Optoelectronic Dual Mode Encryption for High Security Biometric Identification

Optoelectronic dual-mode devices overcome the environmental sensitivity and flexibility limitations of single-mode systems through co-design, yet face challenges in synchronizing touch/display signals and heterogeneous integration. This study presents a self-powered dual-mode encryption device via cross-modal integration of an electrochromic display module and a piezoresistive sensing array. Ion self-migrating electrochromic ink and a liquid metal substrate form a self-powered display unit, eliminating circuit coupling interference. Interfacial charge transfer enables ultrafast coloration (460 ms), precisely matching the sub-second response of the piezoresistive array. A 1024-unit high-density pressure-sensing array with interfacial microengineering exhibits highly consistent parallel signals, reconstructing complex pressure distributions. A multimodal deep learning algorithm achieves cross-domain correlation analysis of optical/electrical features, reducing biometric error rates from 11.97% and 38.19% (single-mode) to 5.36%. This work breaks single-mode physical constraints and provides a device and algorithm co-design solution for multi-physics encryption systems.