LED is just another form of back lighting, it is still a type of LCD.
Plasma is another animal.
What is the Difference between LCD and LED HDTVs? — QVC.com
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First, the technical side of things: to truly understand the difference between LCD and LED, one thing is very important: LED (light-emitting diode) TVs are actually a type of LCD (liquid crystal display) television. LCD HDTVs use standard compact fluorescent tubes to illuminate the picture. LED HDTVs, on the other hand, replace those fluorescent tubes with backlighting technology. This technology adjusts the picture beyond the capability of those fluorescent tubes to create much clearer images, and is the main difference between LCD and LED.
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