Several users have complained of a 'stage light' anomaly in their MacBook Pro displays. iFixit wrote in a blog post that it has identified the cause of the issue and attributes it to the manner in which the display cables connect to the display controller beneath the Touch Bar. This design causes the cables to tear overtime giving the uneven backlighting effect when the display is opened beyond a certain angle. More worrisome, however, is the fact that getting it repaired can prove to be a costly affair.
https://www.notebookcheck.net/iFixit-Apple-MacBook-Pro-stage-light-issue-turns-a-6-problem-into-a-600-disaster.397341.0.html
Apple takes those screens, repair them 6$ themselfs and sells it back to the customer for 600$. This is of course after they refuse to repair it in warranty and rip another 600$ from consumers.