A head-up display (HUD)/head-down display (HDD) system capable of projecting multi-color images employs cholesteric liquid crystal elements, two-state liquid crystal devices, an image source, a beam splitter, and a combiner to, in sequence, generate HUD and HDD images. An LCD and cholesteric liquid crystal...http://www.google.com.au/patents/US4987410?utm_source=gb-gplus-sharePatent US4987410 - Multiple image forming apparatus
