Multi-biometric finger sensor including electric field sensing pixels and associated methods
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United States of America Patent
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Apr 15, 2008
Grant Date -
Apr 28, 2005
app pub date -
Sep 3, 2004
filing date -
Sep 5, 2003
priority date (Note) -
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Abstract
A multi-biometric finger sensor includes a plurality of electric field fingerprint sensing pixels on an integrated circuit substrate for sensing an image of the user's finger, and at least one other finger biometric characteristic sensor on the integrated circuit substrate for sensing a finger biometric characteristic different than the image of the user's finger. Each of the electric field fingerprint sensing pixels may include an electric field sensing electrode, a guard shield surrounding the electric field sensing electrode, and an amplifier connected between the electric field sensing electrode and the guard shield. The sensor may also include a finger drive electrode adjacent the plurality of electric field sensing pixels, and a processor connected to the electric field fingerprint sensing pixels and the at least one other finger biometric characteristic sensor.
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