Sharp showed a prototype smartphone with a folding screen. On the video you can see that the screen folds like a sheet of paper, except that there is no arrow on it.
Such a screen is said to withstand 300thousand bends. Seems not bad. However, what you see on the video will not be put into the series - Sharp is only showing the technology, there are no plans to implement it in market models. Maybe someone else will take advantage of development.