JP2009109767A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device of which the yield is easily increased. <P>SOLUTION: The liquid crystal display device (100) includes a vertical alignment mode liquid crystal layer (400) having liquid crystal molecules, a rear substrate (200) having a first alignment layer (270), and a front substrate (300). The first alignment layer (270) has a first alignment region (OR1) on which alignment treatment in a first alignment treatment direction (PD1) is conducted, and a second alignment region (OR2) on which alignment treatment in a second alignment treatment direction (PD2) different from the first alignment treatment direction (PD1) is conducted. A drain leader wire (250) has a contact section (252) in contact with a pixel electrode (260), and the contact section (252) has a shape at least indicating one of the first alignment treatment direction (PD1) and the second alignment treatment direction (PD2). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device including an alignment film that defines a pretilt direction of liquid crystal molecules.

  The liquid crystal display device is used not only as a small display device such as a display unit of a mobile phone but also as a large television. Conventionally, the viewing angle of liquid crystal display devices has been relatively narrow, but in recent years, the viewing angle characteristics of liquid crystal display devices are being improved.

  In a liquid crystal display device (also referred to as a VA mode liquid crystal display device) having a vertical alignment type liquid crystal layer, the MVA mode is adopted as an alignment division structure in which a plurality of liquid crystal domains are formed in one pixel region. The viewing angle characteristics are improved. The MVA mode liquid crystal display device includes an alignment regulation structure provided on at least one liquid crystal layer side of a pair of substrates facing each other with a vertical alignment type liquid crystal layer interposed therebetween, thereby a plurality of alignment directions different from each other. Liquid crystal domains (typically four liquid crystal domains) are formed. As the alignment regulating structure, linear slits (openings) or ribs (projection structures) provided on the electrodes are used, and an alignment regulating force is applied from one or both sides of the liquid crystal layer.

  Unlike the TN mode liquid crystal display device in which the pretilt direction of the liquid crystal molecules is defined by the alignment film, in the MVA mode liquid crystal display device, the alignment regulating force is imparted to the liquid crystal molecules by linear slits or ribs. The alignment regulating force for the liquid crystal molecules in the region varies depending on the distance from the slit or rib, and a difference occurs in the response speed of the liquid crystal molecules in the pixel. Further, in the MVA mode liquid crystal display device, the light transmittance in the region where the slits and ribs are provided is lowered, so that the display luminance is lowered.

  In order to avoid the above-mentioned problem, it has been studied to adopt an alignment division structure using an alignment film that defines the pretilt direction for VA mode liquid crystal display devices (see, for example, Patent Document 1 and Patent Document 2). ). The liquid crystal display devices disclosed in Patent Documents 1 and 2 include a first alignment film and a second alignment film that face each other with a liquid crystal layer interposed therebetween, and each of the first alignment film and the second alignment film includes a liquid crystal display device. It has two alignment regions that define two pretilt directions of different molecules. In the liquid crystal layer, four liquid crystal domains are formed according to the combination of the two alignment regions of the first alignment film and the two alignment regions of the second alignment film, thereby improving the response speed and widening the viewing angle. Both are planned.

  However, as described in Patent Document 3, in a VA mode liquid crystal display device including an alignment film that defines a pretilt direction, a specific alignment disorder occurs and the luminance is lower than a halftone to be displayed in a front view. This area exists and dark lines occur. This dark line may occur not only in the central part of the adjacent pixel electrode in the liquid crystal domain region but also in at least a part of the edge part of the pixel electrode.

  If there is an edge portion of the edge of the pixel electrode corresponding to the liquid crystal domain, the azimuth angle direction orthogonal to the inside of the pixel electrode and the reference orientation direction of the liquid crystal domain forms an angle of more than 90 °, the dark line is It occurs substantially in parallel to the edge portion inside the edge portion of the electrode. In this specification, this dark line is also called a domain line. The domain lines are generated at different positions depending on the alignment processing direction of the alignment film. The reason why such a domain line is generated is that the liquid crystal domain has a component in which the reference alignment direction of the liquid crystal domain and the direction of the alignment regulating force due to the oblique electric field generated at the edge of the pixel electrode are opposed to each other. This is thought to be because the molecular orientation is disturbed. The dark line at the center of the pixel electrode is generated when the alignment direction of the liquid crystal molecules is different in the boundary region of the liquid crystal domain and does not transmit light. The dark line at the center of the pixel electrode is also called a disclination line.

The liquid crystal display device disclosed in Patent Document 3 includes a light shielding member that shields a region where dark lines are generated. Since the domain line generated at the edge portion appears to fluctuate depending on the viewing angle, gradation inversion occurs unless the edge portion is shielded from light. For this reason, the deterioration of the viewing angle characteristic is suppressed by shielding the edge portion. In addition, when an auxiliary capacitance wiring or the like is provided so as to overlap with the center of the pixel electrode, the central portion of the pixel electrode is shielded by using this to suppress a decrease in the aperture ratio.
JP-A-11-133429 JP 11-352486 A International Publication No. 2006/132369 Pamphlet

  In general, a liquid crystal display device is inspected after manufacture as to whether it is manufactured as designed. A VA mode liquid crystal display device including an alignment film that defines a pretilt direction is configured to shield a region where a dark line is generated, and an inspection is performed as to whether the dark line is shielded as designed after manufacture. Note that the dark line inspection is performed using an optical microscope with a resolution that is not so high.

  If the VA mode liquid crystal display device is not manufactured as designed, dark lines are abnormally generated, and dark lines that are not shielded by the light shielding structure are detected in the dark line inspection. Specifically, if the alignment process of the alignment film is different from the design for the alignment area of the alignment film or the alignment area of the alignment film is misaligned, the position is different from the dark line assumed in the design stage. Or dark lines of different thickness are generated.

  When such an abnormal dark line occurs, the aperture ratio decreases, and the liquid crystal display device becomes a defective product. In this case, in order to improve the yield of the liquid crystal display device, the cause of the occurrence of the dark line abnormality is clarified, and the abnormal dark line is similarly prevented from being generated in the liquid crystal display device manufactured later in the same manufacturing line. There is a need. However, even if the presence or absence of dark lines generated in the liquid crystal display device can be detected in the dark line inspection, it is not possible to specify the design dark line generation position. In order to specify the design position of the dark line, it is necessary to refer to design data or to confirm whether the alignment processing step actually performed in the manufacturing process of the liquid crystal display device is appropriate. For this reason, the design dark line shape cannot be specified easily, and it is difficult to improve the yield based on the dark line inspection of the liquid crystal display device. In addition, dark lines that are not shielded from light may be found when the display quality is confirmed except for the dark line inspection, but at this time, the position where the dark lines are generated cannot be easily specified.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a liquid crystal display device that facilitates improvement in yield.

  The liquid crystal display device according to the present invention includes a vertical alignment type liquid crystal layer having liquid crystal molecules, a back substrate having a first alignment film, and a second alignment film facing the first alignment film through the liquid crystal layer. A first liquid crystal display device comprising a front substrate, wherein the first alignment film is subjected to an alignment process in a first alignment process direction and defines a first pretilt direction of the liquid crystal molecules; An alignment process is performed in a second alignment process direction different from the alignment process direction, and the second alignment region defines a second pretilt direction of the liquid crystal molecules. The second alignment film has a third alignment process. A third alignment region that defines a third pretilt direction of the liquid crystal molecules and a fourth alignment treatment direction different from the third alignment treatment direction, and the fourth alignment of the liquid crystal molecules is performed. Fourth alignment area that defines the pretilt direction The back substrate further includes a pixel electrode, a thin film transistor having a gate electrode, a source electrode and a drain electrode, and a drain lead wiring electrically connected to the drain electrode, The drain lead wiring has a contact portion in contact with the pixel electrode, and the contact portion has a shape indicating at least one of the first alignment processing direction and the second alignment processing direction.

  In one embodiment, the shape of the contact portion is a notch shape.

  In one embodiment, a boundary line between the first alignment region and the second alignment region overlaps the contact portion, and the contact portion overlaps the first alignment region in the first alignment processing direction. Notched to show.

  In one embodiment, the contact portion is notched so as to indicate the second alignment treatment direction in a portion overlapping the second alignment region.

  In one embodiment, the contact portion of the drain lead wiring overlaps with the vicinity of the center of the pixel electrode.

  In one embodiment, the pixel electrode has a first subpixel electrode and a second subpixel electrode, and the contact portion of the drain lead-out wiring is the first subpixel electrode or the second subpixel electrode. It overlaps with the vicinity of the center of the pixel electrode.

  In one embodiment, the first alignment treatment direction and the second alignment treatment direction are antiparallel, and the third alignment treatment direction and the fourth alignment treatment direction are antiparallel.

  In one embodiment, an angle formed by the first or second alignment treatment direction and the third or fourth alignment treatment direction is 90 °.

  In one embodiment, the liquid crystal layer includes a first liquid crystal domain sandwiched between the first alignment region and the third alignment region, and a second liquid crystal sandwiched between the first alignment region and the fourth alignment region. A liquid crystal domain; a third liquid crystal domain sandwiched between the second alignment region and the fourth alignment region; and a fourth liquid crystal domain sandwiched between the second alignment region and the third alignment region. ing.

  In one embodiment, a part of each of the first, second, third, and fourth liquid crystal domains overlaps the contact portion.

  In one embodiment, the back substrate further includes a gate wiring and a source wiring electrically connected to the gate electrode and the source electrode of the thin film transistor, respectively, and an auxiliary capacitance wiring, and the auxiliary capacitance wiring A part is opposed to the contact portion through an insulating layer.

  ADVANTAGE OF THE INVENTION According to this invention, the liquid crystal display device which makes it easy to improve a yield can be provided.

  Hereinafter, embodiments of a liquid crystal display device according to the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments.

  FIG. 1 shows a schematic diagram of a liquid crystal display device 100 of the present embodiment. The liquid crystal display device 100 includes a rear substrate 200 having a first alignment film 270, a front substrate 300 having a second alignment film 320, and a vertical alignment type liquid crystal layer 400. The liquid crystal layer 400 is sandwiched between the first alignment film 270 of the back substrate 200 and the second alignment film 320 of the front substrate 300.

  The back substrate 200 is provided with matrix-like pixels along a plurality of rows and columns, and each pixel is provided with at least one switching element (for example, a thin film transistor). In this specification, “pixel” refers to a minimum unit that expresses a specific gradation in display, and corresponds to a unit that expresses each gradation of R, G, and B in color display, Also called a dot. A combination of the R pixel, the G pixel, and the B pixel constitutes one color display pixel. The “pixel region” refers to a region of the liquid crystal display device corresponding to the “pixel” of display. In the following description of this specification, the back substrate 200 is also referred to as an active matrix substrate, and the front substrate 300 is also referred to as a counter substrate.

  Although not shown, each of the active matrix substrate 200 and the counter substrate 300 is provided with a polarizing plate. Therefore, the two polarizing plates are arranged so as to face each other with the liquid crystal layer 400 interposed therebetween. The transmission axes (polarization axes) of the two polarizing plates are arranged so as to be orthogonal to each other, with one arranged along the horizontal direction (row direction) and the other along the vertical direction (column direction). Although not shown, the liquid crystal display device 100 may include a backlight as necessary.

  The first alignment film 270 and the second alignment film 320 are each processed so that the pretilt angle of the liquid crystal molecules is less than 90 ° with respect to the surface of the vertical alignment film. The pretilt angle is an angle formed between the main surfaces of the first alignment film 270 and the second alignment film 320 and the major axis of the liquid crystal molecules defined in the pretilt direction. The first alignment film 270 and the second alignment film 320 define the pretilt direction of the liquid crystal molecules, respectively. As a method of forming such an alignment film, a rubbing process, a photo-alignment process, a fine structure is formed in advance on the base of the alignment film, and the fine structure is reflected on the surface of the alignment film. A method or a method of forming an alignment film having a fine structure on the surface by obliquely depositing an inorganic substance such as SiO is known. However, from the viewpoint of mass productivity, rubbing treatment or photo-alignment treatment is preferable. In particular, since the photo-alignment process is performed without contact, there is no generation of static electricity due to friction as in the rubbing process, and the yield can be improved. Furthermore, as described in International Publication No. 2006/121220 pamphlet, the variation in the pretilt angle can be controlled to 1 ° or less by using a photo-alignment film containing a photosensitive group. The photosensitive group preferably contains at least one photosensitive group selected from the group consisting of a 4-chalcone group, a 4'-chalcone group, a coumarin group, and a cinnamoyl group.

  The liquid crystal layer 400 is a vertical alignment type and has liquid crystal molecules having negative dielectric anisotropy. Due to the first alignment film 270 and the second alignment film 320, liquid crystal molecules in the vicinity thereof are slightly inclined from the normal direction of the alignment film main surface. The pretilt angle is, for example, not less than 85 ° and less than 90 °. Note that here, the liquid crystal layer 400 does not have a chiral agent, and when a voltage is applied to the liquid crystal layer 400, the liquid crystal molecules in the liquid crystal layer 400 take twist alignment according to the alignment regulating force of the alignment films 270 and 320. However, a chiral agent may be added to the liquid crystal layer 400 as necessary. The liquid crystal layer 400 is combined with a polarizing plate arranged in a crossed Nicol manner to display a normally black mode.

  Hereinafter, the pretilt direction of the liquid crystal molecules defined in the first alignment film 270 and the second alignment film 320 and the alignment direction of the liquid crystal molecules in the center of each liquid crystal domain in one pixel will be described with reference to FIG. To do.

  2A shows the pretilt directions PA1 and PA2 of the liquid crystal molecules defined in the first alignment film 270 of the active matrix substrate 200, and FIG. 2B shows the second alignment of the counter substrate 300. The pretilt directions PB1 and PB2 of the liquid crystal molecules defined in the film 320 are shown. FIG. 2C shows the alignment direction of the liquid crystal molecules in the center of the liquid crystal domains A to D when a voltage is applied to the liquid crystal layer 400, and regions (domain lines) DL1 to DL4 that appear dark due to the alignment disorder. Yes. The domain lines DL1 to DL4 are not so-called disclination lines.

  2A to 2C schematically show the alignment direction of the liquid crystal molecules when viewed from the observer side. 2A to 2C show that the end (substantially circular portion) of the columnar liquid crystal molecules is tilted toward the observer, and FIGS. In 2 (c), the inclination of the liquid crystal molecules with respect to the normal direction of the main surfaces of the first and second alignment films 270 and 320 is slight (that is, the tilt angle is relatively large). As described above, the pretilt angle in FIGS. 2A and 2B is, for example, not less than 85 ° and less than 90 °.

  As shown in FIG. 2A, the first alignment film 270 has a first alignment region OR1 and a second alignment region OR2. The liquid crystal molecules defined in the first alignment region OR1 are inclined in the −y direction with respect to the normal direction of the main surface of the first alignment film 270, and are defined in the second alignment region OR2 of the first alignment film 270. The liquid crystal molecules are inclined in the + y direction with respect to the normal direction of the main surface of the first alignment film 270.

  Note that when the photo-alignment treatment is performed, the first alignment film 270 is irradiated with ultraviolet rays obliquely. Although not exactly equal in terms of angle, the liquid crystal molecules are tilted in the same direction as the direction of ultraviolet irradiation. Therefore, by obliquely irradiating ultraviolet rays from the direction indicated by the arrow, the liquid crystal molecules in the first alignment region OR1 of the first alignment film 270 are inclined in the −y direction with respect to the normal direction of the main surface, and the second alignment In the region OR2, the liquid crystal molecules are tilted in the + y direction with respect to the normal direction of the main surface. Note that the alignment film that has been subjected to the photo-alignment treatment is also referred to as a photo-alignment film.

  In addition, as shown in FIG. 2B, the second alignment film 320 has a third alignment region OR3 and a fourth alignment region OR4. The liquid crystal molecules defined in the third alignment region OR3 are inclined in the + x direction with respect to the normal direction of the main surface of the second alignment film 320, and the end portion of the liquid crystal molecules in the −x direction faces the front side. Yes. Further, the liquid crystal molecules defined in the fourth alignment region OR4 of the second alignment film 320 are inclined in the −x direction with respect to the normal direction of the main surface of the second alignment film 320, and the + x direction of the liquid crystal molecules is The end faces the front side.

  In addition, as described above, when the photo-alignment process is performed, the second alignment film 320 is irradiated with ultraviolet rays from an oblique direction. Although not exactly equal in terms of angle, the liquid crystal molecules tilt in the same direction as the direction of ultraviolet irradiation. For this reason, by obliquely irradiating ultraviolet rays from the direction indicated by the arrow, the liquid crystal molecules in the third alignment region OR3 of the second alignment film 320 are inclined in the + x direction with respect to the normal direction of the main surface, and the −x direction The end portion faces the front side, and in the fourth alignment region OR4, the liquid crystal molecules are tilted in the −x direction with respect to the normal direction of the main surface, and the end portion in the + x direction faces the front side.

  In the description of this specification, a direction in which an alignment process is performed on the alignment film is referred to as an alignment process direction. When a component obtained by projecting the traveling direction of light irradiated to the alignment film when performing the photo-alignment process onto the alignment film is called an exposure direction, the exposure direction is equal to the alignment process direction. The alignment treatment direction corresponds to an azimuth component obtained by projecting the direction toward the alignment region along the long axis of the liquid crystal molecules onto the alignment region. The alignment treatment directions of the first, second, third, and fourth alignment regions are also referred to as first, second, third, and fourth alignment treatment directions, respectively.

  The first alignment region OR1 of the first alignment film 270 is subjected to an alignment process in the first alignment process direction PD1, and the second alignment region OR2 is different from the first alignment process direction PD1 in a second alignment process. An orientation process is performed in the direction PD2. The first alignment treatment direction PD1 is substantially antiparallel to the second alignment treatment direction PD2. Further, the third alignment region OR3 of the second alignment film 320 is subjected to the alignment process in the third alignment process direction PD3, and the fourth alignment region OR4 is different from the third alignment process direction PD3. An alignment process is performed in the alignment process direction PD4. The third alignment treatment direction PD3 is substantially antiparallel to the fourth alignment treatment direction PD4.

  In the first alignment film 270, the boundary line between the first alignment region OR1 and the second alignment region OR2 extends in the column direction (y direction). In the second alignment film 320, the boundary line between the third alignment region OR3 and the fourth alignment region OR4 extends in the row direction (x direction). The angle formed between the first alignment treatment direction and the second alignment treatment direction and the third alignment treatment direction and the fourth alignment treatment direction is approximately 90 °.

  Further, here, the boundary lines of the first and second alignment regions OR1 and OR2 of the first alignment film 270 are substantially parallel to the alignment treatment direction of the first and second alignment regions OR1 and OR2, and the second alignment film The boundary line of the third and fourth alignment regions OR3 and OR4 of 320 is substantially parallel to the alignment treatment direction of the third and fourth alignment regions OR3 and OR4. When the alignment process is performed in this way, the width of the region where the pretilt direction cannot be controlled in the predetermined direction formed near the boundary line is minimized as compared with the case where the alignment process is performed in the direction orthogonal to the boundary line. can do.

  In addition, as described in the pamphlet of International Publication No. 2006/121220, it is preferable that the pretilt angles defined by the alignment films 270 and 320 are substantially equal to each other. Since the pretilt angles of the alignment films 270 and 320 are substantially equal, display luminance characteristics can be improved. In particular, when the difference in the pretilt angle defined by the alignment films 270 and 320 is within 1 °, the reference alignment direction of the liquid crystal molecules near the center of the liquid crystal layer 400 can be stably controlled, and the display luminance characteristics Can be improved. On the other hand, when the difference in the pretilt angle increases, the reference alignment direction varies depending on the position in the liquid crystal layer. As a result, a region having a transmittance lower than the desired transmittance is formed, and the transmittance varies.

  As shown in FIG. 2C, four liquid crystal domains A, B, C, and D are formed in the liquid crystal layer 400. In the liquid crystal layer 400, a portion sandwiched between the first alignment region OR 1 of the first alignment film 270 and the third alignment region OR 3 of the second alignment film 320 becomes the liquid crystal domain A, and the first alignment region of the first alignment film 270. The portion sandwiched between OR1 and the fourth alignment region OR4 of the second alignment film 320 becomes the liquid crystal domain B, and is sandwiched between the second alignment region OR2 of the first alignment film 270 and the fourth alignment region OR4 of the second alignment film 320. The portion sandwiched between the second alignment region OR2 of the first alignment film 270 and the third alignment region OR3 of the second alignment film 320 becomes the liquid crystal domain D.

  The alignment direction of the liquid crystal molecules at the center of the liquid crystal domains A to D is an intermediate direction between the pretilt direction of the liquid crystal molecules by the first alignment film 270 and the pretilt direction of the liquid crystal molecules by the second alignment film 320. In this specification, the orientation direction of liquid crystal molecules in the center of the liquid crystal domain, and the azimuth component in the direction from the back surface to the front surface along the major axis of the liquid crystal molecules is referred to as a reference alignment direction. The reference alignment direction characterizes the corresponding liquid crystal domain and has a dominant influence on the viewing angle dependence of each liquid crystal domain. Here, the horizontal direction (left-right direction) of the display screen (paper surface) is taken as a reference for the azimuth angle direction, and the counterclockwise direction is taken positively. The reference orientation directions of the four liquid crystal domains A to D are set so that the difference between any two directions is four directions substantially equal to an integral multiple of 90 °. Specifically, the azimuth angles of the liquid crystal domains A, B, C, and D are 225 °, 315 °, 45 °, and 135 °, respectively. As described above, since the symmetrical reference orientation direction is realized, the viewing angle characteristics are made uniform and a good display can be obtained. From the viewpoint of uniformity of viewing angle characteristics, it is preferable that the areas occupied by the four liquid crystal domains in the pixel region are substantially equal to each other. Specifically, the difference between the area of the largest liquid crystal domain and the area of the smallest liquid crystal domain among the four liquid crystal domains is preferably 25% or less of the largest area.

  Further, as shown in FIG. 2C, a domain line DL1 is generated in the liquid crystal domain A in parallel with the edge portion EG1, and a domain line DL2 is formed in the liquid crystal domain B in parallel with the edge portion EG2. The domain line DL3 is formed in parallel to the edge part EG3, and the domain line DL4 is formed in the liquid crystal domain D in parallel to the edge part EG4. The total length of the four domain lines DL1 to DL4 is about one half of the total length of the edge of the pixel electrode. The edge part EG1 (domain line DL1) and the edge part EG3 (domain line DL3) are parallel to the vertical direction, and the edge part EG2 (domain line DL2) and the edge part EG4 (domain line DL4) are parallel to the horizontal direction. . Further, a disclination line CL1 indicated by a broken line is observed in a boundary region where each of the liquid crystal domains A to D is adjacent to another liquid crystal domain. The disclination line CL1 is the dark line at the center described above.

  As shown in FIG. 2C, the disclination line CL1 and the domain lines DL1 to DL4 are continuously seen, and a reverse saddle-shaped dark line is generated. Here, as shown in FIG. 2 (c), the reference alignment direction of the liquid crystal molecules in the liquid crystal domains A to D is swiveled, as understood from FIGS. 2 (a) and 2 (b). In addition, the alignment treatment directions (exposure directions) PD1 to PD4 of the first alignment film 270 and the second alignment film 320 are not rotated.

  The liquid crystal molecules defined in the pretilt direction by the first alignment film 270 and the second alignment film 320 as shown in FIGS. 2A and 2B substantially change according to the applied voltage. It is not a thing. On the other hand, when the applied voltage of the liquid crystal molecules at the center of each liquid crystal domain as shown in FIG. 2C is larger than a predetermined value, the first alignment film 270 as shown in FIG. 2C. And when the applied voltage is lower than a predetermined value, it is almost the same as the normal direction of the main surfaces of the first alignment film 270 and the second alignment film 320. Arranged in parallel.

  Here, the configuration of the liquid crystal display device 100 of the present embodiment will be described in more detail. FIG. 3A is a schematic cross-sectional view of the counter substrate 300. 3B is a schematic cross-sectional view of the active matrix substrate 200, and FIG. 3C is a schematic plan view of the active matrix substrate 200. FIG. 3B is a cross section taken along line B-B ′ of FIG. FIG. 3D is a schematic plan view in which the contact portion 252 of the drain lead wiring 250 in the active matrix substrate 200 is enlarged.

  As shown in FIG. 3A, the counter substrate 300 further includes a transparent substrate 302 and a counter electrode 310. The second alignment film 320 is provided so as to cover the counter electrode 310. Although not shown here, the counter substrate 300 is provided with a black matrix as necessary.

  As shown in FIGS. 3B and 3C, the active matrix substrate 200 includes a transparent substrate 202, an auxiliary capacity wiring 210, a gate wiring 220, a first capacity covering the auxiliary capacity wiring 210 and the gate wiring 220. The insulating layer 225, the semiconductor layers 230 and 232 provided on the first insulating layer 225, the source wiring 240, the drain lead wiring 250, and the semiconductor layers 230 and 232, the source wiring 240 and the drain lead wiring 250 that cover the first And a pixel electrode 260 that fills the contact hole provided in the second insulating layer 235 and covers the second insulating layer 235. The first alignment film 270 is provided so as to cover the pixel electrode 260. A thin film transistor (TFT) 280 includes a gate electrode 221 electrically connected to the gate wiring 220, a semiconductor layer 232, a source electrode 241 electrically connected to the source wiring 240, and a drain lead wiring 250. And a drain electrode 251 electrically connected to each other. Note that the semiconductor layer 230 functions as a so-called etching stopper. The semiconductor layer 230 is provided corresponding to the contact hole of the second insulating layer 235. When the contact hole is formed in the second insulating layer 235 by etching, at least the first insulating layer 225 below the semiconductor layer 230 is formed. Are suppressed from being etched and a short circuit between the auxiliary capacitance wiring 210 and the pixel electrode 260 is prevented.

  The contact hole of the second insulating layer 235 is formed so as to expose a part of the contact portion 252 of the drain lead wiring 250, and the pixel electrode 260 filled in the contact hole of the second insulating layer 235 is a drain lead wiring. 250.

  The auxiliary capacitance line 210 extends in the x direction and has a cross shape near the center of the pixel electrode 260. The auxiliary capacitance line 210 faces the contact portion 252 with the first insulating layer 225 interposed therebetween.

  The drain lead wiring 250 extends from the drain electrode 251 and has a cross shape near the center of the pixel electrode 260. The length and width of the contact portion 252 of the drain lead wiring 250 are larger than other portions of the drain lead wiring 250.

  The contact portion 252 of the drain lead wiring 250 is disposed so as to overlap the center of the pixel electrode 260 and does not overlap the gate wiring 220, the source wiring 240, and the black matrix (not shown). The auxiliary capacitance wiring 210, the gate wiring 220, and the source wiring 240 are linear, and the pixel electrode 260 is substantially rectangular except for the portion where the TFT 280 is provided.

  The first alignment treatment direction PD1 of the first alignment region OR1 of the first alignment film 270 is the + y direction, and the second alignment treatment direction PD2 of the second alignment region OR2 is the -y direction. The third alignment treatment direction PD3 of the third alignment region OR3 of the second alignment film 320 is the −x direction, and the fourth alignment treatment direction PD4 of the fourth alignment region OR4 is the + x direction. The contact portion 252 of the drain lead wiring 250 is provided in the vicinity of the center of the four liquid crystal domains so as to overlap each of the liquid crystal domains A to D, and overlaps the second alignment region OR2 of the first alignment film 270. A notch 254 indicating the second alignment processing direction PD2 is provided at the position. Note that the size of the contact portion 252 is, for example, 30 to 40 μm, and here, 33 μm. Among them, the size of the notch 254 is, for example, 5 to 10 μm, and here is 8 μm. Since the contact part 252 is arranged in the center of the pixel region, the notch part 254 of the contact part 252 is visually recognized in the dark line inspection. The notch portion 254 of the contact portion 252 is a design orientation processing direction (here, a −y direction indicating a −y direction) in the orientation region (here, the second orientation region OR2) of the first orientation film 270 overlapping the notch portion 254. Since the alignment treatment direction PD2) is provided, the alignment treatment direction of the first alignment film 270 can be specified only by looking at the notch 254 of the contact portion 252.

  The liquid crystal display device 100 is designed to shield at least a position where a domain line is generated. For example, at least part of the edge portion of the pixel electrode 260 overlaps with the gate wiring 220, the source wiring 240, and a black matrix (not shown). Therefore, if the liquid crystal display device 100 is ideally manufactured as designed, dark lines are not detected in the dark line inspection. However, if the liquid crystal display device 100 is not manufactured as designed, dark lines are abnormally generated, and dark lines are observed in the dark line inspection.

  In the liquid crystal display device 100, the alignment treatment direction of the first alignment film 270 can be specified only by looking at the notch 254 of the contact portion 252, and the dark line design generation position can be specified. For this reason, the cause of the occurrence of the dark line abnormality can be assumed by comparing the actual dark line and the design dark line position. If the actual dark line is generated at a position different from the design, it is assumed that the alignment region of the alignment film is formed by mistake. In addition, although the actual dark line is generated at the same position as the designed dark line, if the dark line is still detected, the dark line is generated abnormally thick, and the alignment between the first alignment region and the second alignment region is performed. Is assumed to be off.

  Here, a manufacturing method of the liquid crystal display device 100 of the present embodiment will be described.

  First, a transparent substrate 202 is prepared. The transparent substrate 202 is a glass substrate, for example. A storage layer 210 and a gate wiring 220 are formed by depositing a conductive layer on the transparent substrate 202 and patterning the conductive layer into a predetermined pattern.

  Next, a first insulating layer 225 that covers the storage capacitor wiring 210 and the gate wiring 220 is formed. A semiconductor layer is deposited on the first insulating layer 225 and patterned into a predetermined pattern, thereby forming the semiconductor layer 230 in the contact region and the semiconductor layer 232 in the TFT region.

  A conductive layer is deposited so as to cover the semiconductor layers 230 and 232 and is patterned to form the source wiring 240 and the drain lead wiring 250. Next, an insulating material is deposited so as to cover the source wiring 240 and the drain lead wiring 250, and a part of the contact region is removed by etching, thereby forming a second insulating layer 235 having a contact hole. A pixel electrode 260 is formed on the second insulating layer 235.

  A first alignment film 270 is formed to cover the pixel electrode 260. The first alignment film 270 is formed by, for example, a photo-alignment process. WO 2007/063727 discloses a method for producing an alignment film by photo-alignment treatment. In this specification, the content disclosed in International Publication No. 2007/063727 is incorporated by reference.

  A light source (not shown) arranged to irradiate the first alignment film 270 with ultraviolet rays from the first alignment processing direction PD1, and a photomask (not shown) having an opening corresponding to the first alignment region OR1. ) In the y direction (for example, + y direction) relative to the first alignment film 270, the first alignment region OR1 is formed for the pixel regions arranged in the column direction. The exposure is performed using, for example, ultraviolet rays having a wavelength of 350 nm or less.

  Next, a light source (not shown) arranged to irradiate the first alignment film 270 with ultraviolet rays from the second alignment processing direction PD2, and a photomask having an opening corresponding to the second alignment region OR2. (Not shown) is scanned in the y direction (for example, −y direction) relative to the first alignment film 270 to form the second alignment region OR2 for the pixel regions arranged in the column direction. Is done. The active matrix substrate 200 is manufactured as described above.

  In addition, a transparent substrate 302 is prepared. A counter electrode 310 is formed on the transparent substrate 302. Next, a second alignment film 320 is formed on the counter electrode 310. When the second alignment film 320 is formed by a photo-alignment process, it is performed in the same manner as the first alignment film 270. The counter substrate 300 is manufactured as described above.

  Next, the active matrix substrate 200 and the counter substrate 300 are aligned and bonded, and liquid crystal molecules are injected therebetween, whereby the liquid crystal layer 400 is formed. As described above, the liquid crystal display device 100 is manufactured. Here, the manufacturing process of one liquid crystal display device 100 has been described, but actually, a plurality of liquid crystal display devices are continuously manufactured in the same manufacturing line.

  Thereafter, the manufactured liquid crystal display device 100 is inspected. In the same way as a general inspection method, while inputting a signal using a lighting jig, inspection for display quality such as continuity inspection and display unevenness and dark line inspection are performed. In the dark line inspection, the light transmittance is confirmed by the amount of transmitted light, and a visual inspection is performed using a microscope. At this time, when an obvious dark line is detected, it is confirmed whether or not the dark line is generated in the same shape as the design shape.

  For example, when the alignment film is formed by the photo-alignment process, the dark line abnormality occurs due to an error in the exposure direction or a misalignment of the photomask. When exposure is performed from an exposure direction different from the design, an alignment region having an alignment process direction different from the design is formed. Further, as described above, in the photo-alignment process, the alignment region is formed by irradiating the first alignment film 270 with the light that has passed through the opening of the photomask, but if the alignment of the photomask is shifted, dark lines are formed. Is thicker than the design.

  In the liquid crystal display device 100 of the present embodiment, the contact portion 252 of the drain lead wiring 250 is provided with a notch 254 indicating the second alignment processing direction PD2 in a portion overlapping the second alignment region OR2 of the first alignment film 270. Therefore, the notch portion 254 of the contact portion 252 can be visually recognized in the dark line inspection, and the design orientation processing direction of the first alignment film 270 is specified. For this reason, when the dark line is abnormally generated, the design position of the dark line can be specified by specifying the design alignment processing direction of the first alignment film 270. By comparing the position of the actual dark line and the design dark line, the reason why the dark line is abnormally generated is due to an error in the orientation processing direction or due to misalignment of the photomask. Can be assumed, and can be fed back to the alignment process of the same production line. As described above, in the liquid crystal display device 100, the design alignment direction of the first alignment film 270 can be specified, so that the cause of the dark line abnormality can be easily clarified. By feeding back to the alignment process, the yield can be easily improved. In the inspection process, it is important to extract a phenomenon that has occurred and to estimate the cause of the phenomenon. As described above, the cause of the defect can be identified earlier by identifying the design orientation processing direction based on the shape of the contact portion in the visual inspection.

  In the above description, the alignment treatment direction of the alignment film has been described with reference to FIG. 2, but the alignment treatment direction of the alignment film in the liquid crystal display device of the present invention is not limited to this.

  As shown in FIG. 4, the first alignment treatment direction PD1 of the first alignment region OR1 of the first alignment film 270 is the + y direction, and the second alignment treatment direction PD2 of the second alignment region OR2 is the -y direction. The third alignment treatment direction PD3 of the third alignment region OR3 of the second alignment film 320 is the + x direction, and the fourth alignment treatment direction PD4 of the fourth alignment region OR4 is the -x direction. In this case, the domain line DL2 of the liquid crystal domain B is generated continuously in the horizontal direction and the vertical direction, and the domain line DL4 of the liquid crystal domain D is generated continuously in the horizontal direction and the vertical direction.

  In the alignment treatment direction shown in FIG. 4, the domain lines are formed in two liquid crystal domains, whereas in the alignment treatment direction shown in FIG. 2, the reference alignment directions of the liquid crystal molecules in the four liquid crystal domains. Since a single domain line is formed in each liquid crystal domain, it is easy to make viewing angle characteristics uniform. For this reason, as shown in FIG. 2, it is preferable that the reference alignment direction of the liquid crystal molecules in the center of each liquid crystal domain is swiveled.

  In the above description, the contact portion 252 of the drain lead wiring 250 has the notch portion 254 that indicates the orientation processing direction in the −y direction, but the present invention is not limited to this. The cutout portion 254 of the contact portion 252 may indicate the alignment processing direction in the + y direction.

  As shown in FIGS. 5 and 6, the first alignment treatment direction PD1 of the first alignment region OR1 of the first alignment film 270 is the −y direction, and the second alignment treatment direction PD2 of the second alignment region OR2 is the + y direction. It is. The third alignment treatment direction PD3 of the third alignment region OR3 of the second alignment film 320 is the + x direction, and the fourth alignment treatment direction PD4 of the fourth alignment region OR4 is the -x direction. In this case, the dark lines including the domain lines DL to 1DL4 and the disclination line CL1 are formed in a bowl shape.

  The contact part 252 of the drain lead wiring 250 is provided in the vicinity of the center of the four liquid crystal domains so as to overlap each part of the liquid crystal domains A to D, and the second alignment region OR2 side of the first alignment film 270. Has a notch 254 indicating the second alignment processing direction PD2. The cutout portion 254 of the contact portion 252 is a second alignment orientation indicating a + y direction in the design in the alignment region (here, the second alignment region OR2) of the first alignment film 270 that overlaps the cutout portion 254. Since it is provided so as to indicate the processing direction PD2), the design orientation direction of the first alignment film 270 can be specified only by looking at the notch 254 of the contact portion 252.

  Alternatively, as illustrated in FIG. 7, the first alignment treatment direction PD1 of the first alignment region OR1 of the first alignment film 270 is the −y direction, and the second alignment treatment direction PD2 of the second alignment region OR2 is the + y direction. is there. The third alignment treatment direction PD3 of the third alignment region OR3 of the second alignment film 320 is the −x direction, and the fourth alignment treatment direction PD4 of the fourth alignment region OR4 is the + x direction. In this case, the domain line DL1 of the liquid crystal domain A is continuously generated in the horizontal direction and the vertical direction, and the domain line DL3 of liquid crystal domain C is continuously generated in the horizontal direction and the vertical direction.

  In the above description, the contact portion 252 of the drain lead wiring 250 has the notch portion 254 indicating the second alignment processing direction PD2 of the second alignment region OR2 of the first alignment film 270. It is not limited to this. The contact portion 252 may have a cutout portion that indicates the first alignment treatment direction PD1 of the first alignment region OR1 of the first alignment film 270.

  In the above description, the contact portion 252 is provided with one notch 254, but the present invention is not limited to this.

  As shown in FIG. 8, the contact portion 252 of the drain lead wiring 250 includes a first notch 254 indicating the first alignment treatment direction PD1 of the first alignment region OR1, and a second alignment treatment direction PD2 of the second alignment region OR2. 2nd notch part 256 which shows. The first notch 254 is provided at a position overlapping the first alignment region OR1 of the first alignment film 270, and the second notch 256 is provided at a position overlapping the second alignment region OR2 of the first alignment film 270. It has been. Thus, the contact part 252 may have the notch parts 254 and 256 which show the orientation process direction of both two orientation area | regions OR1 and OR2. Since the first alignment treatment direction PD1 is substantially antiparallel to the second alignment treatment direction PD2, the first notch 254 of the contact portion 252 is at a diagonal position with respect to the second notch 256.

  One pixel may have two subpixels. A structure in which one pixel has two sub-pixels is also called a multi-pixel structure, and the advantages of the multi-pixel structure are described in, for example, Japanese Patent Application Laid-Open No. 2004-62146. In the specification of the present application, the disclosure of Japanese Patent Application Laid-Open No. 2004-62146 is incorporated for reference.

  As shown in FIG. 9, one pixel has a first subpixel SPA and a second subpixel SPB. The subpixel electrodes 260A and 260B are connected to the drain lead wirings 250A and 250B, respectively, and are connected to the source wiring 240, the gate wiring 220, and the auxiliary capacitance wiring 210 via an interlayer insulating film (not shown) made of a resin layer. It arranges so that a part may overlap. The contact portions 252A and 252B of the drain lead wires 250A and 250B are arranged so as to overlap with the vicinity of the center of the subpixel electrodes 260A and 260B. In addition, the central portions of the subpixel electrodes 260A and 260B are constituted by drain lead wires 250A and 250B, lead wires 212A and 212B of the auxiliary capacitor wires 210A and 210B, and an insulating layer (for example, a gate insulating layer) therebetween. An auxiliary capacity is formed.

  The subpixel electrodes 260A and 260B are connected to the common source line 240 via the corresponding TFTs 280A and 280B, respectively. The two TFTs 280A and 280B are ON / OFF controlled by a common gate wiring 220. Each of the sub-pixel electrodes 260A and 260B constitutes a liquid crystal capacitance by the liquid crystal layer 400 and a counter electrode (not shown in FIG. 9) facing the liquid crystal layer 400 with the liquid crystal layer 400 interposed therebetween. Auxiliary capacitors are formed in electrical parallel to the liquid crystal capacitors corresponding to the sub-pixel electrodes 260A and 260B, respectively. One electrode (auxiliary capacitance electrode) constituting the auxiliary capacitance is constituted by the contact portion 252 of the drain lead wiring 250 connected to the drain electrode 251 of the same TFT as the subpixel electrode, and the other electrode (auxiliary capacitance counter electrode). Is composed of lead-out wirings 212A and 212B of auxiliary capacitance wirings provided electrically independently for the two sub-pixel electrodes.

  The auxiliary capacitor counter voltage supplied from the auxiliary capacitor line to the auxiliary capacitor belonging to one subpixel rises after the TFT is turned off, for example, and is supplied from the auxiliary capacitor line to the auxiliary capacitor belonging to the other subpixel. The effective voltage applied to the liquid crystal layers of the two sub-pixels varies as the storage capacitor counter voltage drops after the TFT is turned off, so that the display signal voltage supplied from the source wiring is different. It exhibits two different luminances (one is high luminance and the other is low luminance), and the viewing angle dependence of the γ characteristic can be improved. Note that when a multi-pixel structure is employed as shown in FIG. 9, two sub-pixels in one pixel are arranged substantially symmetrically with respect to the X axis, so that the structure in the pixel (for example, drain extraction) If the orientation processing direction is determined on the basis of the positional relationship between the wiring and the semiconductor layer, confusion occurs during the inspection. However, by providing a notch shape in the contact portion, a mark is arranged in a uniform direction in any subpixel. Can avoid such confusion.

  Further, as shown in FIG. 10, the contact part 252A of the drain lead wiring 250A in the first subpixel SPA has a first notch part 254A and a second notch part 256A, and in the second subpixel SPB. The contact part 252B of the drain lead wiring 250B may have a first notch part 254B and a second notch part 256B. The first cutout portion 254A of the contact portion 252A and the first cutout portion 254B of the contact portion 252B are both provided at a position indicating the first alignment treatment direction PD1 of the first alignment region OR1 of the first alignment film 270. Further, the second cutout portion 256A of the contact portion 252A and the second cutout portion 256B of the contact portion 252B are both provided at positions indicating the second alignment treatment direction PD2 of the second alignment region OR2 of the first alignment film 270. . For this reason, the first cutout portions 254A and 254B are formed in the same direction, and the second cutout portions 256A and 256B are formed in the same direction.

  In the above description, the wiring is provided in a straight line, but the present invention is not limited to this. As disclosed in Patent Document 3, the auxiliary capacitance wiring, the gate wiring, the source wiring, the drain leading wiring, and the pixel electrode have a bent shape or a variable width, so that an edge portion of the pixel electrode is obtained. May be shielded from light.

  For example, as shown in FIG. 11, the source wiring 240 is bent so as to shield the edge portion where the domain line is generated, and the edges of the pixel electrodes 260A and 260B are overlapped with the auxiliary capacitance wiring and the gate wiring. You may have. Note that with such a configuration, the orientation processing direction in design can be specified. However, for example, when the wiring has a bent shape or a variable width, the wiring is particularly broken when the wiring is thin. Cheap. Further, if the wiring has a bent shape, the potential of the pixel electrodes 260A and 260B is affected, and as a result, the orientation of the liquid crystal molecules is affected. Further, the drain lead wirings 250A and 250B have a bent shape. The longer the drain lead wirings 250A and 250B and the larger the area, the lower the contrast due to surface reflection. On the other hand, in the liquid crystal display device of the present embodiment, the design alignment processing direction can be easily specified even if the wiring has a linear configuration.

  In the liquid crystal display device according to the present embodiment as well, the dark lines may be shielded independently, or the dark lines may be shielded integrally as in the liquid crystal display device disclosed in Patent Document 3.

  In the above description, the photo-alignment process is performed by irradiating light from the direction inclined in the vertical direction (column direction) with respect to the first alignment film 270 of the active matrix substrate 200, and the second alignment of the counter substrate 300. Although light irradiation is performed from a direction inclined in the lateral direction (row direction) with respect to the film 320, the present invention is not limited to this. Light may be irradiated from a direction inclined in the horizontal direction (row direction) with respect to the first alignment film 270 of the active matrix substrate 200, and the vertical direction (column) with respect to the second alignment film 320 of the counter substrate 300. The light irradiation may be performed from a direction inclined in the direction).

  In the above description, four orientation divisions are performed, but the present invention is not limited to this. As long as different alignment treatments are performed on the back substrate, the number of alignment divisions may be other than four.

  In the above description, the TFT type liquid crystal display device has been described, but the present invention is not limited to this. The present invention may be a liquid crystal display device of another driving method.

  According to the liquid crystal display device of the present invention, it is possible to easily specify the generation position of the dark line in the design. This makes it possible to easily improve the yield of a liquid crystal display device that has good viewing angle characteristics and can be driven at high speed.

It is a schematic diagram which shows embodiment of the liquid crystal display device by this invention. (A) is a schematic diagram which shows the liquid crystal molecule prescribed | regulated to the 1st alignment film in the liquid crystal display device of this embodiment, (b) is a schematic diagram which shows the liquid crystal molecule prescribed | regulated to the 2nd alignment film, (C) is a schematic diagram showing a liquid crystal molecule at the center of each liquid crystal domain. (A) is typical sectional drawing of the counter substrate in the liquid crystal display device of this embodiment, (b) is typical sectional drawing of the active matrix substrate in the liquid crystal display device of this embodiment, (c) FIG. 4 is a schematic plan view of an active matrix substrate, and FIG. 4D is a schematic plan view in which a contact portion of a drain lead wiring in the active matrix substrate is enlarged. (A) is a schematic diagram which shows the liquid crystal molecule prescribed | regulated to the 1st alignment film in the modification of the liquid crystal display device of this embodiment, (b) is a schematic diagram which shows the liquid crystal molecule prescribed | regulated to the 2nd alignment film. (C) is a schematic diagram showing a liquid crystal molecule at the center of each liquid crystal domain. (A) is a schematic diagram which shows the liquid crystal molecule prescribed | regulated to the 1st alignment film in the modification of the liquid crystal display device of this embodiment, (b) is a schematic diagram which shows the liquid crystal molecule prescribed | regulated to the 2nd alignment film. (C) is a schematic diagram showing a liquid crystal molecule at the center of each liquid crystal domain. FIG. 6 is an enlarged schematic plan view of a contact portion of a drain lead wiring in the active matrix substrate of the liquid crystal display device shown in FIG. 5. (A) is a schematic diagram which shows the liquid crystal molecule prescribed | regulated to the 1st alignment film in the modification of the liquid crystal display device of this embodiment, (b) is a schematic diagram which shows the liquid crystal molecule prescribed | regulated to the 2nd alignment film. (C) is a schematic diagram showing a liquid crystal molecule at the center of each liquid crystal domain. It is the typical top view to which the contact part of the drain extraction wiring of the active matrix substrate in the modification of the liquid crystal display device of this embodiment was expanded. It is a typical top view which shows the modification of the liquid crystal display device of this embodiment. It is a typical top view which shows the modification of the liquid crystal display device of this embodiment. It is a typical top view which shows the modification of the liquid crystal display device of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Liquid crystal display device 200 Back substrate, active matrix substrate 202 Transparent substrate 210 Auxiliary capacity wiring 220 Gate wiring 221 Gate electrode 225 First insulating layer 230 Semiconductor layer 232 Semiconductor layer 235 Second insulating layer 240 Source wiring 241 Source electrode 250 Drain extraction wiring 251 Drain electrode 252 Contact portion 254 Notch portion 260 Pixel electrode 270 First alignment film 280 TFT
300 Front substrate, counter substrate 302 transparent substrate 310 counter electrode 320 second alignment film 400 liquid crystal layer

Claims (11)

A liquid crystal display device comprising: a vertical alignment type liquid crystal layer having liquid crystal molecules; a back substrate having a first alignment film; and a front substrate having a second alignment film facing the first alignment film through the liquid crystal layer. Because
The first alignment film is aligned in a first alignment process direction, a first alignment region defining a first pretilt direction of the liquid crystal molecules, and a second alignment process direction different from the first alignment process direction. A second alignment region that is subjected to an alignment treatment and defines a second pretilt direction of the liquid crystal molecules,
The second alignment film is aligned in a third alignment process direction and has a third alignment region that defines a third pretilt direction of the liquid crystal molecules, and a fourth alignment process direction different from the third alignment process direction. An alignment treatment is performed and has a fourth alignment region that defines a fourth pretilt direction of the liquid crystal molecules,
The back substrate is
A pixel electrode;
A thin film transistor having a gate electrode, a source electrode and a drain electrode;
A drain lead wiring electrically connected to the drain electrode;
The drain lead wiring has a contact portion in contact with the pixel electrode,
The liquid crystal display device, wherein the contact portion has a shape showing at least one of the first alignment treatment direction and the second alignment treatment direction.   The liquid crystal display device according to claim 1, wherein a shape of the contact portion is a notch shape. A boundary line between the first alignment region and the second alignment region overlaps with the contact portion,
The liquid crystal display device according to claim 2, wherein the contact portion is cut out so as to indicate the first alignment treatment direction in a portion overlapping with the first alignment region.   4. The liquid crystal display device according to claim 2, wherein the contact portion is cut out so as to indicate the second alignment treatment direction in a portion overlapping with the second alignment region. 5.   5. The liquid crystal display device according to claim 1, wherein the contact portion of the drain lead wiring overlaps with a vicinity of a center of the pixel electrode. The pixel electrode has a first subpixel electrode and a second subpixel electrode,
5. The liquid crystal display device according to claim 1, wherein the contact portion of the drain lead wiring overlaps with a vicinity of a center of the first subpixel electrode or the second subpixel electrode. The first alignment treatment direction and the second alignment treatment direction are antiparallel,
The liquid crystal display device according to claim 1, wherein the third alignment treatment direction and the fourth alignment treatment direction are antiparallel.   The liquid crystal display device according to claim 7, wherein an angle formed by the first or second alignment treatment direction and the third or fourth alignment treatment direction is 90 °. The liquid crystal layer is
A first liquid crystal domain sandwiched between the first alignment region and the third alignment region;
A second liquid crystal domain sandwiched between the first alignment region and the fourth alignment region;
A third liquid crystal domain sandwiched between the second alignment region and the fourth alignment region;
The liquid crystal display device according to claim 1, further comprising a fourth liquid crystal domain sandwiched between the second alignment region and the third alignment region.   The liquid crystal display device according to claim 9, wherein a part of each of the first, second, third, and fourth liquid crystal domains overlaps with the contact portion. The back substrate includes a gate wiring and a source wiring electrically connected to the gate electrode and the source electrode of the thin film transistor, respectively;
And further having auxiliary capacity wiring,
11. The liquid crystal display device according to claim 1, wherein a part of the auxiliary capacitance line is opposed to the contact portion through an insulating layer.

Images