Colour temperature correction of colour video projectors

Details Colour temperature correction of colour video projectors Colour temperature correction of colour video projectors

H - Electricity

04

N

375/46, 350/61,

H04N 9/12 (2006.01) H04N 9/31 (2006.01) H04N 9/73 (2006.01)

Patent

CA 1238410

COLOUR TEMPERATURE CORRECTION OF COLOUR VIDEO PROJECTORS Abstract of the Disclosure A colour 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 colour 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 colour temperature across the width of the screen.

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