CN110441982B

CN110441982B - Screen housing and image display system

Info

Publication number: CN110441982B
Application number: CN201910681113.5A
Authority: CN
Inventors: 弘光礼; 桂有希; 武滕宏明
Original assignee: Dai Nippon Printing Co Ltd
Current assignee: Dai Nippon Printing Co Ltd
Priority date: 2014-02-14
Filing date: 2014-10-21
Publication date: 2021-10-15
Anticipated expiration: 2034-10-21
Also published as: CN110441982A; WO2015122055A1; CN105408777A; CN105408777B; CN111352292A; CN111352292B

Abstract

The present invention relates to a screen housing and an image display system, wherein the screen housing (102) is provided with reflective screens (10, 110) and an illumination device (115) having a light emitting section (116), the light emitting section (116) of the illumination device (115) is provided so as to be capable of illuminating at least a part of a shadow (100), and the shadow (100) is generated by image light reflected at an angle substantially equal to an angle at which the image light enters the reflective screens (10, 110) from an image source.

Description

Screen housing and image display system

The invention relates to a split application, which aims at the Chinese national application number CN201480001506.2, the international application number PCT/JP2014/077964, the application date 2014 10 and 21 and the date of entering China 2014 12 and 11, and is named as a reflecting screen, a manufacturing method of the reflecting screen, a screen frame and an image display system.

Technical Field

The present invention relates to a reflection screen that reflects projected image light and displays an image, a method of manufacturing the reflection screen, a screen housing, and an image display system.

Background

Conventionally, reflective screens having various configurations have been developed and used in image display systems. In recent years, a short-focus type image projection device (projector) or the like has been widely used, which projects image light onto a reflection screen at a relatively large projection angle from a very short distance to realize a large-screen display, and in this case, a reflection screen or the like for favorably displaying the image light projected by such a short-focus type image projection device has been developed.

The short-focus image projection device can project image light onto the reflection screen from above or below at a projection angle larger than that of a conventional image source, and can shorten the distance in the depth direction between the image projection device and the reflection screen, so that the image display system using the reflection screen is advantageous in terms of space saving and the like. In order to reflect the image light more to the viewer side, the reflective screen for such an image projection apparatus is provided with a reflective layer.

In the reflective screen disclosed in JP2011-133608A, a reflective layer is formed by depositing aluminum, so that incident image light can be efficiently reflected. However, since such a reflective screen uses a vacuum deposition apparatus or the like to form the reflective layer, the process is complicated, and the manufacturing efficiency may be reduced. In addition, in order to avoid discoloration due to oxidation of the reflective layer formed by vapor deposition, such a reflective panel needs to be provided with a protective layer, and the number of steps in manufacturing the reflective panel is increased, which may disadvantageously reduce manufacturing efficiency.

In addition, as another problem, in an image display system using a short-focus type image source which projects image light from a very short distance below such a reflecting screen at a large incident angle, a part of the image light is reflected on the image source side surface of the reflecting screen and reaches the ceiling surface, and thus there is a problem that the image moves into the ceiling surface. When the image to be illuminated is a moving image, the light and shadow of the ceiling surface (see り Write み) attracts the attention of the viewer by fluctuating with the image, and the image projected on the reflecting screen cannot be focused on, which hinders comfortable viewing.

JP2013-130837a attempts to reduce the light shadow on the ceiling surface by forming a reflecting screen, which reflects the image light projected from the image source and displays the image light in a viewable manner, as a reflecting screen including: a lens layer in which a plurality of unit lenses having lens surfaces and non-lens surfaces and protruding toward a back surface side are arranged, the back surface side having a Fresnel lens shape; a reflective layer formed on at least the lens surface of the unit lens and reflecting light; and a surface layer provided on the image source side and having a fine uneven shape formed on a surface on the image source side, wherein a haze value H of the surface layer satisfies 20% to 40%.

JP2013-171114a discloses a reflective screen for reflecting image light projected from an image source and displaying the image light in an observable manner, wherein the reflective screen is formed as a reflective screen including: a lens layer in which a plurality of unit lenses having lens surfaces and non-lens surfaces and protruding toward a back surface side are arranged, the back surface side having a Fresnel lens shape; a reflective layer formed on at least the lens surface of the unit lens and reflecting light; and a surface lens layer which is disposed on the image source side of the reflection screen, has a lenticular shape, and has a plurality of unit surface lenses arranged in the left-right direction of the screen with the vertical direction of the screen of the reflection screen being the longitudinal direction, the unit surface lenses being convex toward the image source side on the surface of the image source side; the Fresnel lens has an optical center located outside the screen of the reflecting screen, and the unit surface lenses are arranged such that the width dimension of the unit surface lenses is equal to or greater than the height dimension of the lenses.

In the reflective panels described in JP2013-130837A, JP2013-171114a, it was attempted to reduce the light shadow on the ceiling surface, and it was confirmed that the results were constant. That is, the contour of the image reflected on the ceiling surface is blurred and unclear, and the luminance is also reduced. However, the light and shadow of the ceiling surface are changed and shaken with the change of the image light projected from the image source, and are observed without change. Therefore, the observer does not notice any change in the point that the light and shadow of the ceiling surface are flickering.

Disclosure of Invention

The present invention has been made in view of these circumstances, and it is a 1 st object thereof to provide a reflection screen, a method of manufacturing the reflection screen, or an image display system, which can efficiently reflect incident image light and can be easily manufactured.

It is another object of the present invention to provide a screen housing or an image display system that allows an observer to concentrate on an image reflected on a reflection screen, and that allows a comfortable view without causing a light and a shadow on a ceiling surface to catch attention.

The reflecting screen at least comprises a substrate layer and a lens layer in a laminated manner,

two or more unit lenses arranged in the lens layer, the unit lenses being convex from the base layer side toward the back surface side, the unit lenses having lens surfaces and non-lens surfaces,

a reflective layer that reflects light is provided on at least a part of the lens surface, the reflective layer having a resin and 2 or more metal flakes dispersed in the resin,

the metal sheet is disposed such that a surface perpendicular to the thickness direction thereof is substantially parallel to the lens surface.

In the reflecting screen of the present invention, the thickness T of the reflecting layer along the direction perpendicular to the lens surface in the central portion of the lens surface in the arrangement direction of the unit lenses may be in the range of 8 μm or less and T or less and 15 μm or less.

In the reflecting screen of the present invention, an average value of sizes of the metal foil in a longitudinal direction and a transverse direction orthogonal to a thickness direction of the metal foil may be 70% to 130% of a lens height size of the unit lens.

In the reflecting screen of the present invention, the reflecting layer may be formed to bury the boundary between the lens surface and the non-lens surface.

In the reflecting screen of the present invention, the thickness of the reflecting layer along the thickness direction of the lens layer at the position of the valley between the unit lenses may be 10% to 120% of the lens height of each unit lens.

In the reflective screen of the present invention, the reflective layer may further have a dark-colored material dispersed in a resin.

In the reflecting panel of the present invention, the dark color material of the reflecting layer may be composed of at least one of a flaky pigment, a fibrous pigment, and a granular pigment.

In the reflecting panel of the present invention, the dark color material of the reflecting layer may be contained in a range of 1% to 30% by weight based on the weight of the entire resin.

In the reflecting screen of the present invention, the metal foil may be laminated with 8 or more layers on average at each position on the lens surface of each of two or more unit lenses.

The screen frame body of the invention is provided with the reflecting screen and the illuminating device with the light-emitting part,

the light emitting portion of the illumination device is provided so as to be capable of illuminating at least a part of a shadow generated by image light reflected at an angle substantially equal to an angle at which the image light enters the reflection screen from the image source.

The image display system of the present invention includes the reflection screen and an image source for projecting image light onto the reflection screen.

The image display system of the present invention comprises the above-mentioned reflection screen and an illumination device having a light emitting part,

The method for manufacturing the reflecting screen comprises the following steps:

preparing a base material;

a lens layer forming step of forming a lens layer in which two or more unit lenses having lens surfaces and non-lens surfaces and protruding toward the back surface side are arranged on the back surface side of the base material; and

and a reflective layer forming step of applying a coating material containing 2 or more metal flakes to at least a part of the lens surface to form a reflective layer that reflects light.

According to the present invention, it is possible to efficiently reflect image light incident on the reflective screen and to easily manufacture the reflective screen.

Further, the screen frame of the present invention includes a reflection screen for reflecting the image light projected from the image source and displaying the image light in a viewable manner, and an illumination device having a light emitting portion,

the light emitting portion of the illumination device is provided so as to be capable of illuminating at least a part of a shadow generated by the image light reflected at an angle substantially equal to an angle at which the image light enters the reflection screen from the image source.

In the screen housing of the present invention, the light emitting portion of the illumination device may be provided so as not to directly illuminate the display surface of the reflection screen.

The image display system of the present invention comprises an image source, a reflection screen for reflecting image light projected from the image source and displaying the reflected image light in a viewable manner, and an illumination device having a light emitting portion,

the light emitting portion of the illumination device is provided so as to be capable of generating the image light reflected by the reflection screen at an angle substantially equal to an angle at which the image light enters the reflection screen from the image source.

the reflecting screen is arranged in such a manner that the ceiling surface is positioned at the upper portion thereof,

the image source is disposed at a lower position than the lower end of the reflecting screen,

the light emitting unit of the illumination device is provided so as to be capable of illuminating at least a part of a light shadow generated on the ceiling surface by the image light reflected by the reflection screen at an angle substantially equal to an angle at which the image light enters the reflection screen from the image source.

In the image display system of the present invention, the light emitting portion of the illumination device may be provided so as not to directly illuminate the display surface of the reflection screen.

In the image display system of the present invention, the light emitting portion of the illumination device is provided on the back side of the display surface of the reflection screen and is located below the upper end of the reflection screen.

In the image display system of the present invention, a light shielding portion may be provided which prevents the light emitting portion of the illumination device from directly illuminating the display surface of the reflection screen.

According to the present invention, the light and shadow on the ceiling surface do not attract attention, and the observer can concentrate on the image reflected on the reflecting screen, thereby comfortably viewing the image.

Drawings

Fig. 1 is a diagram illustrating a reflection screen and an image display system according to embodiment 1.

Fig. 2 is a longitudinal sectional view illustrating a layer structure of the reflective screen.

Fig. 3 is a diagram illustrating details of a lenticular layer and a reflective layer of a reflective screen.

Fig. 4 is an enlarged photograph showing a detailed cross section of the reflective layer formed on the lens layer.

Fig. 5 is an enlarged photograph showing a cross section of the reflective layer formed on the lens layer.

Fig. 6 is a sectional view for explaining an example of the method of manufacturing the reflecting screen according to embodiment 1.

Fig. 7 is a diagram illustrating a method for evaluating light reflection characteristics of a test piece having reflection layers with different thicknesses.

Fig. 8 is a graph showing the relationship between the thickness (film thickness) T of the reflective layer and the reflectance of the test sample.

Fig. 9 is a diagram showing details of the lens layer and the reflective layer of the reflective screen according to the modification of embodiment 1 and embodiment 2.

Fig. 10 is a side view illustrating a screen housing and an image display system according to embodiment 3.

Fig. 11 is a photograph showing the state of light and shadow on the ceiling surface in a conventional video display system and a video display system using the screen housing according to embodiment 3.

Fig. 12 is a schematic diagram illustrating an example of a lens layer of the reflective screen.

Fig. 13 is a sectional view illustrating behavior of incident light.

Fig. 14 is a perspective view illustrating a screen housing and an image display system according to embodiment 3.

Fig. 15 is a side view illustrating the screen housing and the image display system shown in fig. 14 (a).

Fig. 16 is a side view illustrating the screen housing and the image display system shown in fig. 14 (b).

Fig. 17 is a side view illustrating an application form of the screen housing and the image display system shown in fig. 14 (b).

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings and the like. The drawings shown below, including fig. 1, are schematically illustrated, and the size and shape of each part are exaggerated as appropriate for easy understanding. In addition, the terms such as plate and sheet are used, and as a general method of use, these plates, sheets and films are used in order of thickness, and the present specification is also used in accordance with this method. However, such distinction is used without technical meaning, and these are used as appropriate alternatives. The numerical values such as dimensions and material names of the respective members described in the present specification are examples of the embodiment, and are not limited thereto, and can be appropriately selected and used.

In the present specification, terms such as "parallel", "orthogonal" and "identical" for specifying the shape, the geometrical condition and the degree thereof, and the value of the length or the angle are not limited to strict meanings, and may be interpreted to include ranges of degrees that can expect the same function. In the present specification, the sheet surface (plate surface, film surface) means a surface in the plane direction of the sheet (plate, film) when viewed as the sheet (plate, film) as a whole in each sheet (plate, film).

(embodiment 1)

Fig. 1 is a diagram illustrating a video display system 1 according to the present embodiment. Fig. 1(a) is a perspective view of an image display system 1 including a reflection screen 10, and fig. 1(b) is a side view of the image display system 1 including the reflection screen 10. The image display system 1 includes a reflection screen unit 5 having a reflection screen 10 and an image source LS. In the video display system 1 of the present embodiment, the reflection screen 10 reflects the video light L projected from the video source LS to display a video on the screen. The image display system 1 can be used, for example, as a front projection television system or the like that projects image light L from an image source LS.

The image source LS is an image light projection device that projects image light L onto the reflection screen 10. As the image source LS, for example, a general-purpose short focal length type projector can be used. When the screen of the reflection screen 10 is viewed from the normal direction (normal direction of the screen surface) in the use state, the image source LS is disposed at the center in the screen left-right direction of the reflection screen 10 and below the screen (display area) of the reflection screen 10. The screen surface is a surface that is in the plane direction of the reflecting screen 10 when viewed as the whole reflecting screen 10. The image source LS can project the image light L from a position far closer to the reflecting screen 10 than a conventional general-purpose projector in a direction perpendicular to the screen surface of the reflecting screen 10 (thickness direction of the reflecting screen 10). That is, compared to a conventional general-purpose projector, the projection distance from the image source LS to the reflective screen 10 is short, and the incident angle of the image light L with respect to the screen surface of the reflective screen 10 is also large.

The reflective screen 10 reflects the image light L projected from the image source LS toward the viewer O to display an image. In the example shown in fig. 1, the observation screen of the reflection screen 10 is an approximate rectangle whose longitudinal direction is the screen left-right direction when viewed from the observer O side. In the following description, unless otherwise specified, the vertical direction of the screen, the horizontal direction of the screen, and the thickness direction are the vertical direction (vertical direction), the horizontal direction (horizontal direction), and the thickness direction (depth direction) of the screen in the use state of the reflection screen 10. The reflective screen 10 has a large screen (display area) with a diagonal of 100 inches or 120 inches, for example.

In the example shown in fig. 1, the video display system 1 includes the video source LS as a short focal length type projector and the reflecting screen 10 that reflects the video light projected from the video source LS and displays a video, but is not limited to this, and the video source LS may be a conventional general-purpose projector having a long projection distance and a small projection angle of the video light (i.e., an incident angle of the video light to the screen), and the reflecting screen 10 may be associated with the video source LS.

Fig. 2 is a longitudinal sectional view illustrating a layer structure of the reflective screen 10 of the present embodiment. In fig. 2, a part of a cross section passing through a point a (see fig. 1 a and b) which is a geometric center (screen center) of an observation screen (display region) of the reflection screen 10, which is parallel to the screen vertical direction and perpendicular to the screen surface (parallel to the thickness direction) is enlarged and displayed. As shown in fig. 1, the reflection screen unit 5 includes a reflection screen 10, a flat plate-like support plate 60 disposed on the back surface side thereof, and a bonding layer 70. The reflective screen 10 and the support plate 60 are bonded together by a bonding layer 70.

The material and the like of the support plate 60 are not particularly limited as long as they are members having high rigidity, and for example, a metal plate such as aluminum or a resin plate such as acrylic resin is preferably used. Further, a metal plate material, a so-called honeycomb plate, or the like may be used, and the front and back surfaces thereof are made of a thin plate such as aluminum, and the core material inside thereof is formed into a honeycomb structure by a thin plate such as aluminum, thereby achieving a reduction in weight of the entire plate material. In addition, the support plate 60 is preferably a member having no light-transmitting property from the viewpoint of preventing the shading by external light, the contrast reduction by external light, or the like. The thickness of the support plate 60 is preferably 0.2mm to 5.0mm, more preferably 1.0mm to 3.0 mm. If the thickness is thinner than 0.2mm, rigidity sufficient to support planarity is not provided; if the thickness is more than 5.0mm, there is a problem that the weight of the support plate 60 becomes heavy. In many cases, the reflecting screen 10 is thin, and if it is present alone, it does not have rigidity enough to maintain planarity. Therefore, the reflecting screen 10 maintains the planarity of its screen by forming a shape to be engaged with the supporting plate 60.

The bonding layer 70 is a layer having a function of bonding the reflective screen 10 and the support plate 60. The junction layer 70 may be formed using an adhesive, or the like.

As shown in fig. 2, the reflection screen 10 includes a surface layer 50, a base material layer 40, a lens layer 30, and a reflection layer 20 in this order from the image source LS side (the observer O side) in the thickness direction. The base layer 40 is a sheet-like member that becomes a base material when the lens layer 30 is formed. A surface layer 50 is laminated on the image source LS side of the base material layer 40, and a lens layer 30 is laminated on the back surface side (back surface side) which is the opposite side of the base material layer 40 from the image source LS side.

The base layer 40 has a light diffusion layer 41 containing a diffusion material, and a colored layer 42 containing a coloring material such as a pigment or a dye. The base layer 40 of the present embodiment is formed by integrally laminating the light diffusion layer 41 and the colored layer 42 by coextrusion molding. In the present embodiment, the example shown in fig. 2 is shown, and the light diffusion layer 41 is positioned on the back side and the colored layer 42 is positioned on the image source LS side in the base layer 40, but the present invention is not limited thereto, and a form may be adopted in which the light diffusion layer 41 is positioned on the image source LS side and the colored layer 42 is positioned on the back side.

The light diffusion layer 41 is a layer made of a light-transmitting resin as a base material and containing a light-diffusing material. The light diffusion layer 41 has a function of increasing the angle of view or improving the in-plane uniformity of luminance. As the resin of the base material of the light diffusion layer 41, for example, a PET (polyethylene terephthalate) resin, a PC (polycarbonate) resin, an MS (methyl methacrylate styrene) resin, an MBS (methyl methacrylate butadiene styrene) resin, a TAC (trivinyl cellulose) resin, a PEN (polyethylene naphthalate) resin, an acrylic resin, or the like is preferably used.

As the diffusion material included in the light diffusion layer 41, an organic diffusion material including particles made of a resin such as an acrylic resin, an epoxy resin, or a silicone resin, an inorganic diffusion material including inorganic particles, or the like is preferably used. The diffusion material may be an inorganic diffusion material or an organic diffusion material. The diffusion material is preferably a material that is approximately spherical and has an average particle diameter of about 1 μm to 50 μm. The range of the particle diameter of the diffusion material suitably used is preferably 5 μm to 30 μm. The thickness of the light diffusion layer 41 also depends on the screen size of the reflective screen 10, etc., but is preferably about 100 μm to 2000 μm. The light diffusion layer 41 preferably has a haze value in the range of 85% to 99%.

The colored layer 42 is a layer colored with a dark-colored colorant such as black in order to achieve a specific light transmittance. The colored layer 42 has a function of absorbing unnecessary external light such as illumination light incident on the reflective screen 10, reducing the black luminance of a displayed image, and improving the contrast of the image. As the coloring agent of the colored layer 42, dark color dyes, pigments, and the like such as gray-based or black-based; and metal salts such as carbon black, graphite, and black iron oxide. As the resin of the base material of the colored layer 42, PET resin, PC resin, MS resin, MBS resin, TAC resin, PEN resin, acrylic resin, or the like can be used. The colored layer 42 is preferably made to have a thickness of about 30 to 1000 μm depending on the screen size of the reflective screen 10 and the like.

Fig. 3 is a diagram illustrating details of the lens layer 30 and the reflective layer 20 according to the present embodiment. Fig. 3(a) shows the case where the lens layer 30 is viewed from the back-face side front direction, and the reflection layer 20 is omitted from the illustration for ease of understanding. Fig. 3(b) shows a part of the cross section shown in fig. 2 in a further enlarged scale. Fig. 3(c) shows an enlarged perspective view of the lens layer formed with the reflective layer. For easy understanding, the base material layer 40 and the surface layer 50 on the image source LS side of the lens layer 30 are omitted in fig. 3(b) and 3 (c).

The lens layer 30 is a light-transmitting layer provided on the back surface side of the base layer 40, and as shown in fig. 3(a) and the like, has a circular fresnel lens shape on the back surface side thereof, and a plurality of unit lenses 31 are concentrically arranged around a point C. With this circular fresnel lens shape, a point C as its optical center (fresnel center) is outside the area of the screen (display area) of the reflection screen 10 and below the reflection screen 10. In the present embodiment, the lens layer 30 is described by taking an example in which the surface on the back side thereof has a circular fresnel lens shape, but the present invention is not limited thereto, and may be in a form having a linear fresnel lens shape in which the unit lenses 31 are arranged in the vertical direction of the screen or the like along the screen surface.

As shown in fig. 2 and 3 b, the sectional shape of the unit lens 31 in the cross section parallel to the direction perpendicular to the screen surface (the thickness direction of the reflective screen 10) and parallel to the arrangement direction of the unit lenses 31 is substantially triangular. The unit lens 31 is convex toward the rear surface side, and includes a lens surface 32 and a non-lens surface 33, and the non-lens surface 33 faces the lens surface 32 in a direction parallel to the screen surface and orthogonal to the extending direction of the unit lens 31, that is, faces the lens surface 32 in the screen vertical direction of fig. 3 (b). In the present embodiment, in the use state of the reflection screen 10, the lens surface 32 is positioned above the non-lens surface 33 in the vertical direction with respect to the unit lens 31 with the vertex t therebetween.

As shown in fig. 3(b), the angle formed by the lens surface 32 of the unit lens 31 and the plane parallel to the screen surface is α. An angle formed by the non-lens surface 33 and a plane parallel to the screen surface is β (β > α). The arrangement pitch of the unit lenses 31 is P, and the lens height of the unit lenses 31 (the size of a point v that becomes a bottom between a vertex t and the unit lenses 31 in the thickness direction of the screen) is h. For ease of understanding, in fig. 2 and the like, the arrangement pitch P, the angles α, β of the unit lenses 31 are shown in a fixed manner in the arrangement direction of the unit lenses 31. However, although the unit lenses 31 of the present embodiment are actually fixed in the arrangement pitch P and the like, the angle α gradually increases as the distance from the point C, which is the fresnel center, in the arrangement direction of the unit lenses 31 increases. In addition, the lens height h also changes along with this. In the unit lens 31 of the present embodiment, the arrangement pitch P is formed in the range of 50 μm to 200 μm, the lens height h is formed in the range of 0.5 μm to 60 μm, the angle α of the lens surface 32 is formed in the range of 0.5 ° to 35 °, and the angle β of the non-lens surface 33 is formed in the range of 45 ° to 90 °. The arrangement pitch P may be a form that gradually changes along the arrangement direction of the unit lenses 31, and may be appropriately changed according to the size of the pixels (pixels) of the image source LS that project the image light L, the projection angle of the image source LS (the incident angle of the image light on the screen surface of the reflecting screen 10), the screen size of the reflecting screen 10, the refractive index of each layer, and the like.

The lens layer 30 is laminated on the surface on the back side of the base layer 40 (the surface on the light diffusion layer 41 side in the present embodiment) by an ultraviolet curable resin such as urethane acrylate or epoxy acrylate. The lens layer 30 may be formed of another ionizing radiation curing resin such as an electron beam curing resin. The lens layer 30 may be formed of a thermoplastic resin by a press molding method or the like according to the fresnel lens shape of the lens layer 30. In the case of such a lens layer 30, a substrate layer 40 (light diffusion layer 41) and the like may be laminated on the image source side thereof by a bonding layer and the like (not shown). When the extrusion molding method is available, the lens layer 30 and the base material layer 40 may be integrally laminated and molded.

Fig. 4 is an enlarged photograph showing a detailed cross section of the reflection layer formed on the lens layer of the present embodiment. Fig. 5 is an enlarged photograph showing a cross section of the reflective layer formed on the lens layer of the present embodiment. The reflective layer 20 is a layer having a function of reflecting light. The reflective layer 20 has a thickness sufficient to reflect light, and is formed on at least a part of the lens surface 32 of the unit lens 31. As shown in fig. 2 or 3(b), the reflective layer 20 of the present embodiment is formed on the lens surface 32 and the non-lens surface 33. Specifically, the reflective layer 20 is formed so as to cover the rear surface side of the lens layer 30 and fill the boundaries (i.e., the points v at the bottom of the valleys) between the unit lenses 31 protruding toward the rear surface side. Thus, the reflective layer 20 can make the irregularities on the back surface side of the lens layer substantially flat, and the support plate 60 can be more stably attached by the bonding layer 70.

Fig. 4 is a sectional view of a position 1100mm from a point C as a fresnel center, and in the reflection layer 20 shown in the figure, the reflection layer 20 is formed to have a thickness of 24 μm in the thickness direction of the lens layer 30 at a point v which is a bottom of a valley between the unit lenses 31 with respect to a lens height h of the unit lenses 31 of 20 μm. That is, in the reflective layer 20, the thickness of the reflective layer 20 in the thickness direction of the lens layer 30 at the point v that becomes the bottom of the valley between the unit lenses 31 is 120% of the lens height h of the unit lenses 31. Therefore, the support plate 60 can be stably attached to the back surface side of the reflective layer 20. Here, as described above, the lens height h of the unit lenses 31 varies as it is distant from the point C as the fresnel center in the arrangement direction of the unit lenses 31, but in order to more effectively achieve the above-described effects, the thickness of the reflective layer 20 in the thickness direction of the lens layer 30 at the point v which becomes the bottom of the valley between the unit lenses 31 is preferably formed to have a size in the range of 10% to 120% with respect to the lens height h of each unit lens 31.

The reflective layer 20 is formed by, for example, spray-coating a coating material (resin) containing a scaly metal thin film (metal foil) 25 having high light reflectivity such as aluminum on the lens surface 32. As shown in fig. 4 and 5, in the reflective layer 20, the surface perpendicular to the thickness direction of the scaly metal thin film 25 is disposed substantially parallel to the lens surface 32, and the image light L incident on the lens surface 32 can be appropriately reflected toward the observer O side. Here, the substantially parallel state includes not only a case where the surface perpendicular to the thickness direction of the metal thin film 25 is completely parallel to the lens surface 32 but also a case where the inclination with respect to the lens surface 32 is in the range of-10 ° to +10 °. The scale-like thin metal film 25 means that the shape (outer shape) as viewed from the thickness direction of the thin metal film 25 is a scale-like shape, and the scale-like shape includes not only a scale-like shape but also an oval shape, a circular shape, a polygonal shape, an irregular shape obtained by crushing a thin film, and the like. The properties of the scale-like metal thin film, that is, the metal flake are classified into a floating type, a non-floating type, a resin coating type, and the like, and the metal flake is characterized by metallic luster, hiding property, adhesion, orientation, and the like.

In order to prevent the rear surface side of the reflective layer 20 from being transparent while maintaining and improving the reflection efficiency of the image light, the metal thin film (metal sheet) 25 is preferably formed by stacking 8 or more layers on each position on the lens surface of each of the plurality of unit lenses. The reflective layer 20 provided with 8 or more layers of the metal thin film 25 may be provided on a part of the lens surfaces 32 of 2 or more unit lenses 31, or may be provided on all the lens surfaces 32. Here, since the reflection layer 20 shown in fig. 4 and 5 has the regular reflectance Rt of 57.8% and the diffuse reflectance Rd of 43.9%, it can efficiently reflect incident image light to the viewer side. In order to efficiently reflect incident image light, the reflection layer 20 preferably has a regular reflectance Rt of 50% < Rt < 70% and a diffuse reflectance Rd of 10% < Rd < 50%.

The coating material forming the reflective layer 20 is composed of a scale-like metal thin film (metal foil) 25, a binder, a drying aid, a control agent, and the like. The viscosity of the coating material is preferably in the range of 50 to 1000[ cp ] (measurement temperature 23 ℃) from the viewpoint of ease of application by a spray gun. The metal thin film 25 is aluminum formed in a scale shape, and the thickness dimension thereof is formed in a range of 15nm to 150nm, more preferably in a range of 20nm to 80 nm. The average value of the vertical and horizontal dimensions (hereinafter referred to as vertical and horizontal dimensions) of the metal thin film 25 perpendicular to the thickness direction is preferably set to a dimension equivalent to the lens height h of the unit lens 31, that is, 0.35 μm to 78 μm. Here, the term "equivalent to the lens height h" includes not only the case where the vertical and horizontal dimensions of the metal thin film are equal to the lens height h, but also the case where the metal thin film is similar to the lens height h (for example, a dimensional range of-30% to + 30% with respect to the lens height h).

Here, if the metal thin film 25 is disposed substantially parallel to the non-lens surface 33, when external light enters the non-lens surface 33, the external light may be reflected by the non-lens surface 33 and reach the observer O side, which may cause a decrease in the contrast of an image. Therefore, by making the vertical and horizontal dimensions of the metal thin film 25 equal to the lens height h as described above, when the coating material is applied to the back surface side of the lens layer 30, the metal thin film 25 can be prevented from being disposed substantially parallel to the non-lens surface 33. Accordingly, even when external light enters the non-lens surface 33, the reflection layer 20 can diffuse at the end of the metal thin film, and can be suppressed as much as possible from being reflected toward the observer O side. From the viewpoint of securing the light reflection function as the reflection layer, the metal thin film 25 is preferably contained in an amount of 3 to 15% by weight based on the weight of the entire coating material.

The binder is, for example, a transparent adhesive agent made of thermosetting resin, which is a base material for forming the reflective layer 20. In the present embodiment, a urethane-based thermosetting resin is used as the binder, but the present invention is not limited thereto, and an epoxy-based thermosetting resin, an ultraviolet-curable resin, or the like may be used. The adhesive may be used as a two-pack curing type by adding a curing agent, and may be used as a urethane resin, a polyisocyanate, or the like, or as an epoxy resin, an amine.

The drying auxiliary agent is a solvent for adjusting the drying time of the coating material applied to the lens layer to a specific time, that is, a so-called slow drying solvent. In the present embodiment, a specific amount of the drying assistant is contained in the paint, and the time until the paint applied to the back surface side of the lens layer 30 is dried is about 1 hour. As the drying assistant, for example, a mixed solvent of propylene glycol monomethyl ether acetate, ethylene glycol monobutyl ether, diisobutyl ketone, and 3-methoxy-1-butyl acetate can be used.

The control agent is a solvent for controlling the orientation of the metal thin film 25 contained in the dope. By including the control agent in the paint, the metal thin film 25 can be disposed substantially parallel to the lens surface 32. The control agent may be, for example, silica, alumina, aluminum hydroxide, acrylic oligomer, silicone, or the like.

In the reflection layer 20, from the viewpoint of ensuring the light reflection characteristics thereof well and from the viewpoint of maintaining the appearance of the rear surface side of the reflection screen 10 well, as shown in fig. 5, the thickness T (film thickness) of the reflection layer along the direction perpendicular to the lens surface 32 at the position on the central portion Q of the lens surface 32 in the arrangement direction of the unit lenses 31 is preferably in the range of 8 μm or less and T or less and 15 μm or less. If the thickness T of the reflective layer 20 is less than 8 μm, the reflectance of the reflective layer 20 is reduced, and the image light L may not be sufficiently reflected, and the reflective layer 20 on the rear surface side of the reflective screen 10 may have a coated portion and a non-coated portion, which may cause unevenness, scratches, and the like in appearance, and may impair the appearance of the rear surface side of the reflective screen 10. In addition, when the thickness T of the reflective layer 20 is larger than 15 μm, a part of the metal thin film 25 included in the reflective layer 20 is not aligned substantially parallel to the lens surface, but is aligned substantially perpendicular to the lens surface, and the appearance of the rear surface side of the reflective layer 20 is uneven, which may impair the appearance of the rear surface side of the reflective screen 10.

The surface layer 50 is a layer laminated on the image source LS side (viewer O side) of the base material layer 40. The surface layer 50 of the present embodiment forms the outermost surface of the reflective screen 10 on the image source LS side. The surface layer 50 of the present embodiment has a hard coat function and an antiglare function, and is formed by applying an ionizing radiation-curable resin such as an ultraviolet-curable resin (for example, urethane acrylate) having a hard coat function to the surface of the substrate layer 40 on the image source LS side so that the film thickness of the coating film is about 10 to 100 μm, transferring a fine uneven shape (rough shape) to the surface of the resin film, and curing the resin film to impart the surface with a fine uneven shape.

The surface layer 50 is not limited to the above example, and may be provided by appropriately selecting one or more necessary functions from among an antireflection function, an antiglare function, a hard coat function, an ultraviolet absorption function, an antifouling function, an antistatic function, and the like. In addition, a touch panel layer or the like may be provided as the surface layer 50. The surface layer 50 may further include a layer having an antireflection function, an ultraviolet absorption function, an antifouling function, an antistatic function, or the like between the surface layer 50 and the base layer 40. The surface layer 50 may be bonded to the base material layer 40 with an adhesive material (not shown) different from the base material layer 40, or may be formed directly on the surface of the base material layer 40 opposite to the lens layer 30 (on the image source LS side).

Returning to fig. 2, the case of the image light L1 and the external lights G1 and G2 incident on the reflection screen 10 of the present embodiment will be described. In fig. 2, the refractive indices of the surface layer 50, the colored layer 42, the light diffusion layer 41, and the lens layer 30 are made equal for easy understanding, and the light diffusion function of the light diffusion layer 41 with respect to the image light L1 and the external lights G1 and G2, and the like are omitted from illustration. As shown in fig. 2, most of the image light L1 projected from the image source LS enters from below the reflection screen 10, passes through the surface layer 50 and the base material layer 40, and enters the unit lenses 31 of the lens layer 30.

The image light L1 enters the lens surface 32, is reflected by the reflection layer 20, and is emitted from the reflection screen 10 in a substantially front direction toward the viewer O. Therefore, the image light L1 is efficiently reflected and reaches the observer O, and thus a bright image can be displayed. Since the image light L1 is projected from below the reflection screen 10 and the angle β (see fig. 3 b) is larger than the incident angle of the image light L1 at each point in the vertical direction of the screen of the reflection screen 10, the image light L1 does not directly enter the non-lens surface 33, and the non-lens surface 33 does not affect the reflection of the image light L1.

On the other hand, as shown in fig. 2, unnecessary external light G1, G2 such as illumination light enters mainly from above the reflection screen 10, passes through the surface layer 50 and the base material layer 40, and enters the unit lenses 31 of the lens layer 30. Further, although a part of the external light G1 enters the non-lens surface 33, the light is diffused at the end of the metal thin film 25 of the reflection layer 20 formed on the rear surface side of the non-lens surface 33, and the amount of the light is greatly reduced from the image light L1 even when the light reaches the observer O side. Since a part of the external light G2 is reflected by the lens surface 32 and mainly directed to the lower side of the reflection screen 10, it does not directly reach the observer O side, and even when it reaches the observer O side, the amount of the external light G2 is greatly reduced from the image light L1. Further, a part of the external light enters the reflective screen 10 and is absorbed by the colored layer 42. Therefore, in the reflective screen 10, the contrast of the image can be suppressed from being lowered by the external light G1, G2, or the like.

As described above, the reflective panel 10 of the present embodiment can display a bright and favorable image with high contrast even in a bright room environment.

Next, an example of a method for manufacturing the reflection screen 10 of the present embodiment will be described.

Fig. 6 is a sectional view for explaining an example of the method of manufacturing the reflecting screen 10 according to the present embodiment. As shown in fig. 6(a), the light diffusion layer 41 and the colored layer 42 are integrally molded by co-extrusion molding of a resin containing a diffusion material and a resin containing a coloring material at a predetermined thickness, respectively, to form the base layer 40. Here, the base material layer 40 is assumed to be a mesh.

Next, as shown in fig. 6(b), an ultraviolet curable resin such as urethane acrylate is applied to the surface of the substrate layer 40 on the image source LS side (the surface on the colored layer 42 side in the present embodiment), and the fine uneven shape (rough shape) is transferred to the surface of the resin film and cured to form a surface layer 50 having a fine uneven shape on the surface. In the present embodiment, the surface layer 50 is formed so that the surface roughness of the surface is in the range of 0.1 to 3 μm and the haze value is in the range of 5 to 20%. Note that a shielding material, not shown, may be bonded to the surface layer 50 so as to be peelable, and then the process may be shifted to the next step. As the shielding material, for example, a transparent or slightly transparent sheet member having a function of preventing the surface of the surface layer 50 from being contaminated or damaged in the subsequent manufacturing process can be used.

Next, the surface layer 50 and the base material layer 40 are cut into a specific size and formed into a single sheet. As shown in fig. 6 c, the lens layer 30 is formed on the surface on the back side of the base layer 40 (the surface on the light diffusion layer 41 side in the present embodiment) by an ultraviolet molding method or the like (lens layer forming step). The lens layer 30 is formed by: the lens layer 30 is formed by pressing the surface of the base layer 40 opposite to the surface on which the surface layer 50 is laminated (the surface on the light diffusion layer 41 side in the present embodiment) into a molding die filled with an acrylic ultraviolet-curable resin and capable of forming a circular fresnel lens shape, curing the resin by irradiation with ultraviolet rays, and then releasing the molding die from the molding die. The method of forming the lens layer 30 may be appropriately selected, but is not limited thereto.

Next, as shown in fig. 6 d, a paint (resin) containing a scaly metal thin film (metal foil) 25 is sprayed on the back surface side of the lens layer 30 by a not-shown spray gun to form the reflective layer 20. The coating of the coating material is carried out by: the coating is performed by moving the spray gun from the lower end portion to the upper end side in the vertical direction of the screen at a predetermined movement pitch (for example, a pitch of 70 mm) while moving the spray gun in parallel in the horizontal direction of the screen of the lens layer 30 (reflective layer forming step). In this case, the orientation of the spray gun is preferably substantially perpendicular to the lens surface 32 in order to facilitate the arrangement of the metal thin film 25 substantially parallel to the lens surface 32.

Subsequently, the screen material or the like is peeled off from the surface layer 50, or a post-process such as a cutting process or the like is further performed, thereby completing the reflection screen 10.

In the above description, the reflective layer forming step shows an example in which the reflective layer 20 is formed by applying the paint containing the scale-like metal thin film 25 by a spray gun, but is not limited thereto. For example, the reflective layer 20 may be formed by a so-called roll coating method: that is, the coating is performed by pressing a rotating roller coated with the coating material against the object to be coated (lens layer).

Here, the reflection layer of the lens layer which has been mainly provided in the manufactured reflection panel (hereinafter referred to as a reflection panel of a comparative example) has been conventionally formed by a vacuum deposition method in which a metal such as aluminum is deposited. The reflective layer formed by this vapor deposition can efficiently reflect image light and has a very thin thickness (e.g., about

) Therefore, in order to prevent the rear surface side of the reflective screen from being transparent or to suppress oxidation of the reflective layer, it is necessary to provide a protective layer on the rear surface side of the reflective layer. Therefore, the reflecting panel of the comparative example needs to be provided with a process step of vapor deposition and a process step of forming a protective layer in forming the reflective layer.

In contrast, in the reflection screen 10 of the present embodiment, since the plurality of scale-like metal thin films (metal flakes) 25 contained in the coating material are arranged substantially parallel to the lens surface 32, the reflection screen 10 can be manufactured more efficiently and more easily than the reflection screen of the comparative example manufactured by the vacuum deposition method. That is, although the reflecting layer of the reflecting panel of the above comparative example requires a lot of time and complicated work to form the lens layer by disposing the lens layer in a vacuum atmosphere using a vacuum deposition apparatus or the like and then depositing a deposition metal, the reflecting layer 20 of the reflecting panel 10 of the present embodiment is coated with a paint containing the metal thin film 25, and therefore, the time taken to form the lens layer can be further shortened and the necessary work can be made simpler. Further, since the reflection screen 10 of the present embodiment is formed so that the reflection layer 20 covers the back surface side of the unit lens 31, it is not necessary to provide a protective layer as in the reflection screen of the comparative example, and in this regard, the reflection screen can be manufactured more easily than the reflection screen of the comparative example. In addition, the manufacturing cost of the reflective screen 10 can be reduced.

In the reflecting panel of the comparative example, the entire reflecting panel has a yellowish color tone because the reflecting layer is formed by vapor deposition, but the entire reflecting panel 10 of the present embodiment has a bluish color tone because the reflecting layer 20 is formed by a plurality of scale-like metal thin films (metal flakes) 25. Here, when adjusting the color tone of the image light L projected from the image source LS and adjusting the color tone of the image displayed on the reflection screen, it becomes easier to correct the image to white color when the reflection screen is bluish than when the reflection screen is yellowish. Therefore, the reflection screen 10 of the present embodiment can easily perform the color tone correction by the adjustment of the image source LS, as compared with the reflection screen of the comparative example.

Next, the change in the light reflection characteristics of the reflective layer when the thickness T of the reflective layer was changed was evaluated.

Fig. 7 is a diagram illustrating a method for evaluating light reflection characteristics of a test piece having reflection layers with different thicknesses. The reflection characteristics of the reflective layer were evaluated as follows: a plurality of test pieces 80 having reflective layers with different thicknesses T were prepared, and the absolute reflectance of each test piece was measured and evaluated. As shown in fig. 7, the test piece 80 had a reflective layer 82 formed on a substrate 81 by spray coating. The substrate 81 is a transparent resin plate made of polycarbonate having an outer shape of 50mm × 50mm and a thickness of 1mm, and is a member simulating the lens layer 30 of the reflection screen.

The reflective layer 82 is a layer having light reflection characteristics formed on the surface of the substrate 81. The reflective layer 82 is formed by applying a paint containing a scaly metal thin film (metal foil) similar to the reflective layer to the surface of the substrate 81 by spraying, in a manner similar to the reflective layer 20 of the reflective panel 10. The thickness T of the reflective layer 82 of the test piece 80 represents an average value of the maximum value and the minimum value of the thickness of the reflective layer 82 in the direction perpendicular to the surface of the base 81. In this evaluation test, the thickness T of the reflective layer 82 of each test piece 80 was 8.0 μm, 8.7 μm, 9.0 μm, 9.8 μm, and 10.2 μm, respectively. The reflectance was measured by using a reflectance measuring instrument (HR-100, manufactured by color engineering research, Kyowa K.K.) to measure the total reflectance.

Fig. 8 is a graph showing the relationship between the thickness T and the reflectance of the reflective layer 82 of the test body. The vertical axis of fig. 8 represents the reflectance [% ] of the reflective layer 82, and the horizontal axis represents the thickness T [ μm ] of the reflective layer 82. Here, the measured reflectance is total ray reflectance (Rt), which represents a ratio of a total reflected light beam to a parallel incident light beam of the test piece. As shown in fig. 8, when the thickness T of the reflective layer 82 is 8 μm or more, the reflectance of the reflective layer 82 is 54% or more, and it is confirmed that the reflective layer has a good light reflection characteristic.

As described above, the reflective screen according to the present embodiment can exhibit the following effects.

As shown in fig. 2, the reflection screen 10 is arranged so that the surface perpendicular to the thickness direction of the plurality of scale-like metal thin films (metal thin sheets) 25 included in the resin forming the reflection layer 20 is substantially parallel to the lens surface 32, and therefore the image light L, L1 can be appropriately reflected toward the observer O side. On the other hand, unnecessary external light G1, G2 such as illumination light enters mainly from above the reflection screen 10, passes through the surface layer 50 and the base material layer 40, and enters the unit lenses 31 of the lens layer 30. Further, although a part of the external light G1 enters the non-lens surface 33, the light is diffused at the end of the metal thin film 25 of the reflection layer 20 formed on the rear surface side of the non-lens surface 33, and the amount of the light is greatly reduced from the image light L1 even when the light reaches the observer O side. Since a part of the external light G2 is reflected by the lens surface 32 and mainly directed to the lower side of the reflection screen 10, it does not directly reach the observer O side, and even when it reaches the observer O side, the amount of the external light G2 is greatly reduced from the image light L1. Further, a part of the external light enters the reflective screen 10 and is absorbed by the colored layer 42. Therefore, in the reflective screen 10, the contrast of the image can be suppressed from being lowered by the external light G1, G2, or the like. Further, since the reflective layer 20 is formed by applying a resin (paint) containing the metal thin film 25, the reflective screen 10 can be manufactured more efficiently and more easily than the reflective screen of the above-described comparative example manufactured using a vacuum deposition apparatus or the like.

In the reflecting screen 10, the reflecting layer 20 is formed of a paint containing a plurality of scale-like metal thin films 25, and the thickness T in the direction perpendicular to the lens surfaces 32 is in the range of 8 [ mu ] m or less and 15 [ mu ] m or less at the central portion Q of the lens surfaces 32 in the arrangement direction of the unit lenses 31. This allows the reflective screen 10 to easily manufacture the reflective layer 20 and to ensure good light reflection characteristics of the reflective layer 20. Further, formation of unevenness or scratches on the rear surface side of the reflective layer 20 can be suppressed, and the appearance of the rear surface side of the reflective screen 10 can be improved.

In the reflection screen 10, since the vertical and horizontal dimensions of the metal thin film 25 of the reflection layer 20 are equal to the dimensions of the lens height dimension h of the unit lens 31, the image light L incident on the lens surface 32 can be appropriately reflected to the observer O side, and when the coating material is applied to the rear surface side of the lens layer 30, the metal thin film 25 can be prevented from being disposed substantially parallel to the non-lens surface 33.

Since the reflective sheet 10 is formed such that the reflective layer 20 covers the rear surface side of the unit lens 31, it is not necessary to provide a protective layer as in the reflective sheet of the comparative example, and the reflective sheet can be manufactured more easily than the reflective sheet of the comparative example requiring a protective layer. In addition, the manufacturing cost of the reflective screen 10 can be reduced.

In the reflective screen 10, since the metal thin film 25 of the reflective layer 20 is laminated on the lens surface 32 in 8 or more layers, the rear surface side of the reflective layer 20 can be prevented from being transparent while maintaining and improving the reflection efficiency of the image light L.

(embodiment 2)

Next, embodiment 2 of the present invention will be explained. In the following description, the same reference numerals are attached to the same parts as those of the embodiment 1 or the same reference numerals are attached to the ends of the parts that exhibit the same functions as those of the embodiment, with overlapping descriptions being omitted as appropriate.

The reflection screen of embodiment 2 is different from embodiment 1 in that the reflection screen of embodiment 1 has the same layer structure, but the coating material forming the reflection layer further contains a dark color material.

The coating material for forming the reflective layer 20 is composed of a scale-like metal thin film (metal foil) 25, a binder, a drying auxiliary agent, a control agent, a dark color material, and the like. The scale-like metal thin film 25, binder, drying assistant and control agent constituting the coating material are the same as those in embodiment 1.

The dark color material contained in the coating material forming the reflective layer 20 is, for example, a pigment for coloring the base material (binder) forming the reflective layer 20 to a dark color (gray, black, or the like), and examples thereof include carbon black (carbon particles), fibrous carbon, and scaly carbon. By coloring the base material of the reflective layer 20 in a dark color, the dark color material can absorb light incident between the metal thin films 25 among light incident on the reflective layer 20.

Therefore, from the viewpoint of achieving both the light reflection function and the light absorption function, the dark color material is contained preferably in a range of 1% to 30% by weight relative to the weight of the entire coating material. If the weight ratio is less than 1%, the amount of the dark color material is too small relative to the entire reflection layer 20, and the above-described light absorption effect cannot be sufficiently exhibited. If the weight ratio is more than 30%, the amount of the dark color material becomes too large relative to the base material (binder) of the reflective layer 20, and the light reflection function of the reflective layer 20 is lowered. In addition, from the viewpoint of sufficiently extracting the light absorption effect and sufficiently obtaining the light reflection function, the dark color material is contained in a range of more preferably 10 to 30% by weight relative to the weight of the entire coating material.

In addition, as for the average size of the dark color material, in the case of being granular, the particle diameter is preferably less than 1 μm; in the case of being fibrous, it is preferable that the diameter is less than 0.5 μm and the length is less than 3 μm; in the case of a scale shape, the thickness is preferably less than 0.15 μm, and the dimensions in the longitudinal and transverse directions orthogonal to the thickness direction are preferably less than 10 μm. When the dark color material has a shape of the above size, the dark color material may block reflection of light by the metal thin film 25, reduce reflection efficiency of the reflective layer 20, or prevent the dark color material from being sufficiently mixed in the binder.

Next, the case of external light incident on the reflection screen 10 of the present embodiment will be described.

As shown in fig. 2, unnecessary external light G1, G2 such as illumination light enters mainly from above the reflection screen 10, passes through the surface layer 50 and the base material layer 40, and enters the unit lenses 31 of the lens layer 30. Further, although a part of the external light G1 enters the non-lens surface 33, a part of the external light is diffused at the end of the metal thin film 25 of the reflective layer 20 formed on the rear surface side of the non-lens surface 33, and the amount of the external light is greatly reduced from the image light L1 even when the external light reaches the observer O side. Further, since the external light incident on a part of the non-lens surface 33 is incident on the base material (binder) forming the reflective layer 20 between the metal thin films 25, as described above, the dark color material is contained in the base material, and thus the light is absorbed without being reflected.

As described above, the reflection screen 10 of the present embodiment can display a bright and favorable image with high contrast even in a bright room environment, as in the reflection screen of embodiment 1. In addition, by containing a dark color material in the base material (binder) for forming the reflective layer, the black color of the image can be made clearer, and the contrast of the image can be improved.

In the case of the reflecting panel of the above comparative example, a reflecting layer may be formed on the non-lens surface, and in this case, unnecessary external light such as illumination light may enter the non-lens surface and be reflected by the lens surface, and may reach the observer side, which may prevent satisfactory image display. In contrast, although the reflective screen 10 according to embodiment 2 has the reflective layer 20 formed on the non-lens surface 33, the reflection of the external light incident on the non-lens surface 33 can be greatly reduced because the base material (binder) forming the reflective layer 20 contains a dark color material.

(modification of embodiment 1 and embodiment 2)

Fig. 9 is a diagram showing details of the lens layer and the reflective layer of the reflective screen according to the modification of embodiment 1 and embodiment 2, and corresponds to fig. 3 (b).

In the above embodiment, the example in which the reflective screen 10 is formed such that the reflective layer 20 covers the lens surface 32 and the non-lens surface 33 of the unit lens 31 is shown, but the present invention is not limited thereto. For example, as shown in fig. 9, the reflective layer 20 may be provided on a part of the lens surface 32, only on the non-lens surface 33 side of the adjacent unit lens 31, that is, only on a part contributing to reflection of the image light by the lens surface 32. In this case, since the reflective layer 20 is not formed on the lens surface 32 and a part of the non-lens surface 33, a concealing layer (protective layer) for concealing the rear surface side of the reflective layer 20 is preferably provided.

The metal thin film 25 of the reflective layer 20 of the above embodiment is described as an example using scale-like aluminum, but is not limited thereto, and for example, a metal such as silver or nickel may be used.

In order to maintain the flatness of the screen, the reflective screen 10 of the above embodiment may be configured as follows: the substrate is a transparent substrate layer made of glass or resin and having high rigidity.

In the above embodiment, as shown in a straight line in fig. 2 and the like, an example is shown in which the lens surface 32 and the non-lens surface 33 are planar, but the present invention is not limited thereto, and a part of the lens surface 32 or the non-lens surface 33 may be curved.

In the above embodiment, the lens surface 32 and the non-lens surface 33 of the unit lens 31 are each configured by 1 surface, but the present invention is not limited thereto, and for example, at least one surface may be configured by a plurality of surfaces.

In the above embodiment, the cross-sectional shape of the unit lens 31 shown in fig. 2 and the like is an approximately triangular shape, but the present invention is not limited thereto, and for example, the following may be adopted: the cross-sectional shape is approximately trapezoidal, and the lens surface and the non-lens surface face each other with a top surface parallel to the screen surface interposed therebetween. In this case, the top surface is preferably formed in a region that does not contribute to reflection of image light. The top surface may be provided with a reflective layer, or the top surface may be covered with a protective layer.

In the above embodiment, the base layer 40 has the colored layer 42 and the light diffusion layer 41, but the present invention is not limited thereto, and for example, the base layer 40 may be a system including only the light diffusion layer 41 without the colored layer 42. In this case, the light diffusion layer 41 may contain a coloring material in addition to the diffusion material. In addition, the substrate layer 40 may be formed as follows: the colored layer 42 and the light diffusion layer 41 are provided, and the colored layer 42 further contains a light diffusion material in addition to a colorant. The base layer 40 may be formed by joining the light diffusion layer 41 and the colored layer 42, which are molded separately, to each other with an adhesive or the like.

In the above embodiment, the example in which the image source LS is located below the reflection screen 10 (the reflection screen unit 5) in the vertical direction and the image light L is projected obliquely from below the reflection screen 10 has been described, but the present invention is not limited thereto, and for example, the following method may be used: the image source LS is located above the reflecting screen 10 in the vertical direction, and projects image light L obliquely from above the reflecting screen 10.

In embodiment 2, the example in which carbon is used for the dark color material of the reflective layer has been described for the reflective screen, but the present invention is not limited thereto, and metal salts such as graphite and black iron oxide may be used. The dark color material is not limited to a granular shape, a fibrous shape, or a scaly shape, and may have other shapes. In embodiment 2, an example in which a dark color pigment is used is shown as a dark color material, but the invention is not limited thereto, and for example, a dark color dye may be used. For example, nigrosine-based black dyes (azine-based dyes) or aniline-based black dyes can be used.

(embodiment 3)

Next, embodiment 3 of the present invention will be described with reference mainly to fig. 10 to 17. In the present embodiment, the reflection screen 110, the screen housing 102, the image display system 101, and the like, which are main parts of the present embodiment, are described and illustrated as necessary, and in an actual product, a leg portion for holding the screen housing 102 on the floor 105, a joint portion for holding the screen housing 102 on a wall, and the like are often provided as necessary.

In the present embodiment, for convenience, the X-axis direction shown in the drawings is referred to as the left-right direction (particularly, the direction of the arrow is the right direction), the Y-axis direction is referred to as the up-down direction (particularly, the direction of the arrow is the up direction), and the Z-axis direction is referred to as the front-back direction (particularly, the direction of the arrow is the front direction). The direction of the arrow on the Z axis is referred to as the video source side or the viewer side with reference to the stage, and the direction opposite to the direction of the arrow on the Z axis is referred to as the back side with reference to the stage.

In addition, the front view is a view obtained when a surface (a surface parallel to the XY plane) coinciding with the plane direction of the mounting surface 107 or the sheet-like reflection screen is observed when the mounting surface or the sheet-like reflection screen is observed from the entire image source side (the observer side) in a global manner, in other words, the front view is a view showing a shape observed in a normal direction (Z-axis direction) standing on the reflection screen 110 parallel to the XY plane.

In the present embodiment, the description has been given of the case where the image light is projected from the image source LS provided below the reflection screen 110 to the reflection screen 110, but it is obvious that the same principle is applied to the case where the image light is projected from the image source LS provided above the reflection screen 110 to the reflection screen 110, although the vertical relationship changes.

< Screen frame >

The screen housing 102 in the present embodiment is a screen housing 102 including a reflection screen 110 and an illumination device 115, the reflection screen 110 reflecting image light projected from an image source LS to display the image light in a viewable manner, and a light emitting unit 116 of the illumination device 115 being provided so as to be capable of illuminating at least a part of a light shadow 100 (see fig. 11) generated by the image light reflected at an angle substantially equal to an angle at which the image light L enters the reflection screen 110 from the image source LS. The light emitting unit 116 of the illumination device 115 is provided so as not to directly illuminate the display surface of the reflection screen 110 and the observer O.

By forming such a screen housing 102, the image of the light shadow 100 (fig. 11 (b)) cannot be visually observed by irradiating the light shadow 100 (fig. 11 (a)) generated by the image light having an angle at which the image light enters the reflection screen 110 from the image source LS and an angle at which the image light is reflected substantially equal to each other with the illumination device 115, and the observer O can concentrate the light shadow image on the screen without paying attention to the light shadow image on the ceiling surface 106, thereby comfortably viewing the image.

In addition, if the reflecting screen 110 is designed as follows, the contrast of the screen may not be greatly reduced, and an effect of enabling the indoor brightness to be exhibited: the light irradiated from above onto the reflecting screen 110 is reflected downward or absorbed by the reflecting screen corresponding to the short focus type image source. That is, the illumination light from the illumination device 115 that is irradiated onto the ceiling surface 106 is difficult to visually see the light shadow 100 on the ceiling surface, and is reflected on the ceiling surface 106 to brighten the sides or feet of the observer O, contributing to safe walking of the observer O, and brighten the underside of the hands of the observer O who take notes.

[ light and shadow ]

In this embodiment, the light shadow 100 is the following image: in the image display system 101 shown in fig. 10, an image projected from the image source LS disposed below the lower end 112 of the reflection screen is visually recognized as shown in fig. 11(a) by an image light L5 reflected at an angle substantially equal to the angle of incidence on the reflection surface as shown in L4 of fig. 13, which is generated on the ceiling surface 106. In the present light shadow 100, even when the image light is a moving image, the image of the light shadow changes with the image light, and particularly, the light shadow 100 formed at the position N of the ceiling surface 106 shown in fig. 10 near the upper end 111 of the screen is likely to enter the visual field when the image reflected on the screen is observed, and is clear due to the proximity to the screen, and is likely to attract the attention of the observer.

In the present embodiment, the light shadow 100 on the ceiling surface 106 is illuminated with illumination light by the illumination device 115, and thus is difficult to be visually observed so as to attract the attention of the observer. This takes advantage of the characteristic of the knowledge about human vision, i.e. even if the field of view is entered as such, a still image is not noticeable to the viewer compared to a moving image; in addition, a meaningless monotonous image (illumination, light, shadow, or the like) does not attract the attention of the observer as compared with a meaningless image.

[ reflection screen ]

The reflection screen 110 of the present embodiment has the following functions: a part of the image light irradiated from the image source LS is reflected in such a manner that the observer O can observe it. Since the short-focus type image source LS transmits the image light from above or below the reflection screen 110 at an incident angle larger than that of the conventional image source LS, the reflection screen used for the short-focus type image source LS is often designed to increase the ratio of reflection of the image light projected at a large incident angle at a small reflection angle, so that the image light can be observed more clearly by the observer.

The reflective screen 110 has a large screen (display area) with a diagonal of 80 inches or 100 inches. The size of the screen 110 of the present embodiment is, for example, 80 inches (1771 × 996mm) in diagonal direction.

As shown in fig. 12(b), the reflective screen 110 that reflects the image light projected from the image source LS and displays the image light in a viewable manner is preferably the following reflective screen 110: the lens layer 130 has a lens surface 132 and a non-lens surface 133, and a plurality of unit lenses 131 are arranged in a row to protrude to the back side, and the rear side has a Fresnel lens shape; the reflective layer 120 is formed on at least the lens surface 132 of the unit lens 131, and reflects light.

Fig. 13 is a diagram illustrating an example of the reflecting screen 110 according to the present embodiment. A part of a cross section passing through a point which is the geometric center of the observation screen (display area) of the reflection screen 110, parallel to the screen up-down direction and orthogonal to the screen surface (parallel to the thickness direction) is shown enlarged in fig. 13. The reflection screen 110 includes a surface layer 150, a base material layer 140, a lens layer 130, a reflection layer 120, a light absorption layer 190, and the like in this order from the image source LS side (the observer O side).

The base layer 140 is a sheet-like member serving as a base material for forming the lens layer 130. A surface layer 150 is laminated on the image source LS side (viewer O side) of the base material layer 140, and a lens layer 130 is laminated on the back side (rear side).

The base material layer 140 has a light diffusion layer 141 and a colored layer 142. The specific configuration of the substrate layer 140 is the same as that of the substrate layer 40 of embodiment 1, and therefore, the description thereof is omitted here.

Fig. 12 is a diagram illustrating the lens layer 130 according to the present embodiment. Fig. 12(a) shows the case where the lens layer 130 is viewed from the back-side front direction, and the reflection layer 120 and the light absorption layer 190 are omitted for ease of understanding. Fig. 12(b) shows a part of the cross section shown in fig. 13 in a further enlarged scale.

The lens layer 130 is convex toward the back surface side, and includes a plurality of unit lenses 131 including a lens surface 132 and a non-lens surface 133. The specific structure and formation method of the lens layer 130 are the same as those of the lens layer 30 of embodiment 1, and therefore, the description thereof is omitted here.

The reflective layer 120 is a layer having an effect of reflecting light. The reflective layer 120 is formed on at least the lens surface 132. As shown in fig. 12(b) and 13, the reflective layer 120 of the present embodiment is formed on the lens surface 132, but is not formed on the non-lens surface 133.

The reflective layer 120 can be formed by applying and curing the following materials by various coating methods such as spray coating, die coating, screen printing, and groove filling by wiping: white or silver based paints; an ultraviolet-curable resin or a thermosetting resin containing a white or silver pigment or bead; a coating material containing particles or fine flakes obtained by pulverizing a metal vapor-deposited film or a metal foil of silver, aluminum, or the like; and so on. The reflective layer 120 may be formed by depositing or sputtering a metal such as aluminum, silver, or nickel on the lens surface 132, or by transferring a metal foil. The reflective layer 120 of the present embodiment can be formed by depositing aluminum on the lens surface 132.

The light absorbing layer 190 is provided on the rear surface side of the lens layer 130 and the reflective layer 120, and has a function of absorbing light. The light absorbing layer 190 of the present embodiment is formed so as to cover the reflective layer 120 and the non-lens surface 133, and the light absorbing layer 190 is formed on the non-lens surface 133.

The light absorbing layer 190 may be formed by: the light absorbing layer 190 is formed by applying a black or other dark color paint, or a thermosetting resin or ultraviolet curable resin containing a black or other dark color pigment, dye, and light absorbing beads, to the back side (fresnel lens shape side) of the lens layer 130 having the reflecting layer 120 formed on the lens surface 132, and curing the resin.

The surface layer 150 is a layer provided on the image source side (viewer side) of the base material layer 140. The specific structure and formation method of this surface layer 150 are the same as those of the surface layer 50 of embodiment 1 described above, and therefore, description thereof is omitted here.

Next, the case of the image light and the external light incident on the reflection screen 110 of the present embodiment will be described. Fig. 13 is a diagram illustrating the case of image light or external light incident on the reflective screen 110. In fig. 13, a part of a cross section parallel to the vertical direction and the thickness direction of the screen of the reflecting screen 110 is shown in an enlarged manner, and for easy understanding, the refractive index difference of each layer of the reflecting screen 110, the diffusion function of the light diffusion layer 141, and the like are omitted.

As shown in fig. 13, most of the image light L3 projected from the image source LS enters from below the reflection screen 110, passes through the surface layer 150 and the base material layer 140, and enters the unit lenses 131 of the lens layer 130. The image light L3 enters the lens surface 132, is reflected by the reflective layer 120, and is reflected by the reflective screen 110 toward the viewer O. Note that the angle β (see fig. 12 b) is larger than the incident angle of the image light L3 at each point in the vertical direction of the screen of the reflection screen 110, and the image light L3 is projected from below the reflection screen 110, so that the image light L3 does not directly enter the non-lens surface 133, and the non-lens surface 133 does not affect the reflection of the image light L3.

On the other hand, as shown in fig. 13, unnecessary external light G3, G4 such as illumination light enters mainly from above the reflection screen 110, passes through the surface layer 150 and the base material layer 140, and enters the unit lenses 131 of the lens layer 130. Part of the external light G3 enters the non-lens surface 133 and is absorbed by the light absorbing layer 190. Since a part of the external light G4 is reflected by the lens surface 132 and mainly directed to the lower side of the reflection screen 110, it does not directly reach the observer O side, and the amount of the external light is much smaller than the video light L3 even when the external light reaches the observer O side. Therefore, in the reflecting screen 110, the contrast of the image can be suppressed from being lowered by the external light G3 or G4.

As the reflecting screen of the present embodiment, the reflecting screen 10 of embodiment 1 or embodiment 2 may be used. That is, the reflecting panel 10 includes at least a base material layer 40 and a lens layer 30, two or more unit lenses 31 are arranged in the lens layer 30, the unit lens 31 is projected from the substrate layer 40 side to the back surface side, the unit lens has a lens surface 32 and a non-lens surface 33, a reflection layer 20 for reflecting light is provided on at least a part of the lens surface 32, the reflection layer 20 has a resin and a plurality of metal sheets 25 dispersed in the resin, the metal sheets 25 are arranged so that a surface perpendicular to a thickness direction thereof is substantially parallel to the lens surface 32, the screen frame 102 includes the reflection screen 10 and an illumination device 115 having a light emitting portion 116, the light emitting portion 116 of the illumination device 115 is provided so as to be capable of illuminating at least a part of the shadow 100, the shadow 100 is generated by image light reflected at an angle substantially equal to the angle when the image light is incident on the reflective screen 10 from the image source LS.

When the shadow 100 generated on the ceiling surface 106 is illuminated by the reflection screens 10 and 110, even if the illumination light reflected on the ceiling surface 106 reaches the

screens

10 and 110, the behavior is similar to that of the unnecessary external light G3 and G4 from above, and therefore the influence on the quality of the image projected on the reflection screens 10 and 110 is extremely slight.

In addition, some of the image light projected from below by the

reflective screen

10 or 110 is reflected by the surface of the

reflective screen

10 or 110 on the image source LS side. As shown in fig. 13, light L4 reaching above the reflection screens 10 and 110 and reflected on the surfaces thereof is reflected substantially regularly above the reflection screens 10 and 110 as with light L5 and reaches the ceiling surface 106 and the like. When the lighting device 115 is not provided, the light L5 is a factor of image reflection on the ceiling surface 106, and thus prevents comfortable visual observation of an image. When the reflection screens 10 and 110 are disposed in a darkroom environment or when the projected image is a moving image, the brightness of the light and shadow portion of the ceiling surface 106 is noticeable, or a blurred moving image is visually observed in the ceiling surface 106, and therefore, when the image displayed on the reflection screens 10 and 110 is visually observed by the observer O, comfortable visual observation is greatly hindered. This embodiment takes measures against the shadow 100.

The rear surface of the reflection screen 110 is provided with a support plate similar to the support plate 60 of embodiment 1 through a bonding layer, not shown, made of an adhesive material or the like, and the flatness thereof is maintained by the support plate. The reflecting screen 110 is not limited to this, and may be supported by a frame member or the like, not shown, to maintain its planarity.

[ Lighting device ]

In the present embodiment, the illumination device 115 includes at least a light emitting unit 116 provided so as to be able to illuminate at least a part of the shadow 100, the shadow 100 being generated by the image light reflected at an angle substantially equal to the angle at which the image light enters the

reflective screens

10 and 110 from the image source LS. The light emitting unit 116 of the illumination device 115 is provided so as not to directly illuminate the display surface of the

reflection screen

10, 110 and the observer O.

As described above, by providing the illumination device 115 to the screen housing 102 and overlapping the illumination region S of the illumination device 115 with the light and shadow 100, the image due to the light and shadow 100 becomes difficult to be observed. Therefore, even if the image light projected from the image source LS is a moving image, the viewer O cannot notice the image because the image light is not easily seen, and can view the image light comfortably by focusing only on the image projected on the reflection screens 10 and 110.

Further, by providing the display surface of the

reflection screen

10 or 110 not to directly illuminate the observer O, the observer O does not feel glare from the illumination device, and quality degradation such as a decrease in contrast of an image reflected on the

reflection screen

10 or 110 does not occur.

As is readily understood from fig. 10, 15, 16, and 17, the light emitting portion 116 is described as a light bulb shape, but in the present embodiment, the light emitting portion is not limited to a light bulb as long as it is an object that emits light. In this embodiment, as a light-emitting device which can be used as the light-emitting portion 116, a fluorescent lamp, an electric bulb, a cold cathode tube, a light-emitting diode (LED), an organic electroluminescence element (OLED), or the like can be exemplified.

In this embodiment mode, the lighting device 115 may include a power supply device or a driving circuit corresponding to the light emitting device to be used. The light obtained by the light emitting unit 116 may be divided and guided by an optical fiber, a mirror, a lens, a prism, or the like.

The lighting device 115 shown in fig. 14 is provided on the entire upper portion of the housing in the left-right direction, but may be provided at only one or more positions. The main point is that since the shadow 100 is close to the

screens

10 and 110, particularly, the image of the portion N of the image, that is, the shadow portion that the observer O is particularly concerned about, can be clearly judged to be hardly recognizable, it is sufficient to irradiate a sufficient illumination area with illumination light of a sufficient light quantity.

The light emitting unit 116 of the illumination device 115 in the present embodiment is preferably provided so as not to directly illuminate the observer O. In other words, it is preferable that the light emitting unit 116 of the illumination device 115 is not directly visible from the observer O. With such an illumination device 115, when the observer O observes the image reflected on the surface of the

screen

10 or 110, the illumination light from the light emitting unit 116 of the illumination device 115 can be prevented from entering the eyes of the observer O, and the observer O can comfortably view the image while concentrating on the image.

In the embodiment, the light emitting unit 116 of the illumination device 115 is preferably provided so as not to directly illuminate the display surface of the

reflection screen

10 or 110. With such an illumination device 115, when the observer O observes the image reflected on the surface of the

screen

10 or 110, the illumination light from the illumination device can be prevented from being reflected on the surface of the

screen

10 or 110, and the observer O can comfortably view the image while concentrating on the image.

In order to realize such an installation position, as shown in fig. 14(a) and 15, the light emitting unit 116 is installed on the back side of the reflection screens 10 and 110 at a position where the observer O looks as a shadow of the reflection screens 10 and 110 and the light emitting unit 116 cannot be seen, whereby the illumination device 115 can be prevented from directly illuminating the observer O and the reflection screens 10 and 110.

That is, as shown in fig. 14(a) and 15, the light emitting unit 116 is provided on the rear surface side of the

reflection panels

10 and 110, so that the illumination light does not directly irradiate the display surfaces of the

reflection panels

10 and 110. Further, by providing the light emitting portion 116 at a position where the light emitting portion 116 cannot be viewed from the observer O as a shadow of the

reflective screen

10 or 110, the

reflective screen

10 or 110 is present between the observer O and the light emitting portion 116, and the observer O can be prevented from directly viewing the light emitting portion 116 and feeling dazzling.

In the present embodiment, as shown in fig. 14(b) and 16, in order to prevent the illumination device 115 from directly illuminating the observer O and the

reflective screens

10 and 110, the light shielding portion 117 is provided around the light emitting portion 116, so that the illumination device 115 can be prevented from directly illuminating the observer O and the

reflective screens

10 and 110. As the light shielding portion 117, for example, a light shielding cover can be used.

That is, as shown in fig. 14(b) and 16, in order that the illumination light of the light emitting portion 116 does not directly irradiate the display surface of the

reflective screen

10 or 110, and in order that the light emitting portion 116 is not visible from the observer O because the light emitting portion 116 is seen as a shadow of the light shielding portion, the light shielding portion 117 is provided around the light emitting portion 116, so that the light shielding portion 117 is present between the observer O and the light emitting portion 116, and the observer O can be prevented from directly seeing the light emitting portion 116 and feeling dazzling.

By providing such a light shielding portion 117, the degree of freedom of the installation position of the illumination device 115 (light emitting portion 116) is improved, and by providing a reflection function on the light emitting portion 116 side of the light shielding portion 117, there is an advantage that light from the light emitting portion 116 can be effectively utilized.

Further, the provision of such a light shielding portion 117 can be applied to a screen housing 102 having a screen storage portion 103 for winding and storing the reflection screens 10 and 110 as shown in fig. 17.

[ image display System ]

In the present embodiment, as shown in fig. 10, 15, and 16, the video display system 101 includes at least a video source LS,

reflective screens

10 and 110, and an illumination device 115, and the

reflective screens

10 and 110 reflect video light projected from the video source LS and display the reflected light in a viewable manner. In the present image display system 101, as described above, the light emitting unit 116 of the illumination device 115 is provided so as to be able to illuminate at least a part of the shadow 100 generated by the image light having the angle at which the image light enters the reflection screens 10 and 110 from the image source LS and the angle at which the image light is reflected are substantially equal. The light emitting unit 116 of the illumination device 115 is provided so as not to directly illuminate the display surface of the

reflection screen

10 or 110 and the observer O.

The video display system 101 of the present embodiment is a general video display system in which the

reflection panels

10 and 110 reflect video light projected from the video source LS and display a video on the screen thereof. The video display system 101 is not limited to this, and may be, for example, a front projection television system or the like in which video light is projected from a video source LS, or an interactive board system including the

reflection panels

10 and 110, the video source LS, and a position detection unit for detecting the position of an input unit on the observation screen of the

reflection panels

10 and 110, and a personal computer or the like.

The image source LS is a device for projecting image light onto the

reflection screen

10 or 110, and a general-purpose short-focus projector or the like can be used. When the screen of the

reflection screen

10 or 110 is viewed from the normal direction (normal direction of the screen surface) in the use state, the image source LS is disposed at the center of the

reflection screen

10 or 110 in the screen left-right direction and below the screen (display area) of the

reflection screen

10 or 110. The screen surface is a surface that is in the plane direction of the reflecting

screen

10 or 110 when viewed as the

whole reflecting screen

10 or 110. The image source LS can project image light from a position far closer to the reflecting

screen

10 or 110 in a direction orthogonal to the screen of the reflecting screen 10 or 110 (the thickness direction of the reflecting screen 10 or 110) than a conventional general-purpose projector. That is, the projection distance from the image source LS to the reflection screens 10 and 110 is shorter than that of the conventional general-purpose projector, and the incident angle of the image light with respect to the reflection screens 10 and 110 is also large.

More specifically, a 100 inch reflective screen 110 having an effective height of 1245mm and an effective width of 2214mm is illustrated. As shown in fig. 10, the image display system 101, which is the subject of the present embodiment, is provided in a portion of the reflection screen 110 having the ceiling surface 106. The distance from the floor surface to the ceiling surface was 3.0 m.

The image source LS was installed at a position lower than the lower end 112 of the reflecting screen 110 using a projector PDG-DWL4500J manufactured by sanyo corporation, and the dimension d4 from the lower end 112 of the reflecting screen to the floor 105 was 0.6m, and the image source LS was disposed at a position where the projection port for projecting image light was 0.44m in d1 toward the viewer O side from the center in the left-right direction of the reflecting screen 110 and 0.28m in d2 downward from the lower end 112 of the reflecting screen 110. At this time, the image light directed to the center of the reflecting screen 110 enters at an incident angle of 64 degrees in the vertical direction of the screen.

The screen frame 102 has the above-described reflection screen 110 and the illumination device 115. The light emitting unit 116 of the illumination device 115 is provided at the center of the reflection screen 110 in the lateral direction, and is located on the rear surface side of the display surface and below the upper end 111 of the reflection screen, using an incandescent lamp. Therefore, the illumination light irradiated by the incandescent lamp does not directly illuminate the observer O and the display surface of the reflective screen 110. Further, the incandescent lamp as the light emitting unit 116 cannot be directly viewed by the observer O.

When the illumination device 115 is not turned on, and the image source LS irradiates moving image light and reflects an image on the surface of the reflecting screen 110, as shown in fig. 11(a), the light shadow 100 is generated on the ceiling surface 106 by the image light reflected at an angle substantially equal to the angle at which the image light enters the reflecting screen 110 from the image source LS. The light shadow 100 reflects the change of the image light of the moving image and moves, thereby attracting the attention of the observer O.

Here, when the lighting device 115 is turned on, the observer O cannot recognize the image of the light and shadow 100 generated on the ceiling surface 106 as an image, as shown in fig. 11 (b). That is, the observer O recognizes that the illumination light is applied only to the ceiling surface 106, and thus cannot attract the attention of the observer O. In this case, the influence of the illumination light on the quality of the image reflected on the reflecting screen 110 cannot be perceived. At this time, although the indoor lighting is turned off, the body and feet become bright. Therefore, in the case of a simple note, the observer O can take the note while viewing the video. In addition, the user can visually observe the foot condition and safely move indoors.

The above embodiments and modifications may be combined as appropriate, but detailed description is omitted. The present invention is not limited to the embodiments described above.

Claims

1. A screen frame body is provided with a reflecting screen and an illuminating device with a light emitting part, wherein the reflecting screen reflects image light projected by an image source and displays the image light in a observable manner, the image source is arranged at a position lower than the lower end of the reflecting screen,

the light emitting unit of the illumination device is provided so as to be capable of illuminating at least a part of a light shadow generated on a ceiling surface located above the reflection screen by the image light reflected at an angle substantially equal to an angle at which the image light enters the reflection screen from the image source.

2. The screen frame according to claim 1, wherein the light emitting portion of the illumination device is provided so as not to directly illuminate the display surface of the reflection screen.

3. An image display system comprising an image source, a reflection screen for reflecting image light projected from the image source and displaying the reflected image light in a viewable manner, and an illumination device having a light emitting section,

the image source is disposed at a lower position than the lower end of the reflective screen,

4. The image display system according to claim 3, wherein the light emitting portion of the illumination device is provided so as not to directly illuminate the display surface of the reflection screen.

5. The image display system according to claim 3, wherein the light emitting portion of the illumination device is provided on a back side of the display surface of the reflection screen and below an upper end of the reflection screen.

6. The image display system of claim 3, wherein a light shielding portion is provided that prevents the light emitting portion of the illumination device from directly illuminating the display surface of the reflective screen.