JP2015069049A - Semi-transmission type display body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a semi-transmission type display body capable of efficiently reflecting external light for making it display light, and capable of transmitting backlight light efficiently for making it display light, thereby even under an environment where the external light is abundant, or where the external light is not sufficient, excellent display characteristic can be obtained.SOLUTION: The semi-transmission type display body is formed by laminating a backlight, a mirror surface louver film, and a light diffusion film. The mirror surface louver film is formed of a transparent region and plural planar-shaped mirror surface regions fixed to the transparent region. The planar-shaped mirror surface regions are arranged in parallel in an optional one direction along the film surface of the mirror surface louver film.

Description

The present invention relates to a transflective display that exhibits a predetermined display function using external light in an environment rich in external light and using a backlight in an environment where external light is insufficient.
In particular, external light can be efficiently reflected to be display light, while backlight light can be efficiently transmitted to be display light, so that even in an environment with abundant external light. The present invention relates to a transflective display that can obtain excellent display characteristics even in an environment where external light is insufficient.

Conventionally, characters and images are printed on light-diffusing surfaces and specular reflective surfaces, or transparent or translucent films with characters or images printed on these surfaces are bonded. The reflection display body using external light is used as a signboard or a sign.
Such a reflective display uses external light such as direct sunlight, diffuse sky light, or secondary scattered light from buildings, road surfaces, trees, etc. as a light source to scatter and reflect desired display light. It is characterized by that.

  Moreover, as such a reflective display body, a reflective display body formed by laminating a light diffusion film in which fine particles are dispersed in resin on the front surface of a display layer on which a desired pattern or the like is printed (for example, Patent Document 1), a retroreflective reflective display body in which a display layer on which a desired pattern or the like is printed is laminated on the front surface of a retroreflective surface using a prism, a corner cube array, a microbead or the like ( For example, Patent Document 2) is known.

That is, in Patent Document 1, as shown in FIGS. 43A to 43B, at least one of the surfaces has irregularities, the total light transmittance is 90% or more, and the haze value is 20%. A front plate 301 for signboard made of the following translucent plate, the center line average roughness of the concavo-convex surface is 0.2 to 0.7 μm, and the 10-point average roughness is 1 to 7 μm. The plate is composed of a transparent substrate 302 and a light diffusion layer 303 laminated and integrated on one surface or both surfaces of the transparent substrate 302, and an uneven surface is formed on the surface of the light diffusion layer 303. A signboard front plate 301 and a signboard characterized in that a display body 320 is disposed on the back side of the signboard front plate 301 are disclosed.
Further, as the light diffusion layer described above, a structure in which resin particles (light diffusion material) are dispersed in a synthetic resin is disclosed.

Further, in Patent Document 2, as shown in FIG. 43 (c), there are a plurality of retroreflective cube corner sheet materials 424 defined by an observation surface and at least two intersecting sets of parallel groove groups. A cube layer 432 having a structured surface 435 with a cube corner element and a metal film 430 disposed on at least some of the cube corner elements, bonded to the front surface and the viewing surface of the cube layer 432; A substantially transparent overlay layer 434 having a rear surface and a colored indicator 416 disposed on the overlay layer 434, wherein the colored indicator 416 is aligned with at least one set of the grooves. A retroreflective cube corner sheet material 424 is disclosed.
Further, it is disclosed that the above-described colored sign is diffusely reflective.

JP 2001-109414 A (Claims) Japanese translation of PCT publication No. 2003-531396 (Claims)

  However, the signboard using the signboard front plate described in Patent Document 1 and the retroreflective cube corner sheet material described in Patent Document 2 use an internal light source (hereinafter sometimes referred to as “backlight”). Since only external light is used as the light source, display light cannot be emitted in an environment where there is no external light, and there is a problem in that display content is not visually recognized by an observer.

  In this regard, even in the signboard using the signboard front plate described in Patent Document 1 and the retroreflective cube corner sheet material described in Patent Document 2, a dedicated external auxiliary light source is provided, or the front light is used. By providing an external light source other than natural light, it is possible to solve the above-described problem.

However, when a dedicated external auxiliary light source is provided, it becomes difficult to secure the installation space, and the installation causes a problem that the design of the reflective display body as a whole deteriorates.
Further, when the front light is provided, the display light is transmitted through the front light and emitted to the viewer side, which causes a problem that the display quality is likely to deteriorate.

In view of the above circumstances, the present inventors have made intensive efforts and found that the above-described problems can be solved by using a predetermined mirror surface louver film in a transflective display, and the present invention has been developed. It has been completed.
That is, the object of the present invention is to allow external light to be efficiently reflected and used as display light, while backlight light can be efficiently transmitted and used as display light. It is an object of the present invention to provide a transflective display that can obtain excellent display characteristics even in an environment or in an environment with insufficient external light.

According to the present invention, it is a transflective display formed by laminating a backlight, a specular louver film, and a light diffusion film, and the specular louver film is fixed to the transparent region and the transparent region. A plurality of plate-like mirror surface regions, and the plate-like mirror surface region is parallel to any one direction along the film surface of the mirror surface louver film (meaning a surface other than the end surface of the film; the same applies hereinafter). A transflective display body characterized by being arranged is provided, and the above-described problems can be solved.
That is, in the case of the transflective display of the present invention, since a predetermined specular louver film is used, external light can be efficiently reflected and used as display light, while backlight light is efficient. It can be transmitted well and used as display light.
In addition, since the transflective display of the present invention uses a light diffusion film, the light emitted to the viewer side is effectively diffused by the reflection or transmission function of the specular louver film, and the display light is displayed. Can widen the viewing angle.
Therefore, with the transflective display of the present invention, excellent display characteristics can be obtained even in an environment rich in external light or in an environment where external light is insufficient.
In the present invention, the “semi-transmissive display” refers to a display light that reflects external light in an environment with abundant external light, and transmits a backlight in an environment with insufficient external light. This means a display body of the type used as display light.

Further, in constituting the transflective display body of the present invention, the angle θ1 formed by the plate-like mirror surface area between the normal line of the plate-like mirror surface area and the normal line of the film surface of the mirror-like louver film is 1 to 40 °. It is preferable that they are arranged in parallel so as to have a value within the range.
With this configuration, the external light reflected by the specular louver film can be efficiently emitted as display light to the observer, while backlight light transmitted through the specular louver film is also transmitted to the observer. On the other hand, it can be efficiently emitted as display light.

Further, in configuring the transflective display of the present invention, it is preferable that the width of the plate-like mirror surface region is set to a value within the range of 1 to 10,000 μm and the thickness is set to a value within the range of 10 to 10,000 nm. .
With this configuration, the external light reflected by the specular louver film can be emitted as display light more efficiently to the observer, while the backlight light transmitted through the specular louver film is also observed by the observer. In contrast, the display light can be emitted more efficiently.

In configuring the transflective display of the present invention, it is preferable that the transparent region is made of a transparent resin and the plate-like mirror surface region is made of a metal vapor deposition film.
By comprising in this way, the mirror surface louver film of predetermined thickness can be obtained efficiently.

Moreover, in constructing the transflective display of the present invention, the thickness of the mirror louver film is preferably set to a value within the range of 1 to 10,000 μm.
Such a configuration makes it easy to handle and manufacture, obtains good mechanical strength and durability, and as a result, obtains good display characteristics over a long period of time.

Further, in constituting the transflective display body of the present invention, a display layer is provided between the specular louver film and the light diffusion film or on the side opposite to the side where the specular louver film is located in the light diffusion film. It is preferable.
By configuring in this way, the desired display content by the display layer can be obtained even in an environment where the external light is abundant or an environment where the external light is insufficient due to the effect of the predetermined specular louver film. It is possible to display with excellent display characteristics.

In constructing the transflective display of the present invention, the light diffusion film has an internal structure including a plurality of regions having a relatively high refractive index in a region having a relatively low refractive index in the film. A light diffusion film is preferred.
With this configuration, external light incident from a wide range of angles can be efficiently diffused and emitted as display light to the observer through reflection by the specular louver film, and the specular louver film The backlight light that has passed through can also be diffused and emitted as display light to the observer efficiently.

Further, in constituting the transflective display of the present invention, the internal structure of the light diffusing film includes a plurality of columnar objects having a relatively high refractive index in a region having a relatively low refractive index. It is preferable that the column structure be formed in a column.
With this configuration, external light incident from a wide range of angles can be diffused and emitted as display light to the observer more efficiently through reflection by the specular louver film, and the specular louver. The backlight light transmitted through the film can also be diffused and emitted as display light more efficiently for the observer.

In constructing the transflective display of the present invention, the light diffusion film thickness is a value in the range of 60 to 700 μm, and the incident angle of the incident light with respect to the normal of the film surface is defined as the film longitudinal direction. When changing in the range of −70 to 70 ° along the direction, the haze value for each incident angle is preferably 70% or more.
With this configuration, external light incident from a wide range of angles can be diffused and emitted as display light more efficiently to the observer through reflection by the specular louver film.
In addition, the "film longitudinal direction" mentioned above means the moving direction of the said coating layer at the time of photocuring the coating layer formed by apply | coating the composition for light diffusion films in a film form.

In configuring the transflective display of the present invention, the backlight is preferably an edge light type backlight.
By comprising in this way, the transmission efficiency of the backlight light with respect to a mirror surface louver film can further be improved.

FIGS. 1A to 1C are diagrams for explaining the configuration of the transflective display of the present invention. FIGS. 2A and 2B are diagrams for explaining the characteristics of the transflective display of the present invention. FIGS. 3A to 3C are diagrams provided for explaining the specular louver film. 4 (a) to 4 (c) are diagrams provided for explaining a method of manufacturing a specular louver film. FIG. 5 is another diagram provided for explaining the specular louver film. FIG. 6 is a diagram for explaining an edge light type backlight. FIGS. 7A to 7B are views provided to explain the outline of the light diffusion film having a column structure in the film. FIGS. 8A to 8B are diagrams for explaining the incident angle dependency and the isotropic light diffusion in the light diffusion film having a column structure in the film. FIGS. 9A to 9C are diagrams provided for explaining a method of measuring the light diffusion characteristics of the light diffusion film. FIGS. 10A to 10C illustrate the light diffusion film of Example 1 as an example, the light diffusion characteristics of the light diffusion film, and the display light when the light diffusion film is applied to a reflective display. It is a figure provided in order to demonstrate the relationship with diffused emission. FIGS. 11A to 11C illustrate the light diffusion characteristics of the light diffusion film and the display light in the case where the light diffusion film is applied to a reflective display body, taking the light diffusion film of Example 1 as an example. It is another figure provided in order to demonstrate the relationship with diffused emission. 12A to 12C illustrate the relationship between the light diffusion characteristics of a light diffusion film that does not satisfy a predetermined parameter and the diffusion emission of display light when the light diffusion film is applied to a reflective display. FIG. FIGS. 13A to 13C illustrate the relationship between the light diffusing characteristics of a light diffusing film that does not satisfy a predetermined parameter and the diffused emission of display light when the light diffusing film is applied to a reflective display. It is another figure provided in order to do. FIGS. 14A to 14B are views provided to explain a predetermined light diffusion film having a column structure in the film. FIGS. 15A and 15B are views for explaining the column structure. FIG. 16 is a diagram provided for explaining the relationship between the inclination direction of the columnar object and the normal direction of the plate-like mirror surface region. 17 (a) to 17 (b) are diagrams provided to explain each step in the method for producing a light diffusion film having a column structure in the film. FIGS. 18A to 18D are diagrams provided to explain the active energy ray irradiation process. FIG. 19 is another diagram provided for explaining the active energy ray irradiation process. 20 (a) to 20 (d) are diagrams provided for explaining other light diffusion films used in the present invention. FIGS. 21A and 21B are other views for explaining the configuration of the transflective display of the present invention. FIGS. 22A to 22C are diagrams and photographs provided to show a cross section of the light diffusion film in Example 1. FIG. FIGS. 23A to 23B are diagrams provided for explaining a method of measuring the light diffusion characteristics of the light diffusion film. FIG. 24 is a diagram provided for illustrating an incident angle-haze value chart of the light diffusion film in Example 1. FIG. 25 is a diagram for explaining a method of measuring light diffusion characteristics corresponding to a case where a light diffusion film is applied to a reflective display body. FIGS. 26A to 26H are conoscopic images provided to show light diffusion characteristics corresponding to the case where the light diffusion film in Example 1 is applied to a reflective display body. FIG. 27 is an incident angle-luminance chart provided to show light diffusion characteristics corresponding to the case where the light diffusion film in Example 1 is applied to a reflective display. FIGS. 28A to 28B are diagrams provided to illustrate the optical characteristics of the specular louver film in Example 1. FIG. FIG. 29 is a diagram for explaining a method for evaluating a transflective display. FIGS. 30A to 30B are photographs showing display characteristics of the transflective display body of Example 1 and the reflective display body of Comparative Example 1. FIG. 31A to 31D are photographs showing display characteristics of the transflective displays of Example 1 and Examples 4 to 5. FIG. FIG. 32 is another photograph showing display characteristics of the transflective display body of Example 1 and the reflective display body of Comparative Example 1. 33 (a) to 33 (c) are diagrams and photographs provided for showing a cross section of the light diffusion film in Example 2. FIG. 34 (a) to 34 (b) are other photographs provided for showing a cross section of the light diffusion film in Example 2. FIG. FIG. 35 is a diagram provided for illustrating an incident angle-haze value chart of the light diffusion film in Example 2. 36 (a) to 36 (g) are conoscopic images provided to show light diffusion characteristics corresponding to the case where the light diffusion film in Example 2 is applied to a reflective display body. FIG. 37 is an incident angle-luminance chart provided to show light diffusion characteristics corresponding to the case where the light diffusion film in Example 2 is applied to a reflective display body. FIGS. 38A to 38C are a diagram and a photograph provided to show a cross section of the light diffusion film in Example 3. FIG. 39 (a) to 39 (b) are other photographs provided to show a cross section of the light diffusion film in Example 3. FIG. 40 is a diagram provided for illustrating an incident angle-haze value chart of a light diffusion film in Example 3. FIG. 41A to 41G are conoscopic images provided to show light diffusion characteristics corresponding to the case where the light diffusion film in Example 3 is applied to a reflective display. FIG. 42 is an incident angle-luminance chart provided to show light diffusion characteristics corresponding to the case where the light diffusion film in Example 3 is applied to a reflective display body. FIGS. 43A to 43C are views for explaining a conventional reflective display.

An embodiment of the present invention is a transflective display formed by laminating a backlight, a specular louver film, and a light diffusion film, and the specular louver film has a transparent area and the transparent area. A transflective display body comprising a plurality of fixed plate-like mirror surface regions, and the plate-like mirror surface region being arranged in parallel in any one direction along the film surface of the mirror surface louver film. is there.
Embodiments of the present invention will be specifically described below with reference to the drawings as appropriate.

1. Basic Configuration of Transflective Display Body As shown in FIG. 1A, the transflective display body 1 of the present invention is formed by laminating a backlight 150, a specular louver film 10, and a light diffusion film 100. This is a transflective display body 1.
The mirror surface louver film 10 includes a transparent region 10b and a plurality of plate-like mirror surface regions 10a fixed to the transparent region 10b. It is arranged in parallel in any one direction along the surface.
Therefore, in the case of the transflective display 1 of the present invention, since the predetermined specular louver film 10 is used, as shown in FIG. 2A, the external light 3a is efficiently reflected to display the display light 4a. On the other hand, as shown in FIG. 2 (b), the backlight light 3b can be efficiently transmitted into the display light 4b.
Therefore, the transflective display 1 of the present invention can obtain excellent display characteristics even in an environment where the external light 3a is abundant or in an environment where the external light 3a is insufficient. it can.

Moreover, as shown in FIG.1 (b), it is preferable that the transflective display body 1 of this invention has the display layer 20 between the specular louver film 10 and the light-diffusion film 100, and FIG. As shown in c), it is also preferable to have the display layer 20 on the opposite side of the light diffusion film 100 from the side where the specular louver film 10 is located.
By providing the display layer in this way, the desired display content of the display layer can be displayed with excellent display characteristics even in an environment with abundant external light or an environment with insufficient external light. Can be displayed.
The display layer means a resin film or the like on which characters or designs are printed, a display panel such as a liquid crystal display panel, or the like.

2. Mirror surface louver film As shown in FIGS. 3A to 3C, the transflective display body of the present invention includes a transparent region 10b and a plurality of plate-like mirror region 10a fixed to the transparent region 10b. And a mirror surface louver film 10 in which a plurality of plate-like mirror surface regions 10 a are arranged in parallel in any one direction along the film surface of the mirror surface louver film 10.
The reason for this is that by providing a predetermined mirror surface louver film, external light can be efficiently reflected and used as display light, while backlight light can be efficiently transmitted and used as display light. It is.
3A shows a perspective view of the specular louver film 10, FIG. 3B shows a top view (plan view) of the specular louver film 10, and FIG. ) Shows a cross section of the mirror louver film 10 when the mirror louver film 10 shown in FIG. 3B is cut in the vertical direction along the dotted line AA and the cut surface is viewed from the direction along the arrow. The figure is shown.

That is, if it is the predetermined specular louver film 10 as shown to Fig.3 (a)-(c), as shown to Fig.2 (a), it will arrange | position in parallel in a louver shape in the environment where external light 3a is abundant. The external light 3a incident from the direction opposite to the surfaces of the plurality of plate-like mirror surface regions 10a can be efficiently reflected without being transmitted to form display light 4a and emitted to the observer 5. it can.
On the other hand, as shown in FIG. 2B, in an environment where the external light 3a is insufficient, the direction within a predetermined angle range from parallel to the surfaces of the plurality of plate-like mirror surface regions 10a arranged in parallel in a louver shape. The backlight light 3b incident from the light can be efficiently transmitted to form display light 4b and emitted to the observer 5.
Therefore, in the case of the predetermined mirror surface louver film 10, ideally, the external light 3a and the backlight light 3b are used in an environment where the incident angle of the external light 3a and the incident angle of the backlight light 3b are orthogonal to each other. The display light (4a, 4b) can be obtained with a utilization efficiency of almost 100%.
Note that the outside light 3a can be regarded as abundant in the outside light 3a from all directions in an environment where the outside light 3a is abundant. Since the external light 3a from the side is blocked, the external light 3a inevitably enters mainly from the direction facing the observer 5.
In addition, since the incident angle of the backlight 3b can be adjusted as will be described later, for example, as described later, the backlight 150 is an edge light backlight 150 or a collimator method. By using the backlight 150, the light can be incident on the surfaces of the plurality of plate-like mirror surface regions 10a arranged in parallel in a louver shape from a direction within a predetermined angle range from parallel.
In addition, in FIG.3 (b), when it sees from upper direction, the aspect by which the mirror surface was spread | laid without gap is shown, However, The mirror surface louver film in this invention is not limited to such an aspect.
That is, as shown in FIG. 2 (a), the plate-like mirror surface region 10a is inclined with respect to the film surface, so that even if there is a region that is not a mirror surface when viewed from above, it is obliquely This is because incident external light can be reflected sufficiently efficiently.

(1) Transparent area Moreover, as shown to Fig.3 (a)-(c), the transparent area | region 10b in the mirror surface louver film 10 has transparency for transmitting external light, its reflected light, and backlight light. While having, it is an area | region which functions as a support body for arranging the several plate-shaped mirror surface area | region 10a in parallel in arbitrary one directions along the film surface of the mirror surface louver film 10. FIG.
Accordingly, the material substance constituting the transparent region is not particularly limited as long as it has transparency and can support a plurality of plate-like mirror surface regions. Transparent resin, glass, and transparent metal oxide Etc. can be used.

In addition, the transparent region is made of a transparent resin having an average total light transmittance in the visible light region of 50% or more, more preferably 80% or more, and further preferably 90% or more among the material substances described above. Is more preferable.
This is because such a transparent resin sufficiently transmits visible light and provides good display characteristics. Moreover, since processing is easy if it is a transparent resin, the uneven shape for forming a plurality of plate-like mirror surface regions so as to be arranged in parallel in any one direction along the film surface of the mirror surface louver film is easy This is because it can be formed.
Further, since the transparent resin can be molded to an arbitrary thickness, the thickness of the mirror louver film can be easily adjusted, and a mirror louver film having a predetermined thickness can be obtained efficiently.
Here, as the transparent resin constituting the transparent region, a conventionally known transparent resin can be used. For example, thermoplastic resins such as polyethylene resin, polypropylene resin, polyethylene terephthalate resin, vinyl chloride resin, polystyrene resin, ABS resin, (meth) acrylic resin, polyamide resin, polycarbonate resin, tetrafluoroethylene resin and ethylene vinyl acetate copolymer, Examples thereof include thermosetting resins such as phenol resins, melamine resins, unsaturated polyester resins and epoxy resins, various acrylate resins such as urethane acrylate having an acryloyl group in the molecule, and ultraviolet curable resins such as unsaturated polyesters.
In addition, as long as the transparent resin mentioned above does not impair the objective of this invention, two or more different types can be used together. For example, two or more kinds of resins having different refractive indexes can be used in combination.
Moreover, various additives, such as a pigment, can also be contained in the transparent resin mentioned above.

Here, using FIGS. 4A to 4C, an example of a method for producing a specular louver film when a transparent resin is used as a material substance in the transparent region will be described.
That is, first, as shown in FIG. 4A, a transparent resin film 10b ′ having a predetermined concavo-convex shape 16 formed by repeating the inclined surface 12 and the inclined surface 14 is formed on one surface.
As shown in FIG. 4B, the predetermined uneven shape 16 has a plate-like mirror surface region 10 a formed only on the inclined surface 12, and the plate-like mirror surface region 10 a is formed on the inclined surface 14. Instead, the state is maintained as it is.
Accordingly, the plurality of inclined surfaces 12 on which the plate-like mirror surface region 10a is formed are arranged in parallel in any one direction along the film surface of the mirror-like louver film 10, similarly to the plurality of plate-like mirror surface regions 10a to be formed later. To be formed.
Further, the plurality of inclined surfaces 14 in which the plate-like mirror surface region 10a is not formed are formed so as to be arranged in parallel in any one direction along the film surface of the mirror surface louver film 10, similarly to the plurality of inclined surfaces 12. become.
In addition, this predetermined uneven | corrugated shape 16 transfers the surface shape by a casting_mold | template, and subsequent hardening by a heat | fever or active energy ray (for example, ultraviolet rays) with respect to the smooth resin layer before uneven | corrugated shape formation of transparent resin film 10b ' Generally, it is formed by processing, extrusion molding, or embossing, but it can also be formed by laser processing.

Next, as shown in FIG. 4B, the plate-like mirror surface region 10 a is formed only on the inclined surface 12 in the predetermined uneven shape 16.
As a method for forming such a plate-like mirror surface region 10a, for example, by imparting directivity to the flight direction of metal molecules from a vapor deposition source by vacuum deposition, the plate-like mirror surface region 10a is selectively formed only on the inclined surface 12. Can be formed.

Next, as shown in FIG. 4 (c), a transparent resin composition is applied on the predetermined uneven shape 16 on which a plurality of plate-like mirror surface regions 10a are formed, and then cured to be transparent resin layer 10b ″. By doing so, the final specular louver film 10 is obtained.
In addition, although it is preferable that the kind of transparent resin which comprises transparent resin film 10b 'and transparent resin layer 10b''is the same from a viewpoint of aligning a refractive index, you may differ.
Further, the transparent resin layer 10b ″ is not essential and may be omitted. In that case, the predetermined concavo-convex shape 16 in which the plurality of plate-like mirror surface regions 10a are formed is in contact with the light diffusion film, the display layer, or the backlight directly or through the adhesive layer.

(2) Plate-like mirror surface area Moreover, as shown to Fig.3 (a)-(c), the plate-like mirror surface area | region 10a in the mirror surface louver film 10 is supported by the transparent area | region 10b mentioned above, and the mirror surface louver film 10 of FIG. This is a plate-like region having a highly reflective mirror surface arranged in parallel in any one direction along the film surface.
Therefore, the material substance constituting the plate-like mirror surface region is not particularly limited as long as it can be formed as a plate-like region having a mirror surface with high reflectivity, and aluminum, chromium, zinc, gold, silver, A metal such as copper, iron, platinum, nickel, or an alloy thereof, or a dielectric multilayer film can be used.

Moreover, it is preferable that a plate-shaped mirror surface area | region consists of a metal vapor deposition film.
The reason for this is that, as described in the section of the transparent region, for example, by providing directivity in the flight direction of the metal molecules from the vapor deposition source by vacuum vapor deposition, as shown in FIG. This is because it is possible to selectively form the plate-like mirror surface region 10a only.
Moreover, it is because a uniform and highly reflective mirror surface can be stably formed.

In addition, as shown in FIG. 5, the plate-like mirror surface region 10 a has an angle θ <b> 1 (hereinafter referred to as the inclination of the plate-like mirror surface region) formed by the normal line of the plate-like mirror surface region 10 a and the normal line of the film surface of the mirror-like louver film 10. The inclination angle θ1 may mean an acute angle (narrower angle)), and may be arranged in parallel so as to have a value within a range of 1 to 40 °. preferable.
The reason for this is that by setting the inclination angle θ1 of the plate-like mirror surface region to a value within this range, the external light 3a ′ reflected by the mirror surface louver film 10 is given to the observer 5 as shown in FIG. On the other hand, the display light 4a can be efficiently emitted as the display light 4a. On the other hand, as shown in FIG. 2B, the backlight light 3b transmitted through the specular louver film 10 is also efficiently displayed to the observer 5. It is because it can radiate | emit as.
That is, when the inclination angle θ1 of the plate mirror region is less than 1 °, the interval L1 between the plurality of plate mirror regions 10a arranged in parallel in FIG. This is because it may be difficult to efficiently pass through the specular louver film. On the other hand, when the inclination angle θ1 of the plate-like mirror surface area exceeds 40 °, even if the external light reflected by the mirror surface louver film is efficiently diffused by the light diffusion film, the display light is displayed within the observer's field of view. This is because it may be difficult to emit the light.
Therefore, the inclination angle θ1 of the plate-like mirror surface region is more preferably set to a value within the range of 5 to 35 °, and further preferably set to a value within the range of 10 to 30 °.

Moreover, as shown in FIG. 5, it is preferable to make the width L2 of the plate-like mirror surface region 10a a value within the range of 1 to 10000 μm.
This is because if the width L2 of the plate-like mirror surface region is less than 1 μm, the mirror surface louver film becomes a diffusing element such as a diffraction grating, and the function of reflecting external light may not be obtained. On the other hand, when the width L2 of the plate-like specular region exceeds 10,000 μm, the period of the plate-like specular region in the specular louver film can be visually recognized by the observer, depending on the distance at which the transflective display is observed. This is because there are cases.
Accordingly, the width L2 of the plate-like mirror surface region is more preferably set to a value within the range of 10 to 1000 μm, and further preferably set to a value within the range of 20 to 500 μm.

Moreover, as shown in FIG. 5, it is preferable to make thickness L3 of the plate-shaped mirror surface area | region 10a into the value within the range of 10-10000 nm.
The reason for this is that when the thickness L3 of the plate-like mirror surface region is less than 10 nm, it becomes difficult to form the plate-like mirror region uniformly, and part of the incident light is transmitted and the reflectance tends to decrease. This is because there are cases. On the other hand, when the thickness L3 of the plate-like mirror surface region exceeds 10,000 nm, the area of the end surface of the plate-like mirror surface region becomes excessively large, making it difficult for the backlight light to efficiently pass through the mirror-like louver film. This is because there may be cases.
Therefore, the thickness L3 of the plate-like mirror surface region is more preferably set to a value within the range of 100 to 1000 nm, and further preferably set to a value within the range of 200 to 500 nm.

(3) Thickness Moreover, as shown in FIG. 5, it is preferable to make thickness L4 of the mirror surface louver film 10 into the value within the range of 1-10000 micrometers.
The reason for this is that by setting the thickness L4 of the specular louver film to a value within such a range, manufacturing becomes easy and sufficient display characteristics can be realized.
That is, when the thickness L4 of the mirror surface louver film is less than 1 μm, it may be difficult to form a plate-like mirror surface region due to being too thin. On the other hand, when the thickness L4 of the specular louver film exceeds 10,000 μm, the display image may be easily blurred due to being too thick.
Therefore, the thickness L4 of the mirror louver film is more preferably set to a value within the range of 10 to 1000 μm, and further preferably set to a value within the range of 20 to 500 μm.
As shown in FIG. 5, the thickness L5 of the transparent region 10b below the plate-like mirror surface region 10a is usually preferably a value in the range of 0.5 to 5000 μm, and preferably in the range of 5 to 500 μm. It is more preferable to set the value within the range, and it is particularly preferable to set the value within the range of 10 to 250 μm. On the other hand, the thickness L6 of the transparent region 10b above the plate-like mirror surface region 10a is usually preferably a value in the range of 0.5 to 5000 μm, and a value in the range of 5 to 500 μm. More preferably, a value within the range of 10 to 250 μm is particularly preferable.
The transflective display of the present invention requires a combination of a mirror louver film and a light diffusion film, but omits the light diffusion film and, for example, for light diffusion with respect to the plate-like mirror surface region. It is also possible to provide the unevenness or to disperse fine particles for light diffusion in the transparent region.

3. Backlight The backlight used in the transflective display body of the present invention is not particularly limited, and a conventionally known backlight can be used, which may be an edge light type or a direct type, Moreover, conventionally well-known light sources, such as a cold cathode tube and LED, can be used also about a light source.

Further, the backlight is preferably an edge light type backlight.
This is because the backlight efficiency of the backlight light with respect to the specular louver film can be further improved with an edge light type backlight.
That is, as shown in FIG. 6, in the case of the edge light type backlight 150, the light 160 emitted from the light source 152 such as an LED enters the inside of the acrylic plate 154 from the side, and the acrylic light is repeatedly reflected on the surface. It spreads inside the plate 154.
Then, the light 160 that hits the reflective dots 155 is diffused and exits from the surface of the acrylic plate 154 to become backlight light 3b having directivity (directivity in the upper right direction in FIG. 6).
Therefore, in the case of the edge light type backlight 150, as shown in FIG. 2 (b), the orientation of the plurality of plate-like mirror surface regions 10a arranged in parallel in a louver shape is considered only by considering the installation direction. Thus, the backlight 3b can be incident from a direction within a predetermined angle range from the parallel.
Needless to say, it is also preferable to use a collimated backlight in which the directivity of the backlight light is adjusted to be constant using a collimating plate or the like.

4). Light diffusing film Light diffusing film diffuses external light incident from a wide range of angles as display light efficiently to the viewer through reflection by a specular louver film in an environment rich in external light. It has a function to emit light.
Further, in an environment where the external light is insufficient, the backlight light transmitted through the specular louver film has a function of efficiently diffusing and emitting as a display light to the observer.
In addition, the light diffusion film in the present invention is not particularly limited. For example, a light dispersion of a fine particle dispersion system in which silicone fine particles having a number average particle diameter of 0.5 to 20 μm are dispersed in an acrylic transparent resin. A conventionally known light diffusion film such as a film can be used.

Especially, it is preferable to use the light-diffusion film which has an internal structure provided with the several area | region with a relatively high refractive index in the area | region where a refractive index is relatively low in a film especially.
The reason for this is that if the light diffusing film has such a predetermined internal structure, external light incident from a wide range of angles can be more efficiently displayed as display light to the observer through reflection by the specular louver film. This is because the diffused light can be emitted and the backlight light transmitted through the specular louver film can also be diffused and emitted as display light to the observer more efficiently.
Hereinafter, the light diffusion film having such a predetermined internal structure will be specifically described. First, the basic principle of the light diffusion film having the predetermined internal structure will be described with reference to FIGS.
That is, the basic principle of a light diffusing film having a predetermined internal structure will be described by taking as an example a light diffusing film having a column structure in a film which is a basic mode of a light diffusing film having a predetermined internal structure.

(1) Basic Principle of Light Diffusion in Light Diffusing Film First, FIG. 7A shows a top view (plan view) of a light diffusing film 100a having a column structure in the film, and FIG. The light diffusion film 100a having a column structure in the film shown in FIG. 7 (a) is cut in the vertical direction along the dotted line AA, and the cut surface is viewed in the direction of the arrow. A cross-sectional view of 100a is shown.
8A shows an overall view of the light diffusion film 100a having a column structure in the film, and FIG. 8B shows a light diffusion having the column structure in the film of FIG. 8A. Sectional drawing at the time of seeing the film 100a from the X direction is shown.
As shown in the plan view of FIG. 7A, the light diffusion film 100a having a column structure in the film includes a columnar body 112 having a relatively high refractive index and a region 114 having a relatively low refractive index. The column structure 113 is as follows.
In addition, as shown in the cross-sectional view of FIG. 7B, in the in-plane direction of the light diffusion film 100a having a column structure in the film, the columnar body 112 having a relatively high refractive index and the refractive index are relatively The low regions 114 are alternately arranged with a predetermined width.

Thus, as shown in FIG. 8A, when the incident angle is within the light diffusion incident angle region, it is estimated that the incident light is diffused by the light diffusion film 100a having a column structure in the film. .
That is, as shown in FIG. 7B, the incident angle of the incident light with respect to the light diffusion film 100a having a column structure in the film is a value within a predetermined angle range from parallel to the boundary surface 113a of the column structure 113. That is, when the value is within the light diffusion incident angle region, the incident light (152, 154) changes the thickness of the columnar body 112 having a relatively high refractive index in the column structure while changing its direction. It is presumed that the light traveling on the light exit surface side is not uniform by passing along the direction.
As a result, when the incident angle is within the light diffusion incident angle region, it is estimated that the incident light is diffused by the light diffusion film 100a having a column structure in the film and becomes diffused light (152 ′, 154 ′). .
On the other hand, when the incident angle of the incident light with respect to the light diffusion film 100a having the column structure in the film deviates from the light diffusion incident angle region, as shown in FIG. In the cross section cut in the vertical direction along A, it is presumed that the light diffuses through the light diffusion film 100a as it is without being diffused by the light diffusion film 100a and becomes transmitted light 156 ′.
In the present invention, the “light diffusion incident angle region” refers to the angle of incident light corresponding to emitting diffused light when the angle of incident light from a point light source is changed with respect to the light diffusing film. Means range.
Further, the “light diffusion incident angle region” is an angle region determined for each light diffusion film depending on a difference in refractive index or an inclination angle of the column structure in the light diffusion film, as shown in FIG. is there.

Based on the basic principle described above, the light diffusion film 100a having the column structure 113 in the film can exhibit the incident angle dependency in the transmission and diffusion of light, as shown in FIG. 8A, for example. Become.
Further, as shown in FIGS. 7 and 8, the light diffusion film 100a having the column structure 113 usually has “isotropic”.
Here, in the present invention, “isotropic” means that when incident light is diffused by the film, as shown in FIG. 8 (a), a plane parallel to the film in the diffused outgoing light (the end face of the film) This means that the light diffusion state (the shape of the spread of the diffused light) within the surface does not change depending on the direction within the same surface. To do.
More specifically, as shown in FIG. 8A, when incident light is diffused by the film 100a, the diffused state of the diffused outgoing light is circular in a plane parallel to the film.

In addition, as shown in FIG. 8B, in the light diffusion film having a column structure in the film, when the “incident angle θa” of the incident light is referred to, the incident angle θa is the surface of the incident side of the light diffusion film. It means the angle (°) when the normal angle is 0 °.
In the present invention, the “light diffusion angle region” means an angle range of diffused light obtained by fixing a point light source at an angle at which incident light is most diffused with respect to the light diffusion film. Shall.
Further, in the present invention, the “diffuse light opening angle θb” is the angular width (°) of the “light diffusion angle region” described above, and the cross section of the film was viewed as shown in FIG. In this case, the spread angle θb of diffused light is meant.
It has been confirmed that the angle width (°) of the light diffusion angle region and the width of the light diffusion incident angle region are substantially the same.

Further, as in the case of the incident light B shown in FIG. 8A, the light diffusion film 100a having a column structure in the film has an incident angle when the incident angle of the incident light is included in the light diffusion incident angle region. Even if they are different, substantially the same light diffusion can be performed on the light exit surface side.
Therefore, it can be said that the light diffusion film having a column structure in the film has a light collecting function for concentrating light at a predetermined position.
In addition, the direction change of the incident light inside the columnar body 112 in the column structure is not only a step index type in which the direction changes linearly and zigzag by total reflection as shown in FIG. In some cases, the gradient index type changes direction.
7A and 7B, the boundary surface between the columnar object 112 having a relatively high refractive index and the region 114 having a relatively low refractive index is represented by a straight line for simplicity. Actually, the interface is slightly meandering, and each columnar object forms a complex refractive index distribution structure with branching and disappearance.
As a result, it is presumed that the non-uniform distribution of optical characteristics increases the light diffusibility.
Hereinafter, the light diffusion film having a column structure in the above-described film will be described by taking more specific aspects as examples.

(2) Light Diffusion Film Having Column Structure in Film As a light diffusion film having a column structure in the film, a light diffusion film having the following configuration will be described as an example.
That is, the internal structure is a column structure, the film thickness of the light diffusing film is a value within the range of 60 to 700 μm, and the incident angle of incident light with respect to the normal of the film surface is along the film longitudinal direction. A light diffusion film having a haze value of 70% or more with respect to each incident angle when changed in the range of −70 to 70 ° will be described as an example.

(2) -1 Single layer It is preferable that the light-diffusion film which concerns on this aspect is a single layer.
This is because the bonding process can be reduced as compared with the case where a plurality of light diffusion films are laminated, which is not only economically advantageous, but also the occurrence of blurring and delamination in the display image. It is because it can suppress effectively.
In addition to the case where a plurality of light diffusing films are directly laminated, the case where a plurality of light diffusing films are laminated via other films, etc. are included in the case where a plurality of light diffusing films are laminated. To do.

(2) -2 Light Diffusion Properties In addition, as shown in FIGS. 9A to 9C, the light diffusion film according to this embodiment has an incident angle θa with respect to the normal line of the film surface, and a composition for light diffusion film. When the coating layer 101 formed by coating the coating layer 101 with a film is photocured, the incident direction is changed in the moving direction B of the coating layer 101, that is, in the range of −70 to 70 ° along the film longitudinal direction. The haze value for the angle θa is 70% or more.
This is because the light diffusing film has such a predetermined light diffusing characteristic, so that external light incident from a wide range of angles can be more efficiently displayed to the observer through reflection by the specular louver film. This is because it can be diffused and emitted.
That is, when the haze value is less than 70%, it may be difficult to efficiently diffuse and emit external light reflected by the specular louver film as display light to the observer.
Therefore, the incident angle θa with respect to the normal of the film surface, along the moving direction (film longitudinal direction) of the coating layer when photocuring the coating layer formed by coating the composition for light diffusion film in a film shape, When changed in the range of −70 to 70 ° (one end side in the film longitudinal direction is positive and the other end side is negative), the haze value for each incident angle θa is 75% or more. More preferably, the value is 80% or more.
In addition, when the above-mentioned light diffusion characteristics are usually satisfied on one side of the film, it has been confirmed that the other side is also satisfied. However, it is needless to say that a predetermined effect is obtained, and it is within the range of the light diffusion film according to this embodiment.

In FIG. 9A, the irradiation light 50 from the point light source 202 is converted into parallel light 60 by the lens 204, and the coating layer 101 on the process sheet 102 moving along the movement direction B is irradiated. It is a side view which shows a mode that it is photocuring.
FIG. 9B shows that the incident angle θa with respect to the normal of the film surface is −70 to 70 ° along the moving direction B (film longitudinal direction) of the coating layer using the light source 310 and the integrating sphere 320. It is a side view which shows a mode that the haze value with respect to each incident angle (theta) a is measured, changing in the range.
Moreover, FIG.9 (c) is the side view which showed a mode that the incident angle (theta) a with respect to the normal line of the film surface was changed in the range of -70-70 degrees in the state which fixed the film.

Next, the relationship between the light diffusion characteristics of the light diffusion film according to this aspect and the diffusion emission of display light when the light diffusion film is applied to a reflective display will be described with reference to FIGS.
Here, when the light diffusing film is applied to the reflective display body, the display light is diffused and emitted when the transflective display body of the present invention is used in an environment rich in outside light (without using backlight light). This corresponds to diffused emission of display light in the case of using external light as a light source.
This is because the reflection plate (specular reflection plate) in the reflective display corresponds to the plate-like mirror region of the mirror louver structure in the present invention.
Therefore, evaluating the diffused emission of display light when the light diffusing film is applied to a reflective display body is to evaluate the display characteristics of the transflective display body of the present invention in an environment rich in outside light. Equivalent to.

First, the outline of FIGS. 10 to 13 will be described. In FIG. 10A, light is incident on the light diffusion film 100a (light diffusion film according to this embodiment) of Example 1 at an incident angle θa. The state of once diffusing is shown.
FIG. 10B shows an incident angle-haze value chart obtained by measuring the haze value (%) with respect to each incident angle θa (°) when the incident angle θa in FIG. 10A is changed. It is.
Further, FIG. 10C shows a state of diffusion of light once diffused in the range of each incident angle θa when the incident angle θa in FIG. 10A is changed (schematic diagram of conoscopic image). Is shown.

Further, in FIG. 11 (a), the light diffusion film 100a of Example 1 is bonded to the reflecting plate 10 ′ to form a test piece for measurement, and light is incident at an incident angle θa from the film side of the test piece. It is shown that it is incident and diffused twice through reflection on the reflecting plate 10 '.
Further, FIG. 11B shows an incident angle obtained by measuring the luminance (cd / m ² ) of the film front with respect to each incident angle θa (°) when the incident angle θa in FIG. 11A is changed. A luminance chart is shown.
Further, FIG. 11C shows the diffusion state (conoscopic image) of light diffused twice for each incident angle θa when the incident angle θa of FIG. 11A is changed.

FIG. 12 (a) shows a light diffusion film 100α having a column structure in the film that does not satisfy the parameters of the light diffusion film according to this embodiment (hereinafter, “light diffusion film that is not a light diffusion film according to this embodiment” ).), Light is incident at an incident angle θa and diffused once.
FIG. 12B shows an incident angle-haze value chart obtained by measuring the haze value (%) with respect to each incident angle θa (°) when the incident angle θa in FIG. 12A is changed. It is.
Further, FIG. 12 (c) shows how light diffuses once for each range of incident angles θa when the incident angle θa in FIG. 12 (a) is changed (schematic diagram of conoscopic image). Is shown.

In FIG. 13 (a), a light diffusing film 100α that is not a light diffusing film according to this embodiment is bonded to the reflecting plate 10 ′ to form a test piece for measurement, and the incident angle θa from the film side of the test piece. The state in which the light is incident and diffused twice through reflection on the reflecting plate 10 'is shown.
FIG. 13B shows an incident angle obtained by measuring the luminance (cd / m ² ) of the film front with respect to each incident angle θa (°) when the incident angle θa in FIG. 13A is changed. A luminance chart is shown.
Further, FIG. 13C shows a diffusion state (conoscopic image) of light diffused twice with respect to each incident angle θa when the incident angle θa in FIG. 13A is changed.

First, as shown in the incident angle-haze value chart of FIG. 10B, the light diffusion film 100a of Example 1 shown in FIG. 10A changes the incident angle θa in the range of −70 to 70 °. In this case, the haze value for each incident angle θa is 70% or more, which satisfies the requirements for the light diffusion film according to this embodiment.
In addition, in the incident angle-haze value chart of FIG. 10B, the incident angles θa = −70 to −18 °, −18 to −2 °, −2 to 34 °, 34 to 44 °, and 44 to 70 °. The diffusion state of the light once diffused with respect to is as shown in the schematic diagram of the conoscopic image in FIG.
That is, in the light diffusion film 100a of Example 1, when the incident angle θa is changed in the range of −70 to 70 °, the haze value with respect to each incident angle θa is a value of 70% or more. As shown in c), it can be seen that uniform diffused light with less linearly transmitted light can be obtained over the entire range of the incident angle θa = −70 to 70 ° (the haze value decreases as the amount of linearly transmitted light increases). ).
More specifically, in the range of the incident angle θa = −2 to 34 °, the incident angle θa corresponds to the light diffusion incident angle region described with reference to FIG. It can be seen that circular isotropic light diffusion occurs as shown in FIG.
On the other hand, in the range of incident angle θa = −70 to −18 °, −18 to −2 °, 34 to 44 °, and 44 to 70 °, the incident angle θa is the light described with reference to FIG. Since it falls outside the range of the diffuse incident angle region, it is understood that circular isotropic light diffusion does not occur and crescent-shaped light diffusion occurs as shown in FIG.

Here, in the above description using FIG. 7B, when the incident angle θa is outside the range of the light diffusion incident angle region, in the cross section cut in the vertical direction along the dotted line AA, It was described that incident light was transmitted without being diffused by the film.
However, this description is for the sake of convenience in explaining the light diffusion incident angle region where isotropic light diffusion occurs. Actually, as in the case of incident light A and C in FIG. When the angle is not included in the light diffusion incident angle region, the diffusion of the emitted light in a plane parallel to the film becomes a crescent shape.
Here, it should be noted that actually, the crescent-shaped diffused light is literally diffused light, not transmitted light.
In any case, the light diffusion film 100a of Example 1 has a haze value of 70% or more for each incident angle θa when the incident angle θa is changed in the range of −70 to 70 °. Although there is a difference between isotropic light diffusion and crescent-shaped light diffusion, it can be seen that uniform diffused light with little linearly transmitted light can be obtained in the entire range of the incident angle θa = −70 to 70 °.

As a result, the light diffusion film 100a of Example 1 shown in FIG. 10A diffuses light having an incident angle θa twice in total through reflection on the reflecting plate 10 ′, as shown in FIG. 11A. In this case, it is possible to efficiently diffuse and emit to the front of the film.
That is, as shown in the incident angle-luminance chart of FIG. 11B, when the incident angle θa is changed in the range of 0 to 60 °, the luminance of the film front with respect to each incident angle θa is at least incident angle θa = In a range of 10 to 40 °, the value exceeds 8 cd / m ² (a gain of about 1: a value determined to reflect external light more efficiently than a standard white plate). It can be seen that the light can be efficiently diffused and emitted to the front of the film by a total of two diffusions through the reflection of the reflector 10 '.
This is because the incident light can be uniformly diffused in the first diffusion if it is the light diffusion film of Example 1, so that the second diffusion through the reflection on the reflector is the reflection angle and the internal structure. Even if it becomes non-uniform due to the inclination angle, it is considered that uniform diffused light can be emitted to the film surface side as a result.
Moreover, the model which diffuses a total of 2 times shown to Fig.11 (a) is a model for measuring the light-diffusion characteristic at the time of applying a light-diffusion film to a reflection type display body.

In FIG. 11C, in order to show the actual state more specifically, the diffusion state of the light diffused twice with respect to the incident angles θa = 0 °, 20 °, 40 ° and 60 ° (conoscopic image) ) Is shown.
That is, the luminance distribution from 0 cd / m ² to the maximum luminance value in each conoscopic image is expressed in 14 levels from blue to red, with 0 cd / cm ² being blue and exceeding 0 cd / m ² . Value to the maximum luminance value in each conoscopic image is divided into 13 equal parts, and from 0 cd / m ² to the maximum luminance value, blue to light blue to green to yellow to orange to red and 13 are obtained. Shown to change in stages.
Also, the radially drawn lines in each conoscopic image are each in the direction of azimuth angle 0 ° -180 ° (meaning that they are on a straight line connecting azimuth angle 0 ° and azimuth angle 180 °, and so on). 45 ° -225 ° direction, 90 ° -270 ° direction, 135 ° -315 ° direction, and concentric lines are drawn from the inside in the polar angle direction 18 °, 38 °, 58 °, 78 ° Indicates.
Therefore, the color at the central portion of each concentric circle in each conoscopic image represents the relative luminance of diffused light diffused and emitted to the front of the film, and the absolute luminance at the central portion of each concentric circle is shown in FIG. It corresponds to the value of the vertical axis of each plot of b).

On the other hand, the light diffusion film 100α that is not the light diffusion film according to the present embodiment shown in FIG. 12A has an incident angle θa of −70 to 70 ° as shown in the incident angle-haze value chart of FIG. When changing in the range, the haze value may take a value of less than 70% depending on the value of the incident angle θa, which does not satisfy the requirements of the light diffusion film according to this embodiment.
Further, the incident angle θa = −70 to −17 °, −17 to −7 °, −7 to 16 °, 16 to 36 °, and 36 to 70 ° in the incident angle-haze chart of FIG. The diffusion condition of the light once diffused is as shown in the schematic diagram of the conoscopic image in FIG.
That is, the light diffusion film 100α that is not the light diffusion film according to the present embodiment has a haze value of less than 70% depending on the value of the incident angle θa when the incident angle θa is changed in the range of −70 to 70 °. As shown in FIG. 12C, it can be seen that, in such a range of the incident angle θa, the linearly transmitted light increases and uniform diffused light cannot be obtained.
More specifically, in the range of the incident angle θa = −7 to 16 °, the incident angle θa corresponds to the light diffusion incident angle region described with reference to FIG. 8A and the like, and the haze value is 70. Since the value is at least%, it can be seen that circular isotropic light diffusion occurs as shown in FIG.
On the other hand, in the range of incident angles θa = −17 to −7 ° and 16 to 36 °, the incident angle θa falls outside the range of the light diffusion incident angle region described with reference to FIG. Since the haze value is 70% or more, it can be seen that a circular isotropic light diffusion does not occur and a crescent-shaped light diffusion occurs as shown in FIG.
On the other hand, in the range of incident angles θa = −70 to −17 ° and 36 to 70 °, the incident angle θa falls outside the range of the light diffusion incident angle region described with reference to FIG. From the fact that the haze value is less than 70%, it can be seen that although the crescent-shaped light diffusion occurs as the contour, the non-uniform light diffusion in which the straight transmitted light appears strongly in the central portion is generated. .
Therefore, the light diffusion film 100α that is not the light diffusion film according to the present embodiment has a haze value of less than 70% depending on the value of the incident angle θa when the incident angle θa is changed in the range of −70 to 70 °. Therefore, it can be seen that in such a range of the incident angle θa, although the crescent-shaped light diffusion occurs as an outline, the straight transmitted light increases and uniform diffused light cannot be obtained.

As a result, the light diffusing film 100α that is not the light diffusing film according to the present embodiment shown in FIG. 12 (a) causes the light having the incident angle θa to be reflected by the reflecting plate 10 ′ as shown in FIG. 13 (a). When it is diffused a total of two times, it becomes difficult to efficiently diffuse and emit the light to the front of the film.
That is, as shown in the incident angle-luminance chart of FIG. 13B, when the incident angle θa is changed in the range of 0 to 60 °, the luminance of the film surface with respect to each incident angle θa is the incident angle θa = 10. A value exceeding 8 cd / m ² can be obtained only in a range of ˜30 °, and a wide range of incident light is efficiently diffused to the front of the film by two diffusions through the reflection of the reflector 10 ′. It turns out that it cannot emit.
In addition, since the drop in the brightness of the film surface when the incident angle θa is changed from 20 ° to 30 ° is significant, the incident angle θa is effectively only in front of the film within a narrow range of 0 to 20 °. It can also be seen that diffuse emission is not possible.
This is because the light diffusing film that is not the light diffusing film according to this aspect cannot diffuse the incident light uniformly in the first diffusion, particularly when the absolute value of the incident angle θa is large. This is because when the second diffusion through reflection on the film becomes non-uniform due to the relationship between the reflection angle and the inclination angle of the internal structure, uniform diffused light cannot be emitted to the film surface side. Conceivable.
In other words, when the diffused light emitted to the film surface side becomes non-uniform, normally, the diffused light is emitted at a relatively high luminance at an angle other than the film front. It is thought that it becomes easy to fall.
In FIG. 13C, in order to more specifically show the actual state, the diffusion state of the light diffused twice with respect to the incident angles θa = 0 °, 20 °, 40 ° and 60 ° (conoscopic image) ) Is shown.
Therefore, as in the case of FIG. 11C, the color in the central portion of each concentric circle in each conoscopic image represents the relative luminance of diffused light diffused and emitted to the front of the film, and the center of each concentric circle The absolute luminance in the portion corresponds to the value on the vertical axis of each plot in FIG.

In addition, like the light-diffusion film in Example 1 mentioned above, the light-diffusion film which concerns on this aspect is a case where the incident angle in the azimuth angle direction of external light changes, and the incident angle in a polar angle direction changes Even in this case, the light can be efficiently diffused and emitted to the front of the film by two diffusions through the reflection of the reflector.
On the other hand, in the case of a light diffusion film that is not the light diffusion film according to this embodiment described above, the incident angle of external light in the polar angle direction changed in the azimuth angle direction orthogonal to the moving direction of the coating layer (film longitudinal direction). In this case, it is possible to efficiently diffuse and emit to the front surface of the film by two diffusions through the reflection of the reflecting plate.
However, in the case of a light diffusing film that is not a light diffusing film according to this aspect, for external light from other azimuthal directions, if the incident angle of the external light in the polar angle direction changes, the reflection of the reflecting plate Even with two diffusions through the film, it becomes difficult to efficiently diffuse and emit the light to the front of the film.
Therefore, even in a transflective display using a light diffusing film that is not a light diffusing film according to the present embodiment, in an environment where the incident angle of external light changes only in a specific azimuth angle direction (for example, embedded in the ground, In the case of using sunlight as external light, etc.), it can be sufficiently used as a transflective display.

(2) -3 Internal structure The light diffusing film according to this aspect includes a plurality of columnar objects having a relatively high refractive index in a region where the internal structure of the light diffusing film is relatively low in the film thickness. The column structure is not particularly limited as long as the column structure is formed in the direction.
However, from the viewpoint of stably exhibiting the predetermined light diffusion characteristics described above, when one surface of the light diffusion film is the first surface and the other surface is the second surface, the columnar object is, It is preferable that the deformed columnar object has a shape that changes from the first surface toward the second surface.
This is because, for example, in the case of a light diffusing film having a column structure made of a normal columnar material that does not change in shape from the first surface toward the second surface, the above-mentioned predetermined light diffusion characteristics can be stably obtained. This is because it has been confirmed that this is not possible.
On the other hand, in the case of a light diffusing film having a column structure made of a deformed columnar material whose shape changes from the first surface toward the second surface, the above-mentioned predetermined light diffusion characteristics can be stably obtained. This is because it has been confirmed.
Hereinafter, a column structure made of a deformed columnar material will be specifically described.

More specifically, as shown in FIG. 8A, in the deformed columnar body 112, it is preferable that the diameter increases from the second surface 116 toward the first surface 115.
This is because a predetermined light diffusion characteristic can be more stably imparted to the light diffusion film by forming a column structure having such a deformed columnar body.
That is, with such a deformed columnar body, it is more stable with respect to the light diffusion film because light that is parallel to the axial direction of the columnar body is less likely to pass straight through compared to a normal columnar body. This is because a predetermined light diffusion characteristic can be imparted to.

Moreover, as shown to Fig.14 (a), it is preferable that deformation | transformation columnar thing 112 'has a bending part in the middle of the said columnar thing.
This is because by forming a column structure having such a deformed columnar body, it is possible to impart predetermined light diffusion characteristics to the light diffusion film more stably.
That is, with such a deformed columnar object, it is not only difficult for light to pass straight through, but also the spread angle of the diffused light can be increased compared to a normal columnar object. This is because predetermined light diffusion characteristics can be imparted.

Further, as shown in FIG. 14B, the deformed columnar bodies (112a ″, 112b ″) are arranged in the first columnar body 112a ″ positioned on the first surface 115 ″ side and the second columnar body 112 ″. And the second columnar body 112b ″ located on the side of the surface 116 ″.
The reason for this is that by forming a column structure having such deformed columnar bodies, the light diffusion film can be provided with a predetermined light diffusion characteristic more stably, as well as the light diffusion characteristic obtained. This is because it can be controlled efficiently.
That is, with such a deformed columnar object, it is not only difficult for light to pass straight through, but also the spread angle of the diffused light can be increased compared to a normal columnar object. This is because predetermined light diffusion characteristics can be imparted.
Moreover, it has the overlapping column structure area | region formed by the upper end part of a 1st columnar thing and the lower end part of a 2nd columnar thing overlapping alternately like the light-diffusion film of Example 3 mentioned later. It is also preferable.
The reason for this is that by having such an overlapping column structure region, the generation of scattered light in the portion where the columnar object is not formed between the first and second columnar objects is suppressed, and the intensity of the diffused light within the light diffusion angle region This is because the uniformity can be further improved.

(I) Refractive index In the column structure, it is preferable that the difference between the refractive index of the columnar body having a relatively high refractive index and the refractive index of the region having a relatively low refractive index be 0.01 or more.
The reason for this is that when the difference in refractive index is less than 0.01, the angle range at which incident light is totally reflected in the column structure becomes narrow, and the incident angle dependency may be excessively reduced. It is.
Therefore, it is more preferable to set the difference between the refractive index of the columnar body having a relatively high refractive index in the column structure and the refractive index of the region having a relatively low refractive index to a value of 0.05 or more. More preferably, the above values are used.
In addition, it is preferable that the difference between the refractive index of the columnar object having a relatively high refractive index and the refractive index of the region having a relatively low refractive index is large, but from the viewpoint of selecting a material capable of forming a bent column structure, About 0.3 is considered to be the upper limit.

(Ii) Maximum Diameter In addition, as shown in FIG. 15A, in the column structure, it is preferable that the maximum diameter S in the cross section of the columnar object is a value within the range of 0.1 to 15 μm.
This is because when the maximum diameter is less than 0.1 μm, it may be difficult to exhibit light diffusion characteristics regardless of the incident angle of incident light. On the other hand, when the maximum diameter exceeds 15 μm, the light traveling straight in the column structure increases, and the uniformity of the diffused light may deteriorate.
Therefore, in the column structure, the maximum diameter in the cross section of the columnar article is more preferably set to a value within the range of 0.5 to 10 μm, and further preferably set to a value within the range of 1 to 5 μm.
In addition, although it does not specifically limit about the cross-sectional shape of a columnar thing, For example, it is preferable to set it as a circle, an ellipse, a polygon, an irregular shape, etc.
Moreover, the cross section of a columnar thing means the cross section cut | disconnected by the surface parallel to the film surface.
In addition, the maximum diameter, length, etc. of a columnar object can be measured by observing with an optical digital microscope.

(Iii) Distance between columnar objects In addition, as shown in FIG. 15A, in the column structure, the distance between the columnar objects, that is, the space P in the adjacent columnar objects is a value within the range of 0.1 to 15 μm. It is preferable that
This is because, when the distance is less than 0.1 μm, it may be difficult to exhibit light diffusibility regardless of the incident angle of incident light. On the other hand, when the distance exceeds 15 μm, the light traveling straight in the column structure increases, and the uniformity of the diffused light may deteriorate.
Therefore, in the column structure, the distance between the columnar objects is more preferably set to a value within the range of 0.5 to 10 μm, and further preferably set to a value within the range of 1 to 5 μm.

(Iv) Thickness Further, the thickness of the column structure, that is, as shown in FIG. 15B, the length La of the columnar object in the normal direction of the film surface is set to a value within the range of 50 to 700 μm. Is preferred.
The reason for this is that when the thickness La of the column structure is less than 50 μm, the length of the columnar object is insufficient, and the incident light that goes straight through the column structure increases, and diffusion in the light diffusion angle region This is because it may be difficult to obtain uniformity of light intensity. On the other hand, when the thickness La of the column structure exceeds 700 μm, when the column structure is formed by irradiating the composition for light diffusion film with active energy rays, This is because the traveling direction of photopolymerization diffuses and it may be difficult to form a desired column structure.
Accordingly, the thickness La of the column structure is more preferably set to a value within the range of 70 to 400 μm, and further preferably set to a value within the range of 80 to 300 μm.
In addition, as shown in FIG. 15B, the light diffusing film according to this aspect may have a column structure (film thickness direction length La) formed in the entire film thickness direction, or the upper end and lower end of the film. At least one of the portions may have a column structure unformed portion.
In the case of a column structure having a deformed columnar body as shown in FIGS. 14A to 14B, in the upper portion (portion on the side irradiated with active energy rays when manufacturing the light diffusion film). The ratio between the length of the columnar object and the length of the columnar object in the lower portion is usually preferably within the range of 7: 1 to 1:50.

(V) Inclination angle Moreover, as shown in FIG.15 (b), in the column structure, it is preferable that the columnar thing 112 stands by the fixed inclination | tilt angle (theta) c with respect to the film thickness direction of a light-diffusion film.
The reason for this is that by making the inclination angle of the columnar object constant, incident light can be more stably reflected in the column structure, and the incident angle dependency derived from the column structure can be further improved. .
Moreover, it is preferable to make inclination-angle (theta) c into the value within the range of 0-50 degree.
This is because the light diffusion angle region expressed by the column structure is adjusted in an arbitrary direction. That is, in consideration of the position where the transflective display body is installed and the angle at which the viewer views the transflective display body, the diffused light is collected in the direction of the viewer.
More specifically, for example, in a scene where the viewer views the image approximately in front of the transflective display body, the tilt angle θc of the columnar object is controlled so that the front of the film is a light diffusion angle region. To do. On the other hand, for example, in a scene where the viewer visually recognizes the transflective display body from below, the inclination angle θc of the columnar object is controlled so that the direction becomes the light diffusion angle region.
However, when the inclination angle θc exceeds 50 °, it may be difficult to emit diffused light to the front surface of the film.
Therefore, the inclination angle θc is more preferably set to a value within the range of 0 to 40 °, and further preferably set to a value within the range of 0 to 30 °.
In addition, the inclination angle θc is a method for the film surface measured in a cross section when the film is cut by a plane perpendicular to the film plane and cut into two along the axis of one whole columnar object. This means the inclination angle (°) of the columnar object when the line angle is 0 °.
More specifically, as shown in FIG. 15B, the inclination angle θc means an angle on the narrower side of the angle formed between the normal line of the upper end surface of the column structure and the uppermost part of the columnar object.
Further, as shown in FIG. 15B, the inclination angle when the columnar object is inclined to the left is used as a reference, and the inclination angle when the columnar object is inclined to the right is expressed as minus.
In the case of a column structure having a deformed columnar body as shown in FIGS. 14 (a) to 14 (b), the inclination angle of the columnar body (columnar object on the light incident side) in the upper part is usually 0 to 50 °. In addition, the inclination angle of the columnar object (columnar object on the light emission side) in the lower part is preferably set to a value in the range of 0 to 50 °.

Further, with respect to the inclination angle of the columnar object, the external light incident on the transflective display is efficiently diffused by the light diffusion film and then reflected by the specular louver film, as shown in FIG. Thus, the light diffusion film 100 and the specular louver film 10 are laminated so that the arrow A indicating the inclination direction of the columnar object 112 and the arrow B indicating the normal direction of the plate-like mirror surface region 10a are in the same direction. It is preferable to do.
Here, the above-mentioned “same direction” does not require that the arrow A and the arrow B completely coincide with each other, and the acute angle formed by the arrow A and the arrow B is a value within a range of 0 to 30 °. May be.
Ideally, it is preferable that the angle of the external light 3a incident at the incident angle θa shown in FIG. 16 in the medium matches the inclination angle θc of the columnar object.
For example, when the display light 4a is emitted to the front surface of the transflective display body, it is preferable to set the inclination angle θ1 of the plate-like mirror surface region 10a to 1 / 2θc as shown in FIG. . Note that the relationship between θ1 and θc described above does not require perfect coincidence, and allows a width corresponding to the light diffusion angle region of the light diffusion film 100 with respect to θc.
In addition, when it is important not to diffuse the incident external light but to efficiently diffuse the external light reflected by the specular louver film, the inclination angle of the columnar object in the light diffusion film is set to 0 ° or It is preferable to make it a peripheral value (−10 to 10 °).

(2) -4 Film thickness Moreover, in the light-diffusion film which concerns on this aspect, a film thickness shall be a value within the range of 60-700 micrometers.
The reason for this is that when the film thickness of the light diffusion film is less than 60 μm, the incident light traveling straight in the column structure increases and it may be difficult to exhibit a predetermined light diffusion characteristic.
On the other hand, when the film thickness of the light diffusion film exceeds 700 μm, when the column structure is formed by irradiating the composition for light diffusion film with active energy rays, This is because the progress direction of the polymerization is diffused and it may be difficult to form a desired column structure. In addition, the display image may be easily blurred.
Therefore, the film thickness of the light diffusion film is more preferably set to a value within the range of 80 to 450 μm, and further preferably set to a value within the range of 100 to 250 μm.

(2) -5 Manufacturing Method The light diffusion film according to this embodiment is preferably manufactured by a manufacturing method including the following steps (a) to (c).
(A) (Meth) acrylic acid ester containing a plurality of aromatic rings as component (A), urethane (meth) acrylate as component (B), and photopolymerization initiator as component (C). A step of preparing a composition for a light diffusing film comprising (b) a step of applying the composition for a light diffusing film to a step sheet and forming a coating layer (c) a step of irradiating the coating layer with active energy rays Hereinafter, each step will be specifically described with reference to the drawings.

(I) Process (a): Preparation process of the composition for light diffusion films This process is a process of preparing the predetermined composition for light diffusion films.
More specifically, it is a step of mixing the components (A) to (C) and optionally other additives.
In mixing, the mixture may be stirred as it is at room temperature. However, from the viewpoint of improving uniformity, for example, stirring is performed under a heating condition of 40 to 80 ° C. to obtain a uniform mixed solution. Is preferred.
Moreover, it is also preferable to add a dilution solvent so that it may become the desired viscosity suitable for coating.
Hereinafter, the composition for light diffusion films will be described more specifically.

(I) -1 (A) Component (type)
It is preferable that the composition for light diffusion films contains (meth) acrylic acid ester containing a some aromatic ring as (A) component.
The reason for this is that by including a specific (meth) acrylic acid ester as the component (A), the polymerization rate of the component (A) is made faster than the polymerization rate of the component (B), This is because it is presumed that a predetermined difference is caused in the polymerization rate, and the copolymerizability of both components can be effectively reduced.
As a result, when photocured, a plurality of columnar objects having a relatively high refractive index derived from the component (A) are forested in a region where the refractive index derived from the component (B) is relatively low. The column structure can be formed efficiently.
In addition, by including a specific (meth) acrylic acid ester as the component (A), the monomer stage has sufficient compatibility with the component (B), but a plurality of stages in the polymerization process. Then, it is presumed that the column structure can be formed more efficiently by reducing the compatibility with the component (B) to a predetermined range.
Furthermore, by including a specific (meth) acrylic acid ester as the (A) component, the refractive index of the region derived from the (A) component in the column structure is increased, and the refraction of the region derived from the (B) component is increased. The difference from the rate can be adjusted to a value above a predetermined value.
Therefore, by including a specific (meth) acrylic acid ester as the (A) component, coupled with the characteristics of the (B) component described later, a region having a relatively high refractive index derived from the (A) component, B) A column structure composed of a region having a relatively low refractive index derived from the component can be efficiently obtained.
In addition, "(meth) acrylic acid ester containing a plurality of aromatic rings" means a compound having a plurality of aromatic rings in the ester residue portion of (meth) acrylic acid ester.
“(Meth) acrylic acid” means both acrylic acid and methacrylic acid.

  Examples of the (meth) acrylic acid ester containing a plurality of aromatic rings as the component (A) include, for example, biphenyl (meth) acrylate, naphthyl (meth) acrylate, anthracyl (meth) acrylate, Benzylphenyl (meth) acrylate, biphenyloxyalkyl (meth) acrylate, naphthyloxyalkyl (meth) acrylate, anthracyloxyalkyl (meth) acrylate, benzylphenyloxyalkyl (meth) acrylate, or aromatic Examples thereof include those in which a part of hydrogen atoms on the ring are substituted by halogen, alkyl, alkoxy, halogenated alkyl or the like.

  Moreover, it is preferable that the (meth) acrylic acid ester containing a plurality of aromatic rings as the component (A) includes a compound containing a biphenyl ring, and particularly includes a biphenyl compound represented by the following general formula (1). It is preferable.

(In General Formula (1), R ^{1 to} R ¹⁰ are each independent, at least one of R ^{1 to} R ¹⁰ is a substituent represented by the following General Formula (2), and the rest is hydrogen. Atom, hydroxyl group, carboxyl group, alkyl group, alkoxy group, halogenated alkyl group other than fluorine, hydroxyalkyl group, carboxyalkyl group, and any substituent of halogen atom other than fluorine.)

(In General Formula (2), R ¹¹ is a hydrogen atom or a methyl group, carbon number n is an integer of 1 to 4, and repetition number m is an integer of 1 to 10.)

The reason for this is that by including a biphenyl compound having a specific structure as the component (A), a predetermined difference is caused in the polymerization rate of the component (A) and the component (B), and the component (A) and the component (B) This is because it is presumed that the compatibility between the two components can be further reduced by reducing the compatibility with the component to a predetermined range.
Further, the refractive index of the region derived from the component (A) in the column structure can be increased, and the difference from the refractive index of the region derived from the component (B) can be more easily adjusted to a predetermined value or more. it can.

  In addition, specific examples of the biphenyl compound represented by the general formula (1) include compounds represented by the following formulas (3) to (4).

(Molecular weight)
Moreover, it is preferable to make the molecular weight of (A) component into the value within the range of 200-2500.
The reason for this is that when the molecular weight of component (A) is less than 200, the steric hindrance is reduced, so that copolymerization with component (B) is likely to occur, and as a result, the column structure is efficiently formed. This is because it may be difficult to do. On the other hand, when the molecular weight of the component (A) exceeds 2,500, the polymerization rate of the component (A) decreases as the difference in molecular weight with the component (B) decreases. This is because it is presumed that the polymerization rate of the component becomes close and copolymerization with the component (B) is likely to occur, and as a result, it may be difficult to efficiently form the column structure.
Therefore, the molecular weight of the component (A) is more preferably set to a value within the range of 240 to 1500, and further preferably set to a value within the range of 260 to 1000.
In addition, the molecular weight of (A) component can be calculated | required from the calculated value obtained from a molecular composition and the atomic weight of a constituent atom.

(Refractive index)
Moreover, it is preferable to make the refractive index of (A) component into the value within the range of 1.5-1.65.
The reason for this is that if the refractive index of the component (A) is less than 1.5, the difference from the refractive index of the component (B) becomes too small, making it difficult to obtain an effective light diffusion angle region. This is because there are cases. On the other hand, when the refractive index of the component (A) exceeds 1.65, the difference with the refractive index of the component (B) increases, but even an apparent compatibility state with the component (B) is formed. This is because it may be difficult to do.
Therefore, the refractive index of the component (A) is more preferably set to a value within the range of 1.52 to 1.62, and further preferably set to a value within the range of 1.56 to 1.6.
In addition, the refractive index of (A) component mentioned above means the refractive index of (A) component before hardening by light irradiation.
The refractive index can be measured according to, for example, JIS K0062.

(Content)
Moreover, it is preferable to make content of (A) component in the composition for light-diffusion films into the value within the range of 25-400 weight part with respect to 100 weight part of (B) component mentioned later.
The reason for this is that when the content of the component (A) is less than 25 parts by weight, the ratio of the component (A) to the component (B) decreases, and the column structure shown in the sectional view of FIG. This is because the width of the columnar material derived from the component (A) in the case becomes excessively small, and it may be difficult to obtain a column structure having good incident angle dependency. Moreover, it is because the length of the columnar thing in the thickness direction of a light-diffusion film becomes inadequate, and may not show a predetermined light-diffusion characteristic. On the other hand, when the content of the component (A) exceeds 400 parts by weight, the ratio of the component (A) to the component (B) increases, and the width of the columnar material derived from the component (A) is excessive. This is because, on the contrary, it may be difficult to obtain a column structure having a good incident angle dependency. Moreover, it is because the length of the columnar thing in the thickness direction of a light-diffusion film becomes inadequate, and may not show a predetermined light-diffusion characteristic.
Accordingly, the content of the component (A) is more preferably set to a value in the range of 40 to 300 parts by weight, and a value in the range of 50 to 200 parts by weight with respect to 100 parts by weight of the component (B). More preferably.

(I) -2 (B) Component (type)
It is preferable that the composition for light diffusion films contains urethane (meth) acrylate as (B) component.
The reason for this is that if it is urethane (meth) acrylate, the difference between the refractive index of the region derived from the component (A) and the refractive index of the region derived from the component (B) can be adjusted more easily. (B) It is because the dispersion | distribution of the refractive index of the area | region derived from a component can be suppressed effectively, and the light-diffusion film provided with the column structure can be obtained more efficiently.
In addition, (meth) acrylate means both acrylate and methacrylate.

  The urethane (meth) acrylate is (B1) a compound containing at least two isocyanate groups, (B2) a polyol compound, preferably a diol compound, particularly preferably a polyalkylene glycol, and (B3) a hydroxyalkyl (meth). Formed from acrylate.

(Refractive index)
Moreover, it is preferable to make the refractive index of (B) component into the value within the range of 1.4-1.55.
The reason for this is that when the refractive index of the component (B) is less than 1.4, the difference from the refractive index of the component (A) increases, but the compatibility with the component (A) is extremely deteriorated, This is because the column structure may not be formed. On the other hand, when the refractive index of the component (B) exceeds 1.55, the difference from the refractive index of the component (A) becomes too small, making it difficult to obtain the desired incident angle dependency. Because there is.
Therefore, the refractive index of the component (B) is more preferably set to a value within the range of 1.45 to 1.54, and further preferably set to a value within the range of 1.46 to 1.52.
In addition, the refractive index of (B) component mentioned above means the refractive index of (B) component before hardening by light irradiation.
The refractive index can be measured, for example, according to JIS K0062.

The difference between the refractive index of the component (A) and the refractive index of the component (B) is preferably set to a value of 0.01 or more.
The reason for this is that when the difference in refractive index is less than 0.01, the angle range in which incident light is totally reflected in the column structure becomes narrow, and therefore the opening angle in light diffusion may become excessively narrow. Because. On the other hand, if the difference in refractive index is an excessively large value, the compatibility between the component (A) and the component (B) is excessively deteriorated and the column structure may not be formed.
Therefore, the difference between the refractive index of the component (A) and the refractive index of the component (B) is more preferably set to a value in the range of 0.05 to 0.5, More preferably, the value is within the range.
In addition, the refractive index of (A) component and (B) component here means the refractive index of (A) component and (B) component before hardening by light irradiation.

(I) -3 (C) Component (type)
Moreover, it is preferable that the composition for light diffusion films contains a photoinitiator as (C) component.
This is because when the active energy ray is irradiated to the composition for light diffusion film, the refractive index derived from the component (B) is efficiently derived from the component (A). This is because it is possible to form a column structure in which a plurality of pillars having a relatively high refractive index are forested.
Here, the photopolymerization initiator refers to a compound that generates a substance that initiates a polymerization reaction, such as radical species and hydrogen ions, upon irradiation with active energy rays such as ultraviolet rays.

The photopolymerization initiator as the component (C) is at least one selected from the group consisting of an α-hydroxyacetophenone type photopolymerization initiator, an α-aminoacetophenone type photopolymerization initiator, and an acylphosphine oxide type polymerization initiator. It is preferable that
The reason for this is that these photopolymerization initiators can bend the column structure more clearly when used in combination with the component (D), which will be described later. This is because the opening angle of the diffused light at can be expanded more effectively.
That is, with these photopolymerization initiators, when forming a bent column structure, the separation of these components is promoted so that the difference in refractive index between the regions derived from the components (A) and (B) becomes larger. This is because it is presumed to contribute to curing.
Specific examples of the photopolymerization initiator include, for example, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, 2,2-dimethoxy-2-phenyl. Acetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- [4- (methylthio) phenyl ] -2-morpholino-propan-1-one, 4- (2-hydroxyethoxy) phenyl-2- (hydroxy-2-propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4-diethyl Minobenzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tertiarybutylanthraquinone, 2-aminoanthraquinone, 2-methylthioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, benzyldimethyl ketal, acetophenone dimethyl ketal, p-dimethylamine benzoate, oligo [2-hydroxy-2-methyl-1- [4- (1-methylvinyl) phenyl] propane] and the like Of these, one of these may be used alone, or two or more may be used in combination. Among them, the α-hydroxyacetophenone type photopolymerization initiator is preferably 2-hydroxy-2-methyl-1-phenylpropan-1-one.

(Content)
Moreover, content of (C) component in the composition for light-diffusion films is in the range of 0.2-20 weight part with respect to the total amount (100 weight part) of (A) component and (B) component. It is preferable to use a value.
The reason for this is that when the content of the component (C) is less than 0.2 parts by weight, not only is it difficult to obtain a light diffusion film having sufficient incident angle dependency, but the polymerization initiation point is excessive. This is because it may become difficult to sufficiently cure the film. On the other hand, when the content of the component (C) exceeds 20 parts by weight, the ultraviolet absorption in the surface layer of the coating layer becomes excessively strong, and on the contrary, the photocuring of the film is inhibited or the odor becomes excessively strong. This is because the initial yellowness of the film may become strong.
Accordingly, the content of the component (C) is more preferably set to a value within the range of 0.5 to 15 parts by weight with respect to the total amount (100 parts by weight) of the components (A) and (B). More preferably, the value is in the range of 1 to 10 parts by weight.

(I) -4 (D) Component (type)
The light diffusing film composition according to the present invention is particularly suitable when a column structure having a deformed columnar 112 ′ having a bent portion in the middle of the columnar as shown in FIG. It is preferable that an ultraviolet absorber is included as a component.
This is because the active energy ray having a predetermined wavelength can be selectively absorbed in a predetermined range when the active energy ray is irradiated by including an ultraviolet absorber as the component (D). .
As a result, the column structure formed in the film can be bent as shown in FIG. 14 (a) without inhibiting the curing of the light diffusing film composition. Predetermined light diffusion characteristics can be more stably imparted to the diffusion film.

  The component (D) is preferably at least one selected from the group consisting of hydroxyphenyltriazine-based UV absorbers, benzotriazole-based UV absorbers, benzophenone-based UV absorbers, and hydroxybenzoate-based UV absorbers.

  Further, specific examples of the hydroxyphenyltriazine-based ultraviolet absorber preferably include compounds represented by the following formulas (5) to (9).

  Moreover, as a specific example of the benzotriazole ultraviolet absorber, a compound represented by the following formula (10) is preferably exemplified.

(Content)
Further, the content of the component (D) in the composition for light diffusion film is less than 2 parts by weight (however, 0 part by weight with respect to the total amount (100 parts by weight) of the components (A) and (B)). It is preferable to set a value of
The reason for this is that when the content of the component (D) becomes a value of 2 parts by weight or more, the curing of the composition for a light diffusion film is inhibited, and shrinkage wrinkles are generated on the film surface or the film is not cured at all. Because there is. On the other hand, when the content of the component (D) is excessively reduced, it becomes difficult to cause sufficient bending with respect to a predetermined internal structure formed in the film, and a predetermined diffusion structure is obtained with respect to the obtained light diffusion film. This is because it may be difficult to stably provide the light diffusion characteristics.
Therefore, the content of the component (D) is set to a value within the range of 0.01 to 1.5 parts by weight with respect to the total amount (100 parts by weight) of the components (A) and (B). More preferably, the value is more preferably in the range of 0.02 to 1 part by weight.

(I) -5 Other Additives Additives other than the above-described compounds can be appropriately added within a range not impairing the effects of the present invention.
Examples of such additives include hindered amine light stabilizers, antioxidants, antistatic agents, polymerization accelerators, polymerization inhibitors, infrared absorbers, plasticizers, diluent solvents, and leveling agents. .
In addition, generally content of such an additive shall be a value within the range of 0.01-5 weight part with respect to the total amount (100 weight part) of (A) component and (B) component. Is preferable, it is more preferable to set it as the value within the range of 0.02-3 weight part, and it is further more preferable to set it as the value within the range of 0.05-2 weight part.

(Ii) Process (b): Application | coating process This process is a process of apply | coating the composition for light-diffusion films with respect to the process sheet | seat 102, and forming the application layer 101, as shown to Fig.17 (a).
Either a plastic film or paper can be used as the process sheet.
Among these, examples of the plastic film include polyester films such as polyethylene terephthalate films, polyolefin films such as polyethylene films and polypropylene films, cellulose films such as triacetyl cellulose films, and polyimide films.
Examples of the paper include glassine paper, coated paper, and laminated paper.
In consideration of the process described later, the process sheet 102 is preferably a plastic film having excellent dimensional stability against heat and active energy rays.
As such a plastic film, among those described above, a polyester film, a polyolefin film and a polyimide film are preferably exemplified.

In addition, for the process sheet, a release layer is provided on the application surface side of the composition for the light diffusion film in the process sheet in order to easily peel the obtained light diffusion film from the process sheet after photocuring. Is preferred.
Such a release layer can be formed using a conventionally known release agent such as a silicone release agent, a fluorine release agent, an alkyd release agent, or an olefin release agent.
In addition, it is preferable that the thickness of a process sheet | seat is normally set to the value within the range of 25-200 micrometers.

Examples of the method for applying the light diffusing film composition on the process sheet include conventionally known methods such as knife coating, roll coating, bar coating, blade coating, die coating, and gravure coating. Can be performed.
At this time, the thickness of the coating layer is preferably set to a value in the range of 60 to 700 μm.

(Iii) Step (c): Active energy ray irradiation step As shown in FIG. 17B, this step irradiates the coating layer 101 with active energy rays to form a column structure in the film, This is a process for forming a light diffusion film.
More specifically, in the active energy ray irradiation step, parallel light having a high parallelism of light rays is irradiated onto the coating layer formed on the process sheet.

Here, the parallel light means substantially parallel light that does not spread even when the direction of emitted light is viewed from any direction.
More specifically, for example, as shown in FIG. 18 (a), the irradiation light 50 from the point light source 202 is converted into parallel light 60 by the lens 204 and then applied to the coating layer 101, or FIG. 18 (b). As shown in (c), it is preferable to irradiate the coating layer 101 after the irradiation light 50 from the linear light source 225 is converted into parallel light 60 by the irradiation light collimating member 200 (200a, 200b). .

As shown in FIG. 18 (d), the irradiation light collimating member 200 includes a direct light from the linear light source 225 in a direction parallel to the axial direction of the linear light source 225 in which the light direction is random. For example, direct light from the linear light source 225 can be converted into parallel light by unifying the direction of light using the light shielding member 210 such as the plate-like member 210a or the cylindrical member 210b.
More specifically, of the direct light from the linear light source 225, light having low parallelism with respect to the light shielding member 210 such as the plate-like member 210a and the cylindrical member 210b comes into contact with and is absorbed.
Therefore, only light having a high degree of parallelism with respect to the light shielding member 210 such as the plate-like member 210a and the cylindrical member 210b, that is, only parallel light passes through the irradiation light collimating member 200. As a result, the linear light source 225 is obtained. The direct light due to is converted into parallel light by the irradiation light collimating member 200.
The material substance of the light shielding member 210 such as the plate-like member 210a or the cylindrical member 210b is not particularly limited as long as it can absorb light having a low degree of parallelism with respect to the light shielding member 210. A painted Alster steel sheet or the like can be used.

Moreover, it is preferable to make the parallelism of irradiation light into the value of 10 degrees or less.
This is because the column structure can be formed efficiently and stably by setting the parallelism of the irradiation light to a value within this range.
Therefore, the parallelism of the irradiation light is more preferably 5 ° or less, and further preferably 2 ° or less.

As shown in FIG. 19, the irradiation angle θd when the normal angle with respect to the surface of the coating layer 101 is 0 ° is usually in the range of −80 to 80 °. It is preferable to use a value.
The reason for this is that when the irradiation angle is outside the range of −80 to 80 °, the influence of reflection on the surface of the coating layer 101 becomes large, and it may be difficult to form a sufficient column structure. Because there is.

Moreover, as irradiation light, an ultraviolet-ray, an electron beam, etc. are mentioned, However, It is preferable to use an ultraviolet-ray.
The reason for this is that, in the case of electron beams, the polymerization rate is very fast, so the (A) component and the (B) component cannot be sufficiently separated in the polymerization process, making it difficult to form a column structure. Because. On the other hand, when compared with visible light or the like, ultraviolet rays are more abundant in ultraviolet curable resins that can be cured by irradiation and usable photopolymerization initiators, so the components (A) and (B) This is because the range of choices can be expanded.

Further, as the ultraviolet irradiation condition, it is preferable to set the peak illuminance on the surface of the coating layer to a value within the range of 0.1 to 10 mW / cm ² .
This is because when the peak illuminance is less than 0.1 mW / cm ² , it may be difficult to clearly form the column structure. On the other hand, when the peak illuminance exceeds 10 mW / cm ² , it hardens before the phase separation of the component (A) and the component (B) proceeds, and conversely, the column structure can be clearly formed. This is because it may be difficult.
Therefore, it is more preferably set to a value within the range of the peak irradiance 0.3~8mW / cm ² of the coating layer surface in the ultraviolet irradiation, further to a value within the range of 0.5~6mW / cm ² preferable.
The peak illuminance here means a measured value at a portion where the active energy ray irradiated on the surface of the coating layer shows the maximum value.

Moreover, it is preferable to make the integrated light quantity in the coating layer surface in ultraviolet irradiation into the value within the range of 5-200 mJ / cm < ² >.
This is because when the integrated light quantity is less than 5 mJ / cm ² , it may be difficult to sufficiently extend the column structure from above to below. On the other hand, when the integrated light quantity exceeds 200 mJ / cm ² , the resulting light diffusion film may be colored.
Therefore, it is more preferably set to a value within the range of accumulated light amount of 7~150mJ / cm ² in the coating layer surface of the ultraviolet radiation, more preferably to a value within the range of 10 to 100 mJ / cm ^2.
Note that it is preferable to optimize the peak illuminance and the integrated light amount depending on the internal structure formed in the film.

Moreover, it is preferable to move the coating layer formed on the process sheet at a speed of 0.1 to 10 m / min during the ultraviolet irradiation.
This is because mass productivity may be excessively lowered when the speed is less than 0.1 m / min. On the other hand, when the speed exceeds 10 m / min, the coating layer is hardened, in other words, faster than the formation of the column structure. This is because it may be sufficient.
Therefore, it is more preferable to move the coating layer formed on the process sheet at a speed within the range of 0.2 to 5 m / min during the ultraviolet irradiation, and within a range of 0.3 to 3 m / min. More preferably, it is moved at a speed of
In addition, the light-diffusion film after an ultraviolet irradiation process will be in the state which can be finally used by peeling a process sheet | seat.

In addition, a deformed columnar body (112a ″, 112a ″ including a first columnar body located on the first surface side and a second columnar body located on the second surface side as shown in FIG. In the case of forming a column structure having 112b ″), ultraviolet irradiation is performed in two stages.
That is, first ultraviolet irradiation is performed to form the first columnar material at the lower portion of the coating layer, that is, the first surface side, and the column structure unformed region at the upper portion of the coating layer, that is, the second surface side. Leave.
At this time, from the viewpoint of stably leaving the region where the column structure is not formed, it is preferable to perform the first ultraviolet irradiation in an oxygen-existing atmosphere so as to utilize the influence of oxygen inhibition.
Next, second ultraviolet irradiation is performed to form a second columnar object in the region where the column structure is not formed remaining on the second surface side.
At this time, from the viewpoint of stably forming the second columnar body, it is preferable to perform the second ultraviolet irradiation in a non-oxygen atmosphere in order to suppress the influence of oxygen inhibition.

(3) Other light diffusion films Up to now, as a light diffusion film having an internal structure provided with a plurality of regions having a relatively high refractive index in a region having a relatively low refractive index in the film, a column structure is provided. Although the light diffusing film has been described as an example, there are various modes other than the column structure in the predetermined internal structure.
For example, as shown in FIG. 20A, a louver structure 123 in which a plurality of plate-like regions (122, 124) having different refractive indexes are alternately arranged in one arbitrary direction along the film surface as shown in FIG. The light diffusion film 100b having
The light diffusing film has a column structure except that, for example, the irradiation light collimating member in the production of the light diffusing film having the column structure is omitted, and the active energy rays of the linear light source are directly irradiated to the coating layer. It can be manufactured by the same method.
The interval between the plate-like regions in the louver structure is the same as the distance (space) between the columnar objects in the column structure, and the width of the plate-like region in the louver structure is the same as the maximum diameter of the columnar objects in the column structure. . Moreover, the thickness of the louver structure, the inclination angle, the film thickness of the film, and the like can be the same as those of the light diffusion film having the column structure. When the light diffusion film having the louver structure is applied to the present invention, two or more films are laminated and used so that the plate-like regions in the louver structure cross vertically from the viewpoint of light diffusion evenly in the vertical and horizontal directions. It is preferable.
Also, as shown in FIG. 20 (b), a plurality of flaky objects 132 having a relatively high refractive index in a region 134 having a relatively low refractive index are formed in the film. It may be a light diffusion film 100c having a so-called hybrid structure 133 of a column structure and a louver structure, which is arranged in a plurality of rows along one direction.
The light diffusing film is produced by the same method as the light diffusing film having the column structure, for example, except that the interval between the plate-like members of the irradiation light collimating member in the production of the light diffusing film having the column structure is increased by a predetermined amount. be able to.
The details of the structure of the flakes are the same as those of the louver structure described above except that the louver structure is intermittently divided.

Moreover, as shown in FIG.20 (c), the light-diffusion film 100d which has two louver structures in a film may be sufficient.
The light diffusing film omits the irradiation light collimating member, and except that the active energy ray of the linear light source is directly applied to the coating layer, the upper and lower two columns in the single film as shown in FIG. It can be manufactured by the same method as the light diffusion film having a structure. Note that the arrangement of the linear light sources when viewed from above the coating layer is symmetrical when the first-stage louver structure is formed and when the second-stage louver structure is formed with respect to the moving direction of the coating layer. By doing so, a light diffusion film having an internal structure as shown in FIG. 20C is obtained. This structure is preferable because it is not necessary to laminate two or more light diffusion films having the above-described louver structure and there is no fear of delamination.
The details of the internal structure in the film thickness direction are the same as those of the light diffusion film having the column structure shown in FIG. 14B, and the details of the louver structure are the same as those of the louver structure shown in FIG. It is.
Moreover, as shown in FIG.20 (d), the light-diffusion film 100e which has both a louver structure and a column structure in a film may be sufficient.
In addition, since the detail of the manufacturing method and internal structure of the said light-diffusion film is a combination of the content mentioned above, it abbreviate | omits.

5. Display Layer Further, the display layer 20 shown in FIGS. 1B to 1C is not particularly limited as long as it is a layer that represents the display content with characters, designs, etc., but the display content can be freely controlled. Since it can be configured, a laminate of a printing layer 20a, an easy printing layer 20b, and a transparent or translucent resin film 20c made of ink or the like constituting characters, designs, and the like is preferable.
The reason for this is that outside light reflected by the mirror surface louver film or backlight light transmitted through the mirror surface louver film easily passes through the resin film, while characters and designs are not printed. About the part where the design etc. are printed, the transmission of the external light reflected by the specular louver film or the backlight light transmitted through the specular louver film is obstructed, so the visibility of the display content is effectively improved. Because it can.
The display layer may be a printed layer printed directly on a specular louver film or a light diffusion film.
The thickness of the display layer is preferably a value within the range of 10 to 1000 μm, and more preferably a value within the range of 20 to 500 μm.

In addition, as shown in FIG. 21A, the display layer 20 is made up of, for example, a TFT (Thin Film Transistor) substrate 24 and a counter substrate 25 that oppose each other through a predetermined gap, and the TFT substrate 24 and the counter substrate 25. It is also preferable that the liquid crystal display panel 20 includes a liquid crystal layer 26 provided therebetween.
The liquid crystal layer 26 includes, for example, nematic liquid crystal, and has a modulation function of transmitting or blocking light incident on the liquid crystal layer 26 for each pixel by an applied voltage from the drive circuit. The gradation for each pixel is adjusted by changing the light transmission level of the liquid crystal.
In addition to the liquid crystal display panel, an electrophoretic display panel, a MEMS shutter display panel, and an electrowetting display panel can be used.

6). Adhesive Layer As shown in FIGS. 1A to 1C, the specular louver film 10, the light diffusion film 100, and the display layer 20 are preferably laminated via an adhesive layer 30.
The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is not particularly limited as long as it has sufficient pressure-sensitive adhesiveness and transparency. For example, conventionally known acrylic, silicone-based, urethane-based, rubber-based Can be used.
In addition, it is preferable to make the thickness of an adhesive layer into the value within the range of 1-100 micrometers, and it is more preferable to set it as the value within the range of 3-30 micrometers.

7). Other Embodiments Other embodiments of the transflective display body of the present invention will be described with reference to FIG.
That is, FIG. 21B shows the transflective display 1 in a mode in which the light-resistant layer 40 is laminated on the external light incident side.
Thus, by laminating the light-resistant layer on the external light incident side of the transflective display, it is possible to effectively prevent the light diffusion film from being yellowed by ultraviolet rays.
As the light-resistant layer, a resin film in which an ultraviolet absorber is dispersed can be used.

  Hereinafter, the present invention will be described in more detail with reference to examples.

[Example 1]
1. Preparation of light diffusion film (1) Synthesis of low refractive index polymerizable compound (B) component (B1) with respect to 1 mol of polypropylene glycol (PPG) having a weight average molecular weight of 9,200 as component (B2) in the container After containing 2 moles of isophorone diisocyanate (IPDI) as a component and 2 moles of 2-hydroxyethyl methacrylate (HEMA) as a component (B3), the mixture is reacted according to a conventional method to obtain a polyether having a weight average molecular weight of 9,900 Urethane methacrylate was obtained.

In addition, the weight average molecular weight of polypropylene glycol and polyether urethane methacrylate is a polystyrene conversion value measured according to the following conditions by gel permeation chromatography (GPC).
GPC measurement device: manufactured by Tosoh Corporation, HLC-8020
-GPC column: manufactured by Tosoh Corporation (hereinafter, described in order of passage)
TSK guard colmun HXL-H
TSK gel GMHXL (× 2)
TSK gel G2000HXL
・ Measurement solvent: Tetrahydrofuran ・ Measurement temperature: 40 ° C.

(2) Preparation of composition for light diffusing film Next, the formula (3) as the component (A) with respect to 100 parts by weight of the polyether urethane methacrylate having a weight average molecular weight of 9,900 as the component (B) thus obtained. 150 parts by weight of o-phenylphenoxyethoxyethyl acrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., NK ester A-LEN-10) having a molecular weight of 268 and (C) 2-hydroxy-2-methyl- After adding 20 parts by weight of 1-phenylpropan-1-one (8 parts by weight with respect to the total amount (100 parts by weight) of component (A) and component (B)), heating was performed at 80 ° C. Mixing was performed to obtain a composition for a light diffusion film.
The refractive indexes of the components (A) and (B) were measured in accordance with JIS K0062 using an Abbe refractometer (Atago Co., Ltd., Abbe refractometer DR-M2, Na light source, wavelength 589 nm). , 1.58 and 1.46, respectively.

(3) Coating process Next, the obtained composition for light diffusion film was coated on a film-like transparent polyethylene terephthalate sheet (hereinafter referred to as PET) as a process sheet, and a coating layer having a film thickness of 170 μm was formed. Formed.

(4) Active energy ray irradiation step Subsequently, an ultraviolet spot parallel light source (manufactured by JATEC Corporation) whose central ray parallelism was controlled within ± 3 ° while moving the coating layer in the B direction in FIG. Using parallel light with a parallelism of 2 ° or less (main peak wavelength 365 nm, other ultraviolet rays from high-pressure mercury lamps having peaks at 254 nm, 303 nm, and 313 nm), the irradiation angle (θd in FIG. 19) is approximately 10 °. Thus, the coating layer was irradiated.
At that time, the peak illuminance was 2.00 mW / cm ² , the integrated light amount was 53.13 mJ / cm ² , the lamp height was 240 mm, and the moving speed of the coating layer was 0.2 m / min.

Next, a release film (SP-PET 382050, manufactured by Lintec Co., Ltd.) having a thickness of 38 μm was laminated on the exposed surface side of the coating layer in order to surely cure.
Next, the coating layer is completely cured by irradiating the above-mentioned release film with scattered light in which the traveling direction of the parallel light is random so that the peak illuminance is 10 mW / cm ² and the integrated light amount is 150 mJ / cm ^2. A light diffusion film having a thickness of 170 μm excluding the sheet and the release film was obtained.
Further, FIG. 22 (a) shows a schematic view of a cross-sectional view of the obtained light diffusion film cut along a plane parallel to the moving direction of the coating layer and perpendicular to the film surface, and a cross-sectional photograph thereof is shown in FIG. 22 (b). Shown in
Moreover, the cross-sectional photograph of the cross section which cut | disconnected the obtained light-diffusion film in the surface perpendicular | vertical to the moving direction of an application layer and orthogonal to a film surface is shown in FIG.22 (c). 22 (b) and (c), it can be seen that the internal structure of the obtained light diffusion film is a column structure having a deformed columnar body as shown in FIG. 8 (a).
The light diffusing film was cut using a razor, and a cross-sectional photograph was taken by reflection observation using a digital microscope (manufactured by Keyence Corporation, VHX-2000).

(5) Evaluation of light diffusion characteristics (5) -1 Measurement of haze value The haze value of the obtained light diffusion film was measured.
That is, as shown in FIG. 9B, by rotating the obtained light diffusion film, the incident angle θa with respect to the normal of the film surface is −70 to 70 ° along the moving direction B of the coating layer. The haze value (%) with respect to each incident angle θa was measured in accordance with ASTM D 1003 using a modified device manufactured by BYK.
In addition, as shown in FIG. 23 (a), the incident light to the light diffusion film at that time is from the back side of the light diffusion film, that is, from the side opposite to the side irradiated with the active energy rays when manufacturing the light diffusion film. went.
Also in the following embodiments, the incident angle θa having the same inclination as the inclination of the columnar object is expressed as a positive value, and the incident angle θa having an inclination opposite to the inclination of the columnar object is a negative value. It describes as. The obtained incident angle-haze value chart is shown in FIG.
The haze value (%) means a value calculated by the following mathematical formula (1). In the following mathematical formula (1), the diffuse transmittance (%) refers to the parallel light from the total light transmittance (%). The value obtained by subtracting the transmittance (%). The parallel light transmittance (%) means the transmittance (%) of light having a spread up to ± 2.5 ° with respect to the traveling direction of the linearly transmitted light. To do.

(5) -2 Measurement by conoscope Light diffusion characteristics corresponding to the case where the obtained light diffusion film was applied to a reflective display were measured.
In addition, when the light diffusing film is applied to the reflective display body, the display light is diffused and emitted when the transflective display body of the present invention is used in an environment rich in external light (without using backlight light, This corresponds to diffused emission of display light in the case of using external light as a light source.
That is, as shown in FIG. 25, the obtained light-diffusion film 100a was bonded with respect to the specular reflector 10 ', and it was set as the test piece for a measurement.
Next, as shown in FIG. 25, light was incident on the test piece (100a, 10 ′) from the movable light source arm 410 using a reflection mode of a conoscope (manufactured by autonomic-MELCHERS GmbH) 400.
In addition, as shown in FIG. 23 (b), the incident light to the light diffusion film at that time is from the back side of the light diffusion film, that is, from the side opposite to the side irradiated with the active energy rays when producing the light diffusion film. went.
Also in the following embodiments, the incident angle θa having the same inclination as the inclination of the columnar object is expressed as a positive value, and the incident angle θa having an inclination opposite to the inclination of the columnar object is a negative value. It describes as. The obtained conoscopic images are shown in FIGS.
The specular reflector is BV2 made by JDSU Co., Ltd., and the test specimen is a light diffusion film bonded to the aluminum vapor deposition surface of the specular reflector through a 15 μm thick adhesive layer. I got it.

In addition, as shown in FIG. 26 (h), these conoscopic images have a luminance distribution from 0 cd / m ² to the maximum luminance value in each conoscopic image divided into 14 levels from blue to red. 0 cd / m ² is blue, the value exceeding 0 cd / m ² to the maximum luminance value in each conoscopic image is divided into 13 equal parts, and the value approaches 0 cd / m ² to the maximum luminance value. Accordingly, the color changes from blue to light blue to green to yellow to orange to red in 13 stages.
Also, the radially drawn lines in each conoscopic image are each in the direction of azimuth angle 0 ° -180 ° (meaning that they are on a straight line connecting azimuth angle 0 ° and azimuth angle 180 °, and so on). 45 ° -225 ° direction, 90 ° -270 ° direction, 135 ° -315 ° direction, and concentric lines are drawn from the inside in the polar angle direction 18 °, 38 °, 58 °, 78 ° Indicates.
Therefore, the color at the center of each concentric circle in each conoscopic image represents the relative luminance of the diffused light diffused and emitted to the front of the film.
FIG. 27 is an incident angle-luminance chart showing the relationship between the incident angle θa and the luminance (cd / m ² ) at the central portion of each concentric circle in FIGS. From FIG. 26, it can be seen that a wide range of incident light having an incident angle θa = 0 to 50 ° can be efficiently diffused and emitted to the front of the film.

2. Creation of Mirror Surface Louver Film Also, as shown in FIG. 4 (a), an inclination angle θ1 with respect to one side of the polymethyl methacrylate resin film 10b ′ is cured by curing the ultraviolet curable resin brought into close contact with the mold (mold). A concave-convex shape 16 formed by repetition of an inclined surface 12 = 10 ° and an inclined surface 14 having an inclination angle θ2 = 60 ° was formed.
Next, as illustrated in FIG. 4B, the plate-like mirror surface region 10 a was selectively formed only on the inclined surface 12 of the concavo-convex shape 16 by vacuum deposition using aluminum as a deposition source.
Next, as shown in FIG. 4 (c), after applying the light diffusion film composition used when creating the light diffusion film on the concavo-convex shape 16 on which the plurality of plate-like mirror surface regions 10a are formed. Then, it was cured by random light to form a transparent resin layer 10b ″, and a mirror louver film 10 was obtained.
The obtained mirror surface louver film has a plurality of plate-like mirror surface regions made of aluminum having a thickness (L3 in FIG. 5) of 300 nm and a width (L2 in FIG. 5) of 92 μm at an inclination angle (θ1 in FIG. 5) of 10 °. The distance between the plurality of plate-like mirror areas (L1 in FIG. 5) was 17 μm.
Further, the thickness of the mirror louver film (L4 in FIG. 5) is 200 μm, and among these, the thickness of the transparent region below the plate-like mirror region (L5 in FIG. 5) is 100 μm, and the plate-like mirror region The thickness of the transparent region above (L6 in FIG. 5) was 100 μm.
Moreover, the obtained mirror surface louver film changes the film angle so that light is transmitted as shown in FIG. 28 (a) and light is reflected as shown in FIG. 28 (b). It is clear that the mirror louver film is actually obtained as intended.
In FIG. 28 (a), the design of the cardboard box at the back of the specular louver film can be confirmed, whereas in FIG. 28 (b), the design cannot be confirmed, and instead the reflected light from the plate-like specular region is reflected. I can confirm.

3. Manufacture of transflective display body Next, as shown in FIG. 1 (a), the obtained light diffusion film was bonded onto the obtained mirror surface louver film via an adhesive layer having a thickness of 15 μm. A laminate of a light diffusion film and a specular louver film was obtained.
At this time, since the inclination angle of the columnar object in the obtained light diffusion film is 7 ° and is a value around 0 °, the relationship between the inclination direction of the columnar object and the normal direction of the plate-like mirror surface region is The light diffusion film and the specular louver film were laminated without particular consideration (the same applies to Examples 2 to 3 and Comparative Example 1).
Next, the obtained laminate is placed on an edge light type front light (light guide plate built into Kobo glo, manufactured by Kobo Inc.) using LED as a light source through a space, and a transflective display Got the body.
At this time, when viewed from above, the tilt direction from the bottom to the top of the plate-like mirror surface area in the mirror surface louver film, and the tilt direction from the bottom to the top of the backlight light in the edge light type backlight (directivity) And the laminated body and the backlight were arranged so as to coincide with each other (the same applies to Examples 2 to 5 and Comparative Example 2).

4). Evaluation of transflective display (1) Evaluation of display characteristics in an environment rich in external light The obtained transflective display has the display characteristics in an environment rich in external light (in an illuminance of 780 lux). evaluated.
That is, as shown in FIG. 29, the obtained transflective display 1 was placed on a horizontal surface such that the surface of the light diffusion film was on the upper side.
Next, the external light source is located at a position (external light incident angle θa = 0 °) inclined by 0 ° in the direction of arrow C for defining the reference direction with respect to the normal of the surface of the transflective display 1. A linear light source 2 was arranged.
At this time, the linear light source 2 was arranged so as to be parallel to the surface of the transflective display 1 and the axis thereof coincided with the extending direction of the plate-like mirror surface region 10a (perpendicular to the paper surface).
At this time, when viewed from above, the transflective display body 1 has an inclination direction (directivity) from the bottom to the top of the backlight light in the edge light type backlight. (The same applies to Examples 2 to 5 and Comparative Examples 1 and 2).
Next, with the backlight turned off, the transflective display starts from a position (observation angle θ _ob = −5 °) inclined by −5 ° in the direction of arrow C with respect to the normal of the surface of the transflective display 1. While observing the body 1, a photograph was taken. The obtained photograph is shown in (1) in FIG.
In addition, (2) in Fig.30 (a) is the photograph of the reflection type display body of the comparative example 1 mentioned later evaluated side by side for the comparison.
In addition, an arrow C in FIG. 29 is a convenient arrow for defining a reference direction for clarifying a relationship such as an incident direction of external light and an observation direction in the evaluation of the transflective display body.

In addition, the transflective display 1 was observed and photographed in the same manner except that the incident angle θa of external light was changed to 35 °. The obtained photograph is shown in (1) in FIG.
In addition, (2) in FIG.30 (b) is the photograph of the reflection type display body of the comparative example 1 mentioned later evaluated side by side for the comparison.
Further, a photograph of the semi-transmissive display body of Example 1 when the incident angle θa of external light is 30 ° is shown in (1) in FIG. 31A and is evaluated side by side for comparison. A photograph of the transflective display body 4 is shown in (2) in FIG.
Also, a photograph of the transflective reflector of Example 1 when the incident angle θa of external light is 40 ° is shown in (1) in FIG. 31B, and is described later and evaluated side by side for comparison. A photograph of the transflective display body 4 is shown in (2) in FIG.
Further, although partially overlapping, a photograph of the transflective display of Example 1 when the incident angle θa of external light is 30 ° is shown in (1) in FIG. 31 (c), and is arranged for comparison. An evaluated photograph of a transflective display body of Example 5, which will be described later, is shown in (2) in FIG.
Furthermore, although partially overlapping, a photograph of the transflective display of Example 1 when the incident angle θa of external light is 40 ° is shown in (1) of FIG. 31 (d) and is arranged for comparison. An evaluated photograph of a transflective display of Example 5 described later is shown in (2) in FIG.
As shown in (1) in FIGS. 30 (a) to 30 (b) and (1) in FIGS. 31 (a) to (d), the transflective display of Example 1 has an environment rich in outside light. Below, it was confirmed that external light can be efficiently reflected to obtain display light, and excellent display characteristics can be obtained without using a backlight.
That is, in this evaluation, a situation was set in which the transflective display was observed at an observation angle θ _ob = −5 ° in an environment where the incident angle θa of external light was 35 °.
As a result, as shown in (1) in FIG. 30B, the luminance is sufficiently high and uniform under the conditions of the incident angle θa = 35 ° of external light and the observation angle θ _ob = −5 °. It was confirmed that excellent display characteristics with high performance could be obtained.
In addition, it was confirmed that substantially the same excellent display characteristics can be obtained even when the incident angle θa of the external light is changed in the range of 30 to 40 ° which is around 35 °.
On the other hand, when the incident angle θa of the external light is 0 °, which is greatly different from the set 35 °, almost no display light is observed from the observation angle θ _ob = −5 °. The transmissive display body can be determined to be a transflective display body that effectively narrows the incident direction and reflection direction of external light in a specific direction and has high utilization efficiency of external light.
In addition, the incident angle θa = 35 ° of external light and the observation angle θ _ob = −5 ° set in this evaluation are examples, and the inclination angle of the plate-like mirror surface region in the specular louver film and the light diffusion angle in the light diffusion film By changing the region, it is possible to cope with various incident angles θa and observation angles θ _ob of external light.

(2) Evaluation of display characteristics in an environment with insufficient external light The obtained transflective display was evaluated for display characteristics in an environment with insufficient external light.
In other words, except that the linear light source as the external light source was turned off and the backlight was turned on, the transflective display was observed and photographed in the same manner as the evaluation of display characteristics in an environment with abundant external light. Went. The obtained photograph is shown in (1) in FIG.
The illuminance on the surface of the transflective display with the linear light source turned off was 0.1 lux.
In addition, (2) in FIG. 32 is a photograph of a reflection type display body of Comparative Example 1 to be described later evaluated side by side for comparison.
As shown in (1) in FIG. 32, the transflective display of Example 1 efficiently transmits backlight light as display light even in an environment where external light is insufficient. It was confirmed that excellent display characteristics could be obtained.

[Example 2]
In Example 2, a light diffusion film was produced and evaluated in the same manner as in Example 1 except that the light diffusion film was produced as follows.
Moreover, the transflective display body was manufactured and evaluated similarly to Example 1 using the obtained light-diffusion film.

1. Production and Evaluation of Light Diffusing Film In Example 2, when preparing a composition for a light diffusing film, an ultraviolet absorber represented by the formula (10) as a component (D) (manufactured by BSF Corporation, TINUVIN) 384-2) was added in the same manner as in Example 1 except that 0.5 part by weight (0.2 part by weight with respect to the total amount (100 parts by weight) of component (A) and component (B)) was added. Films were manufactured and evaluated. The obtained results are shown in FIGS.
Here, FIG. 33 (a) is a schematic view of a cross section obtained by cutting the obtained light diffusing film along a plane parallel to the moving direction of the coating layer and perpendicular to the film surface, and FIG. It is a cross-sectional photograph.
FIG. 33 (c) is a photograph of a cross section obtained by cutting the obtained light diffusion film along a plane perpendicular to the moving direction of the coating layer and perpendicular to the film surface.
FIG. 34 (a) is an enlarged photograph of the vicinity of the bent portion of the columnar object in the cross-sectional photograph of FIG. 33 (b), and FIG. 34 (b) is a further enlarged portion below the bent portion of the columnar object. It is a photograph. From FIG. 33 (b)-(c) and FIG. 34 (a)-(b), the internal structure in the obtained light-diffusion film is a column structure which has a deformation | transformation columnar body as shown to Fig.14 (a). I understand that.
FIG. 35 is an incident angle-haze value chart of the obtained light diffusion film.
FIGS. 36A to 36G are conoscopic images showing the degree of light diffusion corresponding to the case where the obtained light diffusion film is applied to a reflective display body.
FIG. 37 is an incident angle-luminance chart showing the relationship between the incident angle θa and the luminance (cd / m ² ) at the central portion of each concentric circle in FIGS. From FIG. 37, it can be seen that a wide range of incident light with an incident angle θa = 0 to 60 ° can be efficiently diffused and emitted to the front of the film.

2. Evaluation of transflective display In the transflective display of Example 2, the same evaluation results as the transflective display of Example 1 were obtained.
Accordingly, from the viewpoint of preventing complications, the posting of a photograph of the transflective display is omitted.

[Example 3]
In Example 3, a light diffusion film was produced and evaluated in the same manner as in Example 1 except that the light diffusion film was produced as follows.
Moreover, the transflective display body was manufactured and evaluated similarly to Example 1 using the obtained light-diffusion film.

1. Production and Evaluation of Light Diffusion Film In Example 3, the thickness of the coating layer was changed to 210 μm, and after irradiation with active energy rays, a release film was laminated on the exposed surface side of the coating layer. In this state, instead of irradiating the scattered light, an ultraviolet spot parallel light source (manufactured by JATEC Corporation) with the central ray parallelism controlled within ± 3 ° is used, and the parallel light with a parallelism of 2 ° or less A light diffusion film was produced and evaluated in the same manner as in Example 1 except that the coating layer was irradiated so that (θd in FIG. 19) was approximately 25 °. The film thickness of the obtained light diffusion film was 210 μm. The obtained results are shown in FIGS.
Here, FIG. 38 (a) is a schematic view of a cross section obtained by cutting the obtained light diffusing film along a plane parallel to the moving direction of the coating layer and perpendicular to the film surface, and FIG. It is a cross-sectional photograph.
FIG. 38C is a cross-sectional photograph of a cross section obtained by cutting the obtained light diffusion film along a plane perpendicular to the moving direction of the coating layer and perpendicular to the film surface.
FIG. 39 (a) is an enlarged photograph of the vicinity of the overlapping column structure region where the first columnar object and the second columnar object overlap in the cross-sectional photograph of FIG. 38 (b). ) Is a photograph further enlarging the lower part from the overlapping column structure region. 38 (b) to (c) and FIGS. 39 (a) to (b), the internal structure of the obtained light diffusion film is a column structure having a deformed columnar body as shown in FIG. 14 (b). I understand that.
FIG. 40 is an incident angle-haze value chart of the obtained light diffusion film.
41 (a) to 41 (g) are conoscopic images showing a light diffusion state corresponding to the case where the obtained light diffusion film is applied to a reflective display body.
FIG. 42 is an incident angle-luminance chart showing the relationship between the incident angle θa and the luminance (cd / m ² ) at the central portion of each concentric circle in FIGS. 41 (a) to 41 (g). From FIG. 42, it can be seen that a wide range of incident light with an incident angle θa = 0 to 60 ° can be efficiently diffused and emitted to the front of the film.

2. Evaluation of transflective display The semi-transmissive display of Example 3 gave the same evaluation results as the transflective display of Example 1.
Accordingly, from the viewpoint of preventing complications, the posting of a photograph of the transflective display is omitted.

[Example 4]
In Example 4, a light diffusing film was produced and evaluated in the same manner as in Example 1 except that a light diffusing film was produced as follows.
Moreover, the transflective display body was manufactured and evaluated similarly to Example 1 using the obtained light-diffusion film.

1. Production and Evaluation of Light Diffusing Film In Example 4, acrylic copolymer having a weight average molecular weight of 1,800,000 obtained by polymerization according to a conventional method using butyl acrylate and acrylic acid in a weight ratio of 95: 5 15 parts by weight of tris (acryloxyethyl) isocyanurate (Aronix M-315, molecular weight 423, trifunctional type) manufactured by Toagosei Co., Ltd., benzophenone and 1-hydroxycyclohexylphenyl as a photopolymerization initiator 1.5 parts by weight of a 1: 1 mixture with ketone (Ciba Specialty Chemicals Co., Ltd., Irgacure 500) and trimethylolpropane modified tolylene diisocyanate (Nippon Polyurethane Co., Ltd.) as an isocyanate-based crosslinking agent Manufactured by Coronate L) 0.3 parts by weight and as a silane coupling agent 0.2 parts by weight of 3-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., KBM-403), spherical silicone fine particles (manufactured by GE Toshiba Silicone Co., Ltd., Tospearl 145, average particle size 4 0.5 μm) 18.6 parts by weight and ethyl acetate were added and mixed to prepare an ethyl acetate solution (solid content 14 wt%) of an adhesive material.

Next, the ethyl acetate solution of the obtained adhesive material is knife-type so that the thickness after drying is 25 μm with respect to a polyethylene terephthalate film (Toyobo Co., Ltd., Cosmo Shine A4100) having a thickness of 100 μm. After applying with a coating machine, it was dried at 90 ° C. for 1 minute to form an adhesive material layer.
Next, the 38 μm thick polyethylene terephthalate release film (Lintec Co., Ltd., SP-PET3811) release layer as the release sheet and the obtained adhesive material layer were bonded and bonded. 30 minutes later, the adhesive material layer was irradiated with ultraviolet rays from the release film side using an electrodeless lamp (manufactured by Fusion Co., Ltd.) using an H bulb so that the illuminance was 600 mW / cm ² and the light amount was 150 mJ / cm ² . .
The obtained adhesive material layer after UV curing was used as the light diffusion film of Example 4.
The obtained light diffusion film always had a haze value of about 98% when the incident angle θa was changed in the range of −70 to 70 °.
In Example 4, measurement using a conoscope was omitted.

2. Evaluation of transflective display (1) Evaluation of display characteristics under environment rich in external light Further, as shown in (2) in FIGS. 31 (a) to 31 (b), transflective display of Example 4 When the body is compared with the transflective display body of Example 1 shown in (1) in FIGS. 31 (a) to 31 (b) due to the difference in the light diffusion characteristics of the light diffusion film used, the luminance Although the uniformity was high, it was confirmed that sufficient brightness could not be obtained and it was dark.
In addition, the transflective display of Example 4 also has a higher luminance than the transflective display of Example 1 with respect to the change in the incident angle θa of external light (θa = 30 to 40 °). It was confirmed that the change was large.

(2) Evaluation of display characteristics in an environment with insufficient external light As a result of performing the same evaluation as in Example 1, the transflective display of Example 4 is in an environment with insufficient external light. In addition, it was confirmed that backlight light can be efficiently transmitted to obtain display light, and excellent display characteristics can be obtained.

[Example 5]
In Example 5, a light diffusion film was produced and evaluated in the same manner as in Example 4 except that the amount of spherical silicone fine particles added was reduced.
Moreover, the transflective display body was manufactured and evaluated similarly to Example 1 using the obtained light-diffusion film.

1. Evaluation of Light Diffusion Film The obtained light diffusion film always had a haze value of about 50% when the incident angle θa was changed in the range of −70 to 70 °.
In Example 5 as well, measurement using a conoscope was omitted.

2. Evaluation of transflective display (1) Evaluation of display characteristics in environment rich in outside light As shown in (2) in FIGS. 31 (c) to 31 (d), transflective display of Example 5 The body is sufficient when compared with the transflective display of Example 1 shown in (1) in FIGS. 31 (c) to 31 (d) due to the difference in the light diffusion characteristics of the light diffusion film used. Although the brightness was obtained and bright, it was confirmed that the uniformity of brightness was low.
Further, with respect to a change (30 to 40 °) in the incident angle θa of external light, the transflective display body of Example 5 can suppress the change in luminance in the same manner as the transflective display body of Example 1. Was confirmed.

(2) Evaluation of display characteristics in an environment with insufficient external light As a result of performing the same evaluation as in Example 1, the transflective display of Example 5 is in an environment with insufficient external light. In addition, it was confirmed that backlight light can be efficiently transmitted to obtain display light, and excellent display characteristics can be obtained.

[Comparative Example 1]
Comparative Example 1 was the same as in Example 1 except that a specular reflector (a 100 μm thick PET film with aluminum deposited to a thickness of 300 nm) was used instead of the specular louver film. A reflective display body (because a specular reflector was used, it was not a transflective display body but a reflective display body) was manufactured and evaluated.

1. Evaluation of display characteristics in an environment rich in outside light As shown in (2) in FIGS. 30A to 30B, the reflective display body of Comparative Example 1 is a mirror louver film (plate-like) of Example 1. As shown in (1) in FIGS. 30 (a) to 30 (b) due to the use of a specular reflection plate (inclination angle of the specular reflection plate: 0 °) instead of the specular region inclination angle: 10 °. When compared with the transflective display of Example 1, it was confirmed that effective display characteristics could not be obtained under the conditions of the set external light incident angle θa = 35 ° and observation angle θ _ob = −5 °. It was.

2. Evaluation of display characteristics in an environment with insufficient external light Moreover, as shown in (2) in FIG. 32, the reflective display body of Comparative Example 1 uses a specular reflector instead of a specular louver film. As a result, it was confirmed that backlight light could not be transmitted at all, and consequently display light could not be emitted at all.

[Comparative Example 2]
In Comparative Example 2, a transflective display was manufactured and evaluated in the same manner as in Example 1 except that the light diffusion film was not used.

1. Evaluation of display characteristics in an environment rich in outside light The transflective display of Comparative Example 2 exhibits very glaring and almost mirror-like display characteristics due to the absence of a light diffusing film. It was confirmed that it cannot be applied as a display.

2. Evaluation of display characteristics in an environment with insufficient external light In addition, the transflective display of Comparative Example 2 is very glaring because the light diffusing film is not used and the diffusion characteristics of the backlight itself remain as they are. It was confirmed that the display was not applicable.

As described above in detail, according to the transflective display of the present invention, by using a predetermined specular louver film, it is possible to efficiently reflect external light as display light, and to provide a backlight. The light can be efficiently transmitted and used as display light.
As a result, it has become possible to obtain excellent display characteristics even in an environment with abundant external light or in an environment with insufficient external light.
Therefore, the transflective display according to the present invention is a display in a mobile device whose usage environment changes such as a display used mainly outdoors such as a signboard, an advertisement and a road sign, a mobile phone and a laptop computer. It can be applied to the body and is expected to contribute significantly to these improvements in quality.

1: transflective display, 2: external light source, 3a: external light, 3a ′: reflected external light, 3b: backlight light, 4a: display light derived from external light, 4b: derived from backlight light Display light, 5: observer, 10: specular louver film, 10a: plate-like specular area, 10b: transparent area, 10b ′: transparent resin film, 10b ″: transparent resin layer, 10 ′: specular reflector, 12: Inclined surface on which plate-like mirror surface region is formed, 14: Inclined surface on which plate-like mirror surface region is not formed, 16: Uneven shape, 20: Display layer, 20b: Easy print layer, 20c: Resin film, 24: TFT substrate, 25 : Counter substrate, 26: liquid crystal layer, 30: pressure-sensitive adhesive layer, 40: light-resistant layer, 50: irradiated light from light source, 60: parallel light, 100: light diffusion film, 100a: column structure in the film Light diffusion film having 101: coating layer , 102: process sheet, 112: columnar material having a relatively high refractive index, 113: column structure, 113a: boundary surface of the column structure, 114: region having a relatively low refractive index, 115: first surface, 116 : Second surface, 150: backlight, 152: light source, 154: acrylic plate, 155: reflection dot, 160: light emitted from the light source, 200: irradiation light collimating member, 202: point light source, 204: lens 210: light blocking member, 210a: plate member, 210b: cylindrical member, 225: linear light source, 310: light source, 320: integrating sphere, 400: conoscope, 410: light source arm

Claims (10)

A transflective display body formed by laminating a backlight, a specular louver film, and a light diffusion film,
The specular louver film comprises a transparent region and a plurality of plate-like specular regions fixed to the transparent region,
A transflective display body, wherein the plate-like mirror surface region is arranged in parallel in any one direction along the film surface of the mirror surface louver film.   The plate-like mirror surface region is arranged in parallel so that an angle θ1 formed between a normal line of the plate-like mirror surface region and a normal line of the film surface of the mirror-like louver film is a value within a range of 1 to 40 °. The transflective display according to claim 1.   The transflective display according to claim 1 or 2, wherein the width of the plate-like mirror surface region is set to a value within a range of 1 to 10,000 µm, and the thickness is set to a value within a range of 10 to 10,000 nm. body.   4. The transflective display according to claim 1, wherein the transparent region is made of a transparent resin, and the plate-like mirror surface region is made of a metal vapor deposition film.   5. The transflective display according to claim 1, wherein the thickness of the specular louver film is set to a value within a range of 1 to 10,000 μm.   6. The display layer according to claim 1, further comprising a display layer between the specular louver film and the light diffusing film or on a side opposite to the side where the specular louver film is located in the light diffusing film. The transflective display according to any one of the above.   The light diffusion film is a light diffusion film having an internal structure including a plurality of regions having a relatively high refractive index in a region having a relatively low refractive index in the film. The transflective display according to any one of 6.   The internal structure of the light diffusing film is a column structure in which a plurality of pillars having a relatively high refractive index are forested in the film thickness direction in a region having a relatively low refractive index. The transflective display body according to claim 7.   The film thickness of the light diffusion film is a value within the range of 60 to 700 μm, and the incident angle of the incident light with respect to the normal line of the film surface is changed in the range of −70 to 70 ° along the film longitudinal direction. The transflective display according to claim 8, wherein a haze value for each incident angle is 70% or more.   The transflective display according to any one of claims 1 to 9, wherein the backlight is an edge light type backlight.