The Technology War: LCD vs. DLP

Evan Powell, July 28, 2009

Introduction

If you are new to the world of digital projectors, you won't have to shop around long before discovering that the terms LCD and DLP refer to two different kinds of projectors. They are in fact two different kinds of microdisplay imaging technology. You might not even know what LCD and DLP are before asking the obvious question "which one is better?"

The answer is simple--neither one is better than the other. They both have advantages over the other, and they both have limitations. Both technologies are much better than they used to be. The purpose of this article is to discuss how they differ today, so you can determine whether the imaging technology itself is a relevant factor in your choice of a projector.

It is important to note there is a third significant light engine technology called LCoS (liquid crystal on silicon). It is developed and marketed by several vendors, most notably Canon, JVC, and Sony. Many excellent projectors have been made with LCoS technology, including several outstanding home theater projectors that can, in the opinion of many observers, surpass the value proposition of both LCD and DLP offerings. The discussion of LCoS technology is beyond the scope of this article, and will be addressed separately in an upcoming article.

Is it 3LCD or LCD?

You may have already seen the term 3LCD on websites and in projector literature and press releases. Several makers of LCD projectors have adopted 3LCD as a marketing brand name. It is intended to distinguish the specific implementation of LCD technology found in digital projectors from the more common direct view LCD displays found in a wide variety of consumer products. In LCD projectors there are always three LCD panels, and they are always light transmissive devices rather than reflective or direct view displays. Within the projector industry, there is no technical difference between 3LCD and LCD, and the terms can be used interchangeably.

Which Technology Leads the Market?

Well, the answer to this question depends on your definition of the word "lead." As of this writing, DLP technology has a significant lead in terms of the number of models currently in production. As of this date, July 28, 2009, our database lists 704 different DLP-based models in production, as compared to 430 LCD models. Thus, DLP holds a commanding lead in the number and variety of models being produced.

However, this is not the whole story. Many of the best selling projectors these days are LCD models. As an example, at the moment, six of the Top 10 Most Popular 1080p home theater projectors on this site are LCD's, two are DLP and two are LCoS. In fact, despite the clear advantage DLP has in the number of models in production, Pacific Media Associates reports that LCD projectors held a 51% market share by unit volume in 2008. Clearly both technologies have a huge market presence, and neither one is about to emerge as the dominant player.

The Technical Differences between 3LCD and DLP

LCD (liquid crystal display) projectors contain three separate LCD glass panels, one each for the red, green, and blue components of the video signal. Each LCD panel contains thousands (or millions) of liquid crystals that can be aligned in either open, closed, or partially closed positions to allow light to pass through. Each liquid crystal behaves in essence like a shutter or blind, and each represents a single pixel ("picture element"). As red, green, and blue light passes through the respective LCD panels, the liquid crystals open and close based on how much of each color is needed for that pixel at that moment in time. This activity modulates the light and produces the image that is projected onto the screen.

DLP ("Digital Light Processing") is a proprietary technology developed by Texas Instruments. It works quite differently than LCD. Instead of having glass panels through which light is passed, the DLP chip is a reflective surface made up of thousands (or millions) of tiny mirrors. Each mirror represents a single pixel.

In a DLP projector, light from the projector's lamp is directed onto the surface of the DLP chip. The mirrors tilt back and forth, directing light either into the lens path to turn the pixel on, or away from the lens path to turn it off.

In the most expensive DLP projectors, there are three separate DLP chips, one each for the red, green, and blue channels. However, in most DLP projectors under $10,000 there is only one chip. To define color, a color wheel is used that contains (at minimum) a red, green, and blue filter. This wheel spins in the light path between the lamp and the DLP chip and alternates the color of the light hitting the chip from red to green to blue. The mirrors tilt away from or into the lens path based upon how much of each color is required for each pixel at any given moment in time. This activity modulates the light and produces the image that is projected onto the screen.

(Note: In addition to red, green, and blue filters, most color wheels contain other segments as well. A "white" or clear filter used to boost brightness is common in business/commercial projectors, and many color wheels have filters for colors other than the primaries, such as dark green, cyan, magenta, or yellow.)

Contents: Introduction DLP Advantages DLP Limitations LCD Advantages and Limitations
 

Reader Comments(57 comments)

Posted Nov 21, 2014 10:20:22 AM

By reiNbow

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Hmm, to expect a product lifetime of 100 000 hours is over the top I think. It would be equivalent of watching movies for 8 hours per day, every day for 35 years.

Posted Mar 18, 2014 6:00:46 AM

By WMAKA STEVE

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hi......... i have installed and worked on LCD projectors since 2008.but i would recommend buying dlp since its the in -new thing . lcd suffers the chicken like effect of door light

Posted Nov 30, 2013 8:36:13 PM

By B Rivers

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Having designed, installed and serviced projection systems in corporate, museum and other environments for 20 years, it is my experience that LCD panel degradation is a serious concern that should be considered in any application where projectors run for more than a couple hours at a time. The high heat and intense UV output of projection lamps causes LCD panels to breakdown, especially in high brightness models, and the effects of this can be quite severe, typically burning up the blue panel first. I think it is an understatement to represent this merely as "a color shift", as the result is seen as a large black hole in a blue image, or a large yellow area in the center of a white screen. I've discussed this with engineers at many projector manufacturers who make both LCD and DLP products, who've confirmed that all LCD projectors, even those with inorganic elements, are subject to this degradation, and therefore are not recommended for applications where the projectors will be used for long periods of time. Inorganic versions do last a bit longer but still suffer from the same problem. The cost of servicing a projector with a burnt up LCD panel can be quite high, I've seen repair costs of $1500 or more for replacing the panel in a 3500 lumen conference room projector, not including the cost of shipping the unit back to the manufacturer/service center. Anyway, my advice and general rule of thumb is LCD is fine for applications that will see sporadic use for short periods of time, but for critical environments and applications where projectors need to run for extended periods of time, I strongly recommend DLP. There are of course exceptions to every rule, and for those who are amongst the small percentage of viewers able to perceive the rainbow effect of single chip DLP, find it problematic and understand the potential accelerated need to replace/service LCD projectors and can afford to do so, they may choose to go with LCD, but make sure you understand the considerations.

One final note: The potential color saturation advantages noted for LCD models only apply in comparison to single chip DLP models. Professional three-chip DLP projectors provide the most accurate color reproduction, which is why digital cinemas and high end staging companies use them almost exclusively. (One exception: Christie Digital has recently shown a prototype 4K laser projector for very large digital cinemas, not to be confused with small, low cost LED/laser hybrid projectors) These are truly professional grade models, and are not available in low cost versions, three-chip DLP projectors start at $20K+, ranging up into the stratosphere for extremely high brightness (flamethrower) models that can drive enormous screens, but for critical applications and large venues are the tools that can really get the job done.

Posted Dec 23, 2012 10:39:40 AM

By Jackey Wordstooln

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I didn't know LCD means liquid crystal display until I've read this post. Thanks so much for educating me. My Last Post: <a href="http://marketbold.com/KeywordMapPro/">Google Wonderwheel</a>

Posted Sep 7, 2012 7:16:40 AM

By Anthony

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I own a Sony 3LCD VPL-AW15 and it has been used sparingly over the course of almost 4 years for about 900 hours on its original bulb. I really like the natural tone of the colors and the contrast compared to other projectors, although it could use a little more brightness. Relatively recently though, I purchased from ebay a Sony VPL-VW50 SRXD projector in mint condition with a replaced compatible bulb with barely 180 hours on it. Obviously, the picture looks much sharper on the VW50 because it is a full HD projector but I think the colors look a little bit better on the lower end Sony. Obviously, it could be just a matter of calibration. One thing I really enjoy about the VW50 is the motor assisted lens shift and focus, it just much cooler than dialing it in with the nobs on my other projectors. I received yesterday a new LG PA70G from fry's and I'm experiencing the focus uniformity issue prevalent with this new model but I'm going to have to live with it. I love how small and light the LG is and that at least now I can dispense with the bulb life anxiety. I don't have a lot of experience with DLP projectors except a really crappy 800x600 res projector we use at work for presentations. I wouldn't mind trying a quality DLP projector first hand to see the difference in person. So far, I'm pretty satisfied with my LCD projectors, especially for the price I've paid for them ($1000 for the new one with an 80" screen included, $600 for the used Sony and $460 for the LG)

Posted Aug 13, 2012 2:56:02 AM

By stolennomenclature

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The comment in the article re LCD projectors lasting 4000-10000 hours before the onset of lcd panel degradation is disconcerting. Not just because the figures seem to me to be so very low, but also because the author seems to be quite happy with these very low figures. 4000 hours is about the same lifespan as the average bulb, and 10000 hours only just slightly more then the lifespan of two bulbs. In the 4000 hour projector you would never even get to change the bulb, having to change the projector at the same time. In this case the manufacturer might just as well solder the bulb in. The longer lived projector would only get part way through its third bulb before you would want to chuck it. To me this situation is quite absurd. I would expect to get much more life out of a product costing this kind of money. To me the absolute minimum would be 60,000 hours for a cheap one, and say 100,000 or more for a top of the range one.

Posted May 10, 2012 11:17:42 AM

By Chris

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I had the same problem. This product has a 3 year warranty. They fixed it for me. 8 Month later I had the same problem again and I was out of warranty. If you are still in the 3 year window call them and get it fixed.

- Chris -

Posted Dec 6, 2011 3:48:14 PM

By Jorge

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Bought a Viewsonic PJ551D (DLP) for 600 Euros and after 2000 lamp hours (2 1/2 years) black and white pixels started appearing on the screen. At the beginning only a few, after a few weeks half of the screen was covered with damaged pixels. Such a product should last more than this. Should have gone to the movies...

Posted Nov 28, 2011 10:42:06 AM

By VAN

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The one real disadvantage LCD not mentioned is the picture breakup(pixelation/motion lag)if there is motion in the picture. Its still quite noticeable on top of the line 240 hz refresh TVs. And I would assume on projectors too. To me at least it gives me a weak knee feeling almost like standing in a small boat. I get a light headed almost sea sick feeling while standing if I look at a display for more than a few moments. I haven't tried watching sitting down as I only have watched them in stores while standing. Note: I do own a DLP projector and the picture quality is vastly superior to LCD TVs with a lot of motion in the picture.

Posted Jul 25, 2011 8:25:06 AM

By abhinav

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The article helped me a lot, i want a good HD projector under 700$ any suggestion ..

Posted Mar 3, 2011 10:26:21 AM

By lynn

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I would like a projector for under $500 to watch dvd's in my back yard. Any suggestions. thanks!

Posted Feb 21, 2011 10:17:45 PM

By heidi

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Is there less than a kilo projector? Which technology is cheaper over time?

Posted Dec 28, 2010 5:20:51 AM

By David Holloway

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Have had a DLP Optoma HD65(720)projector for approx. two years and have been very impressed with it. Initially, I was a little apprehensive that such a small unit could give out such an amazing image and with such quality (I grew up with film both in cine and slide with all its problems of dust, hairs in the gates, camera & projector, and most importantly light output; the one advantage it seems to me was the quality of lenses and focal lengths). This article has provided me with a greater knowledge of both systems and as I now wish to upgrade, a help in making a decision between DLP & LCD. I say 'help' but not a firm decision as although in favour of DLP I find the lack of optic flexibilty a drawback in projector placement; in fact there seems to be a distinct lack of info in respect of the optical specification in all models, unlike film projectors. The comment by Thomas on this aspect I concur with and ask the same question.

Posted Oct 16, 2010 3:50:08 AM

By David Berry

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Isn't it time to update this article to reflect the availability of LED illuminators for DLP projectors? The advantages of LED illuminators are that they are long life (>30,000h) and since they can be pulsed at very high speed, their use in place of the colour wheel addresses the historical issue of the colour break-up, or 'rainbow' artefacts. Certainly the way to go!

Posted Sep 17, 2010 12:52:01 PM

By leslie r

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i think if you really read it and take the time to understand it all it really does make sense!

Posted Sep 15, 2010 1:16:50 PM

By Anyely

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I think this articles were pretty cool because they talked about LCD and DLP and it explain what they are and how they work :0

Posted Sep 15, 2010 1:11:58 PM

By leslie r

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i think this artical is about LCD's and how the they work and contribute easier access to what the LCDis showing. And then lower down the artical there are some people who wrote what they thought on this artical. The LCD projector shows what you want to show without a blure.

Posted Sep 15, 2010 9:32:46 AM

By mikyla

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THIS IS ALOT TO READ!

Posted Jun 6, 2010 6:19:43 AM

By SDavies

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The statement that DLP chips do not degrade is no longer true. There is a now well-known propensity for the miniature mirrors on these chips to break down, sometimes after less than two years, causing a rash of white and black dots on the viewing screen. This ruins the quality of the viewing experience and is an expensive repair. It is happening to my Mitsubishi 65" flat-screen now (after the warranty period, of course).

Posted Jun 3, 2010 5:50:56 PM

By Mark Laposky

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Just exactly what I was looking for! Thought that I would never find it. Good article & unbiased. But, after reading, I've decided to go DLP and am now concious of the importance filters and seals. Thanks.

Posted May 28, 2010 7:44:28 AM

By ron

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guys what is better 3LCD or DLP projectors? What should i buy for a shop window? To get good image in day light also

Posted Mar 11, 2010 5:35:38 PM

By Medenyx

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Agree with you David!

Posted Feb 2, 2010 8:44:38 PM

By David

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With 3d-ready projectors hitting the market, it might be time to update this article with a discussion of the effects of each technology on 3d content (i.e., image persistence).

Posted Jan 23, 2010 12:14:10 AM

By Steve Linke

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Nice article. Could anybody direct me to where I could get a copy of the Texas Instruments DLP vs. LCD testing, which was apparently published back in 2003? Thanks.

Posted Jan 22, 2010 3:45:16 PM

By Glenn

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I would like to say that the article was well written and thought out covering the pros and cons of both technologies. From my experiences, (Pany PTAX200U 3LCD home theater projector), I would have to conclude that the technology you choose is dependent on your application. After 1800hrs my pany developed a yellow blob that started spreading. It is currently in the shop for repair. Polorizer replacement. I bought my pany because I had the idea that I would use it sparingly to watch movies, occasional sports and HDTV events perhaps 1-4 hours per day. Also what sold me was my ability to place it where i wanted and to take it out on the deck for outdoor movie night. Well the big screen, 120' silver cinema, and projector combination was so enjoyable and crisp that it was hard to resist not using it for everyday watching. That upped my hours to 6 hours a week night and 10 to 12 hours during the weekends. There is a small disclaimer in the manual that says if watched for more than 6 hours at a time it is possible that repairs may be needed within the first year. Well I'm experiencing that. At first I was mad and upset that this product was so wretched. After I got over my inital shock that my projector was down I have made decision to prolong the life of my projector. A pop up flat panel for daily viewing and of course the big screen for event and family times. Again I cant stree enough that purchasing the right technology for the right application will ease your headaches. If you want to replace your TV with a projector then DLP is a great way to go unless you have placement issues or issue with rainbows. If you use your projector for a Dedicated home theater the picture quality, contrast, lumens, and price point can make both technologies very attractive.

Posted Oct 7, 2009 11:09:32 AM

By Scott

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I have found that in budget projectors, we have better luck with LCD models over DLP. They have better color overall. Our DLP projectors had the wheel start to loose it's color, loosing the intensity of the colors except for while. But in High End projectors, In DLP they tend to add more colors to the wheel and have a better Image. Lower end=LCD generally better, Higher end=DLP generally better. Both have improved a lot from where they've come from

Posted Sep 29, 2009 3:01:25 AM

By Sunny Mathew

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We are a christian organization using the projectors for presentation of Gospel. we are having 325 LCD projectors, and recently purchase 100 DLP projectors. In the beginning we were using a single chip LCD projector and the brightness of the projector remained for the same after 1000 hrs of use. but when we start using the Panasonic 3LCD projectors, the performance was very good in the beginning and the brightness came down after 500 hrs of use and after 2000 hrs, even after changing the lamp with a brand new lamp the brightness is very very poor. My question - will this happen to our DLP projectors, we are using for the outdoor programs? can any one answer?

Posted Sep 22, 2009 7:50:40 PM

By Hernan H

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I´m From south america. It`s important? YES, because we see a lot a movies in english with subtitles...and when you look up and down reading the subtitles...or you finishing reading a subtitle..your eyes go to down-right the screen..and then...you move your vision up.. this contiuous eye exercise makes the Rainbow effect more noticiable...I know DLP has more contrast...the LCD degrades (yellow spots in less than 2000 hours) but...I cannot live with the Rainbow eff. everytime I move my eyes from the movie to the subtitle...and so on.... Just my subjetive opinion...( sorry for my english!!)

Posted Sep 22, 2009 2:42:30 PM

By steve

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Quote:Posted Sep 3, 2009 12:42:44 AM By Dallas Alert Moderator

Thankyou for a well balanced opinion on the subject. I'm amazed at the amount of false propaganda there is on the web about DLP projectors, the LCD lobby needs to get over itself. I've been using a Sharp Z90 DLP HT projector for about four years (~3000 hrs on lamp). It's an early 800x600 model with a 1200:1 contrast ratio (low by todays standards), with lens shift and it has given me faultless brilliant pictures from the day I installed it. Weather it's dvd, digital tv and even my old vcr I've always been happy with it's performance. And I'd like to point out, contrary to the so called dlp review on the AIM web site on no occasion have I or my friends ever had a problem with the "rainbow effect", or Migraine headaches, or epilepsy. In fact the only way I've been able to see the dreaded RB effect is to dart my eyes around or move my head quickly back and forth, funny I've never needed to do that while watching a movie, at home or at the theatre. I'll stop my rant now except to correct one comment, the D-ILA light engine isn't like the DLP, in the D-ILA the light source still passes through the LCD to get to the mirror. When I upgrade to 1080p I'll be going DLP, but each to his\her own I suppose.

Great article Evan.

Dallas: I wish to correct your earlier post "that in the D-ILA the light source still passes through the LCD to get to the mirror". This is wrong.

JVC D-ILA is LCOS technology, as is Sony's SXRD. Light is reflected off the chip face, rather than passing through it as it would a LCD panel. It is reflective not transmissive of the light source, just as in DLP.

Posted Sep 15, 2009 8:20:33 AM

By Nazeneen Strickland

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Wow i didnt think of it like that.I didnt know how much computers are worth and their value to others.I didnt realize howdiffernt and expense computers just because of their charistics.

Posted Sep 15, 2009 6:55:57 AM

By Marc

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Like Richard, I have owned many projectors (12) in the past 10 years due to entertainment conferences I run multiple times a year. We use the projectors with computers and Blu-ray. DLP just blows LCD out of the water for quality of picture. It just doesn't make sense to me that someone would still purchase LCD.

Posted Sep 11, 2009 7:00:56 AM

By b. scott

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Brilliant article! Just a comment about "rainbow effects", as a visual artist having experienced this with DLP projectors, it's not like the other plus/minus comparisons between the technologies, the nausea induced by the rainbow effect, which lots of people experience to varying degrees, in my case is so intense, it's the visual equivalent of being shot in the face, or jumping out of a plane without a parachute. if you don't experience it, it's easy to dismiss as a minor consideration, but those who do experience it intensely won't, in fact cannot, watch DLP under any circumstances. so for home theatre, which only has to work for the household and friends, DLP might be fine. but if you are projecting to a wider audience, it's just about the most important thing to consider, far more important than any differences a projector might have in lumens, contrast, color saturation, etc.

Posted Sep 10, 2009 4:50:52 PM

By Doug

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With LED light sources coming on line in he next few years, this could give the DLPs larger market share. LEDs are a good fit with DLPs because elimination of the color wheel costs and also thereby eliminating the need to throw away 2/3rds of the light. Assuming the the Vivitek review performance is the shape of things to come, LED/DLP photons will be hard to beat. Full On/Off contrast 100,000:1 ANSI contrast 844:1 Large color Gamut

Posted Sep 6, 2009 11:52:45 AM

By Vasastan

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Great article! Regarding the LCD lifespan issue, my Panasonic PT-AE700E has just developed a blue "stain" across the right third of the image. It was bought in 2005, and we have used it pretty heavily since then - about 3500 hours (!) on the first lamp, close to 1000 and running on the second. We have used the low lamp, low fan mode throughout. The filter is cleaned occasionally, although not as often as recommended. I feel a bit cheated by Panasonic (and other LCD projector manufacturers) for not warning about this before. Coming from an engineering background, I find it hard to believe that they would release a consumer product without extensive life and stress testing of the components, so they have most probably known about this issue for a long time.

Posted Sep 3, 2009 12:42:44 AM

By Dallas

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Thankyou for a well balanced opinion on the subject. I'm amazed at the amount of false propaganda there is on the web about DLP projectors, the LCD lobby needs to get over itself. I've been using a Sharp Z90 DLP HT projector for about four years (~3000 hrs on lamp). It's an early 800x600 model with a 1200:1 contrast ratio (low by todays standards), with lens shift and it has given me faultless brilliant pictures from the day I installed it. Weather it's dvd, digital tv and even my old vcr I've always been happy with it's performance. And I'd like to point out, contrary to the so called dlp review on the AIM web site on no occasion have I or my friends ever had a problem with the "rainbow effect", or Migraine headaches, or epilepsy. In fact the only way I've been able to see the dreaded RB effect is to dart my eyes around or move my head quickly back and forth, funny I've never needed to do that while watching a movie, at home or at the theatre. I'll stop my rant now except to correct one comment, the D-ILA light engine isn't like the DLP, in the D-ILA the light source still passes through the LCD to get to the mirror. When I upgrade to 1080p I'll be going DLP, but each to his\her own I suppose.

Great article Evan.

Posted Sep 1, 2009 11:29:58 AM

By Stunko

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Confusion still rulz, plus everyone has his/her favorite technology, anyhow.

Of all the different types of PJ display panel (chip) technology, only the monopolistic Texas Instruments is still peddling primitive single-chip models. Personally, I would not buy a single-chip technology projector for any money, whether it is DLP, LCD, LCoS, D-ILA, SXRD, or whatever. But then again, only TI still peddles single-chip DLP PJs anymore, so it is a rather easy choice for me as what NOT to get.

I would also not get any projector with no lens-shift and with only a fixed focal lens or a retarded 1.15x to 1.3x focal range zoom lens. So, that bars the single-chip DLP units once again.

Three-panel DLP PJs are better, but again due to the TI monopoly pricing, they cost at least 300% as much as they should really be going for. And they have many of the disadvantages of their single-panel color-wheel models.

I found that for the money, you cannot beat the JVC D-ILA PJs, as their projected image is just as good as that attainable with 3-chip DLP PJs for a fraction of the price. And it is a reflective technology, like DLP is. Colors are very much analog looking, so to me D-ILA will give you the color spacing closest to Fuji and Eastman positive (projection) film stock.

With respect to the light sources, hopefully by the Christmas 2010 shopping season, we shall have a good selection of LED-lamp source HT PJs in both DLP and LCD designs.

Posted Aug 29, 2009 5:35:36 AM

By Tony Glover

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I have to admit this has proven a very interesting article along with all the varioius comments. I myself was all set to purchase LCD and until I saw a DLP at the last minute. Both offered a very good picture in movie mode with the LCD possibly just better because of the blacks. I'm no expert, just a an average Joe but HD TV on DLP did seem more natural than the LCD. The other factor was a massive price reduction and a free replacement bulb sealed the deal.

It will be interesting to see if any of the problems with DLP occur over the next few years, but should projectors head the way of flat panel screens over the last couple of years, both LCD/DLP projectors will end up being a throw away item anyway and all this 'Mine is better than yours' discussions won't mean a thing...lol

Posted Aug 26, 2009 10:26:06 AM

By Nagappa

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A very enlightening article and echos my findings with low-cost projectors.

I have an Infocus X1 DLP with SVGA resolution and a Sanyo PLC-XW60 3LCD with XGA resolution. When using a video setup DVD to calibrate the projectors, I found the Sanyo (3LCD) did better with the video benchmarks than the Infocus (DLP). When projecting from a computer at SVGA (800 x 600) resolution, the LCD image was sharper than the DLP. The screen door effect is not so prominent on the 3LCD due to the smaller inter-pixel gap.

However, when watching home movies after calibration, I found the DLP to do a better job with colors and black levels in dark scenes. The LCD's colors were over-saturated in the darker scenes with an over emphasis on the reds and pinks. I had to re-calibrate the LCD projector to avoid this effect. The DLP projector seemed to have a more natural color contrast and balance at lower light levels, giving the impression of being more "film-like".

Therefore, my rule of thumb for low-cost projectors is LCD is better for PowerPoint while DLP is the better for home theater (if you are not able to notice the "rainbow effect").

Posted Aug 17, 2009 9:58:36 AM

By Mike

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Great article! It's nice to read a up-to-date comprehensive comparison of the two technologies: LCD and DLP. I remember researching vividly a few years ago with my first projector, trying to read through all of the various articles to get a real-world assessment of which technology was better.

I cannot wait to read a follow-up article to this, LCOS (SXRD) versus LCD & DLP. Please get that article posted.

Posted Aug 14, 2009 9:02:45 AM

By Aamir A.Farooqi

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In terms of image balance my experience is that LCD's are much better then any DLP's. I couldn't see any normal range US$ 1200 to 2000 DLP Projector that gives true yellow color. Ofcourse color saturation is indeed an important element. Most normal range DLP's are cheaper then LCD's but if I get a balnced image in LCD @ 2500 or 3000 Lumens say 500:1 then there is no fun to choose a 2000:1 + and get unbalanced image. Isn't it???

Posted Aug 2, 2009 11:43:00 PM

By Jason

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Does anyone know if LCOS panels are organic or inorganic? I have a canon SX60 that is coming to the end of it's 3 year warranty and have noticed some color artifacts in the corners(green and pink half round shadows) could this be dust or is it the panels burning out? I wait for the LCoS article with great anticipation.

Posted Aug 2, 2009 2:03:17 AM

By kevinp

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I Suspect that LCD Projectors will be fast enough to do 3D by the time you are able to buy Blu Ray Discs / 3D Player with a "proper" 3D Standard. In the longer term I suspect Laser Technology may be the best.

Posted Aug 1, 2009 4:40:00 PM

By brett

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LCD is a very tough sell to me at this point after experiencing the debacle that was the Sanyo PLV-Z3. The blue polarizer only lasted 14 months in an air-conditioned room with HEPA filtration, 800 hours of use, and filters cleaned every month. Sanyo of course insisted neglect of the filters like they were doing to everyone at that time and refused warranty service. As a result I replaced that unit with a Mitsu HD1000U DLP which still performs like the day it was mounted(now about three years ago) and the company I work for no longer uses Sanyo products.

Posted Aug 1, 2009 4:07:58 AM

By Magnus L

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oh!! I forgot the Lamptime on the LED´s....was it 20000 hours expected...

Posted Aug 1, 2009 4:05:14 AM

By Magnus L

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this is just my 2 cents off future fortelling: I belive that single DLP Technology is gonna be the future technology when its combined with LED lighting technology...

it removes the color wheel and thereby RBE issue that has been a trouble for some (I am abit sensetive too) when it comes to DLP..and I Would not be surprised if Dithering artifacts will dissapear aswell since the LED can be adjust for brightness on every mirror.

this Adjusting the LED´s will make the DLP/LED projectors superior in contrast (already demoed prototypes with over 100000:1 ratio without an Iris). and since they have been superior in sharpness (atleast i think so) and much less motionblur (wich is a big issue for me) the DLP Technology will rule the future (unless LCD or LCOS do somthing about their lag!!!)

Comments welcomeon this....

Posted Jul 31, 2009 10:24:39 PM

By Darin

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mikeb: "If an LCD panel can produce for example 2000 Lumens at white (all 3 panels on full), then how can it produce 2000 Color Lumens?"

The Color Lumens rating would be red by itself, plus green by itself, plus blue by itself. So you are right that red wouldn't be 2000 lumens, but if the 2000 Color Lumens is with color balance equal to D65 then the amount of red would be the amount that is called for by a standard when white is 2000 lumens, or in other words, red would be the correct percentage of white, not a lower percentage of white than called for (as happens with a white segment going where each color by itself is dimmer than is standard for that much white).

Posted Jul 31, 2009 8:58:32 PM

By Mischa Lockton

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As someone that both rents out projectors and easily gets DLP rainbows + headaches, I refuse to look at DLP ever again- it hurt my head besides ruining the content.

I also would not want to subject any of the audience to possible artifacts that I may not even see myself- even 1% of the paying audience is unacceptable. Therefore, while newer DLP based projectors may reduce or eliminate the problem for a larger % of people, I can't take that risk!

I can verify the 3-chip models are totally different with no artifacts, but those are too much money.

Sorry TI, I loved my speak-and-spell, but DLP with spinning color wheels is never going to be an option for me!

Posted Jul 31, 2009 9:49:41 AM

By Tim

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I find 3LCD to be a flat technology. It's gone about as far as it can go in terms of applications. Can 3LCD project a 3D image from a single projector like the new DLP units can? With all the new movies coming out in 3D from Hollywood, I want to make sure I'm going to get a HT projection system that can show movies the way they were intended to be seen.

For me DLP is the only way to go. You don't have to worry about color decay and cleaning filters. When I change the lamp on my DLP projector, the image looks just like the image when I bought it 3 years ago.

Posted Jul 31, 2009 8:56:13 AM

By Isaac Kuo

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I've never understood the problem with the "screen door" effect. If you want to eliminate the screen door effect, you just slightly defocus the lens. This eliminates the edges with a smooth gaussian blur.

Posted Jul 30, 2009 12:03:08 PM

By Norman T

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Strangely enough my experiences with LCD life issues agree with both eumigfan and Rick above.

When the Panasonic PT-AE700U 3LCD projector was the hot new player on the price/performance curve I installed two of them. One was in a friend’s dedicated home theater and the second was in my family’s home theater/living room.

The AE700U in the dedicated home theater still looks great after almost 5 years of service.

The AE700U in my home developed severe blue discoloration in the lower left side of the image due to the organic LCD panels. One can find many users so afflicted on the forums. Of course this did not come up when the AE700 was the hot new piece because no one had the hours on it necessary to cook the panels.

I believe one of these samples is still looking good and the other is barely watchable because of how they are/were used. In the dedicated home theater my friend’s unit was on for 1-3 hours at a time to watch a movie or two then shut down. In our combined home theater/living room the projector was used for both movies and general TV watching. Its death was hastened when my son hurt his foot and spent the all summer long recovery process watching hours of movies, games, and cable TV. It was after this stint of being on 8-16 hours a day I noticed the beginnings of the blue discoloration.

When the second bulb in our AE700 was used up I could not bring myself to spend $375 to watch 1/3 blue HDTV. As a stopgap I purchased a factory refurbished 1024x768 DLP projector for less than the cost of a new bulb for the AE700. The picture is not bad, I can see it is not as good as the new AE700 was or the 1080P Toshiba flat panel we have in the den, but the family thinks it looks good. My hope is by the time the XGA DLP projector needs a new bulb the market has an affordable 1080P inorganic 3LCD or DLP projector using LED lighting.

Posted Jul 30, 2009 11:55:03 AM

By Pat

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This is the first I've heard that dust deposits lead to the lamp becoming dim. I find this a little hard to believe. If it were true then LCD projectors with dust filters would have substantially longer bulb lives than filterless DLP projectors. I don't think this is true.

Also I used to periodically clean inside my first projector an InFocus X-1. The color wheel got grayed out by deposits not the bulb. Wiping off the color wheel greatly improved the image brightness. I believe that this deposit was from plastic volatiles that had settled on the relatively cool color wheel. I don't think it was melted dust. Am I wrong?

Lastly, why are there no single chip LCoS projectors? LCoS is refelective like DLP? It should I would have thought been a good candidate for for a one chip/color wheel design. Maybe its the speed question?

What does a DLP chip cost?

Posted Jul 29, 2009 12:44:44 PM

By eumigfan

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What a great article! Very fair and balanced- unlike some news channels! I have had a Panasonic AE700 LCD projector for 5 years now and have had no dust blobs or PQ degradation whatosever. I am still using the original bulb, and the picture is still stunning. I love the 2X zoom lens and wide-range lens shift which lets me mount the projector out of sight on a rear shelf. I just would not take the risk of seeing the DLP artifacts, so my next projector will definately be 3LCD.

Posted Jul 29, 2009 9:52:27 AM

By Thomas

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Is there any anecdotal evidence that inorganic LCD panels do last longer? I'd be particularly interested in hearing from someone like Richard who appears to really put projectors through their paces.

I have to wonder if the fact that TI has not published the results of a study on inorganic LCD means that the panel life is long enough to be a non-issue. This isn't evidence in itself, but it is one plausible explanation.

I've had a DLP projector in the past and was relatively happy with it. I've been considering LCD, mainly because of the placement flexibility of zoom & lens shift, but things like dust blobs and panel life have made it difficult to pull the trigger on those purchases.

It would have been interesting to hear details on why DLP cannot have the zoom and lens shift flexibility of LCD. I've heard the lens shift is because of the issue of bouncing of the light off the DLP chip through the color wheel and then through the lens so that in order to shift the lens you'd have to move the entire light path. I've not heard any reasoning for the lack of zoom found on DLP.

Wish the LCoS comparison had been included with this article, but will wait patiently for it and hopefully it will compare and contrast against DLP/LCD and not simply be a stand alone tech summary.

Posted Jul 29, 2009 8:47:42 AM

By mikeb

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If an LCD panel can produce for example 2000 Lumens at white (all 3 panels on full), then how can it produce 2000 Color Lumens? Like if it's a Red color being displayed, it wouldn' t use all 3 panels on full thus the Lumen output would have to be greatly reduced. It would be primarily the red panel on and the other would be off or greatly reduced.

Posted Jul 29, 2009 7:29:54 AM

By Richard

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Owner of 14 projectors I have used both LCD and DLP projectors in a 24 hour a day operation with static images on the screen for the most part. I have found DLP projectors out perform LCD in many areas. I have middle of the road $5k DLP projectors and one high end >$12k all of which have lasted years longer than my LCD projectors all of which were >$10k. I actually replaced LCD panels regularly in one manufacturers and the burn out was quick. The other projector was cost prohibitive to replace. I will go with DLP unless the unit is not used much.

Posted Jul 29, 2009 6:59:41 AM

By Rick

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Based on my experience with LCD projectors, my rule of thumb for organic LCD panel degradation is to assume that the projector will be unusable by the time you finish the second bulb. So if the bulb is rated at 3000 hours, I would assume a useful life of the projector at no more than 6000 hours. If you use such an organic LCD projector as a TV replacement you will likely have to replace it every few years.

Posted Jul 28, 2009 8:37:42 PM

By Michael Belsh

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A good read indeed! Thanks so much for giving the information you did.

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