Patent ID: 7864436
Filing Date: 2011-01-04
Classification: G03B,H04N

Abstract:
1. A rear projection type display apparatus, comprising: a screen; a projection optical system having at least one reflection mirror; a projection unit for modulating an illumination light from a light source with a light valve and for enlarging and projecting the illumination light onto a rear surface of the screen with the projection optical system; and a projection magnification correcting member, light rays being projected from the projection unit so that a central light ray, which is a ray passing through a center of an image, is made incident on the rear surface of the screen at an angle other than 90 degrees through the at least one reflection mirror of the projection optical system, wherein the projection unit is mounted on the projection magnification correcting member, the projection magnification correcting member includes a first member and a second member; the first member includes a first correction mechanism correcting a position of the projection unit in a direction substantially parallel to the central light ray, and is supported by a housing; and the second member includes a second correction mechanism correcting a position of the projection unit in a direction substantially parallel to a normal line to an image plane enlarged and projected from the projection unit without passing through the reflection mirror, and is supported by the first member.