Driving voltage properties sensitive to microscale liquid crystal orientation pattern in twisted nematic liquid crystal cells

摘要

We investigated the micropattern-sensitive driving voltage properties of twisted nematic liquid crystal (LC) cells and found that the threshold voltage for inducing the Freedericksz transition strongly depends on the micropatterned LC molecular orientation state. We discuss the effects of various cell parameters such as the period of the micropattern Lambda, the LC layer thickness d, and the twist angle Phi on the threshold voltage. By a computer simulation of the LC molecular orientation, we found that the threshold voltage V-th varies in response to the deformation factor Delta. (= d(2)/Lambda(2) + Phi(2)/Pi(2)) of the spatially distributed LC molecular orientation. We confirm that V-th(2) is proportional to 1 - Delta from both theoretical and experimental standpoints. (C) 2016 The Japan Society of Applied Physics