What will back-lit monitors do for a TN panel exactly. Nullify backlight bleed, and improve the quality of dynamic contrast? Will it help viewing angles any?
Yes, it (should) nullify backlight bleed and help dynamic contrast alot. I dont know about viewing angles but if you look at hi-res videos from CES 2011 you can see that these monitors have excellent viewing angles, black levels and generally great picture quality/colors (samsung claims 100% sRGB coverage). They also say that its not only their top-of-the-line 3d monitor, but the top 2d as well.
According to samsung its not just any TN panel, quoting the samsung representative at CES its a "proprietary, samsung only" "best possible" TN panel, and judging by the footage i agree.