A Visual and Electric Dual-Mode Flexible Electrochromic Perception Device with Semiquantitative Monitoring for Human Motion

Intelligent electrochromic perception devices can effectively address the issue of nonintuitive monitoring of human motion signals to improve the functionality and user experience of wearable perception devices. However, challenges such as dual-mode monitoring and durability of the device still remain. Herein, a novel flexible electrochromic perception device with excellent electrochromic stability and reliable electrical signal monitoring is assembled to realize semiquantitative visual and electric dual-mode monitoring of human motion pressure for the first time. To achieve high-performance monitoring, the Li⁺-doped hybrid hydrogel serves as the electrolyte of the device to optimize energy dissipation, enhance electrochemical stability, and enable rapid color switching of the device. During perception of finger bending, thigh joint movement, and plantar pressure, the device enables semiquantitative monitoring of the relative capacitance and color switching between green and transparent at 0.6 V, and the perception mechanism is revealed by finite element method simulations. Furthermore, it also realizes microjoint movement monitoring by detecting the changes in the relative resistance and exhibits relative capacitance monitoring under various bending angles. The proposed strategy provides new ideas and significant prospects for designing intuitive and accurate flexible perception devices for human motion monitoring.