Computer projectors are digital devices that are connected to a computer as a source of video display. They receive information from the computer and project the information in the form of light rays to a screen. The screen is placed in a strategic position such that it receives all the rays from the projector. The rays appear on the screen in the form of images just as they are on the computer screen. There are different types of computer projectors depending on the features and the mode of radiation. These include the Liquid Crystal Display (LCD), digital light processing (DLP) and the Liquid Crystal on silicon (LCOS). All these look almost the same from the outside though the method of radiation differs.

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