Emissione della luce

The only major component of a digital projector we haven't yet discussed is the projection lens, which projects a focused image of the panel(s) onto an external screen surface. To do this with any fidelity requires a large number of lens elements-- as many as twelve are not uncommon.

Most projection lenses have adjustable focus and zoom. Some projectors allow the lens to be shifted up and down, others also left and right. This moves the image with respect to the projector without introducing keystone distortion, which would result if the projector were simply tilted in the desired direction. The projection lenses on these projectors tend to be much larger and heavier than fixed models because of the need to maintain reasonably uniform brightness across the image. Focus, zoom, and lens shifts, when available, are typically accomplished using small DC motors under the control of the CPU. These are, in essence, the projector's muscular system.

WRAP UP
I see by the clock that our class time is up. Hopefully, from this brief course you have gained a better understanding of what lies inside a digital projector and how it all works together. If you own or otherwise have access to a digital projector, your homework assignment is simple: go watch movies. Class dismi