Sounds like your display is just damaged. Only way to verify that is to slap on a replacement screen and see.
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You can 1) Order a screen and attempt to fix it yourself 2) Browse your area for a mobile repair shop. [br]
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[guide|124779] [br]
Looking at the guide, I would say if you have not done this before to let someone else do it. Of course, screen repairs are not cheap, but I would trust someone who has a good repair rep to handle this for me. [br]
You can even discuss it further with the chosen repair shop to see what else they can offer you. Back up data and transfer to another drive, etc. [br]
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Hope this helps.