Cathode-ray tube including a white phosphor screen

Details Cathode-ray tube including a white phosphor screen Cathode-ray tube including a white phosphor screen

1987-07-02

1989-02-14

Boudreau, Leo H.

Electric lamp and discharge devices

Cathode ray tube

Screen

313467, 2523016S, 2523014S, H01J 2920, C09K 11477

Patent

active

048048828

ABSTRACT:
A cathode-ray tube according to the present invention is provided with a phosphor screen comprising phosphors A, B, and C, wherein each of the phosphors A and B constitute 5 to 15% by weight and, the phosphor C constitutes 70 to 90% by weight. The phosphor A is a bluish white-emitting phosphor (Y.sub.1-x-y Gd.sub.x Tb.sub.y).sub.2 O.sub.2 S (0.ltoreq.X.ltoreq.0.999999 and 0.000001.ltoreq.Y.ltoreq.0.001), the phosphor B is at least one of a blue-emitting silver-activated hexagonal zinc sulfate (ZnS:Ag) phosphor, etc., and the phosphors C is a yellow-emitting phosphor (In.sub.1-p-r M.sub.p TB.sub.q Eu.sub.r BO.sub.3) (wherein M is at least one element selected from the group consisting of Sc, Lu, Y, Gd, and Ga, and p, q, and r satisfy 0.ltoreq.p.ltoreq.0.2, 0.0005.ltoreq.q.ltoreq.0.05, and 0.001.ltoreq.r.ltoreq.0.1). The cathode-ray tube of the present invention is a phosphor screen which is free from toxicity and has good flickering and brightness characteristics and high current dependence of brightness.

REFERENCES:
patent: 3394084 (1968-07-01), Avella
patent: 4512912 (1985-04-01), Matsuda et al.
patent: 4631445 (1986-12-01), Hase et al.
patent: 4694217 (1987-09-01), Morita

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