Electrochromic Displays Having Two‐Dimensional CIE Color Space Tunability

Abstract

Electrochromic devices with a wide color gamut distribution have long been sought after for non-emissive display technologies. The current state-ofthe-art multicolor electrochromic displays utilize a single electrochromic layer, which restricts their color tunability within a linear or curved segment scope in International Commission on Illumination (CIE) color space and thus leads to limited color hues. Herein, it is demonstrated vivid electrochromic displays with broadened color hues via fabricating Zn-based multicolor electrochromic displays having 2D CIE color space tunability. In addition, it is revealed that a Fabry-Perot nanocavity structure can further tune the color hues via altering the coordinate of the 2D CIE color space. It is known that this is the first demonstration of 2D CIE color space tunability realization from a single transparent or reflective electrochromic device. These findings represent a novel strategy for fabricating multicolor electrochromic displays and are expected to advance the development of electrochromic displays.

Recent Advances in Inorganic Electrochromic Materials from Synthesis to Applications: Critical Review on Functional Chemistry and Structure Engineering

“…Copyright 2020, the Springer Nature. (e) Schematic illustration of a hybrid Zn−SVO−WO3/W electrochromic display [83] . Copyright 2022, Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim.…”

“…Except for the optimized optical characteristics, this category of ECDs can also provide the service of energy storage and recovery. [83] Then, they further coupled optical interference and electrochromism into a single structure by introducing W (a current collector and a reflective layer) and WO 3 (the high index of refraction coating) in SVOÀ Zn system (Figure 5e). the SVOÀ ZnÀ W/WO 3 ECDs with dual EC electrodes can acquire the 2D enclosed area formed by the 16 representative chromaticity coordinates in the International Commission on Illumination (CIE) color space.…”

“…Benefiting from the color overlay strategy, this device can realize six different colors (i. e., green, chartreuse, brown, yellow, amber and orange), which is far more than the three colors of traditional EC displays. Except for the optimized optical characteristics, this category of ECDs can also provide the service of energy storage and recovery [83] . Then, they further coupled optical interference and electrochromism into a single structure by introducing W (a current collector and a reflective layer) and WO 3 (the high index of refraction coating) in SVO−Zn system (Figure 5e).…”

“…the SVOÀ ZnÀ W/WO 3 ECDs with dual EC electrodes can acquire the 2D enclosed area formed by the 16 representative chromaticity coordinates in the International Commission on Illumination (CIE) color space. [83] Additionally, as a way for practical application, Zhong et al [15] achieved a self-powered and color-indicated system by combining solid-state electrochromic asymmetric supercapacitors (ASCs) with commercial solar cell panels, where the system was in several typical states (i. e., uncharged, fully charged, powering the red LED and fully discharged), shown in Figure 5d (right). In particular, they Put forward a new idea of smart sunglasses (Figure 5f, left) with a solar cell panel, Bluetooth headsets and two WO 3 -PANI windows, where the solar cell panel could drive the ASC to dark blue and power the Bluetooth headsets when the smart sunglasses were exposed to sunlight.…”

“…(e) Schematic illustration of a hybrid ZnÀ SVOÀ WO3/W electrochromic display. [83] Copyright 2022, Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. (f) Concept of a new kind of smart sunglasses consisting of two WO 3 -PANI windows, a solar cell panel, and bluetooth headsets, and digital photos of the ASC window in the self-powered system when (1) uncharged (light green); (2) fully charged (dark blue); (3) powering the red LED; and (4) fully discharged (back to light green again).…”