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Apparatus-and-method-of-anode-power-supply-control-during-vertical-retrace

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Apparatus and method of anode power supply control during vertical retrace

Details

Inventors: Blanc, James J.; Hansen, Bryan P.; Kemper, Dale A.;
Assignee: Sperry Corporation (New York, NY)
Primary Examiner: Blum; Theodore M.
Assistant Examiner: Issing; Gregory C.
Attorney, Agent or Firm: Terry; Howard P.

Apparatus and method for control of an anode voltage power supply for reduction of fluctuation in anode power supply output during the vertical retrace period, resulting in improvements in overall CRT display performance parameters.

DETAILED DESCRIPTION The present invention provides an apparatus and method for controlling anode power supply output voltage fluctuation during the vertical retrace period by providing a control stage which generates a pulse in response to a signal derived from the CRT video input signal.
The pulse is used to turn off the anode voltage power supply during the no-load vertical retrace period.
Measurable improvements in CRT display performance are achieved in the form of reduced spot size growth, better uniformity of resolution over the entire screen and reduced dimensional stability errors.

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