JP2014160198A - Reflection screen and video display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflection screen and a video display system that enable weight saving and thinning, is easy to manufacture, can be offered at an inexpensive price, and is capable of displaying an excellent image.SOLUTION: A reflection screen 10 includes: a lens layer 13 with a plurality of unit lenses 131 aligned on a surface on a back side; a reflection layer 12 formed on a lens surface 132 of the unit lens 131 and configured to reflect light; and a protective layer 11 formed on a further back side of the lens layer 13 and the reflection layer 12, and coating the surface of the back side of the lens layer with the reflection layer 12 formed. The protective layer 11 has tackiness and can be laminated to a component located on a back side of the reflection screen 10.

Description

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

  Conventionally, reflective screens having various configurations have been developed and used in video display systems. In recent years, short focus type video projection devices (projectors) that project a video light at a relatively large incident angle from a close distance to a reflective screen to realize a large screen display have been widely used. Reflective screens and the like have also been developed for satisfactorily displaying video light projected by a short focus type video projector.

The short-focus type image projection device can project image light having a larger incident angle than the conventional image source from above or below on the reflection screen, and in the depth direction between the image projection device and the reflection screen. Since the distance can be shortened, it can contribute to the space saving of the image display system using the reflective screen.
In order to satisfactorily display the image light projected by such a short focus type image projection device, a lens layer having a linear Fresnel lens shape or a circular Fresnel lens shape formed by arranging a plurality of unit lenses. A variety of reflective screens having a reflective layer on the surface and reflective screens having a plurality of hemispherical recesses on the surface have been developed (for example, Patent Documents 1 and 2).

JP 2008-76523 A JP 2011-133608 A

In the reflective screen as described above, a reflective layer made of a metal thin film formed by vapor deposition or sputtering using a highly reflective metal such as aluminum or silver may be used as a reflective layer for reflecting video light. is there. Since such a reflective layer is easily damaged and easily oxidized, a reflective screen provided with a protective layer for protecting the reflective layer has also been developed (for example, Patent Document 2).
In general, the reflective screen is often not rigid enough to maintain flatness by itself. Therefore, in many cases, the flatness is maintained, for example, by bonding to a support plate having sufficient rigidity with an adhesive layer or a pressure-sensitive adhesive layer provided on the most back side of the reflective screen.

However, by providing a protective layer, a pressure-sensitive adhesive layer, etc. in anticipation of various effects, there is a problem that the layer configuration of the reflective screen itself becomes complicated and the production cost increases. It is always required to make a reflective screen that is inexpensive and capable of displaying good images, and to further reduce the weight and thickness of the reflective screen and the like.
The above-mentioned Patent Documents 1 and 2 do not disclose measures against the above-described problems.

  An object of the present invention is to provide a reflective screen and an image display system that can be reduced in weight and thickness, can be easily manufactured, can be provided at low cost, and can display a good image.

The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this.
The invention of claim 1 is an optical shape layer (13) in which a plurality of unit optical elements (131) are arranged on a back surface in a reflective screen that reflects image light projected from an image source so as to be observable. ) And a reflection layer (12) that reflects light and is formed on at least a part of the back surface of the unit optical element, and is formed on the back side of the optical shape layer and the reflection layer. And a protective layer (11) that covers the surface on the back side of the optical shape layer on which the optical shape layer is formed. The protective layer has adhesiveness and is located on the back side of the reflective screen. It is a reflective screen (10) characterized by being able to paste.
The invention according to claim 2 is the reflective screen according to claim 1, wherein the protective layer (11) has at least one of an antioxidant function, a moisture-proof function, an ultraviolet absorption function, and a light absorption function. A reflective screen (10) characterized by
According to a third aspect of the present invention, in the reflective screen according to the first or second aspect, the unit optical element includes a lens surface (132) and a non-lens surface (133), and is a unit that is convex on the back side. A reflection screen (10) characterized by being a lens (131).
According to a fourth aspect of the present invention, there is provided a video display comprising: the reflective screen according to any one of the first to third aspects; and a video source (LS) that projects video light onto the reflective screen. System (1).

  According to the present invention, it is possible to provide a reflective screen and an image display system that can be reduced in weight and thickness, can be easily manufactured, can be provided at low cost, and can display a good image.

It is a figure explaining video display system 1 of an embodiment. It is a figure explaining the layer structure of the reflective screen 10 of embodiment. It is a figure explaining the lens layer 13 of embodiment.

Embodiments of the present invention will be described below with reference to the drawings. In addition, each figure shown below including FIG. 1 is the figure shown typically, and the magnitude | size and shape of each part are exaggerated suitably for easy understanding.
In addition, the numerical values such as the dimensions of the respective members and the material names described in the present specification are examples of the embodiment, and are not limited thereto, and may be appropriately selected and used.
In this specification, terms that specify shape and geometric conditions, for example, terms such as parallel and orthogonal, are strictly meanings, have similar optical functions, and can be regarded as parallel and orthogonal It also includes a state having an error of.

(Embodiment)
FIG. 1 is a diagram illustrating a video display system 1 according to the present embodiment. FIG. 1A is a perspective view of the video display system 1, and FIG. 1B is a side view of the video display system 1.
The video display system 1 includes a reflective screen 10, a video source LS, and the like. In this video display system 1, the reflective screen 10 reflects the video light L projected from the video source LS, and displays the video on the screen. The video display system 1 of the present embodiment can be used as a front projection television system or the like.

The video source LS is a video light projection device that projects the video light L onto the reflection screen 10.
The video source LS of this embodiment is a general-purpose short focus projector. When the screen of the reflective screen 10 is viewed from the front direction (normal direction of the screen surface) in the use state, the video source LS is the center in the left-right direction of the screen of the reflective screen 10 and the screen of the reflective screen 10 It is arranged at a position below the (display area) and on the viewer side.
The video source LS can project the video light L from a position where the distance from the reflective screen 10 in the normal direction of the screen surface of the reflective screen 10 (thickness direction of the reflective screen 10) is much closer than that of a conventional general-purpose projector. . That is, the image source LS has a shorter projection distance to the reflection screen 10 than the conventional general-purpose projector, and the incident angle of the image light L with respect to the reflection screen 10 is larger than that of the conventional projector.

  Note that the screen surface refers to a surface in the planar direction of the reflection screen 10 when viewed as the entire reflection screen 10. In the present embodiment, the screen surface of the reflective screen 10 is parallel to the screen of the reflective screen 10.

The reflection screen 10 is a screen that displays the image by reflecting the image light L projected by the image source LS toward the observer O side. In the state of use, it is assumed that the screen of the reflective screen 10 of the present embodiment has a substantially rectangular shape with the long side direction being the horizontal direction of the screen when viewed from the observer O side.
In the following description, the screen vertical direction, screen horizontal direction, and thickness direction are the screen vertical direction (vertical direction), screen horizontal direction (horizontal direction), and thickness in the usage state of the reflective screen 10 unless otherwise specified. The direction (depth direction) is assumed.

The reflective screen 10 is provided with a flat support plate 50 on the back side thereof, and the flatness is maintained by being bonded to the support plate 50. The support plate 50 of the present embodiment is a flat plate member having high rigidity. For example, a plate member made of resin such as acrylic resin or PC resin, metallic such as aluminum, or wooden plate can be used.
The support plate 50 may have light transmittance. However, it is preferable that the support plate 50 does not have light transmittance from the viewpoint of suppressing a decrease in contrast of an image due to external light or the like incident from the back side of the reflective screen 10. Further, the support plate 50 is not limited to a flat plate shape, for example, by providing a honeycomb structure formed of a metal thin plate such as aluminum on the front and back surfaces and a metal thin plate such as aluminum as an inner core material, A metal plate material (so-called honeycomb panel) or the like that reduces the weight of the entire plate material may be used. By using such a member, it is possible to reduce the weight of the support plate 50 and reduce the weight of the reflective screen 10 including the support plate 50 while ensuring sufficient rigidity.

FIG. 2 is a diagram illustrating the layer configuration of the reflective screen 10 of the present embodiment. In FIG. 2, it passes through the point A (see FIGS. 1A and 1B) which is the geometric center of the screen (display area) of the reflective screen 10, is parallel to the vertical direction of the screen, and is orthogonal to the screen surface. A part of a cross section (parallel to the thickness direction) is shown in an enlarged manner, and the above-described support plate 50 is also shown.
The reflective screen 10 includes a surface layer 15, a base material layer 14, a lens layer 13, a reflective layer 12, a protective layer 11, and the like in that order from the image source side (observer side). The reflective screen 10 has a large screen (display area) such as a diagonal of 80 inches or 100 inches.
Below, each layer of the reflective screen 10 is demonstrated.

In the base material layer 14, the surface layer 15 is integrally formed on the observer side, and the lens layer 13 is integrally formed on the back side (back side). The base material layer 14 is a layer that becomes a base material (base) for forming the lens layer 13.
The base material layer 14 has a light diffusion layer 141 and a colored layer 142, which are laminated together. In the present embodiment, as illustrated in FIG. 2A, an example in which the light diffusion layer 141 is on the back side and the colored layer 142 is positioned on the viewer side (video source side) has been described. The light diffusion layer 141 may be located on the viewer side, and the colored layer 142 may be located on the back side.

The light diffusing layer 141 is a layer having a light diffusing action, containing a light transmissive resin as a base material and containing a light diffusing material. The light diffusion layer 141 has a function of widening the viewing angle and improving the in-plane uniformity of brightness.
Examples of the resin used as the base material of the light diffusion layer 141 include PET (polyethylene terephthalate) resin, PC (polycarbonate) resin, MS (methyl methacrylate / styrene) resin, MBS (methyl methacrylate / butadiene / styrene) resin, acrylic resin, and the like. System resin, TAC (triacetyl cellulose) resin, PEN (polyethylene naphthalate) resin, etc. can be used.

The thickness of the light diffusion layer 141 is preferably about 150 to 3000 μm (about 0.15 to 3 mm), although it depends on the screen size of the reflection screen 10.
Moreover, as a diffusing material, it is possible to use resin particles such as acrylic resin, epoxy resin, and silicon, inorganic particles, and the like, and those having an average particle diameter of about 1 to 50 μm are preferably used. .

The colored layer 142 is a layer colored with a coloring material such as a dye or a pigment such as gray or black for obtaining a predetermined transmittance. The colored layer 142 has a function of absorbing unnecessary external light such as illumination light incident on the reflective screen 10 and stray light and improving the contrast of the image.
The colored layer 142 is preferably formed of a PET resin containing a coloring material such as a dye or a pigment, a PC resin, an MS resin, an MBS resin, an acrylic resin, a TAC resin, a PEN resin, or the like. In addition, as the coloring material, it is possible to use a dark-colored dye or pigment such as gray or black, or a metal salt such as carbon black, graphite, or black iron oxide.
The thickness of the colored layer 142 is preferably about 30 to 3000 μm, although it depends on the screen size of the reflective screen 10.
The base material layer 14 of the present embodiment is formed by integrally laminating the light diffusion layer 141 and the colored layer 142 so that these layers are laminated together.

FIG. 3 is a diagram illustrating the lens layer 13 of the present embodiment. FIG. 3A shows a state in which the lens layer 13 is observed from the front side on the back side, and the reflection layer 12, the protective layer 11, and the support plate 50 are omitted for easy understanding. . FIG. 3B shows an enlarged part of the cross section shown in FIG.
The lens layer 13 is an optical shape layer that is provided on the back side of the base material layer 14 and is made of a resin having optical transparency, and has an optical shape on the back side surface. The lens layer 13 has a circular Fresnel lens shape in which a plurality of unit lenses 131 are arranged concentrically around the point C as shown in FIG.

In this embodiment, the circular Fresnel lens shape formed by arranging the unit lenses 131 is Fresnel, which is the optical center when the screen of the reflective screen 10 is viewed from the front direction (normal direction of the screen surface). The center point C is the center of the reflective screen 10 in the horizontal direction of the screen, and is located below the screen (display area) of the reflective screen 10.
In addition, although the lens layer 13 of this embodiment gives and demonstrates the example which has a circular Fresnel lens shape in the surface of a back side as mentioned above, it is good also as a form which has a linear Fresnel lens shape in the surface of a back side. .

2 and 3B, the unit lens 131 is parallel to the direction orthogonal to the screen surface (thickness direction of the reflective screen 10) and is a cross section in a cross section parallel to the arrangement direction of the unit lenses 131. The shape is a substantially triangular shape.
The unit lens 131 is convex on the back side, and includes a lens surface 132 and a non-lens surface 133 that faces the lens surface 132. In the usage state of the reflective screen 10, the lens surface 132 is positioned above the non-lens surface 133 in the vertical direction across the vertex t in the cross section shown in FIGS. 2 and 3B.

In the unit lens 131, as shown in FIG. 3B, the angle formed between the lens surface 132 and the surface parallel to the screen surface is α, and the angle formed between the non-lens surface 133 and the surface parallel to the screen surface is β (β> α).
The arrangement pitch of the unit lenses 131 is P, and the lens height of the unit lenses 131 (the dimension from the apex t in the thickness direction of the screen to the point v that is the valley bottom between the unit lenses 131) is h.
In order to facilitate understanding, in FIG. 2 and the like, the arrangement pitch P and the angles α and β of the unit lenses 131 are shown to be constant in the arrangement direction of the unit lenses 131. However, the unit lens 131 of the present embodiment has a constant arrangement pitch P and the like, but the angle α gradually increases as the angle α moves away from the point C that becomes the Fresnel center in the arrangement direction of the unit lenses 131. ing.

  However, the present invention is not limited to this, and the angle α or the like may be constant, or the arrangement pitch P may gradually change along the arrangement direction of the unit lenses 131, and the pixel of the video source LS that projects the video light. It can be appropriately changed according to the size of (pixel), the projection angle of the image source LS (the incident angle of image light on the screen surface of the reflection screen 10), the screen size of the reflection screen 10, the refractive index of each layer, and the like. .

The lens layer 13 is formed of an ultraviolet curable resin such as urethane acrylate or epoxy acrylate. The lens layer 13 may be formed of another ionizing radiation curable resin such as an electron beam curable resin.
The lens layer 13 of the present embodiment is shaped, for example, in the shape of a circular Fresnel lens filled with an ultraviolet curable resin on one surface of the base material layer 14 (the surface on the light diffusion layer 141 side in the present embodiment). It is formed by an ultraviolet molding method or the like in which a mold is pressed, irradiated with ultraviolet rays and cured, and then released from the mold.
For this reason, the ultraviolet curable resin or the like that forms the lens layer 13 is blended with various additives such as a phosphoric acid ester that serves as a release agent for improving the releasability from the mold.

The reflection layer 12 is a layer having an action of reflecting light. The reflective layer 12 is formed on at least the lens surface 132.
In the present embodiment, the reflection layer 12 is formed on the lens surface 132 as shown in FIG. 2 and FIG. 3B, but not on the non-lens surface 133.
The reflective layer 12 is preferably formed on the lens surface 132 by vapor-depositing a metal such as aluminum, silver, or nickel, sputtering, or transferring a metal foil.
The reflective layer 12 of this embodiment is formed by evaporating aluminum or the like on the lens surface 132.

The protective layer 11 is provided on the back side of the reflective layer 12 and the lens layer 13 so as to cover them. In addition, as shown in FIG. 2 and the like, the protective layer 11 has an image source side (observer side) surface that follows the uneven shape of the unit lens 131 on which the reflective layer 12 is formed. It becomes a form which fully fills the valley part between 131. Further, the surface on the back side of the protective layer 11 has a surface shape parallel to the screen surface, and this surface is in contact with the image source side surface of the support plate 50.
This protective layer 11 has adhesiveness and has a function of bonding the reflective screen 10 to the support plate 50.

Further, as shown in FIG. 2 and the like, the protective layer 11 covers the back surface of the reflective layer 12 and the non-lens surface 133, and the protective layer 11 is formed on the non-lens surface 133. ing.
Therefore, it is preferable that the protective layer 11 has an action of absorbing light from the viewpoint of absorbing external light and the like incident from the observer side and improving contrast. In particular, when the support plate 50 has light transmittance, it is preferable that the support plate 50 has a light absorbing function from the viewpoint of suppressing a decrease in contrast due to external light incident from the back side.

Furthermore, it is preferable that the protective layer 11 has a function of protecting the reflective layer 12 and the lens layer 13 by suppressing deterioration such as oxidation of the reflective layer 12, peeling due to this, damage of the reflective layer 12 and the lens layer 13, and the like. .
In addition, it is preferable that the protective layer 11 has an ultraviolet absorbing function from the viewpoint of suppressing deterioration of the lens layer 13 due to ultraviolet rays incident from the observer-side surface and the like of the reflective screen 10.
The protective layer 11 of this embodiment has adhesiveness, and has a light absorbing function, an antioxidant function, a moisture proof function, an ultraviolet absorbing function, and the like for protecting the reflective layer 12 and the like.

Such a protective layer 11 is formed of, for example, a resin having pressure-sensitive adhesive properties to which various additives such as a light absorbing material, an antioxidant, a moisture proofing agent, and an ultraviolet absorber are added.
As the pressure-sensitive adhesive resin used as the base material of the protective layer 11, for example, an acrylic or epoxy polymer can be used.
As the light absorbing material, for example, a dark paint such as black, a dark pigment such as black, a dye, a bead having a light absorbing action, or the like can be used.

Examples of the antioxidant include 2,6-di-t-butylparacresol, 4,4′methylenebis (2,6-di-butylphenol), and 4,4′methylenebis (6-t-butyl-o-cresol). ), Phenyl-α-naphthylamine, phenothiazine, P, P′-dioctyldiphenylamine, N, N′disalicylidene-1,2-diaminopropane, benzotriazole, 2 (n-dodecyldithio) benzimidazole, etc. An agent can be used. These antioxidants may be used alone or in combination of two or more.
In addition, regarding antioxidant, it is preferable that mass ratio with respect to resin used as the base material which forms the protective layer 11 shall be 1% or more and 3% or less. If it is less than 1%, the anti-oxidation function by the protective layer 11 is lowered, and there is a problem that it becomes insufficient. Moreover, when it exceeds 3%, there exists a problem that the adhesiveness of the protective layer 11, the lens layer 13, and the reflection layer 12 falls. Therefore, it is preferable to be within the above range.

As the moisture-proofing agent, silica gel, calcium carbonate, or the like can be used.
As the ultraviolet absorber, benzotriazole, benzophenone, salicylate, cyanoacrylate, nickel, triazine, or the like can be used.
The pressure-sensitive adhesive resin to which these various additives are added is adjusted to a predetermined viscosity and applied to the back side (Fresnel lens shape side) of the lens layer 13 in which the reflective layer 12 is formed on the lens surface 132. Thus, the protective layer 11 is formed.

Here, the resin forming the protective layer 11 described above preferably has a viscosity (20 ° C.) of 2000 to 10,000 cp when applied to the back side of the lens layer 13.
When the viscosity of the resin is less than 2000 cp, there is a problem that the fluidity is too large to form a sufficient thickness. On the other hand, if the viscosity of the resin is greater than 10,000 cp, the uneven shape of the unit lens 131 cannot be followed, bubbles are generated in the valleys between the unit lenses 131, the light absorptivity is reduced, and the lens layer 13 and the reflective layer 12 are reduced. There is a possibility that the adhesion between the protective layer 11 and the protective layer 11 is lowered. Therefore, it is preferable to be within the above range.
The unit lens 131 of the lens layer 13 of the present embodiment has a lens height h of about 15 to 35 μm, and if the viscosity is in the above range, a resin that sufficiently forms the protective layer 11 is used as the unit lens 131. It can be filled in the valleys.
Further, in the thickness direction of the reflective screen 10, the protective layer 11 has a size from the apex t between the unit lenses 131 to the back side surface of about 10 to 30 μm so as to be in close contact with the support plate 50. From the viewpoint of sufficiently exhibiting the properties and light absorption.

Since the protective layer 11 of this embodiment has adhesiveness, and the reflective screen 10 can be bonded to the support plate 50 by this protective layer 11, another adhesive layer is newly provided on the back side of the protective layer 11. There is no need to form an agent layer or the like, and the reflective screen 10 can be easily made thinner and lighter. Moreover, since it is not necessary to newly form an adhesive layer, the man-hour concerning manufacture of the reflective screen 10 can be reduced, and production cost can be reduced.
Moreover, since the protective layer 11 has light absorptivity, it can absorb external light and improve the contrast of an image.

Furthermore, the reflective screen 10 may absorb humidity in the air in a general usage environment. Even when the back plate is provided with a support plate as in the present embodiment and is bonded to the support plate, for example, moisture in the air may be absorbed from the outer peripheral end surface of the reflection screen 10 or the like.
When such moisture reaches the lens layer 13, a phosphate ester or the like that is generally contained in the resin forming the lens layer 13 as a release agent is hydrolyzed and decomposed into phosphoric acid and alcohol, which are strong acids. . There is a problem that the metallic reflective layer 12 is oxidized by the phosphoric acid, moisture, and the like. In particular, when the reflective layer 12 is formed of a metal vapor-deposited film, there is a problem that the vapor-deposited film deteriorates and becomes brittle due to oxidation and peels off from the lens surface or the like.
However, since the protective layer 11 contains the antioxidant and the moisture-proofing agent as described above, the oxidation of the reflective layer 12 and the peeling due to this can be significantly suppressed.

In addition, the protective layer 11 has a sufficient thickness as described above and covers the surface on the back side of the lens layer 13 on which the reflective layer 12 is formed. The damage etc. resulting from the impact etc. from the exterior of the layer 12 can be suppressed, and adhesiveness with the support plate 50 can be improved.
Furthermore, since the protective layer 11 has the above-described viscosity at the time of application formation, it can sufficiently follow the uneven shape formed by the unit lens 131 without generating bubbles or the like. Therefore, sufficient adhesion between the lens layer 13 and the reflective layer 12 and the protective layer 11 can be maintained.

Returning to FIG. 2, the surface layer 15 is a layer provided on the viewer side (image source side) in the reflective screen 10. In the present embodiment, the surface layer 15 is on the viewer side of the base material layer 14, and is provided at a position closest to the viewer side in the reflective screen 10.
The surface layer 15 can be provided with one or a plurality of necessary functions such as an antireflection function, an antiglare function, an ultraviolet absorption function, an antifouling function, an antistatic function, a hard coat function, and a touch panel function. .

The surface layer 15 of this embodiment has an antiglare function and a hard coat function. The surface layer 15 has a fine uneven shape (mat shape) on the surface on the viewer side, and is formed of an ionizing radiation curable resin or the like having a hard coat function. The thickness of the surface layer 15 can be about 10 to 100 μm.
This surface layer 15 may be a layer separate from the base material layer 14 and may be joined to the base material layer 14 by an adhesive material (not shown) or the like. It is good also as a form directly formed by apply | coating resin etc. which have various functions.

The state of the image light and the external light incident on the reflection screen 10 of this embodiment will be described. In order to facilitate understanding, it is assumed that the refractive index of the surface layer 15, the base material layer 14 (the base material of the colored layer 142 and the light diffusion layer 141), and the lens layer 13 are the same, and the image light L 1 and the external light G 1 and G 2. The light diffusing action of the light diffusing layer 141 with respect to is omitted and shown in FIG.
As shown in FIG. 2, most of the image light L <b> 1 projected from the image source LS enters from below the reflection screen 10, passes through the surface layer 15 and the base material layer 14, and unit lens 131 of the lens layer 13. Incident to
Then, the image light L1 enters the lens surface 132, is reflected by the reflective layer 12, and exits from the reflective screen 10 toward the observer O side. The image light L1 is projected from below the reflection screen 10, and the angle β (see FIG. 3B) is larger than the incident angle of the image light L1 at each point in the screen vertical direction of the reflection screen 10. Therefore, the image light L1 does not directly enter the non-lens surface 133, and the non-lens surface 133 does not affect the reflection of the image light L1.

On the other hand, unnecessary external lights G1 and G2 such as illumination light are incident mainly from above the reflection screen 10 and transmitted through the surface layer 15 and the base material layer 14 as shown in FIG. Incident on 131.
A part of the external light G1 enters the non-lens surface 133 and is absorbed by the protective layer 11. In addition, a part of the external light G2 is reflected by the lens surface 132 and mainly travels to the lower side of the reflective screen 10, so that it does not reach the observer O directly. Significantly less than light L1. Therefore, the reflective screen 10 can suppress a decrease in the contrast of the image due to the external lights G1 and G2.
Therefore, according to the reflective screen 10 of this embodiment, a bright and good image can be displayed even in a bright room environment.

  From the above, according to the present embodiment, the reflective screen 10 and the video display system 1 that can be reduced in weight and thickness, can be easily manufactured, can be provided at low cost, and can display a good video are provided. it can.

(Deformation)
The present invention is not limited to the embodiment described above, and various modifications and changes are possible, and these are also within the scope of the present invention.
(1) In the present embodiment, the lens layer 13 having the Fresnel lens shape in which a plurality of unit lenses 131 are arranged on the back side surface is shown as the optical shape layer. The unit optical element to be formed may be changed according to the above.
For example, the optical shape layer may be a prism layer in which a plurality of unit prisms are arranged on the back side, and a reflection layer may be formed on the slope of the unit prism.
The optical shape layer is a form in which a light transmitting portion having a rectangular cross-sectional shape and a light absorbing portion having a rectangular or wedge-shaped cross-sectional shape are alternately arranged along the screen surface. It is good also as a form formed in the surface at the back side of a permeation | transmission part.

(2) In the present embodiment, the lens layer 13 that is an optical shape layer uses an ultraviolet curable resin such as epoxy acrylate. However, the present invention is not limited to this, and the optical shape layer is the shape of the unit optical element. For example, it may be made of a thermoplastic resin and formed by an extrusion molding method or an injection molding method.

(3) In the present embodiment, the example in which the reflective layer 12 is formed of a metal thin film by a vapor deposition method, a sputtering method, or the like has been shown. However, the present invention is not limited thereto, and for example, the reflective layer 12 is white or silver-based. , UV curable resin or thermosetting resin containing white or silver pigments or beads, paint containing particles or fine flakes obtained by pulverizing metal deposited films such as silver or aluminum, metal foil, etc. May be formed by applying and curing by various coating methods such as spray coating, die coating, screen printing, and groove filling by wiping.

(4) In this embodiment, the video display system 1 includes a video source LS that is a short focus type projector, and a reflective screen 10 that reflects the video light L projected from the video source LS and displays a video. It was supposed to be prepared. However, the present invention is not limited to this. For example, the image source LS is a conventional general-purpose projector having a long projection distance and a small image light projection angle (that is, an incident angle of the image light on the screen), and the reflection screen 10 is the image. It is good also as a form corresponding to the source LS.

(5) In this embodiment, the base material layer 14 showed the example by which these layers were laminated | stacked integrally by coextruding the light-diffusion layer 141 and the colored layer 142, and was shown. However, the present invention is not limited thereto, and for example, the light diffusion layer 141 and the colored layer 142 may be separately extruded and joined together by an adhesive layer or the like to form the base material layer 14.
Alternatively, the base material layer 14 may be a single layer and may contain both a diffusing material and a colorant such as a pigment or a dye. Furthermore, the base material layer 14 includes a light diffusing layer 141 and a colored layer 142, and the colored layer 142 includes a diffusing material in addition to the coloring material, or the light diffusing layer 141 includes a coloring material in addition to the diffusing material. Or a form containing

(6) In the present embodiment, the unit lens 131 has an example in which the cross-sectional shape shown in FIG. 2 and the like is a substantially triangular shape. However, the unit lens 131 is not limited thereto, and is, for example, a substantially trapezoidal shape. It is good also as a form which a surface opposes on both sides of the top surface parallel to a screen surface. At this time, the top surface is preferably formed in a region that does not contribute to the reflection of the image light. A protective layer 11 may be formed on the top surface, or a reflective layer 12 may be formed.
In the present embodiment, the unit lens 131 has an example in which the lens surface 132 and the non-lens surface 133 are linear in the cross section shown in FIG. 2 and the like. A part of the lens surface 132 or the non-lens surface 133 may be curved.
Furthermore, at least one of the lens surface 132 and the non-lens surface 133 of the unit lens 131 may be configured by a plurality of surfaces.

(7) In the present embodiment, the reflective screen 10 has an example in which the reflective layer 12 is not formed on the non-lens surface 133 and is covered with the protective layer 11. Alternatively, the reflective layer 12 may be formed. In this case, the reflective layer 12 may be formed so that the valleys between the unit lenses 131 are filled so that the surface on the back side thereof is substantially planar, or has a predetermined thickness along the uneven shape of the unit lenses 131. The thickness may be formed, or the thickness may not be uniform as long as it has sufficient reflection characteristics.

(8) In this embodiment, the reflective screen 10 showed the example bonded by the protective layer 11 to the support plate 50 provided in the back side, but it is not restricted to this, For example, the support plate 50 is used. The reflective screen 10 may be bonded to the wall surface or the like by the protective layer 11 without being provided, or may be fixed to the wall surface while being bonded to the support plate 50 or suspended from the wall surface by a support member such as a hook. It is good also as a form etc.
Moreover, the reflective screen 10 is good also as a form provided as a product in the state which laminated | stacked the peeling paper not shown and the like which can be peeled on the surface of the back side of the protective layer 11. In this case, the user can select the support plate as appropriate and paste the reflective screen 10 together.

(9) In the present embodiment, the reflective screen 10 is configured from the back side in the order of the protective layer 11, the reflective layer 12, the lens layer 13, the base material layer 14 (light diffusion layer 141, colored layer 142), and the surface layer 15. Although the example to be described was demonstrated, it is not limited to this. For example, the reflective screen 10 may be provided with a transparent base material layer serving as a base material of the lens layer 13 between the base material layer 14 and the lens layer 13, and has a diffusion characteristic in the screen vertical direction and the screen horizontal direction. Different anisotropic diffusion layers and the like may be provided, and the layer configuration of the reflective screen 10 can be changed as appropriate in accordance with desired optical characteristics and the like.

(10) In the present embodiment, the video source LS is positioned below the reflective screen 10 in the vertical direction, and the video light L is projected obliquely upward from below the reflective screen 10. However, the present invention is not limited thereto. For example, the video source LS may be positioned above the reflective screen 10 in the vertical direction, and the video light L may be projected obliquely downward from above the reflective screen 10. At this time, the reflective screen 10 reverses the vertical direction of the lens layer 13 shown in FIGS. 2 and 3 and the like, and the point C which is the optical center (Fresnel center) of the circular Fresnel lens is located above the reflective screen 10. The form may be used.

  In addition, although this embodiment and modification can also be used in combination as appropriate, detailed description is abbreviate | omitted. Further, the present invention is not limited by the above-described embodiments and the like.

DESCRIPTION OF SYMBOLS 1 Video display system 10 Reflective screen 11 Protective layer 12 Reflective layer 13 Lens layer 14 Base material layer 141 Light diffusion layer 142 Colored layer 15 Surface layer 50 Support plate LS Image source

Claims (4)

In the reflective screen that reflects the image light projected from the image source and displays it for observation,
An optical shape layer in which a plurality of unit optical elements are arranged on the back side surface,
A reflective layer that is formed on at least a portion of the back surface of the unit optical element and reflects light;
A protective layer that is formed on the back side of the optical shape layer and the reflective layer, and covers a surface on the back side of the optical shape layer on which the reflective layer is formed;
With
The protective layer has adhesiveness and can be bonded to a member located on the back side of the reflective screen;
Reflective screen featuring. The reflective screen according to claim 1.
The protective layer has at least one of an antioxidant function, a moisture-proof function, an ultraviolet absorption function, and a light absorption function;
Reflective screen featuring. The reflective screen according to claim 1 or 2,
The unit optical element is a unit lens that includes a lens surface and a non-lens surface and is convex on the back side;
Reflective screen featuring. The reflective screen according to any one of claims 1 to 3,
An image source for projecting image light onto the reflective screen;
A video display system comprising:

Images