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Touch screen signal processing

  • US 7,629,967 B2
  • Filed: 01/11/2005
  • Issued: 12/08/2009
  • Est. Priority Date: 02/14/2003
  • Status: Active Grant
First Claim
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1. A touch detection method comprising:

  • directing light from a plurality of sources across a surface of a screen, the screen configured for a user to touch and view an image on or through;

    imaging (i) light traveling in a space above the front surface of said screen and (ii) a mirror image comprising light reflected from the surface of said screen using at least two cameras located so as not to receive direct light from the plurality of sources;

    processing outputs of said cameras to detect the level of reflected light from an object in the space above the front surface of said screen and the level of light from said mirror image; and

    determining a location of said object from the processed outputs of said cameras based on triangulation techniques.

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