Smartphones with curved displays reaching over all four edges of the device will be the prevailing trend in 2020 according to a well-known tipster. While the "waterfall" design has the screen tumbling over the right and left edges of a smartphone, the "quad-curve" design will utilize the top and bottom edges, too. Some have questioned the utility of such a curved smartphone display, though.
https://www.notebookcheck.net/Quad-curve-flagship-smartphones-will-rule-the-roost-in-2020.444800.0.html