Next Article in Journal
Mechanical Structural Design of a MEMS-Based Piezoresistive Accelerometer for Head Injuries Monitoring: A Computational Analysis by Increments of the Sensor Mass Moment of Inertia
Previous Article in Journal
Multi-Sensor Data Integration Using Deep Learning for Characterization of Defects in Steel Elements
Article Menu
Issue 1 (January) cover image

Export Article

Open AccessArticle
Sensors 2018, 18(1), 293; https://doi.org/10.3390/s18010293

Transparent Fingerprint Sensor System for Large Flat Panel Display

1
Ulsan National Institute of Science and Technology, School of Electrical & Electronic Engineering, Ulsan 44919, Korea
2
Electronics and Telecommunications Research Institute, Reality Device Research Division, Daejeon 34129, Korea
3
CrucialTec, Pankyo 13486, Korea
*
Author to whom correspondence should be addressed.
Received: 27 November 2017 / Revised: 15 January 2018 / Accepted: 16 January 2018 / Published: 19 January 2018
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [11117 KB, uploaded 19 January 2018]   |  

Abstract

In this paper, we introduce a transparent fingerprint sensing system using a thin film transistor (TFT) sensor panel, based on a self-capacitive sensing scheme. An armorphousindium gallium zinc oxide (a-IGZO) TFT sensor array and associated custom Read-Out IC (ROIC) are implemented for the system. The sensor panel has a 200 × 200 pixel array and each pixel size is as small as 50 μm × 50 μm. The ROIC uses only eight analog front-end (AFE) amplifier stages along with a successive approximation analog-to-digital converter (SAR ADC). To get the fingerprint image data from the sensor array, the ROIC senses a capacitance, which is formed by a cover glass material between a human finger and an electrode of each pixel of the sensor array. Three methods are reviewed for estimating the self-capacitance. The measurement result demonstrates that the transparent fingerprint sensor system has an ability to differentiate a human finger’s ridges and valleys through the fingerprint sensor array. View Full-Text
Keywords: fingerprint; transparent; a-IGZO thin film transistors (TFTs); sensor array; readout integrated circuit (ROIC) fingerprint; transparent; a-IGZO thin film transistors (TFTs); sensor array; readout integrated circuit (ROIC)
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

Seo, W.; Pi, J.-E.; Cho, S.H.; Kang, S.-Y.; Ahn, S.-D.; Hwang, C.-S.; Jeon, H.-S.; Kim, J.-U.; Lee, M. Transparent Fingerprint Sensor System for Large Flat Panel Display. Sensors 2018, 18, 293.

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