Color picture tube

Details Color picture tube Color picture tube

1975-03-26

1976-11-02

Segal, Robert

Electric lamp and discharge devices

Cathode ray tube

Screen

313473, H01J 2920, H01J 2910

Patent

active

039899772

ABSTRACT:
In a color picture tube having a phosphor screen with three kinds, i.e., red, blue and green phosphor dots or phosphor strips, the red phosphor dots or strips are formed by employing europium-activated yttrium oxide (Y.sub.2 O.sub.3 :Eu) phosphor powder, each particle of which powder is coated with thin layer of europium-activated oxysulfide (Y.sub.2 O.sub.2 S:Eu) phosphor. By means of such thin coating of the oxysulfide phosphor, the conventional adverse active characteristic of Y.sub.2 O.sub.3 :Eu against photo-hardening agent in the phosphor slurry used in forming phosphor screen is eliminated, thereby increasing the uniformity of the red light emission and decreasing the U-V light exposure time in the screen forming process.

REFERENCES:
patent: 3791844 (1974-02-01), Tecotzky et al.
patent: 3875449 (1975-04-01), Byler et al.

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