Xiaomi Mix 4: High-end import with a camera under the display

In most smartphones, the selfie camera can be easily seen behind a little notch or round hole in the top edge of the display. This is even particularly large in Apple smartphones, since other sensors such as those for face recognition also have to fit in there.

However, the notch isn't particularly favored by users, since it is not always implemented well and also takes away some of the precious real estate of the display.

A hidden 20-MP selfie camera

In order to make the selfie camera as invisible as possible, some smartphones such as the Xiaomi Mi 9T used a pop-up webcam, which is hidden in a small tray on the top edge and can be raised out of the case when needed. Another approach was taken by the ZTE Axon 20 5G which had an under-display camera. Here the webcam is placed underneath the display, so it takes pictures through it. However, this feature was relatively useless in the ZTE smartphone due to its bad image quality.

While the Xiaomi Mix 4 also uses an under-display camera, its image quality turns out far better than that of the ZTE Axon 20 5G. As our test shows, the 20-MP camera of the Mix 4, which is almost invisible in everyday operation, is already able to come fairly close to the image quality of ordinary selfie cameras. However, perhaps it might need a few more product generations until all the limitations of the quality can be removed.

The second particular feature of the Xiaomi Mix 4 is its 120-Watt charger. This allows charging the smartphone in record times - with the corresponding battery setting, it takes only 25 minutes until the empty battery is completely recharged to 100%. The Mix 4 can also be recharged wirelessly with up to 50 watts.

You can find out more on the complete test of the Xiaomi Mix 4 here.