The research of “Universal communication” began to start in NICT from 2006, and the research theme
“Ultra-realistic communication” was covered in this research fi eld. The glassless 200 inch screen size
stereoscopic display is one of developed displays in this research theme. The main parameters of this
display are 200 inch screen size (4.5 mH × 2.5 mV), aspect ratio 16 : 9, the number of image 50 over, the
angle of visibility area 13 degree and the width of visibility area 1.3 m. These parameters were derived
from the results of previously developed glassless 70 inch multi-view stereoscopic display. The glassless
200 inch multi-view stereoscopic display has many superior performances, which are HDTV image
quality, high density view points, a large area screen and so on. This display has a possibility to adapt to
the high-end digital signage and the industrial design tool for these features.
Since electronic holography has the potential to display natural 3D motion images of the highest quality,
it is expected to be the future’s ultimate 3D video system. However, many difficult problems remain
before such a practical system can be realized. The principle and the advantages of 3D image display by
holography and the realization problems of an electronic holography video system are reviewed. The
viewing-zone angle and display size problems are crucial. To solve those problems, NICT has recently
developed an experimental electronic holography 3D display system with ultra high definition display
devices as spatial light modulators and enlargement technology of the viewing-zone angle. The system
has a wide 15 ° viewing-zone angle and a 4-cm-diagonal display size. These performances are currently
the state of the art in electronic holography. Finally, we describe some future prospects for electronic
Techniques for creating large-scale computer holograms whose number of pixels exceeds several billions
pixels is described. The fields of virtual objects are calculated employing a technique called the
polygon-based method that numerically produces the fields of the polygonal surface sources of light.
The silhouette method that shields light behind the objects is also used to remove hidden surfaces and
reconstruct occluded three-dimensional (3D) scenes. The calculated fields of virtual 3D scenes are
numerically interfered with a reference wave, and the created binary fringe pattern is printed using a
commercially available, laser lithography system. The computer holograms created by these techniques
yield almost all depth cues without any additional equipment such as glasses and give viewers a strong
sensation of depth that has never been achieved by conventional 3D systems.
Recently, with need for displays which are capable of creating dynamic holographic images, various
approaches to reach such holographic imaging have been explored, but many technical issues still need
to be overcome and breakthrough. We have been engaged in the development of materials from the
viewpoint of novel and refreshable recording materials. We particularly focused on organic polymerbased
photorefractive (PR) materials which are inexpensive to produce and easy to fabricate large area
display medium. Here we describe a new holographic 3D display based on a novel PR material capable
of refreshing images based on both CW and Pulsed laser holographic recording techniques. We also
demonstrated multi-color capability by using angular multiplexing, full-parallax image, and “Telepresence”
approaches. Thus, new type of hologram medium and system can be expected to accelerate
unprecedented 3D imagery system.
LCOS (Liquid Crystal On Silicon) devices enables both small size and fine pitch density on a small chip.
This paper covers 4.8 micron pixel pitch LCOS device for holographic display, which has a special
designed Silicon Back Plane and Liquid crystal.
A viewing-zone control technique has been realized by use of polarization modulation. This paper
reviews fundamentals of polarization encryptions by use of retarder fi lms and their application for the
viewing-zone control of an information display. Optical encryption with two shared patterns enables
secure display, which prevents eavesdropping of a displayed information and peeping at the decoded
result. Optical encryption with stacking position as an additional key enables dual-view display, which
provide two different displayed images without decreasing of image resolution. Thus, a multi-functional
information display can be realized by renewing spatial codes for polarization modulation.
A three-dimensional display system is presented that uses phase-only distribution calculated from
polygon-based computer graphics (CG) data. For achieving a wide viewing zone, we use a time-sharing
reconstruction at different directions where the angle step is the same as the maximum diffraction angle
of a display panel. Phase-only data at each direction are calculated by the optical wave propagation of
the polygon data from the CG and the transformation of the coordinates from a polygon data space to a
display space. The numerical and experimental results showed that a viewing zone angle of 40 ° was
achieved. By adding a random phase distribution in the polygon data, binary phase distribution can
reconstruct 3D objects as well as multi-level phase distribution.