Background Research & Finding Facts
A video projector is an image projector that receives a video signal and projects the
corresponding image on a projection screen using a lens system. All video
projectors use a very bright light to project the image, and most modern ones
can correct any curves, blurriness, and other inconsistencies through manual
settings. Video projectors are widely used for many applications such as,
conference room presentations, classroom training, home theatre and concerts. Projectors
are widely used in many schools and other educational settings, sometimes
connected to an interactive whiteboard to interactively teach pupils.
A video projector, also known as a digital projector, may
project onto a traditional reflective projection screen, or it may be built
into a cabinet with a translucent rear-projection screen to form a single
unified display device. The cost of a device is determined not only by its
resolution but also by its light output. A projector with a higher light output
is required for a larger screen or for a room with a larger amount of ambient
light. For example, a light output of approximately 1500 to 2500 ANSI lumens is
suitable for small screens viewed in rooms with low ambient light;
approximately 2500 to 4000 lm is suitable for medium-sized screens with some
ambient light; over 4000 lm is needed for very large screens or for use in
rooms with no lighting control such as conference rooms.
by Ibtisam Tayeh 1091103359
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