Spot elimination circuit for a cathode ray tube

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

1995-09-29

1997-10-14

Kostak, Victor R.

Television

Cathode-ray tube burn-in prevention

348377, 315381, H04N 320

Patent

active

056777302

ABSTRACT:
An improved spot elimination circuit for preventing a spot from occurring on the screen of a cathode ray tube such as a monitor or television receiver at the instant that the deflection circuit is shut off. An input voltage is charged and discharged to supply a high voltage in negative polarity to a first grid of the cathode ray tube. The spot elimination circuit includes a flyback transformer having a separate turns portion additionally provided for generating a high voltage and utilizes the high voltage as an input to thereby supply a cut-off voltage to the first grid. 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: 3535445 (1970-10-01), Griffey
patent: 4340910 (1982-07-01), Valdes
patent: 5036257 (1991-07-01), Norman et al.
patent: 5084657 (1992-01-01), Ueda
patent: 5184225 (1993-02-01), Heidebroek et al.

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