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    • 5. 发明申请
    • POLARIZATION SENSITIVE FRONT PROJECTION SCREEN
    • 极化敏感前投影屏幕
    • US20120212812A1
    • 2012-08-23
    • US13504339
    • 2010-11-10
    • Michael F. WeberYufeng LiuTimothy J. Nevitt
    • Michael F. WeberYufeng LiuTimothy J. Nevitt
    • G03B21/60
    • G03B21/604
    • A projection system is disclosed, in which a screen may have improved rejection of ambient light by having a high reflectivity at low angles of incidence for a polarization parallel to that of the projector, a low reflectivity at high angles of incidence for a polarization parallel to that of the projector, and a low reflectivity at both low and high angles of incidence for a polarization perpendicular to that of the projector. In some embodiments, for p-polarized light polarized parallel to the projector, the power reflectivity is high at low angles of incidence and decreases to a low value at high angles of incidence. In some embodiments, for p-polarized light polarized perpendicular to the projector, the power reflectivity is low at low angles of incidence. In some embodiments, for s-polarized light polarized perpendicular to the projector, the power reflectivity remains low at all angles of incidence. In some embodiments, the screen includes a thin film structure that has alternating quarter-wave layers of isotropic and birefringent materials, which are refractive-index-matched for light polarized perpendicular to the projector, which form a high reflector at normal incidence for light polarized parallel to the projector, and which exhibit Brewster's angle effects for p-polarized light polarized parallel to the projector at high angles of incidence. The Brewster's angle effect may be reached by use of a light-scattering layer that increases the effective incident refractive index.
    • 公开了一种投影系统,其中屏幕可以通过在平行于投影仪的偏振的低入射角具有高反射率而具有改善的环境光的抑制,在与入射角平行的偏振的高入射角处的低反射率 投影仪的偏振角以及垂直于投影仪的偏振的低和高入射角的低反射率。 在一些实施例中,对于平行于投影仪偏振的p偏振光,在低入射角下的功率反射率高,并且在高入射角下降低到低值。 在一些实施例中,对于垂直于投影仪偏振的p偏振光,功率反射率在低入射角下较低。 在一些实施例中,对于垂直于投影仪偏振的s偏振光,功率反射率在所有入射角保持较低。 在一些实施例中,屏幕包括薄膜结构,其具有交替的各向同性和双折射材料的四分之一波长层,其对于垂直于投影仪偏振的光进行折射率匹配,其在垂直入射时形成用于光偏振的正反射器 平行于投影仪,并且以高入射角度平行于投影仪偏振的p偏振光表现出布鲁斯特的角度效应。 布鲁斯特的角度效应可以通过使用增加有效入射折射率的光散射层达到。