JP2011192564A - Electro-optical device and lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting system having sufficient practical strength and lighting efficiency. <P>SOLUTION: The lighting system 110 has a structure formed by laminating two resin films 25a, 25b on a panel 18 which is a thin organic EL (electroluminescent) panel. A frame-shaped reinforcing member 28 planarly surrounding a light emitting area V is attached on the light emitting area V side of the laminate structure 25. A reinforcing member 30 covering the entire surface is attached onto a rear surface. The reinforcing members 28, 30 are members for reinforcing the thin-plate-shaped panel 18 and made of a material including a carbon fiber excellent in tensile strength. Reflection layers 28c, 30c are respectively disposed on inner surfaces of the reinforcing members. Owing to the structure, the lighting system 110 attains sufficient practical strength and lighting efficiency. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electro-optical device and an illumination device including the electro-optical device.

A thin panel and a flat panel display used for a mobile phone are required to be thin and lightweight. In addition to being thin and lightweight, it has been proposed to provide flexibility.
For example, Patent Document 1 proposes an organic EL display device in which an organic EL (Electro Luminescence) layer is sandwiched between two glass substrates thinned to 100 μm or less. In addition, this document also describes that a resinous reinforcing layer is provided on the outside of the front and back glass substrates in order to compensate for the lack of strength associated with the reduction in thickness.

Further, in Patent Document 2, as shown in FIG. 14, a liquid crystal display device having a structure in which a liquid crystal panel 90 made of a pair of thin glass substrates is wrapped and laminated with two transparent resin films 95a and 95b from the front and back surfaces. 300 have been proposed. Further, a polarizing plate 91 that also serves as a reinforcing layer is disposed on the front surface of the liquid crystal panel 90, and a resinous reinforcing plate 92 is disposed on the back surface. That is, the liquid crystal panel 90 was laminated by the two resin films 95a and 95b in a state where the resin reinforcing plates were attached to the front and back surfaces.
These reinforcing plates and the reinforcing structure by laminating resin films are considered to supplement the characteristics of the glass substrate, which is relatively strong against compressive stress but very weak against tensile stress. Further, this document also describes that the reinforcing structure can be applied to an organic EL panel.

  In addition, when such a display device is configured using an organic EL panel, it is assumed that the display device is used as a lighting device taking advantage of its self-luminous property. For example, when used as interior lighting of an aircraft, it can be mounted along a curved surface by taking advantage of flexibility, and since it is lighter in weight, an effect of reducing fuel consumption is also expected.

JP 2005-19082 A Japanese Patent No. 4131639

However, there is a problem that it is difficult to obtain sufficient practical strength with a conventional reinforcing structure using a resinous reinforcing plate or a laminate of resin films. In other words, the conventional display device has a problem that it is difficult to achieve both flexibility and practical strength (toughness).
This is because the resinous reinforcing plate or resin film attached to the glass substrate bends following the glass substrate when bending stress is applied. In other words, the reinforcing plate and the resin film are easily bent to the limit point (limit radius) of the glass substrate together with the glass substrate, so that the glass substrate may be cracked and cracked.

Moreover, in the conventional reinforcing structure, since the liquid crystal panel with the reinforcing plates attached to the front and back surfaces is laminated by the two resin films 95a and 95b, the liquid crystal panel 90 is not only thickened. When laminating, there is a problem that a gap G is generated at the peripheral edge of the liquid crystal panel 90.
This gap G becomes a problem particularly when the reinforcing structure is applied to an organic EL panel. Specifically, if a large gap G is formed at the peripheral edge of the organic EL panel, moisture may enter the gap G, leading to deterioration of the organic EL layer.
In addition, since the organic EL panel is a self-luminous device, it generates heat during display (light emission), but the conventional reinforcing structure has a problem that no consideration is given to heat dissipation. In other words, the conventional reinforcing structure has a problem that it is difficult to suppress deterioration due to heat generation of the organic EL panel.

  Further, the conventional display device is not intended for use as the illumination device described above. In other words, the conventional display device has a problem that it is difficult to obtain sufficient illumination efficiency as the illumination device.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following application examples or forms.

(Application example)
A resin film laminated to cover the panel having the electro-optic layer, the first surface on the light emitting region side of the panel, and the second surface facing the first surface, and the resin covering the first surface A reinforcing member provided on the film, wherein the reinforcing member has an opening in the light emitting region of the panel, a third surface facing the first surface of the panel, and a fourth surface facing the third surface. And a reflective layer is formed on at least one of the third surface and the fourth surface of the reinforcing member.

According to this electro-optical device, since the reinforcing member has a frame-like structure on the outer surface of the resin film, the panel is thinner than the conventional display device in which the reinforcing plate is attached to the front and back surfaces of the panel. can do. Therefore, the gap generated at the peripheral edge of the panel when laminating can be reduced.
Further, since the reinforcing member is provided so as to surround the light emitting region of the panel in a planar manner, it is possible to suppress the glass substrate from being bent to the limit point (limit radius), and sufficient practical strength can be obtained. .
Furthermore, since a reflective layer is formed on either the third surface or the fourth surface of the reinforcing member, illumination light emitted from the light emitting region when the electro-optical device is used as an illumination device. A part of the light can be reflected by the reflective layer to be light contributing to illumination. In other words, since the illumination efficiency can be increased by the reflective layer, the illumination efficiency sufficient as the illumination device can be obtained.

Moreover, it is preferable that the reflective layer is formed in the 3rd surface and 4th surface of a reinforcement member.
Further, when the reinforcing member is the first reinforcing member, it is preferable to further include a second reinforcing member provided on a resin film that covers the second surface of the panel.
The second reinforcing member has a fifth surface facing the second surface of the panel and a sixth surface facing the fifth surface, and is reflected on the fifth surface of the reinforcing member. It is preferable that a layer is formed.

Further, the reinforcing member includes a first carbon fiber layer including a plurality of carbon fibers extending in the first direction in a plan view, and a plurality of carbon fibers extending in a second direction intersecting the first direction. It is preferable to include a laminated structure with the second carbon fiber layer.
As described above, the reinforcing member includes a first carbon fiber layer including a plurality of carbon fibers extending in the first direction, and a first carbon fiber including a plurality of carbon fibers extending in the second direction intersecting the first direction. By adopting a structure that includes a laminated structure with two carbon fiber layers, the tensile strength from all directions is increased in a plane, and the glass substrate is the limit point (limit radius) no matter which direction the bending stress is applied to. It is possible to suppress the bending until.
Carbon fiber is a long fiber made from PAN (polyacrylonitrile), pitch, etc., and carbonized with high purity at a high temperature of 1000 ° C. or higher. High tensile strength, low thermal deformation rate (low linear expansion) Coefficient) and high thermal conductivity. By using CFRP (Carbon Fiber Reinforced Plastics) in which such carbon fibers are combined with a binder resin such as epoxy resin, the tensile strength is higher than that of conventional resin reinforcing plates combined with inorganic particles and glass fibers. Even if bending stress is applied in the extending direction of the carbon fiber in a state where a very thin frame-like reinforcing member such as 50 to 200 μm is attached, the glass substrate is the limit point ( Bending to the limit radius) can be suppressed.
Therefore, according to the electro-optical device according to the application example, sufficient practical strength can be obtained.

  Furthermore, since the reinforcing member containing carbon fibers having a thermal conductivity superior to that of the resin has a higher thermal conductivity than the conventional resin reinforcing plate, the heat generated by the panel can be efficiently radiated.

Further, the first carbon fiber layer and the second carbon fiber layer are formed of a prepreg obtained by impregnating carbon fiber with a resin, and the reinforcing member includes three or more layers of the first carbon fiber layer and the second carbon fiber layer. A laminated and cured laminate is preferred. Specifically, each carbon fiber layer is formed using a prepreg obtained by impregnating carbon fiber with an uncured resin as a raw material.
The reinforcing member is preferably made of invar, titanium, or a titanium alloy.
Further, the opening shape of the reinforcing member is preferably provided in the same shape as that of the light emitting region, and the reinforcing member is preferably large enough to cover the end of the panel in plan view.
Moreover, it is preferable that a plurality of mounting holes penetrating the resin film and the reinforcing member are formed in the peripheral portion of the panel.

Moreover, it is preferable that the attachment hole is formed in the shape of a long hole along the side of the panel.
The panel is formed by sandwiching an electro-optic layer between a pair of glass substrates, and the thickness of each glass substrate is preferably 100 μm or less.
Moreover, when the reinforcing member is the first reinforcing member, it is preferable to further include a second reinforcing member provided on a resin film covering the second surface.
Moreover, it is preferable that the reflective layer is formed in the surface by the side of the 1st surface in a 1st reinforcement member, and the surface by the side of the 2nd surface in a 2nd reinforcement member.
The resin film is preferably a polyethylene copolymer material.
The electro-optical layer is preferably an organic EL layer including an organic light emitting layer.

  A resin film laminated to cover the panel having the electro-optic layer, the first surface on the light emitting region side of the panel, and the second surface facing the first surface, and the resin covering the first surface A reinforcing member provided on the film, wherein the reinforcing member has an opening in the light emitting region of the panel, a third surface facing the first surface of the panel, and a fourth surface facing the third surface. An electro-optical device, wherein a reflection layer is formed on at least one of the third surface and the fourth surface of the reinforcing member.

FIG. 6 is a perspective view illustrating one embodiment of a display device according to Embodiment 1; The side sectional view of the display in the ff section of Drawing 1. The enlarged view of the d section in FIG. The schematic diagram which shows the laminated structure of CFRP. The flowchart figure which shows the flow of the manufacturing method of a display apparatus. The figure which shows the manufacture aspect in each process of (a), (b). (A) The top view of the display apparatus which concerns on Embodiment 2, (b); The sectional side view of the display apparatus in the gg cross section of (a). (A)-(c); The enlarged view of the j section in FIG.7 (b). FIG. 7A is an enlarged view of a portion k in FIG. 7B, FIG. 7B is an enlarged view of a portion j in FIG. (A) The top view of the display apparatus which concerns on Embodiment 3, (b); The sectional side view of the display apparatus in the mm cross section of (a). The aspect figure of the interior lighting apparatus of the airplane as an illuminating device. (A) Side sectional drawing of the panel which concerns on the modification 1, (b) (c) Perspective view of a reinforcement member. The side sectional view of the panel concerning modification 2. The sectional side view of the conventional display apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the scale of each layer and each part is different from the actual scale so that each layer and each part can be recognized on the drawing.

(Embodiment 1)
"Overview of display device"
FIG. 1 is a perspective view showing an aspect of the display device according to the present embodiment. FIG. 2 is a side sectional view of the display device taken along the line ff of FIG.
First, the outline | summary of the illuminating device 100 as an electro-optical apparatus which concerns on Embodiment 1 of this invention is demonstrated.

The lighting device 100 is a flexible organic EL lighting device (display device) having a structure in which a panel 18 which is a thin organic EL panel is laminated with two resin films 25a and 25b. In the following description, the laminate structure or the laminated panel 18 is also referred to as a laminate structure 25.
The panel 18 is an organic EL lighting panel including a light emitting region V having a horizontally long rectangle. From the light emitting region V, substantially white light (illumination light) is emitted from the entire surface.
Further, in order to ensure flexibility, the thickness of the pair of substrates constituting the panel 18 is set to 100 μm or less.
In each drawing including FIG. 1, the horizontal direction in the light emitting region V having a horizontally long rectangle is defined as the X-axis direction, and the vertical direction shorter than the horizontal direction is defined as the Y-axis direction. The thickness direction of the panel 18 is the Z-axis direction. Further, the surface on the light emitting region V side of the panel 18 is referred to as a front surface as a first surface, and the opposite surface is referred to as a back surface as a second surface.

Here, a frame-shaped reinforcing member 28 that surrounds the light emitting region V in a planar manner is attached to the surface side of the laminate structure 25. The frame shape is a configuration that covers the panel 18 so that the light emitting region V has an opening. Further, the end portion on the outer periphery of the reinforcing member 28 is configured to cover the end portion (peripheral portion) of the panel 18.
The reinforcing member 28 is a member for reinforcing the thin plate-like panel 18 and is made of a material having excellent tensile strength. For example, it is preferable to use a material containing carbon fiber. In addition, corners R are formed at the four corners of the opening (hole) exposing the light emitting region V.
As shown in FIG. 2, a reflective layer 28 a and a transparent protective layer 28 b are formed in this order on the surface of the reinforcing member 28. In other words, the reflective layer 28 a is formed on the surface (surface) of the reinforcing member 28 that is adjacent to the surface of the panel 18 in a planar manner.
With such a configuration, as shown by the dotted line in FIG. 1, the lighting device 100 has both flexibility that can be bent and practical strength that the panel 18 does not break even when bent. In addition, a part of the illumination light emitted from the light emitting region V can be reflected by the reflective layer 28a of the reinforcing member 28 to be light that contributes to illumination.

Further, attachment holes 3 are formed at the four corners of the reinforcing member 28, respectively. The four attachment holes 3 are through-holes formed in a three-layer structure portion formed by the resin films 25 a and 25 b and the reinforcing member 28 on the outside of the panel 18. With these four mounting holes 3, for example, the lighting device 100 can be fixed with screws to the ceiling or the like.
Note that the number of the mounting holes 3 is not limited to four, and may be appropriately increased or decreased according to the size of the lighting device 100. For example, the mounting hole 3 may be further provided in the approximate center of the long side of the outer shape. Further, by forming a large number of the attachment holes 3 in the side portion, the deformation of the reinforcing member can be promoted, so that the external impact is alleviated and the load concentration on the end portion of the glass substrate is also distributed.

As shown in FIG. 2, the panel 18 includes the element substrate 1 and the sealing substrate 16, and an extended region in which one side of the element substrate 1 extends from the sealing substrate 16 is formed at one end thereof. Has been. One end of the flexible substrate 20 is connected to the overhang region. The flexible substrate is an abbreviation for a flexible printed circuit.
In addition, a plurality of terminals for inputting driving power from the outside are formed at the other end of the flexible substrate 20.

"Detailed Panel Configuration"
FIG. 3 is an enlarged view of a portion d in the panel 18 of FIG.
Next, the detailed configuration of the panel 18 will be described.
The panel 18 is a bottom emission type organic EL lighting panel that emits substantially white illumination light from the light emitting region V on the element substrate 1 side. Further, the panel 18 employs a so-called passive method in which driving power is applied between a pair of anode and cathode electrodes formed on the element substrate 1 and the sealing substrate 16, respectively, so as to drive the lighting. .
The panel 18 includes an element substrate 1, an anode electrode 6, an organic EL layer 8 as an electro-optic layer, a cathode electrode 9, an electrode protective layer 10, a buffer layer 11, a gas barrier layer 12, a filler 13, a sealing substrate 16, and the like. Has been. A portion sandwiched between the element substrate 1 and the sealing substrate 16 is referred to as a functional layer 17. In other words, the laminated structure from the anode electrode 6 to the filler 13 is referred to as a functional layer 17.

The element substrate 1 is made of transparent inorganic glass. In this embodiment, alkali-free glass is used as a suitable example.
The anode electrode 6 is a transparent electrode formed on the element substrate 1 and is made of ITO (Indium Tin Oxide), ZnO, or the like. The planar size is the same as or slightly larger than the light emitting region, and is connected to an anode wiring (not shown) on the element substrate 1.
The organic EL layer 8 is formed so as to cover the anode electrode 6. In addition, in FIG. 3, it is configured as a single layer as shown by a solid line, but actually, as shown by a broken line, each is composed of a hole transport layer made of an organic thin film, a light emitting layer, an electron injection layer, etc. They are laminated in this order on the anode electrode 6.

The hole transport layer is made of a sublimable material such as aromatic diamine (TPAB2Me-TPD, α-NPD).
As a suitable example, the light emitting layer has a multilayer structure including a red light emitting layer, a green light emitting layer, and a blue light emitting layer. Note that the present invention is not limited to this configuration, and any structure and material including a plurality of light emitting layers capable of synthesizing substantially white light may be used.
For example, a laminated structure including two layers of an orange light emitting layer and a blue light emitting layer may be employed, or a structure in which an intermediate layer is interposed between the light emitting layers may be employed. Alternatively, a configuration in which an intermediate charge generation layer is interposed between the light emitting layers, that is, a so-called tandem organic EL layer configuration may be used.
The electron injection layer is made of LiF (lithium fluoride) or the like.
Moreover, each layer which comprises the organic EL layer 8 is formed by laminating | stacking a sublimation material using vapor deposition methods, such as a vacuum vapor deposition method, as a suitable example.

The cathode electrode 9 is a metal layer made of a metal such as MgAg formed so as to cover the organic EL layer 8. A part of the end faces the element substrate 1 and is connected to the cathode wiring.
The electrode protective layer 10 is made of a transparent and high-density material such as SiO ₂ , Si ₃ N ₄ , or SiOxNy that has a function of blocking moisture.
The buffer layer 11 is a transparent organic buffer layer such as a thermosetting epoxy resin.
The gas barrier layer 12 is a sealing layer that is transparent, has a high density, and has a function of blocking moisture, such as SiO ₂ , Si ₃ N ₄ , and SiOxNy, and prevents moisture from entering the organic EL layer 8. Take on the function.
The filler 13 is a transparent adhesive layer made of, for example, a thermosetting epoxy resin, and fills between the gas barrier layer 12 and the sealing substrate 16 and bonds them together. Further, it also functions to prevent moisture from entering the organic EL layer 8 from the outside.
The sealing substrate 16 is made of the same inorganic glass as the element substrate 1.

Further, the sealing substrate 16 and the element substrate 1 are bonded and sealed by a sealing agent 15 formed (applied) on the peripheral edge of the sealing substrate 16. As the sealant 15, an epoxy adhesive, an ultraviolet curable resin, or the like is used.
In addition, a flexible substrate 20 is connected to an overhang region in which one side of the element substrate 1 projects from the sealing substrate 16. The flexible substrate 20 is a flexible substrate in which a wiring pattern such as a copper foil is formed on a base material of a polyimide film, for example, and an anode wiring and a cathode wiring formed on the element substrate 1 and anisotropic conductive bonding Electrical connection is made by a film or the like. Note that the wiring member is not limited to a flexible substrate, and any wiring member capable of transmitting an external driving current may be used. For example, a lead wire may be used.
Here, since the mechanical strength is insufficient only by the connection with the anisotropic conductive adhesive film, conventionally, the connection portion of the flexible substrate 20 is covered and molded with silicon resin (adhesive) or the like to be reinforced. However, there was a problem of easy peeling.
In this embodiment, sufficient practical strength and flexibility are ensured by making the resin film 25a function as an adhesive (filler) instead of this reinforcing structure. The resin film adhesion method (lamination method) will be described later.

In the panel 18 having such a configuration, when driving power is supplied to the flexible substrate 20, the organic EL layer 8 emits light due to the driving current flowing between the anode electrode 6 and the cathode electrode 9. Light is emitted from the light emitting region V.
Specifically, light traveling from the organic EL layer 8 to the anode electrode 6 side passes through the element substrate 1 and becomes illumination light. The light traveling to the cathode electrode 9 side is reflected by the reflective cathode electrode 9, then passes through the organic EL layer 8, and further passes through the anode electrode 6 and the element substrate 1 to become illumination light.
The configuration of the panel 18 is not limited to the bottom emission type, and may be a top emission type. In the case of the top emission type, since the illumination light is emitted from the sealing substrate 16 side, it is necessary to invert the top and bottom of the panel. In addition, a reflective layer is provided below the anode electrode 6 (on the element substrate 1 side), and the thickness of the metal layer constituting the anode electrode 6 is reduced until light transparency is obtained.
Moreover, it is not limited to the structure using two glass substrates, It is good also as a structure of only one glass substrate. In this case, without providing the sealing substrate 16, the thickness of the metal layer constituting the anode electrode 6 and the gas barrier layer 12 is increased, or two gas barrier layers are formed to form two glass substrates. A gas barrier property equivalent to that used can be ensured.
Moreover, it may replace with organic EL and the structure provided with inorganic EL may be sufficient.

"Material of laminate structure and reinforcing member"
Returning to FIG.
Subsequently, the materials of the resin films 25a and 25b and the reinforcing member 28 constituting the laminate structure 25 will be described.
The resin films 25a and 25b to be laminated so as to cover the entire surface of the panel 18 including the region from the light emitting region V to the peripheral edge of the panel 18 from the front and back surfaces are adhesive to the glass substrate and the reinforcing member 28, flexibility, Functions such as transparency (light extraction property), moldability of the flexible substrate 20 (insulation and heat resistance), and water resistance to prevent moisture from entering the inside are required.
In order to satisfy these functions, the resin films 25a and 25b are preferably made of a resin based on polyethylene having water resistance (low water absorption), insulation, flexibility, transparency, and low-temperature weldability. Moreover, it is more preferable that it is a copolymer partially having a polar group in order to improve adhesiveness.

  Specifically, ethylene-vinyl acetate copolymer (EVA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-hydroxyalkyl methacrylate copolymer, ethylene-alkoxy methacrylate alkoxy are used as polyethylene copolymers. Ethyl copolymer, ethylene-aminoethyl methacrylate copolymer, ethylene-hydroxyglycidyl methacrylate copolymer, ethylene-vinyl alcohol copolymer (EVOH), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid It is preferable to use either an acid copolymer (EMAA) or an ethylene-alkyl acrylate copolymer. Alternatively, a copolymer obtained by combining two or more of these (for example, an ethylene-vinyl acetate-vinyl alcohol copolymer is a copolymer excellent in adhesion between both glass and CFRP), or a mixture is used. There may be.

  Moreover, in order to improve heat resistance, you may contain hardening components, such as amine compounds, such as an epoxy compound, an isocyanate compound, and a polyethyleneimine, as a crosslinking agent. In addition, when using the material which has the carboxyl group which is not esterified among ethylene copolymers, such as ethylene-acrylic acid copolymer (EAA) and ethylene-methacrylic acid copolymer (EMAA), low-temperature weldability However, it is preferable to crosslink with heat in combination with a crosslinking component such as an epoxy-based curing agent so that acrylic acid does not remain.

The reinforcing member 28 has a glass substrate end portion that is prone to cracking, a panel warp prevention by a multilayer structure made of a material having a different linear expansion coefficient, and the glass substrate is prevented from being bent to a limit point (limit radius). Therefore, functions such as toughness (tensile resistance) and heat dissipation to dissipate heat generated by the panel 18 are required.
In order to satisfy these functions, a material having a high Young's modulus (10 GPa or more), a low linear expansion coefficient (10 ppm / ° C. or less), and a high thermal conductivity (10 W / m · k or more) is preferable.
In this embodiment, as a suitable example, CFRP (Carbon Fiber Reinforced Plastics) having both excellent tensile strength and heat dissipation is used as the material of the reinforcing member 28. Since CFRP has a low density (1.5 to 2.0 g / cm ³ ) and a high tensile strength (1000 MPa or more), high strength reinforcement is possible even if it is made thin, and it is lightweight. It is suitable as a material for the reinforcing member 28.

FIG. 4 is a schematic view showing a laminated structure of CFRP.
CFRP is a composite material composed of carbon fiber and resin, and is a precursor called prepreg in which carbon fiber aligned in one direction is impregnated with thermosetting resin such as epoxy resin or phenol resin, or thermoplastic such as polyester. It is a composite material in which two or more layers (carbon fiber layers) are laminated in different directions and cured.
Specifically, as shown in FIG. 4, a precursor including a plurality of carbon fibers extending in the X-axis direction is a carbon fiber layer h (first carbon fiber layer), and a plurality of precursors extending in the Y-axis direction. When the carbon fiber layer i (second carbon fiber layer) is used as the precursor containing the carbon fiber, four layers of the carbon fiber layer h and the carbon fiber layer i are alternately stacked, and then pressurization and heating (for example, 120 to 180 ° C.) and CFRP cured in a plate shape is used for the reinforcing member 28. In addition, in FIG. 4, the line segment shown by stripe form has shown the extending direction of carbon fiber. Further, although the layers are drawn apart for the sake of clarity, they are actually a laminated body that is bonded (contacted) and integrated.
Further, as the carbon fiber, it is preferable to use a PAN (polyacrylonitrile) -based carbon fiber or a pitch (petroleum resin) -based carbon fiber.

In the present embodiment, CFRP having a four-layer structure is adopted as a suitable example, but it is only necessary to include a laminated structure in which two or more carbon fiber layers having different carbon fiber extending directions are laminated. In other words, what is necessary is just to include the laminated structure which consists of two carbon fiber layers piled up so that the extending direction of each carbon fiber may cross | intersect.
Further, when the X-axis direction is about 0 degrees, the basic structure is a front and back symmetrical stacking order in which the extending direction of the carbon fibers is about 0 degrees, about 90 degrees, about 90 degrees, and about 0 degrees. However, the present invention is not limited to this. For example, the stacking order of about 0 degrees, about 90 degrees, about 0 degrees, about 90 degrees, and the stacking of about 0 degrees, about 0 degrees, about 90 degrees, about 90 degrees It may be in order.
Also, in the case of 3 layers, the stacking order is 0 degree, 90 degrees, 0 degrees, and in the case of 6 layers, it is a front / back symmetrical structure such as 0 degrees, 90 degrees, 0 degrees, 0 degrees, 90 degrees, 0 degrees. The order of lamination is fundamental, but these are not limited as described above.
Even if it is these structures, the expected function as the reinforcement member 28 is securable. Specifically, with respect to the tensile strength, 1000 MPa or more can be secured in substantially all planar directions.
Regarding heat dissipation, carbon fiber made of high-purity carbon is high-purity carbon, so heat conduction is 20 to 60 W / m · k, glass (1 W / m · k) and general-purpose plastic (about 0.5 w / k). Since it is higher than m · k), sufficient heat dissipation can be obtained. Furthermore, the outermost surface of the CFRP may be processed so as to increase the surface area by providing an uneven shape on the surface in order to further increase the heat radiation to the atmosphere.

Returning to FIG.
On the surface of the reinforcing member 28, a reflective layer 28a and a protective layer 28b are formed in this order.
The reflection layer 28a is a metal reflection layer. As a preferred example, an aluminum thin film layer is formed on the surface of the reinforcing member 28 by a vapor deposition method such as a vacuum vapor deposition method. The method is not limited to the vapor deposition method. For example, the metal thin film layer may be formed on the surface of the reinforcing member 28 by pressing a metal foil by pressing or the like.
The protective layer 28b is a transparent resin coat layer for protecting the reflective layer 28a from being damaged. As a preferred example, an acrylic resin is applied by a spin coat method or the like and then cured to form a clear hard coat layer.

An optical film 35 that covers the light emitting region V is attached to the opening (hole) of the reinforcing member 28 on the surface.
The optical film 35 is provided for reinforcing the strength and protecting the display surface.
In the present embodiment, as a suitable example, PET (polyethylene terephthalate) having excellent transparency is used for the optical film 35. An antireflection layer (AR) having a multilayer structure of inorganic oxides having different refractive indexes is formed on the surface.
The material of the optical film 35 is not limited to PET, and any material having transparency may be used. For example, PEN (polyethylene naphthalate), TAC (triacetyl cellulose), COP (cyclic olefin polymer) or the like is used.
The surface treatment of the optical film 35 is not limited to the antireflection treatment, and various treatments can be performed. For example, a hard coat process for improving wear resistance by forming a hard coat layer such as PMMA, an antireflection process for forming a low antireflective layer (LR) made of a low refractive index fluororesin, and providing unevenness on the surface Surface treatments such as anti-glare treatment, antistatic treatment for forming an antistatic layer to prevent adhesion of dust, and oil repellent treatment for forming an oil repellent layer to which sebum hardly adheres may be performed.

  In addition, in FIG. 2, the configuration in which the reflective layer 28 a is formed on the surface (fourth surface) of the reinforcing member 28 as a preferred example has been described. However, the configuration is not limited to this configuration. The reflective layer 28a may be formed on the surface. In other words, a reflective layer may be formed on either the front surface or the back surface of the reinforcing member 28. Even when a reflective layer is formed on the back surface of the reinforcing member 28, a part of the illumination light emitted from the light emitting region V can be reflected by the reflective layer to be light contributing to illumination.

“About the thickness of each part”
Returning to FIG.
Here, the optimum thickness of each part necessary for the lighting device 100 to achieve both flexibility and practical strength (toughness) will be described.
First, the thickness of the panel 18 will be described.
In FIG. 3, in order to clarify the stacking relationship between the constituent parts, in particular, the scale of the functional layer 17 is enlarged as compared with other parts, but in reality, the functional layer 17 is configured to be the thinnest part. become. The thickness of the functional layer 17 is about several μm to 20 μm. Among these, the buffer layer 11 occupies more than half the thickness. Incidentally, the thickness of the organic EL layer 8 composed of a plurality of thin films with a thickness of the order of nm is less than 1 μm. As described with reference to FIG. 3, the panel 18 is filled with an all-solid substance having no hollow structure between the substrates in order to obtain adhesive strength that can withstand flexibility.

In the present embodiment, as a preferable example, the thicknesses of the element substrate 1 and the sealing substrate 16 are each about 40 μm. The total thickness of the panel 18 is about 90 μm as a preferred example. According to the experiment results of the inventors, in order to ensure the reliability of the organic EL panel, in addition to the sealing structure such as the gas barrier layer 12, the thickness of the element substrate 1 and the sealing substrate 16 is about 10 μm or more. I know it is necessary. In other words, by setting the thicknesses of the element substrate 1 and the sealing substrate 16 to about 10 μm or more, it is possible to ensure impact strength sufficient to withstand flexibility and sufficient moisture resistance.
On the other hand, when the thickness of the element substrate 1 and the sealing substrate 16 is about 100 μm or more, it is understood that flexibility is impaired.
For this reason, it is preferable to set the thickness of the element substrate 1 and the sealing substrate 16 within a range of 10 to 100 μm. In consideration of the balance between strength and flexibility, it is more preferable that the thickness be in the range of 20 to 80 μm.
Furthermore, the total thickness of the panel 18 in which the element substrate 1 and the sealing substrate 16 are overlapped is preferably set in a range of 50 to 120 μm in consideration of a balance between strength and flexibility.

  The element substrate 1 and the sealing substrate 16 are thinned by polishing or etching each having a thickness of about 0.3 to 0.7 mm in the initial stage. Preferably, a panel having a desired thickness is manufactured by manufacturing a panel in which the front and back glass substrates are thick and then etching using an etching solution (aqueous solution) in which hydrofluoric acid (hydrofluoric acid) is dissolved. To do. Note that the present invention is not limited to this method, and any method capable of forming the panel 18 having a desired thickness may be used. For example, a mechanical polishing method may be used.

Returning to FIG.
The thickness of the optical film 35 is about 20-50 micrometers as a suitable example. This is because a general transparent resin including PET has a large linear expansion coefficient (20 to 80 ppm / ° C.), expands due to heating at the time of laminating, and shrinks when it returns to room temperature. There is. Therefore, if the optical film is made as thin as possible, the shape retaining force of the CFRP that is the reinforcing member becomes superior. Therefore, the optical film is less likely to shrink even when the temperature is returned to room temperature, and the panel is prevented from warping. However, in the case of an optical film having a thickness of 20 μm or less, surface coating processing such as a hard coat layer or an antireflection layer becomes difficult, so 20 to 50 μm is preferable. This thickness depends on the thickness of the reinforcing member, and it is necessary to make the optical film thinner than the reinforcing member. For example, if the thickness of the reinforcing member is about 200 μm, the thickness of the optical film is preferably in the range of 20 to 100 μm.
Further, the size of the planar optical film 35 is made slightly larger than the light emitting region V, and the reinforcing member 28 is overlaid on the peripheral edge of the film. With this configuration, workability at the time of setting the optical film 35 is improved.

Next, the thickness of the resin films 25a and 25b constituting the laminate structure 25 will be described.
In the present embodiment, as a suitable example, an EVA film having a thickness of about 50 μm is used for the resin films 25a and 25b. According to the results of experiments by the inventors, it has been found that a thickness of about 20 μm or more is required to satisfy the coverage (fillability) of the step including the gap at the peripheral edge of the panel 18.
Considering the balance between the coverage and the total thickness of the lighting device 100, it is preferably in the range of 20 to 100 μm. Moreover, when the cost of a resin film and the ease (workability | operativity) of lamination are considered, it is preferable to exist in the range of 40-80 micrometers.

Subsequently, the thickness of the reinforcing member 28 will be described.
In this embodiment, as a preferred example, CFRP having a four-layer structure and a thickness of about 100 μm is used for the reinforcing member 28.
The CFRP can be formed as long as it has a thickness of about 25 μm or more. However, in a state where the CFRP is attached to the laminate structure 25 (including the panel 18) set to the above-described thickness, flexibility and practical strength are provided. In order to ensure (toughness), it is necessary to set the thickness within a range of 50 to 200 μm.
And the total thickness of the illuminating device 100 formed by laminating | stacking these members will be about 290 micrometers in the thickest part. The peripheral portion of the panel 18 where the panel 18 and the reinforcing member 28 overlap is the thickest portion.
Note that the dimensions of the above preferred examples are one of preferred examples derived by the inventors from the experimental results and physical property data after creative ingenuity, and are not limited thereto. Within the range, dimensions can be set according to the application.

"Manufacturing method of display device"
FIG. 5 is a flowchart showing a flow of a manufacturing method of the display device. 6 (a) and 6 (b) are diagrams showing manufacturing modes in each step.
Here, the manufacturing method of the illuminating device 100 is demonstrated in detail along the flowchart of FIG.

In step S1, as shown to Fig.6 (a), it is set as the state which piled up each member (preparation body), and the laminating apparatus. Specifically, the panel 18, the resin film 25a, the optical film 35, and the reinforcing member 28 are superposed in this order on the resin film 25b. Although not shown in FIG. 6 (a), each member is overlapped using a dedicated guide plate, and planar alignment is also performed. Although this step is performed under a normal environment as a suitable example, it may be performed under a reduced pressure environment described later.
Then, the preparation is set in the laminating apparatus. In FIG. 6A, only the pressure rollers 81 and 82 of the laminating apparatus are shown.

In step S2, the environment in which the laminating apparatus and the preparation body are installed is depressurized to form a depressurized environment. The laminating apparatus is installed in a chamber apparatus (room) that can set the internal environment to a desired atmospheric pressure environment. By this step, air (bubbles) inside the preparation body is removed (defoamed).
Further, in parallel, the pressure rollers 81 and 82 are heated, and the roller surface made of a heat-transferable elastomer is heated to a temperature of 80 to 120 ° C.
In step S3, as shown by the arrow in FIG. 6A, the preparation body is inserted between the pair of pressure rollers 81 and 82 from one side of the preparation body on the opposite side of the flexible substrate 20, and lamination is performed. Is called. In the portion sandwiched between the pressure rollers 81 and 82, the resin films 25a and 25b are dissolved by the heat of the rollers, and are further pressurized and bonded to each other. The dissolved resin film functions as an adhesive (filler), and the panel 18, the flexible substrate 20, the optical film 35, and the reinforcing member 28 are also bonded.
In addition, since the lamination is performed from one side to the other end of the preparation body, even if bubbles (air) remain in each member, the bubbles are pushed out to the other end side in the order of lamination. Then, as shown in FIG. 6B, the laminated illuminating device 100 is pushed out between the pressure rollers 81 and 82 to complete the lamination.

In step S4, post-processing including annealing is performed to remove residual stress in the laminated lighting device 100. The annealing process may be performed continuously in a reduced pressure environment or in a normal environment. In particular, when the resin films 25a and 25b contain a cross-linking component, it is preferable to perform an annealing treatment at about 100 ° C. to complete the cross-linking.
Note that the laminating apparatus is not limited to the roll laminating system including the pair of pressure rollers 81 and 82, and any apparatus that can laminate the prepared body to the completed state of the lighting device 100 may be used. For example, vacuum laminating by a diaphragm method (diaphragm method) in which a preparation body is set on one plate-shaped heating plate (hot plate), a deformed rubber sheet is pressed against the preparation body by a pressure difference, and heated and pressurized. An apparatus may be used.
Further, following the annealing process, attachment holes 3 (FIG. 1) are formed at the four corners of the reinforcing member 28, respectively. Specifically, four mounting holes 3 are formed by pressing in a state where the lighting device 100 is set on a dedicated guide plate. In addition, it is not limited to this method, You may form the attachment hole 3 previously in the reinforcement member 28 and resin film 25a, 25b. According to this method, since the mounting hole 3 can be used as a reference when preparing the preparation body, it is possible to improve the arrangement position accuracy of each part in the planar direction.
In this way, the lighting device 100 having both flexibility and practical strength (toughness) as shown in FIG. 1 is formed.

As described above, according to the lighting device 100 and the manufacturing method according to the present embodiment, the following effects can be obtained.
According to the illuminating device 100, the frame-shaped reinforcing member 28 made of CFRP is provided in a plane surrounding the light emitting region V on the laminate structure 25 set to a thickness that ensures flexibility. Since the tensile strength of the carbon fiber contained in the CFRP is higher than that of a conventional resin reinforcing plate, even if a bending stress is applied in the extending direction of the carbon fiber with the reinforcing member 28 attached, It is possible to suppress the glass substrate from bending to a limit point (limit radius) without impairing flexibility.
Furthermore, since the reinforcing member 28 includes a laminated structure in which two or more carbon fiber layers having different extending directions of the carbon fibers are laminated, the tensile strength from all directions is enhanced by both of them, and from which direction Even if bending stress is applied, the glass substrate can be prevented from bending to the limit point (limit radius).
This is due to the characteristic of carbon fibers that the elongation due to high tensile strength is extremely small and that the dimensional change is very small by laminating the fibers diagonally. Due to this characteristic, the reinforcing member 28 can be prevented from being deformed when bent to some extent even when stress is applied, and the glass substrate can be prevented from bending to a limit point (limit radius). Further, the reinforcing member 28 also has a function of deformation restraint and restoration that restores the original shape like a spring.

Furthermore, CFRP containing carbon fiber has a very low coefficient of linear expansion of 1 ppm / ° C. or less, so it does not generate warp even when bonded by thermocompression bonding at about 100 ° C., which is very 4 ppm / ° C. of glass. Because it is close, it is very resistant to thermal shock as a panel.
In addition, since the corners R are formed at the four corners of the opening (hole) of the reinforcing member 28, the occurrence of cracks when bending stress is applied is suppressed as compared to the case where the four corners are edges. can do. For example, the corner R is formed with a radius of about 1 mm.
Accordingly, it is possible to provide the lighting device 100 that has both flexibility and practical strength (toughness). In other words, the lighting device 100 having sufficient practical strength can be provided.

Further, unlike the conventional display device (FIG. 14) in which the reinforcing plates (91, 92) are respectively attached to the front and back surfaces of the panel, the reinforcing member 28 is placed on the surface of the laminate structure 25 as shown in FIG. Since the structure is provided, the panel 18 can be thinned. Thereby, since the shape followability of the resin film at the time of lamination improves, generation | occurrence | production of the clearance gap to the peripheral part of the panel 18 can be reduced (prevented).
In particular, according to the results of experiments by the inventors, in a preferred example in which the thickness of the panel 18 is about 90 μm and the thickness of the resin films 25 a and 25 b is set to about 50 μm, there is a gap in the peripheral edge of the panel 18. Occurrence was not observed.
Furthermore, since the reinforcing member 28 has a higher thermal conductivity than the resin and is attached in a state where one surface is in contact with the outside air on the surface of the laminate structure 25, the heat generated by the panel 18 can be efficiently radiated. it can. Therefore, deterioration due to heat generation of the panel 18 can be suppressed.
Therefore, it is possible to provide the lighting device 100 having both flexibility, practical strength (toughness), and heat dissipation.

Further, since the reflective layer 28a is formed on the surface of the reinforcing member 28, a part of the illumination light emitted from the light emitting region V is reflected by the reflective layer 28a to be light contributing to illumination. it can. In other words, since the illumination efficiency can be increased by the reflective layer 28a, it is possible to obtain sufficient illumination efficiency as the illumination device.
Therefore, the illuminating device 100 which has sufficient illumination efficiency can be provided.

In addition, unlike the conventional reinforcing structure in which the connecting portion of the flexible substrate 20 is covered and molded with silicon resin (adhesive) or the like, the reinforcing structure is also used by laminating with the resin films 25a and 25b. , Production efficiency is good. Further, since the connection portion and the panel 18 are bonded (filled) with the same resin, sufficient practical strength (toughness) can be ensured without impairing flexibility.
Furthermore, since the polyethylene-based adhesive layer used for the resin films 25a and 25b is excellent in insulation, water resistance, and heat resistance, sufficient electrical reliability can be ensured.

In addition, in the manufacturing method, the polyethylene-based adhesive layer has almost no initial tackiness at room temperature as seen in the acrylic adhesive layer, so that not only air bubbles are easily removed, but also in the state of a pre-stacked preparation. Positioning can be done easily. Therefore, since a multilayer structure can be formed by a single heat lamination in a reduced pressure atmosphere, manufacturing efficiency is good. Moreover, it is excellent in mass productivity.
Furthermore, since the polyethylene-based adhesive layer has almost no initial adhesion at room temperature, there is little sticking of foreign matter, and even if foreign matter is attached, it can be easily removed. Further, even when there is a foreign matter, when softened by heating, if the foreign matter is small, it is embedded in the adhesive layer, so that defects due to foreign matter contamination can be suppressed as compared with a commonly used acrylic adhesive layer. Moreover, since polyethylene-type resin is general purpose resin, member cost can be held down.

(Embodiment 2)
FIG. 7A is a plan view of the lighting apparatus according to the second embodiment, and corresponds to FIG. FIG. 7B is a cross-sectional view taken along the line gg in FIG. 7A and corresponds to FIG.
Hereinafter, the illuminating device 110 which concerns on Embodiment 2 of this invention is demonstrated. In addition, about the component same as Embodiment 1, the same number is attached | subjected and the overlapping description is abbreviate | omitted.
The lighting device 110 according to the present embodiment has a configuration in which a reinforcing member 30 on the back surface is added to the lighting device 100 according to the first embodiment. Moreover, the attachment hole 4 formed in the peripheral part of the illuminating device 110 has a long hole (track hole) shape. Furthermore, reflection layers 28c and 30c are formed on the inner surfaces (surfaces on the panel 18 side) of the front and back reinforcing members 28 and 30, respectively. Except for these configurations, the description is substantially the same as that described in the first embodiment.

The lighting device 110 includes a reinforcing member 30 that covers the entire back surface of the laminate structure 25 in addition to the reinforcing member 28 on the surface of the laminate structure 25. The reinforcing member 30 is made of CFRP or the like, like the reinforcing member 28.
Further, as shown in FIG. 7A, the attachment hole 4 formed in the peripheral portion has a long hole (track hole) shape. Specifically, slit-like attachment holes 4 having semicircular ends at both ends are formed along the long side of the outer shape of the illumination device 110. On the long side on the Y-axis (+) side, one mounting hole 4 is formed along the length of the substantially long side. On the long side on the Y-axis (−) side, two long and short mounting holes 4 are formed avoiding the flexible substrate 20.
In addition, it is not limited to this structure, What is necessary is just to form the some attachment hole 4 of long hole shape in the peripheral part. For example, the attachment hole 4 may be further formed along the short side, or may be formed together with a circular attachment hole.

A reflective layer 30c is formed on the entire inner surface (fifth surface) of the reinforcing member 30. The reflective layer 38 c is a reflective layer made of an aluminum film or the like similar to the reflective layer 28 a of the reinforcing member 28. As with the reflective layer 28a, a protective layer such as a resin coat layer may be provided thereon. On the other hand, the outer surface (Z-axis (+) side surface: sixth surface) of the reinforcing member 30 is exposed from a base material such as CFRP.
In the present embodiment, the reflective layer 28c is also formed on the inner surface of the reinforcing member 28 on the surface (the surface on the panel 18 side). The reflective layer 28c is a reflective layer similar to the reflective layer 28a on the front surface side. A protective layer such as a resin coat layer may be provided on the reflective layer 28c on the inner surface.
Moreover, although the optical film 35 is attached to the opening part (hole) of the reinforcement member 28 of the surface similarly to the illuminating device 100 of Embodiment 1, the planar size is a magnitude | size which can be accommodated in an opening part. The overlapping portion between the peripheral edge portion and the reinforcing member 28 is not provided. According to this configuration, since there is no overlapping portion, the illumination device 110 can be made thinner accordingly.

  The manufacturing method is basically the same as the manufacturing method described in the first embodiment. Specifically, the first embodiment is a preparation body in which the resin film 25b, the panel 18, the resin film 25a, the optical film 35, and the reinforcement member 28 are superposed in this order on the reinforcement member 30. Laminate and integrate in the same way.

In the above description, the reflective layer 28c (reflective layer 30c) has been described as having a substantially flat shape along the inner surface shape of the reinforcing member 28 (reinforcing member 30). However, the present invention is not limited to this configuration. Any shape that can efficiently reflect light may be used.
FIGS. 8A to 8C are enlarged views of a j portion in FIG. 7B, and a reflective shape having a plurality of irregularities is given to the reflective layer 28c.
For example, as shown in FIG. 8A, the peripheral portion of the inner surface of the reinforcing member 28 may be embossed by pressing or the like to give a plurality of stepped reflection shapes to the reflective layer 28c. It is preferable that the height difference of the unevenness in the step-like reflection shapes be in the range of 0.1 to 10 μm. The reflection shape may be a wave shape or a wedge shape in addition to the step shape.
Further, in order to further improve the light reflection efficiency, it is preferable to increase the height difference of the unevenness closer to the peripheral portion than to the light emitting region V side. The planar pattern may be a dense pattern, and may be, for example, a case pattern or a scale pattern.

Further, the reflective layer 30c on the inner surface of the reinforcing member 30 is also given a similar step-like reflective shape.
Further, in the embodiment of FIG. 8A, as a preferred example, the reflection layer 28a on the surface of the reinforcing member 28 is also provided with a stepped reflection shape, but the surface is as shown in FIG. 7B. It may be a flat reflecting surface.
The embossing which gives such a reflective shape is, for example, a mold having unevenness with a height difference of 0.1 to 10 μm on the surface of a precursor (prepreg) laminated with resin-containing osmotic carbon fibers at 80 to 120 ° C. Press to form while heating. Thereafter, a reflective layer such as aluminum is formed on the inner surface (surface) by vacuum deposition or the like.
At this time, if a roll-shaped mold is used, the precursor sheet can be rolled up by roll to roll, and the production efficiency can be further increased.

Further, as shown in FIG. 8B, a plurality of reflective shapes formed on the inner reflective layer 28c of the reinforcing member 28 and the inner reflective layer 30c of the reinforcing member 30 are formed as concave (bowl-shaped) dimple shapes. Also good.
Alternatively, as shown in FIG. 8C, a plurality of reflective shapes formed on the inner reflective layer 28c of the reinforcing member 28 and the inner reflective layer 30c of the reinforcing member 30 may be convex (conical). .
In FIGS. 8B and 8C, the reflective layer 28a on the surface of the reinforcing member 28 has a flat reflective shape. However, the present invention is not limited to this, and the concave reflective shape or the convex reflective shape is used. May be given.

Fig.9 (a) is an enlarged view of the k section in FIG.7 (b).
Moreover, the structure which further comprises the reflection member 33 in the peripheral part of the illuminating device 110 may be sufficient.
The reflecting member 33 is a sealing member made of a metal such as aluminum, and has a cross-sectional shape that is a concave shape as shown in FIG. 9A. Then, in a state where the concave bottom surface 33 a is pressed against the end surface of the lighting device 110, the end portion of the lighting device 110 is sandwiched between the two convex portions in the concave shape. Further, in plan view, the illumination device 110 is formed so as to cover four sides. The portion through which the flexible substrate 20 passes has a cutout shape.
The bottom surface 33a is a reflective surface, and reflects light emitted from the end surface of the panel 18 and reflects it toward the panel 18 side. The reflected light is repeatedly reflected by the reflective layer 28c, the reflective layer 30c, and the like, and a part of the light becomes illumination light.
In addition, it is not limited to metal, What is necessary is just the structure which a reflective surface contact | abuts to the end surface of the illuminating device 110. FIG. For example, the structure which covers (sticks) the end surface of the illuminating device 110 with the tape member which has reflectivity may be sufficient.

FIG. 9B is an enlarged view of a j portion in FIG.
Alternatively, the reinforcing member 28 and the reinforcing member 30 may be in close contact with each other at the periphery. Specifically, after laminating both in step S3 of FIG. 5, the peripheral edge is brought into close contact by setting in a dedicated mold and pressing. The mold has a shape for narrowing the peripheral edge and is heated to a temperature of 80 to 120 ° C.
By this press working, as shown in FIG. 9B, the end portions of the reinforcing member 28 and the reinforcing member 30 are narrowed down, and the reflective layer 28c and the reflective layer 30c are in close contact with each other at the peripheral portion. At this time, a part of the resin film constituting the laminate structure 25 protrudes to the outside to form a resin reservoir 25d.
And after making the reinforcement member 28 and the reinforcement member 30 contact | adhere in a peripheral part, the post-processing process in FIG.5 S4 is performed. In the post-processing step, the resin reservoir 25d may be removed.

As described above, according to the present embodiment, in addition to the effects in the first embodiment, the following effects can be obtained.
According to the illuminating device 110, in addition to the frame-shaped reinforcing member 28 on the front surface, the reinforcing member 30 covering the entire back surface is provided.
Therefore, even if bending stress is applied from any direction, the glass substrate can be prevented from bending to the limit point (limit radius). In particular, since the two reinforcing members wrap the peripheral edge of the panel 18 that is most likely to crack from the front and back surfaces, the panel 18 can be more reliably prevented from cracking.
Therefore, the lighting device 110 having both flexibility and practical strength (toughness) can be provided.

Further, the heat generated by the panel 18 can be radiated more efficiently by the two reinforcing members on the front and back surfaces.
Therefore, it is possible to provide the lighting device 110 having both flexibility, practical strength (toughness), and heat dissipation.

Further, since the reflective layer 28 c is formed on the inner surface of the reinforcing member 28 and the reflective layer 30 c is formed on the inner surface of the reinforcing member 30, light emitted from a portion other than the light emitting region V of the panel 18 ( A part of (light leakage) can also be used as illumination light. Specifically, for example, a part of the light leaked from the end face of the panel 18 is repeatedly emitted from the light emitting region V while being reflected by the reflective layer 28c and the reflective layer 30c. Part.
Therefore, since illumination efficiency can be improved, sufficient illumination efficiency can be obtained as an illumination device.
Therefore, the illumination device 110 having sufficient illumination efficiency can be provided.

In addition, the reflection efficiency can be increased by providing a plurality of wedge shapes, convex shapes, concave shapes, or the like to the reflective layer 28c and the reflective layer 30c on the inner surface of each reinforcing member. In other words, the amount of light leakage toward the light emitting region V can be increased.
Moreover, the light leakage in the panel 18 comprised from a pair of transparent substrate has the largest ratio radiate | emitted from the end surface.
By providing the reflecting member 33 at the peripheral edge of the illumination device 110 or by narrowing the peripheral edge to bring the reflective layer 28c and the reflective layer 30c into close contact with each other, the amount of light leaking to the outside can be reduced. In other words, it is possible to increase the utilization efficiency of the leaked light emitted from the end face and increase the illumination efficiency.
Therefore, the illumination device 110 having sufficient illumination efficiency can be provided.

(Embodiment 3)
Fig.10 (a) is a top view of the illuminating device which concerns on Embodiment 3, (b) is a sectional side view of the mm cross section in Fig.10 (a).
Hereinafter, the illuminating device 120 which concerns on Embodiment 3 of this invention is demonstrated. In addition, about the same component as each said embodiment, the same number is attached | subjected and the overlapping description is abbreviate | omitted.
The illuminating device 120 of the present embodiment is a large-sized (large area) illuminating device in which a plurality of panels are integrated in a state (tiling) arranged in a plane. Specifically, the four panels 32 are laminated with resin films 45a and 45b and reinforcing members 36 and 37 from the front and rear surfaces in a state where they are arranged in a plane.

The lighting device 120 is a lighting device in which four panels 32 are tiled in a matrix. The panel 32 is the same as the panel 18 of the first embodiment except that it has a long rectangle in the Y-axis direction, and emits substantially white light from the light emitting region.
The four panels 32 are laminated with resin films 45a and 45b from the front and back surfaces to form an integral laminate structure 45 in a state where the longitudinal directions are aligned and arranged at equal intervals in the vertical and horizontal directions. The resin films 45a and 45b have the same configuration as the resin films 25a and 25b of the second embodiment except for the planar shape (size).
Further, reinforcing members 36 and 37 are laminated together on the front and back surfaces of the laminate structure 45 so as to be integrated. The reinforcing members 36 and 37 have substantially the same configuration as the reinforcing members 28 and 30 except for the planar shape (size). Specifically, the reinforcing member 36 includes a plurality of openings for exposing the light emitting regions of the panels 32. Further, the reinforcing member 37 covers all the back surfaces of the four tiled panels 32.

Moreover, as shown to Fig.10 (a), the elongate attachment hole 4 is formed in the peripheral part of the illuminating device 120. As shown in FIG. Specifically, slit-like mounting holes 4 having both ends semicircular are formed along the long side of the outer shape of the illumination device 120. Also, slit-like mounting holes 4 are formed on the short side on the Y-axis (+) side.
In addition, it is not limited to this structure, What is necessary is just to form the some attachment hole 4 of long hole shape in the peripheral part. For example, the attachment hole 4 may be formed also on the short side on the Y-axis (−) side, or may be formed together with a circular attachment hole.

In addition, the four flexible boards 20 that supply driving power to the four panels 32 are taken out from the short side of the lighting device 120 on the Y-axis (−) side. In particular, the flexible substrate 20 of the panel 32 positioned on the Y-axis (+) side is taken out from the short side on the Y-axis (−) side through the back surface of the panel 32 on the Y-axis (−) side. .
Further, the rectangular light emitting area of each panel 32 is partitioned into two substantially square light emitting areas Va and Vb by ribs 36 g of the reinforcing member 36. The ribs 36g prevent the light emitting region from extending and spreading in the X-axis direction during lamination.
Note that the number of panels 32 to be tiled is not limited to four, and may be any number as long as it is a plurality.

As described above, according to the present embodiment, in addition to the effects in the second embodiment, the following effects can be obtained.
According to the lighting device 120, it is possible to configure a lighting device having a desired plane size by tiling a plurality of panels.
In particular, when the panel is thinned, it is easy to break, so there is a limit to increasing the size in terms of handleability and yield. Therefore, by tiling a plurality of panels having a size that can ensure handling and yield, a large-area lighting device can be configured with good yield.
Therefore, the large illuminating device 120 can be provided with low manufacturing efficiency and low cost.

(Lighting device)
FIG. 11 is an aspect diagram in which the above-described lighting device is used as an airplane interior lighting device.
The lighting device 110 described above can be used, for example, in an indoor lighting device for an airplane as a lighting device (electronic device). In addition, you may replace the illuminating device 110 with the illuminating device in each embodiment and a modification.

As shown in FIG. 11, the illumination device 110 is attached in a curved state to a wall surface 50 of a plane having a curved surface. Specifically, the lighting device 110 is attached to the wall surface 50 on the window 53 side in the passenger seat 52. In the wall surface 50, a window 53 is formed in a region near a relatively flat surface next to the seat 52, and the lighting device 110 is disposed in a portion where the degree of curvature of the upper portion of the window 53 is large. In other words, when the passenger sits on the seat 52, the passenger is placed at a position where the light can be illuminated mainly.
Moreover, it is not limited to attaching the illuminating device 110 directly to the wall surface 50, For example, you may attach to the cover of the container formed in the upper part of the window 53, or you may attach to the ceiling which has a curved surface. good.

Thus, when the illumination device 110 is used as an airplane interior illumination device, it can be attached to a curved surface by taking advantage of its flexibility. Moreover, since it is lightweight, even if it is attached to the lid of the container, the opening / closing performance is not impaired, and the fuel consumption of the airplane can be further suppressed. In addition, since the luminance changes substantially linearly according to the amount of DC power to be supplied, it is possible to perform dimming without requiring a complicated circuit such as an inverter circuit.
Therefore, it is possible to provide a lighting device that is lightweight, easy to use regardless of installation location.

Further, the present invention is not limited to an airplane interior illumination device, and may be used for interior illumination in a moving means such as a ship, a train, or an automobile. Alternatively, it may be used for indoor lighting in a building such as a company, an inn, or a house.
Even when the lighting device 110 is used for these applications, the same effects can be obtained.

  Note that the present invention is not limited to the above-described embodiment, and various modifications and improvements can be added to the above-described embodiment. A modification will be described below.

(Modification 1)
This will be described with reference to FIG.
FIG. 12A is a cross-sectional view of a display device according to Modification Example 1, and corresponds to FIG. 12B and 12C are perspective views illustrating one aspect of the reinforcing member according to the first modification.
Hereinafter, the illuminating device 130 which concerns on the modification 1 of this invention is demonstrated. In addition, about the component same as Embodiment 2, the same number is attached | subjected and the overlapping description is abbreviate | omitted.
The lighting device 130 according to the present embodiment includes a reinforcing member 40 having a different configuration from the reinforcing member 30 according to the second embodiment. Specifically, the reinforcing member 40 is provided with a heat radiation characteristic improved compared to the reinforcing member 30. Other than that, it is substantially the same as the description in the second embodiment.

A reinforcing member 40 is attached to the entire back surface of the laminate structure 25 in the lighting device 130. In addition, the size of the planar reinforcing member 40 is substantially the same as that of the laminate structure 25.
As shown in FIG. 12B, the reinforcing member 40 is formed by laminating a graphite layer 31 and a reflective layer 30c on a reinforcing body 30 made of CFRP having a four-layer structure. The reinforcing body 30 has the same configuration as that of the reinforcing member 30 in the second embodiment. However, in the present embodiment, the reinforcing body 30 is a constituent part of the reinforcing member 40, and hence is referred to as the reinforcing body 30. In order to make the configuration easy to understand, the reflective layer 30c is omitted in FIGS. 12 (b) and 12 (c).

The graphite (graphite) layer 31 has a planar hexagonal structure layer composed of carbon atoms in the thickness direction (Z-axis direction) as shown in the enlarged view (circled portion) at the top of FIG. It has a stacked configuration.
Since the graphite layer 31 has an excellent thermal conductivity of 600 to 1500 W / m · k in the plane direction, disposing the layer between the laminate structure 25 and the reinforcing body 30 improves heat dissipation. be able to. Specifically, the heat generated by the panel 18 is dispersed in the entire graphite layer 31 in a short time and is transferred to the outermost reinforcing body 30, so that the heat dissipation can be improved. The method for producing the graphite layer may be a synthetic graphite crystallized by firing at a temperature of 1000 ° C. or more using a polyimide film as a starting material, or natural graphite obtained by rolling graphite particles produced in a mine or the like to form a film. Since both have a hexagonal crystal structure, a thermal conductivity of 600 W / m · k or more can be obtained. Moreover, the linear expansion coefficient of the graphite layer 31 is about 5 ppm / ° C., which is substantially the same as that of the glass substrate.

Moreover, the laminated body which laminated | stacked the reinforcement body 30 and the graphite layer 31 which consist of CFRP is also called CFGRP (Carbon fiber graphite reinforced plastics). In this modification, an aluminum foil having excellent thermal conductivity is used as the reflective layer 30c.
The reinforcing member 40 (CFGRP) is formed by, for example, superimposing a prepreg film (layer) impregnated with carbon fiber with an epoxy intermediate, a graphite film (layer), and the reflective layer 30c, and performing hot press processing in a reduced pressure atmosphere. Can be formed. In addition, it is preferable that heating temperature is the temperature within the range of 120-150 degreeC.
Further, in the present embodiment, CFRP having a four-layer configuration is adopted as a preferred example, but it is only necessary to include a laminated structure in which two or more carbon fiber layers having different extending directions of carbon fibers are included. This is the same as described in FIG.

Here, the size of the planar graphite layer 31 is smaller than that of the reinforcing body 30. In other words, the periphery of the graphite layer 31 is sized to fit within the reinforcing body 30. Preferably, the size of the graphite layer 31 is larger than the light emitting region V of the panel 18 and smaller than the outer size of the panel 18.
This is to make use of the excellent thermal conductivity of the graphite layer 31 and to make up for the wear resistance and brittleness of the layer. It is a device to prevent the hang.

In the present embodiment, as a suitable example, CFGRP having a five-layer structure and a thickness of about 140 μm is used for the reinforcing body 30. Specifically, CFGRP in which a CFRP having a four-layer structure and a thickness of about 100 μm and a graphite layer 31 having a thickness of about 40 μm are stacked is used.
The thickness is not limited to this, and the thickness of the reinforcing body 30 may be any thickness within the range of about 50 to 200 μm. If it is this thickness, the independence and intensity | strength of the illuminating device 130, and moderate flexibility can be ensured.
Further, the thickness of the graphite layer 31 is preferably 50 μm or less so as not to impair the thermal conductivity in the thickness direction.

Further, the configuration of the reinforcing member 40 is not limited to the above-described embodiment of FIG. For example, the configuration shown in FIG.
In the reinforcing member 40 of FIG. 12C, an opening (hole) for fitting the graphite layer 31 is formed in the uppermost carbon fiber layer i in the reinforcing body 30. In other words, the uppermost carbon fiber layer i is formed in a frame shape having an opening in which the graphite layer 31 is accommodated.
That is, the reinforcing member 40 has a configuration in which the graphite layer 31 is fitted in the opening. Moreover, the hot press process mentioned above can be used for a manufacturing method.
In the case of this configuration, in order to ensure heat transfer, the thickness of the graphite layer 31 is such that the upper surface of the graphite layer 31 is the same height as the upper surface of the carbon fiber layer i or protrudes from the upper surface of the carbon fiber layer i. Set. As a suitable example, for example, the thickness of the graphite layer 31 is set to about 25 μm, which is the same as the carbon fiber layer i.
According to this configuration, it is possible to reduce the total thickness of the lighting device 130 while providing substantially the same effects such as heat dissipation as compared with the case where the reinforcing member of FIG.

As described above, according to the present modification, in addition to the effects in the second embodiment, the following effects can be obtained.
According to the lighting device 130, the reinforcing member 40 in which the reinforcing body 30 made of CFRP, the graphite layer 31, and the reflective layer 30 c are laminated and integrated is attached to the back surface of the laminate structure 25.
In particular, since the reflective layer 30c and the graphite layer 31 having excellent thermal conductivity are arranged between the laminate structure 25 and the reinforcing body 30, the heat generated by the panel 18 can be generated in a short time. Can be dispersed radially and heat can be transferred to the outermost reinforcing body 30. Then, heat can be radiated from the outermost reinforcing body 30 into the outside air.
Furthermore, since the linear expansion coefficient of the graphite layer 31 is about 5 ppm / ° C. and is substantially equivalent to a glass substrate, even if the reinforcing member 40 laminated with the reinforcing body 30 made of CFRP is attached to the laminate structure 25, It does not cause warpage.
Therefore, it is possible to provide the lighting device 130 having sufficient heat dissipation and preventing warpage.

In addition, the thickness of the graphite layer 31 is set to be as thin as 50 μm or less, and the structure is wrapped with the reinforcing body 30 and the resin film 25b so that the peripheral portion is not exposed, so that the thermal conductivity in the thickness direction is not impaired, The wear resistance and brittleness of the layer can be compensated and sufficient practical strength can be ensured.
Therefore, according to the lighting device 130, sufficient practical strength can be obtained while having flexibility.

(Modification 2)
FIG. 13 is a cross-sectional view of a lighting device according to Modification 2, and corresponds to FIG.
Hereinafter, the illuminating device 140 which concerns on the modification 2 of this invention is demonstrated. In addition, about the component same as Embodiment 2, the same number is attached | subjected and the overlapping description is abbreviate | omitted.
In each of the embodiments described above, the panel 18 that emits illumination light from the light emitting region on the front surface has been described. However, a configuration that uses a panel that emits illumination light from both the front and back surfaces may be used.

The illumination device 140 includes a panel 58 that emits illumination light from both the front and back surfaces. Further, in addition to the reinforcing member 28 on the front surface, the same frame-shaped reinforcing member 28 is provided on the back surface.
The configuration of the panel 58 is substantially the same as that of the panel 18 described with reference to FIG. 3, but the thickness of the metal layer forming the cathode electrode 9 is thin enough to transmit light. Alternatively, the cathode electrode 9 may be formed of a transparent electrode such as ITO.
With this configuration, the panel 58 emits illumination light from a region corresponding to the light emitting region on the back surface in addition to the light emitting region on the front surface. In other words, the panel 58 emits substantially white illumination light from both the front and back surfaces.
For this reason, in the illuminating device 140, in order to emit the illumination light from the back surface of the panel 58 to the outside, the same frame-shaped reinforcing member 28 as the front surface is inverted and used on the back surface. In addition, the optical film 35 is attached to the light emitting area on the back surface as well as the front surface.

According to the illuminating device 140, since illumination light can be emitted from both the front and back surfaces, for example, it can be suitably used for a partition that partitions two customer service corners. In this case, both customer service corners can be illuminated simultaneously. Or it can use suitably also for the glass door which faces the road surface of a store. In this case, it is possible to simultaneously illuminate the road surface and the feet in the store at night.
Therefore, the illuminating device 140 suitable for the use which illuminates both front and back surfaces simultaneously can be provided.

(Modification 3)
This will be described with reference to FIG.
In each of the above embodiments, the CFRP containing carbon fiber is used as the reinforcing member 28 and the reinforcing member 30 (reinforcing body). However, the present invention is not limited to this, and any material having similar physical properties may be used. good.
For example, the reinforcing member 28 may be configured using invar (an iron alloy having a Ni content of 30 to 50%), titanium, a titanium alloy, or the like having low thermal deformability (low linear expansion coefficient) close to CFRP. good.
Further, for example, in the configuration shown in FIG. 7B, the frame-shaped reinforcing member 28 is made of invar having excellent workability, and the plate-like reinforcing member 30 is made of CFRP. May be used.
Even if it is these structures, the effect similar to said each embodiment can be acquired.

(Modification 4)
This will be described with reference to FIG.
In each of the embodiments described above, the panels 18 and 32 are described as passive panels that emit substantially white light from the light emitting region V. However, the present invention is not limited to this. For example, the panels 18 and 32 are active panels. Also good. Specifically, an organic EL panel having a light emitting region V in which RGB active pixels are formed in a matrix may be used.
Even if it is these structures, the effect similar to said each embodiment can be acquired. Furthermore, it is possible to provide an illumination device that can obtain an illumination color having a desired color tone. The lighting device can also be used as a display panel such as a signboard or a signboard.

  DESCRIPTION OF SYMBOLS 1 ... Element board | substrate, 8 ... Organic electroluminescent layer as an electro-optic layer, 16 ... Sealing board | substrate, 18 ... Panel, 20 ... Flexible board | substrate, 25a, 25b ... Resin film, 28 ... Reinforcement member as 1st reinforcement member, 28a , 28c, 30c ... reflective layer, 30 ... reinforcing member as second reinforcing member, 100, 110, 120 ... illuminating device as electro-optical device, h ... carbon fiber layer as first carbon fiber layer, i ... second Carbon fiber layer as a carbon fiber layer, V...

Claims (14)

A panel having an electro-optic layer;
A resin film that is laminated so as to cover the first surface on the light emitting region side of the panel and the second surface opposite to the first surface;
A reinforcing member provided on the resin film covering the first surface,
The reinforcing member has an opening in the light emitting region of the panel, a third surface facing the first surface of the panel, and a fourth surface facing the third surface,
A lighting device, wherein a reflective layer is formed on at least one of the third surface and the fourth surface of the reinforcing member.   The lighting device according to claim 1, wherein a reflective layer is formed on the third surface and the fourth surface of the reinforcing member. When the reinforcing member is a first reinforcing member,
The lighting device according to claim 1, further comprising a second reinforcing member provided on the resin film that covers the second surface of the panel. The second reinforcing member has a fifth surface facing the second surface of the panel, and a sixth surface facing the fifth surface,
The lighting device according to claim 3, wherein a reflective layer is formed on the fifth surface of the reinforcing member.   The reinforcing member includes a first carbon fiber layer including a plurality of carbon fibers extending in a first direction in a plane and a plurality of carbon fibers extending in a second direction intersecting the first direction. The lighting device according to any one of claims 1 to 4, comprising a laminated structure including a second carbon fiber layer. The first carbon fiber layer and the second carbon fiber layer are formed of a prepreg obtained by impregnating carbon fiber with a resin,
The lighting device according to claim 5, wherein the reinforcing member is a laminated body in which three or more layers of the first carbon fiber layer and the second carbon fiber layer are laminated and cured.   The lighting device according to claim 1, wherein the reinforcing member is made of invar, titanium, or a titanium alloy. The opening shape of the reinforcing member is provided in the same shape as the light emitting region,
The lighting device according to any one of claims 1 to 7, wherein the reinforcing member has a size that covers the end of the panel in a planar manner. In the peripheral edge of the panel,
The lighting device according to claim 1, wherein a plurality of mounting holes penetrating the resin film and the reinforcing member are formed.   The lighting device according to claim 9, wherein the mounting hole is formed in a long hole shape along a side of the panel. The panel comprises the electro-optic layer sandwiched between a pair of glass substrates,
The thickness of the said glass substrate is 100 micrometers or less, respectively, The illuminating device as described in any one of Claims 1-10 characterized by the above-mentioned.   The lighting device according to claim 1, wherein the resin film is a polyethylene copolymer material.   The illumination device according to claim 1, wherein the electro-optical layer is an organic EL layer including an organic light emitting layer. A panel having an electro-optic layer;
A resin film that is laminated so as to cover the first surface on the light emitting region side of the panel and the second surface opposite to the first surface;
A reinforcing member provided on the resin film covering the first surface,
The reinforcing member has an opening in the light emitting region of the panel, a third surface facing the first surface of the panel, and a fourth surface facing the third surface,
An electro-optical device, wherein a reflection layer is formed on at least one of the third surface and the fourth surface of the reinforcing member.

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