JP6725029B2 - Image display transparent member, image display system, and image display method - Google Patents

Description

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

The following have been proposed as transparent members used for showcases of products and the like; display cases of art and the like; windows of buildings, showrooms, vehicles, etc.; glass doors;
You can see the sight on the other side of the transparent member from the observer's side, and when transmitting information such as product description, various device status, destination guidance, and information to be transmitted to the observer. On the other hand, when displaying the operation screens of various devices, or when making it impossible for the observer to see the scene behind the transparent member for privacy protection, security, etc., the image projected from the projector An image display transparent member (so-called transparent screen) that visually displays light as an image for an observer.

The image display transparent member includes a reflection-type image display transparent member that visually displays the image light projected from the projector as an image to an observer on the same side as the projector; the image light projected from the projector There is a transmissive image display transparent member for visually displaying as an image to an observer on the opposite side of the projector. However, the conventional image display transparent member has low transparency (high haze) and visibility of the scene is poor.

As the reflection type image display transparent member, for example, as shown in FIG. 19, between the first transparent base material 110 and the second transparent base material 120, a regular uneven structure (microlens) is formed on the surface. Array), a first transparent layer 132, a reflective film 133 formed along the surface of the first transparent layer 132 on the side of the concavo-convex structure and transmitting a part of 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 133 has been proposed (see Patent Document 1).

In the reflection type 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 second transparent base material 120 side, An image is formed by being scattered in the reflection film 133, and is visually displayed as an image for an observer X on the same side as the projector 200. The image display transparent member 101 has high transparency (low haze), high visibility of the scene, and high screen gain of the image.
Further, both the observer X on the same side as the projector 200 and the observer Y on the opposite side to the projector 200 can see the scene on the other side of the image display transparent member 101 as viewed from the observer side.

However, the reflection-type image display transparent member 101 has a problem that the visibility of the scene on the other side of the image display transparent member 101 is reduced from the viewpoint of the observer. Specifically, the reflected light scattered by the sun or illumination that is incident on the image display transparent member 101 from the side of the viewer who is trying to see the scene on the other side is reflected and scattered by the reflection film 133, so that the other side of the image display transparent member 101. The contrast of the light transmitted from the image display device is reduced, and the visibility of the scene on the other side of the image display transparent member 101 is reduced.
For example, when the reflection-type image display transparent member 101 is used for the window, the window appears white and blurred to the observer Y outside the window due to the reflected and scattered light that the sunlight L1 is scattered by the reflective film 133 during the daytime. , The visibility of the scene inside the window is reduced. Further, in this case, at night, the window L is dimly seen by the observer X in the room due to the reflected and scattered light that is the illumination light L2 scattered by the reflection film 133, and the visibility of the scene outside the window is deteriorated.

As the transmissive image display transparent member, for example, as shown in FIG. 20, between the first transparent base material 110 and the second transparent base material 120, the transparent layer 142 and the inside of the transparent layer 142 are provided. There is proposed an image display transparent member 102 having a plurality of light scattering portions 143 arranged in parallel with each other and arranged at a predetermined interval and extending 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 first transparent substrate 110 side is An image is formed by being scattered in the light scattering section 143, and is visually displayed as an image for an observer Y 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 to the projector 200 can see the scene on the other side of the image display transparent member 102 when viewed from the observer side.

However, in the transmissive image display transparent member 102, as in the case of the reflective image display transparent member 101, there is a problem that the visibility of the scene on the other side of the image display transparent member 102 is reduced from the viewpoint of the observer. is there. Specifically, when the observer tries to see the scene on the other side, the straight light coming from the scene on the other 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 reflected light scattered by the light scattering portion 143 from the light of the sun or the illumination that is incident on the image display transparent member 102 from the viewer side who is trying to see the scene on the other side is transmitted from the other side of the image display transparent member 102. The contrast of the 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 is reduced from the observer Y outside the window during the day due to the reflected and scattered light by the sunlight L1. However, at night, the visibility of the scene outside the window is reduced from the observer X in the room due to the reflected and 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 which has improved visibility of the scene on the other side of the transparent member when viewed from the observer and is excellent in 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 of the first surface, and transmits a scene on the first surface side so that it can be visually recognized by an observer on the second surface side. The image light projected from the projector installed on the first surface side is visually perceived as an image by the observer on the first surface side while observing A reflective image display transparent member capable of displaying,
Between the first surface and the second surface,
A first transparent layer having an uneven structure on its surface;
A reflective film formed along the surface of the concavo-convex structure of the first transparent layer and transmitting a part of incident light;
A reflective film formed so as to cover the surface of the reflective film and transmitting a part of incident light;
A second transparent layer provided so as to cover the surface of the reflective film,
An image display unit having
A first transparent base material is provided on the first surface side of the video display unit, and a second transparent base material is provided on the second surface side of the video display unit,
An image display transparent member in which at least a second transparent base material of the transparent base material is a light attenuation layer that attenuates a part of light transmitted through the image display transparent member.
[2] The forward haze is 20% or less,
Backward haze is 5% or more,
The image display transparent member according to [1], wherein the ratio of the rear haze to the front haze (rear haze/front haze) is 1 or more.
[3] The image display transparent member according to [1] or [2], wherein the uneven structure on the surface of the first transparent layer is an irregular uneven structure.
[4] It has a first surface and a second surface on the opposite side to the second surface, and transmits the scene on the first surface side so that it can be visually recognized by an observer on the second surface side. The image light projected from the projector installed on the first surface side is visually perceived as an image by the viewer installed on the first surface side. A transparent 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 particles are dispersed throughout the transparent layer,
A first transparent base material is provided on the first surface side of the video display unit, and a second transparent base material is provided on the second surface side of the video display unit,
An image display transparent member, wherein at least a second transparent substrate of the transparent substrates is a light attenuation layer that attenuates a part of light transmitted through the image display transparent member.
[5] The image display transparent member according to [4], wherein the front haze is 4 to 40%.
[6] The image display transparent member according to any one of [1] to [5], wherein the light attenuation layer has polarization dependency.
[7] The image display transparent member according to any one of [1] to [6], wherein the light attenuation layer has a transmittance of 70% or less.
[8] The light attenuation layer is gray (uniform over the entire visible light (0.25 to x to 0.4, 0.25 to y to 0.4 in the xyY color system)), [1 ] The image display transparent member in any one of [7].
[9] The image display transparent member according to any one of [1] to [7], wherein the light attenuation layer is bluish (x to 0.33, y to 0.5 in the xyY color system).
[10] The image display transparent member according to any one of [1] to [7], wherein the light attenuation layer is greenish (y>x, 0.33 to y in the xyY color system).
[11] The image display transparent member according to any one of [1] to [10], wherein the area of the light attenuation layer is equal to or larger than the area of the image display unit.
[12] The image display transparent member according to any one of [1] to [11],
A projector installed on the first surface side of the image display transparent member,
Video display system equipped with.
[13] In the image display transparent member according to any one of [1] to [11],
An image display method in which image light is projected from a projector installed on the first surface side of the 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 as seen by the observer is improved, and the visibility is excellent.

FIG. 1 is a schematic configuration diagram showing an example of a video display system of the present invention and a layer configuration diagram showing an example of a reflective type video display transparent member of the present invention. It is sectional drawing which shows an example of the manufacturing process of the reflection type image display transparent member of this invention. It is a layer block diagram which shows the other example of the reflection type image display transparent member of this invention. It is a layer block diagram which shows the other example of the reflection type image display transparent member of this invention. It is a layer block diagram which shows the other example of the reflection type image display transparent member of this invention. It is a layer block diagram which shows the other example of the reflection type image display transparent member of this invention. It is a layer block diagram which shows the other example of the reflection type image display transparent member of this invention. It is a layer block diagram which shows the other example of the reflection type image display transparent member of this invention. It is a layer block diagram which shows the other example of the reflection type image display transparent member of this invention. It is the schematic block diagram which shows the other example of the image display system of this invention, and the layer block diagram which shows an example of the transmissive image display transparent member of this invention. It is sectional drawing which shows an example of the manufacturing process of the transmissive image display transparent member of this invention. It is a layer block diagram which shows the other example of the transmissive image display transparent member of this invention. It is a layer block diagram which shows the other example of the transmissive image display transparent member of this invention. It is a layer block diagram which shows the other example of the transmissive image display transparent member of this invention. It is a layer block diagram which shows the other example of the transparent image display transparent member of this invention. It is a layer block diagram which shows the other example of the transmissive image display transparent member of this invention. It is a layer block diagram which shows the other example of the transmissive image display transparent member of this invention. It is a layer block diagram which shows the other example of the transparent image display transparent member of this invention. It is a layer block diagram which shows an example of the conventional reflective type image display transparent member. It is a layer block diagram which shows an example of the conventional transmissive image display transparent member.

The following definitions of terms apply throughout the specification and claims.
The "first surface" means the outermost surface of the image display transparent member, which is the surface on the side where the image light is projected from the projector.
The "second surface" means the outermost surface of the image display transparent member, which is the surface opposite to the first surface.
The "view on the first surface side (second surface side)" means the other side of the image display transparent member as seen by an observer on the second surface side (first surface side) of the image display transparent member. It means an image that can be seen on the side (main objects (articles, works, people, etc.) and their backgrounds, landscapes, etc.). The scene does not include the image displayed by the image light projected from the projector formed on the image display transparent member.
The “forward haze” is the incident light that is transmitted from the first surface side to the second surface side or the transmitted light transmitted from the second surface side to the first surface side due to forward scattering. Means the percentage of transmitted light deviated 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).
The “rear haze” means the percentage of the reflected light that is deviated by 0.044 rad (2.5°) or more from the specular reflected light due to scattering, of the reflected light that is reflected on the first surface.
The “concavo-convex structure” means a convex-concave 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 convex portions or concave portions do not appear periodically and the convex portions or concave portions have irregular sizes.
The arithmetic average roughness (Ra) is an arithmetic average 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 a value in which the ratio of the total amount of light transmitted and scattered in the forward direction to the incident light is a percentage.
The reflectance is a value in which the ratio of the total amount of light reflected and scattered backward to the incident light is a percentage.
The transmittance, reflectance and refractive index are values measured at room temperature using the d-line (wavelength 589 nm) of a sodium lamp.

<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 opposite to the first surface, so that a scene on the first surface side can be viewed by an observer on the second surface side. It is 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 on the observer on the first surface side. An image display transparent member that is visibly displayed as an image, wherein the image display transparent member has a light attenuating layer that attenuates a part of the light transmitted through the image display transparent member, and is a reflective image display transparent member. It is a member.

FIG. 1 is a layer configuration diagram showing an example of a reflective image display transparent member of the present invention.
In the image display transparent member 1, the image display unit 30 is arranged between the first transparent base material 10 and the second transparent base material 20, and the light attenuation component is mixed in the second transparent base material 20. It is a light attenuating layer which is colored and attenuates part of the light transmitted through the image display transparent member 1.
The first transparent base material 10 and the video display unit 30 are bonded by the adhesive layer 12, and the second transparent base material 20 and the video display unit 30 are bonded by the adhesive layer 22.

(First transparent substrate)
Examples of the material of the first transparent substrate 10 include glass and transparent resin.
Examples of the glass constituting the transparent substrate include soda lime glass, non-alkali glass, borosilicate glass, aluminosilicate glass and the like. The first transparent base material 10 made of glass may be chemically strengthened, physically strengthened, hard coated, 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, polymethylmethacrylate, etc., which have weather resistance and transparency. From the viewpoint, polycarbonate, polyester, and cycloolefin polymer are preferable.

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

(Second transparent base material (light attenuation layer))
The second transparent base material 20 is mixed with a light attenuation component and is colored, and also serves as a light attenuation layer that attenuates a 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 the 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. It will be excellent.

Examples of the material of the second transparent base material 20 include glass, transparent resin, and the like mentioned as the material of the first transparent base material 10 and a light attenuation component.
Examples of the light attenuation component contained in the glass include Fe ₂ O ₃ , CoO, Ti ₂ O, V ₂ O ₅ , CuO, Cr ₂ O ₃ , NiO, Er ₂ O ₃ , Nd ₂ O ₃ , CeO ₂ , Examples thereof include metal oxides such as MnO ₂ and SeO _x , and it is preferable that Fe and Cu are included from the viewpoint of imparting a function such as cutting infrared rays.
Examples of the light-attenuating component contained in the transparent resin include pigments such as carbon black and titanium black and dyes such as azine compounds, and the pigment is preferable from the viewpoint of weather resistance.

Further, the second transparent substrate 20 may have polarization dependency. For example, of the light quantity contained in the image light L from the projector, the polarization direction of a large amount of light and the polarization direction on the side where the second transparent base material 20 attenuates more are aligned. As a result, the image light L can be efficiently absorbed while having a high transmittance, and the visibility of the scene of the observer Y can be improved.
Examples of the light attenuation component having polarization dependence include dichroic dyes, metal nanorods, and the like. Further, the second transparent base material having polarization dependency can also be prepared by stretching a transparent resin containing iodine, dye, silver or the like. Moreover, you may use what formed the wire grid structure on the surface of the 2nd transparent base material 20, and provided the polarization dependence. As for the polarization dependency, if the transmittance ratio is 2 or more, the difference with a light-attenuating material having no polarization dependency will be felt as the brightness of the scene, and is preferably 5 or more. Particularly preferably, it is 10 or more.

The transmittance of the second transparent base material 20 of the light attenuation layer is preferably 3% or more, and preferably 5% or more from the viewpoint of the visibility of the scene on the other side of the image display transparent member 1 from the viewpoint of the observer Y. More preferably, 10% or more is still more preferable.
The transmittance of the second transparent base material 20 of the light attenuating layer is preferably 70% or less, and preferably 50% or less from the viewpoint of increasing the contrast of the scene on the other side of the image display transparent member 1 when viewed from the observer Y. It is more preferably 30% or less, still more preferably 10% or less.
The haze of the second transparent base material 20 of the light attenuation layer is preferably 10% or less, more preferably 5% or less, further preferably 2% or less, and 1% or less from the viewpoint of making it difficult to form an image in the light attenuation layer. Is particularly preferable.

The color of the second transparent base material 20 of the light attenuating layer is preferably gray, which uniformly diminishes the light, because the contrast of the scene or the projected image can be improved. The preferred range is 0.25 to x to 0.4, 0.25 to y to 0.4 in the xyY color system, and 0.27 to x to 0.38, 0.27 to y. It is preferable that it is 0.38.

It is preferable for the color of the second transparent base material 20 of the light attenuation layer to be bluish because the visibility of the scene is improved. As a preferable range, x to 0.33 and y to 0.5 are preferable in the xyY color system.

If the color of the second transparent base material 20 of the light attenuation layer is greenish, the transmittance of the region with high visibility can be secured even when using privacy glass that reduces the amount of transmitted light. Therefore, it is possible to obtain both the effect by efficiently cutting visible light, infrared light, and ultraviolet light and the securing of the visual field. As a preferable range, y>x and 0.33 to y are preferable 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 unit 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 unit 30. As a result, a part of the reflected and scattered light obtained by scattering the light (such as sunlight) incident from the viewer Y side by the reflection film described later is stably absorbed by the light attenuation layer. Therefore, as seen from the observer Y, the reduction in the contrast of the scene on the other side of the image display transparent member is stably suppressed, and the excellent visibility of the scene on the other side of the image display transparent member 1 is likely to be stably realized. Become.

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

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

Examples of the thermoplastic resin contained in the thermoplastic resin composition include plasticized polyvinyl acetal, plasticized polyvinyl chloride, saturated polyester, plasticized saturated polyester, polyurethane, plasticized polyurethane, ethylene-vinyl acetate copolymer, ethylene. -Ethyl acrylate copolymer etc. are mentioned.

The thickness of the adhesive layer may be such that the function as the adhesive layer is maintained, and for example, 0.01 to 1.5 mm is preferable, and 0.05 to 1 mm is more preferable.

(Video display section)
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 first transparent layer 32. A reflecting film 33 formed along the surface of the concave-convex structure side and transmitting a part of incident light; a second transparent layer 34 provided so as to cover the surface of the reflecting film 33; And a second transparent film 35 provided on the surface of the transparent layer 34.

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

Examples of the transparent resin forming 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 such that a roll-to-roll process can be applied, for example, 0.01 to 0.5 mm is preferable, 0.05 to 0.3 mm is more preferable, and 0.2 mm or less is further preferable.

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

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

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

The arithmetic mean roughness Ra of the irregular concavo-convex 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. When the arithmetic average roughness Ra is within this range, the projected image has a wide viewing angle, the specular reflection light can be visually recognized without directly looking at it, and the graininess due to the uneven structure can be suppressed. When the arithmetic average roughness Ra is 10 μm or less, it is more preferable that the concavo-convex structure does not get in the way when the scene on the other side of the image display transparent member 1 is viewed.

(Reflective film)
The reflection film 33 may be one that transmits part of the light incident on the reflection film 33 and reflects 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, and combinations thereof.

As the metal forming the metal film and the semiconductor film, Al, Ag, Ni, Cr, W, Si and the like are considered, and particularly Al or Ag or an alloy containing them as a main component is preferable.
Examples of the dielectric material forming the dielectric film include metal oxides and metal nitrides.
The reflection film 33 is preferably a metal thin film or a film structure in which 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 due to the arithmetic average roughness Ra of the irregular asperity structure formed on the surface of the first transparent layer 32 can be utilized without hindering it, 4 to 25 nm is more preferable.
The arithmetic mean roughness Ra of the irregular asperity structure of the reflective film 33 is preferably 0.01 to 20 μm, and more preferably 0.05 to 10 μm for the same reason as that of the first transparent layer 32.
The reflectance of the reflective film 33 is preferably 5% or more, more preferably 15% or more, and further preferably 30% or more, as a range in which a sufficient screen gain can be obtained.

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

As shown in FIG. 2( a ), the mold 61 having the irregular concave-convex structure formed on the surface is coated with the photocurable resin 36 on the surface of the first transparent film 31, and the concave-convex structure is photocurable. It is laid on the photocurable resin 36 so as to be in contact with the resin 36.

Light (ultraviolet rays or the like) is irradiated from the side of the first transparent film 31 to cure the photocurable resin 36, thereby forming the first transparent layer 32 in which the irregular concavo-convex structure of the mold 61 is transferred to the surface. After that, the mold 61 is peeled off as shown in FIG.

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

As shown in FIG. 2D, a photocurable resin 37 is applied to the surface of the reflective film 33, and a second transparent film 35 is superposed on the photocurable resin 37.
By irradiating light (ultraviolet rays or the like) 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, an image is obtained. Obtain the display unit 30.

Examples of the mold 61 include a resin film, a metal plate, and the like having an irregular concavo-convex structure formed on the surface. Examples of the resin film having an irregular concavo-convex structure formed on its surface include a resin film containing fine particles and a sandblasted resin film.
Examples of the method for 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 vapor 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, and more preferably 10% 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 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, further 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 more preferably 10%, from the viewpoint of good visibility of the scene seen from the viewer side on the other side of the image display transparent member 1. The following are more preferable.

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 for increasing the regular reflectance. 10% or more is more preferable, and 15% or more is further preferable.
The rear haze of the image display transparent member 1 is preferably 90% or less, and 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 side.

The ratio of the rear haze to the 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 within the range in which the line of sight of the viewer who views the image display transparent member 1 reaches, the other side of the image display transparent member 1 is seen from the viewer side. The view seen on the side has good visibility, and the projected image and the view on the other side of the image display transparent member 1 can be seen. Such an image display transparent member 1 is suitable for being used in an environment where ambient light exists.

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

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

FIG. 1 is a schematic configuration diagram showing an example of a video 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 one that can project the image light L onto the image display transparent member 1. The projector 200 may be a known projector or the like.

(Image display method using a reflective image display transparent member)
According to a first aspect of the image display method of the present invention, image light is projected on a reflective 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 to be displayed.

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

(Mechanism of action)
In the reflective image display transparent member 1 and the image display system and image display method using the same as described above, for example, the image display transparent member 1 is used as a window so that the second surface B is outdoors. 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 a part of the reflected scattered light is the second transparent base material 20 which is the light attenuation layer. It is 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, as viewed from the observer Y, the contrast of the scene on the other side of the image display transparent member 1 is improved, and the visibility of the scene in the daytime is excellent.
Further, the absorption of the reflected and scattered light by the second transparent base material 20 which is the 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 a window having the second surface B as the outdoor side.

Further, in the reflection type image display transparent member 1 of this example, a 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 the light attenuation layer. Therefore, when viewed from the observer X, the contrast of the image by the image light projected from the projector 200 is improved, and the visibility is excellent.

(Other embodiments)
The reflection-type image display transparent member of the present invention has a first surface and a second surface opposite to the first surface, so that a scene on the first surface side can be seen by an observer on the second surface side. It is 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 on the observer on the first surface side. The image display transparent member visibly displayed as an image on the image display transparent member, as long as the image display transparent member has a light attenuating layer for attenuating a part of the light transmitted through the image display transparent member. The image display transparent member 1 is not limited to one. Hereinafter, the same components as those of the image display transparent member 1 of FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.

The reflective image display transparent member of the present invention may be the image display transparent member 2 in which the first transparent substrate 10 is omitted, as shown in FIG. Specific examples of the image display transparent member 2 include 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 unit 30 is attached to an existing window glass or the like. ..
Further, in a double-layer glass having two glass plates and a frame-shaped spacer which is interveningly arranged at the peripheral edge of the glass plates so that a gap is formed between the glass plates, one of the glass plates is a colored glass plate. The image display unit 30 may be attached to the inner surface of one of the glass plates.

As shown in FIG. 4, the reflection-type image display transparent member of the present invention is colored with a light attenuation component in place of the first transparent base material 10 so that a part of the light transmitted through the transparent member is partially colored. An image having a first transparent base material 10A which is a light attenuating layer to be attenuated and, instead of the second transparent base material 20, a second transparent base material 20A which is not mixed with a light attenuating component and is not colored. The display transparent member 1A may be used.
As the first transparent base material 10A colored with the light attenuation component, 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 in which the light attenuation component is not mixed and is not colored, the same as the first transparent base material 10 of the image display transparent member 1 can be mentioned.

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 is outside, the light L2 of the illumination incident on the image display transparent member 1A from the first surface A side. A part of the reflected and scattered light scattered by the reflective film 33 is absorbed by the first transparent base material 10A, which is the light attenuation layer, and reduced. As a result, when an observer on the first surface A side views a scene on the other side of the image display transparent member 1A, the contrast of light transmitted from the other side of the image display transparent member 1A is improved. Therefore, as viewed by the observer on the first surface A side, the contrast of the scene on the other side of the image display transparent member 1A is improved, and the visibility of the scene at night is excellent.
Further, in this example, the first transparent base material in which a part of the reflected scattered light in which the image light projected from the projector 200 (not shown) on the first surface A side is scattered by the reflective film 33 is the light attenuation layer. The absorption of 10 A reduces the gain of the image as compared with the case without the light attenuation layer, but this can be dealt with by increasing the amount of image light from the projector 200.
Further, when a light-attenuating material having polarization dependence is used, the visibility of the scene can be improved by suppressing the decrease in gain by aligning the polarization direction of transmitting the projection light L (not shown). It is possible and preferable.

As shown in FIG. 5, the reflection type image display transparent member of the present invention includes a first transparent base material 10 and a second transparent base material 20A which are not colored with a light attenuation component and are not colored. , A light-attenuating layer 50 for attenuating a part of the light transmitted through the transparent member is arranged on the surface of the second transparent base material 20A on the side opposite to the image display unit 30, and is colored with a light-attenuating component. The image display transparent member 3 may be used. 20 A of 2nd transparent base materials and the light attenuation layer 50 are adhere|attached by the adhesive layer 52.

Examples of the light attenuating layer 50 include a colored transparent film that is colored by blending a light attenuating component. The colored transparent film may be a colored transparent resin film that is colored by blending a light attenuating component, or may be a thin colored glass film that is colored by blending a light attenuating component, and is a thin film having a large extinction coefficient. It may be a material.
Examples of the transparent resin of the colored transparent resin film forming the light attenuating layer 50 include polycarbonate, polyester (polyethylene terephthalate, polyethylene naphthalate, etc.), cycloolefin polymer, polymethyl methacrylate, and the like.
Examples of the light attenuating component in the light attenuating layer 50 include pigments such as carbon black and titanium black and dyes such as azine compounds, and the pigment is preferable from the viewpoint of weather resistance.
Examples of the thin film material having a large absorption coefficient in 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 dependency to the light attenuating layer 50, dichroic dyes, nanorods of metal or the like, stretched iodine or Ag, or obliquely vapor-deposited absorption thin film may be used.

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

For the same reason as the image display transparent member 1, the image display transparent member 3 improves the contrast of the scene on the other side of the image display transparent member 3 as seen by the viewer on the second surface B side, and the visual recognition of the scene is improved. Excellent in performance. Moreover, the visibility of the image by the image light projected from the projector 200 (not shown) on the first surface A side is excellent as seen by the observer on the first surface A side.

As shown in FIG. 6, the reflection-type image display transparent member of the present invention omits the first transparent base material 10 and the second transparent base material 20 and includes the second transparent film 35 of the image display unit 30. The image display transparent member 4A having the light attenuating layer 50 on the surface may be used. For the same reason as the image display transparent member 1, the image display transparent member 4A improves the contrast of the scene on the other side of the image display transparent member 4A when viewed from the observer on the second surface B side, and visually recognizes the scene. Excellent in performance. Moreover, the visibility of the image by the image light projected from the projector 200 (not shown) on the first surface A side is excellent as seen by the observer on the first surface A side.
Further, as shown in FIG. 7, an image in which 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 unit 30. It may be the display transparent member 4B. For the same reason as the image display transparent member 1A, the image display transparent member 4B improves the contrast of the scene on the other side of the image display transparent member 4B when viewed from the observer on the first surface A side, and visually recognizes the scene. Excellent in performance.

The image display transparent members 4A and 4B can be attached to an existing window glass or the like by using an adhesive layer. Further, 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.
Further, the image display transparent members 4A and 4B of FIGS. 6 and 7 may have image display portions in which the first transparent film 31 and the second transparent film 35 are replaced with transparent base materials.

As shown in FIG. 8, the reflective type image display transparent member of the present invention has an image display having a first transparent base material 10A and a second transparent base material 20 which are both colored with a light attenuation component. It may be the transparent member 1B.
For the same reason as the image display transparent member 1, the image display transparent member 1B improves the contrast of the scene on the other side of the image display transparent member 1B when viewed from the observer on the second surface B side, and the visual confirmation of the scene is made. Excellent in performance. Moreover, the visibility of the image by the image light projected from the projector 200 (not shown) on the first surface A side is excellent as seen by the observer on the first surface A side. Further, for the same reason as that of the image display transparent member 1A, the contrast of the scene on the other side of the image display transparent member 1B is improved as seen by the observer on the first surface A side, and the visibility of the scene is excellent.

As shown in FIG. 9, the reflection type 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 mixed with a light attenuation component and are not colored. The image display transparent member 1C having the image display portion 30A which is a light attenuation layer which is colored by mixing the second transparent film 35A with a light attenuation component and which is colored. May be.
For the same reason as the image display transparent member 1, the image display transparent member 1C improves the contrast of the scene on the other side of the image display transparent member 1C as seen by the observer on the second surface B side, and visually recognizes the scene. Excellent in performance. Moreover, the visibility of the image by the image light projected from the projector 200 (not shown) on the first surface A side is excellent as seen by the observer on the first surface A side.

In addition, 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 and colored, and light attenuation that attenuates a part of the light transmitted through the transparent member. It may be a layered image display transparent member. In addition, a transparent image display, which is a light attenuation layer that mixes and is colored with a light attenuation component in both the first transparent film 31 and the second transparent film 35 to attenuate a part of the light transmitted through the transparent member. It may be a member.
Further, the reflection type image display transparent member of the present invention has, in the image display transparent member 1, a second transparent base material 20A in which a light attenuation component is not mixed, instead of the second transparent base material 20. The image display transparent member is a light attenuating layer that is colored by mixing a light attenuating component into one or both of the adhesive layer 12 and the adhesive layer 22, and attenuates a part of light transmitted through the transparent member. May be.
Examples of the light-attenuating component mixed in the transparent film or the adhesive layer of the image display unit include the same as those listed for the light-attenuating layer 50.

Since the function of the member serving as the light attenuating layer is only to have the function of reducing the transmittance, a half mirror may be used as the light attenuating 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 disposing the half mirror between the image display unit and the projector, in addition to the above effects, it is possible to perform projection on both sides. Further, by arranging it in a portion 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 further make it difficult for an observer to recognize a backward image drop. Become.
As the aspect of the light attenuation layer in the reflective image display transparent member of the present invention, as described above, the second transparent base material 20 of FIGS. 1 and 3, the first transparent base material 10A of FIG. ~ The colored transparent film of FIG. 7, the transparent base material and transparent film as illustrated in the 1st transparent base material 10A and the 2nd transparent base material 20 in FIG. 8, and a half mirror are mentioned.

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

In the light-scattering sheet of the image display unit, if the light-scattering sheet can maintain its shape without the transparent film, it is not always necessary to provide the transparent film on the light-scattering sheet.

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 (microlens array or the like). However, for the following reasons, it is preferable that the uneven structure on the surface of the first transparent layer is an irregular uneven structure.
When a reflective film is formed on the surface of a regular concavo-convex structure (microlens array, etc.), light diffraction causes color unevenness in the scene seen from the viewer's side on the other side of the image display transparent member, or due to spectral separation. The edge part of the scene seen on the other side of the image display transparent member when viewed from the observer's side looks like a rainbow color, and the visibility is impaired. On the other hand, when a reflective film is formed on the surface of the irregular asperity structure, light diffraction and spectroscopy 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 suppress the spectrum of the scene seen on the other side of the image display transparent member. As a result, it is possible to provide the property as a transparent screen that is excellent in the visibility of the scene seen on the other side of the image display transparent member and does not obstruct the line of sight.

Further, as another example of the concavo-convex structure with a reflection film, and the one after embedding the concavities and convexities, one in which a scattering material is laminated on a half mirror; one that is reflected, deflected, and diffused by a volume hologram; a kinoform hologram, Other materials that are deflected, reflected, or diffused by a textured surface or a structure in which a reflective film is formed on the textured surface; The surface of cholesteric liquid crystal is roughened by etching, etc., the liquid crystal layer of cholesteric liquid crystal is formed on the base material of horizontal alignment and vertical alignment, and the one in which a surfactant is added to cholesteric liquid crystal is applied on the base material. Then, the coating surface is vertically distributed, or the orientation of the coating surface is reduced).
Further, if the first transparent base material 10 can sufficiently reflect and scatter light even if the first transparent substrate 10 does not have a reflective film, it is not always necessary to provide a reflective film.

<Transparent 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, so that a scene on the first surface side can be seen by an observer on the second surface side. It is 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 observed on the second surface side. An image display transparent member that is visibly displayed as an image, wherein the image display transparent member has a light-attenuating layer that attenuates a part of 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. Hereinafter, the same components as those of the image display transparent member 1 of FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.
In the image display transparent member 5, the image display section 40 is arranged between the first transparent base material 10 and the second transparent base material 20, and the light attenuation component is mixed in the second transparent base material 20. It is a light attenuating layer which is colored and attenuates part of the light transmitted through the image display transparent member 1.
The first transparent base material 10 and the image display unit 40 are bonded by the adhesive layer 12, and the second transparent base material 20 and the video display unit 40 are bonded by the adhesive layer 22.
In the image display transparent member 5, since the second transparent base material 20 is the 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. It will be excellent.

(Video display section)
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; and arranged inside the transparent layer 42 in parallel with each other and at a predetermined interval. A light-scattering sheet having a plurality of light-scattering portions 43 extending in the plane 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, the structure in which the plurality of light-scattering portions 43 extending in the one-dimensional direction in a stripe shape is formed may be referred to as a louver structure.

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

The thickness of the transparent layer 42 is preferably 10 to 200 μm. When 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 sufficiently exhibited. When 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 includes, for example, a transparent resin, a light-scattering material, and optionally a light-attenuating material.

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

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

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

When the light scattering portion 43 includes the light attenuating material, a part of the light propagating in the image display transparent member 5 as unnecessary stray light can be attenuated and the scattered light is reduced. 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. Further, the contrast of the scene seen from the 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 the 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.
Examples of the light attenuating material include carbon black and titanium black.
The concentration of the light attenuating material is preferably 0.01 to 10% by volume, more preferably 0.1 to 3% by volume.

The distance between the light scattering portions 43 (distance between the centers of the adjacent light scattering portions 43) is preferably 10 to 250 μm, and more preferably 10 to 100 μm. If the distance between the light scattering portions 43 is 10 μm or more, it is easy to form the light scattering portions 43. When the distance between the light scattering portions 43 is 250 μm or less, it is difficult to visually recognize the light scattering portions 43.

The width of the light scattering portion 43 (the surface direction of the image display portion 40 and the direction orthogonal to the longitudinal direction of the light scattering portion 43) is preferably 10 to 70% of the distance between the light scattering portions 43, and more preferably 25 to 50%. .. If the width of the light scattering portions 43 is 10% or more of the distance between the light scattering portions 43, the light scattering portions 43 can be easily formed. If the width of the light-scattering portion 43 is 70% or less of the distance 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 from the observer's side. Is improved.

The ratio of the height of the light scattering portion 43 to the width of the light scattering portion 43 (the direction orthogonal to the surface direction of the image display portion 40), that is, the aspect ratio, is a projection that obliquely enters while maintaining the transmittance of straight light in the scene. Since the image light from the machine is scattered with a high gain, 1 or more is preferable, 1.5 or more is more preferable, and 2 or more is further preferable.

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

As shown in FIG. 11A, a photocurable resin 46 was applied to the surface of the first transparent film 41, and a plurality of ridges having a right-angled cross section corresponding to the light scattering portion 43 were formed on the surface. The mold 62 is placed on the photo-curable resin 46 so that the ridges contact the photo-curable resin 46.

Light (ultraviolet rays or the like) is radiated from the side of the first transparent film 41 to cure the photocurable resin 46, thereby forming a transparent layer lower 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.

As shown in FIG. 11C, a paste containing a photo-curable resin, a light-scattering material, and optionally a light-attenuating material is supplied to the surface of the transparent layer lower layer 42a, and the surplus is scraped off with a doctor blade. As a result, the paste 48 is embedded in the groove 44 of the transparent layer lower layer 42a. Light (ultraviolet rays or the like) is applied to cure the paste 48 and form the light scattering portion 43.

As shown in FIG. 11D, the photocurable resin 47 is applied to the surface of the transparent layer lower layer 42 a and the surface of the light scattering portion 43, and the second transparent film 45 is superposed on the photocurable resin 47.
By irradiating light (ultraviolet rays or the like) from the first transparent film 41 side or the second transparent film 45 side to cure the photocurable resin 47 and form the transparent layer upper layer, the image display unit 40. To get

Examples of the mold 62 include a resin film having a plurality of convex portions formed on its surface, a metal plate, and the like.
Examples of the method for 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, and more preferably 5% or more from the viewpoint of the visibility of the scene seen from the viewer side on the other side of the image display transparent member 5.

The front haze of the image display transparent member 5 is preferably 4% or more, more preferably 5% or more, and further preferably 8% or more, from the viewpoint of securing a screen gain and a viewing angle.
The forward 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 preferable.

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 further 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 view seen from the viewer side on the other side of the image display transparent member 5 is seen in multiples. It is preferable that the transparent layer 42 and the light scattering portion 43 have the same refractive index from the viewpoint of suppressing rainbow unevenness and spectral dispersion of the scene.

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 preferably as small as possible. The difference between the refractive index of the transparent film and the refractive index of the transparent layer 42 is preferably 0.1 or less, more preferably 0.05 or less, further preferably 0.01 or less, and particularly preferably 0.001 or less.

(Video display system with transparent image display transparent member)
A second aspect of the video display system of the present invention is a video display system including the transmissive video display transparent member of the present invention and a projector installed on the first surface side of the video display transparent member. ..

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

The projector 200 may be any one that can project the image light L on the image display transparent member 5. The projector 200 may be a known projector or the like.

(Transmissive image display method using a transparent member)
According to a second aspect of the image display method of the present invention, image light is projected on 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 to be displayed.

As shown in FIG. 10, the image light L projected from the projector 200 and incident from the surface (first surface A) on the first transparent base material 10 side of the image display transparent member 5 is reflected by the light scattering section 43. An image is formed by being scattered, and is visually displayed as an image for an observer Y on the opposite side of the projector 200.
Further, since the space between the light scattering portions 43 in the image display transparent member 5 transmits light, the scene on the first surface A side can be visually transmitted to the observer Y on the second surface B side, and The view on the side of the second surface B can be visibly transmitted to the observer X on the side of the first surface A.

(Mechanism of action)
In the transparent image display transparent member 5 and the image display system and the 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 is outdoors. In this case, a part of the scattered light, which is the straight light from the scene (indoor) that is incident on the image display transparent member 5 from the first surface A side and scattered by the light scattering portion 43, is the second transparent substrate that is the light attenuation layer. It is absorbed by the material 20 and decreases. As a result, when the observer Y views 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. Further, the sunlight L1 that has entered the image display transparent member 5 from the second surface B side is scattered by the light scattering portion 43, and a part of the reflected scattered light is the second transparent base material 20 which is the light attenuation layer. It is absorbed by and decreases. As a result, when an observer on the A side of the first surface views a scene (outdoor) on the other side of the image display transparent member 5, the contrast of 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 when viewed 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 scattered light, which is the image light projected from the projector 200 and scattered by the light scattering section 43, is attenuated by the second transparent base material 20 which is the light attenuation layer, so that the light attenuation is achieved. The image gain is reduced as compared with the case where 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 dependency is used for the second transparent base material 20, by aligning the direction of high transmittance of the material having polarization dependency in the same direction as the main polarization direction of the projection light L, The visibility of the observer Y can be enhanced by increasing the transmittance of the scene on the other side while suppressing the decrease in gain.

(Other embodiments)
The transmissive image display transparent member of the present invention has a first surface and a second surface opposite to the first surface, so that a scene on the first surface can be viewed by an observer on the second surface. It is 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 observed on the second surface side. The image display transparent member visibly displayed as an image on the image display transparent member, as long as the image display transparent member has a light attenuating layer for attenuating a part of the light transmitted through the image display transparent member. The image display transparent member 5 of 10 is not limited. Hereinafter, the same components as those of the image display transparent member 5 of FIG. 10 are designated by 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. Specific examples of the image display transparent member 6 include 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 unit 40 is attached to the existing window glass or the like. ..
Further, in a double-layer glass having two glass plates and a frame-shaped spacer which is interveningly arranged at the peripheral edge of the glass plates so that a gap is formed between the glass plates, one of the glass plates is a colored glass plate. The image display unit 40 may be attached to the inner surface of one of the glass plates.

As shown in FIG. 13, the transmissive image-displaying transparent member of the present invention contains a light-attenuating component instead of the first transparent base material 10 and is colored so that a part of the light transmitted through the transparent member is partially colored. An image having a first transparent base material 10A which is a light attenuating layer to be attenuated and, instead of the second transparent base material 20, a second transparent base material 20A which is not mixed with a light attenuating component and is not colored. 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 is outdoor, from the scene (outdoor) incident on the image display transparent member 5A from the second surface B side. Part of the scattered light obtained by scattering the straight traveling light of (3) by the light scattering portion 43 is absorbed by the second transparent base material 20 which is the light attenuation layer and reduced. As a result, when the observer Y views 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 5 is improved. Therefore, the visibility of the scene is excellent. Further, a 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 section 43 is the first transparent base material 10A which is the light attenuation layer. Attenuated and reduced. As a result, when an observer on the first surface A side views a scene (outdoor) on the other side of the image display transparent member 5A, the contrast of light transmitted from the other side of the image display transparent member 5A is improved. Therefore, as viewed by the observer on the first surface A side, the contrast of the scene on the other side of the image display transparent member 5A is improved, and the visibility of the scene at night is excellent.
When a material having polarization dependency is used for the first transparent base material 10A, by aligning the direction of high transmittance of the material having polarization dependency in the same direction as the main polarization direction of the projection light L, The visibility of the observer X can be improved by increasing the transmittance of the scene on the other side while suppressing the decrease in gain.

As shown in FIG. 14, the transmissive image display transparent member of the present invention includes a first transparent base material 10 and a second transparent base material 20A which are not colored with a light attenuation component and are not colored. A light-attenuating layer 50, which is mixed with a light-attenuating component and is colored, is provided on the surface of the second transparent base material 20A on the side opposite to the image display unit 40, and attenuates a part of the light passing through the transparent member. The image display transparent member 7 may be used. 20 A of 2nd transparent base materials and the light attenuation layer 50 are adhere|attached by the adhesive layer 52.
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.
Similar to the image display transparent member 5, the image display transparent member 7 improves the contrast of the scene on the other side of the image display transparent member 7 as seen by the viewer on the second surface B side, and improves the visibility of the scene. Excel.

As shown in FIG. 15, the transmissive image display transparent member of the present invention does not include the first transparent base material 10 and the second transparent base material 20, and the second transparent film 45 of the image display part 40 is provided. The image display transparent member 8A having the light attenuating layer 50 disposed on the surface may be used. Similar to the image display transparent member 5, the image display transparent member 8A improves the contrast of the scene on the other side of the image display transparent member 8A when viewed from the observer on the second surface B side, and improves the visibility of the scene. Excel.
In addition, as shown in FIG. 16, an image in which 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 unit 40. It may be the display transparent member 8B. Similar to the image display transparent member 5A, the image display transparent member 8B improves the contrast of the scene on the other side of the image display transparent member 8B when viewed from the observer on the first surface A side, and improves the visibility of the scene. Excel.

The image display transparent members 8A and 8B can be attached to an existing window glass or the like by using an adhesive layer. 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.
Further, the image display transparent members 8A and 8B in FIGS. 15 and 16 may have image display portions in which the first transparent film 41 and the second transparent film 45 are replaced with transparent base materials.

As shown in FIG. 17, the transmissive image display transparent member of the present invention is an image display having a first transparent base material 10A and a second transparent base material 20 which are both colored with a light attenuation component. It may be the transparent member 5B.
For the same reason as the image display transparent member 5, the image display transparent member 5B improves the contrast of the scene on the other side of the image display transparent member 5B when viewed from the observer on the second surface B side, and visually recognizes the scene. Excellent in performance.

As shown in FIG. 18, the reflection type 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 a light attenuation component and are not colored. The image display transparent member 5C having the image display section 40A which is a light attenuation layer which is colored by mixing the second transparent film 45A with a light attenuation component and is colored to attenuate a part of the light transmitted through the transparent member. May be.
For the same reason as the image display transparent member 5, the image display transparent member 5C improves the contrast of the scene on the other side of the image display transparent member 5C when viewed from the observer on the second surface B side, and visually recognizes the scene. Excellent in performance.

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-attenuating component to be colored, and light-attenuating for attenuating a part of light transmitted through the transparent member. It may be a layered image display transparent member. In addition, a transparent image display, which is a light-attenuating layer in which a light-attenuating component is mixed and colored in both the first transparent film 41 and the second transparent film 45 to attenuate part of the light transmitted through the transparent member. It may be a member.
Further, the transmissive image display transparent member of the present invention has, in the image display transparent member 5, a second transparent base material 20A in which a light attenuation component is not mixed, instead of the second transparent base material 20. The image display transparent member is a light attenuating layer that is colored by mixing a light attenuating component into one or both of the adhesive layer 12 and the adhesive layer 22, and attenuates a part of light transmitted through the transparent member. May be.
Examples of the light-attenuating component mixed in the transparent film or the adhesive layer of the image display unit include the same as those listed for the light-attenuating layer 50.

Since the function of the member serving as the light attenuating layer is only to have the function of reducing the transmittance, a half mirror may be used as the light attenuating 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 unit 43 and the projector, in addition to the above-described effect, a function as a magic mirror can be added, which makes it difficult for an observer to recognize a front image dropout. Will be able to. Further, by arranging the light scattering portion 43 at a portion not between the projector and the projector, it is possible to project on both sides.
As the aspect of the light attenuation layer in the transmissive image display transparent member of the present invention, as described above, the second transparent base material 20 of FIGS. 10 and 12, the first transparent base material 10A of FIG. 13, and the transparent base material 10A of FIG. To the transparent substrate and transparent film as exemplified in the colored transparent film of FIG. 16, the first transparent substrate 10A and the second transparent substrate 20 in FIG. 17, and a half mirror.

In the transmissive image display transparent member of the present invention, the shape of the cross section orthogonal to the longitudinal direction of the light scattering portion 43 is not limited to the right-angled triangle as in the illustrated example, but may be another triangle, trapezoid, bell shape or the like. It may be.
Other examples of the light-scattering sheet for the image display unit include those that are transmitted, deflected, and diffused by a volume hologram; those that are deflected, scattered, and diffused by a kinoform hologram or other structure having an uneven surface. Are listed.

Further, as the light-scattering sheet of the image display section, without providing a plurality of light-scattering sections as shown in the transparent layer, the light-scattering fine particles are dispersed in the entire transparent layer to form the transparent layer itself as a light-scattering layer. It may be the one.
Examples of the light-scattering fine particles include fine particles of a high refractive index material such as titanium oxide, zirconium oxide, and aluminum oxide described above; and fine particles of a low refractive index material 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. The average particle diameter of the light-scattering fine particles is preferably 50 to 1000 nm, more preferably 100 to 800 nm, for the reason described above.
The light scattering layer may include a light attenuating material for the reasons mentioned above. The concentration of the light attenuating material is preferably 0.01 to 5% by volume, more preferably 0.1 to 3% by volume.

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited to 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 (Ogassol (manufactured by Osaka Gas Chemical Co., Ltd., A solution prepared by mixing 3 parts by mass of a photoinitiator (manufactured by BASF, Irgacure (registered trademark) 907) with 100 parts by mass of (registered trademark) EA-F5003) was applied to a thickness of 10 μm by a die coating method.
A white PET film (E20 manufactured by Toray Co., arithmetic average roughness Ra: 0.23 μm) having an irregular uneven structure formed on the surface thereof is placed on the ultraviolet curable resin so that the uneven structure is in contact with the ultraviolet curable resin. Layered on.

The transparent PET film is irradiated with 1000 mJ of ultraviolet light to cure the ultraviolet curable resin to form the first transparent layer having the irregular concavo-convex structure of the white PET film transferred to the surface thereof, and then the white PET film. Was peeled off.
On the surface of the first transparent layer, aluminum was physically vapor-deposited by a vacuum vapor deposition method to form a reflective film made of an aluminum thin film (thickness: 8 nm).

On the surface of the reflective film, 3 parts by mass of a photoinitiator (manufactured by BASF, Irgacure (registered trademark) 907) with respect to 100 parts by mass of an ultraviolet curable resin (manufactured by Osaka Gas Chemicals, Inc., Ogsol (registered trademark) EA-F5003) The partially 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 overlaid on the ultraviolet curable resin.
By irradiating with 1000 mJ of ultraviolet rays to cure the ultraviolet curable resin and forming the second transparent layer, the image display section of Example 1 including the light scattering sheet was obtained.

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 vacuum thermocompression bonding was performed 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 (made by Asahi Glass Co., Ltd., <trade name> Mai Vale, thickness: 3 mm, x=0.3069, y=0 in the xyY color system, as the second transparent substrate. .3126, Y=28.54) to obtain a reflective image-displaying transparent member of Example 2. Table 1 shows the evaluation results of the image display transparent member of Example 2.

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

Ultraviolet rays are irradiated from the side of the transparent PET film to cure the ultraviolet curable resin to form a transparent layer lower layer (thickness: 10 μm) on the surface of which grooves corresponding to the ridges of the mold are formed, and then the mold is formed. Peeled off. As a result, a plurality of grooves having a space 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 transparent layer lower layer in the area of 100 mm×100 mm.

Ultraviolet curable resin (Hitaroid (registered trademark) 7981, specific gravity 1.1, manufactured by Hitachi Chemical Co., Ltd.), and titanium oxide fine particles (average particle diameter: 0.2 μm, specific gravity 4.2) to be 0.1% by volume. A paste mixed with was prepared.
The paste was supplied to the surface of the lower layer of the transparent layer and the surplus was scraped off with a doctor blade to embed the paste in the groove of the lower layer of the transparent layer. The light scattering part was formed by irradiating with ultraviolet rays and hardening the paste.

An ultraviolet curable resin (Hitaroid (registered trademark) 7981, specific gravity 1.1) manufactured by Hitachi Chemical Co., Ltd. is applied to the surface of the lower layer of the transparent layer and the surface of the light scattering portion by 5 μm by a die coating method to be transparent on the ultraviolet curable resin. PET films were overlaid.
By irradiating with ultraviolet rays and curing the ultraviolet curable resin to form the upper layer of the transparent layer, an image display section of Example 3 including a light scattering sheet was obtained.

Soda lime glass plate (Matsunami glass, thickness: 3 mm), PVB film (Saflex (registered trademark) RK11l, thickness: 375 μm), image display part of Example 3, PVB film (thickness: 375 μm) , A soda lime glass plate (thickness: 3 mm) were laminated in this order, and vacuum thermocompression bonding was performed to obtain a transparent 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, a transparent glass image display transparent of Example 4 was used by using a colored glass (made by Asahi Glass Co., Ltd., <brand name> Myvale, similar to Example 2) as the second transparent substrate. The member was obtained. Table 1 shows the evaluation results of the image display transparent member of Example 4.

The evaluation criteria in the table are as follows.
(Scene visibility)
During the daytime, the image display transparent member is installed outdoors 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 from the observer on the second surface side is The following criteria were evaluated.
0: Good.
1: Good when the foreground is dark or external light is small.
2: It is a level at which rough recognition is possible.
3: The sight cannot be seen.

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

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

The image display transparent member of the present invention is used for showcases of products and the like; display cases for works of art, animals and the like; windows of buildings, showrooms, vehicles and the like; glass doors; transparent partitions in the room; exterior walls of buildings; It is useful as a transparent member used. Specifically, the scene seen from the side of the transparent member can be visually recognized from the observer's side, and information such as description of products, state of various devices, destination guidance, message to be transmitted, etc. is transmitted to the observer. At the time of displaying the operation screens of various devices to the observer, or when obscuring the sight of the other side of the transparent member to the observer for privacy protection, security, etc. It is useful as a so-called transparent screen for visually displaying the image light projected from the viewer as an image.
Further, it is useful as a transparent screen or a head-up display when used as a window glass for transportation means such as vehicles and aircraft.
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 the disclosure of the specification of the present invention, It is something to incorporate.

1-3, 5-7, 1A-1C, 4A, 4B, 5A-5C, 8A, 8B: image display transparent member, 10: first transparent substrate, 10A: first transparent substrate (light attenuating layer) ), 12: adhesive layer, 20: second transparent base material (light attenuation layer), 20A: second transparent base material, 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 attenuating layer), 36: photocurable resin, 37: photocurable resin, 40, 40A: image display part, 41: first transparent film, 42: transparent layer, 42a: lower layer of transparent layer, 43: light scattering part, 44: groove, 45: second transparent Film, 45A: Second transparent film (light attenuating layer), 46: Photocurable resin, 47: Photocurable resin, 48: Paste, 50: Light attenuating layer, 52: Adhesive layer, 61: Mold, 62: Mold, 101: transparent member for image display, 102: transparent member for image display, 110: first transparent base material, 120: second transparent base material, 132: first transparent layer, 133: reflective film, 134: first 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 side opposite to the first surface, and transmits the scene on the first surface side so that it can be visually recognized by an observer on the second surface side. The image light that is visibly transmitted to the observer on the first surface side and that is projected from the projector installed on the first surface side is visually displayed as an image to the observer on the first surface side. A reflective image display transparent member that
Between the first surface and the second surface,
A first transparent layer having an uneven structure on its surface;
A reflective film formed along the surface of the concavo-convex structure of the first transparent layer and transmitting a part of incident light ;
A second transparent layer provided so as to cover the surface of the reflective film,
An image display unit having
A first transparent base material is provided on the first surface side of the video display unit, and a second transparent base material is provided on the second surface side of the video display unit,
At least a second transparent base material of the transparent base material is a light attenuation layer in which a light attenuation component is mixed with glass or a transparent resin, and a part of light transmitted through the image display transparent member is attenuated. The image display transparent member. The front haze of the image display transparent member is 20% or less,
The rear haze of the image display transparent member is 5% or more,
The ratio of the rear Haze (rear Haze / front haze) is 1 or more, the image display transparent member according to claim 1 for the front haze. The image display transparent member according to claim 1, wherein the uneven structure on the surface of the first transparent layer is an irregular uneven structure. With a polarization dependence to the light attenuating layer, the image display transparent member according to any one of claims 1-3. The transmittance of the light attenuating layer is 70% or less, the image display transparent member according to any one of claims 1-4. Wherein the light attenuating layer (in over the entire visible light uniformly (xyY color system, 0.25 ≦ x ≦ 0.4,0.25 ≦ y ≦ 0.4)) Gray is, claim 1-5 The image display transparent member according to any one of 1. (In the xyY color system, x ≦ 0.33, y ≦ 0.5 ) wherein the light attenuating layer is bluish are tinged with the video display transparent member according to any one of claims 1-5. (In the xyY color system, y> x, 0.33 ≦ y ) wherein the light attenuating layer is greenish are tinged with the video display transparent member according to any one of claims 1-5. Area of the light attenuating layer is either same as the area of the video display unit, or greater than the area of the video display unit, the video display transparent member according to any one of claims 1-8. A video 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,
Video display system equipped with. The image display transparent member according to any one of claims 1 to 9 ,
A video display method in which video light is projected from a projector installed on the first surface side of the video display transparent member to display a video.

Images