Dependence of threshold behavior upon surface distribution of polymer chains in a twisted nematic liquid crystal.
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.
Gwag
Jin Seog
JS
Department of Electronics Engineering, Pusan National University, Pusan 609-735, Korea.
Lee
Gi-Dong
GD
Yoon
Tae-Hoon
TH
Kim
Jae Chang
JC