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How do DLP Cinema Projectors Work?

DLP Cinema systems have been deployed and tested commercially in theatres since 1999. In June 1999, Star Wars: Episode I – The Phantom Menace was the first movie to be entirely scanned and distributed to theaters. Four theaters installed digital projectors for the...

How do Xenon Arc Projector Lamps Work?

For xenon arc lamps, during start-up, the lamp is ignited by a 5–20-kilovolt pulse from a current-regulating ballast to initiate an arc between two electrodes in the quartz tube. After warmup, the ballast's output voltage drops to approximately 60 volts while keeping...

How Do 3 Chip DLP Projectors Work?

A three-chip DLP projector uses a prism to split light from the lamp, and each primary color of light is then routed to its own DLP chip, then recombined and routed out through the lens. Three chip systems are found in higher-end home theater projectors, large venue...

How does a Single DLP Chip Projector Work?

In a projector with a single DLP chip, colors are produced either by placing a color wheel between a white lamp and the DLP chip or by using individual light sources to produce the primary colors, LEDs or lasers for example. The color wheel is divided into multiple...

What is a Digital Micromirror Device (DMD)?

In DLP projectors, the image is created by microscopically small mirrors laid out in a matrix on a semiconductor chip, known as a Digital Micromirror Device (DMD). These mirrors are so small that DMD pixel pitch may be 5.4 µm or less. Each mirror represents one or...

What is a Projector Throw Ratio?

A projector's throw ratio is used when installing projectors to control the size of the projected display. For example, if the throw ratio is 2:1 and the projector is fourteen feet away from the screen, then the display width will be seven feet.

History of LCD Projectors

Early experiments with liquid crystals to generate a video image were done by John A. van Raalte at the RCA-Laboratories in 1968.[3] His concept was based on e-beam-addressing to generate an electronic charge pattern corresponding to a video image, which in turn...

What is an LCD Projector?

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. To display images, LCD (liquid-crystal display) projectors typically...

Video Projection Technologies

LCD projector using LCD light gates. This is the simplest system, making it one of the most common and affordable for home theaters and business use. Common problems include a visible “screen door” or pixelation effect,, and the LCD panels deteriorating from heat...

What is a Video Projector?

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 or laser to project the image, and most modern ones can correct any...

Different Types of Projectors

Projectors can be roughly divided into three categories, based on the type of input. Some of the listed projectors were capable of projecting different types of input. For instance: video projectors were basically developed for the projection of prerecorded moving...

What is a Projector?

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...