JPH11174473A - Manufacture of liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce quantity of liquid crystal(LC) to be used and to reduce generation of LC injection misses by pressing the LC injection ports of plural set LC cells to a coil spring and simultaneously injecting LC by a partial dipping method. SOLUTION: A coil spring 7a is arranged in an LC container 4 so that the height direction of the spring 7a is aligned to the array direction of plural LC cells 1. The LC injection ports 3 of plural set LC cells 1 are pressed to the spring 7a and LC 5 is simultaneously injected into the ports 3 by a partial dipping method. Thereby the liquid surface of the LC 5 is swelled in a state uniformly infiltrated into the spring 7a by the surface tension of the LC 5, the quantity of LC 5 to be used is reduced only by the volume of the spring 7a and spill of LC 5 from the container 4 can be prevented. Even when parallelism on the liquid surface of LC 5 in the height direction of injection ports 3 of plural LC cells 1 is not uniform, ununiformity is eased by the elastic power of the spring 7a by depressing the cells 1 to the spring 7a and LC 5 can be stably injected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a liquid crystal display device in which a liquid crystal injection port of a plurality of set liquid crystal cells is brought into contact with liquid crystal of a liquid crystal container to perform liquid crystal injection.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show a liquid crystal injection method of a conventional liquid crystal display device. A liquid crystal display device is manufactured by bonding a pair of substrates with a sealing material to form a liquid crystal cell, and injecting liquid crystal into the liquid crystal cell. At this time, the sealing material is applied so that liquid crystal can be injected into the liquid crystal cell.
A liquid crystal injection port is formed at a position or more.

A method of injecting a liquid crystal into a liquid crystal cell includes a total immersion method in which a liquid crystal cell is immersed in a liquid crystal container and a liquid crystal is injected by immersing the entire side of the liquid crystal cell with a liquid crystal injection port. The method is divided into a partial immersion method in which liquid crystal is injected by immersing only a portion having an entrance.

However, in the full immersion method, impurities or the like adhering to the outer surface of the liquid crystal cell enter the inside of the liquid crystal cell to contaminate the liquid crystal, or unnecessary liquid crystal adheres to the outer surface of the liquid crystal cell to waste liquid crystal. Therefore, the partial immersion method can be preferably used.

As shown in FIG. 4, in the partial immersion method, a plurality of liquid crystal cells 1 are set inside a vacuum chamber 6, and a liquid crystal injection port 3 on which a sealing material 2 is not applied is provided at a lower portion.
A liquid crystal container 4 containing a liquid crystal 5 is arranged. The liquid crystal container 4 is an elongated container, and is filled with the liquid crystal 5 so that the surface of the liquid crystal 5 rises due to surface tension.

Then, the inside of the vacuum chamber 6 is once evacuated, the liquid crystal injection port 3 is brought into contact with the rising portion of the liquid crystal 5, and the inside of the vacuum chamber 6 is returned to the normal pressure again, so that the liquid crystal cell 1 is filled with the liquid crystal. Is injected.

[0007]

However, in such a configuration, although the amount of liquid crystal to be put into the liquid crystal container 4 is smaller than that in the full immersion method, it is necessary to use the elongated liquid crystal container 4 to raise the liquid level by surface tension. Therefore, when the liquid crystal injection port 3 is brought into contact with the raised portion of the liquid crystal 5, there is a problem that the liquid crystal 5 is easily spilled and the injection error rate is increased.

Japanese Patent Laid-Open Publication No. Hei 6-308447 discloses that a liquid crystal container 4 is provided with a plate spring as shown in FIG. A method of setting 9 has been proposed.

By setting the leaf spring 9 in the liquid crystal container 4 in this manner, the amount of the liquid crystal 5 used can be reduced by the volume of the leaf spring 9. In this method, FIG.
As shown in (b), the liquid crystal injection port 3 of the liquid crystal cell 1 is brought into contact with the liquid crystal 5 raised by the leaf spring 9 or a certain pressure is applied to the liquid crystal injection port 3 of the liquid crystal cell 1 above the leaf spring 9. To inject the liquid crystal 5
The liquid crystal 5 easily enters the inside of the liquid crystal cell 1, and the liquid crystal 5 can be made harder to spill than in the related art.

However, in the method of installing the leaf springs 9 in the liquid crystal container 4, when liquid crystals are simultaneously injected into a plurality of liquid crystal cells 1 set, the raised portions of the leaf springs 9 and the respective liquid crystal injection ports 3 are connected to each other. It is difficult to maintain a constant distance between them, and it is difficult to adjust the parallelism of the leaf spring 9 and the parallelism of the plurality of liquid crystal injection ports 3, so that there is a problem that injection errors are likely to occur.

Specifically, when the cassette in which the plurality of liquid crystal cells 1 are set is inclined, the liquid crystal cells 1 at both ends of the cassette are shifted in the distance between the liquid crystal injection port 3 and the raised portion of the leaf spring 9. Even when the liquid crystal injection port 3 of the liquid crystal cell 1 is pressed against the upper part of the leaf spring 9 with a certain pressure when the liquid crystal 5 is injected, the leaf spring 9 is generally rigid and has an elastic modulus of 0.2 to 0.1. Since the displacement is as small as about 5 mm / kg, the displacement cannot be buffered. In some cases, the cassette can be held by the leaf spring 9 so that the liquid crystal cell 1 on one side of the cassette can contact the liquid crystal 5 but the other side. Liquid crystal cell 1
Has a problem that the liquid crystal 5 cannot be injected because the liquid crystal 5 cannot be contacted.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a method of manufacturing a stable liquid crystal display device in which the amount of liquid crystal used is reduced as much as possible and the injection of liquid crystal is minimized.

[0013]

According to the present invention, a coil spring is provided in a liquid crystal container. According to the present invention, when injecting liquid crystal into a plurality of set liquid crystal panels at one time, even when the distance between the liquid crystal injection port of the liquid crystal panel and the leaf spring is different at both ends of the plurality of set liquid crystal panels, The coil spring buffers the difference in the distance between the liquid crystal injection port and the leaf spring, thereby providing a stable liquid crystal display manufacturing method with less liquid crystal injection errors.

[0014]

According to a first aspect of the present invention, there is provided a method of manufacturing a liquid crystal display device, wherein a liquid crystal injection port of a liquid crystal cell in which a plurality of liquid crystal cells are set is brought into contact with liquid crystal of a liquid crystal container to perform liquid crystal injection. Is characterized by disposing a coil spring corresponding to the liquid crystal injection port of each liquid crystal cell, simultaneously injecting liquid crystal by a partial immersion method by pressing the liquid crystal injection ports of the liquid crystal cells set in a plurality of sheets against the coil spring. I do.

According to this configuration, when injecting liquid crystal into a plurality of set liquid crystal cells, even if the distance between the liquid crystal injection ports of all the liquid crystal cells and the coil spring is not uniform, the error is caused by the elasticity of the coil spring. Since the buffer is buffered, the liquid crystal can be injected stably with few injection errors.Moreover, the liquid crystal surface rises while the liquid crystal is uniformly wrapped around the coil spring due to surface tension. Thus, the amount of liquid crystal used can be reduced by the volume of the coil spring, and the liquid crystal can be prevented from spilling out of the liquid crystal container by holding the injection port of the liquid crystal cell with the coil spring.

According to a second aspect of the present invention, there is provided a method of manufacturing a liquid crystal display device according to the first aspect, wherein the height direction of the coil spring is arranged along the arrangement direction of the plurality of liquid crystal cells, and the liquid crystal is simultaneously injected. Features.

According to this configuration, since a single coil spring can be used for a plurality of liquid crystal cells with respect to the liquid crystal injection port provided at the same position, the coil spring can be easily installed.

According to a third aspect of the present invention, in the method for manufacturing a liquid crystal display device according to the first aspect, the height direction of the coil spring is arranged in the depth direction of the liquid crystal, and the liquid crystal is simultaneously injected. According to this configuration, since the elastic force of the coil spring becomes larger, even when the inclination of the side provided with the liquid crystal injection port of the liquid crystal cell is large, the liquid crystal injection port of the liquid crystal cell has a certain pressure on the upper part of the coil spring. When pressed,
Since the elastic force of the spring buffers the inclination, the liquid crystal can be stably injected.

According to a fourth aspect of the present invention, in the method for manufacturing a liquid crystal display device according to the second aspect, the liquid crystal is simultaneously injected by inserting a core rod extending in the arrangement direction of the plurality of liquid crystal cells into the inner diameter of the coil spring. And

According to this configuration, even when the length of the coil spring is long, it is possible to prevent the coil spring from being bent due to the pressing of the liquid crystal cell, and it is possible to suppress waving of the liquid surface of the liquid crystal. Liquid crystal injection can be performed.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. Components similar to those shown in FIGS. 4 and 5 showing the conventional example are denoted by the same reference numerals.

(Embodiment 1) FIG. 1 shows (Embodiment 1) of the present invention. The configuration of the liquid crystal cell 1 is the same as that of the conventional example shown in FIGS. 4 and 5, but in this (Embodiment 1), as shown in FIGS. The coil springs 7a are arranged such that the height direction of the coil springs 7a is along the direction in which the plurality of liquid crystal cells 1 are arranged.

As shown in FIG. 1C, by providing the coil spring 7a in the liquid crystal container 4, the liquid level of the liquid crystal 5 can be raised in a state where the liquid crystal 5 is uniformly wrapped around the coil spring 7a by the surface tension of the liquid crystal 5. In addition, the amount of the liquid crystal 5 used can be reduced by the volume of the coil spring 7a. Furthermore, even if the coil spring 7a is pressed by the liquid crystal injection port 3 when the liquid crystal 5 is injected, the liquid crystal 5 can be prevented from spilling out of the liquid crystal container 4 by holding the liquid crystal injection port 3 by the coil spring 7a.

Further, when a plurality of liquid crystal cells 1 are arranged and immersed in the liquid surface of the liquid crystal 5 raised by the coil spring 7a, the parallelism in the height direction of the liquid crystal injection ports 3 of each liquid crystal cell 1 is not uniform. However, since the liquid crystal cell 1 is pressed against the coil spring 7a to be buffered by the elastic force of the coil spring 7a, more stable injection of the liquid crystal 5 with less injection errors can be performed.

The diameter of the coil spring 7a is 3 mm
From 5mm, elastic modulus of 1.0 to 3.0m
It has an elastic modulus of about m / kg, which is considerably larger than the elastic modulus of the leaf spring 9 described above.

(Embodiment 2) FIG. 2 shows (Embodiment 2) of the present invention. Although the configuration is almost the same as that of the above (Embodiment 1), in the (Embodiment 1), the coil spring 7a is arranged in the liquid crystal container 4 so that the height direction thereof is along the arrangement direction of the liquid crystal cells 1. However, this (Embodiment 2)
The difference is that the coil spring 7b is arranged in the liquid crystal container 4 with the height direction of the coil spring 7b being the depth direction of the liquid crystal.

As shown in FIGS. 2A and 2B, in the liquid crystal container 4, a coil spring 7b in which the height direction of the coil spring 7b is arranged in the depth direction of the liquid crystal 5 includes one liquid crystal injection member. One for each of the entrances 3 is provided.

With this configuration, substantially the same effects as those of the first embodiment can be obtained, but the coil spring 7b
By disposing the height direction of the liquid crystal 5 in the depth direction of the liquid crystal 5, the elasticity of the spring is further increased, and even when the liquid crystal cell 1 is inclined, the liquid crystal injection port 3 is placed with a certain pressure on the upper part of the coil spring 7b. By pressing, the inclination is buffered by the elastic force of the coil spring 7b, and the liquid crystal 5 can be more stably injected.

(Embodiment 3) FIG. 3 shows Embodiment 3 of the present invention. As shown in FIGS. 3A and 3B, the configuration is substantially the same as the above (Embodiment 1), but the inner diameter of the coil spring 7a set in the liquid crystal container 4 has a plurality of liquid crystal cells. The difference is that a core rod 8 extending in the arrangement direction is inserted.

With such a configuration, even if the length of the coil spring 7a becomes long, even if the liquid crystal cell 1 presses the coil spring 7a with a certain pressure when the liquid crystal 5 is injected, the coil spring 7a is bent. Disappears. As a result, the liquid surface of the liquid crystal 5 can be prevented from waving due to the bending of the coil spring 7a, and more stable injection can be performed.

Furthermore, the amount of liquid crystal used can be further reduced by the volume of the core rod 8.

[0032]

As described above, according to the method of manufacturing a liquid crystal display device of the present invention, when simultaneously injecting liquid crystal into a plurality of set liquid crystal cells, the liquid crystal is made to correspond to the liquid crystal injection port of each liquid crystal cell. By disposing the coil spring in the container,
Due to the buffering action of the spring, stable liquid crystal injection with few injection errors can be performed. In addition, the amount of liquid crystal used can be reduced by the volume of the coil spring, and injection errors due to spilling of liquid crystal from the liquid crystal container can be prevented.

[Brief description of the drawings]

FIG. 1 is a front view, a side view, and a partially enlarged view of a front view inside a vacuum chamber in (Embodiment 1);

FIGS. 2A and 2B are a front view and a side view inside a vacuum chamber in Embodiment 2; FIGS.

FIGS. 3A and 3B are a front view and a side view inside a vacuum chamber in Embodiment 3;

FIG. 4 is a front view of the inside of a vacuum chamber in a conventional partial immersion method.

FIG. 5 is a front view and a partially enlarged view inside a vacuum chamber in a conventional partial immersion method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal cell 2 Sealing material 3 Liquid crystal injection port 4 Liquid crystal container 5 Liquid crystal 6 Vacuum chamber 7a, 7b Coil spring 8 Core rod

Claims (4)

[Claims] When a liquid crystal injection is performed by bringing the liquid crystal injection ports of a plurality of liquid crystal cells into contact with the liquid crystal of the liquid crystal container, a coil spring is arranged in the liquid crystal container so as to correspond to the liquid crystal injection port of each liquid crystal cell. A method for manufacturing a liquid crystal display device, wherein liquid crystal injection ports of a plurality of set liquid crystal cells are pressed against the coil spring to simultaneously inject liquid crystal by a partial immersion method. 2. The method for manufacturing a liquid crystal display device according to claim 1, wherein the height direction of the coil spring is arranged along the direction in which the plurality of liquid crystal cells are arranged, and the liquid crystal is simultaneously injected. 3. The method for manufacturing a liquid crystal display device according to claim 1, wherein the height direction of the coil spring is arranged in the depth direction of the liquid crystal, and the liquid crystal is simultaneously injected. 4. A method for manufacturing a liquid crystal display device according to claim 2, wherein liquid crystals are simultaneously injected by inserting a core rod extending in an arrangement direction of a plurality of liquid crystal cells into an inner diameter portion of the coil spring.