Eli5 : what is vrr ‘ variable refresh rate’ and why is it useful?
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On a smartphone, VRR is used to save battery. So, let’s assume you’ve got yourself a brand new phone with a screen capable of a refresh rate of 120Hz. That means, the screen refreshes itself 120 times per second, even if it’s just displaying the default static wallpaper of the homescreen, which leads to higher battery drainage.
With VRR, the phone can detect if the image is still, and decrease the refresh rate to, say, 1Hz. Then, as soon as you the image moves, it increases again to 120Hz. Therefore, you are saving tons of battery.
It also works with content, of course. If you’re watching a 60fps YouTube video, then the refresh rate will cap at 60Hz while you’re watching, and so on. This goes more along the lines of what other comments have already explained.
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