Patent ID: 8444275

Claim:
A color projection display, comprising: a plurality of color channels, in which at least one color channel includes: a light source assembly including a multiplicity of pulse modulated light sources providing an aggregate light beam; a light modulation control subsystem to control pulse modulation parameters for the multiplicity of pulse-modulated light sources; illumination optics to direct the aggregate light beam to an image modulation plane; and a spatial light modulator in the image modulation plane having an array of addressable pixel elements, each of which is pulse width modulated during an imaging time interval to impart image data to the transiting aggregate light beam to provide image light; an optical combiner to redirect image light from the plurality of color channels onto a common optical path; and projection optics to receive the combined image light traversing the common optical path and to project the combined image light onto a display surface; wherein the light modulation control subsystem senses an aggregate light intensity signal for the aggregate light beam and controls the pulse modulation parameters for the multiplicity of pulse-modulated light sources responsive to the sensed aggregate light intensity signal to reduce light intensity fluctuations in the aggregate light beam within the imaging time interval, and wherein the pulse modulation parameters include pulse phase delay parameters for the multiplicity of pulse-modulated light sources that are controlled such that pulse trains from the multiplicity of pulse-modulated light sources overlap in an asynchronous fashion, and are controlled to randomly distribute the phases.