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Controller and method for controlling a capacitive touch screen or the like

  • US 9,727,159 B2
  • Filed: 01/03/2012
  • Issued: 08/08/2017
  • Est. Priority Date: 01/03/2012
  • Status: Expired due to Fees
First Claim
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1. A controller for a capacitive touch screen, comprising:

  • a touch resolve subsystem that in response to a trigger input measures a plurality of capacitance values using a plurality of input pins; and

    a processor that controls said touch resolve subsystem to acquire a baseline capacitance,to determine an interference map for each of a plurality of values of a parameter,wherein said interference map identifies an interference at each of said plurality of values of said parameter, and said values vary over an allowed range, and to select one of said plurality of values of said parameter based on said interference map in a calibration mode, and to acquire a frame comprising said plurality of capacitance values using said selected one of said plurality of values of said parameter in a normal operation mode,wherein said parameter comprises a number of scan pulses per scan line.

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