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| Holographic display element and method of making the same |
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| Multiple-resolution scanning device |
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| Optical signal free-space conversion board |
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| Polyhedral integrated and free space optical interconnection |
| OF THE INVENTION FIG. 1 shows a prior art communications system using holographic optical elements.... |
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| Component for optical data transmission |
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| Image processing apparatus |
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Three-dimensional image display device having an elementary hologram panel and method for manufacturing the elementary hologram panel
| Details |
Inventors: Sato, Shunichi; Koide, Koushi;
Assignee: Sharp Kabushiki Kaisha (Osaka, JP)
Primary Examiner: Nguyen; Thong
Assistant Examiner: Treas; Jared
Attorney, Agent or Firm: Dike, Bronstein, Roberts & Cushman, LLP, Conlin; David G.
A three-dimensional image display device capable of displaying a wide screen three-dimensional image which one can easily observe from any position and direction in the same way as viewing an existing object and which device can select display conditions not to allow a three-dimensional image to be semi-transparent, and a method for making said device. Three-dimensional image data includes image data and data on relative positions of each image point (pixel). A screen panel is composed of a plurality of elementary holograms for producing diffracted light for forming each point-image on a three-dimensional image (said elementary hologram is prepared by the method according to the present invention). On the basis of the three-dimensional image data, a control computer controls a modulator and X-Y deflector so that elementary holograms on the screen panel is illuminated one by one with modulated light by raster scanning of a laser light to represent a three-dimensional image composed of point-images. Modulation control is conducted by judging each point-image to be seen and selecting relating elementary holograms to be illuminated. |
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DETAILED DESCRIPTION The present invention relates to a three-dimensional image display device for displaying a three-dimensional object and particularly to a three-dimensional display device which can change a representable image by controlling illuminating light for each of diffraction elements (element holograms) composing a still screen panel to form a three-dimensional image represented by light from the diffraction elements, which can be observed from a wide angle of vision, and a method of preparing elementary holograms for use in the display.
The present invention is directed to provide a three-dimensional image display device which can represent a wide-screen three-dimensional image, form an a three-dimensional image allowing each observer to view from any desired position as if viewing an actually existing object, process hidden lines and points of the formed image and select such displaying conditions that the three-dimensional image may not be semi-transparent and may be used for wider application.
The present invention is also directed to provide a method of easily manufacturing a screen panel to be used in the above-mentioned three-dimensional display device.
Accordingly, an object of the present invention is to provide (1) a three-dimensional image display device which comprises a screen panel, modulated-light generating means for generating coherent light and being capable of designating illuminating places on the screen panel and modulations for the illuminating places, data inputting means for inputting data on three-dimensional image to be displayed and image display control means for controlling the modulated-light generating means according to the three-dimensional image data entered by the data inputting means wherein the screen panel is composed of a plurality of diffraction elements prepared according to data of a three-dimensional image to be displayed, the image display control means controls the modulated-light generating means to illuminate the diffraction elements by modulated coherent light beams respectively so that the light beams effecting respective diffraction elements can represent different point-images depending upon characteristics of the diffraction elements prepared according to the three-dimensional image data, and output light is controlled by control means so that it may be adapted for representing a content of an image with an increased reality of a three-dimensional object
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Optical Systems 
