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A fingerprint sensor that integrates fraud detection and fingerprint sensing to prevent spoofing with a fake (artificial) finger is presented. Fingerprint identification using capacitive fingerprint sensing provides small user-authentication systems. For systems that need a higher level of security, fraud detection, which determines whether the sensed finger is alive or not, is necessary. Integrating...
The authors performed a scratch test in which a weighted needle applies scratch stress to the surface of a capacitive fingerprint sensor large scale integration (LSI), which has a grounded wall (GND wall) structure where each sensor plate is surrounded by a lattice-like wall. The scratch stress degrades not only the sensor's surface but also the metal interlayer. Increasing the thickness of the surface...
We evaluated the electrostatic discharge (ESD) hardness for some kinds of capacitive fingerprint sensor LSIs. In contact discharge tests, our sensor with the GND wall structure and another sensor with a GND demonstrated of ESD failure voltage above plusmn8 kV. On the other hand, in air discharge tests, ESD tolerance of our GND wall structure was over plusmn 20 kV, whereas that of the other GND structure...
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