JP6730817B2 - 3D image display device - Google Patents

Description

The present invention relates to a stereoscopic image display device, and more particularly to an integral type stereoscopic image display device.

The integral 3D image display device is a 3D image display device that does not require special glasses and allows stereoscopic viewing with the naked eye. As shown in FIG. 6A, the conventional integral stereoscopic image display device 9 includes a direct-view type display P such as a liquid crystal panel and a lens array L _A arranged in front of the direct-view type display P. .. In this lens array L _A , as shown in FIG. 6B, element lenses L _P are arranged two-dimensionally. Further, as shown in FIG. 6A, the element lens L _P and the element image G correspond to each other, and the element image L is projected into the space by the element lens L _P to form a stereoscopic image Z. It

In the integral stereoscopic video, in order to improve the number of pixels, the viewing area, and the depth reproduction range of the stereoscopic video, it is necessary to display a video (elemental image) having a very large number of pixels on the direct-view display P. However, at present, there is no direct-view display P having a pixel number exceeding that of Super Hi-Vision. Therefore, it is difficult to improve the quality of the integral stereoscopic image with the single direct-view display P. Therefore, a technique for increasing the number of pixels using a plurality of direct-view displays P is required. In addition, increasing the number of pixels means increasing the number of pixels (element pixels) forming an element image, and as a result, comparing with the number of pixels of a stereoscopic image reproduced by a single display and lens array. To increase the number of pixels in stereoscopic video.

N. Okaichi, M. Miura, J. Arai and T. Mishina, “Integral 3D display using multiple LCDs”, Proc. SPIE, vol. 9391, 939134 (2015) Naoto Okaichi, Masato Miura, Atsushi Senrai, Masahiro Kawakita, Tomoyuki Mishina, "Integral 3D Image Display Using Multiple 8K LCD Panels", Technical Report of the Institute of Image Information and Television Engineers, October 2015, vol. 39, no.36, pp.1-4

There are the following problems when combining images displayed on a plurality of displays to increase the number of pixels. In other words, when multiple displays are arranged in parallel as they are, each display has a bezel portion (frame), so a break in the image (two-dimensional image) occurs at the bezel portion, and the same is true for the stereoscopic image reproduced. Breaks will occur. In response to this problem, it is not easy at present to manufacture a display without a bezel portion. Therefore, it is necessary to develop a method for seamlessly combining images displayed on a plurality of displays, in consideration of using a normal display having a bezel portion.

Under such circumstances, the inventors of the present application have so far proposed a method using an optical system that magnifies and forms an image displayed on each display and combines the images (see Non-Patent Document 1 and Non-Patent Document 2). The configuration of this conventional stereoscopic image display device is shown in FIG. The stereoscopic image display device 100 includes a plurality of displays 120, a plurality of magnifying optical systems 130, a diffusion plate 140, and a lens array 150.

Each display 120 arranged on the same plane has a display portion 122 and a bezel portion (frame) 124. Each display 120 is a direct-view display, and displays an image (element image) according to the arrangement of the display by parallel light projected from the parallel light projection device 110 that functions as a backlight.

The plurality of magnifying optical systems 130 are arranged on the same plane at predetermined intervals so as to correspond to the display 120. The magnifying optical system 130 is disposed in front of the display 120, and is formed to be the same size as or slightly larger than the size of the display unit 122 so that light of an image displayed on the display unit 122 of the display 120 can enter. Each magnifying optical system 130 magnifies the image (elemental image) displayed on the display 120.

The diffusion plate 140 is formed larger than the entire size of the plurality of magnifying optical systems 130. The diffusion plate 140 is placed at a position where an image is formed by the magnifying optical system 130. As a result, a plurality of magnified images (two-dimensional images) are combined on the diffuser plate 140, and the combined image becomes a multi-pixel element image.

The lens array 150 is composed of two-dimensionally arrayed element lenses 152, and is formed to be the same size as or slightly larger than the size of the diffuser plate 140 so that the image light diffused from the diffuser plate 140 can enter. The lens array 150 is arranged in front of the diffusion plate 140, and reproduces an integral stereoscopic image from the element image having a large number of pixels by the diffusion plate 140.

As an example of the magnifying optical system 130 described above, as shown in FIG. 5, an optical system in which two sets of lens arrays 132A and 132B composed of biconvex lenses and a concave Fresnel lens 136 are combined is used. Here, the lens array 132A is arranged on the display 120 side, the concave Fresnel lens 136 is arranged on the diffusion plate 140 side, and the lens array 132B is arranged between the lens array 132A and the concave Fresnel lens 136. Has been done. The lens arrays 132A and 132B are composed of element lenses 134 arranged two-dimensionally. With such a configuration, the magnifying optical system 130 functions as an erecting magnifying optical system that magnifies an erecting equal-magnification image of the subject.

At this time, the display 120 is arranged apart from the lens array 132A so that the light of the image displayed on the display 120 can be condensed at an intermediate position between the lens array 132A and the lens array 132B. Further, the diffusion plate 140 is arranged at the image forming position of the concave Fresnel lens 136.

However, when the magnifying optical system 130 has a complicated structure using two lens arrays 132A and 132B as shown in FIG. 5, high processing accuracy and precise axis alignment are required. Therefore, if the magnifying optical system 130 has a complicated configuration, a large cost is required to bring out sufficient resolution characteristics in the stereoscopic image display device 100. Further, in the stereoscopic image display device 100, it is necessary to dispose the diffusion plate 140 in order to combine the magnified images at the image forming positions. It is not easy to accurately combine two-dimensional magnified images at the position of the diffuser plate 140, which also causes deterioration of the quality (image quality) of stereoscopic images. Therefore, the conventional stereoscopic image display device 100 has room for improvement.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a stereoscopic video display device that suppresses deterioration of image quality at low cost and improves the quality of integral stereoscopic video.

In order to solve the above problems, a stereoscopic image display device according to the present invention is a stereoscopic image display device that displays an integral type stereoscopic image, and is an element of a partial stereoscopic image that reproduces a part of the stereoscopic image. A plurality of displays arranged on the same plane, each displaying an image, and the partial stereoscopic image which is arranged in front of the display units of the plurality of displays and in which light from the element images displayed on the display unit is incident. A plurality of lens arrays for reproducing a plurality of lens arrays, and a plurality of magnifying optical systems that are respectively arranged on the light emission sides of the plurality of lens arrays and that magnify incident light that is incident as a reproduced partial stereoscopic image . The magnifying optical systems are arranged so as to be adjacent to each other, and the three-dimensional images are displayed by combining the partial three-dimensional images magnified by the adjacent magnifying optical systems with each other .

With this configuration, in the stereoscopic image display device, the display displays the elemental image of the partial stereoscopic image. Since a lens array is provided in front of the display unit of each display, a partial stereoscopic image corresponding to the arrangement of each display is reproduced by each lens array. Then, in the stereoscopic image display device, the partial stereoscopic image is magnified by the magnifying optical system provided on the light emitting side of each lens array. At that time, since the magnifying optical systems are arranged so as to be adjacent to each other, it is possible to combine images which are incident light at the positions of the magnifying optical systems, and the magnifying optical systems respectively magnify the partial stereoscopic images. Since the images are combined and emitted, a high-resolution enlarged stereoscopic image can be displayed.

According to the stereoscopic image display device of the present invention, it is possible to suppress deterioration of image quality at low cost and improve the quality of integral stereoscopic images without providing a diffusion plate.

It is a schematic diagram showing the composition of the three-dimensional image display device concerning the embodiment of the present invention. It is a schematic diagram showing the composition of the expansion optical system of Drawing 1 from the side. It is explanatory drawing explaining expansion of a stereo image. It is a schematic diagram showing an example of composition of a stereoscopic image display concerning conventional technology. FIG. 5 is a schematic diagram illustrating a configuration example of the magnifying optical system in FIG. 4. It is explanatory drawing explaining the conventional integral stereoscopic image display apparatus.

[Configuration of stereoscopic image display device]
The configuration of the stereoscopic video display device 1 according to the embodiment of the present invention will be described with reference to FIG. 1. The sizes and positional relationships of members shown in the drawings may be exaggerated for clarity of explanation. As shown in FIG. 1, the stereoscopic image display apparatus 1 displays an integral type stereoscopic image, and includes a plurality of sets each including a display 20, a lens array 50, and a magnifying optical system 30.

In the following description, as an example, it is assumed that four displays 20 are arranged side by side vertically and horizontally on the same plane. These four displays 20 are arranged in parallel so as to be in close contact with each other. Each display 20 has a display portion 22 and a bezel portion (frame) 24. The display unit 22 is a portion that displays a video (elemental image). The bezel portion 24 is formed around the display unit 22 and no image is displayed.

Each display 20 is a direct-viewing type display such as a liquid crystal panel, and displays an image (element image) by the diffused light projected from the diffused light projector 10 that functions as a backlight. As the display 20, a transmissive liquid crystal display of Super Hi-Vision (7680×4320 pixels) is preferably used.

The display 20 displays an image (elemental image) according to the arrangement of the display. Here, the elemental image displayed according to the arrangement of the displays means one integral stereoscopic image formed when the four integral stereoscopic images reproduced by the respective displays 20 and the lens array 50 are combined with each other. Is an element image of a scene divided into four. That is, it is an element image for reproducing and displaying a partial stereoscopic image that reproduces a part of the stereoscopic image to be displayed finally.

Specifically, when the stereoscopic image to be finally displayed is a person as shown in FIG. 1, the elemental image displayed on the upper left display 20 when viewed from the viewing direction is a partial image mainly of the upper right half of the person. It is an element image for reproducing a different stereoscopic image.
Similarly, a partial stereoscopic image mainly consisting of the upper left body of the person is displayed on the upper right display 20, the lower right body of the person is displayed on the lower left display 20, and the lower left body of the person is displayed on the lower right display 20. Element images for reproduction are displayed respectively.

Here, the element images displayed on the display 20 will be briefly described.
For example, an object is photographed by a general IP stereoscopic camera, and the acquired element image group is divided into the same number as the display 20 (four pieces). By enlarging the divided element image group according to the size of the display unit 22, it is possible to generate an element image corresponding to the partial stereoscopic image. Then, each display 20 displays the element image corresponding to each arrangement.

A lens array 50 is arranged on the front surface of each display 20.
The lens array 50 is composed of element lenses 52 arranged two-dimensionally. Element lenses 52 are arranged in the lens array 50 in a state of being aligned in the plane direction. The size of the lens array 50 is about the same as the size of the display unit 22 of the display 20. Although FIG. 2 and FIG. 3 illustrate the eight element lenses 52 in one dimension, the number of the element lenses is arbitrary, and is typically tens of thousands or more.

The lens array 50 is arranged near the display unit 22 of the display 20, and light from the elemental image displayed on the display unit 22 is incident on the lens array 50. As a result, it is possible to reproduce the integral stereoscopic video. Note that the integral stereoscopic image reproduced by the set of the display 20 and the lens array 50 at this time is the final stereoscopic image because the acquired elemental image group is divided into four by the four displays 20 here. It is a partial stereoscopic image that is divided into four.

The lens array 50 is preferably arranged so as to contact the display unit 22 of the display 20. With such a configuration, the lens array 50 is fixed to the display unit 22 of the display 20 and the positional displacement can be prevented.

In the present embodiment, as an example, the element lens 52 is a plano-convex lens, and the flat surface side is adhered to the display unit 22 of the display 20 by being bonded. The shape of the element lens 52 is not limited to a circle, and may be a square. Further, although the element lenses 52 are arranged in a square lattice shape (grid structure), they may be arranged in a bag shape or a so-called line offset shape.

A magnifying optical system 30 is arranged on the front surface of each lens array 50.
The four magnifying optical systems 30 are arranged on the same plane so as to correspond to the display 20 and the lens array 50, respectively. Further, the plurality of magnifying optical systems 30 are arranged adjacent to each other on the same plane as shown in FIG. The magnifying optical system 30 is arranged on the light emitting side of the lens array 50 and magnifies the incident light. The light of the integral stereoscopic image (partial stereoscopic image divided into four parts) reproduced by the lens array 50 is incident on the magnifying optical system 30. Each of the magnifying optical systems 30 magnifies an integral stereoscopic image (partial stereoscopic image divided into four parts).

As an example of the magnifying optical system 30, an optical system in which a concave lens and a convex lens are combined can be used. As the lens type, a Fresnel lens, a spherical lens, an aspherical lens, or the like can be used. In the example shown in FIG. 2, the magnifying optical system 30 includes one concave lens 32 and one convex lens 34 in this order from the side of the lens array 50, and the optical axes of the concave lenses 32 are aligned with each other.

The concave lens 32 is located on the front surface of the lens array 50, and is arranged at a position in close contact with the lens array 50. The concave lens 32 spreads the incident light which is the light of the integral stereoscopic image (partial stereoscopic image divided into four). The light emitted from the concave lens 32 enters the convex lens 34.
The convex lens 34 is formed to have a size larger than that of the concave lens 32 so that most of the light emitted from the concave lens 32 enters. The convex lens 34 is arranged so as to face the concave lens 32, and plays a role of refracting light that has been diverged by the concave lens 32 and has directionality so as to be nearly parallel to the axial direction.

Further, in FIG. 2, the concave lens 32 is shown in a state of being separated from the lens array 50, but it is preferable that the concave lens 32 is arranged so as to be in contact with the lens array 50. With this structure, the concave lens 32 is fixed to the lens array 50, and the positional deviation can be prevented.

The diffused light projection device 10 is arranged on the back surface of each display 20.
The four diffused light projection devices 10 are arranged on the same plane so as to correspond to the display 20, and project the diffused light onto the display 20. Further, the diffused light projection device 10 can be arranged at an arbitrary distance from the display 20.

As the diffused light projection device 10, for example, a general backlight for a liquid crystal panel can be used. Such a backlight includes, for example, a backlight light source, a light guide plate, a diffusion plate, a light diffusing film, and the like. For the backlight light source, for example, an LED, a CCFL (cold cathode tube), or the like is used.

<Enlargement of 3D image>
Enlargement of a stereoscopic image in the stereoscopic image display device 1 will be described with reference to FIG.
In the stereoscopic image display device 1, the element images are displayed on the respective displays 20, and an integral stereoscopic image (partial stereoscopic image divided into four) is reproduced by the lens array 50 arranged in front of them. Then, the integral stereoscopic image (four-divided partial stereoscopic image) reproduced by each display 20 is enlarged by the magnifying optical system 30 arranged in front of each display 20 and the lens array 50.

Further, in the stereoscopic image display device 1, the light of the partial stereoscopic image reproduced by each lens array 50 passes through the magnifying optical system 30. At that time, even if a gap between the partial stereoscopic images is generated as a break of the stereoscopic images before the light enters the magnifying optical system 30, the light of each partial stereoscopic image is emitted. By passing through, the breaks in the stereoscopic image become smaller and disappear as the partial stereoscopic image becomes larger. Therefore, the enlarged partial stereoscopic images are seamlessly combined. As described above, in the stereoscopic image display device 1, seamlessly combining the enlarged partial stereoscopic images with each other can reproduce a seamless multi-pixel integral stereoscopic image.

According to the three-dimensional image display device 1 of the present embodiment, it is possible to increase the number of pixels of the element image, and thus the quality of the integral three-dimensional image can be improved.
Further, the magnifying optical system 30 can be configured by a simple optical system as compared with the structure of the conventional magnifying optical system 130 shown in FIG. 5, and it is necessary to use a diffusion plate as in the conventional stereoscopic image display device 100 shown in FIG. Therefore, it is possible to suppress a decrease in resolution.
Further, according to the stereoscopic image display device 1, it is possible to increase the number of pixels without an upper limit by increasing the number of sets of the display 20, the lens array 50 and the magnifying optical system 30.

Further, the stereoscopic image display device 1 has an effect of making the entire device thinner than the conventional stereoscopic image display device 100 shown in FIG. Specifically, in the configuration of the conventional stereoscopic image display device 100, when using a magnifying optical system 130 as shown in FIG. 5, if a normal backlight for a liquid crystal panel is used for the display 120, Stray light is generated under the influence of the lens arrays 132A and 132B of the magnifying optical system 130, and the image of the direct-view display 120 is formed as a multiple image on the diffusion plate 140, which leads to deterioration of the resolution of the stereoscopic image. Therefore, in order to prevent the generation of stray light, it is necessary to use the parallel light projection device 110 capable of projecting parallel light instead of diffused light on the display 120.
However, in order to generate parallel light, for example, an optical system for converting diffused light into parallel light is required. Therefore, the device depth of the parallel light projection device 110 becomes large. Therefore, the depth of the entire stereoscopic image display device including the parallel light projection device 110 becomes large.

On the other hand, the stereoscopic image display device 1 uses the diffused light projection device 10 as a backlight of the display 20, and the diffused light projection device 10 does not need to generate parallel light, so that the depth of the device is reduced. can do. Therefore, it is possible to reduce the thickness of the entire stereoscopic image display device including the diffused light projection device 10.
Table 1 shows the results of comparing the prototype stereoscopic image display device 1 (Example 1) and the prototype stereoscopic image display device 100 (Comparative Example 1) by measuring the depth width of the entire device including the backlight. .. The structure shown in Table 2 below was used in Example 1.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and the present invention can be carried out within the scope of the invention. For example, with respect to the element images displayed by the display 20, the element image group obtained by photographing is divided into the same number as the display 20 and enlarged, but the overlapping element images are displayed as the margin of the connecting line. Good. In this case, after dividing the element image group, in two element image groups adjacent to each other after the division, the same element image having a predetermined width inside from the dividing line of one element image group is divided into the other element image group. Add from the line to the outside. Note that the other size after adding the elemental images is divided in advance so that it becomes the same as the one size.

DESCRIPTION OF SYMBOLS 1 Stereoscopic image display device 10 Diffuse light projection device 20 Display 22 Display part 24 Bezel part 30 Enlarging optical system 32 Concave lens 34 Convex lens 50 Lens array 52 Element lens

Claims (5)

A stereoscopic image display device for displaying an integral type stereoscopic image,
A plurality of displays arranged on the same plane, each of which displays an elemental image of a partial stereoscopic image that reproduces a part of the stereoscopic image,
A plurality of lens arrays that are respectively arranged in front of the display units of the plurality of displays, and that receive light from the elemental images displayed on the display units to reproduce the partial stereoscopic image ,
A plurality of magnifying optical systems that are respectively arranged on the light exit sides of the plurality of lens arrays and that magnify incident light that is incident as a reproduced partial stereoscopic image ;
Equipped with
The three-dimensional image display device is characterized in that the plurality of magnifying optical systems are arranged adjacent to each other, and the three- dimensional images are displayed by combining partial three-dimensional images magnified by the adjacent magnifying optical systems with each other. .. The stereoscopic image display device according to claim 1, wherein the lens array is arranged so as to come into contact with a display portion of the display. The display is a direct-view display with a backlight,
The stereoscopic image display device according to claim 1 or 2, wherein the backlight emits diffused light. The three-dimensional image display device according to claim 1, wherein the magnifying optical system includes a concave lens and a convex lens in order from the lens array side. The stereoscopic image display device according to claim 4, wherein the concave lens of the magnifying optical system is arranged so as to contact the lens array.

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