Capacitance-type fingerprint sensor

Details Capacitance-type fingerprint sensor Capacitance-type fingerprint sensor

2007-11-20

2007-11-20

Bali, Vikkram (Department: 2624)

Image analysis

Applications

Personnel identification

Reexamination Certificate

active

11018372

ABSTRACT:
A capacitance-type fingerprint sensor. The capacitance-type fingerprint sensor includes a plurality of pixel groups, each of which electrically connects a plurality of sensing electrodes to a plurality of coupling electrodes, respectively; a plurality of first sensing-electrode switches for connecting the sensing electrodes to a voltage source; a plurality of second sensing-electrode switches for interconnecting the sensing electrodes contained in the pixel groups; a plurality of third sensing-electrode switches for interconnecting the pixel groups; and a plurality of coupling-electrode switches for interconnecting the coupling electrodes contained in all pixel groups. Therefore, the fingerprint sensor blocks or corrects capacitance generated by internal components of a fingerprint sensor, such that it acquires a high-quality fingerprint image. Also, the fingerprint sensor corrects or reduces the influence of the dry or moist state of a finger surface, such that a fingerprint image can be more uniformly indicated.

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patent: 2004/0129787 (2004-07-01), Saito et al.
patent: 2004/0217781 (2004-11-01), Bird
Jung et al., “A Low-Power and High-Performance CMOS Fingerprint Sensing and Encoding Architecture,” IEEE Journal of Solid-State Circuits, vol. 34, No. 7, Jul. 1999.
Lee et al., “A 500dpi Capacitive-Type CMOS Fingerprint Sensor with Pixel-Level Adaptive Image Enhancement Scheme,” ISSCC 2002, Session 21, TD: Sensors and Microsystems, IEEE International Solid-State Circuits Conference, 2002.

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