Semiconductor Energy Laboratory, in collaboration with Nokia developed a new foldable OLED display. The companies are demonstrating two display prototypes. Both displays are 5.9" in size with a 1280x720 (249 PPI) resolution. One of them can be folded in two (like a book) and the other can be folded in three (seen in the video below).
Those flexible OLED displays use a white OLEDs with color filters (WOLED-CF) design. To produce the display, SEL deposited the organic and color filters layers on a glass substrate, which is later peeled off and replaced with a flexible substrate. The displays can be bent up up to a curvature of 2 mm (two-folds) or 4 mm (three folds). SEL says that these displays can be bent more than 100,000 times.
I assume these new displays use SEL's CAAS-OS (C-Axis Aligned Crystalline Oxide Semiconductor) backplane.