This curiosity has led you to this situation: You are sitting in a 3D movie when you get the inclination to take off your glasses and try watching the movie without them. Maybe by doing this sneaky move you will find out how 3D is possible, but when you take them off, all you see is a blurry screen with red and blue lines all over the screen.
Some people think that 3D TVs possess everything it needs to be 3D inside the actual television, but this is not the case. In order for 3D TV to work, it needs the help of those glasses. 3D glasses actually come in two forms: passive and active. Each form of 3D glasses works much differently than the other, but even with their differences, they both have the same goal in mind—to trick your brain into depth illusion and to produce movies and TV shows in 3D.
How Active 3D Glasses Work
Active 3D glasses are small LCD screens that contain shutters. These shutters dim the right and left lenses at varying times. These glasses are controlled by an emitter in the 3D TV. This emitter tells the glasses when to dim. This way, users can see the intended image at a different depth, helping to show the movie or TV show in 3D.
In order to work, active glasses need batteries, and they are heavier than your typical pair of glasses. Plus, they are only compatible with 3D TVs that were made by the same manufacturer, and they can cost $150-$200 per pair.
How Passive 3D Glasses Work
Passive 3D glasses work similarly to active glasses, but instead of fancy electronic shutters, passive glasses are more subtle. These glasses block different lighting from each eye in order to create the depth illusion.
The problem with passive glasses is that users are not getting an entire 1080p image. Instead, they're actually viewing a resolution that's about half that. The quality will be compromised, and the images will not seem as deep.
Passive glasses are much cheaper than active glasses though, and they can be used with any type of 3D TV, not just the same manufacturer.
3D glasses have come a long way over the years. Though passive still relies on the old lighting method, active glasses embody an innovative shutter to give users a high-quality image. Some people completely advocate for active glasses while other are happy with passive. Either way, 3D TVs wouldn’t be able to exist without them. Soon, though, it won't be a surprise if 3D glasses were obsolete and new 3D contacts came on the market.