BACK PROJECTION LIQUID CRYSTAL PROJECTION

摘要

PROBLEM TO BE SOLVED: To prevent the contrast drop of projected video images and to improve image quality by providing a third polarizing plate in one body with the lenticular lens in the same polarization direction as a second polarizing plate on the outer side of a lenticular lens integrally. SOLUTION: The third polarizing plate 11 in the same polarization direction as the second polarizing plate 123 is provided on the outer side of the lenticular lens 131 integrally with the lenticular lens 131. Light to which spirally polarized space distribution is supplied on a liquid crystal panel 121 is converted to the light provided with brightness and darkness space distribution by selectively passing through only the light in an optical polarization direction by the second polarizing plate 123. The light is magnified and projected at the back of a screen constituted of a Fresnel lens 129 and the lenticular lens 131 from a projection lens 127. The Fresnel lens 129 converges the light emitted from the projection lens 127 at an observation position and the lenticular lens 131 controls and diffuses the light passed through the Fresnel lens 129 in an optional direction. Then, only the light in a prescribed polarization direction is passed through at the third polarizing plate 11.