Information Technology Reference
In-Depth Information
Fig. 10
2D image + depth + occluded image + occluded depth. Image courtesy of Philips
Electronics N.V.
As a general rule for multi-view systems, the resolution seen in a direction is
equal to the native resolution of the underlying display panel divided by the num-
ber of views.
4 Volumetric Displays
Volumetric displays use a media positioned or moved in space on which they pro-
ject/reflect light beams so they are scattered/reflected from that point of space.
The media used is generally a semi-transparent or diffuse surface. Among volu-
metric displays there are exotic solutions like the laser induced plasma explosions
[46]. In general they are less conform to displaying conventions and in most cases
follow the “looking into” instead of “looking out” philosophy.
One possible solution is a moving screen on which different perspectives of the
3D object are projected. A well known solution [47] is a lightweight screen sheet
that is rotated at very high speed in a protecting globe and the light beams from a
DLP microdisplay are projected onto it. Such a display is shown in Fig. 11. Em-
ploying proper synchronization it is possible to see 3D objects in the globe [48].
Such systems can be considered time-multiplexing solutions, where number of the
displayable layers or voxels is determined by the speed of the projection compo-
nent. A similar solution is the usage of rotated LED arrays as the emissive coun-
terpart of the reflective moving media.
Another technique in volumetric display technology is using two or more LCD
layers as a projection screen, creating the vision of depth. Deep Video Imaging
and PureDepth [49] produced a display consisting two LCDs. The depth resolution
