Some prior leaks and rumors have pointed to the development of a phone with a display that extends on a roller at TCL. Now, the OEM has confirmed these hints with a new concept based on such a design. It is touted to solve some of the emerging issues with current flexible-display devices, creasing included.
https://www.notebookcheck.net/TCL-s-rollable-phone-now-exists-as-a-concept-device-as-does-its-tri-folding-tablet.455473.0.html