JPH08278516A - Liquid crystal display device - Google Patents

Abstract

PURPOSE: To provide a liquid crystal display device decreased in line defects caused by the occurrence of static electricity. CONSTITUTION: This liquid crystal display device is constituted by forming X-Y signal line groups which are formed in an X-Y matrix form and thin-film transistor groups which are electrically connected to these signal groups and consist of metals, semiconductors and insulating films on one main surface of a first substrate, dividedly connecting these X-Y signal groups to driving IC packaging terminals by having prescribed spacings 10 in the plural groups at every driving IC unit at the ends of the first substrate and holding a liquid crystal layer in the opposite spacing part between a second substrate formed with counter electrodes and the first substrate. Spare electrodes 1-5 are arranged in the prescribed spacing 10 of the liquid crystal display device described above. These spare electrodes 1-5 are in an electrically conducting state with the counter electrodes. An effect of shielding static electricity acts sufficiently with the relatively simple constitution and, therefore, there is no more outflow of electric charges by the rapid change in the potential occurring in peeling electrification, working error, etc., in the subsequent production stages and the generate rate of the static electricity is drastically lowered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention is a thin film transistor (hereinafter TFT: T hin F that ilm T ransistor) operates the liquid crystal as a driving element, a manufacturing apparatus for a liquid crystal display device.

[0002]

2. Description of the Related Art A liquid crystal display device using a TFT is required to have high quality in addition to high precision and reliability. Therefore, in recent years, various manufacturing methods have been developed to improve the display quality, but there are various defects. Among them, line defects are one of the serious quality defects in process defects and market defects. This line defect occurs as a linear pixel unit defect in the X direction or the Y direction that does not depend on the display screen state.

As a cause mechanism of occurrence of line defects, X
I for controlling the signal lines in the Y direction or Y direction
A film forming process in which the defect of C is caused, the signal line group in the X or Y direction and the counter electrode are short-circuited due to a foreign substance or the like, and the counter short circuit is caused, and the X and Y direction signal line groups are short-circuited or disconnected. Caused by patterning failure of the signal line group at the time of production, and by static electricity caused by peeling, frictional charging, and contact potential difference caused when the LCD panel is removed from the jig in the manufacturing process or due to incomplete standby / storage conditions. .

When a line defect occurs due to the former three reasons, defective ICs are replaced, and the opposing short-circuited portion and the defective patterning portion are irradiated with a laser beam or the like to be processed.
Repair of line defects is almost completely possible. However, when a line defect occurs due to static electricity flowing in one direction of the signal line terminal portion in the X-direction or Y-direction signal line, the target panel is left unattended and the charge accumulated in the corresponding line is There is a method to wait until it relaxes or to keep the target panel at a high temperature of several tens to several hundreds of degrees Celsius so that the pre-tilt angle of the alignment film on the relevant line returns to the normal state, but the repair success rate is extremely unstable. In addition, there is a possibility that the number of target panels handled increases with an increase in process tact, which adversely affects the number of panels. Further, when a transient charge amount change (potential change) occurs, the TFT portion or the crossing portion of the X-direction and Y-direction signal lines via the insulating film is short-circuited by electrostatic breakdown, so that repair cannot be performed.

[0005]

Therefore, at present, a method of completely repairing line defects caused by static electricity has not been established, and there is a problem in terms of quality and productivity.

In view of the problems of the conventional liquid crystal display device, an object of the present invention is to provide a liquid crystal display device which eliminates line defects caused by static electricity.

[0007]

The present invention is intended to reduce the occurrence of line defects due to static electricity in a liquid crystal display device. Among the electrode groups arranged near the input terminal portion of the XY signal line group, the XY direction signal is used. The unstable electrode group, which is not electrically connected to the potential and the counter potential, is fixed to a large capacity constant potential.
As a result, an electrostatic shielding effect appears in the vicinity of the terminal portion, and a transient voltage change is reduced, so that it is possible to prevent occurrence of line defects themselves due to static electricity.

That is, according to the present invention, an XY signal line group formed in an XY matrix and a thin film transistor group electrically connected to the signal line group are formed on one main surface of the first substrate. The XY signal line group is divided at the end of the first substrate into a plurality of groups for each driving IC unit with a predetermined gap, and is connected to a driving IC mounting terminal and a counter electrode is formed. In a liquid crystal display device in which a liquid crystal layer is sandwiched in a facing gap between a second substrate and the first substrate, a metal electrode is arranged in the predetermined gap, and the metal electrode is electrically connected to the counter electrode. In this state, the electrode group having an unstable potential existing near the input terminal portion is fixed to a constant potential to improve quality and productivity.

Further, the preliminary electrodes arranged in a predetermined gap are electrically insulated from the XY signal line group.

Further, the preliminary electrodes arranged in the predetermined gaps are electrically connected to each other.

[0011]

According to the present invention, the non-fixed voltage potential electrode near the signal line input terminal portion in the liquid crystal display device is fixed to the same potential as the counter voltage potential to reduce the potential change with respect to the signal line potential, thereby charging up. It is possible to stop the outflow of the charges that have been made. As a result, it is possible to prevent a line defect caused by static electricity, which is caused by the charge charged up through the unstable potential electrode flowing to the signal line.

As a result, it is possible to reduce the occurrence rate of line defects due to static electricity in the liquid crystal display device and improve the quality and productivity.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows an XY input terminal electrode group 2-1, 2-2, a counter voltage extracting electrode section 2-3, an XY signal line group 2-4, 2-5, a TFT group 2-6 and an XY input terminal section. The schematic whole view of the board | substrate in which the short line 2-7 which shorts 2-1 and 2-2 was formed is shown. The XY signal line groups 2-4 and 2-5 are arranged in a matrix and divided into a plurality of groups at each end of the substrate for each driving IC unit. XY
At each intersection of the signal lines 2-4 and 2-5, the TFT 2-6 including the pixel electrode portion is formed to be a unit cell, and the unit cell is arranged at the intersection of the XY signal line groups 2-4 and 2-5. They are arranged in a matrix.

The liquid crystal layer is sandwiched between the substrate of FIG. 2 and the substrate on which the counter electrode is formed to form a liquid crystal display device, and a manufacturing process diagram at this time is shown in FIG. That is, an alignment film is printed on the first substrate, rubbed, then seal printed, and a conductive paste is applied. On the other hand, after printing the alignment film on the second substrate, rubbing is performed and seal printing is performed. The first substrate and the second substrate thus obtained are bonded to each other with a predetermined gap, after which the panel is cut and then liquid crystal is injected. Since the voltage of the counter electrode is supplied from a part of the input terminal electrode groups 2-1 and 2-2 on the substrate of FIG.
A paste-like conductive substance is applied to the counter voltage extracting electrode portions 2-3 arranged near the input terminal portion, and the conductive substance is adhered to the counter electrode side by alignment, so that the counter electrode voltage can be supplied. Also, XY input terminal block short line 2
-7 is provided to prevent and relieve the charge that has been charged up from flowing from one input terminal portion to one signal line due to a transient voltage change that occurs during the manufacturing process. However, in the cleaving / chamfering process, the short line 2-7 is removed, and the input terminal portions 2-1 and 2-2 become independent electrode portions.

As shown in the substrate of FIG. 1, the counter voltage extraction electrode portions for supplying a voltage from the input terminals are 1-1, 1-2,
Although only 1-3 and 1-4, a spare electrode unit 1-5 is provided between the blocks of the XY input terminal electrode group for adjusting the gap to the counter electrode substrate and for spareing the counter voltage extracting electrode unit. is there. However, conventionally, this spare electrode section 1-5
Is always in an unstable state because it exists in a state where it is not connected to the input terminal portion, and the charge that has been charged up from the preliminary electrode portion 1-5 to the adjacent XY signal line in the manufacturing process flows out due to discharge, which causes static electricity failure. The incidence was high.

Therefore, in this embodiment, a paste-like conductive substance is applied to the preliminary electrode portions 1-5 before the alignment and fixed to the potential of the counter electrode to keep a constant voltage. As a result, the electrode portion having an unstable potential existing near the input terminal portion is eliminated, and it is possible to prevent the occurrence of line defects due to static electricity in the manufacturing process.

In the pre-cutting / chamfering step, the short-circuit line causes a constant voltage to be applied to the electrodes, signal lines, and counter electrodes near the input terminals. It is possible to significantly reduce the occurrence rate of static electricity failure due to changes in peeling electrification voltage and the like.

Further, by connecting the independent electrode section and the counter electrode, the counter electrode capacity increases, and there is a concern that the image quality may deteriorate due to the change in the counter potential. However, the capacity of the independent electrode section is smaller than the counter electrode capacity. It is an additional capacity that can be ignored, and there is no problem in terms of quality and reliability.

Further, the preliminary electrodes arranged in a predetermined gap are
It does not matter that they are electrically connected to each other.

[0021]

As is apparent from the above description,
According to the present invention, an XY signal line group formed in an XY matrix and a thin film transistor group electrically connected to the signal line group are formed on one main surface of the first substrate.
The signal line group is divided into a plurality of groups for each driving IC unit at the end of the first substrate with a predetermined gap, and the driving I
In a liquid crystal display device in which a liquid crystal layer is sandwiched between a first substrate and a second substrate on which a counter electrode is formed and which is connected to a C mounting terminal, a preliminary electrode is provided in the predetermined gap. The auxiliary electrode is a liquid crystal display device that is arranged and is in electrical conduction with the counter electrode.

According to the present invention, the static electricity shielding effect is sufficiently exerted with a relatively simple structure, so that even in the subsequent manufacturing process, the outflow of electric charges due to abrupt potential change caused by peeling electrification or work error is eliminated.

As a result, the rate of static electricity generation in the liquid crystal display device is significantly reduced, and the quality and productivity can be improved, which is extremely useful in practice.

[Brief description of drawings]

FIG. 1 shows a liquid crystal display device according to an embodiment of the present invention, in which a paste-like conductive material is applied to a preliminary electrode portion existing near an input terminal portion, and an independent electrode potential is fixed to an opposing voltage potential by an alignment process. The top view which shows a case.

FIG. 2 is a plan view showing a substrate on which an XY input terminal electrode group, a counter voltage extraction electrode section, an XY signal line group, a TFT group, and an XY input terminal section short line are formed.

FIG. 3 is a general assembly process diagram of a liquid crystal display device.

[Explanation of symbols]

 1-1 to 1-4, 2-3 counter electrode extraction electrode section 2-1 to 2-2 XY input terminal electrode group 1-5 preliminary electrode section 2-4, 2-5 XY signal line group 2-6 TFT group 2-7 short line

Claims (3)

[Claims] 1. An XY signal line group formed in an XY matrix and a thin film transistor group electrically connected to the signal line group are formed on one main surface of a first substrate,
The Y signal line group is divided into a plurality of groups for each driving IC unit at the end of the first substrate with a predetermined gap, and is connected to a driving IC mounting terminal and a counter electrode is formed. In a liquid crystal display device in which a liquid crystal layer is sandwiched in a gap between a second substrate and the first substrate, a preliminary electrode is arranged in the predetermined gap, and the preliminary electrode is electrically connected to the counter electrode. A liquid crystal display device characterized in that 2. The preliminary electrode arranged in a predetermined gap,
The liquid crystal display device according to claim 1, wherein the liquid crystal display device is electrically insulated from the XY signal line group. 3. The preliminary electrode arranged in a predetermined gap,
The liquid crystal display device according to claim 1, wherein each of the liquid crystal display devices is in an electrically conductive state.