As you can see in the diagram above, the patent describes a phone with a foldable display that opens and closes like a book. While such foldable devices aren’t exactly new, what makes Microsoft’s attempt different is that in their iteration, it describes how the hinge will lie flat as opposed to protruding like a bump.
According to Microsoft’s description, “With a dual-display device, the mobile phone or tablet can include an open, expanded position where both displays are flush so that the user feels like there is a single integrated display. In a closed, condensed position, both displays are face-to-face so as to protect the displays. In a fully-open position, the dual displays can sit back-to-back so the user needs to flip the device to view the opposing display,”
Note that this is not the first time we’ve seen such a patent. Earlier this year another patent by Microsoft was discovered, plus towards the end of 2016, a report claimed that Microsoft had teamed up with LG, Apple, and Google for foldable displays. Whether or not this results in a phone that resembles the diagram above remains to be seen, but if anything it does show that Microsoft is interested in the idea.