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iPhone 12 will feature a high refresh-rate 120Hz ProMotion display. Or at least, only on the iPhone 12 Pro phones: that’s the high-end 6.1-inch and 6.7-inch models.
The phone will dynamically switch between 60Hz and 120Hz modes to conserve battery life where appropriate. This is similar to the ProMotion system available in the iPad Pro for a few years now. To support the 120Hz feature, the internal battery is also growing in capacity to maintain good battery life even when the phone is refreshing the display rapidly for extended periods.
Source
The phone will dynamically switch between 60Hz and 120Hz modes to conserve battery life where appropriate. This is similar to the ProMotion system available in the iPad Pro for a few years now. To support the 120Hz feature, the internal battery is also growing in capacity to maintain good battery life even when the phone is refreshing the display rapidly for extended periods.
Source