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    • 4. 发明申请
    • LIQUID CRYSTAL DISPLAY PROJECTION SYSTEM USING MULTILAYER OPTICAL FILM POLARIZERS
    • 液晶显示投影系统使用多层光学薄膜极化仪
    • WO1997001780A1
    • 1997-01-16
    • PCT/US1996007080
    • 1996-05-16
    • MINNESOTA MINING AND MANUFACTURING COMPANY
    • MINNESOTA MINING AND MANUFACTURING COMPANYWILLETT, Stephen, J.WEBER, Michael, F.OUDERKIRK, Andrew, J.JONZA, James, M.
    • G02B05/30
    • G02F1/13362G02B5/3033G02F2001/133545
    • A liquid crystal display (LCD) projection system (50) including a projection panel (52), a light source (56), and a reflector (58). The projection panel includes an LCD (60) and a polarizer (64) on one side of the LCD and a reflective polarizer (62) on the other side. The reflective polarizer is a multilayer stack of pairs (44) of adjacent material layers (41, 43). Each of the layer pairs exhibits a refractive index difference between the adjacent layers in a first direction in the plane of the reflective polarizer and exhibits essentially no refractive index difference between adjacent layers in a second direction in the plane of the reflective polarizer and orthogonal to the first direction. A quater-wave plate (66) is secured to the reflective polarizer. Light rays from the light source either pass through the reflective polarizer and on to the LCD, or are reflected back toward the light source, depending on their polarization. Light which is reflected by the reflective polarizer is reflected by the reflector back toward the LCD again. The use of the quater-wave plate and the reflector help to recycle what would typically be regarded as wasted light, while at the same time reducing heat build-up within the LCD.
    • 一种包括投影面板(52),光源(56)和反射器(58)的液晶显示器(LCD)投影系统(50)。 投影面板包括在LCD的一侧上的LCD(60)和偏振器(64)和在另一侧上的反射偏振器(62)。 反射偏振器是相邻材料层(41,43)的成对(44)的多层堆叠。 每个层对在反射型偏振片的平面中呈现第一方向上的相邻层之间的折射率差,并且在反射型偏振器的平面中的第二方向上的相邻层之间基本上没有折射率差异,并且与 第一个方向 四波形板(66)固定到反射偏振器。 来自光源的光线可以通过反射型偏振器,也可以通过LCD,或者根据其偏振光反射回光源。 由反射偏振器反射的光被反射器反射回LCD。 四波形板和反射器的使用有助于回收通常被认为是浪费的光,同时减少LCD内部的热积聚。