New Liquid Crystal Materials; Physical Properties and Performance in Displays for Automobile, High Information Density and Guest-host Applications
New Liquid Crystal Materials; Physical Properties and Performance in Displays for Automobile, High Information Density and Guest-host Applications
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新型液晶材料；
DOI：
10.1080/00268948308084253
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发表时间：
1983
期刊：
影响因子：
--
通讯作者：
G. Trickes
中科院分区：
文献类型：
--
作者：
M. Schadt;M. Petrzilka;P. Gerber;A. Villiger;G. Trickes
摘要介绍了四类新型液晶，即双环、三环和四环乙烷、哒嗪和四环氯二酯。每一类都具有独特的物理特性，例如低粘度η − 12 cP，低弹性比k33/k11 <$1，大介晶范围−40°C。250°C，大的负介电各向异性δ e − 9和/或低介电弛豫频率f e <$1 kHz。结果表明，表征极性双分子绕其短轴受阻转动的介电德拜弛豫时间τ受分子结构因素的影响比受其转动粘度γ1的影响大得多.介绍了由这些新化合物组成的用于扭曲液晶显示器和宾主液晶显示器的混合物的材料和电光性能。该混合物涵盖了广泛的应用，如高对比度，快速和多路复用汽车TN-LCD;正和负对比度宾主LCD;高信息密度矩阵和双频可寻址LCD。
Abstract Four novel liquid crystal classes are presented, namely bi-, tri-, and tetracyclic ethanes, pyridazines, and tetracyclic chloro-diesters. Each class exhibits distinct physical characteristics, such as low viscosities η − 12 cP, low elastic ratios k33/k11 ∼ 1, large mesomorphic ranges −40°C. 250°C, large negative dielectric anisotropies δ e − 9 and/or low dielectric relaxation frequencies f e ∼ 1 kHz. It is shown that the dielectric Debye relaxation time τ characterizing the hindered rotation of polar nematic molecules around their short axes is much more affected by molecular structural factors than by their rotational viscosity γ1. The material and electro-optical properties of mixtures for twisted nematic and guest-host LCDs comprising the new compounds are presented. The mixtures cover a wide range of applications such as high contrast, fast and multiplexable automotive TN-LCDs; positive and negative contrast guest-host LCDs; high-information density matrix, and dual-frequency addressable LCDs.