Circuit for compensating deflection in a display unit without pi

Details Circuit for compensating deflection in a display unit without pi Circuit for compensating deflection in a display unit without pi

1998-06-02

2000-09-12

Ham, Seungsook

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315399, 315370, 315369, G09G 104, H01J 2956, H01J 2970

Patent

active

06118232&

ABSTRACT:
A compensating circuit is for compensating distortion of a picture which is displayed on a display unit having a yoke. The compensating circuit controls a yoke current to compensate a picture distortion. The compensating circuit comprises a first generating section for generating a digital deflecting compensation signal in accordance with deflecting compensation data representative of compensation value of the picture. A second generating section generating a variable voltage (+B voltage) in accordance with a PWM pulse signal to control the yoke current on the basis of the variable voltage. A peak holding circuit holds a peak voltage of a flyback pulse based on the variable voltage to produce a peak voltage signal representative of the peak voltage. An A/D converter circuit converts the peak voltage signal into a digital peak signal. A PWM section produces the above-mentioned PWN pulse signal in accordance with the digital deflecting compensation signal and the digital peak signal.

REFERENCES:
patent: 4970442 (1990-11-01), Harada
patent: 5021719 (1991-06-01), Arai et al.
patent: 5283505 (1994-02-01), Bando
patent: 5656894 (1997-08-01), Murakami et al.
patent: 5831398 (1998-11-01), Kim
patent: 5949400 (1999-09-01), Kim

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