We have been developing a thermally writable and electrically erasable rewritable medium utilizing guest-host (G-H) polymer dispersed liquid crystal (PDLC) films. The PDLC rewritable medium can display bistable images using the memory effect of smectic A liquid crystal (SmA LC). It uses the difference in scattering of the SmALC layer with homeotropic and focal conic alignments. Dichroic dyes are added into SmA LC to make a G-H system with improved contrast.