LED Technology, TV manufacturers can use an LED backlight instead of the Cold Cathode Fluorescent Lamps (LCD-CCFL) used in most LCD televisions. LCD-based televisions described as ‘LED TVs’ are different from self-illuminating Organic light-emitting diode (OLED), OEL or AMOLED display technologies. In the UK, the ASA (Advertising Standards Authority) has made it clear in prior correspondence that it does not object to the use of the term ‘LED TV’, but does require it to be clarified in any advertising. There are many methods of backlighting an LCD panel using LEDs including the use of either White or RGB (Red, Green and Blue) LED arrays positioned behind the panel; and Edge-LED lighting, which uses white LEDs arranged around the inside frame of the TV along with a light diffusion panel to spread the light evenly behind the LCD panel.

The variations of LED backlighting do offer different benefits. The first commercial LED backlit LCD TV was the Sony Qualia 005 (introduced in 2004) and featured RGB LED arrays to produce a color gamut around twice that of a conventional CCFL LCD television. This is possible due to the red, green and blue LEDs have very sharp spectral peaks which, combined with the LCD panel filters results in significantly less bleed-though to adjacent color channels. In this way, the unwanted bleed-through channels do not “whiten” the desired color as much, resulting in a larger gamut. RGB LED technology continues to be used on selected Sony BRAVIA LCD models, with the addition of ‘local dimming’ which enables excellent on-screen contrast through selectively turning off the LEDs behind dark parts of a picture frame.

LED backlighting employing so-called “white” LEDs produce a broader spectrum document feeding the individual LCD panel filters that is more similar to CCFL sources, and hence result in a more limited display gamut than RGB LEDs. However the lower cost of the composite solution outweighs the advantages for much of the consumer market.

Edge LED lighting was first introduced by Sony (September 2008) on the 40 inch BRAVIA KLV-40ZX1M (referred to as the ZX1 in Europe). The principal profit of Edge-LED lighting for LCD televisions is the ability to build thinner housings (the BRAVIA KLV-40ZX1M is as thin as 9.9mm). Others, including Samsung have introduced Edge-LED lit LCD televisions with extremely thin housings. The Samsung LED8000 Smart TV features a .2″ bezel and is backlit with LED technology.

LED-backlit LCD TVs are considered a more sustainable choice, with a longer life and better energy efficiency than plasmas and conventional LCD TVs. Unlike CCFL backlights, LEDs use no mercury in their manufacture. However, other elements e.g. gallium and arsenic are used in the manufacture of the LED emitters themselves, meaning there is some debate over whether they are a significantly better long term solution to the problem of TV disposal.

Because LEDs are able to be switched on and off more quickly than CCFL displays and can offer a higher light output, it is theoretically possible to offer very high contrast ratios. They can produce deep blacks (LEDs off) and a high brightness (LEDs on). However, measurements made from pure black and pure white outputs are complicated by Edge-LED lighting not allowing these outputs to be reproduced simultaneously on-screen.

In September 2009 Nanoco Group announced that it has signed a join development agreement with a major Japanese electronics company under which it will design and develop quantum dots for LED Backlights in LCD televisions.[8] Quantum dots are valued for displays, due to they emit light in very specific gaussian distributions. This can result in a display that more accurately renders the colors than the human eye can perceive.

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