LCD devices

Abstract

A liquid crystal display device includes a first liquid crystal display panel and a second liquid crystal display panel overlapping the first liquid crystal display panel. At least one of the first liquid crystal display panel and the second liquid crystal display panel includes a light-blocking pattern that is repeatedly arranged and has light-blocking properties. The light-blocking pattern includes a first light-blocking line and a second light-blocking line extending in a predetermined direction. The first light-blocking line includes a first inclined portion inclined relative to the predetermined direction and a second inclined portion inclined in a direction opposite to the first inclined portion relative to the predetermined direction, and the second light-blocking line is adjacent to the first light-blocking line and is line-symmetrical to the first light-blocking line relative to the predetermined direction. At least one of the first light-blocking line and the second light-blocking line is formed by one of the scan wiring and the signal wiring of the first liquid crystal display panel and the second liquid crystal display panel.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of Japanese Patent Application No. 2022-019875, filed on February 10, 2022, the entire disclosure of which is incorporated herein by reference. Technical Field

[0003] The present disclosure generally relates to liquid crystal display devices. Background Art

[0004] In the related art, it is known that multiple liquid crystal panels are stacked in a liquid crystal display device to improve contrast. For example, Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. 2021-535415 describes a display panel that includes stacked display liquid crystal panels and a light control panel.

[0005] In the unexamined Japanese patent application publication (translation of the PCT application) No. 2021-535415, a display liquid crystal panel implements a display function, and a light control panel controls light entering the display liquid crystal panel from a backlight. The light control panel includes a plurality of signal lines (gate lines and data lines). At least a portion of the signal lines of the light control panel are broken lines.

[0006] In Unexamined Japanese Patent Application Publication (a translation of a PCT application) No. 2021-535415, the signal lines of the light control panel are configured as zigzag lines, so that the grid lines (gate lines and data lines) of the display liquid crystal panel are formed in different patterns. As a result, moiré patterns on the display panel are reduced. However, because the zigzag lines of the light control panel have the same shape and are arranged at equal intervals, moiré patterns on the display panel cannot be fully suppressed.

[0007] The present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide a liquid crystal display device that suppresses moiré. Summary of the Invention

[0008] In order to achieve the above-mentioned object, a liquid crystal display device according to a first aspect of the present disclosure includes:

[0009] a first liquid crystal display panel; and

[0010] a second liquid crystal display panel positioned on a side of the first liquid crystal display panel opposite to the viewer-side surface thereof so as to overlap the first liquid crystal display panel, wherein

[0011] At least one of the first liquid crystal display panel and the second liquid crystal display panel includes a light blocking pattern that is repeatedly arranged and has a light blocking characteristic,

[0012] The photoresist pattern includes: a first photoresist line extending in a predetermined direction, the first photoresist line including a first inclined portion inclined relative to the predetermined direction and a second inclined portion inclined in a direction opposite to the first inclined portion relative to the predetermined direction; and a second photoresist line adjacent to the first photoresist line and line-symmetrical to the first photoresist line relative to the predetermined direction, and

[0013] At least one of the first and second photoblock lines is formed from one of a scan wiring and a signal wiring of the first and second liquid crystal display panels.

[0014] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the disclosure.

[0015] According to the present disclosure, a light-resist pattern includes: a first light-resist line extending in a predetermined direction, the first light-resist line including a first inclined portion tilted relative to the predetermined direction and a second inclined portion tilted in a direction opposite to the predetermined direction; and a second light-resist line adjacent to the first light-resist line and line-symmetric to the first light-resist line relative to the predetermined direction. Consequently, moiré patterns in liquid crystal display devices can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] A more complete understanding of the present application can be obtained when the following detailed description is considered in conjunction with the following drawings, in which:

[0017] Figure 1 is a schematic diagram showing a liquid crystal display device according to Example 1;

[0018] Figure 2 is a plan view showing a first liquid crystal display panel according to Example 1;

[0019] Figure 3 is a cross-sectional view showing a liquid crystal display device according to Example 1;

[0020] Figure 4 is a plan view showing a second liquid crystal display panel according to Example 1;

[0021] Figure 5 is a schematic diagram showing a first photoresist pattern and a second photoresist pattern according to Example 1;

[0022] Figure 6 is a schematic diagram showing a first photoresist pattern, a second photoresist pattern, and a primary pixel of a first liquid crystal display panel corresponding to a primary pixel of a second liquid crystal display panel according to Example 1;

[0023] Figure 7is a schematic diagram illustrating a relationship between a first light blocking pattern and a second light blocking pattern and a main pixel of a first liquid crystal display panel when the first and second liquid crystal display panels are shifted in stacking according to Embodiment 1;

[0024] Figure 8 is a plan view showing scan wiring, signal wiring, switching elements, etc. of the second liquid crystal display panel according to Example 1;

[0025] Figure 9 yes Figure 8 A cross-sectional view of one of the switching elements and the contact hole shown along line AA;

[0026] Figure 10 is a block diagram showing a display controller according to Embodiment 1;

[0027] Figure 11 is a schematic diagram illustrating a first light blocking pattern, a second light blocking pattern, and a primary pixel in a first liquid crystal display panel corresponding to one primary pixel of a second liquid crystal display panel according to a modified example;

[0028] Figure 12 is a schematic diagram illustrating an intersection of a first inclined portion and a second inclined portion in a first light resist line according to a modified example; and

[0029] Figure 13 2 is a schematic diagram illustrating a first photoresist pattern and a second photoresist pattern according to a modified example. DETAILED DESCRIPTION

[0030] Hereinafter, a liquid crystal display device according to various embodiments is described while referring to the accompanying drawings.

[0031] In reference Figures 1 to 10 , a liquid crystal display device 10 according to the present embodiment is described. The liquid crystal display device 10 displays a color image using a first liquid crystal display panel 100 and a second liquid crystal display panel 200 described later.

[0032] like Figure 1 As shown, the liquid crystal display device 10 includes a panel unit 50, a backlight 300, and a display controller 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 emits light on the first liquid crystal display panel 100 and the second liquid crystal display panel 200. The display controller 400 controls the display of the first liquid crystal display panel 100 and the second liquid crystal display panel 200. Note that in this description, for ease of understanding, Figure 1In the liquid crystal display device 10, the right direction (right direction on the paper) is called the "+X direction", the upper direction (upper direction on the paper) is called the "+Y direction", and the direction perpendicular to the +X direction and the +Y direction (forward direction on the paper) is called the "+Z direction".

[0033] Panel

[0034] The panel unit 50 includes a first liquid crystal display panel 100 and a second liquid crystal display panel 200. The first liquid crystal display panel 100 is positioned on the viewer side (+Z side) and displays a color image. The second liquid crystal display panel 200 is positioned on the side of the first liquid crystal display panel 100 opposite to the viewer side (the back side of the first liquid crystal display panel 100) and overlaps with the first liquid crystal display panel 100. The second liquid crystal display panel 200 displays a monochrome image.

[0035] First liquid crystal display panel

[0036] In one example, the first liquid crystal display panel 100 is implemented as a known transmissive horizontal electric field type liquid crystal display panel. The first liquid crystal display panel 100 is an active matrix driven by thin film transistors (TFTs).

[0037] like Figure 2 As shown, the first liquid crystal display panel 100 includes main pixels 102 arranged in a matrix. The main pixels 102 include 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 by a black matrix BM in a V shape. Note that the red pixel 104R, the green pixel 104G, and the blue pixel 104B can be collectively referred to as "sub-pixels 104."

[0038] The sub-pixel 104 is divided into two domains 104a, 104b having different rotation directions of the first liquid crystal 130. The domain 104a and the domain 104b are defined by a black matrix BM.

[0039] like Figure 3 As shown, 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.

[0040] In one example, the first TFT substrate 110 is implemented as a glass substrate. A TFT for selecting 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 110 a of the first TFT substrate 110 on the first liquid crystal 130 side (all not shown).

[0041] In addition, a plurality of common wirings, a plurality of signal wirings, and a plurality of scan wirings (not shown in the figure) are formed on the main surface 110a of the first TFT substrate 110. The common wiring provides a common potential to the common electrode, and the common electrode applies a voltage to the first liquid crystal 130. The signal wiring provides a voltage to the pixel electrode via the TFT, and the pixel electrode applies a voltage to the first liquid crystal 130. The signal wiring extends in the Y direction and bends along the V shape of the sub-pixel 104. The scan wiring provides a voltage for operating the TFT. The scan wiring extends linearly in the Y direction. The sub-pixel 104 is surrounded by the signal wiring and the scan wiring, and the TFT is arranged at the intersection of the scan wiring and the signal wiring. The first polarizing plate 132 is arranged on the main surface 110b of the first TFT substrate 110 on the side opposite to the main surface 110a.

[0042] like Figure 3 As shown, the first counter substrate 120 is opposite to the first TFT substrate 110 and adhered to the first TFT substrate 110 by a sealing material 138. In one example, the first counter substrate 120 is implemented as a glass substrate. A color filter 122, a black matrix BM, an alignment film for aligning the first liquid crystal 130, etc. are provided on the main surface 120a of the first counter substrate 120 on the first liquid crystal 130 side. In one example, the color filter 122 is implemented as a striped color filter, in which color filters of the same color are arranged in the Y direction (wherein the striped direction is the color filter in the Y direction). The red color filter, the green color filter, and the blue color filter of the color filter 122 are each 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 Figure 2 As shown, the black matrix BM defines the main pixel 102, the sub-pixel 104 and the domains 104a and 104b. The second polarizing plate 134 is provided on the main surface 120b of the first counter substrate 120 opposite to the main surface 120a. Figure 3 The black matrix BM, alignment film, etc. are omitted.

[0043] like Figure 3As shown, first liquid crystal 130 is sandwiched between first TFT substrate 110 and first counter substrate 120. In one example, first liquid crystal 130 is implemented as a positive nematic liquid crystal. The first liquid crystal 130 is aligned parallel to the main surface 110a of the first TFT substrate 110 by an alignment film. Furthermore, due to the application of a voltage, the first liquid crystal 130 rotates within a plane parallel to the main surface 110a of the first TFT substrate 110.

[0044] A first polarizing plate 132 is disposed on the main surface 110b of the first TFT substrate 110. A second polarizing plate 134 is disposed on the main surface 120b of the first counter substrate 120. One of the transmission axes of the first polarizing plate 132 and the second polarizing plate 134 is arranged parallel to the arrangement direction of the first liquid crystals 130. 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 adhered to the second counter substrate 220 of the second liquid crystal display panel 200 described below via a light-transmitting adhesive layer 150. In one example, the adhesive layer 150 is implemented as an optically clear adhesive (OCA).

[0045] The first driver circuit 136 is provided on the main surface 110a of the first TFT substrate 110. The first driver circuit 134 supplies voltages to the scan wirings, the signal wirings, and the common wirings based on the color image signals supplied from the display controller 400.

[0046] Second liquid crystal display panel

[0047] like Figure 3 As shown, the second liquid crystal display panel 200 is positioned on the back side (-Z side) of the first liquid crystal display panel 100 and adhered to the first liquid crystal display panel 100 through an adhesive layer 150. The second liquid crystal display panel 200 displays a monochrome image.

[0048] In this embodiment, the second liquid crystal display panel 200 is implemented as a transmissive horizontal electric field type liquid crystal display panel using positive liquid crystal. The second liquid crystal display panel 200 is an active matrix driven by a switching element 240 described below. Figure 4 As shown, the second liquid crystal display panel 200 includes primary pixels 202 arranged in a matrix. In this embodiment, one primary pixel 202 of the second liquid crystal display panel 200 corresponds to 16 (4×4) primary pixels 102 of the first liquid crystal display panel 100, and one primary pixel 202 of the second liquid crystal display panel 200 emits light on the 16 primary pixels 102 of the first liquid crystal display panel 100. Note that Figure 4 In the following drawings, the scan wiring GL and the signal wiring DL may be shown as a dotted line or a solid line.

[0049] like Figure 3 As shown, 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. Note that in this embodiment, the first polarizing plate 132 of the first liquid crystal display panel 100 also serves as a polarizing plate on the light-emitting side of the second liquid crystal display panel 200. Note that the second liquid crystal display panel 200 is not provided with a color filter or a black matrix.

[0050] In one example, the second TFT substrate 210 is implemented as a glass substrate. A plurality of scanning wirings GL; a plurality of signal wirings DL; a common wiring (not shown) of the main pixel 202, a switching element 240, a pixel electrode 250, and a common electrode CE; an alignment film (not shown) for aligning the second liquid crystal 230, etc. (all described later) are formed on the main surface 210a of the second TFT substrate 210 on the second liquid crystal 230 side. The common wiring provides a common potential to the common electrode CE, and the common electrode CE applies a voltage to the second liquid crystal 230. The signal wiring DL provides a voltage to the pixel electrode 250 via the switching element 240. The pixel electrode 250 applies a voltage to the second liquid crystal 230. The scanning wiring GL provides 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 on the side opposite to the main surface 210a.

[0051] In this embodiment, the scan wiring GL forms a first photoresist pattern 260 described below, and the signal wiring DL forms a second photoresist pattern 270. The configuration of the scan wiring GL, the signal wiring DL, the main pixel 202 (the switching element 240, the common electrode CE, and the pixel electrode 250), etc. will be described later.

[0052] The second counter substrate 220 is opposite the second TFT substrate 210 and is adhered to the second TFT substrate 210 via a sealing material 238. In one example, the second counter substrate 220 is implemented as a glass substrate. An alignment film (not shown) for aligning the second liquid crystals 230 is provided on the main surface 220a of the second counter substrate 220 on the side facing the second liquid crystals 230. An adhesive layer 150 is provided on the main surface 220b of the second counter substrate 220 on the side opposite the main surface 220a. The second counter substrate 220 is adhered to the first liquid crystal display panel 100 (first polarizing plate 132) via the adhesive layer 150.

[0053] 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 implemented as a normal nematic liquid crystal. The second liquid crystal 230 is initially aligned in the Y direction by the alignment film. Due to the application of voltage, the second liquid crystal 230 rotates within a plane parallel to the main surface 210a of the second TFT substrate 210.

[0054] 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 arrangement direction of the second liquid crystal 230. Note that the transmission axis of the third polarizing plate 232 and the transmission axis of the polarizing plate 132 of the first liquid crystal display panel 100 (the polarizing plate on the light-emitting side of the second liquid crystal display panel 200) are orthogonal to each other, and the second liquid crystal display panel 200 operates in the normally black mode.

[0055] 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 scan wiring GL, the signal wiring DL, and the common wiring based on signals supplied from the display controller 400.

[0056] Next, refer to Figures 4 to 7 The scan wiring GL, the signal wiring DL, the first photoresist pattern 260 and the second photoresist pattern 270 are described.

[0057] First, the scanning wiring GL and the first photoresist pattern 260 are described. The scanning wiring GL has a photoresist property. The scanning wiring GL is formed of a metal (aluminum (Al), molybdenum (Mo), etc.). Figure 4 and Figure 5 As shown, the scan wiring GL extends in the X direction and is arranged in the Y direction. Furthermore, a pair of adjacent scan wirings GL form a first photoresist pattern 260 extending in the X direction and having light-blocking properties. The first photoresist patterns 260 are repeatedly arranged in the Y direction. Here, the term "light-blocking properties" refers to blocking at least a portion of the light emitted from the backlight 300. In this embodiment, the X direction corresponds to the predetermined direction of the first photoresist pattern 260 (scan wiring GL).

[0058] like Figure 5 As shown, one of the adjacent pair of scan wirings GL (hereinafter also referred to as the "first light blocking line 262") includes 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 in the counterclockwise direction relative to the +X direction. The second inclined portion 262b is inclined at an acute angle in the direction opposite to the first inclined portion 262a (clockwise direction) relative 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.

[0059] The other scanning wiring GL of the pair of adjacent scanning wirings GL (hereinafter also referred to as the "second photoblock line 264") has line symmetry with one scanning wiring GL (the first photoblock line 262) with respect to the X direction, and includes a third inclined portion 264a, a fourth inclined portion 264b, and a second flat portion 264c. The third inclined portion 264a is opposite the first inclined portion 262a of the first photoblock line 262 and is inclined at an acute angle in the clockwise direction relative to the +X direction. The fourth inclined portion 264b is opposite the second inclined portion 262b of the first photoblock line 262 and is inclined at an acute angle in the opposite direction (counterclockwise) relative to the +X direction as the third inclined portion 264a. The second flat portion 264c extends parallel to the X direction, opposite the first flat portion 262c, and connects the third inclined portion 264a and the fourth inclined portion 264b.

[0060] In this embodiment, the first light blocking line 262 includes a first inclined portion 262a inclined at an acute angle in the counterclockwise direction relative to the +X direction, and a second inclined portion 262b inclined at an acute angle in the direction opposite to the first inclined portion 262a relative to the +X direction, and the first light blocking line 262 and the second light blocking line 264 adjacent to the first light blocking line 264 have a line symmetric relationship with respect to the X direction. Therefore, as Figure 5 As shown, the spacing (spacing L1) between the first light resist line 262 and the second light resist line 264 continuously changes between the first inclined portion 262a of the first light resist line 262 and the third inclined portion 264a of the second light resist line 264. In addition, the spacing (spacing L2) between the first light resist line 262 and the second light resist line 264 also continuously changes between the second inclined portion 262b of the first light resist line 262 and the fourth inclined portion 264b of the second light resist line 264. In addition, the spacing (spacing L3 and spacing L4) between the first flat portion 262c of the first light resist line 262 and the second flat portion 264c of the second light resist line 264 also changes (spacing L3 and spacing L4 are arranged alternately along the Y direction). As a result, even if the second liquid crystal display panel 200 and the first liquid crystal display panel 100 overlap, spatial frequency interference in the second liquid crystal display panel 200 and the first liquid crystal display panel 100 is suppressed, and thus moiré patterns of the liquid crystal display device 10 can be suppressed.

[0061] Next, the signal wiring DL and the second photoresist pattern 270 are described. Like the scanning wiring GL, the signal wiring DL has a photoresist property. The signal wiring DL is formed of a metal (aluminum (Al), molybdenum (Mo), etc.). Figure 4 and Figure 5As shown, the signal wiring DL extends in the Y direction and is arranged in the X direction. In addition, a pair of adjacent signal wirings DL form a second photoresist pattern 270 extending in the Y direction and having a light-blocking property. In this embodiment, the Y direction corresponds to the predetermined direction of the second photoresist pattern 270 (signal wiring DL).

[0062] like Figure 5 As shown, one of the pair of adjacent signal wirings DL (hereinafter also referred to as the "third light-blocking line 272") includes a fifth inclined portion 272a and a sixth inclined portion 272b. The fifth inclined portion 272a is inclined at an acute angle in the counterclockwise direction relative 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) relative to the +Y direction.

[0063] The other signal wiring DL of a pair of adjacent signal wirings DL (hereinafter also referred to as the "fourth photoresist line 274") has line symmetry with one signal wiring DL (the third photoresist line 272) relative to the Y direction, and includes a seventh inclined portion 274a and an eighth inclined portion 274b. The seventh inclined portion 274a is opposite to the fifth inclined portion 272a of the third photoresist line 272 and is inclined at an acute angle in the clockwise direction relative to the +Y direction. The eighth inclined portion 274b is opposite to the sixth inclined portion 272b of the third photoresist line 272 and is inclined at an acute angle in the direction opposite to the seventh inclined portion 274a relative to the +Y direction (counterclockwise). Note that the third photoresist line 272 and the fourth photoresist line 274 of the second photoresist pattern 270 correspond to the first photoresist line and the second photoresist line of the photoresist pattern, respectively, and the fifth inclined portion 272a and the sixth inclined portion 272b of the third photoresist line 272 correspond to the first inclined portion and the second inclined portion of the first photoresist line, respectively.

[0064] In this embodiment, the third light-blocking line 272 includes a fifth inclined portion 272a inclined at an acute angle in the counterclockwise direction relative 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 relative to the +Y direction, and the third light-blocking line 272 and the fourth light-blocking line 274 adjacent to the third light-blocking line 272 have a line-symmetric relationship with respect to the Y direction. Therefore, as Figure 5 As shown, the interval L5 between the third light-resistance line 272 and the fourth light-resistance line 274 varies continuously. As a result, even if the second liquid crystal display panel 200 and the first liquid crystal display panel 100 overlap, spatial frequency interference in the second liquid crystal display panel 200 and the first liquid crystal display panel 100 is suppressed, and thus moiré patterns of the liquid crystal display device 10 can be suppressed.

[0065] Next, refer to Figure 6The overlap of the first photoresist pattern 260 and the second photoresist pattern 270 with the main pixel 102 of the first liquid crystal display panel 100 is described. Figure 6 The diagram shows a first photoresist pattern 260 (scanning wiring GL), a second photoresist pattern 270 (signal wiring DL), and a primary pixel 102 of the first liquid crystal display panel 100 corresponding to one primary pixel 202 of the second liquid crystal display panel 200. In this embodiment, as will be described later, one primary 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.

[0066] like Figure 6 As shown, in the first photoresist pattern 260 extending along the X-direction, the first and second inclined portions 262a, 262b of the first photoresist line 262, and the third and fourth inclined portions 264a, 264b of the second photoresist line 264 are inclined across the multiple sub-pixels 104 (104R, 104G, 104B) of different colors in the first liquid crystal display panel 100. Consequently, the brightness of the sub-pixels 104 with which the first photoresist pattern 260 overlaps is slightly reduced, and the main pixel 102 including the sub-pixels 104 with which the first photoresist pattern 260 overlaps appears to have a color slightly different from the intended color. However, because the sub-pixels 104 experiencing similar brightness reductions are positioned very close together, the brightness of the sub-pixels 104 is averaged relative to an observer viewing the liquid crystal display device 10, and the observer perceives the brightness of the multiple sub-pixels 104 with reduced brightness as being at the same brightness level. Consequently, the observer's perception of color moiré patterns can be suppressed with respect to the entire display of the liquid crystal display device 10. Note that the first flat portion 262 c of the first light-blocking line 262 and the second flat portion 264 c of the second light-blocking line 264 overlap with the black matrix BM of the first liquid crystal display panel 100 .

[0067] In the second photoresist pattern 270 extending along the Y direction, the fifth and sixth inclined portions 272a and 272b of the third photoresist line 272, as well as the seventh and eighth inclined portions 274a and 274b of the fourth photoresist line 274, are inclined across the multiple sub-pixels 104 (104R, 104B) of different colors in the first liquid crystal display panel 100. As a result, as with the first photoresist pattern 260, the primary pixel 102 including the sub-pixel 104 overlapping with the second photoresist pattern 270 presents a color slightly different from the intended color. However, the color presented by the primary pixel 102 including the sub-pixel 104 overlapping with the second photoresist pattern 270 and the color presented by the primary pixel 102 located near the primary pixel 102 including the sub-pixel 104 overlapping with the second photoresist pattern 270 are perceived by the observer as different colors, and the saturation of the combined color is reduced. As a result, the observer's perception of color moiré can be suppressed with respect to the entire display of the liquid crystal display device 10.

[0068] In addition, even in Figure 7 In the case where the second LCD panel 200 and the first LCD panel 100 are offset from each other, the areas of the first and second photoresist patterns 260 and 270 that overlap with the sub-pixels 104 of the first LCD panel 100 do not change significantly compared to when the second LCD panel 200 and the first LCD panel 100 are precisely stacked. Furthermore, even when the second LCD panel 200 and the first LCD panel 100 are offset from each other, the first to eighth inclined portions 262a to 274b intersect with sub-pixels 104 of different colors. As a result, the colors represented by the primary pixels 102 are averaged across adjacent primary pixels 102, and thus, even when the second LCD panel 200 and the first LCD panel 100 are offset from each other, the observer's perception of color moiré can be suppressed.

[0069] Next, refer to Figure 8 and Figure 9 At the same time, the scan wiring GL (first photoblock line 262 and second photoblock line 264); the signal wiring DL (third photoblock line 272 and fourth photoblock line 274); and the switching element 240, pixel electrode 250 and common electrode CE of the main pixel 202 are described. Figure 8 It is a plan view showing the scanning lines GL, the signal lines DL, the switching elements 240 , and the like. Figure 9 It is intercepted along line AA Figure 8 FIG. 2 is a cross-sectional view of one of the switching elements 240 and the contact hole CH shown in FIG. Figure 8 The common electrode CE is omitted.

[0070] In this embodiment, one main pixel 202 includes four switching elements 240 and four pixel electrodes 250. One main pixel 202 is driven by voltages (signals) from a pair of adjacent scanning wirings GL (a first photoresist line 262 and a second photoresist line 264) and a pair of adjacent signal wirings DL (a third photoresist line 272 and a fourth photoresist line 274).

[0071] like Figure 9 As shown, the scanning wiring GL (the first photoresist line 262 and the second photoresist line 264) is formed on the main surface 210a of the second TFT substrate 210 and is covered by the first insulating layer 282. The signal wiring DL (the third photoresist line 272 and the fourth photoresist line 274) is formed on the first insulating layer 282 and is covered by the second insulating layer 284.

[0072] like Figure 9 As shown, the common electrode CE is formed on the second insulating layer 284. In one example, the common electrode CE is formed of indium tin oxide (ITO). The common electrode CE is covered by the third insulating layer 286.

[0073] The four switching elements 240 are respectively provided at the intersections of the scanning wiring GL and the signal wiring DL. Figure 8 and Figure 9 As shown, each switching element 240 includes a gate electrode 242, a semiconductor layer 244, a source electrode 246, and a drain electrode 248. In one example, the switching element 240 is implemented as a TFT element.

[0074] The gate electrode 242 is formed integrally with the scan wiring GL on the main surface 210a of the second TFT substrate 210. Like the scan wiring GL, the gate electrode 242 is covered by the first insulating layer 282. The semiconductor layer 244 is provided on the gate electrode 242 in an island-like manner via the first insulating layer 282. In one example, the semiconductor layer 244 is formed of amorphous silicon. The source electrode 246 is formed integrally with the signal wiring DL. The drain electrode 248 extends from the semiconductor layer 244 along the scan wiring GL, and then bends and is connected to the pixel electrode 250. Figure 9 As shown, the drain electrode 248 is connected to the pixel electrode 250 via a contact hole CH penetrating 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), molybdenum (Mo). Figure 9 As shown, the semiconductor layer 244 , the source electrode 246 , and the drain electrode 248 are covered by a second insulating layer 284 .

[0075] like Figure 9As shown, the first insulating layer 282 covers the scan 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, 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.

[0076] like Figure 8 As shown, four pixel electrodes 250 are connected to four switching elements 240 (drain electrodes 248), respectively. The pixel electrode 250 has a comb-tooth shape, and the teeth 252 are inclined relative to the Y direction. Figure 9 As shown, the pixel electrode 250 is formed on the third insulating layer 286. In one example, the pixel electrode 250 is formed of ITO. Note that the angle at which the teeth 252 of the pixel electrode 250 are tilted relative to the Y direction is unrelated to the angle at which the signal wiring DL (the third photoresist line 272 and the fourth photoresist line 274) are tilted relative to the Y direction.

[0077] Backlight

[0078] like Figure 1 As shown, the backlight 300 is arranged on the back side surface (-Z side) of the second liquid crystal display panel 200. In one example, the backlight 300 is implemented as a direct backlight. The backlight 300 includes a white light emitting diode (LED), a reflective sheet, a diffusion sheet, etc. (all not shown in the figure).

[0079] Display Controller

[0080] The display controller 400 controls the display of the first liquid crystal display panel 100 and the second liquid crystal display panel 200. Figure 10 As shown, the display controller 400 includes an image data distributor 410 , a first image signal generator 420 , a second image brightness signal generator 430 , and a second image signal generator 440 .

[0081] The image data distributor 410 distributes input image data to the first image signal generator 420 and the second image brightness signal generator 430 .

[0082] The first image signal generator 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 distributor 410. Specifically, the first grayscale converter 422 of the first image signal generator 420 performs grayscale conversion to convert the distributed input image data into color image data having brightness-grayscale characteristics suitable for the first liquid crystal display panel 100. In one example, a lookup table in which input / output relationships are preset is used for data conversion. The first image signal generator 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.

[0083] The second image brightness signal generator 430 generates a brightness signal based on the input image data distributed from the image data distributor 410 for generating a monochrome image to be displayed on the second liquid crystal display panel 200. In one example, the second image brightness signal generator 430 calculates the brightness level of a primary pixel 202 of the second liquid crystal display panel 200 based on the average, frequency, minimum, and maximum values ​​of the red, green, and blue grayscale values ​​of the 16 primary pixels 102 of the first liquid crystal display panel 100 that are entered by light emitted from the primary pixel 202 of the second liquid crystal display panel 200. The calculated brightness level can be a grayscale value. The second image brightness signal generator 430 transmits a brightness signal representing the calculated brightness level to the second image signal generator 440.

[0084] The second image signal generator 440 generates a monochrome image to be displayed on the second liquid crystal display panel 200 based on the brightness signal sent from the second image brightness signal generator 430. In one example, the second image signal generator 440 generates a monochrome image that has been averaged and grayscale converted. Specifically, in one example, the calculator 442 of the second image signal generator 440 uses a weighted average value based on the distance from the target main pixel 202 to average the brightness levels of the main pixels 202 located within a predetermined distance from the target main pixel 202. Therefore, the second image signal generator 440 can generate a monochrome image with blurred edges. In addition, the second grayscale converter 444 of the second image signal generator 440 generates monochrome image data having brightness-grayscale characteristics suitable for the second liquid crystal display panel 200. The configuration of the second grayscale converter 444 is the same as that of the first grayscale converter 422 of the first image signal generator 420.

[0085] The monochrome image signal transmitted to the second liquid crystal display panel 200 is delayed relative to the color image signal transmitted to the first liquid crystal display panel 100 due to the calculation of the brightness level, averaging processing, etc. performed by the second image brightness signal generator 430. Therefore, the display controller 400 includes a synchronization circuit (not shown) for synchronizing the output of the monochrome image signal and the color image signal. Due to this synchronization circuit, a monochrome image corresponding to the color image of the first liquid crystal display panel 100 is displayed on the second liquid crystal display panel 200, and thus, an appropriate color image is displayed on the liquid crystal display device 10.

[0086] The display controller 400 is configured by a central processing unit (CPU), a memory, etc. In one example, the CPU executes a program stored in the memory to implement the functions of the display controller 400 .

[0087] As described above, the first photoresist pattern (scanning wiring GL) of the second liquid crystal display panel 200 is formed by the first photoresist line 262, which includes a first inclined portion 262a inclined with respect to the +X direction, a second inclined portion 262b inclined in a direction opposite to the first inclined portion 262a with respect to the +X direction, and a first flat portion 262c connecting the first inclined portion 262a and the second inclined portion 262b to each other, and a second photoresist line 264 that is line-symmetrical with respect to the first photoresist line 262 with respect to the X direction. As a result, spatial frequency interference between the first liquid crystal display panel 100 and the second liquid crystal display panel 200 is suppressed, and thus moiré patterns of the liquid crystal display device 10 can be suppressed. In addition, the occurrence of color moiré patterns can be suppressed.

[0088] Furthermore, the second photoresist pattern (signal wiring DL) of the second liquid crystal display panel 200 is formed by a third photoresist line 272 including a fifth inclined portion 272a inclined relative to the +Y direction and a sixth inclined portion 272b inclined in a direction opposite to the fifth inclined portion 272a relative to the +Y direction, and a fourth photoresist line 274 that is line-symmetrical with respect to the Y direction with respect to the third photoresist line 272. As a result, spatial frequency interference between the first liquid crystal display panel 100 and the second liquid crystal display panel 200 is suppressed, and thus, moiré patterns of the liquid crystal display device 10 can be suppressed. Furthermore, the occurrence of color moiré patterns can be suppressed.

[0089] Modified example

[0090] The embodiments have been described, but various modifications can be made to the present disclosure without departing from the spirit and scope of the present disclosure.

[0091] In the embodiment, the first and second liquid crystal display panels 100 and 200 are operated by the horizontal electric field type method. However, the operation methods of the first and second liquid crystal display panels 100 and 200 may be determined as needed.

[0092] In the embodiment, the first polarizing plate 132 of the first liquid crystal display panel 100 also serves as a polarizing plate on the light emitting side of the second liquid crystal display panel 200. However, a configuration is possible in which the second liquid crystal display panel 200 includes a polarizing plate on the main surface 220b of the second counter substrate 220.

[0093] In the embodiment, the switching elements 240 of the second liquid crystal display panel 200 are formed along the scan wiring GL (the first light blocking line 262 and the second light blocking line 264) and are tilted relative to the X direction. However, a configuration is possible in which the switching elements 240 are formed along the X direction. This configuration makes it possible to suppress moiré patterns to a greater extent.

[0094] In the embodiment, one primary pixel 202 of the second liquid crystal display panel 200 corresponds to 16 primary pixels 102 of the first liquid crystal display panel 100. However, the number of primary pixels 102 of the first liquid crystal display panel 100 corresponding to one primary pixel 202 of the second liquid crystal display panel 200 can be set as needed.

[0095] For example, a configuration is possible in which one primary pixel 202 of the second liquid crystal display panel 200 corresponds to one primary pixel 102 of the first liquid crystal display panel 100. In this case, the display controller 400 calculates the brightness level of the corresponding one primary pixel 202 of the second liquid crystal display panel 200 based on the color image data of the one primary pixel 102 of the first liquid crystal display panel 100. In addition, as another method, the display controller 400 may calculate the brightness level of a monochrome image having the maximum grayscale value among the red grayscale value, the green grayscale value, and the blue grayscale value of each primary pixel of the input image data as the brightness level of each primary pixel 202 of the second liquid crystal display panel 200.

[0096] In an embodiment, the second liquid crystal display panel 200 includes the first light blocking pattern 260 and the second light blocking pattern 270. However, it is sufficient that the second liquid crystal display panel 200 includes at least one of the first light blocking pattern 260 or the second light blocking pattern 270.

[0097] Furthermore, the first photoresist line 262 of the first photoresist pattern 260 includes a first flat portion 262c, and the second photoresist line 264 of the first photoresist pattern 260 includes a second flat portion 264c. However, a configuration is possible in which the first photoresist line 262 does not include the first flat portion 262c, and the second photoresist line 264 does not include the second flat portion 264c. In other words, a configuration is possible in which the first photoresist line 262 and the second photoresist line 264 have a line-symmetric relationship with respect to the X-direction and each extends in a zigzag shape in the X-direction.

[0098] At the same time, if Figure 11 As shown, a configuration is possible in which the third photoresist line 272 of the second photoresist pattern 270 includes a third flat portion 272 c that connects the fifth inclined portion 272 a and the sixth inclined portion 272 b to each other and extends parallel to the Y direction. Furthermore, a configuration is possible in which the fourth photoresist line 274 of the second photoresist pattern 270 includes a fourth flat portion 274 c that connects the seventh inclined portion 274 a and the eighth inclined portion 274 b to each other and extends parallel to the Y direction.

[0099] It is preferable to provide a flat portion connecting the inclined portions of the light resist lines to each other on the light resist lines extending in a direction perpendicular to the stripe direction of the color filter 122 of the first liquid crystal display panel 100. For example, as in the embodiment, when the color filter 122 of the first liquid crystal display panel 100 is a color filter in which color filters of the same color are arranged in the Y direction, it is preferable to provide flat portions (first flat portion 262c and second flat portion 264c) on the first light resist lines 262 and the second light resist lines 264 extending in the X direction. As a result, as Figure 12 As shown, the intersection point P1 of the first inclined portion 262a and the second inclined portion 262b and the intersection point P2 of the third inclined portion 264a and the fourth inclined portion 264b are positioned between the sub-pixels 104 of a specific color (104R and 104B) of the first liquid crystal display panel 100, and therefore, the first light blocking line 262 and the second light blocking line 264 can be prevented from blocking a large amount of light from entering the sub-pixels 104 of a specific color. When the first light blocking line 262 and the second light blocking line 264 block a large amount of light from entering the sub-pixels 104 of a specific color, color shift may occur in the display of the liquid crystal display device 10. Note that for ease of understanding, Figure 12 The second photoresist pattern 270 is omitted.

[0100] A configuration is possible in which the stripe direction of the color filter 122 of the first liquid crystal display panel 100 is the X direction. In this case, it is preferred that the third and fourth light-blocking lines 272 and 274 extending in the Y direction include flat portions (third and fourth flat portions 272c and 274c).

[0101] like Figure 13 As shown, a configuration is possible in which the first photoresist lines 262 and the second photoresist lines 264 of the first photoresist pattern 260 and the third photoresist lines 272 and the fourth photoresist lines 274 of the second photoresist pattern 270 are curved lines.

[0102] In an embodiment, the scan wiring GL forms the first photoresist line 262 and the second photoresist line 264 of the first photoresist pattern 260. It is sufficient that at least one of the first photoresist line 262 or the second photoresist line 264 of the first photoresist pattern 260 is formed by the scan wiring GL. For example, a configuration is possible in which, when the first photoresist line 262 is formed by the scan wiring GL, the second photoresist line 264 is a low-resistance wiring connected to the common electrode CE. A configuration is possible in which the second photoresist line 264 is a photoresist body (photoresist pattern) formed of an organic material having photoresist properties. Furthermore, similarly in the second light-blocking pattern 270, it is sufficient that at least one of the third photoresist line 272 or the fourth photoresist line 274 is formed by the signal wiring DL.

[0103] Furthermore, a configuration is possible in which the first and second photoresist patterns 260 and 270 are provided on the first liquid crystal display panel 100. It is sufficient that the first and second photoresist patterns 260 and 270 are provided on at least one of the first or second liquid crystal display panel 100 and 200.

[0104] The foregoing description has been given of some exemplary embodiments for purposes of illustration. Although the foregoing discussion has presented specific embodiments, those skilled in the art will recognize that changes in form and detail may be made without departing from the broader spirit and scope of the present invention. Accordingly, the description and drawings are to be regarded as illustrative rather than restrictive. This detailed description is therefore not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the scope of the included claims and all equivalents to which such claims are entitled.

Claims

1. A liquid crystal display device, comprising: a first liquid crystal display panel; as well as a second liquid crystal display panel positioned on a side of the first liquid crystal display panel opposite to the viewer-side surface thereof so as to overlap the first liquid crystal display panel, wherein At least one of the first liquid crystal display panel and the second liquid crystal display panel includes a light blocking pattern that is repeatedly arranged and has a light blocking characteristic, The light-blocking pattern includes: a first light-blocking line extending in a predetermined direction, the first light-blocking line including a first inclined portion inclined relative to the predetermined direction and a second inclined portion inclined in a direction opposite to the first inclined portion relative to the predetermined direction; and a second light-blocking line adjacent to the first light-blocking line and line-symmetrical to the first light-blocking line relative to the predetermined direction. At least one of the first light blocking line and the second light blocking line is formed by one of a scan wiring and a signal wiring of the first liquid crystal display panel and the second liquid crystal display panel, and The first inclined portion and the second inclined portion of the first light resist line of one of the first and second liquid crystal display panels are inclined across a plurality of pixels of the other of the first and second liquid crystal display panels.

2. The liquid crystal display device according to claim 1, The first light blocking line includes a flat portion connecting the first inclined portion and the second inclined portion and extending parallel to the predetermined direction.

3. The liquid crystal display device according to claim 2, wherein A stripe direction of the color filter provided on one of the first and second liquid crystal display panels is perpendicular to a direction in which the flat portion of the first photoresist line of the photoresist pattern provided on the other of the first and second liquid crystal display panels extends.

4. The liquid crystal display device according to claim 1 or 2, wherein: The first light-resistance line is a curved line.

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