Display device

Abstract

Provided is a display device having high reliability and white or light color series seamlessness. According to one embodiment of the present invention, a display device with an optical film laminate is provided with a display device and an optical film laminate laminated on the display body viewing side of the display device, and is characterized in that the optical film laminate has at least a diffusion element layer, a light-transmitting reflective plate, and a first gas layer in this order from the viewing side.

Description

Technical Field

[0001] The present invention relates to a display device. Background Art

[0002] With the popularization of conventional thin displays such as liquid crystal displays and organic EL displays, they are being used in various forms.

[0003] In recent years, there has been an increasing trend toward developing products that utilize thin displays, such as integrated unit panels (i.e., instrument cluster panels), which are a key component of the instrument panel, as part of the display system or the entire panel, or center information displays (CIDs).

[0004] Automobile interiors are primarily black (dark) to prevent external light reflection. However, from a design perspective, a seamless (neutral graying) process is being implemented to minimize the boundary between the front panel, which serves as the outermost surface of the thin-film display's image display, and surrounding materials (such as the interior) to make the front panel's presence less noticeable. For interiors of black-colored automobiles, the front panel of the thin-film display is modified with black to create a seamless, less noticeable boundary.

[0005] Furthermore, the use of thin displays embedded in various home appliances other than televisions and monitors is increasing, and it is expected that thin displays will also be embedded in furniture and in the walls, floors, and ceilings of buildings. Home appliances, furniture, and the walls, floors, and ceilings of buildings are not limited to black (dark colors); many designs use white or light colors.

[0006] Furthermore, in the automotive industry, the development of autonomous driving technology is also driving various research on how to utilize vehicle interior space. As the proportion of human drivers decreases, the possibility of vehicle interiors becoming spaces similar to living rooms in homes is being explored, leading to the use of bright colors such as white or light colors found on residential walls, floors, and ceilings.

[0007] For example, Patent Document 1 discloses an optical laminate composed of a light diffusion layer, a translucent reflector, and an absorptive polarizer laminated in this order from the viewing side. By integrating this optical laminate into an image display device, the display screen exhibits an opaque metallic sheen, harmonizing with the texture of surrounding components such as the frame, achieving a seamless appearance.

[0008] Patent Document 2 discloses a technique for achieving seamless connection with peripheral materials of a display using white or light-colored colors using an optical film laminate composed of a diffusion element layer, a reflective polarizer layer, and a polarizing plate laminated in this order from the viewing side.

[0009] Prior art literature Patent Literature Patent Document 1: Japanese Patent Application Laid-Open No. 2021-86021 Patent Document 2: WO2021 / 187556 Summary of the Invention Problems to be solved by the invention However, display devices using conventional optical film laminates have difficulty in achieving both reliability and seamlessness in white or light-colored displays, and further improvements are needed.

[0010] Therefore, an object of the present invention is to provide a display device having high reliability and seamlessness in white or light colors.

[0011] Means used to solve problems The inventors of the present invention have conducted intensive research and have found that the above-mentioned problems can be solved by a display device having a predetermined layer structure.

[0012] A first aspect of the present invention is a display device with an optical film laminate, comprising a display device and an optical film laminate laminated on a viewing side of a display body of the display device. The optical film laminate includes at least a diffusion element layer, a light-transmitting reflector, and a first gas layer in this order from the viewing side.

[0013] It is preferable that a second gas layer is provided between the diffusion element layer and the light-transmitting reflective plate.

[0014] Preferably, the light-transmitting reflective plate is a reflective polarizer.

[0015] The diffusion element layer is preferably any one of a diffusion film or diffusion adhesive layer in which fine particles are dispersed, a concavo-convex diffusion film having a concavo-convex surface, a porous film, or an anisotropic light diffusion film whose linear transmittance changes according to the incident angle of parallel light.

[0016] Preferably, the haze value of the diffusion element layer is 40% to 95%.

[0017] Preferably, the total light transmittance of the diffusion element layer is 30% to 90%.

[0018] Preferably, the thickness of the first gas layer is 1.5 μm to 5000 μm.

[0019] Preferably, the thickness of the second gas layer is 1.5 μm to 5000 μm.

[0020] The display device with an optical film laminate preferably includes a polarizing plate on a viewing side of a display body of the display device.

[0021] Preferably, the angle formed by the transmission axis of the reflective polarizer and the transmission axis of the polarizing plate is within the range of 0°±30°.

[0022] It is preferable that the outermost surface on the viewing side of the display device with the optical film laminate include a cover plate.

[0023] The display device with an optical film laminate preferably includes a third gas layer between the cover plate and the diffusion element layer.

[0024] Effects of the Invention According to the present invention, a display device having high reliability and seamlessness in white or light colors is provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of an example of a display device with an optical film laminate including a diffusion element layer, a light-transmitting reflector, and a gas layer.

[0026] Figure 2 This is a schematic diagram of an example of a display device with an optical film laminate including a diffusion element layer, a light-transmitting reflector, and a gas layer.

[0027] Figure 3 This is a schematic diagram of an example of a display device with an optical film laminate including a diffusion element layer, a light-transmitting reflective plate, a gas layer, and a cover plate.

[0028] Figure 4 This is a schematic diagram of an example of a display device with an optical film laminate including a diffusion element layer, a light-transmitting reflective plate, a gas layer, and a cover plate.

[0029] Figure 5 This is a schematic diagram of an example of a display device with an optical film laminate including a diffusion element layer, a light-transmitting reflective plate, a gas layer, and a cover plate.

[0030] Figure 6 This is a schematic diagram of an example of a display device with an optical film laminate including a diffusion element layer, a light-transmitting reflective plate, a gas layer, and a cover plate. DETAILED DESCRIPTION

[0031] In the following description, each of an upper limit value and a lower limit value is described to essentially disclose a numerical range including a combination of arbitrary upper limits and arbitrary lower limits.

[0032] In the following description, unless otherwise specified, various measurements were performed at room temperature (23° C.).

[0033] <<Display device 100 with optical film laminate>> The following mainly refers to Figures 1 to 6 , a display device 100 with an optical film laminate according to the present invention will be described.

[0034] like Figure 1 As shown, a display device 100 with an optical film laminate includes a display device 20 and an optical film laminate 10 laminated on the viewing side (display viewing side) of the display device 20. Furthermore, the optical film laminate 10 includes, in order from the viewing side, at least a diffusion element layer 12, a translucent reflector 11, and a first gas layer A. In other words, at least the first gas layer A is interposed between the display device 20 and the translucent reflector 11 of the optical film laminate 10.

[0035] Below, for Figure 1 The structure shown is used as a reference for explanation of how the layer structure can be changed.

[0036] Figure 2 A display device 100 with an optical film laminate (display device 100a with an optical film laminate) is shown, which has an optical film laminate 10 (optical film laminate 10a) and a display device 20. The optical film laminate 10 is constructed to include a diffusion element layer 12, a gas layer B, a translucent reflective plate 11, and a gas layer A in sequence starting from the viewing side.

[0037] Figure 3 A display device 100 with an optical film laminate (display device 100b with an optical film laminate) is shown, which has an optical film laminate 10 (optical film laminate 10b) and a display device 20. The optical film laminate 10 is constructed to include a cover plate 13, a diffusion element layer 12, a translucent reflective plate 11 and a gas layer A in sequence from the viewing side.

[0038] Figure 4 A display device 100 with an optical film laminate (display device 100c with an optical film laminate) is shown, which has an optical film laminate 10 (optical film laminate 10c) and a display device 20. The optical film laminate 10 is constructed to include a cover plate 13, a gas layer C, a diffusion element layer 12, a gas layer B, a translucent reflective plate 11 and a gas layer A in sequence from the viewing side.

[0039] Figure 5A display device 100 with an optical film laminate (display device 100d with an optical film laminate) is shown, which has an optical film laminate 10 (optical film laminate 10d) and a display device 20. The optical film laminate 10 is constructed to include a cover plate 13, a gas layer C, a diffusion element layer 12, a translucent reflective plate 11 and a gas layer A in sequence from the viewing side.

[0040] Figure 6 A display device 100 with an optical film laminate (display device 100e with an optical film laminate) is shown, which has an optical film laminate 10 (optical film laminate 10e) and a display device 20. The optical film laminate 10 is constructed to include a cover plate 13, a diffusion element layer 12, a gas layer B, a translucent reflective plate 11 and a gas layer A in sequence from the viewing side.

[0041] In the following description, the optical film stacks 10a~10e, etc. are not distinguished and are simply recorded as "optical film stack 10", and the display devices 100a~100e, etc. with optical film stacks are not distinguished and are simply recorded as "display device 100 with optical film stacks".

[0042] The specific layer structure of the display device 100 with an optical film laminate will be described below.

[0043] The first gas layer A is preferably maintained by including a first spacer a interposed between the display device 20 and the light-transmitting reflective plate 11 of the optical film laminate 10 in the first gas layer A.

[0044] Here, Figure 1 1 shows a display device 100 with an optical film laminate having a structure in which a diffusion element layer 12 and a light-transmitting reflective plate 11 are adhered to each other (via an adhesive or the like as needed). Figure 2 As shown, the display device 100 with an optical film laminate preferably includes at least a diffusion element layer 12, a translucent reflector 11, and a first gas layer A in this order from the viewing side, with a second gas layer B provided between the diffusion element layer 12 and the translucent reflector 11. In other words, the second gas layer B may be interposed between the diffusion element layer 12 and the translucent reflector 11.

[0045] The second gas layer B is preferably maintained by including a second spacer b interposed between the diffusion element layer 12 and the light-transmitting reflective plate 11 in the second gas layer B.

[0046] like Figure 3 As shown, the optical film laminate 10 has at least a diffusion element layer 12, a translucent reflective plate 11 and a first gas layer A in sequence starting from the viewing side, and can have a cover plate 13 on the outermost surface of the viewing side for the purpose of preventing dirt or scratches on the operating touch panel or the outermost surface.

[0047] In addition, in the embodiment in which the optical film laminate 10 includes at least a cover plate 13, a diffusion element layer 12, a light-transmitting reflective plate 11, and a first gas layer A in this order from the viewing side, as shown in FIG. Figure 4 and Figure 5 As shown, a third gas layer C may be provided between the cover plate 13 and the diffusion element layer 12 . In other words, the third gas layer C may be interposed between the cover plate 13 and the diffusion element layer 12 .

[0048] The third gas layer C is preferably maintained by including a third spacer c interposed between the cover plate 13 and the diffusion element layer 12 in the third gas layer C.

[0049] In addition, in the embodiment in which the optical film laminate 10 includes at least a cover plate 13, a diffusion element layer 12, a light-transmitting reflective plate 11, and a first gas layer A in this order from the viewing side, as shown in FIG. Figure 3 and Figure 6 As shown, a structure without a gas layer between the cover plate 13 and the diffusion element layer 12 (a structure in which the cover plate 13 and the diffusion element layer 12 are in close contact (via an adhesive or the like as needed)) is also within the scope of the present disclosure.

[0050] In addition, in the embodiment in which the optical film laminate 10 includes at least a cover plate 13, a diffusion element layer 12, a light-transmitting reflective plate 11, and a first gas layer A in this order from the viewing side, as shown in FIG. Figure 4 and Figure 6 As shown, a second gas layer B may be provided between the diffusion element layer 12 and the light-transmitting reflective plate 11 .

[0051] In addition, in the embodiment in which the optical film laminate 10 includes at least a cover plate 13, a diffusion element layer 12, a light-transmitting reflective plate 11, and a first gas layer A in this order from the viewing side, as shown in FIG. Figure 3 and Figure 5 As shown, a structure without a gas layer between the diffusion element layer 12 and the translucent reflective plate 11 (a structure in which the diffusion element layer 12 and the translucent reflective plate 11 are in close contact (via an adhesive or the like as needed)) is also within the scope of the present disclosure.

[0052] In addition, the optical film laminate 10 or the display device 100 with an optical film laminate may include other layers.

[0053] The following mainly Figure 4 Taking the optical film laminate 10 shown as an example, each structure will be described in detail.

[0054] <Translucent Reflective Plate 11> The light-transmitting reflective plate 11 is a member having the function of reflecting a portion of the light incident on the optical film laminate 10 and transmitting the remaining light. The light-transmitting reflective plate 11 is a well-known member having light-reflecting and light-transmitting properties. For example, the light-transmitting reflective plate 11 alone has a transmittance of 10% to 70% and a reflectance of 30% or more for incident light.

[0055] Specific examples of the light-transmitting reflective plate 11 include a reflective polarizer, a half mirror, and a louver film. The light-transmitting reflective plate 11 is preferably a reflective polarizer.

[0056] A reflective polarizer reflects polarized light perpendicular to the transmission axis of the polarizer. More specifically, it has a reflection axis that transmits most polarized light parallel to the transmission axis and reflects most polarized light perpendicular to the transmission axis.

[0057] A known reflective polarizer can be used, and is not particularly limited as long as the effects of the present invention are not impaired.

[0058] Examples of the reflective polarizer include the following.

[0059] [Reflective polarizer (1)] A polarizer (specifically, DBEF manufactured by 3M, see Japanese Patent Application Publication No. 4-268505, etc.) is a structure in which two resins with different refractive indices in the stretching direction when stretched (for example, polyethylene naphthalate as the first polymer layer and a copolymer of polyethylene naphthalate as the second polymer layer) are alternately stacked in multiple layers through the extrusion molding technology and then stretched.

[0060] [Reflective polarizer (2)] It is a polarizing film composed of a stacked cholesteric liquid crystal polymer layer and a quarter-wave plate, which separates light incident from the cholesteric liquid crystal polymer layer side into two circularly polarized lights in opposite directions, allowing one circularly polarized light to pass through and reflecting the other circularly polarized light, so that the transmitted circularly polarized light is converted into linearly polarized light by the quarter-wave plate (specifically, there are Nipocs manufactured by Nitto Denko Corporation, Transmax manufactured by Merck, etc., refer to Japanese Patent Publication No. 11-231130, etc.).

[0061] [Reflective polarizer (3)] Reflective grid polarizers include metal grating reflective polarizers that are micro-processed on metal and can emit reflected polarized light even in the visible light range (see U.S. Patent No. 6,288,840, etc.), films in which metal particles are added to a polymer matrix and stretched (see Japanese Patent Publication No. 8-184701, etc.), and resin films with a metal wire grid formed inside by metal nanowires (specifically, WGF manufactured by Asahi Kasei Corporation, see Japanese Patent Publication No. 2017-173832, etc.).

[0062] Among them, the reflective polarizer (1) is preferably used from the viewpoint of excellent productivity and processability. On the other hand, when heat resistance is required, the reflective polarizer (3) is preferably used.

[0063] Here, a preferred embodiment of a reflective polarizer (1) including at least a first polymer layer and a second polymer layer is described in detail.

[0064] The materials of the first and second polymer layers are not particularly limited as long as they do not impair the effects of the present invention. However, from the perspective of productivity, which facilitates molecular orientation during polymer stretching, it is preferred that either the first or second polymer layer be a naphthalene dicarboxylate polymer. Alternatively, both the first and second polymer layers may be naphthalene dicarboxylate polymers. Here, a naphthalene dicarboxylate polymer refers to a polymer containing a naphthalene dicarboxylate functional group within its molecular structure.

[0065] Naphthalene dicarboxylic acid ester polymers can be obtained by polymerizing naphthalene dicarboxylic acid ester monomers. The naphthalene dicarboxylic acid ester monomers that can be used to form the naphthalene dicarboxylic acid ester polymers are not particularly limited as long as the effects of the present invention are not impaired. Examples thereof include naphthalene dicarboxylic acid esters such as 2,6-naphthalene dicarboxylic acid, 1,4-naphthalene dicarboxylic acid, 1,5-naphthalene dicarboxylic acid, 2,7-naphthalene dicarboxylic acid, and 2,3-naphthalene dicarboxylic acid, and esters thereof.

[0066] Polyesters can be formed by polymerizing naphthalene dicarboxylic acid monomers with diols (such as alkane diols and cycloalkane diols). Polyethylene naphthalate is, for example, a copolymer of 2,6-naphthalene dicarboxylic acid, 1,4-naphthalene dicarboxylic acid, 1,5-naphthalene dicarboxylic acid, 2,7-naphthalene dicarboxylic acid, and / or 2,3-naphthalene dicarboxylic acid with ethylene glycol.

[0067] In addition, the naphthalene dicarboxylic acid ester polymer may be a copolymer of 2,6-naphthalene dicarboxylic acid, 1,4-naphthalene dicarboxylic acid, 1,5-naphthalene dicarboxylic acid, 2,7-naphthalene dicarboxylic acid, or 2,3-naphthalene dicarboxylic acid, terephthalic acid, and ethylene glycol. Such a copolymer is generally referred to as coPEN.

[0068] The thickness of each of the first polymer layer and the second polymer layer is not particularly limited.

[0069] For example, a reflective polarizer is made by laminating a first polymer layer and a second polymer layer, then further laminating and stretching multiple layers, repeating this process until the desired thickness is reached. The structure of the first and second polymer layers is typically laminated to approximately 100 layers, making it difficult to measure the thickness of the first and second polymer layers in a reflective polarizer individually.

[0070] The total light transmittance of the reflective polarizer is not particularly limited as long as it does not impair the effects of the present invention. For example, the total light transmittance of the reflective polarizer is preferably 30% to 70%, and more preferably 40% to 60%. When the total light transmittance of the reflective polarizer is within this range, the light emitted from the display can be maintained without weakening, achieving a high whiteness. This allows for a display with excellent visual recognition and a seamless appearance compared to surrounding materials used in white or light-colored displays.

[0071] The total light transmittance of a reflective polarizer can be measured using the method described in JIS K7361-1:1997. However, the light source of the measuring instrument is polarized to a certain extent. Therefore, a measured value unaffected by the polarization of the light source can be obtained by calculating the average value of the value measured using a predetermined configuration and the value measured using a configuration rotated 90° relative to the measuring instrument. Therefore, in this invention, the average of these two total light transmittances is expressed as the total light transmittance.

[0072] The thickness of the translucent reflector 11 (or the thickness of the reflective polarizer) is preferably, for example, 10 μm to 100 μm, more preferably 10 μm to 50 μm, and even more preferably 10 μm to 30 μm from the perspective of thin film production. When the thickness of the translucent reflector 11 (or the thickness of the reflective polarizer) is within this range, sufficient properties (such as reflection and polarization properties) and durability can be achieved, and the display can be made thinner.

[0073] <First Gas Layer A, First Separator a> The first gas layer A is a layer that physically separates the display device 20 from the translucent reflector 11, and contains at least a gas (hereinafter referred to as the first gas). In addition to the first gas, the first gas layer A may also contain a separation member (e.g., a gas) that physically separates the display device 20 from the translucent reflector 11. Figures 1 to 6 However, for the first gas layer A, in order to ensure seamlessness, the area occupied by the first gas is preferably 50% or more, more preferably 80% or more, and even more preferably 90% or more of the actually viewable area, i.e., the effective viewing area, when assembled in a display device with an optical film laminate.

[0074] The first gas is not particularly limited. The first gas may be air or any gas other than air. Examples of gases other than air include nitrogen, oxygen, hydrogen, carbon dioxide, argon, helium, and other industrially available gases. The first gas may be a dry gas.

[0075] The first gas layer A may be a structure that seals the first gas. In other words, the first gas may be sealed in the first gas layer A.

[0076] In a structure where the first gas is sealed, performance changes due to changes in the first gas are less likely to occur, thus improving long-term reliability. On the other hand, in a structure where the first gas layer A cannot be sealed or is difficult to seal, the structure can be simplified, thereby improving productivity.

[0077] The first gas layer A is preferably maintained by including a first spacer a in the first gas layer A. In other words, the display device 20 and the light-transmitting reflective plate 11 are preferably physically separated by the first spacer a.

[0078] The first gas layer A may not have an isolation member (eg Figures 1 to 6 For example, the light-transmitting reflective plate 11 and the display device 20 are fixed to the upper and lower portions of a housing, casing, or frame of a product including the display device 100 with an optical film laminate, with gaps therebetween. This allows the light-transmitting reflective plate 11 and the display device 20 to be physically separated from each other without a spacer member.

[0079] The first spacer a only needs to be able to physically separate the display device 20 from the translucent reflective plate 11 , and its specific structure is not limited in any way.

[0080] Figures 1 to 6 A method is shown in which an outer wall-shaped member serving as an outer frame of the first gas layer A is provided as the first spacer a. In this method, the first spacer a, serving as the outer wall-shaped member, separates the display device 20 from the light-transmitting reflective plate 11, thereby creating a space inside the outer wall-shaped member. This space is then filled with the first gas, thereby forming the first gas layer A.

[0081] Regarding the structure of the first gas layer A, the following methods can also be cited: a method in which an inner wall-shaped member that divides the space between the display device 20 and the translucent reflective plate 11 into multiple layers and supports each layer is provided as a first spacer a, and the space divided by the inner wall-shaped member contains the first gas; and a method in which a plurality of protrusion-shaped members serving as the first spacer a are provided between the display device 20 and the translucent reflective plate 11, and the space outside the area where the protrusion-shaped members are present contains the first gas, etc.

[0082] These methods can be appropriately combined to constitute the first gas layer A.

[0083] As described above, in addition to the first gas, a first spacer a and the like may also be present between the display device 20 and the translucent reflector 11. The volume ratio (first gas occupancy rate) of the first gas (e.g., (thickness of first gas layer A) x (area of ​​the main surface of translucent reflector 11)) of the total volume between the display device 20 and the translucent reflector 11 is preferably 50% or greater, 60% or greater, 70% or greater, 80% or greater, or 90% or greater.

[0084] The first spacer a is preferably constructed to minimize deterioration in the optical properties of the optical film laminate. However, outside the effective viewing area, the optical properties of the first spacer a are not considered. The first spacer a is preferably constructed, for example, from a light-transmitting material. The specific material of the first spacer a is not particularly limited and may be a soft material (adhesive or tape), a hard material (glass or hard resin, etc.), or a combination thereof.

[0085] The thickness of the first gas layer A (or the thickness of the first separator a) is preferably 1.0 μm or more, 1.5 μm or more, 5.0 μm or more, or 10 μm or more, and preferably 5000 μm or less, 1000 μm or less, 500 μm or less, 250 μm or less, or 100 μm or less. By setting it within this range, contact and adhesion between the optical film laminate 10 and the display device 20 caused by bending, etc. can be suppressed, and blurring or interference rainbows can be suppressed during image display.

[0086] The display device 100 with an optical film stack has a first gas layer A, which can reduce deformation at the interface between the optical film stack 10 and the display device 20 (for example, deformation caused by shrinkage stress of the upper polarizer in a transmissive LCD), thereby improving long-term reliability.

[0087] Furthermore, since the display device 100 with an optical film laminate includes the first gas layer A, sufficient whiteness can be easily obtained by reflection at the interface between the display device 20 and the light-transmitting reflective plate 11 .

[0088] <Diffusion Element Layer 12> The diffusion element layer 12 is a layer composed of a diffusion element, which is a member having a function of diffusing light passing therethrough. Hereinafter, the diffusion element layer 12 may also be simply referred to as a "diffusion element."

[0089] The diffusion element layer 12 can be appropriately selected according to desired performance, etc., and is not particularly limited. Preferably, the diffusion element layer 12 is a member corresponding to any one or more of the following diffusion elements (1) to (4).

[0090] [Diffusion element (1)] Diffuser film or diffusion adhesive layer with dispersed particles [Diffusion element (2)] Concave-convex diffuser with a concave-convex surface [Diffusion element (3)] Porous membrane with through-holes or non-through-holes [Diffusion element (4)] Anisotropic light diffusion film with a phase separation structure with different refractive indices inside a light-transmitting resin The diffusion element (1) is an element in which fine particles having a refractive index different from that of a base material such as a binder, adhesive, resin, glass, or nonwoven fabric are dispersed in the base material.

[0091] These can be appropriately combined in consideration of the required light diffusibility performance.

[0092] Examples of the material of the base material of the diffusion element (1) include acrylic adhesives; silicone adhesives; polyurethane adhesives; rubber adhesives; epoxy adhesives; olefin adhesives; polycarbonate resins; (meth)acrylic resins; polystyrene resins; polyolefin resins; polyester resins such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, and polybutylene naphthalate; and various glasses.

[0093] The material of the microparticles used in the diffusion element (1) is not particularly limited as long as it does not impair the effects of the present invention. Examples thereof include inorganic white pigments such as silicon dioxide, calcium carbonate, aluminum hydroxide, magnesium hydroxide, clay, talc, and titanium dioxide; and resin microparticles such as silicone resin, acrylic resin, polystyrene resin, styrene-acrylic copolymer resin, polyethylene resin, and epoxy resin having a refractive index different from that of the binder. These can be used alone or in combination.

[0094] The average particle size of the microparticles is preferably 0.1 μm to 30 μm, more preferably 1 μm to 10 μm. When the average particle size of the microparticles is within this range, light in the visible range can be efficiently diffused, further improving the seamlessness of the display when the power is off. The average particle size of the microparticles is, for example, the D50 (volume basis) value determined by laser diffraction.

[0095] The amount of the microparticles added can be appropriately designed in consideration of the required light diffusing properties, and as an example, when the entire diffusion element (1) is taken as 100 mass %, the amount of the microparticles added can be 1 mass % to 50 mass %. When the amount of the microparticles added is within this range, the microparticles can be fully dispersed in the base material, thereby achieving uniform diffusivity and improving the seamlessness of the display when the power is turned off.

[0096] The diffusion element (2) is an element having a concavo-convex structure provided on the surface of a light-transmitting member such as resin or glass.

[0097] The material of the diffusion element (2) is not particularly limited, and examples thereof include polycarbonate resin; acrylic resin; polystyrene resin; polyolefin resin; polyester resins such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, and polybutylene naphthalate; and various glasses.

[0098] The width, size, number, distribution, density, etc. of the concavo-convex structure can be appropriately set and are not particularly limited. In addition, the cross-sectional shape of the concavo-convex structure can be appropriately changed to a semicircular shape, a polygonal shape, a wave shape, etc.

[0099] Furthermore, the diffusion element (1) which is a diffusion film or a diffusion adhesive layer in which fine particles are dispersed may be a concave-convex diffusion film having a concave-convex shape on its surface, like the diffusion element (2). Furthermore, the diffusion element (2) which is a concave-convex diffusion film having a concave-convex shape on its surface may be a diffusion film in which fine particles are dispersed, like the diffusion element (1). In other words, the diffusion element layer 12 may be formed by a diffusion element that is both the diffusion element (1) and the diffusion element (2).

[0100] The diffusion element (3) is an element having a plurality of through holes or non-through holes extending from one surface of a substrate toward the other surface, and the substrate is formed of a light-transmitting material such as resin or glass.

[0101] The material of the diffusion element (3) is not particularly limited as long as it does not impair the effect of the present invention. Examples thereof include polycarbonate resin; (meth) acrylic resin; polystyrene resin; polyolefin resin; polyester resins such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, and polybutylene naphthalate; various glasses, etc.

[0102] The pores or holes of the diffusion element (3) can be formed by performing a known method such as laser processing on the substrate.

[0103] Alternatively, the diffusion element (3) may be made of porous nonwoven fabric or fiber sheet.

[0104] The shape, size, number, distribution, density, etc. of the pores can be appropriately set and are not particularly limited.

[0105] The diffusion element (4) is an anisotropic light diffusion film having a phase-separated structure with different refractive indices within a light-transmitting resin. The anisotropic light diffusion film is a component whose linear transmittance changes depending on the incident angle of parallel light. More specifically, the anisotropic light diffusion film has a property in which the linear transmittance (amount of incident light transmitted in the linear direction / amount of incident light × 100) changes depending on the incident angle of light.

[0106] An anisotropic light-diffusing film, for example, is made of a light-transmitting resin and comprises a matrix region and a columnar region composed of a plurality of columnar structures having a different refractive index from the matrix region and being phase-separated. The columnar regions composed of the plurality of columnar structures are oriented and extend from one surface (principal surface) of the anisotropic light-diffusing film to the other surface (principal surface). In this manner, the anisotropy is exhibited by the phase separation of the plurality of columnar structures within the resin layer.

[0107] The aspect ratio of the columnar structures when cut along a cross section perpendicular to the extending direction of the plurality of columnar structures can be appropriately set and is not particularly limited.

[0108] The diffusion element (4) can use a conventionally known element. For example, the diffusion element (4) can use a structure disclosed in Japanese Patent Application Laid-Open No. 2015-127819, Japanese Patent Application Laid-Open No. 2021-162733, Japanese Patent Application Laid-Open No. 2022-157897, and the like.

[0109] The thickness of the diffusion element layer 12 is not particularly limited, but is preferably 1 μm to 200 μm, and more preferably 5 μm to 50 μm.

[0110] When the thickness of the diffusion element layer 12 is within this range, sufficient diffusion performance can be achieved and seamlessness when the power is turned off can be improved.

[0111] The haze value of the diffusion element layer 12 is not particularly limited, but is preferably 40% to 95%, more preferably 50% to 95%, further preferably 60% to 95%, and particularly preferably 65% ​​to 95%.

[0112] When the haze value of the diffusion element layer 12 is within this range, the diffusivity is enhanced, thereby improving whiteness and making the image of the display clearer. The haze value of the diffusion element layer 12 can be measured according to the method described in JIS K7136:2000.

[0113] The total light transmittance of the diffusion element layer 12 is not particularly limited unless the effects of the present invention are impaired, but is preferably 30% to 90%, more preferably 40% to 80%, and even more preferably 40% to 70%.

[0114] When the total light transmittance of the diffusion element layer 12 is within this range, the display image has high clarity and excellent diffusivity, resulting in improved whiteness and enhanced seamlessness when the power is turned off. The total light transmittance of the diffusion element layer 12 can be measured according to the method described in JIS K7361-1:1997.

[0115] Furthermore, the diffusion element layer 12 may be used together with a light-transmitting substrate layer such as glass or film. By using such a substrate layer in combination, the diffusion element layer 12 can be made into an independent layer.

[0116] Furthermore, the light-transmitting reflective plate 11 may also serve as a base layer. In this case, for example, a method of coating the light-transmitting reflective plate 11 with a coating material for the diffusion element layer 12 or a method of laminating the diffusion element layer 12 can be mentioned.

[0117] <Second Gas Layer B, Second Separator b> The second gas layer B can have the same structure as the first gas layer A, except that the layers adjacent to the second gas layer B are the light-transmitting reflector 11 and the diffusion element layer 12 . More specifically, it is as follows.

[0118] The gas filling the second gas layer B (hereinafter referred to as the second gas) is not particularly limited.

[0119] The second gas may be air or a gas other than air.

[0120] The second gas may be a dry gas.

[0121] The second gas layer B may have a structure that seals the second gas, or may have a structure that cannot seal or has difficulty sealing the second gas.

[0122] In addition to the second gas, the second gas layer B may also include an isolation member (e.g., Figure 2 、 Figure 4 、 Figure 6 For example, the second gas layer B is preferably maintained by including the second spacer b in the second gas layer B. That is, the second spacer b is preferably used to physically separate the translucent reflector 11 and the diffusion element layer 12.

[0123] The second gas layer B may not have a separating member. For example, the light-transmitting reflective plate 11 and the diffusion element layer 12 may be fixed to the upper and lower portions of a housing, casing, or frame of a product formed by the display device 100 with an optical film laminate, respectively, with gaps therebetween. Thus, even without a separating member, the light-transmitting reflective plate 11 and the diffusion element layer 12 can be physically separated.

[0124] The second spacer b can be used as long as it can physically separate the translucent reflector 11 and the diffusion element layer 12. The specific structure of the second spacer b is not limited. The second spacer b can be an outer wall member (see Figure 2 、 46) Inner wall-shaped member, protrusion-shaped member, etc. These methods can be appropriately combined to form the second spacer b.

[0125] In the second gas layer B, to improve seamlessness, the area actually visible when assembled in a display device with an optical film laminate, i.e., the effective viewing area, is preferably occupied by the second gas layer B (the gas area excluding the spacer supporting the second gas layer B) at least 50%, more preferably at least 80%, and even more preferably at least 90%. In other words, the volume ratio (second gas occupancy rate) of the second gas as a gas to the total volume between the light-transmitting reflector 11 and the diffusion element layer 12 (e.g., (thickness of the second gas layer B) x (area of ​​the main surface of the diffusion element layer 12)) is preferably 50% or more, 60% or more, 70% or more, 80% or more, or 90% or more.

[0126] The second spacer b is preferably constructed to minimize deterioration in the optical properties of the optical film laminate. For example, the second spacer b is preferably constructed of a light-transmitting material. The specific material of the second spacer b is not particularly limited and may be a soft material (adhesive or tape), a hard material (glass or hard resin, etc.), or a combination thereof.

[0127] The thickness of the second gas layer B (or the thickness of the second separator b) is preferably 1 μm or more, 1.5 μm or more, 5 μm or more, or 10 μm or more, and preferably 5000 μm or less, 1000 μm or less, 500 μm or less, 250 μm or less, or 100 μm or less. By setting the thickness within this range, contact and adhesion between the optical film laminate 10 and the display device 20 caused by bending, etc. can be suppressed, and blurring or interference rainbows can be suppressed during image display.

[0128] The ratio of the thickness of the first gas layer A to the thickness of the second gas layer B is preferably 50:1 to 1:50, more preferably 25:1 to 1:25, and particularly preferably 10:1 to 1:10.

[0129] The optical film laminate 10 includes the second gas layer B, whereby the whiteness of the optical film laminate 10 can be further improved.

[0130] In addition, the optical film laminate 10 may not have the second gas layer B. The optical film laminate 10 may not have the second gas layer B. For example, the diffusion element layer 12 and the light-transmitting reflective plate 11 may be directly laminated, or the diffusion element layer 12 and the light-transmitting reflective plate 11 may be laminated via an adhesive layer covering the entire main surface of each layer.

[0131] <Cover 13> The cover sheet 13 is provided to protect the surface of the optical film laminate 10 or to impart other functions such as a touch panel, and is provided on the outermost surface of the optical film laminate 10 on the viewing side.

[0132] The cover plate 13 can be made of a conventionally known member. Specific examples of the cover plate 13 include translucent members such as glass, resin films, or resin plates. The material and thickness of the cover plate 13 can be selected to achieve the desired hardness and optical properties.

[0133] <Third Gas Layer C, Third Separator C> The third gas layer C can have the same structure as the first gas layer A or the second gas layer B, except that the layers adjacent to the third gas layer C are the diffusion element layer 12 and the cover plate 13 . More specifically, it is as follows.

[0134] The gas filling the third gas layer C (hereinafter referred to as the third gas) is not particularly limited.

[0135] The third gas may be air or a gas other than air.

[0136] The third gas may be a dry gas.

[0137] The third gas layer C may have a structure that seals the third gas, or may have a structure that cannot seal or has difficulty sealing the third gas.

[0138] In addition to the third gas, the third gas layer C may also include an isolation member (e.g., Figure 4 、 Figure 5 For example, the third gas layer C is preferably maintained by including a third spacer c in the third gas layer C. That is, the third spacer c is preferably used to physically isolate the diffusion element layer 12 and the cover plate 13.

[0139] The third gas layer C may not have a separator. For example, the diffusion element layer 12 and the cover plate 13 may be fixed with gaps to the upper and lower portions of a housing, casing, or frame of a product formed by the display device 100 with the optical film laminate, thereby physically isolating the diffusion element layer 12 and the cover plate 13 even without a separator.

[0140] The third spacer c can be used as long as it can physically isolate the diffusion element layer 12 and the cover plate 13. The specific structure of the third spacer c is not limited. The third spacer c can be an outer wall member (see Figure 4 、 5 ), an inner wall-shaped member, a protrusion-shaped member, etc. These methods can be appropriately combined to form the third separator c.

[0141] In order to improve seamlessness, the area occupied by the third gas layer C (the gas area excluding the spacer supporting the third gas layer C) within the actual viewable area, or effective viewing area, when assembled in a display device with an optical film laminate is preferably 50% or greater, more preferably 80% or greater, and even more preferably 90% or greater. In other words, the ratio (third gas occupancy) of the volume of the third gas to the total volume between the diffusion element layer 12 and the cover plate 13 (e.g., (thickness of the third gas layer C) x (area of ​​the main surface of the diffusion element layer 12)) is preferably 50% or greater, 60% or greater, 70% or greater, 80% or greater, or 90% or greater.

[0142] The third spacer c is preferably constructed to minimize deterioration in the optical properties of the optical film laminate. For example, the third spacer c is preferably constructed of a light-transmitting material. The specific material of the third spacer c is not particularly limited and may be a soft material (adhesive or tape), a hard material (glass or hard resin, etc.), or a combination thereof.

[0143] The thickness of the third gas layer C (or the thickness of the third separator c) is preferably 1 μm or more, 1.5 μm or more, 5 μm or more, or 10 μm or more, and preferably 5000 μm or less, 1000 μm or less, 500 μm or less, 250 μm or less, or 100 μm or less. By setting the thickness within this range, contact and adhesion between the optical film laminate 10 and the display device 20 caused by bending, etc. can be suppressed, and blurring or interference rainbows can be suppressed during image display.

[0144] The ratio of the thickness of the first gas layer A to the thickness of the third gas layer C is preferably 50:1 to 1:50, more preferably 25:1 to 1:25, and particularly preferably 10:1 to 1:10.

[0145] Furthermore, the ratio of the thickness of the second gas layer B to the thickness of the third gas layer C is preferably 50:1 to 1:50, more preferably 25:1 to 1:25, and particularly preferably 10:1 to 1:10.

[0146] The optical film stack 10 includes the third gas layer C, and thus the whiteness of the optical film stack 10 can be further improved.

[0147] In addition, as described above, the optical film laminate 10 does not need to have the third gas layer C. The optical film laminate 10 may not have the third gas layer C. For example, the diffusion element layer 12 and the cover plate 13 may be directly laminated, or the diffusion element layer 12 and the cover plate 13 may be laminated via an adhesive layer covering the entire main surface of each layer.

[0148] <Display Device 20> The display device 20 is not particularly limited, and a known display device such as a liquid crystal display, an organic EL display, or a micro LED display can be used depending on the application.

[0149] More specifically, the display device 20 includes display panels for automobiles, display panels for home appliances, liquid crystal displays, organic EL displays, micro LED displays, etc. embedded in walls, floors, ceilings, etc. of furniture or buildings.

[0150] Here, although not shown in the drawings, the outermost surface layer on the viewing side of the display device 20 is preferably a polarizing plate.

[0151] A polarizing plate is a plate that allows only light polarized in a specific direction to pass through. A known polarizing plate can be used, and there are no particular limitations as long as the effects of the present invention are not impaired. A polarizing plate commonly used for displays can be used.

[0152] In addition, when the outermost surface layer on the viewing side of the display device 20 is a polarizing plate, the light-transmitting reflective plate 11 is preferably a reflective polarizer.

[0153] The angle formed by the transmission axis of the polarizing plate of the display device 20 and the transmission axis of the translucent reflector 11, which is a reflective polarizer, is preferably within the range of 0°±30°, more preferably within the range of 0°±20°, and even more preferably within the range of 0°±10°. In other words, the angle formed by the transmission axis of the polarizing plate of the display device 20 and the reflection axis of the translucent reflector 11, which is a reflective polarizer, is preferably within the range of 90°±30°, more preferably within the range of 90°±20°, and even more preferably within the range of 90°±10°.

[0154] As described above, by combining the polarizing plate and the light-transmitting reflective plate 11 as a reflective polarizer, the seamlessness with the peripheral members of the display device can be further improved.

[0155] <Other layers> Other layers are not particularly limited and may include adhesive layers, phase difference films, color filters, and the like. Furthermore, other layers may be colored using white or other colored pigments or dyes. This facilitates seamless integration between the display and white or light-colored display peripheral components. These layers may be appropriately positioned between the layers depending on the intended use.

[0156] <<Characteristics of the Optical Film Laminate 10 and the Display Device 100 with the Optical Film Laminate>> <Haze value> The haze value of the optical film laminate 10 is preferably 40% or more, 50% or more, or 60% or more.

[0157] The haze value can be measured using a haze meter (NDH-7000II manufactured by Nippon Denshoku Industries Co., Ltd.) in accordance with JIS K7136:2000.

[0158] <Total light transmittance> The total light transmittance of the optical film laminate 10 is preferably 10% or more, 15% or more, 20% or more, or 25% or more. Additionally, it is preferably 70% or less, 60% or less, or 50% or less.

[0159] The total light transmittance can be measured using a haze meter (NDH-7000II manufactured by Nippon Denshoku Industries Co., Ltd.) in accordance with JIS K7361:1997.

[0160] <Whiteness WI value, Y value, and L*.a*.b*> The whiteness WI value of the optical film laminate 10 is preferably 45 or more, 50 or more, or 55 or more.

[0161] The Y value of the optical film laminate 10 is preferably 45 or more, 50 or more, or 55 or more.

[0162] The L* value of the optical film laminate 10 is preferably 60 or more, 65 or more, or 70 or more.

[0163] The a* value of the optical film laminate 10 is preferably within ±20, within ±10, within ±5, or within ±2.

[0164] The b* value of the optical film laminate 10 is preferably within ±20, within ±10, within ±5, or within ±2.

[0165] The whiteness WI value, Y value, and L* value, a* value, b* value are measured using a spectrophotometer (CM-700d manufactured by KONICA MINOLTA) and are carried out in accordance with ASTM E313-73 standard, JIS Z8722:2009 standard, and JIS Z8781-4 standard in sequence.

[0166] <Ys value (SCE) and ΔY value> The Ys value of the optical film laminate 10 measured by the following method is preferably 105% or more or 110% or more. Additionally, the ΔY value of the optical film laminate 10 measured by the following method is preferably 30 or less or 10 or less.

[0167] For the Y value measured in the SCE (Specular Component Exclude) mode (hereinafter referred to as Y value (SCE)), the Y value (SCE) of each evaluation sample when the Y value (SCE) of the diffusion element 1 is 100% is calculated as the Ys value (SCE), and it is used as an index of brightness.

[0168] Furthermore, a delta Y value was calculated by subtracting the Y value (SCE) from the Y value measured in the SCI (Specular Component Include) mode (hereinafter referred to as Y value (SCI)), and used as an index of the specular reflection component.

[0169] Example Next, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.

[0170] <Fabrication of Diffusion Element 1> The diffusion element layer 1 was formed by applying an acrylic resin coating in which titanium oxide fine particles with a particle size of 4 μm were dispersed onto the treated surface of a 100 μm thick transparent PET film 1 (COSMOSHINE A4301 manufactured by Toyobo Co., Ltd.) and drying the coating. This yielded a 60 mm square diffusion element 1 with a thickness of 110 μm.

[0171] The haze value of the diffusion element 1 is 68%, and the total light transmittance is 45%.

[0172] Furthermore, the haze value and the total light transmittance value were adjusted by the amount of titanium oxide fine particles added.

[0173] <Production of Optical Film Laminate> (Example 1) A reflective polarizer 1 (APF-V3, manufactured by 3M) with a haze value of 0.3% and a total light transmittance of 43% was laminated onto the main surface of the PET film 1 side of the diffuser 1, via a 50 μm thick silicone transparent tape 1 (NSA-50, manufactured by Nippa). Furthermore, a 60 mm square silicone processed transparent tape 1 (NSA-50, manufactured by Nippa) with a 50 mm square cut from the center was laminated onto the main surface of the laminated reflective polarizer 1, to produce an optical film laminate 1.

[0174] (Example 2) The reflection polarizer 1 is laminated on the main surface of the PET film side of the diffusion element 1 via a silicone-processed transparent tape 1. The silicone-processed transparent tape 1 is then laminated on the main surface of the laminated reflection polarizer 1 to obtain an optical film laminate 2.

[0175] (Comparative Example 1) The reflection polarizer 1 was laminated on the main surface of the PET film side of the diffusion element 1 via a silicone-based transparent tape 1. Furthermore, the silicone-based transparent tape 1 was laminated on the main surface of the laminated reflection polarizer 1 side to obtain an optical film laminate 3.

[0176] (Comparative Example 2) The reflection polarizer 1 was laminated on the main surface of the PET film side of the diffusion element 1 via a silicone processed transparent tape 1. Furthermore, the silicone processed transparent tape 1 was laminated on the main surface of the laminated reflection polarizer 1 side to obtain an optical film laminate 4.

[0177] (Example 3) A reflective polarizer 1 was laminated onto the main surface of the diffuser 1 on the PET film side, with a silicone-processed transparent tape 1 interposed therebetween. Furthermore, a cover lens 1, which was a glass plate having a haze value of 0.3% and a total light transmittance of 92%, was laminated onto the main surface of the laminated diffuser 1 on the diffuser layer 1 side, with a silicone-processed transparent tape 1 interposed therebetween. Furthermore, the silicone-processed transparent tape 1 was laminated onto the main surface on the laminated reflective polarizer 1 side, to obtain an optical film laminate 5.

[0178] (Example 4) A reflective polarizer 1 was laminated onto the main surface of the diffuser 1 on the PET film side, with a silicone-processed transparent tape 1 interposed therebetween. Furthermore, a cover lens 1, which was a glass plate having a haze value of 0.3% and a total light transmittance of 92%, was laminated onto the main surface of the laminated diffuser 1 on the diffuser layer 1 side, with the silicone-processed transparent tape 1 interposed therebetween. Furthermore, the silicone-processed transparent tape 1 was laminated onto the main surface on the laminated reflective polarizer 1 side, to obtain an optical film laminate 6.

[0179] <Measurement> (Determination of haze value) The haze values ​​of the diffusing element 1 , the reflective polarizer 1 , the cover lens 1 , and the optical film laminates 1 to 6 were measured using a haze meter (NDH-7000II manufactured by Nippon Denshoku Co., Ltd.) in accordance with JIS K7136:2000.

[0180] At this time, the diffusion element 1 is irradiated with light from the main surface on the PET film side, the reflective polarizer 1 is irradiated with light from the main surface on the opposite side of the main surface stacked on the diffusion element 1 side, the cover lens 1 is irradiated with light from the main surface stacked on the diffusion element 1 side, and the optical film stacks 1 to 4 are irradiated with light from the main surface on the silicone processed transparent tape 1 or silicone transparent tape 1 side which is the outermost surface.

[0181] When the light irradiation surface is the silicone-based processed cellophane tape 1, the light is irradiated into a 50 mm square cutout portion in the center of the surface and the measurement is performed.

[0182] The haze value is the average value of the values ​​obtained when each evaluation sample is measured in an arbitrary initial arrangement and the values ​​obtained when each evaluation sample is measured in an arrangement rotated 90° clockwise from the initial arrangement.

[0183] (Determination of total light transmittance) The total light transmittance of the diffusion element layer 1 , the reflection polarizer 1 , the cover lens 1 , and the optical film laminates 1 to 6 were measured using a haze meter (NDH-7000II manufactured by Nippon Denshoku Co., Ltd.) according to JIS K7361:1997.

[0184] In this case, the surface irradiated with light is the same as that for the measurement of the haze value.

[0185] The total light transmittance is the average value of the value when each evaluation sample is measured in an arbitrary initial arrangement and the value when each evaluation sample is measured in an arrangement rotated 90° clockwise from the initial arrangement.

[0186] (Determination of whiteness WI value, Y value, and L*, a*, b*) Using a spectrophotometer (CM-700d, manufactured by Konica Minolta), the whiteness values ​​(WI), Y values, and L*, a*, and b* of the diffuser element 1, reflective polarizer 1, and optical film laminates 1 to 6 were measured according to ASTM E313-73, JIS Z8722:2009, and JIS Z8781-4, respectively.

[0187] First, the outermost surface of each evaluation sample, the silicone processed cellophane tape 1 or the main surface of the silicone cellophane tape 1, was laminated on the main surface of a transmissive LCD having an upper polarizer on the outermost surface on the viewing side.

[0188] At this time, the transmission axis of the reflective polarizer 1 of each evaluation sample was aligned with the transmission axis of the upper polarizer on the surface of the laminated transmissive LCD.

[0189] Next, with the transmissive LCD in the OFF state, the main surface of each laminated evaluation sample facing the diffusion element layer 1 was measured using a spectrophotometer in both SCI and SCE modes under a D65 light source to obtain whiteness values ​​(WI, Y, and L*, a*, and b*).

[0190] In this case, the whiteness WI value, Y value, and L*, a*, and b* are the average values ​​of the values ​​when the stacked evaluation samples are measured in an arbitrary initial configuration (the transmission axis of the reflective polarizer 1 of each evaluation sample is set to 0°) and the values ​​when the stacked evaluation samples are measured in a configuration rotated 90° clockwise from the initial configuration.

[0191] <Calculation> (Calculation of Ys value (SCE) and △Y value) The Y value (SCE) of each evaluation sample was calculated when the Y value (SCE) of the diffusion element 1 was 100%, and this value was calculated as the Ys value (SCE), which was used as an index of brightness.

[0192] Then, a value obtained by subtracting the Y value (SCE) from the Y value (SCI) was calculated as a ΔY value, and this value was used as an index of the specular reflection component.

[0193] <Experiment> (Reliability test) The whiteness WI value, Y value, and L*, a*, and b* values ​​were measured using evaluation samples of optical film laminates 1 to 6 laminated on the main surface of a transmissive LCD on the upper polarizer side. Each laminate was placed in an 80°C oven for 250 hours, then removed and visually evaluated.

[0194] <Evaluation> A Ys value (SCE) of 110% or more was evaluated as "○", a value of 105% or more and not less than 110% was evaluated as "△", and a value less than 105% was evaluated as "×".

[0195] A △Y value less than 10 is ◎, 10-30 is ○, and more than 30 is ×.

[0196] In the reliability test, those with abnormal appearance such as warping, peeling, or wrinkles were marked as ×, and those without were marked as ◯.

[0197] The haze value, total light transmittance, whiteness WI value, Y value, L*, a*, b*, Ys value (SCE), △Y value and reliability test results obtained in the above examples are summarized in Table 1.

[0198] [Table 1]

[0199] As described above, according to this embodiment, a display device with an optical film laminate having high reliability and seamlessness in white or light colors can be obtained.

[0200] Description of Reference Numerals 100 Display device with optical film laminate 10 Optical film laminate 11 Translucent reflective panels 12 Diffusion element layer 13 Cover A The first gas layer A B Second gas layer B C Third gas layer C 20 Display device.

Claims

1. A display device with an optical film laminate, characterized in that: A display device and an optical film laminate laminated on a viewing side of a display body of the display device, The optical film laminate includes at least a diffusion element layer, a light-transmitting reflector, and a first gas layer in this order from the viewing side.

2. The display device with an optical film laminate according to claim 1, wherein: A second gas layer is provided between the diffusion element layer and the light-transmitting reflective plate.

3. The display device with an optical film laminate according to claim 1 or 2, wherein: The translucent reflective plate is a reflective polarizer.

4. The display device with an optical film laminate according to claim 1 or 2, wherein: The diffusion element layer is any one of a diffusion film or diffusion adhesive layer in which fine particles are dispersed, a concavo-convex diffusion film having a concavo-convex surface, a porous film, or an anisotropic light diffusion film whose linear transmittance changes according to the incident angle of parallel light.

5. The display device with an optical film laminate according to claim 4, wherein: The haze value of the diffusion element layer is 40% to 95%.

6. The display device with an optical film laminate according to claim 4, wherein: The total light transmittance of the diffusion element layer is 30% to 90%.

7. The display device with an optical film laminate according to claim 1, wherein: The thickness of the first gas layer is 1.5 μm to 5000 μm.

8. The display device with an optical film laminate according to claim 2, wherein: The thickness of the second gas layer is 1.5 μm to 5000 μm.

9. The display device with an optical film laminate according to claim 3, wherein: The display device has a polarizing plate on the viewing side of the display body.

10. The display device with an optical film laminate according to claim 9, wherein: The angle formed by the transmission axis of the reflective polarizer and the transmission axis of the polarizing plate is within the range of 0°±30°.

11. The display device with an optical film laminate according to claim 1 or 2, wherein: The outermost surface on the viewing side includes a cover plate.

12. The display device with an optical film laminate according to claim 9, wherein: The outermost surface on the viewing side includes a cover plate.

13. The display device with an optical film laminate according to claim 11, wherein: A third gas layer is provided between the cover plate and the diffusion element layer.

14. The display device with an optical film laminate according to claim 12, wherein: A third gas layer is provided between the cover plate and the diffusion element layer.

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