Ultrasound fingerprint sensing and sensor fabrication

Abstract

Disclosed are systems, devices and methods for providing fingerprint sensors based on ultrasound imaging techniques in electronic devices and fabrication techniques for producing ultrasound-based fingerprint sensors. In some aspects, an ultrasound fingerprint sensor device includes an intermediate layer coupled to a base chip including an integrated circuit having conducive contacts at a surface of the base chip, the intermediate layer including an insulation layer formed on the base chip and a corresponding array of channeling electrode structures coupled to the conductive contacts and passing through the insulation layer, in which the channeling electrodes terminate at or above a top surface of the insulation layer to provide bottom electrodes; a plurality of ultrasonic transducer elements including an acoustic transducer material coupled to the bottom electrodes; and a plurality of top electrodes positioned on the ultrasonic transducer elements.

Description

[0001] Cross References to Related Applications [0002] This patent document claims priority and benefit to U.S. Provisional Patent Application No. 62 / 492,875, filed May 1, 2017, entitled "Ultrasonic Fingerprint Sensing and Sensor Fabrication." The entire contents of the aforementioned patent applications are incorporated by reference as part of the disclosure content of this patent document. technical field [0003] This patent document relates to fingerprint sensing and one or more sensing operations for performing other parameter measurements in an electronic device or system, including portable devices such as mobile devices or wearable devices, and larger systems. Background technique [0004] The implementation of various sensors in electronic devices or systems can provide certain desired functions. There is an increasing need for secure access to computers and computer-controlled devices or systems where only authorized users can be identified and differentiated fr...

AI Technical Summary

Problems solved by technology

Unfortunately, such a password recovery process can be cumbersome for the user under various circumstances, with various practical limitations and inconveniences

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