[Introduction] - Types of 3D Display
VOLUMETRIC VS HOLOGRAPHIC VS INTEGRAL
In
traditional “3D” displays, such as in cinema, TV, etc., viewer’s head and eye
movements are very limited this is because they are not Real 3D. Its
essentially showing two showing two 2D images to each eye.
Image
1: Resembling sunglasses, RealD circular polarized glasses are now the standard
for theatrical releases and theme park attractions.
There
are mainly four types of displays that can be constituted as Real 3D displays.
Meaning the display shows three full dimension. They are Volumetric Display,
Holographic Display, Intergral Imaging and Compressive light field displays.
Volumetric Display:
Image
2: VOXON's VX1
These
types of display points of light within a volume. These points of light are
different from traditional pixels hence they are called voxels. The technology
also includes displays in multiple planes which are display planes stacked up.
This is what VOXON’s VX1 uses.
Holographic
Display:
Binocular disparity,
motion parallax, accommodation and convergence are the four mechanisms that a
Holographic display has the ability to provide.
Image
3: 3D Hologram – ACESForce
It
can do so without any special glasses and induces no visual fatigue to the
human eyes.
Intergral
Imaging:
This
technology is similar to holograms because it also has no need for any special
glasses but it achieves a 3D image with the use of arrays of micro lenses in
front of the image. Depending on the viewing angle each lens will show
different part of an image.
Image 4: Integral imaging 3D display - 3DLab@INHA
This
is a bit different to showing 2D image in all directions. It is more like
reproducing 4D light field and as such when viewer moves it exhibits parallax
creating a stereo image.
Compressive
light field displays:
Also known as Tensor
Displays. Compressive light field displays technology uses LCD panels and
compression algorithms.
Image
5: Image credit: MIT Media Lab, Camera Culture Group
Here
is a video for quick run down on this technology:
This
technology is very recent. MIT Media Lab is currently working on a prototype
that makes use of this technology.
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