Brightness modulator for closed loop compensation of black...

H - Electricity – 04 – N

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350/83

H04N 5/57 (2006.01) H04N 5/45 (2006.01)

Patent

CA 2013344

A contrast control circuit develops a video gain control signal for continuously varying the video gain of a video signal to adjust the contrast of the video signal and limit beam current. The contrast control circuit may comprise an auto contrast control responsive to video signal peaks, a contrast limiter responsive to a beam current control signal related to average picture intensity and a manual control. A brightness modulator is also responsive to the contrast control signal for continuously adjusting the brightness of the video signal inversely with the contrast. The brightness modulation is especially useful as part of a pix-in-pix video control circuit, further comprising video sources for first and second video signals and a selector for alternatively feeding the first and second video signals to a video amplifier to form a primary picture with an inset secondary picture.

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