A. Alam, A. Hanna, R. Irwin, G. Ezhilarasu, Hyunpil Boo, Yuan Hu, C. Wong, T. Fisher, S. Iyer
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Heterogeneous Integration of a Fan-Out Wafer-Level Packaging Based Foldable Display on Elastomeric Substrate
We describe a Fan-Out Wafer-Level Packaging (FOWLP) integration process that is used to build an extremely flexible heterogeneous integration platform called "FlexTrateTM". We integrated a daisy chain connected 10×20 array of 1 mm2 Si dies over a 35 mm × 18 mm area using vertically corrugated Cu interconnects of 40 µm pitch and ~5 µm thickness. The system is reliable even upon bending to 1 mm bending radius for over 1000 bending cycles. We demonstrate a 37 mm × 52 mm foldable display with 1 mm2 InGaN LEDs using this technology. Cyclic mechanical bending (1 mm bending radius), optical, and thermal reliability of integrated display are investigated.
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