fig6

Figure 6. Recent advances in active layers pattern design. (A) The printing process of flexible ECD using a patterned PVC sheet. Reproduced with permission^[66]. Copyright 2023, ACS Publications; (B) Device structure with a screen-printed PVA layer template for forming the MBI patterning with in-situ electrochemical processing. Reproduced with permission^[62]. Copyright 2024, Elsevier; (C) Schematic illustration of flexible ECD based on the patterned EC gel using a patterned photoresist template. Reproduced with permission^[73]. Copyright 2016, ACS Publications; (D) Schematic illustration of fabricating the multicolor display with pixelated EC gel. Reproduced with permission^[94]. Copyright 2020, Elsevier; (E) PEDOT:Tos pattern with gradients by using the greyscale picture as the UV photomask. Reproduced with permission^[95]. Copyright 2019, MDPI. ECD: Electrochromic display; PVC: polyvinyl chloride; PVA: polyvinyl alcohol; MBI: 1-methyl-4,4’-bipyridyl iodide; EC: electrochromic; PEDOT:Tos: poly(3,4-ethylenedioxythiophene) with tosylate; UV: ultraviolet.