Resolution
The sharpness and clarity of the picture on the screen is determined by a projector's resolution. Resolution refers to the sharpness of the image projected, as expressed in pixels (the higher, the better). When it comes to projectors however, the thing you want to pay attention to is the "Native Resolution." This refers to the true resolution (i.e. non-compressed, non-expanded) of the projector. Ultimately, you want a projector that matches the resolution of your computer exactly; if an exact match is not available, then choose the level that is slightly higher than the resolution of your system. (If you plan on using the projector with many different computers, then you want a projector with a native resolution that is as high as the highest resolution of all the units). Most projectors today support resolutions that are higher than their native resolution by compressing the number of pixels. However, much of the quality and detail of the projected image is lost when this happens. Do not be misguided by the maximum resolution capability of the projector; instead, just focus on what the native (true) resolution is. Resolution of projectors is differentiated in four categories.
- VGA (640x480)
- SVGA (800x600)
- XGA (1024x768)
- SXGA (1280x1024)
- UXGA (1600x1200)
- SVGA, or "800 x 600" – This is a popular resolution today, because most notebook computers are SVGA. Matching the projector resolution with the computer resolution will produce the best results.
- XGA, or "1,024 x 768" - XGA projectors are generally more expensive, and are the second most popular resolution format. Many of the newest products are coming out in XGA. They are getting more popular as prices drop and the use of XGA notebook computers increases.
- SXGA, or "1,280 x 1,024" – SXGA products are high resolution, and notably more expensive than XGA. These products are targeted for high end personal computer users and low end workstation users. They are used primarily for command and control, engineering and CAD/CAM applications where acute resolution of small details is important.
- UXGA, or "1,600 x 1,200" – UXGA is for very high resolution workstation applications that are detail or information intensive. These are expensive projectors that support a broad range of computer equipment. Relatively few products on the market have this native resolution.
Aspect ratio
The most popular aspect ratio is 4:3 (4 by 3). Early television and computer video formats are in a 4:3 aspect ratio, which means that the width of the image is 4/3 times the height. Examples: A 15 inch monitor is 12 inches wide by 9 inches high (9 x 4/3 = 12). A resolution of 640x480 is a 4:3 format (480 x 4/3 = 640). Other formats are 5:4 used by the 1280x1024 SXGA resolution, 16:9 is used by HDTV, and 3:2 for 35mm slides.
It is important to think about weight of projector as it might effect you if you are carrying your projector too much, so it is good to have a projector with a weight in a range of 2 to 3kg.
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