共查询到19条相似文献,搜索用时 843 毫秒
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液晶含量对聚合物/液晶复合膜电光特性的影响--从正型向反型显示模式的转变 总被引:3,自引:2,他引:1
预聚物与正性液晶以适量配比合成的聚合物/液晶复合膜通常呈正型显示,即膜在关态时呈散射态,在开态时呈透射态。然而实验发现,用高的液晶配比合成的膜在适度电压驱动下能呈现反型显示,即这种膜在关态时呈透射态,在适度电压作用下呈散射态。在制膜过程中,如能将液晶做沿面取向处理,则膜的反型效应更加明显。用聚合物/液晶复合膜的反型显示机理,可开发出一系列新的光学显示器件。本实验研究了这种反型模式器件的电光特性,并建立相关的结构模型解释了实验结果。 相似文献
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《液晶与显示》2017,(2)
本论文主要介绍了一种用来空间上调节光的传播方向跟偏振态的光学薄膜结构。这种结构包含多层图案化的双折射薄膜,每一层都是由液晶聚合物(LCP)构成,这些聚合物的光轴方向由一层图案化的光配向层控制而变化。这种光调制器有两层功能层,第一层的设计是图案化的偏振光栅,光栅向量方向可以空间上变化,已达到空间调制光的传播方向的作用,第二层是一层图案化的光延迟膜,可以调节出射光的偏振态。这种多薄结构的厚度小于1μm,有助于提供高分辨率的光波前结构。它还可以当做光掩模,用来产生多畴配向结构的光配向层,应用到现代液晶显示器的制造中。为了验证这种结构的实用性,我们成功地制作了这种多层膜结构,并用它在单次曝光的条件下制作了一个两域光配向结构的液晶盒。这种光学薄膜结构在调制光的传播方向跟偏振态方面有着独特的功能,可以广泛应用于微型制造、三维成像、光通信、光计算、光开关等等领域。 相似文献
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液晶含量对聚合物/液晶复合膜电光特性的影响:从正型向反型显示模 … 总被引:1,自引:1,他引:0
预聚物与正性液晶以适量配比合成的聚合物/液晶复合膜通常呈正型显示,即膜在关态呈散射态,在开态时呈透射态。然而实验发现,用高的液晶配比合成的膜在适度电压驱动下能呈现反型显示, 相似文献
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A method of simultaneous field‐ and flow‐directed assembly of anisotropic titania (TiO2) nanoparticle films from a colloidal suspension is presented. Titania particles are oriented by an alternating (ac) electric field as they simultaneously advect towards a drying front due to evaporation of the solvent. At high field frequencies (ν > ~25 kHz) and field strengths (E > 300 V cm?1), the particles orient with their major axis along the field direction. As the front recedes, a uniform film with thicknesses of 1–10 µm is deposited on the substrate. The films exhibit a large birefringence (Δn ≈ 0.15) and high packing fraction (? = 0.75 ± 0.08), due to the orientation of the particles. When the frequency is lowered, the particle orientation undergoes a parallel–random–perpendicular transition with respect to the field direction. The orientation dependence on field frequency and strength is explained by the polarizability of ellipsoidal particles using an interfacial polarization model. Particle orientation in the films also leads to anisotropic mechanical properties, which are manifested in their cracking patterns. In all, it is demonstrated that the field‐directed assembly of anisotropic particles provides a powerful means for tailoring nanoparticle film properties in situ during the deposition process. 相似文献
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H. Hauser ÖVE R. Kloibhofer G. Stangl W. Fallmann P. Aigner J. Hochreiter 《e & i Elektrotechnik und Informationstechnik》1998,115(7-8):382-390
Depending on the angle between magnetization and current density in a thin permalloy film, the anisotropic magnetoresistive effect is utilized for high performance sensors. Both the parameters of the sputtering process and the sensor layout have to be optimized. Aiming a magnetic field resolution of some nT in a frequencey range from 0–1 kHz, the results of Wheatston-bridge circuits are discussed. 相似文献
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采用反应性液晶通过光聚合反应与聚芳醚光取向膜复合方法,制备了平面转换(In-plane switching,IPS)液晶显示器件,并在高温状态下对其光电显示和取向稳定性能进行了研究。结果显示,与单一聚芳醚光取向膜相比,利用复合光取向膜制备的IPS器件在高温状态下的光电显示和液晶取向稳定性能都得到了明显提高,在65℃明亮显示20h无液晶取向变化,在120℃维持2h无明显光量渗透。在线偏振紫外光下,光敏聚芳醚薄膜发生各向异性光交联反应,其交联程度最高可达67.4%。SEM分析结果发现,反应性液晶单体在UV光照射下,在聚芳醚光取向膜表面上发生了各向异性光聚合反应,沿先前光取向方向形成长度为0.4μm左右的棒状聚合物,有效限制了光取向膜中未交联的柔性基团的活动能力,进而有效增强了复合取向膜对液晶的取向稳定性。 相似文献
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Electrically controllable liquid-crystal (LC) microlens arrays have been fabricated using the process of anisotropic phase separation of the LC from its solution in a ultraviolet curable prepolymer. The focal length of nematic LC-based microlens arrays can be changed in milliseconds with an applied electric field. The ferroelectric LC microlens array exhibits the memory effect and modulates the transmitted light within a few microseconds, i.e., /spl sim/1000 times faster than the nematic LC-based microlens. Having no internal substructures to scatter light, these devices offer high efficiency and high light throughput that is different from polymer-dispersed devices. 相似文献
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用液晶与聚合物混合材料的各向异性相分离制备快速响应液晶盒 总被引:1,自引:1,他引:0
展示一种新型含有超薄液晶层(小于1μm)的快速响应液晶盒.总的响应时间(τon τoff)可以达到1.3ms。这种液晶器件可以通过对一种液晶和聚合物混合材料的各向异性相分离制备获得。偏光显微镜和扫描电子显微镜的观测结果确认了一种液晶/聚合物的双层膜机构的形成。实验结果表明液晶层的厚度可以简单地通过改变液晶在混合材料中的含量来精确调节。这种制备方法可以用来制作含有超薄液晶层的快速显示液晶器件用于视频显示方面的应用。 相似文献