"Screen border" on 13 inches so thick?

Not sure what the official term is, but why is the screen border on the 13 inch screen so much thicker than 15? For appearance sake, it seems more logical to extend the screen or make the whole thing a bit smaller. I've always wondered that and it's always irked me.

See the difference? The 15 inch has a much smaller border.

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via msnbcmedia4.msn.com