The US Patent and Trademarks Office (USPTO) has approved Samsung's patent for what is depicted as a "display device" that folds in half. It appears to be at least tablet-sized, and may thus be for the long-rumored Galaxy Tab Fold, or a very similar device. The document shows how Samsung intends to make a flexible display work on a larger scale.
https://www.notebookcheck.net/Samsung-s-latest-patent-may-put-its-first-gen-foldable-tablet-closer-than-ever-to-launch.531915.0.html