Open AccessMoiré-free fingerprint sensors based on multilayer oxide-metal-oxide electrodes
Author(s) -
Eun−Hyoung Cho,
Hyun Joon Kim,
Bon Won Koo,
Seog Woo Hong,
Won Seok Jung,
Haesung Kim,
Hong Suk Kim,
Soonwan Chung,
YongSung Kim,
Byung-Kyu Lee,
Chang Seung Lee
Publication year - 2018
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.024973
Subject(s) - materials science , moiré pattern , electrode , interference (communication) , fingerprint (computing) , transmittance , optics , optoelectronics , oxide , fingerprint recognition , layer (electronics) , computer science , nanotechnology , artificial intelligence , channel (broadcasting) , physics , computer network , chemistry , metallurgy
The display quality of touchscreen devices with on-screen fingerprint sensors is reduced by moiré patterns, interference phenomena caused by an overlap between the pixel pattern of the display, and the electrode pattern of the fingerprint sensor. A promising strategy for resolving this issue is to reduce the visibility of the moiré pattern, by including a filling layer with a transmittance similar to that of the electrodes, between the different patterns. We propose a moiré-free fingerprint sensor that uses an oxide-metal-oxide (IZO/Ag/IZO) multilayer as a highly transparent electrode. To verify the moiré reduction effect, we conducted a two-dimensional spectral analysis to calculate the spatial frequencies of the superimposed image of the display and the sensor patterns, and demonstrated experimentally that the proposed electrode greatly reduces the undesirable moiré phenomenon.