DC dimming essentially lowers the actual amount of power going to the display at lower brightness levels. This should give an improvement in battery life. It has no effect at high brightness levels.

Is DC dimming good or bad?

This is because DC dimming has a big drawback. At low levels of brightness, the colors often come out skewed on OLED panels. In OLED panels, a change in voltage could change the emitted colors. So, at lower levels of voltage, the perceived quality of the smartphone display could go down significantly.

What is the use of DC dimming?

DC Dimming, on the other hand, is simple in theory and the most obvious way of reducing brightness. It involves reducing current or voltage through the backlight to lower the brightness. DC Dimming, however, isn't easy to implement for OLED screens, the kind OnePlus uses on its phones.