A thermochromic liquid crystal display comprises a layer of short pitch cholesteric liquid crystal material between two walls. An absorber covers the back of the rear wall. At least one wall is surface profiled with a fine grating to align the liquid crystal material. Typically the grating pitch is 0.05...http://www.google.fr/patents/US4834500?utm_source=gb-gplus-shareBrevet US4834500 - Thermochromic liquid crystal displays
