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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0020883 (1993-02-19) |
우선권정보 | GB-0011163 (1990-05-18) |
발명자 / 주소 |
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출원인 / 주소 |
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인용정보 | 피인용 횟수 : 339 인용 특허 : 0 |
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 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.
A fingerprint sensing device, comprising: an array of sense elements, each of which includes a sense electrode and a switching device coupled to one another, all of the sense electrodes of said sense elements being covered by dielectric material defining a sensing surface adapted to receive a finger
A fingerprint sensing device, comprising: an array of sense elements, each of which includes a sense electrode and a switching device coupled to one another, all of the sense electrodes of said sense elements being covered by dielectric material defining a sensing surface adapted to receive a finger having individual finger surface portions; drive means coupled to all of the switching devices of said sensing elements for controlling and addressing each switching device according to a sequence independent of the fingerprint to be sensed so that a predetermined potential is applied via each switching device when addressed to the sense electrode coupled thereto; and sensing means coupled to all of the switching devices of said sense elements for sensing capacitances based on said individual finger surface portions in combination with sense electrodes of said sense elements.
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