Patent ID: 6174060
Filing Date: 2001-01-16
Classification: G02B,H04N

Abstract:
A projection-type display apparatus comprising:a light source for emitting white color light;a color separating/light guiding optics for separating said white color light emitted from said light source into three primary color beams and for guiding the separated primary color beams to a light modulating/color compositing/image projecting optics located at a deck different from that of said color separating/light guiding optics;said light modulating/color compositing/image projecting optics comprises:a cross-type dichroic prism with two reflection films crossing each other and having wavelength selectivity for selecting two of three primary colors;a projection lens disposed at an outgoing surface of said cross-type dichroic prism;polarized beam splitters having outgoing surfaces respectively facing to three incident surfaces of said cross-type dichroic prism and incident surfaces for receiving corresponding primary color beams incoming from said color separating/light guiding optics, said polarized beam splitters having polarizing films directed in predetermined directions in such a manner that said incident surfaces of said polarized beam splitters face toward said color separating/light guiding optics; andreflection-type spatial light modulating sections respectively facing to other surfaces opposing to said outgoing surfaces of said polarized beam splitters;wherein said color separating/light guiding optics comprises two independent dichroic mirrors which are spatially separated and a plurality of reflection mirrors; anda plane region occupied by said color separating/light guiding optics is entirely involved in a plane region occupied by said light modulating/color compositing/image projecting optics when seen in an up-and-down direction.