WO2015199026A1

WO2015199026A1 - Transparent member for image display, image display system, and image display method

Info

Publication number: WO2015199026A1
Application number: PCT/JP2015/067881
Authority: WO
Inventors: 賢太関川; 幸宏垰; 海田　由里子; 研一江畑; 一志辻村
Original assignee: 旭硝子株式会社
Priority date: 2014-06-23
Filing date: 2015-06-22
Publication date: 2015-12-30
Also published as: JP2020166290A; JP6725029B2; JP7192829B2; JP6508205B2; JPWO2015199026A1; JP2019124956A

Abstract

The purpose of the present invention is to provide a transparent member for image display through which a scene on the other side of the transparent member is highly visible to an observer and an image display system and image display method using the same. Provided is a transparent member for image display that has a first surface (A) and a second surface (B) on the opposite side from the first surface (A), transmits a scene from the first-surface (A) side so as to be visible to an observer (Y) on the second-surface (B) side, transmits a scene from the second-surface (B) side so as to be visible to an observer (X) on the first-surface (A) side, and displays image light projected from the first-surface (A) side so as to be visible as an image to the observer (X) on the first-surface (A) side, said transparent member for image display having a light attenuation layer for attenuating a portion of the light transmitted by the transparent member for image display. Also provided are an image display system and image display method using the transparent member for image display (1).

Description

Video display transparent member, video display system, and video display method

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

Showcases for products, etc .; display cases for works of art, etc .; windows for buildings, showrooms, vehicles, etc .; glass doors;
The viewer can see the scene seen from the other side of the transparent member when viewed from the observer side, and when transmitting information such as the description of products, the state of various devices, destination guidance, transmission items, etc. to the observer On the other hand, when displaying the operation screens of various devices, or when making it impossible for the observer to see the scene behind the transparent member for privacy protection, security, etc., the image projected from the projector An image display transparent member (so-called transparent screen) that displays light as a visual image to an observer.

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

As the reflective image display transparent member, for example, a regular uneven structure (microlens) on the surface between the first transparent substrate 110 and the second transparent substrate 120 as shown in FIG. The first transparent layer 132 on which the array) is formed, the reflective film 133 that is formed along the surface of the first transparent layer 132 on the concave-convex structure side, and transmits a part of the incident light, and the reflective film A video display transparent member 101 having a second transparent layer 134 provided so as to cover the surface of 133 is proposed (see Patent Document 1).

In the reflective image display transparent member 101, as shown in FIG. 19, the image light L projected from the projector 200 and incident from the surface on the second transparent substrate 120 side (first surface A) is An image is formed by scattering on the reflecting film 133 and is displayed as an image that can be viewed by the viewer X on the same side as the projector 200. The video display transparent member 101 has high transparency (low haze), high visibility of the scene, and high screen gain of the video.
In addition, the viewer on the same side as the projector 200 and the viewer Y on the opposite side of the projector 200 can see the scene on the other side of the image display transparent member 101 when viewed from the viewer side.

However, the reflection-type image display transparent member 101 has a problem that visibility of a scene beyond the image display transparent member 101 is lowered when viewed from the observer. Specifically, the other side of the image display transparent member 101 is reflected and scattered by the sun or illumination light incident on the image display transparent member 101 from the viewer side who is looking at the scene on the other side and scattered by the reflection film 133. As a result, the contrast of the light transmitted through the image display is reduced, and the visibility of the scene beyond the image display transparent member 101 is reduced.
For example, when the reflective image display transparent member 101 is used for a window, the window looks white and blurred from the observer Y who is outside the window due to the reflected scattered light in which sunlight L1 is scattered by the reflection film 133 during the day. The visibility of the scene inside the window is reduced. Also, in this case, at night, the window L looks white and blurred from the observer X in the room due to the reflected scattered light in which the illumination light L2 is scattered by the reflection film 133, and the visibility of the scene outside the window is lowered.

As the transmissive image display transparent member, for example, as shown in FIG. 20, the transparent layer 142 and the inside of the transparent layer 142 are disposed between the first transparent substrate 110 and the second transparent substrate 120. A video display transparent member 102 having a plurality of light scattering portions 143 extending in the plane direction and arranged in parallel to each other at a predetermined interval has been proposed (see Patent Document 2).

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

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

JP 2010-539525 A JP 2014-013369 A

The present invention provides an image display transparent member that has an improved visibility of the scene beyond the transparent member as viewed from the observer and has excellent visibility, and an image display system and an image display method using the same.

The present invention has the following configuration.
[1] It has a first surface and a second surface opposite to the first surface, and transmits a scene on the first surface side so as to be visible to an observer on the second surface side. The image light projected from the projector installed on the first surface side is transmitted to the viewer on the first surface side and the second surface view so that the viewer of the first surface side is visible. An image display transparent member that is visibly displayed as an image on one of the surface side observers,
The video display transparent member has a light attenuating layer that attenuates part of light transmitted through the video display transparent member.
[2] The image display transparent member according to [1], wherein the light attenuation layer has polarization dependency.
[3] The image display transparent member according to [1] or [2], wherein the transmittance of the light attenuation layer is 70% or less.
[4] The light attenuating layer is gray (uniform throughout the visible light (0.25 to x to 0.4, 0.25 to y to 0.4 in the xyY color system)) [1 ] The image display transparent member according to any one of [3] to [3].
[5] The video display transparent member according to any one of [1] to [3], wherein the light attenuation layer is bluish (x to 0.33, y to 0.5 in the xyY color system).
[6] The image display transparent member according to any one of [1] to [3], wherein the light attenuating layer has a green color (y> x, 0.33 to y in the xyY color system).
[7] The image display transparent member according to any one of [1] to [3], wherein the light attenuation layer is a half mirror.
[8] The image display transparent member according to any one of [1] to [7], wherein the forward haze is 50% or less.
[9] It is a reflective type that displays the image light projected from the first surface side to the viewer on the first surface side so as to be visible as an image,
The forward haze is 20% or less,
Back haze is 5% or more,
The video display transparent member according to any one of [1] to [8], wherein the ratio of the rear haze to the front haze (rear haze / front haze) is 1 or more.
[10] It is a reflective type that displays the image light projected from the first surface side to the viewer on the first surface side so as to be visible as an image,
Between the first surface and the second surface,
A first transparent layer having an uneven structure on the surface;
A reflective film that is formed along the surface of the first transparent layer on the concave-convex structure side and transmits a part of incident light;
A second transparent layer provided to cover the surface of the reflective film;
The image display transparent member according to any one of [1] to [9], comprising an image display unit having
[11] The image display transparent member according to [10], wherein the uneven structure on the surface of the first transparent layer is an irregular uneven structure.
[12] The video display transparent member according to [10] or [11], wherein the area of the light attenuation layer is the same as or larger than the area of the video display unit.
[13] The image display transparent member is a transmission type that displays the image light projected from the first surface side so as to be visible to the observer on the second surface side as an image,
The image display transparent member according to any one of [1] to [8], wherein the forward haze is 4 to 40%.
[14] The image display transparent member is a transmission type that displays the image light projected from the first surface side so that the image light can be visually recognized by an observer on the second surface side,
Between the first surface and the second surface,
A transparent layer,
A plurality of light scattering portions extending in the plane direction, arranged in parallel to each other at a predetermined interval inside the transparent layer;
The image display transparent member according to any one of [1] to [8] or [13].
[15] The image display transparent member of any one of [1] to [14],
A projector installed on the first surface side of the image display transparent member;
A video display system with
[16] The image display transparent member of any one of [1] to [14]
A video display method for displaying video by projecting video light from a projector installed on the first surface side of the video display transparent member.

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

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

The following definitions of terms apply throughout this specification and the claims.
The “first surface” means the outermost surface of the image display transparent member and the surface on the side where 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 scene on the first surface side (second surface side)” means the other side of the image display transparent member as viewed from the observer on the second surface side (first surface side) of the image display transparent member. It means an image (a main object (a product, a work of art, a person, etc.) and its background, a landscape, etc.) that is visible to the side. The scene does not include an image in which the image light projected from the projector is imaged and displayed on the image display transparent member.
“Forward haze” refers to incident light caused by forward scattering among transmitted light transmitted from the first surface side to the second surface side or transmitted light transmitted from the second surface side to the first surface side. The percentage of transmitted light deviating from 0.044 rad (2.5 °) or more. That is, it is a normal haze measured by the method described in JIS K 7136: 2000 (ISO 14782: 1999).
“Backward haze” means the percentage of the reflected light that is reflected on the first surface and that is 0.044 rad (2.5 °) or more away from the regular reflected light due to scattering.
“Uneven structure” means a plurality of protrusions, a plurality of recesses, or an uneven shape composed of a plurality of protrusions and recesses.
The “irregular concavo-convex structure” means a concavo-convex structure in which convex portions or concave portions do not appear periodically and the sizes of the convex portions or concave portions are irregular.
The arithmetic average roughness (Ra) is an arithmetic average roughness measured based on JIS B 0601: 2013 (ISO 4287: 1997, Amd. 1: 2009). The reference length lr (cut-off value λc) for the roughness curve was 0.8 mm.
The transmittance is a value in which the ratio of the total amount of light transmitted and scattered in the forward direction with respect to the incident light is a percentage.
The reflectance is a value in which the ratio of the total amount of light reflected and scattered in the backward direction with respect to incident light is a percentage.
The transmittance, reflectance and refractive index are values measured at room temperature using d-line (wavelength 589 nm) of a sodium lamp.

<Reflective video display transparent member>
The first aspect of the image display transparent member of the present invention has a first surface and a second surface opposite to the first surface, and gives a scene on the first surface side to an observer on the second surface side. The first surface side observer transmits image light projected from the first surface side and transmitted through the second surface side so as to be visible to the first surface side observer. A video display transparent member that is visibly displayed as a video, the video display transparent member having a light attenuation layer for attenuating a part of the light transmitted through the video display transparent member. It is a member.

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

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

Examples of the transparent resin constituting the first transparent substrate 10 include polycarbonate, polyester (polyethylene terephthalate, polyethylene naphthalate, etc.), triacetyl cellulose, cycloolefin polymer, polymethyl methacrylate, etc., and weather resistance and transparency. From the viewpoint, polycarbonate, polyester, and cycloolefin polymer are preferable.

As the first transparent substrate 10, one having no birefringence is preferable.
The thickness of the 1st transparent base material 10 should just be the thickness by which durability as a base material is maintained. The thickness of the transparent substrate may be, for example, 0.01 mm or more, 0.05 mm or more, and 0.1 mm or more. Further, the thickness of the transparent substrate may be, for example, 10 mm or less, 5 mm or less, 0.5 mm or less, 0.3 mm or less, and 0.15 mm or less. It's okay.

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

Examples of the material of the second transparent substrate 20 include those in which a light attenuation component is blended with the glass, the transparent resin, or the like mentioned as the material of the first transparent substrate 10.
Examples of the light attenuation component contained in the glass include Fe ₂ O ₃ , CoO, Ti ₂ O, V ₂ O ₅ , CuO, Cr ₂ O ₃ , NiO, Er ₂ O ₃ , Nd ₂ O ₃ , CeO ₂ , Examples thereof include metal oxides such as MnO ₂ and SeO _x , and Fe and Cu are preferably included from the viewpoint of imparting functions such as infrared cut.
Examples of the light attenuating component contained in the transparent resin include pigments such as carbon black and titanium black and dyes such as azine compounds, and pigments are preferred from the viewpoint of weather resistance.

The second transparent substrate 20 may have polarization dependency. For example, out of the amount of light included in the image light L from the projector, the polarization direction of much light is aligned with the polarization direction on the side where the second transparent substrate 20 attenuates more. Thereby, it is possible to efficiently absorb the image light L while having high transmittance, and to improve the visibility of the scene of the observer Y.
Examples of the light attenuating component having polarization dependency include dichroic dyes and metal nanorods. In addition, the second transparent substrate having polarization dependency can also be created by stretching a transparent resin containing iodine, dye, silver or the like. Moreover, you may use what formed the wire grid structure in the surface of the 2nd transparent base material 20, and provided polarization | polarized-light dependence. As the polarization dependency, if the transmittance ratio is 2 or more, it is preferable that the difference from the light attenuating material having no polarization dependency is felt as the brightness of the scene, and more preferably 5 or more. 10 or more is particularly preferable.

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

As the color of the second transparent base material 20 of the light attenuation layer, it is preferable to use a gray color that uniformly attenuates light because the contrast of a scene and a projected image can be improved. Preferred ranges are 0.25 to x to 0.4, 0.25 to y to 0.4, and 0.27 to x to 0.38, 0.27 to y in the xyY color system. It is preferable that it is ~ 0.38.

When the color of the second transparent substrate 20 of the light attenuation layer is bluish, it is preferable because the visibility of the scene is improved. Preferred ranges are x to 0.33 and y to 0.5 in the xyY color system.

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

In the present invention, as shown in FIG. 1, the area of the second transparent substrate 20 that is a light attenuation layer is the same as the area of the image display unit 30, or the area of the second transparent substrate 20 that is a light attenuation layer is the same. It is preferable that the area is larger than the area of the video display unit 30. As a result, a part of the reflected and scattered light, which is scattered from the later-described reflecting film of light (sunlight or the like) incident from the viewer Y side, is stably absorbed by the light attenuation layer. Therefore, a decrease in contrast of the scene on the other side of the image display transparent member as viewed from the viewer Y is stably suppressed, and excellent visibility of the scene on the other side of the image display transparent member 1 is easily realized stably. Become.

As the 2nd transparent base material 20, what does not have birefringence is preferable.
The thickness of the 2nd transparent base material 20 should just be the thickness by which durability as a base material is maintained. The thickness of the transparent substrate may be, for example, 0.01 mm or more, 0.05 mm or more, and 0.1 mm or more. Further, the thickness of the transparent substrate may be, for example, 10 mm or less, 5 mm or less, 0.5 mm or less, 0.3 mm or less, and 0.15 mm or less. It's okay.

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

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

The thickness of the adhesive layer is not particularly limited as long as the function as the adhesive layer is maintained. For example, 0.01 to 1.5 mm is preferable, and 0.05 to 1 mm is more preferable.

(Video display section)
The video display unit 30 includes a first transparent film 31; a first transparent layer 32 provided on the surface of the first transparent film 31 and having an irregular uneven structure on the surface; and a first transparent layer 32. A reflective film 33 that is formed along the surface of the concave-convex structure side and transmits a part of incident light; a second transparent layer 34 provided so as to cover the surface of the reflective film 33; The light-scattering sheet | seat which has the 2nd transparent film 35 provided in the surface of the transparent layer 34 of this.

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

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

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

As the transparent resin constituting the transparent resin layer, a cured product of a photocurable resin (such as an acrylic resin or an epoxy resin), a cured product of a thermosetting resin, or a thermoplastic resin is preferable. The yellow index of the transparent resin constituting the transparent resin layer is preferably 10 or less and 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 any thickness that can be easily formed by a roll-to-roll process, and is preferably 0.5 to 50 μm, for example.
The transmittance of the transparent layer is preferably 50 to 100%, more preferably 75 to 100%, and still more preferably 90 to 100%.

The arithmetic average roughness Ra of the irregular uneven structure formed on the surface of the first transparent layer 32 is preferably 0.01 to 20 μm, and more preferably 0.05 to 10 μm. If the arithmetic average roughness Ra is within this range, the projected image has a wide viewing angle, and can be viewed without directly viewing the specularly reflected light, thereby suppressing graininess due to the uneven structure. If the arithmetic average roughness Ra is 10 μm or less, the uneven structure does not get in the way when viewing the scene on the other side of the image display transparent member 1 and is more preferable.

(Reflective film)
The reflection film 33 may be any film that transmits part of the light incident on the reflection film 33 and reflects the other part. Examples of the reflective film 33 include a metal film, a semiconductor film, a dielectric single layer film, a dielectric multilayer film, and combinations thereof.

As the metal constituting the metal film and the semiconductor film, Al, Ag, Ni, Cr, W, Si, and the like can be considered, and Al, Ag, or an alloy containing them as a main component is particularly 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 structure in which an oxide film, a metal thin film, and an oxide film are laminated in this order.

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

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

As shown in FIG. 2 (a), a mold 61 in which an irregular concavo-convex structure is formed on the surface by applying a photocurable resin 36 to the surface of the first transparent film 31, and the concavo-convex structure is photocurable. The photo-curing resin 36 is overlaid so as to be in contact with the resin 36.

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

As shown in FIG. 2C, a metal is physically vapor-deposited on the surface of the first transparent layer 32 to form a reflective film 33 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 the second transparent film 35 is overlaid on the photocurable resin 37.
By irradiating light (such as ultraviolet rays) from the first transparent film 31 side or the second transparent film 35 side and curing the photo-curable resin 37 to form the second transparent layer 34, The display unit 30 is obtained.

Examples of the mold 61 include a resin film, a metal plate, and the like on which an irregular uneven structure is formed on the surface. Examples of the resin film having an irregular concavo-convex structure formed on the surface include a resin film containing fine particles and a resin film that has been sandblasted.
Examples of the photocurable resin coating method include a die coating method, a blade coating method, a gravure coating method, a spin coating method, an ink jet method, and a spray coating method.
Examples of physical vapor deposition include vacuum vapor deposition and sputtering.

(Optical characteristics of reflective video display transparent member)
The transmittance of the image display transparent member 1 is preferably 3% or more, more preferably 5% or more, more preferably 10% from the viewpoint of good visibility of a scene seen from the other side of the image display transparent member 1 when viewed from the observer side. The above is more preferable.
The transmittance of the image display transparent member 1 is preferably 60% or less, more preferably 40% or less, still more preferably 30% or less, and particularly preferably 20% or less from the viewpoint of appropriately maintaining the contrast of the projected image.

The forward haze of the image display transparent member 1 is preferably 50% or less, more preferably 20% or less, and more preferably 10%, from the viewpoint of good visibility of the scene seen from the viewer side. The following is more preferable.

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

The ratio of the rear haze to the front haze (rear haze / front haze) is preferably 0.5 or more, and more preferably 1 or more. If the back haze / forward haze is 1 or more, even if there is an environment of 100 lux or more in the range where the observer's line of sight viewing the image display transparent member 1 can reach, it is beyond the image display transparent member 1 when viewed from the observer side. The visibility of the sight seen on the side is good, and the projected image and the sight on the other side of the image display transparent member 1 can be seen. Such a video display transparent member 1 is suitable for being used in an environment where ambient light exists.

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

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

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

The projector 200 may be anything that can project the image light L onto the image display transparent member 1. Examples of the projector 200 include a known projector.

(Video display method using a reflective video display transparent member)
According to a first aspect of the image display method of the present invention, image light is projected from a projector installed on the first surface side of the image display transparent member onto the reflective image display transparent member of the present invention. This is a video display method to be displayed.

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

(Mechanism of action)
In the reflective video display transparent member 1 described above, and the video display system and video display method using the same, for example, the video display transparent member 1 is used as a window so that the second surface B is outdoor. In this case, the sunlight L1 incident on the image display transparent member 1 from the second surface B side is scattered by the reflective film 33, and a part of the reflected scattered light is the second transparent base material 20 which is a light attenuation layer. It is absorbed and decreases. As a result, when the viewer Y views the scene on the other side of the image display transparent member 1, the contrast of light transmitted from the other side of the image display transparent member 1 is improved. Therefore, the contrast of the scene on the other side of the image display transparent member 1 as viewed from the observer Y is improved, and the visibility of the scene during the day is excellent.
Further, the absorption of the reflected scattered light by the second transparent base material 20 that is a light attenuation layer suppresses the video display transparent member 1 from appearing white and blurred when viewed from the second surface B side. Excellent design. Therefore, the image display transparent member 1 is useful for applications such as a window having the second surface B as the outdoor side.

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

(Other embodiments)
The reflective image display transparent member of the present invention has a first surface and a second surface opposite to the first surface, and gives a scene on the first surface side to an observer on the second surface side. The first surface side observer transmits image light projected from the first surface side and transmitted through the second surface side so as to be visible to the first surface side observer. A video display transparent member that is visibly displayed as an image, as long as the video display transparent member has a light attenuation layer that attenuates part of the light transmitted through the video display transparent member. The video display transparent member 1 is not limited to one. Hereinafter, the same components as those of the video display transparent member 1 of FIG.

As shown in FIG. 3, the reflective video display transparent member of the present invention may be a video display transparent member 2 in which the first transparent substrate 10 is omitted. Specific examples of the video display transparent member 2 include an example in which the second transparent substrate 20 is an existing window glass or the like, that is, an example in which the video display unit 30 is pasted on an existing window glass or the like. .
In addition, in a multi-layer glass having two glass plates and a frame-shaped spacer disposed so as to form a gap between the glass plates, one glass plate is a colored glass plate In addition, the video display unit 30 may be attached to the inner surface of one of the glass plates.

As shown in FIG. 4, the reflective video display transparent member of the present invention is colored with a light attenuation component blended in place of the first transparent base material 10, and a part of the light transmitted through the transparent member. An image having a first transparent base material 10A that serves as a light attenuation layer to be attenuated, and having a second transparent base material 20A that is not colored and does not contain a light attenuation component, instead of the second transparent base material 20. The display transparent member 1A may be used.
Examples of the first transparent base material 10 A that is colored by mixing the light attenuation component include the same as the second transparent base material 20 of the video display transparent member 1. As the 2nd transparent base material 20A which is not mix | blended and is not colored with a light attenuation component, the same thing as the 1st transparent base material 10 of the image display transparent member 1 is mentioned.

In the video display transparent member 1A, for example, when the video display transparent member 1A is used as a window so that the second surface B is outdoor, the illumination light L2 incident on the video display transparent member 1A from the first surface A side is generated. A part of the reflected scattered light scattered by the reflective film 33 is absorbed by the first transparent base material 10A, which is a light attenuation layer, and decreases. As a result, when the observer on the first surface A side views the scene on the other side of the image display transparent member 1A, the contrast of light transmitted from the other side of the image display transparent member 1A is improved. Therefore, the contrast of the scene on the other side of the image display transparent member 1A as viewed from the observer on the first surface A side is improved, and the visibility of the scene at night is excellent.
In this example, the first transparent base material in which part of the reflected scattered light obtained by scattering the image light projected from the projector 200 (not shown) on the first surface A side by the reflective film 33 is a light attenuation layer. By absorbing at 10A, the gain of the image is lower than when there is no light attenuation layer. This can be dealt with by increasing the amount of image light from the projector 200.
In addition, when a light-attenuating material having polarization dependency is used, the visibility of the scene can be improved while suppressing a decrease in gain by aligning the direction of polarization with the projection light L (not shown). This is preferable.

As shown in FIG. 5, the reflective video display transparent member of the present invention has a first transparent base material 10 and a second transparent base material 20 A that are not colored without any light attenuation component. A light attenuating layer 50 is disposed on the surface of the second transparent substrate 20A opposite to the image display unit 30 so that a light attenuating component is blended and colored and a part of the light transmitted through the transparent member is attenuated. The image display transparent member 3 may be used. The second transparent base material 20 A and the light attenuation layer 50 are bonded by an adhesive layer 52.

Examples of the light attenuating layer 50 include a colored transparent film colored by blending a light attenuating component. The colored transparent film may be a colored transparent resin film colored with a light attenuating component, or a thin colored glass film colored with a light attenuating component, and a thin film having a large extinction coefficient. It may be a material.
Examples of the transparent resin of the colored transparent resin film constituting the light attenuation layer 50 include polycarbonate, polyester (polyethylene terephthalate, polyethylene naphthalate, etc.), cycloolefin polymer, polymethyl methacrylate, and the like.
Examples of the light attenuating component in the light attenuating layer 50 include pigments such as carbon black and titanium black and dyes such as azine compounds, and pigments are preferred from the viewpoint of weather resistance.
Examples of the thin film material having a large extinction coefficient in the light attenuation layer 50 include oxides such as Cr, Mo, W, Fe, Al, and Si, and carbon-based materials such as graphene and DLC.
In the case of imparting polarization dependency to the light attenuating layer 50, dichroic dyes, nanorods such as metals, etc., those obtained by stretching iodine, Ag, etc., those obtained by obliquely depositing an absorbing thin film, and the like can be mentioned.

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

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

As shown in FIG. 6, the reflective image display transparent member of the present invention omits the first transparent base material 10 and the second transparent base material 20, and the second transparent film 35 of the video display unit 30. 4A of image display transparent members which have arrange | positioned the light attenuation layer 50 on the surface may be sufficient. In the video display transparent member 4A, for the same reason as the video display transparent member 1, the contrast of the scene on the other side of the video display transparent member 4A is improved when viewed from the observer on the second surface B side, and the scene is visually recognized. Excellent in properties. Moreover, it is excellent in the visibility of the image | video by the image light projected from the projector 200 (illustration omitted) of the 1st surface A side seeing from the observer of the 1st surface A side.
Further, as shown in FIG. 7, an image in which the first transparent base material 10 and the second transparent base material 20 are omitted and a light attenuation layer 50 is disposed on the surface of the first transparent film 31 of the image display unit 30. The display transparent member 4B may be used. In the video display transparent member 4B, for the same reason as the video display transparent member 1A, the contrast of the scene on the other side of the video display transparent member 4B is improved when viewed from the observer on the first surface A side, and the scene is visually recognized. Excellent in properties.

The video display

transparent members

4A and 4B can be attached to an existing window glass or the like using an adhesive layer. The video display

transparent members

4A and 4B can be deformed and are suitable for forming a video display transparent member having a curved surface.
In addition, the image display

transparent members

4A and 4B in FIGS. 6 and 7 may include image display units in which the first transparent film 31 and the second transparent film 35 are replaced with transparent substrates, respectively.

As shown in FIG. 8, the reflective image display transparent member of the present invention has a first transparent base material 10 A and a second transparent base material 20 that are both colored with a light attenuation component. The transparent member 1B may be used.
In the video display transparent member 1B, for the same reason as the video display transparent member 1, the contrast of the scene on the other side of the video display transparent member 1B is improved when viewed from the observer on the second surface B side, and the scene is visually recognized. Excellent in properties. Moreover, it is excellent in the visibility of the image | video by the image light projected from the projector 200 (illustration omitted) of the 1st surface A side seeing from the observer of the 1st surface A side. Further, for the same reason as the image display transparent member 1A, the contrast of the scene on the other side of the image display transparent member 1B is improved when viewed from the observer on the first surface A side, and the visibility of the scene is excellent.

As shown in FIG. 9, the reflection type image display transparent member of the present invention includes a first transparent base material 10 and a second transparent base material 20A which are not blended and are not colored. This is a video display transparent member 1C having a video display portion 30A which is a light attenuation layer which is colored by mixing a light attenuation component in the second transparent film 35A and attenuates part of the light transmitted through the transparent member. May be.
In the video display transparent member 1C, for the same reason as the video display transparent member 1, the contrast of the scene on the other side of the video display transparent member 1C is improved when viewed from the observer on the second surface B side, and the scene is visually recognized. Excellent in properties. Moreover, it is excellent in the visibility of the image | video by the image light projected from the projector 200 (illustration omitted) of the 1st surface A side seeing from the observer of the 1st surface A side.

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

As a function of the member serving as the light attenuating layer, a half mirror may be used as the light attenuating layer as long as it has a function of reducing the transmittance.
The reflectivity of the half mirror may be 5% or more, preferably 10% or more, and may be 25% or more depending on the case.
By arranging the half mirror between the video display unit and the projector, it is possible to project on both sides in addition to the above-described effects. Moreover, since it can be provided with a function as a magic mirror by disposing it in a portion that is not between the image display unit and the projector, it is also possible to make it difficult for the observer to recognize the backward image omission. Become.
As an aspect of the light attenuation layer in the reflective image display transparent member of the present invention, as described above, the second transparent substrate 20 in FIGS. 1 and 3, the first transparent substrate 10A in FIG. 4, and FIG. Examples of the transparent transparent film shown in FIG. 7, transparent substrates and transparent films exemplified in the first transparent substrate 10A and the second transparent substrate 20 shown in FIG. 8, and a half mirror.

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

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

In the reflective image display transparent member of the present invention, the uneven structure on the surface of the first transparent layer may be a regular uneven structure (such as a microlens array). However, for the following reasons, the uneven structure on the surface of the first transparent layer is preferably an irregular uneven structure.
When a reflective film is formed on the surface of a regular concavo-convex structure (such as a microlens array), color unevenness occurs in the scene seen from the image display transparent member as viewed from the observer side due to light diffraction, Visibility is impaired because the edge portion of the scene seen from the viewer side beyond the video display transparent member looks like a rainbow color. On the other hand, when a reflective film is formed on the surface of an irregular concavo-convex structure, light diffraction and spectroscopy hardly occur, and these problems hardly occur. Therefore, the phenomenon that the color changes depending on the viewing direction and location of the image display transparent member and the direction of incident light is suppressed, and the spectroscopic view of the scene seen beyond the image display transparent member is suppressed. As a result, it is possible to provide a property as a transparent screen that is excellent in visibility of a scene seen beyond the image display transparent member and does not disturb the line of sight.

In addition, other examples of the uneven structure with a reflective film, after embedding the unevenness, a half mirror laminated with a scattering material; a reflection, deflection and diffusion by a volume hologram; a kinoform hologram, Others that are deflected, reflected, or diffused by the surface of the uneven surface and the structure on which the reflective film is formed; those that use cholesteric liquid crystals and polymer cholesteric liquid crystals (cholesteric liquid crystals that are aligned and formed on the surface of the uneven structure, polymers The surface of the cholesteric liquid crystal is roughened by etching, etc., the liquid crystal layer of the cholesteric liquid crystal is formed on a horizontal and vertical alignment base material, and the surface of the cholesteric liquid crystal is added with a surfactant. In addition, the surface of the coated surface is vertically distributed, or the orientation of the coated surface is reduced).
Further, even if there is no reflective film, if the first transparent substrate 10 can sufficiently reflect and scatter light only with the concavo-convex structure, it is not always necessary to provide the reflective film.

<Transparent video display transparent member>
The second aspect of the image display transparent member of the present invention has a first surface and a second surface opposite to the first surface, and gives a scene on the first surface side to an observer on the second surface side. The second surface side observer transmits the second surface side view so as to be visible to the first surface side observer, and the image light projected from the first surface side. A video display transparent member that is visibly displayed as video, wherein the video display transparent member has a light attenuation layer that attenuates part of the light transmitted through the video display transparent member. It is a member.

FIG. 10 is a layer configuration diagram showing an example of a transmissive image display transparent member of the present invention. Hereinafter, the same components as those of the video display transparent member 1 of FIG.
In the video display transparent member 5, the video display unit 40 is disposed between the first transparent base material 10 and the second transparent base material 20, and a light attenuation component is blended in the second transparent base material 20. The light attenuating layer attenuates part of the light that is colored and transmitted through the image display transparent member 1.
The first transparent base material 10 and the video display unit 40 are bonded by the adhesive layer 12, and the second transparent base material 20 and the video display unit 40 are bonded by the adhesive layer 22.
In the image display transparent member 5, the second transparent base material 20 is a light attenuation layer, so that when the observer Y sees the scene on the other side of the image display transparent member 5, the visibility of the scene is improved. It will be excellent.

(Video display section)
The video display unit 40 includes: a first transparent film 41; a transparent layer 42 provided on the surface of the first transparent film 41; and an inside of the transparent layer 42 arranged in parallel with each other at a predetermined interval. A light scattering sheet having a plurality of light scattering portions 43 extending in the plane direction and having a right triangle in a cross section perpendicular to the longitudinal direction; and a second transparent film 45 provided on the surface of the transparent layer 42. . Hereinafter, a structure in which a plurality of light scattering portions 43 extending in a one-dimensional direction in a stripe shape is sometimes 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 a transparent resin film or a thin glass film. The material of each transparent film may be the same or different.
What is necessary is just to use the thing similar to the transparent film of the video display part 30 mentioned above as a transparent film.

(Transparent layer)
The transparent layer 42 is preferably a transparent resin layer.
As the transparent resin constituting the transparent resin layer, the same transparent resin as that constituting the transparent resin layer of the video display unit 30 described above may be used.

The thickness of the transparent layer 42 is preferably 10 to 200 μm. When the thickness of the transparent layer 42 is 10 μm or more, the interval 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 a light attenuating material as necessary.

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

As the light scattering material, fine particles of 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), etc. Fine particles of a low refractive index material such as porous silica (refractive index: 1.3 or lower), hollow silica (refractive index: 1.3 or lower), etc .; a resin material having a low refractive index with low compatibility with the transparent resin; crystal And a resin material having a thickness of 1 μm or less.

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

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

The distance between the light scattering portions 43 (the distance between the centers of the adjacent light scattering portions 43) is preferably 10 to 250 μm, and more preferably 10 to 100 μm. If the interval between the light scattering portions 43 is 10 μm or more, the light scattering portions 43 are easily formed. If the space | interval of the light-scattering part 43 is 250 micrometers or less, the light-scattering part 43 will be hard to visually recognize.

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

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

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

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

Light (ultraviolet rays or the like) 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 protrusions of the mold 62 formed on the surface. After that, the mold 62 is peeled as shown in FIG.

As shown in FIG. 11C, a paste containing a photocurable resin, a light scattering material, and, if necessary, a light attenuating material is supplied to the surface of the transparent layer lower layer 42a, and the excess is scraped off with a doctor blade. Thus, the paste 48 is embedded in the groove 44 of the transparent layer lower layer 42a. The light scattering part 43 is formed by irradiating light (ultraviolet light or the like) and curing the paste 48.

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

Examples of the mold 62 include a resin film having a plurality of convex portions formed on the surface, a metal plate, and the like.
Examples of the photocurable resin coating method include a die coating method, a blade coating method, a gravure coating method, a spin coating method, an ink jet method, and a spray coating method.

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

The forward haze of the image display transparent member 5 is preferably 4% or more, more preferably 5% or more, and still more preferably 8% or more, from the viewpoint of securing screen gain and viewing angle.
The forward haze of the image display transparent member 5 is preferably 40% or less, more preferably 30% or less, and more preferably 20% or less, from the viewpoint of visibility of a scene seen from the viewer side. Is more preferable.

The difference between the refractive index of the transparent layer 42 and the refractive index of the light scattering portion 43 in the image display transparent member 5 is preferably 0.01 or less, more preferably 0.005 or less, and further preferably 0.001 or less. 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 plurality of scenes appearing on the other side of the image display transparent member 5 when viewed from the observer side are seen. The transparent layer 42 and the light scattering portion 43 preferably have the same refractive index from the viewpoint of suppressing rainbow unevenness and spectroscopic spectacles.

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

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

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

The projector 200 may be anything that can project the image light L onto the image display transparent member 5. Examples of the projector 200 include a known projector.

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

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

(Mechanism of action)
In the transmissive video display transparent member 5 described above, and the video display system and video display method using the same, for example, the video display transparent member 5 is used as a window so that the second surface B is outdoor. In this case, the second transparent substrate in which a part of the scattered light, which is scattered by the light scattering portion 43 from the scene (indoor) entering the image display transparent member 5 from the first surface A side, is a light attenuation layer. It is absorbed by the material 20 and decreases. As a result, when the viewer Y views the scene on the other side of the image display transparent member 5, the resolution of light transmitted from the other side of the image display transparent member 5 is improved. Therefore, the visibility of the scene is excellent. Further, the sunlight L1 incident on the image display transparent member 5 from the second surface B side is scattered by the light scattering portion 43, and a part of the reflected scattered light is the second transparent base material 20 which is a light attenuation layer. It is absorbed by and decreases. As a result, when the observer on the A side of the first surface views the scene (outdoor) beyond the image display transparent member 5, the contrast of light transmitted from the other side of the image display transparent member 5 is improved. Therefore, the contrast of the scene beyond the image display transparent member 5 as viewed from the observer Y is improved, and the visibility of the scene during the daytime is excellent.
Further, in this example, a part of the transmitted scattered light, which is the image light projected from the projector 200 and scattered by the light scattering portion 43, is attenuated by the second transparent base material 20 that is a light attenuation layer, thereby light attenuation. The image gain is lower than when there is no layer, but this can be dealt with by increasing the amount of image light from the projector 200.
When using a polarization-dependent material for the second transparent substrate 20, aligning the direction of high transmittance of the polarization-dependent material in the same direction as the main polarization direction of the projection light L, the image light The visibility of the viewer Y can be improved by increasing the transmittance of the scene on the other side while suppressing the decrease in gain.

(Other embodiments)
The transmissive image display transparent member of the present invention has a first surface and a second surface opposite to the first surface, and gives a scene on the first surface side to an observer on the second surface side. The second surface side observer transmits the second surface side view so as to be visible to the first surface side observer, and the image light projected from the first surface side. A video display transparent member that is visibly displayed as an image, as long as the video display transparent member has a light attenuation layer that attenuates part of the light transmitted through the video display transparent member. The number 10 of the image display transparent members 5 is not limited. Hereinafter, the same components as those of the video display transparent member 5 in FIG.

As shown in FIG. 12, the transmissive image display transparent member of the present invention may be a video display transparent member 6 in which the first transparent substrate 10 is omitted. Specific examples of the video display transparent member 6 include an example in which the second transparent substrate 20 is an existing window glass or the like, that is, an example in which the video display unit 40 is pasted on an existing window glass or the like. .
In addition, in a multi-layer glass having two glass plates and a frame-shaped spacer disposed so as to form a gap between the glass plates, one glass plate is a colored glass plate Further, the image display unit 40 may be attached to the inner surface of one of the glass plates.

As shown in FIG. 13, the transmissive image display transparent member of the present invention is colored with a light-attenuating component blended in place of the first transparent base material 10, and transmits a part of the light transmitted through the transparent member. An image having a first transparent base material 10A that serves as a light attenuation layer to be attenuated, and having a second transparent base material 20A that is not colored and does not contain a light attenuation component, instead of the second transparent base material 20. The display transparent member 5A may be used.
In the video display transparent member 5A, for example, when the video display transparent member 5A is used as a window so that the second surface B is outdoor, it is from a scene (outdoor) incident on the video display transparent member 5A from the second surface B side. A part of the scattered light scattered by the light scattering portion 43 is absorbed by the second transparent substrate 20 that is the light attenuation layer and decreases. As a result, when the observer Y views the scene beyond the image display transparent member 5A, the resolution of light transmitted from the other side of the image display transparent member 5 is improved. Therefore, the visibility of the scene is excellent. Further, a part of the reflected scattered light, which is scattered by the light scattering portion 43 of the illumination light L2 incident on the image display transparent member 5A from the first surface A side, is the first transparent base material 10A which is a light attenuation layer. Decreases after being attenuated. As a result, when the observer on the first surface A side views the scene (outside the room) beyond the image display transparent member 5A, the contrast of light transmitted from the other side of the image display transparent member 5A is improved. Therefore, the contrast of the scene on the other side of the image display transparent member 5A as viewed from the observer on the first surface A side is improved, and the visibility of the scene at night is excellent.
When using a polarization-dependent material for the first transparent substrate 10A, aligning the direction of high transmittance of the polarization-dependent material in the same direction as the main polarization direction of the projection light L, the image light The visibility of the viewer X can be increased by increasing the transmittance of the scene on the other side while suppressing the decrease in gain.

As shown in FIG. 14, the transmissive image display transparent member of the present invention has a first transparent base material 10 and a second transparent base material 20A, both of which are not blended with light attenuation components and are not colored. A light attenuating layer 50 is disposed on the surface of the second transparent base material 20A opposite to the image display unit 40 so that a light attenuating component is blended and colored and a part of the light transmitted through the transparent member is attenuated. The image display transparent member 7 may be used. The second transparent base material 20 A and the light attenuation layer 50 are bonded by an adhesive layer 52.
The light attenuation layer 50 and the adhesive layer 52 of the video display transparent member 7 are the same as the light attenuation layer 50 and the adhesive layer 52 of the video display transparent member 3.
In the video display transparent member 7, as in the video display transparent member 5, the contrast of the scene on the other side of the video display transparent member 7 is improved when viewed from the observer on the second surface B side, and the visibility of the scene is improved. Excellent.

As shown in FIG. 15, the transmissive image display transparent member of the present invention omits the first transparent base material 10 and the second transparent base material 20, and eliminates the second transparent film 45 of the video display unit 40. The image display transparent member 8A having the light attenuation layer 50 disposed on the surface may be used. In the video display transparent member 8A, as in the video display transparent member 5, the contrast of the scene on the other side of the video display transparent member 8A is improved when viewed from the observer on the second surface B side, and the visibility of the scene is improved. Excellent.
Further, as shown in FIG. 16, an image in which the first transparent base material 10 and the second transparent base material 20 are omitted and the light attenuation layer 50 is disposed on the surface of the first transparent film 41 of the image display unit 40. The display transparent member 8B may be used. In the video display transparent member 8B, as in the video display transparent member 5A, the contrast of the scene on the other side of the video display transparent member 8B is improved when viewed from the observer on the first surface A side, and the visibility of the scene is improved. Excellent.

The video display

transparent members

8A and 8B can be attached to an existing window glass or the like using an adhesive layer. The video display

transparent members

8A and 8B can be deformed and are suitable for forming a video display transparent member having a curved surface.
Further, the video display

transparent members

8A and 8B in FIGS. 15 and 16 may have video display units in which the first transparent film 41 and the second transparent film 45 are replaced with transparent base materials, respectively.

As shown in FIG. 17, the transmissive image display transparent member of the present invention has a first transparent base material 10A and a second transparent base material 20 that are colored by mixing light attenuation components. The transparent member 5B may be used.
In the image display transparent member 5B, for the same reason as the image display transparent member 5, the contrast of the scene on the other side of the image display transparent member 5B is improved when viewed from the observer on the second surface B side, and the scene is visually recognized. Excellent in properties.

As shown in FIG. 18, the reflection type image display transparent member of the present invention has the first transparent base material 10 and the second transparent base material 20A which are not blended with any light attenuation component and are not colored. A video display transparent member 5C having a video display portion 40A which is a light attenuation layer which is colored by mixing a light attenuation component with the second transparent film 45A and attenuates part of the light transmitted through the transparent member. May be.
In the video display transparent member 5C, for the same reason as the video display transparent member 5, the contrast of the scene on the other side of the video display transparent member 5C is improved when viewed from the observer on the second surface B side, and the scene is visually recognized. Excellent in properties.

Further, in the video display transparent member 5C, instead of the second transparent film 45A, the first transparent film 41 is colored by mixing a light attenuation component and attenuates part of the light transmitted through the transparent member. It may be a layered video display transparent member. In addition, the first transparent film 41 and the second transparent film 45 are both colored and mixed with a light attenuation component, and the image display transparency is a light attenuation layer that attenuates part of the light transmitted through the transparent member. It may be a member.
In addition, the transmission-type image display transparent member of the present invention has a second transparent substrate 20A in which no light attenuation component is blended in the image display transparent member 5 instead of the second transparent substrate 20. The image display transparent member is a light attenuating layer in which one or both of the adhesive layer 12 and the adhesive layer 22 are mixed with a light attenuating component and colored to attenuate part of the light transmitted through the transparent member. May be.
Examples of the light attenuating component blended in the transparent film or the adhesive layer of the video display unit include the same as those mentioned in the light attenuating layer 50.

As a function of the member serving as the light attenuating layer, a half mirror may be used as the light attenuating layer as long as it has a function of reducing the transmittance.
The reflectivity of the half mirror may be 5% or more, preferably 10% or more, and may be 25% or more depending on the case.
By arranging the half mirror between the light scattering portion 43 and the projector, in addition to the above effect, a function as a magic mirror can be added, so that it is difficult for the observer to recognize the forward video omission. Will be able to. In addition, by disposing the light scattering unit 43 in a portion that is not between the light scattering unit 43 and the projector, projection onto both surfaces is possible.
As described above, the mode of the light attenuation layer in the transmissive image display transparent member of the present invention is the second transparent substrate 20 in FIGS. 10 and 12, the first transparent substrate 10A in FIG. Examples of the transparent transparent film shown in FIG. 16, transparent substrates and transparent films exemplified in the first transparent substrate 10 A and the second transparent substrate 20 in FIG. 17, and a half mirror are given.

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

Further, as the light scattering sheet of the image display unit, without providing a plurality of light scattering units as shown in the illustrated example in the transparent layer, the light scattering fine particles are dispersed throughout the transparent layer so that the transparent layer itself is used as the light scattering layer. It may be what you did.
Examples of the light scattering fine particles include fine particles of a high refractive index material such as titanium oxide, zirconium oxide, and aluminum oxide described above; fine particles of a low refractive index material such as porous silica and hollow silica. The concentration of the light scattering fine particles is preferably from 0.01 to 5% by volume, more preferably from 0.05 to 1% by volume. The average particle diameter of the light scattering fine particles is preferably 50 to 1000 nm, more preferably 100 to 800 nm, for the reasons described above.
The light scattering layer may include a light attenuating material for the reasons described above. The concentration of the light attenuating material is preferably 0.01 to 5% by volume, more preferably 0.1 to 3% by volume.

EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited by the following description.
Examples 2 and 4 are examples, and examples 1 and 3 are comparative examples.

(Example 1)
On the surface of a transparent polyethylene terephthalate (hereinafter referred to as PET) film (Toyobo Co., Ltd., Cosmo Shine (registered trademark) A4300, thickness: 0.1 mm), an ultraviolet curable resin (Osaka Gas Chemical Co., Ltd. A solution prepared by mixing 3 parts by mass of a photoinitiator (manufactured by BASF, Irgacure (registered trademark) 907) with 100 parts by mass of (registered trademark) EA-F5003) was applied to a thickness of 10 μm by a die coating method.
A white PET film (E20 manufactured by Toray Industries Co., Ltd., arithmetic average roughness Ra: 0.23 μm) with an irregular concavo-convex structure formed on the surface is placed on the UV curable resin so that the concavo-convex structure is in contact with the UV curable resin. Overlaid on.

After irradiating 1000 mJ ultraviolet rays from the transparent PET film side to cure the ultraviolet curable resin to form the first transparent layer having the irregular uneven structure of the white PET film transferred to the surface, the white PET film Was peeled off.
Aluminum was physically vapor-deposited on the surface of the first transparent layer by a vacuum vapor deposition method to form a reflective film made of an aluminum thin film (thickness: 8 nm).

On the surface of the reflective film, 3 parts of photoinitiator (BASF, Irgacure (registered trademark) 907) is added to 100 parts by weight of UV curable resin (Ossol (registered trademark) EA-F5003, manufactured by Osaka Gas Chemical Company). The partially mixed solution was applied to a thickness of 10 μm by a die coating method, and a transparent PET film (thickness: 0.1 mm) was overlaid on the ultraviolet curable resin.
The image display part of Example 1 which consists of a light-scattering sheet was obtained by irradiating a 1000 mJ ultraviolet-ray, hardening an ultraviolet curable resin, and forming a 2nd transparent layer.

Soda lime glass plate (Matsunami Glass Co., Ltd., thickness: 3 mm), polyvinyl butyral (hereinafter referred to as PVB) film (Solutia, Saflex RK11l, thickness: 375 μm), image display section of Example 1, PVB film ( Thickness: 375 μm) and soda lime glass plate (thickness: 3 mm) were laminated in this order, and vacuum thermocompression bonding was performed to obtain a reflective video display transparent member of Example 1. The evaluation results of the image display transparent member of Example 1 are shown in Table 1.

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

(Example 3)
On the surface of a transparent PET film (Cosmo Shine (registered trademark) A4300 manufactured by Toyobo Co., Ltd., thickness: 50 μm), an ultraviolet curable resin (Hitaroid (registered trademark) 7981, specific gravity 1.1 manufactured by Hitachi Chemical Co., Ltd.) is applied by blade coating. A thickness of 80 μm was applied.
A mold having a plurality of ridges with a right-angled triangle cross section corresponding to the light scattering portion formed on the surface is exposed to ultraviolet rays at a temperature of 25 ° C. and a gauge pressure of 0.5 MPa so that the ridges are in contact with the ultraviolet curable resin. Pressed onto the curable resin.

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

Ultraviolet curable resin (Hitaloid (registered trademark) 7981, manufactured by Hitachi Chemical Co., Ltd., specific gravity 1.1) and titanium oxide fine particles (average particle size: 0.2 μm, specific gravity 4.2) are 0.1% by volume. A paste mixed with was prepared.
The paste was embedded in the groove of the lower layer of the transparent layer by supplying the paste to the surface of the lower layer of the transparent layer and scraping off the excess with a doctor blade. The light scattering portion was formed by irradiating ultraviolet rays and curing the paste.

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

Soda-lime glass plate (manufactured by Matsunami Glass Co., Ltd., thickness: 3 mm), PVB film (manufactured by Solutia, Saflex (registered trademark) RK11l, thickness: 375 μm), video display section of Example 3, PVB film (thickness: 375 μm) The soda-lime glass plates (thickness: 3 mm) were laminated in this order, and vacuum thermocompression bonding was performed to obtain a transmission type image display transparent member of Example 3. Table 1 shows the evaluation results of the image display transparent member of Example 3.

(Example 4)
In the image display transparent member of Example 3, the transmissive type image display transparency of Example 4 is used by using colored glass (made by Asahi Glass Co., Ltd., <Product Name> Myvale, the same as Example 2) as the second transparent substrate. A member was obtained. The evaluation results of the image display transparent member of Example 4 are shown in Table 1.

The evaluation criteria in the table are as follows.
(Scene visibility)
The image display transparent member is installed outdoors during the day so that the second surface faces the sun, and the visibility of the sight seen beyond the image display transparent member when viewed from the observer on the second surface side is Evaluation was made according to the following criteria.
0: Good.
1: Good when the near side is dark or the outside light is small.
2: At a level where rough recognition is possible.
3: The scene cannot be visually recognized.

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

Example 2 and Example 4, which are examples of the present application, were excellent in visibility of the scene because the scattered light was controlled and the resolution was improved.

The image display transparent member of the present invention can be used in products such as showcases for goods, exhibition cases for works of art, animals, etc .; windows for buildings, showrooms, vehicles, etc .; glass doors; indoor transparent partitions; It is useful as a transparent member to be used. Specifically, it is possible to visually recognize the scene seen from the side of the transparent member when viewed from the observer side, and to transmit information such as explanation of products, state of various devices, destination guidance, transmission items, etc. to the observer. When displaying the operation screens of various devices to the viewer, or when making the view beyond the transparent member invisible to the viewer for privacy protection, security, etc. It is useful as a so-called transparent screen that displays the image light projected from the viewer in an observable manner as an image to the observer.
Moreover, it is useful when used for a window glass for a moving means such as a vehicle or an aircraft because it can be used as a transparent screen or a head-up display.
In addition, the entire content of the specification, claims, drawings and abstract of Japanese Patent Application No. 2014-128552 filed on June 23, 2014 is cited here as the disclosure of the specification of the present invention. Incorporated.

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

Claims

It has a first surface and a second surface opposite to the first surface, and transmits the scene on the first surface side so as to be visible to the observer on the second surface side, and displays the scene on the second surface side. The image light that is visibly transmitted to the observer on the first surface side and is projected from the projector installed on the first surface side is transmitted to the observer on the first surface side and the second surface side. An image display transparent member that is visibly displayed as an image on one of the observers,
The video display transparent member has a light attenuating layer that attenuates part of light transmitted through the video display transparent member.
The image display transparent member according to claim 1, wherein the light attenuation layer has polarization dependency.
The image display transparent member according to claim 1 or 2, wherein the transmittance of the light attenuation layer is 70% or less.
The light-attenuating layer is gray (uniform throughout the visible light (0.25 to x to 0.4, 0.25 to y to 0.4 in the xyY color system)). The video display transparent member according to any one of the above.
The image display transparent member according to any one of claims 1 to 3, wherein the light attenuation layer has a bluish color (x to 0.33, y to 0.5 in the xyY color system).
The image display transparent member according to any one of claims 1 to 3, wherein the light attenuating layer is tinged with green (y> x, 0.33 to y in the xyY color system).
The image display transparent member according to any one of claims 1 to 3, wherein the light attenuation layer is a half mirror.
The image display transparent member according to any one of claims 1 to 7, wherein the forward haze is 50% or less.
It is a reflective type that displays the image light projected from the first surface side as an image to the viewer on the first surface side so as to be visible.
The forward haze is 20% or less,
Back haze is 5% or more,
The video display transparent member according to any one of claims 1 to 8, wherein a ratio of rear haze to front haze (rear haze / front haze) is 1 or more.
It is a reflective type that displays the image light projected from the first surface side as an image to the viewer on the first surface side so as to be visible.
Between the first surface and the second surface,
A first transparent layer having an uneven structure on the surface;
A reflective film that is formed along the surface of the first transparent layer on the concave-convex structure side and transmits a part of incident light;
A second transparent layer provided to cover the surface of the reflective film;
The video display transparent member according to any one of Claims 1 to 9, further comprising a video display unit having:
The image display transparent member according to claim 10, wherein the uneven structure on the surface of the first transparent layer is an irregular uneven structure.
The image display transparent member according to claim 10 or 11, wherein the area of the light attenuation layer is the same as the area of the image display unit or larger than the area of the image display unit.
The video display transparent member is a transmissive type that displays video light projected from the first surface side so as to be visible as an image to an observer on the second surface side,
The video display transparent member according to any one of claims 1 to 8, wherein the forward haze is 4 to 40%.
The video display transparent member is a transmissive type that displays video light projected from the first surface side so as to be visible as an image to an observer on the second surface side,
Between the first surface and the second surface,
A transparent layer,
A plurality of light scattering portions extending in the plane direction, arranged in parallel to each other at a predetermined interval inside the transparent layer;
The video display transparent member according to any one of claims 1 to 8, or 13, comprising:
The video display transparent member according to any one of claims 1 to 14,
A projector installed on the first surface side of the image display transparent member;
A video display system with
The video display transparent member according to any one of claims 1 to 14,
A video display method for displaying video by projecting video light from a projector installed on the first surface side of the video display transparent member.