Problem??? U2713H backlight bleeding

I just got a U2713H on 18/02/2013 then i tried to use it and found when use black background the 4 corners all have backlight bleeding

I know all IPS panal have this issue but this is the most "heavy bleeding" I never ever used before( include some dell IPS 22 24inch)

the 2 up corners is ok but the 2 down corners almost yellow. especially the left down corner the light bleeding is too strong.

I don't if all U2713H are like this , is it normal????I saw some people post their 2713H online with blackground is much better. I think I'm going to ask for a replacement.

so sad!