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PWM flicker on phones: why it strains your eyes, and the fix

What PWM flicker on OLED screens is, which phones reduce it (Pixel, iPhone, Galaxy, vivo) and how to tell if it bothers you before you buy a new phone.

By Founder and editor of GamaMóvil

If your head aches or your eyes sting after some time on your phone, especially at night with the brightness turned down, it may not be plain tiredness. Almost every OLED screen flickers to control brightness, and some people are sensitive to it. It isn’t a rare defect; it’s how the display works. What helps is knowing how much yours flickers and which settings or models reduce it.

The short answer

  • PWM (pulse-width modulation) means switching the screen on and off hundreds of times a second to fake lower brightness. The lower the brightness, the longer it spends “off”.
  • What matters: the frequency (higher is better) and the brightness you use. At high brightness there’s almost no flicker.
  • It doesn’t affect everyone. If you’ve never had discomfort, that’s no reason to replace your phone.
  • If it bothers you: try the system settings below first, and only look for a high-PWM or flicker-free model if that isn’t enough.

What the labs measure

The figure that almost never appears on the spec sheet comes from independent testing. According to Notebookcheck’s measurements:

  • Pixel 10 Pro: PWM at ~240 Hz out of the box. An accessibility setting, “Adjust brightness for sensitive eyes”, raises it to ~480 Hz. Per Android Authority, the base Pixel 10 stays at 240 Hz.
  • Galaxy S26 Ultra: ~240 Hz worst case, with a ~480 Hz component.
  • iPhone 17 Pro: ~240 Hz. Notebookcheck’s review of the iPhone 18 Pro measures ~60 Hz, lower than the previous model, though the same review cites an effective ~480 Hz once dimming is factored in; the two numbers aren’t directly comparable.
  • Other brands: Notebookcheck cites ~2,160 Hz for Oppo and ~4,000 Hz for Xiaomi and Honor; the vivo X300 Ultra is advertised at 2,160 Hz.

Price of the phones mentioned (USD)

Galaxy S26 Ultra$1,399.99vivo X300 Ultra~$1,649iPhone 18 Pro$1,199Pixel 10 Pro$999Pixel 10desde $799
Original chart built from the data in our tier comparison.

The chart makes one thing clear: PWM frequency doesn’t rise with price. The ~240 Hz phones cost between $799 and $1,399, and the one advertising the highest rate is an import that runs around $1,649. Paying more doesn’t guarantee less flicker.

What counts as “high” or “low”

There’s no official standard for phones. The usual reference comes from LED lighting: IEEE 1789-2015 treats full on/off flicker as acceptable from ~1,250 Hz upward, and below that it limits how much the light may swing. It was written for lighting, not screens, and some people dispute the threshold. Use it as orientation, not a verdict.

Two caveats that change what you buy:

  • Frequency alone isn’t the whole story. Flicker depth matters too. The ~240 Hz on the iPhone, Pixel and Galaxy comes with an amplitude of ~14-17% according to Notebookcheck: shallow flicker, but present.
  • It’s subjective. Some people notice 240 Hz; others can’t tell at 60 Hz.

What you can do today for free

  1. Raise the brightness and soften the room light. Flicker grows as brightness drops. At night, a dim ambient light helps more than minimum brightness.
  2. iPhone 17: iOS 26 added an option to turn off PWM on all iPhone 17 models (17, 17 Pro and 17 Pro Max), under Accessibility > Display & Text Size. Apple warns it may affect low-brightness display performance in certain conditions. The exact label may vary by version, so confirm it on your device.
  3. Pixel 10 Pro: turn on the sensitive-eyes setting (480 Hz). It isn’t a complete fix for the most sensitive users, per Notebookcheck.
  4. Test before you decide. Photograph the screen with another phone’s camera in dim light: dark bands suggest flicker. It’s a rough home test, not a measurement.

Update or replace your phone?

  • Nothing bothers you: ignore it. Replacing a phone over this number would be money spent for no reason.
  • It bothers you and you have an iPhone 17: try the PWM-off option first.
  • It bothers you and your phone has no setting: look up the PWM figure for the exact model in independent reviews before buying; manufacturer spec sheets rarely list it. Models with thousands of Hz (vivo, Honor, Oppo, Xiaomi) tend to fare better in tests, and Motorola reportedly uses flicker-free dimming on some foldables. For display-focused rankings, see our Top 10 Android phones, the Top 10 iPhone or the comparison page.
  • You want less eye fatigue in general: dark mode, a break every ~20 minutes and soft background light matter as much as the model.
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FAQ

Does PWM damage your eyes? There’s no solid evidence of permanent damage in normal use. What is reported is discomfort (fatigue, headaches) in sensitive people.

Does a 120 Hz phone flicker less? It’s not the same thing. 120 Hz is the image refresh rate; PWM is brightness flicker. A phone can have 120 Hz refresh and 240 Hz PWM.

Do LCD screens use PWM? Many LCDs dim the backlight, and some use PWM too, but it’s less common on today’s high-end phones.

Do blue-light screen protectors help? They don’t touch PWM. They may cut glare, but not flicker.

Sources

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