Where can I get an OEM screen for the 3T?

I bought my One Plus 3T through eGlobal Central in december. A few weeks ago I dropped it from 10 cm (I was sitting on the floor) and it got a little crack on the screen even though it had a big case on it. Anyways, it didn't interfere with the screen itself so I wasn't bothered much. Two weeks later I find my phone is turning purple. Two days later the whole phone screen went black.

I need to repair my phone, I have a little experience (I've repaired around 20 iPhone screens), but I cannot find an OEM screen anywhere. Can't repair through oneplus either right?

How can I come out of this mess? Thank you