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Ultrasonic fingerprint sensor with a contact layer of non-uniform thickness

專利號
US11176345B2
公開日期
2021-11-16
申請人
InvenSense, Inc.(US CA San Jose)
發(fā)明人
Quy Chau; Mei-Lin Chan
IPC分類
G06K9/00
技術(shù)領(lǐng)域
ultrasonic,pmut,layer,sensor,in,image,contact,tof,acoustic,be
地域: CA CA San Jose

摘要

An ultrasonic sensor includes a two-dimensional array of ultrasonic transducers, wherein the two-dimensional array of ultrasonic transducers is substantially flat, a contact layer having a non-uniform thickness overlying the two-dimensional array of ultrasonic transducers, and an array controller configured to control activation of ultrasonic transducers during an imaging operation. During the imaging operation, the array controller is configured to control a transmission frequency of activated ultrasonic transducers during the imaging operation, wherein a plurality of transmission frequencies are used during the imaging operation to account for an impact of an interference pattern caused by the non-uniform thickness of the contact layer, and is configured to capture at least one fingerprint image using the plurality of transmission frequencies.

說明書

FIGS. 11 and 12 illustrate flow diagrams of example methods for operating a fingerprint sensor comprised of ultrasonic transducers, according to various embodiments. Procedures of these methods will be described with reference to elements and/or components of various figures described herein. It is appreciated that in some embodiments, the procedures may be performed in a different order than described, that some of the described procedures may not be performed, and/or that one or more additional procedures to those described may be performed. The flow diagrams include some procedures that, in various embodiments, are carried out by one or more processors (e.g., a host processor or a sensor processor) under the control of computer-readable and computer-executable instructions that are stored on non-transitory computer-readable storage media. It is further appreciated that one or more procedures described in the flow diagrams may be implemented in hardware, or a combination of hardware with firmware and/or software.

權(quán)利要求

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