Sharp has thrown its hat into the foldable-device ring by displaying its own device built around a flexible OLED panel. This screen will apparently measure 6.18-inches and have a 1440 x 3040 resolution when part of a finished product. Interestingly, it takes a clamshell form-factor and folding action, which is also associated with no companies besides Motorola at this point.
https://www.notebookcheck.net/Sharp-teases-its-own-foldable-phone-prototype.416219.0.html