Why powered 3d glasses

While one lens filters out all the red in an image, the other lense filters out the cyan, causing your brain to see the picture in 3D. How 3D glasses work when it comes to polarized lenses depends on deceiving your eyes just like anaglyph glasses do. How do polarized 3D glasses work, you ask? They restrict the light that enters your eyes, but instead of restricting the light by red and blue colors, they have a yellowish brown tint.

The image on the screen also has a role to play. In addition to the polarization on the glasses, the projected image is actually two images that are superimposed on the same screen through a orthogonal polarizing filter.

Then the glasses, which have the same type of filter, allow each eye to see a the two individual images on the screen.

Shutter glasses are considered the most advanced type of 3D glasses available today. While the other two types of 3D glasses use something called passive 3D, shutter glasses utilize active 3D. Instead, shutter glasses work through LCD screen technology that darkens each lens, alternating the left and the right.

Shutter glasses are usually battery powered, or even USB-supported, and are more expensive than traditional 3D glasses. Passive 3D glasses don't exhibit any flicker. To their credit, active shutter glasses are able to display more detail to each eye — the alternating-frame technology means a full p image is shown to each eye, rather than the half frame alternating lines down the TV screen that passive 3D shows.

This means that the video will have cleaner lines, especially on curves and edges. If high quality video is crucially important to you, active 3D is the choice to make. You could just watch the movie in 2D and have the best picture, but that's another story.

So, passive 3D wins out on price, weight, size and anti-flickering, but active 3D is still the go-to for outright image quality. Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more. Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

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Sign up here. Join the newsletter! Geoff Morrison helps him out. The technology First, the basics. In order for you to see "depth" from a 3D TV, each eye has to see slightly different information. Ideally, the right eye doesn't see any of the information meant for the left eye, and vice versa. The two current methods to do this are called active and passive.

Active 3D uses battery-operated shutter glasses that do as their name describes: they rapidly shutter open and closed. This, in theory, means the information meant for your left eye is blocked from your right eye by a closed opaque shutter.

All that's required of the TV is the capability to refresh fast enough so each eye gets at least 60 frames per second. They've been able to do this for a while.

Here's what the active glasses look like when they're working. Keep in mind the camera was set at a fast shutter speed itself in order to capture the lenses, well, shuttering.

Passive uses inexpensive polarized glasses, like what you get at most movie theaters. The TV has a special filter that polarizes each line of pixels. This filter a Film Patterned Retarder is one type makes the odd lines on the screen only visible to the left eye, and the even lines only visible to the right.

Without the glasses, the TV looks normal. Now here's the same TV, but viewed through the glasses. Note the "missing" lines. This is because the camera is only viewing the TV through one lens of the passive glasses click to enlarge. It might also help if you check out my article on How 3D content works. The objective Each method has strengths and weakness, and only the marketing from their proponents says otherwise. With active, each eye gets the full p resolution of the source.

On the other hand, the glasses make the image look dimmer, as they block some light. With LCDs this isn't really a problem, but with plasma and front projectors, it's more noticeable. While some of the glasses are lightweight, most aren't.