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Auxetic Meta‐Display: Stretchable Display without Image Distortion
Author(s) -
Jang Bongkyun,
Won Sejeong,
Kim Jaegu,
Kim Juho,
Oh Minsub,
Lee HakJoo,
Kim JaeHyun
Publication year - 2022
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202113299
Subject(s) - auxetics , materials science , metamaterial , distortion (music) , curvature , flexible display , perpendicular , poisson's ratio , display device , optics , optoelectronics , computer science , poisson distribution , composite material , geometry , mathematics , physics , amplifier , statistics , cmos , layer (electronics) , operating system , thin film transistor
Mechanical metamaterials possess unusual mechanical properties that cannot be found in nature. Auxetic metamaterials have negative Poisson's ratios and tend to expand in a direction perpendicular to the axial extension direction. When the Poisson's ratio of a display circuit board is forced to be −1 by adopting an auxetic metamaterial, a display can be stretchable without image distortion, and this display is called a meta‐display in this study. The critical obstacles to implementing a stretchable display are large stretchability, high deformation uniformity, and low image distortion. The meta‐display overcomes these obstacles by incorporating micro‐LEDs and a kirigami‐based auxetic circuit board. An auxetic meta‐display with a stretchability of 24.5%, Poisson's ratio of −1, and no image distortion under uniaxial stretching is demonstrated. Finally, the roll transfer process enabled the scaling‐up of a 3‐inch meta‐display attachable to surfaces with non‐zero Gaussian curvatures. This conformity to the non‐zero Gaussian curvature helps realize biomedical applications such as wearable display, phototherapy, and skincare.