Q: Screen goes pink then freezes

My iPhone works fine, and by that I mean when it isn't drozen pink.

ANyways, the screen is okay when I unlock the phone. It is okay dor about 10-20 sseconds then pink lines dade in and the screen freezes. But it sill works when frozen. I can still answer calls and by pressing around on the screen can use it but obviously I can't see the screen as its pink and drozen