Fingerprint detection sensor and method of detecting fingerprint
First Claim
1. A fingerprint detection sensor, comprising:
- a plurality of piezoelectric sensors arranged on a two-dimensional plane; and
a fingerprint detection unit detecting a fingerprint by using ultrasonic signals discharged from the plurality of respective piezoelectric sensors,wherein the fingerprint detection unit determines whether the fingerprint is a forged fingerprint by detecting blood streams within a first region on the two-dimensional plane in which the ultrasonic signals discharged from the plurality of respective piezoelectric sensors overlap one another, andwherein the fingerprint detection unit determines whether the fingerprint is a forged fingerprint by detecting blood streams within a second region having an area larger than that of the first region, when the fingerprint detection unit fails to determine whether the fingerprint is the forged fingerprint within the first region.
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Abstract
There is provided a fingerprint detection sensor and a method of detecting a fingerprint. The fingerprint detection sensor according to embodiments of the present invention includes a plurality of piezoelectric sensors arranged on a two-dimensional plane; and a fingerprint detection unit detecting a fingerprint by using ultrasonic signals discharged from the plurality of respective piezoelectric sensors, wherein the fingerprint detection unit determines whether the fingerprint is a forged fingerprint by detecting bloodstreams within a first region on the two-dimensional plane in which the ultrasonic signals discharged from the plurality of respective piezoelectric sensors overlap one another.
86 Citations
9 Claims
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1. A fingerprint detection sensor, comprising:
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a plurality of piezoelectric sensors arranged on a two-dimensional plane; and a fingerprint detection unit detecting a fingerprint by using ultrasonic signals discharged from the plurality of respective piezoelectric sensors, wherein the fingerprint detection unit determines whether the fingerprint is a forged fingerprint by detecting blood streams within a first region on the two-dimensional plane in which the ultrasonic signals discharged from the plurality of respective piezoelectric sensors overlap one another, and wherein the fingerprint detection unit determines whether the fingerprint is a forged fingerprint by detecting blood streams within a second region having an area larger than that of the first region, when the fingerprint detection unit fails to determine whether the fingerprint is the forged fingerprint within the first region. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of detecting a fingerprint, the method comprising:
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discharging ultrasonic signals to a specific object from a plurality of piezoelectric sensors arranged on a two-dimensional plane in a matrix form; detecting reflected signals generated by reflecting the ultrasonic signals to the object within a first region on the two-dimensional plane in which the ultrasonic signals overlap one another; determining whether the object is a living body by using a difference in frequency between the ultrasonic signals and the reflected signals, the determining being performed by using the difference in frequency generated by blood streams within the object between the ultrasonic signals and the reflected signals; and detecting the reflected signals within a second region having an area larger than that of the first region when determining whether the object is a living body fails. - View Dependent Claims (8, 9)
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Specification