JPS6041018A - Manufacture of cell for liquid crystal display - Google Patents

Abstract

PURPOSE:To handle a plastics film respective processes similar to a glass substrate by fixing the plastics film to a rigid frame. CONSTITUTION:The transparent film 2 coated entirely with ITO is collected to prescribed size, and adhered with adhesive fixedly to the frame 1 made of stainless steel to constitute a substrate. Consequently, when photoresist is applied through a roll coater 5, the film 2 is fixed by suction through a porous body 4 formed on a support 3 connecting with a vacuum system, and the film is coated with the resist stably even during the roll coating. When the film substrate is treated in a solution such as an etching tank or a resist removing process, substrates fixed in numbers of frames are stored in a carrier 6 and handled simultaneously, no film 2 flexes to contact the frame 1 or another film 2 and damage, and the whose substrate does not float. The substrates are fixed by suction and handled in the processes of oriented film coating, rubbing orientation, printing of a seal material, etc., to facilitate the handling.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a liquid crystal display element, and more particularly to a method for manufacturing a liquid crystal display cell using a plastic film as a substrate.

BACKGROUND ART Conventionally, a liquid crystal display element has been used in which a liquid crystal is sealed in a cell using a glass substrate coated with a transparent conductive film such as tin oxide or indium oxide. When this device is stored in a thin case like a pocket calculator or a pocket calculator, the liquid crystal display cell has the disadvantage of being easily torn by external force.In addition, when a reflective plate is installed on the back of the cell to make it a 2-reflection type device. If the back substrate is thick, the display image will be misaligned between the display surface and its shadow, resulting in a so-called double image, resulting in a disadvantage of deteriorating display quality. In order to reduce the degree of this deviation, it is necessary to reduce the thickness of the back substrate, but when using a glass substrate, it is expensive, easy to tear, difficult to handle, and has a low yield when forming cells. This results in disadvantages such as: On the other hand, plastic film has 1
Films with a thickness of about 0.00 μm are generally commercially available, are easy to manufacture, are cheaper than thin glass sheets, and do not have the disadvantage of being easily broken. So display appearance, fill
Plastic substrates are considered to be more advantageous than glass substrates in terms of i-rating, resistance to tearing, thinner elements, and lighter weight.

However, since conventional manufacturing equipment for liquid crystal display cells is based on the premise of handling glass substrates,
It is not designed to handle lightweight substrates like plastic films, which are not rigid, tend to curl, and are not designed to handle lightweight substrates.In order to efficiently produce liquid crystal cells using film as a substrate, a specialized manufacturing method is required. , equipment, etc. will be required. However, in order to manufacture liquid crystal display elements, ITO
There are many processes such as vapor deposition, patterning, formation of alignment film, alignment treatment, printing of sealant, formation of cells by heat and pressure bonding, and encapsulation of liquid crystal. This requires investment and increases manufacturing costs.

In order to minimize the increase in manufacturing costs due to the introduction of new manufacturing equipment, the present invention makes effective use of the conventional manufacturing line for liquid crystal display cells using glass substrates, and creates liquid crystal display cells using plastic film as a substrate. The present invention relates to a method of manufacturing cells inexpensively and efficiently. That is, the present invention
In this method, a plastic film is fixed to a rigid frame-like frame so that each process can be handled in the same way as a glass substrate.

FIG. 1 shows a perspective view of an example of the fixed frame (1).

The material for the frame is rigid and appropriately heavy paper.
Stable to acids and cleaning solvents, tL is sufficient, and metals, ceramics, and plastics are useful. In addition, their surfaces may be coated with acid-resistant and solvent-resistant materials.8 Figure 2 shows a frame (1) coated with a film (2).
) is a cross-sectional view when the film and the frame are fixed together and near 1, and the film and the frame may be fixed on the whole or a part of the peripheral edge with an adhesive, or with an appropriate fastener. It may be fixed with a tool.

Next, embodiments according to the present invention will be described.

A transparent film 11 completely coated with ITO was cut into a predetermined size, and then fixed to a stainless steel frame of 1 m 1 + thickness with adhesive and attached to the substrate.

Next, in order to perform the necessary patterning of ITO, photoresist is applied with a roll coater (5) (FIG. 3). The film is suctioned and fixed by a porous body (4) formed on a table (3) connected to the vacuum system, so it does not move during roll two, allowing stable resist application. .

After the resist is applied and dried, the ITO is etched in a hydrochloric acid solution or hydrochloric acid/ferric chloride so that a predetermined ITO pattern can be obtained after exposure and removal, and then the resist is removed. When a film substrate is processed in a liquid, such as in an etching bath or a resist removal process, the process is as shown in FIG.

It is efficient to store a large number of frames-fixed films (7) in the carrier (6) and handle them at the same time. At this time, in order to treat the entire carrier uniformly, it is preferable to circulate the liquid or move the entire carrier in the liquid.
Even with these operations, since the film is fixed to a rigid and appropriately weighted frame, the film will not warp or come into contact with the frame or other films, causing damage, and the entire board will not be damaged. It was in good condition without any floating.

In subsequent processes such as applying an alignment film, rubbing alignment treatment, and printing a sealant, the film can be fixed by suction and handled in the same way as in the resist removal process, and cleaning processes can also be carried out using the carrier. I found out that it can be done easily using this method.

After forming the liquid crystal cell in this way, the film can be separated from the frame and the film or adhesive attached to the frame can be removed mechanically or with a solvent, making it easy to recycle or reuse the frame. (Can be done.

As explained above, even if the present invention uses a film, it has the same rigidity as a glass substrate as a whole, so it is suitable for manufacturing processes that handle conventional glass substrates, and can easily be used with plastic films. It has great industrial utility value because it enables the production of cells for liquid crystal devices as substrates.The film used in the present invention is made of polyester, polysalone, urethane, polycarbonate, polyether sulfone, etc. , 1~lyacetyl cellulose, etc.
Any film may be used.

The adhesive that fixes the film to the frame is thermosetting.

UV curing type, moisture reaction type, hot melt type, etc.
Any method may be used, and if a mechanical fixing means is used to properly fix the film, a frame-shaped fixing frame, screws,
Known fixing means such as clips can be used.

Generally, metals such as stainless steel are suitable as the material for the frame of the present invention, but other materials such as ceramics can also be used as long as they have mechanical strength.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the fixed frame of the present invention. FIG. 2 is a sectional view of the film fixed to the fixed frame. FIG. 3 and FIG. 4 are explanatory diagrams of various steps according to the manufacturing method of the present invention. ■...Frame, 2...Film. 3... fixed stand for adsorption, 4... porous body. 5... Roll coater 26... Carrier. 7.°...Film grass glued and fixed to the frame/)￥I Budz)′A

Claims (1)

[Claims] (1) In the method of manufacturing liquid crystal display cells by laminating plastic films coated with electrically conductive films as substrates with a peripheral sealant in between, the film is fixed to a frame-like frame and handled. Features: A manufacturing method for liquid crystal display cells.