JP2014199375A - Reflective screen and image display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflective screen which is capable of displaying good high-contrast images and can be manufactured at low cost, and to provide an image display system.SOLUTION: A reflective screen 10 visibly displays images by reflecting image light L projected from an image source LS and includes; a prism layer 13 comprising a plurality of unit prisms 131, each being convex on a rear side, arrayed along a vertical direction of a screen; an air layer 14 which is located on the rear side of the prism layer 13, is formed at least between each pair of adjacent unit prisms 131, and has a refractive index lower than that of the prism layer 13; and a light absorption layer 15 which is located on the rear side of the air layer 14 to absorb light.

Description

  The present invention relates to a reflective screen that reflects projected image light and displays an image, and an image display system including the same.

In recent years, reflective screens that reflect image light projected from a projector or the like and display the image so that the image can be observed have been widely used. In addition to displaying a general two-dimensional image, a three-dimensional image is displayed. Have been developed in various ways (for example, Patent Documents 1 and 2).
Reflective screens are often used in home theaters, meetings, presentations, etc., and there is a demand for displaying good images with high contrast in images in a dark room environment as well as in a dark room environment. .

JP 2002-31507 A JP 2010-262046 A

However, a reflective screen designed to improve the contrast of an image has a problem that the layer structure is complicated, the manufacturing process is complicated, and the production cost increases.
The reflection screens described in Patent Documents 1 and 2 have complicated layer configurations and optical shapes, and have special and expensive optical function layers. Patent Documents 1 and 2 display good images. There is no disclosure regarding the inexpensive production of reflective screens.

  An object of the present invention is to provide a reflective screen and an image display system that can display a good image with high contrast and can be manufactured at low cost.

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 a reflective screen that reflects the image light projected from the image source and displays the image so that the image can be observed, and includes a plurality of unit optical elements (131) that are convex on the back side in the vertical direction of the screen. An optical shape layer (13) arranged on the back side of the optical shape layer, formed between the unit optical elements, having a refractive index lower than that of the unit optical elements and having low light refraction. A reflective screen (10) comprising: an index layer (14); and a light absorption layer (15) that is disposed on the back side of the low refractive index layer and absorbs light.
According to a second aspect of the present invention, in the reflective screen according to the first aspect, the unit optical element (131) has a substantially triangular prism shape arranged in the vertical direction of the screen with the horizontal direction of the screen as the longitudinal direction. It is the reflective screen (10) characterized.
According to a third aspect of the present invention, in the reflective screen according to the first or second aspect, the unit optical element (131) has a cross-sectional shape in a cross section perpendicular to the screen surface and parallel to the vertical direction of the screen. The reflective screen (10) is characterized by having a substantially triangular shape and an apex angle of 77 to 131 °.
According to a fourth aspect of the present invention, in the reflective screen according to any one of the first to third aspects, the light having an action of diffusing light closer to the observer side than the low refractive index layer (14). A reflective screen (10) characterized by comprising a diffusion layer (12).
A fifth aspect of the present invention is a video display comprising: the reflective screen according to any one of the first to fourth 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 display a good image with high contrast and can be manufactured at low cost.

It is a figure explaining video display system 1 of an embodiment. It is a figure which shows the layer structure of the reflective screen 10 of embodiment. It is a figure explaining the mode of the image light L and the external light G which inject into the reflective screen 10 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, words such as plate and sheet are used, but these are generally used in the order of thickness, plate, sheet, and film in order of increasing thickness. I use it. However, there is no technical meaning in such proper use, so these terms can be replaced as appropriate.
Furthermore, numerical values such as dimensions and material names of each member described in the present specification are examples of the embodiment, and the present invention is not limited thereto, and may be appropriately selected and used.
In this specification, terms that specify shapes and geometric conditions, for example, terms such as parallel and orthogonal, and the like mean strictly, and also include a state having an error that can be regarded as parallel or orthogonal. .

(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 according to the present embodiment includes a reflective screen 10, a video source LS, and the like. In the 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 (display surface). The video display system 1 can also be used as, for example, a front projection television system. The video display system 1 includes a reflection screen 10, a video source LS, a position detection unit (not shown) that detects the position of the input unit on the observation screen of the reflection screen 10, a personal computer (not shown), and the like. It can also be used as an interactive board system.

  The video source LS is a video light projection device that projects the video light L onto the reflection screen 10. As the video source LS, a general-purpose projector or the like can be used. As shown in FIG. 1B, the image source LS is located on a straight line that passes through the point A, which is the geometric center of the screen when the reflective screen 10 is used, and is parallel to the normal direction of the screen surface. ing. The video source LS is directed from the normal direction of the screen surface to the majority of the screen (display surface) of the reflective screen 10 or from the direction in which the angle formed with respect to the normal direction is 45 ° or less. The image light L can be projected.

The reflection screen 10 reflects the image light L projected by the image source LS toward the observer O and displays an image. When the reflective screen 10 is used, the screen (display surface) of the reflective screen 10 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 up and down direction and the screen left and right direction are the screen up and down direction (vertical direction) and the screen left and right direction (horizontal direction) when the reflective screen 10 is used, unless otherwise specified. To do.
On the back side of the reflective screen 10, a flat support plate 50 is provided via a bonding layer (not shown) made of an adhesive material or the like. The reflection screen 10 maintains the flatness of the screen by the support plate 50. The support plate 50 of the present embodiment is a plate-like member that does not have optical transparency.

FIG. 2 is a diagram showing a layer configuration of the reflective screen 10 of the present embodiment. In FIG. 2, a part of a cross section orthogonal to the screen surface of the reflection screen 10 and parallel to the vertical direction of the screen is shown enlarged. Here, the screen surface indicates a surface in the reflective screen 10 which is a planar direction of the reflective screen 10 when viewed as the whole screen, and also in the present specification and claims. They are used as the same definition. The screen surface of the reflection screen 10 is parallel to the screen (display surface) of the reflection screen 10, and the normal direction of the screen surface is parallel to the thickness direction of the reflection screen 10.
The reflective screen 10 includes a surface layer 11, a base material layer 12, a prism layer 13, an air layer 14, a light absorption layer 15, and the like in that order from the image source side (observation surface side).

The base material layer 12 is a layer that becomes a base material (base) of the reflective screen 10. In the present embodiment, the surface layer 11 is integrally formed on the image source side (observation surface side) of the base material layer 12, and the prism layer 13 is integrally formed on the back surface side (back surface side).
The base material layer 12 contains a diffusing material that diffuses light. Therefore, the base material layer 12 can be made of a resin sheet-like member having a light-transmitting resin as a base material and containing a diffusing material substantially uniformly. By using such a base material layer 12, the viewing angle can be widened and the in-plane uniformity of brightness can be improved without increasing the layers constituting the reflective screen 10, and the production cost can be reduced. It is possible to reduce the thickness and weight of the reflective screen.

As a base material of the base material layer 12, PET (polyethylene terephthalate) resin, PC (polycarbonate) resin, MS (methyl methacrylate / styrene) resin, MBS (methyl methacrylate / butadiene / styrene) resin, acrylic resin, TAC ( Triacetyl cellulose) resin and the like.
Moreover, as the diffusing material contained in the base material layer 12, a light transmissive material is preferable, and acrylic resin, styrene resin, acrylic / styrene copolymer, silicone resin particles, and glass beads are used. And inorganic particles. The average particle diameter of these diffusing materials is preferably about 1 to 30 μm.
Moreover, although the thickness of the base material layer 12 depends on the screen size of the reflective screen 10, it can be set to about 0.025 to 10 mm.

The prism layer 13 is a light-transmitting layer provided on the back side of the base material layer 12, and on the back side (on the side opposite to the base material layer 12 in the thickness direction of the screen), the unit prism 131 is provided. Is an optical shape layer formed by arranging a plurality of layers.
The unit prisms 131 have a substantially triangular prism shape that protrudes toward the back side, and a plurality of units prisms are arranged in the vertical direction of the screen along the screen surface, with the horizontal direction of the screen being the longitudinal direction (the ridge line direction).
The prism layer 13 is formed of an ultraviolet curable resin, and is integrally formed on one surface (surface on the back side) of the base material layer 12 by an ultraviolet molding method or the like.
The prism layer 13 may be formed of another ionizing radiation curable resin such as an electron beam curable resin, or may be an extrusion method or injection molding integrally with the base material layer 12 using a thermoplastic resin. It may be formed by a method or the like, and the formation method or the like of the prism layer 13 may be freely selected as appropriate.

The unit prism 131 has a substantially triangular cross-sectional shape in a cross section parallel to the direction orthogonal to the screen surface (thickness direction of the reflection screen 10) and parallel to the arrangement direction of the unit prisms 131 (the screen vertical direction of the reflection screen 10). It has a shape, and has a vertex t and side surfaces 131a and 131b facing each other across the vertex t.
As shown in FIG. 2, the upper side surface in the vertical direction of the screen is the side surface 131a, the lower side surface is the side surface 131b, and the angles between the side surfaces that are parallel to the screen surface are an angle β and an angle γ, respectively. The unit prism 131 has an apex angle α and an arrangement pitch P.
The apex angle α of the unit prism 131 is preferably 77 to 131 °, and more preferably 90 °. However, this apex angle α is appropriately changed according to the refractive index of the prism layer 13, the refractive index difference between the prism layer 13 and the air layer 14, which will be described later, the position of the image source LS, and the like. Good.
The unit prism 131 of the present embodiment has an isosceles triangular cross section, α = 90 °, and β = γ = 45 °.

The arrangement pitch P, the apex angle α, and the like of the unit prisms 131 are the size of a pixel (pixel) of the video source LS (projector) that projects the video light, the projection angle of the video light of the video source LS (the video light with respect to the screen surface The angle can be appropriately changed according to the incident angle).
In the present embodiment, as shown in FIG. 2, an example is shown in which the arrangement pitch P and the apex angle α of the unit prisms 131 are constant. However, the present invention is not limited to this, and the apex angle α and the arrangement angle are arranged along the arrangement direction. The pitch P, the angle β, and the angle γ may be appropriately changed. In the present embodiment, the cross-sectional shape of the unit prism 131 is an example of an isosceles triangle shape. However, the present invention is not limited to this, and other triangular shapes such as an unequal triangle shape may be used. In the arrangement direction (up and down direction of the screen), the shape is an isosceles triangle at the center, but the shape may be changed to an unequal triangle as it goes upward or downward on the screen.

The air layer 14 is located on the back side of the prism layer 13 and is alternately arranged with the unit prisms 131 in the arrangement direction of the unit prisms 131 (the vertical direction of the screen). The air layer 14 is a low refractive index layer that is filled with air, has a lower refractive index than the prism layer 13, and has optical transparency.
The air layer 14 is in contact with the side surfaces 131 a and 131 b of the unit prism 131.
In the present embodiment, the low refractive index layer is an air layer 14 formed by being filled with air. However, the present invention is not limited thereto, and may be formed of a gas such as nitrogen. However, it may be formed of a resin having a refractive index lower than that of the unit prism 131.

The light absorption layer 15 is a layer provided on the back side of the air layer 14 and has a function of absorbing light.
The light absorption layer 15 of the present embodiment has a black sheet-like member as a base material, and has a black pressure-sensitive adhesive layer (not shown) on the surface that is the image source side (observation surface side) of the base material. ing. The light absorption layer 15 is bonded to the apex t of the unit prism 131 by an adhesive layer, and is bonded to the prism layer 13 with the air layer 14 formed between the unit prisms 131. At this time, a part of the top portion of the unit prism 131 including the vertex t may be in the adhesive layer.

  As a base material for the light absorption layer 15, sheets of PET (polyethylene terephthalate) resin, PC (polycarbonate) resin, MS (methyl methacrylate / styrene) resin, MBS (methyl methacrylate / butadiene / styrene) resin, acrylic resin, etc. A shaped member can be used. In this base material, when the pressure-sensitive adhesive layer is colored in a dark color such as black and has sufficient light absorption, a transparent or translucent member may be used, or a member such as white may be used. Also good. Moreover, as long as a base material is black etc. and it has sufficient light absorptivity, it is good also considering an adhesive layer as transparent or translucent.

The surface layer 11 is a layer provided on the image source side (observer side) of the base material layer 12.
The surface layer 11 has at least one of various functions such as a hard coat function, an antireflection function, an antistatic function, an antiglare function, an antifouling function, and an ultraviolet absorption function.
The surface layer 11 of this embodiment is located on the outermost surface side of the reflective screen 10 on the image source side, has a hard coat function and an anti-glare function, and has irregular irregular shapes on the surface of the image source side. It is arranged and formed. The surface layer 11 is filled with an ultraviolet curable resin having a hard coat function on one surface (surface on the observation surface side) of the base material layer 12 in a mold (mold) capable of forming a fine uneven shape. Then, a fine uneven shape is formed by pressing, irradiating with ultraviolet rays, curing and releasing the mold. The surface layer 11 is not limited to the ultraviolet curable resin, and other ionizing radiation curable resins may be used.

The thickness of the surface layer 11 can be appropriately set according to the desired function, the characteristics of the material to be used, and the like. For example, the thickness can be set to about 1 to 100 μm.
In addition, since the surface layer 11 is formed by irregularly arranging fine irregularities on the surface, in addition to the above-described effects, for example, a function for preventing the reflection of a light source image and external light, and an image It also has a function to widen the viewing angle.

Here, the image light L and the external light G incident on the reflection screen 10 will be described.
FIG. 3 is a diagram for explaining the state of the image light L and the external light G incident on the reflection screen 10 of the embodiment. In FIG. 3, the cross section corresponding to the cross section of the reflective screen 10 shown in FIG. 2 is further enlarged and shown.
In FIG. 3, for easy understanding, the surface layer 11, the base material layer 12, and the prism layer 13 have the same refractive index, and the surface of the surface layer 11 with respect to the image light L and the external light G indicated by the arrows. The diffusing action due to the fine concavo-convex shape and the diffusing action due to the base material layer 12 are omitted.
As shown in FIG. 3, most of the image light L projected from the image source LS has a small normal angle (45 ° or less) with the normal direction and the normal direction of the screen surface of the reflective screen 10 in the vertical direction of the screen. , Enters the unit prism 131 of the prism layer 13 through the surface layer 11 and the base material layer 12.

  The image light L is incident on one side surface 131a of the unit prism 131, for example. At this time, the side surface 131a is in contact with the air layer 14 having a refractive index lower than that of the prism layer 13, and the image light L is incident on the side surface 131a at an angle greater than or equal to the critical angle. Therefore, the image light L is totally reflected by the side surface 131a and enters the other side surface 131b. At this time, since the image light L is incident on the side surface 131b at an angle greater than the critical angle, the image light L is totally reflected by the side surface 131b, travels toward the viewer, exits in a substantially front direction of the reflective screen 10, and reaches the viewer O. To do.

On the other hand, as shown in FIG. 3, unnecessary external light G such as illumination light is incident mainly from above the reflection screen 10, passes through the surface layer 11 and the base material layer 12, and enters the unit prism 131 of the prism layer 13. Incident.
At this time, since the incident angle with respect to the screen surface is larger than the image light L, the external light G is incident on the side surface 131b located on the lower side in the vertical direction of the screen at an angle not exceeding the critical angle. Therefore, the external light G is refracted by the side surface 131 b and enters the air layer 14, passes through the air layer 14, enters the light absorption layer 15, and is absorbed.

From the above, according to the present embodiment, the image light L can be efficiently reflected to the observer O side, and the external light G is absorbed and does not reach the observer O side. Even in a bright room environment, high contrast and bright images can be displayed.
In addition, according to the present embodiment, it is not necessary to form a reflective layer using a metal vapor deposition film or a white or silver ink film as used conventionally, and the shape of the unit prism 131 of the prism layer 13 is also simple. Therefore, the reflective screen 10 can be easily manufactured, and the production cost can be suppressed. Therefore, the cheap and favorable reflective screen 10 and the video display system 1 can be provided.

(Example)
Examples of the reflective screen 10 and the image display system 1 of the present embodiment were created, and the contrast of the image was visually evaluated.
The reflective screen 10 of the embodiment is as follows.
Reflective screen 10: screen size diagonal 40 inches (890 mm × 500 mm)
Surface layer 11: made of ultraviolet curable resin (epoxy acrylate resin) (refractive index 1.52), thickness of about 10 μm. There is a fine uneven shape on the image source side.
Base material layer 12: MBS resin (refractive index 1.55) containing spherical beads made of MS resin (refractive index 1.52, average particle diameter of about 10 μm) as a diffusing material, thickness 200 μm.
Prism layer 13: made of ultraviolet curable resin (urethane acrylate resin) (refractive index 1.60), thickness 45 μm.

Unit prism 131: apex angle α = 90 °, arrangement pitch P = 50 μm, isosceles triangular prism shape.
Air layer 14: Air. Refractive index 1.0.
Light-absorbing layer 15: A base material (thickness 100 μm) made of PET resin colored in black, and an adhesive layer is an acrylic resin-based adhesive colored in black.
Image source LS: disposed at a position of 2 m from the surface of the reflection screen 10 to the image source side in the normal direction passing through the point A on the image source side surface of the reflection screen 10.

When the reflective screen 10 and the video display system 1 of the embodiment as described above were created, and the video light L was actually projected from the video source LS and the video was visually evaluated, a good video with high contrast and high brightness was obtained. It was also observed in a bright room environment.
Moreover, the reflective screen 10 of an Example is easy to manufacture and can provide a favorable reflective screen and video display system at low cost.

(Deformation)
Without being limited to the embodiments described above, various modifications and changes are possible, and these are also within the scope of the present invention.
(1) The video source LS may be configured such that a straight line passing through the point A and the projection opening of the video light of the video source LS forms an angle in the vertical direction of the screen with respect to a straight line passing through the point A and orthogonal to the screen surface. Good. Further, the shape of the unit prism 131 may be changed gradually or stepwise in the vertical direction of the screen in accordance with such a projection system.
Further, the image light L projected from the image source LS may be projected onto the reflection screen 10 after being reflected by a mirror unit (not shown) or the like.

(2) An example in which the unit optical element is a unit prism 131 that has a substantially triangular prism shape, is parallel to the arrangement direction, and has a substantially triangular cross section in a cross section parallel to the normal direction of the screen surface. However, the present invention is not limited to this. For example, the following forms may be adopted.
The unit prism 131 may have a curved surface shape whose top is convex on the back side.
In addition, although the example in which the side surfaces 131a and 131b of the unit prism 131 are smooth surfaces is shown, the present invention is not limited to this, and the side surfaces 131a and 131b may have a fine uneven shape. Further, the prism layer 13 may include a diffusing material.
Furthermore, the unit prism 131 is not limited to a triangular prism shape, and may be, for example, a conical shape or a quadrangular pyramid shape.

The unit optical element may have a substantially trapezoidal shape, a polygonal shape, or the like having a top surface that is parallel or substantially parallel to the screen surface. Examples of such unit optical elements include a quadrangular prism shape, a polygonal column shape, and a frustum shape. At this time, the size of the top surface in the arrangement direction of the unit optical elements is preferably small from the viewpoint of increasing the luminance of the image, but may be appropriately set according to the desired optical performance or the like.
By using the unit optical element having such a shape, the light absorption layer 15 can be more stably bonded to the top surface. At this time, the pressure-sensitive adhesive layer of the light absorption layer 15 preferably has a refractive index smaller than that of the unit optical element from the viewpoint of increasing the luminance of the image.
Further, the unit optical elements may have a cross-sectional shape in a cross section that is parallel to the arrangement direction and orthogonal to the screen surface, and a partial shape of a substantially elliptical shape in which the major axis is orthogonal to the screen surface.

(3) Although the reflective screen 10 showed the example provided with the surface layer 11, the base material layer 12, the prism layer 13, the air layer 14, the light absorption layer 15, etc., not only this but the layer which has various optical effects was shown. It may be provided as appropriate.
For example, the reflective screen 10 is configured such that the base material layer 12 does not contain a light diffusing material and further includes a light diffusing layer having a light diffusing action, and the viewing angle as the reflective screen 10 is improved and luminance unevenness is reduced. Etc. may be planned. At this time, the light diffusing layer may diffuse light isotropically. For example, the diffusing action in the horizontal direction of the screen is larger than the diffusing action in the vertical direction of the screen. It is good also as what has directionality. The light diffusion layer may have a shape containing a diffusing material or various optical shapes such as a lenticular lens shape.
The reflective screen 10 is provided with a colored layer colored with a dye or pigment such as black or gray for obtaining a predetermined transmittance, and the colored layer absorbs external light to improve the contrast of the image. May be. The base material layer 12 may contain a pigment or the like and also serve as a colored layer.

(4) The light absorption layer 15 is not limited thereto, and the light absorption layer 15 and the prism layer are arranged outside the display area of the reflection screen 10 by arranging a spacer between the light absorption layer 15 and the prism layer 13. It is good also as a form which 13 does not touch.

(5) The reflective screen 10 may further be provided with a protective sheet (not shown) made of a resin sheet for protecting the reflective screen 10 from damage or the like on the back side of the light absorbing layer 15. At this time, the protective layer may be a light shielding layer, or the light shielding layer may be laminated on the protective layer.

(6) The reflection screen 10 does not include the support plate 50, and the reflection screen 10 may be arranged to be bonded to a wall surface or the like via an adhesive layer or the like, or the support plate 50 is bonded to the back surface. It is good also as a form etc. which are fixed to a wall surface by suspending on a wall surface with support members, such as a hook. Moreover, in order to maintain the flatness of the screen of the reflective screen 10, the reflective screen 10 may be configured to include a highly rigid substrate layer made of glass or resin, and at this time, sufficient flatness can be maintained. In this case, the support plate 50 may not be used.
Furthermore, in the present embodiment, the example in which the reflective screen 10 has a substantially flat plate shape at the time of use and when it is not used is shown. However, the present invention is not limited to this. Good. In such a form, the support plate 50 or the like is not provided, and the back side of the reflective screen 10 is covered with a cloth or resin light-shielding curtain that hardly transmits light, a protective layer that improves scratch resistance, or the like. It is good.

(7) The video source LS may use a short focus projector. At this time, the image source LS is positioned above or below the reflective screen 10 and image light is incident on the screen surface at a large incident angle. Therefore, it is preferable that the surface layer 11 of the reflective screen 10 is provided with a deflecting optical layer that deflects image light in the normal direction of the screen surface in the vertical direction of the screen. As such a deflecting optical layer, for example, a circular Fresnel having a function in which a plurality of unit lenses are provided with an incident surface and a total reflection surface and reflect and deflect light incident from the incident surface by the total reflection surface. A lens, a linear Fresnel lens, or the like can 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 Image display system 10 Reflective screen 11 Surface layer 12 Base material layer 13 Optical shape layer 131 Unit prism 14 Air layer 15 Light absorption layer LS Image source 50 Support plate

Claims (5)

A reflection screen that reflects image light projected from an image source and displays the image in an observable manner;
An optical shape layer in which a plurality of unit optical elements that are convex on the back side are arranged in the vertical direction of the screen,
A low refractive index layer that is on the back side of the optical shape layer and is formed between the unit optical elements, has a refractive index lower than that of the unit optical elements, and has optical transparency;
A light absorbing layer disposed on the back side of the low refractive index layer and absorbing light;
Providing
Reflective screen featuring. The reflective screen according to claim 1.
The unit optical element has a substantially triangular prism shape arranged in the vertical direction of the screen, with the horizontal direction of the screen being the longitudinal direction.
Reflective screen featuring. The reflective screen according to claim 1 or 2,
The unit optical element has a substantially triangular cross section in a cross section perpendicular to the screen surface and parallel to the vertical direction of the screen, and the apex angle is 77 to 131 °;
Reflective screen featuring. The reflective screen according to any one of claims 1 to 3,
A light diffusion layer having an action of diffusing light on the viewer side of the low refractive index layer;
Reflective screen featuring. A reflective screen according to any one of claims 1 to 4,
An image source for projecting image light onto the reflective screen;
A video display system comprising:

Images