-
1.发明授权Polymer dispersed liquid crystal material having an extended wave-length response 失效具有延长波长响应的聚合物分散液晶材料
公开(公告)号：US5211876A
公开(公告)日：1993-05-18
申请号：US546290
申请日：1990-06-29
IPC分类号： C09K19/54 , G02F1/1334
CPC分类号： C09K19/544 , G02F1/1334
摘要： Liquid crystal films are potentially useful for automotive displays and for automotive windows and sunroofs with variable optical transmission. The present invention provides a liquid crystal material having an extended wavelength response and a method for making the same. The size of the liquid crystal microdroplets within the material are controlled such that a polydisperse liquid crystal film is formed. Controlling the curing parameters during the cure of a supersaturated mixture of liquid crystal in polymer precursor allows for the fabrication of a polymer-dispersed liquid crystal material containing a multimodal distribution of microdroplet sizes which provides a film acting as both as a visible light shutter and a strong scattered of infrared radiation.
摘要翻译： 液晶膜对于汽车显示器和具有可变光传输的汽车窗户和天窗来说是潜在的。 本发明提供一种具有延长的波长响应的液晶材料及其制造方法。 控制材料内的液晶微滴的尺寸，使得形成多分散液晶膜。 在固化聚合物前体中的液晶的过饱和混合物期间控制固化参数允许制备聚合物分散的液晶材料，其包含微滴尺寸的多峰分布，其提供作为可见光快门的薄膜和 强散射的红外辐射。
-
2.发明授权
公开(公告)号：US4938568A
公开(公告)日：1990-07-03
申请号：US141033
申请日：1988-01-05
申请人： John D. Margerum , Anna M. Lackner , Elena Ramos , George W. Smith , Nuno A. Vaz , James L. Kohler , Charles R. Allison
发明人： John D. Margerum , Anna M. Lackner , Elena Ramos , George W. Smith , Nuno A. Vaz , James L. Kohler , Charles R. Allison
IPC分类号： C09K19/54 , G02F1/1334
CPC分类号： G02F1/1334 , C09K19/544 , Y10S359/90
摘要： A method of forming a polymer dispersed liquid crystal (PDLC) film is disclosed which consists of forming a solution of LC dissolved in a monomer, photopolymerizing the solution to form a film having a dispersion of LC bubbles therein, establishing a correlation between the LC bubble size and selected characteristics of the film, selecting a LC bubble size corresponding to desired film characteristics, and controlling the conditions of photopolymerization to achieve said LC bubble size. The LC bubble size is controlled by means of the UV exposure intensity, exposure temperature, exposure wavelength, LC concentration and/or concentration of polymerization initiator. Correlations are noted between LC bubble size and the resulting film's threshold and operating voltages for optical transmission, contrast ratio, absolute transmissivity and electro-optical response times. Special types of films, including in situ gratings and holograms, are obtained by periodically varying the conditions of polymerization over the film to produce a corresponding periodic spatial variation in the LC bubble size; different processes used to achieve this result are noted. Films with LC bubbles in a new size regime that significantly decreases the operating voltage threshold, and with gradients in the bubble size, are also disclosed.
摘要翻译： 公开了一种形成聚合物分散液晶（PDLC）膜的方法，该方法由形成溶解在单体中的LC溶液组成，使该溶液光聚合以形成其中具有LC气泡分散的膜，从而建立LC气泡之间的相关性 尺寸和选定的特性，选择对应于期望的膜特性的LC气泡尺寸，以及控制光聚合条件以实现所述LC气泡尺寸。 通过UV曝光强度，曝光温度，曝光波长，LC浓度和/或聚合引发剂的浓度来控制LC气泡尺寸。 在LC气泡尺寸和所得膜的阈值和光透射，对比度，绝对透射率和电光响应时间的工作电压之间存在相关性。 特殊类型的膜，包括原位光栅和全息图，通过周期性地改变膜上的聚合条件来获得LC气泡尺寸中相应的周期性空间变化; 注意到用于实现该结果的不同过程。 还公开了具有显着降低工作电压阈值和气泡尺寸梯度的新尺寸方案中的LC气泡的膜。
-
3.发明授权
公开(公告)号：US4728547A
公开(公告)日：1988-03-01
申请号：US933212
申请日：1986-11-21
申请人： Nuno A. Vaz , George W. Smith
发明人： Nuno A. Vaz , George W. Smith
IPC分类号： C09K19/54 , G02F1/1334 , B05D3/06 , C09K19/00
CPC分类号： C09K19/544 , G02F1/1334
摘要： Optically responsive films comprising birefringent nematic and/or birefringent chiral nematic liquid crystal microdroplets dispersed in UV-cured polymeric reaction products of di- and/or triallyl ethers and esters and suitable polythiols are disclosed.
摘要翻译： 公开了分散在二 - 和/或三烯丙基醚和酯和合适的多硫醇的UV-固化的聚合反应产物中的双折射向列型和/或双折射手性向列型液晶微滴的光学响应薄膜。
-
4.发明授权
公开(公告)号：US5225104A
公开(公告)日：1993-07-06
申请号：US668010
申请日：1991-03-12
IPC分类号： C09K19/54 , G02F1/1334
CPC分类号： G02F1/1334 , C09K19/544
摘要： A film of a polymer dispersed liquid crystal material having improved light scattering and solar attenuation properties, which utilizes a significantly reduced amount of the liquid crystal component as compared to conventional polymer dispersed liquid crystal films, is provided. These improved properties are obtained by the addition of preferably up to about three volume percent of an organic photoaccelerator chosen from the group of amines or aminobenzoates, to the liquid crystal-polymer precursor mixture prior to curing of the mixture.
摘要翻译： 提供了一种具有改进的光散射和太阳衰减特性的聚合物分散液晶材料的薄膜，其与传统的聚合物分散液晶膜相比利用显着减少的液晶组分量。 这些改进的性能是通过在固化混合物之前向液晶聚合物前体混合物中加入优选最多约3体积％的选自胺或氨基苯甲酸酯的有机光加速剂获得的。
-
公开(公告)号：US5142644A
公开(公告)日：1992-08-25
申请号：US666310
申请日：1991-03-08
IPC分类号： G02F1/13 , G02F1/1333 , G02F1/1334
CPC分类号： G02F1/13452 , G02F1/133365 , G02F1/1334
摘要： An electrical contact for use with an optically responsive, polymer dispersed liquid crystal film is provided. The preferred electrical contact means consists of a pair of U-shaped, electrically conductive spring connectors. Each of these spring connectors is rigidly biased against corresponding transparent electrodes provided on each of the surrounding transparent substrates, so as to provide a compressive clamping force against the electrode. This ensures an intimate and complete electrical connection between each spring connector and each transparent electrode. The spring connector may be formed from any electrically conductive material which is sufficiently strong yet yielding and which is sufficiently anodic with respect to the electrode material, a preferred material being a suitable beryllium copper alloy when the electrodes are formed from a material such as indium-tin oxide. The preferred spring connector also provides redundant electrical contact between each electrode and itself, therefore, enabling its use in large area devices, such as window panels, wherein it is imperative that failure at a single point of electrical contact does not result in failure of the electrical connection.
摘要翻译： 提供了一种与光学响应的聚合物分散液晶膜一起使用的电接触。 优选的电接触装置由一对U形导电弹簧连接器组成。 这些弹簧连接器中的每一个刚性地偏压设置在每个周围透明基板上的相应的透明电极，以便提供抵抗电极的压缩夹紧力。 这确保了每个弹簧连接器和每个透明电极之间的紧密和完整的电连接。 弹簧连接器可以由相当于电极材料充分强度而足够阳极的任何导电材料形成，优选的材料是合适的铍铜合金，当电极由诸如铟 - 氧化锡。 优选的弹簧连接器还在每个电极和其自身之间提供冗余的电接触，因此，使其能够用于大面积的装置，例如窗板，其中必须在单个电接点处的故障不会导致 电气连接。
-
公开(公告)号：US5021188A
公开(公告)日：1991-06-04
申请号：US458466
申请日：1989-12-28
申请人： Nuno A. Vaz , George W. Smith
发明人： Nuno A. Vaz , George W. Smith
IPC分类号： C09K19/54 , G02F1/1334
CPC分类号： C09K19/544 , G02F1/1334 , Y10S359/90
摘要： Optically responsive films comprising birefringent nematic and/or birefringent chiral nematic liquid crystal microdroplets dispersed in electron beam cured polymeric reaction products are disclosed.
摘要翻译： 公开了包含分散在电子束固化的聚合物反应产物中的双折射向列和/或双折射手性向列型液晶微滴的光学响应薄膜。
-
公开(公告)号：US4971719A
公开(公告)日：1990-11-20
申请号：US411178
申请日：1989-09-22
申请人： Nuno A. Vaz , George W. Smith
发明人： Nuno A. Vaz , George W. Smith
IPC分类号： C09K19/54
CPC分类号： C09K19/544 , Y10T428/10
摘要： Optically responsive films comprising birefringent nematic and/or birefringent chiral nematic liquid crystal microdroplets dispersed in electron beam cured polymeric reaction products are disclosed.
摘要翻译： 公开了包含分散在电子束固化聚合物反应产物中的双折射向列型和/或双折射手性向列型液晶微滴的光学响应薄膜。
-
公开(公告)号：US4946263A
公开(公告)日：1990-08-07
申请号：US274153
申请日：1988-11-21
IPC分类号： G02F1/133 , G02F1/1334
CPC分类号： G02F1/133382 , G02F1/1334
摘要： In an optical device containing material which is dielectric wherein the device is switchable between an inactive relatively opaque state and an activated relatively transparent state in response to the application of a driving electric field of sufficiently low frequency, a problem may arise in that the switching time between the inactive-opaque state and the activated-transparent state is increased and/or the light transmissivity in the activated-transparent state is decreased when the device is at a relatively low temperature. This problem is alleviated by applying a heating electric field of sufficiently high frequency as to heat the dielectric material while not switching the device to the activated-transparent state thereby raising the temperature of the device to decrease the switching time between the inactive-opaque state and the activated-transparent state and/or to increase the light transmissivity in the activated-transparent state. The dielectric material may be a polymer film containing dispersed liquid crystal droplets.
-
公开(公告)号：US4845329A
公开(公告)日：1989-07-04
申请号：US274152
申请日：1988-11-21
CPC分类号： H05B6/54 , B60S1/026 , H05B6/62 , H05B2214/02
摘要： In an automotive vehicle having a visual glass pane subject to collecting vision obscuring moisture in the form of ice, frost, mist, fog, etc., apparatus is provided for removing the collected moisture. Specifically, the apparatus comprises a transparent layer of dielectric material underlying the glass pane in heat conducting relationship thereto, and means for producing dielectric heating of the dielectric material to thereby heat the glass and remove the collected moisture. Preferably, the layer of dielectric material is a polymer film and the means for producing dielectric heating includes a pair of transparent electrodes extending over the layer of dielectric material. For ease of fabrication, the pair of electrodes may be interdigitated on the same side of the layer of dielectric material.
摘要翻译： 在具有视觉玻璃窗的机动车辆中，收集视觉遮挡了冰，霜，雾，雾等形式的水分，提供了用于去除收集的水分的装置。 具体地说，该装置包括与导热关系的玻璃板下面的介电材料的透明层，以及用于产生电介质材料的电介质加热从而加热玻璃并除去收集的水分的装置。 优选地，介电材料层是聚合物膜，并且用于产生电介质加热的装置包括在电介质材料层上延伸的一对透明电极。 为了易于制造，该对电极可以在电介质材料层的同一侧上交错。
-
公开(公告)号：US4775226A
公开(公告)日：1988-10-04
申请号：US880009
申请日：1986-06-30
IPC分类号： C09K19/54 , G02F1/133 , G02F1/1334 , G11B7/24 , G02F1/137
CPC分类号： G02F1/132 , C09K19/544 , G02F1/1334 , G11B7/24
摘要： A method of creating memory effect in an optically responsive film containing smectic liquid crystal microdroplets dispersed in a polymeric film by first heating it to a higher temperature such that the structure of the liquid crystal is transformed into an isotropic phase, and then cooling the liquid crystal from that higher temperature in an electric field of sufficient intensity such that the liquid crystal microdroplets remain in an aligned state of the smectic phase for a sufficiently long period of time.
摘要翻译： 通过首先将其加热到更高的温度使得液晶的结构转变为各向同性相，然后冷却液晶的方法，在含有分散在聚合物膜中的近晶液晶微滴的光学响应膜中产生记忆效应的方法 从足够强度的电场中的较高温度使得液晶微滴保持在近晶相的对准状态足够长的时间段。
-
-
-
-
-
-
-
-
-
搜索结果
10 条记录 (耗时 0.012 秒)
