Not heard of it but the article above notes this reference from 2013:
https://onlinelibrary.wiley.com/doi/full/10.1002/lsm.22173
yes, I saw this a couple of days ago, and I'm already asking myself what they are waiting for... you don't need any clinical trials to release some µLED patches
this Korean thing is some new micro-LED technology, it's claimed to be as effective as a Low-Level-Laser therapy but much more efficient, less energy consuming and more convenient