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Touch sensor system to detect multiple touch events

  • US 6,856,259 B1
  • Filed: 02/06/2004
  • Issued: 02/15/2005
  • Est. Priority Date: 02/06/2004
  • Status: Expired due to Term
First Claim
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1. A method for identifying locations of two or more touch inputs to a sensor substrate in a touchscreen system wherein the touch inputs overlap in time, the substrate having an X axis comprising X coordinates and a Y axis comprising Y coordinates, comprising the steps of:

  • (a) repeatedly measuring signals indicative of the locations of the two or more touch inputs, the locations having X and Y coordinates and the signals having associated X and Y magnitudes;

    (b) for each X coordinate, storing the associated X magnitude measured for each repeated measurement as elements in an X object;

    (c) for each Y coordinate, storing the associated Y magnitude measured for each repeated measurement as elements in a Y object;

    (d) for possible pairings of X and Y coordinates, comparing elements of associated X objects with corresponding elements of associated Y objects; and

    (e) selecting pairings of X and Y coordinates corresponding to locations of actual touch inputs based on the comparison of step (d).

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