Patent ID: 6808270
Filing Date: 2004-10-26
Classification: H04N

Abstract:
A digital projector having closed loop three color alignment comprising:a light source; an optical engine which splits a beam of light from said light source into first, second, and third wavelengths bands; a first, second, and third spatial light modulator which imparts image data and first, second, and third fiducial data respectively to said first, second, and third wavelengths bands; wherein said first, second, and third wavelengths bands are directed respectively to said first, second, and third, spatial light modulator; a combiner which combines said modulated first, second, and third wavelengths bands; a diverter which diverts a portion of said combined modulated wavelengths bands to at least one sensor; wherein said sensor senses a relative position of the each of said fiducials and sends said position information to a microprocessor; wherein said microprocessor determines an error based on said relative position of said fiducials; wherein said microprocessor sends a signal to at least one component of said system to resolve said error; and wherein said fiducial data comprises a multiplicity of spatially separated fiducials each comprising a multiplicity of pixels in a predetermined pattern.