JP2009042390A - Liquid crystal display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display apparatus in which a high contrast ratio can be realized while restraining the occurrence of parasitic capacitance. <P>SOLUTION: The liquid crystal display apparatus 1 is characterized in that a plurality of pixels are arrayed in a matrix state and a polarizing plate 19, a TFT substrate 11, a pixel electrode, an alignment layer 13, a liquid crystal layer 14, another alignment layer 15, a counter electrode 15, a color filter layer, a counter substrate 18 and another polarizing plate 20 are arranged in this order from the side of a light source. Each of pixels has a chevron planar form having a side extending in the direction inclined against the absorption axes of the polarizing plates 19, 20. A data line 11a to be formed on the TFT substrate 11 has a data line-crooked part 11a-1 crooked along the chevron planar form of each pixel. A reflected light lowering part 11b for lowering the reflected light by the side face thereof is formed on the data line-crooked part 11a-1. When each pixel has the chevron planar form in order to keep a high aperture ratio, the leakage of light can be restrained since the data line 11a is arranged to be crooked along the chevron planar form of each pixel. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device in which a plurality of pixels are arranged.

  In recent years, for example, a liquid crystal display device employing a VA (Vertical Alignment) mode using a vertically aligned liquid crystal has been proposed as a display monitor for liquid crystal televisions, notebook computers, car navigation systems, and the like. Yes.

  In the VA mode liquid crystal display device, as shown in FIG. 11, the vertical alignment type liquid crystal layer 124 is sealed with the pixel electrode 122 and the counter electrode 123 between the driving substrate 120 and the counter substrate 121. Has been. A pair of polarizing plates (polarizers and analyzers) 125 and 126 are provided above and below the driving substrate 120 and the counter substrate 121 so that their transmission axes are orthogonal to each other. In such a configuration, by providing the protrusion 127 on the surface of each electrode 122, 123 facing the liquid crystal layer 124, the director (major axis direction) of the liquid crystal molecules is regulated, and the alignment of the liquid crystal layer can be controlled. . Thereby, one pixel can be divided and a plurality of regions having different alignment directions of liquid crystal molecules can be formed (multi-domain), and a wide viewing angle and a high contrast ratio can be realized.

As another means of alignment division, there is a method of applying an electric field in an oblique direction to liquid crystal molecules by alternately providing slits (cuts) in each of a pair of electrodes. At this time, for example, in a pixel having a rectangular planar shape, the pixel electrode disposed on the drive substrate side is divided into two sub-pixel electrodes, thereby obtaining a wider viewing angle. Furthermore, by providing the slit in the direction inclined with respect to the transmission axis of the polarizing plate, the aperture ratio is improved. There has also been proposed a liquid crystal display device in which the planar shape of a pixel itself is a “<” shape formed along a slit extending direction (see Patent Document 2).
Japanese Patent Laid-Open No. 11-242225 JP 2007-72466 A

  However, as described above, in the configuration in which the planar shape of the pixel is arranged obliquely with respect to the transmission axis or the absorption axis of the polarizing plate, for example, a “<” shape, the wiring such as the data line is linear. When arranged in the above, one wiring is arranged over a plurality of adjacent pixel regions, which causes a parasitic capacitance and the like. Therefore, in the pixel having such a configuration, it is necessary to bend the wiring in a zigzag shape along the “<” shape. An example is shown in FIG.

  As shown in FIG. 12, for example, in a configuration in which pixels 100R, 100G, and 100B that display light of R (Red), G (Green), or B (Blue), respectively, are arranged in a matrix. The data line 111a arranged to face each pixel has a configuration bent along the "<" shape of the pixel. However, when the data lines 111a are arranged in a zigzag manner in this way, light leakage occurs during black display at the inclined portion, that is, the portion that is neither parallel nor orthogonal to the transmission axis or absorption axis, and the contrast is lowered. was there.

  The present invention has been made in view of such problems, and an object thereof is to provide a liquid crystal display device capable of realizing high contrast while suppressing the generation of parasitic capacitance due to the arrangement shape of the metal wiring. There is.

  A liquid crystal display device according to the present invention includes a plurality of pixels arranged in a matrix as a whole, a liquid crystal layer for modulating light from a light source, a pair of substrates for sealing the liquid crystal layer, and incident on the liquid crystal layer And a pair of polarizing plates that respectively control the polarization components of the light to be emitted and the light emitted from the liquid crystal layer. In such a configuration, two opposing sides in the planar shape of each pixel extend in a direction inclined with respect to the transmission axis or absorption axis of the pair of polarizing plates. A metal layer is provided on one of the pair of substrates, and the metal layer extends in a direction inclined with respect to the transmission axis or absorption axis of the pair of polarizing plates in the in-plane direction of the one substrate. The existing slope is included. In the display opening area of each pixel, a reflected light reducing unit that reduces the amount of reflected light on the side surface of the inclined portion is provided.

  However, the display opening region means a region through which light actually passes in a state where the metal layer is not disposed in each pixel region. The direction inclined with respect to the transmission axis or absorption axis of the polarizing plate is a direction that is neither parallel nor orthogonal to the transmission axis or absorption axis of the polarizing plate in a plane.

  In the liquid crystal display device according to the present invention, when the metal layer includes the inclined portion as described above, at least two opposite sides of the pixel are inclined with respect to the transmission axis or absorption axis of the pair of polarizing plates. Even so, the metal layer is not disposed over a plurality of adjacent pixel regions, and the generation of parasitic capacitance is suppressed. Of the light from the light source, light incident on the side surface of the metal layer on one substrate is reflected on this side surface, then passes through the liquid crystal layer and enters the polarizing plate (analyzer side). At this time, the light component reflected by the side surface of the inclined portion has a polarization component that changes between incident and outgoing, and is transmitted through the polarizing plate without being absorbed by the absorption axis of the polarizing plate. Here, the amount of reflected light at the inclined portion is reduced by providing the reflected light reducing portion corresponding to the inclined portion in the display opening region. Therefore, the occurrence of light leakage during black display is suppressed.

  According to the liquid crystal display device of the present invention, the metal layer includes the inclined portion extending in the direction inclined with respect to the transmission axis or the absorption axis of the pair of polarizing plates. Is inclined with respect to the transmission axis or absorption axis of the pair of polarizing plates, the generation of parasitic capacitance is suppressed. In addition, since the reflected light reducing unit is provided in the display opening area corresponding to the inclined part, the amount of reflected light in the inclined part is reduced, and the occurrence of light leakage during black display is suppressed. Therefore, high contrast can be realized while suppressing the generation of parasitic capacitance due to the arrangement shape of the metal layer.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a schematic configuration of a liquid crystal display device 1 according to an embodiment of the present invention. The liquid crystal display device 1 is, for example, an active matrix display device that displays an image for each pixel based on a video signal transmitted from a data driver using a drive signal supplied from a gate driver (not shown).

  The liquid crystal display device 1 includes a plurality of pixels (dots) arranged in a matrix, for example, a pixel 10R that displays red (R), a pixel 10G that displays green (G), and blue (B: Blue). Has a pixel 10B. The liquid crystal display device 1 includes a pixel electrode 12R, 12G, 12B, an alignment film 13, a liquid crystal layer 14, and an alignment film formed for each pixel between a TFT (Thin Film Transistor) substrate 11 and a counter substrate 18. 15, the counter electrode 16 and the color filter layers 17R, 17G, and 17B formed for each pixel are stacked in this order. A black matrix layer BM is formed in the vicinity of the boundary between the adjacent color filter layers 17R, 17G, and 17B. A polarizing plate 19 and a polarizing plate 20 are disposed on the lower surface of the TFT substrate 11 and the upper surface of the counter substrate 18, respectively. Such a liquid crystal display device 1 is used as a display monitor for electronic devices such as a liquid crystal television and a notebook computer.

  The TFT substrate 11 and the counter substrate 18 are configured to include a transparent substrate such as glass. A glass substrate (described later) constituting the TFT substrate 11 is connected to a TFT switching element (not shown) having a gate, a source, a drain, and the like for driving the pixels 10R, 10G, and 10B, and to these TFT switching elements. Various wirings such as a gate line (not shown) and a data line (metal layer) 11a are formed. The configuration of the data line 11a will be described later.

  The pixel electrodes 12R, 12G, 12B and the counter electrode 16 are made of transparent electrodes such as ITO (indium tin oxide). These electrodes are provided with slits (notches), protrusions, and the like (not shown). As a result, an electric field is applied to the liquid crystal molecules in the liquid crystal layer 14 at an angle, and alignment division (multiple) is performed in each pixel. Domain) is made. The alignment division in each pixel will be described later.

  The liquid crystal layer 14 is made of a liquid crystal material such as a nematic liquid crystal, a smectic liquid crystal, or a cholesteric liquid crystal. For example, a director (major axis direction) of liquid crystal molecules in a state where no voltage is applied is perpendicular to the substrate surface. A VA (Vertical Alignment) liquid crystal is used. Such a liquid crystal layer 14 is in a black display mode (normally black) with no voltage applied. The alignment films 13 and 15 regulate the alignment state of the liquid crystal layer 14 when the liquid crystal layer 14 is sealed between the TFT substrate 11 and the counter substrate 18. In this embodiment, the alignment films 13 and 15 are vertically aligned. For example, a polyimide or other resin material.

  The color filter layers 17R, 17G, and 17B are formed in the opening region of the black matrix BM adjacent to the counter substrate 18. The color filter layers 17R, 17G, and 17B are, for example, pigment dispersion type color filters and the like, which effectively transmit red, green, and blue components, respectively, and effectively transmit light in other wavelength regions. It is designed to absorb.

The black matrix BM partitions the display area of the pixels 10R, 10G, and 10B, and prevents reflection of external light at the boundary between the areas of each color and prevents light leakage between the pixels, thereby increasing the contrast. . This black matrix BM is formed by laminating thin layers of metal, metal oxide and metal nitride, for example, a two-layer chrome black matrix composed of a laminate of CrO _x (x is an arbitrary number) and Cr, or reflectivity. It is composed of a three-layer chrome black matrix composed of laminated layers of reduced CrO _x , CrN _y and Cr (x and y are arbitrary numbers), or an acrylic resin mixed with carbon particles.

  The polarizing plates 19 and 20 transmit polarized light that vibrates in a specific direction, and absorb polarized light that vibrates in a direction orthogonal thereto. These polarizing plates 19 and 20 are arranged so that their transmission axes are orthogonal to each other. The polarizing plate 19 is a polarizer and the polarizing plate 20 is an analyzer. A light source (backlight) (not shown) is disposed below the polarizing plate 19, and the upper side of the polarizing plate 20 is the display side.

  As the light source, for example, an edge light type using a light guide plate or a direct type is used. For example, a CCFL (Cold Cathode Fluorescent Lamp) or an LED (Light Emitting Diode) is used. Light emitting diode). In addition to this, a reflection plate or the like may be provided in order to diffuse (recycle) the light returned from the light source or the polarizing plate 19 and use it again as display light.

  Next, with reference to FIGS. 2 to 4, the configuration of the wiring formed on the TFT substrate 11 and the alignment division in each pixel will be described. FIG. 2 shows a planar configuration of the data line 11a viewed from the color filter layer side for the pixels 10R, 10G, and 10B. FIG. 3 shows an example of alignment division in each pixel of the liquid crystal display device 1. FIG. 4 shows a cross-sectional configuration of the data line bent portion 11a-1 and the reflected light reducing portion 11b in FIG. Note that the liquid crystal display device 1 has a configuration in which a plurality of pixels are arranged in a matrix, but for simplification, three of R, G, and B arranged in a direction orthogonal to the extending direction of the data line 11a. Only one pixel (dot) is shown. In the present embodiment, the polarizing plate 19 is disposed such that the absorption axis An is in the vertical direction and the polarizing axis 20 is in the horizontal direction.

  As shown in FIG. 2, the pixels 10 </ b> R, 10 </ b> G, and 10 </ b> B have a “<”-shaped planar shape and are inclined with respect to the absorption axis An of the polarizing plate 19 or the absorption axis Po of the polarizing plate 20. It has a hypotenuse that extends in the direction of. Each hypotenuse in the “<” shape has an angle of about 45 ° with respect to the absorption axis An or the absorption axis Po, for example. Corresponding to the "<" shape, each of the pixel electrodes 12R, 12G, 12B and the counter electrode 16 is provided with orientation control means such as a plurality of slits and protrusions (not shown). As a result, a plurality of regions (multi-domains) having different alignment directions (director directions) of liquid crystal molecules can be formed in one pixel. The direction inclined with respect to the absorption axis refers to a direction that is neither parallel nor orthogonal to the absorption axis.

  For example, as shown in FIG. 3A, each of the pixels 10R, 10G, and 10B is divided into four regions a, b, c, and d having different alignment directions of liquid crystal molecules. At this time, in the regions a, b, c, and d, as shown in FIG. 3B, the director of the liquid crystal molecules is controlled in the direction inclined with respect to the absorption axis An or the absorption axis Po of the polarizing plates 19 and 20. Is done. In particular, the hypotenuse of each pixel forms approximately 45 ° with respect to the absorption axis An or the absorption axis Po, and the directors of the liquid crystal molecules in the regions a, b, c, and d are respectively relative to the absorption axis An or the absorption axis Po. The angle is approximately 45 °. Note that these areas a, b, c, and d correspond to a plurality of areas in the present invention.

  The data lines 11a arranged for each of the pixels 10R, 10G, and 10B having such a planar shape are arranged without passing through adjacent pixel areas at least in the display opening area. That is, the data line 11a has a data line bent portion 11a-1 at least at a part thereof, and is not linear but bent along a “<” shape. Note that the display opening region is a region through which light actually passes in a state where a metal wiring layer such as the data line 11a is not disposed. Further, the data line bent portion 11a-1 corresponds to an example of the inclined portion of the present invention.

  In a region corresponding to the data line bent portion 11a-1, a reflected light reducing portion 11b is formed. As shown in FIG. 4, the reflected light reducing unit 11 b is formed between the glass substrate 110 constituting the TFT substrate 11 and the data line bent part 11 a-1, with a width of the bottom surface that is larger than that of the data line bent part 11 a-1. It is formed so that (flat area) becomes large. The reflected light reducing unit 11b is made of a material having low light transmittance, such as amorphous silicon (α-Si), silicon nitride (SiN), etc., and has a thickness of, for example, 50 nm. Thereby, the light quantity of the polarized light incident on the side surface of the data line bent portion 11a-1 can be reduced.

  Moreover, such a liquid crystal display device 1 can be manufactured as follows, for example.

  First, a TFT switching element including a gate, a source, a drain, and the like for driving the pixel electrodes 12R, 12G, and 12B and the pixels 10R, 10G, and 10B in a matrix on the surface of the glass substrate 110, and a plurality of these TFT switching elements. Gate lines (not shown) connected to the elements are formed. Further, the data line 11a and the reflected light reducing portion 11b bent along the planar shape of the pixel are formed. At this time, by using an amorphous silicon film as the reflected light reducing portion 11b, a pattern can be easily formed with the same material as the TFT switching element. Thereby, the TFT substrate 11 is formed. On the other hand, after patterning, for example, R, G, B color filter layers 17R, 17G, 17B and a black matrix BM on the surface of the counter substrate 18, the counter electrode 16 is formed. In addition, slits are formed in the pixel electrodes 12R, 12G, and 12B and the counter electrode 16 at a predetermined interval along the hypotenuse. Subsequently, alignment films 13 and 15 are formed on the surfaces of the formed pixel electrodes 12R, 12G, and 12B and the counter electrode 16, for example, by applying a vertical alignment agent or printing and baking a vertical alignment film. .

  Next, a spacer for ensuring a cell gap, such as plastic beads, is sprayed on the surface of either the TFT substrate 11 or the counter substrate 18 (the surface on which the alignment films 13 and 15 are formed). For example, the seal portion is printed using an epoxy adhesive or the like by a screen printing method. After that, the TFT substrate 11 and the counter substrate 18 are bonded to each other through spacers and seal portions so that the alignment films 13 and 15 formed on the respective substrates face each other, and the liquid crystal layer 14 is injected. Thereafter, the liquid crystal layer 14 is sealed between the TFT substrate 11 and the counter substrate 18 by curing the seal portion by heating or the like.

  Finally, the polarizing plate 19 and the polarizing plate 20 are bonded to the lower surface of the TFT substrate 11 and the upper surface of the counter substrate 18, respectively, thereby completing the liquid crystal display device 1 shown in FIG.

  Next, the operation and effect of the liquid crystal display device 1 having the above configuration will be described.

  In the liquid crystal display device 1, when light emitted from a light source (not shown) enters the polarizing plate 19, only a specific polarization component is transmitted and enters the liquid crystal layer 14 side. In the liquid crystal layer 14, light is modulated by a voltage applied between the pixel electrodes 12R, 12G, 12B and the counter electrode 16 based on the image data. The light transmitted through the liquid crystal layer 14 is extracted as red, green, and blue light by the color filter layers 17R, 17G, and 17B for each of the pixels 10R, 10G, and 10B. Only the light is transmitted or absorbed and displayed.

  At this time, the planar shape of the pixels 10R, 10G, and 10B is a “<” shape, that is, has an oblique side extending in a direction inclined with respect to the absorption axis An or the absorption axis Po of the polarizing plates 19 and 20. Therefore, the director of the liquid crystal molecules of the liquid crystal layer 14 can be easily controlled uniformly in the direction inclined with respect to the absorption axis An or the absorption axis Po of the polarizing plates 19 and 20, and the aperture ratio (transmittance). Will improve. In particular, as shown in FIG. 3B, the aperture ratio is effectively improved by controlling the director of the liquid crystal molecules so as to form an angle of 45 ° with respect to the absorption axis An or the absorption axis Po. be able to. In this way, a high aperture ratio (high transmittance) can be realized by forming the planar shape of each pixel so as to have a “<” shape.

  Here, as a conventional example, FIG. 5 shows a planar configuration in the case where the data line 110a is linearly arranged with respect to the “<” shape pixel. In this manner, when the data line 110a is formed linearly without being bent along the shape of the pixel, the data line 110a is arranged over a plurality of adjacent pixels. For this reason, parasitic capacitance occurs between adjacent pixels.

  On the other hand, in the present embodiment, the data line 11a arranged for the pixels 10R, 10G, and 10B having the “<”-shaped planar shape is bent along the shape of each pixel. By having 11a-1, the data line 11a is arranged without facing the adjacent pixel region in the direction orthogonal to the extending direction. Therefore, in order to increase the aperture ratio, the generation of parasitic capacitance is suppressed even when the planar shape of the pixel is a “<” shape.

  On the other hand, as shown in FIG. 6, out of the polarized light transmitted through the polarizing plate 19, polarized light incident at a predetermined angle on the side surface of the data line 11a formed on the TFT substrate 11 is reflected on the side surface of the data line 11a. After that, the light enters the liquid crystal layer 14 side. At this time, in a state where no voltage is applied, that is, in a black display state, the polarized light reflected by the side surface of the data line 11a formed extending in a direction parallel or orthogonal to the absorption axis An or the absorption axis Po. Is absorbed by the polarizing plate 20 after passing through the liquid crystal layer 14.

  However, the polarized light reflected by the side surface of the data line bent portion 11a-1 formed extending in the direction inclined with respect to the absorption axis An or the absorption axis Po, that is, the direction that is neither parallel nor orthogonal, is polarized by the reflection. Changes and is transmitted without being absorbed by the polarizing plate 20. Therefore, in the case where the data line 11a is bent along the "<" shape of the pixel so that no parasitic capacitance is generated between adjacent pixels, Light leakage occurs during black display. At this time, the contrast is as low as about 1: 100, for example.

  Therefore, in the present embodiment, by providing the reflected light reducing portion 11b made of a material having low light transmittance between the data line bent portion 11a-1 and the glass substrate 110 constituting the TFT substrate 11, the data is reduced. Since the amount of light incident on the side surface of the line bending portion 11a-1 is reduced, the amount of reflected light on the side surface is reduced. Therefore, the amount of light that is transmitted without being absorbed by the polarizing plate 20 during black display is suppressed, and the contrast is, for example, about 1: 1550, which is improved as compared with the conventional case.

  As described above, in this embodiment, since the planar shape of each pixel is formed in a “<” shape, the aperture ratio is improved. In addition, since the data line bent portion 11a-1 is provided along the shape of the "<" shape, the generation of parasitic capacitance can be suppressed. At this time, if the data line 11a is provided in a direction inclined with respect to the absorption axis An or the absorption axis Po, the polarization component of the reflected light on the side surface changes depending on whether it is incident or emitted, and the polarizing plate 20 Permeated without being absorbed by In the present embodiment, since the reflected light reducing portion 11b is provided between the data line bent portion 11a-1 and the glass substrate 110, the amount of reflected light on the side surface of the data line bent portion 11a-1 is reduced, Occurrence of light leakage during black display is suppressed. Therefore, high contrast can be realized while suppressing generation of parasitic capacitance due to the arrangement shape of the data lines.

  Next, a modified example of the present invention will be described. Note that, in the following modified example, the same reference numerals are given to the same configurations as those of the liquid crystal display device 1 according to the above-described embodiment, and description thereof will be appropriately omitted.

(Modification 1)
FIG. 7 is a plan view illustrating a schematic configuration of the pixels 20R, 20G, and 20B viewed from the color filter layer side of the liquid crystal display device according to the first modification of the present invention. In Modification 1, only the pixel 30G that displays green light is the same as the liquid crystal display device 1 of the above-described embodiment except that the reflected light reduction unit 11b is provided in the data line bending portion 11a-1. It has a configuration. As described above, the reflected light reducing unit 11b is not necessarily provided for the three pixels R, G, and B, and may be configured only for the G pixel. Since the visibility of G is the highest among R, G, and B, if the reflected light reducing unit 11b is provided for at least the G pixel, it is almost the same as when the reflected light reducing unit 11b is provided for all the pixels. An effect of (contrast 1: about 1400) can be obtained.

(Modification 2)
FIG. 8 is a plan view illustrating a schematic configuration of the pixels 30R, 30G, and 30B of the liquid crystal display device according to the second modification of the present invention. In the second modification, the data line 21a is bent into a “<” shape over the entire display opening area of each pixel. For this reason, the reflected light reduction unit 21b is provided over the entire surface of the region facing the data line 21a arranged in the display opening region of the pixel. However, the reflected light reduction part 21b is comprised with the material similar to the above-mentioned reflected light reduction part 11b. Thus, the shape of the data line is not particularly limited as long as it can be arranged so as not to face the adjacent pixel region. That is, the effect of the present invention can be obtained by providing the reflected light reducing portion in a region facing a portion extending in a direction inclined with respect to the absorption axis An or the absorption axis Po of the data line.

  Also in the present modification, the reflected light reduction unit 21b may be provided only in the G pixel among the three pixels R, G, and B as in Modification 1.

(Modification 3)
FIG. 9 is a plan view illustrating a schematic configuration of the pixels 40R, 40G, and 40B of the liquid crystal display device according to the third modification of the present invention. FIG. 10 is a cross-sectional view illustrating a schematic configuration of the data line bent portion 11a-1. Modification 3 has the same configuration as that of the liquid crystal display device 1 except that the reflected light reduction unit 31b is formed so as to cover the data line bending portion 11a-1. However, the reflected light reducing unit 31b is made of the same material as the above-described reflected light reducing unit 11b.

  As shown in FIGS. 9 and 10, the reflected light reducing unit 31 b has an upper surface of the data line bent portion 11 a-1 and a width (plane area) of the bottom surface of the data line bent portion 11 a-1. It is formed so as to cover the side surface (slope). Thus, the place where the reflected light reduction part 31b is formed is not limited between the data line and the glass substrate as in the liquid crystal display device 1, but is reflected by the light incident on the side surface of the data line 11a or the side surface. Thus, the effect of the present invention is achieved as long as the amount of emitted light can be reduced.

  Also in the present modification, the reflected light reduction unit 31b may be provided only in the G pixel among the three pixels R, G, and B as in Modification 1. Moreover, you may make it provide a reflected light reduction part so that only the side surface of the data line bending part 11a-1 may be covered.

  While the present invention has been described with reference to the embodiment, the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above-described embodiment, the data line bent portion is described as an example of the inclined portion of the metal layer. However, the configuration of the inclined portion is not limited to this, for example, the transmission axis or the absorption axis of the polarizing plate. The configuration may be such that it extends linearly only in one direction inclined with respect to it, and does not have to be particularly bent. Or you may have a some inclination part in a pixel.

  In the above embodiment, the data line is described as an example of the metal layer disposed on the TFT substrate. However, the present invention is not limited to this, and other metal layers such as an auxiliary capacitance line, a gate line, etc. It can be applied to those that may reflect light from the light source on the side.

  In the above embodiment, the configuration using the vertical alignment type VA liquid crystal as the liquid crystal layer has been described as an example. However, the present invention is not limited to this, and other modes such as a TN (Twisted Nematic) mode, IPS ( In-plane switching) mode liquid crystal is also applicable.

  In the above embodiment, the description has been given by taking as an example the configuration of a full-color liquid crystal display device in which three color filter layers of R, G, and B are provided and each pixel is assigned to each color filter layer. However, the present invention is not limited to this, and the present invention can be applied to a configuration in which a color filter layer is not provided, for example, a monochrome display liquid crystal display device. Moreover, although the structure which provided the reflected light reduction part in all of R, G, B, or only G was mentioned as an example, it was not limited to this, R and G only, G and B only, R and B only Even if it is the structure which provided the reflected light reduction part only in R and only B, the effect of this invention is achieved.

  In the above-described embodiment, the shape of the “<” shape is described as an example of the planar shape of the pixel. However, the shape is not limited to this, and the pixel is inclined with respect to the transmission axis or the absorption axis of the polarizing plate. It may be a shape having sides extending in the direction, for example, a parallelogram, a rhombus, or a shape in which “<” is connected in the vertical direction (W shape, M shape, zigzag shape). Further, the present invention is also applicable to a case where a rectangular pixel is divided into a plurality of sub-pixels, and the planar shape of these sub-pixels is a shape such as “<”.

  In the above embodiment, each pixel is aligned and divided, and the configuration in which four regions having different alignment directions of liquid crystal molecules are formed is described as an example. However, the number of alignment divisions is not limited to this, The effect of the present invention can be achieved even when the number is three or less or five or more.

  In the above embodiment, the polarizing plates 19 and 20 are arranged so that the absorption axis An of the polarizing plate 19 on the light source side is in the vertical direction and the absorption axis Po of the polarizing plate 20 on the display side is in the horizontal direction. Although described as an example, the optical axis direction of the polarizing plate is not limited to this, and the absorption axis An may be arranged in the horizontal direction and the absorption axis Po may be arranged in the vertical direction.

1 is a cross-sectional view illustrating a schematic configuration of a liquid crystal display device according to a first embodiment of the present invention. FIG. 2 is a plan view illustrating a schematic configuration of a pixel of the liquid crystal display device illustrated in FIG. 1. (A) is a top view showing an example of the orientation division | segmentation of the pixel shown in FIG. 2, (B) is a schematic diagram showing the director of a liquid crystal molecule. FIG. 3 is a cross-sectional view illustrating a schematic configuration of a data line and a reflected light reducing unit of the pixel illustrated in FIG. 2. It is a top view showing the arrangement configuration of the conventional data line. It is a figure showing a mode that light reflects in the side of a data line. 10 is a plan view illustrating a schematic configuration of a pixel of a liquid crystal display device according to Modification 1. FIG. 12 is a plan view illustrating a schematic configuration of a pixel of a liquid crystal display device according to Modification 2. FIG. 10 is a plan view illustrating a schematic configuration of a pixel of a liquid crystal display device according to Modification 3. FIG. It is sectional drawing showing schematic structure of the data line of a pixel shown in FIG. 8, and a reflected light reduction part. It is sectional drawing showing schematic structure of the conventional liquid crystal display device of a vertical alignment type. It is a top view showing the wiring structure with respect to a square-shaped pixel.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display device 10R, 10G, 10B, 20R, 20G, 20B, 30R, 30G, 30B, 40R, 40G, 40B ... Pixel, 11 ... TFT substrate, 11a, 21a ... Data line, 11b, 21b, 31b ... Reflected light reducing portions 12R, 12G, 12B ... Pixel electrodes, 13, 15 ... Alignment film, 14 ... Liquid crystal layer, 16 ... Counter electrode, 17R, 17G, 17B ... Color filter layer, 18 ... Counter substrate, 19, 20 ... Polarized light Board.

Claims (14)

A plurality of pixels are arranged in a matrix as a whole, a liquid crystal layer for modulating light from a light source, a pair of substrates for sealing the liquid crystal layer, incident light on the liquid crystal layer, and the liquid crystal layer A liquid crystal display device comprising a pair of polarizing plates that transmit only a specific polarization component of light emitted from
Two opposite sides in the planar shape of each pixel extend in a direction inclined with respect to the transmission axis or absorption axis of the pair of polarizing plates,
A metal layer on one of the pair of substrates;
The metal layer includes an inclined portion extending in a direction inclined with respect to a transmission axis or an absorption axis of a pair of polarizing plates in an in-plane direction of the one substrate,
A liquid crystal display device, wherein a reflected light reducing unit is provided in a display opening region of each pixel to reduce the amount of reflected light on the side surface of the inclined portion. A color filter that transmits light of R (Red), G (Green) or B (Blue) color is provided on the other substrate of the pair of substrates for each pixel,
The liquid crystal display device according to claim 1, wherein the inclined portion is provided in at least one of the pixels corresponding to the R, G, and B. The liquid crystal display device according to claim 2, wherein the inclined portion is provided in at least a pixel corresponding to G among pixels corresponding to R, G, and B. 4. The liquid crystal display device according to claim 2, wherein the inclined portion is provided in all of the pixels corresponding to the R, G, and B. The liquid crystal display device according to claim 1, wherein the metal layer is a data line for transmitting an image signal to each pixel. The liquid crystal display device according to claim 1, wherein the metal layer is an auxiliary capacitance line for forming an auxiliary capacitance in each pixel. The liquid crystal display device according to claim 1, wherein the reflected light reduction unit is provided between the one substrate and the inclined part with a larger plane area than the inclined part. The liquid crystal display device according to claim 1, wherein the reflected light reduction unit is provided so as to cover at least a side surface of the inclined portion. The liquid crystal display device according to claim 1, wherein the reflected light reduction unit is made of amorphous silicon (α-Si). The liquid crystal display device according to claim 1, wherein the reflected light reduction unit is made of silicon nitride (SiN). The liquid crystal display device according to claim 1, wherein each pixel has a plurality of regions in which alignment directions of liquid crystal molecules in the liquid crystal layer are different from each other. The liquid crystal display device according to claim 11, wherein the alignment direction of liquid crystal molecules in a plurality of regions of each pixel forms an angle of 45 ° with respect to a transmission axis or an absorption axis of the polarizing plate. The liquid crystal display device according to claim 11, wherein two opposing sides in the planar shape of each pixel form an angle of 45 ° with respect to the transmission axis or absorption axis of the pair of polarizing plates. The liquid crystal display device according to claim 11, wherein each pixel has a square-shaped planar shape.

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