公开(公告)号：US20170330014A1

公开(公告)日：2017-11-16

申请号：US15591601

申请日：2017-05-10

Applicant: Fingerprint Cards AB

Inventor： Fredrik Ramberg ,  Hans Thörnblom

IPC: G06K9/00

CPC classification number: G06K9/0002

Abstract: A capacitive fingerprint sensing device and method therein for noise detection are disclosed. The fingerprint sensing device comprises a plurality of sensing elements, each having 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 configured to provide a sensing signal indicative of the capacitive coupling between the finger and the sensing structures 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. When in the noise-detection mode, the fingerprint sensing device is configured to control the timing circuitry such that a drive signal is provided. The fingerprint sensing device repeatedly senses a capacitive coupling between the finger and at least one sensing structure and provides a time-dependent sensing signal by means of said sensing circuitry.

公开(公告)号：US20170032165A1

公开(公告)日：2017-02-02

申请号：US15188473

申请日：2016-06-21

Applicant: Fingerprint Cards AB

Inventor： Morten Hansen ,  Fredrik Ramberg ,  Hans Thörnblom

IPC: G06K9/00

CPC classification number: G06K9/0002 ,  G06K9/00067

Abstract: An apparatus and a computer-implemented method of acquiring a fingerprint image from a fingerprint sensor with an array of sensor elements spanning a sensing area, comprising: monitoring groups of sensor elements located at group-wise spaced apart positions in the array of sensor elements, to determine a touch event occurring on the array of sensor elements; from the array of sensor elements, acquiring, at respective points in time, fingerprint sub-images which are confined in size to a subarea of the sensing area; as the fingerprint sub-images are acquired, computing values of a statistical indicator for the fingerprint sub-images; and acquiring a full fingerprint image when a predefined criterion indicates that the values of the statistical indicator has reached or is about to reach a stable state.

Abstract translation: 一种从具有跨越感测区域的传感器元件的阵列的指纹传感器获取指纹图像的装置和计算机实现的方法，包括：监测位于所述传感器元件阵列中的分组位置的传感器元件的组， 以确定在传感器元件阵列上发生的触摸事件; 从传感器元件的阵列，在各个时间点获取被限制在感测区域的子区域上的指纹子图像; 作为获取指纹子图像，计算指纹子图像的统计指标值; 并且当预定标准指示统计指示符的值已经达到或将要达到稳定状态时获取完整的指纹图像。

公开(公告)号：US20180173921A1

公开(公告)日：2018-06-21

申请号：US15724603

申请日：2017-10-04

Applicant: Fingerprint Cards AB

Inventor： Fredrik Ramberg ,  Hans Thörnblom

IPC: G06K9/00 ,  G06F3/041 ,  G06F3/044

CPC classification number: G06K9/0002 ,  G06F3/0416 ,  G06F3/044 ,  G06K9/00053

Abstract: There is provided a method for controlling a capacitive fingerprint sensing device for sensing a fingerprint pattern of a finger, the capacitive fingerprint sensor comprising a plurality of sensing elements. Each sensing element comprises a protective dielectric top layer to be touched by the finger, an electrically conductive sensing structure arranged underneath the top layer, sensing circuitry for providing an analog sensing signal indicative of a distance between the finger and the sensing structure. The fingerprint sensing device further comprises timing circuitry configured to control a timing of a drive signal, the drive signal being configured to provide a change in potential difference between the finger and the sensing structure. The method comprises forming a drive signal comprising a sequence of pulses, wherein a delay between consecutive pulses is controllable by said timing circuitry. There is also provided a sensing device configured to perform the above described method.

公开(公告)号：US20170330020A1

公开(公告)日：2017-11-16

申请号：US15456803

申请日：2017-03-13

Applicant: Fingerprint Cards AB

Inventor： Mats Tuneld ,  Fredrik Ramberg ,  Hans Thörnblom

IPC: G06K9/00

CPC classification number: G06K9/00087 ,  G06K9/00993 ,  G06K9/036

Abstract: The invention relates to a method of authenticating a user by means of a fingerprint authentication system comprising a fingerprint sensing arrangement and authentication circuitry. The method comprises the steps of acquiring a first candidate fingerprint image; acquiring a second candidate fingerprint image; processing, while acquiring the second candidate fingerprint image, the first candidate fingerprint image by the authentication circuitry; and evaluating a result of the processing. When the evaluation indicates that successful authentication is not likely based on the first candidate fingerprint image, the user is authenticated based on the second candidate fingerprint image.

公开(公告)号：US11176234B2

公开(公告)日：2021-11-16

申请号：US16605416

申请日：2018-04-17

Applicant: FINGERPRINT CARDS AB

Inventor： Markus Andersson ,  Fredrik Ramberg ,  Hans Thörnblom ,  Gabriel Rundlöf ,  Hamid Sarve ,  Troels Bjerre

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

Abstract: The present invention relates to a method for transitioning a device controller comprised with an electronic device from an at least partly inactive mode to an at least partly active mode, wherein the method comprises: determining the area portion of a finger detecting structure being touched by an object; determining a force applied on the fingerprint sensing device. When the area portion of the finger detecting structure being touched by the object exceeds a predetermined threshold area portion, and the force exceeds a predetermined threshold force value, transitioning, using the pre-processing module, the device controller from the at least partly inactive mode to the at least partly active mode. The invention also relates to such an electronic device.

公开(公告)号：US10002280B1

公开(公告)日：2018-06-19

申请号：US15724603

申请日：2017-10-04

Applicant: Fingerprint Cards AB

Inventor： Fredrik Ramberg ,  Hans Thörnblom

IPC: G06K9/00 ,  G06F3/044 ,  G06F3/041

Abstract: There is provided a method for controlling a capacitive fingerprint sensing device for sensing a fingerprint pattern of a finger, the capacitive fingerprint sensor comprising a plurality of sensing elements. Each sensing element comprises a protective dielectric top layer to be touched by the finger, an electrically conductive sensing structure arranged underneath the top layer, sensing circuitry for providing an analog sensing signal indicative of a distance between the finger and the sensing structure. The fingerprint sensing device further comprises timing circuitry configured to control a timing of a drive signal, the drive signal being configured to provide a change in potential difference between the finger and the sensing structure. The method comprises forming a drive signal comprising a sequence of pulses, wherein a delay between consecutive pulses is controllable by said timing circuitry. There is also provided a sensing device configured to perform the above described method.

公开(公告)号：US20170330013A1

公开(公告)日：2017-11-16

申请号：US15591578

申请日：2017-05-10

Applicant: Fingerprint Cards AB

Inventor： Fredrik Ramberg ,  Hans Thörnblom

IPC: G06K9/00

CPC classification number: G06K9/0002 ,  G03F7/16 ,  G06F3/043 ,  G06F3/0436 ,  G06F3/044 ,  G06K9/00053 ,  G06K9/00087 ,  G06K9/00899

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.

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：US10325139B2

公开(公告)日：2019-06-18

申请号：US15456803

申请日：2017-03-13

Applicant: Fingerprint Cards AB

Inventor： Mats Tuneld ,  Fredrik Ramberg ,  Hans Thörnblom

IPC: G06K9/00 ,  G06K9/03

Abstract: The invention relates to a method of authenticating a user by means of a fingerprint authentication system comprising a fingerprint sensing arrangement and authentication circuitry. The method comprises the steps of acquiring a first candidate fingerprint image; acquiring a second candidate fingerprint image; processing, while acquiring the second candidate fingerprint image, the first candidate fingerprint image by the authentication circuitry; and evaluating a result of the processing. When the evaluation indicates that successful authentication is not likely based on the first candidate fingerprint image, the user is authenticated based on the second candidate fingerprint image.

公开(公告)号：US09984274B2

公开(公告)日：2018-05-29

申请号：US15591578

申请日：2017-05-10

Applicant: Fingerprint Cards AB

Inventor： Fredrik Ramberg ,  Hans Thörnblom

IPC: G06K9/00 ,  G03F7/16 ,  G06F3/044 ,  G06F3/043

CPC classification number: G06K9/0002 ,  G03F7/16 ,  G06F3/043 ,  G06F3/0436 ,  G06F3/044 ,  G06K9/00053 ,  G06K9/00087 ,  G06K9/00899

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.