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    Absorbing dichroic filters
    2.
    发明授权
    Absorbing dichroic filters 失效
    吸收二氯过滤器

    公开(公告)号：US5200855A

    公开(公告)日：1993-04-06

    申请号：US728882

    申请日：1991-07-12

    申请人： William A. Meredith, Jr. ,  Paul M. LeFebvre

    发明人： William A. Meredith, Jr. ,  Paul M. LeFebvre

    IPC分类号： G02B5/28

    CPC分类号： G02B5/285

    摘要： High purity (95-99.5 percent) red, orange and yellow filters are disclosed which comprise a periodic stack of relatively low index of refraction dielectric material (L) such as SiO.sub.2 or MgF.sub.2 and absorbing relatively high index material such as silicon or Fe.sub.2 O.sub.3. Together, the low and high index materials provide a high index ratio (typically 1.7 to 2.5). The filters are fabricated according to designs such as (H/2 L H/2).sup.n, typically using only 5 to 7 layers. Despite the very small layer count, these filters provide overall optical performance which is at least the equivalent of all-dielectric filters of 30 or more layers, with color purity that is unachievable by all-dielectric filters and simple low cost design. In addition, our filters have inherently low stress levels and absorb and reflect unwanted light such as blue light. As a consequence, the filters are ideally suited for coating on flexible substrates such as plastics and for coating on lamp envelopes to form red or yellow bulbs which are ideally suited, for example, for use as automobile tail light bulbs, side marker bulbs and turn signal bulbs.

    Thin film dichroic color separation filters for color splitters in liquid crystal display systems
    4.
    发明授权
    Thin film dichroic color separation filters for color splitters in liquid crystal display systems 失效
    用于液晶显示系统中彩色分光器的薄膜二向色彩分离滤光片

    公开(公告)号：US5914817A

    公开(公告)日：1999-06-22

    申请号：US79997

    申请日：1998-05-15

    申请人： Stephen D. Browning ,  Paul M. LeFebvre ,  Basil Swaby

    发明人： Stephen D. Browning ,  Paul M. LeFebvre ,  Basil Swaby

    IPC分类号： G02B27/14 ,  H04N9/31 ,  G02B5/28

    CPC分类号： G02B27/1026 ,  G02B27/142 ,  G02B27/145 ,  H04N9/3105

    摘要： An optical filter is provided for use in color projection display imaging systems which utilize liquid crystal light valves for image modulation. The optical filter is a dichroic coating which separates light into different colors. The optical filter is located on a light transmissive surface of a color splitting device such as a Philips prism. The optical filter is formed from layers of at least two different dielectric materials including a high refractive index material, such as zirconium oxide and a low refractive index material such as aluminum oxide. The low refractive index material has an average refractive index of no less than about 1.6. The high refractive index material has an average refractive index which is sufficiently greater than the average refractive index of the low refractive index such that the average refractive index of the high refractive index material divided by the average refractive index of the low refractive index material yields a ratio that is greater than about 1.2 and less than about 1.55.

    摘要翻译： 提供了一种用于彩色投影显示成像系统中的滤光器，其利用液晶光阀进行图像调制。 滤光器是将光分成不同颜色的二向色涂层。 滤光器位于诸如Philips棱镜的分色装置的透光表面上。 滤光器由包括高折射率材料的至少两种不同介电材料的层形成，例如氧化锆和低折射率材料如氧化铝。 低折射率材料的平均折射率不小于约1.6。 高折射率材料的平均折射率足够大于低折射率的平均折射率，使得高折射率材料的平均折射率除以低折射率材料的平均折射率得到a 大于约1.2且小于约1.55。