New Larger TVs Favor LCD Over Plasma
Posted by
Zonk
on Mon Nov 27, 2006 05:38 AM
from the shiny-writ-large dept.
from the shiny-writ-large dept.
Information Week is carrying a Reuters story examining the shift towards LCD technology in recent large-screen television models. Though some analysts acknowledge that plasma displays have faster response times over large surfaces, the industry seems to be betting that consumers will prefer higher resolution images over time. From the article: "CPT's Wu agrees that plasma panels, especially 50-inch and larger ones, do excel LCDs in some aspects of picture quality, but he says the sheer size of the LCD camp will help LCD panels overcome whatever drawbacks they have in a timely manner ...With the 40-inch-class market gradually taken over by LCD TVs, plasma models need to migrate to the market for 50-inch TVs and above, but demand is not as well developed there, analysts say. 'The United States accounts for more than 70 percent of demand for 50-inch plasma TVs and larger. In other words, there is virtually no 50-inch-class plasma TV market outside the United States,' DisplaySearch director Hisakazu Torii said."
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Energy efficiency (Score:5, Informative)
Household equipment is rated in the shops on an energy efficiency scale, and LCD screens score much better than plasma.
Furthermore, plasma has a tendency to burn in. Of course every manufacturer and salesman will tell you that "this is no longer true", but once the problem has happened they are not so firm in their statements anymore.
This causes trouble when watching 4:3 transmissions in true 4:3 format (rather than stretched to 16:9).
It also sometimes causes station logos or newstickers to burn in.
Re:Energy efficiency (Score:4, Informative)
The reason LCDs are outselling plasma displays is mainly that they are sold in brightly lit stores, where you won't easily see the enormous difference in contrast ratio. On the contrary, LCDs are fabricated to look black in direct lighting, while plasmas sometimes tend to look greyish.
Good stores should have dampened lighting in the TV dept. Plasmas are like projectors, you don't really see what they are capable of in bright light. Turn the lights down on an LCD, and you will see the disastrously poor contrast of LCD technology manifesting itself as glaring, grey areas that are supposed to represent black.
The other reason is that LCD are preadjusted to do a lot of clipping in white and black areas (which people don't always easily react to) to make the picture look less washed-out. If you correctly calibrate an LCD you will see this limitation quickly.
To further fool the customers, LCD vendors have a fantast-number called "dynamic contrast", which represents total contrast after frame-by-frame contrast distribution. It would be OK giving ut this specification, had they not omitted the real number. After all, "dynamic contrast 8000:1!" doesn't sound less cool than "contrast 5000:1". It's dynamic, like Batman & Robin. Too bad the real contrast is 1200:1.
So sure, LCDs may be better for use with a computer, but that is not the reason why they are winning the battles in the elecronics stores.
Re:Energy efficiency (Score:5, Informative)
No they don't. Plasmas suffer burn-in because they emit colors in the same way as a CRT -- using red, green, and blue phosphors. "Burn-in" happens when the phosphors age non-uniformly, such as when a static image is held in place too long. You can combat this by properly setting your contrast (TVs are set to torch mode in the stores because it looks better under the flourescents; at home you should have your contrast set to a much lower level) and by pixel-shifting, but you can't eliminate it so long as the technology uses a consumable resource for emitting colored light (phosphors).
LCDs and DLPs don't burn in because they use filters over white light to emit colors. DLP does this with a color wheel rotating anywhere from 10,000 to 30,000 times per second, with the DMD adjusting for each window of the wheel to emit the correct amount of the base color of light (basic wheels contain red, green, and blue filters. Better wheels double up on the colors and often add several different shades of blue and green since our eyes are more attuned to those colors than red. Non-consumer high-end models have individual DMDs and filters for each color). LCDs have discrete filters for red, green, and blue, and the liquid crystal is set to a state to allow just the right amount of each through (thus you can do sub-pixel rendering, such as Cleartype font-smoothing). But it's still all about emitting filtered light, not emitting colored light from a phosphor. Your backlight may go out, but that's replaceable. Good luck replacing individual phosphors when they burn out.
Re:Energy efficiency (Score:5, Informative)
Certainly DLP's don't suffer from burn in (though they have a lot of other issues of course, the infamous rainbow effect being the biggest problem - though things seem to be improving on that front) but the same can't be said for LCD TV's. Although Plasma screens seem to burn in more easily, LCD displays do suffer [apple.com] too [dell.com], however mostly it seems to only be an issue with larger displays (e.g. 30" or larger - the sort of size used in LCD TV's). I am not sure why that is though.
Your backlight may go out, but that's replaceable. Good luck replacing individual phosphors when they burn out.
That's a bit of a red herring to be fair. As with the back lights on an LCD display, Plasma screen will indeed burn out eventually (mine is rated for something like 8 years continuous usage - i.e. so even if I watch 12 hours a day (which obviously I'm not going to) it should be good for 14 years, which I'm comfortable with. Good luck getting either replaced though!
The depressing reality is, unless you have a good 3rd party repair shop in your area that are comfortable with this sort of thing, or you are willing to take your TV apart yourself you are SOL. Vendors like Sony, Phillips (etc.) just don't want to know and that ones that will talk to you invariably give you a price that is equal to or more than the cost of a brand new unit (especially on smaller screens), and of course new sets of better quality will almost certainly be available for 1/4 of the price by then.
Example: I bought a brand new model 32" Sony CRT 8 years ago for 1,500 UKP (the most expensive set in the store as it happened). I'm going to give it to someone in the office who can use a better TV as there is almost no point in trying to sell it - you can get a better set for about 250 UKP now. It has a long-standing problem with powering up from being completely off (it's okay if you leave it on standby, but otherwise you might need to flick it on and off a couple of times), but it would cost about the same as a new set just to get that issue resolved.
Re:Energy efficiency (Score:4, Informative)
FYI, it's more on the order of 100 rotations/sec
The reason the DMD does not suffer burn-in is the fact that the hinges that the mirrors are mounted on do not suffer from the same type of repetitive stress wearout that a larger hinge would, not anything due to the color wheel - top end LCDs and DLPs actually have one light source per primary color
Re:Energy efficiency (Score:5, Informative)
The point was phosphors have a lifespan directly related to their average intensity, and for plasmas it's measurable in a matter of years if not months (for the difference between neighboring pixels).
Memory (Score:5, Informative)
Re:Memory (Score:5, Informative)
Re:Memory (Score:5, Interesting)
I get burn in on my Plasma (a 50") after watching BBC News 24 (which has a large bright red box with the news logo and time on it in one corner) or when leaving my PVR menu on screen for a few minutes or leaving it outputting my Mac Mini desktop for some time (the bright icons in the Dock tend to burn in). As per the manual, if I watch another channel - particularly something bright - it goes away quickly. How quickly it goes away depends how long it was displaying the image (I think that's actually stated in my manual too).
Plasma does seem much more susceptible to "burn in"/persistence than LCD, but for the moment Plasma displays are the only way to go if you are looking for a large set (because you simply can't by very large LCD's). Plasma sets are also typically quite a bit cheaper, which makes them attractive. Lastly, they are also brighter than both back projection displays and LCD displays - my Pioneer Plasma is brighter than my old 1,500 UKP Sony CRT! Plasma sets seem to be the only ones that are able to deliver a bright picture, even with bright direct sunlight bouncing right off them (not a major selling point perhaps, but I was impressed).
I completely expect LCD displays to ultimately take over from Plasma's though. They are (potentially) a fair bit sharper, and they don't generate nearly as much heat - having the Plasma TV on is quite literally like having a radiator on in the room - particularly if it's a bright image, it gets as hot as the bottom of my PowerBook G4. It's just a matter of time before they can be made cost effectively at large sizes with little to no defects. If I was looking for a second (smaller) display I would definitely consider an LCD as it is. That said, I still expect Plasma TV's will be around and selling well for another 5 years yet (not least because it's much better than back projection and it's still kicking around).
I'm not surprised the US is the only real market for large displays. Not only do people have larger houses in the US (than say in Europe or in Asia) - you shouldn't really go bigger than about 42" unless you have a decent sized room -, and have more disposable income (due to lower taxation) but things like electronic goods are just so much cheaper (down to due to a combination of low taxation and economy of scale, I assume).
e.g. The cheapest price for my 50" Pioneer Plasma on Froogle (or indeed anywhere else) in the UK was ~3,500 UKP (with near identical pricing in stores on the continent). It a bit more expensive than most, as it's noticeably above average in terms of picture quality. At current exchange rates, that's over 6600 USD. When searching US stores in Froogle it was not only less than 3,500 US Dollars it was more like 2,000-2,800 (just under 1,500 UKP). Definitely worth a weekend trip to NYC if you are looking for something similarly expensive (but more portable
Re:Energy efficiency (Score:5, Insightful)
Another fine example of money being pissed up the wall in Britain.
Re:Energy efficiency (Score:5, Informative)
They have now been replaced with huge banks of LED displays, similar to those in airports (I believe London KX has done this as well), which are amazingly bright, incredibly readable, and 100x more reliable.
You mean these... (Score:5, Informative)
Why would anyone buy either? (Score:5, Interesting)
I'm not very much of a television watcher, but I do sometimes have friends over to watch movies and such. I recently picked up a projector, and now have a 100ish" display that becomes a blank wall when I'm not using it.
I'm pretty happy with it, projectors are hardly a specialty item any more, and I doubt it was significantly more expensive than a 50" plasma or lcd television. So I'm having a hard time seeing why anyone who wants a big display would ever purchase anything other than a projector.
Is there something here I'm missing?
Re:Why would anyone buy either? (Score:4, Informative)
Re:Why would anyone buy either? (Score:5, Informative)
Re:Why would anyone buy either? (Score:5, Insightful)
There are a number of reasons why people don't want or can't use front projection.
- Not enough room. You need to have a sizeable room for front projection if you really want to get to that 100" size. Being able to project the image is only part of the equation. Optimal viewing distance for a 50" set is between 6 and 10 feet (depending on HD or SD content). Do you really have a room big enough to accomodate a 20ft viewing distance for your 100" image?
- Not enough control over ambient lighting. Front projection needs a relatively dark room, much moreso than a rear-projection TV (CRT, LCoS, DLP, LCD) or direct-view (CRT, LCD, Plasma).
- Wife-acceptance factor. Try telling your wife that she has to make sure the blackout shades are down if she wants to watch her soaps or Oprah in the middle of the day.
- You realize that size isn't everything. Sure, you can get a 100" display, but depending on the technology in your projector you'll likely suffer screen-dooring or pixelization (especially for low-end consumer-grade projectors). 1280x720 (16x9 720p) at 100" diagonal is 14 pixels per inch.
- You realize that the price of the projector isn't everything. For proper viewing, you really need a good screen. A flat, white wall is merely "okay". A flat wall with special paint is better. A proper screen is best. Bear in mind that most people don't have truly flat walls, since drywall is usually somewhat textured. It might look flat, but project an image on it and you've suddenly got a bunch of little bumps causing little shadows all throughout the picture. A screen is really the way to go, and that's not cheap, especially if you want a roll-up model so it hides easily.
When all of the variables are right, front-projection is nice. Getting everything to come together for a proper viewing experience either requires extreme luck or large amounts of money. You can certainly go overboard, like a friend of mine who just put in a $15,000 theater, but even a modest projector + screen + blackout curtains will run you more than the $2000 I spent on a 50" rear-projection DLP.Re:Why would anyone buy either? (Score:5, Informative)
I'm suprised nobody has mentioned lamp life yet. It's a pricy part and has a short life.
2. Video projectors have a very limited bulb life. In other words, if you are watching TV on your video projector about 3-4 hours every night, you would have to replace the light source bulb about once a year at 200-400 dollars a pop.
snipped from
http://hometheater.about.com/od/hometheaterbasics
Re:Why would anyone buy either? (Score:5, Insightful)
> big display would ever purchase anything other than a projector.
Because most people also use their TVs in the DAY or with lights on and projectors are absolutely crap in the daytime. The contrast ratio falls to next to nothing if there's any light in the room whatsoever.
The darkest black a projector can display is the black that you see when you look at a WHITE wall. Look at a nearby white wall NOW and decide for yourself if that's an acceptable BLACK level. If LCDs or Plasmas had a black level that bad, NOBODY would buy them and we'd all still be using CRT screens. The ONLY advantage of a projector is it's picture size, but the vast majority of people aren't prepared to cope with all the drawbacks just to get a bigger (washed out) picture.
Also, projectors are very difficult to site in the average living room. They need to go at the opposite end of the room to all your AV kit and preferably high up on a wall or ceiling. You either have to move all your AV kit to the back of the room and fire your remote controls backwards, or run a signal cable the whole distance of your living room to feed the projector.
They're great if all you want is a big picture in cinema-like blackout conditions, but they're hardly practical for the average family who needs to install it in a room with windows.
Hmm... (Score:5, Funny)
Also, they should put racing stripes on them.
Power consumption! (Score:4, Informative)
LCD power consumption GOOD
Can't stand LCD (Score:4, Interesting)
I just bought a 42" HDTV capable plasma, and had to turn the sharpness down to 50%, as otherwise all non-HDTV contents, including DVD's looked extremely blocky and I could see the MPEG artifacts everywhere - the default image was far too clear. I shudder at the thought of how horrendous it would have looked on an LCD screen, as I usually notice the pixelation far easier on LCD screens than I do on plasmas.
Maybe I'll consider an LCD screen when I'm using all HD content, or if they start supporting adaptively blurring lower resolution content sufficiently.
Sharp images only works for me when the DPI of the source is high enough that you can't see individual pixels at normal viewing distances.
Yes, I realize that means that I've on purpose chosen a screen with a "lower" picture quality, but the end result is far better with 90%+ of the content available to me. And it was cheap enough to replace in a couple of years if a usable LCD screen (or other tech) comes along.
Article in IEEE Spectrum (Score:5, Informative)
Their take on it? It won't be settled for another couple of years, and there will be two distinct categories: screens below 50" (or 42"), and screens larger. LCD will dominate the smaller screen size market, though SED may replace that when the cost comes down (after 2010?). For larger screens, don't discount projection technology, particularly in terms of cost.
Incidentally, the cover article [ieee.org] for this issue is on Blake Ross [wikipedia.org], whom they call the Firefox Kid.
Re:SED anyone? (Score:5, Informative)
Re:SED anyone? (Score:5, Funny)
SED:
[TMRC, from Light-Emitting Diode] Smoke-emitting diode. A friode that lost the war. See also LER. [Not to be confused with sed(1), the Unix stream editor. ESR]
http://catb.org/jargon/html/S/SED.html [catb.org]
--
BMO
Because DLP has inherent limitations LCD doesn't (Score:5, Informative)
1. It is inherently a projector technology, which means:
a. For a front projection situation, DLP image quality is directly dependent upon the illumination within the room and the screen.
b. For a rear projection situation (i.e. the one that looks like a stand-alone TV), DLP requires a screen that has inherently poor viewing angles, particularly when viewed above or below the vertical screen limits. Even older LCDs without the "180 degree" viewing angle are far better than any DLP RPTV screen.
2. It is a technology dependent upon light sources that (currently) have inherently poor lifetimes. Lamps are expensive replacements. When LEDs and lasers come more into the fold, this should alleviate this problem.
(Note: this could also be construed as an advantage since you'd have all new luminance and you can't replace the CCFL backlight in an LCD which has a tendency to degrade unevenly over time).
3. It is a technology that, unless you use three separate DLP chips for the primary colors, will be prone to rainbow effects. Even in the 3DLP setups, convergence can also become an issue.
DLP is good for certain applications but will never be the primary volume driver of the market. Two years ago, it was the only way to get a decent screen size for HD, but not any more. The whole industry has dogpiled onto LCD direct-view, and it'll only get cheaper from here.