Some Retina iPad mini displays have an image retention problem
Many first-generation Retina MacBook Pros exhibited an issue where a faint remnant of an image persists on the screen even after a new image replaces it. The issue seemed to be tied to Sharp-manufactured units, and seems to be present in certain Retina iPad mini units as well, presumably, the ones with displays made by Sharp.
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http://feeds.iphonehacks.com/~r/iphonehacks/~3/ZzuT3DGK-AI/retina-ipad-mini-image-retention.html
