A projector is not a television per se, but a device that takes a video signal and projects the image on surface (a screen or even a wall) using a lens system. The concept is the same as in a movie theater. Their common display resolutions include SVGA (800×600 pixels), XGA (1024×768 pixels), 720p (1280×720 pixels), and 1080p (1920×1080 pixels). The brighter the lamp inside the projector, the better the final image – and the brighter can be the viewing room. A lamp’s light output is measured in lumens.

All the rear-projector technologies we’ve just reviewed also apply to video projectors, following the same principals. We’ll do a quick recap of those technologies, now taking in consideration the characteristics of front projection.