Liquid crystal display devices having undercoat and overcoat made of TiO2-SiO2 composite material

摘要

A liquid crystal display device having TiO2-SiO2 composite layers used as undercoat and overcoat is provided. The TiO2-SiO2 composite layers serving as the undercoat and overcoat of transparent conductive electrodes are formed by a low temperature ion-assisted electron gun evaporation or sputtering process, wherein the TiO2-SiO2 composite materials can also be used as hard layers to protect the surfaces of transparent plastic substrates. These TiO2-SiO2 composite layers have superior insulation, a high degree of hardness and smoothness. Consequently, the advantages of the TiO2-SiO2 composite layer are as follows: (1) the out diffusion of impurities (sodium ions) can be prevented from soda lime glass into liquid crystal to destroy the property of the liquid crystal; (2) short circuit caused by impurities having the same size as the gap between the electrodes can also be prevented; (3) the TiO2-SiO2 layer can be used as a hard layer to protect the surface of the plastic substrate from scratching damage; and (4) the TiO2-SiO2 layer can be used as an isolating layer to prevent the plastic substrate from releasing water and gas stored thereinside and causing poor adhesion to the transparent conductive layer formed thereon.