How do I fix this issue? I don’t understand why it’s broken?

So I never dropped my iPad mini 2, there is really no reason why I have a damaged screen. But it appears with a gray haze over the screen. I tried to google how to fix it and I seen some YouTube videos that mentioned that you can smack the back of it and it would work properly but it only made it worse. I googled the symptoms of this issue again and I found some information saying that some times the magnetics parts can be shocked some how when leaving your iPad on the ground. If I am guilty of something it’s that I left my iPad on the floor ( my floor is tile . Not sure how a tile floor can damage any magnetic parts in the iPad mini 2 but if so what can I buy to did this issue ?

can any one tell me what is damaged? lCD Screen ? The digitizer? Some magnetic strips ?