Defiance II display Halo

Hello,
I recently bounght a Defiance II Laptop and yesterday i turned it on for the first time. The first thing I noticed was a halo on display corners. This halo is visible only with dark screens and does not affect normal use, but I'd like to know if it's a manufacturing defect or it's just a normal display behaviour.
I'm sorry for my bad english.

Thank you,
Marco
 
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