公开(公告)号：US20220075976A1

公开(公告)日：2022-03-10

申请号：US17467633

申请日：2021-09-07

Applicant: Fingerprint Cards AB

Inventor： Frank RIEDIJK ,  David CARLING ,  Hans THÖRNBLOM ,  Wouter BREVET

IPC: G06K9/00 ,  G06F3/044

Abstract: A fingerprint sensor comprising a plurality of electrically conductive sensing structures arranged in a sensing plane for capacitively sensing a fingerprint of a finger; and measurement circuitry coupled to the plurality of electrically conductive sensing structures for providing measurement signals indicative of a capacitive coupling between each sensing structure in the plurality of electrically conductive sensing structures and the finger, wherein the measurement circuitry is arranged to: provide, using a first measurement circuitry configuration, a first set of measurement signals from a first set of sensing structures; and provide, using a second measurement circuitry configuration different from the first measurement circuitry configuration, a second set of measurement signals from a second set of sensing structures.

公开(公告)号：US20200064901A1

公开(公告)日：2020-02-27

申请号：US16609573

申请日：2018-04-24

Applicant: FINGERPRINT CARDS AB

Inventor： Peter ALMERS ,  David CARLING ,  Rolf SUNDBLAD ,  Nicholas WEINER ,  Benjamin WILLCOCKS

IPC: G06F1/3234 ,  G06F11/30 ,  G06F1/3206 ,  G06F1/26 ,  G06F1/10 ,  G06F21/60 ,  G06F21/62 ,  G06F21/32 ,  G06K19/07 ,  H04B5/00 ,  G06K9/00

Abstract: A method of controlling operation of a field-powered biometric device comprising biometric acquisition circuitry, processing circuitry controllable to transition between a first functional state having a first power consumption and a second functional state having a second power consumption lower than the first power consumption, and power management circuitry. The method comprises the steps of monitoring, by the power management circuitry, a property indicative of a supply voltage to the processing circuitry; controlling, when the monitored property indicates that the supply voltage has fallen to a first threshold voltage, the processing circuitry to transition from the first functional state to the second functional state; and controlling, when the monitored property indicates that the supply voltage has increased to a second threshold voltage higher than the first threshold voltage, the processing circuitry to transition from the second functional state to the first functional state.