A system for detecting contact on a display is provided. The system comprises a planar medium associated with the display and includes at least one edge facet and opposing surfaces. The system also includes one or more optical sources operatively coupled to the at least one edge facet for transmitting...http://www.google.co.uk/patents/US20090027357?utm_source=gb-gplus-sharePatent US20090027357 - SYSTEM AND METHOD OF DETECTING CONTACT ON A DISPLAY
