JP2021032973A - Image display system and image display method - Google Patents

Abstract

To provide an image display system and an image display method, capable of suppressing the situation of having an image projected at an unintended position by straight transmission light.SOLUTION: A display system 1 comprises: an image display plate 10 obtained by laminating a screen 12 for entering image light L1 irradiated from one surface to display an image including at least one of a moving image and a still image and a light angle control film 20 for covering the entire of the surface opposite to the one surface of the screen 12 to control a light angle viewed from the opposite surface; and an image projection device 60 arranged at a position distant from the one surface of the screen 12 and for irradiating the screen 12 with the image light L1. The screen 12 is obtained by laminating a transparent substrate 18 and a diffusion layer 16 for diffusing the image light L1. There is also provided an image display method.SELECTED DRAWING: Figure 1

Description

The present invention relates to a video display system and a video display method.

In recent years, digital signage (electronic signboard) that displays digital data as an image or a moving image via a video display device has become widespread as an application for introducing products and promoting stores. Since digital signage does not require objects such as posters and signboards, it enables real-time, low-cost and free production expression. As one of such forms, there is an image display method in which a show window, a window glass of a store, or the like is used as a screen, and a projector is projected from the back surface thereof. In addition, a video display method is also known in which a transparent film or the like provided inside a transparent case is used as a screen, and an image such as an image or a moving image is displayed three-dimensionally inside the case by projecting from the back of the screen. There is. By using a transmissive screen having appropriate translucency and light diffusivity for such a screen, it is possible to display a clear image or moving image while concealing the projector light source.

Patent Document 1 is a light-transmitting laminate in which a metal thin film layer and a light-diffusing layer are laminated on a thermoplastic resin film, and the light-diffusing layer is a thermoplastic resin and 10 to 60% by mass of light-diffusing particles. A transmissive projection screen (transmissive screen) containing the above is disclosed. Such a transmissive screen is excellent in color clarity and a hot spot suppression effect of a transmitted projection image particularly in a bright usage environment.

JP 2016-9149

However, when a transmissive screen as described above is used and a projector is projected from the back surface to display an image, linear transmitted light transmitted through the screen in a linear direction from the projector light source may be generated. In particular, in such an image display method, the light source is often installed above or below the screen in order to conceal the projector light source. However, when the light source is installed above the screen, such linear transmitted light is generated toward the ground on the observer side, so that the image may be projected to an unintended position such as the ground on the observer side. is there. Even when the light source is installed below the screen, such linear transmitted light is generated toward the ceiling on the observer side, so that the image is projected at an unintended position such as the ceiling on the observer side. There is a risk.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an image display system and an image display method capable of suppressing a situation in which an image is projected at an unintended position by linear transmitted light.

(1) The video display system according to the embodiment for achieving the above object is a screen that receives video light projected from one surface and displays a video including at least one of a moving image and a still image. An image display board formed by laminating a light beam angle control film that covers the entire surface of the screen opposite to the one surface and controls the light beam angle viewed from the opposite surface, and the screen. An image display system including an image projection device that is arranged at a position away from one surface and projects the image light onto the screen, wherein the screen is a transparent substrate and a diffuser that diffuses the image light. It is characterized in that it is formed by laminating layers.
(2) In the image display system according to another embodiment, preferably, the following (formula) is set between the angle of incidence of the image light on the screen with respect to the horizontal plane and the maximum light transmittance angle of the ray angle control film. It is characterized in that the relationship of 1) is established.
(Α1: Minimum incident angle of the image light on the image displayed on the screen, α2: Maximum incident angle of the image light on the image displayed on the screen, β: Maximum incident angle of the ray angle control film. Light transmittance angle.)
(3) In the image display system according to another embodiment, preferably, the angle of incidence of the image light on the horizontal plane with respect to the screen, the visible angle in the vertical direction of the ray angle control film, and the ray angle control film of the ray angle control film. It is characterized in that the following relationship (Equation 2) is established with the maximum light transmittance angle.
(Α1: Minimum incident angle of the image light on the image displayed on the screen, θ: visible angle in the vertical direction in the ray angle control film, β: maximum ray transmission angle of the ray angle control film.)
(4) In the image display system according to another embodiment, the following (Equation 3) is preferably between the vertical viewing angle of the ray angle control film and the maximum ray transmission angle of the ray angle control film. ) Is established.
(Θ: vertical visible angle in the ray angle control film, β: maximum ray transmittance angle in the ray angle control film.)
(5) In the image display system according to another embodiment, preferably, the ray angle control film is bonded to the screen with an adhesive layer interposed therebetween.
(6) In the image display system according to another embodiment, the ray angle control film is preferably bonded to the transparent substrate with the adhesive layer interposed therebetween.
(7) In the image display system according to another embodiment, preferably, the screen is provided with a hard coat layer on the projection surface of the image light.
(8) In the image display system according to another embodiment, preferably, the light ray angle control film includes louver layers in which light transmission bands and light shielding bands are alternately arranged, and the light shielding bands are the louver layers. It is characterized in that it is inclined parallel to the thickness direction or at a predetermined angle.
(9) In the image display system according to another embodiment, preferably, the ray angle control film is placed on a surface of the louver layer to be bonded to the screen and a surface opposite to the bonding surface of the louver layer to the screen. It is characterized by comprising a laminated transparent protective layer.
(10) In the image display system according to another embodiment, the diffusion layer is preferably characterized by containing diamond particles.
(11) The image display method according to one embodiment is an image display method using any one of the above-mentioned image display systems, and the image light projected from the image projection device is transmitted to the image display board. Light is emitted from the screen side, and the image light received on the screen is input to the ray angle control film, and the ray angle is controlled so that the observer on the ray angle control film side can see the image. Is displayed.

According to the present invention, it is possible to provide an image display system and an image display method capable of suppressing a situation in which an image is projected at an unintended position by linear transmitted light.

FIG. 1 shows a perspective view of a video display system according to the present embodiment. FIG. 2 shows a sectional view taken along line AA in the video display system shown in FIG. FIG. 3 shows a partially enlarged cross-sectional view (3A) of the image display board and an enlarged view (3B) of the region B in the cross-sectional view (3A). FIG. 4 shows a partially enlarged cross-sectional view (4A) of the louver layer and a view (4B) for explaining a method of manufacturing the louver layer. FIG. 5 shows a graph showing the angle dependence of the transmittance of the ray angle control film. FIG. 6 shows a diagram for explaining a modification 1 of the video display system according to the present embodiment. FIG. 7 shows a partially enlarged cross-sectional view of the modified example 2 of the image display board of FIG. 3 (3A).

Next, an embodiment of the present invention will be described with reference to the drawings. The embodiments described below do not limit the invention according to the claims, and all of the elements and combinations thereof described in the embodiments are indispensable for the means for solving the present invention. Is not always the case.

FIG. 1 shows a perspective view of a video display system according to the present embodiment. FIG. 2 shows a sectional view taken along line AA in the video display system shown in FIG. FIG. 3 shows a partially enlarged cross-sectional view (3A) of the image display board and an enlarged view (3B) of the region B in the cross-sectional view (3A).

As shown in FIGS. 1 to 3, the image display system 1 has a screen 12 for displaying an image including at least one of a moving image and a still image by injecting the image light L1 projected from one surface, and a screen. One of the image display board 10 and the screen 12 formed by laminating a light ray angle control film 20 that covers the entire surface on the opposite side of one surface of 12 and controls the light ray angle viewed from the opposite surface. It is provided with an image projection device 60 which is arranged at a position away from the surface and projects the image light L1 on the screen 12. Further, as shown in FIG. 3, the screen 12 is configured by laminating a transparent substrate 18 and a diffusion layer 16 for diffusing the image light L1. The image projection device 60 is preferably provided on the back side and above the screen 12.

In the present embodiment, the plane parallel to the image display board 10 is defined as the YZ plane including the Y-axis and the Z-axis orthogonal to each other, and the axis perpendicular to the YZ plane is defined as the X-axis (see FIG. 1). Further, as shown in FIG. 1, in the YZ plane, the axis parallel to the height direction of the image display system 1 is defined as the Z axis, and the axis orthogonal to the Z axis is defined as the Y axis. Further, in the present embodiment, the observer P side is defined as the front side and the image projection device 60 side is defined as the back side with respect to the image display board 10 (screen 12 and ray angle control film 20) (see FIG. 2). Further, in the present application, the "cross section" or "vertical cross section" means a cross section that cuts the image display system 1 along the XZ plane.

The schematic configuration of the video display system 1 and the constituent members of the video display system 1 will be described in more detail.

(1) Outline of Configuration of Video Display System In this embodiment, the video display system 1 is a system for three-dimensionally displaying images of characters and real people appearing in cartoons and animations, for example. In addition, in this embodiment, "three-dimensional display" means a display in which a character or the like appears to be floating in the air. The image display system 1 preferably includes an image display board 10, a case member 40, and an image projection device 60. The image display system 1 receives the image light L1 projected from the image projection device 60 from the screen 12 side of the image display board 10. Then, the image display system 1 causes the image light L1 that has entered the screen 12 to enter the ray angle control film 20, and controls the ray angle (hereinafter, also referred to as “visible angle”) to control the ray angle control film 20. The image is visually displayed to the observer P on the side. More specifically, in the video display system 1, the video output from the video projection device 60 is projected on the screen 12 of the video display board 10. The observer P can visually recognize the image projected on the screen 12 in this way through the ray angle control film 20 (see FIG. 2).

(2) Case member The case member 40 is preferably a housing formed of a resin such as an acrylic plate and accommodating the image display plate 10 and the image projection device 60. The case member 40 includes a pedestal 42, a display plate mounting portion 43, a display plate support portion 46, and a projection device support portion 48 (see FIGS. 1 and 2). The pedestal 42 is a member extending from the display board mounting portion 43 toward the back surface side of the image display board 10. The display board mounting portion 43 is a member on which the image display board 10 is mounted. Further, the area on the back side of the video display board 10 in the display board mounting portion 43 also functions as a table on which a character or the like projected on the video display board 10 is virtually placed. That is, the area on the back side of the image display board 10 of the display board mounting portion 43 can be made to look like a base base material of a display case that accommodates a doll or a model so that it can be displayed. Further, the display board mounting portion 43 may be patterned or colored in at least a part of the area such as the area on the back side of the image display board 10. The pedestal 42 and the display plate mounting portion 43 are preferably integrally molded members.

The display plate support portion 46 is a member that supports the image display plate 10 (see FIGS. 1 and 2). As shown in FIG. 1, the display plate support portion 46 is a substantially U-shaped member that is erected at both ends of the display plate mounting portion 43 and is formed so as to surround the image display plate 10. The projection device support portion 48 is a member that supports the image projection device 60 (see FIGS. 1 and 2). The projection device 60 is attached to the projection device support portion 48 at an angle and orientation capable of projecting the image light L1 projected from the image projection device 60 onto the screen 12. The projection device support portion 48 preferably has a projection device support surface 480 to which the image projection device 60 is attached, and a connecting surface 482 that connects the projection device support surface 480 and the display plate support portion 46, and has a side surface. It is a member that is visually bent into a substantially V shape (see FIG. 2). The shape and position of the projection device support portion 48 are not particularly limited as long as the image projection device 60 can be attached at an angle and orientation capable of projecting the image light L1 onto the screen 12.

(3) Image Projection Device The image projection device 60 is a device that is arranged at a position away from one surface of the screen 12 of the image display board 10 and projects the image light L1 on the screen 12, preferably the screen 12. This is a device that projects the image light L1 from the back surface (one surface described above) (see FIG. 2). The image projection device 60 is preferably a projector that outputs an image of a character or the like based on data stored in a medium such as a Blu-ray disc (BD), DVD, or memory or data distributed by a LAN line as image light L1. .. The image projection device 60 is provided on the projection device support portion 48. The image projection device 60 is preferably provided above the image display board. By arranging the image projection device 60 on the back side and above the image display board 10 in this way, it is possible to suppress a situation in which the image projection device 60 is visually recognized by the observer P through the image display board 10.

(4) Video Display Board The video display board 10 is a member in which a screen 12 and a light ray angle control film 20 are laminated (see FIG. 3). As shown in FIG. 3, the image display board 10 has a screen 12 and a light ray angle control film 20 bonded to each other with an adhesive layer 28 interposed therebetween. The adhesive layer 28 is a layer for joining the transparent substrate 18 of the screen 12 described later and the louver layer 22 of the ray angle control film 20 described later. The adhesive layer 28 is preferably formed of an adhesive that is transparent after curing. More specifically, the adhesive forming the adhesive layer 28 preferably has a light transmittance of 65% or more, and the adhesive having a light transmittance of 80% or more in a single body after curing. More preferred. As such an adhesive, a heat-curable adhesive, a multi-component reaction adhesive, an ultraviolet curable adhesive, etc., which have transparency after curing, are preferable, and for example, an epoxy adhesive, a urethane adhesive, and an acrylic. Preferable examples thereof include based adhesives, melamine based adhesives, polyester based adhesives, silicone based adhesives and the like. Further, it is more preferable that the adhesive layer 28 is formed of the same type of adhesive as the louver layer 22 described later. By forming the adhesive layer 28 in this way, good adhesion to the louver layer 22 can be obtained, and deterioration of visibility of the image due to the difference in refractive index between the louver layer 22 and the adhesive layer 28 is suppressed. can do. In this embodiment, the adhesive layer 28 is preferably formed of a silicone-based adhesive (refractive index 1.42).

(6-1) Screen The screen 12 is a member that receives the image light L1 projected from one surface and displays an image including at least one of a moving image and a still image. The screen 12 is a transmissive screen in which an image based on the image light L1 projected from the back surface (one surface described above) side by the image projection device 60 can be visually recognized from the front side. The screen 12 is a screen formed by laminating a transparent substrate 18 and a diffusion layer 16 (see FIG. 3). Further, the screen 12 preferably includes a hard coat layer 14 on the projection surface of the image light L1. The screen 12 preferably has a light transmittance of 85% or more, and more preferably 88% or more when light is transmitted in the X direction in FIG. Further, the screen 12 preferably has a HAZE value of 5 to 30, and more preferably a HAZE value of 10 to 20.

The transparent substrate 18 is a transparent plate-like member, preferably a flat or curved plate, or a plastic sheet-like member. The transparent substrate 18 is preferably made of a polymer resin or glass. As the polymer resin, a resin having excellent visibility of visible light is preferable. For example, polyvinyl butyral resin, polyester resin, acrylic resin, acrylic urethane resin, polyester acrylate resin, polyurethane acrylate resin, epoxy acrylate resin. Resin, urethane resin, epoxy resin, polycarbonate resin, cellulose resin, acetal resin, vinyl resin, polyethylene resin, polystyrene resin, polypropylene resin, polyamide resin, polyimide resin, melamine resin, Preferable examples thereof include thermoplastic resins such as phenol-based resins, silicone-based resins, and fluorine-based resins, thermocurable resins, and ionizing radiation curable resins. For example, a plasticizer such as triethylene glycol-bis-2-ethylbutyrate may be added to the polymer resin. As the glass, oxide glass such as silicate glass, phosphate glass and borate glass is preferable, and silicate glass, alkali silicate glass, soda lime glass, potash lime glass, lead glass and barium glass are preferable. , Sirate glass such as borosilicate glass is preferable. In this embodiment, the transparent substrate 18 is made of polyethylene terephthalate (PET) (refractive index 1.6). The thickness of the transparent substrate 18 is not particularly limited, but is preferably 10 μm to 50 mm, more preferably 20 μm to 30 mm.

The diffusion layer 16 is a layer that diffuses the image light L1, preferably a layer containing diamond particles 17 (see FIG. 3 (3B)). In this embodiment, the refractive index of the diamond particles 17 contained in the diffusion layer 16 is 2.42. The diamond particles 17 are preferably natural diamond particles or artificial diamond particles. As the artificial diamond, single crystal diamond or polycrystalline diamond is preferable, and one obtained by oxidizing a single crystal nanodiamond having a graphite phase obtained by an explosion method is more preferable. Such single crystal nanodiamonds have a core / shell structure in which the surface of diamond is covered with graphite-based carbon, and is colored black. Therefore, as the diamond particles 17 contained in the diffusion layer 16, it is preferable to use nanodiamond particles in which the graphite phase is almost completely removed by performing an oxidation treatment. Further, as the diffusion layer 16, in order to enhance the affinity with a solvent or the like, as the diamond particles 17, the surface of the diamond particles modified with silicon or fluorine may be used. In particular, the fluorinated diamond particles are excellent in dispersibility in the polymer resin and are suitable as the diamond particles 17 contained in the diffusion layer 16. The median diameter of the diamond particles 17 is preferably 0.01 to 1 μm, more preferably 0.01 to 0.03 μm. When the above-mentioned nanodiamonds are contained in the diffusion layer 16, the agglomerated nanodiamond particles are included in the diffusion layer 16 as diamond particles 17 so as to be included in the above-mentioned median diameter range. Is preferable.

As shown in FIG. 3A, the hard coat layer 14 is a layer provided on the projection surface of the image light L1 on the screen 12, and is formed by applying a hard coat agent on the diffusion layer 16. The screen 12 may be provided with an intermediate layer for enhancing adhesion between the hard coat layer 14 and the diffusion layer 16. The method for applying the hard coating agent is not particularly limited, and examples thereof include a bar coating method, a dip coating method, a flow coating method, a spray coating method, a spin coating method, and a roller coating method.

(6-2) Ray Angle Control Film The ray angle control film 20 covers the entire surface of the screen 12 opposite to the surface on which the image light L1 is projected, and controls the ray angle emitted from the opposite surface. It is a film. The ray angle control film 20 preferably includes a louver layer 22 and a transparent protective layer 26. Further, as shown in FIG. 3, the ray angle control film 20 preferably has a louver layer 22 and a transparent protective layer 26 bonded to each other with a film adhesive layer 24 interposed therebetween. The film adhesive layer 24 is a layer for joining the louver layer 22 and the transparent protective layer 26, and is preferably formed of an adhesive having transparency after curing. Since the adhesive forming the film adhesive layer 24 is the same as the adhesive forming the adhesive layer 28 described above, detailed description thereof will be omitted. In this embodiment, the film adhesive layer 24 is preferably formed of a silicone-based adhesive (refractive index 1.42).

FIG. 4 shows a partially enlarged cross-sectional view (4A) of the louver layer and a view (4B) for explaining a method of manufacturing the louver layer.

The louver layer 22 is a layer in which light transmission bands 30 and light shielding bands 32 are alternately arranged in the Z direction (see FIG. 4 (4A)). The light transmission band 30 and the light shielding band 32 in the louver layer 22 both extend in a band shape in the Y direction. The light-shielding band 32 is preferably parallel to the thickness direction (X direction) of the louver layer 22 or inclined at a predetermined angle S, and is inclined at a predetermined angle S with respect to the thickness direction. More preferably (see FIG. 4 (4A)).

As the material of the light transmission band 30, a resin having high transparency is preferably used. More specifically, the light transmittance when light is transmitted in the X direction in FIG. 4 (4A) is 75% or more, preferably 85% or more with respect to only the light transmission band 30. A resin material having high transparency is preferable. As such a resin material, for example, a highly transparent thermoplastic resin or a thermosetting resin is used, and more specifically, a cellulose resin, a polyolefin resin, a polyester resin, a silicone resin, a polystyrene resin, etc. Polyvinyl chloride resin, acrylic resin, polycarbonate resin and the like are preferable, and silicone rubber is more preferable. In this embodiment, the light transmission band 30 is made of silicone rubber (refractive index 1.42).

As the material of the light-shielding band 32, preferably, a coloring resin obtained by using the above-mentioned resin as the material of the light transmission band 30 as a base material and adding a colorant such as a pigment or a dye to the base material is used. The color tone of the light-shielding band 32 may be black, red, yellow, green, blue, light blue, or the like, as long as preferable light-shielding properties of the light-shielding band 32 can be obtained. The color tone of the light-shielding band 32 can be adjusted by the type and amount of the colorant added. More specifically, the light transmittance when light is transmitted in the X direction with respect to only the light-shielding band 32 is 40% or less. Preferably, it has a light-shielding property such that it is 10% or less. Specific examples of the colorant include general organic pigments such as carbon black, Benkara, iron oxide, titanium oxide, yellow iron oxide, disazo yellow, and phthalocyanine blue, or floating pigments. The colorant may be used alone or in combination of two or more. When a black pigment is not used as the colorant, it is preferable to use a white pigment in combination in order to obtain good light-shielding properties.

The width W1 of the light transmitting band 30 and the width W2 of the shading band 32 are the widths in the direction perpendicular to the interface between the light transmitting band 30 and the shading band 32 (see FIG. 4 (4A)). In the louver layer 22, the transmittance of light rays parallel to the X direction is the ratio of the width W1 of the light transmission band 30 and the width W2 of the light shielding band 32 in the louver layer 22 and the normal direction (X) of the surface of the louver layer 22. It is affected by the angle S (hereinafter, also referred to as “louver angle S”) formed by the direction) and the shading band 32. The width W1 of the light transmission band 30 is preferably 50 μm to 300 μm, more preferably 150 μm. The width W2 of the light-shielding band 32 is preferably 5 μm to 30 μm, more preferably 15 μm. The thickness T of the louver layer 22 in the X direction is preferably 100 to 350 μm, more preferably 190 to 290 μm.

As a method of manufacturing the louver layer 22, as shown in FIG. 4 (4B), first, the thickness of the first sheet 30a made of the constituent material of the light transmitting band 30 and the thickness made of the constituent material of the light shielding band 32 is formed. A plurality of sheets 32a of the louver W2 are alternately laminated, and the plurality of sheets are heated and pressed to form a block body in which the plurality of sheets are integrated. Next, the louver layer 22 can be obtained by slicing the block body on an oblique cut surface having a predetermined angle S1 (S1 = 90 ° + S) with respect to the sheet surface. The thickness (slice width) at the time of slicing is preferably the same as the above-mentioned thickness T.

The transparent protective layer 26 is a layer that protects the louver layer 22 and is laminated on the surface of the louver layer 22 opposite to the joint surface with the screen 12 (see FIG. 3). As the material of the transparent protective layer 26, a resin having high transparency is preferably used. More specifically, the light transmittance when light is transmitted in the X direction with respect to the single transparent protective layer 26 is preferably 75% or more, more preferably 85% or more, and is highly transparent. A resin material having properties is preferable. As such a resin material, for example, a polycarbonate resin, a polyester resin, an acrylic resin, a polyolefin resin (particularly, a cycloolefin polymer), and a cellulose resin are preferable, and a polycarbonate resin and a polyester resin are more preferable. In this embodiment, the transparent protective layer 26 is made of polycarbonate (refractive index 1.6). If the thickness of the transparent protective layer 26 in the X direction is too thin, a sufficient protective function cannot be obtained, and the thicker the thickness, the lower the light transmittance. Therefore, the thickness is preferably about 0.01 to 0.5 mm, preferably about 0.1. It is more preferably about 0.2 mm. Further, the resin constituting the transparent protective layer 26 may contain an ultraviolet absorber. As the ultraviolet absorber, for example, a cerium oxide-based ultraviolet absorber, a zinc oxide-based ultraviolet absorber, a titanium oxide-based ultraviolet absorber, or the like, which does not impair transparency, is preferable. It is preferable that these ultraviolet absorbers are made into fine particles. The particle size and the amount of the ultraviolet absorber contained in the transparent protective layer 26 can be appropriately set within a range in which a suitable light transmittance of the transparent protective layer 26 can be obtained.

In the image display board 10 configured in this way, since the light ray angle control film 20 is laminated on the screen 12, the light ray angle of the observer P who sees the image displayed on the screen 12 is controlled within a predetermined range. , The linearly transmitted light from the screen 12 can be shielded, and the situation where the image is projected to an unintended position by the linearly transmitted light can be suppressed. Further, in the image display board 10, since the screen 12 and the ray angle control film 20 are bonded to each other via the adhesive layer 28, an air layer exists between the screen 12 and the ray angle control film 20. Can be suppressed. When an air layer is present between the screen 12 and the ray angle control film 20, in addition to the image projected on the screen 12, the difference in refractive index between the screen 12 and the ray angle control film 20 and the air is large. As a result, scattering occurs at each interface between the screen 12 and the light ray angle control film 20 and the air due to the difference in the refractive index of light to generate an image, so that the image may be observed as a double image. It was. However, when the screen 12 and the light ray angle control film 20 are joined via the adhesive layer 28, the difference in refractive index between the screen 12 and the light ray angle control film 20 and the adhesive layer 28 is small, so that the screen 12 and the light beam Scattering due to the difference in the refractive index of light at each interface between the angle control film 20 and the adhesive layer 28 can be reduced, and the generation of a double image can be suppressed.

Next, the angle characteristics of the light beam angle control film 20 will be described in detail.

FIG. 5 shows a graph showing the angle dependence of the transmittance of the ray angle control film.

The light beam angle control film 20 has a characteristic that light incident from an incident angle in a transmission angle region is transmitted, but light incident from an incident angle in a non-transmission angle region is not transmitted. The light beam angle control film 20 preferably transmits light incident at an incident angle in the range of θ1 to θ2 around the maximum light transmittance angle β described later, but is in an angle range θα outside the range of θ1 to θ2. It has the characteristic that light incident at an incident angle of (θα <θ1 and θα> θ2) is not transmitted (see FIG. 4 (4A)). That is, the visual field range that can be seen by the observer P through the light ray angle control film 20 is in the range of θ1 to θ2, and the visible angle θ that is the angle of the visual field range is (θ2-θ1) (FIG. 3 (3A)). As for the transmittance (total light transmittance) of such a light ray angle control film 20, for example, as shown in FIG. 5, the total light transmittance becomes the highest at the maximum light transmittance angle β, and the maximum light transmittance angle β It has an angle dependence such that the total light transmittance decreases as the distance from the light increases. Theoretically, in the graph of FIG. 5, the visible angle is the angle range in which the total light ray transmission rate of the light ray angle control film 20 is larger than 0%, but the region where the total light ray transmission rate is low is the diffraction of light. Since there is a possibility that the value of the total light transmittance is measured under the influence of, in the present embodiment, the angle (θ2-θ1) in the range of θ1 to θ2 at which the total light transmittance is 5% or more is set. , The visible angle θ of the light ray angle control film 20. Further, the maximum light transmittance angle β and the visible angle θ can be appropriately set by designing the light ray angle control film 20, and the angle to be set can be appropriately determined according to the purpose of use of the screen 12. Just do it. Further, the transmittance when the light incident at the maximum light transmittance angle β passes through the light ray angle control film 20 is preferably 60% or more, and more preferably 80% or more. In the present embodiment, the incident angle is the angle formed by the normal direction (X direction) of the surface of the image display plate 10 (screen 12 and the ray angle control film 20) and the incident lights L1, L11, and L12. Shown.

The light beam angle control film 20 composed of the louver layer 22 designed in this way is centered on light L1 (light incident at an angle β) parallel to the joint surface between the light transmission band 30 and the light shielding band 32 with respect to the joint surface. Light in the angle range from the light L11 having an inclination of (β-θ1) to the light L12 having an inclination of (θ2-β) with respect to the joint surface is transmitted, and the inclination with respect to the joint surface is within this range. It has the property of not transmitting light from an out-of-angle range. The ray angle control film 20 composed of such a louver layer 22 limits the angle (visible angle) θ through which light is transmitted to (θ2-θ1). That is, the visual field range that the observer P can see is limited to the range of θ1 to θ2 centered on β.

In the image display system 1, the following (Equation 1) is formed between the incident angles α1 and α2 of the image light L1 on the screen 12 with respect to the horizontal plane (XY plane) and the maximum light transmittance angle β of the light ray angle control film 20. It is preferable that the relationship of Here, α1 is the minimum incident angle (°) of the image light L1 on the image 100 displayed on the screen 12, and α2 is the maximum incident angle (°) of the image light L1 on the image 100 displayed on the screen 12. , Β mean the maximum light transmittance angle (°) of the light ray angle control film 20 (see FIG. 3 (3A)). That is, in the present embodiment, since the image light L1 is projected onto the screen 12 from the back side and above of the screen 12, the minimum incident angle α1 is the incident angle of the image light L1 projected on the upper end of the image 100. The maximum incident angle α2 is the incident angle of the image light L1 projected on the lower end of the image 100 (see FIG. 3 (3A)).

Further, in the image display system 1, the incident angle α1 of the image light L1 on the screen 12 with respect to the horizontal plane (XY plane), the visible angle θ in the vertical direction (Z direction) of the ray angle control film 20, and the ray angle control film It is preferable that the following relationship (Equation 2) holds with the maximum light transmittance angle β of 20. Here, α1 is the minimum incident angle (°) of the image light L1 on the image 100 displayed on the screen 12, θ is the visible angle (°) in the vertical direction of the ray angle control film 20, and β is the ray angle control. It means the maximum light ray transmission angle (°) of the film 20 (see FIG. 3 (3A)).

Further, in the image display system 1, between the visible angle θ in the vertical direction (Z direction) of the ray angle control film 20 and the maximum ray transmittance angle β of the ray angle control film 20, the following (Equation 3) It is preferable that the relationship holds. Here, θ means the vertical visible angle (°) of the light ray angle control film 20, and β means the maximum light transmittance angle (°) of the light ray angle control film 20 (see FIG. 3 (3A)). ..

In the image display system 1, it is preferable to use as the light ray angle control film 20 a film in which a visible angle θ and a maximum light transmittance angle β that satisfy the above-mentioned (Equation 3) are set. Further, in the video display system 1, it is preferable that each component is arranged so as to satisfy the above-mentioned (Equation 1) and (Equation 2). By configuring the image display system 1 in this way, it becomes easy to visually recognize the rear view, so that an image 100 (hereinafter, also referred to as “projection image 100”) of a character or the like displayed on the screen 12 floats in the air. It can be visually recognized by the observer P as if it were. The back landscape means a landscape that is visually recognized by the observer P on the back surface of the projected image 100 through the screen 12. Further, by configuring the image display system 1 in this way, the observer P can visually recognize a good projection image 100 over a wide range of the visible angle θ. Generally, when the image light L1 is projected from the back surface of the screen 12 to display the image 100, linear transmitted light transmitted through the screen 12 in a linear direction may be generated from the image projection device 60. In order to block such linearly transmitted light, it is conceivable to laminate a low-transmittance film on the screen 12, but the low-transmittance film makes it difficult to visually recognize the rear landscape, and the projected image 100 is in the air. It is difficult for the observer P to visually recognize the image as if it were floating on the screen. However, in the video display system 1, by arranging each component so as to satisfy the above-mentioned (Equation 1) to (Equation 3), the generation of linear transmitted light is reduced, and an unintended position such as a ceiling or a floor is used. It is possible to suppress the situation where the image is projected on the ceiling.

(Action / effect of each embodiment)
As described above, the image display system 1 receives the image light L1 projected from one surface and displays an image including at least one of a moving image and a still image, and one of the screen 12 and the screen 12. An image display board 10 formed by laminating a light ray angle control film 20 that covers the entire surface on the opposite side to the surface and controls the light ray angle viewed from the opposite side, and a position away from one surface of the screen 20. The image projection device 60, which is arranged in the screen 20 and projects the image light L1 on the screen 20, is provided. Further, the screen 20 is a member formed by laminating a transparent substrate 18 and a diffusion layer 16 for diffusing image light L1.

By configuring the image display system 1 in this way, the image display board 10 has the ray angle control film 20 laminated on the screen 12, so that the ray angle of the observer P who sees the image displayed on the screen 12 can be determined. By controlling, it is possible to suppress a situation in which the image 100 is projected at an unintended position by the linear transmitted light from the screen 12.

Further, the image display system 1 has (Equation 1) between the incident angles α1 and α2 of the image light L1 on the screen 12 with respect to the horizontal plane (XY plane) and the maximum light transmittance angle β of the light beam angle control film 20. Since the above relationship is established, it becomes easy to visually recognize the rear view, and the observer P can visually recognize the image 100 of the character or the like displayed on the screen 12 as if it were floating in the air.

Further, the image display system 1 includes an incident angle α1 of the image light L1 on the screen 12 with respect to the horizontal plane (XY plane), a visible angle θ in the vertical direction of the ray angle control film 20, and the maximum light transmission of the ray angle control film 20. Since the relationship (Equation 2) is established with the rate angle β, it is possible to reduce the generation of linearly transmitted light and suppress the situation where the image 100 is projected to an unintended position by the linearly transmitted light. Can be done.

Further, the image display system 1 is configured such that the relationship (Equation 3) is established between the visible angle θ in the vertical direction of the light ray angle control film 20 and the maximum light transmittance angle β of the light ray angle control film 20. Therefore, it is possible to further suppress the situation where the image 100 is projected at an unintended position by the linear transmitted light from the screen 12.

Further, the light ray angle control film 20 constituting the image display system 1 is formed by joining the screen 12 with the screen 12 via the adhesive layer 28, so that the screen 12 and the light ray angle control film 20 and the adhesive layer 28 are refracted. Since the difference in rate is small, the refraction of light at each interface between the screen 12 and the ray angle control film 20 and the adhesive layer 28 can be reduced, and the generation of double images can be suppressed.

Further, the light ray angle control film 20 constituting the image display system 1 is formed by joining with the transparent substrate 18 via the adhesive layer 28, so that good adhesion to the light ray angle control film 20 can be obtained. At the same time, it is possible to reduce the refraction of light at each interface between the transparent substrate 18, the ray angle control film 20, and the adhesive layer 28, and it is possible to suppress the generation of a double image.

Further, since the screen 12 constituting the image display system 1 includes the hard coat layer 14 on the projection surface of the image light L1, the projection surface of the image light L1 on the screen 12 can be protected.

Further, the light beam angle control film 20 constituting the image display system 1 includes louver layers 22 in which light transmission bands 30 and light shielding bands 32 are alternately arranged, and the light shielding bands 32 are in the thickness direction of the louver layer 22 (X). (Direction) parallel to or tilted at a predetermined angle (see FIG. 4 (4A)). By configuring the image display system 1 in this way, it is possible to block the linearly transmitted light from the screen 12 and suppress the situation where the image 100 is projected at an unintended position by the linearly transmitted light. Further, according to the image display system 1, the visible angle θ of the light ray angle control film 20 is set to a desired angle range according to the purpose of use of the image display system 1 by adjusting the inclination angle of the shading band 32. be able to.

Further, the light beam angle control film 20 constituting the image display system 1 includes a louver layer 22 bonded to the screen 12 and a transparent protective layer 26 laminated on a surface opposite to the bonding surface of the louver layer 22 with the screen 12. , The louver layer 22 can be protected by the transparent protective layer 26.

Further, since the diffusion layer 16 of the screen 12 constituting the image display system 1 contains diamond particles 17, the image light L1 incident on the screen 12 can be diffused over a wide range.

Further, in the image display method using the image display system 1, the image light L1 projected from the image projection device 60 is made to enter light from the screen 12 side of the image display board 10, and the image light L1 emitted to the screen 12 is emitted. Is incident on the light ray angle control film 20, the light ray angle is controlled, and the image 100 is visually displayed to the observer P on the light ray angle control film 20 side. By displaying the image 100 using such a method, the image display board 10 has the light beam angle control film 20 laminated on the screen 12, so that the light beam of the observer P who sees the image displayed on the screen 12 By controlling the angle, it is possible to suppress a situation in which the image 100 is projected at an unintended position by the linear transmitted light from the screen 12.

(Other embodiments)
As described above, the preferred embodiments of the present invention have been described, but the present invention is not limited to these, and can be implemented in various modifications.

In the above-described embodiment, the image projection device 60 is provided on the back side and below the screen 12, but the arrangement of the image display device 60 is not limited to this.

FIG. 6 shows a diagram for explaining a modification 1 of the video display system according to the present embodiment.

The video display system 1a according to the first modification is different from the video display system 1 described above in that the video projection device 60 is provided on the back side and the lower side of the screen 12 (see FIG. 6). The video display system 1a configured in this way also has the same effects as the video display system 1 described above. In the video display system 1a according to the first modification, the arrangement of the video display board 10 is the same as that of the above-described embodiment, and therefore detailed description thereof will be omitted. Further, in the image display system 1a according to the first modification, the case member 40 is not particularly limited as long as the image projection device 60 and the image display board 10 can be arranged as described above.

Further, in the image display system 1a according to the first modification, α1 is calculated by regarding the lower side of the horizontal plane (XY plane) as the + direction and the upper side of the horizontal plane as the − direction in the vertical direction (Z direction) of FIG. , Α2, β, θ, θ1, θ2 and the like preferably satisfy the above-mentioned (Equation 1) to (Equation 3). By configuring the image display system 1a in this way, it is possible to suppress a situation in which the image 100a is projected at an unintended position by the linear transmitted light from the screen 12. In the video display system 1a configured to satisfy the above-mentioned (Equation 1) to (Equation 3), as shown in FIG. 6, the visual field range is widened mainly on the lower side of the horizontal plane, so that the observer P Is more suitable when looking up at the image display board 10 from slightly below.

Further, in the above-described embodiment, the video display board 10 is arranged parallel to the Z-axis direction, but the arrangement of the video display board 10 is not limited to this. For example, the image display board 10 may be arranged parallel to the X-axis direction. When the image display plate 10 is arranged parallel to the X-axis direction so that the light ray angle control film 20 is on the upper side, the image projection device 60 may be arranged below the image display plate 10, and the image display plate 10 may be arranged. It is preferably arranged below and on the right or left side of the center. In this case, the observer P may visually recognize the image 100 from above the image display board 10. Further, when the image display plate 10 is arranged parallel to the X-axis direction so that the light ray angle control film 20 is on the lower side, the image projection device 60 may be arranged above the image display plate 10 to display an image. It is preferably arranged above the plate 10 and on the right or left side of the center. In this case, the observer P may be configured to visually recognize the image 100 from below the image display board 10.

Further, for example, the image display board 10 may be arranged parallel to the Y-axis direction. In this case, the image display board 10 is preferably arranged so that the length direction of the light transmission band 30 and the light shielding band 32 of the louver layer 22 (the thickness direction of the louver layer 222) is parallel to the Z axis. In the video display systems 1 and 1a in which the video display board 10 is arranged in this way, the video projection device 60 is preferably arranged on the right side or the left side of the center of the video display board 10.

Further, the image display system 1 may include a reflective member on the back side and above the screen 12 of the image display board 10. In this case, the image projection device 60 is preferably placed at a position on the pedestal 42 where the image light L1 can be projected toward the reflecting member. The reflecting member is preferably a mirror that reflects the image light L1 projected from the image projection device 60 and projects the reflected image light L1 onto the screen 12. By configuring the image display system 1 in this way, the image projection device 60 and the screen 12 can be compactly housed in the case member 40, so that the image display system 1 can be miniaturized.

Further, in the above-described embodiment, the image display board 10 is configured by joining the transparent substrate 18 of the screen 12 and the ray angle control film 20 with the adhesive layer 28 interposed therebetween. Not limited.

FIG. 7 shows a partially enlarged cross-sectional view of the modified example 2 of the image display board of FIG. 3 (3A).

As shown in FIG. 7, the image display plate 10a included in the image display system 1b according to the second modification is configured by joining the diffusion layer 16 of the screen 12a and the ray angle control film 20 with the adhesive layer 28 interposed therebetween. It may have been done. In this case, the hard coat layer 14 of the screen 12a is a layer provided on the transparent substrate 18 which is the projection surface of the image light L1, and may be formed by applying a hard coating agent on the transparent substrate 18. ..

Further, in the video display systems 1, 1a and 1b (hereinafter, collectively referred to as "video display system 1 and the like"), the screens 12 and 12a do not have to include the hard coat layer 14.

Further, the image display plates 10 and 10a may further be provided with a hard coat layer on the surface of the transparent protective layer 26 of the light ray angle control film 20 opposite to the louver layer 22 (observer P side).

Further, in the above-described embodiment, the diffusion layer 16 contains diamond particles 17, but the present invention is not limited to this, and for example, metal-based inorganic particles may be contained. As the metal-based inorganic particles, metal oxides such as zirconium oxide, titanium oxide, zinc oxide, aluminum oxide, and cerium oxide, or particles other than metal oxides such as barium titanate and barium sulfate are preferably atomized. .. In particular, as the metal-based inorganic particles, those obtained by atomizing zirconium oxide, titanium oxide, cerium oxide, barium titanate and barium sulfate are more preferable. The diffusion layer 16 may contain only one kind of these metallic inorganic particles, or may contain two or more kinds of these metallic inorganic particles. Further, the diffusion layer 16 may contain diamond particles and metal-based inorganic particles.

Next, an embodiment of the present invention will be described in comparison with a comparative example. However, the present invention is not construed as being limited to the examples described below.

1. 1. Example (Example 1)
An image display board in which a screen and a ray angle control film are joined via an adhesive layer was manufactured. The screen is a member formed by laminating a diffusion layer containing diamond particles (refractive index 2.42) and a transparent substrate (refractive index 1.6) composed of polyethylene terephthalate (PET), and is used for image light. It is a member in which a hard coat layer is formed by applying a hard coat agent to the surface of a diffusion layer which is a projection surface. The ray angle control film is bonded by a louver layer, a transparent protective layer made of polycarbonate (refractive index 1.6), and an adhesive layer made of a silicone-based adhesive (refractive index 1.42). It is a member. The transparent substrate of the screen thus formed and the louver layer of the ray angle control film were joined via an adhesive layer (refractive index 1.42) composed of a silicone-based adhesive to manufacture an image display board. .. The light ray angle control film has a light-shielding band width W2 of the louver layer of 15 μm, a light transmission band width W1 of the louver layer of 150 μm, a louver layer thickness of 230 μm, a maximum light transmittance angle β of 25 °, and a visible angle θ. Was formed to be 100 °. The visible angle θ of the ray angle control film is an angle at which the opposite side can be seen through the film, and corresponds to the angle (θ2-θ1) shown in FIGS. 3 (3A) and 4 (4A). Image light was incident on the image display board manufactured in this manner, with the minimum incident angle α1 set to 20 ° and the maximum incident angle α2 set to 50 °. The minimum incident angle α1 is the smallest incident angle of the image light on the screen with respect to the horizontal plane (XY plane), and the maximum incident angle α2 is the largest incident angle of the image light with respect to the horizontal plane to the screen (FIG. 3). (3A)). In this case, all the above-mentioned relationships (Equation 1) to (Equation 3) are satisfied.
(Example 2)
Using the image display board formed under the same conditions as in Example 1, the image light was incident with the minimum incident angle α1 set to 30 ° and the maximum incident angle α2 set to 60 °. In this case, all the above-mentioned relationships (Equation 1) to (Equation 3) are satisfied.
(Example 3)
Using the image display board formed under the same conditions as in Example 1, the image light was incident with the minimum incident angle α1 set to 40 ° and the maximum incident angle α2 set to 70 °. In this case, all the above-mentioned relationships (Equation 1) to (Equation 3) are satisfied.
(Example 4)
Using the image display board formed under the same conditions as in Example 1, the image light was incident with the minimum incident angle α1 set to 50 ° and the maximum incident angle α2 set to 80 °. In this case, all the above-mentioned relationships (Equation 1) to (Equation 3) are satisfied.
(Example 5)
The image display board was manufactured under the same conditions as in Example 1 except that the light ray angle control film was formed so that the thickness of the louver layer was 260 μm, the maximum light transmittance angle β was 5 °, and the visible angle θ was 90 °. did. Using this image display board, image light was incident under the same conditions as in Example 2 (minimum incident angle α1 is 30 °, maximum incident angle α2 is 60 °). In this case, all the above-mentioned relationships (Equation 1) to (Equation 3) are satisfied.
(Example 6)
Using the image display board formed under the same conditions as in Example 5, the image light was incident under the same conditions as in Example 3 (minimum incident angle α1 is 40 °, maximum incident angle α2 is 70 °). In this case, all the above-mentioned relationships (Equation 1) to (Equation 3) are satisfied.
(Example 7)
Using the image display board formed under the same conditions as in Example 5, the image light was incident under the same conditions as in Example 4 (minimum incident angle α1 is 50 °, maximum incident angle α2 is 80 °). In this case, all the above-mentioned relationships (Equation 1) to (Equation 3) are satisfied.
(Example 8)
The image display board was manufactured under the same conditions as in Example 1 except that the light ray angle control film was formed so that the thickness of the louver layer was 290 μm, the maximum light transmittance angle β was 0 °, and the visible angle θ was 80 °. did. Using this image display board, image light was incident with a minimum incident angle α1 of 40 ° and a maximum incident angle α2 of 60 °. In this case, all the above-mentioned relationships (Equation 1) to (Equation 3) are satisfied.
(Example 9)
The image display board was manufactured under the same conditions as in Example 1 except that the light ray angle control film was formed so that the thickness of the louver layer was 210 μm, the maximum light transmittance angle β was 45 °, and the visible angle θ was 110 °. did. Using this image display board, image light was incident under the same conditions as in Example 2 (minimum incident angle α1 is 30 °, maximum incident angle α2 is 60 °). In this case, all the above-mentioned relationships (Equation 1) to (Equation 3) are satisfied.
(Example 10)
The image display board was manufactured under the same conditions as in Example 1 except that the light ray angle control film was formed so that the thickness of the louver layer was 190 μm, the maximum light transmittance angle β was 50 °, and the visible angle θ was 120 °. did. Using this image display board, image light was incident with a minimum incident angle α1 of 30 ° and a maximum incident angle α2 of 50 °. In this case, all the above-mentioned relationships (Equation 1) to (Equation 3) are satisfied.
(Example 11)
An image display board was manufactured under the same conditions as in Example 8 except that the ray angle control film was formed so that the visible angle θ was 50 °. Using this image display board, image light was incident under the same conditions as in Example 2 (minimum incident angle α1 is 30 °, maximum incident angle α2 is 60 °). In this case, all the above-mentioned relationships (Equation 1) to (Equation 3) are satisfied.

2. Comparative example (Comparative example 1)
Using the image display board formed under the same conditions as in Example 1, the image light was incident with the minimum incident angle α1 set to 10 ° and the maximum incident angle α2 set to 40 °. In this case, the above-mentioned relationship of (Equation 1) and (Equation 3) is satisfied, but the above-mentioned relationship of (Equation 2) is not satisfied.
(Comparative Example 2)
Using the image display board formed under the same conditions as in Example 1, the image light was incident with the minimum incident angle α1 set to 60 ° and the maximum incident angle α2 set to 80 °. In this case, the above-mentioned relationship (Equation 2) and (Equation 3) is satisfied, but the above-mentioned relationship (Equation 1) is not satisfied.
(Comparative Example 3)
Using the image display board formed under the same conditions as in Example 5, the image light was incident with the minimum incident angle α1 set to 20 ° and the maximum incident angle α2 set to 50 °. In this case, the above-mentioned relationship of (Equation 1) and (Equation 3) is satisfied, but the above-mentioned relationship of (Equation 2) is not satisfied.
(Comparative Example 4)
An image display board was manufactured under the same conditions as in Example 8 except that the ray angle control film was formed so that the visible angle θ was 80 °. Using this image display board, image light was incident under the same conditions as in Example 1 (minimum incident angle α1 is 20 °, maximum incident angle α2 is 50 °). In this case, the above-mentioned relationship (Equation 3) is satisfied, but the above-mentioned relationships (Equation 1) and (Equation 2) are not satisfied.
(Comparative Example 5)
An image display board was manufactured under the same conditions as in Example 5 except that the light ray angle control film was formed so that the maximum light transmittance angle β was 45 °. Using this image display board, image light was incident under the same conditions as in Example 5 (minimum incident angle α1 is 30 °, maximum incident angle α2 is 60 °). In this case, the above-mentioned relationship of (Equation 1) and (Equation 2) is satisfied, but the above-mentioned relationship of (Equation 3) is not satisfied.
(Comparative Example 6)
An image display board was manufactured under the same conditions as in Example 9 except that the light ray angle control film was formed so that the maximum light transmittance angle β was 55 °. Using this image display board, image light was incident under the same conditions as in Example 2 (minimum incident angle α1 is 30 °, maximum incident angle α2 is 60 °). In this case, the above-mentioned relationship (Equation 2) is satisfied, but the above-mentioned relationships (Equation 1) and (Equation 3) are not satisfied.
(Comparative Example 7)
An image display board was manufactured under the same conditions as in Example 1 except that the light ray angle control film was formed so that the maximum light transmittance angle β was −15 ° and the visible angle θ was 100 °. Using this image display board, image light was incident under the same conditions as in Example 2 (minimum incident angle α1 is 30 °, maximum incident angle α2 is 60 °). In this case, the above-mentioned relationship (Equation 3) is satisfied, but the above-mentioned relationships (Equation 1) and (Equation 2) are not satisfied.

3. 3. Evaluation method (1) Floating range of projected image due to background transmission Whether or not the rear landscape can be visually recognized, and whether or not the image (projected image) of a character or the like displayed on the screen can be visually recognized as floating in the air. I checked whether it was. The back landscape means a landscape that is visually recognized on the back surface of the projected image by the observer through the screen. The evaluation of the floating feeling range of the projected image by the background transmission was performed mainly by observing at a position of 0 ° to 30 ° with respect to the horizontal plane which is the viewing position. Further, the evaluation of the floating feeling range of the projected image by the background transmission depends on whether or not the above-mentioned relationships (Equation 1) and (Equation 3) are satisfied. If good transmittance is secured, the rear view is easy to see, and the projected image can be seen well as if it is floating in the air, it is evaluated as "◎" (meaning the best) and specified. If the transmittance of the louver is secured, the rear landscape can be visually recognized, and the projected image can be visually recognized as floating in the air, it is evaluated as "○" (meaning good), and the light-shielding characteristics of the louver layer are evaluated. If it is difficult to see the rear view and it is difficult to see the projected image as if it is floating in the air, it is evaluated as "△" (meaning defective) and the louver layer. Because of the low transmittance due to the light-shielding characteristics of, when it is very difficult to see the rear view and it is difficult to see the projected image floating in the air, "x" (meaning the worst) ).

(2) Stable visual recognition of the projected image over a wide range It was investigated whether or not a good projected image can be visually recognized over a wide range of the visible angle θ. The evaluation of stable visual recognition over a wide range of the projected image depends on whether or not the above-mentioned relationship (Equation 1) is satisfied and whether or not the value of β is 0. If a good projected image can be seen over a wider area, it is evaluated as "◎" (best meaning), and if a good projected image can be seen over a wider area, it is evaluated as "○" (good). (Meaning), if the range in which a good projected image can be visually recognized is narrow, it is evaluated as "△" (meaning defective), and if the projected image cannot be visually recognized, it is evaluated as "×" (meaning the worst). I evaluated it.

(3) Light leakage It was investigated whether or not the light was transmitted to an unnecessary position (unintended position) such as the ground or the ceiling due to the generation of the linear transmitted light. The evaluation of light leakage depends on whether or not the above-mentioned relationship (Equation 2) is satisfied. If light does not pass to unnecessary positions, or if there is a small amount of light transmission to unnecessary positions but it does not pose a problem in actual use, it is evaluated as "○" (meaning good). However, when the light was transmitted to an unnecessary position, it was evaluated as "x" (meaning defective).

(4) Comprehensive evaluation In consideration of the above-mentioned three evaluation items, "the floating feeling range of the projected image due to background transmission", "stable visual recognition of the projected image in a wide range", and "light leakage", the evaluation was made in three stages. If there is at least one defective or worst item among the three evaluation items, it is evaluated as "x" (meaning defective), and there is no defective or worst item among the three evaluation items and it is the best. When there are two or more items, it is evaluated as "◎" (meaning the best), and among the three evaluation items, there is no defective or worst item and the best item is one or less. In that case, it was evaluated as "○" (meaning good).

4. Evaluation Results Tables 1 to 3 show the manufacturing conditions and each evaluation result of each Example and each Comparative Example.

As is clear from Tables 1 to 3, when each Example and each Comparative Example are compared, Examples 1 to 11 satisfying all of the above-mentioned (Equation 1) to (Equation 3) are evaluation items (1) to (3). ) At least good evaluation was obtained in all cases. However, in Comparative Examples 1 to 7 in which at least one of the above-mentioned (Equation 1) to (Equation 3) is not satisfied, at least one of the evaluation items (1) to (3) is evaluated as defective or the worst. was gotten. In the comprehensive evaluation, Examples 1 to 7, 9 and 10 were evaluated as the best, Examples 8 and 11 were evaluated as good, and Comparative Examples 1 to 7 were evaluated as defective. From this result, the image display system is formed so as to satisfy all of the above-mentioned (Equation 1) to (Equation 3), so that the projected image is suspended in the air over a wide range of visible angles. Since it can be visually recognized by the observer and the generation of linearly transmitted light can be reduced, it is possible to suppress a situation in which the image 100a is projected at an unintended position by the linearly transmitted light from the screen 12.

The video display system according to the present invention can be used, for example, for digital signage for introducing products and advertising stores, and for displaying various videos such as movies, animations, live videos, and music promotion videos.

1,1a, 1b ... Video display system, 10,10a ... Video display board, 12,12a ... Screen, 14 ... Hard coat layer, 16 ... Diffusion layer, 17 ... Diamond Particles, 18 ... transparent substrate, 20 ... ray angle control film, 22 ... louver layer, 26 ... transparent protective layer, 28 ... adhesive layer, 30 ... light transmission band, 32. .. Shading band, 60 ... Image projection device, 100, 100a ... Image (projected image), L1, L2 ... Image light, P ... Observer.

Claims (11)

A screen that allows video light projected from one surface to enter and displays a video containing at least one of a moving image and a still image.
A ray angle control film that covers the entire surface of the screen opposite to the one surface and controls the ray angle viewed from the opposite surface.
A video display board made by stacking
An image projection device that is arranged at a position away from the one surface of the screen and projects the image light onto the screen.
It is a video display system equipped with
The screen is an image display system characterized in that a transparent substrate and a diffusion layer for diffusing the image light are laminated. The first aspect of claim 1, wherein the relationship of the following (Equation 1) is established between the angle of incidence of the image light on the screen with respect to the horizontal plane and the maximum light transmittance angle of the light ray angle control film. Video display system.
(Α1: Minimum incident angle of the image light on the image displayed on the screen, α2: Maximum incident angle of the image light on the image displayed on the screen, β: Maximum incident angle of the ray angle control film. Light transmittance angle.) The relationship of the following (Equation 2) between the angle of incidence of the image light on the screen with respect to the horizontal plane, the vertical visible angle of the ray angle control film, and the maximum ray transmission angle of the ray angle control film. The video display system according to claim 1 or 2, wherein
(Α1: Minimum incident angle of the image light on the image displayed on the screen, θ: visible angle in the vertical direction in the ray angle control film, β: maximum ray transmission angle of the ray angle control film.) Any of claims 1 to 3, wherein the relationship of the following (Equation 3) is established between the vertical viewing angle of the light ray angle control film and the maximum light transmittance angle of the light ray angle control film. The video display system according to item 1.
(Θ: vertical visible angle in the ray angle control film, β: maximum ray transmittance angle in the ray angle control film.) The image display system according to any one of claims 1 to 4, wherein the light ray angle control film is joined to the screen with an adhesive layer interposed therebetween. The image display system according to claim 5, wherein the light ray angle control film is joined to the transparent substrate with an adhesive layer interposed therebetween. The image display system according to any one of claims 1 to 6, wherein the screen is provided with a hard coat layer on a projection surface of the image light. The light ray angle control film includes louver layers in which light transmission bands and light-shielding bands are alternately arranged, and the light-shielding bands are parallel to the thickness direction of the louver layer or inclined at a predetermined angle. The video display system according to any one of claims 1 to 7, wherein the video display system is characterized by The ray angle control film is
With the louver layer joined to the screen,
A transparent protective layer laminated on the surface of the louver layer opposite to the joint surface with the screen,
The video display system according to claim 8, further comprising. The image display system according to any one of claims 1 to 9, wherein the diffusion layer contains diamond particles. A video display method using the video display system according to any one of claims 1 to 10.
The image light projected from the image projection device is made to enter light from the screen side of the image display board.
An image display method in which the image light received on the screen is incident on the ray angle control film, the ray angle is controlled, and the image is visually displayed to an observer on the ray angle control film side.