I've heard of RGB Sub-Pixel Rendering.
I'm wondering does the IPhone 3 have this capability (or is it that each pixels are only 1 color) ?
What about the IPhone 4?
Ask Different is a question and answer site for power users of Apple hardware and software. It only takes a minute to sign up.Sign up to join this community
They don't. The native resolution of even the original iPhone screen was high enough that there would be little added benefit.
Also note that each orientation of the screen would require a different set of subpixel rendering calculations. So it would also be more complicated to implement.
Combined, there's no advantage to use subpixel rendering on an iOS device.
...sub-pixel anti-aliasing is, ultimately, a clever hack that will eventually fall by the wayside as display resolutions improve.