Analytical solution of anchoring energy on liquid crystal cells with high pretilt angles

• Main Authors: Wei-han Chen, 陳韋翰
• Other Authors: Bau-jy Liang
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/18854355731637238839

碩士 === 逢甲大學 === 電機工程所 === 99 === This study proposed a simple, quick, and convenient method to calculate analytical solution of anchoring energy of liquid crystal (LC) with high-pretilt angle. In literature, we will detail discuss various methods to calculate anchoring energy and compare the process with different range of pretilt angles and limitation of available. This study takes advantage of simulation software Dimos (Wintek support) to obtain the numerical solution of voltage-retardation (V-R) of LC cells with Rapini-Popular model as surface anchoring model. Compared our analytical solution with numerical solution of V-R, we can find out the effective coefficient of anchoring energy range. We also propose the method of linear relation between V-R and calculate the analytical solution of anchoring energy. According to the analysis, we calculate the error bar of analytical solution from numerical solution. Finally, we demonstrate the analytical solution of anchoring energy coefficient by measuring V-R utilizing the samples with different pretilt angles. We successfully calculate the analytical solution in the range of pretilt angle from 1°~ 44° and anchoring energy coefficient from 10-3~10-6 in homeotropic LC cells. We also verify the analytical solution in three samples with different anchoring energy and mark the error bar of measurement.