A personal information display system is provided with a portable information display device for reading information to be used from a storage medium, a communication network for transmission of information, input/output apparatus for input/output of information, an input/output control apparatus...http://www.google.com.tw/patents/US5721942?utm_source=gb-gplus-share專利 US5721942 - Personal information display system for serving large capacities of general information to user-designated stations at user-designated times 
