Depending on your viewing habits/picture settings, you might notice a difference in brightness between the two areas of the screen after only a few months. It really isn't "burn-in", it's just that the phospors are continuously aging and getting slightly dimmer with age. If part of the screen is routinely black, those phosphors won't age and dim as much. Then when you watch a widescreen image, you may notice that the sides are slightly brighter than the middle, with a hard demarcation at the pillar points.
LCD's don't age (except for the backlight, which covers the whole screen), so there is no reason they couldn't use black pillars.
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