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    • 6. 发明公开
    • Light recovery for projection displays
    • LichtwiederherstellungfürProjektions显示
    • EP1918773A1
    • 2008-05-07
    • EP08151083.6
    • 2002-04-18
    • Wavien, Inc.
    • Li, Kenneth, K.
    • G03B21/28
    • G02B27/0994G02B6/0006G02B6/10G02B17/06G02B19/0028G02B19/0047G02B26/008H04N9/315
    • A light recovery apparatus for a projection display comprises a reflector (702) having a first (704) and a second (706) focal points; a source (708) of electro-magnetic radiation disposed proximate to said (704) focal point of said reflector (702) to emit rays of radiation that reflect from said reflector (702) and converge substantially at said second (706) focal point; a retro-reflector (712) disposed opposite said reflector (702) to reflect at least a portion of the electromagnetic radiation that does not impinge directly on said reflector (702) toward said reflector (702) through the (704) focal point of said reflector (702) to increase the flux intensity of the converging rays; a light pipe (416) having an input surface and an output surface, said input surface of said light pipe (416) disposed proximate to said second (706) focal point to collect and transmit substantially all of said radiation; and polarization beam splitters (766) disposed proximate said output surface, said polarization beam splitters (766) collecting and polarizing substantially all of said radiation into a first polarization (768) and a second polarization (770). Radiation of said first polarization (768) is transmitted and radiation of said second polarization (770) is reflected toward said output surface. A wave plate (772) is disposed in a path of said radiation of said second polarization (770).
    • 用于投影显示器的光回收装置包括具有第一(704)和第二(706)焦点的反射器(702) 靠近所述反射器(704)的所述(704)焦点设置的电磁辐射源(708),以发射从所述反射器(702)反射并基本上在所述第二(706)焦点处会聚的辐射射线; 反射器(712),与所述反射器(702)相对设置,以将至少一部分电磁辐射直接反射到所述反射器(702)上,以通过所述反射器(702)的所述(704)焦点反射到所述反射器 反射器(702)以增加会聚射线的通量强度; 具有输入表面和输出表面的光管(416),所述光管(416)的所述输入表面设置成靠近所述第二(706)焦点,以收集和传播基本上所有的所述辐射; 和偏振分束器(766),所述偏振分束器(766)收集并将所有所述辐射基本上聚焦成第一偏振(768)和第二偏振(770)。 透射所述第一偏振(768)的辐射,并且将所述第二偏振(770)的辐射反射向所述输出表面。 波片(772)设置在所述第二偏振(770)的所述辐射的路径中。