Viewing blacks on a 20 inch display in a dark room

I've just bought an Apple 20 inch Cinema Display for my Mac Mini and have noticed that there are "bleached" out areas in each corner of the screen.
This is only visible when the room is dark and the screen is displaying black. It isn't noticable at all in daylight or when veiwing any other colour than black.
I use my Mac Mini and Cinema Display quite a bit for watching TV and DVDs and find it distracting.
I'm guessing it has something to do with the backlight. Does anybody know if this is a characteristic of the Apple Displays or just a problem with the one I have?
Mac Mini Mac OS X (10.4.6)

You need to display a test pattern. You need to find a test patter that displays "Black" or 7 IRE as a field, and then displays below black or 0 IRE. Reference black is 7 IRE and is what you monitor should be calibrated to display. This test pattern is often called a "PLUGE" pattern. What you have to do, is to adjust the brightness of the monitor (not the contrast) just until the point where 0 IRE and 7 IRE look identical to you.
It is quite common for LCD displays to not be able to conform to this test and still perform within spec in other areas, like absolute contrast ratio for white values. LCD displays are simply not very good devices for displaying video. If your LCD cannot conform to a proper PLUGE and still operate correctly at the other end of the spectrum, then you should up the brightness a bit and live with the fact that it won't perform to spec, which means that very dark scenes will not be detailed enough, and that in low ambient light situations, the actual backlight artifacts might overpower the display on black / dark scenes... somewhat of a design flaw or trait of the display given its budget / quality of construction scale.

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Viewing blacks on a 20 inch display in a dark room

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