Role of the elastic constants of a liquid crystal with positive dielectric anisotropy in the electro-optic characteristics of fringe-field switching mode

Abstract

2015): Role of the elastic constants of a liquid crystal with positive dielectric anisotropy in the electro-optic characteristics of fringe-field switching mode, Liquid Crystals, We investigated how the electro-optic characteristics of the fringe-field switching (FFS) liquid crystal (LC) mode are affected by elastic constants of LCs. Unlike conventional liquid crystal (LC) devices, in which mainly the dielectric torque determines reorientation of LC, the field-induced LC reorientation in the fringe-field switching (FFS) mode is controlled first by dielectric torque and then by pure elastic torque between LCs so that the transmittance oscillates along the electrode positions. We find that elastic constants of the LC play an important role on the field-induced dynamics of the LC molecules such that the higher the splay constant is, the higher the light efficiency becomes, which is a unique characteristic of the FFS mode. The results present an important design of physical properties of LC to enhance better transmittance in the FFS mode.

64‐1: Invited Paper: XtraFast: New LC Mixture Developments for Gaming Application

“…For Keff in FFS and IPS, the twist elastic constant (K22) has been mainly used. It was found that there is a close relation of the twist elastic constant (K22) and the splay elastic constant (K11) and that K22 can be approximated as about half of K11 [4] [5]. A reasonable correlation of γ1/K11 and response time is given in case of FFStype LCDs On the panel structure side, to achieve very fast response times, a reduction in d is absolutely necessary.…”