Why is the screen of Doro 5516 black apart from one corner?

My phone screen has just gone black and i can only see one bottom corner.  I havn`t dropped it or done anything. I just picked it up and it was like it. Any ideas what has caused this and is it fixable?

Maybe some sort of glitch. Remove the battery, put it back, and turn it on. If the screen is still the same then you have a broken screen. Take it to the service center for repair.

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