JP2002228974A - Stereoscopic image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stereoscopic image display device which displays stereoscopic images by removing or decreasing color moires. SOLUTION: This stereoscopic image display device has a display element group 3 to display the element images of a photographed subject and a lens group 5 disposed on the display surface side of the display element group 3 and displays the stereoscopic images from the element images of the subject. The device has a space filter 7 which enlarges and mixes the respective primary colors of one pixel constituting the element images of the subject between the display element group 3 and the lens group 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional image display device for displaying a three-dimensional image by removing or reducing color moire generated when displaying a three-dimensional image.

[0002]

2. Description of the Related Art In general, as one of stereoscopic television systems capable of freely viewing a stereoscopic image from an arbitrary viewpoint, an IP (Integral Photograph) using a convex lens group or a pinhole group arranged in a plane.
phy) are known. This IP will be described with reference to FIGS.

[0005] FIG. 9 is an explanatory diagram schematically illustrating the conventional method of capturing an element image of a subject in an IP. FIG.
FIG. 3 is an explanatory diagram schematically illustrating reproduction of a stereoscopic image based on an element image of a subject in a conventional IP.

As shown in FIG. 9, in the conventional IP, a lens group 103 composed of a plurality of convex lenses (hereinafter, each convex lens is referred to as an element lens) arranged on the same plane is used. A photographic film 105 is disposed on the photographic film 105, and element images of the subject 101, which are inverted images of the subject 101 via the lens group 103, are photographed by the number of element lenses.

[0005] As shown in FIG. 10, a photographic film 107 obtained by developing the photographic film 105 shown in FIG.
When the observer 109 observes through the lens group 103,
A three-dimensional image 111 can be seen.

Here, instead of the photographic film 105, an element image of the subject 101 is photographed using an image pickup device for a television camera, and an electronic display device such as an LCD or EL is used instead of the developed photographic film 107. Display device)
In the case of displaying a stereoscopic image using, it is possible to capture and display a moving image.

FIG. 11 is an explanatory view from the side of the display device when an electronic display element (display device) is used in place of the developed photographic film 107. This FIG.
As shown in the figure, on the display surface 113a side of the display device 113,
The lens group 103 including a plurality of element lenses is arranged so as to be parallel to the display surface 113a.
In a, an element image of the subject 101 is displayed. 1
One element image corresponds to one element lens.

FIGS. 12 and 13 are explanatory views as viewed from the display surface 113a side of the display device 113 shown in FIG. 11, that is, from the front side where the lens group 103 is arranged.
As shown in FIG. 12, the element lenses of the lens group 103 are arranged in a square lattice. Alternatively, as shown in FIG. 13, the element lenses of the lens group 103 are arranged in a bale-stacked form, that is, in a line offset form.

The three-dimensional image obtained through the lens group 103 uses a convex lens as an element lens.
In this state, a pseudo three-dimensional image with inverted depth is obtained. For this reason, a three-dimensional image having a correct depth can be obtained by performing point-symmetric conversion using the center of each elemental image as the center of point symmetry by a separate means.

FIG. 14 is an explanatory diagram schematically showing one pixel obtained by enlarging an element image displayed on the display device 113. As shown in FIG. 14, the display device 113 generally displays a single pixel composed of three small display areas (hereinafter, referred to as dots) by combining three primary colors of red, blue, and green. The display has been made.

[0011]

However, when a three-dimensional image is displayed by the conventional display device 113,
As shown in FIG. 15, the eyes of an observer who observes the display device 113 may observe only one dot via each element lens. As a result, as shown in FIG. 16, the observer has a problem that each dot is observed independently, and the colors of red, blue, and green are not mixed, but appear as separated moire. .

It is an object of the present invention to provide a stereoscopic image display device which solves the above-mentioned problems of the prior art and removes or reduces color moiré and displays a stereoscopic image.

[0013]

According to the first aspect of the present invention, there is provided a three-dimensional image display device, comprising: a display element group for displaying a captured element image of a subject; and a lens provided on the display surface side of the display element group. In a three-dimensional image display device comprising a group and displaying a three-dimensional image from the element image of the subject, between the display element group and the lens group, each primary color of one pixel constituting the element image of the subject is enlarged, It is characterized by having a spatial filter for mixing.

According to this configuration, the spatial filter forms the element image displayed on the display element group.
Each primary color of a pixel is enlarged, and each primary color in one pixel is overlapped and mixed on this spatial filter.

According to a third aspect of the present invention, there is provided a three-dimensional image display apparatus according to the first aspect,
A diffusion plate is provided as the spatial filter, and the diffusion plate is provided at a predetermined distance from the display element group.

According to this structure, the light emitted from the display element group is enlarged by the diffusion plate provided at a predetermined distance from the display element group, and the size of each dot constituting one pixel is enlarged. As a result, light from each dot overlaps, is mixed, and passes through the lens group.

A three-dimensional image display device according to a third aspect of the present invention is the stereoscopic image display device according to the second aspect,
The diffusion plate is provided on the surface of the display element group as a first spatial filter, and another diffusion plate is provided as a second spatial filter at a predetermined distance from the first spatial filter. The spatial filter has a spatial filter function of removing color moire generated when displaying a three-dimensional image by a spatial filter.

According to this configuration, the light of each dot is actively diffused by the first spatial filter provided on the display surface of the display element group, and the diffused light is arranged at a predetermined interval. Diffused by the second spatial filter.

A three-dimensional image display device according to a fourth aspect of the present invention is the stereoscopic image display device according to any one of the first to third aspects, wherein the object is provided by the spatial filter and the spatial filter function. Characterized in that an optical barrier corresponding to each pixel constituting the element image is provided.

According to this configuration, the light constituting one pixel does not affect other light due to the optical barrier corresponding to each pixel constituting the element image of the subject.

According to a fifth aspect of the present invention, there is provided a stereoscopic image display apparatus comprising: a display element group for displaying a captured element image of a subject; and a lens group provided on a display surface side of the display element group. In a three-dimensional image display device that displays a three-dimensional image from the elemental images of the above, the primary colors of one pixel constituting the elementary image of the subject are synchronously switched for each color and time-divisionally displayed on the display element group. I do.

According to this configuration, of the primary colors of one pixel constituting the elementary image of the subject, the same color is simultaneously emitted from each dot which is a minute area constituting one pixel of the display element group.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. (Stereoscopic Image Display Apparatus for Removing Color Moiré by Spatial Filter) FIG. 1 is an explanatory diagram schematically illustrating a stereoscopic image display apparatus for displaying a stereoscopic image based on an element image of a subject. As shown in FIG. 1, the stereoscopic image display device 1 captures an element image 4 of the
A display element group 3 for displaying the element image 4 of the above, a lens group 5 arranged on the surface of the display element group 3 on which the element image 4 is photographed, and including a plurality of lenses; a display element group 3 and a lens group 5 and a spatial filter 7 interposed therebetween.

The display element group 3 is used when shooting a subject.
An element image of a subject obtained through a lens group having a configuration similar to that of the lens group 5 is photographed, and an image signal is displayed. The element images 4 of the subject 6 are photographed in the same number as the number of lenses constituting the lens group 5, and the photographed element images 4 generally have different depth directions depending on the characteristics of the lenses of the lens group 5. The camera was shot in a state where When a stereoscopic image is displayed using such an electronic display element group 3, a moving image can be displayed.

In this embodiment, the lens group 5 includes a plurality of convex lenses arranged on a plane, and one convex lens corresponds to one element image displayed on the display element group 3. It is configured to be. The lens group 5 forms a plurality of element images 4 captured by the display element group 3 so as to appear as a stereoscopic image when viewed by a viewer.

The shape of the lens of the lens group 5 is not limited to a convex lens, but may be a lens such as a graded index optical fiber having a specific length.

The spatial filter 7 is formed, for example, by providing fine irregularities and grooves on the surface of transparent glass or transparent plastic, has a function as a translucent screen, and is a diffusion plate in this embodiment. The diffusing plate is one that becomes incident light (diffused light) diffused when incident light incident from one surface is emitted to the other surface. In other words, the light that has passed through the diffuser is smaller than the light that has entered the diffuser.
The light is spread by a predetermined angle.

The spatial filter 7 is arranged in parallel with the display element group 3 with a gap distance g. The gap distance g is obtained by an equation consisting of g = 2Pd / tan θ. Here, Pd is a pitch between dots forming one pixel. θ is the divergence angle of the light emitted from the display element group 3.

Here, light incident on the spatial filter 7 and
The relationship with the light emitted from the spatial filter 7 will be described with reference to FIGS. The incident light is light emitted (emitted) from each dot of a plurality of pixels constituting the elemental image.

FIG. 2 is an explanatory view showing a case where the spatial filter (diffusion plate) 7 is arranged at a gap distance g from the display element group 3. In FIG. 2, one pixel of one element image of the display element group 3 is illustrated in an enlarged manner. This one pixel is composed of three dots, which are minute regions that emit light of three primary colors, red, green and blue, from the left side in the figure. By mixing these three primary colors, the color of the projected three-dimensional image appears. As shown in FIG. 2, the three primary colors (red, green, and blue) overlap in a portion 7a corresponding to one pixel on the spatial filter 7. That is, when the area width of one dot (inter-dot pitch) Pd is used, the area width of one pixel is 3Pd, and the area width 3Pd substantially matches the width of the portion 7a where the three primary colors overlap.

FIG. 3 is an explanatory view showing a case where the spatial filter (diffusion plate) 7 is arranged at an unspecified distance L from the display element group 3 and the divergence angle of each display element of the display element group 3 is small. It is. As shown in FIG. 3, even if the spatial filters 7 are arranged at an unspecified distance L, the divergence angle is small, so that the three primary colors do not overlap in the area width 3Pd of one pixel. In this case, when the viewer views the stereoscopic image projected by the stereoscopic image display device 1, color moiré is viewed similarly to the conventional stereoscopic image display device. In this case, as shown in FIG. 4, a method using two spatial filters 7 is presented.

FIG. 4 is an explanatory view showing a case where one spatial filter 7 is closely attached to the display element 3 and the other filter 7 is arranged at a specific distance M. As shown in FIG. 4, the region width 3Pd of one pixel substantially matches the width of the portion 7a where the three primary colors overlap.

By the way, when the divergence angle θ of the primary color emitted from each dot of one pixel constituting one element image is enlarged by the above-mentioned spatial filter 7, it is adjacent to the primary color emitted from one pixel. There is a concern that the primary colors emitted from the dots of other pixels may interfere excessively.

Therefore, it is proposed to provide an optical barrier on the side of the spatial filter 7 adjacent to the display element surface.

FIGS. 5 and 6 are explanatory views of the spatial filter 7 provided with an optical barrier. FIG. 5 shows that a spatial filter (diffusion plate) 7 is arranged at a gap distance g from the display element group 3,
FIG. 4 is an explanatory diagram showing a case where an optical barrier 9 is provided. In this embodiment, the optical barrier 9 is formed of black plastic having a surface with irregularities or grooves, and the optical barrier 9 stands upright between the spatial filter 7 and the photographic film 3 as shown in FIG. It is provided as follows. That is,
The height of the optical barrier 9 is formed so as to be substantially equal to the gap distance g, and one end (the upper end in the figure) of the optical barrier 9 is perpendicularly coupled to one surface of the spatial filter 7 facing the display element group 3. The other end (lower end in the figure) of the optical barrier 9 is in contact with the display element group 3.

FIG. 6 is an explanatory view showing a case where two spatial filters 7 are used and an optical barrier 9 is provided when the divergence angle of each display element of the display element group 3 is small. As shown in FIG. 6, one spatial filter 7 is in close contact with the display element group 3, and the other filter 7 is disposed at a gap distance g.
The width of the portion 7a where the primary colors overlap is almost the same.

In the stereoscopic image display device 1, a light source generator for irradiating light from the non-display surface side (back side) of the display element group 3 is omitted, but the light (light source generator) is used for display. This is necessary to obtain a three-dimensional image from the element images of the element group 3. Light emitted from the light source generator may be coherent light or diffused light.

This embodiment has the following effects. The primary colors (red, green, and blue) of one pixel constituting the element image displayed on the display element group 3 are enlarged by the spatial filter 7, and the primary colors of one pixel overlap on the spatial filter 7. Since the mixture is performed, the observer can move the lens group 5
In this case, it is possible to remove or reduce the color moiré of the stereoscopic image observed through the display.

The light emitted from the display element group 3 is expanded by the spatial filter (diffusion plate) 7 provided at a gap distance from the display element group 3, and the size of each dot constituting one pixel is expanded. As a result, the light from each dot overlaps, is mixed and passes through the lens group 5, so that the observer can remove or reduce the color moiré of the stereoscopic image observed through the lens group 5. Can be displayed.

If the divergence angle of the light emitted by the display element group 3 is small and the distance to the diffusion plate 7 is not large, the mixing of the primary colors becomes insufficient in each pixel, and the color moiré cannot be avoided. Since the emitted light is diffused by using the first spatial filter 7 and the second spatial filter 7, the divergence angle of the light increases, and the distance from the display element 3 to the diffusion plate 7 can be shortened. .

The light constituting one pixel is changed by the optical barrier 9 corresponding to each pixel constituting one element image.
Since it does not affect the light that composes other pixels,
The occurrence of color moiré can be prevented.

(Stereoscopic Image Display Apparatus for Eliminating Color Moiré by Time-Division Display) Next, according to the second embodiment, the three primary colors emitted from the dots, which are the minute regions of the pixels constituting the elemental image, will be A three-dimensional image display device that divides time and displays (emits) the same color will be described.

FIG. 7 is an explanatory diagram of a three-dimensional image display device for displaying each color displayed from a dot in a time-division manner. As shown in FIG. 7, the three-dimensional image display device 51 includes an element image photographing / reproducing section 53 for photographing and reproducing an element image, and a display section 55 displaying a video signal transmitted from the element image photographing / reproducing section 53. And a lens group 57 disposed on the display surface side of the display unit 55, a backlight irradiation unit 59 provided on the back side of the display unit 55, and control of the element image photographing and reproducing unit 53 and the backlight irradiation unit 59. And a control unit 61 for controlling it.

The element image photographing / reproducing section 53 includes a lens group having the same configuration as the lens group 57 (not shown), a television camera, and a storage device. In the element image photographing / reproducing unit 53, a stationary or moving subject is photographed by a television camera or the like as a subject image obtained through a lens group having the same configuration as the lens group 57. The stored element image of the subject is stored in the storage device as a video signal. The storage device is composed of a large-capacity memory, hard disk, etc.
In the stored video signal, the same color constituting each pixel is simultaneously reproduced based on a control signal (video time division signal) from the control unit 61.

The display unit 55 includes a general liquid crystal, LCD, and E.
L or a combination thereof.

In this embodiment, the lens group 57 has a plurality of convex lenses arranged on a plane.

As shown in FIG. 8, the backlight irradiating section 59 includes two half mirrors 63, three backlights 65, and ON / OFF of the backlight 65.
The switch 67 is provided. In the backlight irradiating section 59, the switch 67 is turned on based on a control signal (backlight time division signal) from the control section 61.
/ OFF is switched at high speed (for example, every 1/180 second) and any backlight (blue, red, or green)
Lights up. For example, when the backlight 65a is turned on, the blue light emitted from the backlight (blue backlight) 65a is reflected by the half mirror 63a and emitted from the back of the display unit 55.

The control unit 61 corresponds to the main control unit of the computer, and converts the video signals of each element image stored in the storage device of the element image photographing and reproducing unit 53 into three primary colors (blue, red, (Green) and synchronizes the reproduction of the video signal for each primary color with the ON / OFF of the switch 67 of the backlight 65 (blue, red, green) of the backlight irradiator 59. .

In this embodiment, in the element image photographing / reproducing section 53, of the primary colors of one pixel constituting the element image of the subject, the same color is reproduced simultaneously based on the video time division signal from the control section 61. In addition, since the backlight corresponding to each color emitted from the dot is irradiated based on the backlight control signal, the display unit (display element group)
Only the same color is emitted simultaneously from each dot, which is a minute area constituting 55 pixels. For this reason, interference of different colors between dots which causes color moiré does not occur, and color moiré can be removed or reduced.

Although the present invention has been described based on one embodiment, the present invention is not limited to this.

[0051]

According to the first aspect of the present invention, the primary colors (red, green, and blue) of one pixel constituting the element image displayed on the display element group are enlarged by the spatial filter, and the spatial filter is used. Since the primary colors in one pixel are overlapped and mixed on the filter, it is possible to remove or reduce the color moire of the stereoscopic image observed by the observer through the lens group, and display the stereoscopic image.

According to the second aspect of the present invention, the light emitted from the display element group is enlarged by the diffusion plate provided at a predetermined distance from the display element group, and the size of each dot constituting one pixel is enlarged. Is in an expanded state,
Since the light from each dot overlaps, is mixed and passes through the lens group, it is possible to display the stereoscopic image that the observer observes through the lens group with the color moire removed or reduced.

According to the third aspect of the present invention, the light of each dot is positively diffused by the first spatial filter provided on the display surface of the display element group, and the diffused light is separated by a predetermined interval. Is diffused by a second spatial filter arranged in a vertical direction. For this reason, if the divergence angle of the light emitted by the display element group is narrow, unless the distance to the diffuser is increased, the mixing of the primary colors in each pixel becomes insufficient and color moiré cannot be avoided. Since the emitted light is diffused by using the spatial filter and the second spatial filter, the divergence angle of the light increases, and the distance from the display element to the diffusion plate can be shortened.

According to the fourth aspect of the present invention, the light constituting one pixel does not affect the other light due to the optical barrier corresponding to each pixel constituting the elementary image of the subject. Can be prevented from interfering with each other, and the occurrence of color moiré can be prevented.

According to the fifth aspect of the present invention, of the primary colors of one pixel constituting the elementary image of the subject, the same color is simultaneously emitted from each dot which is a minute area constituting one pixel of the display element group. Therefore, interference of different colors between dots, which causes color moiré, does not occur, and color moiré can be eliminated or reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram schematically illustrating an embodiment of a three-dimensional image display device for displaying a three-dimensional image according to the present invention.

FIG. 2 is an explanatory diagram showing a case where a spatial filter (diffusion plate) is arranged at a gap distance g from a photographic film.

FIG. 3 is an explanatory diagram showing a case where a spatial filter (diffusion plate) is arranged at an unspecified distance L from a photographic film, and each display element of the photographic film (display element group) has a small divergence angle.

FIG. 4 is an explanatory view showing a case where one spatial filter is brought into close contact with a photographic film, and the other filter is arranged at a specific distance M.

FIG. 5 is an explanatory diagram showing a case where a spatial filter (diffusion plate) is arranged at a gap distance g from a photographic film and an optical barrier is provided.

FIG. 6 is an explanatory diagram illustrating a case where two spatial filters are used and an optical barrier is provided when the divergence angle of each display element of a photographic film (display element group) is small.

FIG. 7 is an explanatory diagram of a stereoscopic image display device according to another embodiment, which displays each color displayed from a dot in a time-division manner.

FIG. 8 is an explanatory diagram of a backlight irradiation unit.

FIG. 9 is an explanatory diagram schematically illustrating shooting of an element image of a subject in a conventional IP.

FIG. 10 is an explanatory diagram schematically illustrating reproduction of a three-dimensional image based on an element image of a subject in a conventional IP.

FIG. 11 is an explanatory view of a conventional display device as viewed from the side.

FIG. 12 is an explanatory diagram for explaining a conventional arrangement of element lenses of a lens group.

FIG. 13 is an explanatory view for explaining a conventional arrangement of element lenses of a lens group.

FIG. 14 is an explanatory diagram schematically showing one pixel obtained by enlarging an element image displayed on a conventional display device.

FIG. 15 is an explanatory diagram illustrating a cause of occurrence of color moiré for an observer observing a conventional display device.

FIG. 16 is an explanatory diagram illustrating a state of color moiré in a conventional display device.

[Explanation of symbols]

 Reference Signs List 1,51 stereoscopic image display device 3 display element group 5,57 lens group 7 spatial filter (diffusion plate) 9 optical barrier 53 elemental image photographing and reproducing unit 55 display unit 59 backlight irradiation unit 61 control unit

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Jun Atsushi 1-10-11 Kinuta, Setagaya-ku, Tokyo Inside Japan Broadcasting Corporation Broadcasting Research Institute (72) Maki Kobayashi 1-10-kinuta, Setagaya-ku, Tokyo 11 Japan Broadcasting Corporation Research Institute of Broadcasting Technology (72) Inventor Tomoyuki Mishina 1-10-11 Kinuta, Setagaya-ku, Tokyo Tokyo Broadcasting Research Institute of Japan (72) Koji Mitani Inventor Kinuta Setagaya-ku, Tokyo F-term (reference) 1-10-10-11 Japan Broadcasting Corporation Broadcasting Research Institute 2H059 AB13 5C061 AA21 AB04 AB16

Claims (5)

[Claims] 1. A stereoscopic image display comprising a display element group for displaying a captured element image of a subject and a lens group provided on a display surface side of the display element group, and displaying a stereoscopic image from the element image of the subject. The apparatus according to claim 1, further comprising a spatial filter between the display element group and the lens group, for expanding and mixing each primary color of one pixel constituting the element image of the subject. 2. The three-dimensional image display device according to claim 1, wherein a diffusion plate is provided as the spatial filter, and the diffusion plate is provided at a predetermined distance from the display element group. 3. The display device according to claim 1, wherein the diffuser is provided on the surface of the display element group as a first spatial filter, and another diffuser is provided as a second spatial filter at a predetermined distance from the first spatial filter. The three-dimensional image display device according to claim 2, further comprising a spatial filter function of removing a color moire generated when displaying the three-dimensional image by the spatial filter and the second spatial filter. 4. The spatial filter and the spatial filter function according to claim 1, further comprising an optical barrier corresponding to each pixel forming an element image of the subject. Item 3. The stereoscopic image display device according to item 1. 5. A stereoscopic image display comprising a display element group for displaying a captured element image of a subject and a lens group provided on a display surface side of the display element group, and displaying a stereoscopic image from the element image of the subject. In the device, a three-dimensional image display device is characterized in that the primary colors of one pixel constituting the elementary image of the subject are synchronously switched for each color and displayed on the display element group in a time division manner.