IPhone verticle/horizontal lines, mostly purple?

My iPhone screen was replaced not long ago, and ever since this weird thing has happened to my screen, this is what happens:
After opening phone, screen begins to fade into purple lines, vertical and a few horizontal, it's hard to explain, but the horizontal ones are usually across text. The higher the brightness the quicker it happens, when it has fully happened I can't use the touch, but can still slightly see what was on the screen. I'm more than sure it's not a moisture damage problem as my phone has never been near water, any advice as how to fix it would be greatly appreciated!

What if your phone screen was a fake? God knows how many fakes go around for iPhones and your screen might be

I think that a faulty screen was fitted to your iPhone when they repaired it, you need to contact the store and ask for them to fit a new one free of charge.

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