| 摘要 |
PCT No. PCT/JP97/01819 Sec. 371 Date Jan. 27, 1998 Sec. 102(e) Date Jan. 27, 1998 PCT Filed May 29, 1997 PCT Pub. No. WO97/45768 PCT Pub. Date Dec. 4, 1997A projection type display apparatus 1 is roughly composed of a polarized light beam illumination device 100, a polarization beam splitter 200, a reflection type liquid crystal device 300, and a projection optical system 500. The polarized light beam illumination device 100 includes a light source unit 110, a first optical element 120 and a second optical element 130, and the light beams emerging from the light source unit 110 are divided into a plurality of intermediate light beams by the first optical element 120 and thereafter converted into polarized light beams having approximately one kind of a polarization direction by the second optical element 130. The polarized light beams are reflected at the polarization beam splitter 200 and modulated by the reflection type liquid crystal device 300 and thereafter projected to a projection surface 600 through the projection optical system 500. According to the projection type display apparatus arranged as described above, the length of a light path is shortened to thereby prevent light loss as well as uneven brightness to a region to be illuminated, by which a projected image having uniform brightness and good quality can be obtained.
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