RESPONSE-TIME MEASUREMENTS OF LIQUID-CRYSTAL DISPERSED IN POLYESTER RESIN FILM

New material consisting of nematic liquid crystal droplets from 2-30-mu-m in radius in a crosslinked UV-cured polyester resin binder was prepared. Micrographs of the samples were taken in the optical microscope with cross-polaroids. Reorientation of the droplets by application and removal of an electric field is discussed. Electrooptic properties of the material were measured using polarized light from a helium-neon laser. Transmittance and response time vs. voltage applied with driving frequency 2 kHz were detected on the oscilloscope and photographed. The response times were: rise time-tau-on shorter than 20 ms at applied voltage higher than 50 V, and decay time-tau-off = 80 ms. They are a promising feature for this material for a display application.