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2. Projection screen - Wikipedia

   en.wikipedia.org/wiki/Projection_screen

   Projection screens may be permanently installed on a wall, as in a movie theater, mounted to or placed in a ceiling using a rollable projection surface that retracts into a casing (these can be motorized or manually operated), painted on a wall, [1] or portable with tripod or floor rising models as in a conference room or other non-dedicated ...

3. Theater drapes and stage curtains - Wikipedia

   en.wikipedia.org/wiki/Theater_drapes_and_stage...

   The rear stage wall may be obscured by a traveler, if a cyclorama or projection screen is not in place. Tabs , also known as up-and-downers (UK) or Germans , are drapes hung perpendicular to the proscenium and at the sides, used to more completely mask the wings than legs.

4. Cinerama - Wikipedia

   en.wikipedia.org/wiki/Cinerama

   The Cinerama projection screen, rather than being a continuous surface like most screens, is made of hundreds of individual vertical strips of standard perforated screen material, each about 7 ⁄ 8 inch (~22 millimeters) wide, with each strip angled to face the audience, to prevent light scattered from one end of the deeply curved screen from ...

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. Viewing angle - Wikipedia

   en.wikipedia.org/wiki/Viewing_angle

   Many manufacturers of projection screens thus define the viewing angle as the angle at which the luminance of the image is exactly half of the maximum. With LCD screens, some manufacturers have opted to measure the contrast ratio and report the viewing angle as the angle where the contrast ratio exceeds 5:1 or 10:1, giving minimally acceptable ...

7. Overhead projector - Wikipedia

   en.wikipedia.org/wiki/Overhead_projector

   An overhead projector works on the same principle as a slide projector, in which a focusing lens projects light from an illuminated slide onto a projection screen where a real image is formed. However some differences are necessitated by the much larger size of the transparencies used (generally the size of a printed page), and the requirement ...