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Biometric sensing

  • US 10,114,497 B2
  • Filed: 04/02/2014
  • Issued: 10/30/2018
  • Est. Priority Date: 04/10/2012
  • Status: Active Grant
First Claim
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1. An impedance sensor configured to operate in a dual resolution processing mode for processing touch input at a touch screen device, the sensor comprising a processing unit configured to:

  • determine, in a low resolution mode, whether an object creating the touch input has changed its position on the touch screen device;

    in response to determining in the low resolution mode that the object has changed its position on the touch screen device, output the position of the object determined in the low resolution mode;

    in response to determining in the low resolution mode that the object has not changed its position on the touch screen device, compute a coarse position of the object and switch from the low resolution mode to a high resolution modecompute, in the high resolution mode, a fine position difference of the object relative to the coarse position; and

    output the coarse position of the object adjusted by the fine position difference.

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