4 Different Kinds of 3d Glasses and How They Work

The long awaited 3D TV was finally unveiled in the year 2010. With 3D TV’s came 3D glasses as accompaniments to be used to create the depth illusion in 3D images. Today, only six years since 3D glasses were unveiled there are more than three different types of these glasses, and you are probably wondering which one is better and how they work. We are going to review the four basic kinds of 3D glasses and elaborate on how each kind works.

Difference between Passive and active 3D glasses
First, it is important to mention that 3D glasses are broadly categorized into active. Passive glasses were the first in the market, and they do not use power to create the depth illusion. They can be grouped into polarized 3D glasses, color anaglyph, and Chromadepth glasses. The difference between these three passive types of 3D glasses simply lies on how different kind of light is filtered/ blocked to create the depth illusion. Active glasses, on the other hand, use power to create the depth illusion. They are based on the LCD technology and operate by darkening the lenses at different rates to create the depth illusion.

Passive 3D glasses
Anaglyph glasses. They are more common and also referred to as red-cyan 3D glasses because they come with one red and one cyan colored lens. They create the depth illusion through anaglyph filtering of light. The cyan lens filters/blocks all red light while the red lens filters/blocks all cyan and bluish light. This allows our eyes to capture two different images which are then merged by the brain to create protrusion/popping effect which is the depth illusion.

Polarized 3D glasses: They work by the polarization of light principle and have a yellowish brown tint. They work by controlling/ polarizing the overall amount of light entering the eye. Each of the lenses has a different light restricting/polarizing ability meaning that it allows only light of a given wavelength to pass through and blocks the rest. The result is that each eye sees a stream of polarized images depending on color. Images appear to be superimposed and since this happens at a great frequency and a kind of horizontal movement (depth) of the image is created.

Chromadepth 3D glasses: They use microscopic prisms contained in special view foils to create the depth illusion. These special view foils are inscribed into glasses and mounted into frames to make glasses. They work on the premise that when light passes through a prism, colors are separated to a varying degree. An image is thus translated a given number of times depending on its color. Depending on color then images are widely separated and appear to be interlaced. The brain then produces a spatial impression from these interlaced, different images

Active 3D glasses:

Shutter 3D glasses. They use power to vary the darkness of the alternately so that different images are seen from different lenses depending on color. They are powered by either a battery or via USB and cost a little more than passive 3D glasses. They, however, offer better images and can be used in environments with a lot of light where 2D glasses are a nuisance to use

Passive 3D glasses are more convenient for they are easier to use and less bulky. However, the active 3D lenses offer better picture quality.

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