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    • 81. 发明授权
    • Optical unit, video display apparatus, and color switching method
    • 光学单元,视频显示设备和颜色切换方法
    • US06952241B2
    • 2005-10-04
    • US09942034
    • 2001-08-30
    • Satoshi OuchiTaro ImahaseNobuaki Kabuto
    • Satoshi OuchiTaro ImahaseNobuaki Kabuto
    • G02F1/13G02B27/28G02F1/1335G02F1/13357G03B21/00G03B21/14G09F9/00H04N5/74H04N9/31H04N9/12
    • G02B27/283G03B21/006G03B21/2073G03B33/08H04N9/3117
    • A projection-type video display apparatus has a polarizing beam splitter for matching light, which is outputted by a light source unit, to one of S polarizing light and P polarizing light, an optical characteristics switching element for electrically and periodically switching a wavelength band of light outputted by the polarizing beam splitter, a video display element, as a light valve element, for forming an optical image from light outputted by the light source unit, in accordance with a video signal, and a radiating unit for radiating a plurality of color light, which are sequentially outputted by the optical characteristics switching element, to the video display element, wherein light outputted by the video display element is incident on a projecting lens, and a light path from the light source unit to the projecting lens is U-shaped. Consequently, the projection-type video display apparatus becomes compact and has improved contrast.
    • 一种投射式视频显示装置,具有将由光源单元输出的光与S偏振光和P偏振光中的一种进行匹配的偏振光束分离器,用于电性地且周期性地切换波长带的光学特性切换元件 由偏振分束器输出的光,作为光阀元件的视频显示元件,用于根据视频信号从光源单元输出的光形成光学图像;以及辐射单元,用于发射多种颜色 由光学特性切换元件依次输出的光被照射到视频显示元件,其中由视频显示元件输出的光入射到投影透镜上,并且从光源单元到投影透镜的光路为U形, 成形。 因此,投影型视频显示装置变得紧凑并且具有改善的对比度。