Patent ID: 8376553
Filing Date: 2013-02-19
Classification: G02B,G03B

Abstract:
1. An image display apparatus, comprising: a light modulation element; an illumination optical system which includes at least one light source unit including a plurality of light emitting units two-dimensionally arranged and illuminates the light modulation element; and a projection optical system for enlarging and projecting an image of the light modulation element on a projection surface, wherein: an image of the plurality of light emitting units is formed at a position corresponding to a stop of the projection optical system; the stop has an aperture shape of rotational asymmetry or of two-fold symmetry; illuminance intensity of each of the plurality of light emitting units is independently controllable; the projection optical system has a plurality of rotationally asymmetric reflecting surfaces bending a reference axis light beam and is an off-axial projection optical system projecting obliquely the reference axis light beam onto the projection surface, where the reference axis light beam being defined as a light beam passing through a center of the stop and a center of the light modulation element; and a shape of the light source unit is a shape of two-fold symmetry having widths different in a first direction and in a second direction and the second direction extends along an off-axial cross section, where the off-axial cross section being defined as a cross section including the reference axis light beam bent on the rotationally asymmetric reflecting surfaces, the first direction being defined as a direction along which a largest width of a light emitting area of the light source unit extends; and the second direction being defined as a direction orthogonal to the first direction.