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A conformable imager for biometric authentication and vital sign measurement 

Tomoyuki Yokota 1*, Takashi Nakamura2, Hirofumi Kato3, Marina Mochizuki2, Masahiro Tada2,
Makoto Uchida2, Sunghoon Lee1, Mari Koizumi1, Wakako Yukita1, Akio Takimoto4 and
Takao Someya 1*
1)Department of Electrical Engineering and Information Systems, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo, Japan. 
2)Japan Display Inc., Mobara-shi, Chiba, Japan. 
3)Japan Display Inc., Ebina-shi, Kanagawa, Japan. 
4)Japan Display Inc., Minato-ku, Tokyo, Japan.
Reference: Nature Electronics volume 3, pages113–121(2020)

Abstract

  • a combination of polycrystalline silicon thin-film transistor readout circuits and organic photodiodes with high sensitivity in the near-infrared region can be used to create a conformable imager with a resolution of 508 pixels per inch, a speed of 41 frames per second and a total thickness of only 15 μm.     
  • The imager can read out a photocurrent of less than 10 pA with low noise, and can obtain static biometric signals, including images of fingerprints and veins, via soft contact with the skin. It can also be used to map a pulse wave, electronically selecting the best measurement location by analysing the area distribution

Materials & Devices

 

Figure reference : Nature Electronics volume 3, pages113–121(2020)

 

PMDPP3T, organic photodiodes, OPD, near-infrared