Projector Wxga DLP
US $235.00
Viewsonic PJD6531w WXGA Wide DLP Projector Review
What type of Office Projector?
There are three types of projector technologies available on the market. DLP (Digital Light Processing) and LCD (Liquid Crystal Display) are the most widely available technologies, whilst LCoS (Liquid Crystal on Silicon) is a more recent technology that is becoming more popular.
DLP and LCD have few differences. DLP projectors are subject to the ‘rainbow effect’. This is due to the colour wheel they use to generate an image. This effect means that a very small amount of people will see flashes of solid colour. Faster colour wheels have reduced this substantially. DLP projectors can be a little awkward about where they are placed relative to the screen. LCD projectors are easier to place but also come with their own difficulties. LCD can suffer from ‘screen door effect’, the images sometimes look as though you are looking through a mesh panel. Experts tend to prefer DLP projectors as the black levels and contrast give a better cinematic picture but LCD projectors have a small price advantage.
The other type of Office Projector is LCoS. This is a newer technology than either DLP or LCD and is becoming increasingly popular. The LCoS technology has neither ‘rainbow effect’ nor ‘screen door effect’ and gives outstanding picture quality. However, it does tend to be more expensive than either DLP or LCD.
Another thing to look at is the resolution of the digital projector. SVGA (800p x 600p) and XGA (1024p x 768p) are the most popular. The XGA gives better, sharper text and graphics. SVGA is still available and cheaper than XGA and would give perfectly adequate pictures for the usual PowerPoint presentation. With the increase in wide screen laptops, the resolutions that fit them have changed. WVGA resolution (854p x 480p) matches that of DVD movies. There are other resolutions of similar size that come under the umbrella of WVGA. Many widescreen business projectors have WXGA resolution that matches many 14-15inch laptops. SXGA+ matches the larger computer screens and laptops over 17 inches.
Brightness is measured in lumens and basically, the larger the room the more lumens are required. Contrast ratio for most graphics and text is fine at 400:1 but for movies needs to be more than 1000:1.
Lamps can be quite expensive and they do need to be replaced periodically. Not surprisingly the lamps are rarely covered under the warranty for more than 90 days.
Portability of your Office Projector is something to be considered. Projectors generally weigh about 2-3 pounds but can go up to around 10 pounds.
About the Author
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Tom Jacobsen is a writer for www.zenostore.co.uk and has worked in the electronics industry for many years.
Is buying a projector a smart choice?
Can someone please help with advice on buying a projector?
Is there a better brand (model) than the rest?... Or are ALL brands much the same?
What is the dif between SVGA, XGA, WXGA? DLP or LCD tech?
Best choice and specs I should be looking for?
Apart from TV viewing, I want to use it for pc gaming.
Are projectors a good choice for gaming?
Can projectors be left turned on for long periods of time?...
Say for days on end?
When purchasing projector, are there certain brands or specs I should stay well away from?
Unsure of what to buy to get quality TV viewing and PC gaming???
How many hrs (life) should I get out of a new model projector?
What are the pros & cons?
Thanks for your help and time. 
It would take a book to answer all your questions.
See the sites at the links for most of what you need to know.
Every projector is a bit different. You must start with your needs/preferences in mind. Costs vary form a few $hundred to many $thousand ... although a reasonable image can be had on a $600+ projector.
Higher resolution (e.g. 720p, 1080p) is better, but costs more. VGA and XGA, etc are business projector resolution designations. If you want for home theater use you want to get 720p or 1080p.
Contrast ratio is king ... get at least 2000:1 ... but more is better (BUT, see 2nd link). Other key considerations include colour accuracy, video processing quality, inputs, fan noise, basic technology (DLP, LCD or LCoS). See 1st link for input.
Projectors can be left on, but lamps wear out (~3000 hrs of life) and cost a lot ($300+) to replace (See 3rd link for how to protect lamps)
There are many good brands ... see reviews at the first link.
A projector is by far the best way to get a BIG picture (90"+), but lamps need to be replaced, the room should be dark (or at least dim), and you need a screen (can cost $thousands, but you can make your own for $100 ... see 4th link).
The screen size needs to be matched to the room dimensions/viewing distance (See last link).
There ... a course in a few paragraphs .... now go and do the reading before even thinking about buying. Good Luck!
