Retroreflective dichroic reflector
    43.
    发明授权
    Retroreflective dichroic reflector 失效
    逆反射二向色反射器

    公开(公告)号:US6157486A

    公开(公告)日:2000-12-05

    申请号:US006579

    申请日:1998-01-13

    CPC分类号: G02B5/287 G02B5/124 G02B5/128

    摘要: Various combinations of retroreflective sheeting and multilayer polymeric reflective films are disclosed. The reflective film includes alternating layers of at least a first and second polymer, the alternating layers being configured to exhibit a high reflectance for light within a first spectral range and a low reflectance for light within a second spectral range. At least two of the alternating layers can have out-of-plane indices of refraction which differ by no more than 50% of the maximum in-plane refractive index difference. The polymeric layers can define optical repeating units arranged in a sequence to have a specific thickness profile designed to give sharpened spectral transitions. The retroreflective layer preferably exhibits retroreflectance in all planes of incidence, but alternately it can be retroreflective in at least one plane of incidence but not in at least one other plane of incidence.

    摘要翻译: 公开了反光片和多层聚合物反射膜的各种组合。 反射膜包括至少第一和第二聚合物的交替层,交替层被配置为对第一光谱范围内的光呈现高反射率,并且对第二光谱范围内的光具有低反射率。 交替层中的至少两个可以具有不超过最大面内折射率差的50%的平面外折射率。 聚合物层可以限定按顺序排列的光学重复单元,以具有特定的厚度分布,用于提供锐化的光谱转变。 回射层优选在所有入射平面上呈现后向反射,但是也可以在至少一个入射平面中进行回射,但不能在至少一个其它入射平面中。

    Liquid crystal display projection system using multilayer optical film
polarizers
    48.
    发明授权
    Liquid crystal display projection system using multilayer optical film polarizers 失效
    液晶显示投影系统采用多层光学偏光片

    公开(公告)号:US6088067A

    公开(公告)日:2000-07-11

    申请号:US494978

    申请日:1995-06-26

    摘要: A liquid crystal display (LCD) projection system including a projection panel, a light source, and a reflector. The projection panel includes an LCD and a polarizer on one side of the LCD and a reflective polarizer on the other side. The reflective polarizer is a multilayer stack of pairs of adjacent material layers. 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 quarter-wave plate 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 quarter-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.

    摘要翻译: 一种液晶显示器(LCD)投影系统,包括投影面板,光源和反射器。 投影面板在LCD的一侧包括LCD和偏振器,另一侧包括反射偏振器。 反射偏振器是一对相邻的材料层的多层堆叠。 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 四分之一波片固定到反射型偏振器上。 来自光源的光线通过反射型偏振器,并且依赖于它们的极化,或者被反射回到光源。 由反射偏振器反射的光被反射器反射回LCD。 四分之一波片和反射镜的使用有助于回收通常被认为是浪费的光,同时减少LCD内的热量积聚。