JP2017227901A - Reflective screen, reflective screen sheet, and video image display system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflective screen capable of projecting a clear video image that is superior in terms of brightness and contrast even in an outdoor environment during the day or under bright lighting, and of sufficiently preventing transmission of projection light to an opposite side of the reflective screen (hot spot phenomenon), and to provide a reflective screen sheet, and a video image display system using the reflective screen and reflective screen sheet.SOLUTION: A reflective screen 1 is for displaying images using projection light, and comprises a transparent substrate 10, a view control filter 20 provided on top of the transparent substrate 10, and a scattering layer 30 provided on top of the view control filter 20 and configured to scatter the projection light. The scattering layer 30 contains a light scattering material 31 consisting of diamond particles and/or metallic inorganic particles.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a reflective screen and a reflective screen sheet.

  In the field of video display, video display devices represented by liquid crystal projectors are widely used as a means to easily obtain large screen images at low cost, and many people like mainly conferences and product presentations. It is often used when giving a presentation while viewing the same screen. Furthermore, digital signage (electronic signage) is used for product introductions and store advertisements.

  Digital signage does not require realization such as posters and billboards, so it enables real-time and low-cost freedom of expression. As one form of this, there is a method of projecting a projector window from the front using a window window of a show window or a store as a screen, which is a method suitable for large visual media. As such a screen, a reflective screen that has both moderate translucency and light diffusivity can be used to display clear large-screen images and movies while watching the outside scenery through the screen. .

  Patent Document 1 is composed of a substrate, a transparent thin film layer provided on the substrate, and a light scatterer having a median diameter of 0.01 to 1 μm included in the transparent thin film layer. A transmission screen which is a diamond fine particle obtained by subjecting the obtained nanodiamond having a graphite phase to oxidation treatment is disclosed, and it is described that it has good scattering reflectivity without impairing transmission visibility.

Patent Document 2 discloses a transmission projection screen in which a metal thin film layer and a light diffusing layer are laminated on a thermoplastic resin film, and the light diffusing layer includes a thermoplastic resin and 10 to 60% by mass of light diffusing particles. It is disclosed that it is excellent in color sharpness (high contrast effect) and hot spot suppression effect of a transmitted image in a bright environment. The metal thin film layer is composed of: 1) a low refractive index layer having a refractive index of 1.5 or less composed of one or more selected from Au, Ag, Cu, Al and SiO ₂ ; 2) WO ₃ , In ₂ O ₃ , ZrO ₂ , ZnO, SnO ₂ , and TiO _{2 are} selected from one or more kinds of multi-layer structure composed of a high refractive index layer having a refractive index of 1.65 or more, and described as having a heat shielding effect due to heat ray reflection. doing. The transmissive projection screen is used to project a projector from the back of the screen, and is different from the reflective screen used to project from the front of the screen.

JP 2011-1113068 A Japanese Patent Application Laid-Open No. 2016-9149

  However, when the transmissive screen described in Patent Document 1 is used as a reflective screen in the daytime or under bright illumination, the brightness and contrast of the projected image is not sufficient, and further improvements are desired. In addition, when the transmissive projection screen described in Patent Document 2 is used as a reflective screen in the daytime or under bright illumination, a projection image with high brightness and high contrast cannot be obtained, which is not suitable as a reflective screen. It is sufficient, and the hot spot suppression effect becomes insufficient as the light source illuminance of the projector increases, and further improvement is desired.

  Accordingly, an object of the present invention is to provide a clear image with excellent brightness and contrast even in the daytime or under bright lighting, and transmit the projected light to the opposite side of the reflective screen (hot spot). (Phenomenon) is sufficiently prevented, and a reflective screen sheet and a video display system using the same are provided.

  As a result of diligent research in view of the above object, the present inventors have found that light scattering comprising diamond particles and / or metallic inorganic particles capable of reflecting and scattering projected images with high efficiency on a transparent support. By providing a visual field control filter on the back side of the scattering layer as viewed from the projection side on the reflective screen having a scattering layer having a body, a clear image with excellent brightness and contrast can be projected, and the projection light The present inventors have found that a reflection type screen can be obtained in which transmission (hot spot phenomenon) to the opposite side of the reflection type screen is sufficiently prevented.

In other words, the first reflective screen of the present invention that displays an image by projected light is:
A transparent substrate, a visual field control filter provided on the transparent substrate, and a scattering layer that scatters the projection light provided on the visual field control filter,
The scattering layer contains a light scatterer composed of diamond particles and / or metal-based inorganic particles.

The second reflective screen of the present invention that displays an image by the projected light is:
A transparent substrate, a scattering layer for scattering the projection light provided on one surface of the transparent substrate, and a visual field control filter provided on the other surface of the transparent substrate,
The scattering layer contains a light scatterer composed of diamond particles and / or metal-based inorganic particles.

  The visual field control filter is a louver layer in which a light transmission layer and a light shielding layer are alternately and repeatedly arranged, and a joint surface between the light transmission layer and the light shielding layer is parallel to the thickness direction of the louver layer or It is preferable to incline at a predetermined angle.

  The transparent substrate is preferably made of glass or a transparent polymer resin.

  The first and second reflective screens of the present invention preferably have a hard coat layer on the surface.

The first reflective screen sheet of the present invention is a reflective screen sheet that displays an image by projection light,
A transparent transparent sheet made of a transparent polymer resin, a visual field control filter provided on the transparent sheet, and a scattering layer for scattering the projection light provided on the visual field control filter ,
The scattering layer contains a light scatterer composed of diamond particles and / or metal-based inorganic particles.

The second reflective screen sheet of the present invention is a reflective screen sheet for displaying an image by projection light,
A flexible transparent sheet made of a transparent polymer resin, a scattering layer for scattering the projection light provided on one surface of the transparent sheet, and a visual field control provided on the other surface of the transparent sheet And a filter
The scattering layer contains a light scatterer composed of diamond particles and / or metal-based inorganic particles.

  The video display system of the present invention has a screen having the above-described reflective screen or reflective screen sheet, a projection device that projects video or a moving image on the screen, and a function of generating sound using the screen as a vibrating body. And a vibration speaker.

  In the video display system of the present invention, it is preferable that the screen has a touch sensor function.

  The video display system of the present invention preferably further includes a sound collecting device for collecting surrounding sounds and a phase inverter for inverting the phase of the sound.

  The video display system of the present invention preferably further has a communication function.

  The reflective screen of the present invention has a scattering layer having a light scatterer composed of diamond particles and / or metal inorganic particles, and a visual field control filter provided on the rear side of the scattering layer as viewed from the projection side. This makes it possible to project the projected image clearly and with high brightness in any environment, day or night, and the projected light is not directly transmitted to the opposite side of the screen, so stores, trains, cars, ships, airplanes, It can be preferably applied to window glass such as an elevator.

  Since the reflective screen sheet of the present invention has the same layer structure as the reflective screen of the present invention, the same function as that of the reflective screen of the present invention can be achieved by sticking to a sheet glass, a transparent resin plate or the like. Can be easily obtained, and can be easily removed when it is no longer needed.

It is a schematic cross section which shows an example of the 1st aspect of the reflection type screen of this invention. It is a schematic cross section which shows the other example of the 1st aspect of the reflection type screen of this invention. It is a schematic cross section which shows the further another example of the 1st aspect of the reflection type screen of this invention. It is a graph which shows the angle dependence of the transmittance | permeability of a visual field control filter. It is a schematic cross section which shows the structure of a louver layer. It is a schematic diagram cross section which shows the relationship between the incident angle of a projection light, and the structure of a louver layer. It is a schematic cross section which shows an example of the 2nd aspect of the reflection type screen of this invention. It is a schematic cross section which shows the other example of the 2nd aspect of the reflection type screen of this invention. It is a schematic cross section which shows the further another example of the 2nd aspect of the reflection type screen of this invention. It is a schematic cross section which shows an example of the 1st aspect of the sheet | seat for reflective screens of this invention. It is a schematic cross section which shows the other example of the 1st aspect of the sheet | seat for reflective screens of this invention. It is a schematic cross section which shows an example of the 2nd aspect of the sheet | seat for reflective screens of this invention. It is a schematic cross section which shows the other example of the 2nd aspect of the sheet | seat for reflective screens of this invention. It is a schematic diagram which shows an example of a video display system. It is a schematic diagram which shows the other example of a video display system. It is a schematic diagram which shows the relationship between the reflection type screen and projection apparatus in an Example.

  Hereinafter, the present invention will be described in detail according to an embodiment thereof.

[1] Reflective Screen (1) First Aspect FIG. 1 shows a first aspect of a reflective screen that displays an image by projection light. The reflective screen 1 has a transparent substrate 10, a visual field control filter 20 provided on the transparent substrate 10, and a scattering layer 30 that scatters the projection light provided on the visual field control filter 20. The scattering layer 30 contains a light scatterer 31 made of diamond particles and / or metal-based inorganic particles.

  The reflective screen of the first aspect projects projection light from the scattering layer 30 side to display an image on the scattering layer 30, and observes the image from the same side as the projection light (scattering layer 30 side). . Diamond (refractive index 2.4) and metal-based inorganic particles contained in the scattering layer 30 have a higher refractive index than glass and polymer resin, and thus work as a good light scatterer and exhibit a high scattering effect by Mie scattering. Therefore, the viewing angle dependency is small and an image can be observed from a wide range. Furthermore, the visual field control filter 20 that removes light other than a specific angle component provided on the transparent substrate 10 absorbs projection light and prevents direct transmission to the opposite side of the screen. By reducing the intensity of visible light incident from the side opposite to the viewing side while maintaining the brightness and contrast of the projected image (reflected image), it becomes possible to observe a clear image This eliminates the hot spot phenomenon when observed from the opposite side of the screen.

The field-of-view control filter transmits light incident at an incident angle within a predetermined range (hereinafter, also referred to as “transmission angle range”), but is outside the range (hereinafter referred to as “non-transmission angle range”). The light incident at an incident angle of “.” Is not transmitted. The incident angle is an angle with respect to the normal direction of the visual field control filter.
For this reason, by arranging the projection device so that the projection light is incident on the reflection type screen at an incident angle in the non-transmission angle range, the projection light does not pass through the reflection type screen, so the observation is performed from the opposite side of the screen. This eliminates the hot spot phenomenon and prevents the projected video and video from being observed from the opposite side of the screen. On the other hand, when the observation side is observed from the projection side or the opposite side of the projection side so that the visual axis falls within the transmission angle region, the opposite side of the screen can be observed. In order to exert such an effect, the visual field control filter 20 is provided on the rear side of the scattering layer as viewed from the projection side.

  As shown in FIG. 2, the reflective screen of the first aspect may be a reflective screen 2 having a configuration in which another transparent substrate 10 ′ is further provided on the scattering layer 30 in the reflective screen 1. In this case, the image is projected from the transparent substrate 10 'side and observed from the same side. Further, as shown in FIG. 3, a reflective screen 3 having a configuration in which a hard coat layer 40 is further provided on the scattering layer 30 may be used. Also in this case, the image is projected from the hard coat layer 40 side and observed from the same side. Thus, by providing another transparent substrate 10 ′ or the hard coat layer 40 on the scattering layer 30, the scattering layer 30 can be protected. The light scatterer 31 may be included in the hard coat layer 40. Further, instead of providing the hard coat layer 40, the scattering layer 30 may contain a hard coat agent.

  In the reflective screens 1, 2, and 3 of the first aspect, the scattering layer 30 containing the light scatterer 31 may be provided in direct contact with the visual field control filter 20, or an adhesive (not shown). It may be provided via. Further, the light scatterer may be contained in the adhesive. An intermediate layer made of a transparent support or the like may be provided between the scattering layer 30 and the visual field control filter 20. In the reflective screen 2, the scattering layer 30 containing the light scatterer 31 may be provided in direct contact with the transparent substrate 10 ′, or may be provided via an adhesive (not shown). . In the reflective screen 3, the scattering layer 30 containing the light scatterer 31 may be provided in direct contact with the hard coat layer 40, or may be provided via an adhesive (not shown). .

  When the scattering layer 30 containing the light scatterer 31 is in contact with air as in the reflective screen 1, that is, when the scattering layer 30 forms the outermost layer, as shown in FIG. It is preferable that the light scatterer 31 exists in a state where a part of the light scatterer 31 protrudes from the surface.

(A) Transparent substrate The transparent substrate is preferably made of glass or a polymer resin. The transparent substrate may be a flat plate or a curved plate. Further, it may be a flexible sheet. As glass, oxide glass such as silicate glass, phosphate glass and borate glass is practical, especially silicate glass, alkali silicate glass, soda lime glass, potash lime glass, lead glass, barium. Silicate glasses such as glass and borosilicate glass are preferred.

As the polymer resin, those having excellent visible light permeability are preferable, such as polyvinyl butyral resin, polyester resin, acrylic resin, acrylic urethane resin, polyester acrylate resin, polyurethane acrylate resin, epoxy acrylate resin, urethane. Resin, epoxy resin, polycarbonate resin, cellulose resin, acetal resin, vinyl resin, polyethylene resin, polystyrene resin, polypropylene resin, polyamide resin, polyimide resin, melamine resin, phenolic resin Further, thermoplastic resins such as silicone resins and fluorine resins, thermosetting resins, ionizing radiation curable resins, and the like can be used. A plasticizer may be added to the polymer resin. Examples of the plasticizer include triethylene glycol-bis-2-ethylbutyrate.
Although the thickness of glass or polymer resin is not specifically limited, 10 micrometers-50 mm are preferable from a viewpoint of intensity | strength and economical efficiency, and 20 micrometers-30 mm are preferable.

(B) Field-of-view control filter The field-of-view control filter is limited as long as it has a characteristic of transmitting light incident from the incident angle in the transmission angle range but not transmitting light incident from the incident angle in the non-transmission angle range. Anything is acceptable. The viewing angle control filter, centered on _{θ 0 [(θ 0 -α 1} ) ~ (θ 0 + α 2)] is for incident light at an incident angle in the range of, but _{transmits, [(θ 0 -α 1)} ~ (θ _{0 +} α _2)] that is light at an incident angle of the angle range theta _alpha was out of the range of _(θ α <θ ₀ -α ₁ and _{θ α> θ 0 + α 2} ) has the property of not transmitting preferable.
For example, as shown in FIG. 4, the transmittance of such a visual field control filter has the highest transmittance at θ ₀ , and the transmittance decreases as the distance from θ ₀ increases, and an angle smaller than (θ ₀ −α ₁ ) and The angle dependency is such that the transmittance is lowest at an angle larger than (θ ₀ + α ₂ ). Since the light incident from the incident angle in the angle range where the transmittance is the lowest is substantially not transmitted, the occurrence of hot spots on the opposite side of the screen due to the projection light can be prevented.

θ ₀ and α (α ₁ or α ₂ ) can be set as appropriate depending on the design of the visual field control filter, and what angle should be determined may be determined as appropriate according to the purpose of use of the reflective screen. θ ₀ is preferably in the range of ₀ to 60 °, more preferably in the range of 0 to 50 °. The angle α is preferably in the range of greater than 0 ° and less than 90 °, and more preferably in the range of 10 to 80 °. The transmittance when light incident at θ ₀ passes through this visual field control filter is preferably 60% or more, more preferably 70% or more, and most preferably 80% or more. The transmittance when light incident at an incident angle in the angle region θ _α (θ _α <θ ₀ −α ₁ and θ _α > θ ₀ + α ₂ ) passes through the visual field control filter is 10% or less. Preferably, it is 5% or less, more preferably 2% or less.

As the visual field control filter 20 having such characteristics, as shown in FIG. 5A, a louver in which light transmission layers 21a and light shielding layers 21b are alternately and repeatedly arranged in a plane direction and in a certain direction. Layer 21 is preferred. The louver layer 21 is configured such that the bonding surface 21 c between the light transmission layer 21 a and the light shielding layer 21 b is parallel to the thickness direction of the louver layer 21, that is, the bonding surface 21 c is the louver layer 21. It is orthogonal to the plane. As shown in FIG. 5B, the joint surface 22c between the light transmission layer 22a and the light shielding layer 22b is inclined at a predetermined inclination angle x (> 0 °) with respect to the thickness direction of the louver layer 22. It may be configured as follows. Here, the inclination angle x corresponds to θ ₀ .

The visual field control filter 20 composed of the louver layer 21 or the louver layer 22 thus designed has a direction parallel to the joint surface 21c (22c) between the light transmission layer 21a (22a) and the light shielding layer 21b (22b). The light in the angular range up to the light L _α having the inclination of α ₁ or α ₂ with respect to the joint surface with respect to the light L ₀ (corresponding to the light incident at θ ₀ ) is transmitted, but the angle is out of this range (corresponding to light incident at an angle range theta _alpha) light from pass has a characteristic such does not transmit. The viewing angle control filter 20 having such a louver layer 21 (22), it is restricted around the ₀ angle theta to transmit light from the (theta _{0-.alpha. 1)} in the range of (θ ₀ + α _2). In the case of the louver layer 21 configured such that the joint surface 21c between the light transmission layer 21a and the light shielding layer 21b is parallel to the thickness direction of the louver layer 21, α ₁ = α ₂ (FIG. 5). In (a), it is expressed as “α”).

Hereinafter, a more specific embodiment will be described, where the thickness of the light transmission layer 21a (22a) is Wa, the thickness of the light shielding layer 21b (22b) is Wb, and the thickness of the louver layer 21 (22) is t. The transmittance of the light L _{0 in} the direction parallel to the joint surface 21c (22c) between the light transmission layer 21a (22a) and the light shielding layer 21b (22b) becomes higher as the light transmission layer 21a (22a) is thicker. It is proportional to / (Wa + Wb). Therefore, in order to increase the transmittance of light from the incident angle in the transmission angle range that passes through the visual field control filter 20 including the louver layer 21 (22), the thickness Wa of the light transmission layer 21a (22a) is increased. It is preferable to reduce the thickness Wb of the light shielding layer 21b (22b).

Range of incident angles of light that can be transmitted through the louver layer 21 whose inclination angle x formed by the joining surface 21c and the thickness direction of the louver layer 21 is 0 ° [(θ ₀ −α) to (θ ₀ + α) ] Depends on the thickness Wa of the light transmission layer 21a and the thickness t of the louver layer 21:
α = tan ^-1 (Wa / t) (x = θ ₀ = 0 °)
It depends on α required by Further, the range of incident angles of light that can be transmitted through the louver layer 22 whose inclination angle x formed by the joining surface 22c and the thickness direction of the louver layer 22 is larger than 0 ° [(θ ₀ −α ₁ ) to (θ ₀ + α ₂ )] has the following formula:
α ₁ = tan ^-1 ((Wa × cos (x)) / (t−Wa × sin (x))), and α ₂ = tan ⁻¹ ((Wa × cos (x)) / (t + Wa × sin ( x)))
It is determined by α ₁ and α _{2 obtained} by

The thickness t of the louver layer 21 (22) is preferably 150 to 2500 μm, and the thickness Wa of the light transmission layer 21a (22a) is preferably 10 to 2600 μm, and more preferably 15 to 2300 μm. Most preferably, it is 20-2000 micrometers. The thickness Wb of the light shielding layer 21b (22b) is preferably 2 to 500 μm, more preferably 5 to 300 μm, and most preferably 10 to 200 μm so as not to adversely affect human visual acuity. . By adjusting Wa, Wb, and t within the above ranges, α is preferably set in the range of 0.5 to 85 ° (when x = 0 °). The inclination angle x formed by the joint surface 22c between the light transmission layer 22a and the light shielding layer 22b and the thickness direction of the louver layer 22 is appropriately set depending on the angle at which the projection light enters the screen. For example, when the projection light is irradiated almost perpendicularly to the screen, the inclination angle x (angle θ ₀ ) formed with the thickness direction of the louver layer 22 is increased so that the projection light does not pass through the reflective screen. Like that. In this case, the incident angle at which the projection light can be incident is in an angle range of [(x−α ₁ ) to (x + α ₂ )]. Therefore, in order to block the projection light, x is more than α _1. It is preferable to set x, Wa, and t so as to increase.

For example, when the projection light is incident in parallel to the thickness direction of the louver layer (incidence angle 0 ° to the louver layer), the projection light is transmitted through the louver layer (thickness t ₁ ) as shown in FIG. by constituting the light shielding layer 22b at an inclination angle x ₁ and interval Wa ₁ so as not to obtain a viewing angle control filter, as projected light at an incident angle of 0 ° is not transmitted through the louver layer (thickness t ₁₎ be able to. 6A, in order to increase the transmittance, as shown in FIG. 6B, when the distance Wa ₂ (Wa ₂ > Wa ₁ ) of the light shielding layer 22b is increased, the incidence is increased. Although the incident light incident at an angle of 0 ° is transmitted through the louver layer (thickness t ₁ ), as shown in FIG. 6C, the light shielding layer 22b at an inclination angle x ₂ larger than the inclination angle x _1. By configuring this, it is possible to obtain a visual field control filter that prevents the projection light from passing through the louver layer (thickness t ₁ ) even when the interval Wa ₂ between the light shielding layers 22b is widened. Even further FIG 6 (b) to indicate configuration and the same angle of inclination _{x 1} and interval _{Wa 2 (Wa 2> Wa 1} ), as shown in FIG. 6 (d), the thickness of the louver layer than _{t 1} By setting the thickness t2 to be larger, it is possible to obtain a visual field control filter that prevents the projection light from passing through the louver layer.

As the visual field control filter, one type or two or more types of louver layers may be used in an overlapping manner. For example, a louver layer with an inclination angle x ₁ = 0 ° has an angle dependency with respect to light in a direction perpendicular to the joint surface between the light transmission layer and the light shielding layer, but with respect to light in a parallel direction. Since there is no angle dependency, the louver layer is used in such a manner that the bonding surfaces of the light transmission layer and the light shielding layer are overlapped with each other, so that either the lateral direction or the vertical direction of the louver layer is used. It is also possible to give the angle dependency of the transmitted light. Further by only the tilt angle x ₁ 1 sheet out of two this time is set to a value greater than 0 °, it is possible to control in an oblique direction to the transmission of light with respect to the louver layer.

Furthermore, when the incident light is incident at an angle λ (incident angle λ) with respect to the thickness direction of the louver layer, the configuration shown in FIG. 6A (inclination angle x ₁ , interval Wa _1, and thickness t _1). 6 (e), as shown in FIG. 6 (e), even if the inclination angle of the light shielding layer 22b is set to an inclination angle x ₃ (x ₁ > x ₃ ) smaller than x _{1, the} projection light is reflected in the louver layer ( The distance Wa ₁ and the thickness t ₁ ) can be prevented from being transmitted.

  The louver layer is formed, for example, by forming a transparent silicone rubber composition and a silicone rubber composition colored with carbon black or the like into a sheet having a predetermined thickness to form a plurality of light transmitting layers and light shielding layers, The plurality of light transmission layers and the light shielding layers are alternately laminated, and the integrated block body is manufactured by pressurizing and heating, and the block body is sliced. At this time, by slicing in a direction perpendicular to the bonding surface between the light transmission layer and the light shielding layer, the bonding surface between the light transmission layer and the light shielding layer becomes parallel to the thickness direction of the louver layer. The louver layer 21 is formed, and the joint surface between the light transmission layer and the light shielding layer is inclined at a predetermined angle with respect to the thickness direction of the louver layer by slicing obliquely with respect to the joint surface. A louver layer 22 is formed.

  As another method for producing a louver layer, a plurality of parallel straight grooves are formed in a highly transparent film made of a silicone rubber compound as a light transmission layer so as to penetrate in the thickness direction. Next, there is a method in which a silicone rubber compound colored with a black material such as carbon black is filled in the groove as a light shielding layer and then cured by heat vulcanization.

  As the visual field control filter constituting the louver layer, a viewing angle control film VC-FILM manufactured by Shin-Etsu Polymer Co., Ltd. can be preferably used. As the visual field control filter, a film that functions as a visual field control filter only when the power is turned on and functions as a transparent film when the power is turned off may be used.

(C) Scattering layer As diamond particles, natural diamond particles or artificial diamond particles can be used. Examples of the artificial diamond include single crystal diamond, polycrystalline diamond, and the like. For example, those obtained by oxidizing single crystal nanodiamond having a graphite phase obtained by an explosion method are preferable. Nanodiamond obtained by the explosion method (nanodiamond having a graphite phase) has a core / shell structure in which the surface of diamond is covered with graphite-based carbon, and is therefore colored black. Therefore, it is preferable to obtain diamond particles from which the graphite phase is almost removed by performing an oxidation treatment.

  In order to increase the affinity with a solvent or the like, the surface of diamond particles may be modified with silicon or fluorine. In particular, fluorinated diamond particles obtained by fluorinating diamond particles are excellent in dispersibility in a polymer resin and are suitable as the light scatterer.

The diamond particles are not particularly limited, but the specific gravity is preferably larger than 3.38 g / cm ³ , and preferably 3.5 g / cm ³ or less. The diamond obtained by the explosion method is a particle having a median diameter of 10 to 250 nm (dynamic light scattering method) in which nano-sized diamond having a diameter of about 1 to 10 nm is aggregated. Further, it is preferable to use it after aggregation.

  The median diameter of the diamond particles is preferably 0.01 to 1 μm. In particular, the median diameter of diamond particles is preferably 1 μm or less, more preferably 0.7 μm or less, and even more preferably 0.4 μm or less from the viewpoint of further improving contrast. The median diameter of the diamond particles is preferably 0.01 μm or more, more preferably 0.03 μm or more, from the viewpoint of further improving the brightness.

  As the metal-based inorganic particles, metal oxides or particles other than metal oxides are used. Examples of the metal oxide include zirconium oxide, titanium oxide, zinc oxide, aluminum oxide, and cerium oxide. Examples of the metal oxide other than the metal oxide include barium titanate and barium sulfate. In particular, it is preferable to use zirconium oxide, titanium oxide particles, cerium oxide particles, barium titanate, and barium sulfate particles from the viewpoints of projection light scattering, particle aggregability, and production cost. These metallic inorganic particles may be used alone or in combination of two or more. Furthermore, you may use in combination with the said diamond particle.

  Commercially available metal-based inorganic particles may be used. For example, as zirconium oxide particles, SZR-W, SZR-CW, SZR-M, SZR-K (above, manufactured by Sakai Chemical Industry Co., Ltd., As a titanium oxide particle such as a trade name), GT-10W2 (manufactured by Sakai Chemical Co., Ltd.) and the like can be suitably used.

  The metal-based inorganic particles may be present alone in the glass or polymer resin, but it is preferable that at least a part of the particles is aggregated. Whether the primary particles are present alone or in an aggregated state, the median diameter of the metal-based inorganic particles is preferably 0.01 to 1 μm. In particular, the median diameter of the metal-based inorganic particles is preferably 1 μm or less, more preferably 0.7 μm or less, and even more preferably 0.4 μm or less from the viewpoint of further improving contrast. Further, the median diameter of the metal-based inorganic particles is preferably 0.01 μm or more, and more preferably 0.03 μm or more from the viewpoint of further improving the brightness.

  The scattering layer containing a light scatterer is preferably formed by dispersing the light scatterer in glass or a polymer resin that can be used for the transparent substrate, and particularly preferably formed of a polymer resin. When both the transparent substrate and the scattering layer are made of a polymer resin, these resins may be the same or different. Although the thickness of a scattering layer is not specifically limited, From a viewpoint of improving a contrast and brightness more, it is preferable that it is 0.5-1000 micrometers, it is more preferable that it is 1-500 micrometers, and it is further 2-400 micrometers. preferable.

  The content of the light scatterer in the glass or polymer resin is 0.01 to 35% by mass, preferably 0.02 to 34% by mass with respect to the glass or polymer resin, from the viewpoint of further improving contrast and brightness. More preferably, it is 0.05-33 mass%, More preferably, it is 0.1-30 mass%.

  The scattering layer may be formed by coating a resin solution containing a light scatterer on the surface of a visual field control filter provided on a transparent substrate, or made of a resin containing a light scatterer prepared in advance. A sheet may be formed on the visual field control filter. When the scattering layer is formed by coating, it is preferable to use a heat or UV curable resin. Examples of the coating method include a bar coating method, a dip coating method, a flow coating method, a spray coating method, a spin coating method, and a roller coating method.

(D) Hard coat layer The reflective screen may be provided with a hard coat layer on the surface. The hard coat layer is formed by painting a hard coat agent on the scattering layer. An intermediate layer for improving adhesion may be provided between the hard coat layer and the scattering layer. Examples of the coating method include methods such as bar coating, dip coating, flow coating, spray coating, spin coating, and roller coating.

(2) Second Aspect FIG. 7 shows a second aspect of the reflective screen that displays an image by projection light. The reflective screen 4 includes a transparent substrate 10, a scattering layer 30 that scatters the projection light provided on one surface of the transparent substrate, and a visual field control filter 20 that is provided on the other surface of the transparent substrate. And the scattering layer 30 includes a light scatterer 31 composed of diamond particles and / or metal-based inorganic particles. It is preferable to further provide a transparent substrate 10 ″ on the visual field control filter 20.

  Similar to the reflective screen 1, the reflective screen 4 projects projected light from the scattering layer 30 side to display an image, and observes the image from the same side as the projected light (scattering layer 30 side). Diamond (refractive index 2.4) and metal-based inorganic particles contained in the scattering layer 30 have a higher refractive index than glass and polymer resin, and thus work as a good light scatterer and exhibit a high scattering effect by Mie scattering. Therefore, the viewing angle dependency is small and an image can be observed from a wide range. Furthermore, the visual field control filter 20 provided on the opposite side of the transparent substrate 10 with respect to the scattering layer 30 absorbs the projection light and prevents it from being directly transmitted to the opposite side of the screen. By reducing the intensity of visible light incident from the side opposite to the viewing side, the brightness and contrast of the projected image (reflected image) can be increased, and a clear image can be observed. The hot spot phenomenon when observed from the opposite side is eliminated.

  It is preferable that a transparent substrate 10 ″ is further provided on the visual field control filter 20 to serve as a protective layer for the visual field control filter 20. Since the transparent substrate 10, the visual field control filter 20, and the scattering layer 30 constituting the reflective screen 4 are the same as those of the reflective screen 1, detailed description thereof is omitted.

  As shown in FIG. 8, the reflective screen according to the second aspect may be a reflective screen 5 having a configuration in which a transparent substrate 10 ′ is further provided on the scattering layer 30 in the reflective screen 4. Also in this case, the image is projected from the transparent substrate 10 'side and observed from the same side. Further, as shown in FIG. 9, a reflective screen 6 having a configuration in which a hard coat layer 40 is further provided on the scattering layer 30 may be used. Also in this case, the image is projected from the hard coat layer 40 side and observed from the same side. Further, the light scatterer may be contained in the hard coat layer, or the layer containing the light scatterer may be used as the hard coat layer. Thus, by providing the transparent substrate 10 ′ or the hard coat layer 40 on the scattering layer 30, the scattering layer 30 can be protected. The transparent substrate 10 ′ and the transparent substrate 10 ″ can use the same material as that of the transparent substrate 10. Further, since the hard coat layer 40 is the same as that of the reflective screen 1, detailed description thereof is omitted.

  In the reflective screens 4, 5, 6 of the second aspect, the scattering layer 30 containing the light scatterer 31 may be provided in direct contact with the transparent substrate 10, or an adhesive (not shown) may be provided. It may be provided via. Similarly, in the reflective screen 5, the scattering layer 30 containing the light scatterer 31 may be provided in direct contact with the transparent substrate 10 ′ or via an adhesive (not shown). Alternatively, the visual field control filter 20 may be provided in direct contact with the transparent substrate 10 '' or may be provided via an adhesive (not shown). In the reflective screen 6, the scattering layer 30 containing the light scatterer 31 may be provided in direct contact with the hard coat layer 40 or may be provided via an adhesive (not shown). good.

[2] Reflective Screen Sheet (1) First Aspect FIG. 10 shows a first aspect of a reflective screen sheet that displays an image by projection light. The reflective screen sheet 101 is a sheet for obtaining a reflective screen for displaying an image by projection light, and has a flexible transparent sheet 11 made of a transparent polymer resin and the transparent sheet 11. Light having a visual field control filter 20 provided and a scattering layer 30 that scatters the projection light provided on the visual field control filter, and the scattering layer 30 is light composed of diamond particles and / or metal-based inorganic particles. The scatterer 31 is contained.

  This reflective screen sheet 101 is obtained by limiting the transparent substrate 10 of the reflective screen 1 (first aspect of the reflective screen) to a flexible transparent sheet 11 made of a transparent polymer resin. The configurations of the visual field control filter 20 and the scattering layer 30 are the same as those of the reflective screen 1. The transparent polymer resin that can be used for the reflective screen sheet 101 may be any material as long as it has flexibility, and the same material as the transparent substrate 10 mentioned in the reflective screen 1 should be used. Can do. Similar to the reflective screen 1, the reflective screen sheet 101 projects an image from the scattering layer 30 side and observes from the same side.

  As shown in FIG. 11, the reflective screen sheet of the first aspect may be a reflective screen sheet 102 having a configuration in which a hard coat layer 40 is further provided on the scattering layer 30 in the reflective screen sheet 101. good. The reflective screen sheet 102 is obtained by limiting the transparent substrate of the reflective screen 3 to a flexible transparent sheet 11 made of a transparent polymer resin, and includes a visual field control filter 20, a scattering layer 30, and a hard coat. The configuration of the layer 40 is the same as that of the reflective screen 3. Also in this case, the image is projected from the hard coat layer 40 side and observed from the same side. Thus, by providing the hard coat layer 40 on the scattering layer 30, the scattering layer 30 can be protected. The light scatterer 31 may be included in the hard coat layer 40. Further, instead of providing the hard coat layer 40, the scattering layer 30 may contain a hard coat agent.

  These reflective screen sheets 101 and 102 are attached to a transparent substrate like a plate glass, and the transparent substrate is used as a reflective screen. By using such a method, for example, these reflective screen sheets are pasted on a sheet glass that is usually used as a show window for some event to form a temporarily transparent reflective screen. After the event is finished, it is possible to use such a method that the reflective screen sheet attached to the surface of the show window is peeled off and returned to the original show window.

(2) Second Aspect FIG. 12 shows a second aspect of the reflective screen sheet that displays an image by projection light. The reflective screen sheet 103 is a sheet for obtaining a reflective screen for displaying an image by projection light, and has a flexible transparent sheet 11 made of a transparent polymer resin, and one of the transparent sheets. A scattering layer 30 for scattering the projection light provided on the surface, and a visual field control filter 20 provided on the other surface of the transparent sheet, wherein the scattering layer 30 is diamond particles and / or metal-based inorganic particles. It contains the light-scattering body 31 which consists of. It is preferable to provide a flexible transparent sheet 11 ′ made of a transparent polymer resin on the visual field control filter 20.

  This reflective screen sheet 103 is obtained by limiting the transparent substrate 10 of the reflective screen 4 (second aspect of the reflective screen) to a flexible transparent sheet 11 made of a transparent polymer resin. The configurations of the visual field control filter 20 and the scattering layer 30 are the same as those of the reflective screen 4. The transparent polymer resin that can be used for the reflective screen sheet 103 may be any material as long as it has flexibility, and the same material as the transparent substrate 10 mentioned in the reflective screen 4 should be used. Can do. Similar to the reflective screen 4, the reflective screen sheet 103 projects an image from the scattering layer 30 side and observes from the same side.

  As shown in FIG. 13, the reflective screen sheet of the second aspect may be a reflective screen sheet 104 having a configuration in which a hard coat layer 40 is further provided on the scattering layer 30 in the reflective screen sheet 103. good. The reflective screen sheet 104 is obtained by limiting the transparent substrate 10 of the reflective screen 6 to a flexible transparent sheet 11 made of a transparent polymer resin, and the configuration of the scattering layer 30 and the hard coat layer 40. Is similar to the reflective screen 6. Also in this case, the image is projected from the hard coat layer 40 side and observed from the same side. Further, the light scatterer may be contained in the hard coat layer, or the layer containing the light scatterer may be used as the hard coat layer. Thus, by providing the hard coat layer 40 on the scattering layer 30, the scattering layer 30 can be protected.

  These reflective screen sheets 103 and 104 are pasted on a transparent substrate like a plate glass, and the transparent substrate is used as a reflective screen. By using such a method, for example, these reflective screen sheets are pasted on a sheet glass that is usually used as a show window for some event to form a temporarily transparent reflective screen. After the event is finished, it is possible to use such a method that the reflective screen sheet attached to the surface of the show window is peeled off and returned to the original show window.

[3] Video Display System (1) Overall Configuration A video display system can be constructed by using the above-described reflective screen (or reflective screen sheet). As an image display system, for example, as shown in FIG. 14, a reflective screen 201, a projection device 202 that projects an image or a moving image on the screen, and a vibration speaker having a function of generating sound using the screen as a vibrating body. And 203. The projection device 202 is connected to the video output unit, and the vibration speaker 203 is connected to the audio output unit, and is controlled by the system control unit. The vibration speaker 203 may not be provided when not necessary.

  As shown in FIG. 15, the video display system may further include a sound collection device 204 that collects peripheral sounds. The sound collector 204 is connected to the voice input unit and controlled by the system control unit. Further, in addition to the sound collecting device 204, a phase inverter (not shown) for inverting the phase of the sound may be included.

  The video display system may further have a communication function. By having the communication function, it is possible to project images and moving images distributed through a LAN line or the like, and to transmit various information input by the user to the server and to aggregate them.

(2) Reflective screen As the reflective screen used in the video display system, a reflective screen obtained using the above-described reflective screen and the reflective screen sheet can be used.

(3) Projection Device The video display system includes a projection device 202 for projecting images, moving images, and the like. The projection device 202 processes data stored in a medium such as a Blu-ray disc (BD), DVD, memory (memory stick, SD card, etc.) or data distributed via a LAN line in an image output unit to produce an image and a moving image. Project onto the screen. The electrical signal sent from the video output unit to the projection device 202 may be transmitted by wire or by a wireless device.

  The distance between the video apparatus and the reflective screen is not particularly limited, but it is preferable to project from as close a distance as possible because of space and the like. The distance between the video device and the reflective screen is preferably 10 cm to 2 m, and more preferably 15 cm to 1 m. When projecting from a close distance, the optical axis is preferably projected at an angle of 90 ° or less with respect to the reflective screen, and more preferably projected at an angle of 30 ° or less. Thus, when projecting an image from an oblique direction, it is preferable to have a function (such as keystone correction) for correcting distortion and light amount of the projected image.

(4) Vibration Speaker The video display system may further include a vibration speaker 203 having a function of generating sound using a reflective screen as a vibrating body. The vibration speaker 203 includes a vibration element formed of an electromagnetic element, a piezoelectric element, or the like that converts an electric signal output from the sound output unit into vibration and vibrates the vibration body to generate sound. It is a device that uses a reflective screen as a speaker by attaching to a glass, a show window, a signboard, a panel, or the like. The electrical signal sent from the audio output unit to the vibration speaker 203 may be transmitted by wire or by a wireless device.

(5) Sound Collection Device and Phase Inverter The video display system preferably further includes a sound collection device 204 including a sound collection microphone that collects ambient sounds. The sound collected by the sound collection microphone is input to the system control unit via the voice input unit, and the phase of the collected sound is reversed by the phase inverter equipped with the function of inverting the phase of the sound included in the system control unit. By generating the reverse phase noise and outputting it from the vibration speaker 203 via the audio output unit, it is possible to cancel the surrounding sound with the reverse phase noise. In other words, by exhibiting the effect of the noise canceller, the music, voice, sound effect, etc. from the vibration speaker can be heard more clearly by the viewer. A signal input from the sound collection device 204 to the audio input unit may be transmitted by wire or may be transmitted by a wireless device.

  In this way, by canceling the surrounding sound with reverse-phase noise, music is limited to a limited area in front of the reflective screen (window glass, show window, signboard, panel, etc.) where the vibration speaker 203 is installed. A sound effect (acoustic masking) having directivity that sound, sound effects, etc. can be heard well and cannot be heard at a position outside the area can be produced.

(6) Touch sensor function The video display system may further have a touch sensor function. By having the touch sensor function, not only can the information be provided unilaterally, but also information can be selected at the user's will, and information input from the user can be performed. The touch sensor method is not particularly limited, and a known method such as a capacitance method or a resistance film method can be applied.

(7) Application example As a specific example to which the above-described video display system is applied, there is a response to a show window of an exhibit in a store or a museum. For example, a part of the show window is used as a reflective screen to display images of decorated works and product information, and by installing a vibration speaker 203 there, only people who are standing in front of the display glass case , A system that can transmit at a volume that a person speaks. Further, by adding a touch sensor function to the reflective screen, the screen is switched when the user touches a guidance display of a product or the like, and a detailed description of the product or the like can be displayed with sound.

  The present invention will be described in more detail with reference to examples, but the present invention is not limited thereto.

Example 1
40 parts by mass of triethylene glycol-bis-2-ethylbutyrate as a plasticizer with respect to 100 parts by mass of polyvinyl butyral resin (degree of butyralization: 65.9 mol%, acetyl group amount: 0.9 mol%); After adding 2 parts by mass of diamond particles (Made by Vision Development, median diameter 360 nm), kneading with a three-roll mixer at about 70 ° C. for about 15 minutes, and then using an extruder to a thickness of about 0.3 mm at 180 ° C. A resin film containing diamond particles was obtained by forming into a film and winding it on a roll. The produced resin film and a view control filter A (view angle control film VC-FILM (VC-609500) manufactured by Shin-Etsu Polymer Co., Ltd., visible angle 60 °, louver angle 0 °, maximum transmittance angle 0 °, Wa 577 μm, thickness 1.0 mm) and two glass plates, and sandwiched so as to have the configuration of glass plate 1 / diamond particle-containing resin film / field-of-view control filter A / glass plate 2 (see FIG. 2). Put it in a rubber bag and degas it for 20 minutes at a vacuum of about 2.7 kPa (20 Torr), then move it to an oven at 90 ° C. in a degassed state, and press and hold it at 90 ° C. for 30 minutes. Glass was pre-bonded. The pre-adhered laminated glass was put in an autoclave, and main adhesion was performed for 20 minutes under the conditions of a temperature of 135 ° C. and a pressure of about 120 N / cm ² (12 kgf / cm ² ) to produce a reflective screen.
The visible angle of the visual field control filter A is a range where the other side can be seen through the filter, and the difference between the angle (θ ₀ −α ₁ ) and the angle (θ ₀ + α ₂ ) described in FIG. 4, that is, (α ₁ + α _2). ). The louver angle is an inclination angle of the joint surface between the light transmission layer and the light shielding layer with respect to the normal direction of the filter, and corresponds to x in FIG. The maximum transmittance angle is θ ₀ in FIG.

Comparative Example 1
A reflective screen having a configuration of glass plate 1 / diamond particle-containing resin film / glass plate 2 was produced in the same manner as in Example 1 except that the visual field control filter A was not provided.

Comparative Example 2
A reflective screen having a configuration of glass plate 1 / resin film / field-of-view control filter A / glass plate 2 was produced in the same manner as in Example 1 except that diamond particles were not contained.

Comparative Example 3
A reflective screen having the configuration of glass plate 1 / resin film / glass plate 2 was prepared in the same manner as in Comparative Example 1 except that it did not contain diamond particles.

(Evaluation)
As shown in FIG. 16 (a), the reflective screens of Example 1 and Comparative Examples 1 to 3 are vertically arranged outside on a sunny day, and the incident angle of the projected light is obliquely above the projected image. An image was projected from the glass plate 1 side so that the upper end portion was 40 ° and the lower end portion was 70 °. In addition, the reflective screens of Example 1 and Comparative Example 2 were arranged vertically so that the joint surface between the light transmission layer and the light shielding layer of the visual field control filter A was horizontal. The image projected on the screen was observed from the same side as the projection light (projection side), and the sharpness and viewing angle of the image were evaluated. Furthermore, the transparency of the projection light was observed from the opposite side of the reflective screen with respect to the projection light.

  The sharpness of the image was evaluated visually by observing the image projected on the screen from the projection side. As a result, on the reflective screen of Comparative Example 1, the projected image was generally whitish and the outline was observed to be thin. Further, in the reflective screens of Comparative Example 2 and Comparative Example 3, the color of the projected image was hardly distinguishable, and the outline was hardly recognized. On the other hand, in the reflective screen of Example 1, the color of the projected image was very vivid and the outline was seen very clearly.

  The viewing angle was evaluated by visually observing the image projected on the screen from a direction where the viewing angle in the left-right direction was 120 ° on the projection side. The viewing angle is an angle in the left-right direction around the normal line of the screen. As a result, in the reflective screen of Comparative Example 1, the color of the projected image could hardly be distinguished, and the outline could hardly be recognized. In addition, the reflective screens of Comparative Example 2 and Comparative Example 3 could hardly recognize the projected image. On the other hand, in the reflective screen of Example 1, the color of the projected image was vivid and the outline was clearly visible. When I was not projecting images, I could see the scenery beyond the screen through the screen.

  Transparency was evaluated visually by observing the projected light through the screen from the opposite side of the reflective screen. As a result, the reflective screens of Comparative Example 1 and Comparative Example 3 were very dazzled by the direct incident light, whereas the reflective screens of Example 1 and Comparative Example 2 had a projection control filter with the projected light. Because it was completely blocked, I did not feel any glare.

Example 2
(1) Preparation of fluorinated diamond fine particles A 10 g of diamond particles (vision development, median diameter 360 nm) are placed in a nickel reaction tube, and fluorine gas is circulated at a flow rate of 15 ml / min and argon gas is circulated at a flow rate of 385 ml / min. While heating at 400 ° C. for 120 hours, fluorinated diamond fine particles A in which the surface of the diamond particles was modified with fluorine were produced. The obtained fluorinated diamond fine particle A had a median diameter of 365 nm, and the fluorine content was 12% by mass from the results of XPS and elemental analysis. The median diameter of the fluorinated diamond fine particles A was measured by the dynamic light scattering method after being dispersed in methyl ethyl ketone (MEK).

(2) Production of Reflective Screen 40 parts by mass of triethylene glycol-bis as a plasticizer with respect to 100 parts by mass of polyvinyl butyral resin (degree of butyralization: 65.9 mol%, acetyl group content: 0.9 mol%) 2-ethylbutyrate and 3 parts by mass of fluorinated diamond fine particles A were added and kneaded at about 70 ° C. for about 15 minutes with a three-roll mixer, and then at about 180 ° C. in thickness using an extruder. The resin film containing the fluorinated diamond fine particles A was obtained by forming a film of 3 mm and winding it on a roll.
The produced resin film and the view control filter B (Shin-Etsu Polymer Co., Ltd. view angle control film VC-FILM, visible angle 50 ° (α ₁ = 32.8 °, α ₂ = 17.2 °), louver angle 40 ° , Maximum transmittance angle 40 °, Wa 546 μm, thickness 1.0 mm) and two acrylic plates (acrylic plates A and B), acrylic plate A / diamond particle-containing resin film (scattering layer) / field of view The control filter B / acrylic plate B is sandwiched so as to have the configuration (see FIG. 2), put in a rubber bag, degassed at a vacuum degree of about 2.7 kPa (20 Torr) for 20 minutes, and then degassed. In this state, the film was transferred to an oven at 60 ° C., vacuum-pressed while being held at 60 ° C. for 30 minutes, and bonded to produce a reflective screen.

Example 3
Two fluorinated diamond fine particles A prepared in Example 2 were added to a methyl ethyl ketone (MEK) solution (polyvinyl butyral: 10% by mass) containing 100 parts by mass of polyvinyl butyral and 40 parts by mass of triethylene glycol-bis-2-ethylbutyrate. After adding part by mass and stirring sufficiently, the mixture was uniformly dispersed using an ultrasonic cleaner. The fluorinated diamond fine particles A were well dispersed in the MEK solution. This solution was applied to one surface of the acrylic plate by a dipping method and dried to form a scattering layer having a thickness of 200 μm. Furthermore, on the scattering layer, a hardware composed of 100 parts by weight of a polyfunctional acrylate (manufactured by Dainichi Seika Co., Ltd., EXF37), 10 parts by weight of colloidal silica (manufactured by Toshiba Silicone, UVHC-1105), and 270 parts by weight of toluene. The coating agent coating solution was applied with a bar coater, heated and dried, and then irradiated with an ultraviolet lamp at 300 MJ / cm ² to form a 5 μm thick hard coat layer. Further, a visual field control filter B was attached to the other surface of the acrylic plate (the side opposite to the side on which the scattering layer and the hard coat layer were formed) to obtain a reflective screen. This reflective screen had a configuration of hard coat layer / diamond particle-containing resin film (scattering layer) / acrylic plate / field-of-view control filter B.

Example 4
As a hard coat agent, 100 parts by weight of a polyfunctional acrylate (manufactured by Dainichi Seika Co., Ltd., EXF37), 10 parts by weight of colloidal silica (manufactured by Toshiba Silicone Co., Ltd., UVHC-1105), and fluorinated diamond fine particles A prepared in Example 2 A mixed solution with 3 parts by mass was diluted and adjusted with toluene so that the mixed solution content was 40%. The hard coat agent mixed solution was applied to one surface of the acrylic plate with a bar coater, dried by heating, and then irradiated with an ultraviolet lamp at 300 MJ / cm ² to form a hard coat layer having a thickness of 100 μm. Further, a visual field control filter B was attached to the other surface of the acrylic plate (the side opposite to the side on which the scattering layer and the hard coat layer were formed) to obtain a reflective screen. This reflective screen had a configuration of diamond particle-containing hard coat layer (scattering layer) / acrylic plate / field-of-view control filter B.

Example 5
In a 200 ml stainless steel pot, 9 parts by mass of diamond particles (Vision Development, median diameter 360 nm) and 91 parts by mass of water-based urethane resin Evaphanol HA-170 (manufactured by Nikka Chemical Co., Ltd., non-volatile components: 36.5%) are added. The mixture was stirred at 4000 rpm for 15 minutes using a homomixer (manufactured by PRIMIX, product name: TK HOMOD Disper (Model 2.5)). Then, it filtered with # 2000 * and obtained the diamond particle / urethane resin dispersion. No agglomerates were found in the cocoons.
The dispersion was applied to the surface of the acrylic plate A having a thickness of 2 mm by a bar coater method so that the solid content concentration was 50 g / m ² . Thereafter, it was placed in an oven at 105 ° C. for 30 minutes and dried to obtain a diamond particle-containing resin film having a thickness of 15 μm.
Next, using the product, the viewing angle control filter B, and another acrylic plate B having a thickness of 2 mm, the structure of acrylic plate A / diamond particle-containing resin film / viewing angle control filter B / acrylic plate B After putting it in a rubber bag and degassing it at a vacuum degree of about 2.7 KPa (20 Torr) for 20 minutes, the deaerated state is transferred to a 90 ° C oven, and at 90 ° C for 30 minutes. While being held, it was vacuum-pressed to pre-bond the laminated glass. The pre-adhered laminated glass was put into an autoclave, and main adhesion was performed for 20 minutes under the conditions of a temperature of 135 ° C. and a pressure of about 120 N / cm ² (12 kgf / cm ² ) to produce a reflective screen.

Example 6
Reflective type in the same manner as in Example 5 except that water-based acrylic resin EK-61 (manufactured by Seiden Chemical Co., Ltd., adjusted to non-volatile component = 36.5%) was used instead of Evaphanol HA-170 in Example 5. A screen was made.
This reflective screen had a configuration of acrylic plate A / diamond particle-containing resin film (scattering layer) / viewing angle control filter B / acrylic plate B.

Example 7
In a 200 ml stainless steel pot, titanium dioxide aqueous dispersion GT-10W2 (manufactured by Sakai Chemical, median diameter 90 nm, non-volatile component: 40.0%) is 21 parts by mass, aqueous acrylic resin EK-61 (chemical, non-volatile component: 42.0%) was added, and the mixture was stirred at 4000 rpm for 15 minutes using a homomixer (manufactured by PRIMIX, product name: TK HOMOD Disper (Model 2.5)). Then, it filtered with # 2000 * and obtained the diamond fine particle / urethane resin dispersion. No agglomerates were found in the cocoons.
The dispersion was applied to the surface of the acrylic plate A having a thickness of 2 mm by a bar coater method so that the solid content concentration was 50 g / m ² . Thereafter, it was placed in an oven at 105 ° C. for 30 minutes and dried to obtain a titanium dioxide particle-containing resin film having a thickness of 15 μm.
Next, using the product, the viewing angle control filter B, and another acrylic plate B having a thickness of 2 mm, the acrylic plate A / the titanium dioxide particle-containing resin film / the viewing angle control filter B / the acrylic plate B After sandwiching it into a composition and putting it in a rubber bag and degassing it at a vacuum degree of about 2.7 KPa (20 Torr) for 20 minutes, it is transferred to a 90 ° C oven in a degassed state, and 30 ° C at 30 ° C. A vacuum pressing was performed while holding for a minute to pre-bond the laminated glass. The pre-adhered laminated glass was put into an autoclave, and main adhesion was performed for 20 minutes under the conditions of a temperature of 135 ° C. and a pressure of about 120 N / cm ² (12 kgf / cm ² ) to produce a reflective screen.

Comparative Example 4
A reflective screen having the structure of acrylic plate A / diamond particle-containing resin film / acrylic plate B was produced in the same manner as in Example 2 except that the visual field control filter B was not provided.

Comparative Example 5
A reflective screen having a configuration of acrylic plate A / resin film / field-of-view control filter B / acrylic plate B was produced in the same manner as in Example 2 except that diamond particles were not contained.

(Evaluation)
As shown in FIG. 16 (b), the reflective screens of Examples 2 to 7 and Comparative Examples 4 and 5 are placed vertically on a sunny day, and the incident angle of projection light is projected from the front of the screen. The reflective screens of Examples 2, 5, 6, and 7 and Comparative Examples 4 and 5 project images from the acrylic plate A side so that the upper end portion of the image is 10 ° and the lower end portion is 10 °. The reflective screen of Example 3 projected an image from the hard coat layer side, and the reflective screen of Example 4 projected an image from the diamond particle-containing hard coat layer (scattering layer) side. In addition, the reflective screens of Examples 2 to 7 and Comparative Example 5 are arranged vertically, so that the joint surface between the light transmission layer and the light shielding layer of the visual field control filter is 40 ° (louver) from the horizontal to the front. It was arranged to tilt. The image projected on the screen from the same side (projection side) as the projection light is observed, the image sharpness and viewing angle are evaluated in the same manner as in Example 1, and the opposite of the reflective screen to the projection light. The transparency of the projection light was observed from the side.

(Image sharpness)
In the reflective screen of Comparative Example 4, since the light was incident from the side opposite to the viewing side (the side of the acrylic plate B), the projected image was generally whitish and the outline was observed thin. In the reflective screen of Comparative Example 5, the color of the projected image could hardly be distinguished, and the outline could hardly be recognized. On the other hand, in the reflective screens of Examples 2 to 7, the color of the projected image was very vivid and the outline was seen very clearly.

(Viewing angle)
In the reflective screen of Comparative Example 4, the color of the projected image could hardly be distinguished, and the outline could hardly be recognized. The reflective screen of Comparative Example 5 hardly recognized the projected image. On the other hand, in the reflective screens of Examples 2 to 7, the color of the projected image was vivid and the outline was clearly visible.

(Transparency)
The reflective screen of Comparative Example 4 was very dazzled by the direct incident light, whereas the reflective screens of Examples 2-7 and Comparative Example 5 were completely blocked by the visual field control filter. As a result, the hot spot phenomenon was eliminated.

  1 to 6, 201 ... reflective screen, 10 ... transparent substrate, 11 ... transparent sheet, 20 ... visual field control filter, 21, 22 ... louver layer, 21a, 22a ... light transmitting layer, 21b, 22b ... light shielding layer, 21c , 22c ... bonding surface, 30 ... scattering layer, 31 ... light scatterer, 40 ... hard coat layer, 101,102,103,104 ... reflective screen sheet, 202 ... projection device, 203 ... vibration speaker, 204 ... collection Sound equipment.

Claims (11)

A reflective screen for displaying an image by projected light,
A transparent substrate, a visual field control filter provided on the transparent substrate, and a scattering layer that scatters the projection light provided on the visual field control filter,
The reflection type screen, wherein the scattering layer contains a light scatterer comprising diamond particles and / or metal inorganic particles. A reflective screen for displaying an image by projected light,
A transparent substrate, a scattering layer for scattering the projection light provided on one surface of the transparent substrate, and a visual field control filter provided on the other surface of the transparent substrate,
The reflection type screen, wherein the scattering layer contains a light scatterer comprising diamond particles and / or metal inorganic particles.   3. The reflection type screen according to claim 1, wherein the visual field control filter is a louver layer in which a light transmission layer and a light shielding layer are alternately and repeatedly arranged, and a joint surface between the light transmission layer and the light shielding layer. The reflective screen is characterized by being inclined parallel or at a predetermined angle with respect to the thickness direction of the louver layer.   The reflection type screen as described in any one of Claims 1-3 WHEREIN: The said transparent substrate consists of glass or transparent polymer resin, The reflection type screen characterized by the above-mentioned.   The reflection type screen as described in any one of Claims 1-4 WHEREIN: It has a hard-coat layer on the surface, The reflection type screen characterized by the above-mentioned. A reflective screen sheet for displaying an image by projection light,
A transparent transparent sheet made of a transparent polymer resin, a visual field control filter provided on the transparent sheet, and a scattering layer for scattering the projection light provided on the visual field control filter ,
The reflective screen sheet, wherein the scattering layer contains a light scatterer comprising diamond particles and / or metal inorganic particles. A reflective screen sheet for displaying an image by projection light,
A flexible transparent sheet made of a transparent polymer resin, a scattering layer for scattering the projection light provided on one surface of the transparent sheet, and a visual field control provided on the other surface of the transparent sheet And a filter
The reflective screen sheet, wherein the scattering layer contains a light scatterer comprising diamond particles and / or metal inorganic particles.   A screen having the reflective screen according to any one of claims 1 to 5 or the sheet for a reflective screen according to claim 6 or 7, a projection device for projecting an image or a moving image on the screen, and the screen An image display system comprising: a vibration speaker having a function of generating sound by using a vibration member.   9. The video display system according to claim 8, wherein the screen has a touch sensor function.   10. The video display system according to claim 8, further comprising: a sound collecting device that collects peripheral sounds; and a phase inverter that inverts the phase of the sound.   The video display system according to any one of claims 8 to 10, further comprising a communication function.