Monitor Basics - LCD vs. CRT 521
Herbal V wrote in with a little article discussing the differences between LCD and CRT. Briefly summarizes all the major issues (Price, Refresh Rate etc). More of a beginner level piece, but as LCD prices are dropping like rocks, it's good to be aware.
Nothing for you to see here. Please move along. (Score:5, Funny)
Typical, a story about monitors comes along, and mine decides to censor it.
Geek news??? (Score:2)
Re:Geek news??? (Score:5, Insightful)
Presenting facts and information to the layman can be a difficult task, and its good for us to see how its done.
Instead of us all saying something like "let me try try to explain it" to a family member or friend, you can direct them to an article written with them in mind, and with enough information to answer most of their queries.
Full article before their servers crash (Score:3, Informative)
As the technology has improved and the prices have come down, LCD (Liquid Crystal Display) monitors have rapidly been replacing CRT (Cathode Ray Tube) monitors on desktops around the world. ComputerWorld first reported that LCD sales would surpass CRT sales for the first time in 2003, a lead that it didn't hold for good. But according to DisplaySearch, a flat panel display market research and consulting company, the sales of LCD monitors regained the lead over CRT sales in the third quarter of 2004,a lead that it should eventually hold for good.
The question is why choose LCD over CRT? There are several pros and cons to consider, and a few items will be considered in this Tech Tip, such as: Price, Size, Image Quality, Energy Consumption, Personal Comfort, and Response Time.
Price
The price of LCD monitors is much lower than a few years (or even months) ago, but still far exceeds the price of a comparable CRT monitor. For example, I spent about $600 (US) on a Viewsonic VA-720 17" LCD monitor in early 2003, and see that the same model now sells for less than $300. A significant price drop, but in comparison a 17" Viewsonic CRT monitor can currently be purchased for less than $100. The ratio of prices may have narrowed from about 5:1 to 3:1, but the aging technology behind CRTs still allows it to hold the lead.
You can't even compare prices of CRTs to LCDs in ComputerGeeks.com's monitor section as they are right in step with the sales information provided above, and now only carry LCD monitors. Prices vary, even among LCD monitors of the same screen size, so there has to be something more to it than price.
Size
One reason that LCDs have gained in popularity is because of their small foot print. The overall size and weight of CRT monitors far exceeds that of LCD monitors. CRTs share the same image processing technology with tube televisions, and therefore share the same bulky style of housing. For example, the manufacturer's web page lists this ACER 19" LCD monitor as having a depth of a mere 6.9" (including the base) and a weight of 12.1 pounds. As a point of reference, a 19" ACER CRT is significantly larger with a depth of 16.86" and a hefty weight of 46.31 pounds.
Desktop real estate is precious, and an LCD will require only a small fraction of the depth that a CRT would require. And if there isn't even enough room on your desk for a slim LCD monitor, the low weight makes them perfectly adaptable to be hung on the wall, or off of a radial arm mount, such as this one from Office Innovations.
Image Quality
Image quality is generally considered to be better on an LCD, as each pixel is generated by a specific set of transistors in the screen, which produces a crisp image. But some features that fall under the general heading of image quality might not favor an LCD, including viewing angle, brightness, and contrast.
Early LCD monitors had a fairly narrow viewing angle that made clearly seeing the screen from anywhere but directly in front of it difficult. This has improved greatly, but still doesn't quite rival the viewing angle of CRTs which provide the same picture quality regardless of the angle. A monitor with a maximum vertical viewing angle of 120 degrees should not be hard to find at this point, with many monitors now being able to provide an even greater angle.
Brightness is an area that LCD monitors may have the edge over CRTs, but it varies widely from unit to unit. The standard measure for brightness is referred to as "nits", which have units of cd/m2 (candelas per square meter), where a higher number is better. Looking at three of the 17" LCD monitors currently available from ComputerGeeks.com as examples shows two with brightness specifications of 400 cd/m2 and one with a brightness specification of 250 cd/m2. As a comparison, the typical CRT monitor may provide half the brightness of an LCD, as confirmed at Viewsonic's Monitor University.
Contrast is similar to brightness in the fact that
Don't forget ClearType on your LCD (Score:5, Interesting)
ClearType takes advantage of the fact that LCDs make coloured pixels out of three adjacent sub-pixels (usually R-G-B), rather than a CRT which focuses all three of its guns on the same spot. By varying the intensity of the three colours in each pixel, ClearType effectively triples the horizontal resolution of type. The trade-off is some slight colour-banding in small fonts, but the payoff is a much more readable screen.
I stumbled across the settings by accident. With the increasing popularity of LCDs, I'm surprised that Microsoft doesn't promote it more.
Re:Don't forget ClearType on your LCD (Score:5, Informative)
Re:Don't forget ClearType on your LCD (Score:4, Interesting)
Re:Don't forget ClearType on your LCD (Score:2)
Re:Don't forget ClearType on your LCD (Score:3, Informative)
This was a beginner's article, but the author probably should have mentioned these other caveats with LCDs:
Native resolution issue mentioned above.
Dead pixels. Unless
Re:Bitching the LCDs, continued (Score:3, Interesting)
Re:Don't forget ClearType on your LCD (Score:2)
Re:Don't forget ClearType on your LCD (Score:2)
That said, it is a trifle burry on my old laptop. It looks fantastic on both my new laptop and my separate 19in LCD.
Re:Don't forget ClearType on your LCD (Score:4, Informative)
Re:Don't forget ClearType on your LCD (Score:3, Funny)
Wow... who came up with that name? I'll give it a shot.
Re:Don't forget ClearType on your LCD (Score:3, Funny)
There's the 'really blurry with multi-coloured edges' setting, the 'really blurry with big thick fonts' setting, etc.
but no 'non-blurry' setting, other than switching it off.
Re:Don't forget ClearType on your LCD (Score:2)
Re:Don't forget ClearType on your LCD (Score:2, Informative)
Re:Don't forget ClearType on your LCD (Score:2)
Re:Don't forget ClearType on your LCD (Score:5, Informative)
Re:Don't forget ClearType on your LCD (Score:3, Informative)
In a CRT monitor, an individual pixel is made up as a triangle with RGB on each corner.
However, on an LCD, the individual color elements are arranged in horizontal strips
rgbrgbrgbrgb
rgbrgbrgbrgb
rgbrgbrgbrgb
rgbrg b rgbrgb
rgbrgbrgbrgb
On a CRT monitor, a dot is basically a dot.
On an LCD, its a strip.
Cleartype works by performing antialiasing on these elements, but "borrowing" adjacent color elements.
Comment removed (Score:4, Informative)
Re:Don't forget ClearType on your LCD (Score:3, Funny)
That's where you lost me. ( ;
Re:Don't forget ClearType on your LCD (Score:5, Informative)
Re:Full article before their servers crash (Score:5, Informative)
What this article does not talk about is color gamut. CRTs are able to display a much wider range of color compared to LCDs. Any application where color is important (desktop publishing, graphics work, etc.) will want to use a CRT for the forseeable future. On this LCD, whites are not really white, blacks are not really black.
That said, the LCD display really does very well in two areas: 1) lack of refresh rate, even at 60Hz things are nice and solid. 2) lack of convergence artifacts. Because each pixel has seperate addressable color components, you don't have to worry about gun convergence like CRTs. Individual pixels are nice and sharp. On lower priced CRTs (particularly OEM ones) convergence is often never quite right. If the convergnce is adjusted properly for one area of the screen, it will be off in another. Buying a higher priced CRT will end up with better results, but be sure it is always transported in its original packaging, or else the convergence can get shot to hell.
Both CRTs and LCDs have their probelms and benefits, and the choice between them depends on what your application is. For my purposes, I think I will end up going with a CRT and LCD dual-display system. I'll see how that goes.
-molo
Re:Full article before their servers crash (Score:3, Insightful)
Buy and use a calibration sensor and calibration software. It can really help. (Note, I code this stuff for a living these days.)
Re:Full article before their servers crash (Score:2)
Programming (unless they are misaligned) and working in emacs
CRT's:
Web development, if you hike it to 100hz, the colours are beautiful and you can work nicely without the visible partitioning between pixels.
My machine: the graphics card is loose, so it is like working in a disco, the screen is flickering, but this is my home machine, so I use it 5 mins a day.
I would (and have) bought a new CRT over plasma/lcd or rear proj DLP.
(unless you put your lcd flat against wall (which isnt a
Website go boom! (Score:5, Funny)
Anybody else see the irony in this?
Re:Website go boom! (Score:3, Funny)
Uhm. Not really, no.
~Lake
2 Years On, On LCD (Score:4, Interesting)
Thing even came with a wall mount, too bad I live in an apartment (though toothpaste does have its other uses...)
Size is great, too, because a 17" LCD is almost as big as a 19" CRT :-)
Re:2 Years On, On LCD (Score:2, Funny)
Re:2 Years On, On LCD (Score:2)
Re:2 Years On, On LCD (Score:3, Funny)
What's "nefaworking"?
Worst (Score:3, Funny)
Worst analogy. Ever.
Re:Worst (Score:2)
I still prefer my Sony 19" trinitron for games. And a sony 19" lcd at work which I like.
I actually don't like most LCD's. I find most in the market work best at only one or two resolutions. And a lot of them aren't half as easy to look at as, say a cheap ViewSonic 19".
Re:Worst (Score:2)
Like Rocks (Score:2)
Just a mundane effort in the bad analogy business (Score:2)
How about saying, of a piece of software, that it has "surprising equipment" -- just like that character in the crying game? [petting-zoo.net] Now you're talkin' bad analogies.
I also love it when I hear "out of the box." Because, you know, just using the dang analogy is a completely trite thing by now -- it's the hackneyed way of thinking inside the dang box, and has been since sometime in the 1980s when Deming really caught on in MBA jargon. The analogy that means exactly the opposite thing, yeah? That's got to rank.
CRT Trash Problem (Score:2, Interesting)
Re:CRT Trash Problem (Score:3, Informative)
^^ That's what we do. I used to give Goodwill the w
When I was a kid (Score:4, Funny)
Out the window, then drop a mallet on it (literally, out the same window), repeatedly, until the screen with the metal frame around it is the only part remaining, and the rest is pulverized. The screen will be the only part remaining, because it's a half-inch thick glass, as opposed to the wimpy glass in the back part of the tube, and the cheap plastic that the rest of the thing is made out of. Then take the screen, line it with a doormat, and ride it off snowy hill. Glass has a really small friction coefficient against snow.
Don't try this at home:-)
Re:CRT Trash Problem (Score:2)
Hello (Score:2, Funny)
Sincerly,
Thomas Edison
What drops? (Score:3, Interesting)
With all the news of companies dropping plasma, more LCD plants being opened, production being increased, technology improving, why hasn't the price of LCD monitors been cut in half?
I think it's because it has the cool factor that lets the companies sell it at whatever price they want.
Look at the quality of LCDs in some laptop and how cheap they are. OFten times a comparable LCD for a Pc would be more expensive than he laptop WITH the lcd.
Re:What drops? (Score:3, Interesting)
The price for craptacular 1280x1024 displays has been dropping, but if you actually want to use those 19 inches of screen real estate with, say, a higher resolution (say, 1600x1280) you're still looking at just under a grand. Which is absurd. Most good CRT's go up to 2048x1536, and can down-res when needed (higher framerates for games, for instance), yet cost half that.
Re:What drops? (Score:2)
But then, sizes have also increased to compensate for those price drops. A 21" LCD is now $700. In 1995 a 17" CRT was $700.
Re:What drops? (Score:2)
Re:What drops? (Score:5, Informative)
Response time (Score:5, Interesting)
Re:Response time (Score:4, Informative)
Re:Response time (Score:2, Informative)
TomsHardware (don't pretend you need a link) have been plotting response-time against brightness change in their reviews recently, showing the advertised 14ms (or whatever) on the black-white transition, and response times increasing for changes of greyscale (with a peak somewhere around the 25% brightness change of maybe 30ms for a "14ms" monitor)
Comments on aria also mention that images seem to linger longer when there is blue invo
Good pixel response == great gaming on LCDs (Score:4, Informative)
Don't give up, give a quality LCD a try first and you may never go back.
Response time is a critical feature for me. I won't buy any LCD screen unless it's in the 16ms-or-better range for typical pixel response.
My NEC LCD1760NX is great for games and movies. No hint of ghosting at all. Solid, bright, good footprint too. Digital/Analog connections as well.
LCDs still have problems with color correction for serious graphics work, or so I'm told. But you couldn't pay me to get in front of a CRT anymore. My eyes won't take it.
Re:Response time (Score:3, Informative)
A response time of 40ms means it takes a pixel 40 milliseconds to change color. At that rate, it can change 1/.040 times per second, or 25 frames/sec if new images are perfectly in sync (and they never are). That's slow enough that most people will notice rapidly changing images bleed into one another as the pixel is given a new value more rapidly than it can change. Thus a 40ms LCD is a poor choice
horizontal or vertical frequencies? (Score:2)
Re:horizontal or vertical frequencies? (Score:2)
Re:horizontal or vertical frequencies? (Score:4, Funny)
I hate you.
Re:horizontal or vertical frequencies? (Score:3, Informative)
Re:horizontal or vertical frequencies? (Score:2, Informative)
The biggest advantages (Score:2)
Re:The biggest advantages (Score:2)
Given enough time maybe I'll see more LCD screens fail. Under normal conditions though I don't think I've seen any LCD have issues other than every once in a while you'll have a dead pixel out of the box.
Health Issues (Score:5, Interesting)
Re:Health Issues (Score:5, Interesting)
After a while, I would just fall asleep at random points because of sleep deprivation, missing classes and all. When I finally went to a sleep doctor, I learned it could be from the refresh of my CRT. I then moved to an LCD and haven't had that problem. I can now sleep 10 minutes after getting of the computer where as before I would need to wait 90 minutes for my brain to wind down.
Re:Health Issues (Score:2)
I've been having incredible trouble sleeping for about a year, and now I remember that is was just about a year ago that I bought a new 20" CRT so that I could run at a higher resolution for, believe it or not, programming. I ran into the whole 30-40 hour day problem last semester and my GPA's still bugging me about it... I'll try using my laptop more.
Thanks again
Re:Health Issues (Score:2)
I switched everyone in the company to LCD's, and people that had problems with headaches (accountant, ISO Quality Control) all got 19" TFT's. The headaches went away almost immediately, and haven't returned.
Re:Health Issues (Score:2)
Re:Health Issues (Score:5, Insightful)
I'm not trying to troll here, but maybe... just maybe.... those health issues aren't from sitting around in front of 5 CRTs necessarily, but maybe years of just sitting around, period.
Exercise improves your health and your appetite.
Too Cool for School (Score:5, Funny)
Save you energy, health, and space! (Score:5, Informative)
Energy Consumption
LCD monitors definitely hold the edge over CRT monitors when it comes to being energy efficient. The huge tube in a CRT monitor is the source of most of its energy consumption, and a comparably sized LCD may use just a fraction of the electricity. Taking a look at this 19" Jetway LCD monitor shows that it consumes 48 Watts during normal operation, which is less than your typical light bulb. In contrast, a 19" CRT such as this one from Viewsonic may draw up to 160 Watts. Therefore the fraction of electricity used in this case is 3/10, and could translate to noticeable savings on your electric bill.
I currently have two 17" CRT monitors on my L-shaped desk. One is a newer model "flat screen" and the other was a freebie HP branded CRT. I know that they are sucking power and sending that power back out as radiation directly into the side and front of my face (as they are surrounding two of the three sides of my head). I have switched to a lot of energy saving bulbs in my house and I plan to switch more as the bulbs die off. I have switched to a programmable thermostat (that isn't 5 degrees off like the one that the original owners had) to save electricity/gas during the day and evenings. Why not my computer crap too?
I have even gone so far as to make sure that if I am not going to be home for more than 24 hours my non-essential computer equipment is off. A few bucks here and there equals beer later.
Personal Health and Comfort
The main benefit that LCDs have when it comes to comfort is the reduced strain on your eyes. The reduced glare on the screen's surface, and the elimination of a typical CRT's "refresh", can prevent your eyes from getting tired from extended use. A CRT monitor redraws the image on the entire screen as it refreshes, whereas an LCD monitor only changes the necessary pixels during a refresh.
There may also be the unquantifiable effect of reduced electromagnetic emissions on LCD monitors. The exact impact of electromagnetic emissions may not be fully understood, but in general less is considered to better, as addressed in this article. And, your back may also appreciate an LCD when it comes time to move, as the example above shows a 19" LCD monitor weighs about ¼ as much as its CRT counterpart.
What I have noticed is that using both at work (and now both at home) that I have significantly MORE eyestrain. Moving back and forth between the two seems more harmful than just sticking with one or the other. Sadly I am going to be in this situation at home for a while yet but at work I have only this 20" CRT to replace. The 23" LCD is in IT and waiting for install so it won't be too long. I was QUITE surprised when I went to pick up the 17" LCD at the FedEx hub that it fit easily in my trunk and was light enough for me to hold with one arm safely. I can't say that much about lugging my 17" CRTs around. Woo for that.
My other reason for loving LCDs is desk real estate. With my CRTs tons of desk space is lost to their screen, their rear ends, and their bases. With the new LCDs I have quite a bit more room to stack cans, plates, etc. It also makes me feel more "free" to move around in the tight space that my computer area is located.
I look forward to my second LCD at home and the savings in health, energy, and space it will give me.
Re:Save you energy, health, and space! (Score:4, Funny)
If I send you my e-mail address, can you send me your picture? I've never run across anyone with a triangular head before.
Re:Save you energy, health, and space! (Score:3, Funny)
I'd like to thank you for requesting this 23 inch LCD monitor. We have 6 months of Quality Assurance testing to ensure that it is compatible with our highly specialized Dell Computer Terminals.
Sincerely,
IT.
Sum it all up! (Score:2)
Re:Sum it all up! (Score:2)
What? (Score:2)
LCD refresh, pricing (Score:2)
Does anyone have recommendations for lower-end LCDs? I just bought a 17-inch LCD from Dell for my girlfriend for $300 (on sale from $350), and it seems pretty good.
Are prices going to continue to drop? I know people predicted they would hold steady for most of 2004--are the supply problems fixed?
Re:LCD refresh, pricing (Score:2)
Re:LCD refresh, pricing (Score:2)
Re:LCD refresh, pricing (Score:3, Informative)
LCD refresh rates won't "improve", so you can stop worrying about that.
The reason that they won't improve is that 60Hz refresh is plenty enough for an LCD monitor, even with fast motion video on it. The CRTs need a faster refresh rate because they flicker, i.e. each pixel's brightness gradually falls off from refresh to refresh. LCDs don't flicker, i.e. a pixel stays at the same exact brigh
Re:LCD refresh, pricing (Score:2)
CRT only please.. (Score:2)
Yeah, they're BIG, heavy, hot, power suckers, etc.. But, there is no way possible an LCD display can rival them, not no way, not no how.
LCD is for neophytes that want to be trendy.
In some cases they are called for, like space restricted areas or where you need a lot of them up at the same time, etc..
But, if you spend serious time (14-18 hours a day) looking at screens, you need top of the line CRT's. CAD, DTP, video production, etc..
Even hard core gam
Re:CRT only please.. (Score:2)
It's easy. (Score:5, Funny)
Buy a CRT.
Spend the rest on booze and hookers.
Do you have limited space and/or need to move around.
Buy a LCD.
Pay for booze and hookers with a credit card.
Instead of a summary.... (Score:5, Informative)
X-bit's Guide: Contemporary LCD Monitor Parameters and Characteristics [xbitlabs.com]
It weighs in at 27 pages, but if you really want to know what you're talking about when discussing LCDs, it's required reading.
Some of mine (Score:3, Informative)
Reasons I haven't switched to using LCD displays (Score:3, Insightful)
* Price: A 19" High Quality CRT w/ 18" viewable area, is hundreds of dollars cheaper than a high quality 17" LCD (with the ultra low response time, excellent colour, etc.)
* Sucky low resolution support: I maintain a Linux port of an adventure game system that runs at resolutions including: 320x200, 320x240, 640x400, 640x480, 800x600. Every LCD i've ever seen has one of two sucky ways of dealing with low resolutions: Stretch the image to fit, blurring the heck out of it, or displaying it at near postage stamp size.
Show me an LCD that solves both problems and I'll run to buy it in the very near future.
Mirror (Score:2)
Probably the same reason... (Score:3, Funny)
my wife's more popular than me.
just kidding...!wife.
Still a mixed market (Score:2)
Anyway, I'm not a heavy gamer, but I do play some, so I don't want a ghosting monitor, which means I need a high-speed panel. Also, I'm very used to my huge screen real estate, so
Brightness & Contrast Ratio (Score:2)
I don't have numbers to back it up, but every CRT I have seen has been remarkably brighter than most LCD's. The only LCD's I have seen that could match a CRT are some of the new Sony's that are almost too bright.
Contrast Ratio:
The article mentioned something about CRT's only having a contrast ratio of 700:1. I was reading last week, and came across something that pegged a CRT's contrast ratio in the thousands to one, not hundreds to one.
Those are my biggest gripes about this article, but
Fluffy comparison (Score:3, Interesting)
CRTs certainly win out when it comes to contrast, yet the article only begrudgingly says that CRTs "may still have the edge". "May"? They absolutely do rule for contrast. When the electron gun turns off on a CRT the screen is black. On an LCD it's dark gray.
I believe CRTs also win for refresh/framerate. The 'reviewer' relies on manufacturer specs to evaluate transition times. Are these the same manufacturers who used to tell us that their 15" monitors were 17"? Or the same ones who would use inappropriate contrast tests in order to claim huge ratios? It's true that LCDs don't flicker, but a fast refresh CRT doesn't flicker either and the CRT can switch images very quickly. The best LCDs that I've seen are still inferior in this regard. I'd prefer to see independent testing to validate these claims of 16ms switching times.
Again, I love my LCDs and wouldn't trade them even though Doom III does smear a bit when I pan around. I love the low power consumption and I love the ease on my eyes, but it still doesn't change the fact that this article is just some fanboy fluff piece.
did he compare the actual area?? (Score:2)
Low resolutions, poor quality control (Score:2, Insightful)
More importantly, the higher resolution monitors are still not available. As I type this on my 1920x1440 screen, I wonder why I would be motivated to pay a high premium for no more than 1280x1024 resolution. I do have one LCD panel that I like, it's only 1024x768, but it's mounted on my keyboard rack, and serves a specific purpose where low resolution is not a problem.
But everywhere else, virtual desktop real estate is much more important than physical desktop
Re:Low resolutions, poor quality control (Score:2)
Of course, if you really want your CRT for the "she
Re:Low resolutions, poor quality control (Score:2)
20" seems to be much more 'spensive than 19" (Score:2)
I'm sure that people will scoff at me for "requiring" 1600x1200, but once you get used to it, 1280x1024 seems cramped.
Would make for a good CDM (Score:2)
It misses one important point (Score:2)
A 18" lcd is comparable to a 19-20" crt, depending on model.
So what this means is this guy is comparing different size monitors...so the price difference is actually somewhat less.
But wait, it's about to get interesting... (Score:2)
This summer the "Thin CRT's" are being released. It's pure CRT technology and only going to be slightly thicker than an LCD of today.
The initial asking price is going to be just slightly above the price for the same size LCD, but the price is expected to plummet since CRT technology is so proven and cheap to manufacture.
I am waiting to buy anything, because I'd much prefer CRT crisp and sharpness vs an LCD's.
Deja Vu (Score:2)
Color issues (Score:2)
Re:Perhaps next week we could do black vs white (Score:2)
Re:this article would be more appropriate... (Score:2, Insightful)
The article barely touches on the response time inadequecies of LCDs. It even goes so far as saying that LCDs have a better picture than CRTs, when anyone who uses their computer for visual design knows the color problems with LCDs.
Come on here, just because you get a nice radiation bath with CRTs is no reason to hate on them and deny the areas that they excel over LCDs: color, darks/lights, any moving picture, etc...An