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How Do Plastic 3D Glasses Work? Both the lenses of the 3D glasses and the images on the screen are polarized. This restricts the amount of light that is able to enter your eyes. On screen, there are actually two separate images close to each other. Each eye sees one of the images through lenses with similar polarization to those that are on the screen. This causes the brain to merge the images that you’re seeing through each eye into one 3D image. No matter what type of 3D glasses you use, deceiving the brain to see 3D content is...

What is the difference between active shutter glasses and passive polarized 3D glasses? Active Shutter Glasses: This technology has been adopted by most consumer electronics firms like LG, Samsung, Panasonic, etc. With this technology, an HDTV will display one image to your left eye and one image to your right eye. Since the effective frame rate is halved, these HDTVs need to have double the refresh rate of HDTVs (60 Hz). This is why you will find that all 3D HDTVs have a minimum frame rate of 120 Hz (most have a frame rate around 240 Hz or even 480...

What is 4D? The addition of special effects to a theatrical presentation to create a “fourth dimension” – the sensation of tactile experience: scent, temperature, touch. Examples:Beetles tickle the legs of unsuspecting cinema-goers, the wing beat of a gigantic dragon breezes through the rows of seats and spiders descend from the ceiling.

How can you get 3D from a 2D screen? A 3D TV or theater screen showing 3D content displays two separate images of the same scene simultaneously, one intended for the viewer’s right eye and one for the left eye. The two full-size images occupy the entire screen and appear intermixed with one another–objects in one image are often repeated or skewed slightly to the left (or right) of corresponding objects in the other–when viewed without the aid of special 3D glasses. When viewers don the glasses, they can perceive these two images as a single 3D image.

How is 3D TV different from 3D in the theater? Many viewers have experienced newer 3D presentations, such as IMAX 3D, in movie theaters. Though the technologies differ somewhat–most theaters use passive polarized 3D glasses, for example–the main practical difference between 3D TV in the home and theatrical 3D is the size of the screen. In the home, the image is generally much smaller, occupying a lower percentage of viewers’ fields of vision. Among TV makers we asked, only Panasonic recommend a closer seating distance (of 3x the screen height away–about 6.2 feet from a 50-inch screen) for a better...