The bending reliability is the key characteristic of foldable organic light‐emitting diode (OLED) panel. In the bending process of foldable OLED panel module, display supporting layer crack and optically clear adhesive (OCA) layer peeling issue often occur. In this study, a periodic pattern supporting layer is designed to solve the peeling and crack issue. The finite element method for simulating the foldable panel was constructed to investigate the correlation between the dimensions of the periodic pattern substructure and the crack stress. The results show that the periodic pattern substructure can decrease the modulus of the bending zone, which can significantly improve the flexibility of the supporting layer. It makes the deformations of OCA to be coordinated during the bending process, thus effectively reducing the peeling issue. In addition, the crack stress values of the periodic pattern substructure directly rely on its dimensions. It indicates that a proper design of the pattern substructure and feature dimensions is important to improve the bending reliability of the OLED panel.
In this paper, an auto-tuning piezoelectric energy harvester (PEH) based on the cantilever plate is presented by attaching a box to each corner of the free sides and placing a ball in each box. The prototype and supporting experimental fixtures were designed and manufactured. A series of hammering experiments are carried out to measure the natural frequency of the device according to different whole centroid position of the two balls. Seven excitation frequencies are selected to perform auto-tuning experiments, respectively. The two balls roll automatically to make the natural frequency of the structure consistent with the excitation, thereby resonating. The device is subjected to sweeping experiments. It can be seen from open circuit voltagefrequency and power-frequency diagrams that the auto-tuning PEH has a wider work frequency band as TFB and outputs higher voltage and power compared to cases where balls are fixed.
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