Transparency (projection)

transparenciestransparencyacetateOverhead transparency filmProjector transparenciessheets of transparent filmtransparencies (viewgraphs)transparency sheettransparency slidestransparent sheets
A transparency, also known variously as a viewfoil, foil, or viewgraph, is a thin sheet of transparent flexible material, typically cellulose acetate, onto which figures can be drawn.wikipedia
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Overhead projector

OHPoverheadoverhead projectors
These are then placed on an overhead projector for display to an audience. 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.
However some differences are necessitated by the much larger size of the transparencies used (generally the size of a printed page), and the requirement that the transparency be placed face up (and readable to the presenter).

Microsoft PowerPoint

PowerPointPPT.ppt
In recent years, more and more colleges are switching to digital projectors and PowerPoint presentations.
The earliest version of PowerPoint (1987 for Macintosh) could be used to print black and white pages to be photocopied onto sheets of transparent film for projection from overhead projectors, and to print speaker's notes and audience handouts; the next version (1988 for Macintosh, 1990 for Windows) was extended to also produce color 35mm slides by communicating a file over a modem to a Genigraphics imaging center with slides returned by overnight delivery for projection from slide projectors.

Spatial light modulator

spatial light modulatorsSLMsspacial light modulator
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.
A simple example is an overhead projector transparency.

Presentation slide

slideslidescolor 35mm slides
Presentation slide
Before the advent of the personal computer, a presentation slide could be a 35 mm slide viewed with a slide projector or a transparency viewed with an overhead projector.

Projection panel

Projection panel
The projection panel sits on the bed of the overhead projector, and acts like a piece of transparency.

Transparency and translucency

translucenttransparenttransparency
A transparency, also known variously as a viewfoil, foil, or viewgraph, is a thin sheet of transparent flexible material, typically cellulose acetate, onto which figures can be drawn.

Cellulose acetate

acetateCellonacetate microfilm
A transparency, also known variously as a viewfoil, foil, or viewgraph, is a thin sheet of transparent flexible material, typically cellulose acetate, onto which figures can be drawn.

Interactive whiteboard

interactive whiteboardselectronic whiteboardActivboards
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 video projectors and interactive whiteboards.

Laser printing

laser printerlaser printerslaser
Transparencies can be printed on laser printers or copiers.

Photocopier

photocopyingphotocopyphotocopied
Transparencies can be printed on laser printers or copiers.

Mathematics

mathematicalmathmathematician
Certain classes, such as those associated with mathematics or history and geography use transparencies to illustrate a point or problem.

History

historical recordshistoricalhistoric
Certain classes, such as those associated with mathematics or history and geography use transparencies to illustrate a point or problem.

Geography

geographicalgeographicgeographer
Certain classes, such as those associated with mathematics or history and geography use transparencies to illustrate a point or problem.

Secondary school

high schoolsecondaryhigh schools
This problem is typically limited to high school and college-level mathematics, because of the inclusion of algebra and calculus courses, respectively.

College

collegescollegiatePublic
This problem is typically limited to high school and college-level mathematics, because of the inclusion of algebra and calculus courses, respectively.

Algebra

algebraicAlgebra IAlgebra 1
This problem is typically limited to high school and college-level mathematics, because of the inclusion of algebra and calculus courses, respectively.

Calculus

infinitesimal calculusdifferential and integral calculusclassical calculus
This problem is typically limited to high school and college-level mathematics, because of the inclusion of algebra and calculus courses, respectively.

Video projector

projectorsdigital projectorprojector
In recent years, more and more colleges are switching to digital projectors and PowerPoint presentations. 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 video projectors and interactive whiteboards.

Boeing

The Boeing CompanyBoeing CompanyBoeing Aircraft Company
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.

Beechcraft

BeechBeech Aircraft CorporationBeech Aircraft
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.

Old Testament

Oldthe Old TestamentBiblical
Some 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.

Jews

JewishJewJewish people
Some 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.

Liquid-crystal display

LCDliquid crystal displayliquid crystal displays
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.

Digital Light Processing

DLPDigital light processorsdigital micro-mirrors
An LCD is a transmissive SLM, whereas other technologies such as Texas Instrument's DLP are reflective SLMs.

OLED

organic light-emitting diodeorganic light-emitting diodesOLEDs
An example of non-SLM system are organic light-emitting diodes (OLEDs).