The OnePlus 7 May Feature DC Dimming. But What Exactly Is It?
By Karan Kumar • 09/04/2019 at 3:14AM
OLED displays causes eye strain and headaches which affect a lot of people, and this switchable feature might be a solution for it.
Chinese smartphone manufacturer OnePlus is adding a new feature that will make smartphone usage more comfortable for many people. Smartphone displays (OLED and LCDS) work using a feature called PWM (Pulse Width Modulation) to control the brightness of a display. In this method the smartphone display is made to flicker at a very high frequency (above 200 Hz) not perceptible to the human eyes. This flicker causes health problems like eye strain and headaches for many people. The video shows the display flickering on an iPhoneX.
As the name suggests, Phase Width Modulation is about modulating the width of the phase of a signal.
A new method that improves this condition in displays is called DC dimming. In this method (Power=Volatge X Current), once you increase/decrease the voltage, the power has a similar effect on it. Since, we have decreased the brightness without making the flicker more evident, decreasing the voltage is the another option. This process where the brightness is controlled using the voltage is called DC Dimming. OnePlus CEO Liu Zuohu, promoted the feature on the micro-blogging website Weibo.
But, the downside to one of this feature is the decrease in quality of color produced. The quality of the color produced can be reduced significantly. There is an alternative to this as well, as OnePlus's next device, the OnePlus 7, might come with an option to turn off or turn on the feature in a device.
This is not new technology though, and it’s already present in a few smartphones including the Xiaomi Black Shark 2 and the Xiaomi Mi 9. It is also expected to appear in Oppo's latest Reno model, which is expected to be launched later this month.
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