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LCD projectors are the modern equivalent of the slide and overhead projector. LCD projectors use a small and usually colored LCD panel placed before a bright lamp, with the images on the screen provided by sources such as a DVD, VCR or a computer. LCD projectors are generally smaller in size and more easily transportable than former systems. Armed with a lens capable of projecting the images on any surface with a flat plane and not requiring supporting furniture like a big-sized television would, LCD projectors are getting increasingly viable with each passing day. There are certain things to take into account when purchasing an LCD projector. The projector's resolution generally determines the price; the higher the resolution, the greater the price. If the need is for minute details to be precisely displayed, then higher resolution projectors are the way to go. The LCD projector's light output depends on the lumens rating, i.e. the higher the lumens rating the brighter the light output. For classrooms, projectors of 1000-2000 lumens suffice; for big conference rooms, the ideal projectors would be those between 2000-3000 lumens. The ratio between the brightest and darkest spots of an image is called the projector contrast. When purchasing LCD projectors, it is feasible to go for contrasts of 400:1 or higher. This way the best and the clearest pictures are achieved.
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