The OPPO X 2021 is a rollable concept phone featuring a scroll-like display. Built with an OLED flexible screen that measures as small as 6.7 inches and as large as 7.4 inches, thanks to a dynamic sliding frame, it extends and retracts smoothly with no hard folding involved. With a continuously variable OLED display that is infinitely adjustable between a minimum of 6.7 inches and a maximum of 7.4 inches, you are free to define your own boundaries.br With the power of infinite in your hands, you have instant access to a phone or a tablet device without the screen creases often associated with traditional folding screens.