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Multi-sided card having a resistive fingerprint imaging array

  • US 8,699,762 B2
  • Filed: 05/13/2011
  • Issued: 04/15/2014
  • Est. Priority Date: 05/13/2011
  • Status: Active Grant
First Claim
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1. A multi-sided card having a resistive fingerprint array, comprising:

  • a first side having a first fingerprint scanning device;

    a second side having a second fingerprint scanning device, the first fingerprint scanning device and the second fingerprint scanning device each comprising;

    a set of imaging pixel electrodes for creating a fingerprint scanning surface;

    a voltage source coupled to the set of imaging pixel electrodes for supplying an initial voltage;

    a meter coupled to the set of imaging pixel electrodes for taking an electrical measurement across a first imaging pixel electrode and a second imaging pixel electrode of the set of imaging pixel; and

    a scanning area;

    wherein each of the first scanning device and the second scanning device is configured to;

    detect a location of the scanning area unsearched for a finger positioned thereon;

    determine a median point of the unsearched area;

    search the unsearched area for a finger positioned thereon, the search beginning at the median point;

    detect the finger positioned on the scanning area based on the search, the detecting comprising;

    applying an initial voltage by the voltage source to a first imaging pixel electrode of the set of imaging pixel electrodes, the first imaging pixel electrode being in contact with a first portion of the finger,determine an electrical measurement across the first imaging pixel electrode and a second imaging pixel electrode of the set of imaging pixel electrodes in response to the applying of the initial voltage, the second imaging pixel electrode being in contact with a second portion of the finger,determine a first location of the finger on the scanning area based on the electrical measurement,determine a second location of the scanning area where the finger is not positioned, andscan a fingerprint from the finger at the first location without scanning the second location.

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