As with a lot of classroom tech, overhead projectors declined in use as more high-tech options for classroom visual aids became available. In the 1980s, data projectors that could be connected to a TV ...

The U.S. Army used a version of the overhead projector for training purposes during World War II, according to the National Museum of American History. A Brief History: A data projector takes signals ...

A device that projects computer and TV output onto a white or silver fabric screen that is wall, ceiling or tripod mounted. Data projectors are widely used in classrooms and auditoriums for ...