Capacitive fingerprint sensor

Details Capacitive fingerprint sensor Capacitive fingerprint sensor

2006-08-29

2006-08-29

Miriam, Daniel (Department: 2624)

Image analysis

Applications

Personnel identification

Reexamination Certificate

active

07099497

ABSTRACT:
A capacitive fingerprint sensor includes a plurality of capacitive sensing members arranged in a 2D array. A charge-sharing principle is utilized to read signals in the capacitive sensing member. Each capacitive sensing member includes an insulating surface layer, a sense electrode, a reference electrode, a reference capacitor, and a signal reading circuit. The sense electrode is below the insulating surface layer. When a finger contacts the insulating surface layer, a sense capacitor is formed therebetween. The reference capacitor is connected between the reference and sense electrodes. The signal reading circuit is connected to the sense and reference electrodes, repeatedly provides control signals to charge the reference capacitor and then enable the reference and sense capacitor to share charges. Finally, the sense voltage of the sense electrode may be read.

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Lee, et al. “A 600-dpi capacitive fingerprint sensor chip and image-synthesis technique”, IEEE, pp. 469-475, 1999.

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