JPH09101531A - Electrode substrate for liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the electrode substrate for liquid crystal display device which can prevent the dielectric breakdown in the cell production process. SOLUTION: Plural display electrodes 3 which are arranged in parallel on the inside of outer edges of cell, wiring electrodes 4 which are pulled out from display electrodes 3 for the purpose of driving display electrodes 3, cell terminal electrodes 5 which give external currents to wiring electrodes 4, first common electrodes connected to cell terminal electrodes 5 in common on the inside of outer edges of cells along these outer edges, and a second common electrode 7 which surrounds the first common electrode 6s of cells and is conductively connected to them and is connected to first common electrodes 6 in common are provided on a glass substrate 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an electrode substrate of a simple matrix liquid crystal display.

[0002]

2. Description of the Related Art A conventional simple matrix liquid crystal display has a structure in which a liquid crystal is sandwiched between two glass substrates having transparent display electrodes formed in strips on the surface thereof.

An electrode substrate used in such a simple matrix liquid crystal display is manufactured by cutting a plurality of cells having an electrode pattern made of, for example, indium oxide on a glass substrate 1 as shown in FIG. To be done.

In FIG. 3, as an electrode pattern, a plurality of display electrodes 3 are arranged in parallel inside each cell outer edge 2.
And a wiring electrode 4 drawn out from the display electrode 3 for driving the display electrode 3 and a cell terminal electrode 5 for applying a current from the outside to the wiring electrode 4 are integrally arranged.
Further, a common electrode 6 commonly connected to the terminal electrode 5 is formed along the cell outer edge 2 just inside the cell outer edge 2.

The common electrode 6 is provided in order to prevent electrostatic breakdown that occurs during the entire cell manufacturing process. Therefore, the common electrode 6 is connected to the cell terminal electrode 5 within each cell.
Is connected to be short-circuited.

The common electrode 6 is scanned and irradiated with laser light at a high speed before the cell inspection, which is the final step in the cell manufacturing process, and is separated. That is, each cell is cut to the product size at the outer edge 2 of the cell, a liquid crystal material is sealed in the cut cell, and a polarizing plate is attached, and then the common electrode 6
Is separated from the cell terminal electrode 5 by laser light.

[0007]

However, when the common electrode 6 is formed in this way, the cell terminal electrode 5 is also cut when the common electrode 6 is cut by the laser beam, and as a result, the TAB is cut off. There is a risk that the reliability of the connection with the 5 may be impaired. Therefore, the width of the conventional common electrode 6 is relatively narrow, around 100 μm.

If the width of the common electrode 6 is narrowed in this way, the resistance value of the common electrode 6 itself becomes high, so that the electrostatic breakdown preventing effect becomes insufficient and the electrostatic breakdown is prevented. Even if the common electrode 6 is formed, there is a possibility that the display failure may occur due to the breakdown of the electrode due to static electricity or the discharge phenomenon.

Therefore, an object of the present invention is to provide a method for manufacturing an electrode substrate capable of preventing electrostatic breakdown in the cell manufacturing process.

[0010]

An electrode substrate of a liquid crystal display according to the present invention is provided on a glass substrate for driving a plurality of display electrodes arranged in parallel inside the outer edge of each cell and driving the display electrodes. A wiring electrode drawn from the display electrode, a cell terminal electrode for applying an external current to the wiring electrode, and a first common electrode commonly connected to the cell terminal electrode inside the cell outer edge along the cell outer edge. , A second common electrode surrounding the first common electrode of each cell and conductively connected to each other and commonly connected to the first common electrode.

In the electrode substrate of the liquid crystal display of the present invention, the second common electrode surrounds the first common electrodes of the two cells and is conductively connected to each other, and is commonly connected to the first common electrode. It is characterized by being a thing.

By thus forming the second common electrode, it is possible to reduce the resistance value of the entire common electrode, and it is possible to prevent display failure due to electrode breakdown due to static electricity or a discharge phenomenon.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an electrode substrate of a liquid crystal display according to the present invention will be described with reference to the plan view of FIG.

In FIG. 1, as in the prior art, as the electrode pattern on the glass substrate 1, the display electrodes 3 arranged in parallel inside the outer edges 2 of the cells and the display electrodes 3 for driving the display electrodes 3 are driven. The wiring electrode 4 drawn from the display electrode 3 to the
And a cell terminal electrode 5 for applying a current from the outside to the wiring electrode 4 are integrally formed. Further, immediately inside the cell outer edge 2, a cell terminal electrode 5 connected to the terminal electrode 5 along the cell outer edge 2 is formed. One common electrode 6 is formed. In the present embodiment, in addition to these, the second common electrode 7 having a wide width, for example, a width of 200 μm is formed around the first common electrode 6,
The second common electrode 7 is short-circuited with each of the first common electrodes 6.

As described above, since the second common electrode 7 is formed to have a wide width, it is possible to reduce the resistance value of the entire common electrode, and it is possible to prevent display failure due to electrode breakdown due to static electricity or a discharge phenomenon. It can be prevented. Further, as will be described later, when the cell is cut from the glass substrate 2 to the product size, the second common electrode 7 is separated from the cell,
The second common electrode 7 is not irradiated with laser light and does not affect the cell terminal electrode.

The second common electrode 7 is separated from the cells when each cell is cut to the product size by the cell outer edge 2 (see the plan view of FIG. 2). Therefore, the second common electrode 7 acts to prevent electrostatic breakdown from immediately after the alignment film application work, which is the first step of the cell manufacturing process, is cut to the product size at the cell outer edge 2. , Up to the sealing step. In the liquid crystal injecting step, the sealing step, and the polarizing plate attaching step, which are the steps after being cut to the product size at the cell outer edge 2, electrostatic breakdown is prevented by the first common electrode 6 as in the conventional case.

Although two cells are manufactured from one glass substrate in this specification, it goes without saying that the present invention can be applied to a case where more cells are manufactured from one glass substrate. is there.

[0018]

According to the present invention, it is possible to provide an electrode substrate of a liquid crystal display capable of preventing electrostatic breakdown in the cell manufacturing process.

[Brief description of the drawings]

FIG. 1 is a plan view for explaining an embodiment of an electrode substrate of a liquid crystal display according to the present invention.

FIG. 2 is a plan view after cutting the electrode substrate of the liquid crystal display of the present invention.

FIG. 3 is a plan view illustrating an electrode substrate of a conventional liquid crystal display.

[Explanation of symbols]

 1 Glass Substrate 2 Cell Outer Edge 3 Display Electrode 4 Wiring Electrode 5 Cell Terminal Electrode 6 First Common Electrode 7 Second Common Electrode

Claims (2)

[Claims] 1. On a glass substrate, a plurality of display electrodes arranged in parallel inside the outer edge of each cell, a wiring electrode drawn from the display electrode for driving the display electrode, and the wiring electrode. A cell terminal electrode that applies a current from the outside, a first common electrode that is commonly connected to the cell terminal electrode along the cell outer edge inside the cell outer edge, surrounds the first common electrode of each cell, and conducts each other. An electrode substrate of a liquid crystal display having a second common electrode which is connected and is commonly connected to the first common electrode. 2. The second common electrode is the first of two cells.
2. The electrode substrate for a liquid crystal display according to claim 1, wherein said common electrode surrounds said common electrode and is electrically connected to each other and is commonly connected to said first common electrode.