Patent ID: 6229581
Filing Date: 2001-05-08
Classification: G02B,H04N

Abstract:
A projection type picture display apparatus, comprising:a light source;a polarizing beam splitter capable of reflecting or transmitting an incident light;a decomposing/synthesizing prism assembly capable of receiving a reflected light from the polarizing beam splitter to decompose the incident light into red, green and blue lights, also capable of receiving reflected red, green and blue lights to synthesize these lights so as to produce a synthesized light which is then incident on the polarizing beam splitter;a plurality of reflective type liquid crystal display means capable of receiving, modulating and reflecting red, green and blue lights;a projection optical system capable of receiving a picture light passing through the polarizing beam splitter to project an enlarged picture on a screen; anda phase differential plate is provided between each reflective type liquid crystal display means and the decomposing/synthesizing prism assembly,wherein the decomposing/synthesizing prism assembly has a first dichroic mirror reflecting a first color light but transmitting a second and third color lights, and has a second dichroic mirror reflecting the second color light but transmitting the first and third color lights, with the first and second dichroic mirrors intersected with each other at a predetermined operable angle.