Optical Modulation Characteristics and Applications of Liquid Crystal Televisions

摘要

One of the most critical components in optical information processing systems isthe spatial light modulator (SLM), which typically limits both system speed and space-bandwidth. Cost has been a major drawback for commercial applications. This report covers the improving SPL, the liquid crystal television (LCTV). Two LCTVs were selected for test measurements, The SEIKO LVD202 pocket color LCTV and the Epson Crystal Image video projector. Phase and amplitude modulation were checked with the LVD202 achieving a visibility of 0.94 in an amplitude modulating mode (AMM) and modulated in excess of 360 degrees of phase. The Epson LCTV achieved a visibility of 0.96 in AMM and modulated 336 degrees of phase. Two phase-mostly joint transform optical correlator constructed with two Seiko LCTVs performed as well as a similar Amplitude modulating (AM) JTC,with a much higher light efficiency. The Epson LCTV served as a phase-only input to a Vandderlugt optical correlator with results similar to traditional amplitude input correlator. This correlator also proved to be more light efficient than AM architecture. Report discusses experiment results and possible future research directions.