Why the brightness change is not smooth when adjusting the brightness of the POCO X7 Pro manually or automatically?

Thank you for your support of Xiaomi products. All mobile phones undergo strict professional inspection before leaving the factory, so you can use them with confidence. The POCO X7 Pro has a professional eye-friendly display and triple TÜV Rheinland certifications.16,000 levels of brightness adjustment and 1920Hz PWM dimming together facilitate comfortable changes in brightness, reducing eye strain during extended use. In order to reduce flicker at low brightness, we use 1920Hz high-frequency PWM dimming. During the high and low brightness switching process, you will notice a slight brightness change, which is a normal phenomenon and part of the design to ensure smoother brightness adjustments.