High quality holographic images have been obtained for still image and holographic animation is also popular. Holography is like a photograph but Electro-holography is based upon the technics of electronics for making and reconstructing the hologram. Holography television is actively researched because 3D TV is becoming much concern for multi-media. Now several research projects are executed and good results are being obtained. In this report research development of Electro-holography is mentioned and is considered about future ability.
Holography is one of suitable methods for displaying true 3D images because it can contain all of informations for human 3D viewing. In this research, on the conventional optical holography system. a CCD camera is usea for reading holographic interference fringe patterns and an LCTV is used for displaying the recorded intereference fringe patterns and thus construct an electro holographic display system. The image quality of the system is not enough for practical applications but the system contains fundamental components for holographic TV.
First discuss the possibility of producing computed holograms in real time. Computation time of generating holographic fringe patterns with a parallel computer CYBERFLOW can be considerably reduced by using some techniques. Then in our experimental system, a three dimensional object can be moved around interactively with using three dimensional pointing device. Synthesis of electro-holograms and opfical holograms can display dynamically moving image on the still precise background. It has high potential to be able to apply currently limited electro-holograms to wide range of applications.
We are researching holographic 3D display using LCD (Liquid Crystal Devices) as a spatial light modulator. We have set up the test display system using three LCDs to obtain wide viewing-area, and evaluated the characteristic of holographic display using LCD. In this paper, we describe the configuration of our test system and considerations about following problems, such as the influence of pixel size to pixel pitch ratio, the blur of non-diffracted light, the aberration or the lens, and the influence of line sequential data addressing.
Our goal is to realize an electro-holographic display for applications such as a 3D TV and a teleconference. However, it is difficult to offer large 3D moving images since a large electro-holographic display requires many calculations to generate holographic data, broad bandwidth of a frame memory and SLMs, and big optical and mechanical parts. To solve these problems, we considered that parallel processing architecture was appropriate for electro-holographic 3D displays. A large holographic display can be composed of multiple small holographic displays. We are now trying to figure out the architecture by electro-holography using acousto-optic modulators (AOMs) as spatial light modulators (SLMs).