Patent ID: 8289299

Claim:
A touch display comprising: a screen for a user to touch and view an image on or through; a plurality of light sources at one or more edges in front of said screen, said plurality of light sources directing light across the surface of said screen; at least two cameras located at the periphery of said screen, said at least two cameras located so as not to receive direct light from said plurality of light sources, each of said at least two cameras configured to generate an output by imaging said surface in front of said screen, said output including a mirrored image generated from each of said at least two cameras detecting light reflected from the surface of said screen; and a processor configured to: generate processed outputs by processing said outputs to detect a level of reflected light and a level of light from said minor image; and employ triangulation techniques using said processed outputs to determine the presence of an object proximate to said screen and a location of said object.