Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 32, Issue 22, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202113299
Keywords
auxetic metamaterials; kirigami; micro-LED display; Poisson's ratio; stretchable display
Categories
Funding
- Center for Advanced Meta-Materials (CAMM) - Ministry of Science, ICT and Future Planning as a Global Frontier Project [2014063701, 2014063700]
- Korea Institute of Machinery and Materials [NK230D]
- National Research Council of Science & Technology (NST), Republic of Korea [NK230D] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Mechanical metamaterials, especially auxetic metamaterials with negative Poisson's ratios, allow for stretchable displays without image distortion. The meta-display, incorporating micro-LEDs and a kirigami-based auxetic circuit board, overcomes the challenges of large stretchability, high deformation uniformity, and low image distortion. It demonstrates a stretchability of 24.5%, Poisson's ratio of -1, and no image distortion under uniaxial stretching.
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.
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