Iphone screen went blurry and shaky- now I have blank screen?

I dropped my phone around two weeks ago- although phone had been fine since. Last night however, I was using my phone as I normally do when my screen started going shaky and lines began going through it, I turned my phone off and on again which did not help. now finally, the screen has went completely blank, i can still use the screen- I can hear it unlock and take screenshots, however it just goes from white fading to black again when I do this, so I cant see anything.
I have rebooted my phone and reset to factory settings through Itunes, also have looked at my screenshots through my computer and can see that it is taking perfect image of the screen- just I cant see it!
what could this be?
Thanks so much in advance!

it sounds like you have confirmed 100% that this is in fact a hardware problem with your iPhone, and unfortunately, the only option is going to be some sort of repair.
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