3D technology is getting bigger day by day and consumer electronics majors are betting big on 3D technology to help drive sales of TVs and other hardware. As we all know these are very costly and apart from this hardware one of the most significant drawbacks is the 3D glasses.
There are active shutter glasses, the dominant glass technology for 3D televisions. They have serious drawbacks like they are relatively expensive and they use batteries that have to be replaced or recharged. There is one more issue with this device that prevent some active shutter glass from being fully compatible.
The problem with this shutter glasses are that they are not so much competitive for living room 3D market. But they are active in exploring a number of alternatives and options. One of the famous approaches can be to move the glass technology into the television itself. This step will allow consumer to use cheaper passive glasses like the kind found in theaters. Some of the companies like RealD and Samsung, they have teamed up to pursue this approach, are calling it RDZ. One better option can be to eliminate the glasses altogether-this step will surely attract considerable interest among hardware vendors.
How glass-free 3D technology works
Many people know about creating a 3D image. It is to display a slightly different version of the image to each eye, such that viewer’s brain will recombine them and perceive depth. There is a technique called alternate-frame sequencing in the active shutter glass; it blocks vision out of one eye and rapidly alternating so that each eye only sees half of the frames. You need a TV with higher refreshing rate of at least 120hz to get this to work. You also need to synchronize the image on the screen with the blocking mechanism in the glass.
Most of the Glasses-free televisions use lenticular lenses to achieve the 3D effect. It works as follows, there are multiple images which will be displayed on the screen at the same time in alternating bands. To see the image bands it has a layer of convex lenses arranged in columns. This technology is almost similar to the holographic images that morph as the viewing angle changes.
It is the lenticular lenses which make it possible to have many separate images at many different angles and not just for each eye. Glasses free 3D environment is significantly depends on this technology. Using this technology, the television will show a pair of images with different perspective at several different viewing angles simultaneously so that everybody on the couch gets the 3D effect.
But there is one problem with this technique i.e. it significantly reduce the resolution of your image. It is due to a lot of horizontal pixels are devoted to showing the two perspective at alternate angles. This is good but poses a dilemma like the television needs to support the 3D effect at many viewing angles in order to make glasses-free 3D practical. But the main problem is the resolution; it degrades as supports for more angles are added.