A portable electronic device includes a display-input apparatus (108) for displaying alternate character sets, in correspondence with a selected mode of operation of the device. The display-input apparatus uses first and second cholesteric display layers (302, 304) to display the different character...http://www.google.com.au/patents/US7330178?utm_source=gb-gplus-sharePatent US7330178 - Display-input apparatus for a multi-configuration portable device
