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28 February 2012Two-dimensional cell parameters measurement of a twisted nematic liquid crystal device by using imaging ellipsometer
Based on the equivalence theorem of a unitary optical system. We proposed an analytical approach to characterize the
cell parameters of a twisted nematic liquid crystal device (TNLCD) with full field resolution. The spatial distribution of
three characteristic parameters of a TNLCD were measured by using a polarizer-sample-analyzer imaging ellipsometer,
thus the untwisted phase retardation, cell thickness and twisted angle of a TNLCD can be directly calculated through the
explicit expressions as a function of its characteristic parameters. The measured results are very close to the design
values provided by TNLCD manufacture. This method shows that both the system setup and parameters calculating
process are quite simple. It would be more helpful to characterize a TNLCD in the manufacturing process.
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Chih-Jen Yu, Yao-Teng Tseng, Kuei-Chu Hsu, Chien Chou, "Two-dimensional cell parameters measurement of a twisted nematic liquid crystal device by using imaging ellipsometer," Proc. SPIE 8255, Physics and Simulation of Optoelectronic Devices XX, 82551T (28 February 2012);