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An 1895 mechanical color wheel, used for experiments with color vision A mechanical four-petal (red, green, blue, white) color wheel inside a 1998 digital light processing (DLP) video projector. A color wheel or other switch for changing a projected hue (e.g., for an optical display) is a device that uses different optics filters or color gels ...
A see-through display or transparent display is an electronic display that allows the user to see what is shown on the screen while still being able to see through it. The main applications of this type of display are in head-up displays , augmented reality systems, digital signage, and general large-scale spatial light modulation .
At the front of the projector, the protruding projection lens features rings to control focal length and focus. After the collimated beam passes through the transparent slide, it is enlarged by a projection lens onto a flat projection screen so the audience can view the reflected image. For some slide projectors, the projection lens is ...
Some viewers find the high-pitched whine of the color wheel to be an annoyance. [18] [19] [20] However, the drive system can be engineered to be silent and some projectors don't produce any audible color wheel noise. Dithering noise may be noticeable, especially in dark image areas. Newer (post ≈2004) chip generations have less noise than ...
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 ...
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A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent lens , but some newer types of projectors can project the image directly, by using lasers .
Perceived color in a projected image is a factor of both projection surface and projector quality. Since white is more of a neutral color, white surfaces are best suited for natural color tones; as such, white projection surfaces are more common in most business and school presentation environments.
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