White balance correction circuit of a color image receiving tube

Details White balance correction circuit of a color image receiving tube White balance correction circuit of a color image receiving tube

1994-06-21

1996-06-11

Kostak, Victor R.

Television

Image signal processing circuitry specific to television

Color balance or temperature

348656, 348675, H04N 973, H04N 969

Patent

active

055260594

ABSTRACT:
A white balance correction circuit corrects the signal level of red and blue video signals. The circuit includes both active elements and passive elements which cooperate in generating different bias resistances according to a signal level of an input color signal component. The gain of the respective transistor which ultimately amplifies and outputs each of the color signals advantageously can be varied by varying the bias of the transistor according to the signal level of the input color signal. As a result, the circuit minimizes deviation between the gamma characteristics of the red, green and blue video signals. Accordingly, a constant white balance can be maintained irrespective of the signal level of input video signals. The circuitry thus permits excellent reproduction of the original colors on the screen or tube.

REFERENCES:
patent: 4127868 (1978-11-01), Nagaoka et al.
patent: 4547797 (1985-10-01), Mick
patent: 5260774 (1993-11-01), Takayama
patent: 5267026 (1993-11-01), Kawahara et al.
patent: 5283635 (1994-02-01), Suzuki et al.
patent: 5315378 (1994-05-01), Satou et al.
patent: 5361093 (1994-11-01), Yamamoto et al.
patent: 5402182 (1995-03-01), Sugiura

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