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Projected image from a video projector in a "home cinema.

A video projector is an "image projector that receives a "video "signal and projects the corresponding image on a "projection screen using a "lens system. All video projectors use a very bright light to project the image, and most modern ones can correct any curves, blurriness, and other inconsistencies through manual settings.

Video projectors are used for many applications such as conference room presentations, classroom training, "home cinema and "concerts. In schools and other educational settings,[1] they are sometimes connected to an "interactive whiteboard. In the late 20th century they became commonplace in "home cinema. Although large "LCD television screens became quite popular, video projectors are still common among many home theater enthusiasts.

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Overview[edit]

A video projector, also known as a digital projector, may project onto a traditional reflective projection screen, or it may be built into a cabinet with a translucent "rear-projection screen to form a single unified display device.

Common "display resolutions for contemporary (as of 2012) portable projectors include "SVGA (800×600 "pixels), "XGA (1024×768 pixels), "720p (1280×720 pixels), and "1080p (1920×1080 pixels).

The cost of a device is determined by its resolution and its light output. A projector with a higher "light output (measured in "lumens, “lm”) is required for a larger screen or for a room with a larger amount of ambient light.[2] For example, a light output of approximately 1500 to 2500 "ANSI lumens is suitable for small screens viewed in rooms with low ambient light; approximately 2500 to 4000 lm is suitable for medium-sized screens with some ambient light; over 4000 lm is needed for very large screens or for use in rooms with no lighting control such as conference rooms.

A few "camcorders have a "built-in projector suitable to make a small projection; a few more powerful "pico projectors" are pocket-sized, and many projectors are portable.

Projection technologies[edit]

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A "Zenith 1200 CRT Projector based "home theater, ca. 2006.

Obsolete technologies[edit]

Do-it-yourself video projectors[edit]

Some "hobbyists build a do-it-yourself ("DIY) projector for "low cost. They build their projectors from kits, sourced components, or from scratch, using a television set as a light source. Through the internet, they obtain plans to construct them[4] for domestic and "classroom use.

See also[edit]

References[edit]

  1. ^ Charles Proctor (January 18, 2007). "Christmas is a time for taking -- from schools". "Los Angeles Times. Retrieved 2010-11-26. 
  2. ^ Richard Cadena (2006). Automated Lighting: The Art and Science of Moving Light in Theatre, Live Performance, Broadcast, and Entertainment. "Focal Press. p. 344. "ISBN "978-0-240-80703-4. 
  3. ^ Kaczorowski, A., Gordon, G.S.D., Palani, A., Czerniawski, S. and Wilkinson, T.D. (2015) “Optimization-Based Adaptive Optical Correction for Holographic Projectors”, IEEE/OSA Journal of Display Technology, 11 (7).
  4. ^ Frank Völkel (November 13, 2004). "Supersize Your TV for $300: Build Your Own XGA Projector!". "Tom's Hardware. Retrieved 2010-11-26. 
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