Tianma demonstrated its flexible and foldable AMOLED displays at MWC 2018 earlier a couple of weeks ago, and the following video shows a nice tour of the displays at Tianma's booth.
The first display you see is a 5.5" FHD flexible AMOLED (on a Polyimide substrate). There's a long discussion there about creating a foldable Phone around that, but beyond that it is nice to see Tianma's flexible OLEDs in action.
The second display (at 6:15 or so) is Tianma's foldable display demo. Tianma's representative thinks that phones that use its foldable displays will not enter the market for at least 3 years.
The rest of the displays in this video are LCDs.