On March 27, Xiaomi Mi 9 received the latest update in China known as ‘MIUI 10 9.3.27’ for the beta users. The greatest change in the new update is the full support of DC dimming.
The system update log shows that Xiaomi Mi 9 has added a low-brightness DC dimming function, thus achieving full DC dimming.
The data shows that DC dimming changes the screen brightness. It does so by increasing or decreasing the circuit power, power = voltage x current, thus, changing the voltage or current supplied to the screen brightness.
PWM dimming changes the brightness of the screen by turning the light on and off. Because the light and the dimness are fast enough, it is beyond the human eye. The longer the screen-off state lasts, the lower the screen brightness. On the contrary, the longer the screen-on time, the brighter the screen, which is what we call strobe.
It is worth noting that different people have different sensitivity to the alternate lighting of the screen. Some people are more sensitive. These people, when encountering low-frequency PMW dimming screen, eye discomfort may occur, commonly known as “Eye Strain”.
At present, the Black Shark Helo, Black Shark 2 gaming smartphones has achieved full DC dimming, and smartphone brands such as Xiaomi, Meizu, iQOO, and OPPO are also following up the optimization.
The question is: Will Xiaomi bring the MIUI 10 9.3.27 DC Dimming Update to other models as well or not? We will find out soon.
Source (in Chinese)