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Operating a fingerprint sensor comprised of ultrasonic transducers

  • US 10,452,887 B2
  • Filed: 11/17/2016
  • Issued: 10/22/2019
  • Est. Priority Date: 05/10/2016
  • Status: Active Grant
First Claim
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1. A method for operating a fingerprint sensor comprising a plurality of ultrasonic transducers, the method comprising:

  • activating a first subset of ultrasonic transducers of the fingerprint sensor, the first subset of ultrasonic transducers for detecting interaction between an object and the fingerprint sensor; and

    subsequent to detecting interaction between an object and the fingerprint sensor, activating a second subset of ultrasonic transducers of the fingerprint sensor, 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.

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