Fig. 4.

Technologies for electrochromic displays. a Assembly configuration of an electrochromic display and material for each part. b Photographs of an electrochromic glasses at − 1.0 V and + 1.0 V with brown blend of orange and periwinkle. c (i) Photographs for three different states of an electrochromic gel: bleached at 0.00 V, blue at − 0.70 V and red at − 0.80 V. (ii) Transient profiles in optical properties with constant applied voltages

(Figure reproduced from a [28], Copyright 2015, The Author(s); b [30], Copyright 2015, American Chemical Society; c [31], Copyright 2016, American Chemical Society)