Circuit for controlling the picture tube in a television receive

Details Circuit for controlling the picture tube in a television receive Circuit for controlling the picture tube in a television receive

1997-11-18

2000-05-02

Harvey, David E.

Television

Cathode-ray tube display excessive voltage control

348809, H04N 916

Patent

active

060578831

ABSTRACT:
A circuit for controlling the picture tube in a television receiver. In order to generate a high peak white on the screen of the picture tube, it is desirable to drive the output amplifiers at full output. Because of tolerances, for example in the cutoff calibration, the transparency of the picture tube glass, fluctuations in the input signal etc., driving the video output stages to full output may drive the output stages into saturation and disturbances in the form of so-called smears can occur in the picture. The present invention permits the output stages to be driven to full output as far as the highest peak white without the output amplifiers going into saturation and causing disturbances in the form of smears in the picture. In particular, the outputs of the output amplifiers are each connected via a diode to a common circuit point with a voltage such that the amplitudes of the output voltages of the output amplifiers do not exceed, in the direction of white, a prescribed value corresponding to peak white. In a development, the circuit point is connected to a control terminal, serving to limit the beam current, of a video processor supplying the color signals.

REFERENCES:
patent: 4704631 (1987-11-01), Bell
Giorgio Betti and Silvan Coccetti; Integrated Video Output Stages for Direct Driving of Color Tube Cathodes; 137-145.

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