Patent ID: 6078363
Filing Date: 2000-06-20
Classification: G02F,H04N

Abstract:
A projection-type image display apparatus, comprising:an illumination unit;a polarization selecting and reflecting element which splits a light beam from the illumination unit into a first light beam and a second light beam having polarization states different from each other, reflects the first light beam to the illumination unit, and outputs the second light beam as linearly polarized light;a transmission-type liquid crystal display panel which controls a polarization state of the linearly polarized light and displays an image;a first polarization selecting element and a second polarization selecting element respectively provided on a light beam input side and a light beam output side of the transmission-type liquid crystal display panel; anda projection element which projects the image displayed by the transmission-type liquid crystal display panel,wherein a combination of the polarization selecting and reflecting element and the first polarization selecting element has a degree of polarization of at least about 99%, and at least one of the polarization selecting and reflecting element and the first polarization selecting element has a degree of polarization of less than about 99%.