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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. LCD projector - Wikipedia

   en.wikipedia.org/wiki/LCD_projector

   LCD projector. An LCD projector is a type of video projector for displaying video, images or computer data on a screen or other flat surface. It is a modern equivalent of the slide projector or overhead projector. To display images, LCD ( liquid-crystal display) projectors typically send light from a metal-halide lamp through a prism or series ...

5. Ultra-high-performance lamp - Wikipedia

   en.wikipedia.org/wiki/Ultra-high-performance_lamp

   An ultra-high-performance lamp, often known by the Philips trademark UHP, is a high-pressure mercury arc lamp. [1] These were originally known as ultra-high-pressure lamps, [2] [3] because the internal pressure can rise to as much as 200 atmospheres when the lamp reaches its operating temperature. It was developed by Philips in 1995 for use in ...

6. Jumbotron - Wikipedia

   en.wikipedia.org/wiki/Jumbotron

   A jumbotron, [ 1] sometimes referred to as jumbovision, is a video display using large-screen television technology ( video wall ). The original technology was developed in the early 1980s by Mitsubishi Electric [ 2] and Sony, which coined JumboTron as a brand name in 1985. [ 3] Mitsubishi Electric sold their version of the technology as ...

7. All the best Prime Day deals to shop for your grandkids while ...

   www.aol.com/lifestyle/all-the-best-prime-day...

   Apple AirPods (2nd Generation) $80 $129 Save $49. A bit of a "big kid gift" but at this outrageous price for AirPods, you can feel good about such a high-tech gift for younger kids. $80 at Amazon ...