A 600-dpi capacitive fingerprint sensor chip and image-synthesis technique

Author

Lee, Jeong-Woo ; Min, Dong-Jin ; Kim, Jiyoun ; Kim, Wonchan

Author_Institution

Integrated Syst. Lab., Seoul Nat. Univ., South Korea

Volume

34

Issue

4

fYear

1999

fDate

4/1/1999 12:00:00 AM

Firstpage

469

Lastpage

475

Abstract

This paper examines the possibility of a low-cost, high-resolution fingerprint sensor chip. The test chip is composed of 64×256 sensing cells (chip size: 2.7×10.8 mm²). A new detection circuit of charge sharing is proposed, which eliminates the influences of internal parasitic capacitances. Thus, the reduced sensing-capacitor size enables a high resolution of 600 dpi, even using a conventional 0.6 μm CMOS process. The partial fingerprint images captured are synthesized into a full fingerprint image with an image-synthesis algorithm. The problems and possibilities of this image-synthesis technique are also analyzed and discussed

Keywords

CMOS image sensors; capacitive sensors; fingerprint identification; 0.6 micron; CMOS process; capacitive fingerprint sensor chip; charge sharing; chip size; detection circuit; image-synthesis technique; internal parasitic capacitances; partial fingerprint images; resolution; Capacitance; Capacitive sensors; Capacitors; Circuit synthesis; Costs; Electrodes; Fingerprint recognition; Image matching; Image sensors; Skin;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.753679

Filename

753679