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SpokenTruth said:
Jumpin said:

How can a 720p screen render higher than 720p? That doesn’t make sense to me.

The screen itself doesn't but the image is rendered internally at the higher resolution and then reduced back to the screen resolution.  It's a form of anti-aliasing but it's very taxing on hardware...more so than any other form of AA.

Here is the difference supersampling can make. 

https://www.technopat.net/wp-content/uploads/2014/10/ssaa-anti-aliasingnedir.png

To be fair supersampling on 6.2" screen loose purpose, not to mention that rendering at higher resolution would kill battery even faster.