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Correcting Flicker on OLEDs During Low Brightness Images
April 08, 2019 OLED panels sometimes flicker when used in the lower brightness ranges. This is because these OLED panels utilize Pulse Width Modulation to control brightness. PWM cycles emitter on and off in rapid succession to control brightness, and the variation in this cycling is how brightness is controlled as shown below and how it relates to screen flickering at lower brightness levels: Figure 1: Pulse Width Modulation Source: xdadevelopers
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At low brightness levels, the OLED panel will periodically emit a pulse of bright light. The low brightness levels are used in low ambient luminance, so these pulses of bright light become more noticeable as “screen flickering” in such conditions. Not all users can notice them, but they may cause eye strain irrespective of whether you can notice them or not. OEMs have become conscious of the effects of PWM and have begun taking steps to provide alternate solutions like DC dimming, which is a more conventional method of dimming the OLED panel by adjusting the DC current, but at the cost of perceivable quality. Xiaomi introduced DC dimming with its Black Shark 2, and also begun rolling out the feature to the Mi 9 in one of the newer MIUI betas. Several other OEMs like Meizu, OPPO and Vivo’s iQOO have also promised devices with this feature. Now, OnePlus CEO Pete Lau has mentioned on Weibo that OnePlus is also exploring DC dimming functionality. The demo within their development team has gone well, but there are limitations to DC dimming. As a result, the Chinese OEM is looking to provide this as an optional feature within OnePlus Laboratory or within the Developer Options, in a future update. From: XDA- Developers
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Barry Young
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