公开(公告)号：US11288891B2

公开(公告)日：2022-03-29

申请号：US16659329

申请日：2019-10-21

Applicant: InvenSense, Inc.

Inventor： James Christian Salvia ,  Hao-Yen Tang ,  Michael H. Perrott ,  Bruno W. Garlepp ,  Etienne De Foras

IPC: G06K9/00 ,  G06F3/043 ,  G06F1/3231 ,  G06F1/3287 ,  G06V40/13 ,  G06V40/12

Abstract: In a method for operating a fingerprint sensor comprising a plurality of ultrasonic transducers, a first subset of ultrasonic transducers of the fingerprint sensor are activated, the first subset of ultrasonic transducers for detecting interaction between an object and the fingerprint sensor. Subsequent to detecting interaction between an object and the fingerprint sensor, a second subset of ultrasonic transducers of the fingerprint sensor are activated, the second subset of ultrasonic transducers for determining whether the object is a human finger, wherein the second subset of ultrasonic transducers comprises a greater number of ultrasonic transducers than the first subset of ultrasonic transducers.