Light efficiency of the fringe-field switching mode depending on magnitude of dielectric anisotropy of liquid crystal associated with cell gap and rubbing angle

Abstract

The light efficiency of the homogeneously aligned liquid crystal (LC) mode driven by fringe electric fields depends on the magnitude of the dielectric anisotropy when using a LC with positive dielectric anisotropy. However, this dependency is not observed when using a LC with negative dielectric anisotropy. This difference is mainly associated with the molecular reorientation especially in the tilt angle of the LC between the edges and the centers of the pixel electrodes in the voltage-on state. This paper explores the dependence of the light efficiency of the device on the magnitude of the dielectric anisotropy of the LC for both types of the LCs as functions of other cell parameters such as the rubbing angle and the cell gap.