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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

While the embodiment of FIG. 4 includes processor 460 and memory 470, as described above, it should be appreciated that various functions of processor 460 and memory 470 may reside in other components of an electronic device. Moreover, it should be appreciated that processor 460 may be any type of processor for performing any portion of the described functionality (e.g., custom digital logic).

In some embodiments, fingerprint sensor also includes temperature sensor 480 which includes circuitry for temperature measurement. In an embodiment, temperature sensor 480 is an integrated silicon thermistor that can be incorporated in the manufacturing process with array 450. In another embodiment, temperature sensor 480 is a MEMS structure different from array 450 but compatible with the manufacturing process for PMUT array 450. In another embodiment, temperature sensor 480 is comprised within a CMOS control layer of the array 450. It should be appreciated that temperature sensor 480 may be any other type of sensor for determining a temperature of ultrasonic sensor 415.

Example Ultrasonic Sensor Having a Contact Layer of Non-Uniform Thickness

權(quán)利要求

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