Apparatus for eliminating moire pattern effects resulting from t

Details Apparatus for eliminating moire pattern effects resulting from t Apparatus for eliminating moire pattern effects resulting from t

1993-02-24

1995-07-04

Kostak, Victor R.

Television

Video display

Cathode-ray tube

348524, 348615, 315370, H04N 521, H04N 316

Patent

active

054305020

ABSTRACT:
In a vertical deflection circuit of a display monitor including a vertical deflection coil 41 and a sigmoid correction capacitor 42 connected to the vertical deflection coil 41, a series connection circuit consisting of a resistor 21 and a switch 22 connected in series with each other is connected in parallel with the sigmoid correction capacitor 42. By turning the switch 22 on and off in response to a control signal having a period twice as long as a period of the vertical synchronizing signal, a current flowing through the resistor 21 and the switch 22 is periodically added to a vertical deflection current, thereby causing shift of displaying points on a screen to make the moire phenomenon unnoticeable.

REFERENCES:
patent: 4499457 (1985-02-01), Hintze
patent: 4533855 (1985-08-01), Willis et al.
patent: 4859915 (1989-08-01), Decraemer
patent: 4887010 (1989-12-01), Fujimura
patent: 5107188 (1992-04-01), Rindal

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