Patent ID: 7648244

Claim:
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: a base having the plurality of light sources positioned at different locations thereon; at least one color filter with a predetermined curvature to reflect one or more beams of predetermined wavelength bands from among the beams emitted by the plurality of light sources such that the reflected one or more beams propagate in a first direction and to pass one or more remaining beams of other wavelength bands; and a reflector disposed on the base to cover the plurality of light sources and to accommodate the at least one color filter and having a reflecting surface to reflect the remaining one or more beams that pass through the at least one color filter in the first direction.