Next Article in Journal
Novel Semi-Parametric Algorithm for Interference-Immune Tunable Absorption Spectroscopy Gas Sensing
Previous Article in Journal
Self-Taught Learning Based on Sparse Autoencoder for E-Nose in Wound Infection Detection
Article Menu
Issue 10 (October) cover image

Export Article

Open AccessArticle
Sensors 2017, 17(10), 2280; https://doi.org/10.3390/s17102280

A Method for Enhancing the Sensing Distance of a Fingerprint Sensor

1
College of Information and Communication Engineering, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 16419, Korea
2
Advanced Component Technology Group, Mobile Communication Division, Samsung Electronics Ltd., 129 Samsung-ro, Yeongtong-gu, Suwon, Gyeonggi-do 16677, Korea
*
Author to whom correspondence should be addressed.
Received: 1 September 2017 / Revised: 1 October 2017 / Accepted: 3 October 2017 / Published: 7 October 2017
(This article belongs to the Section Physical Sensors)
Full-Text   |   PDF [8812 KB, uploaded 12 October 2017]   |  

Abstract

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. View Full-Text
Keywords: capacitive fingerprint sensor; fingerprint recognition; fingerprint image enhancement capacitive fingerprint sensor; fingerprint recognition; fingerprint image enhancement
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Song, K.-H.; Choi, J.; Chun, J.-H. A Method for Enhancing the Sensing Distance of a Fingerprint Sensor. Sensors 2017, 17, 2280.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top