JPH01296219A - Production of liquid crystal display element - Google Patents

Abstract

PURPOSE:To enable uniform pressurization of substrates without flawing the substrate surfaces by holding the peripheral parts of two sheets of the substrates which are superposed on each other via a seal by means of jigs, sucking the air between the two substrates and uniformly pressurizing the substrate surfaces by utilizing the atm. pressure. CONSTITUTION:Transparent electrodes for plural pieces of LCDs corresponding to the display patterns are patterned on the opposite surfaces of the glass substrates 1 and 2 and the substrates are superposed on each other via the sealing material 6 and spacer particles consisting of a UV curing resin. Two sets of such two sheets a set of the superposed substrates 3 are superposed on each other via frame-shaped spacers 7 and are mounted to the central part of the jigs 9, by which the peripheral parts are grasped. The air in the gap between the substrates 1 and 2 communicating with the hollow part A is sucked as well and the surfaces of the substrates 1, 2 is pressurized by the atm. pressure if the air in the hollow part A of the jigs 9 is sucked by a vacuum pump, etc., via a pressure control valve 8. The sealing material 6 is cured and the substrates 1, 2 are integrated when the substrates are irradiated with the U.V rays from both upper and lower directions while the pressurized state is maintained.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for manufacturing a liquid crystal display element (hereinafter referred to as LCD), and particularly relates to a method for manufacturing a liquid crystal display element (hereinafter referred to as LCD), and in particular, a method for manufacturing a liquid crystal display element (hereinafter referred to as LCD), and in particular, a method for manufacturing a liquid crystal display element (hereinafter referred to as LCD). Concerning methods for

[Conventional technology]

When manufacturing an LCD, usually the LCD 1 is placed on the opposing surface in advance.
Two glass substrates on which several transparent electrodes have been patterned are placed one on top of the other with spacer particles and a sealant sprinkled between these substrates interposed, and by curing this sealant, both glass substrates are bonded together. They are integrated while maintaining a cell gap of several to 10 μm. Then, after cutting a set of two integrated glass substrates to obtain a large number of empty cells, each empty cell is filled with liquid crystal to complete an LCD.

By the way, in the past, such integration of glass substrates was done in the third stage.
This was done in the manner shown in the figure. That is, a plurality of sets of two substrate polymers 3, each consisting of an upper glass substrate 1 and a lower glass substrate 2 stacked on top of each other, are sandwiched between pressure stages 5 with spacer plates 4 interposed therebetween. In the pressed state, each substrate polymer 3 is heated at 150 to 180° C. for about 1.5 hours. Here, the substrate polymer 3 is
A sealing material made of thermosetting resin is applied to one of the upper and lower glass substrates 1 and 2, and spacer particles are sprinkled on the other before they are stacked. The glass substrate 1.2 is integrated with a predetermined cell gap maintained.

[Problem to be solved by the invention]

However, in the conventional method described above, since the substrate polymer 3 is mechanically pressed using the pressure stage 5, it is extremely difficult to apply uniform pressure to the entire surface of the glass substrates 1 and 2. There was a problem in that it was not easy to set the size to a predetermined size. Furthermore, since the spacer plate 4 is in surface contact with the glass substrate 1.2, there is a risk that the surface of the glass substrate may be damaged during pressurization.

Furthermore, since thermosetting resins such as epoxy have been used as sealing materials, the pressure and heating process takes about 1□5
Although it takes time, if an ultraviolet curing resin is used as the sealing material, the working time can be significantly shortened. However, in the conventional method described above, since the glass substrate is held down by a surface, even if ultraviolet rays are irradiated, both glass substrates 1
．． As a result, the ultraviolet curing resin could not be used as a sealing material.

The present invention has been made in view of these circumstances,
The first objective is to provide a method for manufacturing an LCD that can uniformly apply pressure without damaging the surface of the glass substrate when integrating two stacked glass substrates.

Further, the second object of the present invention is to provide an L resin in which ultraviolet curing resin can be used as a sealing material interposed between two glass substrates.
An object of the present invention is to provide a method for manufacturing a CD.

[Means to solve the problem]

In order to achieve the above object, the present invention holds the peripheral edges of two glass substrates stacked one on top of the other through a sealing material, and suctions the air between the two glass substrates to clean the surface of the glass substrates. Pressure was applied at atmospheric pressure, and the sealing material was cured in this state.

[Effect]

According to the above means, as the air between the two stacked glass substrates is sucked, atmospheric pressure uniformly applies pressure to the entire surface of the glass substrate, and the peripheral edge of the glass substrate is held. Therefore, there is no risk of damaging the surface of the glass substrate in the effective area, and since the effective area can be directly irradiated with ultraviolet rays, it becomes possible to use an ultraviolet curing resin as a sealing material.

〔Example〕

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

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a schematic sectional view thereof, and parts corresponding to those in FIG. 3 are given the same reference numerals.

In Fig. 1.2, - on the opposing surfaces of the upper glass substrate l and the lower glass substrate 2, there are LCs corresponding to the display pattern.
Several transparent electrodes (not shown) D″fy are sealed 1: Both glass substrates 1 and 2 are overlapped with a sealing material 6 made of ultraviolet curing resin interposed therebetween, that is, one substrate is A sealing material 6 is applied to the other substrate, spacer particles are sprinkled on the other substrate, and the substrate polymers 3 are stacked on top of each other to form a substrate polymer 3. Then, two sets of such two substrate polymers 3 are combined with a frame-shaped spacer. After stacking them on top of each other via 7, they are mounted on the center of a jig 9 equipped with a pressure regulating valve 8, and the periphery of each substrate polymer 3 is held between the jig 9 and the jig 9.

This jig 9 is a combination of an upper half 9a and a lower half 9b made of a hard material such as metal.
The airtightness between the two halves 9a, 9b and the substrate polymer 3 is maintained by packings 10.11 made of silicone rubber or the like, and the airtightness between the two halves 9a, 9b and the substrate polymer 3 is maintained by packings 12.11 made of silicone rubber or the like.
It is maintained by 13.

Now, after the two sets of substrate polymers 3 are mounted on the jig 9 in this way, the pressure regulating valve 8 is connected to a vacuum pump or the like to suck the air in the hollow portion A of the jig 9. As a result, the hollow part A
Air in the gap between the upper and lower glass substrates 1.2 communicating with each other is also sucked in, and the surface of each glass substrate 1.2 is pressurized by atmospheric pressure. Therefore, by appropriately adjusting the pressure regulating valve 8, it is possible to pressurize the pair of glass substrates 1 and 2 in the proximal direction with a predetermined pressure using atmospheric pressure, and while maintaining this pressurized state, The effective area of each substrate polymer 3 exposed at the center of the jig 9 is irradiated with ultraviolet rays from both the upper and lower directions in FIG.

When irradiated with ultraviolet rays for one minute in this manner, the sealing material 6 made of ultraviolet curable resin is cured, and the upper and lower glass substrates 1.
2 are integrated.

In this way, in the above embodiment, the upper and lower stacked glass substrates 4N1.2 are pressurized using atmospheric pressure, so the entire surface of each glass substrate 1.2 can be uniformly pressurized. Therefore, there is an effect that the cell gap can be easily set to a predetermined dimension. In addition, the jig 9 is used to hold the substrate polymer 3.
Since the peripheral edges of the glass substrates 1 and 2 are held in place, there is no risk that the surface of each glass substrate 1. Since it is possible to reach between 2
Ultraviolet curing resin is used as the sealing material 6, so the curing time is reduced from the conventional one hour and 30 minutes.
It has been shortened to minutes. Furthermore, since the above embodiment only requires the preparation of the jig 9 and the ultraviolet irradiation furnace, the equipment is not large-scale compared to the conventional technology that requires a pressure stage and a heating furnace, and it has the additional effect that it is easier to set up a production line. There is.

In addition, although the above example illustrates the case where an ultraviolet curable resin is used as the sealing material, a normal thermosetting resin may be used instead of the ultraviolet curable resin, and in this case as well,
Since pressure is applied using atmospheric pressure, it is easy to create a cell gap, and there is no risk of damaging the surface of the glass substrate during pressurization, so workability and yield are improved compared to conventional techniques.

〔Effect of the invention〕

As explained above, according to the present invention, two superimposed
When integrating two glass substrates, atmospheric pressure can be used to uniformly apply pressure to the entire surface of the glass substrate, making it easier to create a cell gap and holding the periphery of the glass substrate. There is no risk of scratching the surface of the glass substrate in the effective area (at the same time, it is possible to use ultraviolet curable resin as a sealing material, which greatly shortens the curing time, etc., resulting in remarkable effects.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a schematic sectional view thereof, and FIG. 3 is an explanatory diagram showing a conventional technique. 1...Top glass substrate, 2...
...Lower glass substrate, 6... Sealing material, 7
・・・・・・・・・Frame spacer, 8・・・・・・・・・
・Pressure control valve, 9...Jig, 10. 1
1.12゜13...Patsukin. Figure 1 Figure 2 a

Claims (1)

[Claims] 1. After a set of two glass substrates on which transparent electrodes corresponding to a display pattern are formed are stacked with spacer particles and a sealant interposed between these glass substrates, ,
In a method of manufacturing a liquid crystal display element in which both glass substrates are integrated by curing the sealing material, the peripheral edges of the two glass substrates stacked on top of each other are held via the spacer particles and the sealing material, and A method for manufacturing a liquid crystal display element, characterized in that the surface of the glass substrate is pressurized at atmospheric pressure by suctioning air between both glass substrates, and the sealing material is cured in this state. 2. In the description of claim 1, an ultraviolet curing resin is used as a sealing material interposed between two glass substrates, and the glass substrate is irradiated with ultraviolet rays when curing this sealing material. A method for manufacturing a liquid crystal display element characterized by: