公开(公告)号：US20230177869A1

公开(公告)日：2023-06-08

申请号：US17920073

申请日：2021-04-27

Applicant: FINGERPRINT CARDS ANACATUM IP AB

Inventor： Matthew Liptrot ,  Arvid Hammar ,  Hans Martinsson

IPC: G06V40/13 ,  G06V40/12 ,  G02B27/30 ,  H01L27/146

CPC classification number: G06V40/1324 ,  G06V40/1394 ,  G02B27/30 ,  H01L27/14625 ,  G02B5/201

Abstract: An optical biometric imaging device comprising: an image sensor comprising a plurality of photodetector pixels; a plurality of collimating structures arranged above the image sensor, the collimating structures being configured to limit the incident angle of light reaching the image sensor to be lower than a first predetermined incident angle Θ1; wherein at least a subset of the collimating structures comprises a light-blocking element configured to block light having an incident angle lower than a second predetermined incident angle Θ2, the second incident angle being lower than the first incident angle, wherein the light-blocking element is configured to allow light having an incident angle between the first and second predetermined incident angles to pass and wherein the light-blocking element is configured to block light within a first predetermined wavelength range.