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公开(公告)号：US09977945B2
公开(公告)日：2018-05-22
申请号：US15464680
申请日：2017-03-21
Applicant: Fingerprint Cards AB
Inventor： Karl Lundahl , Robert Hägglund , Emil Hjalmarson , Rolf Sundblad , Christer Jansson
CPC classification number: G06K9/0002 , G06F3/0412 , G06F2203/0338 , G06F2203/04103 , G06K9/00087
Abstract: There is provided a capacitive fingerprint sensing device for sensing a fingerprint pattern of a finger, said capacitive fingerprint sensing device comprising: a protective top layer to be touched by said finger; a first metal layer comprising a two-dimensional array of sensing structures arranged underneath said top layer; a second metal layer, arranged underneath said first metal layer, comprising a plurality of conductive structures a dielectric layer arranged between the first and second metal layers to electrically insulate the first metal layer from the second metal layer, the dielectric layer comprising a low-k material; and readout circuitry arranged underneath said second metal layer and coupled to each of the electrically conductive sensing structures by means of via connections to receive a sensing signal indicative of a distance between said finger and said sensing structure. There is also provided a method for manufacturing such a device.
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公开(公告)号：US20170351895A1
公开(公告)日：2017-12-07
申请号：US15464680
申请日：2017-03-21
Applicant: Fingerprint Cards AB
Inventor： Karl Lundahl , Robert Hägglund , Emil Hjalmarson , Rolf Sundblad , Christer Jansson
IPC: G06K9/00
CPC classification number: G06K9/0002 , G06F3/0412 , G06F2203/0338 , G06F2203/04103 , G06K9/00087
Abstract: There is provided a capacitive fingerprint sensing device for sensing a fingerprint pattern of a finger, said capacitive fingerprint sensing device comprising: a protective top layer to be touched by said finger; a first metal layer comprising a two-dimensional array of sensing structures arranged underneath said top layer; a second metal layer, arranged underneath said first metal layer, comprising a plurality of conductive structures a dielectric layer arranged between the first and second metal layers to electrically insulate the first metal layer from the second metal layer, the dielectric layer comprising a low-k material; and readout circuitry arranged underneath said second metal layer and coupled to each of the electrically conductive sensing structures by means of via connections to receive a sensing signal indicative of a distance between said finger and said sensing structure. There is also provided a method for manufacturing such a device.
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3.发明授权公开(公告)号：US10474873B2
公开(公告)日：2019-11-12
申请号：US15806834
申请日：2017-11-08
Applicant: Fingerprint Cards AB
Inventor： Frank Riedijk , Wouter Brevet , Hans Thörnblom , Christer Jansson
Abstract: A method of determining a representation of a fingerprint pattern of a finger using a fingerprint sensor comprising a two-dimensional measuring arrangement including a plurality of measuring elements, each comprising a finger electrode spaced apart from the finger by a dielectric structure. For each measurement position, the method comprises the steps of: providing a first measuring element configuration with an elongated first measuring arrangement portion having a first principal direction of extension; and a first peripheral measuring arrangement portion; acquiring a first measurement value for the measurement position; providing a second measuring element configuration having an elongated second measuring arrangement portion having a second principal direction of extension; and a second peripheral measuring arrangement portion; and acquiring a second measurement value for the measurement position. The representation of the fingerprint pattern is determined based on the first measurement value and the second measurement value for each of the measurement positions.
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