Interferometer utilization in LC2002 spatial light modulator phase retardation and grayscale calibration

Abstract

The phase retardation response characterization of Spatial Light Modulator in twisted nematic liquid crystal display, by implementing interferometer technology, is presented. Two common interferometer types, He-Ne (X=632 nm) and white light interferometer, are used. The generalized interferometer configuration is intended for practical basis in calibrating Spatial Light Modulator in a much convenient way. Applying sets of grayscale levels in several grayscale patterns are intended to obtain SLM phase retardation characteristic on 632 nm and required accuracy around X/255, along with deeper linearity observation towards its behavior as liquid crystal display.