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CRT Control circuit

  • US 4,724,364 A
  • Filed: 02/06/1986
  • Issued: 02/09/1988
  • Est. Priority Date: 06/06/1984
  • Status: Expired due to Fees
First Claim
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1. A circuit for controlling a cathode ray tube comprising:

  • a nominal cut-off control loop for operatively monitoring tube parameters and adjusting the nominal cut-off level of the tube cathode current accordingly within a predetermined range of adjustment;

    means for sensing when the nominal cut-off level control loop is near an extreme of its range of adjustment; and

    means responsive to the sensing means for changing a control signal applied to a grid of the tube so as to bring the nominal cut-off level control loop within its range of adjustment.

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