http://forums.macrumors.com/showthread.php?t=1201780

There is no 300dpi limit for a "Retina" display
I know this has been said, but it bears repeating.

I've been seeing a ton of posts about the so-called 300dpi limit for a display to be retina. Many of these have been recently with talk of a larger screen iPhone. Well, hate to disappoint, but theres no such thing as a 300dpi limit for retina. It doesnt, and never did, exist.

In the iPhone 4 keynote last year, which you can go watch right now, Steve said that if you hold a device the size of the iPhone AT 12 INCHES from your face, the eye will not distinguish pixels past 300DPI. This is a 3.5' display held 12 inches from your face (And even that claim was challenged)

The calculation for "Retina" depens on pixel density, screen size, and distance from face.

If the iPhone 5 has a 4" display, it'll be assumed that you'll hold it 14-16" from your face, thus the DPI count can be lower (270-280) and still be Retina.

Hope that helps.

iPhone 4的发布会也并未指出300是所有尺寸屏幕的标准。

显然苹果取了其狭义指代，特定当时的场合。

别替别人说话好么

引用:

原帖由 利露 于 2012-3-8 08:38 发表
发现教主云鹤西去之后，苹果除了堆硬件，就连外观都不变了

苹果的外观被谁超过，必须改变了呢