JP2014052555A - Reflective screen and stereoscopic video image display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflective screen which offers reduced crosstalk and capability to display high-quality 3D video images, and to provide a video image display system using the same.SOLUTION: A reflective screen 100 includes a lens layer 13 having a Fresnel-lens shaped back surface comprising a plurality of arrayed unit lenses 131, reflective layers 12 which are formed at least on lens surfaces 132 of the unit lenses 131 and almost specularly reflect light, and at least one optical function layer provided on an image source side of the lens layer 13. A sum of a value of pre-reflection retardation Re1 accumulated by video image light that enters the screen at an angle of 67° with respect to a normal line of the screen surface along a propagating direction thereof until the light reaches the reflective layer 12, and a value of post-reflection retardation Re2 accumulated by the video image light reflected by the reflective layer 12 along a propagating direction thereof while propagating in a direction substantially parallel with the normal line of the screen surface before exiting the screen shall be no more than 30 nm.

Description

  The present invention relates to a reflective screen and a stereoscopic video display system for reflecting and displaying projected video light.

In recent years, a reflective layer is formed on a lens layer having a linear Fresnel lens shape or a circular Fresnel lens shape in which a plurality of unit lenses are arranged in order to display the image light projected by a short focus type image projection device satisfactorily. Various screens have been developed.
In order to satisfactorily display the image light projected by such a short focus type image projection device, the surface of the lens layer having a linear Fresnel lens shape or a circular Fresnel lens shape formed by arranging a plurality of unit lenses is used. Various reflective screens and the like on which a reflective layer is formed have been developed (see, for example, Patent Document 1).

In recent years, a display device capable of displaying a stereoscopic video (3D video, 3D video) has been actively developed. As a method for displaying a stereoscopic image, a frame sequential method (active method), a passive method, and the like are widely known, and development of a liquid crystal television using these methods, a video display system including a reflective screen, and the like are also developed. Progressing.
For example, in a passive display device, right-eye and left-eye images have different polarizations and are displayed on the screen at the same time, and pass through only the right-eye and left-eye image light. By observing through the display glasses provided with, the observer can visually recognize the stereoscopic image.

JP 2008-76523 A

  When displaying a stereoscopic image by a passive method using a reflective screen including one or more resin layers having various optical functions on the image source side from the reflective layer, the thickness of each resin layer of the reflective screen in the thickness direction, etc. The polarization state of image light may change due to retardation (phase difference). Due to such a change in the polarization state, crosstalk occurs such that image light that should originally reach the right eye passes through the polarizing plate for the left eye and reaches the left eye, and it is difficult to view a good stereoscopic image. It becomes. In order to reduce crosstalk, it is necessary to reduce the retardation value of the entire reflection screen.

The reflection screen for general two-dimensional video (2D video) display that does not consider the retardation value of the resin layer generally has a large retardation value of the reflection screen. When this is used for passive stereoscopic video display, Crosstalk occurs remarkably and it is difficult to view a stereoscopic image well.
Furthermore, in the case of displaying an image with a short focus type image projection device, in addition to the thickness direction of the reflective screen (normal direction of the screen surface), retardation in an oblique direction that forms an angle with respect to the normal direction of the screen surface The value also needs to be considered.
None of the reflection screens of Patent Document 1 is used for stereoscopic image display, and no countermeasures for reducing crosstalk are taken.

  An object of the present invention is to provide a reflective screen capable of displaying good stereoscopic images with reduced crosstalk, and a stereoscopic image display system using the same.

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 and displays image light (L1, L2) including two different polarized lights projected from the image source (LS1, LS2) so as to be observable. ) And a non-lens surface (133) and a lens layer (13) having a Fresnel lens shape on the back side in which a plurality of unit lenses (131) convex on the back side are arranged, and at least the lens of the unit lens A reflection layer (12) formed on the surface and substantially regularly reflecting light, and at least one optical functional layer (15, 16, 18, 19, 21, 34, 35) disposed on the image source side with respect to the lens layer. And a pre-reflection retardation value R in the traveling direction of the image light until the image light incident on the reflection screen from a direction forming 67 ° with respect to the normal direction of the screen surface reaches the reflection layer. 1 and the post-reflection retardation value Re2 in the advancing direction of the image light from the reflection layer until it is reflected by the reflection layer, travels substantially parallel to the normal direction of the screen surface and is emitted from the reflection screen, is 30 nm or less. This is a reflective screen (100, 200, 300).
According to a second aspect of the present invention, in the reflective screen according to the first aspect, at least one of the optical functional layers is provided closer to the viewer than the lens layer (13), and the diffusing action is anisotropic. A reflective screen (100, 200) comprising an anisotropic diffusion layer (15, 16) and a base layer (14, 17) made of acrylic resin that supports the anisotropic diffusion layer (15, 16).
According to a third aspect of the present invention, in the reflective screen according to the second aspect, one of the optical functional layers is a colored layer (18, 21) colored to a predetermined density, and the colored layer has an adhesive function. Or it is a reflective screen (100, 200) characterized by having a foundation | substrate function for laminating | stacking another member on the said base material layer.
According to a fourth aspect of the invention, in the reflective screen according to the first aspect, one of the optical functional layers is an acrylic resin diffusion layer (34) containing a diffusion material for diffusing light. A reflective screen (300).
The invention according to claim 5 is the reflective screen according to claim 1 or 4, wherein one of the optical functional layers is a colored layer (35) made of acrylic resin colored to a predetermined density, A reflective screen (300) characterized by:
According to a sixth aspect of the present invention, in the reflective screen according to any one of the first to fifth aspects, a light absorbing layer (11) that absorbs light is formed at least on the non-lens surface (133). It is the reflective screen (100, 200, 300) characterized by having been carried out.

The invention of claim 7 is the reflection screen (100, 200, 300) according to any one of claims 1 to 6, the first polarized light which is the first video light (L1), and The second image light (L2) that is a second polarized light having a polarization direction different from the first polarized light, and the image source (LS1, LS2) that projects the second polarized light on the reflecting screen, and the reflected light from the reflecting screen. A first image transmission unit (41) that transmits the first polarized light and is reflected by the reflective screen but does not transmit the second polarized light; and the second polarized light that is reflected by the reflective screen and transmits the second polarized light. A second image transmission unit (42) that does not transmit the first polarized light reflected by the second image transmission unit in front of one eye of an observer (O). Is placed in front of the other eye of the viewer The first polarized light transmitted through the first video transmission unit reaches one eye of the observer, and the second polarized light transmitted through the second video transmission unit is transmitted to the other of the viewer A stereoscopic image display system (1) comprising polarized glasses (40) that reach the eyes.
An eighth aspect of the present invention is the stereoscopic video display system according to the seventh aspect, wherein the video source is a first video source (LS1) that projects the first polarized light (L1) onto the reflective screen; A stereoscopic video display system (1) comprising: a second video source (LS2) that projects two polarized lights (L2) onto the reflective screen.

  ADVANTAGE OF THE INVENTION According to this invention, it can be set as the reflective screen which can reduce a crosstalk, and can display a favorable 3D image | video, and a stereo image display system using the same.

It is a figure explaining the video display system 1 of 1st Embodiment. It is a figure explaining the layer structure of the reflective screen 100 of 1st Embodiment. It is a figure explaining the 1st anisotropic diffusion layer 16 and the 2nd anisotropic diffusion layer 15. FIG. It is a figure explaining the lens layer. It is a figure explaining the layer structure of the reflective screen 200 of 2nd Embodiment. It is a figure explaining the layer structure of the reflective screen 300 of 3rd Embodiment. It is a figure explaining the evaluation method of the reflective screen of each Example and a comparative example.

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 terms “plate”, “sheet”, “film” and the like are used, but these are generally used in the order of thickness, “plate”, “sheet”, “film”. I am using 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.
Furthermore, the screen surface indicates a surface in the planar direction of the reflective screen when viewed as the entire reflective screen, and is used as the same definition in the present specification and claims. Yes.

(First embodiment)
FIG. 1 is a diagram illustrating a video display system 1 according to the first embodiment. 1A is a perspective view of the video display system 1, FIG. 1B is a side view of the video display system 1, and FIG. 1C is a plan view of the video display system 1. .
The video display system 1 is a passive stereoscopic video display system having a reflective screen 100, video sources LS1, LS2, and the like.
In the video display system 1 of the present embodiment, the video source LS1 is the left-eye video light L1 that displays the left-eye video, and the video source LS2 is the right-eye video light L2 that displays the right-eye video. Are projected on the reflection screen 100, and the reflection screen 100 reflects the image on the screen. The image lights L1 and L2 have different polarizations. The observer O wears the polarizing glasses 40 including the right-eye transmission part 42 that transmits the right-eye video light L2 and the left-eye transmission part 41 that transmits the left-eye video light L1. Is observed as a 3D video (stereoscopic video, 3D video).

In this video display system 1, when video light for displaying 2D video (2D video) is projected from one video source (for example, video source LS1) onto the reflective screen 100, the reflective screen A 2D image is displayed on the 100 screen. Therefore, this video display system 1 can also be used as a general video display system that displays 2D video.
The video display system 1 can also be used as a front projection television system or the like.

  The video sources LS <b> 1 and LS <b> 2 are devices that project left-eye video light L <b> 1 and right-eye video light L <b> 2 having different polarizations onto the reflection screen 100. The video sources LS1 and LS2 are short focus type projectors, and when the screen of the reflection screen 100 is viewed from the normal direction (normal direction of the screen surface) in the use state, It is arranged at a position near the center and below the screen (display area) of the reflective screen 100.

The image sources LS1 and LS2 are arranged such that the distance from the reflection screen 100 in the direction orthogonal to the screen of the reflection screen 100 (thickness direction of the reflection screen 100) is much closer than the conventional general-purpose projector. Can be projected. That is, the image sources LS1 and LS2 have a shorter projection distance to the reflection screen 100 and a larger incident angle of the image light L1 and L2 with respect to the reflection screen 100 than a conventional general-purpose projector.
As such video sources LS1 and LS2, for example, a short focus type liquid crystal projector or the like can be used, and a CRT type projector or the like provided with a polarizing plate (not shown) at the output portion of the video light is used. May be.
In the present embodiment, an example in which two video sources are used has been described. However, the present invention is not limited to this. A mode in which two video light projection units are provided in one video source or a single video source. Alternatively, the left-eye video light L1 and the right-eye video light L2 may be projected from one video light projection unit.

The left-eye video light L1 and the right-eye video light L2 of this embodiment are both linearly polarized light, and their polarization directions are orthogonal to each other. The left-eye video light L1 and the right-eye video light L2 have different viewing angles.
The right-eye transmission unit 42 of the polarizing glasses 40 transmits the right-eye video light L2 reflected by the reflection screen 100, but does not transmit the left-eye video light L1 reflected by the reflection screen 100. The left eye transmission unit 41 of the polarizing glasses 40 transmits the left eye image light L <b> 1 reflected by the reflection screen 100, but does not transmit the right eye image light L <b> 2 reflected by the reflection screen 100. As described above, when the left-eye video light L1 and the right-eye video light L2 are linearly polarized light, the left-eye transmission unit 41 and the right-eye transmission unit 42 each include a polarizing plate, The polarization directions of the polarized light that can be transmitted are orthogonal to each other.

When the observer O wears such polarizing glasses 40, the left eye image light L1 reflected by the reflection screen 100 reaches the left eye of the observer O, and the reflection screen is applied to the right eye. The right-eye image light L <b> 2 reflected at 100 arrives. Accordingly, since the left eye of the observer O observes only the left-eye image, and the right eye observes only the right-eye image, the observer O views the image displayed on the reflective screen 100 as a stereoscopic image ( 3D video).
The left-eye video light L1 and the right-eye video light L2 may be circularly polarized light (clockwise circularly polarized light or counterclockwise circularly polarized light) having different rotation directions, elliptically polarized light, or the like. For example, when the left-eye video light L1 and the right-eye video light L2 are circularly polarized light having different rotation directions, the right-eye transmission unit 42 and the left-eye transmission unit 41 transmit only each circularly polarized light. A circularly polarizing plate may be used.

The reflective screen 100 is a screen that reflects the image lights L1 and L2 projected by the image sources LS1 and LS2 toward the viewer O and displays an image. In the use state, the observation screen of the reflection screen 100 of the present embodiment has a substantially rectangular shape in which the long side direction is the left-right direction of the screen when viewed from the observer O side.
In the following description, unless otherwise specified, the screen vertical direction, screen horizontal direction, and thickness direction are the screen vertical direction (vertical direction) and screen horizontal direction (horizontal direction) when the reflective screen 100 is used. The thickness direction (depth direction) is assumed.
The reflective screen 100 is provided with a flat support plate 50 on the back side thereof via a bonding layer (not shown) made of an adhesive material or the like, and the support plate 50 maintains its flatness. . However, the present invention is not limited to this, and the reflective screen 100 may be supported by a frame member (not shown) or the like and maintain its flatness.
The reflective screen 100 has a large screen (display area) such as a diagonal of 80 inches and a diagonal of 100 inches.

FIG. 2 is a diagram illustrating the layer configuration of the reflective screen 100 according to the first embodiment.
In FIG. 2, it passes through a point C (see FIG. 1) that is the geometric center (screen center) of the observation screen (display region) of the reflective screen 100, is parallel to the vertical direction of the screen, and is orthogonal to the screen surface (thickness). A part of a cross section parallel to the direction is shown enlarged.
The reflective screen 100 includes a surface layer 19, a colored primer layer 18, a first base material layer 17, a bonding layer 20 a, a first anisotropic diffusion layer 16, and a bonding layer in order from the image source side (observer side) in the thickness direction. 20c, the second anisotropic diffusion layer 15, the bonding layer 20b, the second base material layer 14, the lens layer 13, the reflection layer 12, the light absorption layer 11, and the like, which are laminated integrally.

The surface layer 19 is a layer that is formed on the outermost surface on the image source side of the reflective screen 100 and has various functions for improving the optical performance, quality, durability, and the like of the reflective screen 100.
The surface layer 19 of the present embodiment is provided on the image source side (observer O side) of the first base material layer 17 via the colored primer layer 18, and reduces scratches on the image source side surface of the reflective screen 100. It has a hard coat function, an anti-glare function, and a function to prevent image light from being reflected on the ceiling. The surface layer 19 is not limited to the above example, and may have one or more appropriate functions such as an antireflection function, an ultraviolet absorption function, an antifouling function, an antistatic function, and a touch panel function.
The surface layer 19 of the present embodiment is formed by applying and curing an ionizing radiation curable resin having a hard coat function, and has a fine uneven shape (matt shape) on the surface. The thickness of the surface layer 19 can be about 1 to 25 μm, but may be thicker depending on the desired optical performance and the like.

The colored primer layer 18 is provided between the surface layer 19 and the first base material layer 17.
The colored primer layer 18 is a layer that serves as a primer (base) for forming the surface layer 19 on the surface of the first base material layer 17 on the image source side. It has a function to improve adhesion. Further, the colored primer layer 18 is colored by containing a dark pigment or dye such as gray or black so as to have a predetermined transmittance, and unnecessary illumination light or the like incident on the reflective screen 100 is unnecessary. It has a function of improving the contrast of an image by absorbing outside light or further reducing the black luminance of a displayed image.
The colored primer layer 18 is, for example, a coating film having a thickness of about 1 to 20 μm, and can be formed of a polyester resin containing a dye or a pigment, an epoxy resin, a urethane resin, an acrylic resin, or the like. Further, the light transmittance of the colored primer layer 18 is preferably 50 to 80%.

The first base material layer 17 is a layer that supports the first anisotropic diffusion layer 16 and has a function of increasing the rigidity thereof, and also has a function of increasing the rigidity of the reflective screen 100.
The 1st base material layer 17 is a resin-made sheet-like member which has a light transmittance, and has laminated | stacked the 1st anisotropic diffusion layer 16 on the surface at the back side through the joining layer 20a.
The first base material layer 17 is preferably made of an acrylic resin from the viewpoint of reducing the retardation value of the reflective screen 100. As an acrylic resin used for the 1st base material layer 17, PMMA (polymethyl methacrylate) etc. can be used, for example. Although this 1st base material layer 17 is based also on the screen size of the reflective screen 100, it is made from the above acrylic resins, and can use the sheet-like member about 30-100 micrometers in thickness.
The first base material layer 17 is formed by a cast molding method, and has a retardation value in a normal direction (thickness direction) of the screen surface and a direction that forms an angle with respect to the normal direction, such as PC (polycarbonate) or MBS ( It is characterized by being smaller than other thermoplastic resins such as (methyl methacryl / butadiene / styrene) resin.

The first anisotropic diffusion layer 16 and the second anisotropic diffusion layer 15 will be described.
In the first anisotropic diffusion layer 16 and the second anisotropic diffusion layer 15, light incident at an incident angle within a specific angle range with respect to one surface is diffused and emitted from the other surface. Light incident at other incident angles has a characteristic of exiting from the other surface as it is without diffusing.
The first anisotropic diffusion layer 16 and the second anisotropic diffusion layer 15 have a thickness of 40 to 200 μm and are made of an ultraviolet curable resin.
A second anisotropic diffusion layer 15 is integrally bonded to the back side of the first anisotropic diffusion layer 16 via a bonding layer 20c.

FIG. 3 is a diagram illustrating the first anisotropic diffusion layer 16 and the second anisotropic diffusion layer 15. FIG. 3A is a view for explaining the diffusion action in a cross section that is parallel to the first direction 16J parallel to the first anisotropic diffusion layer 16 and orthogonal to the screen surface, and FIG. FIG. 4 is a diagram showing a first direction 16J of the first anisotropic diffusion layer 16 and a first direction 15J of the second anisotropic diffusion layer 15 as seen from the front direction of the screen. In FIG. 3A, in order to facilitate understanding, in the first direction 16J, the right side of the drawing is shown as the + side and the left side of the drawing is shown as the − side.
The first anisotropic diffusion layer 16 has a first direction 16J parallel to the surface thereof and includes light incident at an incident angle within a predetermined angle range from one surface within a plane perpendicular to the screen surface. The light diffused and emitted to the other surface and incident at an incident angle other than that has an diffusing action having anisotropy of being transmitted without being diffused and emitted from the other surface.

As shown in FIG. 3A, the first anisotropic diffusion layer 16 has a surface normal direction (in the normal direction of the screen surface) in a plane including the first direction 16J and orthogonal to the screen surface. The light L4 incident at an incident angle within an angle range A1 in which the angle θ1 to θ2 (where θ2> θ1) is set to the + side with respect to the (parallel direction) H is an angle range D1 (normal line) on the other surface side. The light is diffused and emitted in the minus side of H from the angle θ1 to the angle θ2. However, the light L5 and L6 incident at an incident angle in the other angle ranges B1 and C1 are transmitted without being diffused and emitted into the angle ranges E1 and F1 of the other surface.
Further, light incident on the first anisotropic diffusion layer 16 at an incident angle within the angle range D1 from the other surface side is an angle range A1 (a range from the angle θ1 to the angle θ2 on the minus side with respect to the normal H). ) Diffused and emitted. Light incident at an incident angle within the other angular ranges E1 and F1 is transmitted without being diffused and emitted into the angular ranges B1 and C1.

Further, the second anisotropic diffusion layer 15 is anisotropic in the same plane as the first anisotropic diffusion layer 16 in the plane including the first direction 15J parallel to the surface and perpendicular to the screen surface. Has a diffusing action, but the angular range is different.
The second anisotropic diffusion layer 15 has a first direction 15J and is perpendicular to the screen surface (corresponding to the cross section shown in FIG. 3A). The incident angle range in which the diffusion action is emitted and the angle range in which the light is diffused and emitted are symmetric with respect to the normal line H with respect to the angle ranges A1 and D1 of the first anisotropic diffusion layer 16 described above.
The second anisotropic diffusion layer 15 of this embodiment is the same member as the first anisotropic diffusion layer 16 described above, and the screen vertical direction is the first anisotropic diffusion layer while maintaining the screen horizontal direction. It is arranged with its front and back sides reversed so as to be opposite to the arrangement of 16.

Therefore, the second anisotropic diffusion layer 15 is in the negative direction with respect to the normal direction (direction parallel to the normal direction of the screen surface) H in a plane including the first direction 15J and orthogonal to the screen surface. Light incident at an angle of incidence within an angle range of angle θ1 to angle θ2 (where θ2> θ1) is within a range of angle θ1 to angle θ2 on the + side with respect to the normal H on the other surface side. The light is emitted after being diffused. However, light incident at an incident angle within the other angle range is transmitted without being diffused and emitted to the other surface side. In addition, on the other surface side, the light incident in the range from the angle θ1 to the angle θ2 on the + side with respect to the normal direction H becomes the angle θ1 to the angle θ2 on the − side with respect to the normal direction H. Light that is diffused and emitted within the angular range and incident at an incident angle within the other angular range is transmitted and emitted without being diffused.
In the present embodiment, for example, the first anisotropic diffusion layer 16 and the second anisotropic diffusion layer 15 both have an angle θ1 = −15 ° and an angle θ2 = + 15 °.

In the present embodiment, the first direction 16J of the first anisotropic diffusion layer 16 and the first direction 15J of the second anisotropic diffusion layer 15 are as shown in FIG. With respect to the straight line T parallel to the horizontal direction of the screen, the right edge of the screen is arranged so as to form an angle φ on the upper side of the screen and an angle φ (0 ° <φ <90 °) on the lower side of the screen. Yes.
By adopting such an arrangement, the first anisotropic diffusion layer 16 and the second anisotropic diffusion layer 15 can diffuse light not only in the horizontal direction of the screen but also in the vertical direction of the screen. Therefore, the reflective screen 100 can ensure a good viewing angle in the vertical direction of the screen and the horizontal direction of the screen.
In the present embodiment, for example, φ = 15 °.
Note that the angles θ1 and θ2 and the angle φ can be appropriately set according to the desired optical performance.
The first anisotropic diffusion layer 16 and the second anisotropic diffusion layer 15 are formed of a general-purpose PC resin or the like whose retardation value in the normal direction of the screen surface and the direction that forms an angle with respect to the normal direction. And smaller than an isotropic diffusion layer containing a diffusion material.

The second base material layer 14 is a layer that supports the second anisotropic diffusion layer 15 described above and has a function of increasing the rigidity thereof, and also has a function of increasing the rigidity of the reflective screen 100. The second base material layer 14 is integrally laminated on the back side of the second anisotropic diffusion layer 15 via the bonding layer 20b.
The second base material layer 14 is a resin-made sheet-like member having optical transparency, and the second anisotropic diffusion layer 15 is laminated on the surface on the image source side through the bonding layer 20b. . The second base material layer 14 can use the same member as the first base material layer 17 described above.

  The bonding layers 20a, 20b, and 20c are respectively the first base material layer 17 and the first anisotropic diffusion layer 16, the second anisotropic diffusion layer 15 and the second base material layer 14, and the first anisotropic diffusion layer. 16 is a layer having a function of integrally bonding the second anisotropic diffusion layer 15 and the second anisotropic diffusion layer 15. For the bonding layers 20a, 20b, and 20c, an adhesive that develops adhesiveness in response to ultraviolet light or heat, an adhesive that develops adhesiveness by pressure, or the like can be used. Note that an adhesive may be used as the bonding layer. As such a bonding layer, an acrylic resin, a urethane resin, an epoxy resin, or the like can be used.

In the present embodiment, in the thickness direction of the reflective screen 100, the first base material layer 17, the first anisotropic diffusion layer 16, the second anisotropic diffusion layer 15, and the second base material are sequentially arranged from the image source side. Although the example arrange | positioned with the layer 14 was given and demonstrated, it is not restricted to this, The position of the 1st base material layer 17 and the 1st anisotropic diffusion layer 16 in the thickness direction, the 2nd anisotropic diffusion layer 15 and the 1st You may replace the position with 2 base material layers 14 suitably.
For example, if the first base material layer 17 has sufficient rigidity, the second base material layer 14 may not be provided.

FIG. 4 is a diagram illustrating the lens layer 13.
The lens layer 13 is a light-transmitting layer provided on the back side of the second base material layer 14 and has a Fresnel lens shape on the back side.
4A, the lens layer 13 of the present embodiment has a circular Fresnel lens shape in which a plurality of unit lenses 131 are arranged concentrically around the point F. A point F that is an optical center (Fresnel center) of the circular Fresnel lens shape formed by arranging the unit lenses 131 is on a straight line passing through the center of the screen (display area) of the reflective screen 100 in the left-right direction. It is located outside the screen area and below the reflective screen 100.
In the present embodiment, the lens layer 13 will be described with an example having a circular Fresnel lens shape, but may have a linear Fresnel lens shape.

As shown in FIG. 4B, the unit lens 131 is parallel to the direction orthogonal to the screen surface (thickness direction of the reflective screen 100) and has a cross-sectional shape in a cross section parallel to the arrangement direction of the unit lenses 131. It is substantially triangular.
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 cross section shown in FIG. 4B, the lens surface 132 of the unit lens 131 is positioned above the non-lens surface 133 in the vertical direction when the reflection screen 100 is used.
In the unit lens 131, as shown in FIG. 4B, the angle formed by the lens surface 132 and the surface parallel to the screen surface is α, and the angle formed by 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 FIGS. 2 and 4 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 lenses 131 of the present embodiment actually have a constant arrangement pitch P and the like, but the angle α gradually increases as the distance from the point F that becomes the Fresnel center in the arrangement direction of the unit lenses 131 increases.
The angle α and the like are not limited to the above-described example, and the arrangement pitch P may be gradually changed along the arrangement direction of the unit lenses 131, and the video source LS that projects the video light. Desired according to the size of the pixel, the projection angle of the image source LS (the incident angle of the image light on the screen surface of the reflection screen 100), the screen size of the reflection screen 100, the refractive index of each layer, and the use environment It can be appropriately changed according to the optical characteristics 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 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. As shown in FIGS. 2 and 3B, the reflective layer 12 of the present embodiment is formed on the lens surface 132, but not on the non-lens surface 133.
The reflective layer 12 preferably reflects light regularly (specular reflection) so as not to change the polarization state by changing the polarization plane of the image light during reflection.
The reflective layer 12 can be formed on the lens surface 132 by evaporating or sputtering a metal such as aluminum, silver, or nickel.

The light absorption layer 11 is provided on the back side of the lens layer 13 and the reflection layer 12 and has a function of absorbing light. The light absorption layer 11 of the present embodiment covers the reflection layer 12 and the non-lens surface 133, and the light absorption layer 11 is formed on the non-lens surface 133.
The light-absorbing layer 11 is made of, for example, a thermosetting resin or an ultraviolet-curing resin containing a dark-colored paint such as black, a dark-colored pigment or dye such as black, and a bead having a light-absorbing action. Is applied to the back side (Fresnel lens shape side) of the lens layer 13 formed on the lens surface 132 and cured.

Here, returning to FIG. 2, the state of the image light and the external light incident on the reflection screen 100 of the embodiment will be described. For easy understanding, the surface layer 19, the colored primer layer 18, the first base material layer 17, the first anisotropic diffusion layer 16, the second anisotropic diffusion layer 15 and the second base material of the reflective screen 100 are shown. It is assumed that the refractive indexes of the layer 14 and the lens layer 13 are the same, and regarding the image light, the left-eye image light L1 and the right-eye image light L2 are collectively described as the image light L3.
As shown in FIG. 2, most of the image light L3 projected from the image source enters from below the reflective screen 100, passes through the surface layer 19 and the first base material layer 17, and is subjected to the first anisotropic diffusion. The light is diffused in the screen up-down direction and the screen left-right direction by the layer 16 and the second anisotropic diffusion layer 15, passes through the second base material layer 14, and enters the unit lens 131 of the lens layer 13.

  Then, the image light L3 enters the lens surface 132, is reflected by the reflective layer 12, travels toward the viewer O side, and again in the first anisotropic diffusion layer 16 and the second anisotropic diffusion layer 15. The light is diffused in the vertical direction of the screen and the screen direction, and is emitted from the reflective screen 100. The angle β (see FIG. 3B) is larger than the incident angle of the image light L3 at each point in the vertical direction of the screen of the reflection screen 100 when the image light L3 is projected from below the reflection screen 100. The image light L3 does not directly enter the non-lens surface 133, and the non-lens surface 133 does not affect the reflection of the image light L3.

On the other hand, unnecessary external lights G1 and G2 such as illumination light are mainly incident from above the reflection screen 100 and transmitted through the surface layer 19 and the like, as shown in FIG. 2 is diffused by the anisotropic diffusion layer 15 and enters the unit lens 131 of the lens layer 13.
A part of the external light G1 enters the non-lens surface 133 and is absorbed by the light absorption layer 11. Further, 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 100, so that it does not reach the observer O side directly. Significantly less than the image light L3. Therefore, in the reflective screen 100, the contrast reduction of the image | video by external light G1, G2 can be suppressed.
From the above, according to the reflective screen 100 of the present embodiment, a bright and good video can be displayed even in a bright room environment.

Here, in a passive 3D image display system that projects polarized light as image light on a reflection screen, the phase difference given to image light transmitted through the reflection screen, that is, the retardation value of the reflection screen is small. This is preferable from the viewpoint of maintaining the polarization state and reducing crosstalk.
As shown in the video light L3 of FIG. 2 described above, the video light L3 makes a large angle (about 40 ° to 80 °) with respect to the reflective screen 100 in the vertical direction of the screen with respect to the normal direction of the screen surface. The light enters from the direction, passes through the reflection screen 100 and is reflected by the reflection layer 12, travels substantially parallel to the normal direction of the screen surface toward the image source side, and exits from the reflection screen 100.

  That is, the retardation value Re of the reflective screen 100 is incident in a direction in which the image light that is transmitted through the reflective screen 100 travels from the direction that forms an angle γ with respect to the normal direction to the screen surface and reaches the reflective layer 12. Retardation value (retardation value before reflection) Re1 and retardation value in the direction in which the light reflected by the reflection layer 12 travels in parallel with the normal direction of the screen surface before exiting from the surface layer 19 (retardation value after reflection) This corresponds to the sum of Re2 (total retardation value). From the viewpoint of reducing crosstalk, the retardation value Re is preferably 30 nm or less, more preferably 20 nm or less, for light having a wavelength of 587 nm.

The light with a wavelength of 587 nm is a reference light of visible light (380 nm to 780 nm), and if the retardation value Re for the light with a wavelength of 587 nm is 30 nm or less, the entire wavelength range of visible light, in particular, a long wavelength in which crosstalk is easily visible. Even in the visible light (red light) on the side, crosstalk is sufficiently reduced.
When the retardation value Re is 30 nm or more, the polarization state of the image light before the reflection screen 100 is incident and the polarization state of the image light after the emission are different. Thereby, for example, a part of the image light L1 for the left eye is transmitted to the right-eye transmission part 42 and visually recognized by the right eye, and crosstalk occurs, thereby preventing good 3D image viewing. End up.

Therefore, by setting the retardation value Re (Re = Re1 + Re2) of the reflection screen at the center of the reflection screen to 30 nm or less, more preferably 20 nm, the change in the phase of the image light transmitted through the reflection screen 100 is greatly suppressed. The crosstalk caused by the change in the polarization state due to the phase change can be greatly reduced.
In the reflective screen 100 of the present embodiment, the first base material layer 17 and the second base material layer 14 are made of acrylic resin, so that the retardation value Re2 in the normal direction of the screen surface and the normal direction of the screen surface are On the other hand, the retardation value Re, which is the sum of the retardation values Re1 with respect to the traveling direction of light incident at an incident angle of 67 °, is set to 30 nm or less.

Here, the reason for setting the retardation value Re1 to the light incident angle of 67 ° on the screen surface of the reflection screen 100 is that the image from the short focus type image sources LS1 and LS2 to the reflection screen 100 as in the present embodiment. This is because the range of the incident angle of light in the vertical direction of the screen is about 40 to 80 °, and the incident angle at the point C which is the center of the screen screen is about 67 °.
From the above, according to the present embodiment, it is possible to display a good video image that is bright, has high contrast, and has greatly reduced crosstalk even in a bright room environment. In addition, since the colored layer is provided by coloring the primer layer that does not significantly affect the retardation value, the retardation value does not increase and the production is easy.

(Second Embodiment)
FIG. 5 is a diagram illustrating the layer configuration of the reflective screen 200 according to the second embodiment. FIG. 5 shows a cross section corresponding to the cross section shown in FIG.
The reflective screen 200 of the second embodiment does not include the colored primer layer 18 but differs in that it includes a transparent primer layer 28 and a colored bonding layer 21 that are not colored. 100. Accordingly, parts having the same functions as those of the reflective screen 100 according to the first embodiment described above are denoted by the same reference numerals or the same reference numerals at the end thereof, and redundant descriptions are omitted as appropriate.
The reflective screen 200 includes a surface layer 19, a transparent primer layer 28, a first base material layer 17, a colored bonding layer 21, a first anisotropic diffusion layer 16, a bonding layer 20c, and a second layer in order from the image source side in the thickness direction. The anisotropic diffusion layer 15, the bonding layer 20 b, the second base material layer 14, the lens layer 13, the reflection layer 12, and the light absorption layer 11 are provided, and these are integrally laminated. This reflective screen 200 is used in the video display system 1 in the same manner as the reflective screen 100 of the first embodiment described above.

In the reflection screen 200 of the second embodiment, the retardation value Re that is the sum of the retardation in the incident direction and the reflection direction of the image light is preferably 30 nm or less, and more preferably 20 nm or less.
The colored bonding layer 21 is a bonding layer that bonds the first base material layer 17 and the first anisotropic diffusion layer 16 and is colored in a dark color so as to have a predetermined transmittance. The colored bonding layer 21 is a pressure-sensitive adhesive, and contains the same pigment or dye as the gray or black pigment or dye contained in the colored primer layer 18 described above.

The colored bonding layer 21 is formed using an epoxy resin, an acrylic resin, or the like, and can have a thickness of 1 to 30 μm. In addition, the colored bonding layer 21 preferably has a light transmittance of 50 to 80%, similarly to the colored primer layer 18 described above.
Even in the case of the present embodiment, as in the first embodiment described above, it is possible to display a good image that is bright, has high contrast, and has significantly reduced crosstalk even in a bright room environment. In addition, since the colored layer can be provided without increasing the number of layers constituting the reflective screen 200, the retardation value of the reflective screen 200 can be reduced. Moreover, manufacture is also easy.

(Third embodiment)
FIG. 6 is a diagram illustrating the layer configuration of the reflective screen 300 according to the third embodiment. FIG. 5 shows a cross section corresponding to the cross section shown in FIG.
The reflective screen 300 of the third embodiment does not include the first base material layer 17, the first anisotropic diffusion layer 16, the second anisotropic diffusion layer 15, and the second base material layer 14, and is a transparent primer layer. The point provided with 28, the colored layer 35, and the diffused layer 34 differs from the above-mentioned 1st Embodiment. Accordingly, parts having the same functions as those of the reflective screen 100 of the first embodiment and the reflective screen 200 of the second embodiment described above are denoted by the same reference numerals or the same reference numerals at the end, and overlapping descriptions are appropriately described. Omitted.

The reflective screen 300 includes a surface layer 19, a transparent primer layer 28, a colored layer 35, a diffusion layer 34, a lens layer 13, a reflective layer 12, and a light absorbing layer 11 in order from the image source side in the thickness direction. Are stacked. The reflective screen 300 is used in the video display system 1 in the same manner as the reflective screen 100 of the first embodiment described above.
The lens layer 13 of the present embodiment is integrally formed on the back side surface of the diffusion layer 34.

The diffusion layer 34 is a layer containing a light diffusing material having a light transmissive acrylic resin as a base material.
As the base material of the diffusion layer 34, acrylic resin such as PMMA used for the first base material layer 17 and the second base material layer described above can be used. Further, as the diffusing material contained in the diffusing layer 34, resin particles such as acrylic, styrene, acrylic / styrene copolymer, inorganic particles such as silicon, and the like can be used.
The thickness of the diffusion layer 34 is preferably about 100 to 200 μm from the viewpoint of obtaining a good viewing angle while preventing image blur. At this time, the average particle diameter of the diffusing material is preferably about 1 to 30 μm, although it depends on the thickness of the diffusion layer 34.

The colored layer 35 is a resin-made layer colored with a dye or pigment such as gray or black for obtaining a predetermined transmittance. In the present embodiment, the colored layer 35 is located on the image source side (observer side) of the diffusion layer 34.
The colored layer 35 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.
As a base material of the colored layer 35, an acrylic resin such as PMMA used for the first base material layer 17 and the second base material layer described above can be used.
The colored layer 35 preferably has a light transmittance of 50 to 80%. The thickness of the colored layer 35 is preferably about 30 μm to 1.5 mm.

The colored layer 35 and the diffusion layer 34 of the present embodiment are formed by coextrusion molding and laminated integrally. In addition, it is good also as a form which makes the colored layer 35 into a single layer, and contains both a diffusing material and coloring materials, such as a pigment and dye.
In the reflection screen 300 of the third embodiment, the total retardation Re in the incident direction and the reflection direction of the image light is preferably 30 nm or less, and more preferably 20 nm or less.

In the case of this embodiment, the number of layers constituting the reflective screen can be reduced, and the retardation value Re of the reflective screen 300 can be greatly reduced.
In the first embodiment and the second embodiment, generally expensive anisotropic diffusion layers (the first anisotropic diffusion layer 16 and the second anisotropic diffusion layer 15) are used. According to the embodiment, since the anisotropic diffusion layer is not used and the diffusion layer 34 and the colored layer 35 are extruded, production cost, work time, etc. can be greatly reduced, and a more inexpensive reflective screen and can do. Furthermore, according to this embodiment, the number of layers to be stacked can be reduced, the thickness can be further reduced, and the production cost can be reduced.

Here, reflective screens corresponding to examples and comparative examples of the reflective screens 100, 200, and 300 of the embodiment were manufactured, and the retardation value, crosstalk ratio, contrast, peak gain, and the like were examined.
Example 1 corresponds to the example of the reflective screen 100 of the first embodiment, Example 2 corresponds to the reflective screen 200 of the second embodiment, and Example 3 corresponds to the reflective screen 300 of the third embodiment. . The reflective screens of these examples and comparative examples have a screen size of a diagonal size of 80 inches (1771 × 996 mm).

The layers used in each example will be described.
The surface layer 19 is made of urethane acrylate resin and has a thickness of 25 μm.
The colored primer layer 18 is made of a polyester resin, has a film thickness of 15 μm, contains a black pigment, and is colored black and transparent. The visible light transmittance of the colored primer layer 18 is about 60%.
The transparent primer layer 28 is made of a polyester resin, has a film thickness of 15 μm, and is transparent.
The first base material layer 17 and the second base material layer 14 are made of PMMA and have a thickness of 50 μm.
The first anisotropic diffusion layer 16 and the second anisotropic diffusion layer 15 are made of an ultraviolet curable acrylic resin and have a thickness of about 40 μm.

The bonding layers 20a and 20b are pressure-sensitive adhesive materials made of acrylic resin and have a thickness of 25 μm.
The colored bonding layer 21 is a pressure-sensitive adhesive material made of an acrylic resin containing a black pigment and has a thickness of 15 μm. The colored bonding layer 21 is colored black and transparent. The visible light transmittance of the colored bonding layer 21 is about 60%.
The diffusion layer 34 is made of PMMA resin containing a diffusion material (average particle size 10 μm) made of silicon resin, and has a thickness of 200 μm.
The colored layer 35 is a layer made of PMMA resin containing a black pigment and having a thickness of 38 μm, and is black and transparent. The visible layer has a visible light transmittance of about 60%.
The lens layer 13 is made of urethane acrylate resin.
The reflective layer 12 is formed by evaporating aluminum.
The light absorption layer 11 is formed by applying and curing an epoxy resin containing a black pigment.

The reflective screen of the comparative example is as follows.
The reflective screens of Comparative Examples 1 and 2 correspond to Comparative Examples of the first embodiment and the second embodiment, and both the first base material layer 17 and the second base material layer 14 are made of PC resin and have a thickness. 200 μm.
The reflective screen of Comparative Example 3 corresponds to the comparative example of the reflective screen of the third embodiment, and the base material of the colored layer 35 and the diffusion layer 34 is made of PC resin.
In Comparative Example 4, a black fabric layer (thickness: 320 μm) is provided with a resin layer (thickness: about 170 μm) on the viewer side, and a reflective layer (thickness: about 30 μm) formed of silver paint or the like on the viewer side. ).

The crosstalk rate is calculated by projecting the image light L2 (polarized light transmitted through the right-eye transmission unit 42) from the image source LS2 onto the screen, and measuring the luminance at the point C (BLIND) measured by the luminance meter through the left-eye transmission unit 41. ) And the ratio of the luminance (OPEN) at point C measured by the luminance meter through the right-eye transmission unit 42. This crosstalk rate is obtained by the following equation 1. At this time, the luminance was measured with a luminance meter (LS-110 manufactured by Konica Minolta Co., Ltd.) from a position 3 m in the normal direction from the center C of the reflective screen in a dark room environment.
Crosstalk rate = (BLIND / OPEN) × 100 (%) (Formula 1)
The crosstalk rate is preferably 5% or less, more preferably 3% or less, and even more preferably 1.5% or less, from the viewpoint of displaying a good 3D image. .

In addition, the retardation value Re as a reflective screen is a retardation value (retardation value before reflection) Re1 until image light enters the reflective screen and reaches the reflective layer, and proceeds in a substantially front direction of the screen after being reflected by the reflective layer. This corresponds to the sum of the retardation value (retardation value after reflection) Re2 until the light exits from the reflective screen.
The post-reflection retardation value Re2 is a retardation value in the thickness direction of the reflective screen (the normal direction of the screen surface). The pre-reflection retardation value Re1 corresponds to a retardation value in a direction in which light is transmitted through the reflection screen when the incident angle to the reflection screen is 67 °. These correspond to the sum of the retardation values of each layer in each direction.

Retardation values (pre-reflection retardation value Re1 and post-reflection retardation value Re2) were measured using a phase difference measuring device (KOBRA-WR Oji Scientific Instruments). Various conditions at the time of measurement are as follows.
Measurement mode: Incident angle dependence measurement Measurement method: Standard Wavelength: λ About 587 nm
Nave: 1.585
Adopted data: Recorded data of θ = 0 ° As described above, the pre-reflection retardation value Re1 is the retardation value when the incident angle of light on the reflective screen is 67 °. The incident angle of the image light from the image sources LS1 and LS2 which are the projectors of the first and second embodiments to the reflection screen of each of the embodiments and the comparative example is about 40 to 80 ° in the vertical direction of the screen, and is incident at the point C which is the center of the screen screen. This is because the angle is about 67 °.

Next, image light (white display) was actually projected from the image source LS1 on the reflective screens of the examples and comparative examples, and the peak gain (PG), ½ angle, contrast, and the like were examined. .
FIG. 7 is a diagram for explaining a method of evaluating the reflective screens of the examples and comparative examples.
First, in a dark room environment, as shown in FIG. 7, white light is emitted from the video source LS1, and d1 = 3 m with respect to the point C in a plane parallel to the horizontal direction of the screen passing through the point C that is the center of the screen. Brightness from the direction of the distance ε = 0 °, ± 10 °, ± 20 °, ± 30 °, ± 40 °, which is a position away from the normal direction (front direction) of the screen surface passing through point C The luminance at point C was measured with a meter (LS-110, manufactured by Konica Minolta). Then, from the luminance distribution in the horizontal direction of the screen obtained by the measurement, the peak gain in the horizontal direction of the screen and the half angle α in the horizontal direction of the screen were obtained.

Here, as described above, the gain means that light (white light) is projected from the image source LS1 to the reflective screens of the examples and comparative examples, and light is reflected on the reflective screens of the examples and comparative examples. The illuminance at the incident surface and the brightness of the light reflected from the reflective layer 12 and emitted from the reflective screens of the example and the comparative example are in the normal direction of the sheet surface (planar direction when viewed as the entire light diffusion layer). It is a value obtained from (Equation 1) shown below, measured at each angle. Here, the illuminance is the illuminance at point C (measured by an illuminometer (not shown) (CS-200A manufactured by Konica Minolta)), and the luminance is the luminance obtained by the above-described measurement.
G = π × K / I (Formula 1)
In (Equation 1), the gain is indicated by G, the circumference is π, the luminance is K (cd / m 2), and the illuminance is I (lx). The peak gain indicates the highest gain among the obtained gains.

  Further, the contrast is the brightness (white brightness: W) at point C, which is the center of the screen when white is displayed on the reflective screens of the examples and comparative examples in the bright room environment (illuminance at point C: 100 lx). The ratio with the luminance at point C during black display (black luminance: B). Similar to the measurement of the half angle α and the like described above, these luminances are at a position d1 = 3 m away from the point C, and are in the normal direction (front direction, ε = 0 °) and the above luminance meter (LS-110 manufactured by Konica Minolta Co., Ltd.).

  Table 1 shows the results obtained by summarizing the measurement results of the retardation value Re, crosstalk ratio, peak gain, contrast, half angle in the horizontal direction of the screen, and the like of each example and comparative example.

As shown in Table 1 above, Examples 1 to 3 have a retardation value of 30 nm or less. In particular, Examples 1 and 2 have a retardation value of around 20 nm and have a low crosstalk ratio. It was 5% or less, and the contrast and the ½ angle in the horizontal direction of the screen were sufficient as a reflective screen.
On the other hand, in the reflective screens of Comparative Examples 1 to 3, the half angle and the peak gain were sufficient, but the retardation value was higher than the preferred range, the crosstalk rate was 50% or more, and a good 3D image Was not visible. Further, in the reflective screen of Comparative Example 4, the crosstalk rate is reduced to the same extent as that of the reflective screen of Example 3, the peak gain is remarkably high, but the contrast is low and the image is unclear. The two corners were small and the viewing angle was narrow, which was insufficient.

Therefore, if the reflective screens of the first to third embodiments are used, it is possible to display a good 3D video image that is bright, has high contrast, and has greatly improved crosstalk.
Moreover, the reflective screen of Example 1 had the lowest black luminance, and the contrast was even better than the reflective screens of other Examples 2 and 3. Further, the reflective screen of Example 2 is easier to manufacture than Example 1. Moreover, the reflective screen of Example 3 is easy to manufacture, and the production cost can be greatly reduced.

(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) In the first and second embodiments, the colored layers are the colored primer layer 18 and the colored bonding layer 21. However, the present invention is not limited to this, and the primer layer and the bonding layer are transparent. The lens layer 13 may be colored.

(2) In the first embodiment and the second embodiment, the reflection screens 100 and 200 have been described as including the first anisotropic diffusion layer 16 and the second anisotropic diffusion layer 15, but the present invention is not limited thereto. For example, a third anisotropic diffusion layer and a fourth anisotropic diffusion layer may be provided by laminating together between the second anisotropic diffusion layer 15 and the second base material layer 14, for example. Good.
At this time, the first direction of the third anisotropic diffusion layer and the first direction of the fourth anisotropic diffusion layer are both parallel to the horizontal direction of the screen, and the angle range of the third anisotropic diffusion layer By setting A1 to an incident angle range of + 5 ° to + 45 ° and an angular range A1 of the fourth anisotropic diffusion layer to be −5 ° to −45 °, light can be diffused in the horizontal direction of the screen. A wide viewing angle in the left-right direction can be maintained.

(3) In each embodiment, the unit lens 131 has an example in which the cross-sectional shape illustrated in FIG. 2 or 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 light absorption layer may be formed on the top surface, or a reflection layer may be formed.
Further, the lens surface 132 and the non-lens surface 133 of the unit lens 131 may be partially curved, or at least one of them may be configured by a plurality of surfaces.

(4) In each embodiment, the reflection screens 100 to 300 include the light absorption layer 11 and the non-lens surface 133 is covered with the light absorption layer 11. The reflective layer 12 may also be formed on 133. At this time, if the thickness of the reflective layer 12 is sufficient, the light absorption layer 11 may not be provided.
In this case, the reflective layer 12 may fill the valleys between the unit lenses 131, and the back surface thereof may be substantially planar, or may have a predetermined thickness along the concave and convex shape of the unit lenses 131. The shape may be formed, or the thickness may not be uniform as long as it has sufficient reflection characteristics.

(5) In each embodiment, although the surface layer 19 showed the example which is a coating film, not only this but the member whose retardation value is sufficiently low or can be selected as a base material of the surface layer 19 can be selected. In this case, the surface layer 19 is a film-like member, and is bonded to the first base material layer 17 or the colored layer 35 via the colored primer layer 18 or the transparent primer layer 28 by a bonding layer (not shown) or the like. Also good.

(6) In each embodiment, the reflective screens 100 to 300 are bonded to the support plate 50 provided on the back side thereof via an adhesive material layer (not shown) and the like, and are substantially flat. However, not limited to this, for example, the support plate 50 is not provided, and the reflective screens 100 to 300 may 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 (1) or are hung on a wall surface by support members, such as a hook.
Moreover, in each embodiment, although the reflective screens 100-300 showed the example which is substantially flat form at the time of use and non-use, it is not restricted to this, As a form which can be wound up and can be stored at the time of non-use Also good. In the case of such a configuration, the support plate 50 or the like is not provided, and the back side of the reflection screens 100 to 300 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 also as a form to do.

(7) In the first embodiment, the video sources LS1 and LS2 are positioned below the reflective screen 100 in the vertical direction, and the video lights L1 and L2 are projected obliquely from below the reflective screen 10. For example, the video sources LS1 and LS2 may be positioned above the reflective screen 100 in the vertical direction, and the video lights L1 and L2 may be projected obliquely from above the reflective screen 100. At this time, the reflective screen 100 may have a form in which the vertical direction of the lens layer 13 shown in FIGS.
The same applies to the second embodiment and the third embodiment.

  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 embodiments described above.

DESCRIPTION OF SYMBOLS 1 Video display system 100,200,300 Reflective screen 11 Light absorption layer 12 Reflective layer 13 Lens layer 14 2nd base material layer 15 2nd anisotropic diffusion layer 16 1st anisotropic diffusion layer 17 1st base material layer 18 Colored primer layer 19 Surface layer 20a, 20b, 20c Bonding layer 21 Colored bonding layer 28 Transparent primer layer 34 Diffusion layer 35 Colored layer

Claims (8)

A reflection screen for reflecting image light including two different polarized lights projected from an image source so as to be observable;
A lens layer having a lens surface and a non-lens surface and having a Fresnel lens shape on the back side in which a plurality of unit lenses convex on the back side are arranged;
A reflective layer that is formed on at least the lens surface of the unit lens and substantially regularly reflects light;
At least one optical functional layer disposed closer to the image source than the lens layer;
With
The reflection value Re1 before reflection in the traveling direction of the image light until the image light incident from the direction forming 67 ° with respect to the normal direction of the screen surface to the reflection screen reaches the reflection layer, and reflected by the reflection layer. The sum with the post-reflection retardation value Re2 in the traveling direction of the image light that travels substantially parallel to the normal direction of the screen surface and exits from the reflecting screen is 30 nm or less,
Reflective screen featuring. The reflective screen according to claim 1.
At least one of the optical function layers is an anisotropic diffusion layer that is provided closer to the viewer than the lens layer and has an anisotropic diffusion function, and a base layer made of acrylic resin that supports the diffusion layer. Preparing,
Reflective screen featuring. The reflective screen according to claim 2,
One of the optical functional layers is a colored layer colored to a predetermined concentration,
The colored layer has an adhesive function or a base function for laminating other members to the base material layer,
Reflective screen featuring. The reflective screen according to claim 1.
One of the optical functional layers is an acrylic resin diffusion layer containing a diffusion material that diffuses light,
Reflective screen featuring. The reflective screen according to claim 1 or 4,
One of the optical functional layers is an acrylic resin colored layer colored to a predetermined concentration,
Reflective screen featuring. The reflection screen according to any one of claims 1 to 5,
A light absorption layer for absorbing light is formed at least on the non-lens surface;
Reflective screen featuring. The reflective screen according to any one of claims 1 to 6,
An image source that projects a first polarized light that is a first image light and a second polarized light that is a second image light and a polarization direction different from the first polarized light onto the reflective screen;
A first image transmission unit that transmits the first polarized light reflected by the reflective screen and does not transmit the second polarized light reflected by the reflective screen; and the second polarized light reflected by the reflective screen. A second image transmission unit that transmits and does not transmit the first polarized light reflected by the reflection screen, wherein the first image transmission unit is in front of one eye of the observer, and the second image transmission unit is The first polarized light, which is attached to the observer so as to be disposed in front of the other eye of the observer and transmitted through the first image transmission unit, reaches one eye of the observer and transmits the second image. Polarized glasses that allow the second polarized light transmitted through the part to reach the other eye of the observer;
3D image display system. The stereoscopic video display system according to claim 7,
The video source includes a first video source that projects the first polarized light onto the reflective screen, and a second video source that projects the second polarized light onto the reflective screen;
3D video display system.

Images