Transparency (projection)

Transparency (projection) - Wikipedia, the free encyclopedia a.new,#quickbar a.new{color:#ba0000} /* cache key: enwiki:resourceloader:filter:minify-css:4:f2a9127573a22335c2a9102b208c73e7 */ if ( window.mediaWiki ) { mw.config.set({"wgCanonicalNamespace": "", "wgCanonicalSpecialPageName": false, "wgNamespaceNumber": 0, "wgPageName": "Transparency_(projection)", "wgTitle": "Transparency (projection)", "wgCurRevisionId": 448837667, "wgArticleId": 351080, "wgIsArticle": true, "wgAction": "view", "wgUserName": null, "wgUserGroups": ["*"], "wgCategories": ["Articles lacking sources from December 2009", "All articles lacking sources", "Display technology", "Technology stubs"], "wgBreakFrames": false, "wgRestrictionEdit": [], "wgRestrictionMove": [], "wgSearchNamespaces": [0], "wgFlaggedRevsParams": {"tags": {"status": {"levels": 1, "quality": 2, "pristine": 3}}}, "wgStableRevisionId": null, "wgVectorEnabledModules": {"collapsiblenav": true, "collapsibletabs": true, "editwarning": true, "expandablesearch": false, "footercleanup": false, "sectioneditlinks": false, "simplesearch": true, "experiments": true}, "wgWikiEditorEnabledModules": {"toolbar": true, "dialogs": true, "hidesig": true, "templateEditor": false, "templates": false, "preview": false, "previewDialog": false, "publish": false, "toc": false}, "wgTrackingToken": "5f99f23873cae27490cab89b975c1a77", "wikilove-recipient": "", "wikilove-edittoken": "+\\", "wikilove-anon": 0, "mbEditToken": "+\\", "Geo": {"city": "", "country": ""}, "wgNoticeProject": "wikipedia"}); } if ( window.mediaWiki ) { mw.loader.load(["mediawiki.page.startup"]); } Transparency (projection) From Wikipedia, the free encyclopedia Jump to: navigation, search This article does not cite any references or sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (December 2009) Overhead projector in operation, with a transparency being flashed. A transparency, also known in industrial settings as a "viewfoil" or "foil", is a thin sheet of transparent flexible material, typically cellulose acetate, onto which figures can be drawn. These are then placed on an overhead projector for display to an audience. Many companies and small organizations use a system of projectors and transparencies in meetings and other groupings of people, though this system is being largely replaced by LCD projectors and interactive whiteboards. Creation of transparencies Transparencies can be created in one of two ways. First, a laser printer can be connected to a computer, which is loaded with a cartridge of celulose acetate sheets. An image or document is then created within the computer, though images are prevalent due to text being illegible at certain distances f rom a projection, and then formatted to be printed. From there, the printer is engaged and the document printed onto the sheet of acetate. Some people prefer to test the transparency before sending it out to the person requesting it. Secondly, some black and white or color copiers are able to print onto, or can be configured to handle, acetate sheets. These are usually toner-based copying machines, as inkjet-based technology is not yet capable of printing on acetate sheets. A person may place a document or a book on the surface of the copying machine and make one or several copies onto acetate, if there are simultaneous meetings or if another company or organization wants a copy. Uses for transparencies Uses for transparencies are as varied as the organizations that use them. Certain classes, such as those associated with Mathematics or History, used transparencies to illustrate a point or problem. Math classes in particular use a roll of acetate to illustrate sufficiently long problems and to create illustrations a computer cannot, due to a lack of math symbols on a standard computer keyboard. This problem is typically limited to High School and College-level mathematics, because of the inclusion of Algebra and Calculus courses, respectively. In recent years, more and more colleges are switching to digital projectors and Powerpoint presentations. Aerospace companies, like Boeing and Beechcraft, used transparencies for years in management meetings in order to brief engineers and relevant personnel about new aircraft designs and changes to existing designs, as well as bring up illustrated problems.1 More tech-friendly churches and other religious organizations used them to show sermon outlines and illustrate certain topics such as Old Testament battles and Jewish artifacts during worship services, as well as outline business meetings. Spatial light modulators (SLMs) Many overhead projectors are used with a flat panel LCD which, when used this way is referred to as a spatial light modulator or SLM. Data projectors are often based on some form of SLM in a projection path. An LCD is a transmissive SLM, whereas other technologies such as Texas Instrument's DLP are reflective SLMs. Not all projectors use SLMs (e.g., some use devices that produce their own light rather than function as transparencies). An example of non-SLM system are OLEDs. v · d · eDisplay technology Video displays Current generation Eidophor · Electroluminescent display (ELD) · Vacuum fluorescent display (VFD) · Light emitting diode display (LED) · Cathode ray tube (CRT) (Monoscope) · Liquid crystal display (LCD) (TFT · LED · Blue Phase) · Plasma display panel (PDP) (ALiS) · Digital light processing (DLP) · Liquid crystal on silicon (LCoS) Next generation Organic light-emitting diode (OLED) · Organic light-emitting transistor (OLET) · Surface-conduction electron-emitter display (SED) · Field emission display (FED) · Laser TV (Quantum dot · Liquid crystal) · MEMS display (iMoD · TMOS · DMS) · Quantum dot display (QD-LED) · Ferro liquid display (FLD) · Thick-film dielectric electroluminescent (TDEL) · Telescopic pixel display (TPD) · Laser phosphor display (LPD) Non-video Electromechanical (Flip-dot · Split-flap · Vane) · Electronic paper · Rollable · Eggcrate · Nixie tube · Light-emitting electrochemical cell (LEC) 3D display Stereoscopic · Autostereoscopic · Multiscopic · Hologram (Holographic display · Computer-generated holography) · Volumetric (Swept-volume) · Free-space · Multi-layer Static media Movie projector · Neon sign · Rollsign · Slide projector · Transparency · Laser beam Related articles Display examples · Large-screen television technology · Optimum HDTV viewing distance · High dynamic range imaging (HDRI) Comparison of display technology This technology-related article is a stub. You can help Wikipedia by expanding it.v · d · e ^ Serling, Robert J. (1992). Legend and Legacy: The Story of Boeing and It's People. St. Martin's Press. pp. 449. ISBN 0-312-05890-X.