JP2013015794A - Banner combining organic electroluminescent devices - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a banner using organic electroluminescent devices that relates to a banner to be installed in an express highway, a service area and the like.SOLUTION: An organic electroluminescent device 16 that can light independently serves as a unit display part. The unit display part can independently display a character, symbol, and figure 17 to be displayed, by lighting independently. The area of the unit display part is preferably 500 cmor more, and more preferably 1000 cmor more. The light emission area in each unit display part is preferably 30% or more, and more preferably 50% or more. With each area in the range described above, the display is sufficiently visible even from a distant position, and various patterns of display are available by lighting the unit display parts independently.

Description

  The present invention relates to a banner installed on a highway, a service area, or the like, and relates to a banner using an organic electroluminescence device.

  Banners are sometimes installed on bridges and pedestrian bridges as a means of widely disseminating information about traffic. Banners can be made more easily than signboards, etc. and are significantly lighter than signboards, making them easy to carry and install, and temporary information notifications such as construction and closure guidance and traffic manners awareness Is often used.

On the other hand, with the recent development of electroluminescence technology such as LED (light emitting diode) and organic EL (organic light emitting diode = OLED), the use for these road traffic facilities is greatly expected. In particular, since LEDs are excellent in characteristics such as high efficiency and long life, their use as road signs such as traffic lights, road shoulders and tunnel warnings is accelerating.
The organic EL is also expected to be used as a road sign by taking advantage of the fact that it is a thin surface light emission with respect to the LED which is a point light source and is as efficient as the LED (Patent Document 1, Patent Document) 2)

JP 2001-272937 A JP 2004-270443 A

The banners currently used on expressways are extremely low in visibility from the driver under poor visibility such as at night. By installing a lighting device to illuminate the banner in order to enhance visibility, the visibility problem can be solved. However, when illuminating a banner using such illumination, only a part of the displayed information is illuminated, and when illuminating all, extensive and light-intensive illumination is required, There was also an energy problem. A technique for improving visibility without impairing the freedom of installation of a banner using a thin and flexible material has not been studied.
Furthermore, banners installed on expressways are exposed to sunlight and wind and rain, causing collisions with birds, stepping stones, and so on. Is required for road traffic.
This invention makes the said content a subject, and makes it a subject to provide the banner which is excellent in visibility.

  As a result of diligent research in view of the above problems, the present inventor has demonstrated that a banner using an organic electroluminescence device (hereinafter also referred to as organic EL) is easy to transport and install and has excellent visibility at night. As a result, the present invention was completed.

That is, the present invention is as follows.
(1) A banner characterized in that an organic electroluminescence device, a protective film, a sealing layer and a scattering protective film are laminated on the display surface.
(2) The banner according to (1), wherein the organic electroluminescence device is a white light emitting type and includes a light emitting layer in which red, green, and blue light emitting materials are dispersedly doped in one layer.
(3) The banner according to (1) or (2), wherein the organic electroluminescence device is a white light emitting type and has a color temperature of 4000 K or less.
(4) The organic electroluminescence device constitutes a unit display portion on a banner display surface, and the area of the unit display portion is 500 cm ² or more, and the light emission area is 30%.
The banner according to any one of (1) to (3).
(5) The banner according to any one of (1) to (4), wherein a reinforcing layer is laminated and / or a sealing material of the organic electroluminescence device is combined with a reinforcing material.
(6) Any of (1) to (5), wherein the outer surface of the scattering protective film has an uneven structure, and the height of the uneven structure is 0.2 to 100 μm and the period is 20 mm or less. The banner described in.
(7) The banner according to any one of (1) to (6), wherein the scattering protective film is made of ETFE.
(8) The banner according to any one of (1) to (7), wherein the luminance is 200 cd / m ^{2 to} 3000 cd / m ² .
(9) The banner according to any one of (1) to (8), including an air vent mechanism.
(10) The banner according to any one of (1) to (9), comprising a solar cell and a power storage device.
(11) The banner according to (10), wherein the solar cell is of a film or sheet substrate type.

  It is possible to provide a banner that exhibits excellent visibility even under poor visibility such as at night, and that is easy to transport and install.

Cross-sectional schematic diagram of banner display surface on which organic EL, protective film, sealing layer and scattering protective film are laminated Cross-sectional schematic diagram of a typical organic current light-emitting device Schematic illustration of banner surface including organic EL and solar cells

  Although the form for implementing this invention is demonstrated in detail below, unless it exceeds the meaning of this invention, it is not limited to these contents.

  The present invention relates to a banner installed on a highway, a service area, etc., but means that it includes not only a “banner” installed in the horizontal direction but also a “hanging banner” installed in the vertical direction. .

  The banner of the present invention is characterized in that an organic EL, a protective film, a sealing layer and a scattering protective film are laminated on the display surface. Referring to FIG. 1 (a schematic cross-sectional view of a banner display surface of the present invention), 1 is a banner substrate display surface, 2 is an organic EL, 3 is a protective film, 4 is a sealing layer, and 5 is a scattering protective film. Represents. The order of stacking these layers is not particularly limited as long as each layer can exhibit its function. Further, other layers or materials may be incorporated between these layers or outside. For example, those in which a reinforcing layer or the like is incorporated between the organic EL and the protective film can be mentioned. Also, the dimensions of each layer and the structure of the end are not particularly limited. For example, the dimensions of the sealing layer are larger than those of the organic EL, and the surplus part of the sealing layer is directly bonded to the banner base material, It may be sealed.

1. Organic electroluminescent device An organic electroluminescent device (organic EL) is an organic light-emitting material that uses an organic light-emitting material to generate excitons by passing an electric current through the organic light-emitting material layer. A light-emitting device including an organic current light-emitting element that emits (which may be either fluorescent or phosphorescent) is used. In the present application, the light-emitting device is particularly sealed with a sealing film or the like. In the present invention, since it is used in the vicinity of a road, it is dangerous if fragments such as thick glass are scattered, and it is assumed that a thin and flexible sheet material or film material is used as the sealing material.

  The present invention is a banner using an organic EL as a light source, and is characterized by exhibiting excellent visibility under a poor visibility situation such as at night. In addition, since the organic EL has low power consumption, it can be combined with a solar cell to be an independent power source, and is thinner, lighter, and does not impair the characteristics of the banner that is easy to transport and install.

  The method of using the organic EL as a light source is not particularly limited. In addition to a display method that makes use of the characteristics of a thin or flexible planar light source, for example, as a backlight for a banner and makes characters, symbols, and figures appear through a filter. The display function may be achieved by forming characters, symbols, and figures using organic EL.

The number and form of the organic ELs installed on the banner display surface are not particularly limited, but it is preferable that a plurality of organic ELs are installed on the surface of one banner so that each organic EL can be lit independently. If it demonstrates with reference to FIG. 3, 16 is organic EL which can be lighted independently, and this is also called a unit display part below. By lighting the unit display section independently, the displayed characters, symbols, and figures (17 in FIG. 3) can be displayed individually. Area of the unit display unit is preferably 500 cm ² or more, 1000 cm ² or more is more preferable. Further, the light emitting area in each unit display portion is preferably 30% or more, and more preferably 50% or more. If it is in the above range, it can be sufficiently visually recognized even from a distant position, and a variety of displays can be performed by lighting each unit display unit independently.

  The emission color of the organic EL is not particularly limited, and may be a single color or a plurality of colors, and can be arbitrarily selected depending on the design of the banner. It is preferable to use a white light emitting material since various light emission expressions are possible and visibility can be further improved.

  In the case of white light emission, the color temperature is preferably 4000K or less, and more preferably 3000K or less. 2000K or less is particularly preferable. Within the above range, it is possible to ensure good visibility without placing a burden on the eyes of the driver.

Banners of the luminance of the present invention, 200 cd / m ² or more, preferably 3000 cd / m ² or less, 300 cd / m ² or more, and more preferably at most 2000 cd / m ^2. 400 cd / m ² or more,
1000 cd / m ² or less is particularly preferable. If it is in the above range, it is possible to obtain brightness that is not too dazzling for the driver even when the light source is directly visually recognized, and can be visually recognized even in a situation where visibility is poor such as at night. Moreover, the lifetime of the luminescent label itself can be extended by appropriately suppressing the luminance.

1-1. Organic Current Light-Emitting Element The structure of the organic current light-emitting element used in the present invention is not particularly limited, but a general structure will be described with reference to FIG.
FIG. 2 is a schematic cross-sectional view showing an example of the structure of an organic current light-emitting device, in which 6 is a substrate, 7 is an anode, 8 is a hole injection layer, 9 is a hole transport layer, 10 is a light emitting layer, and 11 is a hole. Blocking layer, 12 represents an electron transport layer, 13 represents an electron injection layer, and 14 represents a cathode. Even if it does not include an injection layer, a transport layer, or the like, a layer having other functions may be included, and each constituent layer may be a single layer or a plurality of layers.

  Further, the method for forming the constituent layers is not particularly limited, for example, a dry film forming method such as a vacuum deposition method or a sputtering method, or a spin coating method, a dip coating method, a die coating method, a bar coating method, a blade coating method, Examples of the wet coating method include a roll coating method, a spray coating method, a capillary coating method, an ink jet method, a screen printing method, a gravure printing method, and a flexographic printing method.

<Board>
The substrate material of the organic current light emitting device is not particularly limited, but glass plate such as quartz glass, alkali-free glass and soda lime glass, metal plate / metal foil such as aluminum and steel, polyethylene terephthalate, polyolefin, polymethacrylate, polyethylene Examples thereof include plastic films and sheets such as naphthalate, polyimide, polycarbonate, and polyether sulfone. In particular, from the viewpoint of safety against collisions with birds, stepping stones, vehicles, etc. (debris will not scatter), light weight, resistance to cracking, and easy wiring and mounting, aluminum and steel metal sheets, metal foil, plastic films, etc. In the case of a sheet or glass, it is preferable to use a thin and flexible substrate.

<Anode>
The anode material of the organic current light emitting device is not particularly limited, but is a metal such as aluminum, gold, silver, nickel, palladium, platinum, metal oxide such as oxide of indium and / or tin, or halogenated such as copper iodide. Examples thereof include metals, carbon black, and conductive polymers such as poly (3-methylthiophene), polypyrrole, and polyaniline. When the substrate is a conductive material, the substrate and the anode may be the same.

<Cathode>
The cathode material of the organic current light emitting device is not particularly limited, and examples thereof include metals such as tin, magnesium, indium, calcium, aluminum, and silver, or alloys thereof. Moreover, in order to suppress the reflection of the light from the outside which arises at the time of light extinction of organic EL, a cathode can also be made into a rough surface.

<Light emitting layer>
In addition to the light emitting material, the light emitting layer of the organic current light emitting element may contain a compound having a hole transporting property (hole transporting compound) or a compound having an electron transporting property (electron transporting compound). preferable. For example, a material using a light-emitting material as a dopant material and a hole transporting compound, an electron transporting compound, or the like, or a mixture thereof as a host material can be given.

  The light emitting material of the light emitting layer is not particularly limited, and may be a fluorescent light emitting material or a phosphorescent light emitting material. From the viewpoint of internal quantum efficiency, a phosphorescent material is preferred. In addition, although a fluorescent light emitting material and a phosphorescent light emitting material may be used in combination, the light emission efficiency as an element is greatly affected by the efficiency of the fluorescent light emitting material. All are preferably phosphorescent materials. The ratio of the light emitting material in the light emitting layer is not particularly limited, but is usually 0.05% by weight or more and usually 35% by weight or less.

  The molecular weight of the light emitting material is not particularly limited, but is usually 10,000 or less, preferably 5000 or less, more preferably 4000 or less, still more preferably 3000 or less, and usually 100 or more, preferably 200 or more, more preferably 300 or more, and further. Preferably it is the range of 400 or more.

The thickness of the light emitting layer is not particularly limited, but is usually 3 nm or more, preferably 5 nm or more, most preferably 10 nm or more, and usually 200 nm or less, preferably 100 nm or less, and most preferably 70 nm or less.

  In the case of using a white light emitting organic current light emitting device, the configuration is not particularly limited, but an RGB stacked type in which light emitting materials such as red (R), green (G), and blue (B) are doped and stacked on individual layers. In addition, there are an RGB dopant type in which a plurality of light emitting materials coexist in one layer, and an RGB block pixel type in which each color is arranged in a planar block shape. When a plurality of layers are formed as in the RGB stacked type, the optical interfaces are formed because the refractive indexes are different in each layer, and the light interferes with each other because the thickness of each layer is close to the wavelength of visible light. A phenomenon occurs in which the color changes depending on the angle. In the case of the RGB dopant dispersion type in which a plurality of light emitting materials coexist in one layer, an optical interface is not formed in the light emitting layer, and color change due to a viewing angle hardly occurs, which is particularly preferable. The RGB block pixel type also hardly changes in color depending on the viewing angle. However, it is necessary to form a block at the time of manufacturing, and there is a problem in that the manufacturing process becomes complicated and expensive.

  The dispersion method and the layer preparation method in the case of the RGB dopant dispersion type are not particularly limited, and examples thereof include a method in which each light emitting material is mixed with a host material and adjusted to the above-described wet film formation method. The RGB dopant dispersion type is a process suitable for an inexpensive and highly efficient normal pressure coating process. Further, the dispersion amount or dispersion ratio of each light emitting material is not particularly limited, and can be set as appropriate according to the target light emission color.

<Other constituent layers>
In addition to the above-described constituent layers, the materials, forms, and adjustment methods of the hole injection layer, hole blocking layer, electron injection layer, protective layer, etc. are not particularly limited. Moreover, you may have a structure other than this, The material, a form, and the adjustment method can use suitably what is used as an organic current light emitting element.

1-2. Sealing Material In the present invention, the organic EL means a state in which the above-described organic current light emitting element is sealed.
The method for sealing the organic current light emitting element is not particularly limited as long as it can be sealed so as to cover the display and the light emitting region, and a method of bonding an electrode, a substrate, a sealing material, etc. with an adhesive, a thermoplastic resin And a method of sealing by a wet laminating method, a dry laminating method, a hot melt laminating method, an extrusion laminating method, a thermal laminating method or the like. Since the luminescent material may be deteriorated by heat treatment, a method capable of sealing at a temperature of 110 ° C. or lower is preferable.

  The kind of sealing material is not specifically limited, A glass plate, a polymer plate, a film, etc. are mentioned. From the viewpoint of easy transportation and installation, it is preferable that the banner is made of a thin and flexible material, and the sealing material is also flexible, and a polymer material or polymer material in which fragments are not scattered even if broken. A thin-walled glass sheet reinforced with the above is preferable.

  Moreover, in order to suppress deterioration due to ultraviolet rays or heat, an ultraviolet absorber, an antioxidant, a light stabilizer, or the like may be added to the sealing material. The amount of these additives is not particularly limited, but is preferably 1000 ppm or less. If it is the said range, while being able to suppress degradation by an ultraviolet-ray or a heat | fever, the characteristic of resin can be maintained.

In order to reinforce the organic EL, a reinforcing material may be incorporated into the sealing material and combined. The banners may collide with birds, stepping stones, etc., or may be hit by a wind and collide with a wall or be pulled. Therefore, it is preferable to reinforce so as to protect the organic EL. The reinforcing material is not particularly limited as long as it is a material that does not excessively block light emitted from the organic EL while increasing strength against tension, impact, and the like, and examples thereof include glass cloth and metal mesh. Composite means that a reinforcing material is installed so that the strength of the sealing material can be increased, and includes a state in which the reinforcing material is incorporated in or on the surface of the sealing material. When using a glass cloth or a metal mesh, the opening ratio is preferably 60% or more, more preferably 80% or more. Within the above range, light from the organic EL can be used efficiently.

  The film thickness of the sealing material is usually 200 μm or more and 1 mm or less, preferably 300 μm or more and 800 μm or less, more preferably 400 μm or more and 600 μm or less. If it is the said range, the penetration | invasion of deterioration sources, such as an ultraviolet-ray, oxygen, a water | moisture content, will be suppressed and the buffer function which protects an element can be obtained.

  The sealing material preferably has a light transmittance of 380 nm or less of 15% or less, and more preferably 8% or less. If it is the said range, deterioration of the luminescent material etc. by an ultraviolet-ray can be suppressed.

2. Protective film The banner of the present invention is laminated with a protective film that softens the impact applied to the organic EL. As described above, the banner may collide with a wall or the like when hit by a wind or a flying stone or hit by a wind. The protective film means a material in the form of a film that alleviates these impacts and exhibits a function of protecting the organic EL.

  The material of the protective film is not particularly limited. However, since the banner is preferably thin and made of a flexible material as described above, the material of the protective film is also preferably a polymer material. A resin having impact resistance is more preferable. Specifically, polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinylidene fluoride, polyvinyl fluoride, perfluoroalkoxy fluororesin, tetrafluoroethylene / hexafluoropropylene copolymer Fluorinated hydrocarbon resins such as united ethylene / tetrafluoroethylene copolymer and ethylene / chlorotrifluoroethylene copolymer; polyhydric alcohols such as hydroquinone, resorcin, bisphenol A, and bisalkyl carbonate, bisaryl carbonate, phosgene, etc. And polycarbonates synthesized from these carbonate esters. In particular, a fluorine-based hydrocarbon resin is preferable, and ETFE is more preferable.

  The thickness of the protective film is not particularly limited, but is usually 50 μm or more and 100 μm or less. Within the above range, it is possible to sufficiently ensure impact resistance while suppressing costs.

3. Sealing Layer The banner of the present invention is laminated with a sealing layer that encloses the structure of organic EL or the like in the banner and suppresses the intrusion of rainwater or the like.

The material of the sealing layer is not particularly limited. However, since the banner is preferably thin and made of a flexible material as described above, the material of the sealing layer is also preferably a polymer material. Considering that it is installed in harsh outdoor environments exposed to sunlight and rainwater, resins with excellent weather resistance are more preferable. Specifically, phenol resins, resorcinol resins, epoxy resins, unsaturated Thermosetting resin resins such as polyester resin, urea resin, melamine resin, polyurethane resin or acrylic resin, vinyl acetate resin, ethylene vinyl acetate copolymer resin, acrylic resin, cyanoacrylate resin , Polyvinyl alcohol resin, polyamide resin, polyolefin resin, thermoplastic polyurethane resin, saturated polyester resin or cellulose resin such as ester acrylate, urethane acrylate, epoxy acrylate, melamine acrylate, acrylic Various resins such as resin acrylate Radical polymerization type photocuring resin system using resin such as relate or urethane polyester, cationic polymerization photocuring resin system using resin such as epoxy, vinyl ether, thiol / ene addition type curing resin system, etc. A reinforced thin glass sheet is exemplified. Among these, ethylene vinyl acetate resin (EVA), urethane acrylate, and soft epoxy are particularly preferable.

  The thickness of the sealing layer is usually 200 μm or more and 1 mm or less, preferably 300 μm or more and 800 μm or less, more preferably 400 μm or more and 600 μm or less. If it is the said range, organic EL can be protected from rain water etc.

4). Scattering protection film In the banner of the present invention, a scattering protection film is attached to the outer surface in order to improve the visibility of the organic EL. The scattering protective film means a film that exhibits effects such as reflection of scenery on the surface of the vehicle guidance display object and reflection of sunlight and vehicle headlamps.

The above characteristics of the scattering protective film can be grasped by the parallel light transmittance and the total light transmittance of the film. The parallel light transmittance and the total light transmittance are JIS K 7105 “Testing method for optical properties of plastic”. Is a value measured in accordance with the following equation.
T _p = T _t −T _d
(T _t : Total light transmittance (%) T _d : Diffuse transmittance (%) T _p : Parallel light transmittance (%))
T _t = 100−R−A
(T _t : Total light transmittance R: Total light reflectance A: Absorption rate)

  The parallel light transmittance of the outer surface of the scattering protective film (side surface visually recognized by the driver or the like) is usually 40% or less, preferably 20% or less, and more preferably 10% or less. When it is in the above range, regular reflection on the surface of the banner can be prevented, and the burden on the driver's eyes and visual disturbance can be suppressed.

  Further, the total light transmittance on the organic EL side surface of the scattering protective film is preferably 60% or more, and more preferably 80% or more. Within the above range, light from the organic EL can be efficiently utilized and visually recognized.

  The material of the scattering protective film is not particularly limited, but it is preferable to use a resin having excellent weather resistance in consideration of being installed in a harsh outdoor environment exposed to sunlight or rainwater as a banner. Specific examples include polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinylidene fluoride, polyvinyl fluoride, perfluoroalkoxy fluororesin, ethylene tetrafluoride / hexafluoropropylene copolymer ethylene / tetrafluoroethylene copolymer Fluorocarbon resins such as polymers, ethylene / chlorotrifluoroethylene copolymers; polycarbonates synthesized from polyhydric alcohols such as hydroquinone, resorcin, and bisphenol A and carbonates such as bisalkyl carbonate, bisaryl carbonate, and phosgene Is mentioned. In particular, a fluorine-based hydrocarbon resin is preferable, and ETFE is more preferable.

  Moreover, in order to improve weather resistance, you may add a ultraviolet absorber, antioxidant, a light stabilizer etc. to a scattering protective film. The amount of these additives is not particularly limited, but the total addition amount is preferably 500 ppm or more and 5000 ppm or less. 1000 ppm or more and 3000 ppm or less are more preferable. If it is the said range, a favorable weather-resistance improvement effect and favorable interface adhesive strength can be acquired.

  Although the film thickness of a scattering protective film is not specifically limited, Usually, it is 50 micrometers or more and 200 micrometers or less, Preferably it is 100 micrometers or less. When it is in the above range, the generation of wrinkles and the like during cost and lamination can be suppressed.

The characteristics of the scattering protective film can also be grasped by the refractive index. The refractive index is preferably 1.6 or less, more preferably 1.5 or less, and further preferably 1.45 or less. Within the above range, partial reflection and total reflection at the interface can be suppressed, and light from the organic EL can be used more efficiently.

  The method for imparting the above-mentioned properties for reducing the parallel light transmittance to the scattering protective film material is not particularly limited, but in addition to utilizing the original properties of the resin used, for example, a method for forming an uneven structure on the film surface, And a method of dispersing the filler in the film resin. The concavo-convex structure may be formed on either the outer surface or the organic EL side surface, but is preferably formed on the outer surface from the viewpoint of suppression of bubbles and ease of formation. The lower limit of the height of the uneven structure is usually 0.2 μm or more, more preferably 0.4 μm or more, and particularly preferably 0.6 μm or more. The upper limit is preferably 100 μm or less, more preferably 60 μm or less, and particularly preferably 40 μm or less. By setting it within the above range, reflected light from the outside can be reduced without impairing the emission intensity of the organic EL. The period of the uneven structure is preferably 20 mm or less, more preferably 15 mm or less, and particularly preferably 12 mm or less. If the above is exceeded, the clarity of the display may be impaired. Moreover, a lower limit is 0.005 mm or more normally, Preferably it is 0.01 mm or more, More preferably, it is 0.05 mm or more. If the value is below the lower limit, the surface may be easily soiled.

  The method for forming the concavo-convex structure is not particularly limited, and a method of transferring the surface concavo-convex from the matrix by heat or pressure is mentioned.

5. Material and Design of Banner The base material used for the banner of the present invention is not particularly limited, and a material used for the banner can be appropriately selected. Specifically, a polyester fabric or a tarpaulin in which a polyester fiber and vinyl chloride are combined can be used.

  The banner of the present invention may include an air vent mechanism. The venting mechanism means that the design and material are selected so as to relieve the wind pressure applied to the banner. Specifically, it is necessary to make a hole (slit) in the banner or use a material with good ventilation. Can be mentioned.

  When opening the air holes, the number and form thereof are not particularly limited, and can be appropriately selected depending on the size of the banner. It is preferable that there is an air hole in a portion where the organic EL is not installed because the structure is simple and can be easily manufactured.

6). Other Configurations The banner according to the present invention is not particularly limited as long as it has the above-described configuration, and layers having other functions may be laminated, or devices, equipment, and facilities may be attached.

6-1. Reinforcing layer The banner of the present invention may be laminated with a reinforcing layer in order to increase the strength against tension, impact and the like. In order to reinforce the organic EL, the example in which the reinforcing material is incorporated into the sealing material has been described above (see [0035]), but the reinforcing layer exhibits the same function as this, and the sealing material is combined. It can also be used as an alternative.

The lamination position and material of the reinforcing layer are not particularly limited as long as the reinforcing layer can exhibit a reinforcing function. However, when it is installed on the display surface side (right side in FIG. 1) of the organic EL, light emitted from the organic EL is emitted. It is preferable to use a material that does not excessively block. Similar to the reinforcing material in the sealing material, glass cloth, metal mesh, or the like can be used, and these materials can be directly sandwiched between layers laminated on the banner to form a reinforcing layer. Further, like the sealing material, these materials may be combined with a resin and used as a reinforcing layer. The opening ratio of the glass cloth and the metal mesh is usually 50% or more, preferably 60% or more, more preferably 70% or more, still more preferably 80% or more, and usually 99 or less.

6-2. Dark color layer In the banner of the present invention, a dark color layer may be laminated in order to improve visibility. The dark color layer is a layer that prevents the light of the organic EL from leaking to the back side of the banner, and absorbs light emitted from the outside appropriately, thereby improving the visibility of the banner.

  The above functions of the dark color layer can be grasped by light transmittance and scattering rate in the 380-700 nm circumferential direction, and the transmittance and scattering rate can be measured using, for example, an integrating sphere spectrophotometer. it can. The transmittance of the dark color layer is usually 60% or less, preferably 40% or less, more preferably 20% or less, still more preferably 10% or less, most preferably 5% or less, and usually 0% or more. 1% or more is preferable. The scattering rate of the dark color layer is usually 10% or more, preferably 20% or more, more preferably 40% or more, still more preferably 60% or more, and usually 90% or less, preferably 80% or less. These transmittance and scattering rate ranges may satisfy either one or both, but it is preferable to satisfy both. Within the above range, the banner can exhibit excellent visibility.

The material of the dark color layer is not particularly limited, and examples thereof include a material using a black pigment or a black cloth. Specifically, a black pigment is mixed with a resin to form a film, or a black fabric is sandwiched with a resin and integrated. The types of black pigment and resin are not particularly limited, and examples of the black pigment include carbon black, and examples of the resin include ethylene vinyl acetate resin (EVA) and ETFE.
Moreover, it is preferable that a deep color layer is laminated | stacked between organic EL and a banner base material.

6-3. Operational equipment for organic EL In order to operate the organic EL, the banner of the present invention can be connected to a system power supply, or can be combined with a solar battery and a power storage device to be an independent power supply. By using an independent power supply, it can be operated even when the system power supply fails due to a disaster or the like. It can also be easily installed in places where it is difficult to connect to the system power supply due to the road structure.

  The solar cell to be used is not particularly limited, but it is preferable to use a small and lightweight solar cell in consideration of the output for operating the organic EL, for example, a film-like solar cell or a sheet substrate type solar cell A battery is mentioned.

  The power storage device used is not particularly limited, and examples thereof include a lithium ion secondary battery and an electric double layer capacitor. In consideration of the output for operating the organic EL, it is preferable to use a small and light-weight one, and it is particularly preferable to use a lithium polymer battery finished in a sheet form using a gel electrolyte or a solid electrolyte as the electrolyte.

  The type, form, and installation location of devices other than the organic EL are not particularly limited, but it is preferable to use a small and lightweight device in consideration of operating the organic EL.

  Light-emitting devices, power generation devices, and power storage devices are made into thin sheet-type devices (light-emitting devices: organic EL, power generation devices: film-like or sheet substrate type solar cells, power storage devices: sheet-type lithium polymer batteries), and these are further enclosed in a film Then, it may be integrated as a banner. Referring to FIG. 3, 17 represents an organic EL display surface, and 18 represents a solar cell (a sheet-type lithium polymer battery and a control device are enclosed in the front or back of the banner). It does not require an external power supply, is easy to transport and install, and does not impair the characteristics of the banner.

1 ... Banner base material display surface 2 ... Organic EL
3... Protective film 4... Sealing layer 5... Scattering protective film 6... Substrate 7. DESCRIPTION OF SYMBOLS 9 ... Hole transport layer 10 ... Light emitting layer 11 ... Hole blocking layer 12 ... Electron transport layer 13 ... Electron injection layer 14 ... Cathode 15 ... ... Banner surface 16 ... Organic EL (unit display)
17 ··· Projected characters 18 ··· Film-like solar cell

Claims (11)

A banner characterized in that an organic electroluminescence device, a protective film, a sealing layer, and a scattering protective film are laminated on a display surface. The banner according to claim 1, wherein the organic electroluminescent device is of a white light emitting type and includes a light emitting layer in which red, green, and blue light emitting materials are dispersedly doped in one layer. The banner according to claim 1 or 2, wherein the organic electroluminescence device is of a white light emission type and has a color temperature of 4000K or less. The organic electroluminescence device constitutes a unit display portion on a banner display surface, the area of the unit display portion is 500 cm ² or more, and the light emission area is 30% or more. The banner according to item 1. The banner according to any one of claims 1 to 4, wherein a reinforcing layer is laminated and / or a sealing material of the organic electroluminescence device is combined with a reinforcing material. The outer surface of the scattering protective film has a concavo-convex structure, and the concavo-convex structure has a height of 0.2 to 100 µm and a cycle of 20 mm or less. Banner. The banner according to any one of claims 1 to 6, wherein the scattering protective film is made of ETFE. The banner according to any one of claims 1 to 7, wherein the luminance is 200 cd / m ^{2 to} 3000 cd / m ² . The banner according to any one of claims 1 to 8, comprising an air vent mechanism. The banner according to any one of claims 1 to 9, comprising a solar cell and a power storage device. The banner according to claim 10, wherein the solar cell is of a film or sheet substrate type.