Protective circuit for the CRT and lens

Details Protective circuit for the CRT and lens Protective circuit for the CRT and lens

1997-04-18

1999-12-28

Kostak, Victor R.

Television

Cathode-ray tube burn-in prevention

348380, 348678, H04N 568

Patent

active

060088427

ABSTRACT:
A protective circuit and a signal processor for a three-CRT projection TV for preventing CRT burnout, deterioration of luminous characteristics, and damage to lenses by heat. Each CRT beam current detection circuit detects the beam current of each CRT. A state of the video image is predicted based on the detected beam current values and their duration. A microcomputer determines a control voltage for controlling the contrast based on the state of the video image, detected values, and their duration. The contrast is thus controlled by a control signal output to a video control circuit which controls the beam current.

REFERENCES:
patent: 4722005 (1988-01-01), Ledenbach
patent: 5200829 (1993-04-01), Lagoni
patent: 5589883 (1996-12-01), Ogino et al.

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