Optical Writing Effects after the LC cell fabricate in using a Photoalignment Film

Abstract

An optical writing was demonstrated in homogeneous Liquid crystal (LC) cells using poly (vinyl cinnamate) (PVCi) and rubbed PVA film coated substrates. The cell is irradiated with the linearly polarized UV light at 45° to the homogeneous director toward the PVCi substrate under the voltage application. We measured the twist angle with Stokes Parameter method (SPM). The twist angle in the area exposed with the UV light under the voltage application is larger than that under the no voltage application. Moreover, non-uniform alignment is observed in the area with the optical writing under the voltage application.