Why does the brightness fluctuate and have slight flickering when adjusting it manually or automatically on the Redmi Note Pro 13?

Thank you for your support of Xiaomi products. The phone undergoes strict professional investments before leaving the factory, so you can use it with confidence. If you enable Automatic brightness, the brightness will adjust automatically according to the ambient light. You can also adjust the brightness based on your requirements or preferences.
To reduce flickering at low brightness, we use a high-frequency PWM (Pulse Width Modulation) of 1920Hz for brightness adjustment. During the transition between high and low brightness, you will perceive slight brightness changes, and this is considered a normal phenomenon.