Patent ID: 6722768
Filing Date: 2004-04-20
Classification: G02F,H04N

Abstract:
A projector, comprising:an illuminating system that emits illumination light; a liquid crystal light valve that modulates light from the illuminating system according to image information; and a projection system that projects image light formed on a light emission surface of the liquid crystal light valve; wherein the illumination system includes: a light source device that emits a nearly parallel light; a light dividing element that divides the light emitted from the light source device into a plurality of partial light; and a superimposing lens that superimposes and illuminates the plurality of partial light emitted from the light dividing element on a light incidence surface of the liquid crystal light valve; wherein the liquid crystal light valve includes: a liquid crystal panel; a first polarizer located on a side of the light incidence surface of the liquid crystal panel; a second polarizer located on a side of the light emission surface of the liquid crystal panel; a first optical compensating plate that reduces a change of the contrast dependent on an angle of the illumination light emitted from the illumination optical system and applied onto the liquid crystal light valve from various directions, the first optical compensating plate being located between the liquid crystal panel and the first polarizer; and a second optical compensating plate that reduces a change of the contrast dependent on an angle of the illumination light emitted from the illumination optical system and applied onto the liquid crystal light valve from various directions, the second optical compensating plate being located between the liquid crystal panel and the second polarizer.