It could be back-light “bleed”. This is present on pretty much all LED monitors and TVs BUT, the amount seems to vary greatly. I have what was a fairly expensive Samsung monitor (215TW) where the effect is all but non-existent. Our cheapish Samsung TV is very disappointing with bleed visible on all four sides.
It is tempting to think the more you pay the less the effect…possibly.
The slight puzzle from your description though, is that you imply a sharp cut-off between lit pixels, and non-lit. Bleed is bright(ish) at the very edge, and then fades (pretty quickly) as you move to the centre.
It is hard to be sure what could be wrong without seeing it.
It would be useful if you could try it with another computer, or try another monitor with your laptop and see if the fault is still present (i.e. is it the graphics card in the laptop).
I don’t know anything about this particular model so don’t have a “feel” as to its supposed quality, however, if you don’t see a lot of reviews saying how bad it is, I am half thinking it could be faulty.
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