Like any projector, they also can't compete with ambient light. An ambient light-rejecting screen can help considerably, but they aren't cheap. When you can get a 100-inch TV for $3,000, which will be ...

The digitizizer is based on a Kodak carousel slide projector. It’s fitted with LED strips instead of the original light source, which are used to illuminate the slides themselves. An Arduino ...

A device that projects computer and TV output onto a white or silver fabric screen ... Data projectors are widely used in classrooms and auditoriums for instruction and slide presentations.