通过光致垂直取向法使用液晶和光敏丙烯酸预聚物的混合物提高器件性能。
Improvement in device performance from a mixture of a liquid crystal and photosensitive acrylic prepolymer with the photoinduced vertical alignment method.
作者信息
Ho Czung-Yu, Lin Fa-Hsin, Tao Yu-Tai, Lee Jiunn-Yih
机构信息
Institute of Chemistry, Academia Sinica, Taipei 115, Taiwan; Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan.
Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan.
出版信息
Sci Technol Adv Mater. 2011 Dec 2;12(6):065002. doi: 10.1088/1468-6996/12/6/065002. eCollection 2011 Dec.
In a multicomponent nematic liquid crystal (NLC) mixture of a liquid crystal (negative-type NLC) and a photosensitive acrylic prepolymer, photopolymerization upon UV irradiation induces the separation of the LC and photosensitive acrylic prepolymer layers, thereby leading to a vertical arrangement of LC molecules. In this study, we propose a simple vertical alignment method for LC molecules, by adding a chiral smectic A (SmA∗) liquid crystal having homeotropic texture characteristics to an NLC mixture solution. Measurements of electro-optical properties revealed that the addition of the SmA∗ LC not only strengthened the anchoring force of the copolymer alignment film surface, but also significantly enhanced the contrast ratio (∼73%), response time and grayscale switching performance of the device.
在由液晶（负型向列相液晶）和光敏丙烯酸预聚物组成的多组分向列相液晶（NLC）混合物中，紫外线照射引发的光聚合反应会导致液晶层和光敏丙烯酸预聚物层分离，从而使液晶分子垂直排列。在本研究中，我们提出了一种简单的液晶分子垂直排列方法，即在向列相液晶混合溶液中添加具有垂直排列织构特性的手性近晶A（SmA∗）液晶。电光特性测量结果表明，添加SmA∗液晶不仅增强了共聚物取向膜表面的锚定作用力，还显著提高了器件的对比度（约73%）、响应时间和灰度切换性能。
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