I have a Samsung UN40B6000 LCD panels with the lighting provided by LED's situated around the perimeter of screen.
While this configuration may be energy efficient, it does pose some unique problems.
Flashlighting and clouding can be BAD as some owners have found. Luckily my set is pretty good.
The set does turn off/dim the LED's in regions to help increase contrast. One problem with LED's on the perimeter is that you get a weird pulsating effect in the picture as you get a small bright object going across a dark background i.e. a shooting star moving across the screen will get brighter and dimmer as the set tries to maximize the contrast in different zones. This effect is resolved with the newer (and more expensive) sets that have LED's evenly distributed across the back of the panels.
