JP2006301094A - Three-dimensional display method and three-dimensional display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a three-dimensional display method and a three-dimensional display device by which an observer can observe a three-dimensional stereoscopic picture having no joint even when the observer moves in right-and-left/up-and-down directions with simple configuration, and a derivative phenomenon resulting from adding a side wall image can be prevented. <P>SOLUTION: In the three-dimensional display method for displaying the three-dimensional stereoscopic picture by displaying a plurality of two-dimensional pictures (for example, two-dimensional pictures obtained by sampling a display target object in a depth direction) at different depth positions as seen from the observer, respectively, the side wall image to connect at least part of the two two-dimensional pictures displayed at two adjacent depth positions in the up-and-down/right-and-left directions is displayed between the two adjacent depth positions. The side wall image is formed obliquely as seen from the observer. Furthermore, the light beam direction of the side wall image is restricted and luminance of the side wall image is decreased. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a three-dimensional display method and a three-dimensional display device, and more particularly, a three-dimensional display method capable of observing a seamless three-dimensional stereoscopic image with a simple configuration even when an observer moves in the horizontal and vertical directions. And a three-dimensional display device.

As an apparatus for displaying a three-dimensional stereoscopic image, for example, a volume type method is known. (See Patent Document 1 below)
In this volume type system, as shown in FIG. 10, two-dimensional images (depth sampled images) (132a to 132e) obtained by sampling a three-dimensional object in the depth direction when viewed from the viewer 100 are displayed as, for example, viewers. 3D images are displayed on the display surfaces (131a to 131e) arranged in the depth direction as viewed from 100 respectively.

As prior art documents related to the invention of the present application, there are the following.
Japanese Patent No. 3310157

In the volume type method described above, display surfaces (131a to 131e) in which planar (depth sampled images) display images (depth sampled images) (132a to 132e) are arranged at predetermined intervals. Basically, it is displayed in a stacked manner.
Therefore, there is a problem that the joint is observed when the observer moves in the left / right and up / down directions from the front.
In order to solve the above-described problems, conventionally, an overlap portion is set on the front and rear surfaces in combination with a DFD (Depth-Fused-3D) type three-dimensional display method or the like.
According to this method, the seam is difficult to see when the observer's head is swung, but the seam is still visible when the angle is larger than that.
The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a three-dimensional display method and a three-dimensional display apparatus with a simple configuration, and an observer can move in the horizontal and vertical directions. It is an object of the present invention to provide a technique that enables an observer to observe a seamless three-dimensional stereoscopic image even when moved to.
Another object of the present invention is to provide a technique for preventing a derivation phenomenon due to addition of a side wall image in a three-dimensional display method and a three-dimensional display device.
The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

Of the inventions disclosed in this application, the outline of typical ones will be briefly described as follows.
In order to achieve the above object, the present invention displays a plurality of two-dimensional images (for example, two-dimensional images obtained by sampling a display target object in the depth direction) at different depth positions as viewed from the observer. In the three-dimensional display method for displaying a three-dimensional stereoscopic image, side wall images connecting at least a part in the vertical and horizontal directions of the ends of two two-dimensional images displayed at two adjacent depth positions are adjacent to each other. The display is performed between two depth positions.
In the present invention, the side wall image is formed obliquely as viewed from an observer.
In the present invention, the light beam direction of the side wall image is limited to reduce the luminance of the side wall image.
The present invention also provides a three-dimensional display device that implements the above-described three-dimensional display method.

The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows.
(1) According to the present invention, it is possible for an observer to observe a seamless three-dimensional stereoscopic image with a simple configuration even when the observer moves in the horizontal and vertical directions.
(2) According to the present invention, it is possible to prevent the three-dimensional stereoscopic image observed by the observer from becoming a three-dimensional stereoscopic image in which the side wall image portion is lit abnormally.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In all the drawings for explaining the embodiments, parts having the same functions are given the same reference numerals, and repeated explanation thereof is omitted.
FIG. 1 is a cross-sectional view for explaining the three-dimensional display method of the present invention.
As shown in the figure, also in the three-dimensional display method of the present invention, the laminated image 1 is displayed on, for example, display surfaces (3a, 3b, 3c,...) Arranged in the depth direction when viewed from the observer 100. To display a three-dimensional stereoscopic image. Here, the laminated image 1 is, for example, a two-dimensional image (depth sampled image) obtained by sampling a three-dimensional object in the depth direction when viewed from the observer 100.
The characteristic feature of the present invention is that the end faces of the laminated images 1 are connected by a side wall-like image (hereinafter referred to as a side wall image) 2 having a texture substantially the same as that of the end face portion. . As will be described later, the side wall image 2 is not necessarily vertical as viewed from the observer.
The side wall image 2 may be formed in all of the left and right and up and down directions of the end face of the laminated image 1, but is formed in at least one direction of the left and right and up and down directions of the end face of the laminated image 1. You may make it do.
For example, the side wall image 2 may be provided only in the left-right direction of the end surface of the laminated image 1, and the vertical direction may be surpassed by the conventional overlap method. Further, the present invention and the overlap method are used in combination. May be.
According to the three-dimensional display method of the present invention, it is possible to make the seam difficult to understand, and it is possible to observe from various directions.

Hereinafter, a three-dimensional display device for carrying out the three-dimensional display method of the present invention will be described.
[Example 1]
FIG. 2 is a cross-sectional view illustrating a schematic configuration of the three-dimensional display device according to the first embodiment of the present invention.
In the figure, 10 is a display device, and 20 is a variable focus optical system.
In this embodiment or each embodiment described later, the display device (10, 11) is, for example, a CRT, a liquid crystal display, an LED display, a plasma display, an EL display, an FED display, a DMD, a projection display, or an oscilloscope. A line drawing type display can be used.
The variable focus optical system 20 displays the laminated image 1 displayed on the display device 10 in a time division manner on each display surface (3a, 3b, 3c,...) And at the same time, displays it on the display device 10 in a time division manner. The side wall image 2 is displayed between the display surfaces. The variable focus optical system 20 may be one that continuously changes the focal length or one that changes the focal length discretely. This embodiment has an advantage that the device configuration of the three-dimensional display device is simple.

[Example 2]
FIG. 3 is a cross-sectional view illustrating a schematic configuration of the three-dimensional display device according to the second embodiment of the present invention.
In the figure, 10 and 11 are display devices, 20 and 21 are variable focus optical systems, 30 is a half mirror, and 31 is a mirror.
In the present embodiment, the display device 10 and the variable focus optical system 20 are arranged for the laminated image, and similarly, the display device 11 and the variable focus optical system 21 are arranged for the side wall image. The half mirror 30 and the mirror 31 are combined by an optical system.
The variable focus optical system 20 displays the laminated image 1 displayed on the display device 10 on each display surface (3a, 3b, 3c,...) In a time division manner, and the variable focus optical system 21 displays in a time division manner. The sidewall image 2 displayed on the device 11 is displayed between the display surfaces.
In this embodiment, since the apparatus can be dedicated for the laminated image and the side wall image, it is easy to optimize the parameters, and display is performed as compared with the case where the laminated image 1 and the side wall image 2 are displayed on the same display device. There is an advantage that it is not necessary to speed up the apparatus.
Here, the variable focal length optical system (20, 21) may be one that continuously changes the focal length or one that varies the focal length discretely. However, as the variable focal length optical system 20, the focal length is discrete. When the variable focal length optical system 21 is used and the focal length is continuously varied, the focal length is continuously varied as the variable focal length optical system (20, 21). The image is cleaner than when using something that changes.
Needless to say, it is possible to use a variable focal length optical system (20, 21) in which both focal lengths are discretely changed.

[Example 3]
FIG. 4 is a cross-sectional view illustrating a schematic configuration of a three-dimensional display device according to Embodiment 3 of the present invention.
In this embodiment, the varifocal optical system 20 displays the laminated image 1 displayed on the display device 10 in time division on each display surface (3a, 3b, 3c,...) And at the same time two adjacent depth positions. When the depth position on the observer side is the front surface, a two-dimensional image displayed on the front surface is displayed in time division between two adjacent depth positions.
That is, in this embodiment, the side wall image 2 is not generated, but the laminated image 1 is continuously drawn in the depth direction as it is to form the volume image 4.
This embodiment has an advantage that the device configuration is simplified.

[Example 4]
FIG. 5 is a cross-sectional view showing a schematic configuration of a three-dimensional display device according to Embodiment 4 of the present invention.
In this embodiment, the display device 11 that displays the side wall image 2 is arranged obliquely when viewed from the observer 100. Therefore, in this embodiment, as shown in FIG. 5, the side wall image 2 is generated so as to be oblique as viewed from the observer 100.
In this embodiment, the laminated image 1 displayed on the display device 10 and the side wall image 2 displayed on the display device 11 are combined by the optical system from the half mirror 30 and the mirror 31 and are incident on the variable focus optical system 20. Is done.
The variable focus optical system 20 displays the laminated image 1 displayed on the display device 10 on each display surface (3a, 3b, 3c,...) In a time division manner and is displayed on the display device 11 in a time division manner. The side wall image 2 is displayed between the display surfaces.
Here, the variable focus optical system 20 may be one that continuously changes the focal length or one that changes the focal length discretely.
FIG. 6 is a cross-sectional view illustrating a schematic configuration of a modified example of the three-dimensional display device according to the fourth embodiment of the present invention.
The three-dimensional display device shown in FIG. 6 is different from the three-dimensional display device shown in FIG. 5 in that a variable focus optical system 20 for a laminated image and a variable focus optical system 21 for a side wall image are arranged.
The three-dimensional display device shown in FIG. 6 can be dedicated to the laminated image and the side wall image, so that the parameters can be easily optimized, and the laminated image 1 and the side wall image 2 are displayed on the same display device. Compared to the above, there is an advantage that it is not necessary to increase the speed of the display device.
Here, the variable focus optical system (20, 21) may be one that continuously changes the focal length, or one that changes the focal length discretely, for example, the variable focus optical system (20, 21). As 21), the focal length may be continuously changed, or the focal length may be changed discretely.

[Example 5]
FIG. 7 is a cross-sectional view for explaining a method for preventing a derivation phenomenon due to addition of a sidewall image in the three-dimensional display method of the present invention.
As described above, in the three-dimensional display method of the present invention, the side wall image 2 is in a state of being overlapped as viewed from the observer 100, so the luminance of the side wall image 2 is integrated, and the side wall image 2 portion illuminates strangely. 3D stereoscopic image. This phenomenon becomes more prominent as the laminated image 2 is closer to the vertical as viewed from the observer 100.
In order to prevent this phenomenon, the laminated image 2 is not made vertical when viewed from the observer 100 (hereinafter referred to as method 1), and the light beam direction of the side wall image 2 is changed as shown by the broken line arrow in FIG. There is a method (hereinafter referred to as method 2) that prevents luminance integration by limiting.
As an example of a specific method for realizing Method 1 (hereinafter referred to as a first specific example), as shown in FIGS. 5 and 6, the side wall image display device 11 is viewed from the observer 100. There is a way to arrange them diagonally. This method has the advantages that it can use all the original rays and is simple in construction.
In addition, as another example of the specific method for realizing the above-described method 1 (hereinafter referred to as a second specific example), there is a method of changing the magnification in the depth direction in the optical system that displays the sidewall image 2. This method also has the advantages that all the original light rays can be used and that the configuration is simple.
Furthermore, as another example (hereinafter, a third example) of a specific method for realizing the above-described method 1, in a variable focus optical system that displays the side wall image 2, it is matched with the position in the depth direction of the side wall image 2. In this method, the side wall image 2 is shifted in the horizontal and vertical directions. This method also has the advantage that all the original rays can be used.
Further, the first specific example and the second specific example, or the first specific example and the third specific example may be combined.

As an example of a specific method for realizing the above-described method 2, there is a method of moving a light beam range by mechanically moving an optical system such as a mirror or a lens using a motor or the like. This method also has the advantage that all the original rays can be used.
Further, as another example of a specific method for realizing the above-described method 2, there are methods shown in FIGS. The methods shown in FIGS. 8 and 9 both use a mechanical part, and the method shown in FIG. 8 uses two display devices (here, two transmissive display devices) and uses light from the light source side. Is limited by the mask image 5 displayed on the display device 13, and the light beam range of the side wall image 2 displayed on the display device 11 is effectively limited.
In the method shown in FIG. 9, the display device 13 is arranged on the viewer side, and the light beam range of the side wall image 2 displayed on the display device 11 is effectively limited by the mask image 5 displayed on the display device 13. Is.
Here, in addition to the display device 11 for the side wall image, the display device 10 for displaying the side wall image 2 may be two display devices 10 for displaying the laminated image 1 and the side wall image 2.

In this case, when a liquid crystal display is used as the display device 13 and the laminated image 1 is displayed on the display device 10, the display device 13 passes incident light as it is and displays the sidewall image 2 on the display device 10. May display the mask image 5 on the display device 13.
Both the methods shown in FIGS. 8 and 9 have the advantage that there is no mechanical part and high speed is unnecessary.
As described above, according to the present embodiment, the observer can observe a seamless three-dimensional stereoscopic image with a simple configuration even when the observer moves in the horizontal and vertical directions. At the same time, it is possible to prevent the three-dimensional stereoscopic image observed by the observer from becoming a three-dimensional stereoscopic image in which the side wall image portion is lit abnormally.
As mentioned above, the invention made by the present inventor has been specifically described based on the above embodiments. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Of course.

It is sectional drawing for demonstrating the three-dimensional display method of this invention. It is sectional drawing which shows schematic structure of the three-dimensional display apparatus of Example 1 of this invention. It is sectional drawing which shows schematic structure of the three-dimensional display apparatus of Example 2 of this invention. It is sectional drawing which shows schematic structure of the three-dimensional display apparatus of Example 3 of this invention. It is sectional drawing which shows schematic structure of the three-dimensional display apparatus of Example 4 of this invention. It is sectional drawing which shows schematic structure of the modification of the three-dimensional display apparatus of Example 4 of this invention. FIG. 6 is a cross-sectional view for explaining a method for preventing a derivation phenomenon due to addition of a sidewall image in the three-dimensional display method of the present invention. It is sectional drawing which shows an example of the concrete implementation method for preventing the derivative phenomenon by the side wall image addition shown in FIG. It is sectional drawing which shows the other example of the concrete implementation method for preventing the derivative phenomenon by the side wall image addition shown in FIG. It is a figure for demonstrating the conventional three-dimensional display method of a volume type.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laminated image 2 Side wall image 3a, 3b, 3c, 131a-131e Display surface 4 Volumetric image 5 Mask image 10, 11, 13 Display apparatus 20, 21 Variable focus optical system 30 Half mirror 31 Mirror 100 Viewer 132a-132e Two-dimensional Image (depth sampled image)

Claims (16)

In a three-dimensional display method for displaying a three-dimensional stereoscopic image by displaying a plurality of two-dimensional images at different depth positions as viewed from an observer,
A sidewall image that connects at least a part of the end portions of two two-dimensional images displayed at two adjacent depth positions in the vertical and horizontal directions is displayed between the two adjacent depth positions. 3D display method.   The three-dimensional display method according to claim 1, wherein the side wall image is formed obliquely as viewed from an observer.   3. The three-dimensional display method according to claim 1, wherein a light beam direction of the side wall image is limited to reduce a luminance of the side wall image.   The three-dimensional display method according to any one of claims 1 to 3, wherein the plurality of two-dimensional images are two-dimensional images obtained by sampling a display target object in a depth direction. A display device;
A variable focus optical system disposed on the observer side of the display device,
The variable focus optical system is a three-dimensional display device that displays a three-dimensional stereoscopic image by displaying a plurality of two-dimensional images displayed on the display device in time division at different depth positions as viewed from an observer. There,
The display device displays a side wall image connecting at least a part in the vertical and horizontal directions of the ends of two two-dimensional images displayed at two adjacent depth positions,
The variable focus optical system displays the side wall image displayed on the display device in a time division manner between two adjacent depth positions. A first display device;
A three-dimensional display device comprising a variable focus optical system disposed on an observer side of the first display device,
A second display device for displaying a side wall image connecting at least a part in the vertical and horizontal directions of the ends of two two-dimensional images at two adjacent depth positions;
An optical system that synthesizes a sidewall image displayed on the second display device into a plurality of two-dimensional images displayed on the first display device;
The variable focus optical system displays a plurality of two-dimensional images displayed on the first display device in a time-division manner at different depth positions as viewed from an observer, and displays a three-dimensional stereoscopic image. A three-dimensional display device characterized in that the side wall image displayed on the second display device in a time-sharing manner is displayed between two adjacent depth positions.   7. The variable focus optical system according to claim 5 or 6, wherein when the side wall image is displayed between two adjacent depth positions, the magnification ratio of the side wall image is changed in the depth direction. The three-dimensional display device described.   6. The variable focus optical system according to claim 5, wherein when the side wall image is displayed between two adjacent depth positions, the side wall image is moved vertically and horizontally in the depth direction. 7. A three-dimensional display device according to 6. A first display device;
A first variable focus optical system disposed on the viewer side of the first display device,
The first variable focus optical system displays a plurality of two-dimensional images displayed on the first display device in a time-division manner at different depth positions as viewed from an observer, thereby displaying a three-dimensional stereoscopic image. A three-dimensional display device,
A second display device for displaying a side wall image connecting at least a part in the vertical and horizontal directions of the ends of two two-dimensional images displayed at two adjacent depth positions;
A second variable focus optical system for displaying the side wall image displayed on the second display device in a time-sharing manner between two adjacent depth positions;
A three-dimensional display comprising: an optical system that combines a plurality of two-dimensional images displayed by the first variable focus optical system and a sidewall image displayed by the second variable focus optical system. apparatus. The first variable focus optical system is a discrete variable focus optical system that discretely changes a focal length,
The three-dimensional display device according to claim 9, wherein the second variable focus optical system is a continuous variable focus optical system capable of continuously changing a focal length.   The three-dimensional display device according to any one of claims 6 to 10, wherein the second display device is disposed obliquely as viewed from an observer.   The second variable focus optical system changes an enlargement ratio of the side wall image in a depth direction when displaying the side wall image between two adjacent depth positions. Item 12. The three-dimensional display device according to any one of items 11.   The second variable focus optical system moves the side wall image vertically and horizontally in the depth direction when displaying the side wall image between two adjacent depth positions. The three-dimensional display device according to any one of claims 11 to 11.   The three-dimensional display device according to any one of claims 5 to 11, further comprising a third display device that displays a mask image that limits a light beam direction of the side wall image. A display device;
A variable focus optical system disposed on the observer side of the display device,
The variable focus optical system is a three-dimensional display device that displays a three-dimensional stereoscopic image by displaying a plurality of two-dimensional images displayed on the display device in time division at different depth positions as viewed from an observer. There,
The variable focus optical system displays a two-dimensional image displayed on the front surface between the two adjacent depth positions when the viewer-side depth position is the front surface at the two adjacent depth positions. A three-dimensional display device. The three-dimensional display device according to any one of claims 5 to 15, wherein the plurality of two-dimensional images are two-dimensional images obtained by sampling a display target object in a depth direction.

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