Strain-localized luminescent e-skin for high-resolution pressure mapping and visual force feedback.

Area of Science:

• Materials Science
• Robotics
• Biomedical Engineering

Background:

• Existing electronic skins (e-skins) for tactile perception often rely on bulky, rigid designs or complex pixel arrays, limiting their application on soft, dynamic surfaces.
• Current visualized pressure mapping systems struggle with conformability to curved or soft substrates and can suffer from signal crosstalk.

Purpose of the Study:

• To develop a soft, high-resolution electronic skin capable of visualized pressure mapping on curved and compliant surfaces.
• To overcome the limitations of existing e-skins regarding bulkiness, complexity, and conformability.

Main Methods:

• Fabrication of an ultrathin, entirely soft microstructured electronic skin utilizing intrinsic force-electric-optical coupling.
• Harnessing strain-localized deformation within a continuous device stack for pressure sensing without discrete pixels.
• Achieving quantitative pressure sensing and high-fidelity mapping on curved and compliant substrates.

Main Results:

• Demonstrated high spatial resolution of 30 μm (847 dpi) and luminescent sensitivity of 1.12 cd·m⁻²·kPa⁻¹.
• Enabled real-time pressure distribution mapping and recognition of fine tactile features like fingerprints.
• Successfully integrated with plantar sensors for gait analysis and laparoscopic tools for surgical training, providing visual force feedback.

Conclusions:

• The developed soft mechano-electroluminescent e-skin provides a compact, high-resolution solution for visualized pressure mapping on challenging surfaces.
• This technology offers a versatile, multimodal platform for intelligent tactile interfaces in wearables, robotics, and biomedical applications.
• The approach eliminates the need for discrete sensing pixels, enabling seamless integration and enhanced performance.