JP2006215256A - Three-dimensional display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively use a display in a three-dimensional display apparatus of a DFD (depth-fused 3-D) system or a double-face superposition display system. <P>SOLUTION: The three-dimensional display apparatus has a plurality of display screens disposed at positions in different depths observed from an observer, and is equipped with a changing means which changes the display screens between in a state of each display screen superposed with others in the depth direction and in a state of each display screen not superposing in the depth direction but resulting a plurality of independent display screens. The changing means comprises a structure to slide the display screens or a structure to fold the display screens. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a three-dimensional display device, and more particularly, to a technique for effectively utilizing a display in a three-dimensional display device of a DFD (Depth-Fused 3-D) method or a two-surface superimposed display method.

The present inventors have been able to suppress the contradiction between physiological factors of stereoscopic vision, and can easily perform three-dimensional display without using stereoscopic glasses, and the three-dimensional DFD (Depth-Fused3-D) method. A display device has been proposed (see Patent Document 1 and Patent Document 2 below).
The proposed three-dimensional display device described above displays a two-dimensional image on a plurality of display surfaces, and changes the brightness or transparency of the two-dimensional image displayed on the plurality of display surfaces for each display surface. A three-dimensional stereoscopic image is displayed.

As prior art documents related to the invention of the present application, there are the following.
Japanese Patent No. 3022558 Japanese Patent No. 3460671

A conventional 3D display device using a DFD method or a two-sided superimposition display method has a structure in which a plurality of display devices are stacked on the front and back, and when only two-dimensional display is performed, display is performed using only one of the display devices. Therefore, one of the display devices cannot be used for display.
The present invention has been made to solve the problems of the prior art, and an object of the present invention is to provide a display in a three-dimensional display device of a DFD (Depth-Fused3-D) method or a two-surface superimposed display method. It is to provide technology that can be used effectively.
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 provides a three-dimensional display device having a plurality of display surfaces arranged at different depth positions as viewed from an observer, wherein the display surfaces overlap in the depth direction. And changing means for changing the display surfaces into a plurality of independent display surfaces that do not overlap in the depth direction.
In the invention, it is preferable that the changing means has a structure for sliding the display surface or a structure for folding the display surface.

In the present invention, a liquid crystal display panel is used as the display surface, and when the display surfaces are a plurality of independent display surfaces that do not overlap in the depth direction, they are adjacent to the front and rear optical axes of each liquid crystal display panel. Each polarizing plate is present.
In the present invention, a liquid crystal display panel is used as the display surface, and when the display surfaces are overlapped in the depth direction, there are polarizing plates adjacent to each other on the front and rear optical axes of each liquid crystal display panel. It is characterized by doing.
In the present invention, a liquid crystal display panel is used as the display surface. When the display surfaces are overlapped in the depth direction, a plurality of polarizing plates are adjacent to each other on the optical axis in front of the frontmost liquid crystal display panel. And a plurality of polarizing plates exist adjacent to each other on the optical axis behind the rearmost liquid crystal display panel.

The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows.
According to the three-dimensional display device of the present invention, a two-dimensional two-dimensional display device is slid or folded to form a DFD-type or two-side superimposed display-type three-dimensional display device. It can be used effectively.

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.
First, a DFD type three-dimensional display device will be described.
[Example of DFD type 3D display device]
FIG. 9 is a diagram for explaining an example of a DFD type three-dimensional display device.
The three-dimensional display device shown in FIG. 9 sets a plurality of surfaces, for example, display surfaces (151, 152) (the display surface 151 is closer to the observer 150 than the display surface 152) on the front surface of the observer 150. In order to display a plurality of two-dimensional images on the display surfaces (151 and 152), an optical system 153 is constructed using a two-dimensional display device and various optical elements.
Examples of the two-dimensional display device include a CRT, a liquid crystal display, an LED display, a plasma display, an EL display, an FED display, a DMD, a projection display, a line drawing type display such as an oscilloscope, and the like as an optical element. For example, a lens, a total reflection mirror, a partial reflection mirror, a curved mirror, a prism, a polarizing element, a wave plate, or the like is used.
Note that FIG. 9 has the same configuration as that described in the above-mentioned Patent Document 1, and refer to the above-mentioned Patent Document 1 for the method of setting the display surface.
In the three-dimensional display device shown in FIG. 9, as shown in FIG. 10, a three-dimensional object 154 to be presented to the observer 150 is transferred from the line of sight of both eyes of the observer 150 to the display surfaces (151 and 152). A projected image (hereinafter referred to as “2D image”) (155, 156) is generated.
As a method for generating this 2D image, for example, a method using a two-dimensional image obtained by photographing a three-dimensional object 154 with a camera from the viewing direction, a method of combining a plurality of two-dimensional images taken from different directions, or There are various methods such as a computer graphic synthesis technique and a method using modeling.

As shown in FIG. 9, the 2D image (155, 156) overlaps both the display surface 151 and the display surface 152 as seen from one point on the line connecting the right eye and the left eye of the observer 150. To display. This can be achieved, for example, by controlling the arrangement of the center position and the gravity center position of each 2D image (155, 156) and the enlargement / reduction of each image.
On the apparatus having such a configuration, the luminance of each of the 2D images (155, 156) is changed in accordance with the depth position of the three-dimensional object 154 while keeping the overall luminance viewed from the observer 150 constant. Thus, a three-dimensional stereoscopic image of the three-dimensional object 154 is displayed.
An example of how to change the brightness of each of the 2D images (155, 156) will be described. Here, since it is a black and white drawing, for the sake of easy understanding, in the following drawings, the higher luminance is shown darker.
For example, when the three-dimensional object 154 is on the display surface 151, as shown in FIG. The brightness of the converted image 156 is zero.
Next, for example, when the three-dimensional object 154 is slightly away from the viewer 150 and slightly closer to the display surface 152 than the display surface 151, the brightness of the 2D image 155 is increased as shown in FIG. Slightly lower and slightly increase the brightness of the 2D image 156.

Next, for example, when the three-dimensional object 154 is further away from the observer 150 and is further away from the display surface 151 toward the display surface 152, the luminance of the 2D image 155 is increased as shown in FIG. Further down, the brightness of the 2D image 156 is further increased.
Further, for example, when the three-dimensional object 154 is on the display surface 152, the luminance of the 2D image 156 on the display surface 152 is made equal to the luminance of the three-dimensional object 154 as shown in FIG. The luminance of the 2D image 155 is zero.
By displaying in this way, even if the 2D image (155, 156) is displayed due to the physiological or psychological factors or illusion of the observer (person) 100, the observer 150 will feel as if It feels as if the three-dimensional object 154 is located in the middle of the display surface (151, 152).
For example, when a 2D image (155, 156) with substantially equal luminance is displayed on the display surface (151, 152), the three-dimensional object 154 appears near the middle of the depth position of the display surface (151, 152). I can feel it. In this case, the three-dimensional object 154 is perceived by the observer 150 with a stereoscopic effect.

In the above description, for example, the method of expressing the depth position of the entire three-dimensional object using, for example, a two-dimensional image displayed on the display surface (151, 152) has been described. It is obvious that the 3D display device can be used as a method of expressing the depth of the 3D object itself, for example.
An important point in expressing the depth of the three-dimensional object itself is that the luminance of each part of the 2D image (155, 156) is viewed from the observer 150 on the apparatus having the configuration shown in FIG. It is to change corresponding to the depth position of each part of the three-dimensional object 154 while keeping the overall luminance constant.
In the above description, the description has been given of the case where only two surfaces are mainly described among the surfaces on which the two-dimensional image is arranged, and the object to be presented to the observer is between the two surfaces. It is obvious that a three-dimensional stereoscopic image can be displayed by a similar method even when the number of surfaces on which images are arranged is larger than this or when the position of an object to be presented is different.
For example, there are three surfaces, a first three-dimensional object between the surface close to the observer 150 and the intermediate surface, and a second 3 between the intermediate surface and the surface far from the observer 150. When a three-dimensional object exists, a 2D image of the first three-dimensional object is displayed on a surface close to the observer 150 and an intermediate surface, and on the intermediate surface and a surface far from the observer 150. By displaying the 2D image of the second 3D object, it is possible to display 3D images of the first and second 3D objects.

Furthermore, regarding the case where the 2D image is moved three-dimensionally, the movement of the observer in the horizontal and vertical directions can be achieved by moving image reproduction on the display surface as in the case of a normal two-dimensional display device. Regarding the movement in the depth direction, the luminance of each of the 2D images (155, 156) is changed with time in the depth position of the three-dimensional stereoscopic image while keeping the overall luminance seen from the observer 150 constant. It is clear that a moving image of a three-dimensional image can be expressed by changing it correspondingly.
For example, a case where a three-dimensional stereoscopic image moves from the display surface 151 to the display surface 152 in time will be described.
When the three-dimensional stereoscopic image is on the display surface 151, as shown in FIG. 11, the luminance of the 2D image 155 on the display surface 151 is made equal to the luminance of the three-dimensional stereoscopic image, and 2D on the display surface 152 is displayed. The brightness of the converted image 156 is zero.
Next, for example, when the three-dimensional stereoscopic image gradually moves away slightly from the observer 150 in time and approaches the display surface 152 from the display surface 151 in time, as shown in FIG. Corresponding to the movement of the depth position of the three-dimensional stereoscopic image, the luminance of the 2D image 155 is slightly lowered in time, and the luminance of the 2D image 156 is slightly increased in time.

Next, for example, when the three-dimensional stereoscopic image is further distant from the observer 150 in time and moved to a position closer to the display surface 152 than the display surface 151, as shown in FIG. Corresponding to the movement of the depth position of the three-dimensional stereoscopic image, the brightness of the 2D image 155 is further lowered in time, and the brightness of the 2D image 156 is further raised in time.
Further, for example, when the three-dimensional stereoscopic image has moved to the display surface 152 in time, as shown in FIG. 14, the 2D image above this corresponding to the movement of the depth position of the three-dimensional stereoscopic image. The luminance of 156 is changed with time until it becomes equal to the luminance of the three-dimensional stereoscopic image, and is changed until the luminance of the 2D image 155 on the display surface 151 becomes zero.
By displaying in this way, even if a 2D image (155, 156) is displayed due to a human physiological or psychological factor or illusion, the viewer 150 is as if the display surface (151, 152), it is felt that the three-dimensional stereoscopic image moves from the display surface 151 to the display surface 152 in the depth direction.

In the above description, the case where the three-dimensional stereoscopic image moves from the display surface 151 to the display surface 152 has been described. However, this moves from the halfway position between the display surfaces (151 and 152) to the display surface 152. In the case of moving to a depth position in the middle between the display surface 151 and the display surface (151, 152), or from the depth position in the middle between the display surfaces (151, 152) of the display surface (151, 152). It is clear that the same can be done even when moving to another depth position in the middle.
In the above description, a description is given of the case where only two surfaces are mainly described among the surfaces on which the 2D image is arranged, and the three-dimensional stereoscopic image presented to the observer 150 moves between the two surfaces. However, even if the number of planes on which a two-dimensional image is arranged is larger than this, or even when a three-dimensional object to be presented moves across multiple planes, a three-dimensional stereoscopic image is displayed using the same method. Obviously, similar effects can be expected.
In the above description, the case where one three-dimensional stereoscopic image moves in two planes on which two-dimensional images are arranged has been described. However, when a plurality of three-dimensional objects move, that is, displayed. When the two-dimensional image includes a plurality of object images having different movement directions, the luminance of the object image displayed on each display surface changes for each object image according to the movement direction and movement speed of the object. Obviously, you can do that.

[Example 1]
FIG. 1 is a diagram illustrating a schematic configuration of a three-dimensional display device according to a first embodiment of the present invention.
In this embodiment, a liquid crystal display panel (hereinafter referred to as an LCD panel) 100 and an LCD panel 101 are arranged as display surfaces for the front and rear surfaces. In addition, polarizing plates (120, 121) with the polarization axes orthogonal are arranged on both surfaces of the LCD panel 100, and polarizing plates (122, 123) with the polarization axes orthogonal are arranged on both surfaces of the LCD panel 101.
At this time, the polarizing plate 121 and the polarizing plate 122 positioned between the LCD panel 100 and the LCD panel 101 are aligned in the direction of the polarization axis.
On the back surface, two backlights of a backlight 110 and a backlight 111 are arranged so as to overlap each other. That is, in order to improve a decrease in luminance due to an increase in the number of LCD panels, a backlight is stacked to increase the luminance.
Here, the backlight 110 is assumed to have a transmissive structure capable of transmitting light from the back surface. As the transmissive backlight, a light guide plate type backlight (also referred to as a sidelight type backlight) having a structure in which a light source disposed on a side surface is reflected by the light guide plate can be used.
As shown in FIG. 1, when an image is displayed in a state where all are overlapped, the above-described DFD type three-dimensional display device that performs three-dimensional display by changing the transparency of two front and rear surfaces, or individual images in the depth direction It becomes a three-dimensional display device of a two-sided superimposition display method that is superimposed on.

As shown in FIG. 2, the LCD panel 101, the polarizing plate (horizontal) 122, the polarizing plate (vertical) 123, and the backlight 110 are slid to a place where they do not overlap from the state in which they all overlap. Each of the panels 101 has a configuration similar to that of a conventional LCD display, and can be used as an independent two-sided normal two-dimensional display device.
The backlight 110 does not use a transmissive backlight, but uses a non-transparent normal backlight. In three-dimensional display, the luminance is increased by only one backlight, and the two-dimensional display is improved. In some cases, the configuration of reducing the luminance of the backlight or performing bright two-dimensional display is also conceivable.
In addition, as shown in FIG. 3, when sliding to a state where the overlapping part remains without being completely slid, the overlapping part becomes a three-dimensional display device of the DFD method or the two-surface superimposed display method, Other portions can be used as an independent two-dimensional display device.
By adopting such a sliding configuration, for example, it can be applied to a display of a portable terminal such as a mobile phone or a portable game machine in which a display is mounted in a limited space. In the case of not performing two-dimensional display, it is possible to perform two-dimensional display by developing the two surfaces in a planar manner, and the two-surface display device can be effectively used.
Although this embodiment has been described with an example using an LCD panel, a polarizing plate is not necessary in the case of a transparent display (such as an LED device) using another method that does not use polarized light.

[Example 2]
FIG. 4 is a diagram illustrating a schematic configuration of the three-dimensional display device according to the second embodiment of the present invention.
Also in the present embodiment, the LCD panel 200 and the LCD panel 201 are arranged as the front and rear display surfaces, and two polarizing plates (220 having the same polarization axis direction are arranged on the front surface of the front LCD panel 200. , 221) and two polarizing plates (222, 223) having the same polarization axis are arranged on the rear surface of the LCD panel 201 on the rear surface.
At this time, the directions of the polarization axes of the two polarizing plates (220, 221) located on the front surface of the LCD panel 200 and the polarization axes of the two polarizing plates (222, 223) located on the rear surface of the LCD panel 201 are shown. Make the direction orthogonal.
On the back surface, two backlights of a backlight 210 and a backlight 211 are arranged so as to overlap each other. That is, in order to improve a decrease in luminance due to an increase in the number of LCD panels, a backlight is stacked to increase the luminance.
Here, the backlight 210 is assumed to have a transmissive structure capable of transmitting light from the back surface. As the transmissive backlight, a light guide plate type backlight having a structure in which a light source disposed on a side surface is reflected by the light guide plate, or the like can be used.
As shown in FIG. 4, when an image is displayed in a state where all are overlapped, the above-mentioned DFD 3D display device that performs three-dimensional display by changing the transparency of the front and rear two surfaces, or individual images in the depth direction It becomes a three-dimensional display device of a two-sided superimposition display method that is superimposed on.

As shown in FIG. 5, the LCD panel 200, the polarizing plate (vertical) 221, the polarizing plate (horizontal) 223, and the backlight 210 are slid to a place where they do not overlap from the state in which they all overlap. Each of the panels 201 has the same configuration as a conventional LCD display, and can be used as an independent two-sided normal two-dimensional display device.
In addition, as shown in FIG. 6, when sliding to a state where the overlapping part remains without being completely slid, the overlapping part becomes a three-dimensional display device of the DFD method or the two-sided superposition display method, Other portions can be used as an independent two-dimensional display device.
The backlight 210 uses a normal backlight that does not use a transmissive backlight, increases the brightness with only one backlight for three-dimensional display, and backlight for two-dimensional display. It is also conceivable to reduce the brightness of the display or to perform bright two-dimensional display.
By adopting such a sliding configuration, for example, it can be applied to a display of a portable terminal such as a mobile phone or a portable game machine in which a display is mounted in a limited space. In the case of not performing two-dimensional display, it is possible to perform two-dimensional display by developing the two surfaces in a planar manner, and the two-surface display can be effectively used.
Although this embodiment has been described with an example using an LCD panel, a polarizing plate is not necessary in the case of a transparent display (such as an LED device) using another method that does not use polarized light.

[Example 3]
FIG. 7 is a diagram showing a schematic configuration of a three-dimensional display device according to Embodiment 3 of the present invention.
Also in the present embodiment, the LCD panel 300 and the LCD panel 301 are disposed as the display surfaces for the front and rear surfaces, and polarizing plates (320, 321) having polarization axes orthogonal to the both surfaces of the LCD panel 300 are disposed. Polarizing plates (322, 323) with the polarization axes orthogonal are arranged on both sides of the panel 301.
At this time, the polarizing plates are arranged so that the polarizing axes of the polarizing plates 321 and 322 positioned between the LCD panel 300 and the LCD panel 301 are aligned.
On the back surface, two backlights of a backlight 310 and a backlight 311 are arranged so as to overlap each other. That is, in order to improve a decrease in luminance due to an increase in the number of LCD panels, a backlight is stacked to increase the luminance.
The backlight 310 has a transmissive structure that can also transmit light from the back surface. As the transmissive backlight, a light guide plate type backlight having a structure in which a light source disposed on a side surface is reflected by the light guide plate, or the like can be used.
As shown in FIG. 7, when an image is displayed in a state where all are overlapped, the above-described DFD type three-dimensional display device that performs three-dimensional display by changing the transparency of the two front and rear surfaces, or individual images in the depth direction It becomes a three-dimensional display device of a two-sided superimposition display method that is superimposed on.

As shown in FIG. 8, the LCD panel 300, the polarizing plate (vertical) 320, the polarizing plate (horizontal) 321, and the backlight 311 are opened around the rotation axis from the state in which they all overlap (folded state). Each of the LCD panel 300 and the LCD panel 301 has the same configuration as a conventional LCD display, and can be used as an independent two-sided normal two-dimensional display device.
In this embodiment, the backlight may be slid and unfolded in the same manner as in Embodiments 1 and 2 described above, except that the backlight is unfolded by rotating around the rotation axis.
In addition, the backlight 310 uses a normal backlight that does not use a transmissive backlight, increases the luminance with only one backlight during three-dimensional display, and increases the luminance during two-dimensional display. A configuration in which the luminance of the backlight is reduced or bright two-dimensional display is performed is also conceivable.
By adopting such a folding configuration, for example, it can be applied to a display of a portable terminal such as a foldable mobile phone or a portable game machine in which a display is mounted in a limited space. In the case where the dimensional display is not performed, it is possible to develop the two planes in a two-dimensional manner and perform the two-dimensional display with a double area, and the two-plane display device can be effectively used.
Although this embodiment has been described with an example using an LCD panel, a polarizing plate is not necessary in the case of a transparent display (such as an LED device) using another method that does not use polarized light.
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 a figure which shows schematic structure of the three-dimensional display apparatus of Example 1 of this invention. It is a figure which shows an example of the state which expand | deployed one LCD panel from the state shown in FIG. It is a figure which shows the other example of the state which expand | deployed one LCD panel from the state shown in FIG. It is a figure which shows schematic structure of the three-dimensional display apparatus of Example 2 of this invention. It is a figure which shows an example of the state which expand | deployed one LCD panel from the state shown in FIG. It is a figure which shows the other example of the state which expand | deployed one LCD panel from the state shown in FIG. It is a figure which shows schematic structure of the three-dimensional display apparatus of Example 3 of this invention. It is a figure which shows an example of the state which expand | deployed one LCD panel from the state shown in FIG. It is a figure which shows schematic structure of the three-dimensional display apparatus used as the basis of this invention. It is a figure for demonstrating the production | generation method of the 2D-ized image displayed on each display surface in the three-dimensional display apparatus used as the foundation of this invention. It is a figure for demonstrating the display principle of the three-dimensional display apparatus used as the basis of this invention. It is a figure for demonstrating the display principle of the three-dimensional display apparatus used as the basis of this invention. It is a figure for demonstrating the display principle of the three-dimensional display apparatus used as the basis of this invention. It is a figure for demonstrating the display principle of the three-dimensional display apparatus used as the basis of this invention.

Explanation of symbols

100, 101, 200, 201, 300, 301 Liquid crystal display panel (LCD panel)
110, 111, 210, 211, 310, 311 Backlight 120, 121, 122, 123, 220, 221, 222, 223, 320, 321, 322, 323 Polarizing plate 150 Viewer 151, 152 Display surface 153 Optical system 154 3D object 155, 156 2D image

Claims (7)

A three-dimensional display device having a plurality of display surfaces arranged at different depth positions as viewed from an observer,
Changing means for changing the display surfaces to a state in which the display surfaces overlap each other in the depth direction when viewed from the observer and a state in which the display surfaces are not overlapped in the depth direction and become a plurality of independent display surfaces as viewed from the observer. A three-dimensional display device comprising:   The three-dimensional display device according to claim 1, wherein the changing unit is configured to slide a display surface.   The three-dimensional display device according to claim 1, wherein the changing unit has a structure in which a display surface is folded.   When a liquid crystal display panel is used as the display surface and each of the display surfaces becomes a plurality of independent display surfaces without overlapping in the depth direction, each polarizing plate is adjacent to the front and rear optical axes of each liquid crystal display panel. The three-dimensional display device according to claim 2, wherein the three-dimensional display device exists.   A liquid crystal display panel is used as the display surface, and when the display surfaces are overlapped in the depth direction, there are polarizing plates adjacent to each other on the front and rear optical axes of each liquid crystal display panel. The three-dimensional display device according to claim 2 or claim 3.   When a liquid crystal display panel is used as the display surface and the display surfaces are overlapped in the depth direction, there are a plurality of polarizing plates adjacent to the front optical axis of the frontmost liquid crystal display panel, and the last surface 4. The three-dimensional display device according to claim 2, wherein a plurality of polarizing plates exist adjacently on the optical axis behind the liquid crystal display panel.   A plurality of two-dimensional images obtained by projecting the display target object onto the plurality of display surfaces from the viewing direction of the observer are respectively displayed on the plurality of display surfaces, and the brightness or transmittance of the displayed two-dimensional image is displayed. The three-dimensional display device according to any one of claims 1 to 6, wherein a three-dimensional image is displayed by changing each of the display surfaces independently.

Images