I-phones display has cracked in the middle

Hello,
I have own an Apple Iphone and it was functioning properly. After installing an application there has been a horizontal broken mark in the screen while the menu screen. Other than that it is fine. I do not know what happened. I also tried uninstalling the application and restarting the device but that did not work either. please give me suggestion so that I can get through this problem.
Maverick Bozo
