LED TV has brought a whole new range of tv's to the electronics market, citing breakthrough picture quality in an energy-efficient and eco-friendly package. But what is an LED TV and how does it compare to an LCD TV?
Most of the LED televisions out there aren't in fact true LED displayhs - many are actually an LCD panel with an LED backlight, which can cost up to twice as much an older LCD TV and three times more than a plasma TV.
So why have a LCD with an LED backlight? Until now tv's used florescent tubes to light the screen. As these tubes are always on, some light would always leak through and so the display had trouble producing deep blacks, which affected the perceived sharpness. The tubes also lacked a wide range of colours, meaning the colour saturation of the image could be limited.
An LED TV uses light emitting diode's to illuminate the display by mounting tiny lights in rows either behind the display or around the edge of the display (known as 'edge-lit' displays).
Each method has its own pros and cons - the thinnest versions are edge-lit, as the diodes are placed around the edge of the display. As there's fewer light emitting diodes in them than backlit displays, they also tend to be cheaper.
However, backlit displays are able to create much deeper blacks that edge-lit displays using the 'local dimming' technique, where diodes are shut off in black areas of images, stopping any light from leaking through. Of course these extra bulbs come at a price, and backlit displays can cost significantly more.
But while backlit may sound like the better of the two, there are technicalities. Backlit tv's have many more diodes which would be too expensive to shut each off individually, so are shut off in larger groups. This means that in areas where light pixels meet dark ones, the light areas of can show darker than desired and the dark areas lighter.
The alternative is a true LED screen that lights every diode separately, which would be very expensive and is only really seen as large billboards owned by major companies placed in high traffic areas.
Although the black levels are somewhat debated, there are some clear advantages of LED over LCD and plasmas. LED panels tend to use less power and don't use mercury, which can be harmful to the environment. They tend to be well balanced in colour and contrast too, providing more vivid and sharper images.
There are pros and cons for all tv and as with any big purchase it's important to fully research your options before you buy. Go to your local retailer and compare the tv's in store for yourself. Take a note of the tv's specification and compare it to your requirements and budget. Once your happy, take it home and stay enjoying some great tv!
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