 maintains homogeneous alignment, the liquid crystal lens 630 does not function as a lenticular lens array. When the liquid crystal lens 630 does not function as a lenticular lens array, the liquid crystal display device 10 of the present embodiment displays planar characters, images, etc.

[0122] On one hand, when the control unit 500 controls the potentials of the third electrode 642 and the counter electrode 652 to be the same potential and the potential of the fourth electrode 644 to be a potential different from the potentials of the third electrode 642 and the counter electrode 652, a voltage is applied to the liquid crystal 636, so that the alignment state of the liquid crystal 636 changes. In the present embodiment, due to the change in the alignment state of the liquid crystal 636, in a plan view, a refractive index distribution along the X direction corresponding to a lenticular lens is generated in a region between the tooth portions 644a of a pair of fourth electrodes 644 sandwiching the tooth portion 642a of one third electrode 642. In this case, the liquid crystal lens 630 functions as a lenticular lens array, and the liquid crystal display device 10 of the present embodiment displays three-dimensional characters, images, etc.

[0123] The second liquid crystal display panel 200 of the present embodiment is the same as the configuration of the second liquid crystal display panel 200 of Embodiment 4 except for the configuration of the color filter and the pixel electrode 250. Here, the color filter and the pixel electrode 250 of the second liquid crystal display panel 200 will be described.

[0124] Similar to the second liquid crystal display panel 200 of Embodiment 4, the second liquid crystal display panel 200 of the present embodiment includes a color filter and a black matrix BM on the second counter substrate 220 and performs color display. In the present embodiment, the color filter is a color filter whose stripe direction is the X direction, and as shown in FIG. 30, sub-pixels 204 of the same color are arranged in the X direction.

[0125] As shown in FIG. 31, the pixel electrodes 250 of the present embodiment are arranged one by one for each of the sub-pixels 204. Similar to the pixel electrode 250 of Embodiment 3, the pixel electrode 250 of the present embodiment has a connection portion 252, a first tooth portion 254a, and a second tooth portion 254b, and the connection portion 252 overlaps the third light-shielding line 272 or the fourth light-shielding line 274.

[0126] When a voltage is applied to the second liquid crystal 230, similar to Embodiment 3, one dark line extending in the Y direction formed by the dark line due to the third light-shielding line 272 and the dark line DkL2 due to the connection portion 252, and one dark line extending in the Y direction formed by the dark line due to the fourth light-shielding line 274 and the dark line DkL2 due to the connection portion 252, and a dark line DkL3 extending in the Y direction due to the boundary portion 258 are generated. As shown in FIG. 32, the dark line DkL3 overlaps the black matrix BM. Therefore, only one dark line is generated as the dark line extending in the Y direction within the sub-pixel 204. In FIG. 32, for easy understanding, the portion of the pixel electrode 250 overlapping the black matrix BM is also illustrated by a solid line.

[0127] As described above, since the connection portion 252 of the pixel electrode 250 overlaps the third light-shielding line 272 or the fourth light-shielding line 274, when a voltage is applied to the second liquid crystal 230, the dark lines generated within the sub-pixel 204 of the second liquid crystal display panel 200 can be reduced. Thereby, moiré of the liquid crystal display device 10 due to the light-shielding portion 648 or the tooth portion 642a of the liquid crystal lens 630 and the dark lines of the second liquid crystal display panel 200 can be suppressed.

[0128] Also, in the present embodiment as well, moiré of the liquid crystal display device 10 can be suppressed by the first light-shielding pattern 260 and the second light-shielding pattern 270. Furthermore, the aperture ratio of the second main pixel 202 and the transmittance of the liquid crystal display device 10 can be increased.

[0129] <Modification Example> As described above, the embodiments have been described, but the present disclosure can be variously modified without departing from the gist.

[0130] In the embodiment, the first liquid crystal display panel 100 operates in the horizontal electric field mode. The operation mode of the first liquid crystal display panel 100 is arbitrary.

[0131] In the embodiment, the first liquid crystal 130 and the second liquid crystal 230 are positive-type nematic liquid crystals. The first liquid crystal 130 may be a negative-type nematic liquid crystal. Also, the second liquid crystal 230 may be a negative-type nematic liquid crystal.

[0132] In an embodiment, the first liquid crystal display panel 100 has a color filter whose stripe direction is the Y direction. The first liquid crystal display panel 100 may have a color filter whose stripe direction is the X direction.

[0133] In an embodiment, one second main pixel 202 of the second liquid crystal display panel 200 corresponds to 16 first main pixels 102 of the first liquid crystal display panel 100. The number of first main pixels 102 of the first liquid crystal display panel 100 corresponding to one second main pixel 202 of the second liquid crystal display panel 200 is arbitrary.

[0134] Also, the first light-shielding line 262 of the first light-shielding pattern 260 has a first flat portion 262c, and the second light-shielding line 264 of the first light-shielding pattern 260 has a second flat portion 264c. The first light-shielding line 262 may not have the first flat portion 262c, and the second light-shielding line 264 may not have the second flat portion 264c. That is, the first light-shielding line 262 and the second light-shielding line 264 are in a line-symmetric relationship with respect to the X direction, and each may extend in a zigzag manner in the X direction.

[0135] On the other hand, the third light-shielding line 272 of the second light-shielding pattern 270 may connect a fifth inclined portion 272a and a sixth inclined portion 272b and have a third flat portion extending parallel to the Y direction. Also, the fourth light-shielding line 274 of the second light-shielding pattern 270 may connect a seventh inclined portion 274a and an eighth inclined portion 274b and have a fourth flat portion extending parallel to the Y direction.

[0136] In Embodiments 1, 2, and 4, the second light-shielding pattern 270 (the third light-shielding line 272 and the fourth light-shielding line 274) may not bend and may extend parallel to the Y direction. Also, in Embodiments 3 and 5, the first light-shielding pattern 260 (the first light-shielding line 262 and the second light-shielding line 264) may not bend and may extend parallel to the X direction.

[0137] In an embodiment, the second liquid crystal display panel 200 includes the first light-shielding pattern 260 and the second light-shielding pattern 270. The second liquid crystal display panel 200 may include at least one of the first light-shielding pattern 260 and the second light-shielding pattern 270.

[0138] 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. It is only necessary that at least one of the first light-shielding line 262 and the second light-shielding line 264 of the first light-shielding pattern 260 is 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 connecting 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, it is only necessary that at least one of the third light-shielding line 272 and the fourth light-shielding line 274 is formed from the signal wiring DL.

[0139] In the embodiment, the first tooth portion 254a and the second tooth portion 254b of the pixel electrode 250 are inclined at an acute angle with respect to the X direction or the Y direction (predetermined direction). The first tooth portion 254a and the second tooth portion 254b may extend parallel to the X direction or the Y direction. For example, as shown in FIG. 33, the first tooth portion 254a of the pixel electrode 250 may extend parallel to the +Y direction, and the second tooth portion 254b of the pixel electrode 250 may extend parallel to the -Y direction.

[0140] The shape of the second main pixel 202 of the second liquid crystal display panel 200 is arbitrary. For example, the shape of the second main pixel 202 of the second liquid crystal display panel 200 may be non-rectangular as shown in FIG. 34. In this modification, the pixel electrode 250 has a connection portion 252 that overlaps the first light-shielding line 262 or the second light-shielding line 264, and a tooth portion 254 that branches from the connection portion 252 and extends in the +Y direction. The tooth portion 254 extends by bending in the +Y direction, and the end portion 255 of the tooth portion 254 overlaps the adjacent first light-shielding line 262 or second light-shielding line 264. In FIG. 34, the pixel electrode 250 is illustrated by a solid line for easy understanding.

[0141] The liquid crystal display device 10 of Embodiment 5 may include a parallax barrier panel 660 instead of the liquid crystal lens 630. In this case, the liquid crystal display device 10 displays three-dimensional characters, images, etc. by the parallax barrier method. As shown in FIG. 35, the parallax barrier panel 660 has a third light-transmissive substrate 662. On the main surface 662a of the third light-transmissive substrate 662, light-shielding portions 664 extending in the Y direction are formed at equal intervals, and light-transmissive portions 666 are provided between the light-shielding portions 664. Note that the parallax barrier panel 660 corresponds to an element.

[0142] Although the preferred embodiments have been described above, the present disclosure is not limited to such specific embodiments, and the present disclosure includes the invention described in the claims and the equivalent scope thereof.

Description of Reference Numerals

[0143] 10 Liquid crystal display device, 50 Panel unit, 100 First liquid crystal display panel, 102 First 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 counter substrate, 120a, 120b Main surface, 122 Color filter, 130 First liquid crystal, 132 First polarizing plate, 134 Second polarizing plate, 136 First driver circuit, 138 Sealing material, 150 Adhesive layer, 200 Second liquid crystal display panel, 202 Second main pixel, 204 Sub-pixel, 204R Red pixel, 204G Green pixel, 204B Blue pixel, 210 Second TFT substrate, 210a, 210b Main surface, 220 Second counter substrate, 220a, 220b Main surface, 230 Second liquid crystal, 230M Liquid crystal molecule, 232 Third polarizing plate, 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 Connection part, 252a Portion, 254 Tooth part, 254a First tooth part, 254b Second tooth part, 255 End part, 256 Bending part, 258 Boundary part, 260 First light-shielding pattern, 262 First light-shielding line, 262a First inclined part, 262b Second inclined part, 262c First flat part, 264 Second light-shielding line, 264a Third inclined part, 264b Fourth inclined part, 264c Second flat part, 270 Second light-shielding pattern, 272 Third light-shielding line, 272a Fifth inclined part, 272b Sixth inclined part, 274 Fourth light-shielding line, 274a Seventh inclined part, 274b Eighth inclined part, 282 First insulating layer, 284 Second insulating layer, 286 Third insulating layer, 300 Backlight, 400 Display control unit, 410 Data distribution unit, 420 First signal generation unit, 422 First tone conversion unit, 430 Second luminance signal generation unit, 440 Second signal generation unit, 442 Arithmetic unit, 444 Second tone conversion unit, 500 Control unit, 610 Touch panel, 611a Main surface, 612 First electrode, 613 Insulating layer, 614 Second electrode, 620 Cover, 630 Liquid crystal lens, 632 First light-transmissive substrate, 632a,632b main surface, 634 second light-transmissive substrate, 634a main surface, 636 liquid crystal, 642 third electrode, 642a tooth portion, 644 fourth electrode, 644a tooth portion, 646 alignment film, 648 light-shielding portion, 652 counter electrode, 654 alignment film, 660 parallax barrier panel, 662 third light-transmissive substrate, 664 light-shielding portion, 666 light-transmissive portion, BM black matrix, CE common electrode, CH contact hole, DL signal wiring, GL scanning wiring, D1, D2 distances, DkL1, DkL2, DkL3 dark lines, E electric field, Lu luminance, L1 to L5, LL1, LL2 intervals, θ1, θ2 tilt angles, φ angle

Claims

1. A first liquid crystal display panel having a first main pixel, a second liquid crystal display panel having second main pixels corresponding to the plurality of first main pixels and a light-shielding pattern that is repeatedly arranged and has light-shielding properties, the second liquid crystal display panel overlapping the first liquid crystal display panel, wherein the light-shielding pattern includes a first light-shielding line that extends in a predetermined direction and has 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 that is adjacent to the first light-shielding line and is line-symmetric to the first light-shielding line with respect to the predetermined direction, wherein the pixel electrode of the second main pixel has a plurality of tooth portions and a connecting portion connecting the plurality of tooth portions, wherein at least one of the first light-shielding line and the second light-shielding line is formed from either a scanning wiring or a signal wiring of the second liquid crystal display panel, wherein, in a plan view, the connecting portion overlaps the first light-shielding line or the second light-shielding line, A liquid crystal display device.

2. The plurality of tooth portions are formed from a plurality of first tooth portions and a plurality of second tooth portions that branch from the connecting portion, extend in opposite directions across the connecting portion, and are inclined at an acute angle in opposite directions with respect to the predetermined direction, wherein the interval between the first tooth portions is equal to the interval between the second tooth portions, wherein the inclination angle of the first tooth portions with respect to the predetermined direction is equal to the inclination angle of the second tooth portions with respect to the predetermined direction, The liquid crystal display device according to Claim 1.

3. wherein an end portion of the tooth portion overlaps the first light-shielding line or the second light-shielding line that overlaps the connecting portion and also overlaps the adjacent first light-shielding line or second light-shielding line, The liquid crystal display device according to Claim 1.

4. An element having an electrode or a light-shielding portion, a liquid crystal display panel having a main pixel and a light-shielding pattern that is repeatedly arranged and has light-shielding properties, the liquid crystal display panel overlapping the element, wherein the light-shielding pattern includes a first light-shielding line that extends in a predetermined direction and has 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 that is adjacent to the first light-shielding line and is line-symmetric to the first light-shielding line with respect to the predetermined direction, wherein the pixel electrode of the main pixel has a plurality of tooth portions and a connecting portion connecting the plurality of tooth portions, wherein at least one of the first light-shielding line and the second light-shielding line is formed from either a scanning wiring or a signal wiring of the liquid crystal display panel, wherein, in a plan view, the connecting portion overlaps the first light-shielding line or the second light-shielding line, A liquid crystal display device.

Images