Cathode ray tube phosphor protection circuit

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

1974-12-23

1976-06-15

Wilbur, Maynard R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315384, H01J 2952

Patent

active

039639614

ABSTRACT:
The phosphor screen of a cathode ray tube (CRT) has its phosphor coating protected against damage caused by a stationary 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.

REFERENCES:
patent: 3437872 (1969-04-01), Henderson et al.
patent: 3810024 (1974-05-01), Meacham
patent: 3811068 (1974-05-01), Curry, Jr.

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