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It's not so much that there's a dark band, but there's a brighter line of light at the very top coming out from under the frame. Put something over that thin line of light and see if you notice the top band as much.
I think it's more to do with an imprecise placement of the screen in relation to the frame, so if a little extra light leaks from either the top or bottom, it gives the illusion of a dark band because of the contrast from that light leak to the normal brightness where the page really begins.
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