JPH0634981A - Production and apparatus for production of liquid crystal display device - Google Patents

Abstract

PURPOSE:To enable a sealing material to be applied 7 in a short time on the orientation surface of a substrate without damaging the orientation surface. CONSTITUTION:The sealing material 7 is discharged from pattern parts 25 on the peripheral surface of a roller 22 at the time of applying the sealing material. The opposite spacing between the peripheral surface of the roller 22 and the inside wall surface 1a of the substrate 1 is maintained constant. The rotating peripheral surface of the roller 22 and the opposite inside wall surface of the substrate 1 are relatively moved by rotating the roller 22 to apply the sealing material 7 to the inside wall surface 1a of the substrate 1. Then, the contact of the roller 22 with the substrate 1 is averted and the damaging of the orientation surface of the substrate 1 is prevented. The sealing material 7 is applied to the prescribed patterns 25 by the required rotation of the roller 22, by which the sealing material 7 is applied in a short time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to sealing between two substrates having transparent electrodes formed on the inner wall surfaces facing each other.
The present invention relates to a method and an apparatus for manufacturing a liquid crystal display, which applies a sealant to the inner wall surface of a substrate.

[0002]

2. Description of the Related Art Generally, there are many types of liquid crystal displays, such as TN type, DS type, GH type, SBE type and thermal writing type, depending on the operation mode. , Field effect type TN type or SBE
The mold is used.

As an example of a liquid crystal display using such an operation mode, there is a liquid crystal display described in, for example, JP-A-60-107020.

In this liquid crystal display device, two glass substrates having transparent electrodes formed on the inner wall surface are made to face each other in parallel via a spacer, and a peripheral portion between the glass substrates is sealed with a sealant to form a cell. And is formed by injecting liquid crystal into the cell.

In the case of the TN type, the distance between the glass substrates is about 4 to 7 μm. As the nematic liquid crystal to be injected, cyclohexane-based, ester-based, biphenyl-based, pimidine-based liquid crystal, etc. are usually used.

Conventionally, a printing method and a dispenser method have been generally used as a method for applying a sealing agent for sealing the two glass substrates.

In the printing method, a sealing agent is uniformly applied onto a printing plate having a seal pattern formed thereon, the printing plate is pressed against a glass substrate, and the sealing agent is applied to the printing plate from above by using a ski bar. This is a method in which a sealing agent is printed on the glass substrate by extruding in a pattern on the lower side.

In the dispenser method, a glass substrate is placed below a nozzle filled with a sealant, and the sealant is discharged while moving the nozzle or the glass substrate in the XY directions to apply in a predetermined pattern. Is the way.

[0009]

As described above, there are a printing method and a dispenser method as a sealing agent application method for sealing two glass substrates, and in each case, there is a peculiarity to each method. There is a problem.

That is, in the printing method, the sealant can be applied in a short time, but since the printing plate comes into contact with the alignment film on the glass substrate, the alignment film is easily soiled or scratched, and the yield is reduced.

Further, in the dispenser method, since the printing plate or the like does not contact the surface of the alignment film on the glass substrate, the surface of the alignment film is not soiled or damaged, but it takes a long time to apply the sealant.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method and an apparatus for manufacturing a liquid crystal display, which can apply a sealant in a short time without damaging the alignment surface of a substrate. Has an aim.

[0013]

According to a first aspect of the present invention, a sealant is applied to the inner wall surface of a substrate when sealing between two substrates having transparent electrodes formed on the inner wall surfaces facing each other. In the method for manufacturing a liquid crystal display according to the above, a pattern portion is provided on the peripheral surface of the roller so that the sealing material can be discharged corresponding to the application pattern of the sealing material on the substrate, and the pattern on the peripheral surface of the roller when the sealing material is applied. The sealing agent is discharged from the portion to keep the facing distance between the peripheral surface of the roller and the inner wall surface of the substrate constant, rotate the roller, and relatively move the rotating peripheral surface of the roller and the inner wall surface facing the substrate. , Apply a sealant to the inner wall surface of the substrate.

According to the second aspect of the present invention, when sealing between two substrates having transparent electrodes formed on the inner wall surfaces facing each other, a liquid crystal display is manufactured by applying a sealant to the inner wall surfaces of the substrates. In the device, a hollow roller provided with a pattern portion on the peripheral surface that allows the sealing agent to be discharged corresponding to the coating pattern of the sealing agent on the substrate, and a peripheral surface of the roller that is inserted inside the roller Maintaining a constant facing distance to the inner wall surface of the substrate, supporting the roller so as to rotate integrally, and
And a shaft member for supplying a sealant from the inside of the roller to the pattern portion.

[0015]

According to the present invention, the sealant is discharged from the pattern portion of the roller, the roller is rotated without contacting the substrate with the roller, and the rotating peripheral surface of the roller and the inner wall surface facing the substrate are relatively moved. The sealant is applied onto the substrate by moving the sealant to the substrate. The sealant is applied in a predetermined pattern by the required rotation of the roller, and the application time of the sealant is determined by the rotation speed of the roller.

According to the second aspect of the present invention, the sealant is supplied to the pattern portion from the inside of the roller, the sealant is discharged from the pattern portion on the peripheral surface of the roller, and the roller is rotated without contacting the roller with the substrate. At the same time, the sealant is applied on the substrate by relatively moving the rotation peripheral surface of the roller and the inner wall surface of the substrate facing each other. The sealant is applied in a predetermined pattern by the required rotation of the roller, and the application time of the sealant is determined by the rotation speed of the roller.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a liquid crystal display, and the structure of the liquid crystal display will be described in the order of manufacturing steps.

First, the transparent electrodes 3 and 4 and the transparent electrodes 3 and 4 are formed on the inner wall surfaces 1a and 2a of the two glass substrates 1 and 2.
Alignment films 5 and 6 are formed so as to cover the film.

Next, the inner wall surfaces 1a and 2a of the two substrates 1 and 2 are opposed to each other in parallel, and the peripheral portions are sealed with a sealant 7 at a predetermined interval. This sealing step is performed in the order of a sealant applying step, a sealant defoaming step, a spacer arranging step, an assembling step, and a sealant curing step.

The sealing agent applying step is a step which is a feature of the present invention and will be described in detail later. A sealant 7 containing a high-precision glass spacer (not shown) is applied and formed in a pattern.

In the sealing agent defoaming step, the patterned sealing agent 7 is degassed by heating at about 90 ° C. for about 1 hour.

In the spacer arranging step, the spacers 8 are uniformly arranged between the inner wall surfaces 1a and 2a of the substrates 1 and 2 by a wet spraying method or a dry spraying method.

The assembling process is performed on the inner wall surface 1 of the two substrates 1 and 2.
Stack so that a and 2a face each other.

In the sealing agent curing step, the two substrates 1 and 2 that have been stacked are heated and cured while being pressed with a force of, for example, 300 g / cm ² .

Next, after the liquid crystal 9 is injected from the liquid crystal injection port into the gap surrounded by the sealant 7 between the two glass substrates 1 and 2, the liquid crystal injection port is sealed with, for example, an ultraviolet curing adhesive. To do.

Next, the polarizing plate 10 is attached to the outer wall surface 1b of the substrate 1, and the polarizing plate 11 and the reflecting plate 12 are attached to the outer wall surface 2b of the substrate 2. In this way, the desired liquid crystal display is obtained.

1 to 3 show a roller body 21 of a coating device for coating the sealing agent 7 in the sealing agent coating step.
Indicates. This roller body 21 includes a roller 22 and this roller.
A shaft member 23 is inserted through the central portion of 22.

The roller 22 is formed in a cylindrical shape having an insertion portion 24 for inserting the shaft member 23 in the center, and a pattern portion 25 is formed on the peripheral surface corresponding to the application pattern of the sealant 7 on the substrate 1. There is. The pattern portion 25 is composed of a groove which is continuously opened on the outer peripheral surface side of the cylinder except the liquid crystal injection port portion,
The groove is opened to communicate with the inner peripheral surface of the roller 22.

The shaft member 23 has large diameter portions 27 provided at both ends of a hollow shaft portion 26, and the sealing agent 7 is applied to a step portion between the inner end surface of the both large diameter portions 27 and the peripheral surface of the shaft portion 26. A filling portion 28 for filling is formed. A pipe portion 29, which communicates with the inner space of the shaft portion 26 from the end surface of one of the large diameter portions, is projected, and air is supplied to the pipe portion 29 from an air supply means (not shown). The shaft portion 26 is provided with a vent hole (not shown) through which the air supplied therein flows out to the filling portion 28.

The roller body 21 is the insertion portion of the roller 22.
The shaft member 23 is inserted into the shaft 24, and the filling portion 28 is airtightly fitted inside the roller 22. It is rotatably supported via a shaft member 23, and is rotationally driven by a driving means (not shown).

Further, the coating device is composed of the roller 22 of the roller body 21.
And the inner wall surface 1a of the substrate 1 to be set on the coating table (not shown) are kept facing each other at a constant interval.
By moving one or both of 21 and the coating table, the rotating peripheral surface of the roller 22 and the facing inner wall surface 1a of the substrate 1 are relatively moved.

Then, in the sealing agent applying step,
From the air supply means through the inner space of the shaft member 23, the filling portion 28
Apply a predetermined air pressure to the pattern part 25 on the peripheral surface of the roller 22.
A predetermined amount of the sealing agent 7 is discharged from.

While rotating the roller body 21, one or both of the roller body 21 and the coating table are moved to relatively move the rotating peripheral surface of the roller 22 and the facing inner wall surface 1a of the substrate 1. As a result, the sealing agent 7 discharged from the peripheral surface of the roller 22 is applied to the inner wall surface 1a of the substrate 1. The sealant 7 is applied in a predetermined pattern by the required rotation of the roller 22, and the application time of the sealant 7 is determined by the rotation speed of the roller 22.

Therefore, since the peripheral surface of the roller 22 does not come into contact with the orientation surface of the substrate 1, the substrate 1 does not have the conventional printing method.
It is possible to prevent scratches on the orientation surface of. Moreover, since the sealant 7 is applied by the rotation of the roller 22, the sealant can be applied in a shorter time than the conventional dispenser method.

[0036]

According to the first aspect of the invention, the sealant is discharged from the pattern portion of the roller, the roller is rotated without contacting the substrate with the roller, and the inner peripheral wall surface of the rotating peripheral surface of the roller and the substrate is opposed. By moving and relative to each other, the sealant can be applied on the substrate, and the alignment surface of the substrate can be prevented from being scratched. Moreover, the sealant can be applied in a predetermined pattern by the required rotation of the roller,
The sealant can be applied in a short time.

According to the second aspect of the present invention, the pattern portion is provided on the peripheral surface of the roller, and the sealant is supplied from the inside of the roller to discharge from the pattern portion. The roller is rotated without contacting the substrate with the substrate. By causing the rotation peripheral surface of the roller and the inner wall surface of the substrate facing each other to move relative to each other, the sealant can be applied on the substrate and scratches on the oriented surface of the substrate can be prevented. Moreover, the sealant can be applied in a predetermined pattern by the required rotation of the roller, and the sealant can be applied in a short time.

[Brief description of drawings]

FIG. 1 is a perspective view of a coating apparatus showing an embodiment of the present invention.

FIG. 2 is a perspective view of a roller of the above embodiment.

FIG. 3 is a perspective view in which a part of the shaft member of the above embodiment is cut away.

FIG. 4 is a cross-sectional view of a liquid crystal display device to be manufactured by the present invention.

[Explanation of symbols]

 1, 2 substrate 1a, 2a inner wall surface 3,4 transparent electrode 7 sealant 22 roller 23 shaft member 25 pattern part

Claims (2)

[Claims] 1. A method for manufacturing a liquid crystal display, wherein a sealing agent is applied to an inner wall surface of a substrate for sealing between two substrates having transparent electrodes formed on opposite inner wall surfaces thereof. A pattern part that allows the sealant to be discharged corresponding to the coating pattern of the sealant on the substrate is provided. When the sealant is applied, the sealant is discharged from the pattern part on the peripheral surface of the roller, It is possible to apply a sealant to the inner wall surface of the substrate while keeping the distance between the inner wall surface of the substrate and the roller constant and rotating the roller and moving the rotating peripheral surface of the roller and the inner wall surface of the substrate relative to each other. A method for manufacturing a characteristic liquid crystal display. 2. A liquid crystal display manufacturing apparatus for applying a sealant to the inner wall surface of a substrate for sealing between two substrates having transparent electrodes formed on the inner wall surfaces facing each other. A hollow roller provided with a pattern portion that allows the sealing agent to be discharged according to the coating pattern of the sealing agent on the substrate, and the inner surface of the roller, which is inserted inside the roller and faces the inner surface of the substrate. An apparatus for manufacturing a liquid crystal display, comprising: a shaft member that keeps a constant interval, supports a roller so as to be integrally rotatable, and supplies a sealant from the inside of the roller to a pattern portion.