JP2014048360A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a wide viewing angle and to restrict a decrease in the numeral aperture of a pixel, in a liquid crystal display device according to the invention.SOLUTION: In a liquid crystal display device 1, a first region a1 of a first signal electrode 228a is provided with a plurality of first slits S1 arranged along Y direction and extending in a first direction inclining to X direction, the second region a2 of the first signal electrode 228a is provided with a plurality of second slits S2 arranged in Y direction and extending in a second direction different from the first direction, and the fourth region a4 of the second signal electrode 228b is provided with a plurality of third slits S3 arranged in Y direction and extending in the second direction.

Description

  The present invention relates to a liquid crystal display device used for various applications such as a mobile phone, a digital camera, a portable game machine, or a portable information terminal.

  The liquid crystal display device includes a pair of substrates disposed to face each other and a liquid crystal layer provided between the pair of substrates. In addition, a plurality of gate wirings and a plurality of source wirings are provided on one of the pair of substrates so as to cross each other, and a planarization film is formed so as to cover the plurality of gate wirings and the plurality of source wirings. Is provided. In addition, a common electrode is provided on the planarization film and surrounded by a plurality of gate wirings and a plurality of source wirings, and a signal electrode is provided on the common electrode through an insulating film. (For example, refer to Patent Document 1). The signal electrode is formed with a plurality of slits which are arranged in the long side direction of the signal electrode and extend while being inclined with respect to the short side direction of the signal electrode.

  In such a liquid crystal display device, an electric field passing through the slit is generated between the signal electrode and the common electrode by applying a voltage to the signal electrode and the common electrode provided on one substrate, and this electric field A wide viewing angle is realized by controlling the orientation of the liquid crystal molecules in the liquid crystal layer.

  In recent years, a wider viewing angle has been demanded for liquid crystal display devices. On the other hand, a plurality of first slits S1 and a plurality of second slits S2 extending in different directions with respect to the signal electrode 228 in the pixel P are formed as in the liquid crystal display device shown in FIG. In the region where the first slit S1 is formed and the region where the plurality of second slits S2 are formed, the orientation of the liquid crystal molecules at the time of applying an electric field is changed to realize a wider viewing angle.

JP 2007-226175 A

  However, when the signal electrode 228 is formed close to the gate wiring 221 and the source wiring 223 as in the liquid crystal display device shown in FIG. 8, the signal electrode 228 has a rectangular shape. When a plurality of first slits S1 and second slits S2 arranged in the (Y direction) and inclined with respect to the short side direction (X direction) are to be formed in the signal electrode 228, end portions of the signal electrode 228 in the Y direction There is a region D where the slit S is difficult to be formed. When the first slit S1 and the second slit S2 are not formed and the area of the electrode portion in the region D is increased, the aperture ratio of the pixel is lowered at this portion, and the light transmittance is easily lowered. There was a problem.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a liquid crystal display device that realizes a wide viewing angle and suppresses a decrease in the aperture ratio of pixels.

The liquid crystal display device according to the present invention includes a first substrate and a second substrate that are disposed with their main surfaces facing each other, a liquid crystal layer that is disposed between the first substrate and the second substrate, and the second substrate. Linear first gate wiring, second gate wiring, and third gate wiring sequentially arranged on the main surface of the substrate in the Y direction, and orthogonal to the Y direction on the main surface of the second substrate Linearly arranged first source wiring and second source wiring that intersect with the first gate wiring to third gate wiring, and arranged in order in the X direction, and the first gate wiring to third gate wiring, A first insulating film provided on the main surface of the second substrate so as to cover the first source wiring and the second source wiring; a common electrode provided on the first insulating film; A first signal adjacent to the Y direction provided on the common electrode via an insulating film And the first signal electrode is located in a first region surrounded by the first gate wiring, the second gate wiring, the first source wiring, and the second source wiring. The first part overlaps with the second gate line, the second part located in the second region surrounded by the second gate line, the third gate line, the first source line and the second source line. The second part is connected to the second part, and the second signal electrode is provided in the second region, and the third part is connected to the second part. A plurality of first portions extending in a first direction inclined with respect to the X direction, arranged along the Y direction, in the first portion of the first signal electrode. A first slit and a first slit. The second part of the second signal electrode is provided with a plurality of second slits arranged in the Y direction and extending in a second direction different from the first direction, and the fourth part of the second signal electrode. Is provided with a plurality of third slits arranged in the Y direction and extending in the second direction.

  According to the liquid crystal display device of the present invention, it is possible to realize a wide viewing angle and to suppress a decrease in the aperture ratio of the pixel.

It is a top view which shows the liquid crystal display device in the 1st Embodiment of this invention. It is sectional drawing along the II line | wire of FIG. It is a top view which shows the wiring on the 2nd board | substrate, an electrode, and a thin-film transistor. It is sectional drawing along the II-II line of FIG. It is a top view which shows the principal part of the liquid crystal display device in the 2nd Embodiment of this invention. It is a top view which shows the principal part of the liquid crystal display device in the 3rd Embodiment of this invention. It is sectional drawing along the III-III line of FIG. It is a top view which shows the conventional liquid crystal display device.

[First Embodiment]
A liquid crystal display device 1 according to a first embodiment of the present invention will be described with reference to FIGS.

  The liquid crystal display device 1 includes a liquid crystal panel 2, a light source device 3 that emits light toward the liquid crystal panel 2, a first polarizing plate 4 disposed on the liquid crystal panel 2, and the liquid crystal panel 2 and the light source device 3. And a second polarizing plate 5 disposed therebetween.

  In the liquid crystal panel 2, the first substrate 21 and the second substrate 22 are disposed to face each other, and a liquid crystal layer 23 is provided between the first substrate 21 and the second substrate 22, so as to surround the liquid crystal layer 23. In addition, a sealing material 24 for joining the first substrate 21 and the second substrate 22 is provided.

  The first substrate 21 has a first main surface 21a used as a display surface when displaying an image, and a second main surface 21b located on the opposite side of the first main surface 21a. The first substrate 21 is formed of a light-transmitting material such as glass or plastic.

  A light shielding film 211 and a color filter 212 are provided on the second main surface 21 b of the first substrate 21.

  The light shielding film 211 has a function of shielding light. The light shielding film 211 is provided on the second main surface 21 b of the first substrate 21. Also. The light shielding film 211 is provided in a lattice shape along the outer periphery of the pixel P, that is, is provided so as to overlap the gate wiring 221 and the source wiring 223 in plan view. Although the light shielding film 211 in the present embodiment is formed in a lattice shape on the second main surface 21b, the present invention is not limited to this. Examples of the material of the light shielding film 211 include a resin to which a dye or pigment having a high light shielding property (for example, black) is added, or a metal such as chromium.

  The color filter 212 has a function of transmitting only a specific wavelength of visible light. The plurality of color filters 212 are located on the second main surface 21 b of the first substrate 21 and are provided for each pixel P. Each color filter 212 has one of red (R), green (G), and blue (B). Further, the color filter 212 is not limited to the above color, and may have a color such as yellow (Y) or white (W), for example. Examples of the material of the color filter 212 include a resin to which a dye or a pigment is added.

  The second substrate 22 has a first main surface 22a facing the second main surface 21b of the first substrate 21, and a second main surface 22b located on the opposite side of the first main surface 22a. The second substrate 22 can be formed of the same material as the first substrate 21.

  A plurality of gate wirings 221 are provided on the first main surface 22 a of the second substrate 22, and a gate insulating film 222 is provided so as to cover the plurality of gate wirings 221. A plurality of source wirings 223 are provided on the gate insulating film 222, and a first interlayer insulating film 224 is provided so as to cover the plurality of source wirings 223. A planarizing film 225 is provided on the first interlayer insulating film 224. A common electrode 226 is provided on the planarizing film 225. A second interlayer insulating film 227 is provided on the planarizing film 225 so as to cover the common electrode 226, and a plurality of signal electrodes 228 are provided on the second interlayer insulating film 227.

  The gate wiring 221 has a function of applying a voltage supplied from a driving IC (not shown) to the thin film transistor TFT. As shown in FIG. 3, the plurality of gate wirings 221 are arranged along the Y direction. The gate wiring 221 is linear and extends along the X direction. Further, the gate wiring 221 extends so as to pass through the central portion of the signal electrode 228 in the Y direction.

  In FIG. 3, three gate wirings 221 are shown. For convenience of explanation, these are referred to as a first gate wiring 221a, a second gate wiring 221b, and a third gate wiring 221c (the same applies to FIGS. 5 and 6).

  The gate wiring 221 is formed of a conductive material, for example, aluminum, molybdenum, titanium, neodymium, chromium, copper, or an alloy containing these.

  The gate wiring 221 is formed by the following method, for example.

  First, a metal material is formed as a metal film on the first main surface 22a of the second substrate 22 by sputtering, vapor deposition, or chemical vapor deposition. A photosensitive resin is applied to the surface of the metal film, and a pattern having a desired shape is formed on the photosensitive resin by performing exposure processing and development processing on the applied photosensitive resin. Next, the metal film is etched with an etching solution to make the metal film into a desired shape, and then the applied photosensitive resin is peeled off. Thus, the gate wiring 221 can be formed by forming and patterning a metal material.

The gate insulating film 222 is provided on the first main surface 22a so as to cover the gate wiring 221. The gate insulating film 222 is formed using an insulating material such as silicon nitride or silicon oxide. The gate insulating film 222 can be formed on the first main surface 22a of the second substrate 22 by the above-described sputtering method, vapor deposition method, chemical vapor deposition method, or the like.

  The source wiring 223 has a function of applying a signal voltage supplied from the driving IC to the signal electrode 228 through the thin film transistor TFT. The source wiring 223 is provided on the gate insulating film 222. As shown in FIG. 3, the plurality of source lines 223 are formed in a linear shape and extend in the Y direction. The plurality of source lines 223 are arranged along the X direction. The source wiring 223 may be formed using the same material as the gate wiring 221. Note that the source wiring 223 can be formed by a method similar to that of the gate wiring 221.

  In FIG. 3, a plurality of source wirings 223 are shown. For convenience of explanation, these are referred to as a first source wiring 223a, a second source wiring 223b, a third source wiring 223c, and a fourth source wiring 223d (the same applies to FIGS. 5 and 6).

  In FIG. 3, a region surrounded by the first gate wiring 221a, the second gate wiring 221b, the first source wiring 223a, and the second source wiring 223b is defined as a first region R1, and the second gate wiring 221b and the third gate A region surrounded by the wiring 221c, the first source wiring 223a, and the second source wiring 223b is a second region R2, and a region opposite to the second region R2 of the third gate wiring 221c is a third region R3. A region surrounded by the first gate line 221a, the second gate line 221b, the second source line 223b, and the third source line 223c is defined as a fourth region R4. The second gate line 221b, the third gate line 221c, and the second source line A region surrounded by 223b and the third source wiring 223c is a fifth region R5 (the same applies to FIGS. 5 and 6).

  Note that the pixel P in this embodiment is a region where each signal electrode 228 is located, and is a region surrounded by a broken line shown in FIG. 3 (the same applies to FIGS. 5 and 6).

  The first interlayer insulating film 224 is provided on the gate insulating film 222 so as to cover the source wiring 223. The first interlayer insulating film 224 is formed of an insulating material, and examples thereof include inorganic materials such as silicon nitride and silicon oxide.

  The thin film transistor TFT includes a semiconductor layer such as amorphous silicon, polycrystalline silicon, or an oxide semiconductor, a source electrode provided on the semiconductor layer, connected to the source wiring 223, and a drain electrode. The thin film transistor TFT is provided adjacent to the gate wiring 221. The drain electrode of the thin film transistor TFT is connected to the signal electrode 228 via a contact hole (not shown). As shown in FIG. 3, the source electrode extends from the source line 223 in the X direction.

  In the thin film transistor TFT, the resistance of the semiconductor layer between the source electrode and the drain electrode changes in accordance with the voltage applied to the semiconductor layer through the gate wiring 221, so that writing or non-writing of the image signal to the signal electrode 228 is possible. Be controlled.

  The planarizing film 225 is formed of an organic material, for example, a resin such as an acrylic resin, an epoxy resin, or a polyimide resin. The film thickness of the planarizing film 225 is set in the range of 1 μm to 5 μm, for example.

  The common electrode 226 has a function of generating an electric field with the signal electrode 228 by a voltage applied from the driving IC. The common electrode 226 is provided on the planarization film 225. The common electrode 226 is formed of a material having translucency and conductivity. For example, ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), ATO (Antimony Tin Oxide), AZO (Al-Doped Zinc Oxide), oxidation It is formed of tin, zinc oxide or a conductive polymer.

  The second interlayer insulating film 227 has a function of electrically insulating the signal electrode 228 and the common electrode 226 from each other. The second interlayer insulating film 227 may be formed of the same material as the first interlayer insulating film 224.

  The signal electrode 228 has a function of generating an electric field with the common electrode 226 by a signal voltage applied from the driving IC. The plurality of signal electrodes 228 are provided on the second interlayer insulating film 227. Further, the plurality of signal electrodes 228 overlap with the common electrode 226 in plan view. Each signal electrode 228 has a slit S formed therein. In the present embodiment, the slit S is rectangular, but is not limited thereto, and may be, for example, elliptical. Note that the signal electrode 228 may be formed of the same material as the common electrode 226.

  Further, as shown in FIG. 3, each signal electrode 228 is provided across the gate wiring 221. Here, for convenience of explanation, the signal electrode 228 positioned in both the first region R1 and the second region R2 is referred to as a first signal electrode 228a, and the signal electrode 228 positioned in both the second region R2 and the third region R3 is defined. The second signal electrode 228b and the signal electrode 228 located in both the fourth region R4 and the fifth region R5 are defined as the third signal electrode 228c (the same applies to FIGS. 5 and 6).

  The first signal electrode 228a is positioned so as to overlap with the first part a1 located in the first region R1, the second part a2 located in the second region R2, and the second gate wiring 221b in plan view. It has the 3rd site | part a3 which connects 1 site | part a1 and 2nd site | part a2.

  The second signal electrode 228b is located in the second region R2, a fourth portion a4 adjacent to the second portion a2 of the first signal electrode 228a, a fifth portion a5 located in the third region R3, and a third gate. It has a sixth part a6 that is located so as to overlap the wiring 221c in plan view and connects the fourth part a4 and the fifth part a5.

  The third signal electrode 228c is positioned so as to overlap the seventh part a7 located in the fourth region R4, the eighth part a8 located in the fifth region R5, and the second gate wiring 221b in plan view. It has the 9th site | part a9 which connects 7 site | part a7 and the 8th site | part a8.

  As shown in FIG. 3, the first portion a1 of the first signal electrode 228a is provided with a plurality of first slits S1 arranged along the Y direction and inclined and extended with respect to the X direction. The second portion a2 of the first signal electrode 228a is provided with a plurality of second slits S2 arranged along the Y direction and extending in a direction different from the extending direction of the first slit S1.

  Also, as shown in FIG. 3, the fourth portion a4 of the second signal electrode 228b is provided with a plurality of third slits S3 arranged along the Y direction and extending in the extending direction of the second slit S2. It has been. The fifth portion a5 of the second signal electrode 228b is provided with a plurality of fourth slits S4 arranged along the Y direction and extending in a direction different from the extending direction of the second slit S2. In the present embodiment, the fourth slit S4 of the fifth part a5 extends in the same direction as the extending direction of the first slit S1 of the first part a1.

  Further, as shown in FIG. 3, the seventh portion a7 of the third signal electrode 228c is provided with a plurality of fifth slits S5 arranged along the Y direction and extending in the extending direction of the first slit S1. It has been. The eighth portion a8 of the third signal electrode 228c is provided with a plurality of sixth slits S6 arranged along the Y direction and extending in the extending direction of the second slit S2.

In the liquid crystal display device 1, the first signal electrode 228a has a first part a1 where the first slit S1 is formed and a second part a2 where the second slit S2 is formed. That is, since the first slit S1 and the second slit S2 extending in different directions are formed in the first signal electrode 228a, an electric field is applied between the formation region of the first part a1 and the formation region of the second part a2. The orientation of the liquid crystal molecules at the time can be changed, and a wide viewing angle of the liquid crystal display device can be realized.

  Further, since the second gate wiring 221b is positioned so as to overlap the third portion a3 of the first signal electrode 228a, and the first signal electrode 228a is provided across the second gate wiring 221b, the adjacent first signal The second gate wiring 221b is not formed between the second part a2 of the electrode 228a and the fourth part a4 of the second signal electrode 228b. That is, since the light from the light source device 3 is not blocked by the second gate wiring 221b in this region, the region between the second part a2 and the fourth part a4 can be effectively used as an area contributing to image display. In addition, the second signal electrode 228b has a fourth portion a4 adjacent to the second portion a2 of the first signal electrode 228a, and the fourth portion a4 extends in the extending direction of the second slit S2. Three slits S3 are formed. That is, since the adjacent second part a2 and fourth part a4 are formed with slits S (second slit S2, third slit S3) extending in the same direction, the first signal electrode 228a in the Y direction is formed. If the end side and the end side in the Y direction of the second signal electrode 228b are inclined corresponding to the slit S (second slit S2, third slit S3), the Y direction in the second portion a2 of the first signal electrode 228a. The second slit S2 can be formed to the vicinity of the end side of the second signal electrode, and the third slit S3 can be formed to the vicinity of the end side in the Y direction of the fourth portion a4 of the second signal electrode 228b. Since the second slit S2 can be formed to the vicinity of the end sides of the first signal electrode 228a and the second signal electrode 228b, the area of the electrode portion in the vicinity of the Y direction end side of the signal electrode 228 can be reduced, and the opening at the pixel P can be reduced. It is possible to suppress a decrease in the rate and suppress a decrease in the light transmittance.

  The second gate wiring 221b is located between the first part a1 where the first slit S1 is formed and the second part a2 where the second slit S2 is formed. Here, since the slits S (first slit S1, second slit S2) extending in different directions are formed in the first part a1 and the second part a2, the first slit S1 and the second slit S2 Since the first slit S1 and the second slit S2 are difficult to form in the region between the first part a1 and the second part a2 due to the relationship of the extending direction, the area of the electrode part tends to increase in this region. The region is less likely to contribute to image display. For this reason, the second gate wiring 221b is unlikely to contribute to image display and is positioned between the first part a1 and the second part a2 provided with the slits S extending in different directions. The influence on the aperture ratio of the pixel P can be reduced by blocking the light by 221b.

  Further, in the liquid crystal display device 1, with respect to the second gate line 221b, the extending direction of the first slit S1 of the first portion a1 of the first signal electrode 228a and the extending direction of the second slit S2 of the second portion a2 are defined. Is line symmetric. As a result, the orientation direction of the liquid crystal molecules when the electric field is applied in the pixel P where the first signal electrode 228a is located becomes symmetric, so that the viewing angle characteristics are improved.

  In addition, in the liquid crystal display device 1, the fourth slit S4 of the fifth portion a5 of the second signal electrode 228b extends in the extending direction of the first slit S1. That is, the extending direction of the third slit S3 of the fourth portion a4 of the second signal electrode 228b and the extending direction of the fourth slit S4 of the fifth portion a5 are axisymmetric. As a result, the orientation direction of the liquid crystal molecules when the electric field is applied to the liquid crystal layer 23 in the pixel P where the second signal electrode 228b is located becomes symmetric, so that the viewing angle characteristics are improved.

  The liquid crystal layer 23 is provided between the first substrate 21 and the second substrate 22. The liquid crystal layer 23 includes nematic liquid crystal or the like.

  The sealing material 24 has a function of bonding the first substrate 21 and the second substrate 22 together. The sealing material 24 is provided between the first substrate 21 and the second substrate 22. This sealing material 24 is formed of an epoxy resin or the like.

  The light source device 3 has a function of emitting light toward the liquid crystal panel 2. The light source device 3 includes a light source 31 and a light guide plate 32. In the light source device 3 in the present embodiment, a point light source such as an LED is used as the light source 31, but a linear light source such as a cold cathode tube may be used.

  The first polarizing plate 4 has a function of selectively transmitting light in a predetermined vibration direction. The first polarizing plate 4 is disposed so as to face the first main surface 21 a of the first substrate 21 of the liquid crystal panel 2.

  The second polarizing plate 5 has a function of selectively transmitting light in a predetermined vibration direction. The second polarizing plate 5 is disposed so as to face the second main surface 22 b of the second substrate 22.

[Second Embodiment]
FIG. 5 is a plan view showing a main part of the liquid crystal display device 1A according to the second embodiment.

  Compared with the liquid crystal display device 1, the liquid crystal display device 1 </ b> A has an extension direction of the fifth slit S <b> 5 of the seventh portion a <b> 7 of the third signal electrode 228 c and the first portion of the first signal electrode 228 a relative to the second source line 223 b. The extending direction of the first slit S1 of a1 is axisymmetric, and the extending direction of the sixth slit S6 of the eighth portion a8 of the third signal electrode 228c and the first signal electrode with respect to the second source wiring 223b. The difference is that the extending direction of the second slit S2 of the second portion a2 of 228a is line symmetric.

  That is, in the signal electrodes 228 adjacent to each other in the X direction, the extending direction of the slits S is symmetric with respect to the source wiring 223 located between the adjacent signal electrodes 228. As a result, in the liquid crystal display device 1A, the orientation direction of the liquid crystal molecules at the time of applying an electric field is symmetrical between the pixel P where the first signal electrode 228a is located and the pixel P where the third signal electrode 228c is located. Angular characteristics are improved.

[Third Embodiment]
6 and 7 are views showing the main part of the liquid crystal display device 1B according to the third embodiment.

  The liquid crystal display device 1B is different from the liquid crystal display device 1 in the following points.

  As shown in FIG. 7, the common electrode 226 is provided on the signal electrode 228 via the second interlayer insulating film 227. Further, the slits S are not formed in the signal electrode 228, but a plurality of slits S are formed in the common electrode 226.

  The common electrode 226 of the liquid crystal display device 1B has a plurality of first slits S1 arranged along the Y direction at portions overlapping the first portion a1 of the first signal electrode 228a and extending obliquely with respect to the X direction. A plurality of second slits S2 arranged in the Y direction and extending in a direction different from the first slits S1 are provided in a portion overlapping the second portion a2 of the first signal electrode 228a. Yes. That is, since the first slit S1 and the second slit S2 extending in different directions are formed in the portion of the common electrode 226 that overlaps the first signal electrode 228a, the region where the first portion a1 is located and the second portion Since the orientation of liquid crystal molecules during application of an electric field can be changed between the region where a2 is located, a wide viewing angle can be realized.

In the liquid crystal display device 1B, the third portion a3 of the first signal electrode 228a is positioned so as to overlap with the second gate wiring 221b in plan view, and the first signal electrode 228a is provided across the second gate wiring 221b. Therefore, the second gate wiring 221b is not formed in the region between the second part a2 of the adjacent first signal electrode 228a and the fourth part a4 of the second signal electrode 228b. That is, in this area, the light from the light source device 3 is not blocked by the second gate wiring 221b, and the area between the second part a2 and the fourth part a4 can be effectively used as an area contributing to image display. Further, the second slit S2 is formed in the portion of the common electrode 226 that overlaps the second portion a2 of the first signal electrode 228a and the fourth portion a4 of the second signal electrode 228b via the second interlayer insulating film 227. As a result, the second slit S2 can be formed in the vicinity of the edge of the second part a2 and the vicinity of the edge of the fourth part a4. Can be suppressed. In addition, it is possible to form the second slit S2 also in the portion of the common electrode 226 that overlaps the region between the second portion a2 and the fourth portion a4, and to reduce the electrode formation region in the region. Thus, a decrease in aperture ratio at the pixel P can be suppressed, and a decrease in light transmittance can be suppressed.

  The second gate wiring 221b is located between the portion of the common electrode 226 where the first slit S1 is formed and the portion of the common electrode 226 where the second slit S2 is formed. Here, since the first slit S1 and the second slit S2 extend in different directions, the portion where the first slit S1 is formed by the relationship in the extending direction between the first slit S1 and the second slit S2. Since it is difficult to form the first slit S1 and the second slit S2 in the region between the first slit S2 and the portion where the second slit S2 is formed, the area of the electrode portion tends to be large in this region. It becomes difficult to contribute. Therefore, the second gate wiring 221b is unlikely to contribute to image display, and is positioned in a region between the common electrode 226 portion where the first slit S1 is formed and the common electrode 226 portion where the second slit S2 is formed. Thus, the influence of the second gate wiring 221b on the aperture ratio of the pixel P by shielding light can be reduced.

  In the liquid crystal display device 1B, the extending direction of the first slit S1 and the extending direction of the second slit S2 of the common electrode 226 are axisymmetric with respect to the second gate line 221b. As a result, the alignment direction of the liquid crystal molecules when the electric field is applied to the liquid crystal layer 23 in the pixel P where the first signal electrode 228a is located becomes symmetric, so that the viewing angle characteristics are improved.

  The common electrode 226 of the liquid crystal display device 1B is provided with a first slit S1 in a region overlapping the seventh portion a7 of the third signal electrode 228c, and also overlaps the eighth portion a8 of the third signal electrode 228c. A second slit S2 is provided in the region. That is, since the common electrode 226 located in the region of the first signal electrode 228a and the third signal electrode 228c adjacent to each other in the X direction is formed with the slit S extending in the same direction, the adjacent first signal electrode 228a Since it becomes easy to form the slit S in the portion of the common electrode 226 that overlaps with the third signal electrode 228c, the manufacturing process of the liquid crystal display device can be simplified.

  The present invention is not particularly limited to the first to third embodiments, and various modifications and improvements can be made within the scope of the present invention.

1, 1A, 1B Liquid crystal display device 2 Liquid crystal panel P Pixel R1 1st area | region R2 2nd area | region R3 3rd area | region R4 4th area | region R5 5th area | region
21 First board
21a 1st main surface
21b Second main surface (main surface)
211 Shading film
212 Color filter
22 Second board
22a First main surface (main surface)
22b 2nd main surface
221 Gate wiring
221a First gate wiring
221b Second gate wiring
221c Third gate wiring
222 Gate insulation film
223 source wiring
223a First source wiring
223b Second source wiring
223c Third source wiring
223d Fourth source wiring
224 First interlayer insulating film
225 Planarization film (first insulating film)
226 Common electrode
227 Second interlayer insulating film (second insulating film)
228 Signal electrode
228a First signal electrode a1 First part a2 Second part a3 Third part
228b Second signal electrode a4 Fourth part a5 Fifth part a6 Sixth part
228c 3rd signal electrode a7 7th part a8 8th part a9 9th part
TFT thin film transistor S slit S1 first slit S2 second slit S3 third slit S4 fourth slit S5 fifth slit S6 sixth slit
23 Liquid crystal layer
24 Sealing material 3 Light source device
31 Light source
32 Light guide plate 4 First polarizing plate 5 Second polarizing plate

Claims (5)

A first substrate and a second substrate arranged with their main surfaces facing each other, a liquid crystal layer arranged between the first substrate and the second substrate, and a Y direction on the main surface of the second substrate First linear wirings, second gate wirings, and third gate wirings that are sequentially arranged on the main surface of the second substrate, arranged in the X direction perpendicular to the Y direction. Linear first source wiring and second source wiring intersecting the first gate wiring to third gate wiring, the first gate wiring to third gate wiring, the first source wiring, and the second gate wiring. A first insulating film provided on the main surface of the second substrate so as to cover the source wiring, a common electrode provided on the first insulating film, and on the common electrode via the second insulating film Provided with a first signal electrode and a second signal electrode adjacent to each other in the Y direction. ,
The first signal electrode includes a first portion located in a first region surrounded by the first gate wiring, the second gate wiring, the first source wiring, and the second source wiring, and the second gate wiring. A second part located in a second region surrounded by the third gate line, the first source line and the second source line, and the first part located so as to overlap the second gate line; A third part connecting the second part,
The second signal electrode includes a fourth portion provided in the second region and adjacent to the second portion of the first signal electrode,
The first portion of the first signal electrode is provided with a plurality of first slits arranged in the Y direction and extending in a first direction inclined with respect to the X direction. The second portion of the signal electrode is provided with a plurality of second slits arranged along the Y direction and extending in a second direction different from the first direction,
The liquid crystal display device, wherein the fourth portion of the second signal electrode is provided with a plurality of third slits arranged in the Y direction and extending in the second direction. The second signal electrode includes a fifth part located in a third region opposite to the second region of the third gate wiring, and the fourth part located so as to overlap the third gate wiring. And a sixth portion connecting the fifth portion,
2. The liquid crystal display device according to claim 1, wherein the fifth portion of the second signal electrode is provided with a plurality of fourth slits arranged in the Y direction and extending in the first direction. A third linear source line adjacent to the second source line on the side opposite to the first source line, provided to intersect the first gate line to the third gate line;
A first signal electrode provided on the common electrode via the second insulating film; and a third signal electrode adjacent in the X direction;
The third signal electrode includes a seventh portion provided in a fourth region surrounded by the first gate wiring, the second gate wiring, the second source wiring, and the third source wiring, and the second gate. An eighth part located in a fifth region surrounded by the wiring, the third gate wiring, the second source wiring, and the third source wiring, and the seventh part located so as to overlap the second gate wiring And a ninth part connecting the eighth part,
The seventh portion of the third signal electrode has a plurality of lines extending in a third direction, which is arranged along the Y direction and is symmetrical with the first direction with respect to the second source wiring. A fifth slit is provided, and the eighth portion of the third signal electrode extends in a fourth direction which is a line symmetric with the second direction with respect to the second source wiring. The liquid crystal display device according to claim 1, wherein a plurality of sixth slits are provided.   The liquid crystal display device according to claim 1, wherein the second direction is a direction that is line-symmetric with the first direction with respect to the second gate wiring. A first substrate and a second substrate arranged with their main surfaces facing each other, a liquid crystal layer arranged between the first substrate and the second substrate, and a Y direction on the main surface of the second substrate First linear wirings, second gate wirings, and third gate wirings that are sequentially arranged on the main surface of the second substrate, arranged in the X direction perpendicular to the Y direction. Linear first source wiring and second source wiring intersecting the first gate wiring to third gate wiring, the first gate wiring to third gate wiring, the first source wiring, and the second gate wiring. A first insulating film provided on the main surface of the second substrate so as to cover the source wiring; and a first signal electrode and a second signal electrode adjacent to each other in the Y direction provided on the first insulating film; The first signal electrode, the second signal electrode and the front through the second insulating film And a common electrode provided so as to overlap the regions between the first signal electrode and the second signal electrode,
The first signal electrode includes a first portion located in a first region surrounded by the first gate wiring, the second gate wiring, the first source wiring, and the second source wiring, and the second gate wiring. A second part located in a second region surrounded by the third gate line, the first source line and the second source line, and the first part located so as to overlap the second gate line; A third part connecting the second part,
The second signal electrode includes a fourth portion provided in the second region and adjacent to the second portion of the first signal electrode,
The common electrode includes a plurality of first slits extending in a first direction inclined with respect to the X direction, arranged along the Y direction in a region overlapping the first portion of the first signal electrode, A plurality of regions extending in a second direction different from the first direction, arranged along the Y direction in a region overlapping the second portion of the first signal electrode and a region overlapping the fourth portion of the second signal electrode. A liquid crystal display device comprising a second slit.

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