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Biologically Inspired Ultrathin Contact Imager for High‐Resolution Imaging of Epidermal Ridges on Human Finger
Author(s) -
Jang KyungWon,
Kim Kisoo,
Bae SangIn,
Jeong KiHun
Publication year - 2021
Publication title -
advanced materials technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.184
H-Index - 42
ISSN - 2365-709X
DOI - 10.1002/admt.202100090
Subject(s) - microlens , materials science , stereo imaging , optics , contact lens , image sensor , resolution (logic) , lens (geology) , high resolution , image resolution , optoelectronics , computer science , artificial intelligence , physics , remote sensing , geology
Compound eyes exhibit compelling vision schemes due to their unique visual ultrastructures. Here, a biologically inspired ultrathin contact imager (BUCI) for high‐resolution contact fingerprint imaging is reported. The BUCI contains ultrathin arrayed camera, light‐emitting diode arrays, and light guide plate (LGP). The ultrathin arrayed camera is fully packaged with microlens arrays, variable micropinhole arrays (MLA‐VMA), and a single complementary metal oxide semiconductor image sensor. The ultrathin arrayed camera shows a large field of view of 77.3° and a constant MTF50 of 89.4 cycles mm –1 , relatively higher than a comparable single lens camera at the distance less than 36.8 mm. The channel images of a human fingertip are directly obtained by using frustrated total internal reflection and stitched to a single and high‐resolution full‐field image for a fingertip of 5.7 mm × 4.9 mm. The BUCI provides a new platform for high‐resolution contact imaging in biometric or healthcare applications.