Color picture tube with light absorbing layer on screen

Details Color picture tube with light absorbing layer on screen Color picture tube with light absorbing layer on screen

1992-02-13

1992-09-15

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Screen

313474, 313472, H01J 2930, H01J 2932

Patent

active

051480824

ABSTRACT:
A color picture tube comprising an envelope including a front panel, a phosphor screen formed in the inner surface of the front panel, and an electron gun arranged in the envelope. The phosphor screen includes a light absorbing layer having a plurality of holes and phosphor layers formed in the holes so as to partially overlap the light absorbing layer. The transmittance T of the light absorbing layer, the ratio a of the area of a light emitting region in a portion where the light absorbing layer overlaps the phosphor layers to the area of the phosphor screen, the ratio b of the area of the light absorbing layer to the area of the phosphor screen, and the ratio r of the light emitting region in the holes to the area of the holes satisfy the following relational expression: 1/T.gtoreq.1/2{(rb/a)-[a/(1-b)r]}.

REFERENCES:
patent: 3614503 (1971-10-01), Dietch
patent: 3614504 (1971-10-01), Kaplan
patent: 3661580 (1972-05-01), Mayaud
patent: 3863086 (1975-01-01), Speigel

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