So long as the actual display has a high enough refresh rate so that each eye can get at least 60 frames per second, an image on the screen will look 3D. Data that is meant for your left eye is blocked from getting to your right one, and vice versa. That power is used to electronically block or shutter first the left and then the right lens. Early models used standard AA or AAA batteries, but the newest ones use rechargeable cells that draw power from special cradles, or even from a computer’s USB port when plugged into it. The difference between active and passive 3D is in how these images are achieved, and actually refers to the glasses or viewing device used.Īctive 3D could also be called powered 3D, because it requires that the glasses used be powered somehow. (Interesting fact: people with one very dominant eye or who are blind in one eye can’t see 3D images because they only receive one set of inputs, so their brain, rightly in this case, interprets a 2D image as being flat.) Although richer data is used in 3D today, and a few more tricks are employed, how 3D works is still very similar to the old stereoscopic viewers of yesteryear. Your brain does much of the post-processing work, and somebody figured out that by sending inputs that are slightly offset from each other independently to your left and right eye, that your brain perceives the flat surface as being in three dimensions. This 3D trickery works because of what happens after you see an image. To make an image look 3D, some illusions must be employed. The same is true for the images made by any projector. And the images it creates will also be flat. As you well know, your monitor screen is flat. What are the differences?įirst, let’s look at the basics of 3D, and then go into how different devices create it. For any device you are thinking about bringing into your agency, you’re probably going to want to decide if you need an active or passive display first, and then start your shopping from there. They are actually quite different, with various competing advantages and flaws. And many of the monitors GCN has reviewed over the past year have had 3D capabilities, even if they were not a main focus of the unit.īut there are two kinds of 3D technology to choose from today, active and passive. For example, Epson’s new line of 3D projectors, designed specifically for education and training, is the kind of thing that could turn up soon in agencies.

It seems that 3D displays are everywhere these days, and although they are slightly less common in government, that will begin to change.

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