Retina Display is the name Apple have given their high-density, tiny pixel display that is used on the iPhone 4 and 4S. Apple claim that developing pixels at 78 micrometers wide, they have been able to pack four times the number of pixels into the 3.5 inch screen, making text and graphics look smooth and continuous at any size.
You can check out the comparisons between the 4S display and the 3G display on Apple's iPhone features page, along with further information about the development and deployment of Retina Display for the iPhone.
So, as you are able to view images in such sharp detail, there is a plethora of Retina Display wallpapers available for iPhone users. Here we have collected 50 wallpapers including comical, cartoon, photographic, minimal, and more – a selection that should hold some appeal for all users.