Liquid crystal projector

Abstract

Abstract PURPOSE: To improve the use efficiency of light by providing a polarized light rotating element which changes the polarization direction of light behind a liquid crystal display plate on an optical path of at least one of three kinds of color light of red, green, and blue. CONSTITUTION: On an optical path L1 , a mirror 7 which reflects red light and a polarized light rotating element 10 which has characteristics for converting the polarization direction of light transmitted through a liquid crystal display plate 9 by 90 deg. and is rotatable are provided. On an optical path L3 , mirrors 14 and 15 which reflect blue light and a polarized light rotating element 18 which has characteristics for converting the polarization direction of light transmitted through a liquid crystal display plate 17 by 90 deg. and is rotatable are provided. The P-polarized component wave of the red light is converted into an S-polarized component wave first by using the polarized light rotating element 10 and the P-polarized component wave of the blue light is converted into an S-polarized component wave by using the polarized light rotating element 18; and color composition is performed by a dichroic prism 19. Consequently, color composite light of extremely good light use efficiency can be obtained by making good use of transmissivity characteristics as they are.

Inventors

• 👤 Yukio Ogura

Bibliographic Details