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What is the difference between LED TV, LCD TV and Plasma TV ?

Is the LED technology TVs available in India are good ?

What should one look for if buying LED TV ?

Thanks in advance..

Question1:

1.In general LED consumes less power than LCD.Plasma.
2.Also LED comes up with 3D option.
3.LED with 3D is going to stay for another 5 years.

RRK;368659What is the difference between LED TV, LCD TV and Plasma TV ?

Is the LED technology TVs available in India are good ?

What should one look for if buying LED TV ?

Thanks in advance..

Differences between LCD, LED, and Plasma

Not much difference between LCD and LED. Both use the same technology, i.e, they use a backlit source (all the pixels have to be backlit, and don't emit light on their own). LCDs use CCFLs (cold cathode fluorescent lights) or HCFLs (hot), while LEDs as the name suggests use LEDs for back lighting.

Plasmas and OLED (new technology not yet commercialized) on the other hand are considered to be emissive, meaning each pixel is its own light source. OLED uses 2 charged electrodes and carbon based films to light up the pixels. Plasma uses as the name suggests plasma discharges to excite nearby phosphors which makes what are termed as plasma cells glow.

LEDs are thinner than LCDs are more energy efficient. LEDs are grouped into various categories based on back lighting.

[QUOTE]
Full-array without local dimming: The rarest of the bunch but the most familiar in concept. These models are just like standard LCD-based TVs aside from the fact that the CCFL backlight is replaced by LEDs. The "full-array" means that the LEDs themselves are arranged behind the entire LCD panel, not just along the edge.
Picture quality impact: No difference compared with standard LCD.
Example below: Sharp LC-46LE700UN

Edge-lit without local dimming: The most common today. Chances are if you see an "LED TV" advertised, it's this variety, which was first widely introduced by Samsung in 2009, then imitated in 2010 by just about everyone else. It's characterized by thin cabinet designs--around just an inch or even less in depth--that lead to decreased weight in shipping and wall-mounting, along with increased bragging rights (although we fail to see much practical appeal versus a standard, 3-to-5-inch-deep flat-panel TV). Unlike full-array models, the LEDs on these sets are arranged only along the edge of the LCD panel, and can illuminate the center and other areas of the screen using so-called "light guides."
Picture quality impact: No major advantage over standard LCD, and can have even more uniformity problems, such as brighter edges compared with the middle.
Example below: Samsung UNC6500 series

Full-array with local dimming: The original and still the best. There are exceptions, but in general, TVs with this LED backlight configuration are the best-performing LCDs you can buy. They're similar to full-array models, but the individual zones of LEDs can be dimmed or brightened independently.
Picture quality impact: Can have significantly better black levels and uniformity than normal LCD, but will also exhibit "blooming," or stray illumination, to some extent.
Examples below: Vizio XVT3 series, Sony XBR-HX909 series

Edge-lit with local dimming: A new innovation for 2010, currently available on select models from Samsung, LG and Sony. The idea is to allow some dimming of the screen in independent areas without having to place LEDs behind the LCD panel, just along the edge.
Picture quality impact: In our tests, the Samsung preformed relatively well and the LG did not, although neither matched the picture quality of full-array with local dimming and both exhibited more blooming.
Examples below: Samsung UNC8000 series, LG LE5500 series


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Don't know the current prices in India.

The part about the different types of LEDs available in the market is very important. Not all LED TVs are same though they are all represented as LED TVs. There is a big difference in price between full backlit LEDs and edge lit LEDs. Most of the low priced LED TVs are edge lit. Thats the most important thing to look at while buying LED TV.

Refresh frequency is another important thing especially if one is going for a higher size >40 inches. The available ranges are 60 Hz, 120 Hz and 240 Hz.

I cannot articulate the technical differences between a Plasma and a LCD, however when we were looking to buy a HDTV a few years back we found Plasmas to be lot more sharp with a much better viewing angle, bright colors and contrast. On the other hand LCDs were a little dull (relatively) when compared to a Plasma. Plasma TVs are a lot more heavier than LCDs.

We were told that a Plasma consume lot more energy than a LCD, however we have not noticed any difference. With a 4 years old and his nurse at home whole day, our TV is on at least 8 hours a day and our electricity bills have been quite average.

Plasmas do have the best picture which will be matched by OLEDs. LCDs and LEDs can't quite match the black levels or the picture quality. Two more things LCDs suffer from, motion lag as well as viewing angle. With LCDs you have to pretty much be right in front of LCDs. LEDs are similar even though the ones with local dimming option have better black levels. Viewing angle is limited in both LEDs and LCDs. Plasmas have better viewing angles and picture quality is terrific.