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Encyclopedia > Transparency (projection)
Overhead projector in operation, with a transparency being flashed.
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Overhead projector in operation, with a transparency being flashed.
For other uses of "Transparency", see Transparency (disambiguation).

A transparency is a thin sheet of transparent flexible material, typically celluloid, onto which figures can be drawn. These are then placed on an overhead projector for display to an audience. This system is still found in schools, but is being largely replaced by LCD projector. Image File history File linksMetadata Download high resolution version (2592x1944, 1869 KB) Summary Overhead projector, used during lessons in a classroom. ... Image File history File linksMetadata Download high resolution version (2592x1944, 1869 KB) Summary Overhead projector, used during lessons in a classroom. ... Wiktionary has related dictionary definitions, such as: transparency, transparent The root meaning of Transparency is a quality of certain materials which means that one can see through them. ... This article needs to be cleaned up to conform to a higher standard of quality. ... Celluloid is the name of a class of compounds created from nitrocellulose and camphor, plus dyes and other agents, generally regarded to be the first thermoplastic. ... An overhead projector is a display system that is used to display images to an audience. ... An LCD projector is a device utilized for displaying video images or data. ...


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. A LCD is a transmissive SLM, whereas other technologies such as Texas Instrument's DLP are reflective SLMs. Not all projectors (e.g. some use devices that produce their own light) rather than function as transparencies. An example of non-SLM system are OLEDs. An overhead projector is a display system that is used to display images to an audience. ... Reflective twisted nematic liquid crystal display. ... A spatial light modulator (SLM) is an object that imposes some form of spatially-varying modulation on a beam of light. ... Digital Light Processing (DLP) is a technology used in projectors and video projectors. ... An organic light-emitting diode (OLED) is a light-emitting diode (LED) made of semiconducting organic polymers. ...


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