Stretchable flexible circuit based on metal-liquid metal slip structure

Abstract

This invention provides a stretchable flexible circuit based on a metal-liquid metal sliding structure, belonging to the field of flexible electronics. It includes a flexible substrate, at least one conductive layer, an electronic component layer, and a flexible packaging layer, all arranged in a stacked configuration. The conductive layer comprises an alternating stack of metal and liquid metal layers. The metal layers consist of at least two groups, each containing multiple metal segments isolated by scribe lines. The projections of the metal segments from adjacent groups of metal layers perpendicular to the stacking direction are staggered, forming a sliding-like structure during stretching. The liquid metal layer fills the spaces between adjacent metal layers and the gaps between the metal segments. During stretching, this structure dissipates stress through the cohesive flow of the liquid metal layer and the interfacial sliding between the metal segments, enabling the circuit to achieve a stretchability of 80%-150% without the need for serpentine wiring, while maintaining high conductivity and high wiring density. This makes it suitable for flexible electronics and wearable sensing applications.

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