White balance circuit in which low light adjustment is not influ

Details White balance circuit in which low light adjustment is not influ White balance circuit in which low light adjustment is not influ

1995-02-28

1997-09-02

Groody, James J.

Television

Image signal processing circuitry specific to television

Color balance or temperature

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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