title: Dependence of threshold behavior upon surface distribution of polymer chains in a twisted nematic liquid crystal.
abstract: On the basis of a general Rapini and Papoular equation and a unified surface anchoring energy theory, dependence of the threshold behavior of the liquid crystal director upon the statistical distribution of polyimide chains is theoretically investigated for a twisted nematic liquid crystal cell. We assumed that the anisotropy distribution of polyimide chains induced by the rubbing can be dominated by a Gaussian distribution around the rubbing direction. Our results show that the threshold behavior of a twisted nematic liquid crystal is affected strongly by the surface distribution of polymer chains.
authors.affiliation: Department of Electronics Engineering, Pusan National University, Pusan 609-735, Korea.
authors.forename: Jin Seog
authors.initials: JS
authors.lastname: Gwag
authors.forename: Gi-Dong
authors.initials: GD
authors.lastname: Lee
authors.forename: Tae-Hoon
authors.initials: TH
authors.lastname: Yoon
authors.forename: Jae Chang
authors.initials: JC
authors.lastname: Kim