JPH05127177A - Sealing structure for liquid crystal display element - Google Patents

Abstract

(57) [Abstract] [Purpose] A liquid crystal display device has a seal that seals the peripheral portions of two glass substrates that are opposed to each other with a predetermined gap, and injects liquid crystal in a short time without damaging an alignment film. The purpose is to provide a seal structure that can be used. An outer seal 6 having at least one opening 61 formed along the outer periphery of the glass substrate 1, and an inner seal having a plurality of openings 71 formed inside the outer seal 6. 7, a liquid crystal flow channel 8 is formed between the liquid crystal flow channel 8 and the liquid crystal flow channel 8 and the inner seal 7
The liquid crystal 4 is injected into the inner seal 7 via 71.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal for sealing the peripheral portions of two glass substrates opposed to each other in a liquid crystal display device with a predetermined gap.

[0002] In recent years, with the remarkable spread of the liquid crystal display device, the cost reduction of the liquid crystal display device is required, and it is desired to improve the yield and shorten the manufacturing time. However, if the flow rate of the liquid crystal is increased and the injection time is shortened in the liquid crystal injection process, the alignment film may be damaged. Therefore, it is desired to develop a seal structure that can inject liquid crystal in a short time without damaging the alignment film.

[0003]

2. Description of the Related Art FIG. 3 is a perspective view showing an example of a conventional seal structure, and FIG. 4 is a side sectional view showing an example of a liquid crystal injection method.

In FIG. 3, a twist nematic type liquid crystal display device usually has two glass substrates 1 opposed to each other with a predetermined gap, and each glass substrate 1 has a plurality of transparent electrodes 11 and transparent electrodes inside. An alignment film 12 formed so as to cover 11 is provided.

In a conventional liquid crystal display device, as a means for facing two glass substrates 1 at a predetermined interval and sealing the peripheral edge, a resin mixed with a spacer material such as glass fiber is printed to form a glass substrate. A seal 2 is formed on the outer periphery of 1.

The alignment film 12 made of polyimide resin or the like and provided with the alignment property by rubbing in one direction enhances the adhesion between the glass substrate 1 and the seal 2 and improves the distance between the glass substrates 1 with high precision. Therefore, it is formed in a region surrounded by the seal 2.

The seal 2 has one or two openings 21. After the two glass substrates 1 are bonded to each other through the seal 2 to form a cell, a space surrounded by the glass substrate 1 and the seal 2 is formed. Liquid crystal is injected through the opening 21 as shown by an arrow to seal the opening 21.

Two glass substrates 1 through the seal 2
As shown in FIG. 4 (a), the device for injecting the liquid crystal 4 into the cell 3 in which the two are bonded has an opening 21 in the inner space surrounded by the partition wall 51.
It is equipped with an injection jig 52 and a jig support frame 53 for mounting the cell 3 with the cell bottom facing down, and a table 55 which is arranged below the injection jig 52 and which vertically moves a liquid crystal dish 54 in which the liquid crystal 4 is stored.

When the liquid crystal is injected into the cell 3, FIG.
While the liquid crystal dish 54 is lowered as shown in (a), the injection jig 52 to which the cell 3 is attached is placed at a predetermined position of the jig support frame 53, and a vacuum pump (not shown) is operated. The inside of the partition wall 51 is evacuated. By making the inside of the partition wall 51 in a vacuum state, the inside of the cell 3 is naturally in a vacuum state.

Next, as shown in FIG. 4 (b), the liquid crystal dish 54 is raised to immerse the opening 21 of the cell 3 in the liquid crystal 4, and gas is fed into the partition wall 51 to bring the pressure in the internal space to a predetermined level. To raise. By increasing the pressure in the partition wall 51, the liquid crystal 4 is pressurized and injected into the cell 3 through the opening 21.

[0011]

However, in the conventional seal structure, when the liquid crystal is injected, the flow velocity of the liquid crystal is high in the vicinity of the opening and becomes slower as the distance from the opening increases. As a result, if the pressure in the partition wall is increased and the flow velocity of the liquid crystal is further increased in order to shorten the injection time of the liquid crystal, there is a problem that the friction between the liquid crystal and the alignment film near the opening increases and the alignment film is damaged. It was

An object of the present invention is to provide a seal structure capable of injecting liquid crystal in a short time without damaging the alignment film.

[0013]

FIG. 1 is a perspective view showing a seal structure according to the present invention. Note that the same object is denoted by the same symbol throughout the drawings.

The above problem is a seal for sealing the peripheral portions of two glass substrates facing each other with a predetermined gap in a liquid crystal display element, and having at least one opening portion 61 of the glass substrate 1. A liquid crystal flow channel 8 is formed between the outer seal 6 formed along the outer periphery and the inner seal 7 formed inside the outer seal 6 having a plurality of openings 71. This is achieved by the sealing structure of the liquid crystal display element of the present invention configured to inject the liquid crystal 4 into the inner seal 7 through the opening 61, the liquid crystal flow path 8 and the opening 71 of the inner seal 7.

[0015]

In FIG. 1, an external seal having at least one opening and formed along the outer periphery of the glass substrate,
A liquid crystal flow path is formed between the internal seal having a plurality of openings and formed inside the external seal, and the internal seal is formed through the external seal opening and the liquid crystal flow path and the internal seal opening. By injecting the liquid crystal into the inner seal, for example, even if the flow rate of the liquid crystal injected through the opening of the outer seal is further increased in order to shorten the injection time, a plurality of inner seals provided inside the inner seal are provided. The flow velocity of the liquid crystal injected through the opening is significantly reduced. That is, it is possible to realize a seal structure capable of injecting liquid crystal in a short time without damaging the alignment film.

[0016]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. 2 is a perspective view showing another embodiment of the seal structure according to the present invention.

In FIG. 1, in the liquid crystal display device according to the present invention, two glass substrates 1 are made to face each other at a predetermined interval and a peripheral portion is sealed. Therefore, for example, a resin mixed with a spacer material such as glass fiber is used. The outer seal 6 and the inner seal 7 are formed by printing.

The external seal 6 having one or two openings 61 along one side of the glass substrate 1 is formed along the outer periphery of the glass substrate 1 and has a plurality of openings 71. A liquid crystal channel 8 is formed between the inner seal 7 and the inner seal 7.

The alignment film 12 provided with orientation by rubbing in one direction makes the gap between the glass substrates 1 highly accurate and enhances the adhesion between the glass substrate 1 and the outer seal 6 and the inner seal 7 inside. It is formed in the area surrounded by the seal 7.

After the two glass substrates 1 are bonded to each other through the outer seal 6 and the inner seal 7 to form a cell, the opening 61 of the outer seal 6, the liquid crystal flow path 8 and the inner seal 7 are opened as indicated by an arrow. The liquid crystal 4 is injected into the inner seal 7 through the portion 71.

The width of the opening 71 provided in the inner seal 7 is not uniform and is narrower as it is closer to the opening 61 and wider as it is farther from the opening 61. That is, the closer to the opening 61, the greater the flow path resistance in the opening 71 becomes, and the liquid crystal 4 flowing into the inner seal 7 flows.
The flow velocity of is almost uniform.

Another embodiment of the seal structure according to the present invention is an internal seal 9 instead of the internal seal 7 as shown in FIG.
The liquid crystal channel 8 is formed between the outer seal 6 and the inner seal 9 provided inside the outer seal 6 so as to close the opening 61.

After the two glass substrates 1 are bonded to each other through the outer seal 6 and the inner seal 9 to form a cell, the inner seal 9 is inserted through the opening 61 and the liquid crystal channel 8 as shown by an arrow.
Liquid crystal 4 is injected into the inside of. The liquid crystal 4 flowing in from the opening 61 is divided by the inner seal 9 and the flow velocity when flowing into the inner seal 9 is reduced.

The liquidity of the liquid crystal 4 flowing between the glass substrates 1 is better when the liquid crystal 4 is present than when the alignment film 12 is not provided. Therefore, in the embodiment of the present invention, in addition to the inside of the inner seal, the alignment film 12 is applied not only to the region constituting the liquid crystal flow path 8 of the glass substrate 1.

In the embodiment of the present invention, the inner seals 7 and 9 are formed directly on the glass substrate 1, but an alignment film 12 may be interposed therebetween. However, in that case, it is necessary to change the size of the spacer material mixed in the resin for forming the outer seal and for forming the inner seal.

As described above, the outer seal having at least one opening formed along the outer periphery of the glass substrate and the inner seal provided inside the outer seal so as to divide the liquid crystal flowing from the opening. By forming a liquid crystal flow path between the liquid crystal and the inner seal through at least the outer seal opening and the liquid crystal flow path, for example, through the outer seal opening to shorten the injection time. Even if the flow rate of the injected liquid crystal is further increased, the flow rate of the injected liquid crystal is significantly reduced inside the inner seal through a plurality of openings provided in the inner seal. That is, it is possible to realize a seal structure capable of injecting liquid crystal in a short time without damaging the alignment film.

[0027]

As described above, according to the present invention, it is possible to provide a seal structure capable of injecting liquid crystal in a short time without damaging the alignment film.

[Brief description of drawings]

FIG. 1 is a perspective view showing a seal structure according to the present invention.

FIG. 2 is a perspective view showing another embodiment of the seal structure according to the present invention.

FIG. 3 is a perspective view showing an example of a conventional seal structure.

FIG. 4 is a side sectional view showing an example of a liquid crystal injection method.

[Explanation of symbols]

 1 Glass Substrate 4 Liquid Crystal 6 External Seal 7 Internal Seal 8 Liquid Crystal Flow Path 9 Internal Seal 12 Alignment Film 61 Opening 71 Opening

Claims (4)

[Claims] 1. A seal for sealing a peripheral portion of two glass substrates facing each other with a predetermined gap in a liquid crystal display element, the glass substrate having at least one opening (61). Between the outer seal (6) formed along the outer periphery of (1) and the inner seal (7) having a plurality of openings (71) formed inside the outer seal (6). A liquid crystal flow channel (8) is formed, and the internal seal is provided through the opening (61) of the external seal (6) and the opening (71) of the liquid crystal flow channel (8) and the internal seal (7).
A seal structure for a liquid crystal display device, characterized in that the liquid crystal (4) is injected inside the (7). 2. A seal for sealing the peripheral portions of two glass substrates opposed to each other with a predetermined gap in a liquid crystal display element, the seal having at least one opening (61). The outer seal (6) formed along the outer periphery of 1) and the opening
A liquid crystal channel (8) is formed between the outer seal (6) and an inner seal (9) formed inside the outer seal (6) to close the opening (61) of the outer seal (6). And a liquid crystal flow channel (8) inside the inner seal (9) to inject the liquid crystal (4). 3. The opening of the outer seal (6) is narrower as the opening (71) of the inner seal (7) according to claim 1 is closer to the opening (61) of the outer seal (6). A seal structure for a liquid crystal display element, which is wider as it is farther from (61). 4. An alignment film (1) is provided on a wall surface of the glass substrate (1) according to claim 1 or 2 which is in contact with at least a liquid crystal (4).
A seal structure for a liquid crystal display device, characterized in that the above 2) is adhered.