RSS

How do 3D glasses work?

15 Jan

Hello Everybody,

In a physics lecture during the week a student asked the question:

Does light polarization has anything to do with the way 3D glasses work?

Here is a short explanation about 3D glasses. I hope you find this useful:)

In a movie theater, the reason why you wear 3-D glasses is to feed different images into your eyes just like the View-Master does. The screen actually displays two images, and the glasses cause one of the images to enter one eye and the other to enter the other eye. There are two common systems for doing this:

  • Polarization – At Disney World, Universal studios and other 3-D venues, the preferred method uses polarized lenses because they allow color viewing. Two synchronized projectors project two respective views onto the screen, each with a different polarization. The glasses allow only one of the images into each eye because they contain lenses that are polarized as well. (See How Sunglasses Work to learn about polarized lenses.)
  • Red/Green or Red/Blue – Polarization cannot work on an ordinary TV screen, so the red/green system is used. Two images are displayed on the screen, one in red and the other in blue (or green). The filters on the glasses allow only one image to enter each eye, and your brain does the rest. You cannot really have a color movie when you are using color to provide the separation, so the image quality is not nearly as good as with the polarized system.

There are some more complicated systems as well, but because they are expensive they are not as widely used. For example, in one system, a TV screen displays the two images alternating one right after the other. Special LCD glasses block the view of one eye and then the other in rapid succession. This system allows color viewing on a normal TV, but requires you to buy the special equipment.

Reference: http://entertainment.howstuffworks.com/question360.htm

Advertisements
 
Leave a comment

Posted by on January 15, 2015 in Uncategorized

 

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

 
%d bloggers like this: