In the 1980s, the first data projectors weighed more than 40 pounds, using a single cathode ray tube (CRT) to project a monochrome image. When color units came out, they weighed even more because ...

1980s: The Data Projector. Photo: Computer Desktop Encyclopedia. A Brief History: A data projector takes signals from a video source, such as a computer or television, and projects an image on a ...