JPH08179334A - Production of liquid crystal display device - Google Patents

Abstract

PURPOSE: To reduce the contact area between a liquid crystal cell and liquid crystal in a liquid crystal container in the case of injecting the liquid crystal in the liquid crystal cell. CONSTITUTION: A liquid crystal cell forming body 21 for forming four liquid crystal cells is constituted by sticking two base plates 11 and 12 through a sealing material for a liquid crystal cell 15 having a liquid crystal injection port 16 and projecting both base plates 11 and 12 at a part corresponding to the injection port 16 so as to obtain a projected part 22. Then, in the case of injecting the liquid crystal, the projected part 22 of the forming body 21 is immersed in the liquid crystal 24 in the liquid crystal container 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a liquid crystal display device.

[0002]

2. Description of the Related Art In a liquid crystal display device, two transparent substrates each having transparent electrodes formed on opposite surfaces thereof are bonded to each other with a sealing material, and liquid crystal is sealed between the transparent substrates inside the sealing material. There is a structure.

By the way, in the case of injecting a liquid crystal in manufacturing such a liquid crystal display device, as shown in FIG. 7 as an example, first, two transparent substrates 1 and 2 are bonded together with a sealing material 3 interposed therebetween. That is, a liquid crystal cell 4 in which liquid crystal is not sealed is prepared. In this case, a liquid crystal injection port 5 is formed in the central portion of the sealing material 3 at the lower end of the liquid crystal cell 4. The liquid crystal cell 4 is placed in a vacuum chamber (not shown), and the inside of the liquid crystal cell 4, that is, the inside of the sealing material 3 is sealed through the liquid crystal injection port 5 by creating a vacuum in the vacuum chamber. After making a vacuum between the first and second portions, the lower end of the liquid crystal cell 4 is dipped in the liquid crystal 7 in the liquid crystal container 6 arranged in the vacuum chamber, and then the inside of the vacuum chamber is set to the atmospheric pressure. The liquid crystal 7 in the container 6 is injected into the liquid crystal cell 4 through the liquid crystal injection port 5, then the liquid crystal cell 4 is taken out from the vacuum chamber, and then the liquid crystal injection port 5 is sealed with a sealing material (not shown). .

[0004]

However, in the conventional method of manufacturing such a liquid crystal display device, the entire lower end portion of the liquid crystal cell 4 in which the liquid crystal injection port 5 is formed is dipped in the liquid crystal 7 in the liquid crystal container 6. Therefore, the contact area between the liquid crystal cell 4 and the liquid crystal 7 in the liquid crystal container 6 is large. Therefore, when the lower end portion of the liquid crystal cell 4 is dirty, the deterioration of the liquid crystal 7 in the liquid crystal container 6 is promoted. There was a problem. An object of the present invention is to provide a method for manufacturing a liquid crystal display device capable of reducing deterioration of liquid crystal in a liquid crystal container.

[0005]

According to the first aspect of the present invention,
Two transparent substrates are bonded together via a liquid crystal cell sealing material having a liquid crystal injection port, and the two transparent substrates in a portion corresponding to the liquid crystal injection port are projected, and the projecting portion is placed inside the liquid crystal container. By immersing the liquid crystal in the liquid crystal, the liquid crystal is injected into the liquid crystal cell sealing material through the liquid crystal injection port. According to a second aspect of the present invention, the two transparent substrates are bonded together through a plurality of liquid crystal cell sealing materials that have liquid crystal injection ports on the same side and are arranged to arrange liquid crystal cells. By projecting the two transparent substrates at portions corresponding to the plurality of liquid crystal inlets and immersing these protruding portions in the liquid crystal in the liquid crystal container, the plurality of liquid crystal cells are passed through the plurality of liquid crystal inlets. The liquid crystal is injected into the inside of the sealing material. According to a fourth aspect of the present invention, a plurality of liquid crystal cell sealing materials, each having a liquid crystal injection port on the same side and arranged to arrange liquid crystal cells, and liquid crystal injection ports of the liquid crystal cell sealing materials. The two transparent substrates are bonded to each other via a liquid crystal injection channel sealing material having one common liquid crystal injection port and corresponding to the common liquid crystal injection channel of the liquid crystal injection channel sealing material. By projecting the two transparent substrates in a part and immersing the projecting part in the liquid crystal in the liquid crystal container, the sealing material for the liquid crystal injection path having the common liquid crystal injection port and the sealing material for the plurality of liquid crystal cells are formed. The liquid crystal is injected into the plurality of liquid crystal cell sealing materials through the respective liquid crystal injection ports.

[0006]

According to the invention described in claim 1 or 2, since only the liquid crystal injection port is soaked in the liquid crystal in the liquid crystal container, the contact area with the liquid crystal in the liquid crystal container is reduced and therefore the contact area is reduced. It is possible to reduce the deterioration of the liquid crystal in the liquid crystal container by an amount corresponding to the decrease. According to the third aspect of the present invention, only one common liquid crystal injection port of the liquid crystal injection channel sealing material connected to each liquid crystal injection port of the plurality of liquid crystal cell sealing materials is provided with the liquid crystal in the liquid crystal container. Therefore, the contact area with the liquid crystal in the liquid crystal container is further reduced, and therefore the deterioration of the liquid crystal in the liquid crystal container can be further reduced.

[0007]

1 to 3 show respective manufacturing steps of a liquid crystal display device according to a first embodiment of the present invention. Therefore, a method of manufacturing the liquid crystal display device of this embodiment will be described with reference to these drawings in order.

First, as shown in FIG. 1, a long rear base substrate 11 for forming a large number of rear transparent substrates.
And a long front base substrate 12 for forming a large number of front transparent substrates. Base substrate 1
1 and 12 are formed by a thin substrate made of a transparent resin such as PET or PES and having a thickness of about 0.1 to 0.2 mm,
The sprocket holes 13 and 14 are provided at both ends in each width direction.
Are formed. In the width direction of the upper surface of the rear side base substrate 11, four liquid crystal cell sealing materials 15 for arranging liquid crystal cells are arrayed at intervals. A liquid crystal inlet 16 is provided at the center of the lower end of the liquid crystal cell sealing material 15. Further, on the upper surface of the rear-side base substrate 11, liquid crystal infiltration preventing sealing material 17 is formed at predetermined locations on both outer sides of each liquid crystal inlet 16. On the other hand, four predetermined positions in the width direction of the front side base substrate 12, that is, the portions corresponding to the respective right sides of the liquid crystal cell sealing material 15 in FIG. 1 (that is, although not shown, the upper surface of the rear side base substrate 11 is A slit 18 is formed by punching at a portion corresponding to the connection terminal provided at each predetermined position.

Now, the rear side base substrate 11 as described above
After preparing the front side base substrate 12 and the liquid crystal cell sealing material 15 of the rear side base substrate 11 as required.
Spacers (not shown) are sprayed on the inside of the container using a spray or the like. Next, the slit 1 of the front side base substrate 12
The rear side base substrate 11 and the front side base substrate 12 are bonded to each other with the sealing materials 15 and 17 in a state where the portion of the rear side base substrate 11 where the connection terminals are provided is exposed. Next, the two base substrates 1 bonded together
1 and 12 are cut at predetermined locations to obtain the one shown in FIG. 2 (hereinafter referred to as liquid crystal cell forming body 21). The cutting in this case is performed at once by punching or by a cutter provided with cutting blades corresponding to the upper and lower cutting lines of the liquid crystal cell forming body 21 shown in FIG. In the liquid crystal cell forming body 21 thus obtained, the sealing material 17 for preventing liquid crystal entry
And both base substrates 1 in the portion corresponding to the liquid crystal injection port 16 located below the liquid crystal entry prevention sealing material 17.
1, 12 are projected to form a protruding portion 22.

Next, FIG. 2 shows the case of injecting liquid crystal.
Will be described with reference to. In this case, first, the liquid crystal cell forming body 21 is placed in a vacuum chamber (not shown), and the inside of the vacuum chamber is evacuated, so that the corresponding liquid crystal cell seals are inserted through the four liquid crystal inlets 16. After applying a vacuum between the two base substrates 11 and 12 inside each of the materials 15,
A portion of the protruding portion 22 of the liquid crystal cell forming body 21 below the liquid crystal entry prevention sealing material 17 is dipped in the liquid crystal 24 in the liquid crystal container 23 arranged in the vacuum chamber, and then the vacuum chamber is set to atmospheric pressure. As a result, the liquid crystal container 23
The liquid crystal 24 in the inside is injected between the two base substrates 11 and 12 inside each of the corresponding liquid crystal cell sealing materials 15 through the four liquid crystal inlets 16, and then the liquid crystal cell forming body 21 is placed in the vacuum chamber. Take out from.

As described above, since the protruding portion 22 of the liquid crystal cell forming body 21 is immersed in the liquid crystal 24 in the liquid crystal container 23,
Even when the contact area between the liquid crystal cell forming body 21 and the liquid crystal 24 in the liquid crystal container 23 is reduced, and thus the lower end portion of the liquid crystal cell forming body 21 is dirty, the inside of the liquid crystal container 23 is reduced by the amount corresponding to the reduction of the contact area. The deterioration of the liquid crystal 24 can be reduced. Further, since the portion of the protruding portion 22 of the liquid crystal cell forming body 21 below the liquid crystal entry prevention seal material 17 is dipped in the liquid crystal 24 in the liquid crystal container 23, the lower side of the liquid crystal entry prevention seal material 17 is formed. Even if the liquid crystal 24 adheres to the inner surfaces of the two base substrates 11 and 12 around the liquid crystal injection port 16, the adhered liquid crystal 24 capillarity causes the two liquid crystal 24 above the seal material 17 for preventing liquid crystal intrusion. It is possible to prevent the liquid crystal intrusion preventing seal material 17 from trying to penetrate between the base substrates 11 and 12.

Next, the liquid crystal cell forming body 21 is cut on the upper side of the liquid crystal infiltration preventing seal material 17 along the straight lines passing through the lower ends of the four slits 18 to obtain the liquid crystal cell forming body 21 shown in FIG. To be Next, the liquid crystal injection port 16 is sealed with the sealing material 25. An example of this sealing step will be described. First, although not shown, the liquid crystal cell forming body 21
Is pressed by a pressurizing mechanism to push out a certain amount of the liquid crystal 24 injected into the liquid crystal cell sealing material 15, and then the lower end of the liquid crystal cell sealing material 15 is dipped in the sealing material in the sealing material container, Then, when the pressure applied by the pressure mechanism is released, the sealing material in the sealing material container is sucked into the liquid crystal inlet 16, and thus the liquid crystal inlet 16 is sealed with the sealing material 25. in this case,
As described above, in the liquid crystal injecting process shown in FIG. 2, the liquid crystal 24 prevents the liquid crystal 24 from intruding by the capillary phenomenon between the two base substrates 11 and 12 on the upper side of the liquid crystal intrusion preventing seal material 17. Since it is prevented by the sealing material 17, the liquid crystal 24 is not unnecessarily attached to the lower end portion of the liquid crystal cell forming body 21 in the state shown in FIG. Therefore, it is possible to omit the step of wiping and removing the liquid crystal 24 unnecessarily attached to the lower end portion of the liquid crystal cell forming body 21 before the sealing step. The liquid crystal cell forming body 2
When the sealing step is performed with the liquid crystal 24 unnecessarily attached to the lower end of 1, the liquid crystal 24 is mixed in the sealing material 25,
Even if the sealing material 25 is cured, the original strength cannot be obtained.

Next, as shown by the alternate long and short dash line in FIG. 3, the liquid crystal cell forming body 21 is cut. That is, while cutting along the right end of the slit 18 in FIG. 3,
A predetermined portion on the left side of the liquid crystal cell sealing material 15 on the left side in FIG. 3 is cut. Then Sprocket Hall 1
Unnecessary portions of the liquid crystal cell forming body 21 including 3 and 14 are removed, and four liquid crystal cells are obtained. Thus, the manufacture of the liquid crystal display device of this embodiment is completed.

Next, FIGS. 4 to 6 show respective manufacturing steps of the liquid crystal display device according to the second embodiment of the present invention. Therefore, a method of manufacturing the liquid crystal display device of this embodiment will be described with reference to these drawings in order.

First, as shown in FIG. 4, a long rear base substrate 31 for forming a large number of rear transparent substrates.
And a long front base substrate 32 for forming a large number of front transparent substrates. Base substrate 3
The sprocket holes 3 are provided at both widthwise end portions of 1 and 32.
3, 34 are formed. In the width direction of the upper surface of the rear side base substrate 31, four liquid crystal cell sealing materials 35 for arranging the liquid crystal cells are arrayed at intervals. A liquid crystal inlet 36 is provided at the center of the lower end of the liquid crystal cell sealing material 35. In addition, the rear side base substrate 31
On the upper surface of the liquid crystal injection port 36, below the four liquid crystal injection ports 36, a liquid crystal injection path seal member 37 connected to each liquid crystal injection port 36 is provided.
Are formed. One common liquid crystal injection port 38 is provided at the center of the lower end of the liquid crystal injection path sealing material 37.
Further, on the upper surface of the rear side base substrate 31, liquid crystal infiltration preventing sealing material 39 is formed at predetermined locations on both outer sides of the common liquid crystal injecting opening 38 of the liquid crystal injecting passage sealing material 37. On the other hand, slits 40 are formed at four predetermined positions in the width direction of the front side base substrate 32.

Now, the rear side base substrate 31 as described above
After the front side base substrate 32 is prepared, the liquid crystal cell sealing material 35 of the rear side base substrate 31 is provided as necessary.
Spacers (not shown) are sprayed on the inside of the container using a spray or the like. Next, the slit 4 of the front side base substrate 32
The rear side base substrate 31 and the front side base substrate 32 are sealed with sealing materials 35, 37, 39 in a state in which the portion of the rear side base substrate 31 where the connection terminals are provided is exposed.
Pasted through. Next, the bonded base substrates 31 and 32 are cut at a predetermined position to obtain the one shown in FIG. 5 (hereinafter referred to as the liquid crystal cell forming body 41). In the liquid crystal cell forming body 41 thus obtained, both base substrates 31 in the portion corresponding to the liquid crystal infiltration preventing sealing material 39 and the common liquid crystal injecting port 38 located below the liquid crystal infiltration preventing sealing material 39. , 32 are projected, and the protruding portion 4
Forming 2.

Next, FIG. 5 shows the case of injecting liquid crystal.
Will be described with reference to. In this case, first, the liquid crystal cell forming body 41 is placed in a vacuum chamber (not shown), and the inside of the vacuum chamber is evacuated to form a vacuum, so that the liquid crystal injection channel sealing material 37 having one common liquid crystal injection port 38 is formed. And the corresponding sealing material 35 for liquid crystal cells through the four liquid crystal inlets 36.
After a vacuum is applied between the two base substrates 31 and 32 on the inside of each of the above, the portion of the protruding portion 42 of the liquid crystal cell forming body 41 below the liquid crystal entry prevention sealing material 39 is placed in the vacuum chamber. The liquid crystal 44 in the liquid crystal container 43 is immersed in the liquid crystal container 43, and then the vacuum chamber is set to the atmospheric pressure, so that the liquid crystal 44 in the liquid crystal container 43 has one common liquid crystal injection port 38 due to the pressure difference. And the corresponding sealing material 35 for liquid crystal cells through the four liquid crystal inlets 36.
It is injected between the two base substrates 31 and 32 on the inner side of each, and then the liquid crystal cell forming body 41 is taken out from the vacuum chamber.

As described above, since one protruding portion 42 of the liquid crystal cell forming body 41 is immersed in the liquid crystal 44 in the liquid crystal container 43, the liquid crystal cell forming body 41 and the liquid crystal 44 in the liquid crystal container 43.
Therefore, even if the lower end of the liquid crystal cell forming body 41 is dirty, the deterioration of the liquid crystal 44 in the liquid crystal container 43 can be further reduced. Further, since the portion of the protruding portion 42 of the liquid crystal cell forming body 41 below the liquid crystal entry preventing sealing material 39 is dipped in the liquid crystal 44 in the liquid crystal container 43, similar to the case of the first embodiment. , 2 on the upper side of the liquid crystal entry prevention sealing material 39
The liquid crystal 44 is prevented from entering between the base substrates 31 and 32 due to the capillary phenomenon so that the sealing material 39 for preventing liquid crystal entry
Can be prevented by.

Next, as shown by reference numeral 45 in FIG. 6, each liquid crystal injection port 36 of the four liquid crystal cell sealing members 35.
Both base substrates 31 and 32 in the portion of 4 are welded to each other by using an ultrasonic welding device (not shown).
The two liquid crystal inlets 36 are sealed. Next, the liquid crystal cell forming body 41 is cut along the straight line passing through the lower end portions of the four slits 40 on the upper side of the liquid crystal injection path sealing material 37, and is also cut as indicated by the alternate long and short dash line in FIG. Then, the unnecessary portion of the liquid crystal cell forming body 41 including the liquid crystal injection passage sealing material 37 and the liquid crystal intrusion preventing sealing material 39 is removed, and the unnecessary portion of the liquid crystal cell forming body 41 including the sprocket holes 33 and 34 is removed. At the same time as the removal, four liquid crystal cells are obtained, thus completing the manufacture of the liquid crystal display device of this embodiment.

In the second embodiment, the liquid crystal injection port 36 is sealed by welding both base substrates 31 and 32 in the portion indicated by reference numeral 45 in FIG. 6, but the invention is not limited to this. is not. For example, after the liquid crystal is injected, the liquid crystal cell forming body 41 shown in FIG. 5 is cut along the straight line passing through the lower ends of the four slits 40 on the upper side of the liquid crystal injection path sealing material 37, and then the first embodiment. You may make it seal like the case of. Further, after such sealing, the same applies to the case of the first embodiment, but the sealing material may be cut again in order to prevent it from appearing on the outer surface. Further, instead of the method of immersing the sealing material in the sealing material container, the sealing material may be applied using a comb-teeth-shaped application member.

[0021]

As described above, claim 1 or 2
According to the invention described above, since only the liquid crystal injection port is immersed in the liquid crystal in the liquid crystal container, the contact area with the liquid crystal in the liquid crystal container is reduced, and accordingly, the liquid crystal container is reduced by the amount corresponding to the decrease in the contact area. The deterioration of the liquid crystal inside can be reduced.
According to the invention described in claim 4, only one liquid crystal injection port of the liquid crystal injection channel sealing material connected to each liquid crystal injection port of the plurality of liquid crystal cell sealing materials is used as the liquid crystal in the liquid crystal container. Since it is soaked, the contact area with the liquid crystal in the liquid crystal container is further reduced, and therefore the deterioration of the liquid crystal in the liquid crystal container can be further reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing a state in which two base substrates are attached to each other with a sealing material in the manufacture of the liquid crystal display device according to the first embodiment of the present invention.

FIG. 2 is a diagram for explaining liquid crystal injection in the first embodiment.

FIG. 3 is a diagram for explaining a case where a final liquid crystal cell is obtained in the first embodiment.

FIG. 4 is a diagram showing a state in which two base substrates are bonded to each other with a sealing material in manufacturing the liquid crystal display device according to the second embodiment of the present invention.

FIG. 5 is a diagram for explaining the injection of liquid crystal in the second embodiment.

FIG. 6 is a diagram for explaining a case where a final liquid crystal cell is obtained in the second embodiment.

FIG. 7 is a diagram for explaining injection of liquid crystal when manufacturing a conventional liquid crystal display device.

[Explanation of symbols]

 11 Rear Base Substrate 12 Front Base Substrate 15 Liquid Crystal Cell Sealing Material 16 Liquid Crystal Inlet 17 Liquid Crystal Intrusion Preventing Sealing Material 21 Liquid Crystal Cell Forming Body 22 Projection Part 23 Liquid Crystal Container 24 Liquid Crystal

Claims (7)

[Claims] 1. The two transparent substrates are bonded together via a liquid crystal cell sealing material having a liquid crystal injection port, and the two transparent substrates in a portion corresponding to the liquid crystal injection port are projected, and the projecting portion is formed. A method for manufacturing a liquid crystal display device, characterized in that the liquid crystal is injected into the liquid crystal cell sealing material through the liquid crystal injection port by immersing the liquid crystal in the liquid crystal in the liquid crystal container. 2. The two transparent substrates are bonded together via a plurality of liquid crystal cell sealing materials that have liquid crystal inlets on the same side and are arranged to arrange liquid crystal cells. The two transparent substrates at the portions corresponding to the liquid crystal inlets are projected, and these protruding portions are immersed in the liquid crystal in the liquid crystal container, so that the plurality of liquid crystal cell sealing materials are passed through the plurality of liquid crystal inlets. A method for manufacturing a liquid crystal display device, which comprises injecting liquid crystal into the interior of the liquid crystal display device. 3. The invention according to claim 1 or 2,
A liquid crystal intrusion prevention seal material is provided on both outer sides of the liquid crystal injection port in the protruding portions of the two transparent substrates, and a lower portion of these liquid crystal intrusion prevention seal materials is immersed in the liquid crystal in the liquid crystal container. A method for manufacturing a characteristic liquid crystal display device. 4. A plurality of liquid crystal cell sealing materials, each having a liquid crystal injection port on the same side and arranged to arrange liquid crystal cells, and are connected to the respective liquid crystal injection ports of these liquid crystal cell sealing materials. And the two transparent substrates are bonded to each other via a liquid crystal injection channel sealing material having one common liquid crystal injection port, and at the portion of the liquid crystal injection channel sealing material corresponding to the common liquid crystal injection port. By projecting two transparent substrates and immersing the projecting portion in the liquid crystal in the liquid crystal container, each of the liquid crystal injecting passage sealant having the common liquid crystal injecting port and each of the plurality of liquid crystal cell sealants is injected. A method of manufacturing a liquid crystal display device, comprising injecting liquid crystal into the plurality of liquid crystal cell sealing materials through an inlet. 5. The invention according to claim 4, wherein a sealing material for preventing liquid crystal intrusion is provided on both outsides of the common liquid crystal injection port of the sealing material for the liquid crystal injection path in the protruding portions of the two transparent substrates, A method for manufacturing a liquid crystal display device, characterized in that the lower part of the intrusion prevention sealant is immersed in the liquid crystal in the liquid crystal container. 6. The invention according to claim 4 or 5,
After the liquid crystal is injected, the two transparent substrates in the respective liquid crystal injection port portions of the plurality of liquid crystal cell sealing materials are welded to each other, and a method for manufacturing a liquid crystal display device. 7. The method for manufacturing a liquid crystal display device according to claim 6, wherein the welding is ultrasonic welding.