Double-Side Digital Display Devices Based on the Solid-State Electrochromic Effect of the Amorphous WO<sub>3</sub> Thin Films

Abstract

A double-side digital display device has been fabricated based on the solid-state electrochromic effect of amorphous WO3 thin film in this article. The device simply consists of a transparent anode, a transparent cathode, an amorphous WO3 thin film and a solid electrolyte. The transparent electric wiring has been achieved by the electrochemical corrosion of the designed region of ITO (indium tin oxide) film. The amorphous WO3 thin film as an electrochromic layer is prepared on the ITO film by thermal evaporation deposition. The complex of polyethylene and LiClO4 as a solid electrolyte is used in the devices. This double-side digital display can work well under the normal mobile phone battery of 3.7 V, which is compatible with the traditional driven circuit technology. Our results prove the potential application of the amorphous WO3 thin film on the double-side display devices.