lol you are talking about plasma

LED-backlit LCD TVs differ from conventional CCFL-backlit LCD TVs in the following:

They can produce an image with greater dynamic contrast compared with CCFL-backlit LCD TVs.[6]
With Edge-LED lighting they can be extremely slim. Current models on the market can be approximately one inch thick.[6]
They can offer a wider color gamut, especially when RGB-LED backlighting is used. [7]
Lesser environmental pollution on disposal.[6]
Higher cost due to current market product placement.[6]
Generally have a lower power consumption in the realm of 20-30%.[6]

Flicker due to backlight dimming
LED backlights are often dimmed by applying pulse-width modulation to the supply current, effectively switching the backlight off and on again very quickly. A screen with an LED backlight dimmed this way will therefore flicker. If the frequency of the pulse-width modulation is too low and or the user is very sensitive to flicker, this may cause discomfort and eye-strain, similar to the flicker of CRT displays

plasma...ready for burn. WAIT....wad burn mark?aint new technology already solve da problem? NO...it improved and not solve the problem...it will still hav the burn mark but the burn mark are not so visible.

LCD erm...no idea but...average lifespan around 3 years....

LED just released not long enough cant judge it