Rotating square tessellations enabled stretchable and adaptive curved display

IF 12.3 1区 材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC npj Flexible Electronics Pub Date : 2024-01-06 DOI:10.1038/s41528-023-00291-y
Yang Deng, Kuaile Xu, Rui Jiao, Weixuan Liu, Yik Kin Cheung, Yongkai Li, Xiaoyi Wang, Yue Hou, Wei Hong, Hongyu Yu
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Abstract

Curved displays can adjust their shape to accommodate different objects and are used in electronics and decorative lighting. Due to the immutable pixel spacing, existing commercial curved displays are flexible but not compatible with undevelopable surfaces. Inspired by kirigami and auxetic structures, we propose an approach that combines luminescent elements and rotating square tessellations to create a stretchable, arbitrary curve adaptive display. We connect square islands by vertical interconnects to relieve the stress concentration and provide extra deformation patterns. The vertical interconnects are patterned on a flexible printed circuit board (FPCB) using laser cutting and folded up via specially designed molds. Further, the freed-up space by folded interconnects allows the structure to be compressed. A prototype stretchable display is demonstrated that it can maintain electrical performance under biaxial strain and adapt to different Gaussian curvature surfaces, including cylindrical, spherical, saddle and arbitrary surfaces. Theoretical models and finite element calculations are established to describe the tensile behavior of the structures under different boundary conditions and agree with the experimental results. This proposed technology paves a feasible solution of mass production of adaptive curved displays and sets the trend for the next-generation display.

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旋转方格网实现了可拉伸和自适应曲面显示器
曲面显示器可以调整形状以适应不同的物体,并被用于电子产品和装饰照明。由于像素间距不可改变,现有的商用曲面显示器虽然灵活,但与不可开发的表面不兼容。受叽里格米和辅助结构的启发,我们提出了一种将发光元件和旋转方形棋盘格结合起来的方法,以创建一种可拉伸的任意曲线自适应显示器。我们通过垂直互连将方形岛屿连接起来,以缓解应力集中并提供额外的变形模式。通过激光切割在柔性印刷电路板(FPCB)上绘制垂直互连图案,然后通过专门设计的模具折叠起来。此外,通过折叠互连器件释放出的空间可以对结构进行压缩。实验证明,拉伸显示器原型能在双轴应变下保持电气性能,并能适应不同的高斯曲率表面,包括圆柱形、球形、马鞍形和任意表面。建立的理论模型和有限元计算描述了结构在不同边界条件下的拉伸行为,并与实验结果一致。这项技术为自适应曲面显示器的批量生产提供了可行的解决方案,为下一代显示器的发展指明了方向。
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来源期刊
CiteScore
17.10
自引率
4.80%
发文量
91
审稿时长
6 weeks
期刊介绍: npj Flexible Electronics is an online-only and open access journal, which publishes high-quality papers related to flexible electronic systems, including plastic electronics and emerging materials, new device design and fabrication technologies, and applications.
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