A team at Queen's University Human Media Lab in Canada developed a new concept device called MagicScroll that features a rollable display wrapped around a cylinder that can be rolled to scroll the information. The display can also be rolled up to act like a regular tablet.
The display used in this demonstration is a 7.6" 2K rollable OLED. This is actually a tiled display made from two 5.5" FHD OLEDs taken from two LG Flex 2 smartphones (thank you Andrew M. Abrams from SCMR for clarifying this!).