JPH024227A - Liquid crystal display cell and its manufacturing method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid crystal display cell used in a display device for in-vehicle equipment, information/OA related equipment, etc., and a method for manufacturing the same.

[Conventional technology]

A liquid crystal display cell is made by placing a pair of transparent substrates on which transparent electrodes in a desired pattern are formed facing each other at a minute distance, sealing the peripheries of these two substrates to form an empty cell, and then filling the inside with liquid crystal material. The encapsulated structure is the basic structure.

For example, as shown in FIG. 2, a solvent containing glass fibers is sprayed onto the electrode forming surface of one of the substrates 21 and dried, thereby dispersing the glass fibers on the surface of the substrate 21 to form a gap control agent 22.
A sealant 23 is applied to the peripheral edge of the substrate, and the other substrate 24 is stacked and pressed to form an empty cell with a predetermined gap, thereby obtaining a liquid crystal layer of a predetermined thickness.

[Problem to be solved by the invention]

However, even if it is attempted to form a predetermined gap by dispersing the gap control agent 22 on the substrate surface in this manner, the gap control agent 22 is not uniformly dispersed and differences in the gap occur. Furthermore, because of the pressure bonding, the gap control agent 22 digs into the electrodes and alignment film, causing display defects. In particular, with color filters formed on the substrate,
A defect occurs in the color filter, causing display unevenness.

An object of the present invention is to provide a liquid crystal display cell having a liquid crystal layer with a uniform and accurate thickness, and to provide a method for manufacturing a liquid crystal display cell that has high gap control accuracy and can contribute to improving yield. There is a particular thing.

[Means to solve the problem]

In the present invention, a pair of LCD substrates in which a desired pattern of transparent electrodes and alignment films are formed on glass substrates are placed facing each other at a predetermined minute interval, the peripheral edges are sealed to form an empty cell, and a liquid crystal is sealed inside. In the liquid crystal display cell, the pair of LC
This is characterized in that a large number of plasma polymerized films having a desired shape are formed on one of the D substrates for gap control so as to be located outside the display area.

It is effective to use a silicone monomer in the plasma polymerized membrane.

Further, the present invention is characterized in that a polymer film is formed on an LCD substrate using a mask using a plasma polymerization method using a silicone monomer as a material, and this film is used to control the gap of a liquid crystal display cell.

〔Example〕

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

As shown in Figure 1, a desired electrode pattern is formed on a glass substrate using a transparent electrode material, and then an alignment film is formed on the L.
A CD substrate 1.2 is used, and a large number of disc-shaped films 3 are formed on the surface of one of them, for example, the substrate 1, by plasma polymerization using silicone monomer as a material. In this case, a mask is used to position the film 3 in areas other than the display area (electrode pattern area). The thickness of the mask is the same as the dimension of the gap to be controlled, typically 5-10 μm. Further, the diameter of the hole for film formation is 10 to 20 μm.

After the film 3 is formed, an adhesive (sealing agent) 4 is applied to the peripheral edge of the substrates, and both LCD substrates 1.2 are overlapped and sealed while uniformly applying pressure. That is, create an empty cell. Liquid crystal 5 is injected into this interior, and the injection port is sealed. This completes the liquid crystal display cell.

Next, the formation of the gap control film 3 will be explained in detail.

Silicone monomers include vinyltrimethoxysilane, hexamethyldisiloxane, methylsilane and oxygen,
etc. is desirable.

Plasma polymerization conditions were vacuum degree 10~i oopa, RF
The power is 50 to 100 W, and the substrate is used as a cathode.

Further, the mask is preferably made of stainless steel, titanium, or tungsten, and its thickness is the same as the dimension of the gap to be controlled as described above.

When plasma polymerization is performed using the above materials and masks under the above plasma polymerization conditions, a polymer film is formed without affecting the display at all. This film has a dense three-dimensional cross-link structure, is transparent, hard, and has excellent heat resistance and chemical resistance, making it ideal for gap control.

〔Effect of the invention〕

(1) Since the accuracy of gap control depends on the film thickness of the plasma polymerized film, accuracy of about 0.1 μm is possible, resulting in high accuracy.

(2) A film having a desired shape for gap control can be reliably positioned outside the display area, and the silicone-based plasma polymerized film does not react with liquid crystals and is colorless and transparent. As a result, the display becomes clearer.

(3) Since gap control is performed using a plasma polymerized film, sufficient gap accuracy can be obtained with small pressure, preventing damage to electrodes, alignment films, and color filters, and improving yield.

(4) Plasma polymerization is a low-mixing film method, and the formed film has a dense three-dimensional cross-linked structure, is transparent and hard, and has excellent heat resistance and chemical resistance, making it an optimal gap control film. can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a liquid crystal display cell and its manufacturing method according to the present invention, and FIG. 2 is a sectional view showing the structure of a conventional empty cell. 1.2... LCD substrate, 3... plasma polymerized film for gap control, 4...
...Adhesive, 5...Liquid crystal. Patent applicant Stanley Electric Co., Ltd. Figure 1 Figure 2

Claims (2)

[Claims] (1) A pair of LCD substrates each having a desired pattern of transparent electrodes and an alignment film formed on the glass substrates were placed facing each other at a predetermined minute interval, and the periphery was sealed to form an empty cell, with liquid crystal sealed inside. A liquid crystal display cell, characterized in that a large number of plasma polymerized films having a desired shape are formed on one of the pair of LCD substrates for gap control so as to be located outside the display area. (2) Apply a sealant to the periphery of the LCD substrate, overlap them, apply pressure and adhere while controlling the gap to form an empty cell. After this, liquid crystal is injected inside and the injection port is closed. In a method for manufacturing a liquid crystal display cell to be sealed,
Using silicone monomer and plasma polymerization method, L
A method for manufacturing a liquid crystal display cell, which comprises forming a polymer film having a pattern and thickness defined by a mask on a CD substrate.