Method for detecting spoof fingerprints with an under-display fingerprint sensor

    公开(公告)号:US11620852B2

    公开(公告)日:2023-04-04

    申请号:US17469473

    申请日:2021-09-08

    Inventor: Paul Wickboldt

    Abstract: A method for detecting spoof fingerprints with an under-display fingerprint sensor includes illuminating, with incident light emitted from a display, a target region of a fingerprint sample disposed on a top surface of the display; detecting a first scattered signal from the fingerprint sample with a first image sensor region of an image sensor located beneath the display, the first image sensor region not directly beneath the target region, the first scattered signal including a first portion of the incident light scattered by the target region; determining a scattered light distribution based at least in part on the first scattered signal; and identifying spoof fingerprints based at least in part on the scattered light distribution.

    ANTI-SPOOFING OPTICAL FINGERPRINT SENSOR METHODS AND HARDWARE WITH COLOR SELECTION

    公开(公告)号:US20230070139A1

    公开(公告)日:2023-03-09

    申请号:US17469565

    申请日:2021-09-08

    Inventor: Paul Wickboldt

    Abstract: An optical fingerprint sensor with spoof detection includes a plurality of lenses; a pixel array including a plurality of first photodiodes, a line between a center of each first photodiode and an optical center of each lens forms an optical axis; at least one apertured baffle-layer positioned between the image sensor and the plurality of lenses, each having a respective plurality of aperture stops, each aperture stop being center-aligned with the optical axis; and a plurality of second photodiodes intercalated with the plurality of first photodiodes; and a color filter layer between the pixel array and the plurality of lenses, said color filter layer includes a plurality of color filters positioned such that each second photodiode is configured to detect electromagnetic energy having passed through lens, a color filter, and at least one aperture stop not aligned along the optical axis.

    OPTICAL FINGERPRINT SENSOR WITH SPOOF DETECTION AND ASSOCIATED METHOD

    公开(公告)号:US20230072103A1

    公开(公告)日:2023-03-09

    申请号:US17469461

    申请日:2021-09-08

    Abstract: An optical fingerprint sensor with spoof detection includes a plurality of lenses, an image sensor including a pixel array that includes a plurality of first photodiodes and a plurality of second photodiodes, and at least one apertured baffle-layer having a plurality of aperture stops, wherein each second photodiode is configured to detect light having passed through a lens and at least one aperture stop not aligned with the lens along an optical axis. A method for detecting spoof fingerprints detected using an optical fingerprint sensor includes detecting large-angle light incident on a plurality of anti-spoof photodiodes, wherein the plurality of anti-spoof photodiodes is interleaved with a plurality of imaging photodiodes, determining an angular distribution of light based at least in part one the large-angle light, and detecting spoof fingerprints based at least in part on the angular distribution of light.

    Optical fingerprint sensor with spoof detection and associated method

    公开(公告)号:US11842563B2

    公开(公告)日:2023-12-12

    申请号:US17469461

    申请日:2021-09-08

    Abstract: An optical fingerprint sensor with spoof detection includes a plurality of lenses, an image sensor including a pixel array that includes a plurality of first photodiodes and a plurality of second photodiodes, and at least one apertured baffle-layer having a plurality of aperture stops, wherein each second photodiode is configured to detect light having passed through a lens and at least one aperture stop not aligned with the lens along an optical axis. A method for detecting spoof fingerprints detected using an optical fingerprint sensor includes detecting large-angle light incident on a plurality of anti-spoof photodiodes, wherein the plurality of anti-spoof photodiodes is interleaved with a plurality of imaging photodiodes, determining an angular distribution of light based at least in part one the large-angle light, and detecting spoof fingerprints based at least in part on the angular distribution of light.

    METHOD OF DETECTING SPOOF FINGERPRINTS USING AN OPTICAL FINGERPRINT SENSOR AND POLARIZATION

    公开(公告)号:US20230071334A1

    公开(公告)日:2023-03-09

    申请号:US17975021

    申请日:2022-10-27

    Inventor: Paul Wickboldt

    Abstract: A method for detecting spoof fingerprints detected using an optical fingerprint sensor and polarization includes controlling a display of an electronic device to output a pattern of light to illuminate a fingerprint sample touching the display; blocking smaller-angle light from impinging a plurality of anti-spoof photodiodes of the pixel array; filtering larger-angle light incident on the plurality of anti-spoof photodiodes to at least one polarization direction; detecting the larger-angle light using the plurality of anti-spoof photodiodes; correlating the larger-angle light with the pattern of light; determining the fingerprint spoofing based at least in part on the correlation of the larger-angle light and the pattern of light; and wherein the plurality of anti-spoof photodiodes is interleaved with a plurality of imaging photodiodes such that each anti-spoof photodiode of the plurality of anti-spoof photodiodes is between adjacent imaging photodiodes of the plurality of imaging photodiodes.

    Anti-spoofing optical fingerprint sensor methods and hardware with color selection

    公开(公告)号:US11594069B1

    公开(公告)日:2023-02-28

    申请号:US17469565

    申请日:2021-09-08

    Inventor: Paul Wickboldt

    Abstract: An optical fingerprint sensor with spoof detection includes a plurality of lenses; a pixel array including a plurality of first photodiodes, a line between a center of each first photodiode and an optical center of each lens forms an optical axis; at least one apertured baffle-layer positioned between the image sensor and the plurality of lenses, each having a respective plurality of aperture stops, each aperture stop being center-aligned with the optical axis; and a plurality of second photodiodes intercalated with the plurality of first photodiodes; and a color filter layer between the pixel array and the plurality of lenses, said color filter layer includes a plurality of color filters positioned such that each second photodiode is configured to detect electromagnetic energy having passed through lens, a color filter, and at least one aperture stop not aligned along the optical axis.

    Method of detecting spoof fingerprints using an optical fingerprint sensor and polarization

    公开(公告)号:US11676417B2

    公开(公告)日:2023-06-13

    申请号:US17975021

    申请日:2022-10-27

    Inventor: Paul Wickboldt

    CPC classification number: G06V40/1394 G06V40/1318

    Abstract: A method for detecting spoof fingerprints detected using an optical fingerprint sensor and polarization includes controlling a display of an electronic device to output a pattern of light to illuminate a fingerprint sample touching the display; blocking smaller-angle light from impinging a plurality of anti-spoof photodiodes of the pixel array; filtering larger-angle light incident on the plurality of anti-spoof photodiodes to at least one polarization direction; detecting the larger-angle light using the plurality of anti-spoof photodiodes; correlating the larger-angle light with the pattern of light; determining the fingerprint spoofing based at least in part on the correlation of the larger-angle light and the pattern of light; and wherein the plurality of anti-spoof photodiodes is interleaved with a plurality of imaging photodiodes such that each anti-spoof photodiode of the plurality of anti-spoof photodiodes is between adjacent imaging photodiodes of the plurality of imaging photodiodes.

    METHOD FOR DETECTING SPOOF FINGERPRINTS WITH AN UNDER-DISPLAY FINGERPRINT SENSOR

    公开(公告)号:US20230071596A1

    公开(公告)日:2023-03-09

    申请号:US17469473

    申请日:2021-09-08

    Inventor: Paul Wickboldt

    Abstract: A method for detecting spoof fingerprints with an under-display fingerprint sensor includes illuminating, with incident light emitted from a display, a target region of a fingerprint sample disposed on a top surface of the display; detecting a first scattered signal from the fingerprint sample with a first image sensor region of an image sensor located beneath the display, the first image sensor region not directly beneath the target region, the first scattered signal including a first portion of the incident light scattered by the target region; determining a scattered light distribution based at least in part on the first scattered signal; and identifying spoof fingerprints based at least in part on the scattered light distribution.

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