What is a video projector used fo?

What is a video projector used fo?
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Let's say that you want to have a really large-screen TV butcan't afford one, or don't have the space for one. You can use avideo projector to create a large TV image on any blank wall. Youmight need to make the room a little darker, because the projectorwill have a dimmer image than a backlit TV screen.
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