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Sensors 2018, 18(1), 293;

Transparent Fingerprint Sensor System for Large Flat Panel Display

Ulsan National Institute of Science and Technology, School of Electrical & Electronic Engineering, Ulsan 44919, Korea
Electronics and Telecommunications Research Institute, Reality Device Research Division, Daejeon 34129, Korea
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)
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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)

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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.

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