LCD projectors tend to be smaller and more portable than some other types of projection systems. Even so, the best image quality is found using a blank white, grey, or black (which blocks reflected ambient light) surface, so dedicated projection screens are often used.
Perceived color in a projected image is a factor of both projection surface and projector quality. Since white is more of a neutral color, white surfaces are best suited for natural color tones; However, darkest black in a projected image is dependent on how dark the screen is. Because of this, some presenters and presentation space planners prefer gray screens, which create higher perceived contrast. The trade-off is that darker backgrounds can throw off color tones. Color problems can sometimes be adjusted through the projector settings, but may not be as accurate as they would on a white background.
Throw: A projector's throw ratio is used when installing projectors to control the size of the projected display. Throw is the distance of a projector from the screen. It is the distance the image is thrown onto the screen, and it has a large effect on screen size. Often in home theatre individuals lack the correct throw distance in the room which can be rectified by a short throw lens or long throw lenses.
A throw ratio refers to the ratio of the distance to the screen (throw) to the screen width. A larger throw ratio corresponds to a more tightly focused optical system.
Throw Ratio = D / W
For example, if the throw ratio is 2.0 and the projector is 14' away from the screen, then the display width will be 7'.
Last modified: Wednesday, 7 December 2011, 5:02 AM
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