JP7192829B2 - Image display transparent member, image display system and image display method - Google Patents

Description

The present invention relates to an image display transparent member, an image display system and an image display method.

Display cases for products, etc.; windows of buildings, showrooms, vehicles, etc.; glass doors;
It is possible to visually recognize the scene that can be seen on the other side of the transparent member when viewed from the observer side, and when communicating information such as product descriptions, various equipment conditions, destination guidance, and communication items to the observer, On the other hand, when displaying the operation screen of various devices, or when making the scene beyond the transparent member invisible to the observer for privacy protection, security, etc., the image projected from the projector An image display transparent member (a so-called transparent screen) that visually displays light as an image to an observer.

The image display transparent member includes a reflective image display transparent member that displays the image light projected from the projector so that it can be visually recognized as an image by an observer on the same side as the projector; and the image light projected from the projector. There is a transmissive image display transparent member that visually displays the image as an image to an observer on the opposite side of the projector. However, conventional image display transparent members have low transparency (high haze) and poor visibility of scenes.

As a reflective image display transparent member, for example, as shown in FIG. array), a reflective film 133 formed along the uneven structure side surface of the first transparent layer 132 and transmitting part of the incident light, and a reflective film. An image display transparent member 101 having a second transparent layer 134 provided so as to cover the surface of the image display transparent member 101 has been proposed (see Patent Document 1).

In the reflective image display transparent member 101, as shown in FIG. 19, the image light L projected from the projector 200 and incident from the surface (first surface A) on the side of the second transparent substrate 120 is The light is scattered by the reflective film 133 to form an image, which is visually displayed as an image to the observer X who is on the same side as the projector 200 . The image display transparent member 101 has high transparency (low haze), high scene visibility, and high image screen gain.
Further, both the observer X on the same side as the projector 200 and the observer Y on the opposite side of the projector 200 can visually recognize the scene on the other side of the image display transparent member 101 as viewed from the observer side.

However, the reflective transparent image display member 101 has a problem in that the visibility of the scene on the other side of the image display transparent member 101 as seen from the observer is reduced. Specifically, the light of the sun or illumination incident on the image display transparent member 101 from the side of the observer trying to see the scene on the other side is scattered by the reflective film 133 , and the reflected and scattered light causes the image display transparent member 101 to move toward the other side of the image display transparent member 101 . The contrast of the light transmitted through the image display transparent member 101 is lowered, and the visibility of the scene on the other side of the image display transparent member 101 is lowered.
For example, when the reflective image display transparent member 101 is used for the window, the window appears white and blurred to the observer Y who is outside the window due to the reflected scattered light of the sunlight L1 scattered by the reflective film 133 during the day. , the visibility of the sight inside the window is reduced. In this case, at night, the window appears white and blurred to the observer X in the room due to the reflected scattered light L2 of the illumination light scattered by the reflecting film 133, and the visibility of the scene outside the window is reduced.

As a transmissive image display transparent member, for example, as shown in FIG. An image display transparent member 102 has been proposed that has a plurality of light scattering portions 143 that are arranged parallel to each other at predetermined intervals and extend along the surface direction (see Patent Document 2).

In the transmissive image display transparent member 102, as shown in FIG. 20, the image light L projected from the projector 200 and incident from the surface (first surface A) on the side of the first transparent substrate 110 is The light is scattered by the light scattering section 143 to form an image, which is visually displayed as an image to the observer Y who is on the opposite side of the projector 200 .
Further, both the observer X on the same side as the projector 200 and the observer Y on the opposite side of the projector 200 can visually recognize the scene on the other side of the image display transparent member 102 as viewed from the observer side.

However, in the transparent image display member 102 of the transmission type, as in the case of the transparent image display member 101 of the reflective type, there is a problem that the visibility of the scene on the other side of the transparent image display member 102 from the observer is reduced. be. Specifically, when the observer tries to see the scene on the far side, straight light coming from the scene on the far side is scattered when passing through the light scattering section 143, and the observer observes the scattered light. As a result, the resolution of the scene drops. For example, the visibility of characters and the like is greatly reduced. In addition, the light of the sun or illumination incident on the image display transparent member 102 from the side of the observer trying to see the scene on the other side is transmitted from the other side of the image display transparent member 102 by the reflected scattered light scattered by the light scattering section 143. The contrast of incoming light is reduced, and the visibility of the scene on the other side of the image display transparent member 102 is reduced. Therefore, for example, when the transmissive image display transparent member 102 is used for the window, the visibility of the scene inside the window from the observer Y who is outside the window decreases due to the reflected and scattered light from the sunlight L1 during the daytime. On the other hand, at night, the visibility of the scene outside the window is reduced for the observer X in the room due to the reflected scattered light of the illumination light L2.

Japanese Patent Publication No. 2010-539525 JP 2014-013369 A

The present invention provides an image display transparent member that enhances the resolution of the scene on the other side of the transparent member when viewed from an observer and has excellent visibility, and an image display system and an image display method using the same.

The present invention has the following configurations.
[1] It has a first surface and a second surface on the opposite side, and transmits the scene on the first surface side so as to be visible to the observer on the second surface side, and the second surface side The scene is transmitted so as to be visible to the observer on the first surface side, and the image light projected from the projector installed on the first surface side is visually recognized as an image by the observer on the second surface side. A transmissive image display transparent member capable of displaying
Between the first surface and the second surface,
An image display unit having a light scattering layer in which light scattering fine particles are dispersed throughout the transparent layer,
A first transparent base material is provided on the first surface side of the image display part, and a second transparent base material is provided on the second surface side of the image display part,
A transparent image display member, wherein at least a second transparent substrate of the transparent substrates is a light attenuation layer that attenuates part of light transmitted through the transparent image display member.
[2] The image display transparent member of [1], wherein the front haze of the image display transparent member is 4 to 40%.
[3] The image display transparent member of [1] or [2], wherein the light attenuation layer has polarization dependence.
[4] The image display transparent member according to any one of [1] to [3], wherein the light attenuation layer has a transmittance of 70% or less.
[5] The light attenuation layer is gray (uniform over the entire visible light range (0.25≤x≤0.4, 0.25≤y≤0.4 in the xyY color system)) [1 ] to [4].
[6] The image display transparent member according to any one of [1] to [4], wherein the light attenuation layer has a bluish tint (x≤0.33, y≤0.5 in the xyY color system).
[7] The image display transparent member according to any one of [1] to [4], wherein the light attenuation layer is greenish (y>x, 0.33≦y in the xyY color system).
[8] The image display transparent member of any one of [1] to [7], wherein the area of the light attenuation layer is the same as or larger than the area of the image display portion.
[9] The image display transparent member according to any one of [1] to [8], wherein the light-attenuating layer is made of glass or transparent resin containing a light-attenuating component.
[10] an image display transparent member according to any one of [1] to [9];
a projector installed on the first surface side of the image display transparent member;
A video display system with
[11] On the image display transparent member of any one of [1] to [9],
An image display method comprising projecting image light from a projector installed on a first surface side of an image display transparent member to display an image.

According to the image display transparent member, the image display system, and the image display method of the present invention, the resolution of the scene on the other side of the transparent member seen from the observer is improved, and the visibility is excellent.

1A and 1B are a schematic configuration diagram showing an example of an image display system of the present invention and a layer configuration diagram showing an example of a reflective image display transparent member of the present invention. FIG. FIG. 4 is a cross-sectional view showing an example of the manufacturing process of the reflective image display transparent member of the present invention. FIG. 4 is a layer configuration diagram showing another example of the reflective image display transparent member of the present invention. FIG. 4 is a layer configuration diagram showing another example of the reflective image display transparent member of the present invention. FIG. 4 is a layer configuration diagram showing another example of the reflective image display transparent member of the present invention. FIG. 4 is a layer configuration diagram showing another example of the reflective image display transparent member of the present invention. FIG. 4 is a layer configuration diagram showing another example of the reflective image display transparent member of the present invention. FIG. 4 is a layer configuration diagram showing another example of the reflective image display transparent member of the present invention. FIG. 4 is a layer configuration diagram showing another example of the reflective image display transparent member of the present invention. FIG. 3 is a schematic configuration diagram showing another example of the image display system of the present invention, and a layer configuration diagram showing an example of the transmissive image display transparent member of the present invention. 1A to 1D are cross-sectional views showing an example of a manufacturing process of a transmissive image display transparent member of the present invention; FIG. 3 is a layer configuration diagram showing another example of the transmissive image display transparent member of the present invention. FIG. 3 is a layer configuration diagram showing another example of the transmissive image display transparent member of the present invention. FIG. 3 is a layer configuration diagram showing another example of the transmissive image display transparent member of the present invention. FIG. 3 is a layer configuration diagram showing another example of the transmissive image display transparent member of the present invention. FIG. 3 is a layer configuration diagram showing another example of the transmissive image display transparent member of the present invention. FIG. 3 is a layer configuration diagram showing another example of the transmissive image display transparent member of the present invention. FIG. 3 is a layer configuration diagram showing another example of the transmissive image display transparent member of the present invention. 1 is a layer configuration diagram showing an example of a conventional reflective image display transparent member. FIG. 1 is a layer configuration diagram showing an example of a conventional transmissive image display transparent member. FIG.

The following term definitions apply throughout the specification and claims.
The “first surface” means the outermost surface of the image display transparent member, which is the surface on which the image light is projected from the projector.
"Second surface" means the outermost surface of the image display transparent member and the surface opposite to the first surface.
"Sight on the first surface side (second surface side)" refers to the view beyond the image display transparent member as seen from the observer on the second surface side (first surface side) of the image display transparent member. It means an image (main object (product, artwork, person, etc.) and its background, scenery, etc.) seen from the side. A scene does not include an image displayed by forming an image of image light projected from a projector on an image display transparent member.
"Forward haze" refers to transmitted light transmitted from the first surface side to the second surface side, or transmitted light transmitted from the second surface side to the first surface side, by forward scattering, incident light means the percentage of transmitted light that deviates from 0.044 rad (2.5°) or more. That is, it is a normal haze measured by the method described in JIS K 7136:2000 (ISO 14782:1999).
"Back haze" means the percentage of reflected light reflected at the first surface that deviates from specularly reflected light by 0.044 rad (2.5°) or more due to scattering.
The “concavo-convex structure” means a concavo-convex shape composed of a plurality of convex portions, a plurality of concave portions, or a plurality of convex portions and concave portions.
The “irregular uneven structure” means an uneven structure in which protrusions or recesses do not appear periodically and the sizes of the protrusions or recesses are irregular.
Arithmetic mean roughness (Ra) is arithmetic mean roughness measured based on JIS B 0601:2013 (ISO 4287:1997, Amd.1:2009). The reference length lr (cutoff value λc) for the roughness curve was 0.8 mm.
The transmittance is the ratio of the total amount of light transmitted and scattered in the forward direction to the incident light, expressed as a percentage.
The reflectance is a ratio of the total amount of light reflected and scattered in the backward direction to the incident light, expressed as a percentage.
The transmittance, reflectance and refractive index are values measured at room temperature using the d-line of a sodium lamp (wavelength 589 nm).

<Reflective image display transparent member>
A first aspect of the image display transparent member of the present invention has a first surface and a second surface on the opposite side thereof, and the scene on the first surface side is presented to the observer on the second surface side. visibly transmitted, the scene on the second surface side is visibly transmitted to the observer on the first surface side, and the image light projected from the first surface side is transmitted to the observer on the first surface side An image display transparent member for visually displaying an image as an image on a wall, wherein the image display transparent member is a reflective image display transparent member having a light attenuation layer that attenuates part of the light that passes through the image display transparent member. It is a member.

FIG. 1 is a layer configuration diagram showing an example of the reflective image display transparent member of the present invention.
In the image display transparent member 1, the image display portion 30 is arranged between the first transparent base material 10 and the second transparent base material 20, and the second transparent base material 20 is blended with the light attenuation component. It is a light attenuation layer that attenuates part of the light that passes through the image display transparent member 1 .
The first transparent substrate 10 and the image display section 30 are bonded together by the adhesive layer 12 , and the second transparent substrate 20 and the image display section 30 are bonded together by the adhesive layer 22 .

(First transparent substrate)
Materials for the first transparent substrate 10 include glass, transparent resin, and the like.
Glass constituting the transparent substrate includes soda lime glass, alkali-free glass, borosilicate glass, aluminosilicate glass, and the like. The first transparent substrate 10 made of glass may be subjected to chemical strengthening, physical strengthening, hard coating, or the like in order to improve durability.

Examples of the transparent resin that constitutes the first transparent substrate 10 include polycarbonate, polyester (polyethylene terephthalate, polyethylene naphthalate, etc.), triacetyl cellulose, cycloolefin polymer, polymethyl methacrylate, and the like. From the point of view, polycarbonate, polyester, and cycloolefin polymer are preferred.

As the first transparent substrate 10, one having no birefringence is preferable.
The thickness of the first transparent base material 10 may be any thickness as long as the durability as a base material is maintained. The thickness of the transparent substrate may be, for example, 0.01 mm or more, 0.05 mm or more, or 0.1 mm or more. Further, the thickness of the transparent substrate may be, for example, 10 mm or less, 5 mm or less, 0.5 mm or less, 0.3 mm or less, or 0.15 mm or less. you can

(Second transparent substrate (light attenuation layer))
The second transparent base material 20 is colored by blending a light attenuation component, and also serves as a light attenuation layer that attenuates part of the light transmitted through the image display transparent member 1 .
In the image display transparent member 1, since the second transparent base material 20 is a light attenuation layer, when the observer Y sees the scene on the other side of the image display transparent member 1, the visibility of the scene is improved. will be excellent.

Materials for the second transparent base material 20 include those obtained by blending a light attenuation component with the glass, transparent resin, or the like mentioned as the material for the first transparent base material 10 .
Examples of light attenuation components contained in glass include _{Fe2O3 , CoO , Ti2O} , _{V2O5 , CuO} , _Cr2O3 , NiO, _Er2O3 , _Nd2O3 , _CeO2 , Metal oxides such as MnO ₂ and SeO _x can be mentioned, and Fe and Cu are preferably contained from the viewpoint of imparting functions such as infrared cutoff.
Examples of light-attenuating components contained in the transparent resin include pigments such as carbon black and titanium black, and dyes such as azine-based compounds. Pigments are preferred from the viewpoint of weather resistance.

Also, the second transparent substrate 20 may have polarization dependence. For example, the polarization direction of most of the light contained in the image light L from the projector is aligned with the polarization direction of the side attenuated more by the second transparent substrate 20 . As a result, the image light L can be efficiently absorbed while having a high transmittance, and the visibility of the scene for the observer Y can be improved.
Dichroic dyes, metal nanorods, and the like are examples of light attenuation components having polarization dependence. Alternatively, the second transparent substrate having polarization dependence can be produced by stretching a transparent resin containing iodine, dye, silver, or the like. Alternatively, a wire grid structure may be formed on the surface of the second transparent substrate 20 to impart polarization dependence. As for the polarization dependence, it is preferable if the transmittance ratio is 2 or more, and more preferably 5 or more, because the difference from the light-attenuating material having no polarization dependence can be perceived as the brightness of the scene. , 10 or more.

The transmittance of the second transparent base material 20 of the light attenuation layer is preferably 3% or more, more preferably 5% or more, in terms of good visibility of the scene on the other side of the image display transparent member 1 when viewed from the observer Y. More preferably, 10% or more is even more preferable.
The transmittance of the second transparent base material 20 of the light attenuation layer is preferably 70% or less, and preferably 50% or less, because the contrast of the scene on the other side of the image display transparent member 1 when viewed from the observer Y is high. More preferably, 30% or less is even more preferable, and 10% or less is particularly preferable.
The haze of the second transparent substrate 20 of the light attenuation layer is preferably 10% or less, more preferably 5% or less, even more preferably 2% or less, and 1% or less in order to make it difficult for the light attenuation layer to form an image. is particularly preferred.

As for the color of the second transparent substrate 20 of the light attenuation layer, it is preferable to use gray, which uniformly attenuates light, so as to improve the contrast of the scene and the projected image. Preferred ranges are 0.25≤x≤0.4, 0.25≤y≤0.4, 0.27≤x≤0.38, 0.27≤y in the xyY color system. It is preferred that ≦0.38.

The color of the second transparent substrate 20 of the light attenuation layer is preferably tinged with bluish, because the visibility of the scene is improved. Preferred ranges are x≦0.33 and y≦0.5 in the xyY color system.

If the color of the second transparent base material 20 of the light attenuation layer is greenish, it is possible to secure the transmittance in the high luminosity area even when the privacy glass that reduces the amount of transmitted light is used. Therefore, by efficiently cutting visible light, infrared light, and ultraviolet light, it is possible to achieve both effectiveness and visibility. A preferable range is y>x and 0.33≦y in the xyY color system.

In the present invention, as shown in FIG. 1, the area of the second transparent base material 20, which is the light attenuation layer, is the same as the area of the image display section 30, or the area of the second transparent base material 20, which is the light attenuation layer, is It is preferably larger than the area of the image display section 30 . As a result, a part of the reflected and scattered light (sunlight or the like) incident from the observer Y side is stably absorbed by the light attenuation layer. Therefore, the deterioration of the contrast of the scene on the other side of the image display transparent member as seen from the observer Y is stably suppressed, and the excellent visibility of the scene on the other side of the image display transparent member 1 can be stably realized. Become.

The second transparent substrate 20 preferably has no birefringence.
The thickness of the second transparent base material 20 may be any thickness as long as the durability as a base material is maintained. The thickness of the transparent substrate may be, for example, 0.01 mm or more, 0.05 mm or more, or 0.1 mm or more. Further, the thickness of the transparent substrate may be, for example, 10 mm or less, 5 mm or less, 0.5 mm or less, 0.3 mm or less, or 0.15 mm or less. you can

(adhesion layer)
Materials for the adhesive layer 12 and the adhesive layer 22 (hereinafter collectively referred to as adhesive layers) include ethylene-vinyl acetate copolymer, polyvinyl butyral, adhesives (acrylic adhesives, etc.), and photocurable resin compositions. , thermoplastic resin compositions, and the like. The material of each adhesive layer may be the same or different.

The thermoplastic resin contained in the thermoplastic resin composition includes, for example, plasticized polyvinyl acetal, plasticized polyvinyl chloride, saturated polyester, plasticized saturated polyester, polyurethane, plasticized polyurethane, ethylene-vinyl acetate copolymer, ethylene - ethyl acrylate copolymer and the like.

The thickness of the adhesive layer may be any thickness that maintains the function of the adhesive layer, and is preferably 0.01 to 1.5 mm, more preferably 0.05 to 1 mm.

(Image display part)
The image display unit 30 includes a first transparent film 31; a first transparent layer 32 provided on the surface of the first transparent film 31 and having an irregular uneven structure on the surface; A reflective film 33 that transmits a part of the incident light, formed along the uneven structure side surface of the; A second transparent layer 34 provided to cover the surface of the reflective film 33; and a second transparent film 35 provided on the surface of the transparent layer 34 of the light scattering sheet.

(Transparent film)
The first transparent film 31 and the second transparent film 35 (hereinafter collectively referred to as transparent films) may be transparent resin films or thin glass films. The material of each transparent film may be the same or different.

Examples of the transparent resin that constitutes the transparent resin film include polycarbonate, polyester (polyethylene terephthalate, polyethylene naphthalate, etc.), triacetyl cellulose, cycloolefin polymer, polymethyl methacrylate, and the like.

The thickness of the transparent film is preferably a thickness to which a roll-to-roll process can be applied.

(transparent layer)
The first transparent layer 32 and the second transparent layer 34 (hereinafter collectively referred to as transparent layers) are preferably transparent resin layers. The material of each transparent layer may be the same or different, preferably the same.

As the transparent resin constituting the transparent resin layer, a cured product of a photocurable resin (acrylic resin, epoxy resin, etc.), a cured product of a thermosetting resin, and a thermoplastic resin are preferable. The yellow index of the transparent resin constituting the transparent resin layer is preferably 10 or less, more preferably 5 or less, from the viewpoint of maintaining transparency so as not to impair the function as a window in the image display transparent member.

The thickness of the transparent layer (excluding the portion where the concave-convex structure is formed) may be any thickness that can be easily formed by a roll-to-roll process, and is preferably 0.5 to 50 μm, for example.
The transmittance of the transparent layer is preferably 50 to 100%, more preferably 75 to 100%, even more preferably 90 to 100%.

The arithmetic mean roughness Ra of the irregular uneven structure formed on the surface of the first transparent layer 32 is preferably 0.01 to 20 μm, more preferably 0.05 to 10 μm. If the arithmetic mean roughness Ra is within this range, the viewing angle of the projected image is wide, the specularly reflected light can be visually recognized without looking directly, and graininess due to the uneven structure can be suppressed. If the arithmetic mean roughness Ra is 10 μm or less, the concave-convex structure does not interfere with viewing the scene on the other side of the image display transparent member 1, which is more preferable.

(reflective film)
The reflective film 33 may transmit part of the light incident on the reflective film 33 and reflect the other part. Examples of the reflective film 33 include a metal film, a semiconductor film, a dielectric single layer film, a dielectric multilayer film, a combination thereof, and the like.

Al, Ag, Ni, Cr, W, Si, and the like can be considered as metals constituting the metal film and the semiconductor film, and particularly, Al, Ag, or alloys containing them as main components are preferable.
Metal oxides, metal nitrides, and the like can be cited as dielectrics constituting the dielectric film.
The reflective film 33 preferably has a film configuration in which a metal thin film or an oxide film, a metal thin film, and an oxide film are laminated in this order.

The thickness of the reflective film 33 is preferably 1 to 100 nm from the viewpoint that the function of the irregular concave-convex structure formed on the surface of the first transparent layer 32 can be utilized without hindrance. 4 to 25 nm is more preferred.
For the same reason as the first transparent layer 32, the arithmetic mean roughness Ra of the irregular concave-convex structure of the reflective film 33 is preferably 0.01 to 20 μm, more preferably 0.05 to 10 μm.
The reflectance of the reflective film 33 is preferably 5% or more, more preferably 15% or more, and even more preferably 30% or more, as a range in which a sufficient screen gain can be obtained.

(Manufacturing method of video display unit)
An example of a method for manufacturing the image display section 30 will be described with reference to FIG.

As shown in FIG. 2A, a photocurable resin 36 is applied to the surface of a first transparent film 31, and a mold 61 having an irregular concave-convex structure formed on its surface is placed on the mold 61. The concave-convex structure is photocurable. It is overlaid on the photocurable resin 36 so as to be in contact with the resin 36 .

Light (ultraviolet rays, etc.) is irradiated from the side of the first transparent film 31 to cure the photocurable resin 36 to form the first transparent layer 32 having the irregular concave-convex structure of the mold 61 transferred to the surface. After that, the mold 61 is peeled off as shown in FIG. 2(b).

As shown in FIG. 2C, metal is physically vapor-deposited on the surface of the first transparent layer 32 to form a reflective film 33 made of a metal thin film.

As shown in FIG. 2(d), a photocurable resin 37 is applied to the surface of the reflective film 33, and a second transparent film 35 is placed on the photocurable resin 37. As shown in FIG.
By irradiating light (such as ultraviolet rays) from the first transparent film 31 side or the second transparent film 35 side to cure the photocurable resin 37 and form the second transparent layer 34, the image is formed. A display unit 30 is obtained.

Examples of the mold 61 include a resin film, a metal plate, and the like having an irregular concave-convex structure formed on the surface thereof. Examples of the resin film having an irregular concave-convex structure formed on its surface include a resin film containing fine particles, a sandblasted resin film, and the like.
Examples of the method of applying the photocurable resin include a die coating method, a blade coating method, a gravure coating method, a spin coating method, an inkjet method, and a spray coating method.
Examples of the physical vapor deposition method include a vacuum deposition method and a sputtering method.

(Optical Characteristics of Reflective Image Display Transparent Member)
The transmittance of the image display transparent member 1 is preferably 3% or more, more preferably 5% or more, more preferably 10%, in terms of good visibility of the scene seen on the other side of the image display transparent member 1 when viewed from the observer side. The above is more preferable.
The transmittance of the image display transparent member 1 is preferably 60% or less, more preferably 40% or less, still more preferably 30% or less, and particularly preferably 20% or less, from the viewpoint of appropriately maintaining the contrast of the projected image.

The front haze of the image display transparent member 1 is preferably 50% or less, more preferably 20% or less, and 10%, in terms of good visibility of the scene seen on the other side of the image display transparent member 1 when viewed from the observer side. More preferred are:

From the viewpoint of securing the screen gain, the rear haze of the image display transparent member 1 is preferably 5% or more when the image display transparent member 1 does not include a structure such as a flat mirror or a flat half mirror that increases the regular reflectance. , more preferably 10% or more, more preferably 15% or more.
The rear haze of the image display transparent member 1 is preferably 90% or less, more preferably 80% or less, from the viewpoint of the visibility of the scene seen on the other side of the image display transparent member 1 when viewed from the viewer's side.

The ratio of rear haze to front haze (rear haze/front haze) is preferably 0.5 or more, more preferably 1 or more. If the rear haze/front haze is 1 or more, even if there is an environment of 100 lux or more in the range where the line of sight of the observer looking at the image display transparent member 1 reaches, the other side of the image display transparent member 1 is seen from the observer side. The visibility of the scene seen on the side is good, and the projected image and the scene on the other side of the image display transparent member 1 can be seen. Such an image display transparent member 1 is suitable for use in an environment where outside light exists.

The refractive index difference between adjacent layers in the image display transparent member 1 is preferably 0.2 or less because the reflectance at each layer interface is suppressed to 0.5% or less, and the reflectance at each layer interface is 0.1. %, it is more preferably within 0.1.

(Image display system provided with reflective image display transparent member)
A first aspect of the image display system of the present invention is an image display system comprising the reflective transparent image display member of the present invention and a projector installed on the first surface side of the transparent image display member. .

FIG. 1 is a schematic configuration diagram showing an example of the image display system of the present invention.
The image display system includes a reflective image display transparent member 1 and a projector 200 installed on the first surface A side of the image display transparent member 1 .

The projector 200 may be any device as long as it can project the image light L onto the image display transparent member 1 . As the projector 200, a known projector or the like can be used.

(Image display method using reflective image display transparent member)
In a first aspect of the image display method of the present invention, image light is projected onto the reflective transparent image display member of the present invention from a projector installed on the first surface side of the image display transparent member to display an image. This is a video display method for displaying.

As shown in FIG. 1, the image light L projected from the projector 200 and incident from the surface (first surface A) of the image display transparent member 1 on the side of the first transparent substrate 10 (first surface A) is scattered by the reflection film 33. By doing so, an image is formed, and can be displayed as an image to the observer X who is on the same side as the projector 200 so that it can be visually recognized.
In addition, since the reflecting film 33 in the image display transparent member 1 partially transmits the incident light, the scene on the side of the first surface A can be visually recognized by the observer Y on the side of the second surface B, and The spectacle on the side of the second surface B can be transmitted so as to be visible to the observer X on the side of the first surface A.

(Mechanism of action)
In the above-described reflective transparent image display member 1 and the image display system and image display method using the same, for example, the image display transparent member 1 is used as a window so that the second surface B faces the outside of the room. In this case, the sunlight L1 incident on the image display transparent member 1 from the second surface B side is scattered by the reflective film 33, and part of the reflected and scattered light is reflected by the second transparent base material 20, which is the light attenuation layer. absorbed and reduced. As a result, when the observer Y sees the scene on the other side of the image display transparent member 1, the contrast of the light transmitted from the other side of the image display transparent member 1 is improved. Therefore, the contrast of the scene on the other side of the image display transparent member 1 seen from the observer Y is improved, and the visibility of the scene in the daytime is excellent.
In addition, the absorption of the reflected and scattered light by the second transparent base material 20, which is a light attenuation layer, suppresses the image display transparent member 1 from appearing white and blurred when viewed from the second surface B side. , excellent in design. Therefore, the image display transparent member 1 is useful for applications such as windows with the second surface B facing the outside.

Further, in the reflective transparent image display member 1 of this example, part of the light incident from the second surface B side of the image display transparent member 1 is absorbed by the second transparent base material 20 which is a light attenuation layer. Therefore, the contrast of the image by the image light projected from the projector 200 as seen from the observer X is improved, and the visibility is excellent.

(Other embodiments)
The reflective image display transparent member of the present invention has a first surface and a second surface on the opposite side, and the scene on the first surface side is presented to the observer on the second surface side. visibly transmitted, the scene on the second surface side is visibly transmitted to the observer on the first surface side, and the image light projected from the first surface side is transmitted to the observer on the first surface side An image display transparent member that can be visually recognized as an image in the image display transparent member, and the image display transparent member may have a light attenuation layer that attenuates part of the light that passes through the image display transparent member. The image display transparent member 1 is not limited to one. In the following description, the same components as those of the image display transparent member 1 shown in FIG.

The reflective transparent image display member of the present invention may be an image display transparent member 2 in which the first transparent base material 10 is omitted, as shown in FIG. As a specific example of the image display transparent member 2, for example, there is an example in which the second transparent base material 20 is an existing window glass or the like, that is, an example in which the image display section 30 is attached to an existing window glass or the like. .
Further, in double glazing having two glass plates and a frame-shaped spacer interposed in the peripheral portion of the glass plates so as to form a gap between the glass plates, one of the glass plates is a colored glass plate. Alternatively, the image display section 30 may be attached to the inner surface of one of the glass plates.

As shown in FIG. 4, the reflective image display transparent member of the present invention is colored by blending a light attenuation component instead of the first transparent base material 10, and part of the light transmitted through the transparent member is An image having a first transparent substrate 10A that serves as a light attenuation layer to attenuate, and a second transparent substrate 20A that is not colored without being blended with a light attenuation component instead of the second transparent substrate 20. It may be the display transparent member 1A.
As the first transparent base material 10A mixed with the light attenuation component and colored, the same material as the second transparent base material 20 of the image display transparent member 1 can be used. As the second transparent base material 20A which is not mixed with the light attenuation component and is not colored, the same material as the first transparent base material 10 of the image display transparent member 1 can be used.

In the image display transparent member 1A, for example, when the image display transparent member 1A is used as a window so that the second surface B faces the outside of the room, illumination light L2 incident on the image display transparent member 1A from the first surface A side is emitted. Part of the reflected scattered light scattered by the reflective film 33 is absorbed by the first transparent substrate 10A, which is the light attenuation layer, and is reduced. As a result, when an observer on the side of the first surface A sees the scene on the other side of the image display transparent member 1A, the contrast of the light transmitted from the other side of the image display transparent member 1A is improved. Therefore, the contrast of the scene on the other side of the image display transparent member 1A seen from the observer on the side of the first surface A is improved, and the visibility of the scene at night is excellent.
Further, in this example, part of the reflected and scattered light obtained by scattering the image light projected from the projector 200 (not shown) on the first surface A side by the reflecting film 33 is the light attenuation layer of the first transparent base material. Due to the absorption by 10A, the gain of the image is lowered compared to the case where there is no light attenuation layer, but this can be dealt with by increasing the amount of image light from the projector 200 .
In addition, when a light-attenuating material having polarization dependence is used, it is possible to improve the visibility of the scene while suppressing the decrease in gain by aligning the polarization direction of the transmitted light with the projection light L (not shown). It is possible and preferable.

As shown in FIG. 5, the reflective image display transparent member of the present invention has a first transparent base material 10 and a second transparent base material 20A which are not colored without being blended with a light attenuation component. A light attenuation layer 50 is arranged on the surface of the second transparent base material 20A opposite to the image display section 30. The light attenuation layer 50 is colored by blending a light attenuation component, and attenuates part of the light transmitted through the transparent member. It may be the image display transparent member 3 that has been formed. The second transparent base material 20A and the light attenuation layer 50 are adhered by an adhesive layer 52. As shown in FIG.

The light-attenuating layer 50 may be, for example, a colored transparent film containing a light-attenuating component. The colored transparent film may be a colored transparent resin film colored by blending a light attenuating component, or a thin colored glass film colored by blending a light attenuating component, and a thin film having a large light absorption coefficient. It can be material.
Examples of the transparent resin of the colored transparent resin film forming the light attenuation layer 50 include polycarbonate, polyester (polyethylene terephthalate, polyethylene naphthalate, etc.), cycloolefin polymer, polymethyl methacrylate, and the like.
Examples of light-attenuating components in the light-attenuating layer 50 include pigments such as carbon black and titanium black, and dyes such as azine-based compounds. Pigments are preferable from the viewpoint of weather resistance.
Examples of thin film materials having a large absorption coefficient for the light attenuation layer 50 include oxides such as Cr, Mo, W, Fe, Al, and Si, and carbon-based materials such as graphene and DLC.
When imparting polarization dependence to the light attenuation layer 50, dichroic dyes, nanorods of metals, etc., stretched iodine, Ag, etc., and oblique vapor deposition of absorption thin films can be used.

The transmittance of the light attenuation layer 50 is preferably 3% or more, more preferably 5% or more, and more preferably 10% or more in terms of good visibility of the scene on the other side of the image display transparent member 1 when viewed from the observer Y. More preferred.
The transmittance of the light attenuation layer 50 is preferably 70% or less, more preferably 50% or less, and 30% or less, in order to increase the contrast of the scene on the other side of the image display transparent member 1 when viewed from the observer Y. More preferably, 10% or less is particularly preferable.
The haze of the light attenuation layer 50 is preferably 10% or less, more preferably 5% or less, even more preferably 2% or less, and particularly preferably 1% or less, from the viewpoint of making it difficult for the light attenuation layer to form an image.
The adhesive layer 52 may be the same as the adhesive layer 12 and the adhesive layer 22 .

In the image display transparent member 3, for the same reason as in the image display transparent member 1, the contrast of the scene on the other side of the image display transparent member 3 seen from the observer on the side of the second surface B is improved, and the scene is visually recognized. Excellent in nature. In addition, the visibility of the image by the image light projected from the projector 200 (not shown) on the first surface A side when viewed from the observer on the first surface A side is excellent.

The reflective image display transparent member of the present invention, as shown in FIG. An image display transparent member 4A having a light attenuation layer 50 disposed on the surface thereof may be used. In the image display transparent member 4A, for the same reason as in the image display transparent member 1, the contrast of the scene on the other side of the image display transparent member 4A seen from the observer on the side of the second surface B is improved, and the scene is visually recognized. Excellent in nature. In addition, the visibility of the image by the image light projected from the projector 200 (not shown) on the first surface A side when viewed from the observer on the first surface A side is excellent.
Further, as shown in FIG. 7, the first transparent base material 10 and the second transparent base material 20 are omitted, and the light attenuation layer 50 is arranged on the surface of the first transparent film 31 of the image display section 30. It may be the display transparent member 4B. In the image display transparent member 4B, for the same reason as in the image display transparent member 1A, the contrast of the scene on the other side of the image display transparent member 4B seen from the observer on the side of the first surface A is improved, and the scene is visually recognized. Excellent in nature.

The image display transparent members 4A and 4B can be attached to an existing window glass or the like using an adhesive layer. Also, the image display transparent members 4A and 4B can be deformed, and are suitable for forming an image display transparent member having a curved surface.
Moreover, in the image display transparent members 4A and 4B of FIGS. 6 and 7, the first transparent film 31 and the second transparent film 35 may be replaced with transparent substrates to have an image display portion.

As shown in FIG. 8, the reflective image display transparent member of the present invention has a first transparent base material 10A and a second transparent base material 20 both of which are colored by blending light attenuation components. It may be the transparent member 1B.
In the image display transparent member 1B, for the same reason as in the image display transparent member 1, the contrast of the scene on the other side of the image display transparent member 1B viewed from the observer on the side of the second surface B is improved, and the scene is visually recognized. Excellent in nature. In addition, the visibility of the image by the image light projected from the projector 200 (not shown) on the first surface A side when viewed from the observer on the first surface A side is excellent. Also, for the same reason as the image display transparent member 1A, the contrast of the scene on the other side of the image display transparent member 1B seen from the observer on the first surface A side is improved, and the visibility of the scene is excellent.

As shown in FIG. 9, the reflective image display transparent member of the present invention has a first transparent base material 10 and a second transparent base material 20A which are not colored with no light attenuation component blended therein. A transparent image display member 1C having an image display portion 30A which is colored by blending a light attenuation component in a second transparent film 35A and which serves as a light attenuation layer for attenuating part of the light transmitted through the transparent member. may
In the image display transparent member 1C, for the same reason as in the image display transparent member 1, the contrast of the scene on the other side of the image display transparent member 1C seen from the observer on the side of the second surface B is improved, and the scene is visually recognized. Excellent in nature. In addition, the visibility of the image by the image light projected from the projector 200 (not shown) on the first surface A side when viewed from the observer on the first surface A side is excellent.

In the image display transparent member 1C, instead of the second transparent film 35A, the first transparent film 31 is mixed with a light attenuation component to be colored, thereby attenuating part of the light transmitted through the transparent member. It may be a layered image display transparent member. In addition, both the first transparent film 31 and the second transparent film 35 are colored by blending a light attenuation component to form a light attenuation layer that attenuates part of the light transmitted through the transparent member. It may be a member.
Further, the reflective transparent image display member of the present invention has a second transparent base material 20A in which no light attenuation component is blended, instead of the second transparent base material 20 in the image display transparent member 1. An image display transparent member that is colored by blending a light attenuation component into one or both of the adhesive layer 12 and the adhesive layer 22, and serving as a light attenuation layer that attenuates part of the light that passes through the transparent member. may
Examples of the light-attenuating component to be blended in the transparent film or the adhesive layer of the image display portion include the same ones as those mentioned for the light-attenuating layer 50 .

As for the function of the member serving as the light attenuation layer, it is sufficient that it has the function of reducing the transmittance, so a half mirror may be used as the light attenuation layer.
The reflectance of the half mirror may be 5% or more, preferably 10% or more, and may be 25% or more in some cases.
By arranging the half mirror between the image display section and the projector, in addition to the above effects, it is possible to project on both sides. Also, by arranging it in a part that is not between the image display unit and the projector, it is possible to add a function as a magic mirror, so that it is possible to make it difficult for the observer to recognize the lack of images to the rear. Become.
As described above, the embodiment of the light attenuation layer in the reflective image display transparent member of the present invention includes the second transparent substrate 20 in FIGS. 1 and 3, the first transparent substrate 10A in FIG. 7, the first transparent substrate 10A and the second transparent substrate 20 in FIG. 8, transparent substrates and transparent films, and half mirrors.

In the reflective image display transparent member of the present invention, the image light from the projector may be projected onto the second transparent substrate side. In this case, an antireflection film is provided on the surface of the second transparent substrate, or an antireflection structure is formed directly on the surface of the second transparent substrate.
Further, the image display unit 30 may be arranged so that the second transparent film 35 of the image display unit 30 faces the projector 200 side.

If the light-scattering sheet of the image display portion can maintain its shape without the transparent film, the light-scattering sheet does not necessarily need to be provided with the transparent film.

In the reflective image display transparent member of the present invention, the uneven structure on the surface of the first transparent layer may be a regular uneven structure (such as a microlens array). However, for the following reasons, the uneven structure on the surface of the first transparent layer is preferably an irregular uneven structure.
When a reflective film is formed on the surface of a regular concave-convex structure (such as a microlens array), light diffraction causes color unevenness in the scene seen on the other side of the image display transparent member when viewed from the observer side. When viewed from the observer's side, the edge portion of the scene seen on the other side of the image display transparent member appears rainbow-colored, impairing visibility. On the other hand, when a reflective film is formed on a surface having an irregular concave-convex structure, diffraction and dispersion of light are less likely to occur, and these problems are less likely to occur. Therefore, it is possible to suppress the phenomenon that the color changes depending on the viewing direction and place of the image display transparent member and the direction of the incident light, and the spectroscopy of the scene seen on the other side of the image display transparent member is suppressed. As a result, the visibility of the scene seen on the other side of the image display transparent member is excellent, and the property of a transparent screen that does not obstruct the line of sight can be provided.

In addition, other examples of the uneven structure with a reflective film and those after embedding the unevenness include a half mirror laminated with a scattering material; a volume hologram that reflects, deflects, and diffuses; Other items that polarize, reflect, and diffuse due to the uneven surface or the structure of forming a reflective film on the surface; The surface of cholesteric liquid crystal is roughened by etching, etc., the liquid crystal layer of cholesteric liquid crystal is formed on horizontally aligned and vertically aligned substrates, and the substrate is coated with cholesteric liquid crystal added with a surfactant. Then, the coating surface is vertically distributed, or the orientation of the coating surface is reduced).
Further, if the first transparent substrate 10 can sufficiently reflect and scatter light with only the concave-convex structure without the reflective film, the reflective film is not necessarily required.

<Transmissive image display transparent member>
A second aspect of the image display transparent member of the present invention has a first surface and a second surface opposite to the first surface, and presents a scene on the first surface side to an observer on the second surface side. visibly transmitted, the scene on the second surface side is visibly transmitted to the observer on the first surface side, and the image light projected from the first surface side is transmitted to the observer on the second surface side a transmissive image display transparent member for displaying a visible image as an image in the image display transparent member, wherein the image display transparent member has a light attenuation layer that attenuates part of the light transmitted through the image display transparent member It is a member.

FIG. 10 is a layer configuration diagram showing an example of the transmissive image display transparent member of the present invention. In the following description, the same components as those of the image display transparent member 1 shown in FIG.
In the image display transparent member 5, the image display portion 40 is arranged between the first transparent base material 10 and the second transparent base material 20, and the second transparent base material 20 is blended with a light attenuation component. It is a light attenuation layer that attenuates part of the light that passes through the image display transparent member 1 .
The first transparent substrate 10 and the image display section 40 are bonded together by the adhesive layer 12 , and the second transparent substrate 20 and the image display section 40 are bonded together by the adhesive layer 22 .
In the image display transparent member 5, since the second transparent base material 20 is a light attenuation layer, when the observer Y sees the scene on the other side of the image display transparent member 5, the visibility of the scene is improved. will be excellent.

(Image display part)
The image display unit 40 includes a first transparent film 41; a transparent layer 42 provided on the surface of the first transparent film 41; A light-scattering sheet having a plurality of light-scattering portions 43 extending along the surface direction and having a right-angled triangular cross-section in a direction orthogonal to the longitudinal direction; and a second transparent film 45 provided on the surface of the transparent layer 42. . Hereinafter, such a structure in which a plurality of light scattering portions 43 extending in one-dimensional direction in stripes is formed may be referred to as a louver structure.

(Transparent film)
The first transparent film 41 and the second transparent film 45 (hereinafter collectively referred to as transparent films) may be transparent resin films or thin glass films. The material of each transparent film may be the same or different.
As the transparent film, the same transparent film as that of the image display section 30 described above may be used.

(transparent layer)
The transparent layer 42 is preferably a transparent resin layer.
As the transparent resin forming the transparent resin layer, the same transparent resin as that forming the transparent resin layer of the image display section 30 may be used.

The thickness of the transparent layer 42 is preferably 10-200 μm. If the thickness of the transparent layer 42 is 10 μm or more, the distance between the light scattering portions 43 is also 10 μm or more, and the effect of the louver structure is fully exhibited. If the thickness of the transparent layer 42 is 200 μm or less, it is easy to form the transparent layer 42 by a roll-to-roll process.

(light scattering part)
The light scattering portion 43 contains, for example, a transparent resin, a light scattering material, and a light attenuating material as necessary.

Examples of the transparent resin contained in the light scattering portion 43 include a cured product of photocurable resin (acrylic resin, epoxy resin, etc.), a cured product of thermosetting resin, and a thermoplastic resin. The transparent resin contained in the light scattering portion 43 may be the same as or different from the transparent resin forming the transparent layer 42 .

Fine particles of high refractive index materials such as titanium oxide (refractive index: 2.5 to 2.7), zirconium oxide (refractive index: 2.4), and aluminum oxide (refractive index: 1.76) are used as light scattering materials. fine particles of low refractive index materials such as porous silica (refractive index: 1.3 or less) and hollow silica (refractive index: 1.3 or less); resin materials with low compatibility with the transparent resin and different refractive indexes; crystals and a resin material having a thickness of 1 μm or less.

The concentration of the light scattering material is preferably 0.01-5% by volume, more preferably 0.05-1% by volume.
When the light scattering material is fine particles, the average particle size of the fine particles is preferably 0.05 to 1 μm, more preferably 0.15 to 0.8 μm. When the average particle diameter of the fine particles is approximately the same as or slightly smaller than the wavelength of the scattered light, the probability of forward scattering increases, and the function of scattering incident light without refracting it becomes stronger. As a result, the distortion of the scene seen on the other side of the image display transparent member 5 when viewed from the observer side is suppressed, and the light amount is not changed abruptly, thereby improving the visibility of the scene.

When the light scattering portion 43 contains a light attenuation material, it is possible to attenuate part of the light propagating as unnecessary stray light in the image display transparent member 5, thereby reducing the amount of scattered light. Therefore, the phenomenon that the image display transparent member 5 looks cloudy is suppressed, the contrast of the image is improved, and the visibility of the image is improved. In addition, the contrast of the scene seen on the other side of the image display transparent member 5 seen from the observer side is improved, and the visibility of the scene is also improved. In particular, when an environment of 100 lux or more exists in the line of sight of the observer due to external light, the above effect is easily obtained.
Light-attenuating materials include carbon black, titanium black, and the like.
The concentration of the light-attenuating material is preferably 0.01-10% by volume, more preferably 0.1-3% by volume.

The interval between the light scattering portions 43 (the center-to-center distance between adjacent light scattering portions 43) is preferably 10 to 250 μm, more preferably 10 to 100 μm. If the distance between the light scattering portions 43 is 10 μm or more, the light scattering portions 43 are easily formed. If the interval between the light scattering portions 43 is 250 μm or less, the light scattering portions 43 are difficult to visually recognize.

The width of the light scattering portion 43 (direction perpendicular to the plane direction of the image display portion 40 and the longitudinal direction of the light scattering portion 43) is preferably 10 to 70%, more preferably 25 to 50%, of the interval of the light scattering portion 43. . If the width of the light scattering portions 43 is 10% or more of the interval between the light scattering portions 43, the light scattering portions 43 are easily formed. If the width of the light scattering portion 43 is 70% or less of the interval between the light scattering portions 43, the transmittance of the light scattering portion 43 and the visibility of the scene seen on the other side of the image display transparent member 5 when viewed from the observer side improves.

The ratio of the height of the light scattering portion 43 to the width of the light scattering portion 43 (in the direction perpendicular to the surface direction of the image display portion 40), that is, the aspect ratio is the oblique incident projection while maintaining the transmittance of the straight light of the scene. It is preferably 1 or more, more preferably 1.5 or more, and even more preferably 2 or more, because the image light from the machine is scattered at a high gain.

(Manufacturing method of video display unit)
An example of a method for manufacturing the image display section 40 will be described with reference to FIG.

As shown in FIG. 11( a ), a photocurable resin 46 is applied to the surface of the first transparent film 41 , and a plurality of ridges having a right-angled triangular cross section corresponding to the light scattering portions 43 are formed on the surface. The mold 62 is overlaid on the photocurable resin 46 so that the ridges are in contact with the photocurable resin 46 .

Light (ultraviolet rays, etc.) is irradiated from the side of the first transparent film 41 to cure the photocurable resin 46, thereby forming the lower transparent layer 42a having grooves 44 corresponding to the ridges of the mold 62 formed on the surface. After that, the mold 62 is peeled off as shown in FIG. 11(b).

As shown in FIG. 11(c), a paste containing a photocurable resin, a light-scattering material, and, if necessary, a light-attenuating material is supplied to the surface of the lower transparent layer 42a, and the excess is scraped off with a doctor blade. By doing so, the paste 48 is embedded in the grooves 44 of the transparent layer lower layer 42a. Light (ultraviolet rays or the like) is applied to harden the paste 48 to form the light scattering portion 43 .

As shown in FIG. 11D, a photocurable resin 47 is applied to the surface of the lower transparent layer 42a and the surface of the light scattering portion 43, and the second transparent film 45 is placed on the photocurable resin 47. As shown in FIG.
Light (ultraviolet rays, etc.) is irradiated from the first transparent film 41 side or the second transparent film 45 side to cure the photocurable resin 47 to form a transparent upper layer, thereby forming the image display section 40. get

Examples of the mold 62 include a resin film, a metal plate, and the like having a plurality of protrusions formed on the surface thereof.
Examples of the method of applying the photocurable resin include a die coating method, a blade coating method, a gravure coating method, a spin coating method, an inkjet method, and a spray coating method.

(Optical characteristics of transmissive image display transparent member)
The transmittance of the image display transparent member 5 is preferably 1% or more, more preferably 5% or more, in terms of good visibility of the scene seen on the other side of the image display transparent member 5 when viewed from the observer side.

The front haze of the image display transparent member 5 is preferably 4% or more, more preferably 5% or more, and even more preferably 8% or more, from the viewpoint of securing screen gain and viewing angle.
The front haze of the image display transparent member 5 is preferably 40% or less, more preferably 30% or less, and 20% or less from the viewpoint of the visibility of the scene seen on the other side of the image display transparent member 5 when viewed from the observer side. is more preferred.

The difference between the refractive index of the transparent layer 42 and the refractive index of the light scattering portion 43 in the image display transparent member 5 is preferably 0.01 or less, more preferably 0.005 or less, and even more preferably 0.001 or less. If the difference between the refractive index of the transparent layer 42 and the refractive index of the light scattering portion 43 is large, the scene seen on the other side of the image display transparent member 5 appears multiple when viewed from the observer side. From the viewpoint of suppressing rainbow unevenness and spectroscopy of a scene, it is preferable that the transparent layer 42 and the light scattering portion 43 have the same refractive index.

It is also preferable that the difference between the refractive index of the transparent film in the image display transparent member 5 and the refractive index of the transparent layer 42 is as small as possible. The difference between the refractive index of the transparent film and the transparent layer 42 is preferably 0.1 or less, more preferably 0.05 or less, still more preferably 0.01 or less, and particularly preferably 0.001 or less.

(Image display system provided with transmissive image display transparent member)
A second aspect of the image display system of the present invention is an image display system comprising the transmissive image display transparent member of the present invention and a projector installed on the first surface side of the image display transparent member. .

FIG. 10 is a schematic configuration diagram showing another example of the image display system of the present invention.
The image display system includes a transmissive image display transparent member 5 and a projector 200 installed on the first surface A side of the image display transparent member 5 .

The projector 200 may be any device as long as it can project the image light L onto the image display transparent member 5 . As the projector 200, a known projector or the like can be used.

(Image display method using transmissive image display transparent member)
In a second aspect of the image display method of the present invention, image light is projected onto the transmissive image display transparent member of the present invention from a projector installed on the first surface side of the image display transparent member to display an image. This is a video display method for displaying.

As shown in FIG. 10, the image light L projected from the projector 200 and incident from the surface (first surface A) of the image display transparent member 5 on the side of the first transparent substrate 10 is scattered in the light scattering portion 43. An image is formed by being scattered, and displayed as an image to an observer Y on the opposite side of the projector 200 so as to be visually recognizable.
In addition, since the gaps between the light scattering portions 43 in the image display transparent member 5 transmit light, the scene on the first surface A side can be visibly transmitted to the observer Y on the second surface B side, and The spectacle on the surface B side of the second surface can be visibly transmitted to the observer X on the first surface A side.

(Mechanism of action)
In the transmission type transparent image display member 5 and the image display system and image display method using the same described above, for example, the image display transparent member 5 is used as a window so that the second surface B faces the outside of the room. In this case, part of the scattered light obtained by scattering the straight light from the scene (indoor) incident on the image display transparent member 5 from the first surface A side by the light scattering section 43 is the second transparent substrate which is the light attenuation layer. It is absorbed by the material 20 and reduced. As a result, when the observer Y sees the scene on the other side of the image display transparent member 5, the resolution of the light transmitted from the other side of the image display transparent member 5 is improved. Therefore, the visibility of the scene is excellent. In addition, the sunlight L1 incident on the image display transparent member 5 from the second surface B side is scattered by the light scattering portion 43, and part of the reflected scattered light is transferred to the second transparent base material 20, which is the light attenuation layer. is absorbed by and decreases. As a result, when an observer on the A side of the first surface sees the scene (outdoor) on the other side of the image display transparent member 5, the contrast of the light transmitted from the other side of the image display transparent member 5 is improved. Therefore, the contrast of the scene on the other side of the image display transparent member 5 seen from the observer Y is improved, and the visibility of the scene in the daytime is excellent.
Further, in this example, a part of the transmitted and scattered light scattered by the light scattering section 43 of the image light projected from the projector 200 is attenuated by the second transparent substrate 20, which is the light attenuation layer. The image gain is lower than when there is no layer, but this can be dealt with by increasing the amount of image light from the projector 200 .
When a material having polarization dependence is used for the second transparent base material 20, by aligning the direction of high transmittance of the material having polarization dependence in the same direction as the main polarization direction of the projection light L, the image light can be transmitted. The visibility of the observer Y can be improved by increasing the transmittance of the scene on the far side while suppressing the decrease in the gain.

(Other embodiments)
The transmissive image display transparent member of the present invention has a first surface and a second surface on the opposite side, and the scene on the first surface side is presented to the observer on the second surface side. visibly transmitted, the scene on the second surface side is visibly transmitted to the observer on the first surface side, and the image light projected from the first surface side is transmitted to the observer on the second surface side An image display transparent member that can be visually recognized as an image in the image display transparent member, and the image display transparent member may have a light attenuation layer that attenuates part of the light that passes through the image display transparent member. The ten image display transparent members 5 are not limited. 10 are given the same reference numerals, and the description thereof will be omitted.

The transmissive image display transparent member of the present invention may be an image display transparent member 6 in which the first transparent base material 10 is omitted, as shown in FIG. As a specific example of the image display transparent member 6, for example, there is an example in which the second transparent base material 20 is an existing window glass or the like, that is, an example in which the image display section 40 is attached to an existing window glass or the like. .
Further, in double glazing having two glass plates and a frame-shaped spacer interposed in the peripheral portion of the glass plates so as to form a gap between the glass plates, one of the glass plates is a colored glass plate. Alternatively, the image display section 40 may be attached to the inner surface of one of the glass plates.

As shown in FIG. 13, the transmissive image display transparent member of the present invention is colored by blending a light attenuation component instead of the first transparent base material 10, and part of the light transmitted through the transparent member is An image having a first transparent substrate 10A that serves as a light attenuation layer to attenuate, and a second transparent substrate 20A that is not colored without being blended with a light attenuation component instead of the second transparent substrate 20. It may be the display transparent member 5A.
In the image display transparent member 5A, for example, when the image display transparent member 5A is used as a window so that the second surface B faces the outdoors, a scene (outdoor) incident on the image display transparent member 5A from the second surface B side A part of the scattered light scattered by the light scattering portion 43 is absorbed by the second transparent substrate 20, which is the light attenuation layer, and is reduced. As a result, when the observer Y sees the scene on the other side of the image display transparent member 5A, the resolution of the light transmitted from the other side of the image display transparent member 5A is improved. Therefore, the visibility of the scene is excellent. Further, part of the reflected scattered light obtained by scattering the illumination light L2 incident on the image display transparent member 5A from the first surface A side by the light scattering portion 43 is reflected by the first transparent base material 10A, which is the light attenuation layer. Attenuated and reduced. As a result, when an observer on the side of the first surface A sees the scene (outdoor) on the other side of the transparent image display member 5A, the contrast of the light transmitted from the other side of the transparent image display member 5A is improved. Therefore, the contrast of the scene on the other side of the image display transparent member 5A seen from the observer on the first surface A side is improved, and the visibility of the scene at night is excellent.
When a material having polarization dependence is used for the first transparent base material 10A, by aligning the direction of high transmittance of the material having polarization dependence in the same direction as the main polarization direction of the projection light L, the image light can be transmitted. The visibility of the observer X can be improved by increasing the transmittance of the scene on the far side while suppressing the decrease in the gain.

As shown in FIG. 14, the transmissive image display transparent member of the present invention has a first transparent base material 10 and a second transparent base material 20A which are not colored without being blended with light attenuation components. A light attenuation layer 50 is arranged on the surface of the second transparent base material 20A opposite to the image display section 40. The light attenuation layer 50 is colored by blending a light attenuation component, and attenuates part of the light transmitted through the transparent member. It may be the image display transparent member 7 that has been formed. The second transparent base material 20A and the light attenuation layer 50 are adhered by an adhesive layer 52. As shown in FIG.
The light attenuation layer 50 and the adhesive layer 52 of the image display transparent member 7 are the same as the light attenuation layer 50 and the adhesive layer 52 of the image display transparent member 3 .
In the image display transparent member 7, similarly to the image display transparent member 5, the contrast of the scene on the other side of the image display transparent member 7 seen from the observer on the side of the second surface B is improved, and the visibility of the scene is improved. Excellent.

As shown in FIG. 15, the transmissive image display transparent member of the present invention omits the first transparent base material 10 and the second transparent base material 20, and does not include the second transparent film 45 of the image display section 40. An image display transparent member 8A having a light attenuation layer 50 disposed on the surface thereof may be used. In the image display transparent member 8A, similarly to the image display transparent member 5, the contrast of the scene on the other side of the image display transparent member 8A seen from the observer on the side of the second surface B is improved, and the visibility of the scene is improved. Excellent.
Further, as shown in FIG. 16, the first transparent base material 10 and the second transparent base material 20 are omitted, and the light attenuation layer 50 is arranged on the surface of the first transparent film 41 of the image display section 40. It may be the display transparent member 8B. In the image display transparent member 8B, similarly to the image display transparent member 5A, the contrast of the scene on the other side of the image display transparent member 8B viewed from the observer on the first surface A side is improved, and the visibility of the scene is improved. Excellent.

The image display transparent members 8A and 8B can be attached to an existing windowpane or the like using an adhesive layer. Also, the image display transparent members 8A and 8B can be deformed and are suitable for forming an image display transparent member having a curved surface.
Moreover, in the image display transparent members 8A and 8B of FIGS. 15 and 16, the first transparent film 41 and the second transparent film 45 may be replaced with transparent substrates to have an image display portion.

As shown in FIG. 17, the transmissive image display transparent member of the present invention has a first transparent substrate 10A and a second transparent substrate 20 both colored by blending light attenuation components. It may be the transparent member 5B.
In the image display transparent member 5B, for the same reason as the image display transparent member 5, the contrast of the scene on the other side of the image display transparent member 5B seen from the observer on the side of the second surface B is improved, and the scene is visually recognized. Excellent in nature.

As shown in FIG. 18, the reflective image display transparent member of the present invention has a first transparent base material 10 and a second transparent base material 20A which are not colored without being blended with light attenuation components. and an image display transparent member 5C having an image display portion 40A, which is colored by blending a light attenuation component in the second transparent film 45A, and which serves as a light attenuation layer that attenuates part of the light transmitted through the transparent member. may
In the image display transparent member 5C, for the same reason as in the image display transparent member 5, the contrast of the scene on the other side of the image display transparent member 5C seen from the observer on the side of the second surface B is improved, and the scene is visually recognized. Excellent in nature.

Further, in the image display transparent member 5C, instead of the second transparent film 45A, the first transparent film 41 is mixed with a light attenuation component and colored to attenuate part of the light transmitted through the transparent member. It may be a layered image display transparent member. In addition, both the first transparent film 41 and the second transparent film 45 are colored by blending a light attenuation component to form a light attenuation layer that attenuates part of the light transmitted through the transparent member. It may be a member.
Further, in the transparent image display member 5 of the present invention, the transparent image display member 5 has a second transparent substrate 20A containing no light attenuation component instead of the second transparent substrate 20. An image display transparent member that is colored by blending a light attenuation component into one or both of the adhesive layer 12 and the adhesive layer 22, and serving as a light attenuation layer that attenuates part of the light that passes through the transparent member. may
Examples of the light-attenuating component to be blended in the transparent film or the adhesive layer of the image display portion include the same ones as those mentioned for the light-attenuating layer 50 .

As for the function of the member serving as the light attenuation layer, it is sufficient that it has the function of reducing the transmittance, so a half mirror may be used as the light attenuation layer.
The reflectance of the half mirror may be 5% or more, preferably 10% or more, and may be 25% or more in some cases.
By arranging the half mirror between the light scattering part 43 and the projector, in addition to the above effect, it is possible to impart a function as a magic mirror, so that it is difficult for the observer to recognize the missing image in the forward direction. be able to Also, by arranging it in a portion not between the light scattering section 43 and the projector, it is possible to project on both sides.
Embodiments of the light attenuation layer in the transmissive image display transparent member of the present invention include the second transparent substrate 20 in FIGS. 10 and 12, the first transparent substrate 10A in FIG. 13, and FIG. 16, the first transparent substrate 10A and the second transparent substrate 20 in FIG. 17, transparent substrates and transparent films, and half mirrors.

In the transmissive image display transparent member of the present invention, the cross-sectional shape of the light scattering portion 43 perpendicular to the longitudinal direction is not limited to a right-angled triangle as shown in the illustrated example, but may be other triangles, trapezoids, bell shapes, or the like. There may be.
Other examples of the light-scattering sheet for the image display part include those that are transmitted, deflected, and diffused by a volume hologram; those that are deflected, scattered, and diffused by a kinoform-type hologram and other structures having an uneven surface. is mentioned.

In addition, as a light scattering sheet for the image display portion, light scattering fine particles are dispersed in the entire transparent layer without providing a plurality of light scattering portions in the transparent layer as in the illustrated example, and the transparent layer itself serves as a light scattering layer. It may be
Examples of light scattering fine particles include fine particles of high refractive index materials such as titanium oxide, zirconium oxide and aluminum oxide; fine particles of low refractive index materials such as porous silica and hollow silica. The concentration of the light scattering fine particles is preferably 0.01 to 5% by volume, more preferably 0.05 to 1% by volume. For the reasons described above, the average particle diameter of the light scattering fine particles is preferably 50 to 1000 nm, more preferably 100 to 800 nm.
The light-scattering layer may include light-attenuating materials for the reasons discussed above. The concentration of the light-attenuating material is preferably 0.01-5% by volume, more preferably 0.1-3% by volume.

EXAMPLES The present invention will be described in detail below with reference to Examples, but the present invention is not limited by the following description.
Examples 2 and 4 are examples, and examples 1 and 3 are comparative examples.

(Example 1)
On the surface of a transparent polyethylene terephthalate (hereinafter referred to as PET) film (manufactured by Toyobo Co., Ltd., Cosmoshine (registered trademark) A4300, thickness: 0.1 mm), an ultraviolet curable resin (manufactured by Osaka Gas Chemicals Co., Ltd., Ogusol ( A solution obtained by mixing 100 parts by mass of a photoinitiator (Irgacure (registered trademark) 907, manufactured by BASF) with 100 parts by mass of a registered trademark EA-F5003) was applied to a thickness of 10 μm by a die coating method.
A white PET film (manufactured by Toray Industries, Inc. E20, arithmetic mean roughness Ra: 0.23 μm) with an irregular uneven structure formed on the surface is placed on the UV curable resin so that the uneven structure is in contact with the UV curable resin. overlaid on

UV rays of 1000 mJ are irradiated from the transparent PET film side to cure the UV curable resin to form a first transparent layer with the irregular concave-convex structure of the white PET film transferred to the surface, and then the white PET film. was peeled off.
A reflective film made of an aluminum thin film (thickness: 8 nm) was formed on the surface of the first transparent layer by physical vapor deposition of aluminum by a vacuum vapor deposition method.

On the surface of the reflective film, 100 parts by mass of an ultraviolet curable resin (Ogusol (registered trademark) EA-F5003, manufactured by Osaka Gas Chemicals Co., Ltd.) and a photoinitiator (Irgacure (registered trademark) 907, manufactured by BASF) are added by 3 masses. The mixed solution was applied to a thickness of 10 μm by a die coating method, and a transparent PET film (thickness: 0.1 mm) was layered on the ultraviolet curable resin.
The image display portion of Example 1 made of the light scattering sheet was obtained by irradiating 1000 mJ of ultraviolet rays to cure the ultraviolet curable resin to form a second transparent layer.

Soda lime glass plate (manufactured by Matsunami Glass Co., Ltd., thickness: 3 mm), polyvinyl butyral (hereinafter referred to as PVB) film (Saflex RK11l manufactured by Solutia, thickness: 375 μm), image display part of Example 1, PVB film ( Thickness: 375 μm) and a soda-lime glass plate (thickness: 3 mm) were laminated in this order and subjected to vacuum heating and pressure bonding to obtain a reflective image display transparent member of Example 1. Table 1 shows the evaluation results of the image display transparent member of Example 1.

(Example 2)
In the image display transparent member of Example 1, colored glass (manufactured by Asahi Glass Co., Ltd., <trade name> Myveil, thickness: 3 mm, x = 0.3069, y = 0 in the xyY color system) is used as the second transparent base material. .3126, Y=28.54) to obtain a reflective image display transparent member of Example 2. Table 1 shows the evaluation results of the image display transparent member of Example 2.

(Example 3)
The surface of a transparent PET film (Cosmoshine (registered trademark) A4300 manufactured by Toyobo Co., Ltd., thickness: 50 μm) was coated with an ultraviolet curable resin (manufactured by Hitachi Chemical Co., Ltd., Hitaroid (registered trademark) 7981, specific gravity 1.1) by blade coating. It was applied to a thickness of 80 μm.
A mold on the surface of which a plurality of ridges with a right-angled triangular cross section corresponding to the light scattering portion are formed is exposed to ultraviolet rays under the conditions of a temperature of 25°C and a gauge pressure of 0.5 MPa so that the ridges come into contact with the UV-curable resin. It was pressed onto the curable resin.

Ultraviolet rays are irradiated from the transparent PET film side to cure the ultraviolet curable resin to form a transparent lower layer (thickness: 10 μm) having grooves corresponding to the ridges of the mold formed on the surface, and then the mold is removed. peeled off. As a result, a plurality of grooves having an interval of 80 μm, a width of 40 μm, a depth of 80 μm, a length of 100 mm, and a cross-sectional shape of a right triangle were formed on the surface of the lower layer of the transparent layer in an area of 100 mm×100 mm.

Titanium oxide fine particles (average particle diameter: 0.2 μm, specific gravity 4.2) are added to an ultraviolet curable resin (Hitaroid (registered trademark) 7981, specific gravity 1.1, manufactured by Hitachi Chemical Co., Ltd.) so as to be 0.1% by volume. A paste was prepared by mixing
The paste was applied to the surface of the lower layer of the transparent layer, and the surplus was scraped off with a doctor blade to fill the grooves of the lower layer of the transparent layer with the paste. A light scattering portion was formed by curing the paste by irradiating with ultraviolet rays.

An ultraviolet curable resin (manufactured by Hitachi Chemical Co., Ltd., Hitaroid (registered trademark) 7981, specific gravity 1.1) was applied to 5 μm on the surface of the lower layer of the transparent layer and the surface of the light scattering part by a die coating method, and a transparent resin was coated on the ultraviolet curable resin. A PET film was overlaid.
An image display portion of Example 3 made of a light scattering sheet was obtained by irradiating ultraviolet rays to cure the ultraviolet curable resin to form a transparent upper layer.

Soda lime glass plate (manufactured by Matsunami Glass Co., Ltd., thickness: 3 mm), PVB film (Saflex (registered trademark) RK11l manufactured by Solutia, thickness: 375 μm), image display portion of Example 3, PVB film (thickness: 375 μm) , a soda-lime glass plate (thickness: 3 mm) were laminated in this order and subjected to vacuum heating and pressure bonding to obtain a transmissive image display transparent member of Example 3. Table 1 shows the evaluation results of the image display transparent member of Example 3.

(Example 4)
In the image display transparent member of Example 3, colored glass (manufactured by Asahi Glass Co., Ltd., <trade name> Myveil, similar to Example 2) is used as the second transparent base material, and the transmissive image display transparent member of Example 4 is used. got the parts. Table 1 shows the evaluation results of the image display transparent member of Example 4.

Evaluation criteria in the table are as follows.
(Sight visibility)
The image display transparent member is installed outdoors in the daytime so that the second surface faces the sun, and the visibility of the scene seen on the other side of the image display transparent member seen from the observer on the second surface side is Evaluation was made according to the following criteria.
0: Good.
1: Good when the front is dark or the outside light is small.
2: A level at which rough recognition is possible.
3: The scene cannot be visually recognized.

(Image visibility)
In Examples 1 and 2, the visibility of the image displayed on the image display transparent member when viewed from the observer X was evaluated according to the following criteria.
0: Good.
1: Good when the surroundings are dark.
2: A level at which rough recognition is possible.
3: The image cannot be visually recognized.

In Examples 2 and 4, which are examples of the present application, the visibility of the scene was good because the scattered light was controlled and the resolution was improved.

The image display transparent member of the present invention can be used for showcases of commodities, etc.; display cases for works of art, animals, etc.; windows of buildings, showrooms, vehicles, etc.; glass doors; indoor transparent partitions; It is useful as a transparent member used. Specifically, it is possible to visually recognize the scene seen on the other side of the transparent member when viewed from the observer side, and to transmit information such as product explanations, various equipment conditions, destination guidance, and communication items to the observer. When displaying the operation screen of various devices to the observer, or when making the scene beyond the transparent member invisible to the observer for privacy protection, security, etc. It is useful as a so-called transparent screen that visually displays image light projected from an image to an observer as an image.
Further, when used for window glass for transportation means such as vehicles and aircraft, it is useful because it can be used as both a transparent screen and a head-up display.
In addition, the entire contents of the specification, claims, drawings and abstract of Japanese Patent Application No. 2014-128552 filed on June 23, 2014 are cited here, and as a disclosure of the specification of the present invention, It is taken in.

1 to 3, 5 to 7, 1A to 1C, 4A, 4B, 5A to 5C, 8A, 8B: image display transparent member, 10: first transparent substrate, 10A: first transparent substrate (light attenuation layer ), 12: Adhesive layer, 20: Second transparent substrate (light attenuation layer), 20A: Second transparent substrate, 22: Adhesive layer, 30, 30A: Image display part, 31: First transparent film , 32: first transparent layer, 33: reflective film, 34: second transparent layer, 35: second transparent film, 35A: second transparent film (light attenuation layer), 36: photocurable resin, 37: photocurable resin, 40, 40A: image display portion, 41: first transparent film, 42: transparent layer, 42a: transparent layer lower layer, 43: light scattering portion, 44: groove, 45: second transparent Film 45A: Second transparent film (light attenuation layer) 46: Photocurable resin 47: Photocurable resin 48: Paste 50: Light attenuation layer 52: Adhesive layer 61: Mold 62: Mold 101: Image display transparent member 102: Image display transparent member 110: First transparent substrate 120: Second transparent substrate 132: First transparent layer 133: Reflective film 134: Second 2 transparent layer, 142: transparent layer, 143: light scattering part, 200: projector, A: first surface, B: second surface, L: image light, X: observer, Y: observer

Claims (11)

It has a first surface and a second surface on the opposite side, transmits the scene on the first surface side so as to be visible to an observer on the second surface side, and transmits the scene on the second surface side. The image light that is visibly transmitted to the observer on the first surface side and projected from the projector installed on the first surface side is visibly displayed to the observer on the second surface side as an image. A transmissive image display transparent member that
Between the first surface and the second surface,
An image display unit having a light scattering layer in which light scattering fine particles are dispersed throughout the transparent layer,
A first transparent base material is provided on the first surface side of the image display part, and a second transparent base material is provided on the second surface side of the image display part,
the second transparent substrate is not an antireflection layer, and the second transparent substrate has a thickness of 0.01 mm or more;
Among the transparent substrates, at least the second transparent substrate serves as a light attenuation layer that attenuates part of the light transmitted through the image display transparent member, and the glass or transparent resin is mixed with a light attenuation component. An image display transparent member which is colored by 2. The transparent image display member according to claim 1, wherein the front haze of said transparent image display member is 4 to 40%. 3. The image display transparent member according to claim 1, wherein the light attenuation layer has polarization dependence. 4. The image display transparent member according to claim 1, wherein the light attenuation layer has a transmittance of 70% or less. Claims 1 to 4, wherein the light attenuation layer is gray (uniform over the entire visible light range (0.25≤x≤0.4, 0.25≤y≤0.4 in the xyY color system)) The image display transparent member according to any one of Claims 1 to 3. 5. The image display transparent member according to claim 1, wherein the light attenuation layer has a bluish tint (x≦0.33, y≦0.5 in the xyY color system). 5. The image display transparent member according to claim 1, wherein the light attenuation layer has a green tint (y>x, 0.33≦y in the xyY color system). The image display transparent member according to any one of claims 1 to 7, wherein the area of the light attenuation layer is the same as or larger than the area of the image display portion. The image display transparent member according to any one of claims 1 to 8, wherein the light-attenuating layer is made of glass or transparent resin and a light-attenuating component. The image display transparent member according to any one of claims 1 to 9;
a projector installed on the first surface side of the image display transparent member;
A video display system with The image display transparent member according to any one of claims 1 to 9,
An image display method comprising projecting image light from a projector installed on a first surface side of an image display transparent member to display an image.

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