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  2. Rear-projection television - Wikipedia

    en.wikipedia.org/wiki/Rear-projection_television

    This new tube and optical system offered several advantages over the previous system. The set cabinet was able to be smaller. Previously the screen was on top of a substantial piece of furniture but this new system allowed the screen to occupy a similar position as a direct view television's screen in a regular console sized cabinet.

  3. Recreational vehicle - Wikipedia

    en.wikipedia.org/wiki/Recreational_vehicle

    An example of a Class C recreational vehicle, recognisable by the extension of the cabin over the cab Motor home Map symbol used by the US NPS to indicate an RV campground. A recreational vehicle, often abbreviated as RV, is a motor vehicle or trailer that includes living quarters designed for accommodation. [1]

  4. 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 ...

  5. Large-screen television technology - Wikipedia

    en.wikipedia.org/wiki/Large-screen_television...

    A 140 cm (56 in) DLP rear-projection TV Large-screen television technology (colloquially big-screen TV) developed rapidly in the late 1990s and 2000s.Prior to the development of thin-screen technologies, rear-projection television was standard for larger displays, and jumbotron, a non-projection video display technology, was used at stadiums and concerts.

  6. Screen-door effect - Wikipedia

    en.wikipedia.org/wiki/Screen-door_effect

    The screen-door effect (SDE) is a visual artifact of displays, where the fine lines separating pixels (or subpixels) become visible in the displayed image. This effect can be seen in digital projector images and regular displays under magnification or at close range, but the increases in display resolutions have made this much less significant.

  7. Projection screen - Wikipedia

    en.wikipedia.org/wiki/Projection_screen

    If a screen material looks grey on casual examination then its total reflectance is much less than 1. However, the grey screen can have measured gain of 1 or even much greater than 1. The geometric behavior of a grey screen is different from that of a white screen of identical gain. Therefore, since geometry is important in screen applications ...

  8. Slide projector - Wikipedia

    en.wikipedia.org/wiki/Slide_projector

    A slide projector is an optical device for projecting enlarged images of photographic slides onto a screen. Many projectors have mechanical arrangements to show a series of slides loaded into a special tray sequentially.

  9. Sliding door operator - Wikipedia

    en.wikipedia.org/wiki/Sliding_door_operator

    To open the door, the motor turns the pulley, which in turn turns the belt, which in turn drags the door. To close the door, the reverse occurs. Historically, elevator doors were opened using simple harmonic motion by a set of mechanical linkages; the motor, geared down, would rotate linked arms, which in turn would drive the door.

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