Phone cases are generally used to add a layer of protection to your device and protect against small scratches and marks. Rarely has a company produced a phone case that's ever added more functionality than just protection - until now.

Oaxis has designed an iPhone case that features a full display of its own on the back. The InkCase i7 features an E Ink screen which allows users to display photos, to-do lists, read eBooks, news articles and also assists them in taking selfies.

It comes with an inbuilt battery, storage space, Bluetooth connectivity and is designed to be drop-proof and waterproof. What is more impressive is that with all this function, it still manages to only be 4.5mm thin. 

Find out more about the InkCase i7 here.