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    • 3. 发明申请
    • FRONT PROJECTION SCREEN WITH HIGH CONTRAST
    • 具有高对比度的前投影屏幕
    • US20120013851A1
    • 2012-01-19
    • US13143211
    • 2010-01-06
    • YuFeng LiuDavid T. YustMyron K. JordanAndrew J. Ouderkirk
    • YuFeng LiuDavid T. YustMyron K. JordanAndrew J. Ouderkirk
    • G03B21/60G03B21/28G02B5/02
    • G03B21/56
    • A light diffusing optical construction is disclosed. The optical construction includes an asymmetric optical diffuser that scatters light in a first direction with a first viewing angle AH and in a second direction orthogonal to the first direction with a second viewing angle AV. The ratio AH/AV is at least about 2. The optical construction also includes a substantially specular reflector that reflects light that is not scattered by the asymmetric optical diffuser. The substantially specular reflector has a first average reflectance Ro in the visible at a substantially zero incident angle and a second average reflectance R45 in the visible at a substantially 45 degree incident angle. The ratio Ro/R45 is at least about 1.5. The optical construction also includes a light absorbing layer that absorbs light that is not reflected by the specular reflector.
    • 公开了一种光散射光学结构。 该光学结构包括一个不对称的光学漫射器,其以第一视角AH在第一方向上散射光,并在第二方向上以第二视角AV散射光。 比例AH / AV至少为2.光学结构还包括基本上镜面的反射器,其反射不被非对称光学漫射器散射的光。 基本上镜面的反射器在可见光中具有基本为零入射角的第一平均反射率Ro和可见光以大致45度入射角的第二平均反射率R45。 比率Ro / R45至少约为1.5。 光学结构还包括吸收未被镜面反射体反射的光的光吸收层。