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Ruby also absorbs some of the light at its lasing wavelength. To overcome this absorption, the entire length of the rod needs to be pumped, leaving no shaded areas near the mountings. The active part of the ruby is the dopant, which consists of chromium ions suspended in a synthetic sapphire crystal. The dopant often comprises around only 0.05% ...
Local dimming on light-emitting screens for improved image uniformity in scanning beam display systems. By Roger A. Hajjar. December 22, 2015. [33] Composite and other phosphor materials for emitting visible light and applications in generation of visible light including light-emitting screens. By Roger A. Hajjar, David Kent, Phillip Malyak.
Electric screens are similar to pull-down screens, but instead of the screen being pulled down manually, an electric motor raises and lowers the screen. Electric screens are usually raised or lowered using either a remote control or wall-mounted switch, although some projectors are equipped with an interface that connects to the screen and ...
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 ...
An LCD projector is a type of video projector for displaying video, images or computer data on a screen or other flat surface. It is a modern equivalent of the slide projector or overhead projector .
Original Cinerama screen in the Bellevue Cinerama, Amsterdam (1965–2005) 17-meter curved screen removed in 1978 for 15-meter normal screen. [1]Cinerama is a widescreen process that originally projected images simultaneously from three synchronized 35mm projectors onto a huge, deeply curved screen, subtending 146-degrees of arc.
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