Cathode ray tube display systems

Details Cathode ray tube display systems Cathode ray tube display systems

1984-09-14

1987-07-21

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315366, 315367, 313422, H01J 2956, H01J 2970, H01J 2972

Patent

active

046820868

ABSTRACT:
A CRT display system providing a raster pattern has digital means 30, 31, 32 to drive a DAC 34. In response, there are supplied analogue signals, on a line 37. There are also provided pulse generating means 90 controlled by the digital means, and integrating means comprising two integrators. Each integrator is connected individually to an X deflection plate 14 of the CRT, and comprises an amplifier and a feedback capacitor. One capacitor C2 is charged by negative-going pulses, and the other capacitor C2' is charged by positive-going pulses, until the pulses are removed, when the required ramps are applied to the deflection plates. Then a current flows through a transistor T7, and is controlled by the DAC output on the line 37. Hence, the waveforms applied to the deflection plates cause distortion of the raster pattern otherwise obtained, to be corrected, the DAC output representing a function comprising the inverse of the function representing the distortion.

REFERENCES:
patent: 3437874 (1969-04-01), Cressey et al.
patent: 3718834 (1973-02-01), Bacon et al.
Pearson, "Analog Controlled Constant Velocity Deflection", IBM Tech. Disc. Bull., vol. 9, No. 2, Jul. 1966.

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