Acoustic biometric touch scanner
AssigneeThe Board of Trustees of the Leland Stanford Junior University
InventorsMorten Fischer Rasmussen, Gerard Touma, Butrus T. Khuri-Yakub
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Abstract
An acoustic biometric touch scanner device and method is disclosed. In one aspect, an acoustic fingerprint sensing device includes an array of ultrasonic transducers configured to transmit an ultrasound signal having a frequency in a range from 50 megahertz (MHz) to 500 MHz. The acoustic fingerprint ultrasonic transducers include a piezoelectric film. The acoustic fingerprint sensing device further includes a receiving surface configured to receive a finger. The acoustic fingerprint sensing device further includes a processor configured to generate an image of at least a portion of a fingerprint of the finger based on a reflection of the ultrasound signal from the finger.
Claims21
(canceled)
An ultrasonic biometric sensing device comprising:
- a surface;
- an array of ultrasonic transducers comprising a piezoelectric layer and electrodes, the electrodes comprising row electrodes and column electrodes disposed on opposing sides of the array of ultrasonic transducers, the electrodes configured to address the ultrasonic transducers of the array, the ultrasonic transducers configured to transmit an ultrasound signal to an object positioned on the surface;
- and
- a processor configured to generate an image of at least a portion of the object based on a reflection of the ultrasound signal from the object, generate a liveness parameter associated with the object, and authenticate the object based on the image and the liveness parameter.
A method of performing biometric authentication, the method comprising:
- transmitting, using an array of ultrasonic transducers, an ultrasound signal to an object in contact with a surface, wherein the array of ultrasonic transducers comprises a piezoelectric layer and electrodes, wherein the electrodes comprise row electrodes and column electrodes disposed on opposing sides of the array of ultrasonic transducers;
- receiving, using the array of ultrasonic transducers, a reflection of the ultrasound signal from the object;
- detecting a liveness parameter associated with the object;
- and
- authenticating the object based on the reflection of the ultrasound signal and the liveness parameter.
Dependencies are inferred from the claim text.