JP5072518B2 - Matrix array substrate and display device - Google Patents

Description

  The present invention relates to a wiring shape (terminal shape) of a matrix array substrate.

  The liquid crystal display device has a liquid crystal panel in which a liquid crystal material is sandwiched between a pair of substrates, and one substrate constituting the liquid crystal panel is a matrix in which switching elements are formed in a matrix on the substrate. It is an array substrate. The pixel electrodes formed on the matrix array substrate are connected to adjacent pixel electrodes, respectively, and control the voltage level of the pixel electrodes based on an electric signal supplied from an external signal supply unit.

  For example, in an active matrix driving display panel in which each pixel is provided with a switching element such as a thin film transistor (TFT), the signal wiring, the scanning wiring and the switching element are arranged in one matrix array of two substrates. Formed on a substrate. A large number of scanning wirings are arranged so as to be parallel to each other, and a large number of signal wirings are arranged so as to cross the scanning wirings and be parallel to each other. A switching element is formed at the intersection of the scanning wiring and the signal wiring. The scanning electrode is connected to the scanning wiring, the signal electrode is connected to the signal wiring, the drain electrode is connected to the pixel electrode, and the switching element and the pixel electrode constitute a pixel. Is done.

  In the manufacture of such a display device, the polyimide film (alignment film) applied on the substrate is clothed for the purpose of aligning the liquid crystal base material when the two substrates are superimposed and liquid crystal is injected. A rubbing process such as rubbing is performed. In this process, a very large static electricity is generated, so that an overvoltage is applied to the scanning wiring and the signal wiring, which may cause a static electricity failure due to damage to the switching element.

  Therefore, as a measure to prevent such static electricity defects, it is common to provide short wiring that short-circuits all signal wiring and scanning wiring to increase the electric capacity to disperse and reduce damage to the switching element. Has been done. The short wiring is removed before a process in which the short wiring needs to be removed, such as an image inspection process.

  Therefore, the short wiring is provided at the end of the substrate that can be easily removed, and the shape of the short wiring is an annular shape formed on the outside of a large number of external electrodes that are electrically connected to the wiring pattern through the contact holes. The signal wiring and the scanning wiring are connected to the short wiring.

  However, in the conventional display panel, in the step of removing the short wiring, the wiring pattern extended from the contact hole toward the short wiring at the end of the substrate is peeled off, and the peeling pattern shorts the adjacent terminals. Alternatively, the peeled peeling pattern may short-circuit another terminal. As a result, problems such as display defects such as line defects or damage to the inspection drive circuit occur.

  For example, the chamfering process for removing the short wiring is performed by chamfering the edge of the display panel side surface with a polishing member. Further, the cleaning of the external electrode is performed on the main surface side of the display panel using a cleaning member. Therefore, in these steps, an external force is applied to the short wiring, and the wiring pattern extending from the contact hole toward the short wiring at the end of the substrate is peeled off by the external force.

  Further, after the short wiring is chamfered, the wiring pattern extended from the contact hole at the chamfered end portion toward the short wiring at the substrate end may be lifted from the substrate and turned up. This situation is considered to be due to the fact that the wiring pattern is formed in a state where the film stress is applied toward the display screen side (pixel side) during the film formation in the array process.

  In order to solve this problem, the shape of the wiring pattern extended from the contact hole toward the short wiring at the end of the substrate is set to a tapered shape in which the wiring width is narrowed toward the end of the substrate, There is a method of dispersing stress applied to a wiring pattern (see Patent Document 1). With such a configuration, it is possible to disperse the stress applied to the wiring pattern, and thus it is possible to suppress peeling of the narrowed wiring pattern.

  In addition, when the wiring pattern is formed in a constricted shape in which the distance from the substrate end of the narrowed wiring portion is smaller than the interval between the wiring patterns, the wiring pattern is peeled off from the short end of the substrate. By separating the pattern from the wiring pattern at the constricted portion, the separation pattern can be made smaller than the interval between the wiring patterns (see Patent Document 1).

Japanese Patent Laying-Open No. 2004-252276 (FIGS. 1 and 8)

  In the conventional display panel disclosed in Patent Document 1, the wiring pattern extending from the contact hole toward the short wiring at the end of the substrate has a tapered shape in which the wiring width is narrowed toward the end of the substrate. It has the shape of However, since the wiring pattern width is narrowed at the peeling start point (on the side of the substrate) of this wiring pattern, the stress cannot be sufficiently distributed with respect to external stresses such as chamfering and cutting processes. There is a possibility that the wiring pattern is peeled off. As a result, the peeling pattern of the wiring pattern is short-circuited with an adjacent terminal, and this short-circuit phenomenon can contribute to a decrease in yield.

  The present invention has been made to overcome the above-described problems, and an object of the present invention is to extend the wiring from the contact hole toward the short wiring at the end of the substrate in the manufacture of the display device. It is in the point which suppresses the short circuit between terminals which generate | occur | produces by peeling of a pattern, and improves the manufacture yield of a display panel. Another object of the present invention is to improve the manufacturing yield of the display device constituted by the display panel.

The subject of the present invention is a matrix array substrate in which a plurality of switching elements are formed in a matrix, and a plurality of wirings for drawing out the electrodes of the plurality of switching elements to the periphery of the substrate. Each of the plurality of wirings includes a plurality of extension wirings extending from an end portion of the contact hole in contact with a bottom surface of the contact hole toward an end portion of the substrate, and the plurality of extension wires. each wire has a plurality of blocks to be continuous along the extending direction, wherein each of the plurality of blocks, the end portions of the wiring extension lines corresponding to those 該Bu lock led of the block portion dimensionally narrowed, the and the block portion of the substrate end portion side and dimensionally vast reduction, with respect to the block mutually adjacent, the vast reduction was blanking the one of the blocks block A click portion, the said narrowing block portion of the other of said blocks, characterized in that it is continuously formed.

  Hereinafter, various embodiments of the subject of the present invention will be described in detail along with the effects and advantages thereof with reference to the accompanying drawings.

According to the subject matter of the present invention, it at the chamfering step and the like, to break even when the extension wire is peeled off by external stress, a single block of actively extended wiring portions of the constriction from the extension line Thus, since the dimension of the peeled peeling pattern is set to be smaller than the distance between the mounting terminals (distance between the wirings), a short circuit between the terminals can be suppressed.

(Embodiment 1)
Hereinafter, the configuration of the display device according to the present embodiment will be described. Here, a TFT liquid crystal display device is shown as a display device to which the present invention is applied.

  FIG. 1 is a plan view showing a configuration of a display panel (liquid crystal panel) mounted on a TFT display device. However, FIG. 1 shows the display panel in a stage before the short wiring 8 is removed. Regarding this display panel, the chamfering area 10b including the short wiring 8 shown in FIG. 1 is removed by a chamfering process or the like before the image inspection process.

  The display panel includes a first substrate (corresponding to a matrix array substrate) 1 and a second substrate 2 that face each other and sandwich a liquid crystal as a display material. On the first substrate 1, a plurality of signal wirings 5a arranged in parallel along the vertical direction of the drawing and a plurality of scanning lines 5b arranged in parallel along the horizontal direction of the drawing are formed. Has been. The signal wiring 5a and the scanning wiring 5b are formed so as to intersect with each other in the display area 10a. At each of the intersections, a TFT (not shown) and a pixel electrode (not shown) are used as switching elements. Not shown), and each intersection constitutes a pixel. By driving the TFT of the switching element, the orientation of the liquid crystal is controlled and an image is displayed on the display panel.

  As shown in FIG. 1, the first substrate 1 is made larger than the second substrate 2, and each signal wiring 5a and each scanning wiring 5b are respectively a wiring pattern of the signal extension wiring 9a and a scanning extension wiring 9b. This wiring pattern is extended from the outside of the second substrate 2 to the short wiring 8 formed in the peripheral portion of the first substrate 1. An insulating film (not shown) is formed on the wiring pattern of each signal line 5a, each signal extension line 9a, each scanning line 5b, and each scanning extension line 9b. In addition, on the upper surface of the signal wiring 5a, a signal wiring contact hole 7a that is electrically connected to the signal extension wiring 9a that is an extension wiring of the signal wiring 5a is provided through the insulating film. The signal wiring contact hole 7a is completely filled with a conductive material (not shown). A large number of signal wiring external electrodes (not shown) that are electrically connected to the corresponding signal extension wirings 9a through the signal wiring contact holes 7a are formed on the insulating film. Similarly, a scanning wiring contact hole 7b that is electrically connected to the scanning extension wiring 9b that is an extension wiring of the scanning wiring 5b is also provided on the upper surface of the scanning wiring 5b so as to penetrate the insulating film. The scanning wiring contact hole 7b is completely filled with a conductive material (not shown). A large number of scanning wiring external electrodes (not shown) that are electrically connected to the corresponding scanning extension wirings 9b through the scanning wiring contact holes 7b are formed on the insulating film. Therefore, each signal wiring contact hole 7a and each scanning wiring contact hole 7b have a function for connecting an external driving circuit to the display panel.

  Each signal wiring 5a and each scanning wiring 5b are electrically connected to the short wiring 8 at their ends with the signal extension wiring 9a and the scanning extension wiring 9b interposed therebetween. In this way, by electrically connecting each signal wiring 5a and each scanning wiring 5b to the short wiring 8, the TFT of the switching element of each pixel is protected from static electricity or the like. Here, as illustrated in FIG. 1, the short wiring 8 that needs to be removed before the image inspection is performed so that the short wiring 8 can be easily removed when the end portion of the first substrate 1 is chamfered. The first substrate 1 is formed in the chamfered area 10b at the end (peripheral portion).

  In the following, for convenience of description, each signal wiring 5a and each scanning wiring 5b are collectively referred to as “wiring 5”, and when simply referred to as “wiring 5”, each of the signal wiring 5a and each scanning wiring 5b is referred to. Shall point to. Similarly, each signal wiring contact hole 7a and each scanning wiring contact hole 7b are simply referred to as “contact hole 7”. Further, each signal extension wiring 9a extending from the end of the corresponding signal wiring 5a portion that is in electrical contact with the bottom surface of each signal wiring contact hole 7a toward the short wiring 8, and each scanning wiring contact Each scanning line length wiring 9b extending from the end portion of the corresponding scanning wiring 5b in electrical contact with the bottom surface of the hole 7b toward the short wiring 8 is collectively referred to as “extension wiring 9”.

  FIG. 2 is an enlarged plan view showing a configuration in the vicinity of the chamfered area 10b at the end of the display panel in FIG. 1 before removing the chamfered area 10b. As shown in FIG. 2, the extended wires 9 drawn out from the ends of the wires 5 extended into the chamfered area 10b are within a certain standard range when the chamfered area 10b is removed. Is removed. In FIG. 2, each extended wiring 9 is extended until reaching the short wiring 8 at the end of the first substrate 1, and is formed continuously at a predetermined interval and at an acute angle. A shape having a plurality of constrictions 12 is formed.

That is, in each extension wiring 9, the constriction 12 having an acute angle exists at a predetermined interval from the end of each wiring 5 to the short wiring 8 in the chamfered area 10b. each extension wiring 9 is connected, it is formed by a plurality of blocks 11 which continuously connected. Moreover, each block 11, with respect to the horizontal direction orthogonal to the extending direction of the extension wiring 9 (vertical direction), short line 8 side portion has vast reduction, the contact hole 7 portion conversely from short wire 8 portion Has a narrowed shape. That is, the constriction 12 is formed so as to go to a continuous portion between adjacent blocks 11.

When the extension wiring 9 is peeled off due to an impact when chamfering the chamfered area 10b, the extension wiring 9 is pulled to the contact hole 7 side and peeled off. Therefore, the stress applied to the film constituting each extension wiring 9 is It is estimated that it is working toward the display area 10a. Therefore, with respect to the shape of the block 11, by short wire 8 portion is vast reduction than the contact hole 7 portion, the stress applied to the extension wiring 9 at the chamfered dispersed, and the film constituting the extension wiring 9 Is set to be larger by widening the portion on the short wiring 8 side, so that peeling of each extended wiring 9 during chamfering is suppressed.

FIG. 3 is a plan view showing the configuration of the area near the chamfered area 10b at the edge of the display panel shown in FIG. 2 after the chamfered area 10b is removed. As described above, each of the extension wiring 9 is distraction formed me than a continuous form of lube lock 11 having a two or more of the above shapes. Therefore, when the chamfering area 10b is removed in the chamfering operation, the extension wiring 9 that has been peeled off by the impact during chamfering from the chamfered end portion 13 to the extension wiring 9 (hereinafter, the extension wiring 9 that has been peeled off during chamfering). refers to a moiety as "peel line 15".) for, by broken aggressively than 12 parts of the constriction between the blocks 11 to each other, peel the corresponding block 11 the release wire 15 in extension wiring 9 As an example, the size of the peeling wiring 15 is made smaller than the interval between the adjacent wirings 5 to prevent a short circuit between the adjacent wirings 5.

Moreover, even if the position of the chamfered end 13 is changed due to the variation of the chamfering amount of the chamfered area 10b, having the above structure, by continuous formation of block 11, form an acute angle between the block 11 to each other part actively block 11 of the constriction 12 is formed so as to be broken at the extension wiring 9.

In other words, the shape of each extension wire 9 up to the short wire 8 is set to a configuration in which adjacent blocks 11 each having an acute-angled constriction 12 are formed continuously to form a chamfered end portion 13. and changes in the dispersion of the chamfering amount position of the impact by peeling of the extension wiring 9 at the time of chamfering, and, even when the peeling wire 15 occurs, extending at the 12 part of the constriction between certain lube lock 11 between The wiring 9 is actively broken, and the size of the separation wiring 15 is made smaller than the interval between the adjacent wirings 5 to prevent a short circuit between the adjacent wirings 5 or between the adjacent extension wirings 9.

Figure 4 is illustrated in Figure 2 and Figure 3 is a plan view describing the dimensional relationship of each block 11 forming the respective extension wirings 9 are successively formed along the extending direction of each extension wiring 9. As shown in FIG. 4, the vertical dimension A along the extending direction of each block 11, the shape of up short wires 8 of each extension wiring 9, when formed by continuously forming the block 11, one it is a longitudinal distance of the block 11. Further, the lateral maximum dimension B of each block 11 in FIG. 4, the shape of up short wires 8 of each extension wiring 9, when formed by continuously forming the block 11, the lateral one block 11 This is the maximum distance in the extending direction of each extension wire 9 or the direction orthogonal to the vertical direction. In this embodiment, one block shape longitudinal dimension A及beauty 1 block shape maximum lateral dimension B of this are both than the distance between the wires of Fig. 4 E (the distance between adjacent wire 5 of FIG. 2 and FIG. 3) Is also set and formed small (A <E, B <E).

1 block-shaped transverse maximum dimension B is the shape to the short wiring 8 of extension wiring 9 at block 11 when the continuous form, and the dimensions of the end portion of the shape of the individual blocks 11 (maximum width), the following to be continuously formed, so as to overlap with the first part in the form of a block of block 11 (minimum width), continuously form a block 11.

Transverse minimum dimension C of a block shape in FIG. 4, the shape of up short wires 8 of each extension wiring 9, when the continuously formed in block 11, the minimum distance in the lateral direction of each block 11. Transverse minimum dimension C of a block shape of this, from the problem of static electricity or the like to the display panel, is formed by the minimum width having the function of a short wire to protect the TFT switching elements. When the distance of the horizontal minimum dimension C of the one- block shape is smaller, the chamfered end portion is removed when the extension wiring 9 is peeled off due to the impact applied to the extension wiring 9 at the chamfered end portion 13 (FIG. 3) at the time of chamfering. the lube lock 11 be located on the 13 side made easier to break the extension wiring 9.

The constriction angle D shown in FIG. 4 forms a constriction angle D at an acute angle of more than 90 degrees because the disconnection is promoted as the sharper the angle is. This setting by the impact applied to the extension wiring 9 at the chamfered end 13 at the time of chamfering, when the extension wire 9 is peeled off, to break the lube lock 11 to position the chamfered end portion 13 side from the extension wiring 9 It can be made easier.

In FIG. 4, the longitudinal dimension A of a block shape of block 11 is set smaller than the distance E between adjacent wires 5, the block 11, part of the wiring 5 directly under the contact hole 7 from the end to reach the short wire 8, in the same interval a, in order to continuously form the block 11, when carrying out the chamfering at the chamfering, by counting the number of blocks 11, a magnifying glass or the like The chamfering amount can be easily measured, and the working efficiency can be improved because no length measuring device or the like is used.

As described above, according to the present embodiment, the neck angle D is an acute angle, the width of the contact hole 7 side portion is narrower than the width of the short wiring 8 side portion, and (A <E , B has a dimensional relationship of <E), block 11 that along the longitudinal direction continuously formed, since forms an extension wire 9 reaching the short wire 8, the chamfered end of the time of chamfering the impact applied to the extension wiring 9 in 13, be peeled extension wiring 9, during its peeling, to break from the chamfered edge portion 13 of the block 11 easily extension wiring 9 at the portion of the constriction 12 it is possible, that the dimensions of the broken blocks 11 is smaller than the distance between the terminals E result, block 11 that is fractured, obtained an advantage that a less likely cause short and between extension wiring 9 short between terminals 5 It is done.

(Embodiment 2)
FIG. 5 is an enlarged plan view showing the vicinity of the chamfering area 10b at the end of the display panel included in the display device according to the present embodiment. 5, elements having the same functions as those shown in FIGS. 1 to 4 are denoted by the same reference numerals. The structure of a display device according to this embodiment, as compared with Embodiment 1 (FIGS. 2-4), unlike the shape of the block 11, the other points are the same.

However, unlike the case shown in FIG. 4, in this embodiment, 1 block shape maximum lateral portion of the dimension B is the direction of the influence of the cut angle D of the constriction 12 referred to below, next to the one block shapes back and forth relative to the portion of the minimum dimension C, the dimensions of the portion located on the short wire 8 side than the lateral minimum dimension part C of a block shape, corresponding to one block-shaped transverse maximum dimension B.

In the structure of FIG. 5 (a), in between the blocks 11 to each other, the angle D of the constriction 12 is formed so as become more acute angle towards the contact hole 7 side. In such a structure, than the angle D of Okerukubire 12 in FIG. 4, when the extension wiring 9 by impact applied to extension wiring 9 at the chamfered end 13 at the time of chamfering is peeled, block 11 and a fracture between each other to further urge direction, since the constriction 12 is facing, made easier to break than between the block 11 between the first embodiment. Thereby, the short circuit between terminals between the wiring 5 and the extension wiring 9 can be prevented more effectively.

Structure of FIG. 5 (b), with respect to block 11 of FIG. 5 (a), the angle D of the constriction 12, is a modification of the case are formed so as become more acute angle towards the contact hole 7 side . As shown in FIG. 5B, the direction of the angle D of the constriction 12 is set toward the contact hole 7 side. In the case of FIG. 5B, the same effect as in the case of FIG.

In this way, when the extension wiring 9 is peeled off by the impact applied to the extension wiring 9 at the chamfered end portion 13 at the time of chamfering, the dimension of the peeling wiring 15 is the distance between the wirings 5 (the distance between the wirings in FIG. 4). E) is formed smaller than the extension wiring 9 extending up to the short wiring 8 of the substrate end portion, and vast reduction is short wiring 8 side portion, the contact hole 7 portion conversely is narrowed, the block 11 if constituted by successive formation, the individual blocks 11 may be shaped as shown in (a) or (b) in FIG.

(Embodiment 3)
FIG. 6 is an enlarged plan view showing a configuration in the vicinity of the chamfering area 10b at the end of the display panel included in the display device according to the present embodiment. Also in FIG. 6, the same reference numerals are assigned to components having the same functions as the components shown in FIGS. The structure of a display device according to this embodiment, as compared with Embodiment 1 (FIGS. 2-4), unlike the shape of the block 11, the other points are the same.

As shown in FIG. 6, each block 11 is large of short wire 8 portion, and a pattern where the contact hole 7 portion is narrowed is made of a shape formed me than an arc shape . By such a structure, the 12 parts of the constriction between the blocks 11 to each other is made more thinner. Therefore, the structure of FIG. 6, when the extension wiring 9 by impact applied to extension wiring 9 at the chamfered end 13 at the chamfer (Fig. 3) is peeled off, while the block 11 between the chamfered edge portion 13 side It has a shape that further promotes breakage.

In this way, when the extension wiring 9 is peeled off by the impact applied to the extension wiring 9 at the chamfered end portion 13 (FIG. 3) at the time of chamfering, the dimension of the separation wiring 15 is set to the distance between the wirings 5 (FIG. 4). is formed smaller than the distance E) between the lines, the extension wiring 9 extending up to the short wiring 8 of the substrate end portion, short wire 8 portion is large reduction, and a contact hole 7 portion is narrowed, block if configuring it than in the continuous formation of 11 individual blocks 11 may be a block 11 formed by an arc such as shown in FIG.

(Appendix)
While the embodiments of the present invention have been disclosed and described in detail above, the above description exemplifies aspects to which the present invention can be applied, and the present invention is not limited thereto. In other words, various modifications and variations to the described aspects can be considered without departing from the scope of the present invention.

  For example, the matrix array substrate according to the present invention can be applied to another FPD such as an organic EL display.

  The present invention is suitable for application to, for example, a liquid crystal display device.

3 is a plan view of a display panel mounted on the display device according to Embodiment 1. FIG. 3 is an enlarged view of the vicinity of a chamfered area at an end portion of the display panel according to Embodiment 1. FIG. 3 is an enlarged view of the vicinity of a chamfered area at an end portion of the display panel according to Embodiment 1. FIG. FIG. 3 is a diagram illustrating dimensions of components in the vicinity of a chamfered area at a display panel end according to the first embodiment. FIG. 10 is an enlarged view of the vicinity of a chamfered area at a display panel end according to a second embodiment. FIG. 10 is an enlarged view of the vicinity of a chamfer area at a display panel end according to a third embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st board | substrate, 2nd board | substrate, 5a signal wiring, 5b scanning wiring, 5 wiring, 7a signal wiring contact hole, 7b scanning wiring contact hole, 7 contact hole, 8 short wiring, 9a signal extension wiring, 9b scanning extension wiring , 9 extension wiring, 10a display area, 10b chamfered area, 11 block, 12 waist, 13 chamfered end 15 peeled wire, the longitudinal dimension of a 1 block, maximum lateral dimension of the B 1 block, the horizontal minimum C 1 block Dimensions, D Constriction angle, E Distance between wires.

Claims (5)

A substrate on which a plurality of switching elements are formed in a matrix;
A plurality of wirings for extracting each electrode of the plurality of switching elements to the periphery of the substrate;
Within each of the plurality of wirings, a plurality of extended wirings are extended from the end of the portion that contacts the bottom surface of the contact hole toward the end of the substrate,
Wherein each of the plurality of extension lines has a plurality of blocks to be continuous along the extending direction,
Each of the plurality of blocks is a block portions of the end portions of the wiring extension lines corresponding to those 該Bu lock led to dimensionally narrowing, dimensionally large block portion of the substrate end portion It has been of,
Regarding the adjacent blocks, the enlarged block portion of one of the blocks and the narrowed block portion of the other block are formed continuously ,
Matrix array substrate. The matrix array substrate according to claim 1, wherein
Than the distance between the maximum width of any and the block portion of the substrate end portion side of each of said blocks of adjacent intervals constricted toward the contiguous portion of the block between mutually are adjacent among both of said plurality of wiring lines It is characterized by being small,
Matrix array substrate. The matrix array substrate according to claim 1 or 2,
The constriction angle toward the continuous part of the adjacent blocks is an acute angle,
Matrix array substrate. A matrix array substrate according to any one of claims 1 to 3,
Wherein an interval constricted towards successive portions of the block that have in the neighboring are the same,
Matrix array substrate. 5. A display panel comprising the matrix array substrate according to claim 1 as one substrate and the one substrate and the other substrate bonded to each other.
Display device.

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