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LED is Light Emitting Diode. It provides the light source for a flat panel TV.

LED TVs use a liquid crystal screen. Liquid crystal does not emit any light of it's own, the pixels of the screen act as shutters and need a backlight to shine through it.

Early LCD technology, used very thin fluorescent lamps that were powered by high voltage from an inverter. These used a lot of power, were very delicate and ran quite warm.

Once pure white, bright, LEDs could be produced cheaply, then these are a better option, for providing the backlight.

They are solid state and use less power.

The next generation being developed is OLED. Which is 'Organic Light Emitting Diodes'.

This gets away from LCD technology and uses an array of LED's as the picture elements themselves. At the moment, large screens are hard to make and expensive.

Super large screens used at football stadiums, use LEDs as the pixels, providing the picture content and illumination.

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Meta Hirthe

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