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Video Projector

Enlarge picture
Projected image from a video projector in a home cinema.


A video projector takes 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 widely used for conference room presentations, classroom training, and home theatre applications.

A video projector may also be built into a cabinet with a rear-projection screen (rear-projection TV, or RPTV) to form a single unified display device, now popular for “home theater” applications.

Common display resolutions for a portable projector include SVGA (800×600 pixels), XGA (1024×768 pixels), 720p (1280×720 pixels), and 1080p (1920×1080 pixels).

The cost of a device is not only determined by its resolution, but also by its light output, acoustic noise output, contrast, and other characteristics. While most modern projectors provide sufficient light for a small screen at night or under controlled lighting such as in a basement with no windows[1], a projector with a higher light output (measured in lumens, abbreviated “lm”) is required for a larger screen or a room with a higher amount of ambient light. A rating of 1000 to 1500 ANSI lumens or lower is suitable for smaller screens with controlled lighting or low ambient light.[1][2] Between 1500 and 3000 lm is suitable for medium-sized screens with some ambient light or dimmed light. Over 3000 lm is appropriate for very large screens in a large room with no lighting control (for example, a conference room). Projected image size is important; because the total amount of light does not change, as size increases, brightness decreases. Image sizes are typically measured in linear terms, diagonally, obscuring the fact that larger images require much more light (proportional to the image area, not just the length of a side). Increasing the diagonal measure of the image by 25 % reduces the image brightness by 35 per cent; an increase of 41 per cent reduces brightness by half.

Projection technologies

Obsolete technologies

See also

Major manufacturers

References

1. ^ Lumens guide. ProjectorPeople.com.
2. ^ Buying guide. TvSpecialists.com.
Video (Latin for "I see", first person singular present, indicative of videre, "to see") is the technology of electronically capturing, recording, processing, storing, transmitting, and reconstructing a sequence of still images representing scenes in motion.
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In telecommunication, signalling (UK spelling) or signaling (US spelling) has the following meanings:
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Projection screens are installations consisting of blank surface and a support structure used for displaying a projected image for the view of an audience. Projection screens may be permanently installed as in a movie theater, painted on the wall [1]
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lens (or lense) is an optical device with perfect or approximate axial symmetry which transmits and refracts light, concentrating or diverging the beam. A simple lens is a lens consisting of a single optical element.
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Home cinema, also called home theater, seeks to reproduce cinema quality video and audio in the home.

Technically, a home cinema could be as basic as a simple arrangement of a television, DVD, and a set of speakers.
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The display resolution of a digital television or computer display typically refers to the number of distinct pixels in each dimension that can be displayed. It can be an ambiguous term especially as the displayed resolution is controlled by different factors in cathode ray
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pixel (short for picture element, using the common abbreviation "pix" for "pictures") is a single point in a graphic image. Each such information element is not really a dot, nor a square, but an abstract sample.
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XGA, the eXtended Graphics Array, is an IBM display standard introduced in 1990. Today, it is the most common appellation of the 1024 × 768 pixels display resolution, but the official definition is broader than that.
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720p is the shorthand name for a category of HDTV video modes. The number 720 stands for 720 lines of vertical display resolution, while the letter p stands for progressive scan or non-interlaced.
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1080p is the shorthand name for a category of display resolutions. The number "1080" represents 1,080 lines of vertical resolution,[1] while the letter p stands for progressive scan (meaning the image is not interlaced). 1080p is considered an HDTV video mode.
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luminous flux or luminous power is the measure of the perceived power of light. It differs from radiant flux, the measure of the total power of light emitted, in that luminous flux is adjusted to reflect the varying sensitivity of the human eye to different wavelengths of
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For other uses of the word, see .


The lumen (symbol: lm) is the SI unit of luminous flux, a measure of the perceived power of light.
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American National Standards Institute or ANSI (IPA pronunciation: [ænsiː]) is a private nonprofit organization that oversees the development of voluntary consensus standards for products, services, processes,
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CRT projector is a video projector that uses a small, high-brightness CRT (or picture tube) as the image generating element. The image is then focused and enlarged onto a screen using a lens kept in front of the CRT face.
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1. Electron guns 2. Electron beams 3. Focusing coils 4. Deflection coils 5. Anode connection 6. Mask for separating beams for red, green, and blue part of displayed image 7.
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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 the modern equivalent of the slide projector or overhead projector.
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liquid crystal display (commonly abbreviated LCD) is a thin, flat display device made up of any number of color or monochrome pixels arrayed in front of a light source or reflector.
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For , see .


Digital Light Processing (DLP) is a technology used in projectors and video projectors. It was originally developed at Texas Instruments, in 1987 by Dr. Larry Hornbeck.
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Texas Instruments

Public (NYSE:  TXN )
Founded 1930 (as GSI), 1951 (as TI)[1]
Headquarters Dallas, Texas, USA

Key people Tom Engibous, Chairman
Rich Templeton, President & CEO
Kevin March, CFO
Brian Bonner, CIO
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For , see .


Digital Light Processing (DLP) is a technology used in projectors and video projectors. It was originally developed at Texas Instruments, in 1987 by Dr. Larry Hornbeck.
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Microfabrication is the collective term for the technologies used to fabricate components on a micrometer-sized scale.

Origins

Microfabrication technologies originate from the microelectronics industry, and the devices are usually made on silicon wafers even though glass,
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A Digital Micromirror Device, or DMD is an optical semiconductor that is the core of DLP projection technology, and was invented by Dr. Larry Hornbeck and Dr. William E. "Ed" Nelson of Texas Instruments (TI) in 1987.
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Liquid crystal on silicon (LCOS or LCoS) is a "micro-projection" or "micro-display" technology typically applied in projection televisions. It is a reflective technology similar to DLP projectors; however, it uses liquid crystals instead of individual mirrors.
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Liquid crystal on silicon (LCOS or LCoS) is a "micro-projection" or "micro-display" technology typically applied in projection televisions. It is a reflective technology similar to DLP projectors; however, it uses liquid crystals instead of individual mirrors.
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An Eidophor was a television projector used to create theatre-sized images. Its basic technology was the use of electrostatic charges to deform an oil surface.

Developed by the Swiss Federal Institute of Technology and Dr. Edgar Gretener A.G.
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The Schmidt-Cassegrain is a catadioptric telescope. It combines a folded optical path with a corrector plate to make a compact astronomical instrument.

Invention and Design

The Schmidt-Cassegrain is a design based on Bernhard Schmidt's Schmidt camera.
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Company founded by noted engineer Henry Kloss to develop and market high-performance video projection systems.

References


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Large-screen television technology developed rapidly in the late 1990s and 2000s. Various flat screen technologies are being developped, but only the liquid crystal display (LCD), plasma display (PDP) and Digital Light Processing (DLP) were released on the public market.
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Projectors are used for displaying an image on a projection screen or similar surface for the view of an audience.
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Projection screens are installations consisting of blank surface and a support structure used for displaying a projected image for the view of an audience. Projection screens may be permanently installed as in a movie theater, painted on the wall [1]
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