Development of display technology that stretches like a rubber band

A stretchable health monitoring system developed by Samsung Electronics Advanced Institute of Technology. Provided by Samsung Electronics

Samsung Electronics has succeeded in developing a ‘stretchable display’ technology that can be freely deformed like a rubber band while maintaining the device’s performance.

On the 6th, Samsung Electronics Advanced Institute of Technology published the results of ‘Stretchable Sensor and OLED (Organic Light Emitting Diode) Display Development Research’, which is attached to human skin and increases and decreases according to body movement, but does not deteriorate in performance, in the world-renowned scientific journal Science Advances. (Science Advances). This study is characterized by realizing the performance stability of the device according to elongation (increasing length).

The research team formed a ‘stretchable electronic skin’ form factor by integrating a stretchable OLED display and a photoplethysmography (PPG) sensor into one device.

Optical blood flow measurement is a method of measuring pulse waves by projecting light such as LEDs onto blood vessels and changing the reflectance of light according to the expansion and contraction of blood vessels when blood passes through them. Through this, the research team proved the possibility of expanding the applications of stretchable devices in the future.

The biggest achievement is that the composition and structure of ‘elastomer’, a high molecular compound with excellent elasticity and resilience, was changed and applied to the substrate of stretchable OLED display and optical blood flow sensor through the existing semiconductor process for the first time in the industry. In addition, it was confirmed that even if the display and sensor were increased by 30%, the performance was not degraded.

The researchers attached an electronic skin that integrates a stretchable optical blood flow measurement heart rate sensor and an OLED display on the inside of the wrist where the radial artery (the artery that runs through the outside of the forearm, usually the pulse) is located.

In the electronic skin, there was no deterioration in properties up to 30%, which is the maximum degree of skin deformation according to wrist movement. Even when the length was increased by repeating 1000 times, the OLED display and the optical blood flow sensor operated stably.

Specialist Researcher Young-Jun Yoon said, “The advantage of being able to measure biometric information for a long time without restrictions in daily life, such as sleep and exercise because it has an excellent sense of unity with the real skin,” said, “It has great potential for application as a wearable healthcare product.”

Reporter Hyejeong Nam [email protected]

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