A Method for Enhancing the Sensing Distance of a Fingerprint Sensor

In this paper, we describe a method for improving the quality of fingerprint images at long sensing distances by reducing the fringe capacitance formed between a pixel and surrounding fingerprint patterns. Air-walls were applied to the glass attached to a fingerprint sensor for reducing the edge cap...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2017-10, Vol.17 (10), p.2280
Main Authors: Song, Kyung-Hoon, Choi, Jaehuk, Chun, Jung-Hoon
Format: Article
Language:English
Subjects:
Capacitance
capacitive fingerprint sensor
Computer simulation
fingerprint image enhancement
fingerprint recognition
Fingerprinting
Fingerprints
Image quality
Sensors
Three dimensional analysis
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Summary:In this paper, we describe a method for improving the quality of fingerprint images at long sensing distances by reducing the fringe capacitance formed between a pixel and surrounding fingerprint patterns. Air-walls were applied to the glass attached to a fingerprint sensor for reducing the edge capacitance. Fingerprints and air-wall structures were modeled using a three-dimensional capacitance analysis tool. A prototype was fabricated by stacking glass layers with air-walls with a depth of 50 μm and a pitch of 50 μm on a silicon-type capacitive sensor. Using the results of simulations and prototype experiments, we confirmed that the proposed air-wall structure achieved high enough resolution to distinguish 2.5-lp/mm fingerprint patterns at a sensing distance of 300 μm or longer, and its contrast improved from 0.59 to 0.98.
ISSN:1424-8220
1424-8220
DOI:10.3390/s17102280