An LCD projector works using the same concept as an old fashioned overhead projector. A powerful lamp is used to project an image that comes from and outside source, such as a DVD player or computer. A fan near the lamp cools the projector off as the projector is running. The lamp itself can reach extreme temperatures that could melt the bulb. The image appears with vibrant colors on a white screen and allows multiple people to see what you’re working on without them having to crowd around a small screen. The projector is a better way of watching a presentation or a movie.