Cathode ray tube with pigment-doped phosphor

Details Cathode ray tube with pigment-doped phosphor Cathode ray tube with pigment-doped phosphor

1986-10-21

1988-09-20

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Screen

2523016F, 25230165, 2523014F, 313468, H01J 2920

Patent

active

047728183

ABSTRACT:
In a cathode ray tube with a phosphor screen containing a Zn type green emitting phosphor, e.g. ZnS, ZnCdS and Zn.sub.2 SiO.sub.4, the surface of the phosphor particle includes a surface area of (Co,Zn)O. The surface area is green colored to operate as a filter against incident light from outside the tube and reduces background brightness of picture images caused by excitation of scattering electrons. Thus, the contrast of the picture images rises. The contrast is further increased by Ni doped.

REFERENCES:
patent: 4116864 (1978-09-01), Kagami et al.
patent: 4172920 (1979-10-01), Kanda et al.
patent: 4510414 (1985-04-01), Fujino et al.
patent: 4559469 (1985-12-01), Welker et al.
European Search Report-EP 86 30 8123.

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