Patent ID: 6747709
Filing Date: 2004-06-08
Classification: G02B,H04N

Abstract:
An optical system for a liquid crystal projector, comprising:an illuminating portion for allowing a white light from a light source to have a linear polarized light and a uniform light distribution; a dichroic mirror for filtering a first color light; a first color selector for polarization-converting any one of second color light and third color light passing through the dichroic mirror; a first polarizing beam splitter prism having a polarizing beam splitter surface transmitting or reflecting the second color light and the third color light in accordance with a polarization direction of the first color selector; a first liquid crystal display panel; a second liquid crystal display panel, to which the transmitted color light is inputted; a third liquid crystal display panel, to which the reflected color light is inputted; a second color selector for polarization-converting any one of combined second color light and the third color light, the second and third color lights polarization-converted in accordance with picture information from the second and third liquid crystal display panels being transmitted or reflected through the polarizing beam splitter surface and combined; a second polarizing beam splitter prism having a polarizing beam splitter surface for reflecting the first color light reflected by the dichroic mirror, the reflected first color light being inputted to the first liquid crystal display panel; a third polarizing beam splitter prism having a polarizing beam splitter surface for reflecting the first color light polarization-converted in accordance with picture information from the first liquid crystal display panel and transmitted through the polarizing beam splitter surface of the second polarizing beam splitter prism, and transmitting the second color light and third color light inputted through the second color selector,and for combining the first color light, the second color light, and the third color light; and a projection lens for expanding and projecting the combined light.