Plural filter system cooperating with cathode ray display with l

Details Plural filter system cooperating with cathode ray display with l Plural filter system cooperating with cathode ray display with l

1975-02-03

1976-03-23

Segal, Robert

Electric lamp and discharge devices

Cathode ray tube

Screen

313474, 178 786, H01J 2920, H01J 3120

Patent

active

039462676

ABSTRACT:
An optical filter system is provided for use with a penetration phosphor cathode ray tube of the special kind in which La.sub.2 O.sub.2 S particles are employed as the carrier hosts in the cathodo-luminescent penetration phosphor composition. Tb and Eu ions are used in low concentrations as activators in the control of red and green optical line emission from within a film of the activated host phosphor material. The filter system, bonded to the face plate of the cathode ray tube, provides contrast enhancement with respect to ambient light reflected from that face plate, greatly increasing the equivalent brightness of the color display.

REFERENCES:
patent: 3454715 (1969-07-01), Larach et al.
patent: 3638060 (1972-01-01), Wacher
patent: 3875449 (1975-04-01), Byler et al.
patent: 3886394 (1975-05-01), Lipp

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