battery and everything else wrapped up in a case made entirely from PCB — inspired by [Voja Antonic]’s FR4 enclosure technique, and the LED array is embedded in clear resin. Along the way ...

As the name implies, the goal with this project is to do away with all that and replace it with a self-actuating flexible PCB. The device ... an earlier single-LED version into the 2019 Hackaday ...