$Psi_{pp}$, '/> Transmitted Ellipsometry Method for Extracting Physical Parameters of TN/VA/Inverse-TN Liquid Crystal Cells
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Transmitted Ellipsometry Method for Extracting Physical Parameters of TN/VA/Inverse-TN Liquid Crystal Cells

机译:透射椭偏法提取TN / VA /反TN液晶盒的物理参数

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摘要

A transmitted ellipsometry method is proposed for extracting the ellipsometric parameters ($Psi_{pp}$, $Psi_{ps}$, $Psi_{sp}$ , $Delta_{pp}$, $Delta_{ps}$ and $Delta_{sp}$) of twisted nematic (TN), vertical alignment (VA), and inverse-TN (ITN) liquid crystal (LC) cells from the output Stokes parameters corresponding to five input polarized lights. The validity of the proposed approach is confirmed by comparing the experimental values of $Psi_{pp}$, $Psi_{ps}$, $Psi_{sp}$, $Delta_{pp}$, $Delta_{ps}$ , and $Delta_{sp}$ with the simulated values obtained via a Genetic Algorithm curve-fitting approach. In experiments, the cell gap, pretilt angle, twist angle, and rubbing direction of TNLC and the cell gap, pretilt angle, and rubbing direction of VALC are extracted successfully. The sensitivity analysis results reveal that the ellipsometric parameters of the TNLC cell are sensitive to the cell gap, pretilt angle, twist angle and rubbing direction. However, those of the VALC and ITNLC cells are sensitive only to the cell gap, pretilt angle and rubbing direction. Overall, the results presented in this paper show that the proposed transmitted ellipsometry method provides a straightf- rward and accurate means of determining the ellipsometric and physical parameters of TN, VA, and inverse-TN LC cells.
机译:提出了一种透射椭偏法,用于提取椭偏参数( $ Psi_ {pp} $ $ Psi_ {ps} $ $ Psi_ {sp} $ $ Delta_ {pp} $ $ Delta_ {ps} $ $ Delta_ {sp} $ )向列(TN),垂直排列(VA)和反向TN(ITN)液晶(LC)单元来自对应于五个输入偏振光的输出斯托克斯参数。通过比较 $ Psi_ {pp} $ $ Psi_ {ps} $ $ Psi_ {sp} $ $ Delta_ {pp} $ $ Delta_ {ps} $ $ Delta_ {sp} $ 通过遗传算法曲线拟合方法获得的模拟值。在实验中,成功地提取了TNLC的单元间隙,预倾斜角,扭曲角和摩擦方向,以及VALC的单元间隙,预倾斜角和摩擦方向。灵敏度分析结果表明,TNLC电池的椭偏参数对电池间隙,预倾斜角,扭曲角和摩擦方向敏感。但是,VALC和ITNLC电池的电池仅对电池间隙,预倾斜角和摩擦方向敏感。总体而言,本文提出的结果表明,所提出的透射椭圆偏振法提供了一种简单而又准确的方法来确定TN,VA和反TN LC单元的椭圆和物理参数。

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