公开(公告)号：US20210173501A1

公开(公告)日：2021-06-10

申请号：US16983788

申请日：2020-08-03

Applicant: Fingerprint Cards AB

Inventor： Andreas LARSSON ,  Frank RIEDIJK

IPC: G06F3/044 ,  G06F3/041 ,  G06K9/00 ,  G06F21/32 ,  G11C11/419

Abstract: A fingerprint sensing system comprising a plurality of conductive selection lines; a plurality of conductive read-out lines crossing the selection lines; selection circuitry controllable to provide a selection signal on at least one selected selection line in the plurality of selection lines; a plurality of pixel elements formed at intersections between the selection lines and the read-out lines; a reference signal source configured to provide a reference signal; and read-out circuitry coupled to each read-out line in the plurality of read-out lines and to the reference signal source, the read-out circuitry being configured to acquire a read-out signal via a read-out line connected to a selected pixel element, when the selected pixel element provides the sensing signal; acquire a reference signal from the reference signal source; form a corrected read-out signal for the selected pixel element based on the read-out signal and the reference signal; and provide corrected read-out signals.