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2. 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. A virtual retinal display, or retinal ...

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. Video projector - Wikipedia

   en.wikipedia.org/wiki/Video_projector

   A video projector is an image projector that receives a video signal and projects the corresponding image onto a projection screen using a lens system. Video projectors use a very bright ultra-high-performance lamp (a special mercury arc lamp ), Xenon arc lamp , metal halide lamp , LED or solid state blue, RB, RGB or fiber-optic lasers to ...

5. OpenLP - Wikipedia

   en.wikipedia.org/wiki/OpenLP

   OpenLP is a worship presentation program licensed under the GNU General Public License version 2. It includes the ability to search through lyrics for certain words, search for Bible verses in the Bible, display lyrics and Bible verses in a friendly way to the congregation and interact with popular presentation programs to provide users with an easy way to control a presentation (with ...

6. LCD projector - Wikipedia

   en.wikipedia.org/wiki/LCD_projector

   A projector's throw ratio is used when installing projectors to control the size of the projected display. [1] For example, if the throw ratio is 2:1 and the projector is fourteen feet away from the screen, then the display width will be seven feet.

7. Opaque projector - Wikipedia

   en.wikipedia.org/wiki/Opaque_projector

   Opaque projectors are not as common as the overhead projector. Opaque projectors are typically used to project images of book pages, drawings, mineral specimens, leaves, etc. They have been produced and marketed as artists' enlargement tools to allow images to be transferred to surfaces such as prepared canvas, or for lectures and discourses.