JP2544516B2 - 3D image display device - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a display device which obtains a stereoscopic effect through a lenticular plate, and more particularly to a three-dimensional image display device used for observing a three-dimensional image having horizontal parallax from an image display device such as a television.

[Prior art]

The lenticular plate used for stereoscopic viewing is a lens plate 30 having a periodic curvature in the horizontal direction, as shown in FIG. 3 (a), and has a configuration in which a large number of cylindrical lenses are arranged. As shown in the cross-sectional explanatory view of one cylindrical lens shown in FIG. 3 (b), it is designed to focus on the smooth surface 35 on the back surface. In the case of observing a three-dimensional printed matter, a plurality of (two or more) images having parallax are linearly divided, compressed, and reconstructed on the back surface of the lenticular plate according to the characteristics of the lens. A single image 38 is formed. When observing, the left and right eyes of the human see images at different positions (that is, images with parallax) on the back surface of the lenticular plate, and a stereoscopic effect can be obtained.

[Problems to be Solved by the Invention]

However, in the above-mentioned conventional lenticular plate, since the required optical characteristics require focusing on the smooth surface of the back surface, the thickness of the lenticular plate depends on the pitch and the radius of curvature of the cylindrical lens. It has been done. In order to reduce the thickness of the lenticular plate, it is possible to reduce the pitch and radius of curvature of the cylindrical lens. However, because of the size and composition of the displayed 3D image,
It may not be possible to make a lenticular plate with a small pitch or radius of curvature. Acrylic resin is mainly used as the material of the lenticular plate, but even if the resin is colorless and transparent, the rays of light passing through it are unclear due to scattering or the like. INDUSTRIAL APPLICABILITY The present invention is intended to improve the lenticular plate, which is required to have a large screen, from the viewpoint of reducing the weight and improving the sharpness of light rays.

[Means for Solving the Problems]

That is, according to the present invention of claim 1, a cylindrical lens is horizontally arranged in parallel on one surface,
In a three-dimensional image display device using a lenticular plate whose other surface is flat, a lenticular plate having a thickness less than the focal length of a cylindrical lens and an imaging screen plate are provided on the flat surface side of the lenticular plate in the peripheral portion. The focal planes of the cylindrical lens groups other than the peripheral portion, which are laminated and integrated via a spacer, are set so as to be substantially on the imaging screen plate by the thickness of the spacer. A three-dimensional image display device is characterized in that an image in which a plurality of images having parallax are combined according to the characteristics of the lenticular plate is projected on the imaging screen plate. According to the invention of claim 2, a cylindrical lens is horizontally arranged in parallel on one surface,
In a three-dimensional image display device using a lenticular plate whose other surface is flat, an image in which a lenticular plate having a thickness less than the focal length of a cylindrical lens and a plurality of images having parallax are combined according to the characteristics of the lenticular plate. And a panel for displaying, on the flat surface side of the lenticular plate, are laminated and integrated in the peripheral portion via a spacer, and the focal plane of the cylindrical lens group other than the peripheral portion via the air layer is the spacer. The three-dimensional image display device is characterized in that the thickness is determined to be substantially on the display surface of the panel. According to the invention of claim 3, in a three-dimensional image display device using a lenticular plate in which cylindrical lenses are arranged in parallel on both sides in the horizontal direction at the same pitch, the cylindrical lenses are arranged in parallel on one side,
It has a flat lenticular plate on the observer side and a similar lenticular plate on the projection side, which has a flat surface on the other side and is less than the focal length of the cylindrical lens, and both lenticular plates sandwich the imaging screen plate. The focal planes of the cylindrical lens groups other than the peripheral portion, which are laminated and integrated on the peripheral portions on both sides of the flat surface, through the air layer, are different from each other depending on the thickness of the spacer. It is set so that it is almost on the image forming screen plate, and a plurality of projectors project a plurality of images with parallax on the lenticular plate on the projection side. It is an image display device. A three-dimensional image display device using a lenticular plate can be classified into (a) two-image system and (b) multi-image system according to the number of images having parallax. In the two-image type and multi-image type lenticular plates, the shape of the cylindrical lens must be changed. An example of the case of the four-image type is shown below. If the product size is large (2m x 3m), assuming that the above lenticular plate is made of acrylic resin, the weight is 360kg in (a) and 104kg in (b), which is very heavy and costly. Is also expensive. As an image forming screen plate on which light rays are focused and an image should be displayed, for example, a diffusion sheet (plate) having the following configuration can be considered. A sheet that diffuses light by mixing an opacifying agent. A mixture of a transparent resin with a diffusing agent such as silica. One side of the transparent resin plate that has been matt-processed (the surface should be molded into an uneven shape). A transparent resin plate with one surface coated with or coated with a transparent paint containing a diffusing agent such as silica as a solid content.

[Action]

In the three-dimensional image display device (lenticular screen) having the configuration of the present invention, the lens-shaped portion having the light-condensing property is a thin plate shape, and the straight light advancing portion (optical path) thereafter is an air layer, so the display device The overall weight is very light, and the image collected on the imaging screen, which is the focal plane, is clear without being affected by scattering or the like.

【Example】

Hereinafter, a more detailed description will be given with reference to examples. Example 1 FIG. 1 is an explanatory view showing an example (two-image type) of a three-dimensional image display device (lenticular screen) 10 according to the present invention, and FIG. 1 (a) is an overall perspective view. Figure 1 (b) shows A
FIG. 1 (c) is a cross-sectional explanatory view showing a partial cross section of the cross section A-A, and FIG. The lenticular plate 12 and the imaging screen plate 14 are
It is configured to face the peripheral portion via a spacer 16 having a predetermined width and thickness, and the focal plane of the lenticular plate 12 is almost present on the diffusion-treated 15 surface of the screen plate 14. Has become. The respective dimensions of the three-dimensional image display device (lenticular screen) of this embodiment are shown in Table 1 below. Here, each symbol means the radius of curvature R of the lenticular plate, the pitch p, the thickness t, the total thickness D of the display device, the thickness s of the image forming screen plate, and the thickness d of the spacer. As a comparative example, Table 1 shows the dimensions of a conventional three-dimensional image display device (lenticular screen) having the configuration shown in FIG. 3 (a). In addition, the weight W of the display device and the light transmittance T
(When the light source emitted from the projector is 100,
A comparison of the percentage of light reaching the observer) is also shown in the table. The display device has an area of 700 mm × 900 mm in both Example-1 and Comparative Example. In the present embodiment, the thickness D of the entire display device is reduced because the focal length of the light ray entering the lens is shortened due to the difference in the refractive index between the lens-shaped portion and the air layer inside. . (See FIG. 1 (c). In FIG. 1, dotted lines indicate the optical paths of light rays in the comparative example.) Also, FIG. 1 shows a method of applying the display device (lenticular screen) according to the present embodiment to a liquid crystal video projector. d). An image having a parallax so that two images can be stereoscopically viewed is projected on the screen surface 17 for displaying an image by the projector so that two images are displayed at one pitch corresponding to the pitch of the cylindrical lens. ing. The observer sees the parallax image on the screen surface 17 with the left and right eyes through the display device from a predetermined distance, and can obtain a stereoscopic image. In the present embodiment, the display device in the case of the two-image type has been described, but the same applies to the case of the multi-image type in which the shape of the cylindrical lens is different, not limited to the two-image type. Even in the case of the multi-image system, the observer can obtain a stereoscopic image, but the multi-image system has an advantage that a region in which stereoscopic vision is possible is widened. <Embodiment-2> FIG. 2 is an explanatory view showing another embodiment of the present invention. FIG. 2 (a) is an overall perspective view, and FIG. 2 (b) is a partial cross-sectional view taken along the line AA. FIG. 2 (c) is a sectional explanatory view showing a pair of cylindrical lenses. Projection side lenticular plate 22 and imaging screen plate 24
Is a structure facing the peripheral part via a spacer 26 having a predetermined width and thickness, and a similar observation side lenticular plate 23 to the viewing side is also a structure facing via a spacer 27, The focal planes of both lenticular plates are located substantially on the diffused surface 25 of the screen plate 24. A method of using the display device according to the present embodiment applied to a liquid crystal video projector is shown in FIG. 2 (d). A plurality of projectors are arranged at a predetermined position on the projection side, and a parallax image is projected toward the observation side. The projected image is condensed by the projection side lenticular plate 22 and is formed on the image forming screen plate 24 so that a plurality of images are displayed at one pitch corresponding to the pitch of the cylindrical lenses. . The observer can view the lenticular plate 23 on the observation side from a predetermined distance.
Through, the parallax images on the screen plate 24 are viewed with the left and right eyes, respectively, and a stereoscopic image can be obtained. <Embodiment-3> FIG. 4 is an explanatory view showing another embodiment of the present invention. For example, there is a configuration in which an image is displayed by light that has passed through a liquid crystal display device from a light source. On the display surface of the liquid crystal display device 40, a plurality of image portions 44 (transparent electrodes face each other,
(Transparent / non-transparent portions) are arranged at a predetermined pitch, and an image pattern is formed by the operation (transparent / non-transparent) of each of the image portions 44. (FIG. 4 (a)) In such a display format, an image forming screen surface (for example, which has been subjected to a diffusion process) is not necessary for forming an image of a display image. On the display surface of the liquid crystal display device 40, a lenticular screen having no image forming screen plate 14 in FIG. 1 is mounted as shown in FIG. 4 (b). The focal plane of the lenticular plate should be substantially on the display surface of the liquid crystal display device 40. The observer can see the parallax image on the display surface with the left and right eyes through the display device from a predetermined distance, and can obtain a stereoscopic image. In addition, in the present embodiment, the case of the liquid crystal display device has been described, but the present invention is not limited to this, and as another display device of such a display type that does not require an image forming screen surface, EL ( Electroluminescence displays, plasma displays, etc. are also applicable to these.

【The invention's effect】

The effects of the present invention can be listed as follows. The hollow structure can reduce the weight of the entire display device. The thickness of the entire display device can be reduced. The transmittance of light rays can be increased and a clear image can be obtained. The amount of transparent resin used for the lenticular plate can be reduced, and the cost of the display device can be reduced.

[Brief description of drawings]

1, 2, and 4 are explanatory views showing a three-dimensional image display device of the present invention and a stereoscopic display method using the device, and FIG. 3 is a conventional three-dimensional image display device. FIG.

[Explanation of symbols]

 10,20,30… 3D image display device 12,22,23… Lenticular plate 14,24… Image screen screen 16,26,27… Spacer 15,25,35… Diffusion surface 17,28… Air layer 18 … Screen surface 38… Parallax image 40… Liquid crystal display device 44… Image section

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography Actual Kaihei 2-51346 (JP, U)

Claims (3)

(57) [Claims] 1. A three-dimensional image display device using a lenticular plate in which one surface has cylindrical lenses arranged in parallel in the horizontal direction and the other surface has a flat surface, and a lenticular plate having a thickness less than the focal length of the cylindrical lens and for imaging. The screen plate and the flat surface side of the lenticular plate are laminated and integrated in the peripheral portion via a spacer, and the focal plane of the cylindrical lens group other than the peripheral portion through the air layer is the thickness of the spacer. Therefore, the image is determined to be almost on the image forming screen plate. On the image forming screen plate, an image in which a plurality of images having parallax is combined according to the characteristics of the lenticular plate is projected. A three-dimensional image display device having a configuration. 2. A three-dimensional image display device using a lenticular plate in which a cylindrical lens is horizontally arranged in parallel on one surface and the other surface is flat, and a lenticular plate having a thickness less than the focal length of the cylindrical lens and a parallax A panel that displays an image in which a plurality of images that have been combined according to the characteristics of the lenticular plate is laminated on the flat surface side of the lenticular plate through a spacer in the peripheral portion, and through an air layer. The three-dimensional image display device is characterized in that the focal plane of the cylindrical lens group other than the peripheral portion is determined to be substantially on the display surface of the panel by the thickness of the spacer. 3. A three-dimensional image display device using a lenticular plate in which cylindrical lenses are arranged in parallel on both sides in the horizontal direction at the same pitch, wherein a cylindrical lens is arranged in parallel on one surface and the other surface is flat. , A lenticular plate on the observer side having a thickness less than the focal length of the cylindrical lens and a lenticular plate on the same projection side, both lenticular plates sandwiching the imaging screen plate, and are flat surfaces of each other. On the side, the focal planes of the cylindrical lens groups other than the peripheral portion, which are laminated and integrated to the peripheral portion via the air layer, are almost both formed by the thickness of the spacer so that the focal planes of the cylindrical lens groups are substantially the same. It is set so that multiple images with parallax are projected on the lenticular plate on the projection side by multiple projectors. A three-dimensional image display device having the following configuration.