Optical fingerprint sensor with variable resistors

Details Optical fingerprint sensor with variable resistors Optical fingerprint sensor with variable resistors

2007-03-06

2007-03-06

Dang, Duy M. (Department: 2624)

Image analysis

Image sensing

C382S124000

Reexamination Certificate

active

10605005

ABSTRACT:
A fingerprint sensor for sensing a fingerprint has a detecting and processing circuit and a plurality of sensing units. Each of the sensing units has a switch element, a first resistor, and a second resistor. The switch element has a first terminal, a second terminal, and a third terminal. Resistance of the second resistor is fixed. The fingerprint influences an intensity of light illuminating the first resistor so that resistance of the first resistor and a voltage level of the second terminal change. When the switch elements are turned on, the detecting and processing circuit analyzes the fingerprint according to the voltage levels of the second terminals of the plurality switch elements.

REFERENCES:
patent: 5325442 (1994-06-01), Knapp
patent: 5778089 (1998-07-01), Borza
patent: 5991467 (1999-11-01), Kamiko
patent: 6011860 (2000-01-01), Fujieda et al.
patent: 377426 (1999-12-01), None
Jai II Ryu et al., “A Novel Amorphous Silicon Photoconductor Array”, Journal of the Korean Physical Society, Dec. 2001. pp. s264-s267, vol. 39.

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