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A Novel Fingerprint Sensing Technology Based on Electrostatic Imaging.

Kai Tang1, Aijia Liu2, Wei Wang3

  • 1State Key Laboratory of Mechatronics Engineering and Control, Beijing Institute of Technology, Beijing 100081, China. tangkai01@bit.edu.cn.

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|September 15, 2018
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Summary
This summary is machine-generated.

A novel electrostatic imaging fingerprint sensor enhances detection distance by 46%. This technology improves durability and enables under-display fingerprint recognition for full-screen mobile designs.

Keywords:
MEMSelectrostatic imagingelectrostatics fieldfingerprint sensing

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Area of Science:

  • Sensor Technology
  • Biometrics
  • Micro-Electro-Mechanical Systems (MEMS)

Background:

  • Existing capacitive fingerprint sensors have limited detection distances, making them prone to damage from thin protective coatings.
  • This limitation hinders integration into full-screen mobile phone designs requiring under-display sensors.

Purpose of the Study:

  • To introduce a new fingerprint sensing technology utilizing electrostatic imaging.
  • To enhance fingerprint detection distance and overcome limitations of current capacitive sensors.
  • To enable under-display sensor placement for modern mobile device aesthetics.

Main Methods:

  • Analysis of electric field distribution around fingerprints.
  • Design of an electrostatic imaging sensor based on electrostatic detection principles and MEMS technology.
  • Development of MEMS electrostatic imaging array and associated analog/digital signal processing circuits.

Main Results:

  • The proposed electrostatic imaging technology significantly increases fingerprint recognition distance.
  • Achieved a 46% increase in sensing distance compared to existing capacitive fingerprint sensing technology.
  • Demonstrated a sensing distance exceeding 439 μm in simulations and prototype tests.

Conclusions:

  • Electrostatic imaging-based fingerprint sensing offers a viable solution for improved performance and durability.
  • The technology supports under-display integration, meeting the demands of full-screen smartphone designs.
  • This advancement provides a more robust and versatile fingerprint recognition system.