While today's display technology is mainly based on rigid-based substrate, flexible display technology has been
significantly growing since the last decade. However, Flexible displays are susceptible to many types of stresses during
processing and usage. Thin films on flexible substrate are sensitive to ambient conditions. Therefore devices are usually
laminated with a protective layer. In this study high cyclic bending fatigue experiments were conducted on 2000 oA thick
copper thin films sputter deposited on 127 μm polyethylene terephthalate (PET) substrate laminated with another 127 μm
PET layer. High magnification images were used to observe crack initiation and propagation in the thin film layer. Initial
results showed a great influence of laminate layer on stress reduction in the thin film. Furthermore, a lamination layer
causes cracks to spread out on a larger area with fine cracks and therefore reduce the chance of the cracks to meet and
grow.
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