CRT Control circuit
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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Abstract
A circuit for controlling a CRT including a control which monitors tube parameters and adjusts the nominal cut-off level of the tube cathode current accordingly, sensing when the control is near an extreme of its range of adjustment and responsive to the sensing to change 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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Citations
7 Claims
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1. A circuit for controlling a cathode ray tube comprising:
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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. - View Dependent Claims (2, 3, 4, 5)
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6. A circuit according to 1 claim wherein the changing means is so arranged as to bring the nominal cutoff level control loop to substantially an extreme of its range of adjustment.
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7. An integrated circuit for controlling a cathode ray tube comprising:
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a 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 said cut-off level control loop is near an extreme of its range of adjustment; and means responsive to said sensing means for changing a control signal applied to a grid of the tube so as to bring said cut-off level control loop within its range of adjustment.
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Specification