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DETECTING THE LOCATION OF AN OBJECT ON A TOUCH SURCACE

  • US 20110102374A1
  • Filed: 06/22/2009
  • Published: 05/05/2011
  • Est. Priority Date: 06/23/2008
  • Status: Active Grant
First Claim
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1. An apparatus for detecting a location of at least one object on a touch surface, said apparatus comprising:

  • a panel defining the touch surface and an opposite surface;

    an input scanner arrangement adapted to introduce at least two beams of radiation into the panel for propagation by internal reflection between the touch surface and the opposite surface, and to sweep the beams along the touch surface across a sensing area of the panel;

    an output scanner arrangement which is synchronized with the input scanner arrangement so as to receive the beams from said input scanner arrangement while they are swept across the sensing area and to direct the beams onto at least one radiation detector;

    wherein said input and output scanner arrangements are configured to introduce and receive each beam on opposite ends of said sensing area;

    said apparatus further comprising a data processor connected to said at least one radiation detector and configured to identify said location based on an attenuation of said beams caused by the object touching the touch surface within said sensing area.

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