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11. 发明申请

US20080225237A1 PROJECTION DISPLAY DEVICE 有权
标题翻译：投影显示设备
公开(公告)号：US20080225237A1
公开(公告)日：2008-09-18
申请号：US12045827
申请日：2008-03-11
申请人： Ryuhei AMANO , Michihiro Okuda
发明人： Ryuhei AMANO , Michihiro Okuda
IPC分类号： G03B21/14
CPC分类号： H04N9/3167 , G02B13/16 , G02B17/0852 , H04N9/3105
摘要： An imager is shifted with respect to an optical axis of a refractive optical system. Thereby, a throw distance of a projector is shortened. A wavelength-selective half wavelength plate for rotating a polarization direction of green light beams is disposed between a dichroic prism and the refractive optical system in such a manner that the polarization direction of the green light beams is in parallel to the shifting direction. Thereby, the green light beams are incident onto the refractive optical system as P-polarized beams, whereby a transmittance of the green light beams in the refractive optical system is increased, while suppressing lowering of the light amount of the green light beams, and color non-uniformity resulting from lowering of the light amount of the green light beams.
摘要翻译：成像器相对于折射光学系统的光轴移动。因此，投影机的投射距离缩短。用于旋转绿色光束的偏振方向的波长选择性半波长板以这样的方式设置在分色棱镜和折射光学系统之间，使得绿色光束的偏振方向平行于移动方向。由此，绿色光束作为P偏振光束入射到折射光学系统上，从而在折射光学系统中的绿色光束的透射率增加，同时抑制绿色光束的光量的降低和颜色由于绿色光束的光量的降低而导致的不均匀性。

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