JPH09258232A - Production of liquid crystal display device and apparatus for production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the destruction of a liquid crystal display device and to produce the liquid crystal display device having good display quality at a good yield by discharging the charge on a substrate after spraying of gap materials during the transportation of this substrate. SOLUTION: The substrate 1 which has a transparent electrode and oriented film and is subjected to an orientation treatment, such as rubbing, is installed on a stage 4 having electrical conductivity. The gap materials 6 which are weighted to a specified weight by a gap material supplying device 5 are sprayed past a transporting pipe 7 onto the substrate 1 from an electrostatic gun or a nozzle 8. A pin 9 which is housed thus far on the lateral lower side of the stage 4 so as not to affect the spraying of the gap materials and has the electrical conductivity moves in such a manner that its front end comes into contact with the transparent electrode surface of the substrate 1. Destaticization is thus started. In such a case, just about one second is necessitated before the pin 9 moves to come into contact with the transparent electrode surface of the substrate 1 from the lateral lower side of the stage 4 and, therefore, tact time is not affected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a liquid crystal display device. More specifically, the present invention relates to a method for manufacturing a liquid crystal display device for preventing the liquid crystal display device from being damaged by static electricity in the gap agent spraying process.
The present invention also relates to an apparatus for manufacturing a liquid crystal display device that carries out the manufacturing method.

[0002]

2. Description of the Related Art In a manufacturing process of a liquid crystal display device, a spherical gap agent made of resin or silica is sprinkled on the substrates in order to keep a constant gap between two substrates of the liquid crystal display device.

Gap agent spraying methods are generally called wet type, dry type and semi-dry type.
There are two methods, but in recent years, the proportion of dry spraying methods has been gradually increasing from the viewpoints of environmental impact and gap agent spraying efficiency.

Further, in the dry spraying method, a method in which an electrostatic gun is used to forcibly charge the gap agent for spraying,
There is a method of spraying by utilizing triboelectric charging generated between the gap agent and the carrier tube in the carrier tube through which the gap agent passes. In any of the methods, the charged gap agent is dispersed on the substrate, so that the substrate itself is also significantly charged after being dispersed.

Now, the dry spraying method will be described.

A substrate having a transparent electrode and an alignment film, which has been subjected to an alignment treatment such as rubbing, is carried into a gap agent dispersion box by roller transfer or the like, and placed on a conductive stage. After that, a certain amount of the gap agent, which is weighed out by the gap agent supply device, is sprayed onto the substrate from the electrostatic gun or nozzle through the transfer tube.

After that, the substrate is carried out of the box again by roller conveyance or the like, and flowed to the next step.

[0008]

However, when trying to move the substrate immediately after spraying, the substrate itself is in a significantly charged state, so that the charges charged on the substrate are directed toward the conductive substance in the vicinity. However, there is a problem that the transparent electrode, the alignment film, etc. are destroyed by the electric discharge, and the yield is remarkably reduced. Further, in order to avoid the above problems, a method of waiting for the charge on the substrate to be discharged into the air by corona discharge and a decrease in the charge amount, or a method of peeling the substrate from the stage while inclining it obliquely and slowly carrying it However, there is a problem in that it takes time to transfer the substrate, which affects the tact time.

The present invention has been made in view of the above problems, and an object thereof is to solve the above problems by an easy method,
Without affecting the takt time, the liquid crystal display device is prevented from being destroyed by the discharge of the charges charged on the substrate after the gap agent is sprayed during the transfer of the substrate, and the liquid crystal display device with good display quality is produced at a high yield. It is to manufacture well.

[0010]

In a method of manufacturing a liquid crystal display device according to a first aspect of the present invention, a gap agent is sprayed on a substrate surface of a first liquid crystal panel substrate having an electrode portion by a dry spraying method. A gap agent spraying step, a bonding step of bonding the first liquid crystal panel substrate and the second liquid crystal panel substrate at a predetermined gap with a gap agent interposed, and a liquid crystal filling the gap with liquid crystal. In a method of manufacturing a liquid crystal display device, which comprises a filling step, a charge charged on the surface of the first liquid crystal panel substrate is removed in the gap agent spraying step between the gap agent spraying step and the liquid crystal filling step. It is characterized by having a process for

With this configuration, the first invention is
It is possible to prevent the liquid crystal display device from being destroyed by discharging the electric charge charged on the surface of the first liquid crystal panel substrate during the substrate transportation in the gap agent spraying step, and to obtain a liquid crystal display device with good display quality. It can be manufactured well.

A method of manufacturing a liquid crystal display device according to a second aspect of the present invention is the same as the method of manufacturing a liquid crystal display device according to the first aspect, wherein a conductive pin is brought into contact with the electrode portion to cause the electric charge to increase. It is characterized in that a removing step is performed.

With this structure, it is possible to surely remove the electric charge charged on the surface of the first liquid crystal panel substrate in the gap agent spraying step, and the electric charge is discharged during the transportation of the substrate. It is possible to prevent the display device from being broken and to manufacture a liquid crystal display device with good display quality at a high yield.

A method for manufacturing a liquid crystal display device according to a third aspect of the present invention is the method for manufacturing a liquid crystal display device according to the first aspect or the second aspect, wherein the gap agent spraying step and the charge removing step are performed. Is continuously performed in the same device.

With this structure, the tact time means that the liquid crystal display device is destroyed by the discharge of the electric charge charged on the surface of the first liquid crystal panel substrate in the gap agent spraying step during the transportation of the substrate. Therefore, a liquid crystal display device with good display quality can be manufactured with high yield.

An apparatus for manufacturing a liquid crystal display device according to a fourth invention of the present invention is characterized by carrying out any one of the methods for manufacturing a liquid crystal display device according to the first invention to the third invention.

With this structure, it is possible to remove the charges charged on the surface of the first liquid crystal panel substrate in the gap agent spraying step without affecting the tact time, and the charges are transferred during the substrate transfer. It is possible to prevent the liquid crystal display device from being broken by the discharge, and to manufacture a liquid crystal display device with good display quality at a high yield.

An apparatus for manufacturing a liquid crystal display device according to a fifth aspect of the present invention is a manufacturing apparatus for a liquid crystal display device for carrying out the method for producing a liquid crystal display device according to the third invention, wherein the electrode section And a conductive pin for performing the charge removing step by contacting with.

With this structure, the electric charges charged on the surface of the first liquid crystal panel substrate in the gap agent spraying step can be reliably removed without affecting the tact time, and during the substrate transfer. It is possible to prevent the liquid crystal display device from being destroyed due to the discharge of the electric charges, and to manufacture a liquid crystal display device with good display quality at a high yield.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Will be explained.

A substrate 1 having a transparent electrode and an alignment film and subjected to an alignment treatment such as rubbing is carried into a gap agent spraying box 3 by a roller transfer 2 or the like and stopped on a stage 4 and thereafter. As the stage 4 moves up, the substrate 1 is placed on the conductive stage 4. After that, a certain amount of the gap agent 6 weighed by the gap agent supply device 5 is sprayed onto the substrate 1 from the electrostatic gun or nozzle 8 through the transfer tube 7. After the spraying, as shown in FIG. 2, the conductive pin 9, which was previously stored on the lateral lower side of the stage 4 so as not to affect the spraying of the gap agent, has the tip as shown in FIG. It moves so as to come into contact with the transparent electrode surface of and the static elimination is started. Since it takes only about 1 second until the pin 9 moves from the lateral lower side of the stage 4 so as to come into contact with the transparent electrode surface of the substrate 1, it does not affect the tact time. Further, no deviation of the gap agent due to the contact of the pin with the substrate is observed. After that, the stage 4 descends while the contact state is maintained, and the substrate 1 is transferred to the roller transport 2 again. The pin 9 receives the substrate 1 on the roller transport 2, releases the contact with the substrate 1 immediately before starting the movement, and is housed again on the lateral lower side of the stage 4. Here, the pin 9 is grounded and is set so that it can move in synchronization with the vertical movement of the stage 4.
It should be noted that if the pin 9 is only brought into contact with the transparent electrode surface of the substrate 1 for a moment, the charge removal is insufficient and discharge occurs during transportation, which destroys the liquid crystal display device. Therefore, the substrate 1 is the roller transport 2
It is important to keep the pin 9 in contact with the transparent electrode surface of the substrate 1 until just before it is transferred to the substrate and starts moving.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention.

FIG. 2 is a schematic view showing a state where a charge removal pin is stored.

FIG. 3 is a schematic view showing a state during charge removal.

[Explanation of symbols]

 1. Substrate for liquid crystal panel having electrode portion 6. Gap agent 9. Conductive pin

Claims (5)

[Claims] 1. A gap agent spraying step of spraying a gap agent on a substrate surface of a first liquid crystal panel substrate having an electrode portion by a dry spraying method, the first liquid crystal panel substrate and the second liquid crystal panel substrate. A method of manufacturing a liquid crystal display device, comprising: a bonding step of bonding a substrate with a gap agent at a predetermined gap, and a liquid crystal filling step of filling the gap with liquid crystal, wherein the gap agent spraying step and the Between the liquid crystal filling process,
A method of manufacturing a liquid crystal display device, comprising: a step of removing charges charged on the surface of the first liquid crystal panel substrate in the gap agent spraying step. 2. The method of manufacturing a liquid crystal display device according to claim 1, wherein the charge removing step is performed by bringing a conductive pin into contact with the electrode portion. 3. The liquid crystal display device manufacturing method according to claim 1, wherein the gap agent spraying step and the charge removing step are continuously performed in the same device. Manufacturing method of display device. 4. An apparatus for manufacturing a liquid crystal display device for carrying out the method for manufacturing a liquid crystal display device according to claim 1. 5. A liquid crystal display device manufacturing apparatus for carrying out the method for manufacturing a liquid crystal display device according to claim 3.
An apparatus for manufacturing a liquid crystal display device, comprising a conductive pin for performing the charge removing step by contacting with the electrode portion.