White balance self-adjusting apparatus for use in color display

Details White balance self-adjusting apparatus for use in color display White balance self-adjusting apparatus for use in color display

1997-03-28

2000-08-01

Peng, John K

Television

Image signal processing circuitry specific to television

Color balance or temperature

348656, 348380, 348379, 348678, H04N 973, H04N 568

Patent

active

060974451

ABSTRACT:
A color display with a white balance self-adjusting function, including a DC-voltage-level/gain adjusting circuit for adjusting, on the basis of adjustment data, the DC voltage level and the gain of each of R, G and B primary color signals, thereby outputting the adjusted signals. Also includes is a CRT driving circuit responsive to the output signals of the DC-voltage-level/gain adjusting circuit for outputting CRT driving signals to drive the color CRT of the display, and a cathode current detecting circuit for detecting currents flowing through the cathode electrodes of the color CRT. Further a micro-controller for applying black and white reference level voltages, at predetermined points of time, to the DC-voltage-level/gain adjusting circuit to perform adjustment, comparing detection values from the cathode current detecting circuit, with preset reference values, generating data on the basis of the comparison results, storing the generated data in the non-volatile memories, and reading and supplying the stored data as adjustment data to the DC-voltage-level/gain adjusting circuit is included.

REFERENCES:
patent: 4298885 (1981-11-01), Okada
patent: 4516152 (1985-05-01), Willis
patent: 4523233 (1985-06-01), Tallant, II
patent: 4554578 (1985-11-01), Willis
patent: 4599642 (1986-07-01), Willis
patent: 4742387 (1988-05-01), Oshima
patent: 5204748 (1993-04-01), Lagoni
patent: 5258828 (1993-11-01), Sano et al.
patent: 5400086 (1995-03-01), Sano et al.
patent: 5512961 (1996-04-01), Cappels, Sr.
patent: 5726540 (1998-03-01), Klink

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