Check out my new infinity tattoo. It glows! (credit: The University of Tokyo, Someya Group Organic Transistor Lab)
We've gotten one step closer to a world where tattoos are made from LEDs and glowing watch faces embedded in your wrist can broadcast the time. It's the next phase in the development of e-skin, and circuits and sensors contained in flexible plastic sheets are thinner than human skin. Just stick the sheets on your body, stand in sunlight to power them up, and glow all night long.
A demonstration of the amazing electronic organic photonic skin. (video link)
E-skin, or flexible, stretchable circuits that can be stuck to skin, has been around for several years. But now a group of engineers have made a leap forward by integrating polymer LEDs into it. They explain their creation in Science Advances, showing how the new e-skin can display red, green, and blue light, which can be used for displaying biosigns like blood oxygen content and heart rate. Their e-skin also measures heart rate the same way many smart watches and fitness trackers do, by measuring the absorption of green and red light into the blood in a process called photoplethysmography.
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