Xiaomi explains more about how its under-screen camera works
The fight over notches is quickly becoming a thing of the past, with companies like Oppo and Xiaomi already working on transparent display cameras that hide the sensor beneath the screen — no notch required. Xiaomi says the setup allows the area of the display to become transparent to take pictures, and the transparent display then cleverly doubles as the camera lens on top. It doesn’t appear to be a perfect system yet: in Xiaomi’s slides, you can still see a faint outline of the camera lens underneath the active display, but it’s at least a useable area of the screen instead of one that’s obscured entirely by a monolithic notch on top.
Source: www.theverge.com