JP5071323B2 - Liquid crystal display panel and method for manufacturing liquid crystal display panel - Google Patents

Description

  The present invention relates to a liquid crystal display panel used in a liquid crystal display device and a method for manufacturing the liquid crystal display panel.

  A liquid crystal display panel provided in a liquid crystal display device is manufactured by sandwiching a liquid crystal layer between an array substrate in which electrodes constituting wirings and pixels are formed in a matrix and a color filter substrate on which a color filter is formed. . A film made of an organic polymer material such as polyimide is applied to the array substrate or the color filter substrate, and an alignment film is formed by heat treatment. The alignment film has a function of preferentially aligning liquid crystal molecules in the liquid crystal layer in a specific direction. When the alignment film is simply applied, the liquid crystal molecules are simply aligned in parallel to the surface of the substrate, and the liquid crystal molecules cannot be aligned (aligned) in a certain direction. Therefore, the alignment film is subjected to a rubbing process in which the surface is mechanically rubbed (rubbed) in a certain direction with a rubbing cloth such as rayon, thereby aligning the liquid crystal molecules in a direction having a certain relationship with the rubbed direction. Has been done.

  After the rubbing process is performed in this way, a pair of substrates composed of the array substrate and the color filter substrate are arranged to face each other via a spacer, and a sealing agent is arranged and bonded to the peripheral portion between them, and glass A liquid crystal display panel is manufactured by filling liquid crystal between the substrates. A liquid crystal display device is manufactured using the liquid crystal display panel thus manufactured. In the liquid crystal display panel manufactured in the manufacturing process of the liquid crystal display device, the alignment film is formed in the inner region of the seal region in order to maintain the reliability with respect to humidity and the adhesive strength of the sealant. Here, the inner area of the seal area corresponds to a pixel area for displaying a liquid crystal panel and a pixel peripheral area between the pixel area and the seal area. For this reason, conventionally, as a method for forming the alignment film, a solution such as polyimide or a precursor thereof is applied only to the inner region of the seal region by a printing method, heat-treated, and then subjected to an alignment treatment with a rubbing cloth.

  By the way, although the rubbing process is performed on the entire substrate, a portion having low adhesion of the alignment film may be peeled off during the rubbing process and may be reattached in the pixel region. When redeposited in the pixel region, the surface property of the portion to which the alignment film is attached is different from that of other portions, and when the liquid crystal is brought into contact, the arrangement of the liquid crystal molecules is disturbed to produce bright spots, resulting in product defects.

  In order to cope with this, Patent Document 1 discloses a method in which a plurality of convex portions having affinity for the alignment film are formed in a relatively flat pixel peripheral region on the TFT substrate to firmly adhere the alignment film. Has been.

2004-341334

  However, as a result of our study, peeling of the alignment film due to rubbing is caused by stepped portions such as metal wiring formed in the pixel peripheral region of the substrate surface and structures covered with an insulating film, particularly rubbing rollers. It was found that the alignment film is easy to proceed to the flat region starting from the stepped portion on the side where it rides.

  The method of Patent Document 1 only improves the adhesion of the alignment film in a relatively flat region, and the alignment film peeling still occurs at the step portion, and the alignment film peeling is only partially reduced. . Further, it has been found that peeling is likely to occur at the stepped portion of the wiring portion made of a metal such as Al, which is said to have affinity for polyimide, which is the material of the alignment film, in Patent Document 1.

  Accordingly, the present invention has been made in view of such problems, and a liquid crystal display panel capable of preventing the peeling of the alignment film in the peripheral region having the metal wiring and realizing a reduction in the product defect rate and its manufacture It aims to provide a method.

The liquid crystal display panel of the present invention includes a liquid crystal layer and a substrate for driving the liquid crystal layer by an electric signal input from the outside. The substrate includes a pixel region in which the liquid crystal layer is driven, and an external region outside the pixel region. Liquid crystal display panel having a peripheral region having a metal wiring for transmitting an electrical signal from the substrate, wherein an alignment film is formed in the pixel region and the peripheral region of the substrate, and the metal wiring and the alignment film in the peripheral region are between A transparent electrode layer covering only one side surface of the metal wiring is provided.

Since the transparent electrode layer covering only one side surface of the metal wiring layer in the peripheral region on the substrate is provided, the adhesion of the alignment film is improved, and peeling of the alignment film can be prevented.

  Hereinafter, a method for manufacturing a liquid crystal display panel according to an embodiment of the present invention will be specifically described with reference to the drawings.

<Embodiment 1>
FIG. 1 is an explanatory diagram of a configuration of a liquid crystal display device using the liquid crystal display panel of the first embodiment. In the liquid crystal display panel 50 according to the first embodiment, the liquid crystal layer 1 is sandwiched between the array substrate 2 and the color filter substrate 3 on which the color filters are formed. The color filter substrate 3 facing the array substrate 2 is sealed with a sealing material at each periphery, and the liquid crystal layer 1 is held in the sealed space. Since the liquid crystal display panel 50 of the first embodiment uses color display for the color display, the substrate facing the array substrate 2 is the color filter substrate 3, but the color filter is not necessarily required if there is a substrate sandwiching the liquid crystal layer 1. Absent. A color filter may be formed on the array substrate 2 side.

  Pixel regions 15 are arranged in a matrix on the array substrate 2 and the opposing color filter substrate 3. A drive circuit 51 that drives the liquid crystal display panel 50 based on a signal input to the image signal input unit 52 is connected to the liquid crystal display panel 50. In the pixel region 15, a predetermined voltage is applied to the liquid crystal layer 1 for each pixel according to the image signal by the drive circuit 51, and the optical characteristics of the liquid crystal layer 1 are controlled. In the case of the transmissive liquid crystal display panel 50, the array substrate 2 and the color filter substrate 3 are transparent insulating substrates such as a quartz substrate and a glass substrate. A light source 53 is installed on the back side of the liquid crystal display panel 50, and the light transmittance of the light source 53 is controlled for each pixel by a change in the optical characteristics of the liquid crystal layer 1, and an image is displayed on the front side of the pixel region 15. The A light source control circuit 54 is connected to the light source 53. For example, the light source control circuit 54 controls the light source 53 to be repeatedly turned on and off in accordance with a frame period in which an image is displayed in the pixel region 15.

  FIG. 2 is a plan view showing the configuration of the array substrate 2 of the liquid crystal display panel according to the first embodiment. The terminal portion 21 formed in the peripheral portion of the array substrate 2 is connected to a drive circuit 51 and a wiring such as a flexible cable, and a drive signal is input thereto. A seal region 16 in which a sealing material is formed is provided around the array substrate 2 and inside the terminal portion 21. Further, a pixel region 15 for displaying an image is provided inside the seal region 16, and a peripheral region 17 is provided between the seal region 16 and the pixel region 15. A scanning circuit 57 and a signal circuit 58 are formed in the peripheral region 17, and each circuit is connected to the terminal portion 21 by the metal wiring 5. The metal wiring 5 crosses the outside and the inside of the seal region 16. Further, signal lines are connected from the scanning circuit 57 and the signal circuit 58 to the pixels. The figure shows an example of a structure in which the common line C and gate line G from the scanning circuit 57 and the source line S from the signal circuit 58 are arranged to extend into the pixel. In the figure, a pixel is arranged at each position where the common line C, the gate line G, and the source line S intersect. Further, the transistor 10 is formed in the vicinity of the position where the gate line G and the source line S intersect, and one pixel electrode 8 in the pixel is connected to the source line S through the transistor 10. The gate electrode of the transistor 10 is connected to the gate line G, and a drive signal is input from the scanning circuit 57 to the gate line G at a predetermined cycle, and the voltage is applied to the one pixel electrode 8 from the signal circuit 58. Given. A common potential is applied from the common line C to the other pixel electrode 9 in the pixel, and an electric field is applied to the liquid crystal layer 1 sandwiched between the electrodes by the voltage between the one pixel electrode 8 and the other pixel electrode 9. The pixel is driven. Although the figure shows a case where the pixel has two pixel electrodes, the pixel has only the pixel electrode 8 to which a potential is applied from the source line S, and a common potential is applied to the opposing substrate side. The pixel electrode 9 may be formed. In the case of a transmissive liquid crystal display panel, a transparent conductive film such as ITO (indium tin oxide) is used for the pixel electrodes 8 and 9. The gate line G and the source line S are, for example, metal lines such as aluminum or an alloy thereof, and the transistor 10 is a TFT using thin film silicon.

  The alignment film 18 covers the entire pixel region 15 and is also formed in the peripheral region 17 outside. A part of the alignment film 18 may be formed in the seal region 16. The alignment film 18 is for aligning the liquid crystal molecules of the liquid crystal layer 1 in a specific direction in a state where no electric field is applied to the liquid crystal layer 1. Accordingly, the pixel electrodes 8 and 9, the transistor 10, the gate line G, the source line S, and the like are formed on the elements. In the peripheral region 17, the alignment film 18 is also formed on the metal wiring 5, the scanning circuit 57 and the signal circuit 58. The alignment film 18 is an organic resin layer such as polyimide, and is generally formed by coating.

  Further, the alignment action of the liquid crystal molecules of the alignment film 18 is given by the rubbing process as described above. Originally, the alignment film 18 may be only the pixel region 15. However, when the alignment process is performed by rubbing, the alignment state is difficult to stabilize at the periphery of the alignment film near the start of rubbing, so that the alignment film 18 is slightly outside the pixel area 15. The alignment film 18 is extended to the peripheral region 17. The peripheral region 17 is formed with a peripheral circuit, a metal wiring 5 for transmitting an electrical signal with the peripheral circuit of the pixel region 15 and the substrate 2 and an external circuit, and the like, and an alignment film 18 is formed thereon. Will be.

  However, it has been found that the alignment film 18 easily peels off on the metal wiring 5 in these peripheral regions 17, particularly in the vicinity of the stepped portion. On the other hand, even on the metal wiring 5, the alignment film 18 hardly peels off in the pixel region. In the pixel peripheral region 17, the pattern width of the metal wiring 5 is relatively larger than that in the pixel region 15, and it seems to be related to the fact that the alignment state is difficult to stabilize in the peripheral portion of the alignment film 18 in the vicinity of the rubbing start. It is.

  Therefore, an experiment was conducted to confirm the relationship between the base material on which the alignment film 18 is formed and the peeling of the alignment film 18 as follows. In the experiment, a Cr metal wiring layer, an Al alloy wiring layer, a SiN insulating layer, and an ITO transparent conductive film layer pattern are formed on a glass substrate, and an alignment film 18 is applied thereon, followed by a rubbing process. The alignment film 18 was checked for peeling with an optical microscope. The thickness of each layer was approximately 150 nm, and the Cr metal wiring layer, the Al alloy wiring layer, and the ITO transparent conductive film layer were formed by sputtering, and the SiN insulating layer was formed by plasma CVD. Stepped portions were formed in the respective layers by patterning the films. Further, the thickness of the alignment film 18 formed thereon was set to 70 nm. The alignment film 18 was formed by applying a polyimide resin material such as a low temperature processing alignment film Optomer AL series manufactured by JSR Corporation. Further, rubbing was performed in a direction crossing the step covered with the alignment film. The rubbing used was a rubbing cloth having a 2 to 3 mm long rayon pile wrapped around a rubbing roller. The rubbing was performed by pressing the pile against the surface of the alignment film 18 while rotating the rubbing roller. At this time, the pushing amount of the rubbing roller, which is the amount by which the pile is pushed, was set to 0.3 mm, 0.5 mm, and 0.7 mm. As the amount of pressing increases, the alignment film 18 is rubbed with a stronger force. Ten substrates were rubbed under each condition, and the presence or absence of alignment film peeling at the stepped portion was confirmed by microscopic observation.

  FIG. 3 is a table showing the results of experiments conducted on the liquid crystal display panel of the first embodiment as described above. In FIG. 3, when the rubbing process is performed on each base substrate with each rubbing push-in amount, the ratio of the number of substrates on which the separation of the alignment film is generated per 10 substrates is displayed as a fraction. At the step consisting of the Cr metal wiring layer and the Al alloy wiring layer as the base, peeling has already occurred when the push amount is 0.3 mm, and the step made of the SiN insulating layer is peeled when the push amount is 0.5 mm. did. On the other hand, at the step formed of the ITO transparent conductive film layer, no peeling occurred even when the indentation amount was 0.7 mm, indicating that the adhesion with the alignment film 18 was excellent. Further, in the flat region other than the step, no peeling of the alignment film was observed under any condition.

  As described above, the adhesion with the alignment film 18 against rubbing was better for the SiN insulating layer than the metal wiring layer such as Cr or Al, and the best for the ITO transparent conductive film layer. Since the ITO transparent conductive film layer tends to have fine irregularities on the surface, it can be estimated that the adhesion to the alignment film 18 is good.

  Therefore, the liquid crystal display panel of the first embodiment is configured to cover the metal wiring 5 in the peripheral region 17 with the ITO transparent conductive film layer 6 having a pattern along the metal wiring 5 as shown in FIG. The ITO transparent conductive film layers 6 covering the adjacent metal wires 5 are processed into separated patterns so as not to short-circuit the plurality of metal wires 5. Further, since peeling easily occurs particularly at the step portion of the side surface portion of the metal wiring 5, the pattern of the ITO transparent conductive film layer 6 is slightly wider than the pattern of the I metal wiring 5 so as to cover the step portion. Thus, the metal wiring 5 was formed so as to protrude outward from the side surface. As described above, the peeling of the alignment film 18 can be significantly reduced on the portion of the pixel peripheral region 17 where the metal wiring 5 is covered with the ITO transparent conductive film layer 6.

  FIG. 4 is a partial cross-sectional view of the liquid crystal display panel of the first embodiment. A color filter 31 and a light shielding layer 32 are formed in the pixel region 15 on the color filter substrate 3. The light shielding layer 32 is provided in a portion facing the transistor 10 and each wiring on the array substrate 1 side. The light shielding layer 32 prevents light reflected by the transistor 10 and each wiring from being mixed into display light transmitted through the color filter 31. An alignment film 19 is formed on the color filter 31 and the light shielding layer 32 of the color filter substrate 3. On the array substrate 2, the pixel electrode 8 and the transistor 10 are arranged in the pixel region 15, and the peripheral region 17 has the metal wiring 5 and the transparent electrode layer 6 that covers the side surface of the metal wiring 5. Since the metal wiring 5 is covered with the transparent electrode layer 6 in the peripheral region 17, the peeling of the alignment film 18 is greatly reduced as compared with the case where the alignment film 18 is directly formed on the metal wiring 5. The liquid crystal layer 1 is sandwiched between the array substrate 2 and the color filter substrate 3 as described above, and the substrates are bonded to each other by the sealing material 20 in the seal region 16 and the liquid crystal layer 1 is sealed.

  FIG. 5 is a partial structural diagram of the array substrate constituting the liquid crystal display panel according to the first embodiment. Unlike FIG. 4, the metal wiring 5 is inclined with respect to the side of the substrate. 5A is a top view, and FIG. 5B is a cross-sectional view taken along the dotted line AB in FIG. 5A. Also in this figure, the metal wiring 5 which is inclined with respect to the side of the substrate is covered with the transparent conductive layer 6 in the same manner as described above. Further, the metal wiring 5 may be covered with the transparent conductive layer 6 in the same manner as the wiring parallel to the side of the substrate. In particular, the side surfaces of the metal wiring 5 on which the fibers ride during the rubbing treatment and the side surfaces of the metal wiring 5 parallel to the direction in which the fibers are rubbed are easily peeled off, so that the transparent conductive layer 6 is preferably covered.

  As described above, the liquid crystal display panel according to the first embodiment includes the liquid crystal layer 1 and the array substrate 2 that drives the liquid crystal layer 1 by an electric signal input from the outside. A liquid crystal display panel having a pixel region 15 to be driven and a peripheral region 17 provided with a metal wiring 5 that transmits an electric signal from the outside outside the pixel region 15. Since the alignment film 18 is formed in the region 17 and the transparent electrode layer 6 covering the side portion of the metal wiring 5 is provided between the metal wiring 5 and the alignment film 18 in the peripheral region 17, the alignment film 18 is hardly peeled off. As a result, it is possible to prevent the peeled alignment film 18 from adhering to the pixel region 15 and deteriorating the display quality, so that a good liquid crystal display is possible.

  Hereinafter, a method for manufacturing the liquid crystal display panel of the first embodiment will be described. In a transmissive liquid crystal display panel, a pixel electrode 8 made of an ITO transparent conductive film layer is generally formed in a pixel during the process of forming the array substrate 2. Therefore, if the pixel electrode 8 made of an ITO transparent conductive film layer and the ITO transparent conductive film layer 6 covering the end of the metal wiring 5 are simultaneously formed, the process becomes simple.

  FIG. 6 is a cross-sectional view for explaining the manufacturing process of the array substrate constituting the liquid crystal display panel of the first embodiment. First, as shown in FIG. 6A, each wiring such as the transistor 10 and the source line and the metal wiring 5 and the circuit 58 in the peripheral region 17 are formed in the pixel region 15 of the array substrate 2. Next, as shown in FIG. 6B, an ITO transparent electrode film is formed, and the pixel electrode 8 and an ITO transparent conductive film layer 6 covering the end of the metal wiring 5 are formed simultaneously by patterning the film. To do. The pixel electrode 8 is connected to the source line via the transistor 10. The thickness of the ITO transparent electrode film is about 80 nm, for example. Thereafter, as shown in FIG. 6C, an alignment film 18 is formed on the pixel region 15 and the peripheral region 17 by coating. For example, a polyimide-based solution can be applied to a region inside the seal region 16 by a printing method, and heat-treated at about 200 ° C. for 1 hour to form an organic polymer alignment film having a thickness of 70 nm. . Although the entire surface of the pixel region 15 is covered with the alignment film 18, the entire surface of the peripheral region 17 may not be covered with the alignment film 18. Next, as shown in FIG. 6D, rubbing treatment is performed by rubbing the alignment film 18 with the fibers 75. As the fiber 75, for example, rayon fiber can be used. Although not shown in the figure, a liquid crystal display panel is manufactured through a process of sealing the array substrate on which the alignment films 18 and 19 are formed and the color filter substrate with a sealing material 20 and sandwiching the liquid crystal layer 1 therebetween. The In order to make the interval between the liquid crystal layers 1 constant, both substrates may be bonded to each other with a sealant through column spacers. The liquid crystal layer 1 may be injected from an injection port provided between the substrates after sealing.

  FIG. 7 is an explanatory diagram for explaining the manufacturing process of the array substrate constituting the liquid crystal display panel of the first embodiment, and is a diagram for explaining the rubbing process of FIG. 6 (d). A rubbing cloth 74 is wound around a rubbing roller 73, and fibers 75 that rub the alignment film 18 are planted on the rubbing cloth 74. The substrate on which the alignment films 18 and 19 are formed is fed toward the rubbing roller 73 while the rubbing roller 73 is rotated. The figure shows that the rubbing roller 73 is rotating with the height position fixed, and the substrate to be rubbed moves at a constant speed in the direction of the arrow and passes through the rubbing roller 73 portion. At this time, the fibers 75 formed on the rubbing roller rub the alignment film on the substrate. Further, the height positional relationship is adjusted so that the pushing amount of the rubbing roller becomes an appropriate amount.

  In the figure, a plurality of array substrates 2 are formed on one mother substrate 71 and are rubbed with the mother substrate 71 as it is. After the rubbing process, the mother substrate 71 is cut to cut out a plurality of array substrates 2. Since a plurality of array substrates 2 can be rubbed simultaneously, the processing is simple. The rubbing process of the alignment film 19 of the color filter substrate 3 can be similarly performed using a mother substrate. A pixel region 15 is formed on the mother substrate 71 every two regions of the array substrate, and an alignment film 18 is formed on the pixel region 15 and its peripheral region by coating. Wirings and pixel electrodes are formed in the pixel region 15, and an alignment film is pattern-transferred thereon according to the panel shape. Between the alignment films 18 adjacent to each other on the mother substrate 71, there are a cutting region to be separated for each substrate and a sealing region when being bonded to the counter substrate constituting the liquid crystal display panel.

  As described above, in the method of manufacturing the liquid crystal display panel according to the first embodiment, the signal line such as the source line S is formed in the pixel region 15 on the array substrate 2 and the pixel region 15 on the array substrate 2 is formed. The step of forming the metal wiring 5 in the outer peripheral region 17, the pixel electrode 8 made of an ITO transparent conductive material connected to the signal line in the pixel region 15, and the ITO transparent conductive covering the side of the metal wiring 5 in the peripheral region 17. A step of simultaneously forming the layer 6, a step of simultaneously forming the pixel electrode 8 and the ITO transparent conductive layer 6, a step of forming an alignment film 18 in the pixel region 15 and the peripheral region 17, and a rubbing treatment of the alignment film 18 And a process of performing. By covering the side portions of the metal wiring 5 with the ITO transparent conductive layer 6 before the rubbing treatment, it is possible to prevent the alignment film 18 formed thereon from being peeled off in the rubbing treatment step. Further, since the ITO transparent conductive layer 6 is formed on the pixel electrode 8 at the same time, the manufacture becomes easy.

<Embodiment 2>
FIG. 8 is a partial structural view of an array substrate constituting the liquid crystal display panel of the second embodiment. The same part as FIG. 5 of Embodiment 1 is shown. FIG. 8A is a top view, and FIG. 8B is a cross-sectional view of the dotted line CD portion of FIG. In the first embodiment, the ITO transparent conductive layer 6 covers the entire width of the metal wiring 5, and thus the both sides of the metal wiring 5 are covered with the pattern of the continuous ITO transparent conductive layer 6. The ITO transparent conductive layer 6 of the array substrate has a structure in which only the vicinity of the side surface of the metal wiring 5 is covered with the ITO transparent conductive layer 6 and most of the upper surface of the metal wiring 5 is not covered with the ITO transparent conductive layer 6. The ITO transparent conductive layer 6 covers only one side surface of the metal wiring 5 and does not cover the other side surface.

  The rubbing process is usually processed in a certain direction. Therefore, in the liquid crystal display panel of the second embodiment, the rubbing fiber covers the side surface side where the stepped portion on the side surface of the metal wiring 5 rises from the bottom to the top with the ITO transparent conductive layer 6 during the rubbing process. Although not shown in the drawing, the metal wiring 5 extending in parallel with the rubbing treatment direction is covered with the ITO transparent conductive layer 6 on both sides, but the ITO transparent conductive layer is mostly on the upper surface of the metal wiring 5. 6 so that it was not covered. The step portion where these rubbing fibers run from the bottom to the top and the side surface parallel to the rubbing process are portions that are likely to be the starting point of the alignment film, and the alignment film 18 is peeled off by covering this portion with the ITO transparent conductive layer 6. Can be prevented. In many cases, the metal wiring 5 in the peripheral region 17 is relatively wide. However, if the entire upper surface of the metal wiring 5 is covered with the ITO transparent conductive layer 6, depending on the material of the metal wiring 5, the metal wiring 5 and the ITO transparent The ITO transparent conductive layer 6 itself may be easily peeled off due to a difference in residual stress in the film with the conductive layer 6 or the like. When the ITO transparent conductive layer 6 is peeled off in the peripheral region 17, it diffuses into the pixel region 15 and degrades the display quality. In the second embodiment, the ITO transparent conductive layer 6 covering the side surface of the metal wiring 5 has a pattern covering only one side surface and does not cover most of the upper surface of the metal wiring 5. For this reason, peeling of ITO transparent conductive layer 6 itself can be prevented.

  Alternatively, the transparent conductive layer may be formed on the outside of the metal wiring 5 so that the transparent conductive layer does not run on the metal wiring so that the side of the transparent conductive layer and the side of the metal wiring are in contact with each other. Good. Even in this case, since the side surface of the metal wiring is covered with the transparent conductive layer, the alignment film is prevented from being peeled off. In addition, since the step formed on the side surface of the metal wiring is smaller than when the transparent conductive layer runs on the metal wiring, the effect of preventing peeling due to the step is great.

  The width of the ITO transparent conductive layer 6 that protrudes outside the side portion of the metal wiring 5 is preferably smaller than the width of the metal wiring 5. If the protruding portion is reduced, an increase in the width of the entire wiring is limited and an increase in parasitic capacitance is suppressed, so that deterioration of signal propagation characteristics can be prevented particularly when a high-speed signal is transmitted.

  In the embodiment described above, the portion of the ITO transparent conductive layer 6 that covers the side surface is the metal wiring 5, but the same effect can be obtained if the portion having a metal pattern is also covered with the transparent conductive layer. Is obtained. The ITO transparent conductive layer 6 may be formed on the stepped portion of the exposed metal portion of the peripheral circuit. Moreover, it is desirable to cover all the side parts of the metal wiring 5, but it is not essential to cover all the side parts as long as the main part is covered. For example, the side surface is covered with only 50% of the entire length of the metal wiring 5, and the other wiring portions may not be covered. The material of the transparent conductive layer is not limited to ITO, and may be a conductive material such as AZO (zinc oxide with aluminum added). The same effect can be obtained if the material is an electrically conductive oxide.

  In the above, the metal wiring layer in the pixel peripheral region is directly covered with the ITO transparent conductive film layer. However, when the metal wiring layer is covered with an insulating layer such as SiN, the insulating layer is formed in the pixel peripheral region. When the stepped portion is formed, it is possible to further reduce peeling of the alignment film formed thereon by covering the insulating layer with the ITO transparent conductive film layer.

  The liquid crystal display panel and the method for manufacturing the liquid crystal display panel of the present invention can prevent peeling of the alignment layer in the liquid crystal display panel, so that a liquid crystal display device with improved yield and good display quality can be realized.

It is explanatory drawing of the structure of the liquid crystal display device using the liquid crystal display panel of this Embodiment 1. FIG. 3 is a plan view showing a configuration of an array substrate 2 of the liquid crystal display panel according to Embodiment 1. FIG. 6 is a table showing results of experiments conducted on the liquid crystal display panel of the first embodiment. FIG. 3 is a partial cross-sectional view of the liquid crystal display panel of the first embodiment. 2 is a partial structural diagram of an array substrate constituting the liquid crystal display panel of Embodiment 1. FIG. It is sectional drawing explaining the manufacturing process of the array substrate which comprises the liquid crystal display panel of this Embodiment 1. FIG. It is explanatory drawing explaining the manufacture of the array substrate which comprises the liquid crystal display panel of this Embodiment 1. FIG. It is a partial structure figure of the array substrate which comprises the liquid crystal display panel of this Embodiment 2. FIG.

Explanation of symbols

1 liquid crystal layer, 2 array substrate, 3 color filter substrate, 5 metal wiring, 6 ITO transparent electrode layer, 8 and 9 pixel electrode, 10 transistor, 15 pixel region, 16 seal region, 17 peripheral region, 18, 19 alignment film, 20 sealing material, 21 terminal section, 31 color filter, 32 light shielding layer, 50 liquid crystal display panel, 51 drive circuit, 52 image signal input section, 53 light source, 54 light source control circuit, 57 scanning circuit, 58 signal circuit, 71 mother board 73 rubbing roller, 74 rubbing cloth, 75 fibers, S source line, C common line, G gate line.

Claims (2)

A liquid crystal layer and a substrate for driving the liquid crystal layer by an electric signal input from the outside, the substrate being a pixel region in which the liquid crystal layer is driven, and an electric signal from the outside outside the pixel region Liquid crystal display panel having a peripheral region having a metal wiring for transmitting the liquid crystal, wherein an alignment film is formed in the pixel region and the peripheral region of the substrate, and the metal wiring and the alignment film in the peripheral region A liquid crystal display panel having a transparent electrode layer covering only one side surface of the metal wiring therebetween. A liquid crystal layer and a substrate for driving the liquid crystal layer by an electric signal input from the outside, the substrate being a pixel region in which the liquid crystal layer is driven, and an electric signal from the outside outside the pixel region A liquid crystal display panel manufacturing method having a peripheral region with metal wiring for transmitting
Forming a signal line in the pixel region on the substrate; forming the metal wiring in a peripheral region outside the pixel region on the substrate; and transparent connecting to the signal line in the pixel region After the step of simultaneously forming the pixel electrode made of a conductive material and the transparent conductive layer covering only one side surface of the metal wiring in the peripheral region, and the step of simultaneously forming the pixel electrode and the transparent conductive layer A method for manufacturing a liquid crystal display panel, comprising: a step of forming an alignment film in a pixel region and the peripheral region; and a step of rubbing the alignment film.

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