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一种液晶透镜盒间隙的测试方法*
A measurement method of cell gap for liquid crystal lens
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摘要: 针对当前液晶透镜盒间隙测试存在的难题，文中提出采用线偏振干涉法测试方法，采用光强均匀分布的单色光入射，检偏器的偏光轴方向与起偏器的偏光轴垂直或者平行，液晶透镜的液晶取向层的摩擦方向与起偏器偏振轴夹角为45?，此时干涉条纹亮暗差别最明显。利用液晶透镜中心保持预倾角不变的透过率以及其他位置透过率最大值来计算液晶透镜的盒间隙，该方法简单、可靠，因采用光学手段测试，其精确度相对较高。Abstract: There was a problem in current cell gap measurement of liquid crystal (LC) lens. A method was proposed by adopting interference of linearly polarized light in this paper. It was claimed that the incident light was monochromatic light with a uniform distribution of light intensity. The polarization axis of the analyzer was perpendicular or parallel to the polarization axis of polarizer. The difference between light and dark interference fringes was the biggest when the angle was equal to 45?between the rubbing direction of alignment layer in the LC lens and the polarization axis of polarizer. The cell gap of LC lens can be calculated by the transmittance of LC lens center and the max transmittance of its other locations. The tilt angle was equal to the pre-tilt angle of LC at the LC lens center. This method was simple and reliable. Its accuracy is relatively high due to the use of optical interference principle.
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