White balance correction circuit

Details White balance correction circuit White balance correction circuit

1993-12-14

1996-02-20

Groody, James J.

Television

Image signal processing circuitry specific to television

Color balance or temperature

348674, H04N 973, H04N 5202, H04N 969

Patent

active

054933420

ABSTRACT:
A white balance correction circuit, which receives a luminance signal (-Y) on the input terminal (20) and produces a modified luminance signal, has its gain G1 for the range of small input luminance signal level determined from the resistance ratio of resistors (29, 33), has its gain G2 for the range of medium input luminance signal level determined from the resistance ratio of the resistor 29 and resistors (33, 35) connected in parallel by a transistor (39) that has become conductive, and has its gain G3 for the range of large input luminance signal level determined from the resistance ratio of the resistor 29 and resistors (33, 34, 35) connected in parallel by the transistor (39) and a transistor (38) that has become conductive. Based on this modification, three picture projection tubes (23) have cathode voltage characteristics against the amplitude of luminance signal (-Y) represented by three polygonal lines that approximate the ideal luminance characteristics of the projection tubes.

REFERENCES:
patent: 4127868 (1978-11-01), Nagaoka et al.
patent: 5068718 (1991-11-01), Iwabe et al.
patent: 5296920 (1994-03-01), Sakaue et al.

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