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Stretchable OLED Heart Monitor Band-Aid
A stretchable OLED display from Samsung has been used in a prototype heart monitor Band-Aid.
(SAIT Proto System)
Through this study, stable performance in a stretchable device with high elongation was achieved. This research was also the first in the industry to prove the commercialization potential of stretchable devices, given that the technology is capable of being integrated with existing semiconductor processes.The SAIT [Samsung Advanced Institute of Technology] research team was able to integrate a stretchable organic LED (OLED) display and a photoplethysmography (PPG) sensor in a single device to measure and display the user’s heart rate in real-time, thus creating the ‘stretchable electronic skin’ form factor.
To put their research to the test, the SAIT researchers attached stretchable PPG heart rate sensors and OLED display systems to the inner wrist near the radial artery.3 Doing this allowed them to confirm that wrist movement did not cause any property deterioration, with the solution remaining reliable with skin elongation of up to 30%. This test also confirmed that the sensor and OLED display continued to work stably even after being stretched 1,000 times. What’s more, when measuring signals from a moving wrist, the sensor was found to pick up a heartbeat signal that was 2.4 times stronger than would be picked up by a fixed silicon sensor.
Science fiction fans may recall the stretchable flexies from Pushing Ice (2005) by Alastair Reynolds:
As the car slid along Rockhopper's spine, Bella unzipped her jacket and removed the flexy that had been recharging itself from her body heat. A deft flick of her wrist stiffened the sheet of leathery plastic.
(Read more about flexies)
Another science fictional idea that would ideally use a flexible display is the handwriter from Steel Beach by John Varley.
Other work has been done on this technology; see OLEDs Connected In Stretchable Display and Stretchable Silicon Electronics For Sports Apparel.
Scroll down for more stories in the same category. (Story submitted 6/3/2021)
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