JP5586753B2 - LCD panel - Google Patents

Description

  The present invention relates to a horizontal electric field type liquid crystal display panel, and more particularly to a horizontal electric field type liquid crystal display panel in which an upper electrode having a slit-like opening operates as a common electrode.

  Liquid crystal display panels are characterized by their light weight, thinness, and low power consumption compared to CRTs (cathode ray tubes), and are therefore used in many electronic devices for display purposes. The liquid crystal display panel displays an image by changing the direction of liquid crystal molecules aligned in a predetermined direction by an electric field by rubbing the alignment film, thereby changing the amount of light transmitted or reflected.

  As a method of applying an electric field to a liquid crystal layer of a liquid crystal display panel, there are a vertical electric field type and a horizontal electric field type. A vertical electric field type liquid crystal display panel applies a substantially vertical electric field to liquid crystal molecules by a pair of electrodes arranged with a liquid crystal layer interposed therebetween. Known examples of the vertical electric field type liquid crystal display panel include a TN (Twisted Nematic) mode, a VA (Vertical Alignment) mode, and an MVA (Multi-domain Vertical Alignment) mode. A horizontal electric field type liquid crystal display panel is provided with a pair of electrodes insulated from each other on one inner surface side of a pair of substrates disposed with a liquid crystal layer interposed therebetween, and a substantially horizontal electric field is applied to liquid crystal molecules. To be applied. As this lateral electric field type liquid crystal display panel, there are known an IPS (In-Plane Switching) mode in which a pair of electrodes do not overlap in a plan view and an FFS (Fringe Field Switching) mode in which they overlap.

  Among these, in the FFS mode liquid crystal display panel, a pair of electrodes including a common electrode and a pixel electrode are arranged in different layers with an insulating film interposed therebetween, and slit-like openings are formed in the common electrode or the pixel electrode on the liquid crystal layer side. And a substantially horizontal electric field passing through the slit-shaped opening is applied to the liquid crystal layer. The FFS mode liquid crystal display panel is widely used in recent years because it can obtain a wide viewing angle and improve image contrast. In this FFS mode liquid crystal display panel, a pixel electrode is formed on the same plane as a TFT (Thin Film Transistor) as a switching element (see Patent Document 1 below), and a common electrode and a pixel electrode are both above the TFT. (Refer to the following Patent Document 2).

  Among these, the liquid crystal display panel in which the common electrode and the pixel electrode are both disposed above the TFT is covered with an interlayer film formed of a resin layer on the surface of the TFT and the like, and the surface of the interlayer film is made of a transparent conductive material. A lower electrode is formed. This lower electrode can be operated as either a pixel electrode or a common electrode. When this lower electrode is operated as a pixel electrode, a contact hole is formed in the interlayer film, and the pixel electrode is electrically connected to the switching element through the contact hole. On the surface of the lower electrode, an upper electrode made of a transparent conductive material in which a plurality of slit-like openings are formed for each pixel is formed in a solid shape across the plurality of pixels via an insulating film. The upper electrode is electrically connected to a common wiring formed around the display area and operates as a common electrode. Among the liquid crystal display panels in which the upper electrode and the lower electrode are both disposed above the TFT, the FFS mode liquid crystal display panel in which the lower electrode operates as a pixel electrode and the upper electrode operates as a common electrode is a TFT or a liquid crystal display panel. There are advantages that the opening in the vicinity of the boundary between the pixels is wide, and that there is no wiring for the common electrode in the display area, so that the opening ratio is increased.

JP 2007-327997 A JP 2008-32899 A JP 2005-258408 A

  However, in the conventional FFS mode liquid crystal display panel as described above, when the common electrode having the slit-like opening is formed across a plurality of pixels, the electrical connection to the outside of the common electrode is performed at the periphery of the display region. Therefore, there is a problem that the resistance value of the common electrode is increased and flicker and crosstalk are defective. On the other hand, in an IPS mode liquid crystal display panel, for example, as disclosed in Patent Document 3, the electrical resistance of each electrode when the pixel electrode and the common electrode are formed of a transparent conductive material is prevented. For this purpose, it is known that both the pixel electrode and the common electrode have a double structure of a transparent electrode and a metal electrode. However, in the case of the FFS mode liquid crystal display panel, since the pixel electrode and the common electrode overlap each other in a plan view, it is important that the pixel electrode and the common electrode have a double structure of a transparent electrode and a metal electrode. Can not be adopted because it leads to a decrease in

  The present invention has been made to solve the above problems, and an object of the present invention is to provide an FFS mode liquid crystal display panel in which flicker and crosstalk are reduced by reducing the electric resistance value of the common electrode. It is in.

  In order to achieve the above object, a liquid crystal display panel according to the present invention has a pair of substrates opposed to each other with a liquid crystal layer interposed therebetween, and one of the pair of substrates is arranged in a matrix in a display region. A plurality of scanning lines and signal lines, a common wiring formed along the peripheral edge of the display area, an interlayer film formed over at least the entire display area, and a plurality of lines on the surface of the interlayer film. A pixel electrode made of a transparent conductive material formed for each pixel region partitioned by the scanning line and the signal line, and an interelectrode insulating film formed on the pixel electrode and the interlayer film in the display region A common electrode made of the transparent conductive material formed on the entire surface of the inter-electrode insulating film, having a plurality of slits for each pixel region and electrically connected to the common wiring, LCD panel equipped with The transparent conductive material constituting the common electrode at a position overlapping the scanning line and the signal line in a plan view between the surface of the common electrode or between the common electrode and the inter-electrode insulating film. A conductive layer having a conductivity higher than that of the material; and the common electrode extends to a peripheral portion of the display region so as to cover the display region, and is electrically connected to the common wiring. The conductive layer extends to the peripheral edge of the display region, and is electrically connected to the common wiring in a region where the end of the conductive layer and the common wiring overlap.

  The liquid crystal display panel according to the present invention includes a pixel electrode made of a transparent conductive material formed for each pixel region partitioned by a plurality of scanning lines and signal lines on the surface of the interlayer film, and on the pixel electrode in the display region and the interlayer film. An inter-electrode insulating film formed on the entire surface of the inter-electrode insulating film is formed of a transparent conductive material in which a plurality of slits are formed for each pixel region and electrically connected to a common wiring. A common electrode is provided. With this configuration, the liquid crystal display panel of the present invention operates in the FFS mode. As the insulating film, an inorganic insulating film such as silicon oxide or silicon nitride can be used. Further, as the interlayer film, a photosensitive or non-photosensitive resin material having good transparency and excellent electrical insulation can be appropriately selected and used. Further, a transparent conductive material such as ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide) is used as the pixel electrode and the common electrode.

  Further, in the liquid crystal display panel of the present invention, the transparent electrode that constitutes the common electrode is located on the surface of the common electrode or between the common electrode and the interelectrode insulating film, and in a position overlapping the scanning line and the signal line in plan view. A conductive layer having better conductivity than the conductive material is formed. In an FFS mode liquid crystal display panel, when a common electrode having a slit-like opening is formed across a plurality of pixels, the wiring to the outside is performed at the periphery of the display region. growing. When the resistance value of the common electrode increases, the potential of the common electrode changes, which causes flicker and crosstalk. However, the conductivity is better than the transparent conductive material that constitutes the common electrode in a position overlapping the scanning line and the signal line in a plan view between the surface of the common electrode or between the common electrode and the interelectrode insulating film. When the layer is formed, the electric resistance of the common electrode is apparently reduced. Therefore, according to the liquid crystal display panel of the present invention, it is possible to obtain a liquid crystal display panel with good display image quality in which flicker and crosstalk are suppressed.

  Note that the conductive layer having better conductivity than the transparent conductive material constituting the common electrode is formed at a position overlapping the scanning line and the signal line in a plan view, which affects the brightness of the liquid crystal display panel. Never give. Therefore, the conductive layer having better conductivity than the transparent conductive material constituting the common electrode may be transparent or opaque, and a conductive resin in which a metal thin film and a metal filler are mixed and dispersed in a resin. A thin film made of a material, a conductive carbon thin film, or the like can be used. The common wiring is formed of the same material as the scanning line forming material or the signal line forming material, which is usually a metal material. Further, the contact resistance between the transparent conductive material and the metal material is larger than the contact resistance between the metal material and the metal material. Therefore, according to the liquid crystal display panel of this aspect, since the contact resistance between the conductive layer and the common wiring can be further reduced, there is a liquid crystal display panel with less flicker and crosstalk and good display image quality. can get.

  In the liquid crystal display panel according to the present invention, the conductive layer has a linear shape extending to the common wiring along the scanning lines and the signal lines, and extends to a peripheral portion of the display area. In addition, the linear wiring is electrically connected to the common wiring in a region where each end of the linear shape and the common wiring overlap.

  According to the liquid crystal display panel of this aspect, since the contact resistance between the conductive layer and the common wiring can be further reduced, a liquid crystal display panel with less flicker and crosstalk and good display image quality can be obtained. .

  In the liquid crystal display panel according to the present invention, the conductive layer is preferably light-shielding.

  In a liquid crystal display panel, a black matrix is formed on the side of the color filter substrate, particularly at a position overlapping the scanning lines and signal lines in plan view, for the purpose of preventing light leakage from the vicinity of the scanning lines and signal lines and improving the contrast. ing. Therefore, according to the liquid crystal display panel of this aspect, since the light-shielding conductive layer is formed at a position overlapping the scanning line and the signal line in plan view, a black matrix is not particularly formed in the color filter layer. The light leakage prevention function can be achieved.

  In the liquid crystal display panel according to the present invention, the conductive layer is preferably made of a metal material.

  The metal material has extremely good conductivity and light shielding properties as compared with the transparent conductive material. Therefore, according to the liquid crystal display panel of such an embodiment, the electrical resistance of the common electrode can be apparently reduced even when the conductive layer made of the metal material is thin, and the thickness of the metal material is the orientation of the liquid crystal. Since it is difficult to affect the characteristics, a liquid crystal display panel with good display image quality can be obtained. In addition, as a metal material that can be used in the liquid crystal display panel of such an embodiment, aluminum, aluminum alloy, molybdenum, tungsten, titanium, copper, or the like can be used, and even a single layer structure has a multilayer structure. There may be. The conductive layer may be a thin film made of a conductive resin material in which a metal filler is mixed and dispersed in a resin. The conductive layer may be a conductive carbon thin film.

  In the liquid crystal display panel according to the present invention, the width of the conductive layer is preferably the same as or narrower than the widths of the scanning lines and the signal lines.

  According to the liquid crystal display panel of this aspect, since the width of the conductive layer is the same as or narrower than the width of the scanning line and the signal line, the decrease in the aperture is reduced and a bright display liquid crystal display panel is obtained. In particular, when the width of the conductive layer is made narrower than the width of the scan line and the signal line, it is possible to prevent the conductive layer from protruding from the scan line or the signal line due to a mask shift or the like at the time of manufacture, thereby reducing the aperture ratio. It becomes like this.

  In the liquid crystal display panel according to the present invention, the width of the conductive layer can be made larger than the widths of the scanning lines and the signal lines.

  According to the liquid crystal display panel of this aspect, since light leakage from the vicinity of the scanning lines and the signal lines can be further reduced, the conductive layer can be used as a black matrix, and a liquid crystal display panel with better contrast can be obtained. can get.

  According to the present invention, it is possible to provide an FFS mode liquid crystal display panel in which flicker and crosstalk are reduced by reducing the electric resistance value of the common electrode.

FIG. 3 is a plan view of one pixel that is seen through a color filter substrate of the liquid crystal display panel of the first embodiment. It is sectional drawing along the II-II line of FIG. FIG. 3 is a sectional view taken along line III-III in FIG. It is a top view which shows a part of metal wiring part in the common electrode of the liquid crystal display panel of 1st Embodiment. It is the top view for 1 pixel which sees through and showed the color filter substrate of the liquid crystal display panel of 2nd Embodiment. It is sectional drawing along the VI-VI line of FIG. It is sectional drawing along the VII-VII line of FIG.

  Hereinafter, the best embodiment of the present invention will be described with reference to the drawings. However, the embodiment shown below shows an example of a liquid crystal display panel for embodying the technical idea of the present invention, and is not intended to specify the present invention for this liquid crystal display panel. Other embodiments that fall within the scope of the claims are equally applicable. In each drawing used for the description in this specification, each layer and each member are displayed in different scales so that each layer and each member can be recognized on the drawing. However, it is not necessarily displayed in proportion to the actual dimensions.

  FIG. 1 is a plan view of one pixel, which is seen through the color filter substrate of the liquid crystal display panel of the first embodiment. FIG. 2 is a sectional view taken along line II-II in FIG. FIG. 3 is a sectional view taken along line III-III in FIG. FIG. 4 is a plan view showing a part of the metal wiring portion in the common electrode of the liquid crystal display panel of the first embodiment. FIG. 5 is a plan view for one pixel, which is seen through the color filter substrate of the liquid crystal display panel of the second embodiment. 6 is a cross-sectional view taken along line VI-VI in FIG. FIG. 7 is a cross-sectional view taken along line VII-VII in FIG.

[First Embodiment]
A liquid crystal display panel 10A according to the first embodiment will be described with reference to FIGS. In the liquid crystal display panel 10 </ b> A according to the first embodiment, the liquid crystal layer 11 is sandwiched between the array substrate 12 and the color filter substrate 13. The thickness of the liquid crystal layer 11 is uniformly maintained by a columnar spacer (not shown). Polarizing plates (both not shown) are affixed to the back surface of the array substrate 12 and the front surface of the color filter substrate 13, respectively, and a backlight (not shown) for irradiating light is provided on the back side of the array substrate 12. It is arranged.

  First, the configuration of the array substrate 12 will be described. In the array substrate 12, a plurality of scanning lines 19 are formed in parallel on the liquid crystal layer 11 side of the first substrate body 18 made of glass, quartz, plastic, or the like, and a gate insulating film 20 is formed to cover the scanning lines 19. Has been. The scanning line 19 is formed of an opaque metal such as an aluminum metal, an aluminum alloy, or molybdenum, and extends in the X-axis direction in FIG. The gate insulating film 20 is formed of an inorganic insulating film such as silicon oxide or silicon nitride.

  A semiconductor layer 21 made of, for example, amorphous silicon is formed on the gate insulating film 20, and a source electrode S and a drain electrode D are formed so as to partially run over the semiconductor layer 21. The semiconductor layer 21 is disposed to face a portion branched from the scanning line 19 via the gate insulating film 20, and the portion branched from the scanning line 19 constitutes a gate electrode G of the TFT. The source electrode S consists of a portion branched from the signal line 22. The signal line 22 and the drain electrode D are each formed of an opaque metal such as an aluminum metal, an aluminum alloy, or molybdenum, and the signal line 22 extends in the Y-axis direction of FIG.

  A passivation film 23 made of an inorganic insulating film such as silicon oxide or silicon nitride is formed to cover the semiconductor layer 21, the source electrode S, and the drain electrode D, and an interlayer film 24 made of a resin material is formed to cover the passivation film 23. Has been. As the interlayer film 24, a photosensitive or non-photosensitive resin material having good transparency and excellent electrical insulation can be appropriately selected and used. A pixel electrode 25 made of a transparent conductive material such as ITO or IZO is formed so as to cover the interlayer film 24. A first contact hole 26 is formed so as to reach the drain electrode D through the passivation film 23 and the interlayer film 24, and the pixel electrode 25 and the drain electrode D are electrically connected to each other through the first contact hole 26. It is connected.

  An interelectrode insulating film 27 made of an inorganic insulating film such as silicon oxide or silicon nitride is formed so as to cover the pixel electrode 25. The interelectrode insulating film 27 is formed under a film forming condition at a temperature lower than that of the passivation film 23 so that the surfaces of the pixel electrode 25 and the interlayer film 24 are not roughened. A common electrode 28 made of a transparent conductive material made of ITO or IZO is formed on the surface of the pixel electrode 25 and the interelectrode insulating film 27 on the liquid crystal layer 11 side. The common electrode 28 is electrically connected to the common wiring 40 (see FIG. 4) through the second contact hole 41 at the periphery of the display region 38. Further, on the liquid crystal layer 11 side of the common electrode 28, a conductive layer 29 a made of a material having better conductivity than the common electrode 28 made of a transparent conductive material is superimposed on the scanning lines 19 and the signal lines 22 in plan view. It is formed in the position to do. The details of the common electrode 28 and the conductive layer 29a formed on the common electrode 28 will be described later. A first alignment film 30 made of, for example, polyimide is formed so as to cover the interelectrode insulating film 27, the common electrode 28, and the conductive layer 29. The first alignment film 30 is rubbed in the direction of the scanning line 19.

  Next, the color filter substrate 13 will be described. The color filter substrate 13 has a second substrate body 33 made of glass, quartz, plastic, or the like as a base, and the second substrate body 33 transmits different colored light (R, G, B, or colorless) for each subpixel. A color filter layer 34 and a black matrix 35 are formed. A top coat layer 36 is formed so as to cover the color filter layer 34 and the black matrix 35, and a second alignment film 37 made of, for example, polyimide is formed so as to cover the top coat layer 36. The second alignment film 37 is subjected to a rubbing process in the direction opposite to that of the first alignment film 30.

  Then, the array substrate 12 and the color filter substrate 13 formed as described above are arranged to face each other, the peripheral portion is sealed with a sealing material (not shown), and the liquid crystal layer 11 is placed between the array substrate 12 and the color filter substrate 13. The liquid crystal display panel 10A of the first embodiment is obtained by sealing in the sealed area formed in the above. In the liquid crystal display panel 10A of the first embodiment, the transmission axis of the polarizing plate on the array substrate 12 side and the transmission axis of the polarizing plate on the color filter substrate 13 side are arranged so as to be orthogonal to each other. The transmission axis of the 13th polarizing plate is arranged to be parallel to the Y axis of FIG. With such a configuration, the rubbing direction of the first alignment film 30 is a direction that intersects the main direction of the electric field generated between the common electrode 28 and the pixel electrode 25. In the initial state, the liquid crystal aligned in parallel along the rubbing direction is rotated and reoriented to the main direction side of the electric field by applying a voltage between the common electrode 28 and the pixel electrode 25. Based on the difference between the initial alignment state and the alignment state at the time of voltage application, the light and dark display of each sub-pixel is performed.

  Next, specific configurations of the common electrode 28 and the conductive layer 29a will be described. The common electrode 28 includes a strip-shaped electrode portion 32 formed by a plurality of “<”-shaped slit-shaped openings 31 extending in the X-axis direction in FIG. 1. The strip electrode portions 32 of the pixel electrode 25 and the common electrode 28 function as a pair of capacitors, and the interelectrode insulating film 27 sandwiched between the pixel electrode 25 and the common electrode 28 functions as a dielectric film. Thus, a storage capacitor is formed.

  The slit-shaped opening 31 is formed by exposing and etching the common electrode 28 by photolithography. The rubbing direction of the first alignment film 30 is directed from the formation state of the slit-shaped openings 31 to the extending direction of the scanning lines 19, and the extending direction of the slit-shaped openings 31 is about 3 degrees to about about the rubbing direction. It is made to tilt 25 degrees. Accordingly, when an electric field is applied between the pixel electrode 25 and the common electrode 28, the liquid crystal can be rotated in the same direction, so that a good display image quality can be obtained. The shape of the slit-shaped opening 31 is not only a horizontal “<” shape along the scanning line 19 as shown in FIG. 1, but also a “<” shape in the vertical direction along the signal line 22. It may be shaped like a letter, or it may be a bar that does not have a bent portion. In particular, in the case of a bar having no bent portion, it may be in a state extending parallel or inclined along the scanning line, or may be in a state extending parallel or inclined in the vertical direction along the signal line. The state may extend in a plurality of directions.

  As described above, when the slit-shaped opening 31 is formed on the surface of the common electrode 28, the area of the common electrode 28 is reduced by that amount, so that the electric resistance of the common electrode 28 is increased. Therefore, in the liquid crystal display panel 10A of the first embodiment, the conductivity is better than that of the transparent conductive material constituting the common electrode 28 so as to overlap all the scanning lines 19 and the signal lines 22 in a plan view. The layer 29a is formed in a matrix. Since the conductive layer 29a is formed at a position overlapping the scanning line 19 and the signal line 22 in plan view, it does not affect the brightness of the liquid crystal display panel 10A. May be opaque. However, in the liquid crystal display panel, for the purpose of preventing light leakage from the vicinity of the scanning lines and signal lines and improving the contrast, a black matrix is formed on the color filter substrate side particularly at a position overlapping the scanning lines and signal lines in a plan view. Is formed. For this reason, when the conductive layer 29a is formed of a light-shielding material, the conductive layer 29a can provide a function of preventing light leakage. As such a light-shielding conductive layer 29a, a metal thin film, a thin film made of a conductive resin material in which a metal filler is mixed and dispersed in a resin, a conductive carbon thin film, or the like can be used. In the case of a metal thin film, for example, molybdenum, aluminum, aluminum alloy, copper, chromium, tungsten, titanium and the like can be used.

  In the liquid crystal display panel 10A of the first embodiment, the width of the conductive layer 29a may be the same as the width of the scanning lines 19 and the signal lines 22, or may be thin or thick. When the width of the conductive layer 29a is the same as or narrower than the width of the scanning line 19 and the signal line 22, the decrease in the aperture is reduced, so that the liquid crystal display panel 10A capable of bright display can be obtained. In particular, if the width of the conductive layer 29a is made narrower than the width of the scanning line 19 and the signal line 22, the conductive layer 29a protrudes from the scanning line 19 and the signal line 22 due to mask displacement at the time of manufacture, and the aperture ratio decreases. Can be prevented. Further, when the width of the conductive layer 29a is larger than the width of the scanning line 19 and the signal line 22, light leakage due to the disorder of the alignment of the liquid crystal in the vicinity of the scanning line 19 and the signal line 22 can be reduced. Since the conductive layer 29a can be used as a black matrix, the liquid crystal display panel 10A having a good contrast can be obtained without increasing the number of layers. In the liquid crystal display panel 10A of the first embodiment, an example is shown in which the conductive layer 29a is formed in a matrix so as to overlap both the scanning lines 19 and the signal lines 22 in a plan view. May be formed so as to overlap with each other, or may be formed by thinning out as appropriate.

  Next, an electrical connection form between the common electrode 28 and the conductive layer 29a and the common wiring 40 will be described with reference to FIG. On the surface of the array substrate 12 of the liquid crystal display panel 10A of the first embodiment, a common electrode 28 is formed across all the pixels so as to cover the display region 38 in plan view. On the periphery of the display area 38, a lead-out wiring 39 connected to the scanning line 19 and the signal line 22 extending from the display area 38 is formed, and a common wiring 40 is further formed on the outer peripheral side. The common wiring 40 is made of the same metal material as the scanning line 19 or the signal line 22. The common electrode 28 extends to the common line 40 through the upper layer of the lead-out line 39 around the periphery of the display region 38, and is electrically connected to the common line 40 through the plurality of second contact holes 41. The conductive layer 29 a formed in a matrix extends to the common wiring 40 on the surface of the common electrode 28 and is directly electrically connected to the common wiring 40 through the third contact hole 42.

  Since the common wiring 40 is formed of the same metal material as the scanning line 19 or the signal line 22, the electric resistance is small. However, the contact resistance between the common electrode made of the transparent conductive layer is very large compared to the contact resistance between the metal material and the metal material. Therefore, in the liquid crystal display panel 10A of the first embodiment, the common electrode 28 and the conductive layer 29a are individually electrically connected to the common wiring 40 through the second contact hole 41 and the third contact hole 42, respectively. It was to so. By adopting such a configuration, the contact resistance between the conductive layer 29a and the common wiring 40 can be further reduced, so that the liquid crystal display panel 10A with less flicker and crosstalk and good display image quality can be obtained. can get.

[Second Embodiment]
In the first embodiment, the conductive layer 29a is formed on the surface of the common electrode 28. However, the conductive layer 29a can also be formed between the common electrode 28 and the interelectrode insulating film 27. A liquid crystal display panel 10B of the second embodiment having such a configuration will be described with reference to FIGS. 5 to 7, the same reference numerals are given to the same components as those shown in FIGS. 1 to 3, and detailed description thereof is omitted. The electrical connection form between the common electrode 28 and the conductive layer 29b and the common wiring 40 in the liquid crystal display panel 10B of the second embodiment is the same as that of the liquid crystal display panel 10A of the first embodiment shown in FIG. Since this is the same as the case, the illustration is omitted.

  The liquid crystal display panel 10B of the second embodiment has the same configuration as the liquid crystal display panel 10A of the first embodiment except that the conductive layer 29b is formed between the common electrode 28 and the interelectrode insulating film 27. That is, the liquid crystal display panel 10B includes a pixel electrode 25 and an interelectrode insulating film 27 formed on the surface of the interlayer film 24, and the scanning lines of the array base 12 in a plan view of the surface of the interelectrode insulating film 27. A conductive layer 29 b is formed at a position overlapping with 19 and the signal line 22. As a material for forming the conductive layer 29b, the same material as that of the conductive layer 29a in the liquid crystal display panel 10A of the first embodiment can be used.

  A common electrode 28 made of a transparent conductive material made of ITO or IZO and having a slit-like opening 31 is formed on the surface of the pixel electrode 25, the interelectrode insulating film 27, and the conductive layer 29b on the liquid crystal layer 11 side. Has been. A first alignment film 30 made of, for example, polyimide is formed so as to cover the interelectrode insulating film 27 and the common electrode 28, and the first alignment film 30 is subjected to a rubbing process in the scanning line 19 direction. Also in the liquid crystal display panel 10B having such a configuration, the same effects as those of the liquid crystal display panel 10A of the first embodiment can be obtained.

  10A, 10B: Display panel 11: Liquid crystal layer 12: Array substrate 13: Color filter substrate 18: First substrate body 19: Scanning line 20: Gate insulating film 21: Semiconductor layer 22: Signal line 23: Passivation film 24: Interlayer film 25: Pixel electrode 26: First contact hole 27: Interelectrode insulating film 28: Common electrode 29a, 29b: Conductive layer 30: First alignment film 31: Slit-shaped opening 32: Strip electrode part 33: Second substrate body 34 : Color filter layer 35: Black matrix 36: Topcoat layer 37: Second alignment film 38: Display area 39: Leading wiring 40: Common wiring 41: Second contact hole 19 42: Third contact hole

Claims (8)

A pair of substrates disposed opposite to each other with a liquid crystal layer interposed therebetween, and one of the pair of substrates includes:
A plurality of scanning lines and signal lines arranged in a matrix in the display area;
Common wiring formed along the peripheral edge of the display area;
An interlayer film formed at least over the entire display area;
A pixel electrode made of a transparent conductive material formed for each pixel region defined by a plurality of the scanning lines and the signal lines on the surface of the interlayer film;
An interelectrode insulating film formed on the pixel electrode and the interlayer film in the display region;
A common electrode made of the transparent conductive material formed on the entire surface of the inter-electrode insulating film, having a plurality of slits for each pixel region and electrically connected to the common wiring;
In a liquid crystal display panel with
From the transparent conductive material constituting the common electrode at a position overlapping the scanning line and the signal line in plan view between the surface of the common electrode or between the common electrode and the interelectrode insulating film Has a conductive layer with good conductivity,
The common electrode extends to a peripheral portion of the display area so as to cover the display area, and is electrically connected to the common wiring,
The conductive layer has a linear shape extending to the common wiring along the scanning line and the signal line, and extends to a peripheral edge of the display region, and each end of the linear shape and the Electrically connected to the common wiring in a region where the common wiring overlaps,
LCD display panel.   The liquid crystal display panel according to claim 1, wherein the conductive layer is light-shielding.   The liquid crystal display panel according to claim 2, wherein the conductive layer is made of a metal material.   The liquid crystal display panel according to claim 3, wherein the metal material is any one of aluminum, an aluminum alloy, molybdenum, tungsten, titanium, and copper.   The liquid crystal display panel according to claim 2, wherein the conductive layer is a thin film made of a conductive resin material in which a metal filler is mixed and dispersed in a resin.   The liquid crystal display panel according to claim 2, wherein the conductive layer is a conductive carbon thin film.   The liquid crystal display panel according to claim 2, wherein a width of the conductive layer is the same as or narrower than a width of the scanning line and the signal line.   The liquid crystal display panel according to claim 2, wherein a width of the conductive layer is larger than a width of the scanning line and the signal line.

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