This Wearable Digital Display Just Sticks On Your Skin

Photo: Someya Group Organic Transistor Lab/The University of Tokyo

It’s clear that smart watches and fitness bands will eventually give way to a far more comfortable, subtle wearable—a temporary tattoo that you barely notice is there because it stretches and bends with your skin. The first generation of such stickers are coming out this year from L’Oreal and others.

Much work has been done on making flexible sensors that can fit unobtrusively in such devices. Last year I tried...

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