Re: TV Buying Guide - LED (LCD) or Plasma (Update-1)
Light output (brightness)
Winner: LED TVs
Loser: Plasma TVs
Runner-Up: LCD TVs
Without question, LED TVs are the brightest panels you can buy. Some models are capable of well over 100 footlamberts. To put that in perspective, in a movie theater you're lucky if you get 5. LCD TVs are a close second.
Plasma TVs just aren't that bright. It's all relative, though, as plasmas are still likely way brighter than old-school CRT tube TVs. So plasmas aren't "dim", but they aren't nearly as bright as their LCD and LED counterparts.
The question is, do you need that light output? In a dark room, 100 footlamberts will be searingly bright. In a bright room (daytime/sunlight) a plasma might be hard to see.
Another aspect to consider is any antireflective or antiglare material on each screen. A plasma with a really good antireflective coating may be better to watch with room lighting than a glossy-screen LCD with no such coating (and vice versa).
Black level
Winner: Plasma TVs
Loser: LCD TVs
Runner-up: LED TVs
This is getting a lot closer, but plasmas still offer the best black levels. Yes, LED TVs can sometimes have an absolute black (by turning off their LEDs), but when you're watching a movie, plasmas are going to seem darker. This relates to contrast ratio.
led vs lcd vs plasmas
Panasonic Viera TH-P50VT30S plasma TV.
(Click image for review)
Contrast ratio
Winner: Plasma TVs
Loser: LCD TVs
Runner-up: LED TVs
Contrast ratio, or the ratio between the darkest part of the image and the brightest, is one of the most important factors in overall picture quality. A display with a high contrast ratio is going to seem more realistic, and have more virtual "depth".
There is one exception. The new Elite LED TVs (made by Sharp) has an advanced local dimming backlight, which gives it a plasma-like contrast ratio for a steep price. One good LED TV doesn't make them all good, nor does it herald a whole new generation. The Sharp/Elite doesn't do anything new. It's an LED-backlit TV with local dimming. We've actually seen fewer and fewer of these types of displays for the reason this TV makes quite obvious: Price. These models are more expensive than LED-edgelit versions (and typically more expensive than plasmas, at the same size), and these days, expensive TVs aren't big sellers.
Do a few other local dimming models come close to the better plasmas (or exceed the lesser ones)? Yes, but again these are the exceptions, not the rule.
There are some technologies coming down the pike in a few years that may offer even better contrast ratios for LCDs. We'll probably hear more about them at CES, and if so, look forward to hearing all about it here on CNET. So, on average, plasmas have a better contrast ratio (with notable exception noted).
Viewing angle
Winner: Plasma TVs
Losers: LCD and LED TVs
Runners-up: IPS-based LCD and LED TVs (see text)
How big is your room? Do you or loved ones sit off to the side, viewing the TV at an angle? If so, it's important to note that LCDs of both flavors lose picture quality when viewed "off axis", as in not directly in front of the screen.
Small room, small couch, mother-in-law Barcalounger off to the side? Don't worry about it.
Somewhere in the middle are In-Plane Switching (IPS) LCD panels, which offer a better viewing angle at the expense of overall contrast ratio and black level.
Energy consumption
Winner: LED TVs
Loser: Plasma TVs
Runner-up: LCD TVs
No question, LED TVs have the lowest energy consumption, especially when you turn down the backlight. Toyota Prius drivers, this is the TV for you. LCD TVs are a close second, with the same addendum.
Plasmas, especially when you turn up the contrast control (which you need to for them to look their best), just aren't as energy efficient. They are, however, far better than they were a few years ago.
If you want to go green, get an LED TV. That said, it won't save you money. Because LED TVs are more expensive than other panels, it will take you years to make up that difference in energy savings (if ever). We're talking a few dollars difference in a year here.
Price
Winner: CCFL TVs
Loser: LED TVs
Runner-up: Plasma TVs
Because they tend to be at the lower-end of a company's TV offerings, LCD TVs are the cheapest panels you can buy.
As mentioned earlier, LED TVs are the technology behind many companys' high-end offerings.
The cheapest TVs will almost always be LCDs. Plasmas tend to have the best size/price ratio.
Lifespan
Tie
Multiple studies by a variety of sources have found flat-panel TVs to be extremely reliable. Internet forums are always populated by the angry, so invariably you're going to read more "well mine broke!" posts than "I've had mine for 5 years and it's great".
Burn-in
Tie
Gotcha! All TVs can burn in. It's unlikely you'll abuse them enough for this to happen (think airport arrival/departure displays). Plasmas can have image persistence, which has the outward appearance of burn-in, but isn't permanent. For more on this, check out my article Is plasma burn-in a problem?
The short version? You're going to notice image persistence long before it will become a problem.
Uniformity
Winner: Plasma TVs
Losers: LCD and LED TVs
Uniformity, or a consistent brightness to the image, doesn't bother me a lot. It bugs other reviewers, though. Check out my article Is TV brightness uniformity a problem?
Plasma can have issues in this regard as well, though they're far less frequent or noticeable. LED-edgelit TVs are the worst offenders, though cheap LCDs have their own issues. In many cases, the uniformity will vary per sample. So your TV might be fine, but your brother-in-law hates the one he bought of the same model.
And the winner is...
If you want to count wins and losses from the list above, have at it. The thing is, these items don't have equal weight. That's the point. For one person, absolute light output is absolute, for another, black level is above all else. These two performance aspects are, for now mutually exclusive.
So don't listen to those who say, "well, its brightest, it's best" or "LCD's black level is terrible, so they blow". Reading through this list I'm positive you mentally weighted certain factors above others, even if you didn't notice it at first. Go with your gut. If you watch a lot of TV during the day, or have a room with lots of windows, an LED TV is probably best. If you watch at night, and want the TV to disappear into the background, plasma is probably best.
Want to know the best part, and the dirty little secret of the TV world? If you're buying a name-brand TV, its picture quality is going to be really, really good. You are seriously picking from good, gooder, and goodly goodest here. Compared with flat-panel TVs from just a few years ago, new HDTVs are thinner, brighter, better-performing, and cheaper than ever before. So have at it. Your new TV is going to be awesome for years to come.
Courtesy: ASIA.CNET.com