I don't think most of us are in a position to get creditable information from a manufacturer... it's mostly repeating what others have speculated.
I made the fatal mistake of comparing a piece of junk LCD (elcheapo model) to my reference level plasma. I did calibrate the LCD as best as can be done given the available adjustments. I was looking at differences in gamma and stumbled across how much ABL behavior there is in the plasma. It's like stuck pixels. Don't go looking cause once you see them, you can't stop seeing them.
If you're just looking around, try to find a Samsung F8000. I think it's LED based LCD. Suppose to be one of the better ones and doesn't have ABL. lol
Samsung 64F8500, Panasonic 65VT50, Oppo 95, Tivo Roamio for OTA, Dish VIP722, Marantz AV8801 preamp, Rotel Amps, Atlantic Tech 8200 speakers, Seaton Submersive HP, Calman 5, Chromapure, Accupel DVG-5000, VideoForge HDMI II, i1Display3pro, i1pro2, eecolor colorbox.