| May 02, 2023 |
A touch-responsive fabric armband - for flexible keyboards, wearable sketchpads
(Nanowerk News) It's time to roll up your sleeves for the next advance in wearable technology – a fabric armband that’s actually a touch pad.
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In ACS Nano ("Skin-Friendly and Wearable Iontronic Touch Panel for Virtual-Real Handwriting Interaction"), researchers say they have devised a way to make playing video games, sketching cartoons and signing documents easier. Their proof-of-concept silk armband turns a person’s forearm into a keyboard or sketchpad.
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The three-layer, touch-responsive material interprets what a user draws or types and converts it into images on a computer.
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| When a person draws a panda on this touch-responsive armband that’s worn on their forearm (bottom right of photo), it shows up on a computer. (Image: Adapted from ACS Nano 2023, DOI: 10.1021/acsnano.2c12612)
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Computer trackpads and electronic signature-capture devices seem to be everywhere, but they aren’t as widely used in wearables. Researchers have suggested making flexible touch-responsive panels from clear, electrically conductive hydrogels, but these substances are sticky, making them hard to write on and irritating to the skin.
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So, Xueji Zhang, Lijun Qu, Mingwei Tian and colleagues wanted to incorporate a similar hydrogel into a comfortable fabric sleeve for drawing or playing games on a computer.
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The researchers sandwiched a pressure-sensitive hydrogel between layers of knit silk. The top piece was coated in graphene nanosheets to make the fabric electrically conductive.
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Attaching the sensing panel to electrodes and a data collection system produced a pressure-responsive pad with real-time, rapid sensing when a finger slid over it, writing numbers and letters.
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The device was then incorporated into an arm-length silk sleeve with a touch-responsive area on the forearm. In experiments, a user controlled the direction of blocks in a computer game and sketched colorful cartoons in a computer drawing program from the armband.
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The researchers say that their proof-of-concept wearable touch panel could inspire the next generation of flexible keyboards and wearable sketchpads.
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