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The iPhone 17 Pro Max uses 480Hz PWM for brightness control. For most people, irrelevant. For some, it causes real problems.
What's happening:
PWM controls brightness by rapidly turning pixels on and off. At lower brightness, more time in "off" state. Your eyes might not consciously see flicker, but some bodies react anyway.
The symptoms:
Eye strain. Headaches. Fatigue after extended use. Usually worse at low brightness, like in bed at night.
Am I affected?
If you've had issues with other OLED phones or certain monitors, you might be sensitive. If you've never noticed screen problems, probably fine.
How iPhone compares:
Samsung S25 Ultra: same 480Hz. Honor Magic 7 Pro: 3840Hz. Higher frequency = fewer issues for sensitive people.
What to try:
Keep brightness higher. PWM less noticeable at higher levels. Enable True Tone. Use "Reduce White Point" in accessibility. Take breaks with the 20-20-20 rule.
Before buying:
If you suspect PWM sensitivity, test the phone in an Apple Store at low brightness for 15-20 minutes.
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