High-frame-rate liquid crystal phase modulator for augmented reality displays

摘要

We optimise a new liquid crystal mixture with wide nematic range, high birefringence (n), high resistivity, moderate dielectric anisotropy (epsilon) and relatively low rotational viscosity for augmented reality display applications. High n and large epsilon allow a thin cell gap (d approximate to 1.5 m) to be employed in a reflective liquid-crystal-on-silicon (LCoS) device to achieve 2 phase change at 5 V and 2.87ms average phase-to-phase response time at 40 degrees C without complicated overdrive circuitry. Such a fast response time enables an LCoS panel to achieve 240Hz frame rate for field sequential colour operation to avoid image flickering.