High-luminance color screen for cathode-ray tubes and the method

Details High-luminance color screen for cathode-ray tubes and the method High-luminance color screen for cathode-ray tubes and the method

1978-11-09

1980-12-30

Hoffman, James R.

Coating processes

Electrical product produced

Fluorescent or phosphorescent base coating

427 72, 427 73, B05D 136, B05D 302, H01J 2918

Patent

active

042423716

ABSTRACT:
The screen comprises superimposed layers of phosphor crystals having fluorescences of different colors separated by an inert layer having a substantially uniform thickness. In one example, the layers are of green phosphor P1 (J.E.D.E.C.) (.lambda.=550 nm) and red phosphor yttrium vanadate activated with europium (.lambda.=610 nm), in a proportion of 3 to 4 mg/cm.sup.2 and 0.15 mg/cm.sup.2 respectively. The inert layer is silicon sesquioxide (Si.sub.2 O.sub.3), and has a thickness of 1.2 .mu.m. High luminances are obtained throughout the range of colors, for operating voltages ranging between 10 kV and 17 kV.

REFERENCES:
patent: 3204143 (1965-08-01), Pritchard
patent: 3225238 (1965-12-01), Feldman
patent: 3231775 (1966-01-01), Pritchard
patent: 3517243 (1970-06-01), Jones
patent: 3603792 (1971-09-01), Gallaro et al.
patent: 3714490 (1973-01-01), Kell
patent: 3904502 (1975-09-01), Phillips

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