Disables pulse width modulation to provide a different way to dim the OLED display, which can create a smoother display output at low brightness levels. Disabling PWM may affect low brightness display performance under certain conditions.
Affected users often complain of eye strain, headaches, and other symptoms, but it is a technology that display makers use because it is energy efficient. The iPhone 17 Pro and perhaps other iPhone 17 models could provide those who are bothered by PWM with a fix.