Electrochromic displays have been the subject of extensive research as a promising colour display technology. The current state-of-the-art inorganic multicolour electrochromic displays utilize nanocavity structures that sacrifice transparency and thus limit their diverse applications. Herein, we demonstrate a transparent inorganic multicolour display platform based on Zn-based electrochromic devices. These devices enable independent operation of top and bottom electrochromic electrodes, thus providing additional configuration flexibility of the devices through the utilization of dual electrochromic layers under the same or different colour states. Zn–sodium vanadium oxide (Zn–SVO) electrochromic displays were assembled by sandwiching Zn between two SVO electrodes, and they could be reversibly switched between multiple colours (orange, amber, yellow, brown, chartreuse and green) while preserving a high optical transparency. These Zn–SVO electrochromic displays represent the most colourful transparent inorganic-based electrochromic displays to date. In addition, the Zn–SVO electrochromic displays possess an open-circuit potential (OCP) of 1.56 V, which enables a self-colouration behaviour and compelling energy retrieval functionality. This study presents a new concept integrating high transparency and high energy efficiency for inorganic multicolour displays.

电致变色显示器作为一种有前景的彩色显示技术已成为广泛研究的主题。目前最先进的无机多色电致变色显示器采用纳米腔结构，牺牲了透明度，从而限制了其多样化的应用。在这里，我们展示了一种基于锌基电致变色器件的透明无机多色显示平台。这些器件能够实现顶部和底部电致变色电极的独立操作，从而通过在相同或不同颜色状态下利用双电致变色层来提供器件的额外配置灵活性。锌-钠钒氧化物（Zn-SVO）电致变色显示器是通过将Zn夹在两个SVO电极之间组装而成的，它们可以在多种颜色（橙色、琥珀色、黄色、棕色、黄绿色和绿色）之间可逆地切换，同时保持高光学透明度。这些 Zn-SVO 电致变色显示器代表了迄今为止色彩最丰富的透明无机电致变色显示器。此外，Zn-SVO电致变色显示器具有1.56 V的开路电位（OCP），可实现自着色行为和引人注目的能量回收功能。这项研究提出了一种将高透明度和高能效结合起来的无机多色显示器的新概念。