(a) FEM model design of a half of the folding window module at the final state after folding at 90° and (b) the results of FEM analysis and range of adhesive tolerance with respect to occurred stress at the folding window module; (c) the change in the relative brightness during 10⁵ cycles of folding-unfolding test with L (3 mm) and t (0.7 mm) in the green region in (b).

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