Screen broken, stays black

I was on my laptop and I looked at my phone and I saw a row of pixels just black out, and after that they started flickering. So I put my phone away and I looked at it again and when I pressed my powerbutton and the lower side of the screen started flashing. Now it's blacked out and when I slap on it and then it works, but when I move it for just a centimeter it blacks out again. and it starts flickering on the lower side. My upper side is totally blacked out. But sometimes my screen lights up, but the lower side has a white glow over it. And the row of pixels that is gone keeps being visible. How can I fix this?