Patent ID: 8474984
Filing Date: 2013-07-02
Classification: G03B,H04N

Abstract:
1. A projection display device comprising: a light source; an optical intensity-equalizing element that equalizes an optical intensity of the light emitted from the light source; an optical modulating element that performs a spatial intensity modulation of an input light and outputs the spatially intensity-modulated light; an optical diffusion element that is arranged between the optical intensity-equalizing element and the optical modulating element, the optical diffusion element diffusing the light from the optical intensity-equalizing element; a relay optical system that guides the light from the optical diffusion element to the optical modulating element, the relay optical system being configured such that an output end of the optical intensity-equalizing element and a display element plane of the optical modulating element are optically conjugate; and a projection optical system that projects the spatially intensity-modulated light from the optical modulating element to a screen, wherein the relay optical system includes a first lens unit that condenses an output light from the optical intensity-equalizing element and a second lens unit that further condenses a light from the first lens unit, the optical diffusion element is arranged between the optical intensity-equalizing element and a lens of the first lens unit, the lens being arranged at a position most proximate to a light incident side, and the second lens unit and the optical intensity-equalizing element are arranged such that an optical axis of the second lens unit and a center of the output end of the optical intensity-equalizing element are shifted in a same direction from an optical axis of the first lens unit.