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Biometric sensing

  • US 9,798,917 B2
  • Filed: 11/21/2016
  • Issued: 10/24/2017
  • Est. Priority Date: 04/10/2012
  • Status: Active Grant
First Claim
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1. A method of tracking a finger on a dual grid sensor comprising a plurality of intersecting grid lines configured and arranged to define a matrix of pixel clusters, wherein adjacent pixels within each pixel cluster are more closely spaced than adjacent pixels in different pixel clusters, said method comprising:

  • (a) activating all pixels in a cluster simultaneously and taking a single measurement to determine if the cluster is covered by apportion of a finger;

    (b) repeating step (a) for all clusters;

    (c) repeating step (a) and then step (b) at at least two different instances;

    (d) from the measurements taken in steps (a) through (c), determining if the absolute position of the finger has changed between the at least two instances;

    (e) outputting a new absolute finger position in response to a determination in step (d) that the finger has changed absolute position;

    (f) taking a measurement with each pixel of at least one cluster covered by the finger at at least two different instances in response to a determination in step (d) that the finger has not changed absolute position; and

    (g) identifying a fine movement of the finger based on the measurements taken in step (f).

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