3D display
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A 3D display is any display device capable of conveying three-dimensional images to the viewer.
There are three types of 3D displays: stereoscopic 3D displays, holographic 3D displays, and multiplanar. Stereoscopic displays use various methods to convey a separate image to each eye, allowing the perception of depth. Holographic displays create a light field which is identical to that which emanated from the original scene, giving a perfect three-dimensional image, although usually only at the particular wavelengths of the lasers used to record the image. 3D displays may use voxels instead of pixels.
[edit] Rotating panel displays
There is a new type of 3D display that is a cross between stereoscopic and holographic. These types of displays consist of a flat LCD display panel that is rotated around its vertical axis. As the display panel spins at a very high speed, at each step of the stepper-motor the screen is updated for that "Slice" of what the image is at that point. The benefit of this technology is an amazing 3D display that is 360-degree viewable. The downside is that the frame data rate is so high that an entire system is required to move that amount of data at such a high speed. For example, a display at 1024 x 768 rotating at 1440 RPM with 1000 virtual display "slices" must move 56,623,104,000(=1024x768x1440/60x1000x3) bytes of data (~52.7 Gigabytes) to the display per second. The bandwidth problem can be relieved somewhat by using a secondary 3D image processor and using various forms of compression, however, as the quality of the display rises the bandwidth needs go up dramatically. Some bandwidth can be saved by only updating the screen within a viewer dependent angle (VDA) - this means that the display uses some form of tracking a single viewer and only the viewing angles the viewer will see it from are sent to the display. This can cut the data rate by two thirds. The final drawback of this type of machine is the fact that it contains moving parts. This makes them more prone to breaking down and a short mean time between failures (MTBF). The first of these monitors was on display at the CES in January 2006. Its MSRP is about $30,000 USD for a 5 inch display inside a glass half sphere.
One working example of a working rotating panel display is Actuality Systems Perspecta 3-D display which generates a 10 inch (25cm) 3-D imagery by projecting a sequence of 2-D slices onto a rapidly rotating display panel enclosed within a semi-spherical transparent display casing. Like most display technologies, persistence of vision is relied upon to meld the radially-distributed slices into a 3-D image.
[edit] Volumetric displays
Volumetric display systems employ voxels for image creation. A typical voxel is cubic in form, although a number of other geometries are possible. To date, the majority of volumetric displays that have been developed give rise to opaque voxels and therefore these display technologies are able to satisfy the depth cue of occlusion in a natural manner.
[edit] External links
| Static | Nixie tube | Split-flap display | Flip-dot display | Electronic paper |
| Video-capable | VFD | CRT | PDP | LED | OLED | Laser TV | LCD | DLP | LCoS | SED | FED | NED Free-space display |
| 3D | Stereoscopic | Volumetric | Holographic |
| Intermittent | Film projection |
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