- There are three different types of 3-D glasses.3d glasses sunrise taiwan image by Paul O'Hearn from Fotolia.com
Three-dimensional glasses, better known as 3-D glasses, have been used in movie theaters since the 1950s to give the illusion of 3-D and attract moviegoers. Three-dimensional technology is even used on theme park rides. There are three different types of 3-D glasses to enhance your movie experience. - Red/blue glasses contain one red lens and one blue lens and are an iconic symbol for 3-D viewing. Two projectors are needed for red/blue glasses to create a three-dimensional image. One projector puts a red image up on the screen and the other puts up the same image in blue. When you wear the 3-D glasses, one lens filters out the red while the other lens filters out the blue to give the appearance of objects popping off the screen at you. But these glasses only work for black and white movies.
- Polarized 3-D glasses are more modern and can be used with movies in color and theme park rides. Polarized glasses work in the same manner as red/blue glasses. Two projectors put an image on the screen, but instead of producing an image in different colors, the projectors’ images have different polarizations. Each lens focuses out one polarization, creating a 3-D picture.
- LCD shutter glasses require the projector to quickly alternate left and right images onto the screen. This has to happen at 60 frames per second for each image in order to avoid a strobe effect. The liquid crystal lenses of the LCD shutter glasses filter out the unwanted image in each eye so the left eye only sees the left image and the right eye only see the right image. This allows you to watch the movie in 3-D.
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