If the screen is displaying the same thing (think an “always on display”) then why does lowering the refresh rate help with battery if the pixels are still lit?
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1. Lower power consumption from the CPU and GPU as they don’t need to prepare and render that many frames
2. Lower power consumption from the LCD panel – it takes power to flip the little crystals from transparent to opaque, and generally the faster you want something to work, the more power you need to pump in it, though I think that last part is only relevant if the screen also switches to a slower response time.
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