npj Flexible Electronics ( IF 12.3 ) 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
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.
中文翻译:
旋转方形镶嵌可实现可拉伸和自适应弯曲显示
曲面显示器可以调整其形状以适应不同的物体,并用于电子和装饰照明。由于像素间距不变,现有的商用曲面显示器具有柔性,但与不可开发的表面不兼容。受剪纸和拉胀结构的启发,我们提出了一种将发光元素和旋转方形镶嵌相结合的方法,以创建可拉伸的任意曲线自适应显示。我们通过垂直互连连接方形岛,以减轻应力集中并提供额外的变形模式。使用激光切割在柔性印刷电路板 (FPCB) 上形成垂直互连图案,并通过专门设计的模具折叠起来。此外,通过折叠互连释放的空间允许压缩结构。原型可拉伸显示器被证明可以在双轴应变下保持电气性能,并适应不同的高斯曲率表面,包括圆柱形、球形、鞍形和任意表面。建立了理论模型和有限元计算来描述不同边界条件下结构的拉伸行为,并与实验结果相一致。这项技术为自适应曲面显示器的量产提供了可行的解决方案,并为下一代显示器树立了趋势。