CRT spot killer circuit responsive to loss of vertical synchroni

Details CRT spot killer circuit responsive to loss of vertical synchroni CRT spot killer circuit responsive to loss of vertical synchroni

1995-10-31

1998-02-03

Pascal, Robert

Electric lamp and discharge devices: systems

Cathode ray tube circuits

315 85, 348378, H01J 2998

Patent

active

057148430

ABSTRACT:
An improved spot elimination circuit for a monitor capable of Display Power Management Signaling function prevents an occurrence of a focused beam spot from the phosphor screen of a cathode ray tube in the monitor by suddenly dropping the potential level of a high voltage. The circuit includes a high voltage generator, a X-ray sensor, a X-ray protector, a controller and a spot killer circuit. The spot killer circuit actuates the X-ray protector to virtually instantaneously shut down a high voltage generated from the high voltage generator in response to a logic signal indicative of absence of a vertical synchronizing signal. The controller determines the vertical sync signal and generates the logic signal. Accordingly, the phosphor screen of the cathode ray tube is protected from excessive cathode luminance at a focused spot which can cause degradation of the screen.

REFERENCES:
patent: 5430596 (1995-07-01), Hamaguchi et al.
patent: 5483464 (1996-01-01), Song
patent: 5491794 (1996-02-01), Wu

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