Is there anything i can do to unlock my iphone 4?

Okay so i dropped my iphone in the snow about two months ago and someone ran over it. It still makes sound when i type but the screen is grey and white with a few vertical lines on it. I plugged it into my computer to try to get everything downloaded before it stopped working completely but it says "Itunes can't connect to the iphone because it is locked with a pass code and must be unlocked before it can be used with itunes". The problem is, i can't see the screen to unlock it! If anyone knows of anything i can do to fix this problem please let me know, it would be greatly appreciated!

Unlocking it won't repair it.

First of all, take your iPhone to the iPhone repairing shop or any mobile shop and have your display replaced. Then you can see display on it and enter a pass code.