Digital projectors are differentiated by their resolution, brightness, and the type of projection technology used. A digital projector is connected to a computer and can project the images or files on the computer screen onto a wall.
Most projectors used today are digital or computer-based projectors. The mirror reflects the enlarged image of the transparency on the wall. Overhead projectors consist of a flat light box with a mirror attached by a flex arm to the box. An overhead projector is also a transparency projector that uses a bright light source and lens to collimate the light.
The most common slide projector is a carousel projector that uses a stepper motor to advance the carousel and load the slide into the holder in succession. Light from the bulb passes through the transparent slide and focusing lens and the image is projected on a screen or wall. A slide projector is an opto-electronic projector that uses a light source-usually a fan-cooled light bulb, a reflector, a slide holder, a focusing lens, and a condensing lens. Projectors are commonly used in classrooms and conference rooms for presentations. Projectors include electronic devices that display video and computer-based images or presentations and transparency devices that use a light source and lens to project an image from a transparent film medium. Projectors receive data from a computer or video source and project this data onto a screen via internal light sources, power sources, and converters.
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