White balance circuit in which low light adjustment is not influ

Television – Image signal processing circuitry specific to television – Color balance or temperature

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348655, 348692, H04N 972, H04N 973

Patent

active

056637705

ABSTRACT:
A color picture display apparatus is provided having a driving circuit for a display device so that a low light adjustment is not influenced by a high light adjustment during white balance adjustment. Horizontal blanking period is blanked by a transistor and a clamping potential of a low light level for white balance adjustment is added to the above blanked signal. The signal, to which a clamping potential was added, is gain-adjusted and clamped by a capacitor and a transistor. Next, the clamped portion is blanked at a transistor and the blanked signal is supplied to a CRT through a driving stage. Low light adjustment is done by adjusting clamping potential with a potentiometer and high light adjustment is done by adjusting gain with another potentiometer.

REFERENCES:
patent: 4178558 (1979-12-01), Nagashima et al.
patent: 5107189 (1992-04-01), Page

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