Circuit for controlling a horizontal focus signal in a monitor

Details Circuit for controlling a horizontal focus signal in a monitor Circuit for controlling a horizontal focus signal in a monitor

1997-12-09

1999-11-02

Westin, Edward P.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

31536821, 31536822, 3153821, H01J 2958

Patent

active

059777281

ABSTRACT:
A circuit for controlling a horizontal focus signal improves picture quality, which has horizontal and vertical focus signal generating sections for generating parabola-shaped horizontal and vertical focus signals according to horizontal and vertical deflection signals, a high voltage generating section for receiving the dynamic focus signal, a DC power supply controlling section for detecting voltage supplied from an auxiliary coil of said high voltage generating means, and for generating a PWM signal to generate a DC power supply corresponding to a mode according to a voltage detected by an auxiliary coil of the high voltage generating section, a DC voltage varying section for generating a DC voltage corresponding to the mode according to the PWM signal, and a horizontal focus signal amplifying section for amplifying the horizontal focus signal according to the DC voltage of the DC voltage varying section to supply the amplified horizontal focus signal to a mixing section. The horizontal focus signals are amplified according to the DC voltage varied by the frequency of the horizontal sync signal for finely controlling the horizontal focus signal when finely varying the horizontal sync signal, to thus improve the resolution of a monitor.

REFERENCES:
patent: 5245254 (1993-09-01), Lee
patent: 5442263 (1995-08-01), Alig
patent: 5615092 (1997-03-01), Helfrich
patent: 5705900 (1998-01-01), Hwang
JAPIO Abstract Accession No. 02850368 & JP 010147968 A (Mitsubishi) Jun. 9, 1989.

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