Photoresist for cathode ray tubes

Details Photoresist for cathode ray tubes Photoresist for cathode ray tubes

1995-04-19

1996-07-16

Snow, Walter E.

Electric lamp and discharge devices

Cathode ray tube

Screen

313479, H01J 2910, H01J 3100

Patent

active

055369944

ABSTRACT:
The inner surface of a video display panel such as cathode ray tube (CRT) glass faceplate is initially coated with a mixture of one of the primary color phosphors, an organic binder such as polyvinyl alcohol (PVA) diluted with water, and a photoresist agent. The organic binder overcomes the poor adhesion to the glass faceplate of the photoresist which typically includes polyvinyl pyrrolidone (PVP) and reduces the oxygen which decreases phosphor exposure time. To overcome PVA and PVP incompatibilities which give rise to nonuniform film thickness, a vinyl pyrrolidone-vinyl alcohol (VP-VA) copolymer is added to the phosphor, organic binder and photoresist mixture in the range of 0.1-30 wt %. The copolymer with both the VP and VA functioning groups serves as a coupling agent between the PVA and PVP and eliminates incompatibilities between these components. The VP-VA copolymer preferably has a VP/VA mole ratio in the range of 20/80 to 80/20.

REFERENCES:
patent: 4442196 (1984-04-01), Iwaki et al.
patent: 4491629 (1985-01-01), Koike et al.
patent: 4501806 (1985-02-01), Watanabe et al.
patent: 5041570 (1991-08-01), Tochizawa et al.
patent: 5326675 (1994-07-01), Niki et al.

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