What Does a 120-Hz Refresh Rate Mean, Anyway?

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What Does a 120-Hz Refresh Rate Mean, Anyway?
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Here's what you need to know about screen refresh rates for smartphones, TVs, and monitors.

can reach a 120-Hz refresh rate, as can several phones running Google's Android OS.

High refresh rates are also talked about a lot in gaming, where fast reactions and instant onscreen updates can mean the difference between victory and failure.All content on your display is made up of individual still frames shown in sequence at a very high speed. The refresh rate is measured in hertz , and it dictates how often the frame can change. A refresh rate of 120 Hz allows a new frame to be displayed up to 120 times every second.

The cost is often your battery life. Refreshing the image on a display more times per second requires more battery power. Processing power is also needed to run graphics at a higher frame rate. Processors have improved enormously, but battery life is still limited on smartphones. For that reason, most phones with high refresh rates do not run at the highest rate all the time.

, which have an “adaptive” 120-Hz refresh rate, which scales up at select times, when you're more likely to notice the difference.

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