| 摘要 |
<p>A projection-type display device comprises a light source (1) for emitting a light beam including the three primary colors, a color separation system (10) for separating the light beam three color light beams, light modulation units (3R, 3G, 3B) each having a liquid crystal panel with a polarizing plate on the output surface thereof for modulating each of the three color light beams in accordance with a video signal, a first phase plate (7R, 7G, 7B) provided on the output side of the polarizing plate for converting a linearly polarized light beam into a circularly polarized light beam, a second phase plate (8R, 8G, 8B) provided on the output side of the first phase plate for converting the circularly polarized light beam into a linearly polarized light beam, a light combining system (11) for combining the light beams that have passed through the second phase plate (11), and an optical projection system (2) for projecting the combined light beams on a screen (9) in enlarged fashion. The purpose of the invention is to prevent a reflected light beam caused by a optical projection system or a light combining system to be incident on a liquid crystal panel, as well as to convert a light beam to be projected on the screen or light beams incident on the light combining system into a linearly polarized light, to obtain a projection-type display device which has good display characteristics. <IMAGE></p> |
