LCD and how it works is on the web. But here's the deal. Folk new to this technology want absolute consistency over the display area. We only saw that on Plasma and some projection displays. LCD and the way it works will see variance across the panel under some conditions.

Mostly you have to push it to see it. For example, a dark room with an all black screen should show what I see above (on LCD.) How to share how this technology works is a challenge.

But for normal use with a moving image, you rarely spot this issue.