Patent ID: 6859239

Claim:
An image display apparatus, comprising: a source unit to generate a spatially uniform light beam that propagates along a first beam path in a first direction; an imaging unit to collect and focus the light beam, wherein the imaging unit includes: a first refractive optical element disposed in the first beam path, a second refractive optical element disposed in the first beam path, a first reflecting mirror disposed in a second beam path is oriented in a second direction that is different from the first direction and directed away from a digital micromirror device (“DMD”), and wherein the second reflecting mirror has a concave reflecting surface; the DMD to receive the light beam reflected by the second reflecting mirror and disposed in a third beam path defined by the second reflecting mirror and the DMD, wherein the third beam path is oriented in a third direction from the second direction; and a projection lens to collect and project the light beam reflected from the DMD and disposed in a fourth beam path defined by the DMD and the projection lens, wherein the fourth beam path is oriented in a fourth direction different from the third direction.