Capacitive fingerprint sensor and the panel thereof

Details Capacitive fingerprint sensor and the panel thereof Capacitive fingerprint sensor and the panel thereof

2007-12-06

2010-02-16

Dole, Timothy J (Department: 2831)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S662000, C382S124000, C702S104000

Reexamination Certificate

active

07663380

ABSTRACT:
A capacitive fingerprint sensor comprises a fingerprint capacitor, a reference capacitor, a first transistor, a second transistor, a third transistor and a fourth transistor. The fingerprint capacitor CFhas a capacitance that is either a valley capacitance CFVor a ridge capacitance CFR. The reference capacitor CShas a capacitance CS, and CFV<CS<CFR. The first transistor is configured to precharge the reference capacitor. The second transistor is configured to precharge the fingerprint capacitor. The third transistor is configured to redistribute the charges of the reference capacitor and fingerprint capacitor. The fourth transistor is configured to output the voltage of the reference capacitor after redistribution.

REFERENCES:
patent: 6049620 (2000-04-01), Dickinson et al.
patent: 6906529 (2005-06-01), Blanchard
patent: 7062075 (2006-06-01), Morimura et al.
patent: 7075316 (2006-07-01), Umeda et al.
patent: 7099497 (2006-08-01), Chou et al.
patent: 7208961 (2007-04-01), Miyasaka
patent: 7453270 (2008-11-01), Hargreaves et al.
Hiroyuki, Hara, et al, Low Temperature Polycrystalline Silicon TFT Fingerprint Sensor with Integrated Comparator Circuit, 2004, pp. 403-406.
H. Hara, et al, A Capacitive Fingerprint Sensor with Integrated Comparator Based on Lips TFTs, 2006, pp. 257-260.

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