JP2017076078A - Transparent screen including image display transparent member, and image display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image display transparent member that suppresses display of an image on a side opposite to a surface for displaying the image and prevents the projected image and information from being observed from the side opposite to the surface for displaying the image when using the image display transparent member for reflecting and displaying an image projected by a projector, and to provide an image display system and an image display method using the image display transparent member.SOLUTION: Provided is a transparent screen 1 comprising a pair of transparent members that oppose via a hollow layer 2 and are separated by a spacer 5, where one of the pair of transparent members is a transparent plate 4 having a low-reflection film on one surface and the other includes a reflection-type image display transparent member 3, and the reflection-type image display transparent member 3 comprises an irregular surface reflection film and two transparent layers 10 and 20 adhesively provided while sandwiching the reflection film.SELECTED DRAWING: Figure 1

Description

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

There is known an image display transparent member that can display a projected image by reflected light, and can visually recognize a sight on this side when the image is not projected and a sight on the other side on this side.
For example, a first transparent layer in which a regular uneven structure (microlens array) is formed on the surface between a first transparent substrate and a second transparent substrate, and An image display transparent member having a reflective film that transmits a part of incident light, and a second transparent layer that is provided so as to cover the surface of the reflective film, that is formed along the surface on the concave-convex structure side Has been proposed (see Patent Document 1).
Further, as a head-up display for an automobile capable of projecting an image from a projector, a layered member composed of two outer layers and a central layer with unevenness inserted between them has been proposed (see Patent Document 2). .

In the reflective image display transparent member, the image light projected from the projector and incident from the surface of the second transparent substrate (or the first transparent substrate) is imaged, scattered and projected on the reflective film. It is displayed so as to be visible as an image to an observer on the same side as the machine. This video display transparent member has high transparency (low haze), high visibility of the scene, and high video screen gain.
In addition, a scene on the other side of the image display transparent member can be visually recognized from an observer on the same side as the projector and from an observer on the opposite side to the projector.

  However, in the reflective image display transparent member, the projected image may be visible even from the observer on the opposite side of the projector, and the observation on which the image is projected on the same side as the projector There was a possibility that the privacy of the person in charge was impaired.

Special table 2010-539525 gazette Special table 2014-509962 gazette

  The present invention suppresses the display of an image on the side opposite to the surface on which the image is to be displayed as described above, and the projected image or information is not observed from the side opposite to the surface on which the image is to be displayed. Provided are a display transparent member, and an image display system and an image display method using the same.

The present invention is a transparent screen comprising a pair of transparent members facing each other through a hollow layer and separated by a spacer, wherein one of the pair of transparent members has a low radiation film on one side. The other is made of the following reflective video display transparent member, and one of the following first surface and second surface is a transparent screen facing the hollow layer. Further, the reflective image display transparent member is a transparent member having a first surface and a second surface opposite to the first surface, and the scene on the first surface side is given to the 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. This is a video display transparent member that is displayed as a video in a visible manner.
Moreover, this invention is an image | video display system provided with the said transparent screen and the projector installed in the position which can project image light on the said transparent screen.

  According to the transparent screen, the image display transparent member, and the image display system using the same according to the present invention, it is difficult to observe the image from the observer on the opposite side of the surface on which the image is to be displayed.

It is a schematic block diagram which shows an example of the transparent screen which consists of a transparent image display transparent member and transparent member which has a low radiation film of this invention. It is a schematic block diagram which shows an example of the reflection type image display transparent member of this invention. It is the schematic which shows an example of the manufacturing method of the reflection type image display transparent member of this invention. It is a schematic block diagram which shows another example of the reflection type image display transparent member of this invention.

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 diffuse reflectance is an incident angle of 0 from the first surface side (or the second surface side) of the image display transparent member? The ratio (percentage) of the reflected light that deviates 0.044 rad (2.5 °) or more from the specularly reflected light reflected on the first surface side (or the second surface side) with respect to the incident light incident on. When measuring the diffuse reflectance, the image display transparent member is applied from the second surface side (or the first surface side) opposite to the first surface side (or the second surface side) to be measured. Cover the opposite surface with a black curtain so that light does not enter. In addition, an aperture having the same diameter as the incident light is set in close contact with the object to be measured.
The transmittance, reflectance, and haze are measured using a D65 light source defined in JIS Z8720 (2012) “Standard Illuminant for Colorimetry (Standard Light) and Standard Light Source”.

(Mode of the present invention)
The form of the transparent screen of the present invention is a transparent screen comprising a transparent plate having a low radiation film on one side facing each other through a hollow layer and separated by a spacer, and a reflective video display transparent member.
The reflective image display transparent member is a transparent member having a first surface and a second surface opposite to the first surface, and a scene on the first surface side is visually recognized by an observer on the second surface side. The second surface side view is transmitted to the first surface side viewer so that the viewer can see the image light, and the image light projected from the first surface side is transmitted to the first surface side observer. It is a reflective video display transparent member that is displayed so as to be visible as a video. Either one of the first surface and the second surface faces the hollow layer, and the effect does not change regardless of which one faces.
FIG. 1 is a schematic configuration diagram showing an example of a transparent screen according to the present invention and an example of a display system.
An embodiment of the present invention will be described with reference to FIG. 1, but the present invention is not limited to this.

In the transparent screen 1 of the present invention, a transparent plate 4 having a low radiation film on one side is disposed via a video display transparent member 3 and a hollow layer 2. The projection light L projected from the projector 200 forms an image on the image display transparent member 3, and is displayed as reflected light L1 so as to be visible to the observer X. On the other hand, part of the projection light L passes through the image display transparent member 3 through the image display transparent member 3 as transmitted light L2. Since the transparent plate 4 has a low radiation film, it easily reflects light on the surface, and the transmitted light L2 incident on the transparent plate 4 is reflected on the transparent plate 4 and transmitted to the viewer Y who does not want to show an image. Light L2 is difficult to transmit.
Further, since the scene on the viewer Y side is reflected on the transparent plate 4 to form a virtual image, the viewer Y is less likely to visually recognize the transmitted light L2. For the observer X, since the transparent screen 1 has the hollow layer 2, even if the image projected from the projector 200 is reflected on the transparent plate 4, it is difficult to form a double image. As a result, it becomes easy to protect the privacy of the observer X without degrading the visibility of the image projected from the projector 200.

In the transparent screen 1 according to the embodiment of the present invention, the image display transparent member 3 and the transparent plate 4 are separated by a spacer 5. The spacer 5 may be disposed on the entire periphery or a part of the periphery of the transparent plate 4 and the image display transparent member 3. Alternatively, the outer peripheral portion of the spacer 5 may be sealed with a sealing agent, and so-called multilayer glass in which the hollow layer 2 is sealed may be used.
In the transparent screen 1 according to the embodiment of the present invention, the spacer 5 may be one that is normally used for double windows or double glazing. When sealing the hollow layer 2, it is preferable that the spacer 5 contains a desiccant.
As the sealant, those usually used for double-layer glass can be used, and silicone sealants, butadiene sealants and the like are used.
It is preferable that the hollow layer of the transparent screen 1 of the present invention is sealed with a sealing agent because heat insulation and sound insulation can be further obtained.

(Hollow layer)
In the embodiment of the present invention, the thickness of the hollow layer 2, that is, the distance between the transparent plate 4 and the image display transparent member 3 is preferably 4 mm to 20 mm. When it is at least the lower limit, heat insulation and soundproofing performance are improved, and when it is not more than the upper limit, it can be disposed in a space-saving manner.
When the hollow layer 2 is sealed with a sealing material, the gas sealed in the hollow layer 2 can be a known gas used for double-glazed glass; air, helium, argon, etc., but air is preferred.

(Transparent plate)
The transparent plate 4 in the embodiment of the present invention has a radiation film on one side.
Examples of the material of the transparent plate 4 in the embodiment of the present invention include glass and transparent resin. The transparent plate 4 is preferably made of the same material as the transparent base material used in the image display transparent member 3. The material of the transparent plate 4 is preferably glass among the above materials because the visibility of the virtual image is improved from the viewpoint of durability and ease of ensuring flatness.

  Examples of the glass used for the transparent plate 4 include soda lime glass, alkali-free glass, borosilicate glass, and aluminosilicate glass.

  Examples of the transparent resin used for the transparent plate 4 include polycarbonate, polyester (polyethylene terephthalate, polyethylene naphthalate, etc.), triacetyl cellulose, cycloolefin polymer, polymethyl methacrylate, etc. From the viewpoint of weather resistance and transparency, polycarbonate Polyesters and cycloolefin polymers are preferred.

The transparent plate 4 preferably has no birefringence.
The thickness of the transparent plate 4 should just be the thickness by which durability as a base material is maintained. The thickness of the transparent plate 4 may be, for example, 0.01 mm or more, 0.05 mm or more, and 0.1 mm or more. The thickness of the transparent plate 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. Good.

(Low emission film)
The low radiation film is formed on the interface between one surface of the transparent plate 4 and air.
The low radiation film may be any light that transmits at least part of visible light and reflects at least part of infrared light among the light incident on the low radiation film.
Examples of the low emission film include a metal film, a semiconductor film, a dielectric single layer film, a dielectric multilayer film, and a multilayer film obtained by combining these.

Examples of the metal constituting the metal film and the semiconductor film include aluminum, silver, nickel, chromium, tungsten, silicon, and the like. Aluminum, silver, or an alloy containing them as a main component is preferable. In particular, it is preferable that the material is silver because the discoloration of the projected image hardly occurs due to absorption.
Examples of the dielectric constituting the dielectric film include metal oxides and metal nitrides.
The low emission film is preferably a metal thin film or a film structure in which an oxide film, a metal thin film, and an oxide film are laminated in this order.

When the low radiation film is a metal film, the thickness of the metal film is preferably 1 to 100 nm, more preferably 4 to 60 nm, from the viewpoint of ensuring visible light transmittance and efficiently reflecting infrared rays. preferable. In addition, the thickness of the metal film is preferably 40 to 100 nm from the viewpoint of protecting the privacy of an observer projecting an image.
The thickness of the low emission film is preferably about 1 to 5000 nm and more preferably about 10 to 3000 nm in order to achieve both infrared reflectance and visible light transmittance.
The visible light reflectance of the low radiation film is that the visibility of the background is not impaired, the visible light reflectance on the surface of the first transparent substrate 10 and the visible light reflectance on the surface of the second transparent substrate 20. It is preferably lower than the total of these, specifically 20% or less, particularly 10% or less.
As the transparent plate 4 having such a low radiation film, Low-E glass is preferable. The low radiation film of the transparent plate 4 is preferably arranged on the hollow layer side.

(Reflective video display transparent member)

FIG. 2 is an enlarged view of the image display transparent member 3 in FIG.
The image display transparent member 3 has a first surface A and a second surface B, in which an image display unit 30 is disposed between the first transparent substrate 10 and the second transparent substrate 20. It is.
The video display unit 30 can be used so that the scene on the side of the first surface or the second surface is visibly transmitted to the opposite side, and the image from the video projector can be displayed so as to be visible.
The video display unit 30 includes a reflective film 33 having an irregular concavo-convex structure between the transparent layer 32 and the transparent layer 34, and the surfaces of the transparent layer 32 and the transparent layer 34 (hereinafter also collectively referred to as a transparent layer). The transparent film 31 and the transparent film 35 are each composed of a light scattering sheet provided so as to cover the surface of the transparent layer. The reflective film 33 is in close contact with the transparent layer 32 and the transparent layer 34. Therefore, the surface where the transparent layer 32 and the reflective film 33 are in contact with the surface where the reflective film 33 is in contact with the transparent layer 34 has substantially the same structure.
As the material of the transparent substrate, the same material as that of the transparent plate can be used.
The video display unit will be described below.

(Reflective film)
The reflective film 33 is disposed between the transparent layer 32 and the transparent layer 34.
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, Cu, Ti, Zr, 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 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. 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, it is more preferable that the concave-convex structure does not get in the way when viewing the scene on the other side of the image display transparent member 3.

The thickness of the reflective film 33 is preferably 1 to 100 nm, and more preferably 4 to 25 nm.
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.
The reflective film 33 has an irregular concavo-convex structure by uniformly molding the film material on the surface of the irregular concavo-convex structure formed in the first transparent layer 32 or the second transparent layer 34. be able to.

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

  The transparent resin constituting the transparent resin layer is preferably 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. 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 concavo-convex structure) 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 thickness means the thickness excluding the concavo-convex structure when the concavo-convex structure is formed in the transparent layer.
The transmittance of the transparent layer is preferably 50 to 100%, more preferably 75 to 100%, and still more preferably 90 to 100%.

It is preferable that one side of the transparent layer has an irregular uneven structure corresponding to the reflective film 33.
The arithmetic average roughness Ra of the irregular concavo-convex structure formed on the surface of the transparent layer is preferably 0.01 to 20 μm, and more preferably 0.05 to 10 μm. When the arithmetic average roughness Ra is within the range, it is possible to obtain the image display transparent member 3 with a wide viewing angle of the projected image, which can be viewed without directly viewing the regular reflected light, and in which the graininess due to the uneven structure is suppressed. it can. If the arithmetic average roughness Ra is 10 μm or less, it is more preferable that the concave-convex structure does not get in the way when viewing the scene on the other side of the image display transparent member 3.

(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.

(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. 3A, a mold 61 in which a photocurable resin 36 is applied to the surface of the first transparent film 31 and an irregular concavo-convex structure is formed on the surface, 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. 3C, 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. 3D, 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. Note that either the first transparent layer 32 or the second transparent layer 34 may be disposed on the hollow layer side.

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 3 is preferably 1% or more, more preferably 5% or more, and more preferably 10% from the viewpoint of good visibility of the scene seen from the other side of the image display transparent member 3 when viewed from the observer side. The above is more preferable.
The transmittance of the image display transparent member 3 is preferably 90% or less, more preferably 85% or less, and even more preferably 75% or less, from the viewpoint of appropriately maintaining the contrast of the projected image.
The reflectance of regular reflection light on the first surface A of the image display transparent member 3 is preferably 5% or less, and more preferably 1% or less. By doing so, it is possible to prevent reflection of surrounding objects and light sources, which is preferable.

  The diffuse reflectance to the first surface A side of the image display transparent member 3 is preferably 5% or more, more preferably 15% or more, and particularly preferably 30% or more. When the reflectance is in the above range, especially in the case of reflected light that deviates by 0.044 rad (2.5 °) or more from the regular reflected light, if the reflectance around this is obtained, the change in human visibility is known. This is because sufficient screen gain can be obtained.

  The forward haze of the image display transparent member 3 is preferably 30% 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, and 5% or less is particularly preferable.

The rear haze of the image display transparent member 3 is preferably 5% or more when the image display transparent member 3 does not include a structure such as a flat mirror or a flat half mirror that increases the regular reflectance in terms of securing screen gain. 15% or more is more preferable, and 30% or more is more preferable.
The rear haze of the video display transparent member 3 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 of the image display transparent member 3 reaches, the image display transparent member 3 is beyond the view 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 3 can be seen. Such a video display transparent member 3 is suitable for use in an environment where ambient light exists.

  The refractive index difference between adjacent layers in the image display transparent member 3 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.

<Other embodiments>
In addition, the form of the transparent screen of this invention is not limited to the transparent screen of FIG. Hereinafter, the same components as those of the transparent screen of FIG.

As shown in FIG. 4, the reflective video display transparent member 3 in the transparent screen 1 may be a video display transparent member 4 a in which the first transparent base material 10 is omitted. Specific examples of the composite transparent display member 4a include, for example, an example in which the second transparent substrate 20 is an existing double-glazed glass plate or the like, that is, an image display unit 30 made of a light scattering sheet, an adhesive layer 22 For example, it is pasted on an existing multilayer glass or the like.
Moreover, in the transparent screen 1 of FIG. 1, the 2nd transparent base material 20 may be abbreviate | omitted.
Further, in the transparent screen 1 of FIG. 1, the image display unit 3 may be made of a transparent resin plate in which a light scattering material is dispersed.

In the reflective video display transparent member, the uneven structure of the reflective film 33 may be another structure. For example, using holograms or cholesteric liquid crystals with a non-uniform surface orientation such as irregularities and surfactants, louver structures, scatterers such as meshes, patterned reflectors, fine particles and fine pores Or a half mirror having an irregular concavo-convex structure.
In particular, the one using a half mirror is preferable because it has a structure that can easily improve transparency.

(Video display system with reflective 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 transparent screen 1 including a transparent plate 4 having a low radiation film on the hollow layer side, a hollow layer 2, and a reflective video display transparent member 3, and a reflective video display transparent member 3 side (A And a projector 200 installed on the side).
The projector 200 may be installed on the transparent plate 4 side (B side) having a low radiation film. However, when the video display transparent member 3 is used as a window glass, the video display transparent member 3 is on the indoor side. It is preferable to install.

(Mechanism of action)
In the reflective transparent screen 1 and the video display system using the same in the embodiment of the present invention, one of the pair of transparent members facing each other through the hollow layer has a low radiation film. Reflected. Further, the transmittance is reduced by the amount of light reflected by the low radiation film. For this reason, the amount of transmitted light of the projected image display light on the surface opposite to the surface on which the image is to be displayed is suppressed, and the virtual image reflected by the opposite scene is easier to see. The viewer can hardly see the projected image, and privacy can be protected. In addition, heat insulation and soundproofing are also good.
In the reflective transparent screen 1 according to the embodiment of the present invention and the video display system using the same, since one of the pair of transparent members facing each other through the hollow layer has a low radiation film, it enters the transparent member. Reflected images and scenes are reflected. Therefore, it is difficult for the image to be transmitted to the opposite side of the projector with respect to the transparent screen. Further, since a virtual image reflecting the surrounding scene is formed on the transparent member, it is further difficult to see the transmitted image, and the privacy of the observer who is projecting the image with the projector can be protected.

EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited by the following description.
Examples 1 and 3 are examples, and examples 2 and 4 are reference examples.
(Production 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. (Registered trademark) EA-F5003) A solution obtained by mixing 3 parts by mass of a photoinitiator (manufactured by BASF, Irgacure (registered trademark) 907) with respect to 100 parts by mass was applied to a thickness of 10 μm by a die coating method.
A white PET film (Toray, E20, arithmetic average roughness Ra: 0.23 μm) with an irregular concavo-convex structure formed on its surface is placed on the surface of the UV curable resin so that the concavo-convex structure is in contact with the UV curable resin. Overlaid on top.

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).

3 masses of photoinitiator (BASF, Irgacure (registered trademark) 907) with respect to 100 parts by mass of UV curable resin (Ossol (registered trademark) EA-F5003) manufactured on Osaka Gas Chemical Co., Ltd. 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 light-scattering sheet of Production Example 1 was obtained by irradiating 1000 mJ of ultraviolet light to cure the ultraviolet curable resin to form the second 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), light scattering sheet of Production 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 Production Example 1.

(Example 1)
The low emission film displays the image display transparent member of Production Example 1 and the glass plate having the low emission film (low emission film thickness of about 400 nm, low emission film structure: multilayer film of Ag and dielectric). A transparent screen of Example 1 was obtained by sealing with a sealing material (silicone-based sealing agent) with a spacer interposed therebetween so as to face the transparent member. Table 1 shows the performance of the reflective video display transparent member of Production Example 1 and the evaluation results of the transparent screen of Example 1.

(Example 2)
A reflective transparent screen of Example 2 was obtained using soda-lime glass (thickness 5 mm) without a low radiation film instead of the glass plate having a low radiation film in the image display transparent member of Example 1. The evaluation results of the transparent screen of Example 2 are shown in Table 1.

The evaluation criteria in the table are as follows.
(Scene visibility)
Visibility of a scene seen from the viewer side (observer X) beyond the transparent screen was evaluated 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)
The visibility of the image displayed on the transparent screen as viewed from the observer side (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.

(Visibility from the back)
The visibility of images observed from the opposite side of the transparent screen as viewed from the observer side (observer X) was evaluated according to the following criteria.
0: Video is not visually recognized.
1: A rough visual recognition is possible.

  The multilayer display transparent member of the present invention is useful as an image display transparent member used for window glass such as a window glass of a building, a showroom, an automatic door, and a vehicle window glass. Moreover, it is useful as a video display transparent member used for a showcase of goods, etc .; an exhibition case of art, etc .; a glass door; Moreover, it can be used as a window glass of a bathroom, a kitchen, etc. as an indoor window glass. 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. At this time, the image light projected from the projector is displayed to the observer so that the image can be visually recognized by the observer, and the display of the image is suppressed on the surface opposite to the observer so that the privacy is protected. It is useful as a transparent member, so-called transparent screen.

DESCRIPTION OF SYMBOLS 1 Transparent screen 2 Hollow layer 3 Reflection type image display transparent member 4 Transparent board 5 Spacer 10 1st transparent base material 20 2nd transparent base material 30 Video display part 31 1st transparent film 32 1st transparent layer 33 Reflective film 34 Second transparent layer 35 Second transparent film 36 Photo curable resin 37 Photo curable resin 61 Mold 200 Projector A First surface B Second surface L Image light L1 Reflected image L2 To observer X On the other hand, transmitted light to the back X observer

Claims (7)

A transparent screen consisting of a pair of transparent members facing each other through a hollow layer and separated by a spacer, wherein one of the pair of transparent members is a transparent plate having a low radiation film on one side, and the other is A transparent screen made of a reflective video display transparent member, wherein one of the following first and second surfaces faces the hollow layer.
Reflective video display transparent material:
A transparent member having 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. Is transparent to the viewer on the first surface side, and the image light projected from the first surface side is displayed as a video to the viewer on the first surface side so as to be visible. Element.   The transparent screen according to claim 1, wherein the low radiation film is at least one selected from the group consisting of a metal thin film, a semiconductor thin film, and a dielectric thin film.   The transparent screen according to claim 1 or 2, wherein the transparent screen has a total light transmittance of 1% or more and a haze of 4 to 50%.   The said image display transparent member has a transparent base material and an image display part, and the said image display part has any one structure selected from the group which consists of a hologram structure, an irregular uneven | corrugated structure, and a microarray lens structure. The transparent screen of any one of 1-3.   The transparent screen as described in any one of Claims 1-4 whose thickness of the said hollow layer is 4-20 mm.   The transparent screen according to any one of claims 1 to 5, wherein the spacer is disposed on a peripheral portion of the pair of transparent members, and an outer peripheral portion of the spacer is sealed with a sealant.   An image display system comprising: the transparent screen according to claim 1; and a projector installed at a position where image light can be projected onto the transparent screen.

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