Motorola showed the concept of a smartphone with a retractable display.

At the Lenovo Tech World event, Motorola showed off an interesting but not new concept. This is a smartphone with a screen that can be unfolded and collapsed - all you need to do is press a button. The smartphone has a retractable OLED display that can grow from 4" to 6.5" in height. So far, there are no details about the characteristics.