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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. 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 ...

4. 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 ...

5. 73 Brands That Are Still Made Right Here in the USA - AOL

   www.aol.com/73-brands-still-made-usa-123000180.html

   Chesapeake Bay Candle factory workers make more than a half-million scented candles each month for sale at ... and overhead projectors, and the facilities have expanded to focus on the adhesive ...

6. These Top-Rated Projectors Are Up to 50% off For Prime Day - AOL

   www.aol.com/entertainment/bestselling-projectors...

   It’s a foregone conclusion that Amazon is a great source if you’re looking to score a new projector for outdoor movie nights, work presentations or just a TV replacement altogether. Of course ...

7. 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.