Color tracking method of a display device when brightness level

Details Color tracking method of a display device when brightness level Color tracking method of a display device when brightness level

1995-03-20

1997-07-01

Hsia, Sherrie

Television

Image signal processing circuitry specific to television

Color balance or temperature

348687, 348673, H04N 973, H04N 557

Patent

active

056443676

ABSTRACT:
The invention is provided to automatically track the color regardless of the adjustment of the brightness level of a display device. The method provided comprises the first step of calculating a bias voltage, Rb, Gb, Bb, for the Red, Green and Blue cathode respectively, responsive to a brightness voltage applied to the control grid terminal, such that the condition of (Rb-G):(Gb-G):(Bb-G)=(Rbmin-Gmin):(Gbmin-Gmin):(Bbmin-Gmin) holds. The second step of the invention is to output the Rb, Gb, Bb obtained in the first step to each bias voltage input terminal of the video control circuit for the Red, Green and Blue cathode respectively, such that the color of the display device is independent from the change of the brightness value G.

REFERENCES:
patent: 4118729 (1978-10-01), Shanley, II
patent: 5400086 (1995-03-01), Sano

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