Mi4 Screen Problem

The screen was perfectly good untill yesterday, and today morning when i woke up I saw vertical lines on the display. Tried turning it off, removed temper glass but the problem is still there. When the mobile is turned on from sleep, the display is perfectly fine but the lines appear slowly after 2 seconds. So is this a major or a minor hardware or a software problem. I have also posted the screenshots.

Thanks.

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