Why do movie theaters still use projectors? The Fact Checks

To the audience, the most significant part of digital cinema is the projection system. This is the last bit of technology that controls how the motion picture really looks toward the stopping point.

Basically, everyone concurs that a decent film projector stacked with an unblemished film print delivers a vibrant, fantastic, picture. The issue is, each time you play the motion picture; the film quality drops a bit. At the point when you go out to see a film that has been playing for a couple of weeks, you’ll most likely observe several scratches and bits of earth.

Today, there are two significant digital cinema projector technologies: Micromirror projectors and LCD projectors.

Micromirror projectors


Micromirror projectors, similar to Texas Instruments’ Digital Light Processing (DLP) line, structure pictures with an array of microscopic mirrors. In this system, a powerful lamp sparkles light through a prism. The prism parts the light into the segment hues green, red, and blue. Each shading bar hits an alternate Digital Micromirror Device (DMD) – a semiconductor chip that is shrouded in excess of a million pivoted mirrors.

In view of the information encoded in the video signal, the DMD surrenders the little mirrors to mirror the hued light. By and large, the little spots of reflected light structure a monochromatic picture. To perceive how this functions, envision a horde of people on the ground around evening time, each holding a square-foot mirror. A helicopter flies overhead and sparkles a light down on the group. Based upon which people held their mirrors up, you would see an alternate reflected picture.

In reality, a large portion of the individual mirrors are flipped from “on” (reflecting light) to “off” (not reflecting light) and back again a huge number of times each second. A mirror that is flipped on a more prominent proportion of the time will reflect even more light thus will shape a more brilliant pixel than a mirror that isn’t flipped on for as long.

This is the means by which the DMD makes a degree among light and dull. The mirrors that are flipping quickly from on to off make fluctuating shades of dark (or shifting shades of red, green and blue, for this situation).

LCD projectors

LCD projectors, for example, JVC’s Digital Image Light Amplifier (D-ILA) line, take a shot at a slightly unique system. These projectors reflect high-force light off a stationary mirror secured with a liquid crystal display (LCD). In view of the digital signal, the projector guides a portion of the liquid crystals to give mirrored a chance to light through and others to square it.

There is a flip-side to digital projector technology. In both projector designs, singular pixels may part from time to time. At the point when this occurs, it corrupts the picture nature of each and every motion picture appeared on that projector. Interestingly, if a film print gets scratched, it’s just that specific motion picture that is damaged – the following print looks fine.