Who needs foldable smartphones now OPPO has a prototype rollable?

摘要

The inward-folding smartphones such as the Galaxy Z Flip and Galaxy Fold series are adopting a book-like foldable concept, with the inevitable crease as a result. However, the rolling design of the new OPPO X 2021 might reduce, or even avoid, the crease thanks to a rolling mechanism, which resembles the out-folding devices.