JP6812761B2 - Reflective screen, video display device - Google Patents

Description

The present invention relates to a reflective screen and an image display device including the reflective screen.

Conventionally, various screens have been developed as screens that reflect or transmit image light projected from an image source and display them (see, for example, Patent Document 1). In particular, transparent screens are in high demand due to their high design, because the scenery on the other side of the screen can be seen through when not in use, which does not project image light.
Further, various display devices and the like in which various screens are arranged to form a large screen display screen have been developed (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 9-114003 JP-A-2002-162689

When the semi-transmissive reflective screen as described above is provided with a light diffusing layer containing diffusing particles having a function of diffusing light, the scenery on the other side of the screen is observed whitish and blurred, and has a design property. Improving transparency has been an issue because it causes a decrease.
In addition, when a plurality of screens are arranged to make a large screen, the non-display portion of the boundary portion (seam) of each screen becomes a dark line and is easily observed by the observer, resulting in deterioration of image quality and design. There was a problem such as inviting.

The above-mentioned Patent Document 1 proposes a screen that can be used for both a transmissive type and a reflective type, and can transmit light from the back surface side. However, Patent Document 1 does not disclose any improvement in screen transparency. Further, Patent Document 1 does not disclose at all about arranging a plurality of screens to increase the screen size and suppressing the visibility of seams.

Further, Patent Document 2 described above has been made as an object to suppress the occurrence of a non-display portion of a boundary portion between the arranged screens in a large screen display device in which a plurality of transmissive screens are arranged. However, Patent Document 2 does not disclose anything about improving the non-display portion of the boundary portion (seam) when a plurality of reflective screens and transparent screens are arranged.

An object of the present invention is to provide a reflective screen in which a plurality of transparent screen portions are arranged to increase the size of the screen and a video display device including the reflective screen in which joints (non-display portions) between the screen portions are inconspicuous. It is to provide a video display device provided.

The present invention solves the above-mentioned problems by the following solutions. In addition, in order to facilitate understanding, the description will be given with reference numerals corresponding to the embodiments of the present invention, but the present invention is not limited thereto.
The invention of claim 1 is a plurality of screen units (10, 20, 30) that reflect a part of the image light projected from a plurality of image sources to display an image and transmit a part of the image light. Is a reflective screen formed by arranging in at least one direction, each of the plurality of screen portions has light transmission, and a plurality of unit optical shapes (121,221,321) are formed on the back surface side. The arranged optical shape layers (12, 22, 32) and the surface formed on at least a part of the unit optical shape, and the surface on the unit optical shape side is a rough surface having an irregular uneven shape and is incident. The screen portion includes a reflective layer (13, 23, 33) having a function of reflecting a part of light and transmitting at least a part of other incident light, and the adjacent screen portion is in the thickness direction. The laminated regions (W1 and W2) are integrally laminated, and the reflectance of the reflective layer is continuously or gradually reduced toward the end of the screen portion, at least in the laminated region. It is a reflective screen (100, 200) characterized by that.
The invention of claim 2 is the reflective screen according to claim 1, wherein the reflective layer (13, 23,) at the end of the laminated region (W1, W2) of the screen portion (10, 20, 30). The reflective screen (100, 200) is characterized in that the reflectance of 33) is 0%.
The invention of claim 3 is the reflective screen according to claim 1 or 2, wherein the optical shape layer (12, 22, 32) has the unit optical shape (121,221, 321) on a back surface. ) Are concentrically arranged in a plurality of circular Frenel lens shapes, the reflective screen (100, 200) is characterized.
According to a fourth aspect of the present invention, in the reflective screen according to the third aspect, the circular Fresnel lens shape indicates the screen portion (10, 20, 30) at a point (C1, C2, C3) at which the Fresnel center is formed. A reflective screen (100,200) characterized by being located outside the region.
The invention of claim 5 is formed by arranging a plurality of the screen portions (10, 20, 30) having the same shape in the reflective screen according to any one of claims 1 to 4. It is a reflective screen (100, 200) characterized by being present.
The invention of claim 6 is the reflective screen according to any one of claims 1 to 5, wherein the screen portion includes a light absorbing layer having an action of absorbing light. It is a reflective screen.
According to the invention of claim 7, in the reflective screen according to any one of claims 1 to 6, the reflective layer (13, 23, 33) is formed of a dielectric multilayer film. It is a reflective screen (100, 200) characterized by.
The invention of claim 8 is the reflective screen according to any one of claims 1 to 7, wherein the screen portion includes a light diffusion layer containing diffusion particles having an action of diffusing light. It is a reflective screen (100, 200) characterized by the absence.
The invention according to claim 9 has at least one of an antireflection function, a hard coat function, an antistatic function, and an antifouling function on the image source side in the reflection screen according to any one of claims 1 to 8. It is a reflective screen characterized by having a layer having one function.
The invention of claim 10 applies to the reflective screen (100,200) according to any one of claims 1 to 9, and the plurality of screen portions (10, 20, 30) included in the reflective screen. An image display device (1, 2) including a plurality of image sources (LS1, LS2, LS3) corresponding to each and projecting image light onto the corresponding screen unit.

According to the present invention, in a reflective screen in which a plurality of transparent screen portions are arranged to increase the screen size and an image display device including the reflective screen, a reflective screen in which seams (non-display portions) between the screen portions are inconspicuous and the reflective screen thereof. A video display device can be provided.

It is a figure explaining the image display device 1 of 1st Embodiment. It is a figure explaining the layer structure of the screen 100 of 1st Embodiment. It is a figure which looked at the 1st optical shape layer 12 and the 2nd optical shape layer 22 of 1st Embodiment from the back side (−Z side), respectively. It is a figure explaining the state of the image light and the outside light in the screen vertical direction (Y direction) of the screen 100 of 1st Embodiment. It is a figure explaining the reflectance of the 1st reflective layer 13 and the 2nd reflective layer 23 of 1st Embodiment. It is a figure explaining the reflected light (video light) from the screen 100 of 1st Embodiment. It is a figure explaining the image display device 2 of the 2nd Embodiment. It is a figure explaining the 3rd screen part 30 of 2nd Embodiment. It is a figure explaining the reflectance of each reflective layer of 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings and the like. In addition, each figure shown below including FIG. 1 is a diagram schematically shown, and the size and shape of each part are exaggerated as appropriate for easy understanding.
In the present specification, terms that specify a shape or a geometric condition, for example, terms such as parallel and orthogonal, have the same optical function in addition to their strict meanings, and can be regarded as parallel or orthogonal. It shall also include the state having the error of.
Numerical values such as dimensions of each member and material names described in the present specification are examples of embodiments, and are not limited thereto, and may be appropriately selected and used.

In this specification, terms such as board and sheet are used, but as a general usage, they are used in the order of thickness, board, sheet, and film. Above all, it is used following that. However, since there is no technical meaning in such proper use, these words can be replaced as appropriate.
Further, in the present specification, the screen surface indicates a surface in the plane direction of the screen when viewed as the entire screen, and is assumed to be parallel to the screen (display surface) of the screen.

(First Embodiment)
FIG. 1 is a diagram illustrating a video display device 1 of the first embodiment. FIG. 1A is a view of the image display device 1 viewed from the front side of the image source side, and FIG. 1B is a view of the image display device 1 viewed from the upper side in the vertical direction. c) is a side view of the image display device 1.
The image display device 1 has a screen 100, a first image source LS1, a second image source LS2, and the like. The screen 100 is formed by arranging a plurality of screen portions (in the present embodiment, the first screen portion 10 and the second screen portion 20). Further, the screen 100 can reflect a part of the image light projected from each image source and display the image on the screen (display area) on the image source side, and is also one of the incident image lights. The part is transparent.

Here, in order to facilitate understanding, in each of the following figures including FIG. 1, an XYZ Cartesian coordinate system is appropriately provided and shown. In this coordinate system, the screen horizontal direction (horizontal direction) of the screen 100 is the X direction, the screen vertical direction (vertical direction) is the Y direction, and the thickness direction of the screen 100 is the Z direction. The screen of the screen 100 is parallel to the XY plane, and the thickness direction (Z direction) of the screen 100 is orthogonal to the screen of the screen 100.
Further, when viewed from the observer O1 located in the front direction of the image source side in the thickness direction of the screen 100, the direction toward the right side in the left-right direction of the screen is the + X direction, the direction toward the upper side in the vertical direction of the screen is the + Y direction, and the thickness direction. The direction from the back side (back side) to the image source side is the + Z direction.
Further, in the following description, the screen vertical direction, the screen horizontal direction, and the thickness direction are the screen vertical direction (vertical direction), the screen horizontal direction (horizontal direction), and the screen vertical direction in the usage state of the screen 100, unless otherwise specified. It is assumed that the thickness direction (depth direction) is parallel to the Y direction, the X direction, and the Z direction, respectively.

The first image source LS1 and the second image source LS2 are image projection devices (projectors) that project image lights L1 and L2 onto the screen 100. The first image source LS1 and the second image source LS2 of the present embodiment are short focus type projectors. Each video source projects video light onto the corresponding screen unit.

The first video source LS1 projects the video light L1 onto the first screen unit 10. The first video source LS1 is a case where the screen (display area) of the first screen unit 10 is viewed from the front direction (normal direction of the screen surface) of the video source side (+ Z side) in the usage state of the video display device 1. In addition, it is located at the center of the first screen unit 10 in the left-right direction (X direction) of the screen, and is located on the lower side (−Y side) in the vertical direction with respect to the screen of the first screen unit 10.
Further, the second video source LS2 projects the video light L2 onto the second screen unit 20. When the screen (display area) of the second screen unit 20 is viewed from the front direction (normal direction of the screen surface) of the image source side (+ Z side) when the second image source LS2 is in use of the image display device 1. In addition, it is located at the center of the second screen unit 20 in the left-right direction (X direction) of the screen, and is located on the lower side (−Y side) in the vertical direction of the screen of the second screen unit 20.

The first image source LS1 and the second image source LS2 are located in the depth direction (Z direction) from a position where the distance from the surface of the screen 100 on the image source side (+ Z side) is significantly closer than that of the conventional general-purpose projector. The image lights L1 and L2 can be projected diagonally. Therefore, the first image source LS1 and the second image source LS2 have a shorter projection distance to the screen 100 than the conventional general-purpose projector, and the projected image lights L1 and L2 are the screen 100 (first screen unit 10, The incident angle incident on the second screen portion 20) and the amount of change in the incident angle (the amount of change from the minimum value to the maximum value) are large.

The screen 100 displays a video by reflecting a part of the video light L1 and L2 projected by the first video source LS1 and the second video source LS2 toward the observer O1 side located on the video source side (+ Z side). However, it is a semi-transmissive reflective screen that transmits a part of the video light to the back side (-Z side). The screen 100 has transparency that allows the scenery on the other side of the screen 100 to be observed when not in use, which does not project image light.
As shown in FIG. 1B, the screen 100 includes a first screen portion 10 and a second screen portion 20 for displaying an image, transparent layers 801, 802, and a bonding layer 101 for integrally bonding these. doing.

The screen (display area) of the screen 100 of the present embodiment has a substantially rectangular shape whose long side direction is parallel to the left-right direction of the screen when viewed from the observer O1 side on the image source side (+ Z side) in the used state.
Further, the first screen unit 10 and the second screen unit 20 of the present embodiment have a rectangular shape in which the screen (display area) is horizontally long when viewed from the front direction (Z direction) in the used state. Then, the first screen portion 10 and the second screen portion 20 are arranged in the left-right direction of the screen, and at the center portion of the screen 100 in the left-right direction (X direction) of the screen, the right end portion of the first screen portion 10 and the second screen The left end portion of the portion 20 is laminated in the thickness direction, and is integrally joined by the joining layer 101.

The transparent layers 801, 802 are layers having light transmittance.
The transparent layer 801 is located on the back surface side (−Z side) of the first screen unit 10, and the transparent layer 802 is located on the image source side (+ Z side) of the second screen unit 20. The transparent layers 801, 802 are integrally laminated as the screen 100 via the bonding layer 101. The transparent layers 801, 802 are provided in a size and thickness so as to fill a step caused by laminating the screen portions in the thickness direction and to make the front and back surfaces of the screen 100 flat. By providing the transparent layers 801, 802, the thickness of the screen 100 as a whole becomes uniform or substantially uniform, so that the screen 100 can be easily handled. Further, by providing the transparent layers 801, 802, when the screen 100 is joined to a transparent support plate or the like, which will be described later, the joining can be facilitated.

The transparent layers 801, 802 are made of a light-transmitting polyester resin such as PET (polyethylene terephthalate), acrylic resin, styrene resin, acrylic styrene resin, PC (polycarbonate) resin, alicyclic polyolefin resin, and TAC (triacetyl cellulose). ) A layer formed of resin. Further, the transparent layers 801, 802 may be formed of glass or the like.

The bonding layer 101 is a layer formed of a highly light-transmitting pressure-sensitive adhesive or adhesive. The bonding layer 101 is located between the first screen portion 10 and the second screen portion 20 in the thickness direction of the screen 100, and is provided on the entire display area of the screen 100 in the present embodiment. The bonding layer 101 integrally joins the first screen portion 10 and the second screen portion 20 in the laminated region W1, and in regions other than the laminated region W1, the first screen portion 10 and the transparent layer 801 and the second screen The portion 20 and the transparent layer 802 are integrally joined.

The bonding layer 101, transparent layers 801, 802, a layer on the back surface side of the first screen unit 10 (first protective layer 15 in this embodiment), and a layer on the image source side of the second screen unit 20 (this embodiment). In the form, it is preferable that there is no difference in refractive index from the second base material layer 21) or that the difference in refractive index is as small as possible from the viewpoint of suppressing unnecessary light reflection between layers.

The screen size of the screen 100 is about 40 to 100 inches diagonally, and the aspect ratio of the screen is 16: 9. Not limited to this, the screen size of the screen 100 may be, for example, about 40 inches or less, and the size and shape of the screen 100 can be appropriately selected according to the purpose of use, the environment of use, and the like. ..
In general, the screen 100 is a laminated body of thin layers made of resin or the like, and in many cases, the screen 100 alone does not have sufficient rigidity to maintain flatness. Therefore, the screen 100 may be formed by integrally joining (or partially fixing) a support plate (not shown) via a joint layer (not shown) having light transmission on the back surface side thereof to maintain the flatness of the screen. Good.
Such a support plate is a flat plate-shaped member having light transmittance and high rigidity, and a plate-shaped member made of resin such as acrylic resin or PC resin or made of glass can be used.
Further, the screen 100 may be in a form in which its four sides or the like are supported by a frame member or the like (not shown) to maintain its flatness.

FIG. 2 is a diagram illustrating a layer structure of the screen 100 of the first embodiment. In FIG. 2A, the screen passes through a point A1 (see FIG. 1) that is the center of the screen (geometric center of the screen) on the image source side (+ Z side) of the first screen unit 10 and is in the vertical direction (Y direction) of the screen. A part of the cross section parallel to the screen surface and perpendicular to the screen surface (parallel to the Z direction) is shown enlarged. In FIG. 2B, the screen vertically (Y direction) passes through a point A2 (see FIG. 1) that is the center of the screen (geometric center of the screen) on the image source side (+ Z side) of the second screen unit 20. A part of the cross section parallel to the screen surface and perpendicular to the screen surface (parallel to the Z direction) is shown enlarged.
FIG. 3 is a view of the first optical shape layer 12 and the second optical shape layer 22 of the first embodiment as viewed from the back surface side (−Z side), respectively. FIG. 3A is a view of the first optical shape layer 12 viewed from the back side, and FIG. 3B is a view of the second optical shape layer 22 viewed from the back side. For ease of understanding, FIGS. 3A and 3B show only the first optical shape layer 12 and the second optical shape layer 22, respectively.

The first screen unit 10 reflects a part of the image light L1 from the first image source LS1 to display an image, and transmits a part of the image light L1.
The second screen unit 20 reflects a part of the image light L2 from the second image source LS2 to display an image, and transmits a part of the image light L2. Further, in the laminated region W1 in which the first screen portion 10 and the second screen portion 20 are laminated in the thickness direction (Z direction), the second screen portion 20 located on the back side of the first screen portion 10 is the first. 1 A part of the image light L2 transmitted through the screen unit 10 is reflected to display the image.

The first screen portion 10 includes a first base material layer 11, a first optical shape layer 12, a first reflective layer 13, a first resin layer 14, and a first protective layer 15 in this order from the image source side (+ Z side). ing.
Further, the second screen portion 20 is located on the back side (−Z side) of the first screen portion 10, and the second base material layer 21, the second optical shape layer 22, and the second reflection are arranged in this order from the image source side. It includes a layer 23, a second resin layer 24, and a second protective layer 25.
The first screen portion 10 and the second screen portion 20 of the present embodiment are screens having the same shape. Therefore, the image display area of the first screen unit 10 and the image display area of the second screen unit 20 have the same rectangular shape and the same size.

First, the first screen unit 10 will be described.
The first base material layer 11 is a sheet-like member having light transmission. The first optical shape layer 12 is integrally formed on the back surface side (back surface side, −Z side) of the first base material layer 11. The first base material layer 11 is a layer serving as a base material (base) for forming the first optical shape layer 12. Further, the first base material layer 11 may have a function of protecting the image source side (+ Z side) of the screen 100.
The first base material layer 11 is, for example, a polyester resin such as PET (polyethylene terephthalate) having high light transmittance, an acrylic resin, a styrene resin, an acrylic styrene resin, a PC (polycarbonate) resin, an alicyclic polyolefin resin, or a TAC (. Triacetyl cellulose) Formed from resin or the like.

The first optical shape layer 12 is a light-transmitting layer formed on the back surface side (−Z side) of the first base material layer 11. A plurality of first unit optical shapes (unit lenses) 121 are arranged and provided on the back surface of the first optical shape layer 12.
As shown in FIG. 3A, the first unit optical shape 121 is a partial shape (arc shape) of a perfect circle and is located outside the screen of the screen 100 (outside the display area of the first screen unit 10). A plurality of concentric circles are arranged around the point C1. That is, the first optical shape layer 12 has a so-called offset structure circular Fresnel lens shape with the point C1 as the Fresnel center on the back surface side.
As shown in FIG. 3A, this point C1 is located at the center of the display area of the first screen unit 10 in the left-right direction and below the outside of the display area, and when the screen 100 is viewed from the front direction. , Point C1 and point A1 are located on the same straight line parallel to the Y direction.

As shown in FIG. 2, the first unit optical shape 121 has a cross-sectional shape parallel to the direction orthogonal to the screen surface (Z direction) and substantially parallel to the arrangement direction of the first unit optical shape 121. It has a triangular shape.
The first unit optical shape 121 (unit lens) is convex toward the back surface, and has a first slope (lens surface) 121a on which image light is incident and a second slope (non-lens surface) 121b facing the first slope (lens surface) 121a. doing. In one first unit optical shape 121, the second slope 121b is located below the first slope 121a with the apex t1 in between.

The angle formed by the first slope 121a with the surface parallel to the screen surface is θ1. The angle formed by the second slope 121b with the plane parallel to the screen plane is θ2. The angles θ1 and θ2 satisfy the relationship of θ2> θ1.
The first slope 121a and the second slope 121b of the first unit optical shape 121 are rough surfaces having fine and irregular uneven shapes. This uneven shape is formed by irregularly arranging fine convex shapes and concave shapes in a two-dimensional direction, and the convex shape and concave shape have irregular sizes, shapes, heights, and the like.

The arrangement pitch of the first unit optical shape 121 is P1, and the height of the first unit optical shape 121 (the dimension from the apex t1 in the thickness direction to the point v1 which is the valley bottom between the first unit optical shapes 121) is It is h1.
For ease of understanding, FIG. 2 shows an example in which the arrangement pitch P1 and the angles θ1 and θ2 of the first unit optical shape 121 are constant in the arrangement direction of the first unit optical shape 121. However, in the first unit optical shape 121 of the present embodiment, the arrangement pitch P1 is actually constant, but gradually as the angle θ1 moves away from the point C1 which becomes the Fresnel center in the arrangement direction of the first unit optical shape 121. It's getting bigger.
The angles θ1, θ2, the arrangement pitch P1, etc. are the projection angle of the image light from the image source LS1 (the angle of incidence of the image light on the first screen unit 10), the size of the pixels of the image source, and the first. It may be appropriately set according to the size of the display area (screen size) of the screen unit 10, the refractive index of each layer of the first screen unit 10, and the like. For example, the arrangement pitch P1 may change along the arrangement direction of the first unit optical shape 121, and the angles θ1 and θ2 may change.

The first optical shape layer 12 is formed of an ultraviolet curable resin such as urethane acrylate-based, polyester acrylate-based, epoxy acrylate-based, polyether acrylate-based, polythiol-based, and butadiene acrylate-based, which have high light transmittance.
In the present embodiment, as the resin constituting the first optical shape layer 12, an ultraviolet curable resin will be described as an example, but the present invention is not limited to this, and for example, other ionizing radiation such as an electron beam curable resin is used. It may be formed of a curable resin.

The first reflective layer 13 is a semi-transmissive reflective layer that reflects a part of the incident light and transmits the other incident light, and is a so-called half mirror. The first reflective layer 13 of the present embodiment is formed on the first unit optical shape 121 (on the first slope 121a and the second slope 121b).
As described above, the first slope 121a and the second slope 121b are formed with fine and irregular uneven shapes, and the first reflective layer 13 is formed following the fine and irregular uneven shapes. The film is formed in a state where the uneven shape is maintained. Therefore, the surface of the first reflective layer 13 on the first optical shape layer 12 side (image source side) and the surface on the first resin layer 14 side (back surface side) are rough surfaces having fine and irregular uneven shapes. ing.
The first reflective layer 13 diffuses and reflects a part of the incident light due to a fine and irregular uneven shape, and transmits the other incident light without diffusing it.

In the first reflective layer 13, a plurality of dielectric films having a high refractive index (hereinafter referred to as a high refractive index dielectric film) and a plurality of dielectric films having a low refractive index (hereinafter referred to as a low refractive index dielectric film) are alternately laminated. It is formed by a dielectric multilayer film formed by the process.
The high refractive index dielectric film is formed of, for example, TIO ₂ (titanium dioxide), Nb ₂ O ₅ (niobium pentoxide), Ta ₂ O ₅ (tantalum pentoxide), or the like. The refractive index of the high refractive index dielectric film is about 2.0 to 2.6.
The low refractive index dielectric film is formed of, for example, SiO ₂ (silicon dioxide), MgF ₂ (magnesium fluoride), or the like. The refractive index of the low refractive index dielectric film is about 1.3 to 1.5.
The film thickness of the high-refractive index dielectric film and the low-refractive index dielectric film is about 5 to 100 nm, and these are formed by alternately laminating about 2 to 10 layers, and the total thickness of the dielectric multilayer film is , 10 to 1000 nm.

The first reflective layer 13 has a reflectance of about 5 to 45% and a transmittance of about 55 to 85% with respect to light having a wavelength range of 400 to 800 nm.
The first reflective layer 13 formed of the dielectric multilayer film has higher transparency than the reflective layer formed of a metal vapor deposition film such as aluminum, and has a small light absorption loss. High reflectance can be achieved.

The first reflective layer 13 of the present embodiment is formed by laminating a plurality of high refractive index dielectric films formed of a metal oxide film such as TiO ₂ (titanium dioxide) and a plurality of low refractive index dielectric films formed of SiO _2. Is formed.
The first reflective layer 13 has a predetermined thickness by depositing or sputtering the above-mentioned dielectric multilayer film on the first unit optical shape 121 (on the first slope 121a and the second slope 121b). Is formed by.
The first reflective layer 13 is not limited to this, and for example, a metal having high light reflectivity such as aluminum, silver, and nickel is vapor-deposited, a metal having high light reflectivity is sputtered, or a metal foil is transferred. It may be formed by such as.

The reflectance of the first reflective layer 13 is constant or substantially constant in a region where the second screen portion 20 is not laminated (a region other than the laminated region W1). However, in the laminated region W1, the reflectance of the first reflective layer 13 decreases continuously or stepwise toward the right side of the screen in the left-right direction (second screen portion 20 side), and the rightmost end portion in the left-right direction of the screen. Is the smallest value (for example, 0%).

The first resin layer 14 is a light-transmitting layer provided on the back surface side (−Z side) of the first optical shape layer 12 and the first reflective layer 13.
The first resin layer 14 is formed so as to fill the valley portion of the unevenness due to the first unit optical shape 121, and the surface on the back surface side (−Z side) of the first optical shape layer 12 and the first reflective layer 13 is formed. It is flat. Therefore, the surface of the first resin layer 14 on the image source side (+ Z side) is formed by arranging a plurality of substantially inverted shapes of the first unit optical shape 121 of the first optical shape layer 12.
By providing such a first resin layer 14, the first reflective layer 13 can be protected. Further, by providing the first resin layer 14 on the first screen portion 10, the first protective layer 15, the transparent layer 801 and the second screen portion 20 can be easily laminated.

It is desirable that the refractive index of the first resin layer 14 is equal to or substantially equal to the refractive index of the first optical shape layer 12 (the difference in refractive index is small enough to be regarded as equal). Further, the first resin layer 14 is preferably formed by using the same ultraviolet curable resin as the first optical shape layer 12, but may be formed by a different material.
The first resin layer 14 of the present embodiment is formed of the same material (ultraviolet curable resin) as the first optical shape layer 12, and its refractive index is equal to the refractive index of the first optical shape layer 12.

The first protective layer 15 is a light-transmitting layer formed on the back surface side (−Z side) of the first resin layer 14, and has a function of protecting the back surface side of the first screen portion 10 (screen 100). have.
The first protective layer 15 is formed of a sheet-like member made of resin having high light transmission. As the first protective layer 15, for example, a sheet-like member formed by using the same material as the first base material layer 11 may be used.

Next, the second screen unit 20 will be described. As described above, the second screen unit 20 is a screen having the same shape as the first screen unit 10. Therefore, duplicate description will be omitted as appropriate for the portion having the same function as that of the first screen unit 10.
The second base material layer 21 is a layer corresponding to the first base material layer 11 of the first screen portion 10. In the present embodiment, the second base material layer 21 uses the same sheet-like member as the first base material layer 11.
The second optical shape layer 22 is a layer corresponding to the first optical shape layer 12 of the first screen unit 10.
As shown in FIG. 3B, the second optical shape layer 22 has a screen 100 having a second unit optical shape (unit lens) 221 which is a partial shape (arc shape) of a perfect circle on the back surface thereof. It has a circular Fresnel lens shape with an offset structure in which a plurality of points C2 located outside the screen (outside the display area of the second screen unit 20) are arranged concentrically around the point C2.
In the present embodiment, as shown in FIG. 3B, this point C2 is located at the center of the display area of the second screen unit 20 in the left-right direction and below the outside of the display area, and the screen 100 is in front of the screen 100. When viewed from the direction (Z direction), the points C2 and A2 are located on the same straight line parallel to the Y direction.

The second unit optical shape 221 corresponds to the above-mentioned first unit optical shape 121, and as shown in FIG. 2B, the direction orthogonal to the screen surface (Z direction) and the arrangement direction of the second unit optical shape 221. The cross-sectional shape in the cross section parallel to is a substantially triangular shape that is convex toward the back surface.
The second unit optical shape 221 (unit lens) has a first slope (lens surface) 221a and a second slope (non-lens surface) 221b.
The first slope 221a and the second slope 221b are rough surfaces having a fine and irregular uneven shape like the first slope 121a and the second slope 121b of the first unit optical shape 121.

The angle formed by the first slope 221a with the surface parallel to the screen surface is θ3. The angle formed by the second slope 221b with the plane parallel to the screen plane is θ4. The angles θ3 and θ4 satisfy the relationship of θ4> θ3.
The arrangement pitch of the second unit optical shape 221 is P2, and the height of the second unit optical shape 221 (the dimension from the apex t2 in the thickness direction to the point v2 which is the valley bottom between the second unit optical shapes 221) is It is h2.

The angles θ3 and θ4, the arrangement pitch P2, and the height h2 of the second unit optical shape 221 all correspond to the angles θ1 and θ2, the arrangement pitch P1, and the height h1 of the first unit optical shape 121.
For ease of understanding, FIG. 2 shows an example in which the arrangement pitch P2 and the angles θ3 and θ4 of the second unit optical shape 221 are constant in the arrangement direction of the second unit optical shape 221. However, in the second unit optical shape 221 of the present embodiment, the arrangement pitch P2 is actually constant, but gradually as the angle θ3 moves away from the point C2 that becomes the Fresnel center in the arrangement direction of the second unit optical shape 221. It's getting bigger.

The angles θ3, θ4, the arrangement pitch P2, etc. are the same as the above-mentioned angles θ1, θ2 and the arrangement pitch P1, the projection angle of the image light from the image source LS2 (the angle of incidence of the image light on the second screen unit 20) and , The size of the pixel of the image source, the screen size of the screen 100, the refractive index of each layer, and the like may be appropriately set. For example, the arrangement pitch P2 may change along the arrangement direction of the second unit optical shape 221, and the angles θ3 and θ4 may change.

In the present embodiment, as described above, the first screen portion 10 and the second screen portion 20 have the same shape. Therefore, the arrangement pitch P1 of the first unit optical shape 121 and the arrangement pitch P2 of the second unit optical shape 221 are equal (P1 = P2). Further, the angles θ1 and θ2 of the first unit optical shape 121 at the position which is the distance r from the point C1 which is the Frenel center in the first screen unit 10 and the distance r from the point C2 in the second screen unit 20 are the same. The angles θ3 and θ4 of the second unit optical shape 221 at the position are θ1 = θ3 and θ2 = θ4.

The second reflective layer 23 is a layer corresponding to the first reflective layer 13 of the first screen portion 10, and is formed of a dielectric multilayer film like the first reflective layer 13.
Further, the reflectance of the second reflective layer 23 is constant or substantially constant in a region where the first screen portion 10 is not laminated (a region other than the laminated region). However, in the laminated region W1, the reflectance of the second reflective layer 23 decreases continuously or stepwise toward the left side (first screen portion 10 side) in the left-right direction of the screen, and is the leftmost end in the left-right direction of the screen. In the section, it is the smallest value (for example, 0%).

The second resin layer 24 is a layer corresponding to the first resin layer 14 of the first screen portion 10 described above. The second resin layer 24 is made of the same material as the first resin layer 14.
The second protective layer 25 is a layer corresponding to the first protective layer 15 of the first screen portion 10. The second protective layer 25 is made of the same material as the first protective layer 15.

As described above, the screen 100 of the present embodiment does not include a light diffusion layer containing a diffusing material such as diffusing particles having a function of diffusing light. Therefore, a part of the light incident on the screen 100 is diffusely reflected by the fine and irregular uneven shape of the first reflecting layer 13 and the second reflecting layer 23, but at least a part of the other incident light is diffusely reflected. It is transparent without being diffused.

The screen 100 of the present embodiment is manufactured by, for example, the following manufacturing method.
First, the first screen portion 10 and the second screen portion 20 are manufactured. Here, the first screen unit 10 will be described as an example.
A first base material layer 11 is prepared, and on one surface thereof, a molding mold for shaping the first unit optical shape 121 is laminated with an ultraviolet curable resin filled, and the ultraviolet curable resin is irradiated with ultraviolet rays. The first optical shape layer 12 is formed by a UV forming method for curing. At this time, fine and irregular uneven shapes are formed on the surfaces forming the first slope 121a and the second slope 121b of the molding die that shape the first unit optical shape 121.

This fine and irregular uneven shape can be formed by performing surface processing a plurality of times on the surfaces forming the first slope 121a and the second slope 121b of the molding die. This surface processing includes, for example, plating processing, etching processing, blasting processing, and the like. Further, the surface processing may be performed a plurality of times by changing various conditions and the like.
After the first optical shape layer 12 is formed on one surface of the first base material layer 11, the first reflective layer 13 is formed by depositing a dielectric multilayer film on the first slope 121a and the second slope 121b. ..

At this time, the first reflective layer 13 in the region corresponding to the laminated region W1 is formed in, for example, a dot shape or a striped shape by a jig such as a mask capable of masking a predetermined shape or the like, and the laminated region W1 It is formed so that its diameter and width become smaller toward the end of the inner screen portion. As a result, the area ratio occupied by the region where the first reflective layer 13 is formed per unit area becomes smaller toward the end portion in the laminated region W1 (the region where the first reflective layer 13 is not formed per unit area). The area ratio occupied by is large).
When the first reflective layer 13 is formed of a dielectric multilayer film, the unit is increased toward the end in the laminated region W1 by reducing the region where the first reflective layer 13 is formed in this way. The amount of light reflected by the first reflective layer 13 per area is reduced, and as a result, the reflectance of light as the first reflective layer 13 is reduced.
When the first reflective layer 13 is formed by depositing a metal such as aluminum, the thickness of the first reflective layer 13 is adjusted by using, for example, a gradation mask in addition to the above method. By doing so, it is possible to reduce the reflectance of the first reflective layer 13 in the laminated region W1.

Next, the ultraviolet curable resin is applied from above the first reflective layer 13 so as to fill the uneven valleys of the first unit optical shape 121 so as to be flat, and the first protective layer 15 is laminated. The ultraviolet curable resin is cured by irradiating with ultraviolet rays to integrally form the first resin layer 14 and the first protective layer 15. As a result, the first screen portion 10 is formed.
The second screen portion 20 is also manufactured by the same manufacturing method.
The first base material layer 11, the second base material layer 21, the first protective layer 15, and the second protective layer 25 may be in the form of a single leaf or in the form of a web.

Next, for example, the first screen portion 10 and the transparent layer 802 are arranged along the left-right direction of the screen, and temporarily fixed with a peelable tape or the like for temporary fixing in a state where the ends are in contact with each other. Next, a light-transmitting pressure-sensitive adhesive or the like is applied to the back surface side (−Z side) of the first screen portion 10 and the transparent layer 802 with an equal thickness to form the bonding layer 101.
From above the joint layer 101, the second screen portion 20 and the transparent layer 801 temporarily fixed in a state where the ends are in contact with each other are placed in the laminated region W1 in the same manner as the first screen portion 10 and the transparent layer 802 described above. The 1 screen portion 10 and the 2nd screen portion 20 are joined so as to be laminated in the thickness direction. After that, the screen 100 is formed by cutting into a predetermined size or the like.

As a method of forming fine and irregular uneven shapes on the surfaces of the first reflective layer 13 and the second reflective layer 23, for example, diffuse particles or the like are coated on the first slopes 121a, 221a and the second slopes 121b, 221b. After each reflective layer is formed from the top of the ridge, or the first optical shape layer 12 and the second optical shape layer 22 are formed, the first slopes 121a, 221a and the second slopes 121b, 221b are blasted once. Conventionally, a method of forming each reflective layer from above is known.
However, in such a manufacturing method, the diffusion characteristics and quality of the first screen unit 10 and the second screen unit 20 may differ, and the diffusion characteristics and quality of the individual screens 100 may vary greatly. , Stable manufacturing cannot be performed.
On the other hand, as described above, the fine and irregular uneven shapes of the first slopes 121a and 221a and the second slopes 121b and 221b of the first unit optical shape 121 and the second unit optical shape 221 are formed by the molding die. By using a manufacturing method of shaping and forming each reflective layer on it, it is possible to reduce the variation in quality in each screen portion, and even when a large number of screens 100 are manufactured, the variation in quality is small and stable. It has the advantage that it can be manufactured.

FIG. 4 is a diagram for explaining the state of image light and external light in the screen vertical direction (Y direction) of the screen 100 of the first embodiment. In FIG. 4, in order to facilitate understanding, the first screen portion 10 is illustrated as an example, and the first unit optical shape 121 passes through the point A1 in the arrangement direction (Y direction) and the screen thickness direction (Z direction). ) Is a part of the cross section parallel to). Further, in FIG. 4, in order to facilitate understanding, it is shown that there is no difference in refractive index at the interface of each layer in the screen 100.
Of the image light L11 projected from the image source LS1 located below the screen 100, a part of the image light L12 is on the surface of the screen 100 (the surface of the first base material layer 11) when it is incident on the screen 100. It reflects and goes upward on the image source side of the screen 100. This image light L12 does not reach the observer O1.

Of the image light L11, a part of the image light L13 incident on the screen 100 is incident on the first slope 121a of the first unit optical shape 121, diffusely reflected by the first reflection layer 13, and emitted to the observer O1 side. To do.
Of the video light incident on the first slope 121a, a part of the video light L14 that was not reflected passes through the first reflective layer 13 and faces the back side (−Z side) of the screen 100 and is upward from the screen 100 on the back side. Exit to. The image light L14 does not reach the observer O2 located in the front direction on the back side of the screen 100.

In the present embodiment, the image source LS1 is located below the screen 100, the image light L11 is projected from below the screen 100, and the angle θ2 formed by the second slope 121b with the surface parallel to the screen surface (FIG. 2). (See) is larger than the incident angle of the image light at each point in the vertical direction of the screen of the screen 100, so that the image light does not directly enter the second slope 121b, and the second slope 121b reflects the image light. Has little effect.

Next, light from the outside world such as sunlight (hereinafter referred to as external light) other than the image light incident on the screen 100 from above the back surface side (−Z side) or the image source side (+ Z side) will be described.
As shown in FIG. 4, of the external light G1 incident on the screen 100 from above the image source side, a part of the external light G2 is reflected by the surface of the screen 100 or the like and heads toward the lower side of the image source side of the screen 100. .. Further, a part of the external light G3 is reflected by the first reflective layer 13, and a part of the external light is totally reflected on the surface of the screen 100 on the image source side (+ Z side) and gradually attenuates in the screen 100 downward. .. Further, some external light G3 is emitted from the screen 100 downward on the image source side depending on the angle of incidence on the surface of the screen 100.
A part of the external light G4 transmitted through the first reflective layer 13 is emitted from the screen 100 downward on the back side. The external light G4 does not reach the observer O2 located in the front direction on the back side of the screen 100.

Of the external light G5 incident on the screen 100 from above the back side, some of the external light G6 is reflected by the surface of the screen 100 (here, the back surface of the transparent layer 801), and the lower side of the back side of the screen 100. Head to. Further, a part of the external light G7 is reflected by the first reflective layer 13 and is emitted from the screen 100 to the upper side on the back side or the like. The external light G7 does not reach the observer O2 located in the front direction on the back side of the screen 100.
A part of the external light G8 transmitted through the first reflective layer 13 goes downward inside the screen 100, is gradually attenuated, or is emitted downward toward the image source side of the screen 100. The external light G8 does not reach the observer O1 located in the front direction of the screen 100 on the image source side.

Further, the other external lights G9 and G10 incident on the screen 100 at a small incident angle pass through the first reflective layer and are emitted to the back surface side and the image source side, respectively. Since the screen 100 does not contain a light diffusion layer or the like containing diffuse particles that diffuse light, the external light G9 and G10 transmitted through the screen 100 are not diffused.
Therefore, when observing the scenery on the other side of the screen 100 through the screen 100, the scenery on the other side of the screen 100 can be observed with high transparency without blurring or bleeding white.

In the conventional semi-transmissive reflective screen provided with a light diffusing layer containing diffusing particles, the image light is diffused twice before and after the reflection by the reflective layer, so that a good viewing angle can be obtained while the image is displayed. There is a problem that the resolution is lowered. In addition, since the diffused particles also diffuse the external light, the scenery on the other side of the screen is observed to be blurred or bleeding white, and the transparency is lowered.

However, in the screen 100 of the present embodiment, the first reflective layer 13 and the second reflective layer 23 have fine and irregular uneven shapes on the surface, and are reflected by the first reflective layer 13 and the second reflective layer 23. Only the light that is transmitted is diffused, and the transmitted light is not diffused. Therefore, the screen 100 of the present embodiment can display an image having a good viewing angle and resolution, and the scenery on the other side of the screen 100 is not blurred or blurred, and is well visible to the observer O1. And high transparency can be achieved.
Further, in the screen 100 of the present embodiment, the observer O1 can partially see the scenery on the other side (back side) of the screen 100 even when the image light is projected on the screen 100.
Further, in the screen 100 of the present embodiment, the observer O2 located on the back side (−Z side) has a high view of the image source side (+ Z side) through the screen 100 regardless of the presence or absence of projection of image light. It is transparent and can be visually recognized well.

Next, the laminated region W1 of the screen 100 will be described.
FIG. 5 is a diagram illustrating the reflectances of the first reflective layer 13 and the second reflective layer 23 of the first embodiment. FIG. 5 schematically shows changes in the reflectances of the first reflective layer 13 and the second reflective layer 23 in the left-right direction of the screen.
FIG. 6 is a diagram for explaining the reflected light (video light) from the screen 100 of the first embodiment. FIG. 6 shows a state in which the image light reflected by each screen portion and emitted from the image source side (+ Z side) is viewed from the upper side (+ Y side) in the vertical direction of the screen.

As shown in FIG. 5, in the present embodiment, the reflectance of the first reflective layer 13 is constant in regions other than the laminated region W1, and the first reflection at the point A1 at the center of the screen of the first screen unit 10. The reflectance of layer 13 is, for example, 20%. Similarly, in regions other than the laminated region W1, the reflectance of the second reflective layer 23 is constant, and the reflectance of the second reflective layer 23 at the point A2 at the center of the screen of the second screen unit 20 is determined. For example, 20%.
In the laminated region W1, the reflectance of the first reflective layer 13 is continuously reduced toward the right end (+ X side) of the first screen portion 10, and at the rightmost end of the first screen portion 10, for example, reflection. The rate is 0%. Further, the reflectance of the second reflective layer 23 is continuously reduced toward the left end (−X side) of the second screen portion 20, and at the leftmost end of the second screen portion 20, for example, the reflectance is 0. It is%.
Therefore, in the laminated region W1, the sum of the reflectance of the first reflective layer 13 and the reflectance of the second reflective layer 23 is about 20%.

As shown in FIG. 6, the image light incident on each screen unit is reflected by each reflection layer and emitted from each screen unit toward the focusing point on the image source side (+ Z side). In the present embodiment, the condensing point of each screen portion is infinity.
Here, in the laminated region W1, both the image light L1 from the first image source LS1 and the image light L2 from the second image source LS2 are incident on each screen portion.
As described above, in the present embodiment, the screen 100 has a laminated region W1, and in this laminated region W1, the reflectance of the first reflective layer 13 is the right end (+ X side) of the first screen portion 10. The reflectance of the second reflective layer 23 becomes smaller toward the left end (−X side) of the second screen portion 20.

Therefore, according to the present embodiment, there is no seam (non-display portion, portion where the image light is not reflected) between the screen portions, which is simply generated in the screen in which the screen portions are arranged. Further, according to the present embodiment, the image displayed in the laminated area W1 is smoothly and continuously displayed with the image displayed by the areas of both screen portions adjacent to the laminated area W1 and is displayed in the front direction of the screen 100. It is difficult for the located observer O1 to visually recognize the joints of each image.
Therefore, according to the present embodiment, the observer O1 located in the front direction of the screen 100 can display the images displayed by each screen unit as if they are smoothly continuous, and a good image on a large screen can be displayed. The screen 100 and the image display device 1 that can be displayed and have transparency can be used.

In the present embodiment, the area of the laminated region W1 may be such that the ratio of the area of the display area of the first screen unit 10 (or the area of the display area of the second screen unit 20) is about 50% or less. It is preferable from the viewpoint of eliminating the seams (non-display parts) of the image and the screen unit and displaying a good image on a large screen, but depending on the usage environment and the desired screen size of the screen 100, the first screen unit 10 The ratio of the area of the laminated region W1 to the area of the display area (or the area of the display area of the second screen unit 20) may be appropriately set.

(Second Embodiment)
FIG. 7 is a diagram illustrating the image display device 2 of the second embodiment. FIG. 7A is a view of the image display device 2 viewed from the front side of the image source side, and FIG. 7B is a view of the image display device 2 viewed from above in the vertical direction.
FIG. 8 is a diagram illustrating a third screen unit 30 of the second embodiment. In FIG. 8A, the screen passes through a point A3 (see FIG. 7) that is the center of the screen (geometric center of the screen) on the image source side (+ Z side) of the third screen unit 30, and is in the vertical direction (Y direction) of the screen. A part of the cross section parallel to the screen surface and perpendicular to the screen surface (parallel to the Z direction) is shown enlarged. FIG. 8B shows a view of the third optical shape layer 32 of the third screen portion 30 as viewed from the back side.
The video display device 2 of the second embodiment is different from the video display device 1 of the first embodiment in that the combination of the screen unit and the corresponding video source is three sets, but other than that, the first It has the same shape as the image display device 1 of the first embodiment. Therefore, the same reference numerals or the same reference numerals are given to the parts that perform the same functions as those of the first embodiment described above, and duplicate description will be omitted as appropriate.

The video display device 2 of the second embodiment has a screen 200 and a video source (first video source LS1, second video source LS2, third video source LS3) that projects video light onto each screen portion of the screen 200. I have.
The screen 200 includes a first screen unit 10, a second screen unit 20, a third screen unit 30, and transparent layers 801,802,803. The first screen unit 10, the second screen unit 20, and the third screen unit 30 are arranged in the left-right direction of the screen.

The third screen portion 30 is located closer to the image source side (+ Z side) than the second screen portion 20, and the left end portion in the left-right direction of the screen is laminated with the right end portion in the left-right direction of the screen in the thickness direction of the second screen portion 20. And are integrally joined via the joining layer 101. The region where the second screen portion 20 and the third screen portion 30 are laminated is the laminated region W2. Further, in the third screen portion 30, the transparent layer 803 is integrally laminated and joined to the back surface side (−Z side) via the bonding layer 101.
The third screen portion 30 is a screen having the same shape as the first screen portion 10 and the second screen portion 20, and has a third base material layer 31, a third optical shape layer 32, a third reflective layer 33, and a third resin layer. 34, a third protective layer 35 is provided. The third base material layer 31 corresponds to the first base material layer 11, the third optical shape layer 32 corresponds to the first optical shape layer 12, and the third reflective layer 33 corresponds to the first reflective layer 13. The third resin layer 34 corresponds to the first resin layer 14, and the third protective layer 35 corresponds to the first protective layer 15.

Further, the third optical shape layer 32 has a circular Fresnel lens shape having an offset structure with the point C3 as the Fresnel center on the back surface side, and is a point at the center of the display area (screen) of the point C3 and the third screen portion 30. A3 is located on a straight line parallel to the Y direction.
The third unit optical shape 321 has the same shape as the first unit optical shape 121 of the first screen unit 10, and has a first slope 321a and a second slope 321b.
The angles θ5 and θ6 formed by the first slope 321a and the second slope 321b with the plane parallel to the screen surface in the cross section shown in FIG. 8 are equal to the angles θ1 and θ2 of the first unit optical shape 121. Further, the height h3 of the third unit optical shape 321 (the dimension from the apex t3 in the thickness direction to the point v3 which is the valley bottom between the third unit optical shapes 321) and the arrangement pitch P3 are the heights of the first unit optical shape 121. H1, equal to the array pitch P1.

FIG. 9 is a diagram illustrating the reflectance of each reflective layer of the second embodiment. FIG. 9 schematically shows changes in the reflectances of the first reflective layer 13, the second reflective layer 23, and the third reflective layer 33 in the left-right direction of the screen.
The reflectance of the second reflective layer 23 of the second screen portion 20 is constant or substantially constant in regions other than the laminated regions W1 and W2, and in the laminated regions W1 and W2, as it goes toward the left and right edges in the left-right direction of the screen. The reflectance is continuously or gradually decreased, and the reflectance is the smallest value at the leftmost and rightmost ends in the left-right direction of the screen.

In the present embodiment, the reflectance of the second reflective layer 23 at the point A2 located in a region other than the laminated regions W1 and W2 is, for example, 20%.
Further, in the laminated region W1 with the first screen portion 10, the reflectance of the second reflective layer 23 is continuously reduced toward the left side (−X side) in the left-right direction of the screen, and the reflectance at the leftmost end is increased. For example, it is 0%. Similarly, in the laminated region W2 with the third screen, the reflectance of the second reflective layer 23 continuously decreases toward the right side (+ X side) in the left-right direction of the screen, and the reflectance at the rightmost end becomes, for example. It is 0%.

Further, in the present embodiment, the third reflective layer 33 of the third screen portion 30 has a constant or substantially constant reflectance in a region other than the laminated region W2, for example, the center of the display region of the third screen portion 30. The reflectance of the third reflective layer 33 at the point A3 is, for example, 20%.
Then, in the laminated region W2 with the second screen portion 20, the reflectance of the third reflective layer 33 becomes continuously smaller toward the left side (−X side) in the left-right direction of the screen, and the reflectance at the leftmost end is increased. For example, it is 0%.

From the above, also in the present embodiment, similarly to the first embodiment described above, the screen 200 and the image display device 2 capable of displaying a good image on a large screen without conspicuous seams can be obtained.
In the present embodiment, the image display device 2 has been described with an example of including a screen 200 having three screen units and three image sources corresponding to each screen unit, but the present invention is not limited to this. The number of copies may be four or more, and the number of video sources may be adjusted to match the number of corresponding screen sections.

(Transformed form)
Not limited to each of the embodiments described above, various modifications and changes are possible, and these are also within the scope of the present invention.
(1) In each embodiment, examples have been described in which the screen portions included in the screens 100 and 200 all have the same shape, but the present invention is not limited to this, and the shape and the like of each screen portion may be different. For example, each screen portion may have different dimensions in the horizontal direction of the screen, or each optical design layer has a different optical design of the Fresnel lens shape (for example, a surface in which each first slope is parallel to the screen surface). The angle between the two may be different, or the arrangement pitch may be different).

(2) In each embodiment, the screens 100 and 200 may not include the transparent layers 801, 802, 803. Even if the screens 100 and 200 do not have a transparent layer, they can be attached to a support plate or the like (not shown) by adjusting the thickness or the like of the bonding layer 101.
Further, in each embodiment, the transparent layers 801 to 803 may be in a form having sufficient rigidity to maintain the flatness of the screens of the screens 100 and 200. With such a form, a support plate, a frame member, or the like (not shown) that is joined to the screen becomes unnecessary.
Further, in each embodiment, each screen portion of the screens 100 and 200 may not have a base material layer or a protective layer on the side to which the transparent layers 801-803 are bonded. For example, in the first embodiment, the first protective layer 15 of the first screen unit 10 and the second base material layer 21 of the second screen unit 20 may not be provided.
Further, in each embodiment, each screen portion of the screens 100 and 200 is formed of each base material layer and each protective layer when each optical shape layer and each resin layer have sufficient thickness and rigidity. It may be in a form that does not include all or one of each base material or each protective layer.

(3) In the second embodiment, the area of the display area of the second screen unit 20 is larger than the sum of the areas of the laminated areas W1 and W2, but the present invention is not limited to this, and the area of the second screen unit 20 is not limited to this. The area of the display area may be equal to the sum of the areas of the laminated areas W1 and W2.
Further, in the second embodiment, for example, the sum of the areas of the laminated areas W1 and W2 may be larger than the area of the display area of the second screen unit 20. At this time, the laminated region W1 and the laminated region W2 are partially laminated in the thickness direction. With such a form, the images displayed by each screen unit can be connected more smoothly.

(4) In each embodiment, an example is shown in which the reflectance of the reflective layer at the end of each screen portion in each laminated region is 0%, but the present invention is not limited to this, and at least the end portion in the laminated region is shown. If the reflectance becomes smaller toward the direction of the screen and becomes the smallest reflectance at the end of the screen portion in the laminated region, the value is not particularly limited.

(5) In each embodiment, a hard coat layer may be provided on the image source side (+ Z side) of the screens 100 and 200 for the purpose of preventing scratches. The hard coat layer can be formed, for example, by applying an ultraviolet curable resin having a hard coat function (for example, urethane acrylate or the like) to the surface of the screens 100 and 200 on the image source side.
Further, not limited to the hard coat layer, a layer having appropriate necessary functions such as an antireflection function, an ultraviolet absorption function, an antifouling function, an antistatic function, etc., depending on the usage environment and purpose of use of the screens 100 and 200. May be provided by selecting one or more. Further, a touch panel layer or the like may be provided on the image source side (+ Z side) of the screens 100 and 200.
For example, when an antireflection layer is provided on the surface of the screens 100 and 200 on the image source side, the reflection of the image light when it is incident on the screen is suppressed, the amount of incident light is increased, and the reflection is reflected by each reflection layer. It is possible to prevent the image from being partially leaked to the observer O2 on the back side due to a part of the light being reflected on the surface of the screen on the image source side and emitted from the back side.

(6) In the first embodiment, the first image source LS1 and the second image source LS2 are arranged on, for example, diagonally lower side of the screen 100, and the screen 100 (first screen unit 10, second screen unit 20). On the other hand, the image light may be projected from the oblique direction light in the left-right direction of the screen. At this time, the positions of the points C1 and C2 serving as the Fresnel center are shifted according to the positions of the first video source LS1 and the second video source LS2. With such a form, the degree of freedom in the position of the image source and the like is improved. The same applies to the second embodiment.

(7) In each embodiment, each of the first slopes and the second slopes of the first unit optical shape 121, the second unit optical shape 221 and the third unit optical shape 321 is, for example, a combination of a curved surface and a flat surface. It may be in the form of a bent surface.
Further, the first unit optical shape 121, the second unit optical shape 221 and the third unit optical shape 321 may be polygonal shapes formed by a plurality of three or more surfaces.
Further, the first reflective layer 13 may be formed on at least a part of the first slope 121a. This also applies to the second reflective layer 23 and the third reflective layer 33.
Further, the first unit optical shape 121, the second unit optical shape 221 and the third unit optical shape 321 may be in a form in which only the first slope is a rough surface having a fine and irregular uneven shape.

(8) In each embodiment, the screens 100 and 200 show an example in which the screen (display area) has a rectangular shape, but the present invention is not limited to this, and for example, other quadrangular shapes such as a square or a parallelogram or many. It may be rectangular, circular, oval, oval or the like.

(9) In each embodiment, the example in which the screen portions are arranged along the left-right direction of the screen is shown, but the present invention is not limited to this, and for example, the screen portions may be arranged in the vertical direction of the screen. In this case, the video sources are also arranged in the vertical direction of the screen along the arrangement direction of the screen unit.

(10) In each embodiment, the reflective layer of each screen portion has the highest reflectance at the point at the center of the screen, and the reflectance gradually decreases toward the edge of the screen. May be good.

(11) In each embodiment, the screens 100 and 200 are colored with a dark colorant such as black or gray, and have a light absorption layer (not shown) having a light absorption property for absorbing a part of the incident light. You may have it. The light absorption layer may be located on the image source side (+ Z side) of each reflection layer, or may be located on the back surface side (−Z side) of each reflection layer.
By providing the light absorbing layers on the screens 100 and 200, it is possible to absorb the stray light traveling in the screen while totally reflecting at the interface between the screen and the air due to the external light incident on the screen, and the contrast of the image is lowered due to the stray light. Etc. can be suppressed.

Further, when the light absorption layer is located closer to the image source side than each reflection layer, it is possible to reduce the black brightness of the image and absorb the external light incident from the image source side to improve the contrast of the image. it can. Further, when the light absorption layer is located on the back side of each reflection layer, it is possible to absorb the external light incident from the back side and improve the contrast of the image.
The above-mentioned light absorbing layer may be a transparent layer that does not contain a coloring material and has a light absorbing action.

(12) In each embodiment, each image source may project, for example, image light having a polarization component of a P wave.
The position and angle of each image source are set so that the image light is projected onto each screen portion at an incident angle φ. This incident angle φ is (φb-10) ° or more 85 when the incident angle (Brewster angle) at which the reflectance of the image light (P wave) projected on each screen is zero is φb (°). It is set in the range below °. For example, when the incident angle φb at which the reflectance of the video light projected on each screen portion becomes zero is 60 °, the incident angle φ of the video light is set in the range of 50 to 85 °.

In this way, by using a video source that projects video light having a polarization component of P waves, specular reflection on the surfaces of the screens 100 and 200 can be suppressed even when the incident angle φ to each screen portion is large. This makes it possible to increase the degree of freedom in designing the projection system, such as the installation position of the image source. Further, by using such an image source, it is possible to reduce the reflection of the image light on the incident surface when it is incident on each screen portion or the transparent layer, and it is possible to improve the brightness and sharpness of the image.
The angle φb (Brewster's angle) differs depending on the surface of each screen portion on which the image light is projected or the material of the transparent layer.
Further, in such a form, as each base material layer or transparent layer constituting the image source side surfaces of the screens 100 and 200, for example, a sheet-shaped member made of TAC is suitable.

Although the present embodiment and the modified form can be used in combination as appropriate, detailed description thereof will be omitted. Moreover, the present invention is not limited to each of the embodiments described above.

1 Image display device 100, 200 screens 10, 20, 30 1st screen unit, 2nd screen unit, 3rd screen unit 11,21,31 1st base material layer, 2nd base material layer, 3rd base material layer 12 , 22, 32 1st optical shape layer, 2nd optical shape layer, 3rd optical shape layer 121,221,321 1st unit optical shape, 2nd unit optical shape, 3rd unit optical shape 13, 23, 33 1st Reflective layer, 2nd reflective layer, 3rd reflective layer 14, 24, 34 1st resin layer, 2nd resin layer, 3rd resin layer 15, 25, 35 1st protective layer, 2nd protective layer, 3rd protective layer 801,802,803 Transparent layer LS1, LS2, LS3 1st image source, 2nd image source, 3rd image source

Claims (10)

A reflective screen formed by reflecting a part of the image light projected from a plurality of image sources to display an image and arranging a plurality of screen portions that transmit a part of the image light in at least one direction. There,
Each of the plurality of screen units
An optical shape layer that has light transmission and has multiple unit optical shapes arranged on the back surface.
It is formed on at least a part of the unit optical shape, and the surface on the unit optical shape side is a rough surface having an irregular uneven shape, reflects a part of the incident light, and at least the other incident light. A reflective layer that has the function of transmitting a part,
With
The screen portion includes a laminated region in which adjacent screen portions are integrally laminated in the thickness direction.
The reflectance of the reflective layer decreases continuously or stepwise toward the end of the screen portion, at least in the laminated region.
A reflective screen featuring. In the reflective screen according to claim 1,
The reflectance of the reflective layer at the end of the laminated region of the screen portion is 0%.
A reflective screen featuring. In the reflective screen according to claim 1 or 2.
The optical shape layer has a circular Fresnel lens shape in which a plurality of the unit optical shapes are concentrically arranged on the back surface side.
A reflective screen featuring. In the reflective screen according to claim 3,
The circular Fresnel lens shape is such that the point serving as the Fresnel center is located outside the display area of the screen portion.
A reflective screen featuring. In the reflective screen according to any one of claims 1 to 4.
A plurality of the screen portions having the same shape are arranged and formed.
A reflective screen featuring. In the reflective screen according to any one of claims 1 to 5.
The screen portion is provided with a light absorption layer having a function of absorbing light.
A reflective screen featuring. In the reflective screen according to any one of claims 1 to 6.
The reflective layer is formed of a dielectric multilayer film.
A reflective screen featuring. In the reflective screen according to any one of claims 1 to 7.
The screen portion does not have a light diffusing layer containing diffusing particles having a function of diffusing light.
A reflective screen featuring. In the reflective screen according to any one of claims 1 to 8.
A layer having at least one of an antireflection function, a hard coat function, an antistatic function, and an antifouling function is provided on the image source side.
A reflective screen featuring. The reflective screen according to any one of claims 1 to 9.
A plurality of video sources corresponding to the plurality of screen portions of the reflective screen and projecting video light onto the corresponding screen portions,
A video display device comprising.

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