JPH06235925A - Manufacture of liquid crystal display element - Google Patents

Abstract

PURPOSE:To manufacture a liquid crystal display element taking no long time for sealing liquid crystal, causing no pollution of liquid crystal and no mixing of refuse, and not requiring the precision of the liquid crystal drip quantity. CONSTITUTION:A seal material 3 provided with a liquid crystal discharge port 5 in advance is arranged at least on one of electrode substrates 1, 2 facing each other, a required quantity or above of liquid crystal 6 is dripped on the electrode substrate 1, then two electrode substrates 1, 2 are stuck together in vacuum, excess liquid crystal is discharged, and a sealing agent 7 is applied. The liquid crystal injection and sealing can be performed in a short time, the pollution of the liquid crystal 6 and the mixing of refuse are prevented, the precision of the drip quantity of the liquid crystal 6 is not required, and a liquid crystal display element can be easily manufactured.

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 element used as a thin, lightweight and low power consumption display.

[0002]

2. Description of the Related Art Today, liquid crystal display devices are widely used in various fields as thin, lightweight, and low power consumption displays, and their usage will increase in the future.

Conventionally, the following methods have been proposed as a method for manufacturing the liquid crystal display device.

(A) As shown in FIGS. 3 (a) to 3 (e), two electrode substrates 10 and 11 arranged to face each other are sealed with a sealing material 12.
A method of making a container having a sandwich type cell structure by adhering and fixing using a liquid crystal, and enclosing and sealing the liquid crystal by means of capillary action, pressurization, or vacuum from the liquid crystal injection port 14 provided in advance in the sealing section. . In the figure, 13 is a spacer for keeping the substrate spacing constant, and 16 is a sealing resin.

(B) As shown in FIGS. 4 (a) to 4 (d), a sealing material 19 is arranged on at least one of the two electrode substrates 17 and 18 which face each other, and a liquid crystal 22 is fixed on the electrode substrate 17. A method of dropping a certain amount and bonding the two electrode substrates 17 and 18 in a vacuum.

[0006]

However, in the above method (A), since the end face of the injection port always contacts the liquid crystal, the liquid crystal is contaminated or dust is mixed, which causes quality trouble of the liquid crystal display panel. Become. Further, in this method, it takes a long time to inject the liquid crystal, and it sometimes takes 60 minutes or more for a large-sized liquid crystal display device, for example.
Furthermore, when the electrode substrate is made of a flexible material such as a film, the upper and lower electrode substrates come into contact with each other due to a pressure difference during liquid crystal injection, resulting in poor alignment.

In the method (B), the method disclosed in Japanese Patent Laid-Open No. 62-
Although measures have been taken to overcome the problems of the above method (A) as disclosed in Japanese Patent No. 89025, there is a problem in that display unevenness occurs when the liquid crystal dropping amount accuracy is low. . On the other hand, if the spacer is not fixed to the electrode substrate, the spacer also moves due to the flow of the liquid crystal during dropping / bonding, which causes a problem that the gap becomes nonuniform.

The present invention has been made to solve the above-mentioned problems. It takes no time to fill the liquid crystal, the liquid crystal is not contaminated and dust is not mixed, and the accuracy of the liquid crystal dropping amount is improved. It is an object of the present invention to provide a novel manufacturing method that does not require it.

[0009]

In order to achieve this object, a method of manufacturing a liquid crystal display element according to the present invention is such that a sealing material having a liquid crystal discharge port is provided on at least one of two electrode substrates facing each other. Put more than necessary amount of liquid crystal on the electrode substrate,
After that, the above-mentioned two electrode substrates are bonded together in a vacuum, and excess liquid crystal is discharged. In addition, before dropping the liquid crystal, adhesive spacers (those coated with a thermoplastic resin or a thermosetting resin in advance) are uniformly arranged on the electrode substrate and heated to adhere to the electrode substrate.

[0010]

According to this method, the liquid crystal is placed on the electrode substrate,
After that, by quickly combining the electrode substrates in a vacuum and discharging the excess liquid crystal, the liquid crystal can be injected and sealed in a short time, and the accuracy of the liquid crystal dropping amount is not required, and furthermore, the adhesive spacer should be used. Since it is possible to prevent the spacers from moving due to the flow of the liquid crystal at the time of dropping / bonding, it is possible to easily obtain a uniform cell gap, and its utility value is extremely great.

[0011]

1 (a) to 1 (e) are conceptual views showing an embodiment of a manufacturing process according to the present invention, and FIG. 2 is a sectional view of an adhesive spacer used in the embodiment. In this embodiment, a silica type spacer is used as the spacer, and an acrylic resin having an adhesion temperature of about 150 ° C. is used as the coating resin.

First, as shown in FIGS. 1 (a) and 1 (b), an electrode substrate made of glass or the like on which a treatment for aligning liquid crystal molecules is completed (a pattern is formed by transparent electrodes, but it is omitted in the drawing). Prepare 1 and 2,
The sealing material 3 is printed on one of the electrode substrates 1 by a screen printing method. Here, the sealing material 3 is provided with a liquid crystal discharge port 5 in advance. Adhesive spacers 4 are uniformly arranged on the other electrode substrate 2. Next, as shown in FIG. 1C, one drop or a few drops of the liquid crystal 6 is dripped at the substantially central portion of the portion surrounded by the sealing material 3 on the one electrode substrate 1. Then, after the excess liquid crystal is discharged from the liquid crystal discharge port 5, a sealing material 7 is applied to seal the liquid crystal.

At this time, the liquid crystal 6 is dropped by using a high-precision micro-dispensing syringe, a pipette, a constant-dispensing pump, or the like.
Add a little more than the amount used. Here, it should be noted that if the dripping place is too close to the sealing material 3, the liquid crystal 6 flows to the sealing portion before the electrode substrates 1 and 2 are bonded together, and when the electrode substrates 1 and 2 are bonded together. That is, the seal part is broken or the liquid crystal 6 overflows to the outside of the seal part. According to the present embodiment, liquid crystal injection and sealing can be performed in a short time,
Moreover, it was confirmed that a uniform cell gap could be easily obtained. Next, FIG. 2 will be described. Reference numeral 8 is a thermoplastic resin or thermosetting resin, and 9 is a spacer body. As shown in (a) and (b) by the heating action, the coated resin is melted or softened, and the effect of adhering and fixing to the electrode substrate can prevent the movement of the spacer due to the flow of liquid crystal.

[0014]

As described above, according to the present invention, by providing the liquid crystal discharge port in the seal portion on the electrode substrate and providing the spacer with adhesiveness, (1) liquid crystal injection / sealing can be performed in a short time. it can. (2) The contamination of liquid crystal and the mixing of dust are eliminated. (3) The liquid crystal can be easily manufactured without requiring the accuracy of the liquid crystal dropping amount. (4) By using an adhesive spacer, it is possible to prevent the movement of the spacer due to the flow of liquid crystal during dropping / bonding, and to obtain an excellent liquid crystal display device manufacturing method that can obtain a uniform cell gap. It can be realized.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a manufacturing process for explaining a manufacturing method of a liquid crystal display element in one embodiment of the present invention.

FIG. 2 is a sectional view of an adhesive spacer coated with a thermoplastic resin or a thermosetting resin in the example.

FIG. 3 is a conceptual diagram showing a manufacturing process for explaining a conventional liquid crystal display device manufacturing method (vacuum injection method).

FIG. 4 is a conceptual diagram showing a manufacturing process for explaining a conventional liquid crystal display device manufacturing method (liquid crystal dropping method).

[Explanation of symbols]

 1, 2 electrode substrate 3 sealing material 4 adhesive spacer 5 liquid crystal discharge port 6 liquid crystal 7 sealing material 8 thermoplastic resin or thermosetting resin 9 spacer body

Claims (2)

[Claims] 1. A sealing material having a liquid crystal discharge port is provided on at least one of two opposing electrode substrates, and a required amount of liquid crystal is dropped onto the electrode substrates, and then the two electrode substrates are vacuumed. A method for manufacturing a liquid crystal display element, which is characterized in that the liquid crystal is pasted and pressed to discharge excess liquid crystal from the liquid crystal discharge port. 2. An adhesive spacer coated with a resin is sprinkled on at least one of two opposing electrode substrates,
2. The method for manufacturing a liquid crystal display element according to claim 1, wherein the liquid crystal is dropped and liquid crystal is dropped and the two electrode substrates are bonded together in a vacuum, after being adhered and fixed to the electrode substrate by heating.