Fingerprint sensor with potential modulation of the ESD...

Details Fingerprint sensor with potential modulation of the ESD... Fingerprint sensor with potential modulation of the ESD...

2006-04-11

2006-04-11

Ahmed, Samir (Department: 2623)

Image analysis

Applications

Personnel identification

C283S068000, C283S069000, C283S070000, C283S078000

Reexamination Certificate

active

07027625

ABSTRACT:
The invention relates to fingerprint sensors. A fingerprint sensor has a plurality of sensor electrodes below a surface intended for contacting the underside of a finger. At least one protective electrode is mounted on the surface. The sensor electrodes can have a first AC voltage at a prescribed frequency applied to them. The protective electrode can have a second AC voltage, which is essentially at the prescribed frequency, applied to it.

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Inglis, D. et al.: “SA 17.7: A Robust 1.8V 250μW Direct-Contact 500dpi Fingerprint Sensor”, IEEE International Solid-State Circuits Conference, 1998, pp. 284-285.

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