Looks like this idea a little too fantastic even for a new concept. The authors offer a simple reminder about charging the phone - switch the "ordinary» AMOLED-display in monochrome mode screen technology with E-Ink. This is a monochrome mode is used for power saving mode of the phone.
We can only guess when it's the interesting times in which the electronic filling system, including the battery, can be done either transparent or so small that they can hide the navigation button to the device.
But it looks like the device in the picture is certainly so beautiful.