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Development of a software for analyzing thin film flow of liquid crystals for the purpose of high efficiency of liwuid crystal display manufactureing

开发液晶薄膜流动分析软件，以提高液晶显示器的制造效率

基本信息

批准号：
11650195
负责人：
CHONO Shigemi
金额：
$ 2.3万
依托单位：
Kochi University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

Injection process is one of the most important processes for manufacturing liquid crystal displays (LCD). The purpose of this research project is to develop a widely usedsoftware which can predict numerically the injection process. Such the software makes possible to reduce greatly the injection time for LCD with arbitrary size and shape, leading to high productivity and to a decrease in cost.The Leslie Ericksen equation is selected as a constitutive equation for liquid crystalline flow, and the Hele Shaw approximation was made for both the equation of motion and the constitutive equation. Finite difference method was employed to discretize the governing differential equations. Liquid crystals have three kinds of viscosities depending on molecular orientation. We have measured the viscosities by using a rheometer under conditions that molecules were forced to orient to required directions by an external field. Surface tensions of liquid crystals were also measured. Vie did injection experiments and measured the injection time as well as a time series of free surface locations.We used the software to simulate injection of liquid crystals into liquid crystal cells under some typical computation conditions. As a result, the software could predict smooth flow of liquid crystals in the cells, and effects of injection hole size, a cell gap, and injection pressure on the injection time were clarified. It is also found that the injection time for a liquid crystal cell with two injection holes becomes short compared to that for a cell with single but twice area injection hole. However, the predictions did not agree with experiments. This stems from the fact that the cell gap during injection becomes smaller than the initial cell gap because of the pressure difference between in and out of the cell.

注入工艺是制造液晶显示器的重要工艺之一。本课题的目的是开发一个应用广泛的注射过程数值预测软件。该软件可大大缩短任意尺寸和形状液晶显示器的注射时间，提高生产率，降低成本。选择Leslie Ericksen方程作为液晶流动的本构方程，并对运动方程和本构方程进行Hele Shaw近似。采用有限差分法对控制微分方程进行离散。根据分子取向，液晶具有三种粘度。我们已经通过使用流变仪在通过外场迫使分子定向到所需方向的条件下测量了粘度。还测量了液晶的表面张力。Vie进行了注入实验，测量了注入时间和自由表面位置的时间序列，并利用该软件在一些典型的计算条件下模拟了液晶注入液晶盒的过程。结果表明，该软件可以预测液晶在盒内的平稳流动，并阐明了注射孔尺寸、盒间隙和注射压力对注射时间的影响。同时还发现，与具有单个但面积为两倍的注入孔的液晶盒相比，具有两个注入孔的液晶盒的注入时间变短。然而，这些预测与实验并不一致。这是由于注射期间的单元间隙由于单元内外之间的压力差而变得小于初始单元间隙。