The iPad 3 is going to have an amazingly sharp screen. Like the iPhone 4S, users won’t be able to see the individual pixels of the iPad 3’s retina display because all 3,145,728 pixels will be densely packed together at 264 pixels-per-inch.
Ok, that’s cool, but what does that actually mean? Well, it if you wanted to get the same amount of pixels into the iPad 2 using its current technology you’d have to use a 19inch screen. The iPad 3 packs more pixels total than a 42inch LCD TV.
Here’s a couple other visual comparisons: