Liquid crystal display device

Abstract

A liquid crystal display device includes a first liquid crystal display panel and a second liquid crystal display panel. The second liquid crystal display panel includes scan wirings extending in a Z-shape along a predetermined first direction. A period of a bending point of the scan wirings corresponds to a predetermined number of sub-pixels of the first liquid crystal display panel. The predetermined number is greater than a number of colors of sub-pixels arranged along the predetermined first direction in one of first main pixels of the first liquid crystal display panel, and is not a natural number times a number of colors of sub-pixels arranged repeatedly along the predetermined first direction of the first liquid crystal display panel.

Description

LCD display device

[0001] Cross-references to related applications

[0002] This application claims the benefit of Japanese Patent Application No. 2022-019881, filed on February 10, 2022, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure generally relates to liquid crystal display devices. Background Technology

[0004] In the prior art, liquid crystal display devices are known in which multiple liquid crystal display panels are stacked to improve contrast. For example, unexamined Japanese Patent Application Publication No. 2021-535415 (translation of PCT application) describes a display panel including stacked display liquid crystal panels and a light control panel.

[0005] In unexamined Japanese Patent Application Publication No. 2021-535415 (PCT application translation), a display liquid crystal panel performs a display function, and a light control panel controls the light entering the display liquid crystal panel from the backlight. This light control panel includes multiple signal lines (gate lines and data lines). At least a portion of the signal lines in the light control panel are polygonal lines.

[0006] In unexamined Japanese Patent Application Publication No. 2021-535415 (translation of a PCT application), the signal lines of the light control panel are configured as polygonal lines. Therefore, the signal lines of the light control panel and the grid lines (gate lines and data lines) of the liquid crystal display panel are formed with different patterns. As a result, the moiré pattern of the display panel is improved. However, the bending points of the polygonal lines of the light control panel, which extensively block light from the backlight, are located between pixels of a specific color in the liquid crystal display panel (e.g., between green and blue pixels). Because the bending points of the polygonal lines of the light control panel periodically block light entering the pixels of a specific color in the liquid crystal display panel, the brightness of the pixels of that specific color may decrease, and colored moiré patterns may appear in the display panel.

[0007] This disclosure is made in view of the above circumstances, and the object of this disclosure is to provide a liquid crystal display device in which color moiré patterns are suppressed. Summary of the Invention

[0008] To achieve the above objectives, according to a first aspect of this disclosure, a liquid crystal display device includes:

[0009] A first liquid crystal display panel displays a color image, and in the first liquid crystal display panel, first main pixels are arranged in a matrix along a predetermined first direction and a predetermined second direction perpendicular to the predetermined first direction, the first main pixels comprising multiple sub-pixels of different colors; and

[0010] A second liquid crystal display panel, displaying a monochrome image, is located on the side of the first liquid crystal display panel opposite to the observer's side, overlapping the first liquid crystal display panel. In the second liquid crystal display panel, second main pixels are arranged in a matrix along the predetermined first direction and the predetermined second direction.

[0011] The second liquid crystal display panel includes scan lines extending in a Z-shape along the predetermined first direction.

[0012] The period of the bending points of the scan wiring of the second liquid crystal display panel arranged along the predetermined first direction corresponds to a predetermined number of sub-pixels in the first liquid crystal display panel, and

[0013] The predetermined number is greater than the number of colors of sub-pixels arranged along the predetermined first direction in one of the first main pixels of the first liquid crystal display panel, and is not a natural multiple of the number of colors of sub-pixels repeatedly arranged along the predetermined first direction of the first liquid crystal display panel.

[0014] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative, and do not limit this disclosure.

[0015] According to this disclosure, the period of the bends in the scan wiring of the second liquid crystal display panel arranged along the predetermined first direction is a predetermined number of sub-pixels of the first liquid crystal display panel. This predetermined number is greater than the number of colors of the sub-pixels arranged along the predetermined first direction in one of the first main pixels of the first liquid crystal display panel, and is not a natural multiple of the number of colors of the sub-pixels repeatedly arranged along the predetermined first direction of the first liquid crystal display panel. As a result, the colors of the sub-pixels whose incoming light is blocked by the bends change sequentially, thus suppressing color moiré patterns in the liquid crystal display device. Attached Figure Description

[0016] A more complete understanding of this application can be obtained by considering the following detailed description in conjunction with the accompanying drawings, in which:

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

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

[0019] Figure 3 is a cross-sectional view of the liquid crystal display device according to Embodiment 1;

[0020] Figure 4 is a schematic diagram showing the first scan wiring and the first signal wiring of the first liquid crystal display panel according to Embodiment 1;

[0021] Figure 5 is a plan view showing the second liquid crystal display panel according to Embodiment 1;

[0022] Figure 6 is a schematic diagram showing the second scan wiring, second signal wiring, dummy line and sub-pixel of the first liquid crystal display panel in two second main pixels viewed from the front according to Embodiment 1;

[0023] Figure 7 is a schematic diagram showing a second scan line and sub-pixel of a first liquid crystal display panel with four second main pixels viewed from the front according to Embodiment 1;

[0024] Figure 8 is a schematic diagram showing a second scan line and sub-pixel of a first liquid crystal display panel among four second main pixels, viewed from a position closer to the -X side on the front side according to Embodiment 1;

[0025] Figure 9 is a schematic diagram showing a second scan line and sub-pixel of a first liquid crystal display panel among four second main pixels, viewed from the front closer to the +X side according to Embodiment 1.

[0026] Figure 10 is a plan view showing the second scan wiring, second signal wiring, switching elements, etc.

[0027] Figure 11 is a cross-sectional view of the switching element and contact hole taken along line AA as shown in Figure 10;

[0028] Figure 12 is a cross-sectional view of the second scan wiring and dummy line taken along line BB as shown in Figure 10;

[0029] Figure 13 is a block diagram showing the display controller according to Embodiment 1;

[0030] Figure 14 is a schematic diagram showing the second scan wiring and sub-pixels of the first liquid crystal display panel among the four second main pixels according to Embodiment 2, viewed from the front.

[0031] Figure 15 is a schematic diagram showing the second scan wiring and sub-pixels of the first liquid crystal display panel among the four second main pixels according to Embodiment 3, viewed from the front.

[0032] Figure 16 is a plan view showing the first main pixel of the first liquid crystal display panel according to Embodiment 4;

[0033] Figure 17 is a schematic diagram showing the second scan wiring and sub-pixels of the first liquid crystal display panel among the four second main pixels according to Embodiment 4, viewed from the front.

[0034] Figure 18 is a schematic diagram showing the second scan wiring and sub-pixels of the first liquid crystal display panel among the four second main pixels according to Embodiment 5, viewed from the front.

[0035] Figure 19 is a schematic diagram showing the second signal wiring and dummy line according to Embodiment 6;

[0036] Figure 20 is a plan view showing the second liquid crystal display panel according to Embodiment 7;

[0037] Figure 21 is a schematic diagram showing the second scan wiring, second signal wiring, and sub-pixel of a first liquid crystal display panel in a second main pixel according to Embodiment 7;

[0038] Figure 22 is a schematic diagram showing a second scan line and a sub-pixel of a first liquid crystal display panel according to Embodiment 7;

[0039] Figure 23 is a schematic diagram illustrating the pixel electrode according to Embodiment 7; and

[0040] Figure 24 is a schematic diagram showing the second signal wiring and dummy line according to the modified example. Detailed Implementation

[0041] Hereinafter, liquid crystal display devices according to various embodiments will be described with reference to the accompanying drawings.

[0042] Example 1:

[0043] The liquid crystal display device 10 according to this embodiment will be described with reference to FIGS. 1 to 13. The liquid crystal display device 10 displays color images using a first liquid crystal display panel 100 and a second liquid crystal display panel 200, which will be described later.

[0044] As shown in Figure 1, the liquid crystal display device 10 includes a panel portion 50, a backlight 300, and a display controller 400. The panel portion 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 from 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, for ease of understanding, in the liquid crystal display device 10 of Figure 1, the right direction (right direction on the paper) is referred to as the "+X direction," the upward direction (upward direction on the paper) is referred to as the "+Y direction," and the direction perpendicular to the +X and +Y directions (front direction on the paper) is referred to as the "+Z direction." Furthermore, the X direction corresponds to a predetermined first direction, and the Y direction corresponds to a predetermined second direction.

[0045] Panel section

[0046] Panel portion 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 located on the observer side (+Z side). The first liquid crystal display panel 100 displays a color image. The second liquid crystal display panel 200 is located on the side of the first liquid crystal display panel 100 opposite to the observer side surface (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.

[0047] 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).

[0048] As shown in Figure 2, the first liquid crystal display panel 100 includes first main pixels 102 arranged in a matrix along the X and Y directions in a rectangular display area 101. The first main pixels 102 are formed by red pixels 104R emitting red light, green pixels 104G emitting green light, and blue pixels 104B emitting blue light. These pixels are defined in a V-shape by a black matrix BM and arranged along the X direction. The red pixels 104R, green pixels 104G, and blue pixels 104B are divided into two domains 104a and 104b with different rotation directions of the first liquid crystal 130. Domains 104a and 104b are also defined by the black matrix BM. Note that the red pixels 104R, green pixels 104G, blue pixels 104B, and the white pixels 104W described below can be collectively referred to as "sub-pixels 104".

[0049] As shown in Figure 2, in this embodiment, the first main pixel 102 is arranged along the X direction (a predetermined first direction) and the Y direction (a predetermined second direction), and the red pixel 104R, green pixel 104G, and blue pixel 104B of the first main pixel 102 are arranged along the X direction. Thus, in one of the first main pixels 102, the number of colors of the sub-pixels 104 arranged along the X direction is three. The number of colors of the sub-pixels 104 repeatedly arranged along the X direction is also three.

[0050] As shown in Figure 3, the first liquid crystal display panel 100 includes a first TFT substrate 110, a first opposing substrate 120, a first liquid crystal 130, a first polarizing plate 132, a second polarizing plate 134, and a first driving circuit 136. The first TFT substrate 110 and the first opposing substrate 120 sandwich the first liquid crystal 130. The first polarizing plate 132 is disposed on the first TFT substrate 110. The second polarizing plate 134 is disposed on the first opposing substrate 120.

[0051] In one example, the first TFT substrate 110 is implemented as a glass substrate. The TFT for selecting the sub-pixel 104, the common electrode, the pixel electrode, the alignment film for aligning the first liquid crystal 130, etc. (all not shown) are disposed on the main surface 110a of the first liquid crystal 130 side of the first TFT substrate 110.

[0052] Furthermore, multiple common wirings (not shown), multiple first scan wirings GL1, and multiple first signal wirings DL1 are formed on the main surface 110a of the first TFT substrate 110. The common wirings provide a common potential to the common electrode that applies voltage to the first liquid crystal 130. As shown in FIG4, the first scan wirings GL1 extend linearly along the X direction and provide the voltage that enables the TFT to operate. The first signal wirings DL1 extend in a Z-shape along the Y direction along the outline (V-shape) of the sub-pixel 104. The first signal wirings DL1 provide voltage to the pixel electrode that applies voltage to the first liquid crystal 130 via the TFT. The sub-pixel 104 is surrounded by the first scan wirings GL1 and the first signal wirings DL1, and the TFT is disposed at the intersection of the first scan wirings GL1 and DL1. As shown in FIG3, the first polarizing plate 132 is disposed on the main surface 110b of the first TFT substrate 110, on the side opposite to the main surface 110a. Note that in FIG4, the first scan wirings GL1 and the first signal wirings DL1 are illustrated as solid lines. In the following figures, the first scan wiring GL1 and the first signal wiring DL1 can be illustrated as solid lines or dashed lines.

[0053] As shown in Figure 3, the first opposing substrate 120 is opposite to the first TFT substrate 110. The first opposing substrate 120 is adhered to the first TFT substrate 110 by a sealing material 138. In one example, the first opposing 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 disposed on the main surface 120a of the first opposing substrate 120 on the side of the first liquid crystal 130. A second polarizing plate 134 is disposed on the main surface 120b of the first opposing substrate 120, on the side opposite to the main surface 120a. Note that for ease of understanding, the black matrix BM, alignment film, etc., are omitted in Figure 3.

[0054] Color filter 122 is implemented as a striped color filter, wherein color filters of the same color are arranged in the Y direction. The red, green and blue color filters of color filter 122 are surrounded by a black matrix BM, corresponding to red pixel 104R, green pixel 104G and blue pixel 104B, respectively.

[0055] As shown in Figure 2, the black matrix BM defines the first main pixel 102, sub-pixel 104, and domains 104a and 104b. The black matrix BM covers the first scan routing GL1 and the first signal routing DL1. The line segments extending along the X direction of the black matrix BM extend linearly, similar to the first scan routing GL1. The line segments extending along the Y direction of the black matrix BM extend in a Z-shape with the same shape as the first signal routing DL1.

[0056] As shown in Figure 3, a first liquid crystal 130 is sandwiched between a first TFT substrate 110 and a first opposing substrate 120. In one example, the first liquid crystal 130 is implemented as a non-nematic liquid crystal. The first liquid crystal 130 is initially aligned in a direction 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 in a plane parallel to the main surface 110a of the first TFT substrate 110.

[0057] 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 opposing substrate 120. One of the transmission axes of the first polarizing plate 132 and the second polarizing plate 134 is arranged parallel to the initial alignment direction of the first liquid crystal 130. The transmission axis of the first polarizing plate 132 is orthogonal to the transmission axis of the second polarizing plate 134. The first polarizing plate 132 is adhered to the second opposing substrate 220 of the second liquid crystal display panel 200 described below by a light-transmitting adhesive layer 150. In one example, the adhesive layer 150 is implemented as an optically clear adhesive (OCA).

[0058] The first driving circuit 136 is disposed on the main surface 110a of the first TFT substrate 110. The first driving circuit 136 provides voltage to the first scan wiring GL1, the first signal wiring DL1 and the common wiring based on the color image signal provided from the display controller 400.

[0059] Second LCD display panel

[0060] As shown in Figure 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 adhered to the first liquid crystal display panel 100 by an adhesive layer 150. The second liquid crystal display panel 200 displays a monochrome image.

[0061] 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 the switching element 240 described below. As shown in FIG5, the second liquid crystal display panel 200 includes second main pixels 202 arranged in a matrix along the X and Y directions. In this embodiment, one second main pixel 202 of the second liquid crystal display panel 200 corresponds to 16 (4 in the X direction and 4 in the Y direction) first main pixels 102 of the first liquid crystal display panel 100, and one second main pixel 202 of the second liquid crystal display panel 200 emits light to the 16 first main pixels 102 of the first liquid crystal display panel 100.

[0062] As shown in Figure 3, the second liquid crystal display panel 200 includes a second TFT substrate 210, a second opposing substrate 220, a second liquid crystal 230, a third polarizing plate 232, and a second driving circuit 236. The second TFT substrate 210 and the second opposing substrate 220 sandwich the second liquid crystal 230. The third polarizing plate 232 is disposed 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 the polarizing plate on the light-emitting side of the second liquid crystal display panel 200. Additionally, note that the second liquid crystal display panel 200 does not have a color filter or a black matrix.

[0063] In one example, the second TFT substrate 210 is implemented as a glass substrate. Multiple second scan lines GL2; multiple second signal lines DL2; multiple dummy lines DM; a common line (not shown); a switching element 240, a pixel electrode 250, and a common electrode CE for the second main pixel 202; and an alignment film (not shown) for aligning the second liquid crystal 230 are formed on the main surface 210a of the second TFT substrate 210. The common line provides a common potential to the common electrode CE, which applies voltage to the second liquid crystal 230. The second scan lines GL2 provide a voltage to operate the switching element 240. The second signal lines DL2 provide a voltage to the pixel electrode 250, which applies voltage to the second liquid crystal 230, via the switching element 240. The dummy lines DM are formed of a material that blocks light entering from the backlight 300. The dummy lines DM and the second signal lines DL2 form a first light-shielding pattern 260, as described below. A third polarizer 232 is disposed on the main surface 210b of the second TFT substrate 210, on the side opposite to the main surface 210a. The configuration of the second scan routing GL2, the second signal routing DL2, the dummy line DM, the second main pixel 202 (switching element 240, common electrode CE and pixel electrode 250) will be described later.

[0064] The second opposing substrate 220 is opposite to the second TFT substrate 210. The second opposing substrate 220 is adhered to the second TFT substrate 210 by a sealing material 238. In one example, the second opposing substrate 220 is implemented as 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 opposing substrate 220 on the side of the second liquid crystal 230. An adhesive layer 150 is provided on the main surface 220b of the second opposing substrate 220, on the side opposite to the main surface 220a. The second opposing substrate 220 is adhered to the first liquid crystal display panel 100 (first polarizing plate 132) via the adhesive layer 150.

[0065] The second liquid crystal 230 is sandwiched between the second TFT substrate 210 and the second opposing substrate 220. The second liquid crystal 230 is implemented as a positive nematic liquid crystal. The second liquid crystal 230 is initially aligned in the Y direction by an alignment film. Due to the application of voltage, the second liquid crystal 230 rotates in a plane parallel to the main surface 210a of the second TFT substrate 210.

[0066] The third polarizing plate 232 is disposed on the main surface 210b of the second TFT substrate 210. The light transmission axis of the third polarizing plate 232 is arranged parallel to the initial alignment direction of the second liquid crystal 230. In addition, the light transmission axis of the third polarizing plate 232 of the first liquid crystal display panel 100 is orthogonal to the light transmission axis of the first polarizing plate 132 (the polarizing plate on the light-emitting side of the second liquid crystal display panel 200), and the second liquid crystal display panel 200 operates in normal black mode.

[0067] The second driving circuit 236 is disposed on the main surface 210a of the second TFT substrate 210. The second driving circuit 236 provides voltage to the second scan wiring GL2, the second signal wiring DL2 and the common wiring based on the signal provided from the display controller 400.

[0068] Next, the second scan wiring GL2, the second signal wiring DL2, and the dummy line DM will be described with reference to Figures 5 to 9. Figure 6 shows one of the second scan wiring GL2, the second signal wiring DL2, the dummy line DM, and the sub-pixel 104 of the first liquid crystal display panel 100 in two second main pixels 202 viewed from the front. Figure 7 shows one of the second scan wiring GL2 and the sub-pixel 104 of the first liquid crystal display panel 100 in four second main pixels 202. In Figure 7 and the following figures, for ease of understanding, a sub-pixel 104 of the first liquid crystal display panel 100 can be shown as a rectangle. Furthermore, in the following figures, since the sub-pixel 104 is shown as a rectangle, the curved second signal wiring DL2 can be shown as a straight line segment. In addition, the bending points P1 to P10 of the second scan line GL2 described below can be collectively referred to as bending points P.

[0069] Next, the relationship between the second scan line GL2 and the sub-pixels 104 of the first liquid crystal display panel 100 will be described. As shown in Figures 5 and 6, the second scan line GL2 passes through the interior of the second main pixel 202. The second scan line GL2 bends at the +Y side end and the -Y side end of the second main pixel 202 and extends in a Z-shape along the X direction. In this embodiment, when the liquid crystal display device 10 is viewed from the front (i.e., when viewed from the +Z direction), as shown in Figure 6, the bending point P of the second scan line GL2 is located within the second main pixel 202 between the sub-pixels 104 of the first liquid crystal display panel 100.

[0070] The bending point P of the second scan wiring GL2 is arranged along the X direction (a predetermined first direction) at a period corresponding to a predetermined number N of sub-pixels 104 of the first liquid crystal display panel 100. The predetermined number N is greater than the number (three) of colors of sub-pixels 104 arranged along the X direction in one of the first main pixels 102 of the first liquid crystal display panel 100, and is not a natural number multiple of the number (three) of colors of sub-pixels 104 repeatedly arranged along the X direction of the first liquid crystal display panel 100. Furthermore, when the natural number is n and the real number is m, the predetermined number N is represented by the following equations (1) and (2). In this embodiment, as shown in FIG6 and FIG7, the case where the predetermined number N is 13 (n = 4, m = 1) is described.

[0071] N = 3×n+m (1)

[0072] 0 < m < 3 (2)

[0073] As shown in Figure 7, in this embodiment, the extension of the second scan wiring GL2 corresponds to six or seven sub-pixels 104 (e.g., seven between bending points P1 and P2, and six between bending points P2 and P3) and bends. The bending points P1, P3, P5, and P7 arranged along the X direction, as well as the bending points P2, P4, P6, and P8 arranged along the X direction, are each arranged with a period corresponding to 13 sub-pixels 104. In the arrangement of bending points P1 to P7, the period corresponds to 13 sub-pixels 104. Therefore, when bending point P1 is located between blue pixel 104B and red pixel 104R, bending point P3 is located between red pixel 104R and green pixel 104G, bending point P5 is located between green pixel 104G and blue pixel 104B, and bending point P7 is located between blue pixel 104B and red pixel 104R. In the arrangement of bending points P2 to P8, bending point P2 is located between red pixel 104R and green pixel 104G, bending point P4 is located between green pixel 104G and blue pixel 104B, bending point P6 is located between blue pixel 104B and red pixel 104R, and bending point P8 is located between red pixel 104R and green pixel 104G.

[0074] In other words, in this embodiment, the color of the sub-pixel 104 sandwiched by the curved point P arranged along the X direction changes sequentially. The curved point P blocks the light entering the sub-pixel 104 from the backlight 300 into the first liquid crystal display panel 100. Therefore, the color of the sub-pixel 104 whose light is blocked by the curved point P changes sequentially.

[0075] As the color of sub-pixels 104, whose incoming light is blocked by the bending point P, changes sequentially, the decrease in color brightness of sub-pixels 104 caused by the blocking of incident light (color deviation caused by color mixing) is averaged out in the display area 101 of the first liquid crystal display panel 100. As a result, color moiré patterns in the liquid crystal display device 10 can be suppressed.

[0076] Furthermore, in this embodiment, as shown in FIG8, even when the liquid crystal display device 10 is viewed from the front from a position closer to the -X side, the position of the curved point P changes uniformly when viewed from the front. Therefore, the color of the sub-pixel 104 sandwiching the curved point P arranged along the X direction changes sequentially. Furthermore, as shown in FIG9, even when the liquid crystal display device 10 is viewed from the front from a position closer to the +X side, the color of the sub-pixel 104 sandwiching the curved point P arranged along the X direction also changes sequentially. Therefore, even when the observer's position changes, color moiré patterns in the liquid crystal display device 10 can be suppressed.

[0077] Next, the relationship between the sub-pixels 104 of the first liquid crystal display panel 100 and the second signal wiring DL2 and dummy line DM will be described. When the liquid crystal display device 10 is viewed from the front, as shown in FIG6, the second signal wiring DL2 is located between the sub-pixels 104 of the first liquid crystal display panel 100 and extends along the Y direction, while bending along the outline of the sub-pixels 104 of the first liquid crystal display panel 100. Furthermore, the second signal wiring DL2 overlaps with the first signal wiring DL1 of the first liquid crystal display panel 100. Similar to the second signal wiring DL2, the dummy line DM is also located between the sub-pixels 104 of the first liquid crystal display panel 100 and extends along the Y direction, while bending along the outline of the sub-pixels 104 of the first liquid crystal display panel 100. The dummy line DM also overlaps with the first signal wiring DL1 of the first liquid crystal display panel 100.

[0078] In this embodiment, as shown in FIG5, two dummy lines DM are disposed between two second signal wirings DL2, and the second signal wirings DL2 and the dummy lines DM form a first light-shielding pattern 260 that blocks light entering from the backlight 300. When the liquid crystal display device 10 is viewed from the front, as shown in FIG6, the second signal wirings DL2 and dummy lines DM (i.e., the first light-shielding pattern 260) are disposed every four sub-pixels 104, and the number of colors (three) of the sub-pixels 104 arranged repeatedly along the X direction is one greater than that of the other three.

[0079] In this 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, and is larger than one of the first main pixels 102 of the first liquid crystal display panel 100. Therefore, when only one of the second signal wirings DL2 corresponding to one of the second main pixels 202 is set as a wiring with light-shielding characteristics and extending in the Y direction, the spatial frequency of the dark line formed by the wiring with light-shielding characteristics and extending in the Y direction is reduced, and the dark line is more likely to be identified by the observer. In this embodiment, when the liquid crystal display device 10 is viewed from the front, the second signal wirings DL2 forming the first light-shielding pattern 260 and the dummy line DM are provided every four sub-pixels 104 of the first liquid crystal display panel 100, so the spatial frequency of the dark line formed by the wiring with light-shielding characteristics and extending in the Y direction can be increased, and the dark line can be made more difficult for the observer to identify.

[0080] Next, referring to Figures 10 to 12, we will describe the second scan wiring GL2, the second signal wiring DL2, the dummy line DM, the switching element 240, the pixel electrode 250, and the common electrode CE of the second main pixel 202. Figure 10 is a plan view showing one of the second scan wiring GL2, one of the second signal wiring DL2, one of the switching elements 240, and so on. Figure 11 is a cross-sectional view of the switching element 240 and the contact hole CH shown in Figure 10 along line AA. Figure 12 is a cross-sectional view of one of the second scan wiring GL2 and the dummy line DM shown in Figure 10 along line BB. Note that for ease of understanding, the common electrode CE is omitted in Figure 10, and the shading of the third insulating layer 278 is omitted in Figures 11 and 12.

[0081] As shown in Figure 11, a second scan wiring GL2 is formed on the main surface 210a of the second TFT substrate 210. The second scan wiring GL2 is covered by a first insulating layer 272. A second signal wiring DL2 is formed on the first insulating layer 272. The second signal wiring DL2 is covered by a second insulating layer 274. The second scan wiring GL2 and the second signal wiring DL2 are formed of metals such as aluminum (Al) and molybdenum (Mo).

[0082] As shown in Figures 11 and 12, the common electrode CE is formed on an organic interlayer film 276 formed on the second insulating layer 274. In one example, the common electrode CE is formed of indium tin oxide (ITO). The common electrode CE is covered by a third insulating layer 278.

[0083] Switching element 240 is disposed near the second scan wiring GL2. As shown in Figures 10 and 11, each switching element 240 includes a gate 242, a semiconductor layer 244, a source 246, and a drain 248. In one example, the switching element 240 is implemented as a TFT element.

[0084] Gate 242 is integrally formed with the second scan wiring GL2 on the main surface 210a of the second TFT substrate 210. Like the second scan wiring GL2, gate 242 is covered by a first insulating layer 272. A semiconductor layer 244 is disposed on gate 242 in an island-like manner via the first insulating layer 272. In one example, semiconductor layer 244 is formed of amorphous silicon. Source 246 branches from the second signal wiring DL2 and is formed on semiconductor layer 244. Drain 248 extends from semiconductor layer 244 along the second scan wiring GL2. Drain 248 is connected to pixel electrode 250 via contact holes CH penetrating the third insulating layer 278, organic interlayer film 276, and second insulating layer 274. Like the second signal wiring DL2, source 246 and drain 248 are formed of metals such as aluminum (Al) and molybdenum (Mo). Furthermore, as shown in FIG11, semiconductor layer 244, source 246, and drain 248 are covered by the second insulating layer 274.

[0085] As shown in Figure 12, the dummy line DM is formed on the organic interlayer film 276 and is covered by the common electrode CE. The dummy line DM is formed of a metal such as aluminum (Al) or molybdenum (Mo). The dummy line DM does not need to be conductive and can be formed of an organic material with light-shielding properties. Furthermore, in this embodiment, as shown in Figures 10 and 12, the dummy device 240D corresponding to the dummy of the switching element 240 is formed at a position facing the switching element 240, just like the dummy line DM.

[0086] As shown in Figures 11 and 12, the first insulating layer 272 covers the second scan wiring GL2 and the gate 242 of the switching element 240. The second insulating layer 274 covers the semiconductor layer 244, source 246, and drain 248 of the switching element 240, the second signal wiring DL2, and the first insulating layer 272. The organic interlayer film 276 is formed on the second insulating layer 274 by photosensitive resin. The third insulating layer 278 covers the common electrode CE and the organic interlayer film 276. The first insulating layer 272, the second insulating layer 274, and the third insulating layer 278 are formed of silicon nitride (SiNx), silicon oxide (SiOx), etc.

[0087] Pixel electrode 250 is connected to switching element 240 via contact hole CH. Pixel electrode 250 has a comb-like shape, and the teeth 252 are inclined relative to the Y direction. In one example, pixel electrode 250 is formed of ITO.

[0088] Backlight

[0089] As shown in Figure 1, the backlight 300 is disposed on the back 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 diffuser, etc. (none of which are shown in the figure).

[0090] Display Controller

[0091] The display controller 400 controls the display of the first liquid crystal display panel 100 and the second liquid crystal display panel 200. As shown in FIG13, 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.

[0092] Image data distributor 410 distributes input image data to first image signal generator 420 and second image brightness signal generator 430.

[0093] The first image signal generator 420 generates a color image to be displayed on the first liquid crystal display panel 100 based on the input image data allocated 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 with brightness grayscale characteristics suitable for the first liquid crystal display panel 100. In one example, a lookup table in which a preset input / output relationship is used in the data conversion. The first image signal generator 420 sends a color image signal representing the generated color image to the first driving circuit 136 of the first liquid crystal display panel 100.

[0094] The second image luminance signal generator 430 generates a luminance signal based on the input image data allocated from the image data distributor 410. This luminance signal is used to generate a monochrome image to be displayed on the second liquid crystal display panel 200. In one example, the second image luminance signal generator 430 calculates the luminance level of a second main pixel 202 of the second liquid crystal display panel 200 from the average, frequency, minimum, and maximum values ​​of the red, green, and blue gradient values ​​of the 16 first main pixels 102 of the first liquid crystal display panel 100. Light emitted from the second main pixel 202 of the second liquid crystal display panel 200 enters the first liquid crystal display panel 100. The calculated luminance level can be a grayscale value. The second image luminance signal generator 430 sends a luminance signal representing the calculated luminance level to the second image signal generator 440.

[0095] The second image signal generator 440 generates a monochrome image to be displayed on the second liquid crystal display panel 200 based on the luminance signal sent from the second image luminance signal generator 430. In one example, the second image signal generator 440 generates a monochrome image that has undergone averaging and grayscale conversion. Specifically, in one example, the calculator 442 of the second image signal generator 440 uses a weighted average based on the distance from the target second main pixel 202 to average the luminance level of the second main pixel 202 located within a predetermined distance from the target second main pixel 202. As a result, the second image signal generator 440 can generate a monochrome image with blurred edges. Furthermore, the second grayscale converter 444 of the second image signal generator 440 generates monochrome image data with luminance-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.

[0096] The monochrome image signal sent to the second liquid crystal display panel 200 is delayed relative to the color image signal sent to the first liquid crystal display panel 100 due to the brightness level calculation and averaging processes performed by the second image brightness signal generator 430. Thus, the display controller 400 includes a synchronization circuit (not shown) for synchronously outputting the monochrome image signal and the color image signal. Because of 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; therefore, an appropriate color image is displayed on the liquid crystal display device 10.

[0097] The display controller 400 is configured with a central processing unit (CPU), memory, etc. In one example, the CPU executes a program stored in memory to implement the functions of the display controller 400.

[0098] As described above, the predetermined number N of the bending points P of the second scan wiring GL2 (N = 13 in this embodiment) is greater than the number (three) of colors of the sub-pixels 104 arranged along the X direction (a predetermined first direction) in one of the first main pixels 102 of the first liquid crystal display panel 100, and is not a natural multiple of the number (three) of colors of the sub-pixels 104 repeatedly arranged along the X direction of the first liquid crystal display panel 100. Thus, the colors of the sub-pixels 104 whose incident light is blocked by the bending points P change sequentially. As a result, the reduction in color brightness of the sub-pixels 104 caused by the blocking of incident light (color deviation caused by color mixing) on ​​the display area 101 of the first liquid crystal display panel 100 is averaged out, and color moiré patterns of the liquid crystal display device 10 can be suppressed. Furthermore, color moiré patterns of the liquid crystal display device 10 can be suppressed even when the observer's position changes.

[0099] Furthermore, a first light-shielding pattern 260, formed by the second signal wiring DL2 and the dummy line DM and extending along the Y direction (a predetermined second direction), is provided every four sub-pixels 104. The number of colors (three) of the sub-pixels 104 arranged repeatedly along the X direction is one greater than that of the other sub-pixels 104. In this way, the spatial frequency of dark lines formed by wiring with light-shielding properties and extending along the Y direction can be increased, and dark lines appearing in the liquid crystal display device 10 can be made more difficult for the observer to identify.

[0100] Example 2:

[0101] In Embodiment 1, the bending points P of the second scan wiring GL2 are arranged along the X direction at a period of 13 (n=3, m=1) sub-pixels 104 of the first liquid crystal display panel 100. However, a configuration with a predetermined number N of 14 (n=3, m=2) is possible. Other configurations in this embodiment are the same as those described in Embodiment 1.

[0102] For example, when the predetermined number N is 14, as shown in Figure 14, the extension of the second scan wiring GL2 corresponds to seven sub-pixels 104 and is curved. In addition, the curved points P1, P3 and P5, P7 arranged along the X direction and the curved points P2, P4, P6 arranged along the X direction are each arranged with a period corresponding to the 14 sub-pixels 104.

[0103] In the arrangement of bending points P1 to P7, the period corresponds to 14 sub-pixels 104. Therefore, when bending point P1 is located between blue pixel 104B and red pixel 104R, bending point P3 is located between green pixel 104G and blue pixel 104B, bending point P5 is located between red pixel 104R and green pixel 104G, and bending point P7 is located between blue pixel 104B and red pixel 104R. In the arrangement of bending points P2, P4, and P6, bending point P2 is located between red pixel 104R and green pixel 104G, bending point P4 is located between blue pixel 104B and red pixel 104R, and bending point P6 is located between green pixel 104G and blue pixel 104B.

[0104] In other words, in this embodiment, as in Embodiment 1, the color of the sub-pixel 104 sandwiched by the curved point P arranged along the X direction changes sequentially. Therefore, also in this embodiment, on the display area 101 of the first liquid crystal display panel 100, the reduction in color brightness of the sub-pixel 104 (color deviation caused by color mixing) is averaged out, and the color moiré pattern of the liquid crystal display device 10 can be suppressed.

[0105] Therefore, even when the predetermined number N is 14 (n = 3, m = 2), the color moiré pattern of the liquid crystal display device 10 can be suppressed.

[0106] Example 3:

[0107] In Embodiment 1, the first main pixel 102 of the first liquid crystal display panel 100 is formed by a red pixel 104R, a green pixel 104G, and a blue pixel 104B arranged along the X direction. However, as shown in FIG15, it is possible for the first main pixel 102 of the first liquid crystal display panel 100 to be formed by a red pixel 104R, a green pixel 104G, a blue pixel 104B, and a white pixel 104W arranged along the X direction. The white pixel 104W emits white light.

[0108] In this embodiment, the first main pixel 102 is arranged along the X and Y directions, and the red pixel 104R, green pixel 104G, blue pixel 104B, and white pixel 104W of the first main pixel 104 are arranged along the X direction. Thus, in one of the first main pixels 102, the number of colors of the sub-pixels 104 arranged along the X direction is four. The number of colors of the sub-pixels 104 repeatedly arranged along the X direction is also four. The other structures of the first liquid crystal display panel 100 in this embodiment are the same as in Embodiment 1.

[0109] As shown in FIG15, in the second liquid crystal display panel 200 of this embodiment, two dummy lines DM are disposed between two second signal wirings DL2. When the liquid crystal display device 10 is viewed from the front, as shown in FIG15, the second signal wirings DL2 and dummy lines DM (i.e., the first light-shielding pattern 260) are disposed every five sub-pixels 104, and the number of colors (four) of the sub-pixels 104 arranged repeatedly along the X direction is one greater than the number of colors (four) of the sub-pixels 104 arranged repeatedly along the X direction.

[0110] Similarly, in the second liquid crystal display panel 200 of this embodiment, the bending point P of the second scan wiring GL2 is arranged along the X direction with a period corresponding to a predetermined number N of sub-pixels 104 of the first liquid crystal display panel 100. The predetermined number N in this embodiment is greater than the number (four) of colors of the sub-pixels 104 arranged along the X direction in one of the first main pixels 102 of the first liquid crystal display panel 100, and is not a natural number multiple of the number (four) of colors of the sub-pixels 104 repeatedly arranged along the X direction of the first liquid crystal display panel 100. Furthermore, when the natural number is n and the real number is m, the predetermined number N is represented by the following equations (3) and (4). In this embodiment, as shown in FIG15, the case where the predetermined number N is 15 (n = 3, m = 3) is described. Other configurations of the second liquid crystal display panel 200, as well as the configurations of the backlight 300 and the display controller 400, are the same as in Embodiment 1.

[0111] N = 4×n+m (3)

[0112] 0 < m < 4 (4)

[0113] For example, as shown in Figure 15, when the predetermined number N is 15, the extension of the second scan wiring GL2 corresponds to seven or eight sub-pixels 104 (e.g., seven between bending points P1 and P2, and eight between bending points P2 and P3) and is curved. The bending points P1, P3, P5, P7, P9 arranged along the X direction and the bending points P2, P4, P6, P8 arranged along the X direction are each arranged with a period corresponding to 15 sub-pixels 104.

[0114] In the arrangement of bending points P1 to P9, the period corresponds to 15 sub-pixels 104. Therefore, when bending point P1 is located between red pixel 104R and green pixel 104G, bending point P3 is located between white pixel 104W and red pixel 104R, and bending point P5 is located between blue pixel 104B and white pixel 104W. Furthermore, bending point P7 is located between green pixel 104G and blue pixel 104B, and bending point P9 is located between red pixel 104R and green pixel 104G.

[0115] In the arrangement of bending points P2 to P8, bending point P2 is located between white pixel 104W and red pixel 104R, and bending point P4 is located between blue pixel 104B and white pixel 104W. Furthermore, bending point P6 is located between green pixel 104G and blue pixel 104B, and bending point P8 is located between red pixel 104R and green pixel 104G.

[0116] Therefore, in this embodiment, as in Embodiment 1, the color of the sub-pixel 104 sandwiched by the curved point P arranged along the X direction changes sequentially. Thus, also in this embodiment, on the display area 101 of the first liquid crystal display panel 100, the reduction in color brightness of the sub-pixel 104 (color deviation caused by color mixing) is averaged out, and color moiré patterns of the liquid crystal display device 10 can be suppressed.

[0117] Therefore, in this embodiment, a second signal wiring DL2 and a dummy line DM (first light-shielding pattern 260) are provided for every five sub-pixels 104 of the first liquid crystal display panel 100. This can increase the spatial frequency of the dark lines formed by the wiring with light-shielding characteristics and extending along the Y direction, and make it more difficult for the observer to identify the dark lines.

[0118] Example 4:

[0119] In embodiment 3, the red pixel 104R, green pixel 104G, blue pixel 104B, and white pixel 104W, which form one of the first main pixels 102 of the first liquid crystal display panel 100, are arranged in a row along the X direction. However, it is possible to arrange the red pixel 104R, green pixel 104G, blue pixel 104B, and white pixel 104W, which form one of the first main pixels 102 of the first liquid crystal display panel 100, in two rows along the X direction.

[0120] In this embodiment, the configuration of the first main pixel 102 of the first liquid crystal display panel 100 and the curvature of the second scan wiring GL2 of the second liquid crystal display panel 200 differ from the configuration of the first main pixel 102 and the curvature of the second scan wiring GL2 in Embodiment 3. Other configurations of the liquid crystal display device 10 are the same as in Embodiments 1 and 3.

[0121] As shown in Figure 16, the first liquid crystal display panel 100 of this embodiment includes a first main pixel 102a and a first main pixel 102b, which serve as first main pixels 102. The first main pixels 102a and 102b are arranged alternately along the X direction. The first main pixels 102a or 102b are arranged in a row along the Y direction.

[0122] In the first main pixel 102a, red pixels 104R and green pixels 104G are arranged in the first row along the X direction, while blue pixels 104B and white pixels 104W are arranged in the second row along the X direction. In the first main pixel 102b, blue pixels 104B and white pixels 104W are arranged in the first row along the X direction, while red pixels 104R and green pixels 104G are arranged in the second row along the X direction.

[0123] In this embodiment, the first main pixels 102a and 102b are arranged alternately along the X direction. Red pixels 104R and green pixels 104G are arranged in the first row of the first main pixels 102a, while blue pixels 104B and white pixels 104W are arranged in the first row of the first main pixels 102b. Furthermore, blue pixels 104B and white pixels 104W are arranged in the second row of the first main pixels 102a, and red pixels 104R and green pixels 104G are arranged in the second row of the first main pixels 102b. Therefore, in this embodiment, the number of colors of the sub-pixels 104 arranged along the X direction in one of the first main pixels 102a and 102b is two (red pixels 104R and green pixels 104G, or blue pixels 104B and white pixels 104W), and the number of colors of the sub-pixels 104 repeatedly arranged along the X direction is four (red pixels 104R, green pixels 104G, blue pixels 104B, and white pixels 104W).

[0124] In this embodiment, in the second liquid crystal display panel 200, one second main pixel 202 of the second liquid crystal display panel 200 corresponds to 16 (8 in the X direction and 2 in the Y direction) first main pixels 102 of the first liquid crystal display panel 100, and one second main pixel 202 of the second liquid crystal display panel 200 emits light to the 16 first main pixels 102 of the first liquid crystal display panel 100.

[0125] Similarly, in the second liquid crystal display panel 200 of this embodiment, the bending point P of the second scan wiring GL2 is arranged along the X direction with a period corresponding to a predetermined number N of sub-pixels 104 of the first liquid crystal display panel 100. In this embodiment, the predetermined number N is greater than (ii) the number of colors of the sub-pixels 104 arranged along the X direction in one of the first main pixels 102 of the first liquid crystal display panel 100, and is not a natural number multiple of (iv) the number of colors of the sub-pixels 104 repeatedly arranged along the X direction of the first liquid crystal display panel 100. In this case, when the natural number is n and the real number is m, the predetermined number N satisfies the following equations (5) and (6). In this embodiment, as shown in FIG17, the case where the predetermined number N is 13 (n = 6, m = 1) is described.

[0126] N = 2×n+m (5)

[0127] 0 < m < 2 (6)

[0128] For example, as shown in Figure 17, when the predetermined number N is 13, the extension of the second scan wiring GL2 corresponds to six or seven sub-pixels 104 (e.g., seven between bending points P1 and P2, and six between bending points P2 and P3) and is curved. The bending points P1, P3, P5, P7, P9 arranged along the X direction and the bending points P2, P4, P6, P8, P10 arranged along the X direction are each arranged with a period corresponding to 13 sub-pixels 104.

[0129] In the arrangement of bending points P1 to P9, when bending point P1 is located between blue pixel 104B and white pixel 104W, bending point P3 is located between white pixel 104W and red pixel 104R, and bending point P5 is located between red pixel 104R and green pixel 104G. Furthermore, bending point P7 is located between green pixel 104G and blue pixel 104B, and bending point P9 is located between blue pixel 104B and white pixel 104W.

[0130] In the arrangement of bending points P2 to P10, bending point P2 is located between white pixel 104W and red pixel 104R, bending point P4 is located between red pixel 104R and green pixel 104G, and bending point P6 is located between green pixel 104G and blue pixel 104B. Furthermore, bending point P8 is located between blue pixel 104B and white pixel 104W, and bending point P10 is located between white pixel 104W and red pixel 104R.

[0131] Therefore, in this embodiment, as in Embodiment 1, the color of the sub-pixel 104 sandwiched by the curved point P arranged along the X direction changes sequentially. Thus, also in this embodiment, on the display area 101 of the first liquid crystal display panel 100, the reduction in color brightness of the sub-pixel 104 (color deviation caused by color mixing) is averaged out, and color moiré patterns of the liquid crystal display device 10 can be suppressed. Note that in this embodiment, as in Embodiment 3, a second signal wiring DL2 and a dummy line DM (first light-shielding pattern 260) are provided every five sub-pixels 104 of the first liquid crystal display panel 100.

[0132] Example 5

[0133] One possible configuration is, as in Embodiment 4, where the predetermined number N is greater than (ii) the number of colors of the sub-pixels 104 arranged along the X direction in one of the first main pixels 102 of the first liquid crystal display panel 100, and is not a natural multiple of the number of colors of the sub-pixels 104 repeatedly arranged along the X direction of the first liquid crystal display panel 100 (iv), and the predetermined number N satisfies the following equation (7) and the equation (6) described above. In this embodiment, as shown in FIG18, the case where the predetermined number N is 14 (n = 3, m = 1, N is a natural number, and m is a real number) is described.

[0134] N = 2×(2×n+m) (7)

[0135] For example, when the predetermined number N is 14, as shown in Figure 18, the extension of the second scan wiring GL2 corresponds to seven sub-pixels 104 and is curved. In addition, the curved points P1, P3, P5, P7, P9 arranged along the X direction and the curved points P2, P4, P6, P8, P10 arranged along the X direction are each arranged with a period corresponding to the 14 sub-pixels 104.

[0136] In the arrangement of bending points P1 to P9, bending point P1 is located between blue pixel 104B and white pixel 104W, bending point P3 is located between red pixel 104R and green pixel 104G, and bending point P5 is located between blue pixel 104B and white pixel 104W. Furthermore, bending point P7 is located between red pixel 104R and green pixel 104G, and bending point P9 is located between blue pixel 104B and white pixel 104W.

[0137] In the arrangement of bending points P2 to P10, bending point P2 is located between white pixel 104W and red pixel 104R, bending point P4 is located between green pixel 104G and blue pixel 104B, and bending point P6 is located between white pixel 104W and red pixel 104R. Furthermore, bending point P8 is located between green pixel 104G and blue pixel 104B, and bending point P10 is located between white pixel 104W and red pixel 104R.

[0138] Therefore, as in Embodiments 1 to 4, in this embodiment, the color of the sub-pixel 104 sandwiched by the curved point P arranged along the X direction also changes sequentially. Therefore, also in this embodiment, on the display area 101 of the first liquid crystal display panel 100, the reduction in color brightness of the sub-pixel 104 (color deviation caused by color mixing) is averaged out, and color moiré patterns of the liquid crystal display device 10 can be suppressed. Note that in this embodiment, as in Embodiments 3 and 4, a second signal wiring DL2 and a dummy line DM (first light-shielding pattern 260) are provided every five sub-pixels 104 of the first liquid crystal display panel 100.

[0139] Example 6:

[0140] In embodiments 1 to 5, the second signal wiring DL2 and the dummy line DM (first light-shielding pattern 260) of the second liquid crystal display panel 200 are located between the sub-pixels 104 of the first liquid crystal display panel 100 and extend along the Y direction, while bending along the outline of the sub-pixels 104 of the first liquid crystal display panel 100. However, it is possible for the second signal wiring DL2 and the dummy line DM of the second liquid crystal display panel 200 to be arranged across the sub-pixels 104 of the first liquid crystal display panel 100 at an angle relative to the Y direction.

[0141] The configuration of the first liquid crystal display panel 100 in this embodiment is the same as that of the first liquid crystal display panel 100 in Embodiment 1. Furthermore, except for the second signal wiring DL2 and the dummy line DM, the configuration of the second liquid crystal display panel 200 in this embodiment is the same as that of the second liquid crystal display panel 200 in Embodiment 1. Thus, the second signal wiring DL2 and the dummy line DM of the second liquid crystal display panel 200 will be described with reference to FIG19.

[0142] Similar to the second signal wiring DL2 and dummy line DM in Embodiment 1, in this embodiment, two of the dummy lines DM are disposed between the two second signal wirings DL2. Furthermore, in this embodiment, the second signal wirings DL2 and dummy lines DM are arranged in a period corresponding to the four sub-pixels 104 of the first liquid crystal display panel 100, forming a second light-shielding pattern 280 that blocks light entering from the backlight 300.

[0143] In this embodiment, as shown in FIG19, for each of the second main pixels 202 of the second liquid crystal display panel 200, the second signal wiring DL2 and the dummy line DM (second light-shielding pattern 280) cross two rows of sub-pixels 104 extending along the Y direction of the first liquid crystal display panel 100 and are inclined at an acute angle to the +Y direction. The inclined portion 282, which is inclined at an acute angle relative to the +Y direction, crosses the two rows of sub-pixels 104 extending along the Y direction and passes through four sub-pixels 104 by an inclination corresponding to one sub-pixel 104. The two inclined portions 282 are connected by a flat portion 284 parallel to the X direction.

[0144] In this embodiment, the second light-shielding pattern 280 (the second signal wiring DL2 and the dummy line DM) spans two rows of sub-pixels 104 extending along the Y direction and is tilted relative to the Y direction. Thus, even if the observer's position changes, the color of the sub-pixels 104 of the first liquid crystal display panel 100, whose light is blocked by the second light-shielding pattern 280, remains almost unchanged. Therefore, color moiré patterns in the liquid crystal display device 10 that occur due to changes in the observer's position can be suppressed.

[0145] Example 7:

[0146] In embodiments 1 to 6, the second main pixel 202 of the second liquid crystal display panel 200 has a rectangular shape. However, the shape of the second main pixel 202 of the second liquid crystal display panel 200 is not limited to a rectangle.

[0147] The configuration of the first liquid crystal display panel 100, the backlight 300, and the display controller 400 in this embodiment are the same as those in Embodiment 1. Thus, the second liquid crystal display panel 200 of this embodiment will be described.

[0148] As shown in FIG20, in the second liquid crystal display panel 200 of this embodiment, second main pixels 202 having an asymmetrical V-shape bent along the second scan wiring GL2 are arranged in a matrix along the X and Y directions. As shown in FIG21, one of the second main pixels 202 of the second liquid crystal display panel 200 corresponds to a plurality of sub-pixels 104 of the first liquid crystal display panel 100, and one of the first main pixels 202 of the second liquid crystal display panel 200 emits light to a plurality of sub-pixels 104 of the first liquid crystal display panel 100.

[0149] The second main pixel 202 has an asymmetrical V-shape. As shown in FIG21, the +Y and -Y sides of the shape (asymmetrical V-shape) of the second main pixel 202 are parallel to the second scan wiring GL2. Furthermore, as shown in FIG20, the +Y and -Y sides of the shape of the second main pixel 202 are located between adjacent second scan wirings GL2. As shown in FIG21, the +X and -X sides of the shape of the second main pixel 202 are curved along the shape of the sub-pixel 104 of the first liquid crystal display panel 100. Furthermore, the +X and -X sides of the shape of the second main pixel 202 overlap with the first signal wiring DL1 of the first liquid crystal display panel 100.

[0150] Similar to the second scan wiring GL2 in Embodiment 1, the second scan wiring GL2 in this embodiment passes through the interior of the second main pixel 202 and extends in a Z-shape along the X direction. Furthermore, the bending point P of the second scan wiring GL2 is located within the second main pixel 202 between the sub-pixels 104 of the first liquid crystal display panel 100.

[0151] Similar to the second scan wiring GL2 in Embodiment 1, the second scan wiring GL2 in this embodiment is arranged along the X direction with a period corresponding to a predetermined number N of sub-pixels 104 of the first liquid crystal display panel 100. The predetermined number N is greater than (three) the number of colors of the sub-pixels 104 arranged along the X direction in one of the first main pixels 102 of the first liquid crystal display panel 100, and is not a natural multiple of the number of colors of the sub-pixels 104 repeatedly arranged along the X direction of the first liquid crystal display panel 100. Furthermore, the predetermined number N satisfies the above equations (1) and (2). For example, when the predetermined number N is 16 (n=5, m=1), as shown in FIG22, the colors of the sub-pixels 104 whose incoming light is blocked by the bending point P change sequentially. Therefore, also in this embodiment, on the display area 101 of the first liquid crystal display panel 100, the reduction in color brightness of the sub-pixels 104 (color deviation caused by color mixing) is averaged out, and the color moiré of the liquid crystal display device 10 can be suppressed. Note that in Figure 22, a sub-pixel 104 of the first liquid crystal display panel 100 is shown as a rectangle.

[0152] When the liquid crystal display device 10 is viewed from the front, as shown in FIG21, the second signal wiring DL2 of this embodiment is located between the sub-pixels 104 of the first liquid crystal display panel 100 and extends along the Y direction, while bending along the outline of the sub-pixels 104 of the first liquid crystal display panel 100. In this embodiment, the second liquid crystal display panel 200 does not include the dummy line DM, and the second signal wiring DL2 is provided every four sub-pixels 104 of the first liquid crystal display panel 100 to form a first light-shielding pattern 260. Similarly, in this embodiment, the second signal wiring DL2 (first light-shielding pattern 260) is provided every four sub-pixels 104 of the first liquid crystal display panel 100. Therefore, as in Embodiment 1, the spatial frequency of the dark lines formed by the wiring with light-shielding characteristics and extending along the Y direction can be increased, and the dark lines can be made more difficult for the observer to identify.

[0153] In this embodiment, as shown in FIG23, one of the second main pixels 202 includes three switching elements 240 and three pixel electrodes 250. One of the second main pixels 202 is driven by a voltage from one of the second scan wirings GL2 and three of the second signal wirings DL2. Note that in FIG23, for ease of understanding, the switching elements 240 are shown as dashed lines and the pixel electrodes 250 are shown as solid lines.

[0154] The pixel electrode 250 includes a baseline electrode 254 and a linear electrode 256. The baseline electrode 254 is disposed on and extends along the second scan wiring GL2. The baseline electrode 254 is connected to the switching element 240 via a contact hole (not shown).

[0155] Linear electrode 256 branches from baseline electrode 254 and extends along the +Y or -Y direction. Similar to the second signal wiring DL2, linear electrode 256 bends along the outline of sub-pixel 104 of the first liquid crystal display panel 100.

[0156] The other configurations of the second liquid crystal display panel 200 in this embodiment are the same as those in Embodiment 1.

[0157] Therefore, the shape of the second main pixel 202 of the second liquid crystal display panel 200 is not limited to a rectangle. Similar to Embodiment 1, in this embodiment, color moiré patterns of the liquid crystal display device 10 can also be suppressed.

[0158] Modified example

[0159] Embodiments have been described, but various modifications may be made to this disclosure without departing from the spirit and scope thereof.

[0160] For example, in this embodiment, the first liquid crystal display panel 100 and the second liquid crystal display panel 200 are implemented as horizontal electric field type liquid crystal display panels. However, it is possible for the first liquid crystal display panel 100 and the second liquid crystal display panel 200 to be configured as vertical alignment (VA) mode, twisted nematic (TN) mode, etc. Furthermore, the display area 101 of the first liquid crystal display panel 100 is not limited to having a rectangular shape, and may have a non-rectangular shape.

[0161] In one 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, it is possible for the second liquid crystal display panel 200 to include a polarizing plate on the main surface 220b of the second opposing substrate 220.

[0162] In embodiments 1 to 6, 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. However, 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 can be set as needed.

[0163] In this embodiment, the bending point P of the second scan wiring GL2 is located between the sub-pixels 104 of the first liquid crystal display panel 100, but the bending point P of the second scan wiring GL2 does not need to be located between the sub-pixels 104.

[0164] 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 (four in the X direction and four in the Y direction), and the inclined portion 282 of the second light-shielding pattern 280 (second signal wiring DL2 and dummy line DM) spans two rows of sub-pixels 104 extending in the Y direction and passes through four sub-pixels 104 by an amount corresponding to one sub-pixel 104. However, for each second main pixel 202 of the second liquid crystal display panel 200, it is sufficient for the second light-shielding pattern 280 to be inclined relative to the Y direction across the two rows of sub-pixels 104 extending in the Y direction of the first liquid crystal display panel 100. For example, as shown in FIG24, a second main pixel 202 of the second liquid crystal display panel 200 corresponds to four first main pixels 102 of the first liquid crystal display panel 100 (two in the X direction and two in the Y direction), and the second light-shielding pattern 280 (tilted portion 282) spans two rows of sub-pixels 104 extending along the Y direction and passes through the four sub-pixels 104 at an angle corresponding to one sub-pixel 104.

[0165] For illustrative purposes, some exemplary embodiments have been described above. Although specific embodiments have been given in the preceding discussion, 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 invention. Therefore, the specification and drawings are to be considered illustrative rather than restrictive. Consequently, this detailed description should not be construed as limiting, and the scope of the invention is defined only by the appended claims together with the full scope of their equivalents.

Claims

1. A liquid crystal display device, comprising: A first liquid crystal display panel displays a color image, and in the first liquid crystal display panel, first main pixels are arranged in a matrix along a predetermined first direction and a predetermined second direction perpendicular to the predetermined first direction, the first main pixels comprising a plurality of sub-pixels of different colors; and a second liquid crystal display panel displays a monochrome image and is located on the side of the first liquid crystal display panel opposite to the observer's side surface to overlap with the first liquid crystal display panel, and in the second liquid crystal display panel, second main pixels are arranged in a matrix along the predetermined first direction and the predetermined second direction, wherein the second liquid crystal display panel includes scan lines, each scan line extending in a zigzag pattern along the predetermined first direction, the zigzag patterns of the scan lines having the same period, the scan lines being arranged in the predetermined second direction, wherein the zigzag pattern is parallelly shifted in the predetermined second direction, and the period of the bending points of the scan lines of the second liquid crystal display panel arranged along the predetermined first direction corresponds to the zigzag pattern of the first liquid crystal display panel. The first liquid crystal display panel includes a predetermined number of sub-pixels, and the predetermined number is greater than the number of colors of sub-pixels arranged along the predetermined first direction in one of the first main pixels of the first liquid crystal display panel, and is not a natural multiple of the number of colors of sub-pixels repeatedly arranged along the predetermined first direction of the first liquid crystal display panel. The first liquid crystal display panel includes a first signal wiring disposed between the sub-pixels and extending along a predetermined second direction. The second liquid crystal display panel includes a first light-shielding pattern extending along the predetermined second direction. The first light-shielding pattern is formed by a second signal wiring extending along the predetermined second direction, or by the second signal wiring extending along the predetermined second direction and a dummy line. When viewed from the front, the first light-shielding pattern is disposed every plurality of sub-pixels, the number of which is one greater than the number of colors of sub-pixels repeatedly arranged along the predetermined first direction of the first liquid crystal display panel. The first light-shielding pattern overlaps with the first signal wiring of the first liquid crystal display panel.

2. A liquid crystal display device, comprising: A first liquid crystal display panel displays a color image, and in the first liquid crystal display panel, first main pixels are arranged in a matrix along a predetermined first direction and a predetermined second direction perpendicular to the predetermined first direction, the first main pixels comprising a plurality of sub-pixels of different colors; and a second liquid crystal display panel displays a monochrome image and is located on the side of the first liquid crystal display panel opposite to the observer's side surface to overlap with the first liquid crystal display panel, and in the second liquid crystal display panel, second main pixels are arranged in a matrix along the predetermined first direction and the predetermined second direction, wherein the second liquid crystal display panel includes scan lines, each scan line extending in a zigzag pattern along the predetermined first direction, the zigzag patterns of the scan lines having the same period, the scan lines being arranged in the predetermined second direction, wherein the zigzag patterns are parallelly shifted in the predetermined second direction, the scan lines of the second liquid crystal display panel... The period of the bending points arranged along the predetermined first direction corresponds to a predetermined number of sub-pixels in the first liquid crystal display panel, and the predetermined number is greater than the number of colors of the sub-pixels arranged along the predetermined first direction in one of the first main pixels of the first liquid crystal display panel, and is not a natural multiple of the number of colors of the sub-pixels repeatedly arranged along the predetermined first direction in the first liquid crystal display panel. The second liquid crystal display panel includes a second light-shielding pattern extending along the predetermined second direction, and the second light-shielding pattern is formed by a second signal wiring extending along the predetermined second direction, or by a second signal wiring and a dummy line extending along the predetermined second direction. For each of the second main pixels, two rows of sub-pixels extending along the predetermined second direction and adjacent to each other along the predetermined first direction across the first liquid crystal display panel are tilted relative to the predetermined second direction.

3. The liquid crystal display device according to claim 1 or 2, wherein the bending point of the scan wiring of the second liquid crystal display panel is located in the second main pixel of the second liquid crystal display panel.

4. The liquid crystal display device according to claim 1 or 2, wherein the second main pixel of the second liquid crystal display panel has a shape that is bent along the scan wiring of the second liquid crystal display panel.

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