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Buying a TV has become as complicated as selecting the right mobile phone plan. Before large flat panel displays invaded our lives, the only real question when purchasing a CRT (cathode ray tube) TV was how big did you want it and how much space did you have in your room to house it? Sure, there were some quality issues but mostly it was dictated by how many diagonal inches you could get for your buck. While some of that justification still rings true with today's TVs, now there's the issue of plasma versus LCD to contend with, and just when you had that sorted out, LED TVs have entered the arena as an option. However, there still seems to be a fair bit of confusion surrounding what exactly an LED TV is. Well, basically, it's another form of LCD TV that uses LEDs to provide its light source.

All LCD TVs are backlit because LCDs are a transmissive type of display technology, which means they don't produce their own light. So for an LCD television to produce an image on the flat panel display, its pixels have to be backlit by a separate lighting source. Currently, most LCD TVs used CCFL technology (cold cathode fluorescent lamps) as their backlight source. They deliver good colors and brightness, and decent contrast, but not great blacks - the domain of the plasma TV. But TVs utilizing brighter LED backlighting can achieve much better blacks, as well as brighter colors and even greater contrast ratios (Toshiba Regza 55X1 is boasting 5,000,000:1). NB: Contrast is measured from the darkest lit area of the screen to the brightest area to give a ratio.

But just in case you thought your selection choice was now made easy, there are a couple of LED options - full matrix LED and edge lit LED TVs. Let's go through the differences and look at what some of the manufacturers are using as their preferred backlighting choice.

A true LED TV is one of those giant screens you usually see at outdoor stadiums, at grand prix events and rock venues. They are large screens made up of thousands of extremely bright LED lights. But because the size of LEDs are mostly too big and chunky to use in TVs, but they are an ideally suited as a light source for backlighting LCD crystals.

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