The third panel would be on the back of the device and would be used when the phone is folded down. To make it simple, the device would be like a tablet with two screens merging to form one when fully opened and one at the back to be used as you would in a traditional smartphone.
Samsung has always hinted towards foldable smartphones. In 2011, the company released a concept video of a transparent, foldable tablet.
Apart from that, a Samsung executive noted at the Mobile World Congress this year that the company aims to market the first high-end foldable smartphone.
They might not be alone in the quest for foldable smartphones.
In 2017, Apple received a patent for an electronic device with a “flexible display.” However, not many developments came out of that. Chinese company ZTE already launched a foldable smartphone last year, but the screens weren’t exactly merging owing to the large bezel between them.