Patent ID: 7222965
Filing Date: 2007-05-29
Classification: G02B

Abstract:
1. A projection image display apparatus for irradiating light in a polarized and converted form from a light source onto a light valve, forming an optical image in response to image signals, and providing enlarged projection of the optical image, said apparatus comprising: a flat-plate-shaped wire-grid polarized-beam splitter disposed with a plane inclined at an angle of about 45° to an incident optical axis, wherein said polarized-beam splitter splits, by beams of transmission or reflection, the light modulated by said light valve and having formed the optical image; a projection lens unit which projects in an enlarged fashion the optical image; an astigmatism correction element which corrects astigmatism of the optical image; and a driving circuit which drives said light valve; wherein said astigmatism correction element is disposed between said polarized-beam splitter and said projection lens unit and comprises a lens of which one side distant from said projection lens unit is thicker than another side close said projection lens unit, and further of which optical axis is eccentric towards said side distant from said projection lens unit.