JP2002139798A - Light induction panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light induction panel which projects videos on both surfaces of a screen. SOLUTION: The incident digital image on a screen body 1 is reflected by a reflecting film 5 through a panel plate 3 on the front surface and is transmitted through the reflecting film 5. The digital image reflected by the reflecting film 5 is passed again through the panel plate 3 on the front surface and is led outside. The digital image transmitted through the reflecting film 5 is passed through the panel plate 4 on the rear surface and is led outside. When the light passes an oblique light lens 7 constituting the respective panels 3 and 4, the scattering approximate to the perfect diffusion occurs in the direction orthogonal with the longitudinal direction of fiber bundles. Since the individual fibers within the oblique light lens 7 corresponding to one pixel, the light obtained from the screen body 1 may be distinctly projected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light guide panel used for a multimedia display screen or the like.

[0002]

Generally, as a light guide panel of this type, a reflection type screen which reflects light from a projector is known as a multimedia display screen for a projector such as an OHP, a slide or a projector.

[0003] When such a light guide panel is used particularly as a multimedia display screen, it is desired that an image projected from a projector can be seen in a clear room with sufficient brightness even in a bright room. However, if the digital image from the projector is simply projected on an existing screen as it is, the screen image disappears and becomes invisible only by illuminating a halogen light of about 500 W. Further, simply projecting a digital image as it is cannot obtain a resolution higher than the image element amount (900 to 2.7 million pixels), which is the performance of the projector itself, and this makes it difficult to view a screen image in a bright room. Thus, there has been a problem that a clear screen image cannot be obtained.

Further, in a display screen that reflects the light emitted from the projector to the screen, an image can be projected only on the surface of the screen. For this reason, the rear side of the screen becomes a completely useless space, and this type of screen is often installed on a wall surface or the like, and the installation position is restricted. In particular, in recent years, this type of screen tends to be larger, and there are many useless surfaces in terms of space.

An object of the present invention is to solve the above-mentioned problems, and to provide a light guide panel capable of obtaining clear and sufficient brightness of the light led out to the outside and capable of displaying images on both sides. Its purpose is to

[0006]

According to a first aspect of the present invention, there is provided a light guide panel including a light diffuser having a fine fiber bundle structure having a light diffusing action, and the light diffuser. A flat panel plate, the panel plates are superposed on the front and back, and a light-transmitting reflective layer is interposed between the panel plates, so that the image projected on the one panel plate can be displayed on the front and back panel plates. It is composed.

With the above structure, the light incident on the screen main body passes through the light diffuser constituting the front panel plate, is reflected by the reflection layer, passes through the light diffuser on the surface again, and is guided to the outside. At the same time, the light that has passed through the reflective layer passes through the light diffuser that forms the back panel plate and is led out. This makes it possible to project an image on both sides of the screen body. When light passes through this light diffuser, scattering close to perfect diffusion occurs in a direction orthogonal to the longitudinal direction of the fiber bundle, and the viewing angle is greatly expanded. In addition, since each fiber in the light diffuser corresponds to one pixel, light obtained from the screen main body is more clearly displayed. As a result, it is possible to obtain clear and sufficient brightness of the light guided to the outside.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the light diffuser is formed of clinite.

The plagioclase is produced by heating and dissolving an optical glass material to remove a plurality of elements (impurities) contained therein and cooling and solidifying only a pure material. 1000 to 11 per square millimeter
As many as 100 fine fiber bundles are formed, the diameter of the fibers becomes about half the wavelength of visible light. In this case, the light is completely diffused in the clonite, and the light guided to the outside becomes clearer and has a sufficient brightness.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the light guide panel according to the present invention will be described below with reference to the accompanying drawings. The light guiding panel in the present embodiment is applied to a multimedia display screen.

In FIGS. 1 and 2 showing the overall configuration of a multimedia display screen, reference numeral 1 denotes a screen main body, and 2 denotes a frame for holding the screen main body 1. The screen main body 1 is different from that shown in the above-mentioned Japanese Patent No. 2611190, and is entirely a plate (flat plate) having no curvature, having a width of 3000 to 10000 mm and a height of 2500 to 5000 m.
It has an overall dimension of m.

FIG. 3 is a longitudinal sectional view of the screen main body 1. In FIG. 1, a screen main body 1 is configured by bonding two panel plates 3 and 4 to each other.
A reflection film 5 as a reflection layer is interposed therebetween.
The front and back panel plates 3 and 4 thus superimposed with the reflection film 5 interposed therebetween are held by the frame 2. The frame 2 is formed of, for example, a light metal material such as aluminum, and a plurality of legs 2A that support the screen main body 1 in an upright state are attached to a lower portion thereof. The reflective film 5
Has a light-transmitting property that reflects light such as an image or sunlight incident on the screen main body 1 while reflecting light incident on the screen main body 1. In this case, the transmittance of the reflective film 5 is approximately 55%.
Is set to That is, 45% of the light, such as an image and sunlight, incident on the screen main body 1 is reflected on the front panel panel 3, and 55% of the light is transmitted through the reflective layer 5 toward the rear panel panel 4. .

In manufacturing the reflection film 5, a surface of a base material made of polyvinyl chloride having a thickness of 1100 μm is
It is formed by applying a special coating layer 6 having a thickness of 100 μm on both sides. The coating layer 6 of the reflection film 5 is to be a luminescent image screen, and uses a small amount of diamond powder in addition to carbon, alumina, clinite fine powder, silicon and silicon as a mixture of paint and pigment. These are sprayed on the surface of the base material (metal system). The reflection film 5 uses a member that does not reflect ultraviolet light or the like at all. This is to avoid the adverse effects of ultraviolet rays contained in outdoor sunlight. Reference numeral 7 denotes a light diffuser constituting the panel plates 3 and 4, which has a fine fiber bundle structure therein. In this embodiment, a special material called clinite (hereinafter, clinite) is used. Lens). The clinite here means a plurality of elements (impurities) contained in an optical glass material by heating and melting
, And only pure ones are formed by cooling and solidifying. Specifically, inside the melting furnace (pot),
While using a special platinum plate for the refractory brick floor and using tangalon powder, while melting point, flowing and stirring,
While changing the temperature from 800 ° C to 100 ° C to 1200 ° C to 135 ° C to 2200 ° C, degassing and removal of the glass material is performed at 2200 ° C. After performing this once every three days, it is cooled over three to four days, a solid ingot is taken out of the melting furnace, and this is subjected to a seven-step finish in which the solid ingot is ground into a predetermined shape by a cutting machine such as a diamond cutter. I have. In the thus obtained plagioclase glass, the diameter of the fiber of the medium inside is formed to be about half the wavelength of visible light through the above series of manufacturing processes. Further, inside the oblique glass, 1000 to 1100 fiber bundle elements (structures), each of which is round and free from distortion, are formed per square millimeter.

The oblique stone lens 7 obtained in the above manufacturing process
As shown in FIG. 4A, the outer diameter section is formed as a cylindrical lens having a convex lens surface 8 formed on the front side and a flat surface 9 having no irregularities on the back side. After that, as shown in FIG.
The lens surface 8 side is cut to form a flat portion 10, and the inclined portions 10 A are formed on both side edges of the oblique stone lens 7,
Further, as shown in FIG. 4 (C), a quartz layer 11 is formed on the flat surface 9 side by vacuum adhesion to finally obtain a plagioclase lens 7 as a plagioclase light diffuser in a rectangular plate shape. . The reason why the quartz layer 11 is formed last is to improve the durability and heat resistance of the sparlite lens 7.

Next, the operation of the above configuration will be described with reference to FIGS. FIGS. 6 and 7 each show a state in which a digital image from the projector 21 as a light source is projected on the screen main body 1. However, in FIG. 6, the projector 21 is arranged substantially above the screen main body 1 (upper projection), whereas in FIG. 7, the projector 21 is arranged substantially lower than the screen main body 1 (lower projection).

6 and 7, the digital image D (light) from the projector 21 passes through the oblique stone glass 7 constituting the front panel 3, and the digital image D is reflected. While being reflected by the film 5, it is transmitted through the reflective layer 5 and is incident on the oblique stone lens 7 constituting the rear panel panel 4. That is, the reflection layer 5 interposed between the front and back panel plates 3 and 4 has transparency, and although 45% of the digital image D incident from the front panel plate 3 is reflected by the reflection layer 5, the digital image D 55% are transmitted through the reflective layer 5 and directed toward the rear panel panel 4. Thereby, the reflected light R reflected by the reflection film 5 passes through the oblique stone lens 7 constituting the front panel panel 3 again, and is projected on the front panel panel 3 as an analog visual image A. On the other hand, the transmitted light R1 transmitted through the reflection film 5 passes through the oblique stone lens 7 constituting the rear panel panel 4, and
The image is projected on the rear panel panel 4 as an analog visual image A. Thus, a single projector 21
, The digital image D projected from the front panel panel 3 and the rear panel panel 4 can be simultaneously projected. Each visual image A obtained from each of the panel plates 3 and 4 is shifted by step-polarized light in the vicinity of the screen main body 1, but as the distance from the screen main body 1 is increased, the deviation of both visual images A disappears. Thus, a stereoscopic visual image A having no step polarized light is obtained.

When the diameter of the fiber inside the oblique lens 7 is about half the wavelength of the visible light in particular, when the image ray from the projector 21 passes through the oblique stone lens 7, the inside of the oblique stone lens 7 In the direction perpendicular to the longitudinal direction of the fiber bundle in the above, scattering close to complete diffusion occurs (Mie's theory of diffusion). For this reason, strong light is directed in directions other than the regular reflection by the reflection film 5 on the back surface side of the oblique stone lens 7, and a state close to perfect diffusion occurs, and the viewing angle is greatly widened. In particular, since scattering does not occur in a direction parallel to the longitudinal direction of the fiber bundle, if the oblique stone lens 7 is arranged so that the fiber bundle is oriented vertically, light is efficiently diffused in the horizontal direction. The upper projection as shown in FIG. 6 has less escape of light to the viewer O, and a brighter and clearer stereoscopic visual image A can be obtained than the lower projection shown in FIG. Incidentally, in the upper projection shown in FIG. 6, the stereoscopic visual image A can be seen at a luminous reflectance of 95% with respect to the incident light, but in the upper projection shown in FIG. You will see the stereoscopic visual image A at a rate.

The light scattering effect also occurs when the image light beam reflected by the reflection film 5 exits through the oblique lens 7. For this reason, in the reciprocation of the image light beam passing through the oblique light lens 7, the fiber bundle splits the light beam by 100 times (150 times at the maximum), and the amount of the light beam derived from the screen main body 1 increases. Further, since each fiber in the oblique light lens 7 corresponds to one pixel of the analog visual image A, the sharpness far exceeds the image element amount of the digital image D from the projector 21 (close to the image element amount of the photographic film). ) Can be obtained. In particular, in this embodiment, 45% of the light incident on the screen main body 1 is reflected by the reflective layer 5 and the remaining 55% of the light is transmitted through the reflective layer 5, so that the conventional screen main body 1 has insufficient light quantity. And the display luminance of the digital image D is extremely low, but the amount of light is increased by the fiber bundle in the oblique stone lens 7, so that the shortage of light quantity can be effectively eliminated, resulting in extremely clear and high luminance. The digital image D is obtained.

Further, positrons can be captured by the action of alumina and carbon contained in the coating layer 6 of the reflective film 5, and the emission of a visual image can be promoted by charging. By using such beam plasma electron ions as the visual image A, a clearer emitted image can be obtained.
Regardless of the image quality, color tone, color depth, sharpness, and three-dimensionality, the visual image A obtained in this way is excellent as compared with other screens, and is used in various fields as a soft three-dimensional clear image. Can be. For example, when used in medical endoscopes and the like, the color tone of red blood cells and white blood cell crystals and protein and the consumption of hemoglobin can be clearly seen, and the visual image A can analyze the functions of human hair, sweat holes and skin. .

The oblique stone lens 7 also contains diamond powder for converting the three primary colors of light into five primary colors.
This is for providing a more beautiful color in the visual image A. Further, since the panel plates 3 and 4 composed of the oblique stone lens 7 have a flat plate shape and the reflection film 5 attached to the panel plate 3 also has an entire shape without a curve, the reflection film 5 as in the conventional example has a wide area. No significant light dispersion occurs, and together with the increase in the amount of light due to the fiber bundle in the oblique stone lens 7, the shortage of light amount, which is common in existing screens, can be more effectively eliminated.

As described above, the multimedia display screen 1 of the present embodiment has the transmissive reflective layer 5 interposed between the front and back panel plates 3 and 4.
Light incident on the screen main body 1 of the multimedia display screen, that is, the digital image D, passes through the oblique stone lens 7 and is reflected by the reflection film 5, passes through the oblique stone lens 7 again, and is led out to the outside, where The image is displayed on the panel plate 3. Further, the digital image D transmitted through the reflection layer 5 can be passed through the oblique stone lens 7 on the back side and can be displayed on the panel plate 4 on the back side. Therefore,
Although the conventional screen main body 1 can project an image only on one side, according to the present embodiment, the screen main body 1
The digital video D can be projected on both sides of the camera.
As a result, in the conventional screen main body 1, the rear side of the screen main body 1 is a dead space that does not function at all, and the place where the screen main body is installed is mainly limited by the wall surface, but images can be projected on both sides. In the screen main body 1 of the present embodiment, the screen main body 1 can be freely arranged without being restricted by the installation position. In addition, images D are displayed from both sides of the screen main body 1 with the screen main body 1 interposed therebetween.
It is extremely rational because it is possible to visually recognize the screen main body 1. In particular, in recent years, this type of screen main body 1 tends to be larger, and the screen main body 1 is capable of projecting an image on both sides. Is extremely convenient.

When the light R reflected by the reflection layer 5 and the light R1 transmitted through the reflection layer 5 pass through the oblique stone lens 7, the light R is scattered in a direction orthogonal to the longitudinal direction of the fiber bundle and almost completely diffused. And the viewing angle is greatly expanded. Further, since each fiber in the oblique light lens 7 corresponds to one pixel, light obtained from the screen main body 1 is more clearly projected. As a result, it is possible to obtain clear and sufficient brightness of the light guided to the outside.

In this embodiment, in particular, the light diffuser 6 is formed by an oblique stone lens 7. The plagioclase is formed by heating and melting an optical glass material to remove a plurality of elements (impurities) contained therein, and cooling and solidifying only the pure one, and inside it is 1 square millimeter. As many as 1000 to 1100 fine fiber bundles are formed per fiber, and the diameter of the fibers becomes about half the wavelength of visible light. In this case, the light is completely diffused in the oblique stone lens 7 effectively, and the light guided to the outside becomes clearer and has a sufficient brightness.

Note that the present invention is not limited to the above-described embodiment, and various modifications can be made. For example, in the present embodiment, clinite obtained by a special manufacturing method is used as a light diffuser, but if the same performance can be manufactured at lower cost, it is replaced with clinite from the viewpoint of cost reduction. May be used as a light diffuser.

[0025]

According to the light guide panel of the first aspect of the present invention, a light diffuser having a fine fiber bundle structure having a light diffusing action therein, and a flat plate formed by the light diffuser are provided. With a panel plate, the panel plate is superposed on the front and back,
Since the light-transmitting reflective layer is interposed between the panel plates, and the image projected on the one panel plate can be displayed on the front and back panel plates, the image can be projected on both sides of the light guide panel. This makes it possible to obtain clear and sufficient brightness of the light led out from the front and back panel plates to the outside.

In the light guide panel according to a second aspect of the present invention, the light diffuser is formed of clinite, and in this case, the light guided to the outside is further sharpened and sufficiently bright. be able to.

[Brief description of the drawings]

FIG. 1 is an overall front view of a multimedia display screen showing a first embodiment of the present invention.

FIG. 2 is a perspective view of the screen main body.

FIG. 3 is a longitudinal sectional view of the screen main body.

FIG. 4 is a schematic explanatory view showing a process until the oblique light lens becomes a finished product.

FIG. 5 is a perspective view of a main part of the above.

FIG. 6 is a schematic explanatory diagram when performing the upper projection.

FIG. 7 is a schematic explanatory view when performing the upper and lower projection.

[Explanation of symbols]

 3,4 Panel board 5 Reflective film (reflective layer) 7 Oblique stone lens (light diffuser)

Claims (2)

[Claims] 1. A light diffusing body having a fine fiber bundle structure having a light diffusing action therein, and a flat panel plate formed by the light diffusing body. In addition, a light-guiding panel is characterized in that a light-transmitting reflective layer is interposed between the panel plates so that images projected on the one panel plate can be displayed on the front and back panel plates. 2. The light guide panel according to claim 1, wherein the light diffuser is formed of clinolite.