JPH05127179A - Production of liquid crystal display element - Google Patents

Abstract

PURPOSE:To easily produce the liquid crystal display element having a uniform gap by printing the circumference of a substrate having transparent electrodes to a frame shape with a sealing material, dropping a liquid crystal onto the surface on a transparent electrode side and spraying spacer materials. CONSTITUTION:An oriented film is formed on one sheet of a substrate provided with the transparent electrodes and is subjected to a rubbing treatment. The sealing material 2 is printed by using a UV curing type adhesive on the other substrate 1. A liquid crystal material 4 is dropped to the inside surface of this seal. The spacer materials 7 consisting of a spherical resin are sprayed by using a spacer spraying device 5 onto the substrate 1 dropped with the liquid crystal. The spacer materials 7 can be sprayed by measuring the prescribed amt. thereof and blowing the spacer materials out of a spraying nozzle 6 by compressed air, etc. After the spacer materials 7 are sprayed, the substrate to be disposed opposite is placed thereon from above and a uniform pressure is applied on the substrate; thereafter, the sealing material 2 is irradiated with UV rays, by which the sealing material can be cured. The movement and flocculation of the spacer materials 7 in the liquid crystal are prevented and the uniform gap is formed by spraying the spacer materials 7 after dropping of the liquid crystal in such a manner.

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 method of manufacturing a liquid crystal element by printing a sealant on one substrate, dropping liquid crystal, and then bonding the other substrate together, conventionally, a spacer is used after printing a sealant. It was sprayed and the liquid crystal was dripped.

In addition to this, for example, JP-A-62-2
As disclosed in Japanese Patent No. 47335, a method has been considered in which a spacer material in which a spacer material is dispersed in advance is dropped on a substrate.

[0004]

However, in the former method described above, the spacer material is moved and further agglomerated in the process in which the liquid crystal spreads on the substrate surface, so that the spacer material does not exist uniformly. As a result, there is a problem in that the cell gap has unevenness such as unevenness and point defects (lumps of spacer material).

Further, although the spacer material can be uniformly dispersed in the liquid crystal by the latter method described above, when the spacer material is dropped on the substrate, the tendency of the spacer material to aggregate at the liquid crystal interface can be suppressed. However, as shown in FIG. 4, there is a problem that the spacer material gathers particularly near the liquid crystal development interface, resulting in a defect such as a defective appearance.

[0006]

According to the method of manufacturing a liquid crystal display element of the present invention, a step of forming a substrate having a transparent electrode subjected to an alignment treatment, and the periphery of the substrate is printed in a frame shape with a sealing material. It is characterized in that the step, the step of dropping the liquid crystal on the surface of the substrate on which the transparent electrode is provided, and the step of spraying the spacer material having a uniform and predetermined gap on the liquid crystal are sequentially performed.

In another manufacturing method, a transparent electrode subjected to an orientation treatment is formed, a sealing material is printed around the substrate, and a liquid crystal is dropped on the surface of the transparent electrode side. An electrode is formed, and a substrate on which a spacer material having a uniform and predetermined gap is dispersed is formed on the surface of the transparent electrode side, and the substrate on which the liquid crystal is dropped and the substrate on which the spacer material is dispersed are formed on each substrate. It is characterized in that the transparent electrodes are attached at positions facing each other.

[0008]

The manufacturing method of the present invention includes the steps of forming a substrate having a transparent electrode subjected to an orientation treatment, printing the periphery of the substrate in a frame shape with a sealing material, and forming the transparent electrode of the substrate. Since the step of dropping the liquid crystal on the surface and the step of spraying the spacer material having a uniform and predetermined gap on the liquid crystal are sequentially performed, the gap material dispersed in the liquid crystal does not move or aggregate.

In another manufacturing method of the present invention, a transparent electrode subjected to an alignment treatment is formed, a sealing material is printed on the periphery thereof, and then a liquid crystal is dropped on the transparent electrode side surface, and the alignment treatment is performed. A transparent electrode is formed on the transparent electrode side, and a substrate on which a spacer material having a uniform and predetermined gap is dispersed is formed on the surface on the transparent electrode side. Since the transparent electrodes of the substrate are bonded to the positions facing each other, the same effect as described above can be obtained.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. Example 1 An alignment film (polyimide alignment film) is formed on one substrate having a transparent electrode, and a rubbing treatment is performed. Next, as shown in FIG. 1, a sealing material 2 is printed on the other substrate 1 using an ultraviolet curable adhesive. A liquid crystal material 4 (nematic liquid crystal) was dropped on the inner surface of the seal of the substrate 1 using spots 3 as shown in FIG. The drop amount is obtained in advance from the liquid crystal enclosed volume.

A spacer material 7 made of spherical resin having a particle diameter of about 8 μm was dispersed on the substrate 1 onto which the above liquid crystal had been dropped by using the spacer dispersing device 5 shown in FIG. A predetermined amount of the spacer material can be measured and sprayed from the spray nozzle 6 with compressed air, nitrogen gas or the like.

After the spacer material 7 was sprayed, the opposing substrate was placed from above, a uniform pressure was applied, and then the sealing material 2 was cured by irradiating with ultraviolet rays. Then, the opening 1a was sealed with an adhesive.

As shown above, since the spacer material is sprayed after the liquid crystal is dropped, aggregation of the spacer material does not occur due to the movement of the liquid crystal and the spacer material due to the interface as in the conventional example, and a uniform cell gap is obtained. I was able to get a nice appearance. Moreover, since it is the spraying of the spacer material after the liquid crystal is dropped,
It was possible to prevent the spacer material from being stiffened by the charging (remarkably generated during the rubbing treatment) generated when the liquid crystal was sprayed on the substrate without being dropped (static elimination effect by dropping the liquid crystal).

Two substrates were prepared in the same manner as in Example 1, a sealant was printed on one substrate, liquid crystal was dropped on the other substrate, and spacers were sprayed on the other substrate by the spacer spraying device 5 shown in FIG. , The two substrates are bonded together under constant pressure,
The sealing material irradiated with ultraviolet rays was cured. After that, the opening was sealed with the same adhesive as in Example 1 above.

By manufacturing by such a method, there is no movement of the spacer material when the liquid crystal is developed, and a uniform cell gap,
A good appearance can be obtained, and since the steps from seal printing to liquid crystal dropping and the step of spraying spacers can be performed in parallel, productivity is improved.

[0016]

As described above, the method of manufacturing a liquid crystal display device of the present invention comprises the steps of forming a substrate having a transparent electrode subjected to an alignment treatment, and printing the periphery of the substrate with a sealing material in a frame shape. The step of spraying a liquid crystal on the surface of the substrate on which the transparent electrode is provided, and the step of spraying a spacer material having a uniform gap on the liquid crystal are carried out in sequence. The material does not move or aggregate, and a liquid crystal display device having a uniform gap and excellent display quality can be easily manufactured. Also,
Another manufacturing method of the present invention is to form a transparent electrode that has been subjected to an alignment treatment, print a sealant around the substrate, and drop a liquid crystal on the surface of the transparent electrode side, and a transparent electrode that has been subjected to the alignment treatment. To form a substrate on which a spacer material having a uniform and predetermined gap is dispersed on the surface on the transparent electrode side, and the transparent electrode of the substrate is formed on the substrate on which the liquid crystal is dropped and the substrate on which the spacer material is dispersed. Since they are attached to the positions facing each other, the same action and effect as described above can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a substrate on which a sealing material is printed in a liquid crystal display element, regarding a method for manufacturing a liquid crystal display element of the present invention.

FIG. 2 is an explanatory view showing a step of dropping liquid crystal on a substrate on which a sealing material is printed, in the method for manufacturing a liquid crystal display element of the present invention.

FIG. 3 is an explanatory view showing a spacer material spraying process on a substrate by a spacer spraying device in the liquid crystal display element manufacturing method of the present invention.

FIG. 4 is a schematic explanatory diagram showing a movement phenomenon of a spacer material after dropping a liquid crystal onto a substrate in a conventional method for manufacturing a liquid crystal display element.

[Explanation of symbols]

 1 Substrate 1a Opening 2 Sealing Material 3 Dropper 4 Liquid Crystal 5 Spacer Spraying Device 6 Spraying Nozzle 7 Spacer

Claims (2)

[Claims] 1. A step of forming a substrate having a transparent electrode subjected to an orientation treatment, a step of printing the periphery of the substrate in a frame shape with a sealing material, and a liquid crystal on a surface of the substrate having the transparent electrode. A method for manufacturing a liquid crystal display device, which comprises sequentially performing a step of dropping and a step of spraying a uniform spacer material having a predetermined gap on the liquid crystal. 2. A transparent electrode that has been subjected to an alignment treatment is formed, a sealing material is printed on the periphery thereof, and then a liquid crystal is dropped on the transparent electrode side surface, and a transparent electrode that has been subjected to the alignment treatment is formed. A substrate on which a spacer material having a uniform and predetermined gap is dispersed is formed on the surface on the transparent electrode side, and the substrate on which the liquid crystal is dropped and the substrate on which the spacer material is dispersed have their transparent electrodes facing each other. A method for manufacturing a liquid crystal display element, which is characterized in that the liquid crystal display element is bonded to a desired position.