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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

FIG. 12 illustrates a flow diagram 1200 of an example method capturing an image at an ultrasonic sensor using a temperature to control the transmission frequency, according to embodiments. At procedure 1210 of flow diagram 1200, an imaging operation is performed at a two-dimensional array of ultrasonic transducers of the ultrasonic sensor to generate a plurality of pixels, wherein the ultrasonic sensor has a contact layer having a non-uniform thickness overlying the two-dimensional array of ultrasonic transducers and wherein the two-dimensional array of ultrasonic transducers is substantially flat.

At procedure 1220 of flow diagram 1200, a temperature of the ultrasonic sensor is determined. At procedure 1230, a transmission frequency of activated ultrasonic transducers is controlled during the imaging operation, wherein the transmission frequency is controlled based on the temperature of the ultrasonic sensor. The transmission frequency is selected to generate a constant interference pattern across all temperatures. At procedure 1240, at least one fingerprint image is captured using the transmission frequency. At procedure 1250, an interference pattern correction determined or calibrated at an initial temperature state is applied to the fingerprint image to generate the output fingerprint image.

At procedure 1260, the output fingerprint image is output (e.g., for use in fingerprint authentication).

權(quán)利要求

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