madmozg Yea based on notebookcheck results, Nokia X30 and Iphone 14 Plus seem to have similar waveform.
Below is a video of iPhone 14 plus recorded in 1/8000 shutter speed.
(timestamp: 01:12)
https://www.bilibili.com/video/BV1C8411x7LX/?spm_id_from=333.999.0.0
Warning: Do not click play on the video if you are very susceptive to flickering. Clicking on the timestamp will do.
Black bands indicate PWM. The thicker the band, the longer is the screen off time during PWM off intervals. Hence more noticable.
Based on the above video, iPhone 14 Plus PWM is somewhat better than other OLED as long as brightness level is above 25%. It looks to be using DC dimming above this brightness. Below 20% however, it is flickering vigorously.
I have to argued though that notebookcheck's claim of that Nokia x30's amplitude curve of the frequency curve is flat is rather flawed. Through their given measurement at 10ms interval, even a PWM of 100 hz can easily pass off as having a "flat" amplitude curve.
Additionally, their claim of "always flat" is not really always. Their result seem to have contradicted their claim. If you look at the waveform at 50% and 75%, it does look flater, resembling their results from iPhone 14 Plus. However, at 25% of Nokia X30, it looks very different. Thus I suspect there is no "flatter" amplitude curve below 50%.