Patent ID: 7261422
Filing Date: 2007-08-28
Classification: G03B

Abstract:
1. A projection display apparatus, comprising: an illumination system for generating an optical beam propagating along a first optical beam path in a first direction; a light integrator, disposed on the first optical beam path, for homogenizing the optical beam; a first mirror module having a first fold mirror, for directing the optical beam from the light integrator to a second direction, such that the optical beam propagates along a second optical beam path, the first optical beam path and the second beam path defining an X-Z plane; a second mirror module, for directing the optical beam from the first mirror module to a third direction, such that the optical beam propagates along a third optical beam path, the second mirror module including a second fold mirror and a third fold mirror, the second fold mirror directing the optical beam from the second beam path to propagate toward the third fold mirror in a direction P a beam condensing module, comprising at least a condenser which is disposed on at least one of the first optical beam path, the second optical beam path, and the third optical beam path, for converging the optical beam; a total internal reflection (TIR) prism, comprising a prism surface for receiving the optical beam from the second mirror module; a light modulator, comprising a panel, for receiving the optical beam from the prism surface to illuminate the panel of the light modulator, and for selectively reflecting the optical beam, such that the reflected optical beam propagates along a fourth optical beam path in a fourth direction; and a set of projection lenses, for receiving and projecting the optical beam, which is reflected from the light modulator, onto a display screen; wherein the first optical beam path and the fourth optical beam path are substantially perpendicular with respect to each other.