Samsung has captivated some tech enthusiasts with its Galaxy Z Flip neo-clamshell phone, the second of its kind to be foldable. Now, a different mobile device company, OPPO, has designed one much like it, but in reverse. Its screen is on the outside, with a sensor that detects the angle at which it is unfolded.
https://www.notebookcheck.net/OPPO-patents-a-clamshell-foldable-phone-with-the-screen-on-the-outside.490927.0.html
There's not enough battery for this kind of design, from the render it doesn't seem to be able to fit north of 2800mAh. It's just a figure, granted, which is why making a render accurate to the figure would be meaningless.
Think Z Flip, which looks twice as thick as this, and then a "chin" twice as thick as one of the sides...that thickness would comfortably fit a 1" sensor with a f/1.4 prime though, a retractable zoom may even be possible.