JPH02310513A - Production of film liquid crystal - Google Patents

Abstract

PURPOSE:To allow even the formation of the cell of a liquid crystal display element for which thin and resilient film substrates are used to be efficiently executed by the system and equipment similar to the conventional system and equipment by crimping the cell from both sides via elastic bodies by using smooth plates and injecting a liquid crystal into the cell in the pressurized contact state, then sealing the port. CONSTITUTION:Transparent electrode 2, 2' are formed on the surfaces of the transparent film substrates 1, 1' and the peripheral parts thereof are fixed by a sealant 5 via spacers 4 for maintaining the specified inter-electrode spacing in such a manner that the electrodes 2, 2' face each other, then the liquid crystal 3 is injected into the spacing therebetween and the port is sealed to form the liquid crystal cell 6. The liquid crystal cell 6 is crimped from both sides via the elastic bodies 7 by the smooth plates 8 and is brought into pressurized contact. The liquid crystal is injected into the cell and the port is sealed. The liquid crystal element is efficiently produced in this way by utilizing the production process and equipment for liquid crystals by using the conventional glass substrates as they are without generating the problems intrinsic to the film substrates 1, 1', even when the thin and resilient film substrate is used as the substrate 1, 1'.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to a film type substrate that can be made thinner and lighter by using a film substrate instead of a conventional glass substrate, and can be used in a wider range of applications because it does not break. The present invention relates to a method for manufacturing a liquid crystal element.

Conventional technology A cell is formed by bonding a glass substrate with a transparent electrical conductor with a sealing resin having an injection port through a spacer corresponding to the required distance, and after reducing EE or creating a vacuum, the injection port is connected to a liquid crystal container. A commonly used method is to fill the liquid crystal into the cell through the injection port by bringing the vacuum system to atmospheric pressure, and then sealing the cell. Basically, the same method is used when using a film substrate. It is applied.

Problems to be Solved by the Invention Since the film substrate is thin and flexible, the injection port becomes narrow when liquid crystal is injected, and the cells bulge in a drum shape on both sides. Operations such as these cannot be performed as smoothly as with glass substrates, and the injected liquid crystal tends to enter in excess, causing variations in the spacing between electrodes, resulting in noticeable display unevenness. Spacers are generally used to equalize the gap between liquid crystal cells, but although they can prevent inward bending, they are vulnerable to outward bending. Conventional liquid crystal cells with glass substrates do not bend outward because they use substrates with a thickness of about 1 ml, which is a unique problem when manufacturing cells with uniform gaps using film substrates. Met.

Means to Solve the Problems Therefore, the present invention applies smooth substrates with a thickness and strength that do not bend during conventional liquid crystal injection operations on both sides, and moreover, the effect appears uniformly over the details, improving reproducibility. Liquid crystal is injected under pressure with an elastic body interposed between the two. Also, depending on the size and shape of the cell, it may be effective to apply pressure in two stages to prevent air bubbles from entering the cell during sealing, and then seal the cell with further pressure applied during sealing after injection. Furthermore, in order to efficiently manufacture cells, it is practical to use ultraviolet rays or a photocurable resin as a sealing agent, and to select light-transmitting materials for the smooth plate and elastic body to be pressurized. Also, if you use a thick silicone rubber plate,
Both functions can be achieved without a smooth plate, and further simplification is possible.

Function As explained above, liquid crystal is injected while being held and pressed from both sides using smooth plates via an elastic body.

By sealing, cell formation of a liquid crystal display element using a thin and flexible film substrate can be easily and efficiently performed using the same method and equipment as in the case of conventional glass substrates. Since the material and thickness of the film used differs depending on the application, cells with uniform gaps can always be formed by interposing an elastic body with the hardness, thickness, and smoothness that is optimal for the physical properties. becomes possible.

Example FIG. 3 shows a sectional view of the main purchasing parts of the liquid crystal cell.

Transparent electrodes 2, 2' in a desired pattern are formed on the surfaces of transparent film substrates 1, 1', and a sealing agent is applied to the periphery via a spacer 4 to make the electrode gap constant so that the electrodes face each other. 6, and liquid crystal 3 is injected into the gap and sealed to form a liquid crystal cell/I/6.

In cells using conventional glass substrates, glass having a thickness of 1.1 mm is generally used, but in the case of film liquid crystals, transparent film substrates having a thickness of about 0.15 to 0.2 .mu.mm are used.

Here, as an example, a polarizer is sandwiched between PE5 (polyethersulfone) films, and an indium oxide-based transparent electrode 2.2 is placed on a 0.2 m film substrate 1. ', with a diameter of 5.6 μm
A liquid crystal cell #6 was formed by adhering with an epoxy sealing resin 6 with a resin ball 4 interposed therebetween, leaving a portion of the liquid crystal injection port 1o.

Next, as shown in FIG. 1 (iL), a thick 3
Using plates 8 made of stainless steel with a smooth surface of mm in diameter, the liquid crystal cell 6 is held and pressed from both sides and pressurized with a force of 1 kg, and the liquid crystal is injected from the injection port 1o by a conventionally commonly used decompression method. After injection, the cell was sealed and the cell was completed.

As a practical example, a cell was formed by the same method using a pTLs film without a polarizing plate as a substrate. After sealing, a polarizing plate and, if necessary, a reflecting plate were attached to both sides of the cell to complete the cell. Also.

As shown in FIG. 1(b), if an elastic body 7 made of silicone rubber with a thickness of approximately smm is used, it is more effective as it can fulfill both roles without using a smooth plate.

In this example, an ultraviolet or line-curable adhesive was used as the sealant 6, a sheet of transparent polycarbonate with a thickness of 10 μm was used as the elastic body 7, and a 3 mm thick plate of the same material was used as the smooth plate 8. After printing the sealant,
It can be cured by irradiating ultraviolet rays from both sides while being held between the smooth plates and pressurized, and liquid crystal injection and sealing can be performed continuously as it is, allowing efficient manufacturing.

Furthermore, Fig. 2 is an example of a method for improving the productivity of five or more embodiments. It is made so that it can be processed.

Effects of the Invention As described above, according to the present invention, a flexible thin film can be applied to a substrate by using a thick elastic plate or by sandwiching and press-contacting, injecting and sealing from both sides with a smooth plate through an elastic body. Even when used as a liquid crystal substrate, problems unique to film substrates do not arise; it can be manufactured efficiently by using the conventional manufacturing method and equipment for liquid crystals using glass substrates. Furthermore, this method eliminates display irregularities due to variations in cell spacing that tend to occur in the case of film liquid crystals, making it possible to produce high-quality, thin, and lightweight film liquid crystal elements at a high yield.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing a method for manufacturing a film liquid crystal device according to an embodiment of the present invention, FIG. 2 is a schematic purchasing diagram showing a method for manufacturing a film liquid crystal device according to an embodiment of the present invention, and FIG. FIG. 3 is an open cross-sectional view of a liquid crystal cell. 1.1'...Transparent substrate, 2,2'...
Transparent electrode, 3...Liquid crystal +4...Spacer, 6...Sheet TV agent, e...Liquid crystal cell,
7...Elastic body, 8...Smooth plate, 1°...
...Liquid crystal inlet.

Claims (5)

[Claims] (1) A method for producing a film liquid crystal element, which comprises interposing a liquid crystal between two film substrates having transparent electrodes, and applying pressure from both sides via an elastic body. (2) The method for manufacturing a film liquid crystal element according to claim 1, wherein the liquid crystal is injected and sealed while being sandwiched between smooth plates via an elastic body and under pressure. (3) The method for producing a film liquid crystal element according to claim 2, further comprising sealing the liquid crystal by applying pressure after injecting the liquid crystal. (4) The method for manufacturing a film liquid crystal device according to claim 1, characterized in that a sheet of soft elastic plastic or rubber is used as the elastic body. (5) Claim 1 characterized in that a transparent elastic body and a smooth plate are used, and a photocurable resin is used as a sealant and a sealant.
The method for manufacturing the film liquid crystal device described above.