Liquid crystal projecting device

Abstract

Abstract PURPOSE:To improve optical efficiency by making the optical axis of illuminating light for a liquid crystal panel coincide with the optical axis of a projection optical system through a declination prism. CONSTITUTION:The optical axis of the condenser lens LSC of the illuminating light for the liquid crystal panel 11 is made to coincide with the optical axis of the projecting lens L1 of the projection optical system through the declination prism 12. Namely, when the panel 11 is illuminated at an incident angle delta, an image having the most excellent contrast is obtained. Then, an illumination system constituted of a light source LS such as a halogen lamp, and the condenser lens LSC is arranged so that the incident direction of the illuminating light may satisfy the incident angle delta with respect to the normal of the panel 11. Therefore, the same state as the case that the illuminating light for the liquid crystal panel is made incident from a position which faces to the projection optical system is obtained. Thus, the performance of the projection optical system is effectively utilized and the bright and vivid image is projected.

Inventors

• 👤 Koji Nakanishi
• 👤 中西　孝次
• 👤 Shinichiro Shinoda
• 👤 篠田　真一郎

Bibliographic Details