Phones such as the Asus Zenfone 7 Pro have previously explored the idea of using powerful rear-facing cameras that can be flipped around for taking selfies. While that implementation with its motorized hinge causes the phone to transform physically on the outside, Xiaomi's idea involves all the action taking place internally.
https://www.techspot.com/news/89607-xiaomi-patent-reveals-under-display-rotating-camera-selfies.html?utm_source=dlvr.it&utm_medium=blogger
https://www.techspot.com/news/89607-xiaomi-patent-reveals-under-display-rotating-camera-selfies.html?utm_source=dlvr.it&utm_medium=blogger