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Context

• The recent iPhone 13 Pro range is offering a 120Hz high-refresh-rate display which Apple is calling ProMotion.

Refresh Rate

• Whether it is a TV, a PC monitor, or a smartphone, all devices constantly change the pixels they display to project the appearance of motion.
• Simply put, refresh rate means how many times the image on a screen can be updated or “refreshed” every second – much faster than your eye can detect.
• A 60Hz TV can refresh the screen 60 times per second, while a 120Hz on the iPhone 13 Pro can refresh the screen 120 times per second. The higher the refresh rate, the more times per second the screen is refreshing its pixels.

Adaptive Refresh Rate

• When a display has an adaptive refresh rate the refresh rate changes from 10Hz to 120Hz depending on the content being played.
• So, a static website will be played at a 10Hz refresh rate and a game at a 120Hz refresh rate.
• This means there is little chance of under delivering or over delivering refresh rate.

https://indianexpress.com/article/explained/this-is-how-adaptive-refresh-rates-on-iphone-13-pro-and-other-phones-work-7518529/

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