STUDIES ON MOLECULAR ALIGNMENT MODEL IN NEMATIC LIQUID CRYSTALS EMPLOYING DYNAMICAL IMAGE-PROCESSING TECHNOLOGY

利用动态图像处理技术研究向列液晶分子排列模型

基本信息

批准号：
61550036
负责人：
YAMASHITA Masafumi
金额：
$ 1.15万
依托单位：
Science University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1988
项目状态：
已结题

项目摘要

The dynamical changes of the conoscopic figures and the interference intensities in the twisted nematic liquid crystal (LC) film with twisted angle of 90 degrees were measured to analyze the dynamical changes of the LC molecular alignments after the electric field composed of a small number of altemating pulsed were removed with the use of an image-processing technology and the single or double block pulse method. The details of the experimental results were studied. Some new physical phenomena were found. 1. The changes of the LC molecules continue aligning for a fes milliseconds after the electric field is removed. This is called the lagging changes of the LC molecular alignments. 2. The time required to show the maximum intensities of the conoscopic figures after the electric field is applied is almost the same regardless of the applied manners. It is considered by the numerical calculation derived from a modified Voigt model in the viscoelastic theory combining the theory of an altemating current circuit that the floating capacity, the viscosity resistance and electric deformations of the LC molecules have effects upon the lagging changes. 3. The changing rate of deformations of the LC alignments is estimated by the Voigt model with changing the ratio of the coefficient of viscisity to the elastic modulus as a function of the distance from the film surfaces instead of considering the effect of the anchoring force. We can represent the equation of the changing rate exponentially. 4. The method of computer simulations to obtain the conoscopic figures was developed on the basis of crystal optics.

测量扭曲列液液晶体（LC）膜中扭曲角度的动力学变化和90度的扭曲角膜中的干扰强度，以分析由少量高度脉冲组成后，通过少量的高度脉冲来分析LC分子比对的动力学变化，并通过少量的高度脉冲进行了图像处理和双群脉冲方法。研究了实验结果的细节。发现了一些新的物理现象。 1。在去除电场后，LC分子的变化继续对齐FES毫秒。这称为LC分子比对的滞后变化。 2。在施加电场后显示最大强度的最大强度所需的时间几乎是相同的。它是由从修改的VOIGT模型中得出的数值计算在粘弹性理论中得出的，结合了高度电流电路的理论，即浮动能力，LC分子的粘度抗性和电变形对滞后变化具有影响。 3。通过VOIGT模型估算了LC比对变形的变化速率，随着粘度系数与弹性模量的系数的比例，这是距膜表面距离的函数的函数，而不是考虑锚定力的效果。我们可以按指数级表示速率的方程式。 4。根据晶体光学元件开发了计算机仿真的方法获得综合图。