Bidirectional Zero Poisson's Ratio Elastomers with Self‐Deformable Soft Mechanical Metamaterials for Stretchable Displays

Author:

Choi Jun‐Chan12,Jeong Hoon Yeub12,Sun Jae‐Hong2,Byun Junghwan2,Oh Jeongtaek3,Hwang Seok Joon45,Lee Phillip45,Lee Dong Won6,Son Jeong Gon26,Lee Seunghyun3,Chung Seungjun1ORCID

Affiliation:

1. School of Electrical Engineering Korea University Seoul 02841 Republic of Korea

2. Soft Hybrid Materials Research Center Korea Institute of Science and Technology Seoul 02792 Republic of Korea

3. Department of Mechanical System Design Engineering Seoul National University of Science and Technology Seoul 01811 Republic of Korea

4. Advanced Photovoltaics Research Center Korea Institute of Science and Technology Seoul 02792 Republic of Korea

5. Division of Nano and Information Technology University of Science and Technology Seoul 02792 Republic of Korea

6. KU‐KIST Graduate School of Converging Science and Technology Korea University Seoul 02841 Republic of Korea

Abstract

AbstractStretchable displays, capable of reversible expansion, represent significant advancements in free‐form display technologies. However, the high Poisson's ratio (ν) of elastomer substrates leads to unintended deformation under tensile strain, resulting in image warping. To address this, a meta‐elastomer (ME) substrate with a bidirectional zero ν, incorporating a self‐deformable soft mechanical metamaterial (MM) frame, is introduced. The ν of the ME is precisely programmed by the interaction between the deformation of the MM frame, which exhibits a negative ν, and the elastomer matrix, which has a positive ν. The soft MM frame, stiffer than the elastomer matrix, undergoes both structural deformation and length alteration during substrate tensile strain. This synergistic effect enables achieving a nearly bidirectional zero ν, thus overcoming the limitations of conventional tessellated rigid MM composites. Furthermore, the ME substrate, which is chemically cross‐linked at the junction interface, demonstrates exceptional mechanical robustness, enduring over 180% stretching and more than 10 000 cycles. By counteracting the Poisson's effect, the ME substrate with an integrated pixel array ensures translational pixel movement along the tensile axis during bidirectional stretching, minimizing undesired pixel movement in other directions. The stretchable ME presents key advancements for implementing more stable and reliable stretchable display applications.

Funder

National Research Foundation of Korea

Ministry of Science and ICT, South Korea

Publisher

Wiley

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