Color temperature correction of color video projectors

Details Color temperature correction of color video projectors Color temperature correction of color video projectors

1986-01-29

1987-10-20

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 29, 358 60, 358 74, H04N 931, H04N 973

Patent

active

047017880

ABSTRACT:
A color video projector of the type employing red, green and blue cathode ray tubes, dichroic mirrors and a final single lens through which the red, green and blue light from the CRTs is projected on a screen exhibits non-uniform color temperature across the width of the screen. Compensating waveforms for the red, green and blue video signals are generated and multiplied with the respective red, green and blue contrast signals, the products then being multiplied with the red, green and blue video signals respectively and applied to the cathodes (or grids) of the red, green and blue CRTs respectively to provide a more uniform color temperature across the width of the screen.

REFERENCES:
patent: 4300156 (1981-11-01), Boyd
patent: 4607280 (1986-08-01), Kurg

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