JP7194347B2 - Decorative sheets, display devices, lighting devices, windows - Google Patents

Description

TECHNICAL FIELD The present invention relates to a decorative sheet, and a display device, lighting device, and window having the decorative sheet.

2. Description of the Related Art Transmissive screens used in rear projection display devices that project and display image light from the back side of the screen, such as that described in Patent Literature 1, for example, are known. Such transmissive screens normally appear black or white when no image is displayed. On the other hand, for surface members such as automobiles, furniture, and building materials for houses, designability is very important. 2. Description of the Related Art Currently, display devices that are applied to various fields are expected not only to have the function of simply displaying images, but also to be harmonious with the surrounding environment in terms of design.

JP-A-9-114003 JP-A-2005-37818 JP 2014-63064 A JP 2014-182335 A

Japanese Patent Laid-Open No. 2002-200000 proposes to provide a display on a screen to form a decorative sheet. However, the display object is provided with a portion having optical transparency. An image can be observed on the screen through this light transmissive portion. On the other hand, when the image is not displayed, the displayed object can be observed on the transmissive screen.

However, when the display object of Patent Document 2 is provided on a transmissive screen, the image light is blocked by the display object, and the utilization efficiency of the image light deteriorates. If the ratio of the light-transmitting portion is increased in order to improve the utilization efficiency of the image light, the ratio of the displayed object will decrease, and the expected design cannot be exhibited. For example, when providing a display on an in-vehicle screen as described in Patent Documents 3 and 4, it is desired that the display does not reduce the image light.

In addition, problems associated with screens in such display devices also occur in decorative sheets (screens, light control panels) applied to lighting devices and windows. Further, similar problems occur not only in display devices to which transmissive screens are applied, but also in display devices including an image forming device and a decorative sheet provided on the image forming surface of the image forming device. was

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above points, and an object of the present invention is to provide a decorative sheet that imparts designability while effectively suppressing a decrease in light utilization efficiency.

The decorative sheet of the present invention is
a light control layer including first portions arranged in a first direction and second portions having visible light transmittance alternately arranged in the first direction and the first portions;
A decorative layer laminated with the light control layer, the decorative layer having a plurality of pattern portions arranged at a position overlapping the first portion,
at least a portion of the plurality of pattern portions includes a chromatic portion;
an interface between the first portion and the second portion forms a reflective surface;
The width of the first portion changes so as to become thinner with increasing distance from the decorative layer.

At least a portion of the decorative sheet of the present invention may be curved.

In the decorative sheet of the present invention, the reflective surface may be a diffuse reflective surface.

The decorative sheet of the present invention may further include a light scattering layer.

In the decorative sheet of the present invention, the second portion may have light scattering properties.

In the decorative sheet of the present invention, the first portion may have light absorption properties.

In the decorative sheet of the present invention, the portion of the first portion on which the decorative layer is laminated may include a white portion.

In the decorative sheet of the present invention, the first portion may contain a light reflecting component.

The decorative sheet of the present invention may further include a Fresnel lens layer or a prism layer provided on the side of the light control layer opposite to the side on which the decorative layer is laminated.

The decorative sheet of the present invention further comprises a lenticular lens layer provided on the side of the light control layer opposite to the side on which the decorative layer is laminated,
The lenticular lens layer may have lenticular lens portions arranged in a direction crossing the first direction.

A first display device of the present invention comprises:
a transmissive screen made of any one of the decorative sheets described above;
and an image light source for projecting image light onto the transmissive screen.

A second display device of the present invention comprises:
any of the decorative sheets described above;
and an image forming device provided on the light control layer side of the decorative sheet.

The lighting device of the present invention is
any of the decorative sheets described above;
a light source that projects light onto the transmissive screen.

A window of the present invention includes any one of the decorative sheets described above.

ADVANTAGE OF THE INVENTION According to this invention, designability can be provided, suppressing the fall of the utilization efficiency of light effectively.

FIG. 1 is a diagram schematically showing a display device, and is a diagram showing an example of a positional relationship between an observer and a display device (image light source and transmissive screen (decorative sheet)). FIG. 2 is a perspective view schematically showing an image light source and a transmissive screen (decorative sheet). FIG. 3 is a cross-sectional view showing the layer structure of the transmissive screen, and is a diagram for explaining the light control layer included in the transmissive screen. FIG. 4 is a cross-sectional view showing the layer structure of the transmissive screen, and is a diagram for explaining a modified example of the first portion included in the light control layer. FIG. 5 is a diagram schematically showing a modified example of the display device. FIG. 6 is a diagram schematically showing another modification of the display device. FIG. 7 is a diagram showing a Fresnel lens layer included in a modification of the transmissive screen. FIG. 8 is a diagram showing a lenticular lens layer included in another modification of the transmissive screen. FIG. 9 is a diagram showing a modified example of the display device. FIG. 10 is a diagram showing another modification of the display device.

An embodiment of the present invention will be described below with reference to the drawings. In the drawings attached to this specification, for the convenience of illustration and ease of understanding, the scale and the ratio of vertical and horizontal dimensions are changed and exaggerated from those of the real thing.

In this specification, the terms "layer", "sheet" and "film" are not to be distinguished from each other based only on the difference in designation. For example, the term "layer" is a concept that includes members that can be called sheets or films.

In addition, terms such as "parallel", "perpendicular", "identical", length and angle values, etc. that specify shapes and geometric conditions and their degrees used in this specification are strictly It shall be interpreted to include the extent to which similar functions can be expected without being bound by the meaning.

FIG. 1 is a diagram schematically showing a display device 10 of one embodiment according to the present invention, exemplifying the positional relationship of the display device 10 with respect to an observer 1. FIG. As shown in FIG. 1, the display device 10 includes an image light source 15 and a decorative sheet. That is, in the example shown in FIG. 1, the display device 10 constitutes a rear projection type display device (projection display). Then, the decorative sheet functions as a transmissive screen 20. - 特許庁In other words, the transmissive screen 20 is made of a decorative sheet.

The display device 10 of this embodiment is configured as a so-called rear projection display device. The display device 10 includes a transmissive screen 20 (decorative sheet) that transmits image light L1 projected from the light input side to the light output side, and an image light source 15 arranged on the light input side of the transmissive screen 20. Prepare. The image light source 15 functions as a projector that projects image light L<b>1 onto the transmissive screen 20 . Here, the “light incident side” with respect to the transmissive screen 20 is the side on which the image light emitted from the image light source 15 is incident, and the “light exit side” with respect to the transmissive screen 20 is the side from which the image light is emitted.

The specific aspect of the image light L1 referred to here is not particularly limited, and the image light L1 can include light in general regardless of the specific type or content. Typically, the image light L1 can be composed of light that represents specific information, but light that has other arbitrary forms (for example, light that represents an irregular pattern, light that does not represent any specific information, etc.) Image light L1 may be configured. For example, the image light L1 may be light that transmits through a printed transparent film or the like to display an image, or may be light that displays a bright and dark image using a light blocking object. In the case where the image light L1 is light transmitted through a printed transparent film or the like or light for displaying brightness by a light blocking object, the image light source 15 includes the printed transparent film or light blocking object. may be The image light source 15 having such a transparent film or light shielding material and light source can also be called an image forming apparatus.

The image light source 15 of the present embodiment irradiates the image light L1 as a diverging light flux (enlarged and projected light flux) whose irradiation area gradually spreads over the entire light incident surface 21 of the transmissive screen 20 . Such image light source 15 is not particularly limited, and for example, a method using a cathode ray tube (CRT), a method using liquid crystal, a method using a digital micromirror device (DMD), or the like. known light source can be used as the image light source 15 .

The transmissive screen 20 has a light incident surface 21 located on the light incident side and a light exit surface 22 located on the light exit side. The light is emitted from 22 to the light exit side (observer 1 side). The transmissive screen 20 has a diffusion function and forms images in various directions. Therefore, the observer 1 can visually recognize the image formed by the image light L1 by observing the light exit surface 22 of the transmissive screen 20 from various directions.

FIG. 2 is a perspective view schematically showing the image light source 15 and the transmissive screen 20. As shown in FIG. The transmissive screen 20 of the present embodiment has a curved screen surface (light output surface 22) having a curved shape such that the light input surface 21 is generally convex and the light output surface 22 is generally concave. In the example of FIG. 2, the transmissive screen 20 is curved such that the light entrance surface 21 and the light exit surface 22 each form a three-dimensional curved surface. Here, "curving in a curved surface forming a three-dimensional curved surface" means curving partially or entirely about a plurality of axes inclined with respect to each other. In the illustrated example, the substantially rectangular transmissive screen 20 is generally parallel to the horizontal direction and parallel to the tangential plane of the transmissive screen 20 at the central position Pa of the transmissive screen 20. It curves in a first direction d1 centered on a first axis A1 located on the light exit side and is parallel to the vertical direction and centered on a second axis A2 located on the light exit side of the transmissive screen 20. It is curved in direction d2. As a result, the transmissive screen 20 as a whole curves to form a three-dimensional curved surface convex toward the image light source 15 side, and the light incident surface 21 protrudes most toward the image light source 15 side at the central position Pa of the transmissive screen 20. state. The transmissive screen 20 of the present embodiment has a multi-layer structure in which a plurality of layers are laminated as described later, and each layer is curved to form a similar three-dimensional curved surface.

Next, a specific configuration of the transmissive screen 20 will be described. FIG. 3 is a cross-sectional view showing the layer structure of the transmissive screen. As shown in FIG. 3, the transmissive screen 20 includes a light control layer 30, a decorative layer 40 laminated on the light control layer 30 from the viewer 1 side, and a decorative layer 40 of the light control layer 30. and a light scattering layer 50 laminated on the light control layer 30 from the image light source 15 side. Although each layer of the transmissive screen 20 is curved as described above, a part of the transmissive screen 20 is shown flat in FIG. 3 for easy understanding.

The light control layer 30 includes a light control section 31 and a base section 35 that supports the light control section 31 . The light control section 31 includes first portions 31a arranged in the first direction d1 and second portions 31b alternately arranged in the first direction d1 with the first portions 31a. The light control layer 30 changes the traveling direction of incident light to adjust the emission direction of the image light from the transmissive screen 20 . The thickness of the light control layer 30 is, for example, 120 μm or more and 170 μm or less. As shown in FIG. 3, an interface 31c between the first portion 31a and the second portion 31b of the light control layer 30 forms a reflective surface. Reflection on the reflecting surface can change the traveling direction of the light incident on the interface 31c. Moreover, preferably, the reflecting surface formed by the interface 31c is a diffuse reflecting surface. By diffusing and reflecting the light incident on the interface 31c, the intensity of the light emitted from the light emitting surface 22 can be made uniform regardless of the direction.

By forming the first portion 31a and the second portion 31b with materials having different refractive indices, the interface 31c between the first portion 31a and the second portion 31b can be a reflective surface. Further, by forming the interface 31c between the first portion 31a and the second portion 31b into a finely uneven surface, the interface between the first portion and the second portion can be made a diffuse reflection surface.

The first portion 31a and the second portion 31b are arranged, for example, in the first direction d1 and linearly extend in a second direction d2 intersecting the first direction d1.

Various cross-sectional shapes can be adopted for the first portion 31a and the second portion 31b depending on the required functions. In this embodiment, the width of the first portion changes so as to become narrower as the distance from the decorative layer increases. Here, the expression that the width of the first portion "changes so as to become narrower with distance from the decorative layer" means that the width of the first portion continuously changes according to the distance from the decorative layer. It does not mean only that, it means that it includes a portion whose width narrows as it separates from the decorative layer and does not include a portion whose width increases as it separates from the decorative layer. there is However, preferably, the width of the decorative layer continuously decreases in at least a partial region along the normal direction of the light control layer 30 .

In the example shown in FIG. 3, the cross-sectional shape of the first portion 31a is a trapezoidal shape whose one base is sufficiently smaller than the other base, and the cross-sectional shape of the second portion 31b is such that the other base is has a trapezoidal shape that is sufficiently smaller than one base. The longer base of the trapezoid faces the observer 1 side, that is, the side where the decorative layer 40 is laminated, and the shorter base faces the image light source 15 side, that is, the side where the light scattering layer 50 is laminated. ing.

A later-described pattern portion 41 of the decorative layer 40 is superimposed on the first portion 31a. The first portion 31a has a color that does not impair the design of the pattern portion 41 due to color mixing with the pattern portion 41 when observed by the observer 1. For example, the first portion 31a preferably has a white color that easily avoids color mixing.

The first portion 31a may have light absorption properties. The first portion 31a may be, for example, a portion containing light absorbing particles in a binder resin. Examples of light-absorbing particles include black pigments such as carbon black and titanium black. As another example, the first portion 31a may exhibit the diffuse reflection function not only at the interface 31c with the second portion 31b but also inside thereof. For example, the first portion 31a may contain a white pigment such as titanium oxide in a binder resin having a refractive index different from that of the second portion 31b. On the other hand, the second portion 31b has visible light transmittance.

The material of the first portion 31a and the second portion 31b is not particularly limited, but is preferably an ultraviolet curable binder resin. The refractive indices of the first portion 31a and the second portion 31b are set to has a refractive index of 1.47 or more and 1.50 or less, a refractive index of the second portion 31b is 1.55 or more and 1.61 or less, and a refractive index difference between the first portion 31a and the second portion 31b is 0.05 or more and 0 0.14 or less is preferred. More preferably, the refractive index of the first portion 31a is 1.49, and the refractive index of the second portion 31b is 1.56. By increasing the refractive index difference between the first portion 31a and the second portion 31b, more light can be reflected at the interface 31c between the first portion 31a and the second portion 31b. When the first portion 31a has light absorption properties, most of the light that enters the first portion 31a without being reflected at the interface 31c between the first portion 31a and the second portion 31b is absorbed by the first portion 31a. It can be made to be absorbed in 31a.

The base portion 35 is a member that can appropriately support the light control portion 31 . The base 35 has visible light transparency. Various materials can be used as the material of the base portion 35. However, in order to avoid the formation of a reflective interface between the base portion 35 and the second portion 31b of the light control portion 31, the base portion 35 is The refractive index and the refractive index of the second portion 31b are preferably the same. Typically, the base portion 35 is made of the same material as the second portion 31 b of the light control portion 31 .

The decorative layer 40 is a layer for decorating the transmissive screen 20 to give it a design. The decorative layer 40 displays information such as figures, patterns, designs, colors, pictures, photographs, characters, marks, characters, numbers, etc. be able to.

The decorative layer 40 has a plurality of pattern portions 41 arranged at positions overlapping the first portion 31a. That is, the decorative layer 40 is arranged in a pattern corresponding to the arrangement pattern of the first portions 31a. The pattern portion 41 is arranged so as to at least partially overlap any one of the first portions 31a. Here, the “position overlapping the first portion 31 a ” means a position facing the first portion 31 a in the normal direction of the light control layer 30 . Moreover, the position overlapping the first portion 31a includes both directly overlapping the first portion 31a and indirectly overlapping through another layer. Preferably, as in the illustrated example, the entire area of the pattern portion 41 is arranged at a position overlapping the first portion 31a. In the illustrated example, the plurality of pattern portions 41 are arranged in the first direction d1, similar to the first portion 31a. In the illustrated example, the pattern portion 41 has a width equal to or less than the maximum width W of the first portion 31a. Therefore, the light from the image light source 15 is less likely to enter the pattern portion 41 , thereby avoiding the mixture of the pattern portion 41 and the image light from being observed by the observer 1 . The thickness of such pattern portion 41 is, for example, 1 μm or more and 10 μm or less. In addition, in FIG. 3, the cross-sectional shape of the pattern portion 41 is rectangular, but the cross-sectional shape is not limited to this, and may be trapezoidal or the like.

At least part of the pattern portion 41 includes a chromatic portion. The pattern portion 41 is colored with, for example, a dye or a pigment, and displays a design with a design. The decorative layer 40 is laminated on the side of the light control layer 30 that is visually recognized by the observer 1 . Accordingly, the pattern portion 41 including the chromatic portion is observed by the observer 1 . That is, the pattern portion 41 of the decorative layer 40 can improve the design of the transmissive screen 20 .

In the illustrated example, the decorative layer 40 is composed of a plurality of pattern portions 41, but is not limited to this example. For example, the decorative layer 40 may have transparent portions arranged between the pattern portions 41 . The transmissive portion is made of, for example, transparent resin. The transmitting portion is arranged at a position overlapping the second portion 31b and transmits the image light. The second portion 31b of the light control section 31 can be protected by the transmission section. Further, the transparent portion may cover the second portion 31 b of the light control portion 31 and may also cover the pattern portion 41 . Such a transmission portion can function as a transparent protective film for protecting the light control layer 30 and the pattern portion 41 .

The light scattering layer 50 is arranged on the image light source 15 side of the light control layer 30 and scatters the image light from the image light source 15 . Although the structure of the light scattering layer 50 is not particularly limited, it typically includes a base portion made of a transparent resin and a light scattering component dispersed in the base portion. Incident light is scattered due to the refractive index difference between the base portion and the light scattering component, or due to the reflectivity of the light scattering component itself. The thickness of the light scattering layer 50 is, for example, 50 μm or more and 500 μm or less.

Such a light-scattering layer 50 can be produced, for example, by extruding a thermoplastic resin containing a large number of dispersed particulate light-scattering components into a plate shape. As the transparent resin forming the base portion, for example, methyl methacrylate butadiene styrene copolymer (MBS), acrylic resin, polycarbonate resin, or the like can be used. Examples of particulate light scattering components include inorganic fine particles such as barium sulfate fine particles, glass fine particles, aluminum hydroxide fine particles, calcium carbonate fine particles, silica (silicon dioxide) fine particles, and titanium oxide fine particles; - Organic fine particles such as styrene beads, polycarbonate beads, polyethylene beads, polystyrene beads, vinyl chloride beads, or silicone beads can be used, but organic fine particles are preferably used from the viewpoint of transparency. Alternatively, the light scattering component may be air bubbles. Although the diameter of the light scattering component is not particularly limited, light scattering components having a diameter of about 1 to 15 μm are usually used in the light scattering layer 50 .

Next, the operation of the transmissive screen 20 and the display device 10 of this embodiment will be described.

When the image light source 15 does not emit image light, the observer 1 observes a pattern displayed by the pattern portion 41 of the decorative layer 40 provided on the light emitting surface side of the transmissive screen 20 . Since the pattern portion 41 includes a portion colored in a chromatic color, it has a high degree of designability. The transmissive screen 20 is thus decorated. The pattern portion 41 is provided at a position overlapping the first portion 31a. When the first portion is white, the design of the pattern displayed by the pattern portion 41 is preferable in that the expected design can be exhibited without being affected by the first portion 31a. Alternatively, the effect of color mixing with the first portion 31a may be eliminated by preparing the pattern portion 41 in consideration of color mixing with the first portion 31a.

When the image light source 15 emits image light, the image light L3 enters the light scattering layer 50 laminated on the light incident surface 21 side of the transmissive screen 20, as shown in FIG. Light entering the light scattering layer 50 is scattered. The light scattered by the light scattering layer 50 then enters the light control layer 30 . Part of the light that has entered the light control layer 30 passes through the second portion 31b of the light control layer 30 and exits from the light exit surface 22 without entering the first portion 31a. Another part of the light incident on the light control layer 30 is directed toward the first portion 31a and reflected at the interface 31c between the first portion 31a and the second portion 31b. This light is emitted from the light exit surface 22 after its traveling direction is adjusted by reflection at the interface 31c. In the illustrated example, the image light is diffused in the light scattering layer 50 and the light control layer and passes through the transmissive screen. As a result, the image light is emitted in various directions, and the image displayed by the image light can be observed from various directions.

Since the image light is reflected at the interface 31c, it is restricted from entering the pattern portion 41 of the decorative layer 40 arranged at a position overlapping the first portion 31a. That is, when displaying an image, it is possible to effectively prevent the image light from being absorbed by the pattern portion 41 and utilize the image light with high utilization efficiency to display the image brightly. In particular, since the width W of the first portion 31a becomes narrower with increasing distance from the decorative layer 40, image light is transmitted through the transmissive screen 20 via the second portion 31b by reflection at the interface 31c. is effectively promoted, and a decrease in the utilization efficiency of image light by the pattern portion 41 can be effectively suppressed.

As described above, in the present embodiment, the transmissive screen 20 includes the first portions 31a arranged in the first direction d1 and the visible light transmitting screens arranged alternately in the first direction d1. and a decorative layer 40 laminated with the light control layer 30 and having a plurality of pattern portions 41 arranged at positions overlapping the first portion 31a. A decorative layer 40 is provided. At least part of the plurality of pattern portions 41 includes a chromatic portion. An interface 31c between the first portion 31a and the second portion 31b forms a reflective surface, and the width W of the first portion 31a changes so as to become thinner as the distance from the decorative layer 40 increases. According to such a transmissive screen 20, designability can be exhibited while effectively suppressing a decrease in utilization efficiency of image light.

In the embodiment described above, an example in which the decorative sheet is used as a transmissive screen has been described. That is, an example in which the decorative sheet forms a transmissive screen has been described. Also, a display device having a transmissive screen and an image light source for projecting image light onto the transmissive screen has been described. However, the display device is not limited to having a transmissive screen. That is, the application of the decorative sheet is not limited to screens used in projection display devices. For example, as a light source for emitting image light, an image forming apparatus capable of visually recognizing image light without forming an image on a screen may be used. That is, the display device 10 may have a decorative sheet 20 and an image forming device 16, as shown in FIG. Such an image forming device 16 is provided on the light control layer side of the decorative sheet 20 . In the example shown in FIG. 9, the decorative sheet 20 is arranged on the image forming surface 16a of the image forming apparatus 16. In the example shown in FIG. Examples of image forming apparatuses include a liquid crystal display (LCD), a cathode ray tube display (CRT), a plasma display (PDP), an electroluminescence display (ELD), a field emission display (FED), and the like.

Alternatively, as shown in FIG. 10, the image forming apparatus 17 may be a combination of a sheet material 17a having a transmission portion corresponding to a display image and a light source 17b. The sheet material 17a has a base material 17x having a light shielding property and a transmission region (transmission part) 17y provided on the base material 17x. The transmissive region 17y can be composed of, for example, a through hole formed in the base material 17x, or a film material provided in the through hole and transmitting light in a specific wavelength range. Further, in the example shown in FIG. 10, the color of the light emitted from the light source 17b may be changed so that the display object can be displayed in a plurality of colors.

The decorative sheet described above can be used in various applications, and is particularly suitable for applications that require a decorative layer with good design. Applications include lighting devices and windows in addition to display devices.

Specific examples of the display device include displays for automobile interiors, information boards embedded in walls, doors, partitions, etc. of buildings, displays for advertisements, billboards, etc., kitchens, bathrooms, bedrooms, and doorphones in houses. Display devices used for such as, furniture such as desks, chairs, shelves, partitions, closets, shoe cupboards, beds, etc., and embedded in home appliances such as vacuum cleaners, refrigerators, rice cookers, microwave ovens, washing machines, TVs, etc. A display indicator etc. can be mentioned. The content of the display on the display may be some kind of warning display such as an evacuation route, a fire alarm, or a warning light.

Specific examples of the lighting device include warning lamps, room lamps, foot lamps, illumination lamps for the interior of automobiles, side lamps for the exterior of automobiles, headlights, tail lamps, lamps such as winkers, and lighting fixtures. can.

Specific examples of windows include windows of houses and commercial facilities, show windows, and the like.

Various modifications can be made to the above-described embodiment. An example of modification will be described below with reference to the drawings. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding portions in the above-described embodiment are used for the portions that can be configured in the same manner as in the above-described embodiment. omit the description.

In the embodiment described above, the transmissive screen 20 was curved to form a three-dimensional curved surface. However, the transmissive screen 20 may be a so-called 2.5-dimensional curved surface that is partially or entirely curved around only one axis or around a plurality of mutually parallel axes. good. By forming the transmissive screen 20 into a 2.5-dimensional curved surface, a three-dimensional shape can be obtained without being stretched.

In the embodiments described above, the first portion 31a of the light control layer 30 consisted of a single element, as shown in FIG. However, as shown in FIG. 4, for example, the first portion 31a includes one side portion 31a1 on the side of the viewer 1, that is, the side on which the decorative layer 40 is laminated, and the other side portion 31a2 on the side of the image light source 15. and may be configured to have different elements. In such a modification, the one side portion 31a1 of the first portion 31a is preferably white. This is because, if the one side portion 31a1, which is the portion on the light output side where the pattern portion 41 of the first portion 31a overlaps, is white, the color will not be mixed with the pattern portion 41, and the design of the pattern portion 41 will not be affected. Also, the other side portion 31a2 of the first portion 31a is preferably black. If the other side portion 31 a 2 of the first portion 31 a on the light incident side, which is the image light source 15 side, is black, the image light incident on the first portion 31 a can be absorbed, and the image light is transmitted to the pattern portion 41 . can be prevented from emitting light from

Also, in the above-described embodiment, the first portion 31a of the light control layer 30 may include a light reflecting component. Since the first portion 31a contains the light reflection component, the light transmitted through the pattern portion 41 of the decorative layer 40 is reflected by the first portion 31a and transmitted through the pattern portion 41 again to emit light. The design can be observed more clearly. On the other hand, since part of the image light from the image light source 15 is reflected by the first portion 31a, it is possible to reduce the absorbed image light and increase the reflected image light while maintaining the light shielding property. Therefore, the utilization efficiency of image light can be improved.

Examples of light reflecting components contained in the first portion 31a include granular silver pigments and scaly metals. Alternatively, the light reflection component may be formed by forming a fine uneven shape on the interface 31c between the first portion 31a and the second portion 31b and depositing a metal film on the uneven shape.

Further, in the above-described embodiment, the light scattering layer 50 is arranged on the image light source 15 side of the light control layer 30. good. Furthermore, at the same time as the light scattering layer 50 or instead of the light scattering layer 50, the second portion 31b of the light control layer 30 may have light scattering properties. When the second portion 31b has light scattering properties, the second portion 31b includes, for example, a light scattering component dispersed therein.

1 and 2 show an example in which the image light L1 is directly emitted from the image light source 15 to the transmissive screen 20 (light incident surface 21), but the present invention is not limited to this. FIG. 5 is a diagram schematically showing a modified example of the display device 10. As shown in FIG. The display device 10 shown in FIG. 5 further includes a mirror section 18 in addition to the image light source 15 and the transmissive screen 20 described above. project to

The image light L1 emitted from the image light source 15 in this manner may be applied to the transmissive screen 20 via an optical element such as a mirror section 18, a prism section, or a lens. By interposing, for example, a mirror portion 18 or a prism portion between the image light source 15 and the transmissive screen 20, the optical path of the image light L1 can be adjusted. The transmissive screen 20 can be irradiated with the reduced image light L1. Further, these plural types of optical elements are arranged between the image light source 15 and the transmissive screen 20, and the image light L1 after the image is enlarged or reduced and the optical path is changed is converted to the transmissive screen 20 ( The light incident surface 21) may be irradiated.

Note that FIG. 5 shows an example in which the image light is reflected by one mirror portion 18 and projected onto the transmissive screen 20. can be projected onto

1 and 2 illustrate the transmissive screen 20 in which the light incident surface 21 is curved as a whole and the light exit surface 22 is curved as a whole, but the transmissive screen 20 has this shape. is not limited to FIG. 6 is a diagram schematically showing another modification of the display device 10. As shown in FIG. As shown in FIG. 6, the transmissive screen 20 may be curved such that the light entrance surface 21 is generally concave and the light exit surface 22 is generally convex. Alternatively, part of the transmissive screen 20 may be curved to be concave or convex. Although not shown, the transmissive screen 20 may be formed in a flat plate shape, and each of the light entrance surface 21 and the light exit surface 22 may be flat as a whole.

Further, the transmissive screen 20 may include members other than the light control layer 30, the decorative layer 40, and the light scattering layer 50 described above, and other functional layers expected to exhibit specific functions may be included. may be provided. In that case, a single functional layer may perform two or more functions, and at least one element of each layer described above may be provided with another function. The functions that can be imparted to the transmissive screen 20 are not particularly limited, but examples include a hard coating (HC) function that exhibits scratch resistance, an antifouling function, an anti-glare (AG: Anti-Glare) function, and reflection An anti-reflection (AR) function and the like are included.

Further, the transmissive screen 20 may further include a Fresnel lens layer 60 shown in FIG. 7 on the side of the light control layer 30 opposite to the side on which the decorative layer 40 is laminated. The Fresnel lens layer 60 has the function of deflecting the traveling direction of the image light from the image light source 15 and allowing the image light to enter the light incident surface 21 of the transmissive screen 20 in parallel. The Fresnel lens layer 60 has a base portion 61 and a Fresnel lens portion 62 formed on the surface of the base portion 61 . The base portion 61 is light transmissive, but may have light diffusing properties inside. As shown in FIG. 7, the Fresnel lens portion 62 has a Fresnel shape in which a plurality of lenses 62a are arranged concentrically.

The image light that enters the transmissive screen 20 at a large angle is not reflected by the interface 31c of the light control unit 31, but enters the first portion 31a and is absorbed. decreases. Furthermore, the brightness of the image observed by the observer decreases due to the portion of the image light that is absorbed, and the brightness varies within the plane. Therefore, by causing the image light to enter the light incident surface 21 of the transmissive screen 20 in parallel with the Fresnel lens layer 60, the utilization efficiency of the image light is improved, and the brightness of the image observed by the observer is improved. Variation can be reduced. Furthermore, even if the distance between the image light source 15 and the transmissive screen 20 becomes shorter as the image light enters with a greater inclination, the image light can be incident on the transmissive screen 20 in parallel. and the transmissive screen 20 can be brought closer to each other to make the display device 10 thinner.

Although illustration is omitted, instead of the Fresnel lens layer 60, a prism layer that deflects the incident image light may be provided. The prism layer can also reduce the incident angle to the transmissive screen 20 and allow the image light to enter the light incident surface 21 of the transmissive screen 20 in parallel. As a result, it is possible to improve the utilization efficiency of the image light and reduce the in-plane variation in the brightness of the image observed by the observer. In addition, since the prism shape for forming the prism layer is easy to design, it is possible to increase the degree of freedom in arranging the image light source 15 and the transmissive screen 20 .

Further, the transmissive screen 20 may further include a lenticular lens layer 70 shown in FIG. 8 on the side of the light control layer 30 opposite to the side on which the decorative layer 40 is laminated. The lenticular lens layer 70 has a base portion 71 and a lenticular lens portion 72 formed on the surface of the base portion 71 . The lenticular lens layer 70 has a function of diffusing image light incident from the base portion 71 side in the arrangement direction of the lenticular lens portions 72 and emitting the light. The lenticular lens portions 72 are arranged in a direction intersecting the first direction d<b>1 that is the arrangement direction of the first portions 31 a of the light control layer 30 . The arrangement direction of the lenticular lens portions 72 is preferably the second direction d2 orthogonal to the arrangement direction of the first portions 31a. The base portion 71 has optical transparency, but may have light diffusing properties inside. The lenticular lens portion 72 is formed by extending a plurality of convex lenses 72a in one direction. In the example shown in FIG. 8, the lenticular lens portion 72 extends in the first direction d1.

By diffusing the image light in a certain direction by the lenticular lens layer 70, the image light can be observed from a wider angle in that direction. On the other hand, the main diffusion direction of the image light by the lenticular lens layer 70 intersects the arrangement direction of the first portions 31a of the light control layer 30, and also coincides with the longitudinal direction of the first portions 31a of the light control layer 30. obtain. Therefore, the image light diffused by the lenticular lens layer 70 is less likely to be absorbed or reflected by the first portion 31a. As a result, it is possible to achieve both high utilization efficiency of the image light from the image light source 15 and a wide viewing angle.

Although some modifications to the above-described embodiment have been described above, it is of course possible to apply a plurality of modifications in combination as appropriate. For example, the items described as modifications to the transmissive screen can be used as modifications to the decorative sheet.

When the Fresnel lens layer 60 or the prism layer and the lenticular lens layer 70 of the modified example described above are provided at the same time, the lens surfaces of the two layers are brought into close contact with each other in a state where they face each other. It is advantageous in terms of In addition, since total reflection of incident light is less likely to occur, the display device 10 can be thinned by shortening the focal point of the Fresnel-shaped Fresnel lens layer 60 .

10 Display device 15 Image light source 16 Image forming device 16a Image forming surface 17 Image forming device 20 Transmissive screen, decorative sheet 21 Light incident surface 22 Light exit surface 30 Light control layer 31 Light control section 31a First portion 31a1 One side portion 31a2 Other side portion 31b Second portion 31c Interface 35 Base 40 Decorative layer 41 Design portion 50 Light scattering layer 60 Fresnel lens layer 61 Base 62 Fresnel lens 70 Lenticular lens layer 71 Base 72 Lenticular lens

Claims (12)

a light control unit including first portions arranged in a first direction; and second portions having visible light transmittance alternately arranged in the first direction and the first portions; and the light control unit. a light control layer comprising a supporting base ;
A decorative layer laminated with the light control layer, the decorative layer having a plurality of pattern portions arranged at a position overlapping the first portion,
at least a portion of the plurality of pattern portions includes a chromatic portion;
the refractive index of the base is the same as the refractive index of the second portion;
an interface between the first portion and the second portion forms a reflective surface;
The width of the first portion changes so as to become thinner as the distance from the decorative layer increases,
The first portion has a light-absorbing property,
The decorative sheet, wherein the second portion has light scattering properties. 2. The decorative sheet according to claim 1, wherein at least a portion of the decorative sheet is curved. 3. The decorative sheet according to claim 1, wherein said reflecting surface is a diffuse reflecting surface. 4. The decorative sheet according to any one of claims 1 to 3, further comprising a light scattering layer provided at a position facing said second portion. The decorative sheet according to any one of claims 1 to 4, wherein the portion of the first portion on which the decorative layer is laminated includes a white portion. The decorative sheet according to any one of claims 1 to 5 , wherein the first portion includes a light reflecting component. The decorative sheet according to any one of claims 1 to 6 , further comprising a Fresnel lens layer or a prism layer provided on the side of the light control layer opposite to the side on which the decorative layer is laminated. further comprising a lenticular lens layer provided on the side opposite to the side of the light control layer on which the decorative layer is laminated,
The decorative sheet according to any one of claims 1 to 7 , wherein the lenticular lens layer has lenticular lens portions arranged in a direction intersecting the first direction. a transmissive screen made of the decorative sheet according to any one of claims 1 to 8 ;
and a video light source that projects video light onto the transmissive screen. A decorative sheet according to any one of claims 1 to 8 ;
and an image forming device provided on the light control layer side of the decorative sheet. A decorative sheet according to any one of claims 1 to 8 ;
and a light source that projects light onto the decorative sheet. A window comprising the decorative sheet according to any one of claims 1 to 8 .

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