Abstract
Scattering light outputted from polymer dispersed LC layer is reflected by the boundary surface of the glass substrate in contact with air, so as to return to PDLC layer. Thereby this return light results in rise of luminance of a black display portion, so contrast ratio lowers. Besides we think that the return light enters the layer of semiconductor of thin film transistor so photo conductor phenomenon occurs in case of using PDLC panels for Video Projection System. We suggested that the transeparent plate is optically coupled with an output side of the PDLC panel through the transparent body. The present paper describes the Optical Coupling(OC) technology enable to reduce the return light and lower photo conductor phenomenon.
