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2. Projection screen - Wikipedia

   en.wikipedia.org/wiki/Projection_screen

   Switchable projection screens can be switched between opaque and clear. In the opaque state, projected image on the screen can be viewed from both sides. It is very good for advertising on store windows. Inflatable movie screen. Mobile screens usually use either a pull-down screen on a free stand, or pull up from a weighted base.

3. Rear-projection television - Wikipedia

   en.wikipedia.org/wiki/Rear-projection_television

   A projection television uses a projector to create a small image or video from a video signal and magnify this image onto a viewable screen. The projector uses a bright beam of light and a lens system to project the image to a much larger size. A front-projection television uses a projector that is separate from the screen and the projector is ...

4. Negative pulldown - Wikipedia

   en.wikipedia.org/wiki/Negative_pulldown

   The majority of 35 mm film systems, cameras, telecine equipment, optical printers, or projectors, are configured to accommodate the 4-perf system; each frame of 35 mm is 4 perforations long. 4-perf was (and remains) the traditional system, and the majority of projectors are based on 4-perf, because 4 perforations is the amount needed per frame vertically in order to have enough negative space ...

5. Television - Wikipedia

   en.wikipedia.org/wiki/Television

   DLP technology is used in DLP front projectors (standalone projection units for classrooms and businesses primarily) but also in private homes; in these cases, the image is projected onto a projection screen. DLP is also used in DLP rear projection television sets and digital signs. It is also used in about 85% of digital cinema projection. [206]

6. Large-screen television technology - Wikipedia

   en.wikipedia.org/wiki/Large-screen_television...

   A 140 cm (56 in) DLP rear-projection TV Large-screen television technology (colloquially big-screen TV) developed rapidly in the late 1990s and 2000s.Prior to the development of thin-screen technologies, rear-projection television was standard for larger displays, and jumbotron, a non-projection video display technology, was used at stadiums and concerts.

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 ...