Judging by the photo it doesn't strike me as product-threatening, but you might want a second opinion.
and nothing's wrong with your English, it's perfectly understandable.
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:ADDED 08-12-09
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I fear you're looking a ta works-as-designed issue, I've seen Dell notebooks, HP All-in-one's and branded monitors you name it... displaying similar issues(Though most in a larger degree).
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-IF it really is a defective product, an applestore should be able to have it replaced, no way that's a case of Customer Abuse.
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-If it IS normal operation, no replacement part is going to resolve.
Looks like a mild case of backlight bleeding.
Judging by the photo it doesn't strike me as product-threatening, but you might want a second opinion.
and nothing's wrong with your English, it's perfectly understandable.