My iPhone 5c s screen works but sometimes it will go black?

The only way i can get it to work is to bend my phone until the screen starts to work again(it still "works" it's just the screen is black, and i know that it works because i can unlock it even when the screen is black and i here the unlock sound) , it will go back black at least once a day. What is this? Can I get it fixed?

Might be a cable problem that connects screen to your mobile, its not hard to fix if that is the case