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2. LCD projector - Wikipedia

   en.wikipedia.org/wiki/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 .

3. Beamer (LaTeX) - Wikipedia

   en.wikipedia.org/wiki/Beamer_(LaTeX)

   Beamer is a LaTeX document class for creating presentation slides, with a wide range of templates and a set of features for making slideshow effects. It supports pdfLaTeX, LaTeX + dvips, LuaLaTeX and XeLaTeX. [1] The name is taken from the German word "Beamer" as a pseudo-anglicism for "video projector".

4. Presentation program - Wikipedia

   en.wikipedia.org/wiki/Presentation_program

   The "slide" analogy is a reference to the slide projector, a device that has become somewhat obsolete due to the use of presentation software. Slides can be printed, or (more usually) displayed on-screen and navigated through at the command of the presenter. An entire presentation can be saved in video format. [6]

5. Transparency (projection) - Wikipedia

   en.wikipedia.org/wiki/Transparency_(projection)

   Many overhead projectors are used with a flat-panel LCD which, when used this way, is referred to as a spatial light modulator or SLM. Data projectors are often based on some form of SLM in a projection path. An LCD is a transmissive SLM, whereas other technologies such as Texas Instrument's DLP are reflective SLMs. Not all projectors use SLMs ...

6. Liquid-crystal display - Wikipedia

   en.wikipedia.org/wiki/Liquid-crystal_display

   LCDs can either be normally on (positive) or off (negative), depending on the polarizer arrangement. For example, a character positive LCD with a backlight has black lettering on a background that is the color of the backlight, and a character negative LCD has a black background with the letters being of the same color as the backlight.

7. Rear-projection television - Wikipedia

   en.wikipedia.org/wiki/Rear-projection_television

   The projector uses a bright beam of light and a lens system to project the image to a much larger size. A front-projection television uses a projector that is separate from the screen and the projector is placed in front of the screen. The setup of a rear-projection television is in some ways similar to that of a traditional television.