公开(公告)号：US09971926B2

公开(公告)日：2018-05-15

申请号：US15484554

申请日：2017-04-11

Applicant: Fingerprint Cards AB

Inventor： Frank Riedijk ,  Hans Thörnblom ,  Daniel Andersson

IPC: G06K9/00

CPC classification number: G06K9/0002 ,  G06K9/00053

Abstract: There is provided a capacitive fingerprint sensing device for sensing a fingerprint pattern of a finger, the capacitive fingerprint sensor comprising: a protective dielectric top layer to be touched by the finger; a two-dimensional array of electrically conductive sensing structures arranged underneath the top layer; readout circuitry coupled to each of the electrically conductive sensing structures to receive a sensing signal indicative of a distance between the finger and the sensing structure, the readout circuitry comprising a plurality of signal amplifiers arranged underneath the array of electrically conductive sensing structures, wherein a number of signal amplifiers is lower than a number of sensing structures; and selection circuitry coupling each of the sensing structures to at least one signal amplifier and configured to select a sensing structure to be coupled to a corresponding signal amplifier. There is also provided a method for controlling a fingerprint sensing device.

公开(公告)号：US09881197B2

公开(公告)日：2018-01-30

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：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.

公开(公告)号：US09818016B2

公开(公告)日：2017-11-14

申请号：US15158749

申请日：2016-05-19

Applicant: FINGERPRINT CARDS AB

Inventor： Sebastian Weber ,  Hans Thörnblom

IPC: G06K9/00

CPC classification number: G06K9/00026

Abstract: The present invention generally relates to a method for forming a fingerprint using a fingerprint sensing system, and specifically to the possibility of allowing the formation of a fingerprint when only separated portions of the fingerprint is available. The invention also relates to the corresponding fingerprint sensing system and to a computer program product.

公开(公告)号：US20170169278A1

公开(公告)日：2017-06-15

申请号：US15359014

申请日：2016-11-22

Applicant: Fingerprint Cards AB

Inventor： Eric Setterberg ,  Hans Thörnblom

IPC: G06K9/00

Abstract: The present invention generally relates to a method forming a fingerprint image using a fingerprint sensing system, and specifically the formation of an improved fingerprint image by combining fingerprint image data from a plurality of subsequently acquired images of a finger. The invention also relates to a corresponding fingerprint sensing system and to a computer program product.

公开(公告)号：US09600707B1

公开(公告)日：2017-03-21

申请号：US15196617

申请日：2016-06-29

Applicant: Fingerprint Cards AB

Inventor： Fredrik Ramberg ,  Hans Thörnblom ,  David Carling ,  Frank Robert Riedijk

IPC: G06F3/045 ,  G06K9/00

CPC classification number: G06K9/0002 ,  G06F3/045 ,  G06K9/00053

Abstract: There is provided a capacitive fingerprint sensing device comprising a plurality of sensing elements, sensing circuitry for providing an analog sensing signal, drive signal circuitry providing a drive signal comprising a drive pulse having a maximum level and a minimum level, providing a change in potential difference between the finger and the sensing structure, analog sampling circuitry comprising at least three analog sample and hold circuits arranged to sample the sensing signal, and a sampling control unit for individually controlling the sample and hold circuits to capture a sample at a specified time, wherein the samples comprises one sample captured when the drive signal is at a first voltage level V1 and one sample captured when the drive signal is at a second voltage level V2, different from V1; and an analog-to-digital converter, ADC, configured to convert a combination of the samples into a digital signal, wherein the three samples are captured times such that a noise component is suppressed from the sensing signal when the combination is formed.

公开(公告)号：US09600706B2

公开(公告)日：2017-03-21

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.

公开(公告)号：US20160283771A1

公开(公告)日：2016-09-29

申请号：US15172930

申请日：2016-06-03

Applicant: Fingerprint Cards AB

Inventor： Frank Robert Riedijk ,  Hans Thörnblom

IPC: G06K9/00 ,  H04N5/232 ,  H04N5/376 ,  H04N5/378

CPC classification number: G06K9/00013 ,  G06F3/016 ,  G06F3/0338 ,  G06F3/041 ,  G06F3/0416 ,  G06F3/044 ,  G06F2203/04105 ,  G06K9/0002 ,  H04N5/23241 ,  H04N5/3765 ,  H04N5/378

Abstract: A fingerprint sensing system comprises a sensor array with a plurality of sensing structures and read-out circuitry connectable to each of the sensing structures, and power supply circuitry arranged to provide to the read-out circuitry a substantially constant supply voltage being a difference between a high potential and a low potential. The fingerprint sensing system is configured in such a way that the low potential and the high potential are variable while substantially maintaining the supply voltage, and the read-out circuitry is connectable to each of the sensing structures in such a way that a variation in the low potential and the high potential while substantially maintaining the supply voltage results in a change of the charge carried by a sensing structure connected to the read-out circuitry. The change in charge is indicative of a capacitive coupling between the sensing structure and the finger.

Abstract translation: 指纹感测系统包括具有可连接到每个感测结构的多个感测结构和读出电路的传感器阵列，和布置成向读出电路提供基本上恒定的电源电压的电源电路，该电源电压是 高潜力和低潜力。 指纹感测系统被配置为使得低电位和高电位是可变的，同时基本上保持电源电压，并且读出电路可以以这样的方式连接到每个感测结构，即， 低电位和高电位，同时基本上保持电源电压导致连接到读出电路的感测结构承载的电荷的变化。 电荷的变化表示感测结构和手指之间的电容耦合。