A security enhancement for laptop computers comprises the use of a moving visible area and an obscured area for the laptop screen. The visible area may be defined by the user to comprise a single word, a single line, or a plurality of lines of data. The obscured area may comprise all remaining space...http://www.google.com.au/patents/US5801697?utm_source=gb-gplus-sharePatent US5801697 - Method and apparatus for preventing unintentional perusal of computer display information 
