Electro-optical Response of Liquid Crystal Displays with Alignment Layers of a Cellulose Derivative

Abstract

Low voltage operation and fast response of liquid crystal displays (LCDs) can be achieved by using a hybrid twisted nematic (HTN) cell, which is fabricated by applying the conventional twisted nematic (TN) cell. Unfortunately, the devices exhibit a narrow viewing-angle in the same order as that of TN. It has been reported that an alignment layer made of hydroxyl propyl cellulose (HPC) results in specific orientation; the director of the LC can be parallel to the substrate surface and random in the plane without any defects. The HTN cells with HPC as an alignment layer afford wide-viewing-angle as well as low voltage operation and fast electro-optical response.