What's the Difference: LCD vs. DLP Pt. 2

Image courtesy of Christie Digital

Image courtesy of Christie Digital

Last time, we touched on the basic, underlying technology of LCD and DLP imaging systems. Today, we’ll look at some of the pros and cons. As I said last time, much has been written on this subject and I’m not going to exhaustive here. If you want a very thorough look at this, albeit from a home theater projector perspective, check out this article at Projector Central

LCD Pros

  • LCD projectors are generally less expensive than 1-DLP units at a given brightness. This is a general rule, and there are plenty of exceptions. But if budget is a big concern, look to LCD.
  • LCD generally has better contrast. This is relative, however. Keep in mind, you’re shooting the image onto a white screen. So the blackest the image will ever get is as black as the white screen ever gets. 
  • No rainbow effect. I sometimes notice a slight jitter in DLP images. It’s not always readily apparent, and I’m a trained observer. But LCD images tend to be pretty rock-solid. 
  • Better apparent resolution. Because the pixels are very clearly defined, graphics tend to look sharper on LCD projectors. To some extent, this is academic now that we’re getting up to 1920x1080 chipsets in both technologies, and given the average viewing distances. But there is a difference. 
  • Better color saturation. Because a DLP color wheel typically has a white slot in it to boost brightness, the color saturation can be lower. LCDs behave more like LED lights; the brighter they are the more saturated they get. 

LCD Cons

  • Lifespan of panels. We don’t really know how long the LCD panels will last before they start breaking down. We do know they break down and the colors start to shift. Newer inorganic panels seem to hold up better than older organic designs, but some are projecting the life of an LCD panel to be between 4,000-10,000 hours. That could be 1-3 bulb changes. Of course, a lot of those tests are being done by DLP makers, so… If you are using your projector for a few hours on the weekend, and occasionally during the week, this is probably not an issue. In a big command center where projectors are on 24/7 for years, this is a problem.
  • Dust. The LCD engine is not sealed, so it’s possible dust can get in there. This is less of a problem with pro-grade projectors that have good filtration systems. Still, if you have a dusty environment, be aware of this. 
  • Screen door effect. Because the edges of the pixels are so well defined, you can sometimes see the spaces between them. It looks a bit like viewing the image through a screen door. Again, with higher resolution and tighter pixel pitch, this is less of a problem than it used to be. 
  • Mis-convergence. Because an LCD image is made up of three images of different colors, they have to be lined up perfectly. If they are not, you’ll see fringing of color on vertical or horizontal lines. Again, with newer, pro-level projectors this is less of a problem. But it does show up on budget models.

There’s a look at the LCD. On Friday, we’ll wrap this up with a look at DLP pros and cons, and some concluding thoughts on which one is better.

“Gear

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What's the Difference: LCD vs. DLP Pt. 1

LCD or DLP? This is a great debate that has raged on for years. Some of the debate is fueled by technology, much more is fueled by marketing. Thankfully, manufacturers in both camps have been steadily improving their respective technologies over the years, and the difference is now smaller than ever. I believe for most applications, the technology inside the projector is now less important than the service, support, price and brightness; and the suitability for the application. But we’ll get to that shortly.

Much has been written about this subject, and rather than attempt to rehash all of that, I’m going to give you an overview of the two technologies along with some links to learn more. Let’s start off with a basic overview of how the two methods produce a picture. In reverse alpha order, LCD first. 

All LCD Projectors are 3 Chip Designs

LCD stands for Liquid Crystal Display. You may see some projectors labeled 3LCD or being touted as having three chips as opposed to 1. The marketing difference compares not to single-chip LCD projectors (there are none), but to single-chip DLPs—the primary competitor to LCDs. Below is an example, albeit a highly simplified one, of how an LCD projector produces an image. 

Image courtesy of Christie Digital

Image courtesy of Christie Digital

The light from the bulb(s) is split into three parts. It passes through three LCD panels (red, green & blue), and then re-combined. The result is a color image. The LCD panel has millions of pixels that can be open, closed or partially open. When open, light passes through and a color (or white if they’re all open) is produced. 

DLP is all Smoke and Mirrors

Well, technically no smoke. Unless you count the magic smoke that all electronics run on. Let the magic smoke out, and they stop working. But I digress. Below you’ll see an image of a typical single-chip DLP engine. As you can see, it’s a bit more complex. DLP stands for Digital Light Projection, and was developed by Texas Instruments. It’s essentially a chip full of thousands of little mirrors. The mirrors tilt either toward or away from the lens producing light or not. Because it’s a single chip, there is a color wheel in the system to produce the various colors.

Image courtesy of Christie Digital

Image courtesy of Christie Digital

The technology takes advantage of a phenomenon in our vision called persistence of vision. Our eyes see relatively slowly. And what we see tends to stay there for a little bit. The DLP engine will flash the red portion of the image on the screen and sometime between 1/60th and 1/240th of a second later will then flash the green portion. Then the blue, then back to red. Some projectors event throw in yellow, magenta and cyan for good measure. In that short time frame, the red doesn’t full fade away—at least in our eyes. So when the green and blue parts pop up, we see it as one color. It’s crazy, but it works.

The downside is that some people have faster vision than others and can actually see each color individually. This is called the rainbow effect. It’s less of a problem now than it used to be; companies have sped up the rotation of the wheel to mitigate the effect. But if you can see it, you can’t un-see it, so to speak. 

3-Chip DLP is the Same, Only More

A 3-chip DLP projector is very similar to a single-chip, only there are three; one for red, green and blue. The rainbow effect doesn’t come into play in a 3 DLP design because there is no spinning color wheel. When you look at the above diagram, you can see why 3 DLP designs are so expensive; there’s a lot of stuff going on in there. You do get a good-looking image out of all the complexity, however. 

Does It Matter?

One of the questions I always ask when evaluating competing technologies is, “Does it matter?” When it comes to LCD vs. DLP, for the me the answer is yes. And no. The technology has advanced to a point where at a given price point, either will produce an acceptable image. So to some extent, the answer is no, it doesn't matter. However, there are pros and cons for each technology, and one may be better suited for your application than the other. We’ll talk about that next time.

Roland

Today's post is brought to you by CCI Solutions. With a reputation for excellence, technical expertise and competitive pricing, CCI Solutions has served churches across the US in their media, equipment, design and installation needs for over 35 years.

Introverted Leaders

Photo courtesy of Andy Roberts

Photo courtesy of Andy Roberts

Introverted leaders. Does that sound like an oxymoron? One of the biggest challenges technical leaders face is that most of us are introverts in culture that favors extroverts. As more churches call on their technicians move from being doers to leaders and developers of teams, we have a big, steep hill to climb. But there is good news; we are in good company. In fact, I would suggest (and I’m not the only one to do so) that Moses himself was an introvert. 

Consider this; he spent most of his adult life wandering around the desert. By himself. He seemed perfectly content to not interact with anyone but his flocks. Of animals. Who didn’t talk back or ask him questions. Sounds like a dream come true, right? OK, maybe not, but my guess is many of you (and I) would much rather spend our days in a quiet, empty tech booth wiring, programming, mixing or editing than surrounded by a large group of people. 

When God called Moses out to lead His people, Moses’ first response was, “I am slow of speech…” (Exodus 4:10). Moses wasn’t stupid; he was introverted. He didn’t think out loud; he processed his thoughts internally then spoke purposefully. Again, sound familiar? Extroverts tend to think introverts are either slow or aloof because we’re spending more time thinking than talking, but I know so many of you, and it’s not true. You’re smart and caring; you just display it differently.

So how do we, fellow introverts, survive and perhaps even thrive as leaders in an extroverted church culture? Well, I have a few ideas. Much of this comes from a book I read last year, Introverts in the Church: Finding Our Place in an Extroverted Culture by Adam S. McHugh. I highly recommend it. There is treasure trove of content in that book, but I’ll pull out a few principles that have already helped reshape my thinking. 

Know Who You Are in Christ

McHugh writes, “We cannot find freedom in our introversion until we embrace our primary identities as sons and daughters of God.” Regardless of our introversion or extroversion, our Myer’s-Briggs profile, our SHAPE or our strengths, we are children of God and therefore significant, important and most importantly, called. We are called to do what we’re doing, and when God calls someone into a task, He equips them. Therefore, you have everything you need to lead your team successfully; you simply need to lean on Christ as the source of your strength. Trust Him to lead your leadership.

Re-Think Leadership

Many tend to picture leaders as the loud, outspoken, charismatic ones that people naturally follow. And sometimes that’s true. But perhaps that’s just the loudest voice getting all the attention at the moment. McHugh says this about leadership: “Leaders give people a lens and a language for understanding their work and experiences in light of larger purposes.” You don’t have to be a charismatic public speaker to lead people if that is your definition. Giving people a lens is something that you can do every weekend when the volunteers show up to do their jobs. You don’t have to do it in big groups, nor do you have to lead a thousand people to make a difference. 

Re-Imagine Your Impact

At times, we introverts can feel inferior to the extroverts around us because our circles of influence are smaller. But instead of feeling like our introversion is a liability to leading others, perhaps we should consider it an asset. Again, to quote McHugh: “At times I have compared myself negatively with my extroverted counterparts who have more widespread influence. But I have come to see this ‘limitation’ as an opportunity to have a deeper impact on the people I do influence.”

Generally speaking, technical teams tend to be smaller, which favors our strength. While we may not influence hundreds or thousands, those we do influence will get much more from us. We have an amazing opportunity to make a lasting impact on those on our teams. Our natural ability to listen, get to know people and speak wisely will have a radical effect on our volunteers. 

As introverts, we have a great opportunity in front of us. What some perceive as a weakness is actually a significant strength that has potential to be a transformative force in people’s lives. But we can’t allow our natural tendency to prefer alone times to isolate us from community. While we may not count dozens of “close” friends, we should have a few, and we should be intentional about investing in a small group of people. Pray about who those people should be, then begin pouring into their lives. Your impact will be profound!

“Gear

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