Thank you for your support of Xiaomi products. The phone undergoes rigorous professional testing before leaving the factory, so you can use it with confidence. OLED displays utilize pixel self-emission technology, and you will notice slight variations in color and hue, which are characteristic of OLED displays and considered normal. To meet your demands for DC (Direct Current) dimming, we have developed hardware-level DC dimming algorithms. Enabling DC dimming can result in color gradient loss at low brightness levels. If this affects your usage experience, you can try improving the screen appearance.
You can refer to the following steps to do so:
Go to [Settings] >> [Display & brightness] >> [Anti-flicker mode] >> [Regular] or manually increase the screen brightness.