Video projectors function by means of acknowledging video signals emitted by a source and projects the image on a screen with the help of a system of lenses. There are various technical tools with the help of which video projection is ensured. The foremost among them is the LCD technology. The LCD projectors function with the help of liquid crystal display light gates and they are used for demonstrating computer data, videos and images on flat surfaces or a screen. In the very beginning, LCDs were used in accordance with overhead projectors and the LCD system itself had no light source within itself.
