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A device used to display information onto a large (usually) flat surface for either presentations, IMAG (Image Magnification), or other media. Common types of projectors are LCD, DLP, and CRT.

A Newer LCD or DLP Projector:
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eHow - How do LCD Projectors Work

A CRT Projector:

Other types of (mostly obsolete) projectors include: opaque projector, overhead projector, 35mm slide projector, large-format slide projector, PANI, PIGI, Elmo, IMAX; 8mm, 16mm, 35mm, 70mm film projectors; scenic projectors, RDS, filmstrip projector, linnebach projector.

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