Novel cell parameter determination of a twisted-nematic liquid crystal display

• 来源期刊: 中国物理B（英文版）
• 关键词: liquid crystal display twist angle optical retardation rubbing direction
• 年，卷（期）: 2008,（3）
• 页码范围: 950-953
• 页数: 4页
• 语种: 英文

摘要

In this paper a novel method is proposed to determine the cell parameters including the twist angle, optic retardation and rubbing direction of twisted-nematic liquid crystal displays (TNLCD) by rotating the TNLCD. It is a single-wavelength method. Because using subtraction equation of transmittance as curve fitting equation, the influence of the light from environment and the absorption by polarizer, the sample of TNLCD and analyser on the transmittance is eliminated. Accurate results can also be obtained in imperfect darkness. By large numbers of experiments, we found that not only the experimental setup is quite simple and can be easily adopted to be carried out, but also the results are accurate.