This article will provide a basic understanding of the differences between an LED TV and an LCD TV.
What is a Liquid Crystal Display (LCD):
An LCD display has two layers of glass that are polarized and joined together, the liquid crystals then pass or block the light to display the television picture. The crystals do not produce any light as the light comes from a series of lamps at the back of the screen. An important thing to understand is that LED TVs and LCD TVs are both liquid crystal displays (LCD).
On an LCD TV, the lamps at the back of the screen are fluorescent lamps. The LCD TV will have a reflector and a series of lamps that lay horizontally to provide light to the display.
On an LED TV the lights at the back of the screen are Light Emitting Diodes (LED). LEDs are just tiny light bulbs that fit easily into an electrical circuit. They do not have a filament that will burn out, and they don't get especially hot.
LCD TVs provide a good picture, but when compared side-by-side, generally an LED TV will have better black levels and contrasts. The color accuracy will also be better on an LED TV than on an LCD TV
In general an LED TV uses less light to display a picture. The use of Light Emitting Diodes makes it possibe to produce a better quality pictures while also using less power than LCD TVs.