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Transparent Fingerprint Sensor System for Large Flat Panel Display.

Wonkuk Seo1, Jae-Eun Pi2, Sung Haeung Cho3

  • 1Ulsan National Institute of Science and Technology, School of Electrical & Electronic Engineering, Ulsan 44919, Korea. stepkr@unist.ac.kr.

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Summary
This summary is machine-generated.

This study presents a transparent fingerprint sensor using amorphous indium gallium zinc oxide (a-IGZO) thin-film transistor (TFT) technology. The novel system effectively captures fingerprint ridge and valley details via a self-capacitive sensing mechanism.

Keywords:
a-IGZO thin film transistors (TFTs)fingerprintreadout integrated circuit (ROIC)sensor arraytransparent

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Biometrics

Background:

  • Traditional fingerprint sensors often lack transparency and can be bulky.
  • Integrating sensing capabilities into transparent surfaces presents a significant technological challenge.

Purpose of the Study:

  • To develop and demonstrate a transparent fingerprint sensing system.
  • To utilize amorphous indium gallium zinc oxide (a-IGZO) thin-film transistor (TFT) technology for high-resolution fingerprint imaging.

Main Methods:

  • Implementation of a 200x200 pixel a-IGZO TFT sensor array with 50 μm x 50 μm pixels.
  • Development of a custom Read-Out Integrated Circuit (ROIC) featuring analog front-end (AFE) amplifiers and a successive approximation analog-to-digital converter (SAR ADC).
  • Employing a self-capacitive sensing scheme that measures capacitance between a finger and pixel electrodes through a cover glass.

Main Results:

  • The ROIC successfully senses capacitance variations corresponding to fingerprint ridges and valleys.
  • Measurement results confirm the system's ability to differentiate fine details of a human fingerprint.
  • The transparent sensor panel achieved high-resolution imaging capabilities.

Conclusions:

  • A functional transparent fingerprint sensing system based on a-IGZO TFT technology has been successfully developed.
  • The self-capacitive sensing approach is viable for transparent biometric applications.
  • This technology offers potential for seamless integration into various surfaces for enhanced security.