The iPhone 12 display flickers at 226 Hertz
Like many OLED displays, the iPhone 12’s panel flickers at a high frequency, but still perceptible by some owners. That posed Notebookcheck now stuck in a test of the new smartphone from Cupertino. The testers determined a number of vibrations of a good 226 Hertz. According to her, the reason for this is probably the pulse width modulation (PWM), which Apple uses for brightness control. This procedure turns the display off and on in quick succession; This is necessary because, unlike LCDs, OLED panels do not have a backlight that can be regulated a little differently.
Symptoms of fatigue and burning eyes are possible
Although a frequency of 226 Hertz is actually beyond the perception of the human eye, the flickering of the iPhone 12 (and other devices) can cause problems for sensitive people. According to the testers, it can cause symptoms of fatigue, burning eyes and headaches, for example. Extremely sensitive users even notice a visible flicker. In principle, however, it only occurs when the smartphone is not operated at full brightness. In addition, very few people notice the flicker.
iPhone flickers at a comparatively low frequency
Compared to previous iPhone generations and devices from other manufacturers, the iPhone 12 flickers at a low frequency. According to Notebookcheck, the pulse width modulation in the iPhone 11 Pro works with 290 Hertz, in the iPhone X, XS and XS Max with 240 Hertz. The Google Pixel comes to almost 370 Hertz, the OnePlus 8T even to 458 Hertz. According to the testers, PWM is used in around half of all smartphones. The process is used in a similar form in a number of devices with an LC display, but there it is – if at all – only perceived as annoying at very low brightness levels.