LED means Light Emitting Diode. Think of them as tiny little light bulbs. There are three colors, Red Green And Blue. On an LED screen one pixel means those three bulbs. Put a bunch of them side by side and turn them all on at once you have the color white. So by dimming one bulb and brightening another you can make all sorts of colors. Thats how LEDs work. Idk bout plasmas. :P
plasma are rubbish, it will brake after 3 years.
LEDs are better plasmas burn out to quick.