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2. Overhead projector - Wikipedia

   en.wikipedia.org/wiki/Overhead_projector

   Overhead projector. An overhead projector (often abbreviated to OHP ), like a film or slide projector, uses light to project an enlarged image on a screen, allowing the view of a small document or picture to be shared with a large audience. In the overhead projector, the source of the image is a page-sized sheet of transparent plastic film ...

3. Rear-projection television - Wikipedia

   en.wikipedia.org/wiki/Rear-projection_television

   Rear-projection television ( RPTV) is a type of large-screen television display technology. Until approximately 2006, most of the relatively affordable consumer large screen TVs up to 100 in (250 cm) used rear-projection technology. A variation is a video projector, using similar technology, which projects onto a screen .

4. Arc lamp - Wikipedia

   en.wikipedia.org/wiki/Arc_lamp

   An arc lamp or arc light is a lamp that produces light by an electric arc (also called a voltaic arc). The carbon arc light, which consists of an arc between carbon electrodes in air, invented by Humphry Davy in the first decade of the 1800s, was the first practical electric light. [ 1][ 2] It was widely used starting in the 1870s for street ...

5. I tried the Bomaker Polaris 4K projector — and it's a ...

   www.aol.com/entertainment/tried-bomaker-polaris...

   However, there's a deal right now that makes it more appealing: For a limited time, Walmart seller Sustanbo has the Bomaker Polaris ultra short throw 4K projector for $1,800, one of the best deals ...

6. Should You Buy a Samsung Frame TV or a Laser Projector? - AOL

   www.aol.com/lifestyle/buy-samsung-frame-tv-laser...

   The future of entertainment viewing is here. People are asking, should they buy the Samsung Frame TV or a laser projector? We did the editor research. Read our full review here.

7. Opaque projector - Wikipedia

   en.wikipedia.org/wiki/Opaque_projector

   Opaque projector. An episcope which was used in a University of Cambridge lecture hall in the late 1800s. The opaque projector, or episcope is a device which displays opaque materials by shining a bright lamp onto the object from above. The episcope must be distinguished from the diascope, which is a projector used for projecting images of ...