Horizontal focus controlling apparatus for cathode-ray tube

Details Horizontal focus controlling apparatus for cathode-ray tube Horizontal focus controlling apparatus for cathode-ray tube

1997-09-24

2000-11-21

Lee, Michael H.

Television

Video display

Cathode-ray tube

31536821, H04N 322, H04N 928

Patent

active

061510823

ABSTRACT:
The present invention relates to a horizontal focus controlling apparatus which compensates for a distortion generated on a screen of a computer or a TV set. The apparatus includes select signal generating means for dividing the period of a sawtooth signal into a falling portion, a rising portion located before the central point of the positive pulse of a flyback pulse signal, and a rising portion after the central point of the positive pulse of the flyback pulse signal and generating first, second, and third select signals synchronized with the respective portions and parabola signal generating means for generating a parabola signal which is synchronized with the flyback pulse signal by controlling the sawtooth signal according to the selections of the first, second, or third select signals.

REFERENCES:
patent: 5436677 (1995-07-01), Suzuki et al.
patent: 5596248 (1997-01-01), Hosoi et al.
patent: 5831400 (1998-11-01), Kim
patent: 5923387 (1999-07-01), Van Der Sanden

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