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Finger sensing device including differential measurement circuitry and related methods

  • US 8,888,004 B2
  • Filed: 10/07/2011
  • Issued: 11/18/2014
  • Est. Priority Date: 10/08/2010
  • Status: Active Grant
First Claim
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1. A finger sensing device comprising:

  • an array of finger sensing pixels to receive a user'"'"'s finger adjacent thereto, each finger sensing pixel comprising a finger sensing electrode;

    a finger drive electrode configured to cooperate with said array of finger sensing pixels to couple a drive signal through the user'"'"'s finger; and

    differential pixel measurement circuitry coupled to said array of finger sensing pixels and configured to generate a plurality of interpixel difference measurements for adjacent pairs of said finger sensing pixels.

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