Abstract: The present disclosure generally relates to a method for authenticating a user using an electronic device, where the electronic device comprises a fingerprint sensor as well as a first and a second control unit. Preferably, the first control unit comprises a secure element and/or a secure block adapted to provide a secure processing environment. The present disclosure also relates to a corresponding electronic device and to a computer program product.

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.

Abstract: A method of determining a representation of a fingerprint pattern of a finger using a fingerprint sensor comprising a two-dimensional measuring arrangement including a plurality of measuring elements, each comprising a finger electrode spaced apart from the finger by a dielectric structure. For each measurement position, the method comprises the steps of: providing a first measuring element configuration with an elongated first measuring arrangement portion having a first principal direction of extension; and a first peripheral measuring arrangement portion; acquiring a first measurement value for the measurement position; providing a second measuring element configuration having an elongated second measuring arrangement portion having a second principal direction of extension; and a second peripheral measuring arrangement portion; and acquiring a second measurement value for the measurement position.

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.

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.

Abstract: A method of determining a physical property of a finger using a sensor comprising a two-dimensional measuring arrangement including a plurality of measuring elements, each defining a measuring element position in the measuring arrangement, and each comprising a finger electrode spaced apart from the finger by a dielectric structure. For each measuring element position, the method comprises the steps of performing a first sensing operation using a first capacitive configuration, acquiring a first measurement value for the first capacitive configuration, performing a second sensing operation using a second capacitive configuration, acquiring a second measurement value for the second capacitive configuration. The physical property of the finger is determined based on the first and second measurement values for each measuring element position.

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.

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.

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.

Abstract: A method of determining a representation of a fingerprint pattern of a finger using a fingerprint sensor comprising a two-dimensional measuring arrangement including a plurality of measuring elements, each comprising a finger electrode spaced apart from the finger by a dielectric structure. For each measurement position, the method comprises the steps of: providing a first measuring element configuration with an elongated first measuring arrangement portion having a first principal direction of extension; and a first peripheral measuring arrangement portion; acquiring a first measurement value for the measurement position; providing a second measuring element configuration having an elongated second measuring arrangement portion having a second principal direction of extension; and a second peripheral measuring arrangement portion; and acquiring a second measurement value for the measurement position.

Abstract: A method of determining a physical property of a finger using a sensor comprising a two-dimensional measuring arrangement including a plurality of measuring elements, each defining a measuring element position in the measuring arrangement, and each comprising a finger electrode spaced apart from the finger by a dielectric structure. For each measuring element position, the method comprises the steps of performing a first sensing operation using a first capacitive configuration, acquiring a first measurement value for the first capacitive configuration, performing a second sensing operation using a second capacitive configuration, acquiring a second measurement value for the second capacitive configuration. The physical property of the finger is determined based on the first and second measurement values for each measuring element position.

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.

Abstract: The present invention relates to a method of estimating a finger movement direction of a finger, comprising the steps of: a) acquiring a reference fingerprint image; b) acquiring at least one candidate fingerprint image at each acquisition time in a time sequence of acquisition times; c) determining, for each of the acquisition times, a match parameter value for each of a plurality of candidate finger movement directions, the match parameter value being indicative of a correlation between a reference fingerprint image portion and a candidate fingerprint image portion corresponding to displacement in the candidate finger movement direction; d) determining, for each of the candidate finger movement directions, a local extremum match parameter value indicating a maximum correlation for the time sequence of acquisition times; and e) estimating the finger movement based on an evaluation of the determined local extremum match parameters.

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.

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.

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.

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.

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.

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.

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.