公开(公告)号：US20210357603A1

公开(公告)日：2021-11-18

申请号：US16757808

申请日：2018-10-23

Applicant: FINGERPRINT CARDS AB

Inventor： Farzan GHAVANINI ,  Jonas TALLHAGE ,  Frank RIEDIJK ,  René NILSSON ,  Wieslaw BICZ ,  Agnieszka BICZ

IPC: G06K9/00 ,  G06F3/043 ,  G06F3/041

Abstract: A method for controlling a plurality of ultrasonic transducers in a fingerprint sensing system that comprises a cover plate having a sensing surface configured to be touched by a finger, and a plurality of ultrasonic transducers located at the periphery of the cover plate and configured to transmit an acoustic signal propagating in the cover plate, receive an ultrasonic signal having interacted with an object in contact with the sensing surface, and to determine properties of the object based on the received ultrasonic signal. The method comprises: in response to a first input, controlling the plurality of transducers such that at least a portion of the sensing surface has a first feature detection resolution; and in response to a second input, controlling the plurality of transducers such that at least a portion of the sensing surface has a second feature detection resolution, different from the first feature detection resolution.