As of my knowledge cutoff in September 2021, iPhones do not offer a direct user-accessible option to disable pulse-width modulation (PWM) on their displays. PWM is a technique used to control brightness by rapidly turning the display on and off, which can cause eye strain or headaches for some individuals.
While it may not be possible to disable PWM system-wide on iPhones, there are a few suggestions you can try to mitigate the effects:
- Enable "Reduce White Point": Go to Settings > Accessibility > Display & Text Size > Reduce White Point. Enabling this option can help reduce the intensity of bright elements on the screen.
- Adjust Brightness: Lowering the screen brightness might help alleviate the discomfort caused by PWM. You can adjust the brightness by swiping down from the top right corner (or from the bottom on older iPhone models) to access the Control Center.
- Use Night Shift: Night Shift is a feature that adjusts the color temperature of the display towards warmer tones, reducing the amount of blue light emitted. Blue light can contribute to eye strain. You can enable Night Shift in Settings > Display & Brightness > Night Shift.
- Consider Using Accessibility Settings: In the Accessibility settings, you can explore options such as "Increase Contrast" or "Invert Colors" to personalize the display appearance and potentially reduce eye strain.
Please note that the availability and functionality of these features may vary depending on your iPhone model and the version of iOS you are using. It's always a good idea to keep your device up to date with the latest software updates as they may introduce new display-related features or improvements.