Samsun galaxy s3 purple screen, why?

[norbi9701]

I rooted my phone last yesterday, and it works fine, but today morning I call my sister, after hanging up, the screen get purple stripes. I locked my phone, and I want to open but the screen got a little green, followed by purple. Later the screen 2 times worked well, but after I locked the screen will be like purple. What's the problem with my phone? How can I fix it?