Projection-type display device

Abstract

Abstract PURPOSE:To improve the utilization factor of light from a light source by converting one polarizing surface among an S polarizing component Lintegral and P polarizing component LP, both of which are obtained from a polarizing beam splitter, into the other polarizing surface with the use of a lambda/2 optical phase plate and setting their synthetic light beams to the illumination light of a light valve. CONSTITUTION:A total reflection prism 18 is disposed at the side where the P polarizing component of the polarizing beam splitter 7 is obtained through the reflection. The P polarizing component LP is reflected orthogonally against the total reflection prism 18 and projected in the same direction as the S polarizing component LS obtained by passing through the polarizing beam splitter 7. Light paths of the S polarizing component LS obtained in such a way and the S polarizing component LS* converted by the lambda/2 optical phase plate 19 are changed in each optical path, and synthesized so as to coincide at the prescribed position P0. The synthetic light of the S polarizing components LS and LS* is made flux having a narrow band-like flattening section extending in the horizontal direction with the aid of a semicylindrical lens 8, and supplied to a line right valve 10 as illumination light.

Inventors

• 👤 Masami Himuro
• 👤 氷室　昌美

Bibliographic Details