LED backlit and LED

Most of the TV companies push LCD TVs as LED TVs. This has been quite confusing in the last few days when I was looking for an LED TV. Now I know the difference and it is big!

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 several 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.

Compared to regular CCFL backlighting, an LED backlight provides higher brightness and improved color gamut. However advancements in CCFL technology mean wide color gamuts and lower power consumption are also possible. Cost is the principal barrier to wide use of LED backlighting on LCD televisions.

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 was possible because the combined light output from red, green and blue LEDs produces a more pure white light than is possible with a single white light LED. 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.

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 benefit 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 have also introduced Edge-LED lit LCD televisions with extremely thin housings.

LED-backlit LCD TVs are considered a more sustainable choice, with a longer life and better energy efficiency than plasmas and conventional LCD TVs

he XEL-1 is the first OLED television produced and released by Sony in 2008, it was the world's thinnest television during its production at just 3 mm. It is also the world's first production television to use an Organic Light Emitting Diode display. It has a screen size of 11" with a native resolution 960x540. As the screen is too thin for I/O ports and buttons, Sony has connected the screen to an irremovable base that contains these. The top of the base has the speaker, the Power, Volume, Channel, Input, and the Menu buttons, which are backlit so the symbols and abbreviations change when the XMB is accessed. The back of the panel has a DMeX service input, a 16 Volt DC input, a VHF/UHF/cable input, a Memory Stick slot, and two HDMI inputs. On the left side of the panel there is an Analog/Digital audio output. The XEL-1 has a very high contrast ratio of 1,000,000:1, high color saturation, large viewing angles, high screen uniformity, and low power consumption^{[citation needed]}. On the other hand, it has poor primary color accuracy, a quarter of the Full HD resolution (1920x1080p), no anti-judder processing, a light-reflective screen, a minimal number of inputs, an irremovable panel, a small screen.

OLED is much more expensive than LED backlit and a needs more research to remove the issues around it make  it commercially viable. 

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