Huawei’s CMO, Herman Zhu confirmed at MWC 2019 that there was a secret camera underneath the foldable Mate X’s current array. The Mate X changed the side of the phone that had a screen turned on, flipping automatically when taking a picture. Zhu said that this was Huawei’s technology, and there was a hidden fourth camera that nobody knows about. He said he wouldn’t elaborate beyond that, apart from gesturing below the current three-camera array on the rear.
We’d guess if we were to speculate that there’s an additional sensor below there. It is capable of working out what’s in front of it and a closer look at the images. He added, we have used some contrast enhancements and it seems to indicate another sensor there. You will find out more in the future about whether the Mate X is hiding some extra technology, which wouldn’t be surprising given how far off the availability of the foldable phone is, but we’ll wait and see precisely what it features when we get more time with a final version.
There was one other surprise from Zhu about Huawei’s ambition to add another screen to the Mate X. it isn’t an actual physical screen like the LG DualScreen accessory, but a tweak to the Mate X’s user interface that would see the ‘spine’ of the device, when folded with displaying other information. It would be similar to the Samsung Galaxy Note Edge, which used the curved side to pack icons and novel things like rulers or a news ticker. But, you will have to wait and see if it actually appears, and how Huawei might make it work.