https://www.cnet.com/news/tcl-dragonhinge-can-enable-a-family-of-foldable-devices-at-mwc-2019/

I got a close look at the new DragonHinge and foldable prototypes TCL has built. The hinge lets you do things like fold a display inward to close it like a book or curve it outward to wrap it around your wrist. 

The design concepts use custom flexible AMOLED displays from TCL's sister company, China Star Optoelectronics Technology (CSOT). Samsung, LG and CSOT are three of the biggest panel makers in the world, giving them all in-house expertise in flexible displays.