Title:
【発明の名称】指紋検出装置
Document Type and Number:
Japanese Patent JP3007714
Kind Code:
B2
Abstract:
To obtain fingerprint pattern information the capacitances between individual sense elements in an array and respective finger surface portions overlying the elements are sensed to provide an electronic representation of the variation of the capacitances as determined by the spacing from the array of the ridge and trough pattern of the fingerprint. A fingerprint sensing device comprises a row/column array of actively addressed sense elements (12) connected to sets of row and column conductors (18,20) and comprising sense electrodes (14) covered by insulating material (32) over the surface (34) of which a finger (37) is placed, either directly thereon or on respective conductive pads overlying the sense electrodes. The capacitance at each sense element is sensed for example by applying a potential to the sense electrode and measuring charging characteristics through a sensing circuit (24). Each sense element includes a switching device (16), e.g. a TFT for active addressing. In a fingerprint recognition system the sensing device output is analysed and characterised data is compared with stored data for identification or verification purposes.
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Inventors:
Alan George Knap
Application Number:
JP13868591A
Publication Date:
February 07, 2000
Filing Date:
May 15, 1991
Export Citation:
Assignee:
Konin Krekka Philips Electronics NV
International Classes:
G01B7/28; G01B7/004; G01B7/287; G01B7/34; G06K9/00; G11C11/24; (IPC1-7): G01B7/28; G01B7/34
Domestic Patent References:
| JP1285801A | ||||
| JP58211241A | ||||
| JP616729A |
Other References:
【文献】米国特許4577345(US,A)
【文献】米国特許4353056(US,A)
【文献】米国特許4353056(US,A)
Attorney, Agent or Firm:
Akihide Sugimura (5 outside)