JPH0289027A - liquid crystal display device - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] Regarding a liquid crystal display device, the resistance of the bus line is reduced to enable driving from one side of the bus line, and there is no restriction on the number of disconnections in the bus line that can be repaired. For the purpose of increasing reliability, a plurality of pixel electrodes are arranged in a matrix on the surface of one side of a pair of opposing insulating substrates, and a plurality of pixel electrodes corresponding to the rows or columns of the plurality of pixel electrodes are provided. A blank pattern made of a striped non-transparent conductive film for shielding the periphery of each pixel electrode from light is provided on the surface of the other transparent substrate. Corresponding to the bus line in at least one direction, connection ends are provided at both ends of the blank pattern and at both ends of the corresponding bus line so as to face each other, and the mutually opposing connection ends can be electrically connected to each other. Configured.

To achieve this, it is necessary to lower the bus line resistance so that the bus line can be driven on one side.

It is also necessary to be able to repair defects such as disconnections in a short time and with high reliability.

[Industrial application field]

The present invention relates to a liquid crystal display device, and more particularly to the structure of an active matrix liquid crystal display device that enables repair of disconnections in bus lines.

In recent years, thin film transistor-driven liquid crystal display devices are desired to have large screens and high image quality. Therefore, there is a trend of increasing the number of bus lines and TPT elements, but with this, various defects are also increasing.

The main defects are gate-drain short circuits and bus line breaks, and for short circuits a redundant configuration is used in which two elements are used in one pixel.

On the other hand, in order to make the screen larger, more compact, and lower in price, it is necessary to reduce the number of drive circuits. [Prior Art] The main parts of a conventional active matrix liquid crystal display device are shown in FIG.

In the liquid crystal display device shown in the figure, the bus line 51 is
This is an example in which drive circuits 52 are provided on both sides.

In this configuration, since the bus line 51 is driven from both sides, even if the bus line 51 is disconnected, the pixels on this bus line 51 will not become inoperable.

However, since two sets of drive circuits 52 are provided, the manufacturing cost becomes high and the display unit becomes large.

FIG. 5 is a diagram showing another conventional configuration, in which a disconnected bus line 51
This is an example in which a redundant wiring 53 is provided for repairing.

With this configuration, even if a break occurs in the bus line 51'', the break can be repaired by connecting both ends of the broken bus line 51' to the redundant wiring 53 using wire bonding. be.

However, the number of redundant wirings 53 that can be installed is limited to about 1 or 2, and therefore, if there are 1 or 2 disconnections, it can be repaired, but if there are many disconnections, it is impossible to repair. I can't use the LCD panel.

[Problem to be solved by the invention]

As mentioned above, in the configuration of a conventional liquid crystal display device, in order to avoid making the liquid crystal panel unnecessarily large, the area other than the pixel part cannot be made large, so there is a limit to the number of redundant wiring lines. If there are many breaks in the bus line,
The panel was beyond repair. Furthermore, even if the panels are repaired, there are problems in that the reliability of the repair is poor, such as wires coming off when a shock is applied to the panel, and that the repair takes a long time.

Furthermore, since the number of drive circuits is 2Mi, there is a limit to the miniaturization of the liquid crystal display device.

An object of the present invention is to reduce the resistance of a bus line so as to enable driving from one side of the bus line, and to eliminate restrictions on the number of disconnections in the bus line that can be repaired, thereby increasing the reliability of repair.

[Means to solve the problem]

In the present invention, a striped black pattern made of a non-transparent conductive material is arranged in parallel to at least one type of bus line, corresponding to each of the bus lines.

[For production]

The above black patterns are arranged parallel to each other in correspondence with each of the predetermined bus lines, so by connecting the corresponding black patterns and both ends of the bus line, both ends of the bus line are short-circuited by the black pattern. Ru.

Therefore, the blank pattern can be used to repair a disconnection in a bus line or to arrange a drive circuit on only one side.

〔Example〕 The present invention will be explained below with reference to Examples.

FIG. 1 and FIG. 2 are diagrams showing one embodiment of the present invention.
The figure is a plan view of the main part, and FIG. 2 is a sectional view of the main part, and the present embodiment will be described below with reference to both figures.

In the figure, l is a striped black pattern made of a non-transparent conductive film such as a Cr (chromium) film, 2 is a drain lot line, 3 is a pixel electrode, and 21.22
is a transparent insulating substrate.

This embodiment is an example in which a striped black pattern 1 is formed in a position parallel to a drain bus line 2 and covering a row of pixel electrodes 3 connected to the same drain bus line 2. It goes without saying that the black pattern 1 is open just above each pixel electrode 3.

The drain bus line 2 is formed on a TPT substrate 5 on which each pixel electrode 3 and a thin film transistor for driving it are disposed on a transparent insulating substrate 21, and the black pattern l is formed on the TPT substrate 5. It was formed on the surface facing the TFT substrate 5 of the transparent insulating substrate 22, which faces the TFT substrate 5 with the liquid crystal 4 interposed therebetween. In addition to the black pattern 1, a color filter 31 is also provided on the transparent insulating substrate 22.
．． Acrylic resin film 32. ITO film 3 forming a counter electrode
3 and the like are formed to constitute the counter substrate 6.

In this embodiment, the black pattern 1 and the drain bus line 2 are arranged so that one is located in the gap between the other. That is, the arrangement is such that the gap between two adjacent black patterns 1 is directly above the drain bus line 2. It is desirable that this gap be as small as possible, and in this example, it was set to approximately 5 μm.

Further, connection ends 8.9 for connecting the two are provided at both ends of each black pattern 1 and each drain bus line 2 so as to face each other vertically.

As usual, spacers lO having a diameter of about 5 μm are scattered between the TPT substrate 5 and the counter substrate 6 to define the distance between the two substrates, that is, the thickness of the liquid crystal 4. This liquid crystal 4 is a TFT substrate 5
and a counter substrate 6 are sealed with a sealant 7.

In this embodiment configured in this way, the drain bus line 2
If a disconnection occurs, as shown in FIG. 2, the connection ends 9 at both ends of the disconnected drain bus line 2 and the connection end 8 of the black pattern 1 opposite thereto are melted with a laser shot. Connecting. As a result, the disconnection in the drain bus line 2 is repaired.

Moreover, in the configuration of this embodiment, the same number of blank patterns l can be provided corresponding to each drain bus line 2, so even if many disconnections of the drain bus line 2 occur,
All can be repaired.

Furthermore, regardless of whether or not the drain bus line 2 is disconnected,
By connecting all the drain bus lines 2 and the corresponding black patterns 1, the resistance of the drain bus lines 2 can be lowered.

Next, a modification of the present invention will be explained with reference to FIGS. 3(a) and 3(b). FIG. The same parts are given the same reference numerals.

This modification is an example in which black patterns 1 are arranged in parallel to the gate bus line 11, and each black pattern 1 is formed so as to cover all the pixel electrodes 3 connected to the same gate bus line 11. However, as in the previous embodiment, an opening is provided on each pixel electrode 3 so that the black pattern 1 does not exist.

At both ends of the black button gate bus line 11, connection ends 8 and 12 are arranged facing each other, and the TPT substrate 5 and the counter substrate 6 are connected with a sealant 7 at the positions of the connection ends 8 and 12.
Paste together.

In this modification, a mixture of a normal sealant and an anisotropic conductive substance is used as the sealant 7. As a result, the connection ends 8 and 12 of the black pattern 1 and the gate bus line 11, which are vertically opposed to each other, are electrically connected via the sealant 7. Short-circuited by -l. Therefore, even if a disconnection occurs in the gate bus line 11 itself, it will not be a disconnection fault in the gate bus line 11.

Further, since both ends of the gate bus line 11 are short-circuited as described above, the signal applied to the gate bus line 11 is inputted to both sides. Therefore, even if the driving circuit is provided only on one side, it is effectively possible to drive both sides, so it is only necessary to provide the driving circuit on one side, and the liquid crystal display device can be made smaller.

In the above embodiment and modification example, an example was explained in which the black pattern l was arranged corresponding to one bus line.
By laminating the black patterns 1 with an insulating film interposed therebetween, it is possible to arrange the black patterns 1 corresponding to two or more types of bus lines.

The material for the black pattern 1 is not limited to the Cr film used in the above embodiment, but may also be an A1 film with low resistivity.

As explained above, according to the present invention, it is possible to eliminate restrictions on the number of disconnections that can be repaired by simply changing the structure of the black pattern on the opposing substrate side and without changing other processes, thereby improving the production of liquid crystal display devices. Not only is the yield improved, but the resistance of the bus line can be reduced, and the liquid crystal display device can be driven on one side, resulting in cost reduction and downsizing.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the configuration of one embodiment of the present invention, FIG. 2 is an explanatory diagram of disconnection repair in the above-mentioned embodiment, FIGS. 3(a) and (b) are detailed explanatory diagrams of the present invention, and FIG. 4 and FIG. 5 are diagrams explaining problems in the conventional technology. In the figure, l is a black pattern, 2 is a drain bus line, 3 is a pixel electrode, 4 is a liquid crystal, 5 is a TFT substrate, 6
is the opposing substrate, 7 is the sealant, 8゜ [Effect of the invention] Incomplete clear-historical misconception to the false bird' Sculpture map Figure 1 (b) /i, ues≦I Shape I: J Tla8 M tsutsumi floor/1
m title center α light threshold chart

Claims (2)

[Claims] (1) A plurality of pixel electrodes (3) arranged in a matrix on the surface of one side substrate (21) of a pair of opposing insulating substrates (21, 22); ) multiple bus lines arranged corresponding to the rows or columns of (
2, 11), and on the surface of the transparent other side substrate (22), a black pattern ( Connecting ends (8, 9) are connected to both ends of the black pattern (1) and to both ends of the corresponding bus line (2) corresponding to the at least one direction bus line (2).
) are arranged to face each other, and the mutually facing connection ends (8, 9) are configured to be electrically connectable to each other. (2) The pair of insulating substrates (21, 22) are bonded together at the mutually opposing connection ends (8, 9, 12) using a sealant mixed with an anisotropic conductive material. The liquid crystal display device according to claim 1.