I think some of the users here are missing a key point of the Apple warranty in that it does not include cosmetic issues, and this most certainly falls in that category.
This Warranty does not apply: (a) to consumable parts, such as batteries or protective coatings that are designed to diminish over time, unless failure has occurred due to a defect in materials or workmanship; (b) to
cosmetic damage, including but not limited to scratches, dents and broken plastic on ports; (c) to damage caused by use with another product; (d) to damage caused by accident, abuse, misuse, liquid contact, fire, earthquake or other external cause; (e) to damage caused by operating the Apple Product outside Apple’s published guidelines; (f) to damage caused by service (including upgrades and expansions) performed by anyone who is not a representative of Apple or an Apple Authorized Service Provider (“AASP”); (g) to an Apple Product that has been modified to alter functionality or capability without the written permission of Apple; (h) to defects caused by normal wear and tear or otherwise due to the normal aging of the Apple Product, or (i) if any serial number has been removed or defaced from the Apple Product.
http://www.apple.com/legal/warranty/products/ios-warranty-document-us.html
Now if you want to return within the return policy it's all good. But some here think that months after, Apple will replace the device or the display. They most likely will not as it does not hamper the usability of the device and is purely cosmetic.