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Systems and Methods for Resolving Multitouch Scenarios for Optical Touchscreens

  • US 20090219256A1
  • Filed: 02/10/2009
  • Published: 09/03/2009
  • Est. Priority Date: 02/11/2008
  • Status: Abandoned Application
First Claim
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1. A method of determining multiple touch points, the method comprising:

  • detecting a first shadow resulting from an interruption of light at a first point in a touch area using a first detector;

    changing light traveling in the touch area so that a length of at least one shadow changes;

    based on the length of the shadow as changed, calculating a distance from the first point to the first detector; and

    using the distance as calculated to validate a potential touch position coordinate for the first point.

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