Cathode ray tube phosphor protection circuit

Details Cathode ray tube phosphor protection circuit Cathode ray tube phosphor protection circuit

H - Electricity

01

J

355/14

H01J 29/72 (2006.01) H04N 3/20 (2006.01)

Patent

CA 1041219

ABSTRACT OF THE DISCLOSURE The phosphor screen or a cathode ray tube (CRT) has its phosphor coating protected against damage caused by a sta- tionary or low sweep velocity electron beam that strikes its surface, by removal of the video signal that controls the beam whenever there is a simultaneous presence of video signal and absence of a proper horizontal or vertical sweep signal.

233833

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