- Patent Title: Fingerprint sensing device and method therein for noise detection
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Application No.: US15591578Application Date: 2017-05-10
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Publication No.: US09984274B2Publication Date: 2018-05-29
- Inventor: Fredrik Ramberg , Hans Thörnblom
- Applicant: Fingerprint Cards AB
- Applicant Address: SE Göteborg
- Assignee: Fingerprint Cards AB
- Current Assignee: Fingerprint Cards AB
- Current Assignee Address: SE Göteborg
- Agency: RMCK Law Group PLC
- Priority: SE16506446 20160513
- Main IPC: G06K9/00
- IPC: G06K9/00 ; G03F7/16 ; G06F3/044 ; G06F3/043

Abstract:
A capacitive fingerprint sensing device and method therein for noise detection are disclosed. The capacitive fingerprint sensing device comprises a plurality of sensing elements, each comprising a sensing structure and configured to sense a capacitive coupling between the sensing structure and a finger. The fingerprint sensing device further comprises sensing circuitry and timing circuitry configured to control a timing of a drive signal. The fingerprint sensing device is controllable to operate in a noise-detection mode and in a fingerprint mode. In the noise-detection mode, the fingerprint sensing device is configured to control the timing circuitry such that no drive signal is provided. The fingerprint sensing device senses a capacitive coupling between the finger and at least one sensing structure and provides a sensing signal indicative of the capacitive coupling between the finger and the sensing structures by means of said sensing circuitry.
Public/Granted literature
- US20170330013A1 FINGERPRINT SENSING DEVICE AND METHOD THEREIN FOR NOISE DETECTION Public/Granted day:2017-11-16
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