Patent ID: 7533996

Claim:
A contrast adjustable projector apparatus, comprising: a body; a light source, disposed in the body for generating light beams; a lens assembly, having a light inlet and an optical simulated exit pupil adjacent to the light inlet; an illumination unit, disposed in the body and connecting the light source and the lens assembly, in order to guide the light beams emitted from the light source to project onto the lens assembly, the illumination unit comprising: a controller; a digital micromirror device (DMD), controlled by the controller to rotate at a specific angle according to transmitted signals, in order to project the light beams transmitted from the light source as an on-state light, a flat state light or an off-state light, wherein the on-state light and a part of the flat state light are guided into the lens assembly through the light inlet; wherein the projector apparatus further comprises a regulation device provided at an outer side of the lens assembly, to adjustably shield at least a part of the flat state light which is incident to the light inlet and substantially overlaps with a part of an edge of the on-state light, to form an overlap region, whereby the overlap region is located within the exit pupil.