One of the criteria that led me to buy a DLP projection TV over the LCD option (other than price), was that unexpected quirk. I DID see the color separation or "rainbow effect" on a few large screen LCD TVs, but I DID NOT see any on the DLP TVs in the store (Beast By)!
Also some people claim that a good way to sense and check for this phenomenon is too look at one portion of the screen, then quickly shift your eyes focus to another separate point on the screen, watching for the color artifacts during movement. Others say to view the scrolling end titles on a movie (DVD or cable broadcast), where the effect often shows up.
why is it that on my Samsung LCD HDTV that on HD programmings that some people's clothing "flashes" or "glowes" sometimes depending on the color of the clothing.