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Fast multi-touch post processing

  • US 9,529,476 B2
  • Filed: 10/13/2015
  • Issued: 12/27/2016
  • Est. Priority Date: 07/12/2013
  • Status: Active Grant
First Claim
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1. A low-latency touch sensitive device, comprising:

  • first and second pluralities of conductors, arranged such that each of the paths of the conductors of the first plurality of conductors cross each of the paths of the conductors of the second plurality of conductors;

    at least one signal processor adapted to process signals present on each of the second plurality of conductors, and for each of the signals present on each of the second plurality of conductors to determine which signals represent touches, the at least one signal processor being adapted to convert a two-dimensional map representing signal strengths into usable touch events by applying;

    a field flattening procedure that subtracts an offset level to remove crosstalk between rows and columns and compensates for differences in amplitude between particular row/column combinations due to attenuation, thereby creating a field-flattened signal;

    a touch point detection procedure that computes coarse touch points by finding local maxima in the field-flattened signal;

    an interpolation procedure that computes fine touch points from the coarse touch points; and

    ,a frame matching procedure that matches calculated touch points to each other across frames.

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