JP2018025620A - Transmissive screen and video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmissive screen that has further improved visibility of an image to be displayed.SOLUTION: A transmissive screen 20 has a first screen sheet with an aspect ratio of 1:5 to 1:25 on which video light projected from a video source is projected laminated on a second screen sheet with an aspect ratio of 1:5 to 1:25 that emits the video light projected on the first screen sheet toward an observation side. The laminated first screen sheet and second screen sheet have a two-dimensional curved surface shape curved along the transverse direction and convex on a video light emission side.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a transmissive screen and a video display device including the same.

  2. Description of the Related Art Conventionally, there has been known a video display device that projects video light output from a projector onto the back side of a screen and displays it on an observation side. In this type of video display device, a transmission screen in which a Fresnel lens sheet and a lenticular lens sheet are laminated is used (for example, see Patent Document 1).

JP 2004-94147 A

2. Description of the Related Art In recent years, there is a usage form in which a video display device having a transmissive screen is installed on a display shelf of a product such as a retail store, and an image related to product information such as an explanatory note regarding the product and price is displayed on the transmissive screen.
In such a usage form, in order to enhance the appeal effect of the product to the customer, it is required to further improve the visibility of the image displayed on the transmission screen.

  An object of the present invention is to provide a transmissive screen and a video display device in which the visibility of a displayed image is further improved.

The present invention solves the 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. In addition, the configuration described with reference numerals may be improved as appropriate, or at least a part thereof may be replaced with another component.
-1st invention projects the image light projected from the image source on a sheet | seat surface, the 1st screen sheet (21) of aspect ratio 1: 5-1: 25, and the said 1st screen sheet And a second screen sheet (22) having an aspect ratio of 1: 5 to 1:25, which emits the image light directed toward the viewing side, and is laminated to the first screen. The screen sheet and the second screen sheet are a transmissive screen (20) characterized by having a two-dimensional curved surface that is curved in the lateral direction and is convex on the image light output side.
-2nd invention is the transmission type screen of 1st invention, The said 1st screen sheet (21) refracts the projected image light to a desired light emission angle, and the said 2nd screen sheet (22) side It is a transmission type screen (20) characterized by emitting light.
-3rd invention is a transmission type screen of 1st invention or 2nd invention, The said 2nd screen sheet (22) makes the image light projected on the said 1st screen sheet (21) to an observation side. It is a transmission type screen (20) characterized by diffusing towards.
The fourth invention is the transmission screen (20) of any one of the inventions from the first invention to the third invention, a housing (10) to which the transmission screen can be attached, and the transmission screen A video display device (1) provided with a projector (30) for projecting video light.

  According to the present invention, it is possible to provide a transmissive screen and a video display device in which the visibility of a displayed image is further improved.

It is the figure which showed the structure of the projection type display apparatus 1 of embodiment. It is sectional drawing in the AA of FIG.1 (b). It is sectional drawing in the BB line of FIG.1 (b). It is sectional drawing in the CC line of FIG.1 (c). 2 is an exploded perspective view of a transmission screen 20. FIG. 3 is a diagram illustrating a layer configuration of a transmission screen 20. FIG. It is a schematic diagram explaining the shape of the screen holding groove. FIG. 6 is a plan view for explaining a procedure for attaching the screen 20 to the bezel portion 11.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings of this embodiment, the size, ratio, and the like of the members are changed or exaggerated as necessary.
In the drawings described below, a biaxial or triaxial coordinate system using XYZ is described. In this coordinate system, when the transmissive screen 20 is used, the screen vertical direction (vertical direction) is the Z direction, the screen horizontal direction (horizontal direction) is the X direction, and the thickness direction (depth direction) is the Y direction.

  FIG. 1 is a diagram showing a configuration of a projection display device 1 of the present embodiment. FIG. 1A is a perspective view of the projection display device 1. FIG. 1B is a front view of the projection display device 1. FIG. 1C is a left side view of the projection display device 1. FIG. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a cross-sectional view taken along line BB in FIG. FIG. 4 is a cross-sectional view taken along line CC of FIG. FIG. 5 is an exploded perspective view of the transmission screen 20. FIG. 6 is a diagram for explaining the layer structure of the transmission screen 20.

As shown in FIG. 1A, a projection display device (video display device) 1 according to this embodiment includes a housing 10, a transmission screen (hereinafter also referred to as “screen”) 20, and a projector 30 (see FIG. 1). 2).
The housing 10 is a structure to which the screen 20 can be fixed, and as shown in FIG. 1A, the entire housing 10 is formed in an elongated box frame shape. As shown in FIG. 2, a screen 20, a projector 30, and the like are housed inside the housing 10.
As shown in FIG. 2, the housing 10 includes a bezel portion 11 on the image light observation side (front side) and a back cover 15 on the back side.

The bezel portion 11 is a portion that holds the screen 20 in a state where both the left and right sides and the upper side can be expanded and contracted. As shown in FIG. 2, the bezel portion 11 includes a front frame portion 12 and a screen holding groove 13.
The front frame portion 12 is a portion that supports the four sides of the screen 20 and exposes the screen 20 to the observation side. As shown in FIG. 3, the front frame portion 12 has a two-dimensional curved surface shape that is convex on the image light emission side in plan view. The front frame portion 12 includes an opening 12a. As shown in FIG. 1B, the opening 12a is formed in an elongated rectangular shape when viewed from the front. A female screw (not shown) into which a screw 141 (described later) can be fitted is formed on the inner side (projector 30 side) of the front frame portion 12. The screw 141 is a component for attaching the screen holding frame 14 to the housing 10.

  The screen holding groove 13 is a groove into which the lower side of the screen 20 is fitted. The groove width of the screen holding groove 13 is set to be slightly larger than the thickness of the screen 20. Further, as will be described later, the screen holding groove 13 has a two-dimensional curved surface shape that protrudes toward the image light emission side.

  As shown in FIG. 3, the housing 10 includes a screen holding frame 14 on the back side of the screen 20. The screen holding frame 14 is a member for fixing the screen 20. As shown in FIG. 4, the screen holding frame 14 includes an elongated rectangular opening 14a and an outer frame portion 14b that surrounds the four sides of the opening 14a. As shown in FIG. 2, the image light projected from the projector 30 passes through the opening 14 a of the screen holding frame 14 and reaches the screen 20. Further, as shown in FIG. 3, the screen holding frame 14 has a two-dimensional curved surface shape that is convex toward the image light emitting side, like the screen holding groove 13. A hole (not shown) through which the screw 141 passes is formed in the outer frame portion 14 b of the screen holding frame 14. The attachment of the screen 20 to the housing 10 will be described later.

  As shown in FIG. 5, the screen 20 is a sheet-like optical member in which a first screen sheet 21 and a second screen sheet 22 are laminated. Note that the screen 20 shown in FIG. 5 shows a state (flat plate shape) before being attached to the housing 10. In the following description, the first screen sheet 21 and the second screen sheet 22 are also collectively referred to as “sheets”.

  The first screen sheet 21 is an optical sheet on which the image light projected from the projector 30 is projected. The first screen sheet 21 has a function of refracting the projected image light to a desired light output angle to emit light to the second screen sheet side. The first screen sheet 21 is disposed on the back side (projector 30 side) of the screen 20.

As shown in FIG. 6, the first screen sheet 21 includes a diffusion layer 211, a base material layer 213, and a Fresnel lens layer 212 in order from the image light incident side (−Y side).
The diffusion layer 211 is a layer that diffuses incident video light.
The Fresnel lens layer 212 is a layer that functions as a photorefractive layer. As shown in FIG. 5, the Fresnel lens layer 212 is configured as a linear Fresnel lens in which a plurality of prisms having a substantially triangular cross section are arranged in parallel. Note that. The Fresnel lens layer 212 may be configured as a circular Fresnel lens. The Fresnel lens layer 212 is formed of a light-transmitting resin such as an acrylic resin, a polyester resin, a polyethylene resin, a polycarbonate resin, or a polyethylene terephthalate resin.

The base material layer 213 is a layer for supporting the diffusion layer 211 and the Fresnel lens layer 212. The base material layer 213 is formed from, for example, polyethylene terephthalate resin.
The 1st screen sheet 21 comprised by the said each layer is formed in the thickness of about 0.31-0.36 mm as a whole.

  The second screen sheet 22 is an optical sheet that diffuses the image light projected on the first screen sheet 21 toward the observation side. The second screen sheet 22 has a function of increasing the contrast of the image light incident from the first screen sheet 21 side and diffusing the image light toward the observation side. The second screen sheet 22 is disposed on the front surface side (opening 12a side) of the screen 20.

As shown in FIG. 6, the second screen sheet 22 includes a light control layer 221, an adhesive layer 223, a diffusion layer 222, a coloring layer 225, and a hard coat layer 224 in order from the image light incident side.
The light control layer 221 is a layer that scatters image light incident from the first screen sheet 21 side and emits the light toward a wide range in the vertical direction (Z direction) and the horizontal direction (X direction). The light control layer 221 includes a light transmission part 221a and a light absorption part 221b.

  The light transmission part 221a is a part that transmits incident video light. The light transmission parts 221a extend along the horizontal direction (X direction) of the screen, and are arranged in a plurality along the vertical direction (Z direction) of the screen. As shown in FIG. 6, the light transmission part 221 a has a cross-sectional shape in the thickness direction (Y direction) of the second screen sheet 22 with the light exit side as the upper base and the light incident side and the lower base (the light output side is short). The trapezoidal shape is such that the side and the light incident side are long sides. A base material layer (not shown) is formed on the light incident surface side of the light transmission part 221a.

  The light absorption part 221b is a part that reflects part of incident light and absorbs stray light. As shown in FIG. 6, the light absorption part 221b is formed in the trough part between the adjacent light transmission parts 221a. The light absorption part 221b is colored. The light absorption part 221b is made of a material having a refractive index smaller than that of the light transmission part 221a. The light absorbing portions 221b extend along the horizontal direction (X direction) of the screen, and as shown in FIG. 6, a plurality of light absorbing portions 221b are arranged along the vertical direction of the screen (Y direction).

  As shown in FIG. 6, the light absorbing portion 221 b has a wedge shape in cross section in the thickness direction (Y direction) of the second screen sheet 22. Here, the wedge shape refers to a shape in which one end is wide and gradually narrows toward the other, and includes a triangle, a trapezoid, and the like. In the light absorbing portion 221b, the wedge-shaped slope portion becomes a total reflection surface of the image light. The image light totally reflected by the slope portion of the light absorbing portion 221b is emitted to the diffusion layer 222 side. In the light absorbing portion 221b of the present embodiment, the angles θ1 (upper side) and θ2 (lower side) of the wedge-shaped slope portion with respect to the perpendicular in the thickness direction (Y direction) of the light control layer 221 are the same.

The diffusion layer 222 is a layer that further diffuses the image light diffused in the vertical direction of the screen by the light control layer 221. The diffusion layer 222 is bonded to the light control layer 221 through the adhesive layer 223.
The hard coat layer 224 is a layer that protects the surface of the second screen sheet 22 by increasing its hardness. In the hard coat layer 224 of this embodiment, the light output side of the image light is a mirror surface, but may be a diffusion surface depending on the application. The hard coat layer 224 is formed by, for example, a cured product of a curable resin composition. Note that an antiglare layer or an antireflection layer may be provided instead of the hard coat layer 224.

The colored layer 225 has a function of an external light absorption layer and is a layer for improving contrast. The colored layer 225 is formed of, for example, a styrene methacrylic acid copolymer. The diffusion layer 222, the hard coat layer 224, and the coloring layer 225 are configured as an integral diffusion plate. This diffusion plate is formed to a thickness of about 1.6 mm.
The second screen sheet 22 composed of the above layers is formed to a thickness of about 2 mm as a whole.
The opposing sheet surfaces of the first screen sheet 21 and the second screen sheet 22 are joined to each other by a double-sided adhesive tape (not shown) disposed in one place at a substantially central portion of the lower side (lower long side). Yes.

In the transmissive screen 20 configured as described above, when image light is projected from the projector 30 toward the first screen sheet 21, the image light is imaged on the diffusion layer 211 of the first screen sheet 21. The light is refracted by the Fresnel lens layer 212 to the optimum light exit angle, and is emitted to the second screen sheet 22 side.
The image light emitted from the first screen sheet 21 is scattered by the light control layer 221 of the second screen sheet 22 and emitted from a wide range in the vertical direction (Z direction) and the horizontal direction (X direction). The image light emitted from the light control layer 221 is displayed as an image on the light exit surface of the second screen sheet 22.

The first screen sheet 21 and the second screen sheet 22 of the present embodiment are formed to have an aspect ratio of approximately 1:21 in the case of a flat plate shape. For example, when the horizontal dimension (dimension in the horizontal direction of the screen) of each sheet is 1198 mm and the vertical dimension (dimension in the vertical direction of the screen) is 57 mm, the aspect ratio is approximately 1:21. The aspect ratio of each lens sheet is preferably in the range of 1: 5 to 1:25.
The projection display device 1 including such a long and narrow rectangular screen 20 is installed on a display shelf of goods in a retail store, for example. On the screen 20, an image relating to product information such as a description and a price regarding the product arranged on the display shelf is displayed by image light.

  The image displayed on the screen 20 can be viewed from the front of the projection display device 1 as shown in FIG. In addition, since the front frame portion 12 of the housing 10 has a two-dimensional curved surface shape that is convex toward the image light emission side, the observer can view the side of the opening 12a or the side as shown in FIG. A part of the image displayed on the screen 20 can be viewed from an oblique direction.

  The projector 30 is a device that projects image light to the back side of the screen 20. The image light projected from the projector 30 is projected onto the sheet surface of the first screen sheet 21. The image light projected on the sheet surface of the first screen sheet 21 is diffused toward the observation side in the second screen sheet 22 and forms an image on the screen surface of the screen 20. The observer can view the image light projected on the screen 20 from the opening 12a formed on the front side of the housing 10. In the present embodiment, the projector 30 is disposed so that the optical axis of the image light coincides with the axis of the screen 20 (a line orthogonal to the center of the projection surface).

Next, the shape of the screen holding groove 13 formed in the bezel portion 11 and the attachment of the screen 20 to the bezel portion 11 will be described.
FIG. 7 is a schematic diagram for explaining the shape of the screen holding groove 13 formed in the bezel portion 11. FIG. 8 is a diagram illustrating a procedure for attaching the screen 20 to the bezel portion 11. FIG. 8A is a cross-sectional view illustrating a procedure for attaching the screen 20 to the bezel portion 11. FIG. 8B is a partial cross-sectional view of FIG.

  As shown in FIG. 7, the screen holding groove 13 has image light centered around an axis B orthogonal to the optical axis A of the image light projected from the projector 30 (not shown) on the XY plane. Are formed so as to have a two-dimensional arc shape that is convex toward the emission side. The two-dimensional arc shape is formed to be an arc having a radius r centered on the axis B. The radius r is preferably in the range of 0.6 to 1.8 when the width W when the opening 12a formed in the bezel portion 11 is viewed from the front is 1.

  In the case of the screen 20 installed on a display shelf or the like of the product as in the present embodiment, the radius r is assumed to be in the range of 300 to 1000 mm, for example. In this case, the protruding amount L (see FIG. 1C) is 10 to 350 mm, and the screen width is about 265 to 1300 mm. When the radius r of the screen 20 is set in the above range and the screen width in the X direction is wider than 740 mm, the first screen sheet 21 (screen 20) of the present embodiment is improved in order to improve the overall luminance balance of the screen. As described above, it is desirable that the configuration includes the Fresnel lens layer 212.

  Thus, as shown in FIG. 7, the screen holding groove 13 is curved along the horizontal direction and has a two-dimensional arc shape that protrudes toward the image light emission side. Therefore, when the flat screen 20 is fitted into the screen holding groove 13, the screen 20 is curved along the shape of the screen holding groove 13 as shown in FIG. 3. As a result, the screen 20 is curved along the horizontal direction and has a two-dimensional arc shape that protrudes toward the image light emission side.

  To attach the screen 20 to the bezel portion 11, as shown in FIG. 8A, the screen 20 is inserted from the back side of the housing 10, and the lower side of the screen 20 is fitted into the screen holding groove 13 of the bezel portion 11. . Next, the screen holding frame 14 is inserted from the back side of the housing 10 and brought into contact with the back side of the screen 20.

Next, as shown in FIG. 8B, a spacer 142 is sandwiched between the screen holding frame 14 and the bezel portion 11 at an end portion (one of four corners described later) of the screen holding frame 14. Then, a screw 141 is inserted into a hole (not shown) formed in the outer frame portion 14b of the screen holding frame 14, and a female screw (not shown) formed inside the bezel portion 11 (front frame portion 12). The screen holding frame 14 can be fixed to the bezel part 11 by fitting and fastening. The screws 141 are attached to the four corners of the screen holding frame 14 as shown in FIG.
Thereby, the screen 20 can be held by the bezel portion 11 in a state where the four sides of the screen 20 and the outer frame portion 14b (see FIG. 2) of the screen holding frame 14 are in contact with each other.
The structure for attaching the screen holding frame 14 to the bezel portion 11 is not limited to the above example. For example, you may connect between the screen holding frame 14 and the bezel part 11 using a L-shaped metal fitting.

  In this way, the screen 20 can be held in the bezel portion 11 (housing 10) by fitting the screen 20 into the screen holding groove 13 and fixing the back side thereof with the screen holding frame 14. As shown in FIG. 6, the screen holding groove 13 has a two-dimensional arc shape that protrudes toward the image light emission side. Therefore, the flat screen 20 is fitted in the screen holding groove 13, so that the same image is obtained. It becomes a two-dimensional arc shape that is convex on the light exit side. Further, by making the thickness of the spacer 142 the same as the screen 20 or about 0.1 to 0.5 mm thick, excessive restraint of the screen 20 by the screen holding frame 14 is suppressed. The upper side can be held in a stretchable state.

As described above, in the projection display device 1 of the present embodiment, the screen 20 has a two-dimensional arc shape that is convex toward the image light emission side. Therefore, the observer can visually recognize the image displayed on the screen 20 not only from the front surface of the projection display device 1 but also from the side surface direction and the vertical direction. Moreover, since the screen 20 has the same curved surface in the horizontal direction of the screen, a more uniform image can be displayed. Therefore, in the screen 20 of this embodiment, the visibility of the displayed image can be further improved.
Moreover, since the projection type display apparatus 1 provided with the screen 20 of this embodiment can improve the visibility of the image displayed more, it can heighten the appeal effect of the goods with respect to a customer.

  In the screen 20 of the present embodiment, the second screen sheet 22 diffuses image light in a wide range in the vertical direction (Z direction) and the horizontal direction (X direction). Therefore, the visibility when the observer looks down at the screen 20 from the upper side (for example, the lower stage of the display shelf) or when looking up from the lower side (for example, the upper stage of the display shelf) can be improved. The second screen sheet 22 includes a light absorbing portion 221b having a trapezoidal cross section and extending along the horizontal direction of the screen (X direction). According to this, since the illumination light irradiated toward the downward direction from the upper direction of the screen 20 is absorbed, the fall of the contrast of the image displayed can be suppressed.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above. The present invention can be variously modified and changed as described later, and these are also within the technical scope of the present invention. Further, the effects described in the present embodiment are merely a list of the most preferable effects resulting from the present invention, and are not limited to the effects described in the present embodiment. Further, the above-described embodiment and the modifications described later can be used in appropriate combination, but detailed description thereof is omitted.

(Deformation)
In the present embodiment, as illustrated in FIG. 6, the first screen sheet 21 of the screen 20 includes the Fresnel lens layer 212 and the second screen sheet 22 includes the light control layer 221. However, the present invention is not limited to this. . When the radius r shown in FIG. 7 exceeds 1000 mm, the first screen sheet 21 may be formed of a diffusion sheet. In this case, the first screen sheet 21 is composed of a light diffusing sheet in which a diffusing agent is mixed in a light transmissive resin such as an acrylic resin, a polyester resin, a polyethylene resin, a polycarbonate resin, or a polyethylene terephthalate resin. . As the diffusing agent, for example, organic fine particles such as acrylic resin fine particles, and inorganic fine particles such as silica fine particles can be used. As the diffusing agent, one or more of these fine particles can be contained in the resin. Even when the radius r of the screen 20 is about 300 mm, the first screen sheet 21 may be formed of a diffusion sheet when the screen width is small.

  Further, when the first screen sheet 21 is constituted by a diffusion sheet, the second screen sheet 22 may be constituted by a lenticular lens sheet provided with a plurality of cylindrical lenses. In this lenticular lens sheet, the plurality of cylindrical lenses are arranged along the screen vertical direction (Z direction) so that the longitudinal direction thereof coincides with the screen horizontal direction (X direction). Each cylindrical lens has a function of diffusing video light in the vertical direction (Z direction).

  In the present embodiment, as shown in FIG. 7, the example in which the screen holding groove 13 is formed to have a two-dimensional arc shape that protrudes toward the image light emission side has been described, but the present invention is not limited thereto. The screen holding groove 13 may be any two-dimensional curved surface that is convex toward the image light emission side. For example, the screen holding groove 13 may be formed to have a two-dimensional elliptical shape that protrudes toward the image light emission side.

  In the present embodiment, the example in which the flat screen 20 is fitted in the screen holding groove 13 to form a two-dimensional arc shape that protrudes toward the image light emission side has been described. However, the present invention is not limited to this. The screen 20 may be formed into a two-dimensional arc shape that protrudes toward the image light output side, and attached to the bezel portion 11 (housing 10) in that state.

  In the present embodiment, the example in which the screw 141 attached to the four corners of the screen holding frame 14 is fixed to the bezel portion 11 has been described, but the present invention is not limited to this. Five or more holes (not shown) for inserting screws 141 are formed in the outer frame portion 14b of the screen holding frame 14, and the screen holding frame 14 is fixed to the bezel portion 11 with the screws 141 inserted into these holes. May be. In that case, the holes are preferably formed at equal intervals in the outer frame portion 14 b of the screen holding frame 14.

In the present embodiment, as shown in FIG. 6, in the light absorbing portion 221 b of the light control layer 221 (second screen sheet 22), a wedge-shaped slope portion with respect to the perpendicular in the thickness direction (Y direction) of the light control layer 221. Although an example in which the angles θ1 (upper side) and θ2 (lower side) are the same has been described, the present invention is not limited to this. For example, when the projection display device 1 is arranged on the upper side of the display shelf, the transmitted light component can be increased by increasing the lower angle θ2, so that the observer can move the upper side of the display shelf from the lower side. Visibility when looking up can be improved. In addition, when the projection display device 1 is arranged at the lower stage of the display shelf, by reducing the upper angle θ1, more image light can be emitted upward, so that the observer can Visibility when looking down on the lower tier of the display shelf can be improved.
In the case where the projection display device 1 is arranged in the middle of the display shelf (almost at the line of sight of the observer), the angles θ1 and θ2 may be the same as in this embodiment.

  In the present embodiment, the example in which the entire screen 20 has a two-dimensional curved surface shape has been described, but the present invention is not limited to this. For example, the configuration may be such that the vicinity of the center of the screen is a flat surface, and the left and right ends of the screen are two-dimensional curved surfaces. Moreover, the screen 20 may have a three-dimensional curved surface shape in part. That is, in the screen 20, the two-dimensional curved surface shape may be formed entirely or partially.

  In the present embodiment, the projector 30 may be arranged so that the optical axis of the image light intersects the axis of the screen 20. For example, the projector 30 is arranged so that the projection port of the image light faces upward, and a mirror is installed on the back side of the screen 20 at an angle of 45 degrees. Then, the image light projected from the projector 30 may be reflected to the screen 20 side by a mirror, and the image light may be projected from the back side of the screen 20.

DESCRIPTION OF SYMBOLS 1 Projection type display apparatus 10 Housing | casing 11 Bezel part 20 Transmission type screen 21 1st screen sheet 22 2nd screen sheet 30 Projector

Claims (4)

A first screen sheet having an aspect ratio of 1: 5 to 1:25 on which image light projected from the image source is projected, and image light projected on the first screen sheet is emitted toward an observation side; A transmissive screen in which an aspect ratio of 1: 5 to 1:25 is laminated;
The laminated first screen sheet and second screen sheet have a two-dimensional curved shape that is curved along the horizontal direction and is convex on the image light emission side,
A transmissive screen characterized by The transmissive screen according to claim 1,
The first screen sheet refracts the projected image light to a desired light emission angle and emits light toward the second screen sheet;
A transmissive screen characterized by The transmissive screen according to claim 1 or 2,
The second screen sheet diffuses image light projected on the first screen sheet toward the observation side;
A transmissive screen characterized by The transmissive screen according to any one of claims 1 to 3,
A housing to which the transmissive screen can be attached;
A projector that projects image light onto the transmissive screen;
A video display device comprising:

Images