A sweater with a touchscreen built into its sleeve is no longer just a lab idea. Researchers at the National University of Singapore have developed a fibre that works as a light-emitting pixel and a pressure sensor at the same time, and used it to build a sleeve that can display images and video, respond to touch and connect wirelessly to other devices.
The work, led by engineer Fu Heng and published in the journal Nature, takes a different route from flexible displays stuck onto clothing: here the screen is born inside the thread. The team integrated 54 of these fibres into the sleeve, which remains flexible, breathable and washable like ordinary clothing. According to the researchers, the fabric survives 50 gentle machine washes and 1,000 bending cycles.
The production process starts from thin copper wires. Lasers strip the insulation at precise points, and light-emitting chips are attached to the exposed sections. The fibres are then placed in a transparent plastic tube and made pressure-sensitive with two strips of a compressible, conductive polymer. The method, the authors say, can make fibres up to 10 metres long, thin enough to be woven into or attached to fabrics. The prototype also includes a microphone, a speaker, a temperature sensor and a light sensor.
The demonstration shows simple interaction, comparable to early smartphones and tablets, and the prototype is still far from everyday use. The chips connect through cables to a separate control circuit, and power comes from an external battery pack. Shanshan Yao, an assistant professor at Stony Brook University who commented on the study, notes that the next steps are integrating the control electronics more seamlessly and developing threads that harvest energy from body heat or movement. If the fibres prove compatible with industrial weaving, knitting and embroidery, electronic textiles could take almost any shape or size.
The research fits a broader effort to move computing from rigid devices onto the body, as shown by the MIT's soft skin designed for VR and physiotherapy or the 3D-printable fabric that generates energy from movement.
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