Patent ID: 6508571
Filing Date: 2003-01-21
Classification: H04N

Abstract:
An illuminating apparatus adapted for use in a projection display that includes a liquid crystal display panel, said illuminating apparatus comprising:a plurality of light sources, each of which is operable so as to generate light that converges at a respective focal point; a plurality of light pipe integrators corresponding in number to said light sources, each of said light pipe integrators having an input side facing a respective one of said light sources, and an output side adapted to face the liquid crystal display panel, wherein the focal points at which the light from said light sources converge are coincident on said input sides of said light pipe integrators, respectively, said light pipe integrators converting the light incident on said input sides thereof into evenly distributed light that are radiated at said output sides thereof; a plurality of first lenses corresponding in number to said light pipe integrators, each of said first lenses being disposed between a respective one of said light pipe integrators and the liquid crystal display panel; a plurality of polarization converters corresponding in number to said light pipe integrators, each of said polarization converters being disposed between a respective one of said light pipe integrators and a respective one of said first lenses; a plurality of second lenses corresponding in number to said light pipe integrators, each of said second lenses being disposed between a respective one of said light pipe integrators and a respective one of said polarization converters, and forming an image of a virtual point-light source radiated at said input side of the respective one of said light pipe integrators to result in a smaller incident angle upon reaching the respective one of said polarization converters; and a principal condenser lens adapted to be disposed between said first lenses and the liquid crystal display panel such that the light from said first lenses converge at points on a plane of the liquid crystal display panel upon exiting said principal condenser lens.