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Schematic of the cross‐sectional view of the optical ray diagrams consisting of OLED and OPD. a) Substrate (PET) is optically coupled to the skin. b) Substrate with non‐conformal contact is not optically coupled with the skin, as it creates an air gap between the skin and the substrate. Reproduced with permission.[ 81 ] Copyright 2018, American Association for the Advancement of Science.
