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Today's multimedia video projectors represent a versatile, practical, and affordable tool that can serve different purposes both in the business as well as in the home entertainment arena.
The fall in price and the developments in video projection technology we have experienced during these last few years, have made the digital projector even more accessible to a larger group of home users.
Demand has increased to such an extent that manufactures are not only producing what are referred to as 'cross-over' models - i.e. projectors that can handle both PowerPoint presentations in the office as well as DVD movies at home, but they have also started to target the home entertainment domain by producing models specifically designed for home theater use. ...why?
It is true that 'cross-over' projectors can handle both worlds, but this does not mean that a video projector that can deliver a great presentation in the boardroom is also capable of delivering a great cinematic experience in the home theater.
Home theater projectors and business projectors have to fulfill distinct requirements in their use which can only be met if the video projector is specifically designed for the purpose.
What characteristics differentiate Business Video Projectors from Home Theater Projectors?
It is no surprise that video projectors are becoming a popular choice with many home theater enthusiasts. The digital projector can deliver the largest image for your dollar. Simply hook up your DVD and there you have the most cinema-like image in the home theater. Or connect a HDTV source such as a cable set-top box or satellite receiver, and there you have a huge 100" HDTV for the cost of a 50" plasma TV.
And in the boardroom, today's powerful digital multimedia projectors are proving to be more than ideal for business presentations; they are capable of delivering bright huge images under normal ambient room lighting - something only dreamt of in the days of the overhead projector. Simply plug in your laptop, and there you have the most fantastic business presentation in the world!
However, it is important to keep in mind that the boardroom and the home theater are two different arenas that require different beasts. The distinct requirements between the two are important; the discussion that follows explains what video projector attributes should apply in these two cases.
Important Projector Attributes
The brightness level (measured in lumens or ANSI-Lumens) is an indication of the level of light thrown out by the projector. Brightness is a lot more important for business use - this in view that many presentations are given in conference rooms with standard office lighting rather than in reduced ambient light. This means that the image needs to be bright enough to be seen, otherwise the projection would look washed out.
For small boardrooms and presentations with a lot of ambient light, a brightness of around 1000 to 1500 lumens should normally be fine. However, keep in mind that the projector brightness required depends on the projected screen size, the level of ambient light, and the projection screen gain (more on this in our projector screen guide).
For home theater applications, a high brightness level is not important. Some video projectors intended for home theater use come with bulb setting to enable the user to dim the light source for improved viewing and deeper blacks when viewing takes place in a darkened room.
As discussed in our Contrast Ratio article, even a minimal level of ambient light may render a high contrast image of say 5000:1 similar to one with a contrast ratio of 500:1. This means that though a minimum level of contrast is important for the eye to perceive a sufficient bright image, yet contrast is not an important attribute in business applications, nor it is in home use if one will be using the projector in the living room with the lights turned on.
In reality, anything above 400:1 for the contrast ratio would not be perceived by the eye if viewing does not take place in a completely darkened environment. In addition, due to the eye's contrast sensitivity function, a contrast ratio of say 2000:1 would not be perceived as five times better than one with a contrast ratio of 400:1. Therefore, pay more and go for a high contrast ratio only in the case of a home theater projector and as long as viewing takes place under controlled lighting.
Color, Gray-Scale Performance, and Smooth Video Playback:
These are all attributes that are more critical in home theater applications. In fact, color accuracy with natural-looking skin tones and capability to present subtle detail in bright and dark areas of the image matter more to the home user.
Similarly, the projector's ability to present smooth, video playback with no added motion artifacts, when presenting fast action sports and movie scenes, is of prime importance in any home theater application.
LCD or DLP:
It all depends. Strictly speaking, both technologies can do a good job in either of these applications in that advancement in technology has closed the gap between the two. Yet LCD projectors are normally the primary choice with business projectors in view that these still have a brightness edge over DLP.
On the other hand, DLP is still the favored technology when it comes to home theater use due to their improved black level performance and smoother looking projections that resembles more closely those at the movie theater.
This is a major issue with the business video projector. Smaller and lighter is better, especially if you travel frequently. Weight is more of an issue for the business user. Business mobile professionals will want to hook up a lightweight projector to a computer or laptop, projecting an image on a large screen or wall for presentations.
Most business-oriented projectors weigh just a few pounds - some very light business models weigh no more than three pounds! These video projectors usually come with carrying cases and wireless remote controls that enable the user to control not only the projector, but also to send commands to the PC through appropriate connectivity. Some remotes include an integrated laser pointer.
Most multimedia projectors under this category come with a small integrated speaker for the sound; more expensive projectors have security features such as locking cables, etc.
Portability issue is of no concern in the home theater. One would normally setup a fixed place for the projector. For home theater projectors, the best installation spot is on the ceiling. This means that some planning has to go into how it is best to run cables into the ceiling to connect your projector with the rest of your home theater gear.
Video Projector Connectivity
It is critical that your video projector comes equipped with the appropriate inputs to enable you to connect with your PC or laptop in the case of a business projector, and home theater gear, DVD, or HDTV set-top-box in the case of a home theater projector.
It is clear that connectivity requirements between these two video projector categories vary.
Most - but not all - models support component, composite, S-video, and RGB connectivity. Home theater projectors normally also include a DVI or an HDMI port; this is very useful when it comes to interconnecting with a compatible DVD player or HDTV set-top boxes.
One standard that is starting to show up more on video projectors, and that is most appropriate in the business arena, is the M1, EVC, or P&D standard; this is most commonly referred to as M1 or M1-DA.
The M1 connector allows for the same connectivity as DVI – digital single or dual link or analog transmissions in the case of DVI-I. But the added advantage of the M1 over DVI is that the M1 also provides connectivity to the USB or FireWire port on your PC. The USB/FireWire connection is used to supply commands from the projector's remote control to the computer - thus allowing you to scroll through PowerPoint presentations, etc.
Our advice: Always check before you buy to be sure that the projector has the inputs you need.
Projector Resolution: SVGA, XGA or Widescreen (WVGA or WXGA)?
This refers to the native or optical resolution and measures the level of picture detail that the projector can handle without compressing (down-scaling) the number of pixels in the original video content. Downscaling degrades picture quality and leads to picture content loss.
This is probably by far the most important video projector attribute that differentiate business from home theater projectors. In reality, it is not the number of pixels but rather how these are arranged on the screen in terms of width vs height i.e. the native aspect ratio of the projector. SXGA (1280x1024) is currently the highest resolution available for portable projectors; these video projectors are relatively very expensive. Most common video projector resolutions in the 4:3 aspect ratio are XGA (1024x768 pixels) and SVGA (800x600 pixels).
Widescreen versions of SVGA (WVGA: 854x480) and XGA (WXGA: 1280x720) have also started to emerge. These enable better projections of widescreen 16:9 content.
Business Video Projectors: SVGA and XGA projectors are more suited for business presentations, with the higher resolution XGA projectors being more capable of showing fine detail in your slide show.
Many may thing that the higher the resolution the better - but this does not necessary apply in the case of the business projector. A word of caution here arise out of the fact that if the text on a PowerPoint slide makes use of a too small a font to show using an SVGA projector (and therefore it necessitates the need of an XGA projector), it means that probably, the audience at the very back would still not be able to read it. Surely, you do not want that. In these circumstances, the cheaper SVGA projector would - in most circumstances - be able to do more than a good job.
On the other hand, the XGA projector is the best option for presentations that include graphics, software demonstrations, or full Web pages; this resolution also represents a better match for laptop computer displays.
Home Theater Projectors: If you want to use a video projector to project a huge image on a screen in your home theater, then the higher the resolution, the better since you will be less likely to suffer from pixelation issues. It is true that pixelation disappears as one moves further away from the screen but in the home theater, many would prefer to move a little bit closer for a wider angle of view and a more immersing movie experience.
Although most SVGA projectors can display HD images from your HD cable tuner or satellite, they don't have enough resolution to do it justice. The two main HD resolution formats are 1080i (1920 x 1080 pixels) and 720p (1280 x 720 pixels). SVGA projectors, with 800 x 600 pixels of resolution, don't have the ability to display either format without downscaling.
Even with DVD content - which at 852x480, comes with a lower resolution than HDTV - the lower-priced SVGA projectors cannot do a good job with DVD movies. XGA, on the other hand, gets much closer but...
Both standard SVGA and XGA projectors have a native aspect ratio of 4:3, so the image corresponds to a standard computer screen or regular television. Widescreen content - such as that available from DVDs and HDTV programming - have an aspect ratio of 16:9. The best way to match this is to use a home theater projector with a widescreen native resolution; it is only in this way that you can avoid the letterboxing, image stretching, or image cropping, or other aspect ratio management techniques that are often used to present a 16:9 content on a 4:3 screen.
Widescreen projectors come in either WVGA or WXGA. Opting for the cheaper WVGA projector makes sense if you will be watching only DVD movies. For HDTV content, a WXGA projector is necessary. This will enable you to display all HDTV content up to 720p without re-scaling. You still will be able to see 1080i HDTV material on a WXGA projector but the projected image will have to be compressed to fit the 1920x1080 pixels in a 1080i or 1080p HDTV, in the available pixel field of a WXGA video projector.
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Andrew Ghigo – A Telecoms/Electronics engineer by profession. Editor and publisher of http://www.practical-home-theater-guide.com - a comprehensive home theater guide to home theater systems, product reviews and home theater design.
This article is an excerpt from a series of informative guides appearing under the Projection Television section of the site.
If you have been salivating for a true home theater experience a projector beats any of the new fangled television technologies any time.
Think about it, you can get images up to 120 inches whereas the largest plasmas or rear projection TVs are only 70 inches in diagonal length. Furthermore, these huge televisions cost an exorbitant amount ranging from $5000 to $10,000.
Compare them to budget projector models which sell for less than $1,500. Now's really a good time to consider them. They used to cost many thousands of dollars and prices have since fallen.
Now the market is in favor of new projector technologies such as LCD or DLP which utilize compact digital image chips which have brighter light output than CRT technologies. Now there's no need to completely see your movie in total darkness. A dimly lit room will do just as fine.
The older CRT technology were heavier at over 100 pounds. These new generation of projectors are compact and light. They weigh from 5 to 15 pounds. You can carry the lighter ones around. There's no need to rush home to watch your live sports programme. You can just simply bring it wherever you want. An example would be watching a movie in a friend's house. A compact projector is a great idea if you have several houses since there's no need to buy a projector for every home. One projector will do simply fine.
Their small size is a boon. They may either be placed on a coffee table or be mounted on a ceiling. Imagine the mammoth hulk of a projection TV taking up your previous living room space which otherwise could have been used in more better ways.
New projectors boast an array of connectivity options which regular television sets lack. You can hook it up to your PC enabling you to surf super sized web pages, watch slide show of your digital camera photos or play computer games.
Nowadays you have the option of either having a projection screen or simply using the wall to project the image on.
Setting up is easy and new projectors offer simpler solution. Normally your entertainment console consisting of all the various components such as DVD Player, Cable set top box and other AV components will be in front of the living room while the projector will be mounted at the back of the room. So how do you reconcile the difference in location for all these gizmos? You either had to move all the components back or simply lay cables from the various sources to the projector behind.
The writer is the webmaster of Buy Home Theater which covers the various aspects about buying a home theater.
Now there's all in one home theater with speakers and DVD player thrown in together in one unit. There's no need to worry about cables snaking from one end of the room to the other, not to mention the headache of setting up the projector system.
Another alternative would be wireless projector allowing you to bring your projector from room to room without worrying about wires and cables.
Projection televisions have been around for quite some time now. When first introduced, the images created by these sets were fuzzy and only viewable at a distance. As great strides in TV technology have been made, projection TV images have become sharper and more comparable to those of their competitors.
For people in the market for a large screen TV, either for a home theatre system or a classroom/boardroom presentation setting, a Projection TV is the most efficient choice. CRT or cathode ray tube set's size maxes out around 40", and at that size they are extremely heavy and bulky. Plasma displays are manageable with larger screen sizes but can be very expensive. Projection TV technology can create very large screen TVs which are not only manageable but affordable.
Projection televisions have four main components: a projector, screen, control panel, and a sound system. There are two main types of projectors used for these TVs: a transmissive projector, where light shines through the image forming element (CRT tube, LCD panel), and a reflective projector in which light is bounced off of the image forming element. In both projectors, a lens gets the image from the image forming element, magnifies the image and focuses it onto a screen. Top of the line projection TVs use primarily reflective projectors because the advances in reflective projector technology of late have been more progressive than those pertaining to transmissive projector technology.
The image forming elements used in transmissive projectors are CRTs and LCDs. TVs using a CRT for projection actually have a small (around 9" diagonal) television built in. A lens in front of this small, extremely bright CRT TV magnifies the image and projects it onto the screen. Three basic configurations are used in these sets. Transmissive projectors using an LCD for projection are substantially lighter with a higher resolution capacity than their CRT counterparts. The LCD panel used in projection TVs is very similar to that of a full sized LCD only smaller and brighter. This panel is backlit by a halogen lamp, the image on the panel is transmitted through a magnifying lens and projected onto a screen.
Reflective projectors use a small reflective chip to form the image. When light shines on this chip, it is reflected off of it, through a projection lens and onto the screen. The most exciting developments in projection TV technology have been made with reflective projectors using micro-electromechanical systems and liquid crystal on silicon.
With advances in LCD and MEM technologies, projectors will become smaller and form closer competition between projection TVs and the new plasma displays, in areas such as resolution and crispness of image detail. A relatively new application of projection TV technology is, "virtual reality", in which the viewer feels surrounded by, or as though he/she is a part of, the image being viewed. Projection TVs may not be the next big thing to hit the shelves, but we can be sure they will continue to be a viable, low priced option when shopping for your new TV.
Alan Rhinehart is an avid media and technology critic. He contributes to various online publications including "New Technology TV", a popular blog covering TV technology and home theater systems. Visit for more information on plasma TVs.