Spot killer circuit for a cathode ray tube

Details Spot killer circuit for a cathode ray tube Spot killer circuit for a cathode ray tube

1996-06-24

1999-07-06

Peng, John K.

Television

Cathode-ray tube burn-in prevention

315384, 315386, 315387, H04N 320

Patent

active

059203390

ABSTRACT:
A spot killer circuit for a CRT is capable of thoroughly removing any spot persistence and prevents damage to the fluorescent body of the CRT due to inaccurate horizontal and vertical deflection. When the power cord is unplugged, or when the display device is turned off (for example, via remote control key input), the bias voltage of the first grid G1 and the electric potential of the cathode are controlled so as to completely suppress any residual beam current flowing in the CRT. In the case of an inaccuracy (such as total failure) in either the horizontal deflection or the vertical deflection signals, the bias voltage of the first grid and the electric potential of the cathode are controlled to suppress the CRT beam current just as in the case of power shut off. This prevents damage of the fluorescent body in the CRT due to the inaccurate deflection operation.

REFERENCES:
patent: 4056758 (1977-11-01), Schaas
patent: 4390817 (1983-06-01), Johnson
patent: 4488181 (1984-12-01), Haferl
patent: 5089754 (1992-02-01), George

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