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3D display

Types of 3D displays

Stereoscopic

Main article: Stereoscopy

Based on the principles of stereopsis, described by Sir Charles Wheatstone in the 1830s, stereoscopic technology uses a separate device for each person viewing the scene to provide a different image to the person's left and right eyes. Examples of this technology include anaglyph images and polarized glasses. Stereoscopic technologies generally involve special spectacles.

Autostereoscopic

Main article: Autostereoscopy

An evolutionary development of stereoscopy, autostereoscopic display technologies use optical trickery at the display, rather than worn by the user, to ensure that each eye sees the appropriate image. They generally allow the user to move their head a certain amount without destroying the illusion of depth. Automultiscopic displays include view-dependent pixels with different intensities and colors based on the viewing angle; this means that a number of different views of the same scene can be seen by moving horizontally around the display. In most automultiscopic displays the change of view is accompanied by the breakdown of the illusion of depth, but some displays exist which can maintain the illusion as the view changes.

This category of display technology includes autostereograms.

Computer-generated holography

Main article: Computer Generated Holography

The hologram is a familiar artifact of the late 20th century, and research into holographic displays has produced devices which are able to create a light field identical to that which would emanate from the original scene, with both horizontal and vertical parallax across a large range of viewing angles. The effect is similar to looking through a window at the scene being reproduced; this may make CGH the most convincing of the 3D display technologies, but as yet the large amounts of calculation required to generate a detailed hologram largely prevent its application outside of the laboratory. Some companies do produce holographic imaging equipment commercially.

Volumetric displays

Main article: Volumetric display

In addition there are volumetric displays, where some physical mechanism is used to display points of light within a volume. Such displays use voxels instead of pixels. Volumetric displays include multiplanar displays, which have multiple display planes stacked up; and rotating panel displays, where a rotating panel sweeps out a volume.

Other technologies have been developed to project light dots in the air above a device. An infrared laser is focused on the destination in space, generating a small bubble of plasma which emits visible light. As of August 2008, the experiments only allow a rate of 100 dots per second. One of the issues which arise with this display system is the use of technologies that could be harmful to human eyes.

Problems

Each of these display technologies can be seen to have limitations, whether the location of the viewer, cumbersome or unsightly equipment or great cost. Overcoming the latter is perhaps the key challenge for the budding 3-dimensional imaging sector. The acquisition of artifact-free 3D images remains difficult. Photographers, videographers, and professionals in the broadcast and movie industry are unfamiliar with the complex setup required to record 3D images. There are currently no guidelines or standards for multi-camera parameters, placement, and post- production processing, as there are for conventional 2D television.

See also

3D television

Autostereoscopy

Computer generated holography

Holography

Lenticular printing

List of emerging technologies

Stereoscopic Displays and Applications (annual conference)

Stereoscopy

Volumetric display

Integral imaging

Free-space display

References

^ Okoshi, Three-Dimensional Imaging Techniques, Academic Press, 1976

^ Holografika, continuous autostereoscopic display manufacturer

^ Zebra Imaging, holography solutions provider

External links

Plasma projection in air

Polaris Sensor Technologies, Inc. 3D Displays

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Display technology

Video

Current generation

Electroluminescent display (ELD)  Vacuum fluorescent display (VFD)  Light emitting diode (LED) display  Cathode ray tube (CRT)  Liquid crystal display (LCD) (TFT  LED backlight)  Plasma display panel (PDP)  3LCD  Digital Light Processing (DLP)  Liquid crystal on silicon (LCOS)

Next generation

Organic light-emitting diode (OLED) (roll-up display  Active-matrix  Phosphorous)  Surface-conduction electron-emitter display (SED)  Field emission display (FED)  Laser TV  Ferro Liquid display (FLD)  Interferometric modulator display (IMOD)  Thick-film dielectric electroluminescent (TDEL)  Nanocrystal display  Quantum dot display (QDLED)  Time-multiplexed optical shutter (TMOS)  Telescopic pixel display (TPD)  Liquid crystal lasers (LCL)  Laser Phosphor Display (LPD)

Non-video

Electromechanical (Flip-dot  Split-flap  Vane)  Electronic paper  Rollable  Eggcrate  Nixie tube

3D display

Stereoscopic  Autostereoscopic  Computer generated holography  Volumetric  Laser beam

Static media

Hologram  Movie projector  Neon sign  Rollsign  Slide projector  Transparency

Related articles

Display examples  Free-space display  Large-screen television technology  Optimum HDTV viewing distance  High dynamic range imaging (HDRI)

Comparison of display technology

Categories: Display technology | 3D imagingHidden categories: Wikipedia articles needing rewrite from March 2009 | Articles to be merged from March 2009 | All articles to be merged | Articles to be merged from September 2009
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