Image display panel having antistatic film with transparent and electroconductive properties and process for processing same

Abstract

There are disclosed an image display panel having an antistatic film comprising a SiO2 coat of transparent and electroconductive properties on the front surface of said panel; the coat containing fine particles of at least one compound selected from electroconductive metal oxides and hygroscopic metal salts; and a process for producing the same.

Description

BACKGROUND OF THE INVENTION1. Field of the InventionThe present invention relates to image display panels and a process for producing the same, and more particularly, to image display panels, especially screen panels of cathode ray tubes, the front surfaces of which are improved in antistatic properties and if necessary, coated with films best suited for minimizing the reflection of external light, and to a process for producing such panels.2. Description of Related ArtTransparent base plates made of glass or the like are used for image display panels, as represented by those of cathode ray tubes and liquid crystal display devices. It is desired to inhibit these image display panels from electrification, i.e. being charged with electricity, and from the reflection of external light.As regards the inhibition of electrification, the wide use of explosion-proof cathode ray tubes in recent years has brought about the uselessness of the front protecting glasses of television receivers or...

AI Technical Summary

Benefits of technology

An object of the invention is to provide image display panels superior in antistatic function.

Another object of the invention is to provide a process for producing image display panels superior in antistatic function.

A further object of the invention is to provide image display panels superior in both antistatic and reflection inhibiting functions.

Problems solved by technology

As regards the inhibition of electrification, the wide use of explosion-proof cathode ray tubes in recent years has brought about the uselessness of the front protecting glasses of television receivers or of other display devices and, in consequence, the front parts of cathode ray tubes have become bare.

This has caused matters such that a person upon directly touching the front part (panel) of a cathode ray tube, is strongly shocked by high voltage electrostatic charge present on the panel surface.

Moreover, the electrified panel surface absorbs atmospheric dirt or dust, which accumulates and fouls the panel surface.

This raises the problem of images formed on the panel being hard to see.

In addition, the outer surfaces of the panels (image display panels) of Braun tubes are glassy and hence are liable to strongly reflect external light, making it difficult to read images formed on the panels.

In addition, the film fixing temperature cannot be raised over 80.degree. C. because some silanol groups (--Si--OH) must be left in the film constitution (at higher temperatures all the silanol groups convert to form the Si--O--SiO siloxane structure).

Vapor deposition methods are not fitted for mass production, since they generally require large-scale apparatus for vacuum deposition, sputtering, CVD (chemical vapor deposition), or the like and need treatment in vacuo.

Moreover, these methods involve significant problems in fabrication cost as well as in increase in throughput.

The above-mentioned method of forming transparent conductive films in the form of strips requires more operation steps, requiring high production costs.

The formation of extra fine conductor wires in the form of strips has many problems in production cost and in product performance.

Hence it is difficult to form uniform unevenness throughout the glass surface.

This raises the problem of such panels displaying images of low degrees of resolution.

Therefore the intended antistatic effect cannot be obtained.

According to the method of adhering telepanels provided with AR coats by vapor deposition, excellent reflection inhibiting efficiency can be achieved, but the antistatic effect cannot be obtained since the AR coats consist of an insulator, and in addition the fabrication cost is high.

Images