Probably more of a physical issue than a Windows Phone specific issue, but hopefully someone can still help.

A few months back I dropped my phone and cracked the digitiser. I ordered a replacement one of eBay and installed it myself and works well. Unfortunately since then my LCD screen has had major gradient banding issues (making videos and pictures odd-looking), likely due to, I'm assuming, rough handling of the LCD screen when dismantling the phone to replace the digitiser.

I'm assuming that this being a physical issue would be nigh on impossible to fix? 

And if it is impossible to fix then where to buy, and how much it would cost to fix? And whether this would even be worth it?

Would really appreciate some help. Thanks heaps in advance.