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  2. Overhead projector - Wikipedia

    en.wikipedia.org/wiki/Overhead_projector

    An overhead projector works on the same principle as a slide projector, in which a focusing lens projects light from an illuminated slide onto a projection screen where a real image is formed. However some differences are necessitated by the much larger size of the transparencies used (generally the size of a printed page), and the requirement ...

  3. Projection screen - Wikipedia

    en.wikipedia.org/wiki/Projection_screen

    Projection screen in a movie theater Home theater projection screen displaying a high-definition television image. A projection screen is an installation consisting of a surface and a support structure used for displaying a projected image for the view of an audience.

  4. 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.

  5. 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 ...

  6. LCD projector - Wikipedia

    en.wikipedia.org/wiki/LCD_projector

    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 of dichroic filters that separates light to three polysilicon panels – one each for the red, green and blue components of the video signal.

  7. Rear-projection television - Wikipedia

    en.wikipedia.org/wiki/Rear-projection_television

    Modern color rear-projection television had become commercially available in the 1970s, [15] [16] [17] but at that time could not match the image sharpness of a direct-view CRT. Early 2000s CRT projection TV with 1080i HD ready capabilities has an RCA line level input for use of internal speakers as a center channel in a surround sound system.

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