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An LCD projector is a type of projector based on liquid crystal displays which can display images, data or video. An LCD projector works on transmissive technology. LCD projectors are more popular than many alternatives due to the fact that they are cheaper to produce and have excellent color reproduction.
An overhead projector is a variant of slide projector that is used to display images to an audience. Contents. Optical system. An overhead projector works on the same principle as a 35mm slide projector, in which a focusing lens projects light from an illuminated slide onto a projection screen where a real image is formed.