Upper and lower distortion correcting circuit by modes

Details Upper and lower distortion correcting circuit by modes Upper and lower distortion correcting circuit by modes

1997-12-04

2000-01-04

Westin, Edward P.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315370, H01J 2956

Patent

active

060113642

ABSTRACT:
An upper and lower distortion correcting circuit by modes in a display device which displays a video signal as a visible image, includes: a parabolic generator for receiving a vertical pulse to generate a parabolic wave in accordance with the received vertical pulse; a multivibrator for s receiving a horizontal pulse outputted from a microcomputer and for triggering the horizontal pulse in accordance with a horizontal balance signal outputted from a digital to analog converter to adjust and output a triggered horizontal pulse having a controlled duty cycle; a multiplier for multiplying the horizontal pulse outputted from the multivibrator and the parabolic wave outputted from the parabolic generator to thereby output a correction current; a buffer for stabilizing and outputting a gain of the correction current outputted from the multiplier; an amplifying portion for receiving and amplifying the gain of the correction current outputted from the buffer; and a modulation portion for receiving the correction current outputted from the amplifying portion and the vertical pulse and for superimposing the correction current and the vertical pulse to generate a combined correction wave.

REFERENCES:
patent: 4668897 (1987-05-01), Haferi
patent: 4748384 (1988-05-01), Oliver
patent: 4764709 (1988-08-01), Oliver
patent: 4777411 (1988-10-01), O'Conner et al.
patent: 4845409 (1989-07-01), Oliver
patent: 5449982 (1995-09-01), Ando
patent: 5583400 (1996-12-01), Hulshof et al.
patent: 5780978 (1998-07-01), Bang

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