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Yes, but almost every LCD screen has that to some extent, if you look carefully enough (i.e. in a darkened room and with a completely black screen image)[/B]. If the contrast ratio is 1:800 in the middle and 1:400 at the edges, the edges will look 2x brighter than the middle, but the contrast...

I think most LCDs have some irregularities in the backlight with dark imagery. Did you try the contrast ratio test (with a digital camera) on http://www.lagom.nl/lcd-test/contrast-ratio.html ? You could measure it at several points on the screen. If it is within specs everywhere on the screen...