The OnePlus 7 Pro is an impressive piece of device and it’s quite fast compared to other flagships in the market. After the recent software update, its camera quality matches any flagship device. The battery life is solid as well. But users are finding a new problem with the device. Many people watch YouTube videos for 30 minutes on bed to lull themselves to sleep. However, users of OnePlus 7 Pro found that their eyes get very tired when doing this.
High-end smartphones, including the OnePlus 7 Pro, are using OLED or AMOLED display. This technology doesn’t use backlight, because each pixel lights up. However, LED lights don’t use dimmer switch and they are binary, so either we turn them on or off. To produce lower brightness, LED lights will simply flicker at different frequencies. As an example, OLED displays can have 50 percent brightness by being turned off 50 percent of the time. This process is called PWM or pulse-width modulation and it happens very rapidly. Compared to LCD displays, OLED flickers less often and it’s detectable by our eyes, although we are not consciously aware of it.
AMOLED display flickers 240 times per second or 240 Hertz. This is enough for our pupil to shrink and expand at the same rate, due to the split-second changes of brightness. Most people are not aware of the flicker, but they will feel that their eyes are tired for no apparent reason.
Thankfully, OnePlus is aware of this problem and it already implements a feature to address the pulse-width modulation. At very low brightness, the OLED display of OnePlus 7 Pro won’t flicker as much. However, slight color aberrations may be visible when users enable this feature. Even so, it’s a minor trade off, because your eyes are no longer hurting.
It’s easy to enable this feature. Go to Settings and look for OnePlus Laboratory, then enable the ‘DC Dimming’ option. It should be more comfortable to use the device at low light condition.