Gain (projection screens)
- Gain (projection screens)
Gain is a property of a projection screen, defined by how much brightness is visible from the screen's centre when the viewer is looking at that point on-axis to the centre. Gain is controlled by diffusion of the screen, and governs the degree which light from the projector is scattered.
Further Meaning
A gain of 1.0 means the amount of light that is projected on the screen returns to the viewer at the same brightness: none is absorbed and all is re-radiated with perfect uniformity from all viewing angles. If one was to isolate certain rays striking the screen, he/she would see the rays diffuse to form a perfect hemisphere shape. A block of magnesium carbonate (MgCO3) or a matte white screen will result in a gain of 1.0.
But as gain increases, the shape of the hemisphere and hence the uniformity is affected. With increasing gain, the hemisphere radius would decrease along the surface of the screen, and the radius protruding perpendicular from screen will lengthen. The centre of the screen will become brighter and the edges of the screen will dim so uniformity decreases.
References
* [http://www.da-lite.com/education/angles_of_view.php?action=details&issueid=48 Da-Lite: Angles of View "Screen Gain - Whose Loss?"]
Wikimedia Foundation.
2010.
Look at other dictionaries:
Gain (disambiguation) — Gain may refer to: * Gain, an electronics and signal processing term * Gain (lasers), derivative of the logarithm of power with respect to length of propagation. * Gain (finance) * Gain (information retrieval) * Gain (novel), a novel by American… … Wikipedia
Projection screen — Home theater projection screen displaying a high definition television image 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… … Wikipedia
optics — /op tiks/, n. (used with a sing. v.) the branch of physical science that deals with the properties and phenomena of both visible and invisible light and with vision. [1605 15; < ML optica < Gk optiká, n. use of neut. pl. of OPTIKÓS; see OPTIC,… … Universalium
The Daily Show — Also known as The Daily Show with Jon Stewart Genre … Wikipedia
Digital Performance — is a very wide category filled with a range of productions, it is a generic performance but with an extra element of incorporating and integrating computer technologies and techniques into the production. [1] You can incorporate multimedia into… … Wikipedia
Late Show with David Letterman — Format Talk show Variety show Created by David Lette … Wikipedia
Fantasia (film) — Fantasia Theatrical release poster Directed by … Wikipedia
Museum of the Portuguese Language — The Museum of the Portuguese Language (Portuguese: Museu da Língua Portuguesa) is an interactive Portuguese language and Linguistics/Language Development in general museum in São Paulo, Brazil. It is housed in the Estação da Luz train station, in … Wikipedia
Baruch College — Coordinates: 40°44′25″N 73°59′00″W / 40.740159°N 73.98338°W / 40.740159; 73.98338 … Wikipedia
Glen Waverley Secondary College — Infobox Aust school name = Glen Waverley Secondary College | motto = Gain Wisdom established = 1960 type = Public School principal = Gerald Schillercite web url=http://www.study.vic.gov.au/school details.aspx?ID=8808 title=Glen Waverley Secondary … Wikipedia
