Brightness-Enhanced Projection Display Using Reflection-Mode PDLC Light Valves : Light Scattering Properties of PDLC and Projection Optics Design

Abstract

A photoactivated light valve is most powerful device for large-screen projection displays with a high brightness and a high resolution. Especially, the light valve using a polymer dispersed liquid crystal (PDLC) has an excellent characteristics for the projection displays, such as a high optical efficiency, a high resolution and a fast response. In this paper, we report the light scattering properties of PDLC, the optics design for a projection display, and a full-color video projection display based on three light valves, which has a high brightness over 1500 ANSI lumens and high extinction ratio of 80 : 1.