A display unit displaying an image and selection buttons on a display screen is provided, and a touch panel in which a desired position on the display screen can be specified is provided on the display unit. Furthermore, a coordinate detection unit and a button processing unit are provided. The coordinate...http://www.google.com.au/patents/US7555728?utm_source=gb-gplus-sharePatent US7555728 - Preventing unintentional selection of a touch panel button via gray out for a predetermined time
