1. Transparent Fingerprint Sensor System for Large Flat Panel Display.
- Author
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Seo, Wonkuk, Pi, Jae-Eun, Cho, Sung Haeung, Kang, Seung-Youl, Ahn, Seong-Deok, Hwang, Chi-Sun, Jeon, Ho-Sik, Kim, Jong-Uk, and Lee, Myunghee
- Subjects
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HUMAN fingerprints , *FLAT panel displays , *THIN film transistors , *SENSOR arrays , *SELF-capacitance , *ZINC oxide - 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. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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