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Holographic display element and method of making the same
| Details |
Inventors: Kodama, Daijiro; Watanabe, Masachika;
Assignee: Dai Nippon Printing Co., Ltd. (Tokyo, JP)
Primary Examiner: Dunn; Drew A.
Assistant Examiner: Curtis; Craig
Attorney, Agent or Firm: Dellett & Walters
A holographic display element for three-dimensionally displaying a three-dimensional model and a plane image, for example, in a superimposed manner, which is prevented from causing a change in color or a reduction in contrast of the foreground pattern at an overlap between the foreground pattern and the background pattern. The holographic display element is formed from a single reflection type volume hologram layer, wherein a foreground pattern and a background pattern are recorded so that the two patterns can be reconstructed away from each other in space and a portion of the background pattern that is shadowed by the foreground pattern as superimposed thereover is vacant. |
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DETAILED DESCRIPTION In view of the above-described problems with the prior art, an object of the present invention is to provide a holographic display element for three-dimensionally displaying a three-dimensional model and a plane image, for example, in a superimposed manner, which is prevented from causing a change in color or a reduction in contrast of the foreground pattern at an overlap between the foreground pattern and the background pattern, and also provide a method of making the holographic display element.
To attain the above-described object, the present invention provides a holographic display element formed from a single reflection type volume hologram layer, wherein a foreground pattern and a background pattern are recorded so that the two patterns can be reconstructed away from each other in space, and that a portion of the background pattern that is shadowed by the foreground pattern as superimposed thereover is vacant.
In addition, the present invention provides a holographic display element formed from a single reflection type volume hologram layer, wherein a foreground pattern and a background pattern are recorded so that the two patterns can be reconstructed away from each other in space, and that diffracted light for reconstructing the background pattern will not enter a pattern area of the reconstructed foreground pattern.
In addition, the present invention provides a method of making a holographic display element.
The method includes the steps of making separately a foreground pattern recording intermediate hologram for forming a foreground pattern image and a background pattern recording intermediate hologram for forming a background pattern image, superimposing the foreground pattern recording intermediate hologram and the background pattern recording intermediate hologram over one another, and directing diffracted light from the foreground pattern recording intermediate hologram and diffracted light from the background pattern recording intermediate hologram to enter the same photosensitive material simultaneously, thereby recording a hologram image
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