There are a lot of ways to achieve a 3D
display. Most of them are based on a simple principal - display
a different image to each eye, and so create the illusion of a
3D image (this is called stereoscopy).
3D have been
around for ages - we all remember seeing 3D TV programs years
ago. But the new breed of 3D displays and TVs is much better.
Continue reading to learn why...
In the old days (Anaglyph 3D)
the easiest way to make 3D images is to separate the right and left
image using colors. The image has two color "layers", and you separate
the layers using glasses that has blue/red lenses (or cellophane paper,
in the cheapest glasses). This is called Anaglyph 3D, it's cheap and
easy to do as you don't need a new TV and the glasses are very cheap.
The problem is that you lose colors in the image. It simply looks bad.
Polarized (passive) 3D
Polarized 3D uses a polarizing filter on the image so the left and right
images each has a different polarization. You use passive glasses that
filter the right image for each eye. This technique is popular in the
cinemas using two synchronized projectors. Making a polarized 3D LCD
panel is not easy as the LCD already has a polarizing filter, and you
lose half the resolution, but it is possible. LG for example seems to be
better on polarized LCDs as their leading 3D technology. One of the
advantages of passive glasses is that they are very cheap (around $1.5
new breed of 3D TVs and projectors make use of a simple idea - you
display images for the left and right eye alternatively - once the image
for the left eye, and once for the right. Now all you have to do is wear
glasses that block each eye in sync with the display, and you get 3D.
Active Shutter 3D glasses main advantage is that the image looks great -
just as they look in 2D on the same display.
Active-3D is costly, though. The display must refresh the screen fast
enough - at least 60Hz for each eye, which means 120Hz for the display
itself. The glasses are also expensive (over $100 usually) - they have
to include 2 LCDs, and batteries. And you also has to synchronize the
display to the glasses (usually using Infra-red).
In short - you must get a new TV (or projector) that supports
active-shutter glasses. It is projected that within a few years, most
TVs on the market will support this new 3D technology, and most TV
makers (including Sony, Samsung, LG, Toshiba, JVC and Panasonic) have
already selling high-end models that are 3D-enabled.
No-glasses 3D (Auto-Stereoscopic)
Auto-Stereoscopic displays display different pixels to each eye, using
optics (lenses or barriers) to direct the correct pixels to each eye.
The nice part is that you don't need to wear any glasses to experience
the 3D image! But there are many problems with these new kinds of
technologies. Basically there is just one location you can be in order
to view the 3D correctly (just one viewpoint). You can add more
viewpoints, but each viewpoint actually requires two 'dedicated
display'. This means that if you want 10 places from which you can view
the 3D, you need to be able to produce 20 sets of displays - that's a
lot of pixels. Another issue is that the display is always in 3D. You
can't view a 2D image. There are some solutions to that, too (for
example Sharp is using 2 sets of LCD layers - one for 3D and one for 2D,
and you can turn off the one you do not want to use).
These technologies are starting to appear now commercially, but don't
hold your breath for a 3D TV for home use that will not require glasses
- it will probably take a few years as the technology is very costly
currently, is usually limited in the number of 'viewpoints' it provides
and the quality isn't as good as polarized or active-shutter 3D...
Volumetric displays: real 3D images
The most straightforward way to create a 3D display, is to actually
creating it in 3D. These are called Volumetric displays, and scientists
are working on all sorts of way to create them, which usually involves
lasers and rotating or vibrating mirrors. A couple of years ago
researchers create a volumetric display using a mirror that is rotating
very very fast, and a projector that projects an image on it... this
creates a 3D image that you can view all around (360 degrees). There was
actually a prototype display built on this principle:
Obviously, you have to shoot content in 3D if you want to view it in a
3D TV (although there are technology that takes a 2D film and turns it
into 3D). Basically you have to shoot the same scene from 2 cameras, and
make sure that they are in sync and have a fixed distance between them.
Several companies are working on professional 3D movie cameras, that
have 2 lenses built-in in the same camera, which obviously makes
Back in 2009 Fujifilm released the first 'home' digital
camera that can shoot photos in 3D. We hope that more companies will
follow suit, and shooting 3D photos and movies will be easier and more