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There was a great write-up recently on displaymate that explained how the dpi on one Apple Retina display is not necessarily the same as another Retina display. To oversimplify, the pixel density needed for individual pixels to be indiscernible decreases as the distance from the viewer increases. An example would be a jumbotron type LED display, where that actual size of pixels is huge, but from a distance it looks almost as clean as an image on your household television. Thus, the pixel density on the iPad is lower than the pixel density on the iPhone, because one would in theory hold the iPad further away from one's eyes, yet both qualify for Apple's "Retina" moniker.