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2. Overhead projector - Wikipedia

   en.wikipedia.org/wiki/Overhead_projector

   In the early 1980s–1990s, overhead projectors were used as part of a classroom computer display/projection system. A liquid-crystal panel mounted in a plastic frame was placed on top of the overhead projector and connected to the video output of the computer, often splitting off the normal monitor output.

3. Transparency (projection) - Wikipedia

   en.wikipedia.org/wiki/Transparency_(projection)

   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 ...

4. VEB Polytechnik - Wikipedia

   en.wikipedia.org/wiki/VEB_Polytechnik

   Overhead projector "Polylux" Microcomputer teaching kit "Poly-Computer 880" VEB Polytechnik was a company from the German Democratic Republic (GDR) located in Chemnitz (then called Karl-Marx-Stadt). In the GDR, it was mainly known for producing overhead projectors, called Polylux.

5. Things Boomers Took for Granted That are Obsolete Now

   www.aol.com/things-boomers-took-granted-obsolete...

   Overhead Projectors. ... Do you want to use the phone or the computer? At the dawn of the internet age in the 1990s, this was the decision you would have faced if you wanted to get online. Then ...

6. Document camera - Wikipedia

   en.wikipedia.org/wiki/Document_camera

   The widespread use of computers, projectors, and popular presentation programs such as Microsoft PowerPoint in meeting rooms led to overhead projectors being used less frequently. [citation needed] Early prototypes were simple video cameras mounted on a copy-stands.

7. Projection panel - Wikipedia

   en.wikipedia.org/wiki/Projection_panel

   It works with an overhead projector. The panel consists of a translucent LCD, and a fan to keep it cool. The projection panel sits on the bed of the overhead projector, and acts like a piece of transparency. The panels have a VGA input, and sometimes Composite (RCA) and S-Video input. Later models have remotes, with functions such as 'freeze ...