公开(公告)号：US09864895B1

公开(公告)日：2018-01-09

申请号：US15464582

申请日：2017-03-21

Applicant: Fingerprint Cards AB

Inventor： Andreas Larsson ,  Frank Riedijk ,  Hans Thörnblom

IPC: G06K9/00

CPC classification number: G06K9/0002 ,  G06K9/00087

Abstract: The present invention relates to a method of sensing a fingerprint pattern of a finger using a fingerprint sensing device. The method comprising: controlling a group of sensing elements to change a potential of a group of sensing structures comprised in said group of sensing elements; acquiring, in response to said variation in potential, a response signal from a finger detecting circuitry indicative of the capacitive coupling between the group of sensing structures and the finger detecting structure; comparing a variation in the response signal with a predefined threshold value; and providing a signal indicating that a finger is present when the variation in response signal is greater than the threshold value. The invention also relates to a corresponding fingerprint sensing device.

公开(公告)号：US09589171B1

公开(公告)日：2017-03-07

申请号：US15176891

申请日：2016-06-08

Applicant: Fingerprint Cards AB

Inventor： Andreas Larsson ,  Hans Thörnblom ,  Fredrik Ramberg ,  Frank Robert Riedijk ,  Robert Hägglund

IPC: G06K9/00

CPC classification number: G06K9/0012 ,  G06K9/0002

Abstract: The present invention relates to a method of sensing a fingerprint pattern of a finger using a fingerprint sensing device comprising an array of sensing elements; an electrically conductive finger detecting structure; and finger detecting circuitry connected to the finger detecting structure for providing a finger detection signal indicative of a capacitive coupling between the finger detecting structure and the finger. The method comprises the steps of: comparing the finger detection signal with a first threshold value indicating a first capacitive coupling, and a second threshold value indicating a second capacitive coupling stronger than the first capacitive coupling; and activating at least a subset of the sensing elements when the finger detection signal changes from a first value indicating a capacitive coupling weaker than the first capacitive coupling to a second value indicating a capacitive coupling stronger than the second capacitive coupling.

Abstract translation: 本发明涉及使用包括感测元件阵列的指纹感测装置感测手指的指纹图案的方法; 导电手指检测结构; 以及连接到手指检测结构的手指检测电路，用于提供指示手指检测结构和手指之间的电容耦合的手指检测信号。 该方法包括以下步骤：将手指检测信号与指示第一电容耦合的第一阈值和指示比第一电容耦合更强的第二电容耦合的第二阈值进行比较; 以及当手指检测信号从表示比第一电容耦合弱的电容耦合的第一值改变到指示比第二电容耦合更强的电容耦合的第二值时激活感测元件的至少一个子集。

公开(公告)号：US11093090B2

公开(公告)日：2021-08-17

申请号：US16983788

申请日：2020-08-03

Applicant: Fingerprint Cards AB

Inventor： Andreas Larsson ,  Frank Riedijk

IPC: G06F3/044 ,  G06F3/041 ,  G11C11/419 ,  G06K9/00 ,  G06F21/32

Abstract: A fingerprint sensing system comprising a plurality of conductive selection lines; a plurality of conductive read-out lines crossing the selection lines; selection circuitry controllable to provide a selection signal on at least one selected selection line in the plurality of selection lines; a plurality of pixel elements formed at intersections between the selection lines and the read-out lines; a reference signal source configured to provide a reference signal; and read-out circuitry coupled to each read-out line in the plurality of read-out lines and to the reference signal source, the read-out circuitry being configured to acquire a read-out signal via a read-out line connected to a selected pixel element, when the selected pixel element provides the sensing signal; acquire a reference signal from the reference signal source; form a corrected read-out signal for the selected pixel element based on the read-out signal and the reference signal; and provide corrected read-out signals.

公开(公告)号：US20180012053A1

公开(公告)日：2018-01-11

申请号：US15464582

申请日：2017-03-21

Applicant: Fingerprint Cards AB

Inventor： Andreas Larsson ,  Frank Riedijk ,  Hans Thörnblom

IPC: G06K9/00

CPC classification number: G06K9/0002 ,  G06K9/00087

Abstract: The present invention relates to a method of sensing a fingerprint pattern of a finger using a fingerprint sensing device. The method comprising: controlling a group of sensing elements to change a potential of a group of sensing structures comprised in said group of sensing elements; acquiring, in response to said variation in potential, a response signal from a finger detecting circuitry indicative of the capacitive coupling between the group of sensing structures and the finger detecting structure; comparing a variation in the response signal with a predefined threshold value; and providing a signal indicating that a finger is present when the variation in response signal is greater than the threshold value. The invention also relates to a corresponding fingerprint sensing device.

公开(公告)号：US09842242B1

公开(公告)日：2017-12-12

申请号：US15622236

申请日：2017-06-14

Applicant: Fingerprint Cards AB

Inventor： Andreas Larsson ,  David Carling ,  Fredrik Ramberg ,  Hans Thörnblom

IPC: G06K9/00

CPC classification number: G06K9/0002 ,  G06K9/00067

Abstract: The present invention relates to a method for determining a finger movement event on a fingerprint sensor. The method comprises to acquire signals indicative of the portion of finger detecting structures that may be touched by a finger. Based on the ratio between the signals and a total signal level, the position of the finger on the fingerprint sensing device can be determined at two different time instances. Based on the positions which may be the same, a finger movement event may be determined. The invention also relates to a corresponding fingerprint sensing device.