System and method for adjusting white balance of projector type

Details System and method for adjusting white balance of projector type System and method for adjusting white balance of projector type

1992-11-18

1994-02-15

Groody, James J.

Television

Image signal processing circuitry specific to television

Color balance or temperature

348776, 348744, H04N 973, H04N 974, H04N 931

Patent

active

052871738

ABSTRACT:
A system for adjusting the white balance of a projector type color display device is shown. The color display device includes three single color cathode ray tubes from which single color beams are projected onto a screen to form a colored image on the screen. The white balance adjusting system comprises a first device for feeding one of the three cathode ray tubes with all white signal to cause the same to project a single color image on the screen; a second device for detecting a luminance value of the single color image on the screen; a third device for deriving luminance values of the other single color images from the detected luminance value; and a fourth device for controlling the selected cathode ray tube in such a manner that the derived luminance values are put in a tolerance which is provided for dealing with a noise of the second device.

REFERENCES:
patent: 4599642 (1986-07-01), Willis
patent: 4746970 (1988-06-01), Hosokawa et al.
patent: 5181103 (1993-01-01), Aoyama

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