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iPhone 4's Retina Display: What Is It?

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Apple iPhone 4

The iPhone 4 features what Apple calls a "Retina Display."

Apple
Definition:

Apple calls the display on the iPhone a "Retina Display," saying it offers more pixels than the human eye can see -- a claim that has been disputed by some experts.

The iPhone 4's Retina Display features a resolution of 326dpi (dots per inch). When announcing the phone, Apple's Steve Jobs said that 300dpi is a "magic number," because it's the limit of the human retina to distinguish pixels. Because the iPhone 4's display features a resolution higher than the magic number, Apple says it will always look smooth and clear.

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