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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. Projector - Wikipedia

   en.wikipedia.org/wiki/Projector

   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.

4. Projection screen - Wikipedia

   en.wikipedia.org/wiki/Projection_screen

   Sony makes a screen [6] that appears grey in normal room light, and is intended to reduce the effect of ambient light. [7] This is purported to work by preferentially absorbing ambient light of colors not used by the projector, while preferentially reflecting the colors of red, green and blue light the projector uses. [8]

5. Color Light Output - Wikipedia

   en.wikipedia.org/wiki/Color_light_output

   The Color Light Output specification provides projector buyers the advantage of a standard, objective metric with which to make product comparisons and selections. Projector manufacturers generally provide information about resolution, white light brightness and contrast ratio as descriptors of projector performance.

6. Digital light processing - Wikipedia

   en.wikipedia.org/wiki/Digital_Light_Processing

   A three-chip DLP projector uses a prism to split light from the lamp, and each primary color of light is then routed to its own DMD chip, then recombined and routed out through the lens. Three chip systems are found in higher-end home theater projectors, large venue projectors and DLP Cinema projection systems found in digital movie theaters.

7. Color rendering index - Wikipedia

   en.wikipedia.org/wiki/Color_rendering_index

   A color rendering index (CRI) is a quantitative measure of the ability of a light source to reveal the colors of various objects faithfully in comparison with a natural or standard light source. Color rendering, as defined by the International Commission on Illumination (CIE), is the effect of an illuminant on the color appearance of objects by ...