An input/output device is disclosed that includes an input-sensitive display screen and alphanumeric keys for entering characters. The input-sensitive display screen may be positioned proximate the alphanumeric keys and be capable of displaying graphical information and sensing user selection of the...http://www.google.es/patents/US7884804?utm_source=gb-gplus-sharePatente US7884804 - Keyboard with input-sensitive display device
