Apple’s Vision Pro displays run at 90Hz with HDR support / Technical details on Apple’s mixed reality headset are coming out of WWDC developer sessions, including a bump to 96Hz for 24fps 2D
Apple's next Pro models could up the refresh rate (Image credit: Future). By far the screen rumor we’ve heard most about the iPhone 13 is that it (or at least some models in the range) might

New Apple iPad Pro 10.5 and 12.9 debut; iOS 11 announced: smarter Siri, smaller videos, better UI, louder music; Apple's HomePod smart speaker is official with big focus on audio quality

Display Super Retina XDR display 5.8‑inch (diagonal) all‑screen OLED Multi‑Touch display HDR display 2436‑by-1125‑pixel resolution at 458 ppi 2,000,000:1 contrast ratio (typical) True Tone display Wide color display (P3) Haptic Touch 800 nits max brightness (typical): 1200 nits max brightness (HDR) Fingerprint-resistant oleophobic coating
Adaptive refresh rate on the S21 Ultra alleviates that. It goes all the way down to 10Hz when necessary. But from what you're saying it sounds like it's actually Pokemon Go that's draining your battery and not actually the high refresh rate.
The driver of a display rapidly scans down the screen, usually from top to bottom, updating the state of each pixel. It just happens too fast for our eyes and brains to notice, until it causes a
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iphone 11 pro screen refresh rate