JP6508205B2 - Image display transparent member, image display system and image display method - Google Patents

Description

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

The followings have been proposed as transparent members used for display cases of products etc .; display cases of art objects etc .; windows of buildings, showrooms, vehicles etc .; glass doors; indoor transparent partitions etc.
It is possible to see the sight seen from the observer side on the other side of the transparent member and also to inform the observer of information such as the description of goods etc., the state of various devices, destination guidance, transmission matters etc. to the observer. The image projected from the projector when displaying the operation screen of various devices or when making it impossible for the observer to see the view on the other side of the transparent member for privacy protection, security, etc. An image display transparent member (so-called transparent screen) that displays light in a visible manner as an image to an observer.

  The image display transparent member is a reflective image display transparent member for displaying image light projected from the projector so as to be visible as an image to an observer who is on the same side as the projector; image light projected from the projector And a transmissive image display transparent member that displays the image as visible to an observer on the opposite side of the projector. However, the conventional image display transparent member has low transparency (high haze) and poor visibility of the scene.

  As a reflection type image display transparent member, for example, as shown in FIG. 19, a regular uneven structure (micro lens on the surface between the first transparent base 110 and the second transparent base 120) A first transparent layer 132 on which the array is formed, 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; There has been proposed an image display transparent member 101 having a second transparent layer 134 provided to cover the surface of 133 (see Patent Document 1).

In the reflective image display transparent member 101, as shown in FIG. 19, the image light L projected from the projector 200 and incident from the surface (first surface A) on the second transparent base 120 side is The light is imaged by being scattered by the reflective film 133, and is displayed so as to be visible as an image to an observer X who is 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 image screen gain.
In addition, even from the observer X on the same side as the projector 200 and the observer Y on the opposite side to the projector 200, the view on the other side of the image display transparent member 101 can be viewed from the observer side.

However, in the reflection type image display transparent member 101, there is a problem that the visibility of the view on the other side of the image display transparent member 101 is reduced when viewed from the observer. Specifically, the other side of the image display transparent member 101 is the reflected and scattered light in which the light of the sun and the illumination incident on the image display transparent member 101 from the viewer side trying to see the view on the other side is scattered by the reflective film 133. The contrast of the light transmitted from the image display transparent member 101 is reduced, and the visibility of the view on the other side of the image display transparent member 101 is reduced.
For example, when the reflective image display transparent member 101 is used as a window, the window looks white and blurred to the observer Y who is out of the window due to reflected and scattered light in which sunlight L1 is scattered by the reflective film 133 in the daytime. , The visibility of the view inside the window is reduced. Also, in this case, due to the reflected and scattered light in which the light L2 of illumination is scattered by the reflective film 133 in the night, the window looks white blurred to the observer X who is in the room, and the visibility of the scene outside the window is reduced.

  As the transmissive image display transparent member, for example, as shown in FIG. 20, the transparent layer 142 and the inside of the transparent layer 142 between the first transparent substrate 110 and the second transparent substrate 120. There is proposed an image display transparent member 102 having a plurality of light scattering portions 143 extending along the surface direction and arranged in parallel to each other at predetermined intervals (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 The light is scattered by the light scattering portion 143, and is imaged so as to be visible as an image to the observer Y on the opposite side of the projector 200.
In addition, even from the viewer X on the same side as the projector 200 and the viewer Y on the opposite side to the projector 200, the view on the other side of the image display transparent member 102 can be viewed from the viewer side.

  However, in the transparent type image display transparent member 102, as in the case of the reflective type image display transparent member 101, there is a problem that the visibility of the view on the other side of the image display transparent member 102 is degraded as seen from the observer. is there. Specifically, when the observer tries to look at the view on the other side, straight light coming from the view on the other side is scattered when passing through the light scattering portion 143, and the observer observes the scattered light. And the resolution of the scene falls. For example, the visibility of characters etc. is greatly reduced. Moreover, the light of the sun and illumination which entered into the image display transparent member 102 from the observer side who was going to see the scene on the other side transmitted from the other side of the image display transparent member 102 by the reflected scattered light scattered by the light scattering portion 143 The contrast of the incoming light is reduced, and the visibility of the view beyond the image display transparent member 102 is reduced. Therefore, for example, when the transparent image display transparent member 102 is used for a window, the visibility of the inside of the window is reduced for the observer Y who is outside the window due to reflected and scattered light by the sunlight L1 during the day At night, the reflected and scattered light from the light L2 of illumination reduces the visibility of the view outside the window from the observer X who is in the room.

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

  The present invention provides an image display transparent member having an increased resolution of the view on the other side of the transparent member as viewed from the observer and excellent in visibility, and an image display system and an image display method using the same.

The present invention has the following configuration.
[1] It has a first surface and a second surface opposite to this, and transmits the view on the first surface visibly to the observer on the second surface, and the second surface The image light projected from the projector installed on the first surface side is transmitted to the viewer on the first surface side in a visible manner to the viewer on the first surface side and the second It is a video display transparent member that is displayed visibly as a video on any one of the viewers on the surface side,
The image display transparent member has a light attenuating layer for attenuating a part of light transmitted through the image display transparent member.
[2] The image display transparent member of [1], wherein the light attenuation layer has polarization dependency.
[3] The image display transparent member of [1] or [2], wherein the transmittance of the light attenuation layer is 70% or less.
[4] The light attenuating 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 xy Y color system)) [1 ] The image display transparent member in any one of-[3].
[5] The image display transparent member according to any one of [1] to [3], wherein the light attenuation layer is bluish (x to 0.33, y to 0.5 in the xyY color system).
[6] The image display transparent member according to any one of [1] to [3], wherein the light attenuating layer is greenish (y> x, 0.33 to y in the xyY color system).
[7] The image display transparent member according to any one of [1] to [3], wherein the light attenuation layer is a half mirror.
[8] The image display transparent member according to any one of [1] to [7], wherein the front haze is 50% or less.
[9] A reflection type that displays image light projected from the first surface side to an observer on the first surface side so as to be visible as an image,
Forward haze is less than 20%,
Back haze is more than 5%,
The image display transparent member according to any one of [1] to [8], wherein a ratio of rear haze to front haze (rear haze / forward haze) is 1 or more.
[10] A reflection type that displays image light projected from the first surface side to an observer on the first surface side so as to be visible as an image,
Between the first side and the second side,
A first transparent layer having an uneven structure on the surface,
A reflective film formed along a surface of the first transparent layer on the side of the concavo-convex structure, which transmits a part of incident light;
A second transparent layer provided to cover the surface of the reflective film,
The image display transparent member in any one of [1]-[9] which has an image display part which has these.
[11] The image display transparent member of [10], wherein the concavo-convex structure of the surface of the first transparent layer is an irregular concavo-convex structure.
[12] The image display transparent member of [10] or [11], wherein the area of the light attenuation layer is the same as the area of the image display unit or larger than the area of the image display unit.
[13] The image display transparent member is of a transmissive type that displays the image light projected from the first surface side visibly as an image to an observer on the second surface side,
The image display transparent member in any one of [1]-[8] whose front haze is 4 to 40%.
[14] The image display transparent member is of a transmissive type that displays the image light projected from the first surface side visibly as an image to an observer on the second surface side,
Between the first side and the second side,
With a transparent layer,
A plurality of light scattering portions extending in a plane direction, disposed parallel to each other and at predetermined intervals inside the transparent layer;
The image display transparent member according to any one of [1] to [8] or [13].
[15] The image display transparent member according to any one of the above [1] to [14],
A projector installed on the first surface side of the image display transparent member;
, An image display system.
[16] The image display transparent member according to any one of the above [1] to [14],
A video display method, wherein video light is projected from a projector installed on the first surface side of the video display transparent member to display a video.

  According to the image display transparent member, the image display system, and the image display method of the present invention, the resolution of the view on the other side of the transparent member as viewed from the observer is enhanced, and the visibility becomes excellent.

They are a schematic block diagram which shows an example of the video display system of this invention, and a layer block diagram which shows an example of the reflection type video display transparent member of this 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. They are a schematic block diagram which shows the other example of the video display system of this invention, and a layer block diagram which shows an example of the transmissive | pervious image display transparent member of this invention. It is sectional drawing which shows an example of the manufacturing process of the transmissive | pervious image display transparent member of this invention. It is a layer block diagram which shows the other example of the transmissive | pervious image display transparent member of this invention. It is a layer block diagram which shows the other example of the transmissive | pervious image display transparent member of this invention. It is a layer block diagram which shows the other example of the transmissive | pervious image display transparent member of this invention. It is a layer block diagram which shows the other example of the transmissive | pervious image display transparent member of this invention. It is a layer block diagram which shows the other example of the transmissive | pervious image display transparent member of this invention. It is a layer block diagram which shows the other example of the transmissive | pervious image display transparent member of this invention. It is a layer block diagram which shows the other example of the transmissive | pervious image display transparent member of this invention. It is a layer block diagram which shows an example of the conventional video display transparent member of a reflection type. It is a layer block diagram which shows an example of the conventional transmissive | pervious image display transparent member.

The following definitions of terms apply throughout the specification and claims.
The “first surface” is the outermost surface of the image display transparent member, and means the surface on which the image light is projected from the projector.
The “second surface” means the outermost surface of the image display transparent member and the surface opposite to the first surface.
The “view on the first surface side (second surface side)” refers to the view on the second surface side (first surface side) of the image display transparent member as viewed from the observer on the second surface side (the first surface side). It means an image (major objects (goods, works of art, people, etc.) and their background, scenery, etc.) seen on the side. The view does not include an image displayed by image light projected from the projector on the image display transparent member and displayed.
The “forward haze” refers to incident light by forward scattering among transmitted light transmitted from the first surface side to the second surface or transmitted light transmitted from the second surface to the first surface. Mean the percentage of transmitted light that deviates by more than 0.044 rad (2.5 °). That is, it is a normal haze measured by the method described in JIS K 7136: 2000 (ISO 14782: 1999).
"Backward haze" means the percentage of the reflected light that deviates by 0.044 rad (2.5 °) or more from the specularly reflected light, from the reflected light that is reflected on the first surface.
The “concave and convex structure” means a concavo-convex shape including a plurality of protrusions, a plurality of recesses, or a plurality of protrusions and recesses.
The "irregular uneven structure" means an uneven structure in which the projections or recesses do not appear periodically and the sizes of the projections or recesses are uneven.
Arithmetic mean roughness (Ra) is an arithmetic mean roughness measured based on JIS B 0601: 2013 (ISO 4287: 1997, Amd. 1: 2009). The reference length lr (cutoff value λc) for the roughness curve was 0.8 mm.
The transmittance is 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 light 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 d-line (wavelength 589 nm) of a sodium lamp.

<Reflective-type image display transparent member>
The 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, and provides the viewer of the first surface with a viewer on the second surface. The viewer transmits the visible light and transmits the view on the second surface in a visible manner to the viewer on the first surface and the video light projected from the first surface on the first surface A transparent image display transparent member having a light attenuating layer for attenuating part of light passing through the image display transparent member. It is a member.

FIG. 1 is a layer configuration diagram showing an example of the reflective image display transparent member of the present invention.
In the image display transparent member 1, the image display unit 30 is disposed between the first transparent base material 10 and the second transparent base material 20, and the light attenuation component is compounded in the second transparent base material 20. And is a light attenuating layer for attenuating part of the light passing through the image display transparent member 1.
The first transparent substrate 10 and the image display unit 30 are adhered by the adhesive layer 12, and the second transparent substrate 20 and the image display unit 30 are adhered by the adhesive layer 22.

(First transparent base material)
Examples of the material of the first transparent base material 10 include glass, transparent resin and the like.
As glass which comprises a transparent base material, soda lime glass, alkali free glass, borosilicate glass, aluminosilicate glass etc. are mentioned. The first transparent substrate 10 made of glass may be provided with chemical strengthening, physical strengthening, hard coating, etc. in order to improve the durability.

  The transparent resin constituting the first transparent substrate 10 includes polycarbonate, polyester (polyethylene terephthalate, polyethylene naphthalate etc.), triacetyl cellulose, cycloolefin polymer, polymethyl methacrylate etc. From the viewpoint, polycarbonates, polyesters and cycloolefin polymers are preferred.

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

(Second transparent substrate (light attenuating layer))
The second transparent base 20 is blended with a light attenuating component and colored, and also serves as a light attenuating layer for attenuating part of the light transmitted through the image display transparent member 1.
In the image display transparent member 1, when the second transparent base 20 is the light attenuating layer, when the observer Y looks at the view on the other side of the image display transparent member 1, the visibility of the view is improved. It will be excellent.

Examples of the material of the second transparent base material 20 include a glass, a transparent resin, and the like mentioned as the material of the first transparent base material 10 in which a light attenuating component is blended.
As a light attenuating component contained in glass, for example, 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 , Metal oxides such as MnO ₂ and SeO _x can be mentioned, and it is preferable that Fe and Cu be contained from the viewpoint of imparting functions such as cutting of 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 an azine compound. From the viewpoint of weather resistance, pigments are preferable.

Also, the second transparent substrate 20 may have polarization dependence. For example, among light amounts included in the image light L from the projector, the polarization direction of many lights is aligned with the polarization direction of the side to which the second transparent base material 20 is attenuated more. Thereby, the image light L can be efficiently absorbed while having high transmittance, and the visibility of the view of the observer Y can be improved.
Examples of light attenuation components having polarization dependence include dichroic dyes and metal nanorods. The second transparent substrate having polarization dependence can also be prepared by stretching a transparent resin containing iodine, a dye, silver or the like. In addition, a wire grid structure may be formed on the surface of the second transparent substrate 20 to provide polarization dependency. As for the polarization dependency, if the ratio of the transmittance is 2 or more, the difference with the light attenuating material having no polarization dependency is preferably perceived as the brightness of the scene, and is more preferably 5 or more. And 10 or more are particularly preferable.

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

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

  The color of the second transparent base material 20 of the light attenuating layer is preferably bluish because this improves the visibility of the scene. As a preferable range, it is preferable in xyY color system that it is x-0.33 and y-0.5.

  When the second transparent base material 20 of the light attenuating layer is greenish, the transmittance of the region with high visibility can be secured even when privacy glass is used to reduce the amount of transmitted light. Therefore, it is possible to obtain a balance between the efficacy and the view by efficiently cutting visible light, infrared light and ultraviolet light. As a preferable range, in the xyY color system, y> x and 0.33 to y are preferable.

  In the present invention, as shown in FIG. 1, the area of the second transparent base material 20 as the light attenuating layer is the same as the area of the image display unit 30, or the area of the second transparent base material 20 as the light attenuating layer is Preferably, the area is larger than the area of the image display unit 30. As a result, part of the light (sunlight, etc.) incident from the viewer Y side, which is scattered by the reflection film described later, is stably absorbed by the light attenuating layer. Therefore, a drop in the contrast of the view on the other side of the image display transparent member as viewed from the observer Y is stably suppressed, and excellent visibility of the view on the other side of the image display transparent member 1 is easily realized stably. Become.

As the second transparent base material 20, one having no birefringence is preferable.
The thickness of the second transparent substrate 20 may be a thickness that can maintain the durability as the substrate. The thickness of the transparent substrate may be, for example, 0.01 mm or more, may be 0.05 mm or more, and may be 0.1 mm or more. The thickness of the transparent substrate may be, for example, 10 mm or less, 5 mm or less, 0.5 mm or less, 0.3 mm or less, 0.15 mm or less. You may

(Adhesive layer)
As materials for the adhesive layer 12 and the adhesive layer 22 (hereinafter collectively referred to as adhesive layer), ethylene-vinyl acetate copolymer, polyvinyl butyral, adhesive (acrylic adhesive, etc.), photocurable resin composition And thermoplastic resin compositions. 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 any thickness as long as the function as the adhesive layer can be maintained, for example, preferably 0.01 to 1.5 mm, and more preferably 0.05 to 1 mm.

(Video display unit)
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 having an irregular uneven structure on the surface; and a first transparent layer 32 A reflective film 33 formed along the surface on the side of the concavo-convex structure of the second embodiment; a second transparent layer 34 provided to cover the surface of the reflective film 33; And a second transparent film 35 provided on the surface of the transparent layer 34.

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

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

  The thickness of the transparent film is preferably a thickness to which a roll-to-roll process can be applied, for example, preferably 0.01 to 0.5 mm, more preferably 0.05 to 0.3 mm, and still more preferably 0.2 mm or less.

(Transparent layer)
The first transparent layer 32 and the second transparent layer 34 (hereinafter 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 is preferably the same.

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

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

  0.01-20 micrometers is preferable and, as for arithmetic mean roughness Ra of the irregular uneven structure formed in the surface of the 1st transparent layer 32, 0.05-10 micrometers is more preferable. If the arithmetic mean roughness Ra is within the above range, the viewing angle of the projected image is wide, so that the specular reflection light can be visually recognized without direct viewing, and the graininess due to the concavo-convex structure can be suppressed. If arithmetic mean roughness Ra is 10 micrometers or less, when seeing the sight on the other side of image display transparent member 1, concavo-convex structure does not become a hindrance and it is more preferred.

(Reflective film)
The reflective film 33 may transmit part of the light incident on the reflective film 33 and reflect the other part. As the reflective film 33, a metal film, a semiconductor film, a dielectric single layer film, a dielectric multilayer film, a combination of these, and the like can be mentioned.

As a metal which comprises a metal film and a semiconductor film, Al, Ag, Ni, Cr, W, Si etc. can be considered, Especially Al, Ag, or the alloy which has them as a main component is preferable.
Examples of the dielectric constituting the dielectric film include metal oxides and metal nitrides.
The reflective film 33 preferably has a metal thin film, or a film configuration in which an oxide film, a metal thin film, and an oxide film are sequentially stacked.

The thickness of the reflective film 33 is preferably 1 to 100 nm from the viewpoint that it can be used without disturbing the function due to the arithmetic average roughness Ra of the irregular concavo-convex structure formed on the surface of the first transparent layer 32. 4 to 25 nm is more preferable.
The arithmetic average roughness Ra of the irregular asperity structure of the reflective film 33 is preferably 0.01 to 20 μm for the same reason as the first transparent layer 32, and more preferably 0.05 to 10 μm.
The reflectance of the reflective film 33 is preferably 5% or more, more preferably 15% or more, and still more preferably 30% or more as a range in which sufficient screen gain can be obtained.

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

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

  Light (ultraviolet light, etc.) is irradiated from the side of the first transparent film 31 to cure the photocurable resin 36 to form the first transparent layer 32 on the surface of which the irregular asperity structure of the mold 61 is transferred. Then, as shown in FIG. 2 (b), the mold 61 is peeled off.

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

As shown in FIG. 2D, a photocurable resin 37 is applied to the surface of the reflective film 33, and a second transparent film 35 is superimposed on the photocurable resin 37.
By irradiating light (ultraviolet light etc.) from the side of the first transparent film 31 or the side of the second transparent film 35 to cure the photocurable resin 37 to form the second transparent layer 34, an image can be obtained. The display unit 30 is obtained.

As the mold 61, a resin film, a metal plate or the like having an irregular uneven structure formed on the surface may be mentioned. As a resin film in which the irregular uneven structure was formed in the surface, the resin film containing microparticles | fine-particles, the resin film sandblasted, etc. are mentioned.
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, a spray coating method and the like.
As a physical vapor deposition method, a vacuum vapor deposition method, a sputtering method, etc. are mentioned.

(Optical characteristics of reflective type image display transparent member)
The transmittance of the image display transparent member 1 is preferably 3% or more, more preferably 5% or more, from the viewpoint of good visibility of the sight seen from the viewer side to the other side of the image display transparent member 1. The above is more preferable.
The transmittance of the image display transparent member 1 is preferably 60% or less, more preferably 40% or less, still more preferably 30% or less, and particularly preferably 20% or less, in order to appropriately maintain 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, from the viewpoint of good visibility of the sight seen from the viewer side to the other side of the image display transparent member 1 The following are more preferable.

The rear haze of the image display transparent member 1 is preferably 5% or more in the case where the image display transparent member 1 does not include a structure such as a flat mirror or a flat half mirror for increasing regular reflectance from the viewpoint of securing screen gain. 10% or more is more preferable, and 15% or more is more preferable.
The rear haze of the image display transparent member 1 is preferably 90% or less, more preferably 80% or less, from the viewpoint of the visibility of the scene seen from the viewer side and seen on the other side of the image display transparent member 1.

  The ratio of the rear haze to the front haze (rear haze / forward haze) is preferably 0.5 or more, and more preferably 1 or more. If the rear haze / front haze is 1 or more, even if there is an environment of 100 lux or more in the range where the line of sight of the viewer looking at the image display transparent member 1 can reach, beyond the image display transparent member 1 seen from the observer side The visibility of the view seen on the side is good, 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 under an environment where ambient light is present.

  The difference in refractive index between adjacent layers in the image display transparent member 1 is preferably 0.2 or less, since the reflectance at each layer interface can be suppressed to 0.5% or less, and the reflectance at each layer interface is 0.1 It is more preferable that the ratio be 0.1 or less in terms of%.

(Video display system with reflective type video display transparent member)
A first aspect of the image display system of the present invention is an image display system provided with 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 block diagram showing an example of a video display system according to the present invention.
The video display system includes a reflective video display transparent member 1 and a projector 200 installed on the first surface A side of the video display transparent member 1.

  The projector 200 may be anything that can project the video light L on the video display transparent member 1. As the projector 200, a well-known projector etc. are mentioned.

(Image display method using reflective type image display transparent member)
According to a first aspect of the image display method of the present invention, image light is projected from the projector installed on the first surface side of the image display transparent member onto the reflective image display transparent member of the present invention to display an image It 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 base 10 side of the image display transparent member 1 is scattered by the reflective film 33. To form an image, and can be displayed as an image so as to be visible to an observer X who is on the same side as the projector 200.
In addition, since a part of the incident light is transmitted through the reflective film 33 of the image display transparent member 1, the view on the first surface A can be transmitted to the second surface B so as to be visible to the viewer Y. The view on the second surface B side can be visibly transmitted to the viewer X on the first surface A side.

(Mechanism of action)
In the reflection type image display transparent member 1 described above and the image display system and the image display method using the same, for example, the image display transparent member 1 is used as a window so that the second surface B 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 and scattered light is reflected by the second transparent base material 20 which is a light attenuating layer. Absorbed and decreased. As a result, when the observer Y views the view on the other side of the image display transparent member 1, the contrast of the light transmitted from the other side of the image display transparent member 1 is improved. Therefore, the contrast of the view on the other side of the image display transparent member 1 viewed from the observer Y is improved, and the visibility of the view in the daytime is excellent.
In addition, absorption of the reflected and scattered light by the second transparent base material 20, which is a light attenuating layer, suppresses that the image display transparent member 1 looks white and blurs when viewed from the second surface B side. Excellent in design. Therefore, the image display transparent member 1 is useful for applications such as windows having the second surface B as the outdoor side.

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

(Other embodiments)
The reflective image display transparent member of the present invention has a first surface and a second surface opposite to the first surface, and the viewer on the first surface side is an observer on the second surface side. The viewer transmits the visible light and transmits the view on the second surface in a visible manner to the viewer on the first surface and the video light projected from the first surface on the first surface The image display transparent member can be displayed visually as an image on the screen, as long as the image display transparent member has a light attenuating layer for attenuating part of the light passing through the image display transparent member. There is no limitation to the first image display transparent member 1. Hereinafter, the same components as those of the image display transparent member 1 of FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted.

The image display transparent member of the reflection type according to the present invention may be the image display transparent member 2 in which the first transparent substrate 10 is omitted as shown in FIG. A specific example of the image display transparent member 2 is, for example, 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 the existing window glass or the like. .
Further, in a multilayer glass having two glass plates and a frame-like spacer interposed at the periphery of the glass plates so that a gap is formed between the glass plates, one glass plate is a colored glass plate In addition, the image display unit 30 may be attached to the inner surface of one of the glass plates.

In the reflective image display transparent member of the present invention, as shown in FIG. 4, instead of the first transparent substrate 10, a light attenuating component is blended to be colored, and a part of the light passing through the transparent member is Image having a first transparent substrate 10A to be a light attenuating layer to be attenuated, and having a second transparent substrate 20A which is not colored and not compounded with a light attenuating component instead of the second transparent substrate 20 It may be a display transparent member 1A.
Examples of the first transparent base material 10A in which the light attenuating component is blended and colored may be the same as the second transparent base material 20 of the image display transparent member 1. Examples of the second transparent base material 20A which is not colored and not compounded with the light attenuation component may be the same as the first transparent base material 10 of the image display transparent member 1.

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

  As shown in FIG. 5, the reflective image display transparent member of the present invention has the first transparent base material 10 and the second transparent base material 20A which are not colored and do not contain any light attenuation component. A light attenuating component is compounded and colored on the surface of the second transparent base 20A opposite to the image display unit 30, and a light attenuating layer 50 for attenuating part of the light transmitted through the transparent member is disposed. The image display transparent member 3 may be used. The second transparent base 20A and the light attenuating layer 50 are bonded by an adhesive layer 52.

As the light attenuation layer 50, for example, a colored transparent film in which a light attenuation component is blended and colored may be mentioned. The colored transparent film may be a colored transparent resin film colored and blended with a light attenuating component, or a thin colored glass film colored and blended with a light attenuating component, a thin film having a large absorption coefficient It may be a material.
As transparent resin of the coloring transparent resin film which comprises the light attenuation layer 50, a polycarbonate, polyester (polyethylene terephthalate, polyethylene naphthalate etc.), a cycloolefin polymer, a polymethylmethacrylate etc. are mentioned.
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 an azine compound, and pigments are preferable from the viewpoint of weatherability.
Examples of the thin film material having a large absorption coefficient in the light attenuating layer 50 include oxides such as Cr, Mo, W, Fe, Al and Si, and carbon-based materials such as graphene and DLC.
In the case of imparting polarization dependence to the light attenuating layer 50, dichroism dyes, nanorods such as metals, etc., stretched iodine, Ag, etc., and obliquely vapor deposited absorbing thin films etc. may be mentioned.

The transmittance of the light attenuating layer 50 is preferably 3% or more, more preferably 5% or more, and 10% or more from the viewpoint of good visibility of the view 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 that the contrast of the scene on the other side of the image display transparent member 1 is high 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, still more preferably 2% or less, and particularly preferably 1% or less from the viewpoint of making it difficult to form an image with the light attenuating layer.
The adhesive layer 52 may be the same as the adhesive layer 12 and the adhesive layer 22.

  In the image display transparent member 3, the contrast of the view on the other side of the image display transparent member 3 is improved as viewed from the observer on the second surface B side for the same reason as the image display transparent member 1 Excellent in quality. Moreover, it is excellent in the visibility of the image | video by the image light projected from the projector 200 (illustration omitted) by the side of the 1st surface A seeing from the observer by the side of the 1st surface A.

As shown in FIG. 6, the reflective image display transparent member of the present invention omits the first transparent base material 10 and the second transparent base material 20, and the second transparent film 35 of the image display unit 30. It may be an image display transparent member 4A in which the light attenuation layer 50 is disposed on the surface. In the image display transparent member 4A, for the same reason as the image display transparent member 1, the contrast of the view on the other side of the image display transparent member 4A is improved as viewed from the viewer on the second surface B side. Excellent in quality. Moreover, it is excellent in the visibility of the image | video by the image light projected from the projector 200 (illustration omitted) by the side of the 1st surface A seeing from the observer by the side of the 1st surface A.
Further, as shown in FIG. 7, an image in which the light attenuating layer 50 is disposed on the surface of the first transparent film 31 of the image display unit 30 with the first transparent substrate 10 and the second transparent substrate 20 omitted. It may be the display transparent member 4B. In the image display transparent member 4B, the contrast of the view on the other side of the image display transparent member 4B is improved as viewed from the viewer on the first surface A side for the same reason as the image display transparent member 1A. Excellent in quality.

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

The reflective image display transparent member of the present invention, as shown in FIG. 8, is an image display having a first transparent base material 10A and a second transparent base material 20, both of which are colored by blending a light attenuating component. It may be the transparent member 1B.
In the image display transparent member 1B, for the same reason as the image display transparent member 1, the contrast of the view on the other side of the image display transparent member 1B is improved as viewed from the viewer on the second surface B side. Excellent in quality. Moreover, it is excellent in the visibility of the image | video by the image light projected from the projector 200 (illustration omitted) by the side of the 1st surface A seeing from the observer by the side of the 1st surface A. Further, for the same reason as the image display transparent member 1A, the contrast of the view on the other side of the image display transparent member 1B is improved as viewed from the viewer on the first surface A side, and the visibility of the view is excellent.

As shown in FIG. 9, the reflective image display transparent member of the present invention has the first transparent base material 10 and the second transparent base material 20A which are not colored and do not contain any light attenuating component. The second transparent film 35A is a video display transparent member 1C having a video display unit 30A which is colored by blending a light attenuating component and is a light attenuating layer for attenuating a part of light transmitted through the transparent member. May be
In the image display transparent member 1C, for the same reason as the image display transparent member 1, the contrast of the view on the other side of the image display transparent member 1C is improved as viewed from the viewer on the second surface B side. Excellent in quality. Moreover, it is excellent in the visibility of the image | video by the image light projected from the projector 200 (illustration omitted) by the side of the 1st surface A seeing from the observer by the side of the 1st surface A.

Further, in the image display transparent member 1C, instead of the second transparent film 35A, a light attenuation component is blended in the first transparent film 31 to be colored, and light attenuation for attenuating part of the light transmitted through the transparent member It may be an image display transparent member which is a layer. Moreover, the light attenuation component is mix | blended and colored in both the 1st transparent film 31 and the 2nd transparent film 35, and the image display transparent which is a light attenuation layer which attenuates a part of light which permeate | transmits a transparent member It may be a member.
Further, the image display transparent member of the present invention has a second transparent base 20A in which no light attenuation component is blended in the image display transparent member 1 instead of the second transparent base 20. And an image display transparent member in which a light attenuating component is blended in any one or both of the adhesive layer 12 and the adhesive layer 22 to be colored to form a light attenuating layer for attenuating a part of light transmitted through the transparent member. May be
Examples of the light attenuating component to be blended in the transparent film and the adhesive layer of the image display unit include, for example, the same ones as mentioned for the light attenuating layer 50.

A half mirror may be used as a light attenuating layer, as long as it has the function of reducing the transmittance as the function of the member forming the light attenuating layer.
The reflectance of the half mirror may be 5% or more, preferably 10% or more, and in some cases, it may be 25% or more.
By arranging a half mirror between the image display unit and the projector, in addition to the above-mentioned effects, it is possible to enable projection on both sides. In addition, since the function as a magic mirror can be added by arranging in a part not between the video display unit and the projector, it is possible to make it difficult for the viewer to recognize a video drop to the rear. Become.
As an aspect of the light attenuating layer in the reflective image display transparent member of the present invention, as described above, the second transparent substrate 20 of FIGS. 1 and 3, the first transparent substrate 10 A of FIG. The transparent transparent film, the transparent film and the half mirror as exemplified for the colored transparent film of FIG. 7 and the first transparent substrate 10A and the second transparent substrate 20 in FIG. 8 can be mentioned.

In the reflective image display transparent member of the present invention, the image light from the projector may be projected to the second transparent substrate side. In this case, an antireflective film is provided on the surface of the second transparent substrate, or an antireflective structure is formed directly on the surface of the second transparent substrate.
Further, the video display unit 30 may be disposed such that the second transparent film 35 of the video display unit 30 is on the projector 200 side.

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

In the reflective image display transparent member of the present invention, the concavo-convex structure of the surface of the first transparent layer may be a regular concavo-convex structure (micro lens array or the like). However, it is preferable that the concavo-convex structure on the surface of the first transparent layer is an irregular concavo-convex structure for the following reason.
When a reflective film is formed on the surface of a regular uneven structure (micro-lens array etc.), light diffraction may cause color unevenness in the sight seen from the viewer's side as seen from the viewer's side and beyond the image display transparent member. The edge part of the sight seen from the observer side and seen on the other side of the image display transparent member looks iridescent, and the visibility is impaired. On the other hand, when the reflective film is formed on the surface of the irregular asperity structure, light diffraction and spectroscopy hardly occur, and these problems hardly occur. Therefore, the phenomenon that the color changes depending on the direction and place where the image display transparent member is viewed and the direction of the incident light is suppressed, and the spectrum of the scene seen behind the image display transparent member is suppressed. As a result, the visibility of the view seen on the other side of the image display transparent member is excellent, and it is possible to provide the property as a transparent screen that does not disturb the line of sight.

In addition, as another example of the convex-concave structure with a reflective film and the one after embedding the convex-concave structure, a half mirror laminated with a scattering material; one reflected, deflected and diffused by volume hologram; kinoform hologram, In addition, those that are deflected, reflected, and diffused by the surface of the uneven surface and the configuration in which a reflective film is formed on the surface; cholesteric liquid crystals, those utilizing polymeric cholesteric liquid crystals (aligned to the surface of uneven structure, cholesteric liquid crystals formed, polymers Cholesteric liquid crystal having irregularities by etching etc., liquid crystal layer of cholesteric liquid crystal formed of substrate of horizontal alignment and vertical alignment, and cholesteric liquid crystal to which surfactant is added is coated on the substrate And the light distribution surface of the coated surface is vertically distributed, or the alignment surface of the coated surface is dropped.
Further, even if there is no reflective film, it is not necessary to provide the reflective film if the first transparent base material 10 can sufficiently reflect and scatter light only with the uneven structure.

<Transparent type image display transparent member>
A second aspect of the image display transparent member of the present invention has a first surface and a second surface opposite to the first surface, and provides the viewer of the first surface with a viewer on the second surface. It transmits visibly, and transmits the sight on the second surface side visibly to the viewer on the first surface side, and the image light projected from the first surface side on the second surface viewer A transparent image display transparent member having a light attenuating layer for attenuating a part of light passing through the image display transparent member. It is a member.

FIG. 10 is a layer configuration diagram showing an example of the transmission type 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 denoted by the same reference numerals, and the description thereof will be omitted.
In the image display transparent member 5, the image display unit 40 is disposed between the first transparent base material 10 and the second transparent base material 20, and the light attenuation component is blended in the second transparent base material 20. And is a light attenuating layer for attenuating part of the light passing through the image display transparent member 1.
The first transparent substrate 10 and the image display unit 40 are adhered by the adhesive layer 12, and the second transparent substrate 20 and the image display unit 40 are adhered by the adhesive layer 22.
In the image display transparent member 5, when the second transparent base 20 is the light attenuation layer, when the observer Y looks at the view on the other side of the image display transparent member 5, the visibility of the view is It will be excellent.

(Video display unit)
The image display unit 40 is disposed in parallel with each other and at a predetermined interval inside the first transparent film 41; the transparent layer 42 provided on the surface of the first transparent film 41; It comprises a light scattering sheet having a plurality of light scattering portions 43 having a right triangle cross section extending in the plane direction and 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 the stripe shape is formed may be described as a louver structure.

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

(Transparent layer)
The transparent layer 42 is preferably a transparent resin layer.
As a transparent resin which comprises a transparent resin layer, the thing similar to the transparent resin which comprises the transparent resin layer of the imaging | video display part 30 mentioned above should just 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. If the thickness of the transparent layer 42 is 200 μm or less, it is easy to form the transparent layer 42 by a roll-to-roll process.

(Light scattering part)
The light scattering portion 43 includes, for example, a transparent resin, a light scattering material, and, optionally, a light attenuating material.

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

  As a 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) Particles of a low refractive index material such as porous silica (refractive index: 1.3 or less), hollow silica (refractive index: 1.3 or less); resin materials having different low refractive index compatibility with the transparent resin; 1 μm or less of resin material etc. are mentioned.

The concentration of the light scattering material is preferably 0.01 to 5% by volume, and 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, and more preferably 0.15 to 0.8 μm. When the average particle diameter of the fine particles is about the same as or slightly smaller than the wavelength of the light to be scattered, the probability of scattering forward is increased, and the function of scattering the incident light without refraction is enhanced. As a result, distortion of the view seen from the viewer side and seen on the other side of the image display transparent member 5 is suppressed, and the light quantity is not changed rapidly, so the visibility of the view is improved.

When the light scattering portion 43 includes a light attenuating material, part of light propagating as unnecessary stray light in the image display transparent member 5 can be attenuated, and the scattered light is reduced. Therefore, the phenomenon in which the image display transparent member 5 appears to be cloudy is suppressed, the contrast of the image is improved, and the visibility of the image is improved. In addition, the contrast of the scene seen from the viewer side and seen on the other side of the image display transparent member 5 is improved, and the visibility of the scene is also improved. In particular, when an environment of 100 lux or more exists in the line of sight of the observer due to the external light, the above effect is easily obtained.
Examples of light attenuating materials include carbon black and titanium black.
The concentration of the light attenuation material is preferably 0.01 to 10% by volume, and more preferably 0.1 to 3% by volume.

  10-250 micrometers is preferable and, as for the space | interval (the distance between the centers of the adjacent light-scattering parts 43) of the light-scattering part 43, 10-100 micrometers is more preferable. If the distance between the light scattering portions 43 is 10 μm or more, the light scattering portions 43 can be easily formed. If the distance between the light scattering portions 43 is 250 μm or less, it is difficult to visually recognize the light scattering portions 43.

  10 to 70% of the space | interval of the light-scattering part 43 is preferable, and 25 to 50% of the width | variety (direction of the surface of the image display part 40 and the longitudinal direction of the light-scattering part 43) of the light-scattering part 43 is preferable. . When the width of the light scattering portion 43 is 10% or more of the distance between the light scattering portions 43, the light scattering portion 43 can be easily formed. If the width of the light scattering portion 43 is 70% or less of the distance of the light scattering portion 43, the transmittance of the light scattering portion 43 and the visibility of the sight seen from the viewer side and the sight visible on the other side of the image display transparent member 5 Improve.

  The ratio of the height of the light scattering portion 43 to the width of the light scattering portion 43 (direction orthogonal to the plane direction of the image display portion 40), that is, the aspect ratio, is a projection incident obliquely while maintaining the transmittance of straight light of the scene. In order to scatter image light from the projector with high gain, it is preferably 1 or more, more preferably 1.5 or more, and even more preferably 2 or more.

(Method of manufacturing image display unit)
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 is applied on the surface of the first transparent film 41, and a plurality of convex stripes having a right-angled triangular cross section corresponding to the light scattering portion 43 are formed on the surface. The mold 62 is overlaid on the photocurable resin 46 such that the ridges contact the photocurable resin 46.

  Light (ultraviolet light, etc.) is irradiated 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, as shown in FIG. 11 (b), the mold 62 is peeled off.

  As shown in FIG. 11 (c), a paste containing a photocurable resin, a light scattering material, and, if necessary, a light attenuating material is supplied to the surface of the transparent layer lower layer 42a, and the excess is scraped with a doctor blade. By this, the paste 48 is embedded in the groove 44 of the transparent layer lower layer 42a. A light (ultraviolet ray or the like) is irradiated to harden the paste 48 to 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 42a and the surface of the light scattering portion 43, and the second transparent film 45 is superimposed on the photocurable resin 47.
Light (ultraviolet rays etc.) is irradiated from the side of the first transparent film 41 or the side of the second transparent film 45 to cure the photocurable resin 47 to form the transparent layer upper layer, thereby the image display section 40 is formed. Get

As the mold 62, a resin film, a metal plate, etc. in which a plurality of convex portions are formed on the surface can be mentioned.
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, a spray coating method and the like.

(Optical characteristics of transmission type image display transparent member)
The transmittance of the image display transparent member 5 is preferably 1% or more, more preferably 5% or more, from the viewpoint of good visibility of the sight seen from the viewer side to 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 still more preferably 8% or more from the viewpoint of securing the screen gain and the 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 sight seen from the viewer side to the other side of the image display transparent member 5 Is more preferred.

  0.01 or less is preferable, as for the difference of the refractive index of the transparent layer 42 in the image display transparent member 5, and the refractive index of the light-scattering part 43, 0.005 or less is more preferable, and 0.001 or less is more preferable. When the difference between the refractive index of the transparent layer 42 and the refractive index of the light scattering portion 43 is large, a scene seen from the viewer side and visible on the other side of the image display transparent member 5 is viewed in multiples. It is preferable that the transparent layer 42 and the light scattering portion 43 have the same refractive index in order to suppress rainbow unevenness and the spectrum 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 also 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, still more preferably 0.01 or less, and particularly preferably 0.001 or less.

(Video display system equipped with a transparent video display transparent member)
A second aspect of the image display system of the present invention is an image display system provided with the transmission type image display transparent member of the present invention and a projector installed on the first surface side of the image display transparent member. .

FIG. 10 is a schematic block 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 anything that can project the video light L on the video display transparent member 5. As the projector 200, a well-known projector etc. are mentioned.

(Image display method using a transparent image display transparent member)
According to a second aspect of the image display method of the present invention, image light is projected from the projector installed on the first surface side of the image display transparent member onto the transmission type image display transparent member of the present invention to display an image. It is a video display method to be displayed.

As shown in FIG. 10, in the light scattering portion 43, the image light L projected from the projector 200 and incident from the surface (first surface A) of the image display transparent member 5 on the side of the first transparent substrate 10 The light is imaged by scattering, and is displayed so as to be visible as an image to an observer Y on the opposite side to the projector 200.
In addition, since the gap 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 visibly transmitted to the observer Y on the second surface B side, and The view on the side of the surface B of 2 can be visibly transmitted to the observer X on the side of the first surface A.

(Mechanism of action)
In the transmissive image display transparent member 5 described above and the image display system and the image display method using the same, for example, the image display transparent member 5 is used as a window so that the second surface B is outside the room. In this case, a portion of the scattered light in which the light scattering portion 43 scatters the straight traveling light from the scene (indoor) entering the image display transparent member 5 from the first surface A side is the second transparent base that is the light attenuating layer. It is absorbed by the material 20 and decreases. As a result, when the observer Y views the view on the other side of the image display transparent member 5, the resolution of light transmitted from the other side of the image display transparent member 5 is improved. Therefore, the visibility of the scene is excellent. Moreover, the sunlight L1 which injected into the image display transparent member 5 from the 2nd surface B side is scattered by the light-scattering part 43, and a part of the reflected scattering light is the 2nd transparent base material 20 which is a light attenuating layer. Absorbed by and decreased. As a result, when the observer on the A side of the first surface views the view (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 view on the other side of the image display transparent member 5 as viewed from the observer Y is improved, and the visibility of the view in the daytime is excellent.
Further, in this example, a part of the transmitted and scattered light scattered by the light scattering portion 43 is attenuated by the second transparent base material 20 which is the light attenuating layer in the image light projected from the projector 200. Although the gain of an image falls compared with the case where there is no layer, this can be coped with by increasing the amount of the image light from the projector 200.
In the case of using a polarization dependent material for the second transparent substrate 20, by aligning the high transmittance of the polarization dependent material in the same direction as the main polarization direction of the projection light L, the image light The visibility of the observer Y can be enhanced by increasing the transmittance of the view on the other side while suppressing the decrease in gain.

(Other embodiments)
The transmission type image display transparent member of the present invention has a first surface and a second surface opposite to the first surface, and the viewer on the first surface side is directed to the viewer on the second surface side. It transmits visibly, and transmits the sight on the second surface side visibly to the viewer on the first surface side, and the image light projected from the first surface side on the second surface viewer The image display transparent member can be displayed visually as an image on the screen, as long as the image display transparent member has a light attenuating layer for attenuating part of the light passing through the image display transparent member. There is no limitation to the ten image display transparent members 5. Hereinafter, the same components as those of the image display transparent member 5 of FIG.

The transmission type image display transparent member of the present invention may be the image display transparent member 6 in which the first transparent base material 10 is omitted as shown in FIG. A specific example of the image display transparent member 6 is, for example, 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 multilayer glass having two glass plates and a frame-like spacer interposed at the periphery of the glass plates so that a gap is formed between the glass plates, one glass plate is a colored glass plate In addition, the image display unit 40 may be attached to the inner surface of one of the glass plates.

In the transmission type image display transparent member of the present invention, as shown in FIG. 13, instead of the first transparent substrate 10, a light attenuating component is blended to be colored, and a part of the light passing through the transparent member is Image having a first transparent substrate 10A to be a light attenuating layer to be attenuated, and having a second transparent substrate 20A which is not colored and not compounded with a light attenuating component instead of the second transparent substrate 20 The display transparent member 5A may be used.
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, a scene (outdoor) entering the image display transparent member 5A from the second surface B side A portion of the scattered light, which is the straight-ahead light scattered by the light scattering portion 43, is absorbed by the second transparent base material 20 which is the light attenuating layer and decreases. As a result, when the observer Y views the view on the other side of the image display transparent member 5A, the resolution of light transmitted from the other side of the image display transparent member 5 is improved. Therefore, the visibility of the scene is excellent. In addition, part of the reflected and scattered light scattered by the light scattering portion 43 from the light L2 of the illumination that has entered the image display transparent member 5A from the first surface A side is part of the first transparent base material 10A that is a light attenuating layer. It is attenuated and decreased. As a result, when the observer on the first surface A side views the view (outdoor) on the other side of the image display transparent member 5A, the contrast of the light transmitted from the other side of the image display transparent member 5A is improved. Therefore, the contrast of the view on the other side of the image display transparent member 5A is improved as viewed from the viewer on the first surface A side, and the visibility of the view at night is excellent.
When a material having polarization dependence is used for the first transparent base material 10A, by aligning the high transmittance of the material having polarization dependence in the same direction as the main polarization direction of the projection light L, the image light The visibility of the viewer X can be enhanced by increasing the transmittance of the view on the other side while suppressing the decrease in gain.

As shown in FIG. 14, the transmission type image display transparent member of the present invention has the first transparent base material 10 and the second transparent base material 20A which are not colored and do not contain any light attenuating component. A light attenuating component is compounded and colored on the surface of the second transparent base 20A opposite to the image display unit 40, and a light attenuating layer 50 for attenuating part of the light transmitted through the transparent member is disposed. The image display transparent member 7 may be used. The second transparent base 20A and the light attenuating layer 50 are bonded by an adhesive layer 52.
The light attenuating layer 50 and the adhesive layer 52 of the image display transparent member 7 are the same as the light attenuating layer 50 and the adhesive layer 52 of the image display transparent member 3.
In the image display transparent member 7, as in the image display transparent member 5, the contrast of the view on the other side of the image display transparent member 7 is improved as viewed from the viewer on the second surface B side, and the visibility of the view is improved. Excellent.

As shown in FIG. 15, the transmission type image display transparent member of the present invention omits the first transparent base material 10 and the second transparent base material 20, and the second transparent film 45 of the image display section 40. It may be an image display transparent member 8A in which the light attenuation layer 50 is disposed on the surface. In the image display transparent member 8A, similarly to the image display transparent member 5, the contrast of the view on the other side of the image display transparent member 8A is improved as viewed from the viewer on the second surface B side, and the visibility of the view is improved. Excellent.
Further, as shown in FIG. 16, an image in which the first transparent substrate 10 and the second transparent substrate 20 are omitted, and the light attenuation layer 50 is disposed on the surface of the first transparent film 41 of the image display unit 40. It may be a display transparent member 8B. In the image display transparent member 8B, similarly to the image display transparent member 5A, the contrast of the view on the other side of the image display transparent member 8B is improved as viewed from the viewer on the first surface A side, and the visibility of the view is improved. Excellent.

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

The image display transparent member of the transmission type according to the present invention, as shown in FIG. 17, is an image display having a first transparent base material 10A and a second transparent base material 20, both of which are colored by blending a light attenuating component. It may be the transparent member 5B.
In the image display transparent member 5B, for the same reason as the image display transparent member 5, the contrast of the view on the other side of the image display transparent member 5B is improved as viewed from the viewer on the second surface B side. Excellent in quality.

As shown in FIG. 18, the reflective image display transparent member of the present invention has the first transparent base material 10 and the second transparent base material 20A which are not colored and do not contain any light attenuating component. The second transparent film 45A is a video display transparent member 5C having a video display portion 40A which is colored by blending a light attenuating component and is a light attenuating layer for attenuating a part of light transmitted through the transparent member. May be
In the image display transparent member 5C, for the same reason as the image display transparent member 5, the contrast of the view on the other side of the image display transparent member 5C is improved as viewed from the viewer on the second surface B side. Excellent in quality.

Further, in the image display transparent member 5C, instead of the second transparent film 45A, a light attenuating component is blended in the first transparent film 41 to be colored, and light attenuation for attenuating part of the light transmitted through the transparent member It may be an image display transparent member which is a layer. Moreover, the light attenuation component is mix | blended and colored in both the 1st transparent film 41 and the 2nd transparent film 45, and the image display transparent which is a light attenuation layer which attenuates a part of light which permeate | transmits a transparent member It may be a member.
In addition, the image display transparent member of the transmission type of the present invention has a second transparent base 20A in which no light attenuation component is blended in the image display transparent member 5 instead of the second transparent base 20. And an image display transparent member in which a light attenuating component is blended in any one or both of the adhesive layer 12 and the adhesive layer 22 to be colored to form a light attenuating layer for attenuating a part of light transmitted through the transparent member. May be
Examples of the light attenuating component to be blended in the transparent film and the adhesive layer of the image display unit include, for example, the same ones as mentioned for the light attenuating layer 50.

A half mirror may be used as a light attenuating layer, as long as it has the function of reducing the transmittance as the function of the member forming the light attenuating layer.
The reflectance of the half mirror may be 5% or more, preferably 10% or more, and in some cases, it may be 25% or more.
By arranging the half mirror between the light scattering unit 43 and the projector, in addition to the above effects, the function as a magic mirror can be added, which makes it difficult for the observer to recognize a missing image in the forward direction. Will be able to In addition, by arranging the light scattering unit 43 in a portion other than between the light scattering unit 43 and the projector, projection on both sides is enabled.
As an aspect of the light attenuation layer in the transmission type image display transparent member of the present invention, as described above, the second transparent substrate 20 of FIGS. 10 and 12, the first transparent substrate 10A of FIG. The transparent transparent film, the transparent film as exemplified in the first embodiment of the transparent substrate 10A and the second transparent substrate 20 in FIG. 17 and a half mirror are exemplified.

In the transmission type 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 triangle as in the illustrated example, but may be another triangle, trapezoid, bell shape or the like. It may be.
As another example of the light scattering sheet of the image display unit, those which are transmitted, deflected and diffused by volume holograms; those which are deflected, scattered and diffused by kinoform type holograms and other structures having an irregular surface formed Can be mentioned.

Further, as the light scattering sheet of the image display unit, the light scattering layer is dispersed in the entire transparent layer without providing a plurality of light scattering portions as shown in the example shown in the transparent layer, and the transparent layer itself is used as a light scattering layer. It may be
Examples of the light scattering fine particles include fine particles of high refractive index materials such as titanium oxide, zirconium oxide and aluminum oxide described above; and fine particles of low refractive index materials such as porous silica and hollow silica. 0.01-5 volume% is preferable and, as for the density | concentration of light-scattering microparticles | fine-particles, 0.05-1 volume% is more preferable. The average particle diameter of the light scattering particles is preferably 50 to 1000 nm, and more preferably 100 to 800 nm, for the reason described above.
The light scattering layer may comprise a light attenuating material for the reasons described above. The concentration of the light attenuation 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 by way of examples, but the present invention is not limited by the following description.
Examples 2 and 4 are examples, and examples 1 and 3 are comparative examples.

(Example 1)
A UV curable resin (Ogsol (Osaka Gas Chemical Co., Ltd.) on the surface of a transparent polyethylene terephthalate (hereinafter referred to as PET) film (Toyobo Co., Ltd., Cosmo Shine (registered trademark) A4300, thickness: 0.1 mm) A solution in which 3 parts by mass of a photoinitiator (manufactured by BASF, IRGACURE (registered trademark) 907) was mixed with 100 parts by mass of EA (registered trademark) EA-F 5003 was applied to a thickness of 10 μm by a die coating method.
A white PET film (Toray Industries E20, arithmetic average roughness Ra: 0.23 μm) having an irregular asperity structure formed on the surface, such that the asperity structure is in contact with the ultraviolet curable resin, on the ultraviolet curable resin It piled up on.

After irradiating a 1000 mJ ultraviolet ray from the side of the transparent PET film and curing the ultraviolet curable resin to form a first transparent layer on the surface of which the irregular uneven structure of the white PET film is transferred, white PET film Peeled off.
On the surface of the first transparent layer, aluminum was physically deposited by vacuum deposition to form a reflective film made of an aluminum thin film (thickness: 8 nm).

100 parts by mass of an ultraviolet curable resin (Ogsol (registered trademark) EA-F 5003 manufactured by Osaka Gas Chemical Co., Ltd.) on the surface of the reflective film, 3 parts by mass of a photoinitiator (IRGACURE (registered trademark) 907 manufactured by BASF Corporation) The partially mixed solution was applied by die coating to a thickness of 10 μm, and a transparent PET film (thickness: 0.1 mm) was superimposed on the ultraviolet curable resin.
The image display unit of Example 1 formed of a light scattering sheet was obtained by irradiating an ultraviolet ray of 1000 mJ and curing the ultraviolet curable resin to form a second transparent layer.

  Soda lime glass plate (manufactured by Matsunami Glass Co., Ltd., thickness: 3 mm), polyvinyl butyral (hereinafter referred to as PVB) film (Salutia Saflex RK 11 l, thickness: 375 μm), image display unit of Example 1, PVB film ( It laminated | stacked in order of thickness: 375 micrometers and a soda lime glass board (thickness: 3 mm), vacuum-heat-pressing was performed, and the image display transparent member of the reflection type of Example 1 was obtained. The evaluation results of the image display transparent member of Example 1 are shown in Table 1.

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

(Example 3)
A UV-curable resin (Hitachi Chemical Co., Ltd., Hytaloid (registered trademark) 7981, specific gravity 1.1) is blade coated on the surface of a transparent PET film (Cosmo Shine (registered trademark) A4300 manufactured by Toyobo Co., Ltd., thickness: 50 μm) The coating was applied to a thickness of 80 μm.
The mold has a plurality of ridges of a cross-sectional right-angled triangle corresponding to the light scattering portion formed on the surface, and the ridges are in contact with the ultraviolet curable resin, under the conditions of temperature: 25 ° C., gauge pressure: 0.5 MPa It was pressed onto the curable resin.

  The ultraviolet ray is irradiated from the side of the transparent PET film to cure the ultraviolet curable resin, and after forming the transparent layer lower layer (thickness: 10 μm) having the groove corresponding to the convex line of the mold formed on the surface, It peeled off. As a result, a plurality of grooves having a spacing 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 are formed on the surface of the transparent layer lower layer in the 100 mm × 100 mm region.

A titanium oxide fine particle (average particle size: 0.2 μm, specific gravity 4.2) is 0.1% by volume in an ultraviolet-curable resin (Hitaloid (registered trademark) 7981 manufactured by Hitachi Chemical Co., Ltd.) A mixed paste was prepared.
The paste was supplied to the surface of the lower layer of the transparent layer and the excess was scraped with a doctor blade to embed the paste in the groove of the lower layer of the transparent layer. A light scattering portion was formed by irradiating ultraviolet light and curing the paste.

Apply 5 μm of UV curable resin (Hitaloid (registered trademark) 7981 manufactured by Hitachi Chemical Co., Ltd., specific gravity: 1.1) on the surface of the lower layer of the transparent layer and the surface of the light scattering part by die coating method, transparent on UV curable resin The PET film was overlaid.
The image display part of Example 3 which consists of a light-scattering sheet was obtained by irradiating an ultraviolet-ray and hardening ultraviolet-ray curable resin, and forming a transparent layer upper layer.

  Soda lime glass plate (Matsunami Glass Co., Ltd., thickness: 3 mm), PVB film (Solutia Saflex (registered trademark) RK 11 l, thickness: 375 μm), Example 3 image display part, PVB film (thickness: 375 μm) A soda lime glass plate (thickness: 3 mm) was laminated in this order and vacuum heat compression was performed to obtain a transmission type image display transparent member of Example 3. The evaluation results of the image display transparent member of Example 3 are shown in Table 1.

(Example 4)
In the image display transparent member of Example 3, a transparent image display of Example 4 is transparent using colored glass (made by Asahi Glass Co., Ltd., <trade name> Myvale, similar to Example 2) as the second transparent substrate. I got a member. The evaluation results of the image display transparent member of Example 4 are shown in Table 1.

The evaluation criteria in the table are as follows.
(Sight visibility)
The image display transparent member is installed outdoors during the day so that the second surface faces the sun, and the visibility of the view seen from the viewer on the second surface side to the other side of the image display transparent member is The following criteria were evaluated.
0: Good.
1: Good when the foreground is dark or when the outside light is small.
2: Level at which rough recognition is possible.
3: I can not see the sight.

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

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

The image display transparent member of the present invention is a showcase of goods, etc .; an exhibition case of art, animals, etc .; a window of a building, a showroom, a vehicle, etc .; a glass door; a transparent partition of the room; It is useful as a transparent member to be used. Specifically, it is possible to visually recognize the view seen from the transparent member from the observer side and to communicate information such as the description of the product, the state of various devices, the destination guidance, and the transmission items to the observer. When displaying the operation screen etc. of various devices to the observer, or when making it impossible for the observer to visually recognize the view on the other side of the transparent member for privacy protection, security, etc. It is useful as a so-called transparent screen that displays the image light projected from the image in such a way as to be visible to the observer as an image.
Moreover, when it uses for the window glass for moving means, such as a vehicle and an aircraft, since it can use as a transparent screen and a head-up display, it is useful.
The entire contents of the specification, claims, drawings, and abstract of Japanese Patent Application No. 2014-128552 filed on June 23, 2014 are incorporated herein by reference, as disclosure of the specification of the present invention, It is what it takes.

1 to 3, 5 to 7, 1A to 1C, 4A, 4B, 5A to 5C, 8A, 8B: image display transparent member, 10: first transparent base, 10A: first transparent base (light attenuating layer) ), 12: adhesive layer, 20: second transparent substrate (light attenuating layer), 20A: second transparent substrate, 22: adhesive layer, 30, 30A: image display unit, 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: light curable resin, 37: Photocurable resin, 40, 40A: Image display part, 41: First transparent film, 42: Transparent layer, 42a: Transparent layer lower 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: Paper G, 50: light attenuation layer, 52: adhesive layer, 61: mold, 62: mold, 101: image display transparent member, 102: image display transparent member, 110: first transparent base, 120: second transparent Base material 132: first transparent layer 133: reflective film 134: second transparent layer 142: transparent layer 143: light scattering portion 200: projector A: first surface B: first 2 faces, L: image light, X: observer, Y: observer

Claims (15)

It has a first surface and a second surface opposite to it, transmits the view of the first surface visibly to the viewer of the second surface, and the view of the second surface The image light that is visibly transmitted to the viewer on the first surface side and projected from the projector installed on the first surface is visibly displayed to the viewer on the first surface side Reflective image display transparent member,
Between the first surface and the second surface,
A first transparent layer having an uneven structure on the surface,
A reflective film formed along a surface of the first transparent layer on the side of the concavo-convex structure, which transmits a part of incident light;
A second transparent layer provided to cover the surface of the reflective film,
A video display unit having
An adhesive layer bonds the transparent substrate provided on one or both of the first surface side and the second surface side of the image display unit with the image display unit.
Wherein one or both of the adhesive layer has a light attenuating layer for attenuating a portion of the light transmitted through the image display transparent member, the image display transparent member. Forward haze is less than 20%,
Back haze is more than 5%,
The image display transparent member according to claim 1, wherein a ratio of rear haze to front haze (rear haze / forward haze) is 1 or more. The uneven structure of the surface of the first transparent layer is an irregular concave-convex structure, the image display transparent member according to claim 1 or 2. It has a first surface and a second surface opposite to it, transmits the view of the first surface visibly to the viewer of the second surface, and the view of the second surface Image light that is visibly transmitted to the viewer on the first surface side and projected from the projector installed on the first surface is visibly displayed to the viewer on the second surface side Transparent image display transparent member,
  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;
  An adhesive layer bonds the transparent substrate provided on one or both of the first surface side and the second surface side of the image display unit with the image display unit.
  The image display transparent member, wherein any one or both of the adhesive layers is a light attenuating layer for attenuating a part of light transmitted through the image display transparent member. Front haze is 4 to 40% display a transparent member according to claim 4. The image display transparent member according to any one of claims 1 to 5 , wherein the light attenuation layer has polarization dependency. The image display transparent member as described in any one of Claims 1-6 whose transmittance | permeability of the said light attenuation layer is 70% or less. 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 1-7 The image display transparent member according to any one of the above. The image display transparent member according to any one of claims 1 to 7 , wherein the light attenuation layer is bluish (x to 0.33, y to 0.5 in the xyY color system). The image display transparent member according to any one of claims 1 to 7 , wherein the light attenuation layer is greenish (y> x, 0.33 to y in the xyY color system). The image display transparent member according to any one of claims 1 to 7 , wherein the light attenuation layer is a half mirror. The transparent base material as a light attenuating layer for attenuating a part of the light passing through the image display transparent member is provided on the second surface side of the image display unit. The image display transparent member according to any one of the items. The image display transparent member according to claim 12 , wherein the area of the transparent substrate is the same as the area of the image display unit or larger than the area of the image display unit. The image display transparent member according to any one of claims 1 to 13 .
A projector installed on the first surface side of the image display transparent member;
, An image display system. The image display transparent member according to any one of claims 1 to 13 ,
A video display method, wherein video light is projected from a projector installed on the first surface side of the video display transparent member to display a video.

Images