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蓝相液晶的旋光特性与消除

Optical rotatory of blue phase liquid crystal and its elimination

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摘要

为了实现蓝相液晶中旋光能力性能的模拟计算, 建立了蓝相液晶的一维模型, 对蓝相液晶在正交线偏光片和正交圆偏光片下的旋光能力进行了模拟计算, 并研究了蓝相液晶对外界环境光的反射特性。首先对胆甾相液晶的旋光特性进行了理论和模拟计算结果之间的对比。然后对比蓝相液晶与胆甾相液晶的结构特点, 建立了高倾角的胆甾相液晶模型来作为蓝相液晶的一维模型, 高倾角的角度由各向同性相的序参数来得到。利用该一维模型模拟计算了蓝相液晶的旋光特性, 与实验结果相符, 然后模拟计算了大螺距蓝相液晶在正交线偏光片和正交圆偏光片下的透过率, 最后模拟计算了这两种情况下蓝相液晶对外界环境光的反射特性。模拟结果表明:使用正交圆偏光片, 可以有效地消除大螺距蓝相液晶在可见光范围的旋光特性和Bragg反射,可见光整体旋光角度从5.2°降低到0.06°。结果将对提高蓝相液晶显示器的显示特性有很大的帮助。

Abstract

In order to realize the simulation of optical rotatory of blue phase liquid crystal, the one-dimensional model is established, and the optical rotatory of blue phase liquid crystal between crossed linear or circle polarizers is simulated, and the reflection is investigated. The theoretical and simulated results of optical rotatory of cholesteric liquid crystal are compared. Compared with the structures of cholesteric and blue phase liquid crystal, the cholesteric liquid crystal with high tilt angle is founded as the one-dimensional model of blue phase liquid crystal, and the tilt angle can be obtained from the order parameter of isotropic phase. Based on the one-dimensional model, the simulated result of optical rotatory of blue phase liquid crystal agrees well with the experimental results. The transmittances of blue phase liquid crystal with large pitch between the crossed linear or circle polarizers are simulated, and the reflection for the ambient light is also simulated. The results show that the circle polarizers can effectively eliminate the optical rotatory and Bragg reflection of large pitch blue phase liquid crystal in visible light range, the average rotatory angle in the whole visible light range is less than 006° from 5.2° for crossed linear polarizers. The results will have significant effect on improving the display characteristics of blue phase liquid crystal display.

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中图分类号:TN27;TN141.9

DOI:10.3788/yjyxs20183302.0101

所属栏目:材料与器件

基金项目:国家自然科学基金(No. 61475042, No.11304074)

收稿日期:2017-07-05

修改稿日期:2017-08-12

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马红梅:河北工业大学 应用物理系, 天津 300401
孙玉宝:河北工业大学 应用物理系, 天津 300401

联系人作者:马红梅(mhmtj@163.com)

备注:马红梅 (1975-), 女, 河北邢台人, 博士, 副教授, 2003年于河北工业大学获得硕士学位, 2017年于河北工业大学获得博士学位, 现为河北工业大学应用物理系主任, 主要从事液晶物理与液晶器件物理方面的研究。

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引用该论文

MA Hong-mei,SUN Yu-bao. Optical rotatory of blue phase liquid crystal and its elimination[J]. Chinese Journal of Liquid Crystals and Displays, 2018, 33(2): 101-108

马红梅,孙玉宝. 蓝相液晶的旋光特性与消除[J]. 液晶与显示, 2018, 33(2): 101-108

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