If it were not for the light emitting diodes, the LED TV would be same as the LCD TV. The latter makes use of the liquid crystal display technology for displaying the images and videos on the screen whereas the former makes use of the light emitting diodes for the backlighting purposes.

Some of the main features of these new age TVs are:
1.These are more practical in the sense that these can packed easily and can be fixed on the walls. This might seem to be a bit unnoticeable point but has great utility in areas of limited space. This is possible due to the sleek and slim designs of these TVs. The old CRT TV was quite bulky, had more depth which limited its placement on some cabinet. This also caused hindrances to the movement of people.
2.These LCD and LED TVs from reputed companies like Sony and others support the high definition features of the images and videos. This means that if the videos have been shot and recorded with cameras having more than 2 MP resolution levels, then these can be seen on these TVs with good deal of clarity.
The LED technology is considered to be a shred better than the LCD TV
The improvement in the display technology has resulted in the making of these TV sets. The LED TVs are very costly and this is the reason for their limited entry into the drawing rooms of the people. The OLED TV, a further improvement over the LED TV does not require even the backlighting. It makes use of the Organic light emitting diodes for this purpose.
The researchers at top companies of the world, like Sony are always working on newer technologies to further improve the display technologies and devices. This improvement is now sought to be introduced in the SED technology. This is believed to hold a lot of promise for the future since it combines the best of the old and the new technologies.