Quote Originally Posted by Prof_Pixel View Post
There is no trick or magic about the retina displays - it's just that the pixels on the display are small enough that the eye can't resolve the individual pixels. Blow the image up to a larger size (with an enlarger or whatever), and the eye is able to resolve the individual pixels.
I'll have to read into how exactly the display works, but from what I understand, it essentially puts the pixels slightly out of focus. Which is why the anti-aliasing effect of the iPhone camera processing isn't as apparent as it is on a computer screen.