JP2775087B2 - Liquid crystal injection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for injecting liquid crystal into a liquid crystal cell.

[0002]

2. Description of the Related Art In a liquid crystal panel, generally, two transparent substrates each having a transparent electrode formed on opposing surfaces are bonded together via a sealing material, and liquid crystal is sealed between the two transparent substrates inside the sealing material. It has a structure.

By the way, in the case of injecting a liquid crystal in manufacturing such a liquid crystal panel, FIG.
As shown in (1), first, a liquid crystal cell 4 in which liquid crystal is not sealed is prepared by laminating two transparent substrates 1 and 2 with a sealing material 3 interposed therebetween. In this case, a liquid crystal injection port 5 is formed at the center of the sealing material 3 at the lower end of the liquid crystal cell 4. Then, the liquid crystal cell 4 is disposed above the liquid crystal container 7 disposed in the vacuum chamber 6, and then a vacuum pump (not shown) connected to the other end of the pipe 8 having one end connected to the vacuum chamber 6 is driven. The inside of the liquid crystal cell 4 is evacuated through the liquid crystal injection port 5 by making the inside of the vacuum chamber 6 vacuum. Next, as shown in FIG.
Is immersed in the liquid crystal 9 in the liquid crystal container 7, and then the inside of the vacuum chamber 6 is set to the atmospheric pressure through the pipe 8, so that the liquid crystal 9 in the liquid crystal container 7 is Inject into 4. Next, the liquid crystal cell 4 is taken out of the vacuum chamber 6, and then the liquid crystal injection port 5 is sealed with a sealing material (not shown).

[0004]

However, in such a conventional liquid crystal injection method, the entire lower end of the liquid crystal cell 4 where the liquid crystal injection port 5 is formed is immersed in the liquid crystal 9 in the liquid crystal container 7. Therefore, the portion of the liquid crystal cell 4 that is immersed in the liquid crystal 9 in the liquid crystal container 7 becomes considerably larger than the size of the liquid crystal injection port 5. As a result, for example, as compared with the case where only the liquid crystal injection port 5 is immersed, the liquid crystal cell 4
When the transparent substrates 1 and 2 are glass substrates, the amount of impurities such as alkali components in the glass penetrating into the liquid crystal 9 in the liquid crystal container 7 is considerably increased. The liquid crystal 9 in the liquid crystal container 7 is easily contaminated,
When the contaminated liquid crystal 9 is injected into the liquid crystal cell 4,
There is a problem that display quality is deteriorated. In addition, the liquid crystal 9 unnecessarily adheres to the entire outer surface of the lower end of the liquid crystal cell 4. However, since this is cleaned with a solvent in a later process, expensive liquid crystal is considerably wasted. However, there was a problem that the cost was high. An object of the present invention is to provide a liquid crystal injection method capable of minimizing a portion of a liquid crystal cell immersed in liquid crystal in a liquid crystal container as much as possible.

[0005]

According to the present invention, a part of the liquid surface of the liquid crystal in the liquid crystal container is raised by surface tension by an upper end portion of a coil spring provided upright in the liquid crystal container. The liquid crystal injection port of the liquid crystal cell is immersed in the raised portion of the liquid crystal, and in this state, the liquid crystal in the liquid crystal container is injected into the liquid crystal cell through the liquid crystal injection port.

[0006]

According to the present invention, a part of the liquid surface of the liquid crystal in the liquid crystal container is raised by surface tension by the upper end portion of the coil spring provided upright in the liquid crystal container. The liquid crystal in the liquid crystal container is immersed in this state, and the liquid crystal in the liquid crystal container is injected into the liquid crystal cell through the liquid crystal injection port in this state. can do.

[0007]

FIG. 1A shows a schematic configuration of a liquid crystal injection device according to an embodiment of the present invention. In this figure, the same reference numerals are given to the same parts as in FIG. 3A, and the description thereof will be omitted as appropriate. In this liquid crystal injection device,
A coil spring 10 is provided upright at a predetermined location in the liquid crystal container 7. When a predetermined amount of the liquid crystal 9 is stored in the liquid crystal container 7, the raised portion 9 of the liquid crystal 9 is placed on the upper end of the coil spring 10 by surface tension.
a is formed, whereby a part of the liquid surface of the liquid crystal 9 in the liquid crystal container 7 is raised. In this case, since the diameter of the coil spring 10 is larger than the width of the liquid crystal injection port 5, the diameter of the raised portion 9a of the liquid crystal 9 formed at the upper end of the coil spring 10 is larger than the width of the liquid crystal injection port 5. Has also become larger.

[0008] One end of a liquid crystal supply pipe 11 is disposed above the liquid crystal container 7. The other end of the liquid crystal supply pipe 11 projects outside the vacuum chamber 6 and is connected to an external liquid crystal container 13 via a solenoid valve 12. Further, a liquid level detection sensor 14 is arranged above the liquid crystal container 7. The liquid level detection sensor 14 emits the laser light 14a downward and detects the laser light 14a reflected on the liquid surface of the liquid crystal 9 in the liquid crystal container 7, thereby detecting the liquid light of the liquid crystal 9 in the liquid crystal container 7. The height of the surface is detected. The detection signal of the liquid level detection sensor 14 is supplied to the control circuit 15 and the control circuit 1
Reference numeral 5 controls opening and closing of the solenoid valve 12 based on the detection signal. Although not shown, a vertical moving means such as a motor for holding and vertically moving the liquid crystal cell 4 is provided at a predetermined position in the vacuum chamber 6 above the coil spring 10.

When the liquid crystal 9 is injected into the liquid crystal cell 4 by the liquid crystal injection device, first, the liquid crystal cell 4 is arranged at a predetermined upper limit position in the vacuum chamber 6, and then the vacuum chamber 6
The inside is sealed. Next, the inside of the vacuum chamber 6 is evacuated by driving a vacuum pump connected to the pipe 8,
The inside of the liquid crystal cell 4 is evacuated through the liquid crystal injection port 5. Next, the liquid crystal cell 4 is lowered by driving up and down moving means such as a motor to be positioned at the lower limit position. In this state, the coil spring 10 is slightly compressed by the lower end surface of the liquid crystal cell 4, and as shown in FIG.
Is pressed against the upper end of the liquid crystal cell 4 with a certain pressure, so that the liquid crystal injection port 5 of the liquid crystal cell 4 is raised at the raised portion 9a of the liquid crystal 9 formed at the upper end of the coil spring 10.
Will be immersed in. Then, when the inside of the vacuum chamber 6 is set to the atmospheric pressure via the pipe 8, the liquid crystal 9 in the raised portion 9 a is injected into the liquid crystal cell 4 through the liquid crystal injection port 5.

When the liquid level of the liquid crystal 9 in the liquid crystal container 7 falls with the injection of the liquid crystal 8 into the liquid crystal cell 4, the liquid level detecting sensor 14 detects this and the detection signal is sent to the control circuit 15
To supply. Then, the control circuit 15 opens the solenoid valve 12 based on this detection signal, and thereby the external liquid crystal container 1 is opened.
The liquid crystal 9 in 3 is supplied into the liquid crystal container 7 through the liquid crystal supply pipe 11. When the liquid level of the liquid crystal 9 in the liquid crystal container 7 rises and reaches a predetermined height, the liquid level is detected by a liquid level detection sensor 14.
And supplies a detection signal to the control circuit 15. Then, the control circuit 15 controls the solenoid valve 12 based on the detection signal.
Is closed, whereby the supply of the liquid crystal 9 from the external liquid crystal container 13 into the liquid crystal container 7 via the liquid crystal supply pipe 11 is stopped. By repeating such a thing, the liquid crystal container 7
The liquid level of the liquid crystal 9 is controlled so as to always be a predetermined height. When the injection of the liquid crystal 9 into the liquid crystal cell 4 is completed, the liquid crystal cell 4 is taken out of the vacuum chamber 6, and then the liquid crystal injection port 5 is sealed with a sealing material (not shown). Is completed.

[0011] Thus, in this liquid crystal injection device, display the part of the liquid surface of the liquid crystal 9 in the liquid crystal container 7 by the upper end portion of the coil spring 10 provided upright in the liquid crystal container 7
The raised portion 9a of the liquid crystal 9 is raised by the surface tension.
The liquid crystal 9 in the liquid crystal container 7 is injected into the liquid crystal cell 4 through the liquid crystal injection port 5 in this state. The part immersed in the liquid crystal 9 can be made as small as possible. As a result, the amount of impurities such as dust adhering to the outer surface of the liquid crystal cell 4 penetrating into the liquid crystal 9 in the liquid crystal container 7 can be considerably reduced, so that the liquid crystal 9 in the liquid crystal container 7 is contaminated. Therefore, it is possible to prevent the deterioration of the display quality due to the contamination of the liquid crystal 9 as much as possible. In addition, since the liquid crystal 9 is unnecessarily attached only to the outer surface of the liquid crystal injection port 5 of the liquid crystal cell 4, even if this is washed with a solvent in a later process, expensive liquid crystal can be considerably saved. Therefore, the cost can be reduced accordingly. Further, when a plurality of coil springs 10 are arranged at equal intervals in the liquid crystal container 7, the liquid crystal 9 can be injected into the plurality of liquid crystal cells 4 at one time.

In the above embodiment, the diameter of the coil spring 10 is made larger than the width of the liquid crystal injection port 5, and the diameter of the raised portion 9a of the liquid crystal 9 formed at the upper end of the coil spring 10 is adjusted to the diameter of the liquid crystal injection port. Although the width is set to be larger than the width of 5, the present invention is not limited to this. For example, as shown in FIG.
May be smaller than the width of the liquid crystal injection port 5 so that the diameter of the raised portion 9a of the liquid crystal 9 formed at the upper end of the coil spring 10 is smaller than the width of the liquid crystal injection port 5. However, in this case, the width of the liquid crystal container 7 is set to be slightly larger than the width of the liquid crystal injection port 5, and the height of the liquid surface in a state where the liquid crystal 9 is fully filled in the liquid crystal container 7 becomes a predetermined height. To In this case, if the length of the liquid crystal container 7 is increased to some extent, for example, as shown in FIG.
As shown in FIG. 2A, not only can the liquid level of the liquid crystal 9 be detected by the liquid level detection sensor 14 and the liquid crystal 9 can be supplied by the liquid crystal supply tube 11, but also the liquid crystal can be supplied to a plurality of liquid crystal cells 4 at one time. 9 injections can also be performed.

As shown in FIG. 2B, when the liquid crystal injection port 5 of the liquid crystal cell 4 is pressed against the upper end of the coil spring 10 with a certain pressure, the coil spring 10 contracts. The gap between the lower end surface of the liquid crystal cell 4 and the upper end surface of the side wall of the liquid crystal container 7 is reduced. As a result, the liquid crystal 9 in the liquid crystal container 7 near the liquid crystal inlet 5 is reduced.
Rises to some extent due to the surface tension, and the width of the raised portion 9 a becomes larger than the width of the liquid crystal injection port 5. Therefore, even if the diameter of the coil spring 10 is smaller than the width of the liquid crystal inlet 5, the width of the liquid crystal container 7 is made slightly larger than the width of the liquid crystal inlet 5, so that the liquid crystal 9 can be formed.
The width of the raised portion 9a is larger than the width of the liquid crystal injection port 5, so that the liquid crystal 9 in the liquid crystal container 7 can be satisfactorily injected into the liquid crystal cell 4 through the liquid crystal injection port 5.

[0014]

As described above, according to the present invention, a part of the liquid surface of the liquid crystal in the liquid crystal container is surfaced by the upper end of the coil spring provided upright in the liquid crystal container.
The liquid crystal filling port of the liquid crystal cell is immersed in the raised portion of the liquid crystal by the tension , and the liquid crystal in the liquid crystal container is injected into the liquid crystal cell through the liquid crystal filling port in this state. The part immersed in the liquid crystal can be made as small as possible, and as a result, the deterioration of the display quality due to the contamination of the liquid crystal can be prevented as much as possible.
In addition, expensive liquid crystals can be saved considerably, and costs can be reduced accordingly.

[Brief description of the drawings]

FIG. 1A is a schematic configuration diagram of a liquid crystal injection device according to an embodiment of the present invention, and FIG. 1B is a diagram illustrating a state when the liquid crystal is injected.

FIG. 2A is a schematic configuration diagram of a liquid crystal injection device according to another embodiment of the present invention, and FIG. 2B is a diagram illustrating a state when the liquid crystal is injected.

FIG. 3A is a schematic configuration diagram of a conventional liquid crystal injection device,
(B) is a diagram showing a state when the liquid crystal is injected.

[Explanation of symbols]

 Reference Signs List 4 liquid crystal cell 5 liquid crystal injection port 6 vacuum tank 7 liquid crystal container 9 liquid crystal 9a raised portion 10 coil spring 11 liquid crystal supply pipe 12 solenoid valve 14 liquid level detection sensor 15 control circuit

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G02F 1/1341 G02F 1/13 101

Claims (1)

(57) [Claims] A part of a liquid surface of a liquid crystal in the liquid crystal container is raised by a surface tension by an upper end portion of a coil spring provided upright in the liquid crystal container. A liquid crystal injection method characterized by immersing an inlet, and in this state, injecting liquid crystal in the liquid crystal container into the liquid crystal cell through the liquid crystal injection port.