Patent ID: 8096661
Filing Date: 2012-01-17
Classification: H04N

Abstract:
1. A projection-type image display apparatus comprising: a light source unit; an optical modulator including an incident surface and an output surface both being substantially perpendicular to an optical axis of a light beam emitted from the light source, and configured to modulate a light beam emitted from the light source_with improved contrast; a first polarizer provided to the incident surface of the optical modulator; and a second polarizer provided to the output surface of the optical modulator, wherein the polarization direction of a light beam allowed to pass through the first polarizer and the polarization direction of a light beam allowed to pass through the second polarizer are substantially orthogonal to each other or are substantially matched with each other, a condenser lens positioned within the optical axis and at a predetermined distance from the light source unit so as to retain the cross-sectional shape of the light beam emitted from the light source unit at the condenser lens and the light source unit emits a cross shaped light beam, thereby achieving improved contrast.