WO2012011403A1 - Liquid crystal display device - Google Patents

Abstract

This liquid crystal display device comprises a first substrate having a pixel electrode formed therein, a second substrate having, formed therein, a data bus line that faces the pixel electrode, and a liquid crystal arranged between the pixel electrode and the data bus line, and is characterized in that multiple domains having different liquid crystal alignment directions can be formed in an area in which one pixel electrode is arranged when a voltage is applied between the pixel electrode and the data bus line, the data bus line comprises a laminate of a transparent first conductive layer and a second conductive layer having higher electrical conductivity and lower transmissivity than those of the first conductive layer, and the second conductive layer is formed at a position that overlaps the boundary between the domains.

Description

Liquid crystal display

The present invention relates to a liquid crystal display device.
This application claims priority on July 23, 2010 based on Japanese Patent Application No. 2010-166055 filed in Japan, the contents of which are incorporated herein by reference.

A liquid crystal display device described in Patent Document 1 is known as an active matrix type liquid crystal display device driven by a counter drive system. In the liquid crystal display device of Patent Document 1, a gate bus line and a reference bus line connected to a thin film transistor are formed on a first substrate on which a pixel electrode and a thin film transistor are formed, and on a second substrate facing the first substrate. A transparent conductive layer also used as a data bus line is formed. In the counter drive type liquid crystal display device, the gate bus line and the data bus line are formed on different substrates, and therefore, it is said that the manufacturing yield and the aperture ratio can be improved.

Japanese Patent Laid-Open No. 7-20495

In the counter drive type liquid crystal display device, the data bus line is formed on the second substrate side. However, if the data bus line is formed only by the transparent conductive layer, the electric resistance increases and a problem of signal delay occurs. Therefore, in Patent Document 1, in order to lower the electrical resistance of the data bus line, the data bus line is connected to the plurality of transparent first conductive layers provided independently for each pixel electrode and the first conductive layers. The low-resistance second conductive layer is formed.

However, since the second conductive layer is usually formed of a metal material, it is opaque to visible light. For this reason, all data bus line portions formed of the second conductive layer serve as light shielding regions, and the aperture ratio decreases. In Patent Document 1, the second conductive layer is formed along the edge of the pixel electrode. However, a region partially overlapping with the pixel electrode is generated, and a decrease in the aperture ratio is inevitable.

On the other hand, as a technique for expanding the viewing angle of a liquid crystal display device, an alignment division structure (multi-domain structure) that divides the alignment direction of the liquid crystal into a plurality of areas within one pixel electrode arrangement region has been developed. In a liquid crystal display device having an alignment division structure, a plurality of regions (domains) having different alignment directions of liquid crystals are formed in one pixel electrode arrangement region, so that a wide viewing angle display is possible.

The liquid crystal display device of Patent Document 1 is an STN or TN liquid crystal display device. The liquid crystal display device of Patent Document 1 does not have an alignment division structure, and a single domain is formed in an arrangement region of one pixel electrode. Although the alignment division structure can be applied to the liquid crystal display device of Patent Document 1, the liquid crystal display device provided with the alignment division structure has an alignment defect at the boundary between domains. Therefore, when the alignment division structure is applied to the liquid crystal display device of Patent Document 1, in addition to the decrease in aperture ratio due to the second conductive layer, the aperture ratio decreases due to alignment defects, resulting in dark display.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a liquid crystal display device capable of displaying a bright and wide viewing angle.

A liquid crystal display according to an embodiment of the present invention includes a first substrate on which a pixel electrode is formed, a second substrate on which a data bus line facing the pixel electrode is formed, the pixel electrode, and the data bus line. A liquid crystal disposed between the pixel electrode and the data bus line, the orientation direction of the liquid crystal is within one pixel electrode placement region when a voltage is applied between the pixel electrode and the data bus line. A plurality of different domains are formed, and the data bus line is formed by laminating a transparent first conductive layer and a second conductive layer having higher conductivity and lower transmittance than the first conductive layer, The two conductive layers are formed at positions overlapping the boundary portions of the domains.

The liquid crystal is a liquid crystal having negative dielectric anisotropy, and the liquid crystal is vertically aligned on the liquid crystal side surface of the first substrate without applying a voltage between the pixel electrode and the liquid crystal. A first alignment film is formed, and a second alignment film that vertically aligns the liquid crystal without applying a voltage between the liquid crystal and the data bus line is formed on the liquid crystal side surface of the second substrate. May be.

A first polarizing plate is provided on one side of the first substrate, a second polarizing plate is provided on one side of the second substrate, and the transmission axis of the first polarizing plate and the transmission of the second polarizing plate. The axes are orthogonal to each other, and the first alignment film tilts the liquid crystal in a first direction parallel to or orthogonal to the transmission axis of the first polarizing plate in one pixel electrode arrangement region 2. Two first alignment regions are provided, and the two first alignment regions are provided so as to divide the pixel electrode arrangement region into two with a straight line parallel to the first direction interposed therebetween, and the two first alignment regions The tilt direction of the liquid crystal in the region is opposite to each other across a straight line parallel to the normal line of the first substrate, and the second alignment film includes the first electrode in the region where the pixel electrode is disposed. Two second alignment regions that tilt the liquid crystal in a second direction orthogonal to one direction The two second alignment regions are provided so as to divide the pixel electrode arrangement region into two across a straight line parallel to the second direction, and the liquid crystal tilts in the two second alignment regions. The directions are opposite to each other across a straight line parallel to the normal line of the second substrate, and the four first regions and the two second alignment regions are overlapped to form four regions. Four of the domains may be formed.

The two first alignment regions and the two second alignment regions may be formed by performing a photo-alignment process on the first alignment film and the second alignment film.

The plurality of domains may be arranged on at least one of the first substrate and the second substrate, and may be formed of an alignment regulating structure that regulates the alignment direction of the liquid crystal when a voltage is applied.

In the plurality of domains, a liquid crystal composition in which a monomer is mixed with the liquid crystal is sealed between substrates, and a voltage is applied between the substrates to cause the liquid crystal molecules to be tilted to polymerize and polymerize the monomers. It may be formed by the orientation maintaining layer.

A plurality of the pixel electrodes are arranged in the first direction and the second direction on the first substrate, and the data bus line extending in the second direction is formed on the second substrate. A plurality may be formed in one direction.

The second conductive layer may be formed linearly in the second direction across the plurality of pixel electrodes arranged in the second direction.

The second conductive layer includes a first straight line that overlaps a boundary between the two first alignment regions or a second straight line that overlaps a boundary between the two second alignment regions in one pixel electrode arrangement region. And the second conductive layers formed in the adjacent pixel electrode arrangement region are connected to each other via a third straight line portion overlapping an occurrence region of an alignment defect generated at an edge of the pixel electrode. It may be connected.

The second conductive layer includes a first straight line portion that overlaps a boundary portion between the two first alignment regions and a second straight line portion that overlaps a boundary portion between the two second alignment regions in one pixel electrode arrangement region. And a straight portion.

The second conductive layer may have a third straight portion that overlaps with a region where an alignment defect is generated at the edge of the pixel electrode.

A black light absorption layer may be provided between the second conductive layer and the liquid crystal.

A black light absorption layer may be provided on the side opposite to the liquid crystal with the second conductive layer interposed therebetween.

According to the present invention, it is possible to provide a liquid crystal display device capable of displaying bright and wide viewing angles.

It is a top view of the image display area of the liquid crystal display device of a 1st embodiment. It is an equivalent circuit diagram of a plurality of display elements constituting an image display area. It is a schematic plan view which expands and shows 1 display element. FIG. 4 is a cross-sectional view taken along line AA in FIG. 3. It is a schematic diagram which shows the orientation state of the liquid crystal in 1 domain when a voltage is not applied between a pixel electrode and a data bus line. It is a schematic diagram which shows the orientation state of the liquid crystal in 1 domain when a voltage is applied between a pixel electrode and a data bus line. It is a figure which shows the alignment process direction of an alignment film, the transmission axis of a polarizing plate, and arrangement | positioning of a 2nd conductive layer. It is the schematic diagram which looked at the orientation state of the liquid crystal from the 2nd substrate side, Comprising: It is a schematic diagram which shows the orientation state of the liquid crystal of the 1st orientation film vicinity. It is the schematic diagram which looked at the alignment state of the liquid crystal from the 2nd board | substrate side, Comprising: It is a schematic diagram which shows the alignment state of the liquid crystal of the 2nd alignment film vicinity. It is the schematic diagram which looked at the orientation state of the liquid crystal from the 2nd board | substrate side, Comprising: It is a schematic diagram which shows the orientation state of the liquid crystal of the layer thickness direction center part of a liquid-crystal layer. It is a schematic diagram which shows the luminance distribution in 1 display element in an ON state. It is a schematic diagram which shows arrangement | positioning with a dark line and a 2nd conductive layer. It is a schematic plan view which expands and shows 1 display element of the liquid crystal display device of 2nd Embodiment. It is a schematic diagram which shows arrangement | positioning with a dark line and a 2nd conductive layer. It is a figure which shows the arrangement | positioning process of the orientation film of the liquid crystal display device of 3rd Embodiment, the transmission axis of a polarizing plate, and arrangement | positioning of a 2nd conductive layer. It is a schematic plan view which expands and shows 1 display element of the liquid crystal display device of 4th Embodiment. It is a schematic diagram which shows the 1st form of the luminance distribution in 1 display element in an ON state. It is a schematic diagram which shows the 2nd form of the luminance distribution in 1 display element in an ON state. It is a schematic diagram which shows arrangement | positioning with a dark line and a 2nd conductive layer. It is a schematic plan view which expands and shows 1 display element of the liquid crystal display device of 5th Embodiment. It is a schematic diagram which shows arrangement | positioning with a dark line and a 2nd conductive layer. It is a figure which shows the orientation processing direction of the orientation film of the liquid crystal display device of 6th Embodiment, the transmission axis of a polarizing plate, and arrangement | positioning of a 2nd conductive layer. It is a figure which shows arrangement | positioning of the orientation processing direction of the orientation film of the liquid crystal display device of 7th Embodiment, the transmission axis of a polarizing plate, and a 2nd conductive layer. It is a figure which shows the alignment processing direction of the alignment film of the liquid crystal display device of 8th Embodiment, the transmission axis of a polarizing plate, and arrangement | positioning of a 2nd conductive layer. It is the schematic diagram which looked at the alignment state of the liquid crystal in 9th Embodiment from the 2nd board | substrate side, Comprising: It is the schematic diagram which shows the alignment state of the liquid crystal of the 1st alignment film vicinity. It is the schematic diagram which looked at the alignment state of the liquid crystal in 9th Embodiment from the 2nd board | substrate side, Comprising: It is the schematic diagram which shows the alignment state of the liquid crystal of the 2nd alignment film vicinity. It is the schematic diagram which looked at the orientation state of the liquid crystal in 9th Embodiment from the 2nd board | substrate side, Comprising: It is the schematic diagram which shows the orientation state of the liquid crystal of the layer thickness direction center part of a liquid-crystal layer. It is the schematic diagram which looked at the alignment state of the liquid crystal in 10th Embodiment from the 2nd board | substrate side, Comprising: It is a schematic diagram which shows the alignment state of the liquid crystal of the 1st alignment film vicinity. It is the schematic diagram which looked at the alignment state of the liquid crystal in 10th Embodiment from the 2nd board | substrate side, Comprising: It is a schematic diagram which shows the alignment state of the liquid crystal of the 2nd alignment film vicinity. It is the schematic diagram which looked at the orientation state of the liquid crystal in 10th Embodiment from the 2nd board | substrate side, Comprising: It is a schematic diagram which shows the orientation state of the liquid crystal of the layer thickness direction center part of a liquid-crystal layer. It is the schematic diagram which looked at the alignment state of the liquid crystal in 11th Embodiment from the 2nd board | substrate side, Comprising: It is a schematic diagram which shows the alignment state of the liquid crystal of the 1st alignment film vicinity. It is the schematic diagram which looked at the alignment state of the liquid crystal in 11th Embodiment from the 2nd board | substrate side, Comprising: It is a schematic diagram which shows the alignment state of the liquid crystal of the 3rd alignment film vicinity. It is the schematic diagram which looked at the orientation state of the liquid crystal in 11th Embodiment from the 2nd board | substrate side, Comprising: It is a schematic diagram which shows the orientation state of the liquid crystal of the layer thickness direction center part of a liquid-crystal layer. It is a schematic diagram which shows the orientation control structure of the liquid crystal in 12th Embodiment, and the orientation state of a liquid crystal. It is a schematic diagram which shows the orientation control structure of the liquid crystal in 13th Embodiment, and the orientation state of a liquid crystal.

(First embodiment)
FIG. 1 is a plan view of an image display region of a liquid crystal display device 1 which is a first embodiment of an active matrix type liquid crystal display device driven by a counter driving method. The liquid crystal display device 1 displays an image related to an image signal in an image display area.

In the image display area of the liquid crystal display device 1, a plurality of pixel electrodes 11 having a substantially rectangular shape in a plan view are arranged in the X direction and the Y direction. A gate bus line 12 and a reference bus line 13 are connected to each pixel electrode 11 via a TFT (thin film transistor) 14. The gate bus line 12 and the reference bus line 13 extend linearly in the X direction along the gap between the pixel electrodes 11 adjacent in the Y direction.

A data bus line 22 is formed facing the pixel electrode 11. A strip shown by a dotted line 22 indicates a data bus line (transparent first conductive layer) on the second substrate superimposed on the pixel electrode 11 on the first substrate. The data bus line 22 extends linearly in the Y direction so as to straddle the plurality of pixel electrodes 11 arranged in the Y direction. A plurality of data bus lines 22 are formed in the X direction according to the arrangement of the pixel electrodes 11. A region where the pixel electrode 11 and the data bus line 22 face each other is one display element, and display is possible for each display element arranged in a matrix.

FIG. 2 is an equivalent circuit diagram of a plurality of display elements P constituting the image display area of the liquid crystal display device 1. In FIG. 2, for the sake of simplicity, an equivalent circuit for four display elements is shown.

The pixel electrodes 11 and the TFTs 14 are formed on the plurality of display elements P, respectively. A gate bus line 12 is connected to the gate 12 a of the TFT 14. A reference bus line 13 is connected to the source 16 of the TFT 14. The pixel electrode 11 is connected to the drain 17 of the TFT 14.

The gate voltages G1 and G2 are applied to the plurality of gate bus lines 12 in a line-sequential manner in a pulse manner at a predetermined timing. By turning on the TFT 14 for a certain period, the voltage of the reference bus line 13 is applied to the pixel electrode 11 at a predetermined timing. Data voltages D1 and D2 are supplied to the plurality of data bus lines 22 in a line sequential manner. The alignment state of the liquid crystal disposed between the pixel electrode 11 and the data bus line 22 is changed by the voltage between the pixel electrode 11 and the data bus line 22. As a result, light transmitted through the liquid crystal is modulated, and gradation display is performed.

FIG. 3 is a schematic plan view showing one display element P in an enlarged manner.

The display element P is provided with a pixel electrode 11 on the first substrate and a data bus line 22 on the second substrate that overlaps the pixel electrode 11 in a plane. The data bus line 22 includes a transparent first conductive layer 24 and a second conductive layer 23 having a higher conductivity than the first conductive layer 24.

The first conductive layer 24 is made of a transparent conductive material such as ITO (Indium Tin Oxide; a compound in which tin is added to indium oxide). The width of the first conductive layer 24 in the X direction is the same as or larger than the width of the pixel electrode 11 in the X direction. The first conductive layer 24 extends linearly in the Y direction so as to overlap the entire plurality of pixel electrodes 11 arranged in the Y direction. The light modulated by the liquid crystal layer passes through the first conductive layer 24 and is visually recognized by an observer.

The second conductive layer 23 is made of a conductive material having a lower transmittance than the first conductive layer 24, for example, an opaque or nearly opaque conductive material such as Al. The second conductive layer 23 functions as an auxiliary wiring for reducing the electric resistance of the data bus line 22. The width of the second conductive layer 23 in the X direction is smaller than the width of the pixel electrode 11 in the X direction. The second conductive layer 23 passes through the center of the pixel electrode 11 and extends in a straight line in the Y direction so as to overlap with the plurality of pixel electrodes 11 arranged in the Y direction.

FIG. 4 is a cross-sectional view taken along the line AA in FIG.

The liquid crystal display device 1 includes a first substrate 10 and a second substrate 20 disposed to face the first substrate 10. A liquid crystal layer 30 made of nematic liquid crystal having negative dielectric anisotropy is sandwiched between the first substrate 10 and the second substrate 20. The first substrate 10 is made of a translucent substrate such as glass or plastic. On the liquid crystal layer 30 side of the first substrate 10, a circuit layer 18 including the gate bus line 12, the reference bus line 13 and the TFT 14 shown in FIG. 3 is formed. A pixel electrode 11 made of a transparent conductive material such as ITO is formed on the circuit layer 18. A first alignment film 19 made of polyimide or the like is formed so as to cover the pixel electrode 11.

The second substrate 20 is made of a translucent substrate such as glass or plastic. A color filter layer 21 is formed on the liquid crystal layer 30 side of the second substrate 20. The color filter layer 21 includes a red color filter 21R, a green color filter 21G, a blue color filter 21B, and a black matrix BM. The black matrix BM is formed in a lattice shape at a position facing the gap portion of the pixel electrode 11. A data bus line 22 is formed on the color filter layer 21. The data bus line 22 is formed by laminating a second conductive layer 23 and a first conductive layer 24 in order from the color filter layer 21 side. A second alignment film 29 made of polyimide or the like is formed so as to cover the data bus line 22.

A first polarizing plate 38 is disposed on the opposite side of the liquid crystal layer 30 with the first substrate 10 interposed therebetween. A second polarizing plate 39 is disposed on the opposite side of the liquid crystal layer 30 across the second substrate 20. The transmission axis of the first polarizing plate 38 and the transmission axis of the second polarizing plate 39 are orthogonal to each other. A backlight device 40 is disposed on the opposite side of the liquid crystal layer 30 with the first polarizing plate 38 interposed therebetween.

The first alignment film 19 and the second alignment film 29 are vertical alignment films that align liquid crystal in a direction perpendicular to the surface of the alignment film. The first alignment film 19 and the second alignment film 29 give a pretilt angle of several degrees to the liquid crystal in a state where no voltage is applied between the pixel electrode 11 and the data bus line 22. The first alignment film 19 and the second alignment film 29 are provided with a plurality of regions for pretilting the liquid crystal in different directions without applying a voltage between the pixel electrode 11 and the data bus line 22. In the liquid crystal layer 30, a plurality of domains (multidomains) having different alignment states of the liquid crystals are formed. In the example of FIG. 4, two first alignment regions 191 and 192 provided in the first alignment film 19 with different pretilt directions and two second alignments provided in the second alignment film 29 with different pretilt directions are provided. By the areas 291 and 292, four domains are formed in one display element (in the arrangement area of the one pixel electrode 11).

“Pretilt” is a state in which the alignment direction of the liquid crystal (the molecular long axis direction of the liquid crystal) is slightly inclined from the direction perpendicular to the surface of the alignment film (Z direction) to the horizontal direction (direction parallel to the XY plane) Say. The “pretilt angle” refers to an angle formed between the molecular long axis of the liquid crystal and the Z axis. The “pretilt direction” refers to a direction in which a direction parallel to the molecular long axis of the liquid crystal and directed from the side closer to the alignment film to the side farther is projected onto the XY plane.

As a method for giving a pretilt angle to the liquid crystal, there are a method of performing a rubbing process on the alignment film, a method of performing a photo alignment process on the alignment film, and the like. Even if the alignment film is formed by oblique vapor deposition, a pretilt angle can be imparted to the liquid crystal. The photo-alignment treatment can easily realize a multi-domain structure by a simple method. Therefore, the liquid crystal display device 1 performs the alignment process on the first alignment film 19 and the second alignment film 29 by the photo-alignment process. Of course, such an alignment treatment method is an example, and the alignment treatment method of the first alignment film 19 and the second alignment film 29 is not limited to this.

5A and 5B are schematic views showing the alignment state of the liquid crystal 31 in one domain LD. FIG. 5A is a schematic diagram showing an alignment state (off state) of the liquid crystal 31 in a state where no voltage is applied between the pixel electrode and the data bus line, and FIG. 5B is a diagram between the pixel electrode and the data bus line. It is a schematic diagram which shows the orientation state (ON state) of the liquid crystal 31 when a voltage is applied.

As shown in FIG. 5A, the first alignment film 19 and the second alignment film 29 align the liquid crystal 31 in the vicinity of the alignment film in a direction that forms an angle θ _P (<90 °) with respect to the XY plane. The pretilt direction 19a of the liquid crystal 31 in the vicinity of the first alignment film 19 and the pretilt direction 29a of the liquid crystal 31 in the vicinity of the second alignment film 29 are orthogonal to each other. The liquid crystal 30 takes a VATN (Vertical Alignment Twisted Nematic) mode in which the first alignment film 19 and the second alignment film 29 are twisted by 90 °. The liquid crystal 31 in the central portion of the liquid crystal layer that contributes to display is substantially vertically aligned, and the pretilt direction is a direction that forms 45 ° with the pretilt direction 19 a of the first alignment film 19.

As shown in FIG. 5B, when a voltage is applied between the pixel electrode and the data bus line, the liquid crystal 31 is aligned in a direction parallel to the film surface of the alignment film according to the applied voltage, and is transmitted through the liquid crystal layer 30. Exhibits birefringence. The alignment state of the liquid crystal 31 in the vicinity of the first alignment film 19 and the liquid crystal 31 in the vicinity of the second alignment film 29 hardly change even in the on state due to the anchoring effect of the alignment film. On the other hand, the alignment state of the liquid crystal 31 at the center of the liquid crystal layer 30 changes from a direction perpendicular to the film surface of the alignment film to a direction parallel to the film surface in the on state. The change in the alignment state occurs in a plane including the Z direction and the pretilt direction 19a of the first alignment film 19 and a direction that forms 45 °.

FIG. 6 is a schematic diagram showing the alignment relationship between the alignment treatment direction of the alignment films 19 and 29 in one display element, the transmission axes of the polarizing plates 38 and 39, and the second conductive layer 23 of the data bus line.

The transmission axis 38a of the first polarizing plate 38 is parallel to the Y axis, and the transmission axis 39a of the second polarizing plate 39 is parallel to the X axis. The extending direction of the second conductive layer 23 of the data bus line is parallel to the Y axis.

The first alignment film 19 has two first alignment regions 191 and 192 that tilt the liquid crystal in the Y direction in one display element. The two first alignment regions 191 and 192 are provided so as to divide one display element into two with a straight line 51 parallel to the Y axis interposed therebetween. The liquid crystal tilt directions in the two first alignment regions 191 and 192 are opposite to each other across a straight line parallel to the Z axis.

The second alignment film 29 has two second alignment regions 291 and 292 for tilting the liquid crystal in the X direction in one display element. The two second alignment regions 291 and 292 are provided so as to divide one display element into two with a straight line 52 parallel to the X axis interposed therebetween. The tilt directions of the liquid crystals in the two second alignment regions 291 and 292 are opposite to each other across a straight line parallel to the Z axis.

A region where the first alignment region 191 and the second alignment region 291 overlap, a region where the first alignment region 192 and the second alignment region 291 overlap, a region where the first alignment region 191 and the second alignment region 292 overlap, and Four domains are formed by the region where the first alignment region 192 and the second alignment region 292 overlap. The boundary between the four domains overlaps with the straight line 51 and the straight line 52.

The second conductive layer 23 of the data bus line is disposed so as to overlap the boundary portion 51 between the first alignment region 191 and the first alignment region 192. Therefore, the second conductive layer 23 overlaps at least a part of the boundary between the four domains.

In FIG. 6, the transmission axis 38a of the first polarizing plate 38 is parallel to the Y axis, and the transmission axis 39a of the second polarizing plate 39 is parallel to the X axis. May be parallel to the X axis, and the transmission axis 39a of the second polarizing plate 39 may be parallel to the Y axis.

The first alignment film 19 and the second alignment film 29 are formed by, for example, baking at 180 ° C. for 60 minutes after applying a solution containing the photo-alignment film material to the substrate. A known material can be used as the photo-alignment film material. A polyimide containing a photosensitive group such as a 4-chalcone group, a 4'-chalcone group, a coumarin group, or a cinnamoyl group is preferable. These photosensitive groups cause crosslinking reaction (including dimerization reaction), isomerization reaction, photoreorientation, etc. by UV irradiation, and reduce variation in pretilt angle compared to photodegradable photoalignment film materials. Can do.

The photo-alignment treatment is performed using an exposure apparatus that irradiates the alignment films 19 and 29 with ultraviolet rays obliquely. The first alignment regions 191 and 192 are irradiated with ultraviolet rays from a direction inclined by a predetermined angle θ with respect to the Z direction. The directions of the ultraviolet rays irradiated to the first alignment region 191 and the first alignment region 192 are such that, when the optical axis of the irradiated ultraviolet rays is projected onto the XY plane, the projected optical axes are parallel to the Y axis and are substantially the same. The direction is 180 ° different. The second alignment regions 291 and 292 are irradiated with ultraviolet rays from a direction inclined by a predetermined angle θ with respect to the Z direction. The directions of the ultraviolet rays irradiated to the second alignment region 291 and the first alignment region 292 are such that, when the optical axes of the irradiated ultraviolet rays are projected on the XY plane, the projected optical axes are parallel to the X axis and are substantially the same. The direction is 180 ° different.

The incident angle of ultraviolet rays incident on the first alignment regions 191 and 192 and the incident angle of ultraviolet rays incident on the second alignment regions 291 and 292 may be the same or different. The incident angle of the ultraviolet light incident on the first alignment region 191 and the incident angle of the ultraviolet light incident on the first alignment region 192 may be the same or different. The incident angle of the ultraviolet light incident on the second alignment region 291 and the incident angle of the ultraviolet light incident on the second alignment region 292 may be the same or different.

The exposure apparatus may be any apparatus that selectively irradiates ultraviolet rays onto a specific region of the alignment film through a photomask. When performing a photo-alignment process on a large liquid crystal display device, the substrate becomes large, so a photomask and a light source for ultraviolet irradiation are used on the substrate using a small photomask with slit-shaped openings. It is desirable to scan (relative movement). For example, using a photomask that shields the first alignment region 192, the ultraviolet light irradiation light source is scanned in the + Y direction while irradiating the first alignment region 191 with the ultraviolet light 53, and then the first alignment region 191 is shielded from light. Irradiating the first alignment region 192 with the ultraviolet ray 54 and scanning the ultraviolet irradiation light source in the −Y direction. Further, using a photomask that shields the second alignment region 292, the UV light source is scanned in the + X direction while irradiating the second alignment region 291 with the ultraviolet light 55, and then the photomask that shields the second alignment region 291. Irradiating the second alignment region 292 with the ultraviolet ray 56 and scanning the ultraviolet irradiation light source in the −X direction.

When the ultraviolet light source and the substrate are moved relative to each other, an existing pattern formed on the substrate, for example, a gate bus line, a reference bus line, a black matrix, a data bus line (first conductive layer, second substrate) It is desirable to take a pattern of a conductive layer), a pixel electrode, and the like, and a positioning mark provided on the photomask with a camera, and to control an ultraviolet irradiation position using the taken image.

7A to 7C are schematic views of the alignment state of the liquid crystal 31 as viewed from the second substrate side. FIG. 7A is a schematic diagram showing the alignment state of the liquid crystal 31 in the vicinity of the first alignment film 19. FIG. 7B is a schematic diagram showing the alignment state of the liquid crystal 31 in the vicinity of the second alignment film 29. FIG. 7C is a schematic diagram illustrating the alignment state of the liquid crystal 31 at the center portion in the layer thickness direction of the liquid crystal layer 30. In the figure, the portion shown in a columnar shape is the liquid crystal 31, and the liquid crystal 31 is tilted so that the end of the liquid crystal 31 is closer to the second substrate side.

There is a correlation between the irradiation direction of the ultraviolet rays 53 to 56 and the pretilt direction of the liquid crystal 31. As the irradiation directions of the ultraviolet rays 53 and 54 are different within one display element, two first alignment regions 191 and 192 whose pretilt direction is parallel to and antiparallel to the Y direction are formed in the first alignment film 19. Yes. As the irradiation directions of the ultraviolet rays 55 and 56 are different within one display element, two first alignment regions 191 and 192 whose pretilt directions are parallel to the X direction and antiparallel to each other are formed in the second alignment film 29. ing.

When the direction of the ultraviolet rays 53 to 56 irradiated to the alignment films 19 and 29 is defined as the direction of the projected optical axis obtained by projecting the optical axis of the ultraviolet rays 53 to 56 onto the XY plane, the ultraviolet rays irradiated to the first alignment region 191 The direction is the + Y direction, and the direction of the ultraviolet rays applied to the first alignment region 192 is the −Y direction. The direction of ultraviolet rays irradiated to the second alignment region 291 is the + X direction, and the direction of ultraviolet rays irradiated to the second alignment region 292 is the −X direction. Thus, the tilt directions of the liquid crystal 31 in the first alignment region 191 and the first alignment film 192 are opposite to each other across a straight line parallel to the Z axis, and the liquid crystal 31 in the second alignment region 291 and the second alignment film 292 The tilt directions are opposite to each other across a straight line parallel to the Z axis.

As a result, a domain 32 is formed in a region where the first alignment region 191 and the second alignment region 291 face each other, a domain 33 is formed in a region where the first alignment region 191 and the second alignment region 292 face each other, and A domain 34 is formed in a region where the first alignment region 192 and the second alignment region 292 face each other, and a domain 35 is formed in a region where the first alignment region 192 and the second alignment region 291 face each other.

In the domains 32 to 35, the pretilt directions of the liquid crystal 31 at the center of the liquid crystal layer 30 in the layer thickness direction are different from each other. In the domains 32 to 35, the change in the alignment state of the liquid crystal 31 occurs in a plane including the axis that forms 45 ° with the X axis and the Z axis. In the domains 32 and 34, the tilt directions of the liquid crystal 31 are opposite to each other across a straight line that passes through the center of the pixel electrode and is parallel to the Z axis. In the domain 33 and the domain 35, the tilt direction of the liquid crystal 31 is opposite to each other across a straight line passing through the center of the pixel electrode and parallel to the Z axis.

FIG. 8 is a schematic diagram showing the luminance distribution in one display element in the on state.

4 domains 32 to 35 are formed in one display element. The boundary portion 36 between the domain 32 and the domain 35 and the boundary portion 36 between the domain 33 and the domain 34 coincide with the boundary portions between the two first alignment regions 191 and 192 shown in FIG. 7A. The boundary portion 36 between the domain 32 and the domain 33 and the boundary portion 36 between the domain 35 and the domain 34 coincide with the boundary portions between the two second alignment regions 291 and 292 shown in FIG. 7B.

A swirl type dark line 37 caused by an orientation defect is formed in one display element. The dark line 37 includes a straight line portion 37a generated at the domain boundary part 36 parallel to the Y axis, a straight line part 37b generated at the domain boundary part 36 parallel to the X axis, and a straight line part 37c generated at the edge of the pixel electrode. Have The dark line 37 is caused by an alignment defect caused by disorder of alignment at the domain boundary portion or an oblique electric field at the periphery of the pixel electrode, and the position thereof is fixed.

FIG. 9 is a schematic diagram showing an arrangement relationship between the dark line 37 and the second conductive layer 23 of the data bus line. FIG. 9 shows the second conductive layer 23 of the data bus line superimposed on the luminance distribution for two display elements in the ON state.

As shown in FIG. 6, the second conductive layer 23 is disposed so as to overlap the boundary portion 51 between the first alignment region 191 and the first alignment region 192. Therefore, the second conductive layer 23 overlaps the domain boundary portion 36 parallel to the Y axis. Since the second conductive layer 23 is made of an opaque conductive material, the arrangement region of the second conductive layer 23 becomes a light shielding region. However, since the dark line 37 is an area that does not contribute to display, if the second conductive layer 23 is disposed at a position overlapping the dark line 37, the aperture ratio does not significantly decrease. Therefore, bright display can be achieved while realizing a wide viewing angle by multi-domain (orientation division).

(Second Embodiment)
FIG. 10 is an enlarged schematic plan view showing one display element P of the liquid crystal display device 2 which is the second embodiment of the active matrix type liquid crystal display device driven by the counter drive method. The liquid crystal display device 2 is a VATN type liquid crystal display device having an alignment division structure, like the liquid crystal display device 1 of the first embodiment. In the liquid crystal display device 2, the same components as those in the liquid crystal display device 1 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

The difference between the liquid crystal display device 2 and the liquid crystal display device 1 of the first embodiment is the shape of the second conductive layer 26 of the data bus line 25. Although the second conductive layer 23 of the liquid crystal display device 1 is formed linearly in the Y direction, the second conductive layer 26 of the liquid crystal display device 2 extends in the X direction and a first straight portion 26a extending in the Y direction. The second straight portion 26b and a third straight portion 26c extending along the peripheral edge of the pixel electrode 11 are bent.

The first straight line portion 26a is arranged so as to overlap the boundary portion 51 between the first alignment region 191 and the first alignment region 192 shown in FIG. The second straight portion 26b is disposed so as to overlap the boundary portion 52 between the second alignment region 291 and the second alignment region 292 shown in FIG. The third straight portion 26c is arranged so as to overlap with a region where an alignment defect is generated at the peripheral portion of the pixel electrode.

FIG. 11 is a schematic diagram showing an arrangement relationship between the dark line 37 and the second conductive layer 26 of the data bus line. FIG. 11 shows the second conductive layer 26 of the data bus line superimposed on the luminance distribution for two display elements in the ON state.

The first straight portion 26 a of the second conductive layer 26 is disposed so as to overlap the boundary portion 51 between the first alignment region 191 and the first alignment region 192. Therefore, the first straight portion 26 a overlaps with the straight portion 37 a of the dark line 37. The second straight portion 26 b of the second conductive layer 26 is disposed so as to overlap the boundary portion 52 between the second alignment region 291 and the second alignment region 292. Therefore, the second straight portion 26 b overlaps with the straight portion 37 b of the dark line 37. The third straight portion 26c of the second conductive layer 26 is disposed so as to overlap with a region where an alignment defect is generated at the edge of the pixel electrode. Therefore, the third straight portion 26 c overlaps with the straight portion 37 c of the dark line 37.

The second conductive layer 26 is made of an opaque conductive material. Therefore, the arrangement region of the second conductive layer 26 becomes a light shielding region. However, since the dark line 37 is an area that does not contribute to display, if the second conductive layer 26 is disposed at a position overlapping the dark line 37, the aperture ratio does not decrease greatly. Therefore, bright display is possible.

(Third embodiment)
FIG. 12 shows the alignment treatment direction of the alignment films 19 and 29 in one display element of the liquid crystal display device 3 which is the third embodiment of the active matrix type liquid crystal display device driven by the counter driving method, and the polarizing plates 38 and 39. It is a schematic diagram which shows the arrangement | positioning relationship of the 2nd conductive layer 23 of the transmission axes 38a and 39a of this, and a data bus line. The liquid crystal display device 3 is a VATN type liquid crystal display device having an alignment division structure, like the liquid crystal display device 1 of the first embodiment. In the liquid crystal display device 3, the same components as those in the liquid crystal display device 1 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

The liquid crystal display device 3 is different from the liquid crystal display device 1 of the first embodiment in the alignment treatment direction of the alignment films 19 and 29. In the liquid crystal display device 1, the alignment treatment direction of the first alignment regions 191 and 192 is parallel to the Y direction, and the alignment treatment direction of the second alignment regions 291 and 292 is parallel to the X direction. Then, the alignment treatment direction of the first alignment regions 193 and 194 is parallel to the X direction, and the alignment treatment direction of the second alignment regions 293 and 294 is parallel to the Y direction.

The first alignment film 19 has two first alignment regions 193 and 194 that tilt the liquid crystal in the X direction in one display element. The two first alignment regions 193 and 194 are provided so as to divide one display element into two with a straight line 61 parallel to the X axis interposed therebetween. The tilt directions of the liquid crystals in the two first alignment regions 193 and 194 are opposite to each other across a straight line parallel to the Z axis.

The second alignment film 29 has two second alignment regions 293 and 294 for tilting the liquid crystal in the Y direction in one display element. The two second alignment regions 293 and 294 are provided so as to divide one display element into two with a straight line 62 parallel to the Y axis interposed therebetween. The tilt directions of the liquid crystals in the two second alignment regions 293 and 294 are opposite to each other across a straight line parallel to the Z axis.

A region where the first alignment region 193 and the second alignment region 293 overlap, a region where the first alignment region 194 and the second alignment region 293 overlap, a region where the first alignment region 193 and the second alignment region 294 overlap, and Four domains are formed by the region where the first alignment region 194 and the second alignment region 294 overlap. The boundary between the four domains overlaps with the straight line 61 and the straight line 62.

The second conductive layer 23 of the data bus line is disposed so as to overlap the boundary 62 between the second alignment region 293 and the second alignment region 294. Therefore, the second conductive layer 23 overlaps at least a part of the boundary between the four domains.

In the liquid crystal display device 3, the extending direction of the second conductive layer 23 formed on the same second substrate and the boundary portion 62 of the two second alignment regions 293 and 294 of the second alignment film 29 overlap each other. Has been placed. Therefore, when the alignment process is performed on the second alignment film 29, the boundary 62 of the second alignment regions 293 and 294 can be accurately positioned at a position overlapping the second conductive layer 23.

For example, as in the liquid crystal display device 1 of the first embodiment, the boundary portion 51 between the two first alignment regions 191 and 192 of the first alignment film 19 formed on the first substrate 10 and the second substrate 20 When the second conductive layer 23 formed on the first and second conductive layers 23 is overlapped, the accuracy of the positional deviation between the two is determined by the bonding accuracy when the first substrate 10 and the second substrate 20 are bonded by the substrate bonding apparatus. On the other hand, in the liquid crystal display device 3 of the third embodiment, the accuracy of the positional deviation between them is determined by the alignment accuracy of the photomask in the exposure apparatus. Since the alignment accuracy of the photomask in the exposure apparatus is generally higher than the bonding accuracy of the substrate bonding apparatus, the decrease in the aperture ratio caused by the positional deviation between the second conductive layer 23 and the domain boundary portion is reduced. Bright display is possible.

(Fourth embodiment)
FIG. 13 is an enlarged schematic plan view showing one display element P of the liquid crystal display device 4 which is the fourth embodiment of the active matrix type liquid crystal display device driven by the counter drive method. The liquid crystal display device 4 is a VATN type liquid crystal display device having an alignment division structure, similar to the liquid crystal display device 1 of the first embodiment. In the liquid crystal display device 4, the same components as those in the liquid crystal display device 1 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

The liquid crystal display device 4 is different from the liquid crystal display device 1 of the first embodiment in the shape of the second conductive layer 28 of the data bus line 27. Although the second conductive layer 23 of the liquid crystal display device 1 is formed linearly in the Y direction, the second conductive layer 28 of the liquid crystal display device 4 extends in the X direction and a first straight portion 28a extending in the Y direction. The second straight portion 28 b and the third straight portion 28 c extending along the peripheral edge of the pixel electrode 11 are bent.

The first straight line portion 28a is disposed so as to overlap the boundary portion 51 between the first alignment region 191 and the first alignment region 192 shown in FIG. The second straight portion 28b is arranged so as to overlap with the boundary portion 52 between the second alignment region 291 and the second alignment region 292 shown in FIG. The third straight line portion 28c is disposed so as to overlap with a region where an alignment defect occurs at the peripheral edge of the pixel electrode.

14A and 14B are schematic diagrams showing the luminance distribution in one display element in the on state. FIG. 14A is a schematic diagram illustrating a first form of the luminance distribution, and FIG. 14B is a schematic diagram illustrating a second form of the luminance distribution. The luminance distribution of the first form and the luminance distribution of the second form occur in different display elements in the same image display area.

In the luminance distribution of FIG. 14A, swirl type dark lines 37 caused by orientation defects are formed in one display element. The dark line 37 includes a straight line portion 37a generated at the domain boundary part 36 parallel to the Y axis, a straight line part 37b generated at the domain boundary part 36 parallel to the X axis, and a straight line part 37c generated at the edge of the pixel electrode. Have The dark line 37 is caused by an alignment defect caused by disorder of alignment at the domain boundary portion or an oblique electric field at the periphery of the pixel electrode, and the position thereof is fixed.

In the luminance distribution of FIG. 14B, a “8” -shaped dark line 37 caused by an alignment defect is formed in one display element. The luminance distribution in FIG. 14B is generated when the alignment division structure described in FIG. 22 is applied. The dark line 37 includes a straight line portion 37a generated at the domain boundary part 36 parallel to the Y axis, a straight line part 37b generated at the domain boundary part 36 parallel to the X axis, and a straight line part 37c generated at the edge of the pixel electrode. Have The dark line 37 is caused by an alignment defect caused by disorder of alignment at the domain boundary portion or an oblique electric field at the periphery of the pixel electrode, and the position thereof is fixed.

FIG. 15 is a schematic diagram showing an arrangement relationship between the dark line 37 and the second conductive layer 28 of the data bus line. FIG. 15 displays the second conductive layer 28 of the data bus line superimposed on the luminance distribution of two display elements indicating the luminance distribution of the first form shown in FIG. 14A and the luminance distribution of the second form shown in FIG. 14B. is doing.

The first straight portion 28 a of the second conductive layer 28 is disposed so as to overlap the boundary portion 51 between the first alignment region 191 and the first alignment region 192. Therefore, the first straight portion 28 a overlaps with the straight portion 37 a of the dark line 37. The second straight portion 28 b of the second conductive layer 28 is disposed so as to overlap the boundary portion 52 between the second alignment region 291 and the second alignment region 292. For this reason, the second straight line portion 28 b overlaps with the straight line portion 37 b of the dark line 37. The third straight portion 28c of the second conductive layer 28 is disposed so as to overlap with a region where an alignment defect is generated at the edge of the pixel electrode. Therefore, the third straight line portion 28 c overlaps with the straight line portion 37 c of the dark line 37.

The second conductive layer 28 is made of an opaque conductive material. Therefore, the arrangement region of the second conductive layer 28 is a light shielding region. However, since the dark line 37 is a region that does not contribute to display, if the second conductive layer 28 is disposed at a position overlapping the dark line 37, the aperture ratio does not decrease greatly. Therefore, bright display is possible.

(Fifth embodiment)
FIG. 16 is an enlarged schematic plan view showing one display element P of the liquid crystal display device 5 which is the fifth embodiment of the active matrix type liquid crystal display device driven by the counter drive method. The liquid crystal display device 5 is a VATN type liquid crystal display device having an alignment division structure, like the liquid crystal display device 1 of the first embodiment. In the liquid crystal display device 5, the same components as those of the liquid crystal display device 1 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

The liquid crystal display device 5 is different from the liquid crystal display device 1 of the first embodiment in the shape of the second conductive layer 71 of the data bus line 70. Although the second conductive layer 23 of the liquid crystal display device 1 is formed linearly in the Y direction, the second conductive layer 71 of the liquid crystal display device 5 extends in the X direction and the first straight portion 71a extending in the Y direction. The second linear portion 71b and the third linear portion 71c extending along the peripheral edge of the pixel electrode 11 are bent. In addition, the second conductive layer 23 of the liquid crystal display device 1 is formed over the plurality of display elements P, but the second conductive layer 71 of the liquid crystal display device 5 is formed separately for each display element P. The second conductive layer 71 of each display element P is electrically connected via the first conductive layer 24.

The first straight line portion 71a is disposed so as to overlap the boundary portion 51 between the first alignment region 191 and the first alignment region 192 shown in FIG. The second straight line portion 71b is disposed so as to overlap the boundary portion 52 between the second alignment region 291 and the second alignment region 292 shown in FIG. The third straight portion 71c is arranged so as to overlap with a region where an alignment defect is generated at the peripheral portion of the pixel electrode.

FIG. 17 is a schematic diagram showing an arrangement relationship between the dark line 37 and the second conductive layer 71 of the data bus line. FIG. 17 shows the second conductive layer 71 of the data bus line superimposed on the luminance distribution for two display elements in the on state.

The first straight line portion 71 a of the second conductive layer 71 is disposed so as to overlap the boundary portion 51 between the first alignment region 191 and the first alignment region 192. Therefore, the first straight line portion 71 a overlaps with the straight line portion 37 a of the dark line 37. The second straight portion 71 b of the second conductive layer 71 is disposed so as to overlap with the boundary portion 52 between the second alignment region 291 and the second alignment region 292. Therefore, the second straight line portion 71 b overlaps with the straight line portion 37 b of the dark line 37. The third straight portion 71c of the second conductive layer 71 is disposed so as to overlap with a region where an alignment defect is generated at the edge of the pixel electrode. Therefore, the third straight line portion 71 c overlaps with the straight line portion 37 c of the dark line 37.

The second conductive layer 71 is made of an opaque conductive material. Therefore, the arrangement region of the second conductive layer 71 is a light shielding region. However, since the dark line 37 is a region that does not contribute to display, if the second conductive layer 71 is disposed at a position overlapping the dark line 37, the aperture ratio does not greatly decrease. Therefore, bright display is possible.

(Sixth embodiment)
FIG. 18 shows the alignment treatment direction of the alignment films 19 and 29 in one display element of the liquid crystal display device 6 which is the sixth embodiment of the active matrix type liquid crystal display device driven by the counter drive method, and the polarizing plates 38 and 39. It is a schematic diagram which shows the arrangement | positioning relationship of the 2nd conductive layer 23 of the transmission axes 38a and 39a of this, and a data bus line. The liquid crystal display device 6 is a VATN type liquid crystal display device having an alignment division structure, like the liquid crystal display device 1 of the first embodiment. In the liquid crystal display device 6, the same components as those in the liquid crystal display device 1 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

The liquid crystal display device 6 is different from the liquid crystal display device 1 of the first embodiment in that a black light absorption layer 80 is provided between the second conductive layer 23 and the liquid crystal layer. As shown in FIG. 4, in the liquid crystal display device 1, the second alignment film 29 is formed so as to cover the surface of the second conductive layer 23, but in the liquid crystal display device 6, the surface of the second conductive layer 23 is formed. A black light absorption layer 80 is formed. The second alignment film 29 is formed on the surface of the light absorption layer 80.

The second conductive layer 23 may be formed of a metal material such as Al. Since the second conductive layer 23 made of a metal material has a high visible light reflectivity, the second conductive layer 23 is modulated by the liquid crystal layer without any treatment on the liquid crystal layer side surface of the second conductive layer 23. In some cases, a part of the modulated light is reflected. The modulated light reflected by the second conductive layer 23 becomes stray light and may reduce the contrast. Therefore, in the liquid crystal display device 6, the modulated light that has passed through the liquid crystal layer and entered the second conductive layer 23 is absorbed by the light absorption layer 80, thereby suppressing a decrease in contrast.

(Seventh embodiment)
FIG. 19 shows the alignment treatment direction of the alignment films 19 and 29 in one display element of the liquid crystal display device 7 which is the seventh embodiment of the active matrix type liquid crystal display device driven by the counter drive system, and the polarizing plates 38 and 39. It is a schematic diagram which shows the arrangement | positioning relationship of the 2nd conductive layer 23 of the transmission axes 38a and 39a of this, and a data bus line. Similarly to the liquid crystal display device 1 of the first embodiment, the liquid crystal display device 7 is a VATN type liquid crystal display device having an alignment division structure. In the liquid crystal display device 7, the same components as those in the liquid crystal display device 1 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

The liquid crystal display device 7 is different from the liquid crystal display device 1 of the first embodiment in that a black light absorption layer 81 is provided on the opposite side of the liquid crystal layer with the second conductive layer 23 interposed therebetween. As shown in FIG. 4, in the liquid crystal display device 1, the second conductive layer 23 is formed on the surface of the first conductive layer 24, but in the liquid crystal display device 7, the light absorbing layer is formed on the surface of the first conductive layer. 81 is formed, and the second conductive layer 23 is formed on the surface of the light absorption layer 81.

The second conductive layer 23 may be formed of a metal material such as Al. Since the second conductive layer 23 made of a metal material has a high visible light reflectivity, the second conductive layer 23 is formed in the second conductive layer 23 without any treatment on the surface of the second conductive layer 23 on the second polarizing plate 39 side. In some cases, part of external light incident from the two polarizing plates 39 is reflected. There is a possibility that the external light reflected by the second conductive layer 23 is superimposed on the modulated light modulated by the liquid crystal layer and the contrast is lowered. Therefore, in the liquid crystal display device 7, external light that has passed through the second polarizing plate 39 and entered from the second substrate side is absorbed by the light absorption layer 81, and a reduction in contrast is suppressed.

In FIG. 19, the light absorption layer 81 is formed on the back surface of the second conductive layer, that is, between the first conductive layer 24 and the second conductive layer 23 of the data bus line. Is not limited to this. The light absorption layer 81 may be formed between the first conductive layer 24 and the second substrate 20 of the data bus line 22 illustrated in FIG. 4. For example, the light absorption layer 81 may be formed simultaneously with the black matrix BM of the color filter layer 21. In this case, it is not necessary to newly add a step of forming the light absorption layer 81, and the manufacturing process is simplified.

(Eighth embodiment)
FIG. 20 shows the alignment treatment direction of the alignment films 19 and 29 in one display element of the liquid crystal display device 8 which is the eighth embodiment of the active matrix type liquid crystal display device driven by the counter drive method, and the polarizing plates 38 and 39. It is a schematic diagram which shows the arrangement | positioning relationship of the 2nd conductive layer 23 of the transmission axes 38a and 39a of this, and a data bus line. The liquid crystal display device 8 is a VATN type liquid crystal display device having an alignment division structure, like the liquid crystal display device 1 of the first embodiment. In the liquid crystal display device 8, the same components as those in the liquid crystal display device 1 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

The liquid crystal display device 8 is different from the liquid crystal display device 1 of the first embodiment in that a black light absorption layer 83 is provided between the second conductive layer 23 and the liquid crystal layer, and the second conductive layer 23 is sandwiched between the liquid crystals. The black light absorption layer 82 is provided on the opposite side to the layer. As shown in FIG. 4, in the liquid crystal display device 1, the second conductive layer 23 is formed on the surface of the first conductive layer 24, and the second alignment film 29 is formed to cover the surface of the second conductive layer 23. However, in the liquid crystal display device 8, the light absorption layer 82 is formed on the surface of the first conductive layer, the second conductive layer 23 is formed on the surface of the light absorption layer 82, and light absorption is performed on the surface of the second conductive layer 23. The layer 83 is formed, and the second alignment film 29 is formed on the surface of the light absorption layer 83.

The second conductive layer 23 may be formed of a metal material such as Al. Since the second conductive layer 23 made of a metal material has a high visible light reflectivity, the second conductive layer 23 is formed in the second conductive layer 23 without any treatment on the surface of the second conductive layer 23 on the second polarizing plate 39 side. In some cases, part of external light incident from the two polarizing plates 39 is reflected. There is a possibility that the external light reflected by the second conductive layer 23 is superimposed on the modulated light modulated by the liquid crystal layer and the contrast is lowered. If no treatment is performed on the surface of the second conductive layer 23 on the liquid crystal layer side, the second conductive layer 23 may reflect part of the modulated light modulated by the liquid crystal layer. The modulated light reflected by the second conductive layer 23 becomes stray light and may reduce the contrast. Therefore, in the liquid crystal display device 8, the modulated light that has been transmitted through the liquid crystal layer and incident on the second conductive layer 23 is absorbed by the light absorption layer 83, is transmitted through the second polarizing plate 39, and is incident from the second substrate side. Absorption of light by the light absorption layer 82 suppresses a decrease in contrast.

In FIG. 20, the light absorption layer 82 is formed on the back surface of the second conductive layer, that is, between the first conductive layer and the second conductive layer 23 of the data bus line. It is not limited to this. The light absorption layer 82 may be formed between the first conductive layer 24 and the second substrate 20 of the data bus line 22 illustrated in FIG. 4. For example, the light absorption layer 82 may be formed simultaneously with the black matrix BM of the color filter layer 21. In this case, it is not necessary to newly add a step of forming the light absorption layer 82, and the manufacturing process is simplified.

(Ninth embodiment)
21A to 21C are schematic views showing a ninth embodiment of an active matrix liquid crystal display device driven by a counter driving method. 21A to 21C are schematic views of the alignment state of the liquid crystal 31 as viewed from the second substrate side. FIG. 21A is a schematic diagram illustrating the alignment state of the liquid crystal 31 in the vicinity of the first alignment film 19, FIG. 21B is a schematic diagram illustrating the alignment state of the liquid crystal 31 in the vicinity of the second alignment film 29, and FIG. 3 is a schematic diagram illustrating an alignment state of a liquid crystal 31 at a central portion in a layer thickness direction of the liquid crystal layer 30. FIG. In the figure, the portion shown in a columnar shape is the liquid crystal 31, and the liquid crystal 31 is tilted so that the end of the liquid crystal 31 is closer to the second substrate side. The liquid crystal display device of this embodiment is a VATN type liquid crystal display device having an alignment division structure, similar to the liquid crystal display devices of the first to eighth embodiments. In FIGS. 21A to 21C, components common to the liquid crystal display devices of the first to eighth embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

21A to 21C are different from the liquid crystal display devices of the first to eighth embodiments in the irradiation direction of the ultraviolet rays 53 to 56 irradiated to the alignment films 19 and 29. The ultraviolet rays 53 to 56 are applied to the alignment films 19 and 29 from a direction inclined by a predetermined angle from the Z direction. When the direction of the ultraviolet rays applied to the alignment films 19 and 29 is defined as the direction of the projection optical axis obtained by projecting the optical axis of the ultraviolet rays onto the XY plane, each of the alignment regions 191 and 192 in the liquid crystal display device of FIGS. The direction of ultraviolet rays incident on 291 and 292 is as follows.

The direction of ultraviolet rays irradiated to the first alignment region 191 is the −Y direction. The direction of the ultraviolet rays applied to the first alignment region 192 is the + Y direction. The direction of ultraviolet rays irradiated to the second alignment region 291 is the + X direction. The direction of ultraviolet rays irradiated to the second alignment region 292 is the −X direction. Thereby, the tilt directions of the liquid crystal 31 in the first alignment region 191 and the first alignment film 192 are opposite to each other across a straight line parallel to the Z axis. The tilt directions of the liquid crystal 31 in the second alignment region 291 and the second alignment film 292 are opposite to each other across a straight line parallel to the Z axis.

As a result, a domain 32 is formed in a region where the first alignment region 191 and the second alignment region 291 face each other, a domain 33 is formed in a region where the first alignment region 191 and the second alignment region 292 face each other, and A domain 34 is formed in a region where the first alignment region 192 and the second alignment region 292 face each other, and a domain 35 is formed in a region where the first alignment region 192 and the second alignment region 291 face each other. The shape of the dark line is a shape symmetrical to the shape shown in FIG. 14B and the Y axis (“8” shape).

In the domains 32 to 35, the pretilt directions of the liquid crystal 31 at the center in the layer thickness direction of the liquid crystal layer 30 are different from each other. In the domains 32 to 35, the change in the alignment state of the liquid crystal 31 occurs in a plane including the axis that forms 45 ° with the X axis and the Z axis. In the domains 32 and 34, the tilt directions of the liquid crystal 31 are opposite to each other across a straight line that passes through the center of the pixel electrode and is parallel to the Z axis. In the domain 33 and the domain 35, the tilt direction of the liquid crystal 31 is opposite to each other across a straight line passing through the center of the pixel electrode and parallel to the Z axis.

(Tenth embodiment)
22A to 22C are schematic views showing a tenth embodiment of an active matrix liquid crystal display device driven by a counter driving method. 22A to 22C are schematic views of the alignment state of the liquid crystal 31 as viewed from the second substrate side. 22A is a schematic diagram showing the alignment state of the liquid crystal 31 in the vicinity of the first alignment film 19, FIG. 22B is a schematic diagram showing the alignment state of the liquid crystal 31 in the vicinity of the second alignment film 29, and FIG. 3 is a schematic diagram illustrating an alignment state of a liquid crystal 31 at a central portion in a layer thickness direction of the liquid crystal layer 30. FIG. In the figure, the portion shown in a columnar shape is the liquid crystal 31, and the liquid crystal 31 is tilted so that the end of the liquid crystal 31 is closer to the second substrate side. The liquid crystal display device of this embodiment is a VATN type liquid crystal display device having an alignment division structure, similar to the liquid crystal display devices of the first to eighth embodiments. 22A to 22C, components common to the liquid crystal display devices of the first to eighth embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

22A to 22C are different from the liquid crystal display devices of the first to eighth embodiments in the irradiation direction of the ultraviolet rays 53 to 56 irradiated to the alignment films 19 and 29. The ultraviolet rays 53 to 56 are applied to the alignment films 19 and 29 from a direction inclined by a predetermined angle from the Z direction. If the direction of the ultraviolet rays applied to the alignment films 19 and 29 is defined as the direction of the projection optical axis obtained by projecting the optical axis of the ultraviolet rays onto the XY plane, the alignment regions 191, 192 and 192 in the liquid crystal display device of FIGS. The direction of ultraviolet rays incident on 291 and 292 is as follows.

The direction of ultraviolet rays irradiated to the first alignment region 191 is the + Y direction. The direction of ultraviolet rays irradiated to the first alignment region 192 is the −Y direction. The direction of ultraviolet rays irradiated to the second alignment region 291 is the + X direction. The direction of ultraviolet rays irradiated to the second alignment region 292 is the −X direction. Thus, the tilt directions of the liquid crystal 31 in the first alignment region 191 and the first alignment film 192 are opposite to each other across a straight line parallel to the Z axis. The tilt directions of the liquid crystal 31 in the second alignment region 291 and the second alignment film 292 are opposite to each other across a straight line parallel to the Z axis.

As a result, a domain 32 is formed in a region where the first alignment region 191 and the second alignment region 291 face each other, a domain 33 is formed in a region where the first alignment region 191 and the second alignment region 292 face each other, and A domain 34 is formed in a region where the first alignment region 192 and the second alignment region 292 face each other, and a domain 35 is formed in a region where the first alignment region 192 and the second alignment region 291 face each other. The shape of the dark line is the shape shown in FIG. 14B.

In the domains 32 to 35, the pretilt directions of the liquid crystal 31 at the center in the layer thickness direction of the liquid crystal layer 30 are different from each other. In the domains 32 to 35, the change in the alignment state of the liquid crystal 31 occurs in a plane including the axis that forms 45 ° with the X axis and the Z axis. In the domains 32 and 34, the tilt directions of the liquid crystal 31 are opposite to each other across a straight line that passes through the center of the pixel electrode and is parallel to the Z axis. In the domain 33 and the domain 35, the tilt direction of the liquid crystal 31 is opposite to each other across a straight line passing through the center of the pixel electrode and parallel to the Z axis.

(Eleventh embodiment)
23A to 23C are schematic views showing an eleventh embodiment of an active matrix type liquid crystal display device driven by a counter driving method. 23A to 23C are schematic views of the alignment state of the liquid crystal 31 as viewed from the second substrate side. FIG. 23A is a schematic diagram illustrating the alignment state of the liquid crystal 31 in the vicinity of the first alignment film 19, FIG. 23B is a schematic diagram illustrating the alignment state of the liquid crystal 31 in the vicinity of the second alignment film 29, and FIG. 4 is a schematic diagram illustrating an alignment state of a liquid crystal 31 at a central portion in a thickness direction of the liquid crystal layer 30. FIG. In the figure, the portion shown in a columnar shape is the liquid crystal 31, and the liquid crystal 31 is tilted so that the end of the liquid crystal 31 is closer to the second substrate side. The liquid crystal display device of the present embodiment is a VATN type liquid crystal display device having an alignment division structure, similarly to the liquid crystal display devices of the first to eighth embodiments. 23A to 23C, the same reference numerals are given to the same components as those of the liquid crystal display devices of the first embodiment to the eighth embodiment, and detailed description thereof will be omitted.

23A to 23C are different from the liquid crystal display devices according to the first to eighth embodiments in the irradiation directions of the ultraviolet rays 53 to 56 applied to the alignment films 19 and 29. The ultraviolet rays 53 to 56 are applied to the alignment films 19 and 29 from a direction inclined by a predetermined angle from the Z direction. When the direction of ultraviolet rays applied to the alignment films 19 and 29 is defined as the direction of the projection optical axis obtained by projecting the optical axis of the ultraviolet rays onto the XY plane, the alignment regions 191, 192 and 192 in the liquid crystal display device of FIGS. The direction of ultraviolet rays incident on 291 and 292 is as follows.

The direction of ultraviolet rays irradiated to the first alignment region 191 is the −Y direction. The direction of the ultraviolet rays applied to the first alignment region 192 is the + Y direction. The direction of ultraviolet rays irradiated to the second alignment region 291 is the −X direction. The direction of ultraviolet rays irradiated to the second alignment region 292 is the + X direction. Thereby, the tilt directions of the liquid crystal 31 in the first alignment region 191 and the first alignment film 192 are opposite to each other across a straight line parallel to the Z axis. The tilt directions of the liquid crystal 31 in the second alignment region 291 and the second alignment film 292 are opposite to each other across a straight line parallel to the Z axis.

As a result, a domain 32 is formed in a region where the first alignment region 191 and the second alignment region 291 face each other, a domain 33 is formed in a region where the first alignment region 191 and the second alignment region 292 face each other, and A domain 34 is formed in a region where the first alignment region 192 and the second alignment region 292 face each other, and a domain 35 is formed in a region where the first alignment region 192 and the second alignment region 291 face each other. The shape of the dark line is a shape symmetrical to the shape shown in FIG. 14A and the Y axis (reverse swirl shape).

In the domains 32 to 35, the pretilt directions of the liquid crystal 31 at the center in the layer thickness direction of the liquid crystal layer 30 are different from each other. In the domains 32 to 35, the change in the alignment state of the liquid crystal 31 occurs in a plane including the axis that forms 45 ° with the X axis and the Z axis. In the domains 32 and 34, the tilt directions of the liquid crystal 31 are opposite to each other across a straight line that passes through the center of the pixel electrode and is parallel to the Z axis. In the domain 33 and the domain 35, the tilt direction of the liquid crystal 31 is opposite to each other across a straight line passing through the center of the pixel electrode and parallel to the Z axis.

(Twelfth embodiment)
FIG. 24 is a schematic diagram showing a twelfth embodiment of an active matrix liquid crystal display device driven by a counter driving method. FIG. 24 is an enlarged plan view showing two display elements P of the liquid crystal display device. The liquid crystal display device of FIG. 24 uses alignment regulating structures 90 and 91 instead of photo-alignment for forming a multi-domain structure. In FIG. 24, only the alignment regulating structures 90 and 91, the pixel electrode 92, and the second wiring layer 75 of the data bus line are shown, and the thin film transistor, the gate bus line, the reference bus line, the first wiring layer of the data bus line, etc. The other components are not shown.

24 is called a multi-domain vertical alignment mode (hereinafter abbreviated as MVA). In the liquid crystal display device of FIG. 24, the liquid crystal 31 having negative dielectric anisotropy is vertically aligned, and the liquid crystal alignment azimuth at the time of voltage application is controlled to a plurality of directions by the alignment regulating structure. In the MVA liquid crystal display device, since the alignment regulating structures 90 and 91 are provided, the alignment film need not be subjected to alignment treatment such as rubbing.

Alignment regulating structures 90 and 91 are provided on the first substrate and the second substrate, respectively. As the alignment regulating structures 90 and 91, a bank (linear protrusion) is provided on a substrate (first substrate, second substrate), and a cutout (slit) is provided on an electrode (pixel electrode, data bus line). There is a technique. In the liquid crystal display device of FIG. 24, first linear protrusions (first alignment regulating structures) 90 that are bent in a “U” shape are formed on the first substrate, and the first linear protrusions 90 are formed on the second substrate. The second linear protrusion 91 (second alignment regulating structure) 91 is formed without being parallel to the substrate, but the alignment regulating structure is formed on at least one of the first substrate and the second substrate. Just do it. The pixel electrode 92 is formed in a shape that is bent in a “U” shape in accordance with the pattern of the alignment regulating structure, and the first conductive layer of the data bus line formed on the second substrate side is also the pixel electrode 92. It is formed in a shape that is bent in a “shape” according to the pattern.

The first linear protrusions 90 and the second linear protrusions 91 are alternately arranged with their positions shifted. The alignment of the liquid crystal 31 is defined by the alignment regulating force in the oblique direction generated by the two linear protrusions 90 and 91, and alignment division in four directions A, B, C, and D shown in FIG. 24 is performed. The domain boundary (not shown) is formed at a position overlapping the alignment regulating structures 90 and 91, and a dark line is generated at the domain boundary. A second conductive layer 75 of the data bus line is formed at the domain boundary so as to overlap the dark line.

In the liquid crystal display device of FIG. 24, the alignment regulating structures 90 and 91 are used for forming the multi-domain structure, and the second wiring layer 75 of the data bus line is formed at a position overlapping the alignment regulating structures 90 and 91. In other words, the pixel electrode 92, the first conductive layer of the data bus line, and the second conductive layer 75 of the data bus line are formed in a "<" shape according to the shape of the alignment regulating structures 90 and 91. Except for this point, it is the same as the liquid crystal display device of the first embodiment.

(13th Embodiment)
FIG. 25 is a schematic diagram showing a thirteenth embodiment of an active matrix liquid crystal display device driven by a counter driving method. FIG. 25 is an enlarged plan view showing one display element P of the liquid crystal display device. The liquid crystal display device of FIG. 25 uses an alignment maintaining layer 95 instead of photo-alignment for forming a multi-domain structure. In FIG. 25, only the alignment maintaining layer 95, the pixel electrode 93, and the second wiring layer 76 of the data bus line are illustrated, and other configurations such as a thin film transistor, a gate bus line, a reference bus line, and a first wiring layer of the data bus line are illustrated. Illustration of elements is omitted.

The liquid crystal display device shown in FIG. 25 is a so-called Polymer Stabilization Alignment (hereinafter abbreviated as PSA). In the liquid crystal display device of FIG. 25, a liquid crystal composition in which a monomer is mixed with liquid crystal 31 is sealed between a first substrate and a second substrate, and a voltage is applied between the first substrate and the second substrate. The alignment orientation layer 95 obtained by polymerizing the monomers in a state where the liquid crystal 31 is tilted to polymerize the liquid crystal orientation orientation during voltage application is controlled to a plurality of orientations. In the PSA liquid crystal display device, since the alignment maintaining layer 95 is provided, the alignment film does not have to be subjected to alignment treatment such as rubbing.

The pixel electrode 93 includes a cross-shaped trunk portion 93a and a plurality of stripe-shaped branch portions 93b branched radially from the trunk portion 93a. One display element P is divided into four regions by a trunk portion 93a formed in a cross shape. The plurality of branch portions 93b formed in each region are arranged in parallel to each other. The liquid crystal 31 is aligned in a direction parallel to the branch portion 93b by an oblique electric field generated at the edge portion of the fine stripe pattern of the branch portion 93b. The alignment sustaining layer 95 acts to maintain this alignment state even after the voltage is removed. The orientation direction by the oblique electric field is parallel to the branch portions 93b arranged in a stripe shape and is directed to the trunk portion 93a. In the pixel electrode structure of FIG. 25, alignment division is performed in the four directions A, B, C, and D in the drawing, and dark lines are generated at the boundary 36 of the domain. A second conductive layer 76 of the data bus line is formed in a cross shape at the domain boundary 36 so as to overlap the dark line.

In the liquid crystal display device of FIG. 25, the alignment maintaining layer 95 is used to form a multi-domain structure, the shape of the pixel electrode 93 includes a trunk portion 93a and a branch portion 93b, and the second wiring layer of the data bus line. The liquid crystal display device of the first embodiment is the same as the liquid crystal display device of the first embodiment except that 76 is formed in a cross shape at a position overlapping the trunk portion 93a.

The present invention can be widely used in the technical field of display devices that perform image display. For example, the present invention can be applied to a direct-view liquid crystal television, a liquid crystal display unit of a portable information terminal, a light valve (liquid crystal engine) of a liquid crystal projector that displays an image on a screen, and the like. The present invention can be applied not only to a transmission type but also to a reflection type liquid crystal display device.

1, 2, 3, 4, 5, 6, 7, 8 Liquid crystal display device 10 First substrate 11 Pixel electrode 10 First alignment film 20 Second substrate 22 Data bus line 23 Second conductive layer 24 First conductive layer 25 Data Bus line 26 Second conductive layer 26a First straight line portion 26b Second straight line portion 26c Third straight line portion 27 Data bus line 28 Second conductive layer 28a First straight line portion 28b Second straight line portion 28c Third straight line portion 29 Second orientation Film 30 Liquid crystal layer 31 Liquid crystal 32, 33, 34, 35 Domain 36 Domain boundary 38 First polarizing plate 38a Transmission axis of first polarizing plate 39 Second polarizing plate 39a Transmission axis of second polarizing plate 51 First alignment region Boundary part 52 Boundary part of the second alignment region 61 Boundary part of the first alignment region 62 Boundary part of the second alignment region 70 Data bus line 71 Second conductive layer 71a 1 straight line portion 71b second straight line portion 71c third straight line portion 75, 76 second conductive layer 80, 81, 82, 83 light absorbing layer 90, 91 alignment regulating structure 92, 93 pixel electrode 95 alignment maintaining layer 191, 192 , 193, 194 First alignment region 291, 292, 293, 294 Second alignment region

Claims (13)

1. A first substrate on which a pixel electrode is formed;
   A second substrate having a data bus line facing the pixel electrode;
   A liquid crystal disposed between the pixel electrode and the data bus line,
   When a voltage is applied between the pixel electrode and the data bus line, a plurality of domains having different alignment directions of the liquid crystal are formed in one pixel electrode arrangement region,
   The data bus line is formed by laminating a transparent first conductive layer and a second conductive layer having higher conductivity and lower transmittance than the first conductive layer,
   The liquid crystal display device, wherein the second conductive layer is formed at a position overlapping a boundary portion of the domain.
2. The liquid crystal is a liquid crystal having negative dielectric anisotropy,
   A first alignment film that vertically aligns the liquid crystal without applying a voltage between the pixel electrode and the liquid crystal is formed on the liquid crystal side surface of the first substrate.
   2. The second alignment film for vertically aligning the liquid crystal in a state where no voltage is applied between the liquid crystal and the data bus line is formed on a surface of the second substrate on the liquid crystal side. Liquid crystal display device.
3. A first polarizing plate is provided on one side of the first substrate;
   A second polarizing plate is provided on one side of the second substrate;
   The transmission axis of the first polarizing plate and the transmission axis of the second polarizing plate are orthogonal to each other,
   In the first alignment film, two first alignment regions for tilting the liquid crystal in a first direction parallel to or orthogonal to the transmission axis of the first polarizing plate are provided in one pixel electrode arrangement region. ,
   The two first alignment regions are provided so as to divide the pixel electrode arrangement region into two across a straight line parallel to the first direction,
   The liquid crystal tilt directions in the two first alignment regions are opposite to each other across a straight line parallel to the normal line of the first substrate,
   In the second alignment film, two second alignment regions for tilting the liquid crystal in a second direction orthogonal to the first direction are provided in one pixel electrode arrangement region,
   The two second alignment regions are provided so as to divide the pixel electrode arrangement region into two across a straight line parallel to the second direction,
   The tilt directions of the liquid crystal in the two second alignment regions are opposite to each other across a straight line parallel to the normal line of the second substrate,
   The liquid crystal display device according to claim 2, wherein the four domains are formed by four regions formed by overlapping the two first alignment regions and the two second alignment regions.
4. 4. The liquid crystal display according to claim 3, wherein the two first alignment regions and the two second alignment regions are formed by performing photo-alignment treatment on the first alignment film and the second alignment film. apparatus.
5. The plurality of domains are arranged on at least one of the first substrate and the second substrate, and are formed by an alignment regulating structure that regulates the alignment direction of the liquid crystal when a voltage is applied. Liquid crystal display device.
6. In the plurality of domains, a liquid crystal composition in which a monomer is mixed with the liquid crystal is sealed between substrates, and a voltage is applied between the substrates to cause the liquid crystal molecules to be tilted to polymerize and polymerize the monomers. The liquid crystal display device according to claim 2, wherein the liquid crystal display device is formed of an alignment maintaining layer.
7. A plurality of the pixel electrodes are arranged on the first substrate in the first direction and the second direction,
   5. The liquid crystal display device according to claim 4, wherein a plurality of the data bus lines extending in the second direction are arranged in the first direction on the second substrate.
8. The liquid crystal display device according to claim 7, wherein the second conductive layer is formed linearly in the second direction across the plurality of pixel electrodes arranged in the second direction.
9. The second conductive layer includes a first straight line that overlaps a boundary between the two first alignment regions or a second straight line that overlaps a boundary between the two second alignment regions in one pixel electrode arrangement region. Part
   The second conductive layers formed in the arrangement region of the adjacent pixel electrodes are connected to each other via a third straight line portion that overlaps with a generation region of an alignment defect generated at an edge portion of the pixel electrode. Item 8. A liquid crystal display device according to item 7.
10. The second conductive layer includes a first straight line portion that overlaps a boundary portion between the two first alignment regions and a second straight line portion that overlaps a boundary portion between the two second alignment regions in one pixel electrode arrangement region. The liquid crystal display device according to claim 7, further comprising a straight line portion.
11. 11. The liquid crystal display device according to claim 10, wherein the second conductive layer has a third straight line portion overlapping an occurrence region of an alignment defect generated at an edge portion of the pixel electrode.
12. The liquid crystal display device according to claim 1, wherein a black light absorption layer is provided between the second conductive layer and the liquid crystal.
13. The liquid crystal display device according to any one of claims 1 to 12, wherein a black light absorption layer is provided on a side opposite to the liquid crystal with the second conductive layer interposed therebetween.

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