THE WHATIS.COM WORD-OF-THE-DAY July 18, 2002 digital projector ______________ TODAY'S SPONSOR: The .tv Corporation
Save 30% on Web addresses! Not only will you get a great deal on your Web addresses, but you'll also get superior customer service, innovative products and services and a place that is easy to register and manage your Web addresses. Great names are still available. Register the names you want before someone else does! Check it out now: http://WhatIs.com/r/0,,4516,00.htm?the.tvcorporation ______________ TODAY'S WORD: digital projector See our definition with hyperlinks at http://whatis.techtarget.com/definition/0,,sid9_gci839140,00.html 1) A digital projector, also called a digital projection display system, is a specialized computer display that projects an enlarged image on a movie screen. Such devices are commonly used in presentations. There are two main types of digital projection display systems. The older, less expensive type employs three transparent liquid-crystal-display (LCD) panels, one for each of the primary colors (red, green, and blue). The light transmittivity of each pixel varies depending on the image data received from the computer. The light from a lamp is directed through the LCD panels, collimated using a lens, and projected onto a screen. The overall construction of the device is similar to that of a slide projector, where the "slide" consists of the three LCD panels placed close together near the focal point of the projection lens. Advantages of LCD technology include efficiency, ease of brightness and contrast adjustment, and high image resolution. A newer, more expensive scheme is known as Digital Light Processing (DLP), a proprietary technology developed by Texas Instruments. In a DLP display, tiny mirrors are used instead of transparent panels. Each mirror represents one pixel. The light, rather than passing through the panel, is reflected from it. The mirrors move back and forth, varying the amount of light that reaches the projection lens from each pixel. Color is obtained by passing the light from the lamp through a rotating wheel with red, green, and blue filters. This subjects the mirrors to light at each of the primary colors in a rapid rotating sequence. The result is a color-modulated image that the human eye sees as natural color. Advantages of DLP technology include light weight, high contrast, and lack of pixelation. 2) The term digital projector is sometimes used for a program that facilitates the viewing of three-dimensional (3D), interactive, full-motion audio-visual files on a personal computer. Versions are available for both IBM-compatible and Macintosh computers, and can be downloaded from the Internet. They can be used as plug-ins for popular browsers for viewing animated Web-page content. For optimum performance on the Internet, a broadband connection should be used because of the high-speed, interactive nature of the content, and because the transmitted files are often large. RELATED TERMS: liquid-crystal-display http://whatis.techtarget.com/definition/0,,sid9_gci214075,00.html pixel http://whatis.techtarget.com/definition/0,,sid9_gci212793,00.html resolution http://whatis.techtarget.com/definition/0,,sid9_gci212895,00.html SELECTED LINKS: ExtremeTech discusses projection display technology. http://www.extremetech.com/article2/0,3973,10084,00.asp Projector Central provides consumer information about some projection display systems. http://www.projectorcentral.com/ Brilliant Digital offers a downloadable digital projector program. http://www.brilliantdigital.com/content.asp?ID=437 ______________________ WHATIS DISCUSSION FORUM | Challenge #8: Outbound mail failure Challenges are another learning tool where you (the reader) try to solve various real-life IT problems. 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Take our latest quiz and find out! http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci834253,00.html ______________________________ RECENT ADDITIONS AND UPDATES [1] Bohr radius http://whatis.techtarget.com/definition/0,,sid9_gci838634,00.html [2] Web Solution Platform http://searchwebmanagement.techtarget.com/sDefinition/0,,sid27_gci213905,00.html [3] megabytes per second http://searchstorage.techtarget.com/sDefinition/0,,sid5_gci838242,00.html [4] Categories of twisted pair cabling systems http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci211752_top1,00.html [5] Mbps http://whatis.techtarget.com/definition/0,,sid9_gci212534,00.html ____________________________________________________________________ ::::::::::::::::::: WHATIS.COM CONTACTS ::::::::::::::::::: LOWELL THING, Site Editor ([EMAIL PROTECTED]) ____________________________________________________________________ MARGARET ROUSE, Assistant Editor ([EMAIL PROTECTED]) ___________________________________________________________________ :::::::::::::::::::: ABOUT THIS NEWSLETTER ::::::::::::::::::::: Created by TechTarget (http://www.techtarget.com) TechTarget - The Most Targeted IT Media Copyright 2002, All Rights Reserved. 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