Cathode ray tube display horizontal deflection system with delay

Details Cathode ray tube display horizontal deflection system with delay Cathode ray tube display horizontal deflection system with delay

1983-01-26

1985-10-15

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315387, H01J 2970, H01J 2976

Patent

active

045477108

ABSTRACT:
The initiation of the flyback interval of a variable format CRT display system is controlled by a frequency independent closed loop compensation circuit. The termination point of a sawtooth pulse, which is initiated at the start of the horizontal sync for the CRT display system, determines the point for the initiation of the flyback interval. The termination point of the sawtooth is compared with the center of the flyback interval. So long as the flyback pulse is perfectly centered on the termination point, the timing is proper. However, if it is off-centered, circuitry results in delaying or advancing the turning off of the horizontal yoke driver to modify the initiation of the flyback interval in a manner to compensate for the change in delay.

REFERENCES:
patent: 3970894 (1976-07-01), Yasuda et al.
patent: 4292654 (1981-09-01), Steckler et al.
patent: 4400652 (1983-08-01), Sunderland
patent: 4400653 (1983-08-01), Olmstead

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