ABSTRACT
A projection display creates an image on an auxiliary surface, separate from the projector itself. For this reason, the images can be made very large, able to be viewed by groups of people, for instance, at a cinema. Typically, projectors are structured with a light source separate from the image-forming element, or light valve. As much of the light as possible from the light source is channelled to the light valve, which in turn relays the formed image through the projection optics to the screen.
