Flexible, surface-lighting MicroLED skin patch for multiple human skincare

Abstract

As the global population ages, concerns regarding aesthetic appearance have increased. Wearable light-emitting diode (LED) devices have received significant attention in the cosmetic fields due to their non-invasive, nonthermal, home-use characteristics. However, conventional bulk LED chips have limitations in flexibility and uniform irradiation, hindering efficient light penetration into the skin. Here, we introduce a flexible, surfacelighting microLED (FSLED) patch with uniform light-emission for various skincare applications. The FSLED was fabricated using a pick-and-place transfer technique, which allows for high-density irradiation over the large area, while maintaining outstanding mechanical flexibility. In addition, the FSLED was designed to deliver light efficiently and emit light evenly by conforming to the skin. Finally, we prove the effect of the FSLED for pore tightening and skin rejuvenation through clinical trials.