JP6529728B2 - Image display system and image display method - Google Patents

Description

  The present invention relates to an image display system and an image display method for displaying image light projected from a projector onto an image display transparent member as an image so as to be visible to an observer.

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.

  As a reflection type image display transparent member, for example, as shown in FIG. 9, a regular uneven structure (micro lens on the surface between a first transparent base 110 and a 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. 9, 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.

  As the transparent image display transparent member, for example, as shown in FIG. 10, 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. 10, 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 recent years, as a projector, a short focus projector has been developed which displays a large image on an image display transparent member by projecting image light from a close distance. In the short focus projector, since the projection distance to the image display transparent member is relatively short, the incident angle of the image light to the surface of the image display transparent member is larger than that of a normal projector. Therefore, when the short focus projector is used, the brightness of the displayed image varies between the portion near the short focus projector and the portion far from the short focus projector in the image display transparent member. In addition, the contrast of the displayed image is reduced and the image quality is reduced. Therefore, a video display transparent member capable of maintaining a high contrast of the displayed video with little variation in luminance in the displayed video, in particular, a video display transparent member capable of maintaining the high contrast of the displayed video is required. It is done.

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

  The present invention is an image display system and an image display method using a short focus projector, which displays images on the image display transparent member without reducing the visibility of a scene seen from the viewer side and visible on the other side of the image display transparent member. Image display system and image display method capable of maintaining a high contrast state of the displayed image.

The present invention has the following configuration.
[1] A transparent member having a first surface and a second surface opposite to the first surface, which transmits the view on the first surface so as to be visible to the viewer on the second surface, and the second Of the image on the side of the first surface visible to the observer on the first side, and the image light projected from the projector installed on the first side is displayed on the first side of the observer And a projector provided on the first surface side of the image display transparent member, wherein the projector is a short focus projector. The transmittance of the image display transparent member is 5 to 80 %, the reflectance of the image display transparent member is 18% or more, and the rear haze of the image display transparent member is 5 to 80%. The image display system, wherein the forward haze of the image display transparent member is 50% or less.
[2] in the part closest to the projector of the image displayed on the image display transparent member, an incident angle of the image light to the first face of the image display transparent member is 15 to 60 degrees, [1] Video display system.
[3] The image display transparent member, between the first surface and the second surface has a first transparent layer having an uneven structure on the surface, the arithmetic mean of the concavo-convex structure of the first transparent layer The image display system of [1] or [2], wherein the roughness Ra is 0.01 to 20 μm.
[4] A part of incident light formed between the first surface and the second surface along the surface on the uneven structure side of the first transparent layer by the image display transparent member The image display system according to [3], further including a transmitting reflective film and a second transparent layer provided to cover the surface of the reflective film. [5] The image display system according to [3] or [4], wherein the concavo-convex structure of the surface of the first transparent layer in the video display transparent member is an irregular concavo-convex structure.
[6] A transparent member having a first surface and a second surface opposite to the first surface, which transmits the view on the first surface so as to be visible to the viewer on the second surface, and the second The view on the side of the face is visibly transmitted to the viewer on the first side, and the image light projected from the first side is visibly displayed to the viewer on the second side. It is an image display system provided with a transparent image display transparent member and a projector installed on the first surface side of the image display transparent member, wherein the projector is a short focus projector, and the image display The image display system, wherein the transmittance of the transparent member is 5% or more, the reflectance of the image display transparent member is 15% or less, and the forward haze of the image display transparent member is 8 to 40%.
[7] in the part closest to the projector of the image displayed on the image display transparent member, an incident angle of the image light to the first face of the image display transparent member is 15 to 60 degrees, [6] Video display system.
[8] The image display transparent member is disposed between the first surface and the second surface, in the transparent layer and in the transparent layer, parallel to each other and at a predetermined interval, along the surface direction The image display system according to [6] or [7], further comprising: a plurality of light scattering portions extending.

[9] A transparent member having a first surface and a second surface opposite to the first surface, which transmits the view on the first surface so as to be visible to the viewer on the second surface, and the second The view on the side of the face is visibly transmitted to the viewer on the first side, and the image light projected from the first side is visibly displayed to the viewer on the first side. A method of projecting video light from a projector installed on the first surface side of the video display transparent member on a reflective video display transparent member to display a video, wherein the projector is a short focus projector The transmittance of the image display transparent member is 5 to 80 %, the reflectance of the image display transparent member is 18% or more, and the rear haze of the image display transparent member is 5 to 80%. And the forward haze of the image display transparent member is 50% or less.
[10] in the part closest to the projector of the image displayed on the image display transparent member, an incident angle of the image light to the first face of the image display transparent member is 15 to 60 degrees, [9] Video display method.
[11] The image display transparent member has a first transparent layer having a concavo-convex structure on the surface between the first surface and the second surface, and the arithmetic mean of the concavo-convex structure of the first transparent layer The image display method of [9] or [10], wherein the roughness Ra is 0.01 to 20 μm.
[12] The image display transparent member is a part of incident light formed between the first surface and the second surface along the surface of the first transparent layer on the uneven structure side The image display method according to [11], further including a transmitting reflective film and a second transparent layer provided to cover the surface of the reflective film. [13] The video display method according to [11] or [12], wherein the concavo-convex structure of the surface of the first transparent layer in the video display transparent member is an irregular concavo-convex structure.
[14] A transparent member having a first surface and a second surface opposite to the first surface, which transmits the view on the first surface so as to be visible to the viewer on the second surface, and the second The view on the side of the face is visibly transmitted to the viewer on the first side, and the image light projected from the first side is visibly displayed to the viewer on the second side. A method of projecting video light from a projector installed on the first surface side of the video display transparent member onto a transparent video display transparent member to display a video, wherein the projector is a short focus projector. The transmittance of the image display transparent member is 5% or more, the reflectance of the image display transparent member is 15% or less, and the forward haze of the image display transparent member is 8 to 40%. , How to display images.
[15] in the part closest to the projector of the image displayed on the image display transparent member, an incident angle of the image light to the first face of the image display transparent member is 15 to 60 degrees, [14] The projection method described in.
[16] The image display transparent member is disposed in parallel to each other between the first surface and the second surface, inside the transparent layer and the transparent layer, at a predetermined interval, along the surface direction The image display method according to [14] or [15], further comprising: a plurality of light scattering portions extending.

  According to the video display system and the video display method of the present invention, in the video display system and the video display method using the short focus projector, the visibility of the sight seen from the viewer side and visible on the other side of the video display transparent member is reduced. It is possible to maintain a high contrast of the image displayed on the image display transparent member without causing the image display transparent member.

It is a schematic block diagram which shows an example of the image display system of this invention, and a layer block diagram which shows an example of a reflection type image display transparent member. It is sectional drawing which shows an example of the manufacturing process of a reflection type image display transparent member. It is a layer block diagram which shows the other example of a reflection type image display transparent member. It is a layer block diagram which shows the other example of a reflection type image display transparent member. It is 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 a transmissive | pervious image display transparent member. It is sectional drawing which shows an example of the manufacturing process of a transmissive | pervious image display transparent member. It is a layer block diagram which shows the other example of a transparent type image display transparent member. It is a layer block diagram which shows the other example of a transmissive | pervious image display transparent member. It is a schematic block diagram which shows an example of the conventional image display system, and a layer block diagram which shows an example of a reflection type image display transparent member. It is a schematic block diagram which shows the other example of the conventional image display system, and a layer block diagram which shows an example of a 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 “incident angle” means an angle formed by the incident direction of the image light and the normal to the first surface of the image display transparent member.
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.
The "sheet" may be a sheet or a continuous band.
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 the sum of the light transmitted without being diffused and the light transmitted by being diffused, which is equivalent to the total light transmittance. However, it does not include those greatly deviated from the incident site or emitted from the end of the member.
The reflectance is the sum of the regular reflectance and the diffuse reflectance, and is equal to the total light reflectance. However, it does not include those greatly deviated from the incident site or emitted from the end of the member.
The transmittance, the reflectance, and the refractive index are values measured at room temperature using the d-line of the sodium lamp (wavelength: 589 nm).

<Video display system provided with reflective type video display transparent member>
A first aspect of the video display system of the present invention is a video display system including a reflective video display transparent member and a projector installed on the first surface side of the video 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.

(Projector)
The projector 200 is a short focus projector capable of projecting the image light L onto the image display transparent member 1.
The short focus projector is a projector capable of projecting image light from a close distance of 10 to 90 cm, and may be referred to as an ultra short focus projector.
By using a short focus projector, light near the center of the image in which the density of the light quantity is high is positive on the first surface A of the image display transparent member 1 even at a position deviated from the focal position in the optical axis direction. Since the emission angle of the reflected light R and the emission angle of the transmitted light T transmitted through the reflective film 33 without forming an image become large, the reflected light R and the transmitted light T are in the eyes of the observer X and the observer Y It is hard to enter.

The projector 200 has an incident angle α of the image light on the first surface A of the image display transparent member 1 in a portion closest to the projector 200 of the image displayed on the image display transparent member 1 of 15 to 60 degrees. Preferably, it is installed on the first surface A side of the image display transparent member 1 so that If the incident angle α is 15 degrees or more, the emission angle of the reflected light R specularly reflected on the first surface A and the emission angle of the transmitted light T transmitted through the reflective film 33 without forming an image increase. It is difficult for the reflected light R and the transmitted light T to enter the eyes of the observer X and the observer Y. If the incident angle α is 60 degrees or less, the decrease in luminance of the image display transparent member 1 can be suppressed. That is, when the incident angle of the image light L is small, the light is scattered by the reflective film 33 and scattered light toward the viewer X increases to increase the luminance, but when the incident angle of the image light L is large, the light is scattered by the reflective film 33 As a result, the scattered light toward the viewer X decreases and the luminance decreases. The incident angle α is preferably 15 to 50 degrees, and more preferably 20 to 45 degrees.
The image light L projected from the projector 200 has a larger incident angle with distance from the projector 200, and is not viewed by the viewer X unless it is scattered in an angular direction away from regular reflection. Therefore, the light amount closer to the projector 200 is smaller than the original image, and the light amount closer to the projector 200 is larger, so that the light amount reaching the viewer X is equal to that of the original image. The distribution may be corrected.
Further, the incident angle of the image light L to the first surface A of the image display transparent member 1 at the center of the image displayed on the image display transparent member 1 may be 30 degrees or more. If the incident angle is 30 degrees or more, it is difficult for the observer to visually recognize high-intensity light not forming an image in the vicinity of the center of the image displayed on the image display transparent member 1 in a wide range. The incident angle is more preferably 45 degrees or more.

(Reflective image display transparent member)
The reflective image display transparent member is a transparent member having a first surface and a second surface opposite to the first surface, and the viewer of the first surface can be seen by the viewer on the second surface. Through the first surface, and the image light projected from the first surface to the viewer of the first surface. It is an image display transparent member which is displayed visibly as.

FIG. 1 is a layer configuration diagram showing an example of a reflective image display transparent member.
In the image display transparent member 1, the light scattering sheet 30 is disposed between the first transparent base material 10 and the second transparent base material 20.
The first transparent substrate 10 and the light scattering sheet 30 are bonded by the adhesive layer 12, and the second transparent substrate 20 and the light scattering sheet 30 are bonded by the adhesive layer 22.

(Transparent substrate)
Examples of the material of the first transparent base material 10 and the second transparent base material 20 (hereinafter collectively referred to as a transparent base material) include glass, transparent resin, and the like. The material of each transparent substrate may be the same or different.

  As glass which comprises a transparent base material, soda lime glass, alkali free glass, borosilicate glass, aluminosilicate glass etc. are mentioned. The transparent substrate 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 transparent substrate may, for example, be polycarbonate, polyester (polyethylene terephthalate, polyethylene naphthalate etc.), triacetyl cellulose, cycloolefin polymer, polymethyl methacrylate or the like, and polycarbonate is preferable from the viewpoint of weatherability and transparency. , Polyesters and cycloolefin polymers are preferred.

As a transparent base material, what does not have birefringence is preferable.
The thickness of the transparent substrate 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 thermosetting resin compositions 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.

(Light scattering sheet)
The light scattering sheet 30 comprises: a first transparent film 31; a first transparent layer 32 provided on the surface of the first transparent film 31 having an irregular asperity 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 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 obstacle and is more preferred.

Further, as in the present invention, when the incident angle α of the image light on the first surface A of the image display transparent member 1 at a portion closest to the projector 200 of the image displayed on the image display transparent member 1 is large. , The angle of incidence at the part far from the projector 200 is further increased. Therefore, in a portion far from the projector 200, the light is scattered by the reflective film 33, the amount of scattered light toward the viewer X decreases, and the luminance decreases. As a result, uneven brightness occurs in the image displayed on the image display transparent member 1. When the arithmetic average roughness Ra of the concavo-convex structure is 0.2 μm or more, the decrease in luminance in the portion far from the projector 200 is suppressed, and the luminance unevenness of the image is suppressed. If the arithmetic mean roughness Ra of the concavo-convex structure is 0.4 μm or more, the luminance unevenness of the image can be suppressed, which is more preferable.
Also, the arithmetic mean roughness of the concavo-convex structure may be different depending on the location of the surface of the first transparent layer 32. For example, by providing the arithmetic mean roughness in a portion near to the projector 200 and the arithmetic mean roughness in a portion far from the projector 200 with a slope, uneven brightness of the image can be suppressed. In this case, it is preferable that the arithmetic mean roughness be larger as it is farther from the projector 200.
Further, it is preferable that the aspect ratio of the unevenness is larger than the arithmetic average roughness as it is farther from the projector 200.
Also, in some cases, it may be preferable that the pitch of the concavities and convexities be smaller as the distance from the projector 200 is smaller than the arithmetic mean roughness.

(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.

Examples of the metal constituting the metal film and the semiconductor film include aluminum, silver, nickel, chromium, tungsten, silicon and the like, and aluminum, silver, or an alloy containing them as the 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 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 a sufficient screen gain can be obtained.
The reflectance of the reflective film 33 may be different depending on the location of the surface of the reflective film 33. For example, in the portion near the projector 200, the reflectance is small, and in the portion far from the projector 200, the luminance unevenness of the image can be suppressed by providing the tilt so as to increase the reflectance.
Further, in order to change the reflectance or the viewing angle depending on the place on the surface of the image display transparent member 1, the film thickness of the reflective film 33 may be different depending on the place of the image display transparent member 1. For example, by making the film thickness of the reflective film 33 in a part far from the projector 200 and the film thickness of the reflective film 33 in a part distant from the projector 200 inclined, unevenness in luminance of the image can be suppressed. In particular, in the case of a metal film, a phenomenon in which the reflectance increases as the film thickness increases may be used.
Also, when the film thickness of the reflective film 33 is made different depending on the location of the image display transparent member 1, (i) the image display transparent member 1 so that the transmittance of the image display transparent member 1 becomes uniform in the plane. The absorption coefficient is made to have a gradient depending on the location of the image display transparent member 1 by further providing an absorption material layer on the substrate or by using the absorption material for either the base material or the layer constituting the image display transparent member 1 (Ii) It is preferable to make the thickness of the image display transparent member 1 have an inclination so as to cancel the change of the transmittance caused by the change of the reflectance in the plane.

(Method of manufacturing light scattering sheet)
An example of a method of manufacturing the light scattering sheet 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.
Light (ultraviolet light, etc.) is irradiated from the side of the first transparent film 41 or the side of the second transparent film 35 to cure the photocurable resin 37 to form the second transparent layer 34, thereby allowing light to be generated. The scattering sheet 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 5% or more, more preferably 10% 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 90% or less, more preferably 80% or less, and still more preferably 75% or less from the viewpoint of appropriately maintaining the screen gain (brightness).

  The reflectance of the surface of the first surface A of the image display transparent member 1 is preferably 5% or less, more preferably 2% or less, and still more preferably 1% or less from the viewpoint of suppressing the reflection of the image light L.

  The reflectance of the image display transparent member 1 is 10% or more, preferably 30% or more. If the reflectance of the image display transparent member 1 is 10% or more, it can be seen by human being that the reflectance around this can be obtained especially for the reflected light that deviates 0.044 rad (2.5 °) or more from the regular reflection light. Since it is difficult to understand the change in sensitivity, a sufficient screen gain can be obtained.

In the present invention, by using a short focus projector, the incident angle of the image light L on the first surface A of the image display transparent member 1 becomes large, and the region where the light amount of the image light L is strong becomes the image display transparent member 1 Can be transmitted at a large emission angle, or specularly reflected at a large emission angle on the first surface A of the image display transparent member 1 so as to be difficult to reach the observer. However, since the incident angle of the image light L becomes large, the transmitted light T reaches the floor or ceiling near the image display transparent member 1. Then, when the transmitted light T reaches the floor or ceiling, the light scattered on the floor or ceiling is reflected on the image display transparent member 1 to cause a drop in the contrast of the image.
In the present invention, by increasing the reflectance of the image display transparent member 1 to the above degree, the light amount of the transmitted light T reaching the floor or the ceiling is reduced, and the transmitted light T reaches the floor or the ceiling. The light scattered by the ceiling can reduce the amount of light that is transmitted through the image display transparent member 1 and captured, and a decrease in the contrast of the image displayed on the image display transparent member 1 can be prevented. In particular, when the incident angle of the image light L at a portion farthest to the projector 200 of the image displayed on the image display transparent member 1 is 50 degrees or more, the transmitted light T is on the floor or ceiling near the image display transparent member 1 In addition to reaching, among the light scattered on the floor and the ceiling, light having an angle difference of less than 90 degrees from the normal reflection angle, which is an area with a relatively large amount of light, reaches the image display transparent member 1. The effect of

  The forward haze of the image display transparent member 1 is 50% or less, 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 1 More preferable.

The rear haze of the image display transparent member 1 is 5% or more, preferably 15% or more, more preferably 30% or more, and still more preferably 50% or more from the viewpoint of securing the screen gain and the contrast.
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 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%.

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

As shown in FIG. 1, the image light L projected from the projector 200 and incident from the first surface A of the image display transparent member 1 forms an image by scattering in the reflective film 33, and is the same as the projector 200. It can be displayed visually as an image to the observer X who is on the side.
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 image display system and the image display method of the present invention using the reflection type image display transparent member 1 described above, even by using a short focus projector, even at a position deviated from the focal position in the optical axis direction, The light in the vicinity of the center of the image where the density of light quantity is high is the transmission angle of the reflected light R specularly reflected on the first surface A of the image display transparent member, and the transmission transmitted through the reflective film 33 without forming an image The emission angle of the light T is increased. Therefore, it is difficult for the reflected light R and the transmitted light T to enter the eyes of the observer X and the observer Y, and the glare caused by the reflected light R and the transmitted light T originating from the image light L projected from the projector 200 And observer Y is hard to feel. In addition, since it is not necessary to set the degree of scattering of the first surface A and the reflective film 33 high in order to suppress glare, the front haze can be 50% or less, and the observer X and the observer Y side It does not reduce the visibility of the sight seen on the other side of the image display transparent member 1 when viewed from the side.
However, since the incident angle of the image light L on the first surface A of the image display transparent member 1 is increased by using the short focus projector, the transmitted light T reaches the floor or ceiling near the image display transparent member 1 It will be. Then, when the transmitted light T reaches the floor or ceiling, the light scattered on the floor or ceiling is reflected on the image display transparent member 1 and causes a drop in the contrast of the image. Therefore, by making the reflectance of the image display transparent member 1 10% or more, the light amount of the transmitted light T reaching the floor or the ceiling is reduced, and the transmitted light T reaches the floor or the ceiling and is scattered on the floor or the ceiling The amount of light transmitted through the image display transparent member 1 can be reduced, and the decrease in the contrast of the image displayed on the image display transparent member 1 can be prevented.
In addition, since the incident angle to the first surface A of the image display transparent member 1 is increased by using the short focus projector, the light is scattered by the reflective film 33 and the scattered light toward the viewer X is reduced, and the luminance is low. An area is generated. Therefore, by using the image display transparent member 1 having a rear haze of 5% or more, an appropriate screen gain can be obtained in each region, and the image can be viewed regardless of the image display position of the image display transparent member 1 become able to.

(Other embodiments)
The reflective image display transparent member in the present invention is a transparent member having a first surface and a second surface opposite to the first surface, and the view on the first surface side is a second surface side. The first surface side transmits image light visible to the observer, transmits the view on the second surface side to the first surface observer in a visible manner, and projects the image light projected from the first surface side The image display transparent member may be any image display transparent member that can be visually displayed as an image to an observer of the present invention, and is not limited to the image display transparent member 1 of FIG. 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.

As shown in FIG. 3, the reflective video display transparent member may be the video display transparent member 2 in which the first transparent base material 10 is omitted. 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 light scattering sheet 30 is attached to the existing window glass or the like. .
Moreover, in the image display transparent member 1 of FIG. 1, the second transparent base material 20 may be omitted.
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, the inner surface of one of the glass plates is: The light scattering sheet 30 may be attached.

As shown in FIG. 4, the reflective image display transparent member may be the image display transparent member 3 in which the first transparent base material 10 and the second transparent base material 20 are omitted, that is, the light scattering sheet 30 itself. Good. The image display transparent member 3 can be attached to an existing window glass or the like by using an adhesive layer. Further, the image display transparent member 3 can be deformed, and is suitable for forming an image display transparent member having a curved surface.
Further, in the image display transparent member 3 of FIG. 4, the first transparent film 31 and the second transparent film 35 may be replaced with the first transparent substrate 10 and the second transparent substrate 20. .

In the reflective image display transparent member, the image light from the projector may be projected to the second transparent substrate side. In this case, the surface on the second transparent substrate side is the first surface A.
In addition, the light scattering sheet 30 may be disposed such that the second transparent film 35 of the light scattering sheet 30 is on the projector 200 side.

In the light scattering sheet, 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, an antireflective film may be provided on one or both of the first surface and the second surface.

In the reflective image display transparent member, the concavo-convex structure of the surface of the first transparent layer may be a regular concavo-convex structure (micro lens array etc.). 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, it is possible to have the property as a transparent screen which is excellent in the visibility of the view seen on the other side of the image display transparent member and the color reproducibility of the view and the image and 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.

<Video Display System Equipped with Transparent Video Display Transparent Member>
A second aspect of the video display system according to the present invention is a video display system including a transmissive video display transparent member and a projector installed on the first surface side of the video display transparent member.

FIG. 5 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 4 and a projector 200 installed on the first surface A side of the video display transparent member 4.

(Projector)
The projector 200 is a short focus projector capable of projecting the image light L onto the image display transparent member 4.
By using a short focus projector, light in the vicinity of the center of the image where the density of the light quantity is high is positive on the first surface A of the image display transparent member 4 even at a position deviated from the focal position in the optical axis direction. Since the emission angle of the reflected light R reflected and the emission angle of the transmitted light T transmitted through the light scattering portion 43 without forming an image become large, the reflected light R and the transmitted light T are the eyes of the observer X and the observer Y It is hard to get into.

The projector 200 has an incident angle α of the image light on the first surface A of the image display transparent member 4 in a portion closest to the projector 200 of the image displayed on the image display transparent member 4 at 15 to 60 degrees. Preferably, it is installed on the first surface A side of the image display transparent member 4 so that If the incident angle α is 15 degrees or more, the emission angle of the reflected light R specularly reflected on the first surface A and the emission angle of the transmitted light T transmitted through the light scattering portion 43 without forming an image increase. It is difficult for the reflected light R and the transmitted light T to enter the eyes of the observer X and the observer Y. If the incident angle α is 60 degrees or less, the decrease in luminance of the image display transparent member 4 can be suppressed. That is, if the incident angle of the image light L is small, the light scattering portion 43 scatters and the scattered light toward the viewer Y increases and the luminance increases, but if the incident angle of the image light L is large, the light scattering portion 43 And scatter toward the viewer Y, and the luminance decreases. The incident angle α is preferably 20 to 50 degrees, and more preferably 30 to 45 degrees.
The image light L projected from the projector 200 has a larger incident angle with distance from the projector 200, and is not viewed by the observer Y unless it is scattered in an angular direction away from regular reflection. Therefore, the light amount closer to the projector 200 is smaller than the original image, and the light amount closer to the projector 200 is larger, so that the light amount reaching the observer Y is equal to that of the original image. The distribution may be corrected.
In addition, the incident angle of the image light L to the first surface A of the image display transparent member 4 at the center of the image displayed on the image display transparent member 4 may be 30 degrees or more. If the incident angle is 30 degrees or more, it is difficult for the observer to visually recognize high-intensity light not forming an image in the vicinity of the center of the image displayed on the image display transparent member 4 in a wide range. The incident angle is more preferably 45 degrees or more.

(Transparent type image display transparent member)
The transmission type image display transparent member is a transparent member having a first surface and a second surface opposite to the first surface, and the viewer of the first surface can be seen by the viewer on the second surface. Of the second surface, and the image light projected from the first surface to the viewer of the second surface. It is an image display transparent member which is displayed as visible as

FIG. 5 is a layer configuration diagram showing an example of the transmissive image display transparent member. 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 4, the light scattering sheet 40 is disposed between the first transparent base material 10 and the second transparent base material 20.
The first transparent substrate 10 and the light scattering sheet 40 are bonded by the adhesive layer 12, and the second transparent substrate 20 and the light scattering sheet 40 are bonded by the adhesive layer 22.

(Light scattering sheet)
The light scattering sheet 40 is disposed parallel to each other and at a predetermined distance inside the first transparent film 41; the transparent layer 42 provided on the surface of the first transparent film 41; and the transparent layer 42 It has 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 light scattering sheet 30 described above may be used.

(Transparent layer)
The transparent layer 42 is preferably a transparent resin layer.
As transparent resin which comprises a transparent resin layer, the thing similar to transparent resin which comprises the transparent resin layer of the light-scattering sheet 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 absorbing 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 4 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 absorbing material, a part of light propagating as unnecessary stray light in the image display transparent member 4 can be absorbed, and the scattered light is reduced. Therefore, the phenomenon that the image display transparent member 4 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 view seen from the viewer side and seen behind the image display transparent member 4 is also improved, and the visibility of the view 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.
The light absorbing material may, for example, be carbon black or titanium black.
0.01-10 volume% is preferable, and, as for the density | concentration of a light absorption material, 0.1-3 volume% is more preferable.

  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 light-scattering sheet 40, and the orthogonal | vertical direction to 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 4 Improve.

  The ratio of the height of the light scattering portion 43 (the direction orthogonal to the surface direction of the light scattering sheet 40) to the width of the light scattering portion 43, that is, the aspect ratio is oblique incident while maintaining the transmissivity of straight light of the scene In order to scatter the image light L with high gain, it is preferably 1 or more, more preferably 1.5 or more, and still more preferably 2 or more.

(Method of manufacturing light scattering sheet)
An example of a method of manufacturing the light scattering sheet 40 will be described with reference to FIG.

  As shown to Fig.6 (a), the photocurable resin 46 was apply | coated to the surface of the 1st transparent film 41, and several convex stripes of the cross-sectional right triangle corresponding to the light-scattering part 43 were formed in 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. 6 (b), the mold 62 is peeled off.

  As shown in FIG. 6 (c), a paste containing a photocurable resin, a light scattering material, and, if necessary, a light absorbing 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. 6D, a 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.
The light scattering sheet 40 is irradiated with light (ultraviolet rays etc.) 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 a transparent layer upper layer. 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 4 is preferably 5% or more, more preferably 10% 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 4. The above is more preferable.

The reflectance of the image display transparent member 4 is 15% or less, and more preferably 10% or less.
In the present invention, by using a short focus projector, the incident angle of the image light L on the first surface A of the image display transparent member 4 becomes large, and the region where the light amount of the image light L is strong becomes the image display transparent member 4 Can be transmitted at a large emission angle, or specularly reflected at a large emission angle on the first surface A of the image display transparent member 1 so as to be difficult to reach the observer. However, since the incident angle of the image light L becomes large, the transmitted light T reaches the floor or ceiling near the image display transparent member 4. Then, when the transmitted light T reaches the floor or ceiling, the light scattered on the floor or ceiling is reflected on the image display transparent member 4 and the reflected light is visually recognized by the observer to cause a drop in the contrast of the image. .
In the present invention, by reducing the reflectance of the image display transparent member 4 to the above degree, the light scattered on the floor or ceiling by the transmitted light T reaching the floor or ceiling is reflected to the image display transparent member 4. The amount of light captured can be reduced, and a decrease in the contrast of the image displayed on the image display transparent member 4 can be prevented. In particular, when the incident angle of the image light L at a portion farthest to the projector 200 of the image displayed on the image display transparent member 4 is 50 degrees or more, the transmitted light T is on the floor or ceiling near the image display transparent member 4 In addition to reaching, among the light scattered on the floor and the ceiling, light having an angle difference of less than 90 degrees from the normal reflection angle, which is an area with a relatively large amount of light, reaches the image display transparent member 4. The effect of

The front haze of the image display transparent member 4 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 4 is preferably 50% 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 4 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 4, 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 4 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 4 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.

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

As shown in FIG. 5, the image light L projected from the projector 200 and incident from the first surface A of the image display transparent member 4 forms an image by scattering in the light scattering portion 43, and It is displayed so as to be visible as an image to the observer Y on the opposite side.
In addition, since the gap between the light scattering portions 43 in the image display transparent member 4 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 image display system and the image display method of the present invention using the transmission type image display transparent member 4 described above, by using a short focus and short projector, even in a place deviated from the focal position in the optical axis direction. The light in the vicinity of the center of the image where the density of light quantity is high passes through the light scattering portion 43 without forming an image and the emission angle of the reflected light R specularly reflected on the first surface A of the image display transparent member The emission angle of the transmitted light T is increased. Therefore, it is difficult for the reflected light R and the transmitted light T to enter the eyes of the observer X and the observer Y, and the glare caused by the reflected light R and the transmitted light T originating from the image light L projected from the projector 200 And observer Y is hard to feel. In addition, since it is not necessary to set the degree of scattering of the first surface A and the light scattering portion 43 high in order to suppress glare, the forward haze can be 40% or less, and the observer X or the observer Y It does not reduce the visibility of the sight seen from the side of the image display transparent member 4 as seen from the side.
However, since the incident angle of the image light L on the first surface A of the image display transparent member 4 is increased by using the short focus projector, the transmitted light T reaches the floor or ceiling near the image display transparent member 4 It will be. Then, the transmitted light T reaches the floor or ceiling, and the light scattered on the floor or ceiling is reflected on the image display transparent member 4 to cause a drop in the contrast of the image. Therefore, by making the reflectance of the image display transparent member 4 15% or less, the light scattered on the floor or ceiling by the transmitted light T reaching the floor or ceiling is reflected by the image display transparent member 4 and the light amount is reflected Of the image displayed on the image display transparent member 4 can be prevented.
In addition, since the incident angle to the first surface A of the image display transparent member 4 is increased by using the short focus projector, the light scattering portion 43 scatters and the scattered light toward the observer Y is reduced and the luminance is increased. An area of decreasing occurs. Therefore, by using the image display transparent member 4 having a forward haze of 4% or more, an appropriate screen gain can be obtained in each area, and the image can be viewed regardless of the image display position of the image display transparent member 4 Will be able to

(Other embodiments)
The transparent image display transparent member in the present invention is a transparent member having a first surface and a second surface opposite to the first surface, and the view on the first surface side is a second surface side. The second surface is transparently transmitted to the observer, transmits the view on the second surface visually to the first surface, and the image light projected from the first surface is the second surface The image display transparent member may be any image display transparent member that can be displayed visually as an image to an observer of the present invention, and is not limited to the image display transparent member 4 of FIG. Hereinafter, the same components as those of the image display transparent member 4 in FIG.

The image display transparent member of the transmission type may be the image display transparent member 5 from which the first transparent base material 10 is omitted as shown in FIG. Specific examples of the image display transparent member 5 include, 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 light scattering sheet 40 is attached to the existing window glass or the like. .
In the image display transparent member 4 of FIG. 5, the second transparent base 20 may be omitted.
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, the inner surface of one of the glass plates is: The light scattering sheet 40 may be attached.

As shown in FIG. 8, the transmissive image display transparent member may be the image display transparent member 6 in which the first transparent base material 10 and the second transparent base material 20 are omitted, that is, the light scattering sheet 40 itself. Good. The image display transparent member 6 can be attached to an existing window glass or the like by using an adhesive layer. Further, the image display transparent member 6 can be deformed, and is suitable for forming an image display transparent member having a curved surface.
Further, in the image display transparent member 6 of FIG. 8, the first transparent film 41 and the second transparent film 45 may be replaced with the first transparent substrate 10 and the second transparent substrate 20. .

In the light scattering sheet, 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 transparent image display transparent member, an anti-reflection film may be provided on one or both of the first surface and the second surface.

In the transmission type image display transparent member, 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 it may be another triangle, trapezoid, bell shape, etc. Good.
Other examples of the light scattering sheet include those which are transmitted, deflected and diffused by volume holograms, and those which are deflected, scattered and diffused depending on the configuration in which the uneven surface is formed, such as a kinoform type hologram.

Further, as the light scattering sheet, light scattering fine particles are dispersed throughout the transparent layer without providing a plurality of light scattering portions as shown in the example in the transparent layer, and the transparent layer itself is made a light scattering layer. 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 include a light absorbing material for the reasons described above. The concentration of the light absorbing material is preferably 0.01 to 5% by volume, and more preferably 0.1 to 3% by volume.

EXAMPLES The present invention will be described in more detail using the following examples, but the present invention is not limited to these examples.
Examples 1, 3 and 4 are examples, and examples 2 and 5 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, Inc., E20, arithmetic average roughness Ra: 0.23 μm) having an irregular uneven structure formed on the surface, such that the uneven structure is in contact with the ultraviolet-curable resin I put it on top.

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 light scattering sheet of Example 1 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 (Matsunami Glass Co., Ltd., thickness: 3 mm), polyvinyl butyral (hereinafter referred to as PVB) film (Solutia Saflex RK 11 l, thickness: 375 μm), light scattering sheet 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.

As a projector, a short focus projector (manufactured by RICOH, PJ WX4141NI) was prepared.
As shown in FIG. 1, the first portion of the image display transparent member 1 is set so that the incident angle α of the image light to the first surface A of the image display transparent member 1 at the portion closest to the projector 200 is 26 degrees. It was installed on side A of 1. The projection distance of the image light was 18.8 cm at the shortest.

  Image light was projected from the projector 200 onto the image display transparent member 1 to display an image. The observer X observed the first surface A of the image display transparent member 1 from the front and at a distance of 3 m. The observer Y observed the second surface B of the image display transparent member 1 from the front and at a distance of 3 m. The observer X and the observer Y did not feel the glare caused by the reflected light R and the transmitted light T originating from the image light L projected from the projector 200. In addition, the luminance unevenness of the image was suppressed.

(Example 2)
As a projector, an ordinary projector (manufactured by EPSON, LCD PROJECTOR EB-X8) is prepared, and the same as Example 1 is carried out except that the incident angle α is changed to 10 degrees and the projection distance (shortest) of image light is changed to 100 cm. The image was displayed on the image display transparent member. Glare due to the reflected light R and the transmitted light T originating from the image light L projected from the projector 200 was felt by the observer X and the observer Y.

(Example 3)
A light scattering sheet of Example 3 was obtained in the same manner as in Example 1 except that a white PET film having an irregular uneven structure formed on the surface and having an arithmetic average roughness Ra of 0.02 μm was used.
A reflective image display transparent member of Example 3 was obtained in the same manner as in Example 1 except that the light scattering sheet of Example 3 was used instead of the light scattering sheet of Example 1. The evaluation results of the image display transparent member of Example 3 are shown in Table 1.

  An image was displayed on the image display transparent member in the same manner as in Example 1 except that the transmission type image display transparent member of Example 3 was used instead of the reflection type image display transparent member of Example 1. The observer X and the observer Y did not feel the glare caused by the reflected light R and the transmitted light T originating from the image light L projected from the projector 200. However, the uneven brightness of the image appeared notably.

(Example 4)
On the surface of transparent PET film (Toyobo Co., Ltd., Cosmo Shine (registered trademark) A4300, thickness: 50 μm), a UV curable resin (Hitachi Chemical Co., Ltd., Hytaloid (registered trademark) 7981, specific gravity 1.1) is blade coated It applied so that thickness might be set to 80 micrometers by a method.
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 was irradiated from the side of the transparent PET film to cure the ultraviolet curable resin, and a groove corresponding to the convex line of the mold was formed on the surface to form a transparent layer lower layer, and then the mold was 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.

An ultraviolet curable resin (Hitaloid (registered trademark) 7981 manufactured by Hitachi Chemical Co., Ltd., specific gravity 1.1) is applied on the surface of the lower layer surface of the transparent layer and the surface of the light scattering portion by die coating to a thickness of 5 μm. A transparent PET film was overlaid on the curable resin.
The light scattering sheet of Example 4 was obtained by irradiating ultraviolet rays and curing the ultraviolet curable resin to form a transparent layer upper layer.

  Soda lime glass plate (Matsunami Glass Co., Ltd., thickness: 3 mm), PVB film (Solutia Saflex RK 11 l, thickness: 375 μm), light scattering sheet of Example 4, PVB film (thickness: 375 μm), soda lime glass It laminated | stacked in order of board (thickness: 3 mm), vacuum-heat-pressing was performed, and the transmission type image display transparent member of Example 4 was obtained. The evaluation results of the image display transparent member of Example 4 are shown in Table 1.

  An image was displayed on the image display transparent member in the same manner as in Example 1 except that the transmission type image display transparent member of Example 4 was used instead of the reflection type image display transparent member of Example 1. The observer X and the observer Y did not feel the glare caused by the reflected light R and the transmitted light T originating from the image light L projected from the projector 200.

(Example 5)
An image was displayed on the image display transparent member in the same manner as in Example 2 except that the transmission type image display transparent member of Example 4 was used instead of the reflection type image display transparent member of Example 1. Glare due to the reflected light R and the transmitted light T originating from the image light L projected from the projector 200 was felt by the observer X and the observer Y.

The evaluation criteria in the table are as follows.
(Sight visibility)
The visibility of the view seen from the image display transparent member as viewed from the viewer side (viewer X in the case of the reflection type and observer Y in the case of the transmission type) was evaluated according to the following criteria.
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)
The visibility of the image displayed on the image display transparent member as viewed from the viewer side (viewer X in the reflection type and the viewer Y in the transmission type) 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.

  The image display system of the present invention is a system for displaying an image on a transparent member used for a display case such as a product; a display case for an art object etc .; a window for a building, a showroom, a vehicle etc; a glass door; It is useful. 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. The present invention is useful as a system for displaying image light projected from an image so as to be visible to a viewer as an image.

1 to 6 image display transparent member 10 first transparent base 12 adhesive layer 20 second transparent base 22 adhesive layer 30 light scattering sheet 31 first transparent film 32 first transparent layer 33 reflective film 34 second Transparent layer 35 Second transparent film 36 Photocurable resin 37 Photocurable resin 40 Light scattering sheet 41 First transparent film 42 Transparent layer 42a Transparent layer lower layer 43 Light scattering portion 44 Groove 45 Second transparent film 46 Light curing Resin 47 light curable resin 48 paste 61 mold 62 mold 101 image display transparent member 102 image display transparent member 110 first transparent base 120 second transparent base 132 first transparent layer 133 reflective film 134 second Transparent layer 142 Transparent layer 143 Light scattering portion 200 Projector A First surface B Second surface L Image light R Reflected light T Transmitted light X Observer Y View Who α angle of incidence

Claims (16)

A transparent member having a first surface and a second surface opposite to the first surface, which transmits the view on the first surface visibly to the viewer on the second surface, and the second surface Is visible to the viewer on the first surface side, and video light projected from the projector installed on the first surface can be viewed as a video to the viewer on the first surface side A reflective image display transparent member to be displayed on the
And a projector installed on the first surface side of the image display transparent member, the image display system comprising:
The projector is a short focus projector,
The transmittance of the image display transparent member is 5 to 80 %,
The reflectance of the image display transparent member is 18% or more,
The rear haze of the image display transparent member is 5 to 80%,
The video display system whose front haze of the said video display transparent member is 50% or less. 2. The image display transparent member according to claim 1, wherein an incident angle of the image light to the first surface of the image display transparent member at a portion closest to the projector of the image displayed on the image display transparent member is 15 to 60 degrees. Video display system. The image display transparent member has a first transparent layer having a concavo-convex structure on the surface, between the first surface and the second surface,
The image display system according to claim 1, wherein an arithmetic mean roughness Ra of the concavo-convex structure of the first transparent layer is 0.01 to 20 μm.   The image transmission transparent member is formed between the first surface and the second surface along the surface on the uneven structure side of the first transparent layer, and transmits part of incident light. The image display system according to claim 3, further comprising a film and a second transparent layer provided to cover the surface of the reflective film.   The image display system according to claim 3, wherein the uneven structure of the surface of the first transparent layer in the image display transparent member is an irregular uneven structure. A transparent member having a first surface and a second surface opposite to the first surface, which transmits the view on the first surface visibly to the viewer on the second surface, and the second surface Is visible to the viewer on the first surface side, and the image light projected from the projector installed on the first surface can be viewed as the image to the viewer on the second surface side A transparent image display transparent member to be displayed on the
And a projector installed on the first surface side of the image display transparent member, the image display system comprising:
The projector is a short focus projector,
The transmittance of the image display transparent member is 5% or more,
The reflectance of the image display transparent member is 15% or less,
The image display system whose front haze of the said image | video display transparent member is 8 to 40%. At the portion closest to the projector of the image displayed on the image display transparent member, an incident angle of the image light to the first face of the image display transparent member is 15 to 60 degrees, according to claim 6 Video display system.   A plurality of the image display transparent members, which are disposed between the first surface and the second surface, parallel to each other, at predetermined intervals, in the transparent layer and in the transparent layer, and extending along the surface direction The image display system according to claim 6 or 7, further comprising: A transparent member having a first surface and a second surface opposite to the first surface, which transmits the view on the first surface visibly to the viewer on the second surface, and the second surface Is a reflective type that transmits the view of the first surface visibly to the observer on the first surface side and displays the image light projected from the first surface side visibly to the observer on the first surface side as an image In the image display transparent member,
A method of projecting an image light from a projector installed on the first surface side of the image display transparent member to display an image,
The projector is a short focus projector,
The transmittance of the image display transparent member is 5 to 80 %,
The reflectance of the image display transparent member is 18% or more,
The rear haze of the image display transparent member is 5 to 80%,
The image display method, wherein the forward haze of the image display transparent member is 50% or less. 10. The image display transparent member according to claim 9, wherein an incident angle of the image light to the first surface of the image display transparent member at a portion closest to the projector of the image displayed on the image display transparent member is 15 to 60 degrees. Video display method. The image display transparent member has a first transparent layer having a concavo-convex structure on the surface, between the first surface and the second surface,
The image display method according to claim 9, wherein an arithmetic average roughness Ra of the concavo-convex structure of the first transparent layer is 0.01 to 20 μm.   The image transmission transparent member is formed between the first surface and the second surface along the surface on the uneven structure side of the first transparent layer, and transmits part of incident light. The image display method according to claim 11, further comprising a film and a second transparent layer provided to cover the surface of the reflective film.   The image display method according to claim 11, wherein the concavo-convex structure of the surface of the first transparent layer in the image display transparent member is an irregular concavo-convex structure. A transparent member having a first surface and a second surface opposite to the first surface, which transmits the view on the first surface visibly to the viewer on the second surface, and the second surface Is transmissive to visibly transmit to the viewer on the first surface side, and the image light projected from the first surface is visibly displayed to the viewer on the second surface side as an image In the image display transparent member,
A method of projecting an image light from a projector installed on the first surface side of the image display transparent member to display an image,
The projector is a short focus projector,
The transmittance of the image display transparent member is 5% or more,
The reflectance of the image display transparent member is 15% or less,
The image display method as described above, wherein the forward haze of the image display transparent member is 8 to 40%. At the portion closest to the projector of the image displayed on the image display transparent member, an incident angle of the image light to the first face of the image display transparent member is 15 to 60 degrees, according to claim 14 Video display method.   A plurality of the image display transparent members, which are disposed between the first surface and the second surface, parallel to each other, at predetermined intervals, in the transparent layer and in the transparent layer, and extending along the surface direction The image display method according to claim 14 or 15, further comprising:

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