Buying Guide to Projectors & Projector Screens


The two main terms you will hear are DLP and LCD

Digital Light Processing (DLP)

DLP projectors shine light onto chip with microscopic mirrors. The light source can last as long as 60,000 hours, and you can use it almost continuously without losing image quality. The projector lamp does burn hot however, and must be cooled down to get is full lifespan.

Liquid Crystal Display (LCD)

LCD Crystals have tiny crystals embedded in the screen which glow red, green or blue when hit by an electrical charge. LCD projectors work best for shorter usages, a few hours per day. Many LCD lamps are rated at 2,000 hours use, but proper cool-down can extend that life expectancy considerably.


ANSI Lumens: Industry standard measurement of a projector’s brightness. Depending on lamp, optics and projector design, ANSI lumens on projectors range from 1500 to 3000.

Contrast Ratio: The contrast between the brightest white and the darkest black. Higher contrast ratios offer brigher colours and better details. You’ll want to choose a contrast ratio of at least 1000 to 1.

Image Size: The size of a projected image, usually measured diagonally.

Keystone Correction: Keystone correction makes a projected image rectangular. Since this is not always possible, most projectors are equipped with keystone correction that allows the image to be keystone corrected (made rectangular) by adjusting optics, making mechanical adjustments or applying digital correction to the image.

Resolution: The number of screen pixels that can be displayed by the projector. Higher resolution models are useful if you need to project more of a screen, such as a full layout of a document or drawing.

Throw Distance: This is also known as projection distance. The distance from the projector to screen. This is not the distance you may want to throw the projector if you are having trouble with it!

Video Standards: The type of video inputs an LCD projector can accept. Leading standards include NTSC, SECAM and PAL with PAL being the UK video standard.


If you are buying a projector, you will need t know about projection screens:

These are some of the things to consider:

It is essential that you get the screen that is fit for the purpose. The key question is whether you will need to move this screen or will it be fixed in one location. There are several types of screens available to choose from:

Desktop Screens: These are lightweight screens, ideal for the travellng presenter. They are foldable so that they can be moved from location to location and assembled with ease.

Floor Standing Screens: Made with a lightweight construction they are perfect if you have limited wall space or you want to move the screen between rooms.

Wall Screens: Ideal when a permanent fixed screen is required. These are mounted to the wall and retract into the screen casing when not required.

Electric Screens: Ideal for the corporate office and home cinema installations, they provide hassle-free projection. They have a simple wall mounted switch , or you can use a remote control enabling you to raise and lower the screen when needed.