The addition of DMD illumination modulator(s) 702 in series with
projection SLM(s) 706/709 to produce high-performance projection displays
with improved optical efficiency, reliability, and lower maintenance
requirements. This approach eliminates the vibration, audible noise, and
safety problems associated with high speed rotating color filter wheels
203 commonly used in SLM projectors and controls the light applied to
individual areas of the projection SLM(s).