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Sensors 2017, 17(10), 2280;

A Method for Enhancing the Sensing Distance of a Fingerprint Sensor

College of Information and Communication Engineering, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 16419, Korea
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)
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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

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

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