JP2022166783A - Picture display panel - Google Patents

Abstract

To provide a picture display panel that can be used when a surface for displaying a picture is not flat.SOLUTION: In a picture display panel 1 in which a picture display element made of a plurality of pixels is arranged, a plurality of light guide elements 3 for guiding light on a pixel-by-pixel basis in relation to at least a part of the pixels are two-dimensionally attached to a surface which discharges picture light of the picture display element 2, so that picture light is emitted from an end surface 4 of the light guide element and the surface for discharging picture light is formed into a desired shape by setting the height of an end surface of the light guide element or the shape of an end surface.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to an image display panel that is used when the surface on which an image is displayed in an image facility or an image device is actively illuminated without projection, and more specifically, it is used when the surface on which an image is displayed is not flat. It relates to a video display panel.

When displaying images such as videos and still images related to astronomy, space, and the earth such as planetariums, academic videos and still images, entertainment images such as movies and still images, etc. Attempts have been made to display an image in a dome of a dome-shaped image facility consisting of or a portion thereof, and to display an image on the surface of a model, such as an exhibition of a three-dimensional model of terrain.

In the above technology, when displaying images, projection from a stellar ball in a planetarium or a projector is generally used (Patent Documents 1 to 3).

On the other hand, as an alternative to the conventional technology, it has been proposed to display an image by actively emitting light by using an image display element instead of projection on a surface for displaying an image (Patent Documents 4 and 5).

The above technology has the advantage of eliminating the need to arrange the planetarium's stellar sphere and the projector inside the dome, thereby eliminating restrictions on seating arrangements and audience conductors. In addition, as for the model, images are displayed by projection mapping, and although it could only be exhibited in a dimly lit room, it has the advantage of being able to be exhibited in a bright room.

Regarding the above technology, there is known a spherical image display device in which rectangular image display elements are tiled on the surface of a sphere by applying the well-known technique of tiling image display elements (Patent Document 6). (Non-Patent Documents 1 and 2).

JP-A-59-172674 Japanese Patent No. 4538352 Japanese Patent No. 4355508 Japanese Patent Publication No. 6-42119 JP-A-5-27666 JP 2004-191487 A Notice of Delivery of Aurora Vision OLED for "Geo-Cosmos", National Museum of Emerging Science and Innovation, July 16, 2012 Internet search, URL (http://www.mitsubishielectric.co.jp/news/2011/pdf/0601.pdf ) National Museum of Emerging Science and Innovation permanent exhibition, July 16, 2012 Internet

However, conventional image display devices were generally based on flat displays such as liquid crystal displays, plasma displays, and LED displays, so they could only take a flat surface or a shape with a curvature in only one direction. .

Therefore, if the surface for displaying images such as a planetarium has a spherical surface or other three-dimensional shape, display using these image display elements cannot be performed. had to.

However, in order to divide a spherical projection plane into a large number of small planes, for example, it is necessary to manufacture image display elements of various shapes. In image display elements such as LED display elements and LCD display elements, it is necessary to form an electronic circuit or the like according to the shape thereof.

Moreover, when it is implemented, it is necessary to prepare a large number of spare video display panels of various shapes in advance as a countermeasure against troubles, and there is a problem in terms of maintenance.

SUMMARY OF THE INVENTION The present invention has been created in view of the above-described problems of the prior art, and an object of the present invention is to provide an image display panel that is used when an image is displayed on a non-flat surface.

That is, in the image display panel of the present invention, in which an image display element composed of a plurality of pixels is arranged, the surface of the image display element emitting image light corresponds to all or part of the individual pixels. By arranging and attaching a plurality of light guide elements in a two-dimensional manner to guide light for each pixel, image light is emitted from the end surface of the light guide element, and the surface emitting the image light is light-guided. It is characterized in that it can be formed into an arbitrary shape by setting the height of the end face of the element and the shape of the end face.

Here, the term "light guide element" refers to a member having the property of guiding light incident on one end face to the other end face and emitting the light from the other end face, examples of which include optical fibers and light guide rods made of transparent resin. .

According to a second aspect of the present invention, in the image display panel, the image display element is composed of a light-emitting element.

According to a third aspect of the present invention, in the image display panel, the image display element is composed of a liquid crystal display element irradiated with light from a light source.

According to a fourth aspect of the present invention, in the above image display panel, the end surface of the light guide element for emitting image light is roughened.

According to a fifth aspect of the present invention, in the image display panel, a mask for blocking part or all of the light is attached to the end surface of the light guide element emitting the image light.

A sixth aspect of the present invention is characterized in that, in the image display panel, a reflecting film for reflecting light is formed on the end surface of the light guide element from which image light is emitted.

According to a seventh aspect of the present invention, in the image display panel, at least a portion of the light guide element is attached with an inclination with respect to the image display element.

According to an eighth aspect of the invention, in the image display panel, the light guide element and the image display element are separable, and at least one of them is replaceable.

Since the requirement to display images on spherical and other shapes is primarily for large-scale video installations, the individual pixels that make up the image are often a few millimeters.

Therefore, for the image display panel of the present invention, a transparent resin light guide rod or the like can be used instead of fine optical fibers or the like, and the surface can be processed with a general cutting or polishing tool.

For this reason, even during maintenance, instead of preparing a spare image display panel whose shape has been determined in advance, an image display panel with a shape that can be used for general purposes is prepared, and the shape is processed as necessary. and perform maintenance. Of course, most of the defects in the image display panel occur in the image display elements. Therefore, if the image display panel is configured so that only the image display elements can be replaced, it is possible to replace only the image display elements in which a defect has occurred. Just do it.

Furthermore, since image display elements used for large-sized image display are often standardized, if they are used for the image display element of the present invention, a more inexpensive image display panel can be constructed.

Of course, for example, in a high-definition image display panel that uses a large liquid crystal display as an image display element, by using optical fibers as a light guide element, the image display panel has a high-definition image display surface with a complicated shape. can be realized. As a result, for example, in the exhibition of a three-dimensional model of terrain, the model itself can be constructed according to the present invention, and the display can be switched to a map or image, or the seasonal changes of the earth's surface can be displayed in the same bright room as other exhibitions. can be done with Until now, such an exhibition had to be realized only by projection mapping, and had to be exhibited in a dimly lit room.

1 is a perspective view of an image display panel according to the present invention; FIG. The same as the above, the perspective view of a different Example. The same as the above, the perspective view of a different Example. Same as the above, conceptual diagram of a different embodiment. The same as the above, the perspective view of a different Example. The same as the above, the perspective view of a different Example. The same as the above, the perspective view of a different Example. The same as the above, the perspective view of a different Example. The same as the above, the perspective view of a different Example. The perspective view which shows the usage example of the image display panel of this invention. The perspective view which shows the usage example of the image display panel of this invention.

Hereinafter, specific examples of the image display panel of the present invention will be described with reference to the accompanying drawings. The image display panel of the present invention is used when the surface on which images are displayed in an image facility or an image device actively emits light without depending on projection. A plurality of sheets are tiled and laid out for use.

FIG. 10 is a diagram showing an example in which the image display panel 1 of the present invention is spread inside the dome surface of the image facility D, and FIG. .

FIG. 1 shows the basic shape of an image display panel 1 according to the present invention. In the image display panel 1, a plurality of light guide elements 3 for guiding light for each pixel corresponding to all or part of the individual pixels are provided on the image light emitting surface of the image display element 2 composed of a plurality of pixels. are arranged and attached in a two-dimensional manner.

With the above configuration, the light flux emitted from the image displayed on the image display element 2 is output from the other end surface 4 of the element by the light guide element 3, and the end surface functions as if it were the image display element. It becomes the image display surface to be displayed.

The light guide element 3 is a member having a property of guiding light incident on one end face to the other end face and emitting the light from the other end face, and examples thereof include an optical fiber and a light guide rod made of transparent resin.

Further, the image display element 2 is composed of a light-emitting element such as an LED display element or an LCD display element, and is composed of a liquid crystal display element irradiated with light from a light source.

The surface of the image display panel 1 that emits the image light is formed in an arbitrary shape by setting the height of the end surface 4 of the light guide element 3 and the shape of the end surface. Here, an example is shown in which the height of the light guide element 3 at the central portion is lower than that of the peripheral light guide elements 3, and the shape of the end surface 4 of the light guide element is inclined toward the central portion to form a concave surface. However, a convex surface or a surface shape with corners may be used.

Further, in order to prevent crosstalk of light for each pixel constituting an image, it is effective to interpose a light shielding member between the image display element and the light guide element or between the light guide elements.

It is better to fix the shape of the assembly of the light guide elements 3 by adhesion or the like in advance, and then combine them with the image display element 2. However, the optical coupling efficiency with the image display element is high. For the purpose of increasing the height of the image display panel, the image display panel according to the present invention may be formed by directly adhering the individual light guide elements to the image display element.

The image display panel of the present invention is a self-luminous image display panel that actively emits light. As is the case with many self-luminous image display panels, the viewing angle of the image must be sufficiently wide. must. For this reason, the image display surface of the light guide element is processed to be a rough surface so that the light is scattered in all directions unless there is a particular need. Of course, it may be realized by sticking a scattering material on the image display surface of the light guide element.

On the other hand, depending on the image to be displayed, it may be necessary to intentionally not roughen the end faces of the light guide element for the purpose of limiting the viewing angle of the image, or to make the individual end faces slanted so that the light beam is emitted in a specific direction. It may function as an optical barrier.

Further, when it is required to synthesize a displayed image and a projected image by a projector or the like, as shown in FIG. Alternatively, a member 6 having a diffusing surface may be attached to the surface of the image display panel so that the image display panel efficiently diffuses and reflects the projected image.

Of course, the same effect can be obtained by forming a half-mirror-like screen with a metal thin film or the like on the end surface of the light guide element. The reflectance and the like in these cases should be determined in consideration of the amount of luminous flux of the image display device and the amount of luminous flux of the projected image.

A large image display device exceeding the size of the image display element 2 can be realized by combining a large number of image display panels. However, depending on the shape of the surface to be displayed, there are many cases that cannot be realized only with a rectangular image display panel. In this case, as shown in FIG. 4, a structure in which the image of only a part of the image display element 2 is guided by the light guide element and no light guide element is provided in the remaining pixels 2A, or a light guide element is used. A three-dimensional surface shape may be formed by using a structure in which the image sensor 3 is arranged obliquely with respect to the image plane of the image sensor 2 .

As a typical example, FIG. 5 shows an example of division of the video display panel in the pole portion 10 when forming a spherical surface.

Here, the image display panel to which the symbol A is assigned is an AA-shaped panel, the image display panel to which the symbol B is assigned is a BB-shaped panel, and the panel to which the symbol C is assigned is a CC-shaped panel. use. In both cases, the image display element 2 is the same, but the shape and length of the light guide element 3 are different.

Similarly, for other stereoscopic image planes, an image display panel using a single image display element can be used to construct an image display plane.

In the case of a planetarium having a hemispherical image display surface, or in the case of an immersive virtual reality experience device CAVE (Cave automatic virtual environment) in which all four sides are image display surfaces, If the surface is a dense image display surface, the echo of sound is large, which is not preferable in terms of acoustic effects. In such a case, a projection screen is generally used in which a small opening is provided on the projection surface to suppress sound reflection. In the image display panel of the present invention as well, such openings leave the gaps between the light guide elements as shown in FIGS. Alternatively, as shown in FIG. 7, a sound absorbing material 7 may be attached to the hole. In addition, when sound echo suppression is not sufficient, a structure may be employed in which a part of the light guide element and the image display element is removed to increase the opening.

It should be noted that while examples of image display panels with pixels arranged vertically and horizontally have been shown so far, the pixels may be arranged in a staggered manner as shown in FIG. 7 to increase the pixel density. As shown, the shape of the light guide element may be polygonal.

On the other hand, in recent years, there are also large-sized video monitors using a liquid crystal display element or the like. By using this as an image display element, a high-resolution image display panel with a high pixel density can be configured. If the image display element is large, the light guide element block will also be large and difficult to manufacture. Also, if the screen has a complicated image display surface, it may be difficult to process it.

In the present invention, the resolution per unit length of an image to be displayed depends on the dimensions of the light-emitting elements forming the pixels of the image display element. However, in a light-emitting device such as an LED, the size of the light-emitting portion is smaller than the size of the device. By forming an image display panel in which the light guide element on the side with an arbitrary surface shape is in close contact with the image display panel, the image display panel has a resolution (number of pixels per unit length) higher than that of the image display element. can be configured. Of course, it is also possible to form an image display panel that similarly lowers the resolution, and it is possible to provide an image display panel with a high degree of freedom.

In addition, by using a light guide element that is narrower than the pixel interval of the image display element in advance, even when a higher resolution image display is required, it is sufficient to replace the image display element with a higher resolution image display element. It is not necessary to redesign and manufacture all the wide variety of image display elements as in the above, and equipment can be updated at a lower cost.

REFERENCE SIGNS LIST 1 image display panel 2 image display element 2A pixel 3 light guide element 4 end surface of light guide element 5 material that diffusely reflects gaps 6 member having a diffusion surface 7 sound absorbing material D image facility M image device

Claims (8)

In an image display panel in which an image display element composed of a plurality of pixels is arranged, a plurality of light guides corresponding to all or part of the individual pixels are provided on the image light emitting surface of the image display element. By arranging and attaching the light guide elements in a two-dimensional shape, the image light is emitted from the end surface of the light guide element, and the surface from which the image light is emitted is set by the height of the end surface of the light guide element and the shape of the end surface. An image display panel characterized by being formed into an arbitrary shape by 2. The image display panel according to claim 1, wherein the image display elements are composed of light emitting elements. 2. The image display panel according to claim 1, wherein the image display element is composed of a liquid crystal display element irradiated with light from a light source. 3. The image display panel according to claim 1, wherein the end surface of the light guide element for emitting image light is roughened. 5. The image display panel according to any one of claims 1 to 4, wherein a mask for blocking part or all of the light is attached to the end surface of the light guide element from which the image light is emitted. 6. The image display panel according to any one of claims 1 to 5, wherein a reflection film for reflecting light is formed on an end surface of the light guide element from which image light is emitted. 7. The image display panel according to any one of claims 1 to 6, wherein at least part of the light guide element is attached with an inclination with respect to the image display element. 8. The image display panel according to claim 1, wherein the light guide element and the image display element are separable, and at least one of them is replaceable.

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