A new type of television that is receiving a lot of publicity at the moment is the LED TV. First, what are LEDs? LEDs is an abrieviation for light emitting diode which are small electrical component that produce light. Secondly, what makes LED TVs different? LED TVs are still LCD based TVs but they use LEDs to light the LCD panel rather than cold cathode fluorescent lamps (CCFL) that have been used up to this point.

LEDs come in two different variations RGB LEDs (red, green, blue) and white LEDs. RGB LEDs are used when the LCD panel is back-lit and white LEDs are used when the LCD panel is edge-lit. So what is the difference between back and edge-lit LED TVs and what significance does this have on the television?

Back-lit LED TVs use many RGB LEDs to the rear of the LCD panel to produce the light which makes the LCD image visible. There are two main benefits to this method of lighting. Firstly RGB LEDs produce a more pure white light than white LEDs do, (this might sound contradicting when considering their names, but it is a fact). The benefit of producing whiter light is that television has a wider color gamut (where gamut is the range of colours that it is possible to produce). The second benefit is that the LCD is lit by many LEDs behind the display, all of which can be individually switched on and off, this produces greater contrast ratios. Put simply if the image on the display requires very bright and very dark areas, the corresponding LEDs can be switched on or off to achieve the correct levels of lighting.

With edge-lit LED TVs, as the name might suggest the LEDs are positioned round the edge of the panel and the light is deflected through the panel by a light diffusing panel to the rear of the LCD panel. The advantage of using LEDs in this way is that because the more bulky CCFL lamps have been replaced by smaller LEDs, this type of television can be made to be very thin.

Both types of LEDs televisions have another advantage in that they are more energy efficient than CCFL based LCD televisions, reducing power consumption by 40 percent or more when compared with equivalent CCFL and plasma TVs.

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