Patent ID: 7646527

Claim:
A projection device receiving a light from a light source through an illumination optics for projecting to a deflecting type spatial light modulator having a plurality of micromirrors controlled to deflect to different deflection angles for projecting a predefined amount of light toward an optical pupil disposed on an image-display projection light path, wherein: said light source or said illumination optics is configured to project an illumination light with a non-uniform intensity distribution within a range of an incident NA (numeric aperture) to the each mirror element, a controller controls the micromirrors in a first control period, and a second control period to increase and decrease an intensity of light incident to said deflecting type spatial light modulator (SLM) in at least one of the first and the second control periods, or in one or more sub-control periods wherein at least one of the first and the second control periods is divided into two or more sub-control periods.