My iphone 4 screen goes very dark when i unlocked it

my iphone screen suddenly goes very dark when i unlocked it.
i already push the power adn home button at the same the and it fixes just for awhile, then it goes dark again. my iphone is still working, when somebody calls, it still ringing and i can hear the "click" sound when i lock the phone.
i reset all the setting on my iphone but then the screen goes dark again. is that any problem with the software or hardware? please advice
thanks

Just what do you think we can do for you? You broke your phone again. Get it fixed or buy a new one.

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