Patent ID: 6793351
Filing Date: 2004-09-21
Classification: H04N

Abstract:
A closed loop three color alignment system for a digital projector comprising:a light source; an optical engine which splits a beam of light from said light source into first, second, and third wavelength 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 wavelength bands; wherein said first, second, and third wavelength bands are directed respectively to said first, second, and third spatial light modulator; a combiner which combines said modulated first, second, and third wavelength bands; a diverter which diverts a portion of said combined modulated wavelength bands to a 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; wherein said at least one component is an actuator; and wherein said microprocessor sends a signal to a driver for said spatial light modulator to index a row start position of said spatial light modulator.