3D Glasses - How Do They Work?
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Feb 2, 2012

3D Glasses - How Do They Work?

Gone are the days of red and blue 3D glasses that were seen as a novelty, reserved for cinematic shows at theme parks or for floods of people flocking to their nearest cinema for the 3D version of Hollywood’s newest release.

In the comfort of our own homes we can now watch 3D television with 3D glasses without the old-fashioned one green one red lens fashion faux pas and unsightly red and green or red and blue image on the screen. That's a thing of the past as new 3D glasses - like sunglasses in appearance - are available.

So how do the new wave of 3D glasses work and allow us to see a 3D image?

In order to emit a 3D image, the television itself must deliver offset images that filter separately to the left and right eye. The most common way to do this is by viewers wearing 3D glasses that filter the offset images to each eye.

There are two types of 3D – active and passive. Active 3D glasses display an image on the left eye and then on the right eye, swapping in quick succession. The glasses themselves contain shutters that open and close in sync with whatever is displayed on the screen which allows the left eye to see the image for the left eye, and the right to do the same. Active 3D is the clearest form of 3D, and the resulting effect is a better quality picture.

Passive 3D glasses do not have shutters to send the image from the screen to the eye. The screen for passive 3D show one image for the left eye and one image for the right eye at the same time. The glasses contain filtered lenses which ensure that each eye sees the right image. The effect of passive 3D is that as the images are being shown onscreen at the same time, the resolution of the picture is half of that of active 3D, and the image is therefore not in full HD.

The older 3D movie screens incorporated red and green images on the screen which were picked up by the red and green filters on the 3D glasses and one image was sent to each eye, meaning it was difficult to have a good quality colour film via this old method of 3D.
Active and passive 3D allows for a more refined picture and a resulting better viewing experience all round.

Guest Author Bio:
Amy is a blogger for online glasses retailer Direct Sight