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A projection screen is an installation consisting of a surface and a support structure used for displaying a projected image for the view of an audience.
Projection screens may be permanently installed, as in a movie theater; or semi-permanent or mobile as in a conference room or other non-dedicated viewing space such as an outdoor movie screening.
Uniformly white or grey screens are used almost exclusively as to avoid any discoloration to the image, while the most desired brightness of the screen depends on a number of variables, such as the ambient light level and the luminous power of the image source.
Flat or curved screens may be used depending on the need of the application (flat screens being the more common of the two). Screens can be further designed for front or back projection, the more common being front projection systems, which have the image source situated on the same side of the screen as the audience.