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Apple adds user control over PWM dimming across the iPhone 17 family
At its recent launch event, Apple introduced the iPhone 17, iPhone 17 Pro, iPhone 17 Pro Max, and the new iPhone Air, each packing upgraded performance and camera improvements. One relatively low-key but important addition didn’t get much stage time: a system-level option to disable pulse width modulation (PWM) dimming on OLED displays. For users who experience flicker-related eye strain or headaches, this change could be a meaningful accessibility improvement.
What is PWM dimming and why it matters
PWM dimming reduces screen brightness by rapidly toggling the display on and off. At low frequencies this flicker can be perceptible to some people and may trigger headaches, eye fatigue, or discomfort — especially during long sessions at low brightness. Apple historically used low PWM frequencies on its OLED screens, which amplified complaints from sensitive users. The new iPhone 17 software gives users greater control over this behavior.
Product features: Display Pulse Smoothing
How the new setting works
Apple added an Accessibility toggle called "Display Pulse Smoothing." According to the feature description, it disables pulse width modulation and switches to an alternate dimming approach designed to produce smoother output at low brightness levels. Apple notes that turning off PWM may change how the display behaves in certain low-brightness scenarios, but for many users it will noticeably reduce flicker.
How to enable it
Go to Settings > Accessibility and look for the Display Pulse Smoothing option to disable PWM dimming. The control is simple and aimed at anyone who experiences flicker sensitivity or prefers a steadier screen output.
Comparisons: Apple vs. Android manufacturers
On Android, many vendors (except for a few like Samsung and Google who have their own approaches) have mitigated flicker by increasing PWM frequency to very high rates that are less likely to affect users. Those higher PWM frequencies can minimize perceived flicker while retaining the traditional dimming method. Apple's approach is different: instead of raising PWM to extremely high rates, iPhone 17 users can now eliminate PWM entirely via software.
Advantages, trade-offs and use cases
Advantages include reduced eye strain for sensitive individuals, improved comfort during night-time reading, and an accessible option for those with neurological or visual sensitivities. Potential trade-offs are slightly altered display behavior at very low brightness or specific rendering conditions — something Apple explicitly warns about. For users who value a flicker-free experience, this setting is a clear win.
Market relevance and the road ahead
This change signals Apple’s growing attention to accessibility and display health concerns, aligning the iPhone 17 lineup with user-driven customization trends. Ideally, device makers will combine high PWM frequencies with an option to disable PWM entirely so that users can choose the best solution for their needs. As OLED and next-gen display technologies evolve, expect continued refinements in dimming strategies across the industry.
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