Patent ID: 7648244
Filing Date: 2010-01-19
Classification: G02B,G03B,H04N

Abstract:
1. A projection-type image display apparatus, comprising: an illuminating unit to produce a collimated light beam from a plurality of light sources that emit beams of different wavelength bands; an optical integrator to receive the collimated light beam from the illuminating unit and to produce a uniform beam; an image-forming system to receive the uniform beam from the optical integrator and to produce an image by selectively reflecting the uniform beam; a beam splitter disposed in an optical path between the illuminating unit and the image-forming system to change the optical path of incident beams such that a beam incident from the illuminating unit is directed toward the image-forming system while a beam incident from the image-forming system is directed toward a screen; and a projection lens unit disposed adjacent to the beam splitter and opposite to the image-forming system to enlarge the image produced by the image-forming system and to project the enlarged image onto the screen, wherein the illuminating unit comprises: