An LCD has both active and passive display areas. The active areas are presented by selective energization of dichroic liquid crystal, and the passive areas are created by a mask. The LCD cell includes a sealed cavity containing the dichroic liquid crystal which has an area substantially less than the...http://www.google.fr/patents/US5130827?utm_source=gb-gplus-shareBrevet US5130827 - Display cell having active and passive areas
