The screen on my LG. the screen on my LG Viewty has frozen making it impossible to use. It was

Question

the screen on my LG Viewty has frozen making it impossible to use. It was working one moment then the screen would not repond the next. I have taken the battery out and restarted it but would still not work when i tried again.I have left it overnight whith no batterey but still nothing. All the buttons such as camera and call end work its just the screen. Can you think why? or howit can be fixed?