Active 3D Glasses: 5 Fast Facts

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Fact #1. Although 3D viewing may seem like a modern invention, the concept has been around for a long time. In 1838, an English scientist and inventor created the stereoscope for displaying three-dimensional images. It was a rather clunky-looking machine equipped with pop-up mirrors or lenses. Soon after, a Scottish physicist streamlined the device by removing its mirrors and making use of prisms to combine dissimilar images.
Fact #2. The active 3D shutter system first appeared in 1922 and was referred to as the Teleview 3D system. It was installed at the Selwyn Theater in New York City and featured several screenings. The system operated through the running of right and left-eye prints using a pair of interlocking projectors with their shutters being out of phase. Each seat in the theater had its own viewing device.
Fact #3. Active 3D glasses display stereoscopic 3D images to each eye individually. While the image intended for the left eye is being displayed, the view from the right eye is blocked, and vice versa. This shuttering action shifts the view between the right and left eyes very rapidly.
Fact #4. Most active 3D glasses receive their power from a battery or USB connection. They're controlled by a timing signal that allows them to alternately block one eye. This blocking action occurs in synchronization with the refresh rate of the viewing screen to which the glasses are connected. They can be connected to the screen through either wired or wireless signals.
Fact #5. Lightweight design and comfort are equally important considerations to take into account before making a purchase. You'll be wearing these glasses for extended periods of time when enjoying your entertainment. The last thing you want is an excessively bulky pair of 3D glasses that give you a headache.