Oct 1 2010
3D Glasses – A Short history
Are 3D Glasses always needed when watching 3D programmes? This is because the best 3D pictures are obtained by delivering seperate images to each eye. The best way to accomplish this is through a pair of 3D glasses which make sure that each eye receives the image from a slightly different angle.
3D Parallax
Humans naturally see in 3 dimensions due to parallax, which is the overlapping line of vision that occurs when using 2 eyes to view an object. Since our eyes are several centimeters apart, each eye sees an object at a slightly different angle. This slight difference is what causes depth perception and our experience of seeing in three dimensions.
Stereoscopic Images
Stereoscopic imaging (3D imaging) was first implemented back in the 1800s. By looking at two different flat images next to each other, parallax was artificially created and viewers had the experience of seeing a three dimensional scene instead of a flat photo.
3D Films
When movies first came along there was a lot of experiments with 3D imaging. There are a number of methods but one uses polarised 3d glasses where the film is shout from two slighlt differing perspectives. Two projectors are then used to show the movies. There is also another method where alternate images for the left and right eye are printed onto one strip. With each of these methods the viewer will have to wear 3D Glasses to complete the 3D effect.
3D glasses
There are a many different kinds of 3D glasses that people have worn, depending on what methods are used to produce the 3D movie. Two of the most common have been active glasses and polarized glasses. Viewers who wear linearly polarized 3D glasses have to keep their heads reasonably level to maintain the three dimensional effect, so that their eyes remain aligned with the light and images that come from the projector. Viewers who wear circularly polarized 3D glasses can still see in 3D if they tilt their heads.
Anaglyph 3d glasses
Eyes see combinations of the three primary colors: blue, red and yellow. Anaglyph 3d glasses simply use a different colored lens for each eye. The anaglyph glasses pair one primary colored lens (like red) with one mixed colored lens like cygan (this is a mixture of green and blue). This then blocks out parts of the color spectrum in one eye, and different parts of the color spectrum in the other eye. The difference is enough for each eye to see a slightly different image while looking at the movie screen, causing the brain to process the scene as if it were three dimensional.
3d Active Glasses
3D active shutter glasses are glasses that were originally designed for the gaming industry but have evolved to be used across multiple flat screens platforms such as film and sport. The glasses are generally controlled by Bluetooth or Infra Red, and contain LCD (liquid crystal). They are synchronized with the refresh rate of the display to alternately darken and allow light to each eye. In addition, they alternate back and forth between the lenses blocking out light and creating a parallax view.
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