The first image shows a foldable smartphone like the Galaxy Fold, only it folds in two rather than one place. Accordingly, there are not two parts of the screen, but three..
With this form factor, there is no need for an additional external display – one of the parts can be used instead. In addition, the area of the large screen increases, and when unfolded it turns out to be a real tablet..
The second image shows a smartphone with a rolling display. Moreover, it is difficult to call it even a smartphone, since in its expanded form it becomes a full-fledged tablet.
Samsung, Smartphone, Display device
EbeneMagazine – US – Published sketches of two Samsung smartphones with flexible display