Patent ID: 7384148
Filing Date: 2008-06-10
Classification: G02B,H04N

Abstract:
1. A projection type image display apparatus, comprising: a linearly polarizing element in the form of a flat plate for emitting light polarized in one direction from within a flux of light incident along an optical axis; a polarizing beam splitter disposed in an inclined relationship to a predetermined angle with respect to a plane perpendicular to the optical axis and having a demultiplexing face which passes S or P polarized light therethrough but reflects polarized light having a polarization direction perpendicular to that of the polarized light which passes through said demultiplexing face, said polarizing beam splitter receiving, at the demultiplexing face thereof, the flux of light emitted from said linearly polarized element; a light modulation section for receiving the flux of light emitted from the demultiplexing face of said polarizing beam splitter, changing the polarization direction of the received flux of light in accordance with an image signal and reflecting the flux of light so as to be introduced back to the demultiplexing face of said polarizing beam splitter; and an adjustment section for adjusting an angle of said linearly polarizing element, said linearly polarizing element being set to an angle at which the light having passed through said beam splitter after reflected by said light modulation section exhibits a maximum contrast; said linearly polarizing element being disposed in such a manner as to extend perpendicularly to a reference plane which includes a normal to the demultiplexing face and the optical axis and be inclined at an acute angle in the opposite direction to the demultiplexing face with respect to the plane perpendicular to the optical axis.