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    • 25. 发明授权
    • Holographically-formed polymer dispersed liquid crystals with multiple gratings
    • 具有多个光栅的全息形成的聚合物分散液晶
    • US06538775B1
    • 2003-03-25
    • US09398964
    • 1999-09-16
    • Christopher C. BowleyAdam K. FontecchioJaujeng LinGregory P. CrawfordSadeg M. FarisLe Li
    • Christopher C. BowleyAdam K. FontecchioJaujeng LinGregory P. CrawfordSadeg M. FarisLe Li
    • G03H102
    • G03H1/28G02B5/203G02B5/32G02F1/13342G03H1/0236G03H1/0248G03H1/04G03H1/265G03H2001/2231G03H2223/12G03H2223/18G03H2260/12G03H2260/33
    • A multicolored reflection liquid crystal display device includes a pair of substrates having a reflective holographic polymer dispersed liquid crystal (H-PDLC) film disposed therebetween. The H-PDLC film contains at least two different reflection gratings capable of reflecting two different wavelengths of light. A multicolored reflection H-PDLC is obtained by simultaneously illuminating a plurality of regions of a film comprised of a mixture of a liquid crystal and a photo-polymerizable monomer with a plurality of holographic light patterns capable of providing liquid crystal layers of different spacings so as to obtain different reflection gratings in each of the regions. A mask is placed between each of the laser light beams and the film to form a pattern of light and dark regions on the film. Each mask is positioned such that at least one light region of a first beam pair coincides with at least one dark region of a second beam pair within the film. A multiple grating liquid crystal display device including an H-PDLC film having a first region comprising liquid crystal and matrix polymer layers forming a transmission grating and a second region comprising liquid crystal and matrix polymer layers forming a reflection grating capable of reflecting a preselected wavelength of light also is described.
    • 多彩反射液晶显示装置包括一对基板,其具有设置在其间的反射全息聚合物分散液晶(H-PDLC)膜。 H-PDLC膜包含能够反射两种不同波长的光的至少两种不同的反射光栅。 通过同时用能够提供不同间隔的液晶层的多个全息光图案同时照射由液晶和可光聚合单体的混合物组成的膜的多个区域来获得多色反射H-PDLC,从而 以在每个区域中获得不同的反射光栅。 在每个激光束和膜之间放置掩模以在膜上形成光和暗区域的图案。 每个掩模被定位成使得第一光束对的至少一个光区与膜内的第二光束对的至少一个暗区重合。 一种多光栅液晶显示装置,包括具有包括液晶的第一区域和形成透射光栅的基质聚合物层的H-PDLC膜,以及包含液晶的第二区域和形成能够反射预选波长的反射光栅的基质聚合物层 光也被描述。
    • 26. 发明授权
    • Reflective film material having symmetrical reflection characteristics and method and apparatus for making the same
    • 具有对称反射特性的反射膜材料及其制造方法和装置
    • US06377325B2
    • 2002-04-23
    • US08891877
    • 1997-07-09
    • Sadeg M. FarisLe Li
    • Sadeg M. FarisLe Li
    • G02F11335
    • G02F1/1335C09D5/36C09D13/00C09K19/00G02B5/3016
    • Disclosed are novel reflective films having symmetrical reflection characteristics on the upper and lower surfaces thereof. Preferably, such films are made from cholesteric liquid crystal (CLC) material, wherein the pitch of the helices of the liquid crystal molecules therein varies along the thickness dimension (i.e. transverse to the surface) of the film. Depending on the final spiral structure of the materials utilized, the CLC circularly polarizing film materials reflect either left-handed or right-handed circularly polarized light. In a first illustrative embodiment, the CLC film has a laminated construction in order that both the upper and lower surfaces thereof have substantially the same reflection characteristics over its tuned reflection band. In second illustrative embodiment, the CLC film has a laminated construction in order that both the upper and lower surfaces thereof have substantially the same reflection characteristics over its broadband reflection band. By virtue of their circularly polarizing reflection characteristics, the CLC films of the present invention can be used to form polarization-encoded spatially multiplexed images (SMI) on radiation absorbing surfaces, coloring media with high brightness characteristics, CLC-based toner 2-D and 3-D xerographic printing processes, and the like.
    • 公开了在其上表面和下表面上具有对称反射特性的新型反射膜。 优选地,这种膜由胆甾型液晶(CLC)材料制成,其中其中的液晶分子的螺旋的间距沿膜的厚度尺寸(即横向于表面)变化。 根据所使用的材料的最终螺旋结构,CLC圆偏振膜材料反射左旋或右旋圆偏振光。 在第一示例性实施例中,CLC膜具有层叠结构,以使其上表面和下表面在其调谐反射带上具有基本相同的反射特性。 在第二示例性实施例中,CLC膜具有层叠结构,以便其上表面和下表面在其宽带反射带上具有基本相同的反射特性。 由于它们的圆偏振反射特性,本发明的CLC膜可用于在辐射吸收表面上形成偏振编码的空间多路复用图像(SMI),具有高亮度特性的着色介质,基于CLC的调色剂2-D和 3-D静电印刷工艺等。
    • 29. 发明授权
    • Single-layer reflective super broadband circular polarizer and method of
fabrication therefor
    • US5691789A
    • 1997-11-25
    • US550022
    • 1995-10-30
    • Le LiSadeg Mustafa Faris
    • Le LiSadeg Mustafa Faris
    • C08L83/04F24J2/40G02B5/30G02F1/1335G02F1/13C09K19/36
    • B82Y15/00F24J2/407G02B5/3016E06B2009/2464Y02E10/40
    • The present invention relates generally to broadband, reflective circular polarizers and, more particularly, to single layer super broadband, reflective circular polarizers. The polarizers of the present invention are made from a film of material, like a polymer having a cholesteric order, in which a second liquid crystal material, like a nematic liquid crystal, is distributed in a non-linear fashion across the thickness of the film in a plurality of liquid crystal-rich and liquid crystal-depleted sites in the polymer. The resulting polarizers have band passes approaching 2000 nm and reflect circularly polarized light which is either left-handed or right-handed depending on the final spiral structure of the materials utilized. The material of the present invention is fabricated by mixing commercially available polymers having a cholesteric order, a second liquid crystal material and a photoinitiator at a temperature which maintains the mixture in a liquid state. The polymer and the liquid crystal are present in a ratio by weight of 1:2, for example, and the photoinitiator is present in an amount of 0.6% by weight, for example, in the mixture. The heated mixture is then subjected to actinic radiation for a time and at an intensity sufficient to polymerize the polymer or the liquid crystal material or both. Under all polymerizing conditions the segregation rate of the liquid crystal material has to be greater than the polymerization rate of the material being polymerized. The liquid crystal segregates and diffuses, during polymerization, to sites of enlarged pitch in the polymer material from sites of shrunken pitch in the polymer material. Because the actinic light has an exponential intensity distribution due to light attenuation by, for example, light absorption, polymerization occurs in a non-linear fashion resulting in a non-linear distribution of the polymer and the liquid crystal material across the film.