Multimedia projector
Projection systems have been used for many years to project motion pictures and still photographs onto screens for viewing. The widespread acceptance of using computers to facilitate group communications has created a large demand for devices that project computer displays. Multimedia projection systems have become popular for purposes such as conducting sales demonstrations, business meetings, classroom training, and for use in home theaters. A multimedia projector receives analog video signals from a cable connected to a video source, such as a personal computer (PC). The video signals represent display images of the type rendered by the PC. The analog video signals are converted in multimedia projector into digital video signals to control digitally-driven display devices, such as a transmissive or reflective liquid crystal displays or digital micromirror devices, to form a display image that is cast as a projected image surrounding a projection axis onto a projection screen. A popular type of multimedia projection system employs a broad-spectrum light source and optical path components upstream and downstream of an image-forming device, such as a liquid crystal display (LCD) or a digital micro-mirror device (DMD), to project the image onto a display screen. In addition to video signals, multimedia projection display systems also can utilize audio signals and system control signals, either from or to a personal computer or another media source. Multimedia projectors include audio speakers for generating audio accompaniment to video presentations. System control signals are transmitted between the multimedia projection display system and the personal computer system for controlling their interaction.
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