JPS5823608B2 - Liquid crystal display panel surface treatment method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid crystal display panel, and more particularly to a method for surface treatment of a substrate constituting the panel. It is characterized by depositing and coloring the substrate by thermal diffusion.

An object of the present invention is to provide color variety to a liquid crystal panel by partially or completely coloring the liquid crystal panel.

Conventionally, electro-optical methods such as the DAP method and guest-host method have been considered for coloring liquid crystals, and optical methods have been considered such as coloring reflectors, filters, polarizing plates, etc.

The DAP method is not suitable for reflective liquid crystal panels, especially for Watch, and the guest-host method has many problems in terms of the light resistance of the dye.

Various attempts have been made to color reflective plates, filters, polarizing plates, etc., but they have not been put to practical use due to lack of optical transparency, inability to color parts of the body with clearance, and layout problems. It was possible.

All of the above problems can be solved by using the coloring of the substrate mentioned in the present invention.

Furthermore, the surface treatment method of the present invention can be applied to liquid crystal panels without changing the conventional panel assembly process or adding much cost.

Examples of the substrate include glasses such as borosilicate glass and soda glass, and transparent plastics such as acrylic and vinyl chloride.

As a deposit on the substrate, Cr I
A n 9 Cu , Co 9 Mn I Fe ,
N t metals or oxides thereof may be used, and these may be used alone or two or more types may be mixed.

Further, an oxidizing agent or a reducing agent may be mixed so as to be ionized and colored in the glass.

Also, partially different items may be deposited within the same panel.

Father, I don't mind having the bottom panel colored differently and using color combinations.

Depositing methods include printing method, C■ method, sputtering method,
Vapor deposition methods can be considered, but the vapor deposition method is superior from the standpoint of clearance.

According to the vapor deposition method, it is possible to create arbitrarily designed patterns and arbitrarily designed color tones using various vapor deposition masks.

Further, a semiconducting metal oxide such as bismuth oxide or lead oxide may be used as a base treatment before depositing.

This improves adhesion. Also, 5i02. is applied to these surfaces after depositing. TiO□.

It may be coated with a glass material such as.

The substrate subjected to these treatments is thermally diffused in H2 gas as a reducing atmosphere, O2air as an oxidizing atmosphere, and N2 or argon gas as a neutral atmosphere.

Further, depending on the case, a vacuum atmosphere may be used.

Alternatively, after the entire surface has been deposited, etching may be performed in a designed pattern and further thermal diffusion may be performed.

Further, it may be used in combination with a color tone of a reflecting plate, filter, polarizing plate, etc.

The following will be explained according to examples. Example 1 Using a mask on the upper half of the top glass of an ordinary digital watch liquid crystal panel glass (Pyrex glass)
Approximately 10 OA of bismuth was vacuum deposited at = mm Hg.

Furthermore, gold was vacuum-deposited on the bismuth under the same conditions at about 10 OA.

Such glass was heat treated in a belt furnace set at a maximum temperature of 560°C.

The treated side of this glass was colored blue.

A pink color was obtained when treated at a higher temperature.

These colored films did not come off even after ordinary ultrasonic cleaning.

When a liquid crystal panel was assembled using such glass, very good color tone was obtained.

Also, no fading occurred in the moisture resistance and light resistance tests.

Example 2 Bismuth was vapor-deposited on the entire surface of the top glass of an ordinary digital watch liquid crystal panel glass (Pyrex) under the same conditions as in Example 1, and then about 10 OA of chromium was vapor-deposited.

Furthermore, when this chromium film was etched into an arbitrary pattern using a photoresist method and heat treated at 560°C using a belt furnace, a very transparent yellow-green color was obtained.

As described above in accordance with the embodiments, the present invention relates to a method for realizing colorization of a liquid crystal panel easily and with variations.

Using this method, it has become possible to create a liquid crystal panel that is extremely transparent and light-resistant.

Claims (1)

[Claims] 1. In a display panel using nematic liquid crystal, Cr is deposited on a transparent substrate constituting the panel. A method for surface treatment of a liquid crystal display panel, characterized in that metals such as Au, Cu, co5Mn, Fe, and Ni or metal oxides thereof are deposited on the entire surface or in part, and a substrate is colored by thermal diffusion.