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    • 53. 发明授权
    • Method of determining cell thickness and twist angle parameters of
liquid crystal cell
    • 确定液晶盒的细胞厚度和扭转角参数的方法
    • US5966195A
    • 1999-10-12
    • US974994
    • 1997-11-20
    • Susumu SatoYing ZhouZhan HeYoshihiro Togashi
    • Susumu SatoYing ZhouZhan HeYoshihiro Togashi
    • G01B11/06G01J4/00G01N21/21G02B11/06G02F1/13G02F1/1337
    • G01N21/21G01B11/0641
    • A method of determining a parameter of a liquid crystal cell is provided in which parameters, such as the thickness of the liquid crystal layer and the angle of the twist of liquid crystal molecule orientation in the liquid crystal cell, are accurately determined in a short time with a simple apparatus. Light from a light source 1 is transmitted through a polarizing plate 2 and incident to a liquid crystal cell 3. The light is transmitted by a polarizing plate 4 and the intensity of the transmitted light is measured by a photodetector 6. Then, the outputs of the photodetector 6 for the following cases are measured: when the polarization direction of the polarizing plate 4 is set (1) in the direction of the X axis, (2) in the direction of Y axis and (3) at 45 degrees to the X and Y axes and (4) when, with the polarization direction of the polarizing plate 4 being at 45 degrees to the X and Y axes, a quarter wavelength plate 5 is inserted between the polarizing plate 4 and the liquid crystal cell 3 so that its axial direction is tilted at 45 degrees to the polarization direction of the polarizing plate 4. Stokes parameters are obtained from the measurement values, and the thickness of the liquid crystal layer and the angle of twist of liquid crystal molecule orientation are calculated from the measured Stokes parameters.
    • 提供一种确定液晶单元的参数的方法,其中在短时间内精确地确定诸如液晶层的厚度和液晶单元中液晶分子取向的扭转角度的参数 用简单的装置。 来自光源1的光通过偏振板2透射并入射到液晶单元3.光被偏振板4透射,透射光的强度由光电检测器6测量。然后,输出 测量以下情况的光检测器6:当偏振板4的偏振方向在X轴方向上被设定为(1)时,(2)沿Y轴方向和(3)相对于 X轴和Y轴以及(4)当偏振板4的偏振方向与X轴和Y轴成45度时,四分之一波片5被插入到偏振板4和液晶单元3之间, 其轴向方向与偏光板4的偏振方向倾斜45度。从测量值获得斯托克斯参数,计算液晶层的厚度和液晶分子取向的扭转角f 测量斯托克斯参数。