Invention Grant
- Patent Title: Capacitive fingerprint sensing device with current readout from sensing elements
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Application No.: US14872510Application Date: 2015-10-01
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Publication No.: US09600705B2Publication Date: 2017-03-21
- Inventor: Frank Robert Riedijk
- Applicant: FINGERPRINT CARDS AB
- Applicant Address: SE Göteborg
- Assignee: FINGERPRINT CARDS AB
- Current Assignee: FINGERPRINT CARDS AB
- Current Assignee Address: SE Göteborg
- Agency: Remarck Law Group PLC
- Priority: SE1550152 20150211
- Main IPC: G06K9/00
- IPC: G06K9/00 ; G06F3/044

Abstract:
The present invention relates to a capacitive fingerprint sensing device comprising a plurality of sensing elements. Each sensing element includes a protective dielectric top layer to be touched by a finger; an electrically conductive sensing structure arranged underneath the top layer; a charge amplifier connected to the sensing structure for providing a sensing voltage signal indicative of a change of a charge carried by the sensing structure resulting from a change in a potential difference between the finger and the sensing structure; and a voltage-to-current converter for converting the sensing voltage signal to a sensing current signal indicative of the change of charge carried by the sensing structure. Hereby, accurate sensing as well as faster operation of the sensing elements can be achieved without a corresponding increase in power consumption.
Public/Granted literature
- US20160232394A1 CAPACITIVE FINGERPRINT SENSING DEVICE WITH CURRENT READOUT FROM SENSING ELEMENTS Public/Granted day:2016-08-11
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