title: Full-field characterization of a twisted nematic liquid-crystal device using equivalence theorem of a unitary optical system.
abstract: 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 was measured by using a polarizer-sample-analyzer imaging polarimeter so that the untwisted phase retardation, cell thickness, and twisted angle of a TNLCD can be directly calculated through the explicit expressions as a function of the characteristic parameters. The measured results agree well with the given values. This method can be implemented for characterization of a TNLCD in the manufacturing process.
authors.affiliation: Graduate Institute of Electro-Optical Engineering, Chang Gung University, Taoyuan 333, Taiwan.
authors.forename: Chih-Jen
authors.initials: CJ
authors.lastname: Yu
authors.forename: Yao-Teng
authors.initials: YT
authors.lastname: Tseng
authors.forename: Kuei-Chu
authors.initials: KC
authors.lastname: Hsu
authors.forename: Chien
authors.initials: C
authors.lastname: Chou