TS1502 while i was using my iphone 4 the colour chnages to some kind of blue. Restmy phone is working. how i can fix it?

while i was using my iphone 4... its screen gets light blue in colur rest all is working as usual... how can i fix it?

See this Discussion...
https://discussions.apple.com/message/19521062?ac_cid=sa123456#19521062

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