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2. Gain (projection screens) - Wikipedia

   en.wikipedia.org/wiki/Gain_(projection_screens)

   Screens with a higher brightness than this standard are rated with a gain higher than 1.0, while screens with lower brightness are rated from 0.0 to 1.0. Since a projection screen is designed to scatter the impinging light back to the viewers, the scattering can be highly diffuse or highly concentrated.

3. Viewing angle - Wikipedia

   en.wikipedia.org/wiki/Viewing_angle

   For example, some projection screens reflect more light perpendicular to the screen and less light to the sides, making the screen appear much darker (and sometimes colors distorted) if the viewer is not in front of the screen. Many manufacturers of projection screens thus define the viewing angle as the angle at which the luminance of the ...

4. Projection screen - Wikipedia

   en.wikipedia.org/wiki/Projection_screen

   A projection screen is an installation consisting of a surface and a ... Semi-specular high gain screen materials are suited to ceiling-mounted projector setups since ...

5. Projector - Wikipedia

   en.wikipedia.org/wiki/Projector

   A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent lens, but some newer types of projectors can project the image directly, by using lasers. A virtual retinal display, or retinal ...

6. Silver screen - Wikipedia

   en.wikipedia.org/wiki/Silver_screen

   Similar to a silver screen, but using aluminium to coat the surface. Used for 3D films for the same reason as silver screens. Pearlescent screen; Similar to a silver screen, this screen has narrow viewing angles and a higher gain (the measure of reflected light), but it does suffer from color-shifts to red and a tendency to hot spot. Glass ...

7. Movie projector - Wikipedia

   en.wikipedia.org/wiki/Movie_projector

   Simulation of a spinning zoopraxiscope An early projector and seats from a movie theater. The main precursor to the movie projector was the magic lantern.In its most common setup it had a concave mirror behind a light source to help direct as much light as possible through a painted glass picture slide and a lens, out of the lantern onto a screen.