Cathode ray tube drive circuitry

Details Cathode ray tube drive circuitry Cathode ray tube drive circuitry

1981-07-31

1984-07-31

Wilbur, Maynard R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315367, H01J 2956

Patent

active

044632886

ABSTRACT:
Cathode ray tube drive circuitry in which non-linearity of the line scan is corrected by varying the frequency of the pel clock oscillator in accordance with anticipated variations in scanning speed. Predetermined speed corrections are stored in a digital store 23 and, by means of digital to analog converter 24 and integrator 25, are applied to the control input of a voltage controlled oscillator 13. Synchronization of the pel clock with the X-deflection waveform is effected by means of a parallel phase-locked loop comprising counter 15, sample and hold 18, amplifier 20 and low pass filter 21. Preferably a sinusoidal waveform is applied to the X-deflection coil in such a manner as to have a bidirectional raster scan, the X-deflection coil forming part of a tuned circuit of the sinusoidal waveform generator.

REFERENCES:
patent: 3809947 (1974-05-01), Ambrico et al.
patent: 4305022 (1981-12-01), Mitamura et al.
"Bidirectional Scan for CRT", A. S. Murphy IBM Tech. Disclosure Bull., vol. 21, No. 12 (May 1979).

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