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We all think that the iPhone and iPod Touch screen is exactly the same, according to audience reaction and some of the test results, the fact is not the case.
IPod Touch screen on the part of some pan-gray-black, some bleaching shadow detail, and not enough black part. The chart is the iPhone and iPod Touch contrast (Zoom), the attention to her hair:

Respectively for the upper and lower iPhone and iPod Touch
Gray test:

Gray testing (from top to bottom, respectively iPod Touch and iPhone)
In the above two tests screen brightness is 50%, automatic brightness settings under closure.
While there is no large-scale statistics confirm this problem, but at least two tests this iPhone and iPod Touch, the iPod Touch screen is manifestly iPhone so good.