Patent ID: 6854851
Filing Date: 2005-02-15
Classification: G03B

Abstract:
1. A projection display, comprising: a light source unit which comprises a light source and a reflector; an illumination optics unit for converting a light beam emission from said light source unit into approximately parallel light rays; a video display device for generating an optical image by modulating a light beam emission from said illumination optics unit in accordance with a video signal; a projection unit for projecting image light which is received from said video display device; and a plurality of variable apertures comprising at least a first variable aperture and a second variable aperture, each of which has at least a first state in which the light beam emission is blocked in accordance with the visibility angle characteristic of said video display device and a second state in which the aperture is maximized; wherein: said first variable aperture being first in order followed by said second variable aperture, relative to a direction of said light beam emission from said light source unit, and said first variable aperture has a larger opening area than said second variable aperture.