Gradually, the introduction of 3D movies is already dominating the electronic niche as more and more 3D TVs are being manufactured. Since there is no single system that has a universal 3D functionality, you would find out that there are different methods by which you can watch 3D images or pictures on a screen.
Types of 3D Glasses
Generally, it takes the use of 3D glasses to watch 3D TVs since the systems used in the technology are different. The 4 known systems are as follows:
• Active shutter
• Lenticular technology
How 3D Glasses Work
This technology mimics the depth perception of the human eyes to view images that are projected in three dimensions. The eyes are spaced apart, and the image that one sees is a bit different from what the other eye sees. The two different images are combined together in the brain to form one image with the addition of depth.
The same process is involved in the creation of 3D images when watching your 3D film or when you’re viewing a 3D picture. In effect, you’re simultaneously watching 2 images that are slightly different; it is the 3D glasses that blocks out an image from each eye such that your two eyes are viewing 2 different images, though you wouldn’t even see the 2 images in an overlapping manner. They will never appear distinct to your eyes!
A special kind of 3D glasses is required for each system of viewing three dimensional images or pictures.
• Anaglyph 3D requires glasses with red or blue lenses which display 2 images per frame, and each image is processed in a colour such that each eye filters out one image. Nonetheless, the method is old-fashioned.
• Polarisation requires polarised glasses wherein each lens allows 1 image into each eye. In some brands, the left lens allows only the vertical light waves while the right lens allows the horizontal ones. This method is commonly used in cinemas.
• Active shutter requires the use of special battery-powered LCD glasses which can block out alternate images being displayed at a high speed on a flat screen that has a 120Hz refresh rate. This method is new on the market today as some manufacturers like LG and Samsung have begun to develop 3D TVs with this kind of system.
• Lenticular technology is also employed in some TVs. It does not require the use of 3D glasses since the TV screen is developed to create 3D images through the reflection of light at slightly different angles towards the viewer.
As images are displayed to the human eyes in real life, so also the 3D glasses help you to enjoy the sensation of a real world while watching your favourite TV shows or movies. Gradually, this objective is being achieved through the efforts of many manufacturers.