Variable format controls CRT raster

Details Variable format controls CRT raster Variable format controls CRT raster

1983-11-28

1986-04-08

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315393, H01J 2970, H01J 2972

Patent

active

045815631

ABSTRACT:
Feedback loops monitor the vertical and horizontal deflection yoke drive voltages of the CRT and separately compare each potential with a voltage which represents full screen deflection. Error voltage resulting from these comparisons adjust the power supplied the yoke to maintain full scale deflection with variations in the frequencies of the vertical sweep or horizontal sync pulses. The feedback loops can be made interdependent so that the smaller one of the two drive potentials determines the size of both drive potentials. In this way the aspect ratio will be maintained irrespective of the changes in the format presented on the screen.

REFERENCES:
patent: 3970894 (1976-07-01), Yasuda et al.
patent: 4002824 (1977-01-01), Petrocelli et al.
patent: 4004190 (1977-01-01), Simpson
patent: 4309640 (1982-01-01), Gordon
patent: 4414494 (1983-11-01), Schmidt

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