Horizontal deflection circuit for a monitor

Details Horizontal deflection circuit for a monitor Horizontal deflection circuit for a monitor

1998-05-15

2000-07-18

Ham, Seungsook

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315370, 315403, G09G 104, H01J 2956, H01J 2970

Patent

active

060912138

ABSTRACT:
A horizontal deflection circuit for a monitor is disclosed. The horizontal deflection circuit for a monitor includes a microprocessor for determining a mode of the monitor according to frequencies of the horizontal sync signal Hs and a vertical sync signal Vs such as VGA(video graphic adapter), and SVGA(super VGA) and for generating a control signal to generate a horizontal picture size signal and a distortion correcting signal of parabolic waveform corresponding to the determined mode; a distortion correcting signal generating unit for superimposing the distortion correcting signal and the horizontal picture size signal and for outputting a superimposed signal; a distortion correcting signal control unit for controlling an amplitude of the superimposed signal in accordance with an amplifying signal; a PWM signal generating unit for pulse-width modulating an output signal of the distortion correcting signal control unit and for outputting a PWM signal; a buffer for buffering the PWM signal; and a distortion correcting signal output unit for amplifying the PWM signal in accordance with an externally-supplied voltage source B+ and for supplying the amplifying signal to the horizontal deflection coil.

REFERENCES:
patent: 5349274 (1994-09-01), Watanabe et al.
patent: 5475286 (1995-12-01), Jackson et al.
patent: 5894203 (1999-04-01), Lee

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