Circuit for regulating a horizontal size and a vertical size of

Details Circuit for regulating a horizontal size and a vertical size of Circuit for regulating a horizontal size and a vertical size of

1996-11-29

1999-04-27

Chin, Tommy P.

Television

Video display

Cathode-ray tube

348807, 315371, 315373, H04N 718, H01J 2956

Patent

active

058984674

ABSTRACT:
A frame size regulating circuit provides high picture quality to a viewer by regulating a frame width according to a picture brightness signal and pulsewidth modulation signals. The circuit includes a microprocessor for generating pulsewidth modulation signals for respectively regulating horizontal and vertical sizes of the frame according to horizontal and vertical sync signals from the external, and a horizontal-size control signal generator part for generating a horizontal size control signal for regulating the horizontal size according to the first pulsewidth modulation signal of the microprocessor and a picture brightness signal from a flyback transformer. A horizontal size control part overlaps the horizontal size control signal with a distortion correction signal, and a vertical-size control signal generator part generates a vertical size control signal for regulating the vertical size according to the picture brightness signal and the second pulsewidth modulation signal of the microprocessor to provide the vertical size control signal to a deflection circuit. The frame size is regulated according to the picture brightness signal and high voltage fluctuation to improve picture quality.

REFERENCES:
patent: 4318036 (1982-03-01), Bart et al.
patent: 4501996 (1985-02-01), Yamaguchi
patent: 4916365 (1990-04-01), Arai
patent: 5034667 (1991-07-01), Lendaro
patent: 5113122 (1992-05-01), Bando et al.
patent: 5448140 (1995-09-01), Douken et al.
patent: 5508593 (1996-04-01), George
patent: 5596248 (1997-01-01), Hosoi et al.
patent: 5686800 (1997-11-01), Kim
patent: 5698953 (1997-12-01), Shim

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