Fingerprint sensing device and recognition system having predetermined electrode activation

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5325442
SERIAL NO

08020883

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Abstract

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A Fingerprint sensing device and a recognition system having a row/column array of sense elements which are coupled to a drive circuit and a sense circuit by sets of row and column conductors, respectively. The sense elements are actively addressable by the drive circuit. Each sense element contains a sense electrode and a switching device (e.g., a TFT) for active addressing of that sense electrode. The sense electrodes of the sense elements are covered by insulating material adapted for receiving, directly thereon or on respective conductive pads overlying the sense electrodes, a finger. Capacitances resulting from individual finger surface portions in combination with sense electrodes are sensed by the sense circuit by applying a potential to the sense electrodes and measuring charging characteristics. In the fingerprint recognition system, an output from the sensing circuit is analyzed and characteristical data is compared with stored characteristical data for identification and verification purposes.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
U.S. PHILIPS CORPORATIONNEW YORK, NY981

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Knapp, Alan G Crawley, GB2 56 2136

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (3)
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* Cited By Examiner

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Patent Info (Count) # Cites Year
 
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