| Summary: | 碩士 === 逢甲大學 === 光電研究所 === 97 === The parameters of liquid crystal displays (LCDs), such as cell gap, twisted angle, and pretilt angle, greatly affect the brightness, contrast, and respond time of LCDs. These parameters could be accurately determined by polarimetry because LC layer is the only birefringent film in a LCD. This study proposes a muti-wavelength Mueller matrix polarimeter, using the dual-rotating-retarder technique, for measuring the LCD parameters. The proposed method provides several benefits over other polarimetric and interferometric methods: the unambiguous range of phase retardation is extended, more cell parameters are derived from the recorded intensity variation, and the systematic error can be removed by a self-calibration step. Three different types of LC cells were investigated and the results are presented in this study.
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