JP2017188399A - Organic el light source sheet, planar light emitter, interior lighting toy, and plaything - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an organic EL light source sheet, a planar light emitter, an interior lighting toy, and a plaything which are easy to be formed into a large area and free shape.SOLUTION: The organic EL light source sheet includes: a substrate 2 made of resin having flexibility in a form of a tape or a strip (rectangle or strip); a plurality of light emitting cells 3 of the same shape continuously formed on the substrate 2 along a long side direction of the substrate 2 and electrically connected on the substrate 2; and bus electrodes (anode bus electrode 8, cathode bus electrode 9) formed to extend in the longitudinal direction of the substrate 2 and connected to the plurality of light emitting cells 3.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to an organic EL light source sheet, a planar light emitter, an interior lighting toy, and a play equipment.

  In recent years, from the viewpoint of energy saving to prevent global warming, light emitting diodes (referred to as “LEDs”) and organic electroluminescent (EL) elements using inorganic semiconductors with higher luminous efficiency than incandescent bulbs and fluorescent lamps in lighting devices An illuminating device using a light source as a light source has attracted attention. In addition, since fluorescent lamps contain mercury, which is a heavy metal, they have a problem of waste disposal, and the movement of replacing them with LED or organic EL light sources that do not contain mercury is accelerating.

  A white LED obtains white light emission by absorbing blue light emission from a blue LED using a gallium indium nitride crystal into a powder of YAG phosphor or sialon phosphor and converting a part thereof into yellow light emission. . Currently, white LEDs having a luminous efficiency exceeding 200 lm / W are beginning to be marketed. As the LED light source, a product having a long life in which LT70, which is a time for the luminance to attenuate by 30%, exceeds 40,000 hours, is commercially available.

  However, white LEDs convert blue light into long-wavelength light, so that the energy efficiency is reduced due to the Stokes loss, and the maximum theoretical luminous efficiency remains at about 294 lm / W. If white light is obtained by combining high-efficiency light emitting elements independent of blue, green and red, the maximum theoretical efficiency may be further improved to about 361 lm / W. However, since the energy of green light emission has a composition with poor light emission efficiency called the green gap between the energy gaps of the GaInN-based crystal and the AlInGaP-based crystal, the light emission quantum yield is less than half that of blue. At present, high-efficiency and low-cost green LEDs exceeding 200 lm / w are still under development.

Further, since the LED is a point light source, there is an adverse effect on the eyes when a high-luminance point light source is directly observed. Therefore, the light is spread by a light guide plate or a reflection diffusion plate to make a lighting fixture. However, due to light loss at that time, the luminous efficiency of the lighting fixture may be reduced to about half of the rated value of the LED element.
The white LED has a long lifetime, but it is said that the peripheral material such as the lens resin and the reflective material exposed to the strong light of the point light source is deteriorated and the light transmittance is reduced, which is the cause of the luminance reduction. . In addition, since the white LED has a strong emission spectrum component of the blue LED in the emission spectrum, the white LED has a problem that it becomes cold white light emission and becomes light that does not feel cold and warm.

An organic EL panel using an organic EL element as a light source is rapidly improving the light emission efficiency. And since it is a surface light source, the light energy density per area is low compared with LED of a point light source, and there are few problems of the light deterioration of the resin film of a board | substrate, and heat deterioration. In addition, a thick heat sink for heat dissipation, such as LED lighting fixtures, is unnecessary and can be thinned.
Moreover, when an organic EL panel is used for a lighting fixture as a planar light source, the rated value of the high luminous efficiency of the organic EL panel can be obtained without loss as the luminous efficiency of the planar lighting fixture.

As an example of the high luminous efficiency of an organic EL light source, Non-Patent Document 1 discloses a flexible organic EL panel using a single layer graphene anode provided with a light extraction structure and a green phosphorescent light emitting material as a light emitting layer, and 1000 cd / m. A high efficiency of 200 lm / w at a luminance of ² o'clock and a high efficiency of 150 lm / w or more at 10000 cd / m ² have been reported.

Further, in Non-Patent Documents 2 and 3, a high refractive index substrate having a light extraction layer is used, and in the light emitting layer, an exciplex is formed by mixing a hole transporting host and an electron transporting host as a host, In addition, an organic EL device in which excitonic energy is transferred from a host molecule to a dopant molecule by doping a yellow phosphorescent light emitting material is manufactured, and 200 lm at xy chromaticity (0.44, 0.35) and luminance of 1000 cd / m ² . It has been reported that high efficiency exceeding / w was obtained. Furthermore, the white light-emitting organic EL panel, the initial luminance 9000cd / ^m 2, LT70 = in terms of 2000 hours from the initial luminance 1000cd / ^{m 2} LT70 = 18 million hours of long life have been reported.
Furthermore, flexible organic EL lighting is commercially available, and prototypes of flexible organic EL televisions have been announced.

Currently, organic EL panels that are commercially available for illumination are mainly panels having a size of about 8 cm to 30 cm square using a glass substrate. However, when the area is increased with a single cell of the metric size, there is a concern that the manufacturing yield of the panel is greatly reduced due to a short defect, resulting in high cost.
In addition, green and red light-emitting organic EL elements have a practically long life, but blue organic EL elements with good color purity have a lifetime that is about an order of magnitude shorter than LED light sources. For this reason, an organic EL panel with high blue light emission intensity cannot be produced, and it is practically used only for warm-colored white having a low color temperature.
Furthermore, the conventional organic EL panel is limited to a simple rectangular shape or the like for the convenience of an apparatus for cutting out a substrate or vacuum-depositing an organic EL material. Panels were difficult to make and difficult to use for interior equipment and playground equipment.

  In the use of surface light sources for backlights for liquid crystal displays, white light is produced by laminating a planar light emitter with a blue LED as an edge light on a light guide plate and a yellow light emitting organic EL panel that has a complementary color relationship with the light emission of the LED. In the case of white LEDs, energy loss due to Stokes loss that converts part of blue LED light to yellow has occurred. However, by stacking organic EL panels that emit complementary colors, the luminous efficiency of the backlight is improved. It can be improved (for example, Patent Document 1).

However, although the Stokes loss accompanying the conversion of blue light emission to yellow light emission of the LED can be reduced, there is a concern that light from the organic EL light source is scattered or reflected when passing through the light guide plate and energy is lost.
In addition, since one organic EL panel is overlapped with a light guide plate of the same shape, even if it can correspond to the size of the liquid crystal display, it can be used for large building materials such as illuminated walls and ceilings. However, it was difficult to deal with various designs.

  Similarly, for the use of a liquid crystal backlight, a light guide plate and an organic EL substrate can be mounted by attaching a red LED to the end surface of the transparent substrate of the blue and yellow organic EL panel (hereinafter referred to as the cut surface of the plate). There has also been proposed a flat light emitter that is also used, and the synthesized light becomes white, and the light is scattered and emitted from a light extraction portion such as an unevenness provided on the surface of the substrate (for example, Patent Document 2).

  However, the organic EL panel having a strong emission intensity of the blue light emitting component has a short life, and if the substrate of the organic EL panel and the light guide plate of the LED are integrated, it is difficult to increase the area and to form a free shape. In addition, the light extraction portion formed on the substrate surface prevents the substrate from transmitting the EL light emission. Therefore, when the panel is large, it is difficult to uniformly and uniformly extract the LED light emission and the EL light emission due to the distribution of the area where the light extraction portion is formed. It was a concern.

JP 2002-1000022 A Japanese Patent No. 4432299

Ning Li, 5 others, “High Performance Organic Light-Emitting-Diodes on Graphene Electrode and Thin c-Si TFT for Flexible Display and Lighting”, SID Symposium Digest of Technical Papers, The Society for Information Display, 2013, Volume 44 , P. 848-851 The 95th Annual Meeting of the Chemical Society of Japan, 2D3-50, (2015). Satoshi Seo and 6 others, “Exciplex-triplet energy transfer: A new method to achieve extremely efficient organic light-emitting diode with external quantum efficiency over 30% and drive voltage below 3 V”, Japanese Journal of Applied Physics (JJAP), Japan Society of Applied Physics, 2014, Volume 53, 042102

  In view of the circumstances as described above, an object of the present invention is to provide an organic EL light source sheet, a planar light emitting body, an interior lighting toy, and a playground equipment, which can be easily increased in area and free form.

An organic EL light source sheet according to an aspect of the present invention is a continuous resin-made substrate having a tape-like or strip-like (rectangular or strip-like) shape and a long side direction of the substrate on the substrate. A plurality of light emitting cells having the same shape formed and electrically connected on the substrate, and bus electrodes extending in the longitudinal direction of the substrate and connected to the plurality of light emitting cells. It is characterized by.
The planar light-emitting body by one aspect | mode of this invention is a light-guide plate, the LED light source provided in at least one end surface of this light-guide plate, and at least one board surface of the said light-guide plate. An organic EL light source sheet is laminated.

An interior lighting toy according to an aspect of the present invention includes a planar light emitter configured as described above, the light guide plate has a shape other than a rectangle, and the organic EL light source sheet is a plate on one side or both sides of the light guide plate. It is attached to the surface with an area of 30% or less of the plate surface area on both sides of the light guide plate.
A play equipment according to one embodiment of the present invention is characterized in that a plurality of planar light emitters having the above-described configuration having a touch sensor panel are attached.

  According to one aspect of the present invention, there are provided an organic EL light source sheet, a planar light emitter, an interior lighting toy, and a play equipment that are easy to increase in area and have a free shape.

It is a top view which shows the organic electroluminescent light source sheet which concerns on one Embodiment of this invention. It is the II sectional view taken on the line of FIG.6 (e) which shows an organic electroluminescent light source sheet | seat. It is an II-II line sectional view of Drawing 6 (e) showing an organic EL light source sheet. It is an III-III line sectional view of Drawing 6 (e) showing an organic EL light source sheet. It is explanatory drawing which shows the manufacturing method of an organic electroluminescent light source sheet. It is explanatory drawing which shows the manufacturing method of an organic electroluminescent light source sheet. It is a top view which shows the state with which the some organic EL light source sheet was connected to the longitudinal direction. It is a schematic diagram which shows an example of an organic EL light source unit. It is a schematic diagram which shows an example of an organic EL light source unit. It is a perspective view which shows the planar light-emitting body which concerns on one Embodiment of this invention. It is a front view which shows the state which narrowed the non-light-emission area | region of the organic electroluminescent light source sheet, and was connected to the longitudinal direction. It is a schematic diagram which shows the state which accumulated and connected the adjacent organic EL light source sheet. It is a perspective view which shows the light-guide plate provided with the light-diffusion reflection part. It is sectional drawing which shows the planar light-emitting body provided with the light-diffusion reflection part. It is sectional drawing which shows the planar light-emitting body provided with the light-diffusion reflection part. It is sectional drawing which shows the planar light-emitting body provided with the light-diffusion reflection part. It is a perspective view which shows the play equipment which affixed the planar light-emitting body on the cylinder. It is a front view which shows the interior lighting toy which concerns on one Embodiment of this invention. It is sectional drawing which shows the interior lighting toy concerning one Embodiment of this invention.

  In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of embodiments of the present invention. However, it will be apparent that one or more embodiments may be practiced without such specific details. In other instances, well-known structures and devices are schematically shown in order to simplify the drawing.

<Organic EL light source sheet>
[Configuration of organic EL light source sheet]
For the organic EL light source sheet 1, it is possible to use an element having a bottom emission structure in which EL light is emitted from the substrate side and a top emission structure in which EL light is transmitted from the electrode on the opposite side of the substrate. is there. In the present embodiment, the organic EL light source sheet 1 will be described as a bottom emission structure element used for a general organic EL light source sheet as a light emitting cell structure. As shown in FIGS. 1 to 6, the organic EL light source sheet 1 according to this embodiment includes a substrate 2, a light emitting cell 3, an anode extraction electrode 6, a cathode extraction electrode 7, an anode bus electrode 8, and a cathode. A bus electrode 9, an edge protection film 11, an insulating sealing material 12, and a sealing sheet 13 are provided. Furthermore, when the organic EL light source sheet 1 is used, an anode electrode terminal 4, a cathode electrode terminal 5, and an electrode connection fitting 10 are provided.

The board | substrate 2 is a sheet-like board | substrate which has a light transmittance.
The light emitting cell 3 has a substantially rectangular shape and is continuously formed on the substrate 2 along the long side direction of the substrate 2. The light emitting cell 3 includes a light emitting region auxiliary electrode 14, a transparent anode 15, an organic EL medium layer 16, a cathode 17, and a barrier film 18. In the present embodiment, as shown in FIG. 1, the anode electrode terminal 4 and the cathode electrode terminal 5 are preferably provided on both ends of the short side of the substrate 2 and connected to an external power supply device.

The anode extraction electrode 6 and the cathode extraction electrode 7 are provided between the light emitting cells 3 of the substrate 2 and at both ends of the short side, and preferably connected to the anode electrode terminal 4 and the cathode electrode terminal 5 at both ends of the short side of the substrate 2, respectively. The
The anode bus electrode 8 and the cathode bus electrode 9 are formed along the longitudinal direction of the substrate 2 on both ends of the long side on the substrate 2. The anode bus electrode 8 is connected to the light emitting region auxiliary electrode 14 and the transparent anode 15 of the light emitting cell 3 through the anode extraction electrode 6. The cathode bus electrode 9 is connected to the cathode extraction electrode 7 and the cathode 17 of the light emitting cell 3.

The electrode connection fittings 10 are preferably provided at both ends of the short side of the substrate 2, connecting the anode electrode terminal 4 to the anode bus electrode 8 through the anode extraction electrode 6, and connecting the cathode electrode terminal 5 to the cathode through the cathode extraction electrode 7. Connect to bus electrode 9.
The edge protection film 11 is laminated on the substrate 2, the anode extraction electrode 6 and the cathode extraction electrode 7 to cover the unevenness at the end of the electrode layer and prevent an electrical short circuit of the EL element.
The insulating sealing material 12 is composed of a dam material 12 a and a fill material 12 b and is formed so as to cover the edge protection film 11 and the light emitting cell 3.
The sealing sheet 13 is formed so as to cover the insulating sealing material 12.
In addition, the detail of each said structure is demonstrated in the manufacturing method of the organic electroluminescent light source sheet 1 mentioned later.

[Method for producing organic EL light source sheet]
A method for manufacturing the organic EL light source sheet 1 according to the present embodiment will be described with reference to FIGS. 5 and 6. First, as shown in FIG. 5A, on the substrate 2, an anode bus electrode 8, a cathode bus electrode 9, an anode extraction electrode 6 in contact with the anode bus electrode 8, and a cathode extraction electrode 7 in contact with the cathode bus electrode 9; Then, the light emitting region auxiliary electrode 14 in contact with the anode extraction electrode 6 is formed.
As the substrate 2, a plastic film having flexibility and light transmission, in which an inorganic glass layer having a thickness of less than 5 μm is formed as a barrier film against water vapor or oxygen on the surface on which at least the organic EL element is formed, It is preferable to use a substrate such as a sheet in order to obtain a light-emitting element having a lifetime. If a tape-shaped organic EL light source sheet is continuously produced by a roll-to-roll method using a substrate made of a flexible plastic film, it can be mass-produced efficiently. Moreover, by making the board | substrate 2 the said structure, not only flexibility and lengthening are attained, but the organic EL light source sheet 1 is cut | disconnected to required length, and it is tiled so that it may become required light emission shape. Since they can be used by being attached, it is not necessary to manufacture and prepare organic EL light sources having various shapes, and the productivity of the lighting device is improved.

Materials for flexible plastic film substrates include polyolefin films, polyester films, aliphatic amine monomers, highly transparent and heat resistant polyimide films with fluorine substituents, and nanofibers such as cellulose. A transparent resin sheet having a low expansion / contraction ratio obtained by impregnating a resin into the resulting sheet can be preferably used. A substrate film or sheet having a thickness of about 5 to 100 μm can be preferably used.
The anode bus electrode 8 and the cathode bus electrode 9 are, for example, a film of tin, indium, aluminum, silver, copper, or gold laminated on the substrate 2, an alloy film mainly containing them, a film of metal glass, or a transparent conductive film. The conductive oxide film is etched and patterned, or is patterned and used by a mask vapor deposition method, a sputtering method, an electroless plating method, an electrodeposition method, or the like. The anode bus electrode 8 and the cathode bus electrode 9 are formed to have a thickness of about 0.1 μm to 10 μm.

At that time, in a region where the substrate 2 is bent or repeatedly bent, in order to prevent disconnection due to cracking, a highly conductive aluminum, gold, or the like having a resistivity at room temperature of 3 × 10 ⁻⁶ Ωcm or less with a single metal, Laminated using at least one layer each selected from a layer selected from silver and copper and a layer of a metal that is soft and does not easily crack when bent and contains 50% by mass or more of a metal selected from tin, indium and bismuth. It is more preferable to use the bus electrode. For example, an indium: silver (mass ratio 9: 1) alloy is soft and has an elongation rate of 61% and can easily follow the bending of the substrate, and is preferable in preventing cracks and disconnection due to repeated bending of the aluminum electrode. In addition, the bus electrode portion in a region that is not bent or repeatedly bent is formed of a transparent conductive oxide film such as an indium tin composite oxide (ITO) film, an indium zinc composite oxide film, or an Al-doped zinc oxide film. You can also

  The anode take-out electrode 6 and the cathode take-out electrode 7 can be easily cut with scissors or the like, and pierce the staple-like electrode connection fitting 10 to ensure reliable electrical continuity with the anode electrode terminal 4 and the cathode electrode terminal 5. Therefore, a thickness of about 1 μm to 100 μm is desirable. In addition, the anode extraction electrode 6 and the cathode extraction electrode 7 are made of a soft metal having a Young's modulus smaller than aluminum, such as indium, bismuth, tin, and magnesium, or an alloy film containing them so that it can withstand bending of the light source sheet. A film of particles, a coating film of conductive paste in which amorphous metal, metallic glass, Ag paste, carbon, graphene, or the like is mixed, a laminated film thereof, or a mixed film thereof is used.

  The light emitting region auxiliary electrode 14 is formed when the transparent anode 15 has a high resistance value and uneven light emission occurs due to a voltage drop in the light emitting region, and when not necessary, a part of the transparent anode 15 directly serves as an anode extraction electrode. It is formed to touch. The light emitting region auxiliary electrode 14 has a shape substantially corresponding to the light emitting portion, and is made of aluminum, silver, gold, or the like that secures light transmission in a slit shape, a mesh shape, a honeycomb shape, or the like as required for resistance reduction. It is formed of a metal film or a transparent conductive oxide film. The light emitting region auxiliary electrode 14 is preferably provided so that the light transmittance is 80% or more, more preferably 90% or more. The light emitting region auxiliary electrode 14 is provided such that when the transparent anode 15 is provided, the surface resistance of the electrode combined with the light emitting region auxiliary electrode 14 is 100Ω / □ or less, more preferably 10Ω / □ or less.

  As shown in FIG. 5A, one or two thinned or thinned portions may be provided and connected to the connection portion of the light emitting region auxiliary electrode 14 with the anode extraction electrode 6. This causes an electrical short between the anode and the cathode of the organic EL element, and when a current exceeding the rating flows, the thinned portion or thinned portion is overheated and blown, or the substrate 2 and the sealing member are sealed. Cracking occurs due to the difference in thermal expansion coefficient with the stop sheet 13 and the like, and the resistance becomes high so that it can serve as a fuse. An alloy having a melting temperature of 150 ° C. or lower is preferably used for the thinned portion or the thinned portion. For example, in the thinned portion or the thinned portion, an alloy such as an indium: silver (mass ratio 97: 3) alloy having an eutectic point of 143 ° C. or an indium: tin (mass ratio 50:50) alloy having a liquidus temperature of 125 ° C. The same material as the light emitting region auxiliary electrode 14 or a material having a high electrical resistance such as a conductive paste can be used.

  Next, as shown in FIG. 5B, a transparent anode 15 is formed on the light emitting region auxiliary electrode 14. The transparent anode 15 is a sputtered film such as an inkjet coating film of a conductive polymer such as PEDOT: PSS, an indium tin composite oxide film, an indium zinc composite oxide film, a conductive transparent oxide film such as Al-doped zinc oxide, or the like. Coating film such as nanotubes, or conductive oxide nanoparticles, carbon nanotubes or silver nanowires neutralized PEDOT: PSS or other conductive polymers, polyethyleneimine or quaternary ammonium groups on the main chain or side It consists of a coating film or the like dispersed in a polymer such as polyparaphenylene, polyfluorene, or transparent polyimide that is present in at least a part of the chain. The transparent anode 15 preferably has a light transmittance of 80% or more. Further, the transparent anode 15 has an ionization energy of 5 eV to 6 eV close to the level of HOMO (maximum occupied orbit) of the material in contact with the transparent anode 15 of the organic EL medium layer 16, and is easy to inject holes into the organic EL medium. Material is selected. The film thickness is about 10 nm to 1 μm.

  Further, as shown in FIG. 5C, the end portion of the electrode layer is covered with an edge protective film 11 having a thickness of about the electrode layer or more as necessary. As a result, it is possible to suppress dielectric breakdown due to the concentration of electric charges on the electrode ends, and electrical short-circuiting of the elements due to the unevenness of the film ends of the light emitting region auxiliary electrode 14 and the transparent anode 15. The edge protective film 11 is a process of coating, exposing, developing, and thermal cross-linking using a positive photoresist material having a thermal cross-linking group such as an epoxy group so that the cross section of the opening of the light emitting portion becomes a forward taper after exposure and development. In order. Since the edge protection film 11 is connected to the light emitting portion and the cathode 17, the edge protection film 11 is formed on the entire surface leaving a part on the cathode bus electrode 9.

  Thereafter, as shown in FIG. 5D, the organic EL medium layer 16 is formed on the transparent anode 15. The organic EL medium layer 16 is formed by coating and laminating a layer composed of a hole injecting and transporting layer, an electron transporting light emitting layer, and the like by vacuum deposition, an inkjet method, a printing method, or the like. The hole injecting and transporting layer may be laminated by separating the function into a hole injecting layer and a hole transporting layer, and further by separating the function into three layers of a hole injecting and transporting layer, a hole transporting layer, and an electron blocking layer. It may be laminated. The electron-transporting light-emitting layer may be functionally separated and laminated into a light-emitting layer and an electron-transport layer, and further functionally separated into four layers of a light-emitting layer, a hole blocking layer, an electron transport layer, and an electron injection layer. May be. The light emitting layer is formed of a single light emitting material or a combination of a light emitting dopant made of an organic fluorescent material, an organic phosphorescent material, or a thermally activated delayed fluorescent (TADF) material and a light emitting host material.

White light emission is a mixture of red, green, and blue light-emitting materials, or a stack of red, green, and blue light-emitting layers, or a light-emitting layer that has a blue to blue-green light-emitting region and a yellow or red light-emitting layer. It can be obtained by lamination with a mixed light emitting layer of green and red light emitting materials.
The thickness of the light emitting layer is preferably about 1 nm to 50 nm, and the total thickness of the organic EL medium layer 16 is about 20 nm to 200 nm.

  In addition, between the electron injection layer and the hole injection layer between each organic EL element unit such as red, blue, green light emission, etc., a laminated film layer of a low work function metal of several nm or less, a high work function metal or a transparent conductive film Alternatively, a multiphoton light-emitting EL element in which a charge generation layer (also referred to as an intermediate layer) made of a charge transfer material or the like generated by stacking or mixing an electron accepting material and an electron donating material is sandwiched. In that case, the current efficiency and the driving voltage can be approximately doubled by stacking the light emitting layers, and an element with little change due to the driving voltage of the emission color can be obtained.

Next, as shown in FIG. 6A, a cathode 17 made of a metal having a low resistance and a high light reflectance such as aluminum or silver is in contact with the cathode bus electrode 9 on the organic EL medium layer 16 so as to be conductive. And formed by a mask vacuum deposition method or the like.
Furthermore, as shown in FIG. 6 (b), for water vapor barrier and electrical insulation, silicon oxynitride film, atomic layer alternate deposition such as alumina, titania, silica, etc., or a laminated film thereof, if necessary, A barrier film 18 made of a laminate film of these materials and a metal film containing a metal such as aluminum, tin, or indium is formed with a thickness of about 10 nm to 2 μm so as to cover the cathode 17.

Thereafter, as shown in FIG. 6C, when the outer periphery of the sealing sheet 13 made of a laminate of resin films and the substrate 2 are bonded together, the region surrounded by the portion corresponding to the outer edge of the barrier film 18 A dam material 12a of an insulating sealing material 12 having a high moisture-proof property and a sealing adhesive property using a hot-melt adhesive or an inorganic adhesive such as silica mixed with an epoxy adhesive that can be bonded and cured by light or heat. Apply.
Next, as shown in FIG. 6D, on the inner side surrounded by the dam material 12a applied along the outer periphery of the barrier film 18, a viscous polymer such as polyisobutene or A highly flexible fill material 12b corresponding to a flexible device containing a desiccant in liquid paraffin or the like is applied. As the filling material 12b, for example, a coating desiccant OleDry (registered trademark) for organic EL manufactured by Futaba Electronics Co., Ltd. using an alkoxide compound of organoaluminum, or a material in which fine particles of calcium oxide are dispersed in a polymer is used. can do. Preferably, the ultraviolet curable fill material 12b is applied to the sealing sheet 13 with a thickness of several μm to several tens of μm and cured with ultraviolet light, and then the uncured fill material 12b is formed on the surface with a thickness of 1 μm or less. Apply. Thereby, it can prevent that the barrier film 18, the cathode 17, and the filling material 12b adhere, and when the organic EL light source sheet 1 is bent, the cathode 17 can be prevented from peeling off. When there is no need for a desiccant in the filling material 12b, the area of the dam material 12a in FIG. 6C and the filling material 12b in FIG. You can also

Further, as shown in FIG. 6E, the surface of the sealing sheet 13 on which the insulating sealing material 12 is applied and the surface on which the organic EL medium layer 16 is formed on the substrate 2 face each other and are bonded.
Note that at least the steps from film formation to sealing of the cathode 17 are performed in vacuum or in an inert gas atmosphere in order to prevent oxidation and moisture absorption deterioration of the cathode material of the organic EL element and the sealing material such as the fill material 12b. It is desirable. The organic EL light source sheet 1 is manufactured through the above steps.

When the organic EL light source sheet 1 is used, the organic EL light source sheet 1 is cut on the anode extraction electrode 6 and the cathode extraction electrode 7 provided between the light emitting cells 3 so as to have a desired length. The surface can be an organic EL light source having an arbitrary length in which the number of light emitting cells is 1 element or more and n + 2 elements are connected (n is an integer of 0 or more).
Then, the anode electrode terminal 4 and the cathode electrode terminal 5 are staple-like electrode connection fittings 10 etc. on the portions corresponding to the ends of the anode extraction electrode 6 and the cathode extraction electrode 7 which are the ends of the organic EL light source sheet 1 whose length is adjusted. Each. This ensures electrical continuity between the anode electrode terminal 4 and the anode extraction electrode 6 and between the cathode electrode terminal 5 and the cathode extraction electrode 7, respectively. The anode electrode terminal 4 and the cathode electrode terminal 5 may have a shape integrated with the electrode connection fitting 10.

The obtained organic EL light source sheet 1 may have wiring attached to the anode electrode terminal 4 and the cathode electrode terminal 5, and the entire sheet may be moisture-proof sealed with a barrier film having at least a light emitting surface transparent. When a voltage of about 3 V to 10 V is applied between the anode electrode terminal 4 and the cathode electrode terminal 5, holes and electrons are injected into the light emitting layer, and an excited state of light emitting material molecules is created to emit light. Thereby, high luminance light emission of about 1000 cd / m ² to about tens of thousands cd / m ² can be obtained.
The organic EL light source by the organic EL light source sheet 1 emits light by direct current drive, and does not cause flickering or noise as in the fluorescent light by alternating current drive of the electric light line, and it is applied to the eyes by the heat line like an incandescent lamp There is no adverse effect and there is little fear of fire. Moreover, there is no glare by spot-like high-intensity light emission like normal LED lighting.

[Organic EL light source unit]
In the present embodiment, as shown in FIG. 7, the organic EL light source sheet 1 is electrically connected between the anode electrode terminals 4 and the cathode electrode terminals 5 in the long side direction, thereby further increasing the length of the tape. An organic EL light source sheet can be obtained. Moreover, the light source unit of the organic EL light source sheet 1 suitable for the target length can be easily obtained by connecting the organic EL light source sheets 1 having different numbers of cells in one organic EL light source sheet 1. The organic EL light source unit may be moisture-proof sealed with a barrier film having a transparent light emitting surface at least.

  As shown in FIG. 8 (the light emitting surface is shown on the back side), the organic EL light source sheets 1 are laminated in the short side direction and bonded together, and between the anode electrode terminals 4 between the organic EL light source sheets 1 and the cathode electrode terminals. An organic EL light source unit 21 that is electrically connected in series with each other can also be formed. As shown in FIG. 8, when the organic EL light source unit 21 connected in series is connected to the power source 20 by the wiring 19 and is driven by direct current, the driving is performed by the number of stages required for driving one organic EL light source sheet 1. A voltage is required.

  Further, as shown in FIG. 9, the organic EL light source unit 21 may be driven by an AC lamp line. In this case, a maximum voltage of 141V is applied when the effective voltage of the AC lamp line is 100V. When AC driving is performed, no light is emitted while a reverse bias is applied. Therefore, by using the organic EL light source unit 21 in which the organic EL light source sheets 1 are connected in about 20 stages, direct driving with an AC power line is possible, and it is not necessary to use an AC-DC converter, thereby reducing costs. There are advantages you can do. However, in this case, since light is emitted every cycle of the AC voltage of the power line, flickering due to the frequency of the power line occurs. In order to reduce this flicker, it is effective to perform AC driving at 100 Hz or more using an inverter.

Furthermore, as shown in FIG. 9, in the case of the organic EL light source unit 21 in which the polarities of the organic EL light source sheets 1 are reversed and arranged alternately and the respective terminals are connected to each other, the AC phase changes half between plus and minus. A set of organic EL light source sheets 1 arranged every other stage can be made to emit light alternately every period.
By using such an organic EL light source unit 21 which is a multi-stage unit, wall lighting from a floor to a ceiling of 2 m or higher can be directly driven using an AC power line as a power source, and the application range is expanded. .

<Planar light emitter>
Next, the configuration of the planar light emitter 22 according to the present embodiment will be described. As shown in FIG. 10, the planar light emitter 22 includes the organic EL light source unit 21, the light guide plate 23, and the LED light source unit 24 described above. The planar light emitter 22 includes an organic EL light source unit 21 and an LED light source unit 24 that are attached to the light guide plate 23 with an adhesive tape, an adhesive, or the like.
At that time, the organic EL light source sheets 1 having different emission colors can be arranged to form a planar light emitter 22 that emits light in a rainbow-colored gradation or pattern.

By using a material having a refractive index between the refractive index of the substrate 2 and the refractive index of the light guide plate 23 as the adhesive used, the incident light from the organic EL light source unit 21 is reflected on the light guide plate 23. Less and lower loss.
For the light guide plate 23, a resin having a high light transmittance of 0.5 mm to 10 mm is preferably used. For example, for the light guide plate 23, a resin plate having a transmittance of 80% or more for visible light, such as an acrylic resin, a polycarbonate resin, a silicone resin, a polyolefin resin, and an epoxy resin is used. Moreover, when using for a curved surface or obtaining flexibility, it is preferable to use a resin plate having a thickness of about 0.5 mm to 1.5 mm as the light guide plate 23. Thereby, the planar light-emitting body 22 can be easily pasted according to the cylindrical column, the surface of the utility pole, or the like. The light guide plate 23 also serves as a protective plate that prevents the organic EL light source unit 21 from being damaged when an object hits the planar light emitter 22.

  Moreover, in the planar light-emitting body 22, in order to obtain as uniform a light-emitting surface as possible, it is necessary to narrow the non-light-emitting area between the light-emitting areas of the organic EL light source sheet 1. As an example of narrowing the non-light emitting region, FIG. 11 shows a longitudinal sectional view of the organic EL light source sheet 1 with the light emitting surface down. In the example shown in FIG. 11, the non-light emitting area 26 between the light emitting areas 25 of the light emitting cells 3 of the organic EL light source sheet 1 is bent and bonded and fixed as shown in the figure, and the non-light emitting portion interval between the light emitting areas 25 is fixed. In the example shown in FIG.

  Further, in the case of connecting in a longitudinal direction, as shown in FIG. 11, a metal clip or the like is provided between the electrode terminal portions 27 (the anode electrode terminal 4 and the cathode electrode terminal 5) of the organic EL light source sheet 1. The connection between the organic EL light source sheets can be established by pinching and connecting with the connecting jig 28, connecting with conductive staples, or bonding with a conductive adhesive or tape.

  With reference to FIG. 12 viewed from the light emitting surface, a method for producing the organic EL light source unit 21 in which the gaps of the non-light emitting regions of the organic EL light source sheet 1 are further narrowed will be described. As shown in FIG. 12, a plurality of organic EL light source sheets 1 are connected in a state in which the portions of the non-light emitting regions 29 at the side end portions of the organic EL light source sheets 1 arranged adjacent to each other are overlapped. At this time, if the non-light emitting region 29 is light transmissive, the light transmissive non-light emitting region 26 of another organic EL light source sheet 1 is overlaid on the adjacent light emitting region 25 so that the light emitting region 25 is a gap. You may arrange so that it may line up without. Then, by connecting the anode electrode terminal 4 and the cathode electrode terminal 5 between the organic EL light source sheets in series, depending on the thickness of the substrate 2 and the sealing sheet 13, the non-light emitting region 29 between the light emitting regions. , 26 can be narrowed to within 2 mm.

  Furthermore, in the planar light emitter 22 shown in FIG. 10, the LED light source units 24 are respectively attached to the end surfaces of the opposing sides of the light guide plate 23 and the LED light is incident, but the number of the LED light source units 24 is not limited, It may be at least one place. The incident LED light is diffused in the light guide plate 23 and reflected by the mirror-like cathode 17 surface of the organic EL light source sheet 1, so that the surface of the light guide plate 23 opposite to the surface on which the organic EL light source sheet 1 is installed. Are emitted together with light emitted from the organic EL light source sheet 1. Therefore, in the planar light-emitting body 22 which concerns on this embodiment, the lack of intensity | strength of the blue light emission component of the organic electroluminescent light source sheet 1 can be supplemented with LED light. Moreover, the low-color-rendering property by the lack of the green light emission component of white LED based on blue LED, and the fault of the light emission nonuniformity by a point light source can be supplemented with the organic electroluminescent light source sheet 1 of the green planar light emission of high efficiency. For this reason, by laminating the organic EL light source sheet 1 on the light guide plate 23 with LED, the planar light-emitting body 22 having a large area, high efficiency, and high color rendering can be easily produced at low cost.

  At that time, the light emission of the organic EL light source sheet 1 is transmitted through the light guide plate 23, and the light emission of the LED light source attached to the end face of the light guide plate 23 is uniform from the surface opposite to the surface on which the organic EL light source unit 21 is attached. Need to be emitted. Therefore, as in the example shown in FIG. 13, the light diffusing / reflecting portion 30 that diffuses and reflects the LED light incident on the light guide plate 23 is formed on at least one surface of the back surface of the light guide plate 23. At that time, when the light diffusing and reflecting portion is formed on the surface side where the organic EL light source unit 21 is laminated, the distance that the light is diffused from the light diffusing and reflecting portion is increased by the thickness of the light guide plate 23, and the in-plane is more uniform. It is easy to emit light with a high brightness.

As a method for forming the light diffusing and reflecting section 30, as shown in FIG. 13, a method of printing a white ink such as a circle or an ellipse on at least one surface of the light guide plate 23 in a dot shape of a circle or an ellipse. is there.
White ink dot-like printing can be formed at low cost. However, when trying to make the amount of LED light extracted from the light guide plate 23 as uniform as possible in a portion that is far from the LED light source and in a nearby portion, as shown schematically in FIG. It is necessary to reduce the dot area or dot density of the portion 30 at a portion where the light amount is close to the LED light source unit 24 and large at a portion where the light amount is far away. Therefore, the ratio of the light from the stacked organic EL light source unit 21 that is blocked by the white ink dots increases as the distance from the LED edge light increases, and it may not be possible to obtain uniform light transmission from the organic EL light source. There is.

  On the other hand, a method for forming the light diffusive reflecting portion 30 other than printing of the dot-like white ink that can transmit light more uniformly in the plane is desired. As an example, cross-sectional schematic diagrams of the planar light-emitting body 22 are shown in FIGS. In the case of the example in FIG. 14, dot-like or lattice-like holes or line grooves extending in the thickness direction of the light guide plate 23 as viewed from the plate surface are formed. In the case of a wire groove, it can be a continuous line or an intermittent line. As a method for digging holes and grooves shown in FIG. 14, holes or grooves may be digged in the light guide plate 23 with a drill. Moreover, you may press the type | mold which formed the unevenness | corrugation heated on the resin surface of the light-guide plate 23. FIG. Further, a laser beam with an adjusted output may be irradiated in a spot shape, and the resin of the light guide plate 23 may be sequentially ablated in a dot shape to form dot-shaped holes or lattice-shaped grooves.

  In the case of the example of FIG. 15, the glass transition temperature, the phase transition temperature at which the refractive index changes, the crystallization temperature, the melting temperature, the decomposition temperature, etc. are previously measured by a differential scanning calorimetry, a thermogravimetric analyzer, or a refractive index measuring device. The light guide plate 23 using the resin whose physical properties have been analyzed is locally heated with a laser beam or the like in the form of dots or lattice lines at least to a phase transition temperature, a crystallization temperature or a decomposition temperature equal to or higher than the glass transition temperature, and then cooled. By adjusting the temperature and speed, the phase change portion and the crystallization portion where the refractive index and reflectance are changed are formed. Thereby, light can be scattered and reflected.

  In addition, when the grooves and the dots of the light diffusive reflecting portion 30 are formed by changing the output of the laser beam and the depth of focus during irradiation to melt, change the phase, or crystallize, the depth of the phase change portion or the crystallization portion is increased. By modulating the sheath length, the desired light diffusion intensity of the LED light can be obtained depending on the location within the surface of the light guide plate 23.

In the example shown in FIG. 14 and FIG. 15, the dot holes and the crystallization parts of the light diffusion reflection part 30 are formed deeper and longer as the distance from the LED light source attached to the end face of the light guide plate 23 increases. The amount of light diffusion and reflection increases, and the light emitted from the LED can be extracted more uniformly on the surface of the light guide plate. Further, it can be realized by forming a hole or a crystallized region deeper and longer than the peripheral portion in the portion to be enhanced and emphasized.
Japanese Patent No. 5585129 can be referred to for a laser device and a processing method used when manufacturing dots and lattice grooves by a laser.

  Depending on the shape of the dots of the light diffusing / reflecting part 30 formed on the light guide plate 23, there is a possibility that the light transmission of the organic EL light source may be hindered. Therefore, as an example of a specific dot shape for preventing light transmission, the dot width is 0.3 mm to 0.6 mm, for example, and the dot length is 0 when viewed from the top of the light guide plate with the plate surface placed horizontally. When forming a grid-like continuous line groove with a constant area of a circle or ellipse of 3 mm to 0.9 mm, it is formed with a width of 0.05 mm to 0.2 mm, and the pitch of dots and grid lines is The light transmittance from the organic EL light source can be adjusted to 80% or more, more preferably 85% or more, and further preferably 90% or more by adjusting the pitch by forming the film to 1 mm or more and 10 mm or less.

Further, in order to make the in-plane distribution of the amount of light transmitted from the organic EL light source through the light guide plate 23 uniform, or to emphasize the brightness of a specific part, the distribution and density of dots in the light guide plate 23 are adjusted. It becomes possible. Further, the orientation distribution of the light from the LED light source unit 24 that has passed through the light guide plate 23 is obtained by modulating and correcting the length of the dot holes and the crystallization portion in the depth direction from the surface of the light guide plate 23. The distribution of the amount of light transmitted from the organic EL light source can also be corrected or adjusted.
Further, the width x in the longitudinal direction of the substrate 2 in the non-light emitting region between the light emitting cells 3, the shortest pitch y between the dots or line grooves of the light diffusing / reflecting portion 30, and the thickness z of the light diffusing layer 33 are expressed by the formula (1). It is preferable to satisfy the condition in order to obtain a light emitting surface with less light emission unevenness.
4z ≧ x> y (1)

  Moreover, in the cross-sectional schematic diagram of an example of the planar light-emitting body 22 shown in FIG. 16, the surface of the light-guide plate 23 on the opposite side to the surface where the organic EL light source unit 21 composed of at least one organic EL light source sheet 1 is provided. In the example, the light diffusion layer 33 is formed by laminating the light diffusion sheet 31 and the prism lens sheet 32. In the planar light-emitting body 22, it is desirable to provide at least one of the light diffusion sheet 31 and the prism lens sheet 32 as the light diffusion layer 33 so as to have a uniform light-emitting surface.

  The light diffusion sheet 31 can reduce luminance unevenness of the planar light emitter 22 by diffusing light from the light emitting region on the organic EL light source sheet 1 to the non-light emitting region. The light diffusing sheet 31 includes, for example, a sheet in which high light diffusing high-refractive-index nanoparticles are contained in a transparent resin binder and applied to one or both sides of a resin sheet, polyolefin-based or polystyrene-based, polyethylene terephthalate-based, Light-transmitting sponge containing urethane-type, silicone-type, fluorine-type independent or open-cell light-transmitting foam and porous resin sheet, or a sheet of resin sheet embossed on the surface or nanofiber A sheet or the like is used. One or more light diffusion sheets 31 are laminated on the surface of the light guide plate 23 opposite to the organic EL light source sheet 1 with a thickness of 0.2 mm or more and 25 mm or less.

  Further, in order to sufficiently eliminate unevenness in light emission, the thickness of the light diffusion sheet 31 is ¼ or more of the width of the non-light emitting area between the light emitting areas of the light emitting cells 3 on the organic EL light source sheet 1, more preferably 1 / It is desirable to use at a thickness of 2 to 2 times. If it is thicker than twice, the optical loss increases, which is not preferable. Therefore, as shown in FIG. 11, the non-light emitting region 26 is folded, or as shown in FIG. 12, the non-light emitting portion at the side end of the organic EL light source sheet 1 is overlapped on the adjacent sheet. Is preferably narrowed. As a result, the light diffusion sheet 31 can be thinned, the thickness of the planar light emitter 22 can be reduced, and the in-plane luminance of light emission can be made more uniform. The width of the non-light emitting region 26 between the light emitting cells 3 on the organic EL light source sheet 1 is desirably 10 mm or less, more preferably 2 mm or less.

In addition, the material such as the foamed resin sheet used for the light guide plate 23 and the light diffusion layer 33 preferably contains an antistatic material or is coated or laminated with a conductive layer having high light transmittance. Furthermore, these materials have a surface resistivity of 10 ¹⁴ Ω / □ or less, more preferably 10 ¹² Ω / □ or less, in order to prevent electrostatic breakdown of the organic EL light source sheet 1 and LED and dust adsorption. It is desirable to use rate plates and sheets.

Further, the light diffusing layer 33 absorbs an impact when an object hits or rubs the surface of the planar light-emitting body 22 and prevents the surface of the light guide plate 23 from being damaged or cracked. It is possible to prevent deterioration of the light emission and changes in the in-plane distribution of light emission.
Further, the light diffusing layer 33 may contain a material having moisture absorption and release properties such as cellulose nanofibers and zeolite nanoparticles. In this case, it is also effective in suppressing condensation on the wall surface.
Further, an aromatic component such as perfume may be included in the light diffusion sheet 31 or on the surface of the light diffusion layer 33. In this case, for example, the fragrance from the wall surface can be enjoyed for a long period of time by being included in cyclodextrins having a high sustained release property of the aromatic compound.

When the light diffusing sheet 31 is made of a porous material having a high porosity such as a silicone rubber / gel porous material or a fluorine-based resin having high translucency and continuous pores, Photocatalyst nanoparticles that are capable of visible light decomposition of volatile organic compounds containing titanium oxide or tungsten oxide as a main component and containing palladium or the like may be included on the sheet surface. In this case, volatile organic compounds that cause sick house syndrome such as indoor organic solvents such as formaldehyde and toluene can be decomposed. In that case, a silicone rubber / gel porous body having an energy gap of 1 eV or more larger than the energy gap of the photo-oxidation catalyst so as not to be photodegraded as compared with acrylic resins and urethane resins, etc. It is preferable to use a silicone resin or a fluororesin foam or porous body having continuous pores because deterioration of the light diffusion sheet can be suppressed.
In addition, the outer surface of the light diffusion sheet 31 made of foamed resin or porous material has a higher density than the inside so that it is easy to prevent or clean tobacco smoke, graffiti, etc. A skin layer having fine irregularities in nanometer units may be provided on the surface having high light diffusion and transparency.

The prism lens sheet 32 includes a microlens array, a microprism array, or a combination thereof. The prism lens sheet 32 is manufactured by embossing a resin layer on a base film such as a polyester film. The prism lens sheet 32 adjusts the angle at which light from an LED light source or an organic EL light source is emitted from the light guide plate 23, and emits light of an emission color. While reducing the viewing angle dependency, there is a role of protecting the porous and soft surface of the light diffusion sheet 31. Further, the surface of the prism lens sheet 32 becomes a diffusive reflecting surface, which is effective for suppressing reflection of external light and improving the surface texture.
When the prism lens sheet 32 is laminated on the light diffusion sheet 31, a large number of through-holes can be provided in the prism lens sheet 32 and combined with the light diffusion sheet 31. By adjusting the diameter and density of the through pores to provide air permeability or adjusting the gas permeability, it is possible to adjust humidity, photodecompose volatile organic substances, adjust the release rate of aromatic components, and the like.

  Also, when the organic EL light source sheet 1 is composed of a plurality of light emitting cells 3 and the light emitting cells 3 are light absorbing non-light emitting regions, light loss occurs due to light absorption or leakage in the non light emitting regions. There is. In order to suppress the loss of light, the surface of the organic EL light source sheet 1 of the tape-like or strip-like resin sheet substrate 2 other than the EL light emitting region on the surface opposite to the surface on which the organic EL elements are laminated is used. It is preferable to form a light reflection diffusion layer 34 having a visible light reflectivity of 90% or more in a region other than the EL light transmission region in the case where the end of the long side is arranged in an overlapping manner (see FIGS. 15 and 16). ). As the light reflection diffusion layer 34, an ink coating layer in which titanium oxide fine particles having a high refractive index or the like are dispersed in a polymer, or a foamed resin sheet made of polyethylene terephthalate or the like having a hole in a portion corresponding to a light emitting region is bonded. Can be used.

Further, light leakage from the end face of the light guide plate 23 other than the LED light receiving portion can be suppressed by applying a light reflecting tape such as a white tape around the end face.
Moreover, as an LED element of the LED light source unit 24 attached to the end surface of the light guide plate 23, a white LED element, a blue LED element, an orange LED element, a red LED element, or the like can be preferably used.
A white LED element with a color temperature of 4000K or higher or a cold white LED element with a daylight color or a blue LED element is used as a white LED element, and a warm white organic EL light source with a color temperature of 3500K or less or a warm white light bulb color as an organic EL light source By combining the above and adjusting the light emission intensity and mixing the light, it is possible to obtain a planar light-emitting body 22 capable of adjusting and adjusting white light having a desired color temperature.

In addition, when the blue LED is attached to the end face of the light guide plate 23 and the organic EL light source sheet 1 having the respective emission colors of green and red is attached to a part of the plate surface of the light guide plate 23 with the light guide plate 23 interposed therebetween. Can be a planar light emitter that can be adjusted to a desired color other than white by adjusting the light emission intensity of each light source.
Further, when the curved light guide plate 23 is used, it can also be used for room lights and backup lights for automobiles with high design.

Furthermore, by using the planar light emitter 22 that combines an LED light source unit using a red LED element and a flexible red organic EL light source, the light guide plate 23 having a curved surface can be easily handled. For this reason, the planar light-emitting body 22 can be used for a tail light or a brake lamp for automobiles, and the glare peculiar to the LED brake lamp can be reduced, and the high luminance necessary for braking can be compensated.
In addition, by using a planar light emitter that combines an LED light source unit 24 using an orange LED element and a flexible orange organic EL light source, the planar light emitter 22 can be similarly used for an automotive blinker light.

Further, as shown in FIG. 16, between the light guide plate 23 and the organic EL light source sheet 1 laminated on the light guide plate 23, the average light transmittance of ultraviolet to blue components having a wavelength of 370 nm or more and 470 nm or less. Alternatively, a blue-green to red film having a high average light transmittance having a wavelength of 470 nm or more and 750 nm or less may be laminated as the organic EL deterioration preventing layer 35.
As the film used for the organic EL deterioration preventing layer 35, an ultraviolet blue light cut film containing zinc oxide, tin oxide or the like, or a dichroic film made of a multilayer dielectric film can be used. The organic EL deterioration preventing layer 35 can reduce the incidence of blue component light on the organic EL light source sheet 1 from ultraviolet rays that may cause light degradation of the light emitting layer of the organic EL light source sheet 1. The life of the body 22 can be extended.

  Further, at least a portion between the light guide plate 23 and the substrate 2 of the organic EL light source sheet 1 laminated on the light guide plate 23 absorbs blue or green light emission having a wavelength of 550 nm or less of the LED light, and a wavelength of 560 nm. A light emitting color conversion layer containing the above-described fluorescent dye emitting red may be provided as the organic EL deterioration preventing layer 35. In this case, it is possible to reduce the incidence of blue light on the organic EL light source sheet 1 that may accelerate the deterioration of the organic EL element, and to enhance red light emission.

Further, at least one of the surface of the organic EL light source unit 21, the surface of the light guide plate 23, the surface of the light diffusion sheet 31, and the surface of the prism lens sheet 32 on the side where the prism or lens is not formed is light transmissive. At least one of a picture, a figure, and a character may be drawn with ink containing a high color material.
Examples of color materials with high light transmission include metal nanoparticles such as silver and gold, and ink containing nanoparticles of red, pink, orange, yellow, green, blue, amber, brown, etc. made of composite metals thereof. Is mentioned. They have high coloring power, transparency, and light resistance, and can transmit light from a surface light emitter more than when using a normal pigment ink, so that a beautiful color can be obtained and high durability can be obtained. .

Further, a pearl pigment obtained by coating a metal oxide such as titanium dioxide with a thickness of about 60 nm to 160 nm on tabular transparent particles of 1 μm or less such as mica, silica, alumina, etc. has light transmittance and reflectivity, Since the wavelength of transmitted light and reflected light can be controlled from blue to red depending on the thickness of the metal oxide, it can be preferably used in the present invention.
Further, an ink having a small light absorption loss made of a colloidal crystal gel having a structural color in which monodisperse fine particles such as polystyrene and silica are arranged can be preferably used. Furthermore, when the planar light-emitting body 22 on which characters and designs are drawn is made to emit light with the ink containing them, the designs of characters and flowers are more prominent and appear three-dimensional and vivid, or the emission color changes depending on the viewing angle. High durability is obtained because the color is not developed by light absorption.
In addition, by changing the thickness of the light diffusion sheet 31 or forming a hole, it is possible to express characters and pictures.

In addition, a light-transmitting touch sensor panel of a resistive film type or the like is incorporated between the light guide plate 23 and the light diffusion layer 33 and at least in a part of the light diffusion layer 33, and each organic material constituting the planar light-emitting body 22. It can function as a switch for controlling the light emission of the EL light source sheet 1, and can also be used as a play equipment such as a fortune telling device.
For example, in the example shown in FIG. 17, the planar light emitter 22 is provided so that each organic EL light source sheet 1 is vertically arranged and covers the outer periphery of a column 37 placed on a pillar in a building or a garden. The planar light-emitting body 22 is configured such that each organic EL light source sheet 1 can independently control and adjust brightness and color, and is driven to emit light in a stripe shape. A transparent resistive film type touch sensor panel 36 or the like is incorporated in an area touched by a hand between the light guide plate 23 and the light diffusing layer 33 constituting the structure. In such a planar light-emitting body 22, when the touch sensor panel 36 is touched from above the light diffusion layer 33 of the planar light-emitting body 22 and is stroked in a horizontal direction, a stripe-like shape is formed according to the stroking direction and speed. Light emission shifts to the adjacent one by one for the organic EL light source sheet 1, and the light emission line starts to rotate. When the touch sensor panel 36 is touched again, control is performed so that only the organic EL light source sheet 1 of a specific vertical line is left and the remaining organic EL light source sheet 1 is extinguished. In this case, for example, if a fortune such as Daikichi, Yoshi, and Evil is drawn on a pillar, the emitted line can be used as a play equipment such as a glowing fortune-telling device that indicates the fortune of the person.

In addition to the touch sensor panel 36, a combination of at least one of a human sensor using infrared rays, microwaves, ultrasonic waves, and a sound sensor is used in combination, so that it is automatically only when a person is near the cylinder 37. The planar light-emitting body 22 can be controlled so as to emit light (smart lighting), or can be controlled so as to start to shine in response to applause or utterance.
In addition, a flower picture is printed on the planar light emitter 22, and when the flower picture is touched, the EL light source unit switches on and emits light in the color of the flower, and the EL light source unit generates heat on the light diffusion sheet 31. Volatilization of the contained fragrance can be promoted so that the scent can be felt.

These planar light emitters 22 can be used for houses, hotels, karaoke rooms, temples, vehicles, airplanes, ships, toilets, bathrooms, bedrooms, music halls, display cases, show windows, etc. Advertising. Building materials such as illuminated walls and ceilings. It can be widely used in columnar displays, utility pole lighting and advertisements, street lamps, passage lights, garden lights, POP (point of purchase) advertisements, playground equipment, and the like.
Further, when the planar light emitter 22 is used for ceiling illumination, the shape of the light guide plate 23 may be a polygonal system other than a quadrangle. For example, a hexagonal or octagonal light guide plate 23 can also be preferably used, and at least a part of the front and back surfaces thereof is provided with an organic EL light source unit 21 composed of one or more organic EL light source sheets 1 and a part of the end surface. LED light source unit 24 is provided.

  In addition, in the planar light-emitting body 22 using a light guide plate designed in a desired shape such as a vehicle such as a vehicle, a night view of a city or a port, the earth, the moon, or an advertising product such as a beverage container, the light guide plate 23 is designed. A planar light-emitting body 22 in which the organic EL light source unit 21 is attached to one or both sides of an area within 30% of the plate surface and the LED light source unit is provided on a part of the end surface of the light guide plate 23. There may be.

Further, a light diffusing portion provided with unevenness or the like may be formed on the light guide plate 23, a touch sensor panel may be incorporated, or a light emitting color conversion layer, characters or patterns may be provided as necessary.
In addition, a transparent piezo film speaker is laminated in the light diffusing layer 33 or on the light diffusing sheet 31 made of a porous or foamed material, so that the luminance and color of light emission of the planar illuminant 22 are modulated and driven in accordance with music. However, it can also be made into an interior lighting toy, design lighting, and lighting sound device in which light and sound are harmonized.

An example of the planar light emitting body 22 used as an interior lighting toy or design lighting will be described with reference to the boat-shaped interior lighting toy shown in FIGS.
The organic EL light source unit 21 is affixed to at least one plate surface below the waterline of the hull of the ship-shaped light guide plate 23. The LED light source unit 24 is attached to the end surface of the bottom of the ship so that the light emission of the LED can enter from the end surface of the light guide plate 23, and the drive circuit program incorporating the light emission intensities of the organic EL light source unit 21 and the LED light source unit 24. It can be adjusted arbitrarily.

  The light guide plate 23 has a rotating shaft 39 with a gear or a roller passing in the vicinity of the center of gravity. The drive box 40 incorporates a swing motor, an LED light source unit 24, an organic EL light source unit 21, a battery and motor drive circuit for driving the swing motor, and a light source unit drive circuit. The ship of the light guide plate 23 swings around a rotation shaft 39 attached to the housing 41.

At that time, if only the light from the LED light source unit 24 emitting blue light is emitted, this light is emitted not only from the plate surfaces on both sides of the light guide plate but also from the end surfaces, so the surrounding floor, wall, Illuminate the ceiling blue and express the background of the sea. Further, when only the organic EL light source unit 21 that emits warm white light is emitted, the warm white light emission of the organic EL light source sheet 1 is strongly diffused through the light diffusion window 42 provided in the shape of the ship window on the light guide plate 23, and the voyage at night. Can be expressed. In addition, when both the organic EL light source unit 21 and the LED light source unit 24 emit light, the light can be changed to white light having a high color temperature that is a mixture of both, and can be illuminated.
Furthermore, by using a plurality of organic EL light source sheets 1 and adding the organic EL light source sheet 1 including a red light emitting cell in the emission color, it is possible to create an atmosphere in which the sunrise or sunset hits the hull and is reflected. The light diffusion window 42 can be easily formed by processing the hull surface of the light guide plate into irregularities, and the light emission amount can be controlled by the depth and area of the irregularities.

  As described above, the planar light-emitting body 22 of the present invention only combines the advantages of an inorganic LED light source and an organic EL light source to obtain a flexible planar light-emitting body capable of long-lasting and various light emission. It can be combined with functions such as humidity control, deodorization, fragrance spreading, touch sensor panels and transparent piezo film speakers, wall lighting, ceiling lighting, interior lighting toys, design lighting, lighting sound equipment, vehicles and It can be preferably applied to lighting, indicator lights, indicator lights, playground equipment, etc. for ships and aircrafts.

<Effect of embodiment>
(1) An organic EL light source sheet 1 according to an aspect of the present invention includes a flexible substrate 2 made of tape or a strip (rectangle or strip), and a substrate along the long side direction of the substrate 2. A plurality of light emitting cells 3 of the same shape that are continuously formed on the substrate 2 and electrically connected on the substrate 2, are formed extending in the longitudinal direction of the substrate 2, and are connected to the plurality of light emitting cells 3. Bus electrodes (anode bus electrode 8 and cathode bus electrode 9).
According to the configuration of (1) above, a plurality of organic EL light source sheets can be connected in the longitudinal direction and the width direction, and further cut in units of light emitting cells. For this reason, the organic EL light source sheet which is easy to make in a large area or a free shape is provided.

(2) In the configuration of (1) above, the surface of the substrate 2 on the side opposite to the side on which the plurality of light emitting cells 3 are formed includes a plurality of the surfaces of the substrate 2 on the side on which the plurality of light emitting cells 3 are formed. A white light reflection diffusion layer 34 is formed so as to cover a region overlapping with a non-light emitting region which is a region where no light emitting cell is formed.
With configuration (2) above, it is possible to obtain a light emitting surface with little unevenness in brightness and high uniformity.
(3) The planar light emitter 22 according to an aspect of the present invention includes a light guide plate 23, an LED light source (LED light source unit 24) provided on at least one end surface of the light guide plate 23, and at least one of the light guide plate 23. The organic EL light source sheet 1 having the configuration (1) or (2) is laminated on the plate surface.
According to the configuration of the above (3), the planar light-emitting body 22 excellent in dimming property and toning property is provided. Moreover, the lifetime of the planar light-emitting body 22 can be improved.

(4) In the configuration of the above (3), the light guide plate 23 has the light diffusion reflection part 30 formed by holes, phase transition or crystallization in the plate.
(5) In the configuration of (4), the light guide plate 23 has a dot-like or linear light diffusing reflection part 30 in the plate as viewed from the thickness direction of the light guide plate, and the dot-like or linear light diffusive reflection. At least one parameter of the length, thickness, and depth of the portion 30 varies depending on the position in the light guide plate 23.
According to the configurations of (4) and (5) above, a uniform light emitting surface can be obtained and the light emission intensity of a desired portion can be adjusted.

(6) In the configurations of (3) to (5) above, the organic EL light source sheet 1 is laminated on one surface of the light guide plate 23, and the light guide plate 23 has a fixed pattern as viewed from the thickness direction of the light guide plate 23. The light diffusing sheet 31 and the prism are disposed on the plate surface of the light guide plate 23 on the side where the organic EL light source sheet 1 is not laminated. A light diffusing layer 33 including at least one of the lens sheets 32 is laminated, the width x in the longitudinal direction of the substrate 2 in the non-light emitting region between the light emitting cells 3, the shortest pitch y between the dots or the line grooves of the light diffusing reflection part, and the light. The thickness z of the diffusion layer 33 satisfies the expression (1).
4z ≧ x> y (1)
According to the configuration of (7) above, at least one of the drawn picture, figure, and character, a beautiful color with low light loss and high visibility can be obtained, and high durability that is not easily deteriorated by light can be obtained. .

(7) In the configuration of (6), the light diffusion sheet 31 includes a foamed resin sheet or a porous resin sheet.
According to the configuration of (7) above, the planar light emitter 22 with less unevenness in light emission luminance is provided.
Moreover, the aromatic planar light-emitting body 22 can also be provided by containing an aromatic component in the light diffusion sheet 31.
(8) In the configuration of (7) above, the light diffusion sheet 31 contains a catalyst capable of photodegrading volatile organic substances with visible light.
According to the configuration of the above (8), the planar light emitter 22 excellent in deodorizing property and safety is provided.

(9) In any configuration of the above (3) to (8), the wavelength between the light guide plate 23 and the substrate 2 is larger than the average light transmittance of ultraviolet to blue components having a wavelength of 370 nm to 470 nm. An ultraviolet blue light cut film or a dichroic film having a high average light transmittance from blue green to red of 470 nm to 750 nm is laminated.
According to the configuration of (9) above, the lifetime of the planar light emitter 22 can be improved.

(10) In the configuration of any one of (3) to (8), at least a part between the light guide plate 23 and the substrate 2 absorbs light having a wavelength of 550 nm or less and emits light having a wavelength of 560 nm or more. It further has an emission color conversion layer.
According to the configuration of (10) above, the red light emission component of the planar light emitter 22 can be enhanced.
(11) In any one of the constitutions (3) to (10), the organic EL light source sheet 1 includes a warm white light emitting organic EL element having a color temperature of 3500K or less, and the LED light source unit 24 has a color temperature of 4000K or more. White light emitting LED elements.
According to the configuration of (11) above, the chromaticity range of light emission of the planar light emitter 22 can be variously changed by adjusting the ratio of the light emission intensity of the organic EL element and the white light emitting LED.

  (12) In the configuration of any one of (3) to (11) above, the organic EL light source sheet, the organic EL light source unit 21 that is a drive unit by electrically connecting the plurality of organic EL light source sheets, and the light guide plate 23 At least one of a picture, a figure, and a character is drawn on at least one surface of the metal, and at least one of the picture, the figure, and the letter is a metal nanoparticle, a nanoparticle made of a composite metal of the metal nanoparticle, and a pearl It includes at least one of a pigment and a colloidal crystal gel having a structural color.

(13) In the configuration according to any one of (6) to (8), the organic EL light source sheet, the organic EL light source unit 21 having a plurality of organic EL light source sheets electrically connected as drive units, and a light diffusion sheet At least one of a picture, a figure, and a character is drawn on at least one surface of 31 and the prism lens sheet 32, and at least one of the picture, the figure, and the letter is composed of metal nanoparticles and a composite metal of the metal nanoparticles. It contains at least one of nanoparticles, a pearl pigment, and a colloidal crystal gel having a structural color.
According to the configurations of (12) to (13) above, it is possible to express characters and designs with a small light transmission loss.

(14) In the configuration of any one of (6) to (8) and (13) above, a touch sensor panel built between the light guide plate 23 and the light diffusion layer 33 or at least part of the light diffusion layer 33 36 or transparent piezo film speakers.
According to the configuration of (14), the light emission of the planar light emitter can be controlled by the touch sensor panel, and the light emission in harmony with music can be performed by the transparent piezo film speaker.

(15) An interior lighting toy according to an aspect of the present invention has a planar light emitter having any one of the above configurations (3) to (14), the light guide plate has a shape other than a rectangle, and an organic EL The light source sheet is attached to the plate surface on one side or both sides of the light guide plate with an area of 30% or less of the plate surface area on both sides of the light guide plate.
According to the configuration of (15) above, it is possible to produce an interior lighting toy with high design using the light guide plate 23 having a free shape.

(16) In the configuration of (15), the light guide plate is configured to be partially rotatable about at least one axis.
According to the configuration of (16) above, it can be used as an interior lighting toy or POP advertisement with high eye-catching properties.
(17) A playground equipment according to one aspect of the present invention is provided with a plurality of planar light emitters configured as described in (14) above.
According to the configuration of (17) above, it is possible to emit various patterns according to the touch on the planar light emitter, and it is possible to make a play equipment that attracts people and does not get tired.

DESCRIPTION OF SYMBOLS 1 Organic EL light source sheet 2 Substrate 3 Light emitting cell 4 Anode electrode terminal 5 Cathode electrode terminal 6 Anode take-out electrode 7 Cathode take-out electrode 8 Anode bus electrode 9 Cathode bus electrode 10 Electrode connection metal fitting 11 Edge protection film 12 Insulation sealing material 12a Dam material 12b Fill material 13 Sealing sheet 14 Light emitting area auxiliary electrode 15 Transparent anode 16 Organic EL medium layer 17 Cathode 18 Barrier film 19 Wiring 20 Power supply 21 Organic EL light source unit 22 Planar light emitter 23 Light guide plate 24 LED light source unit 25 Light emitting area 26 Non-light emitting area 27 Electrode terminal section 28 Connection jig 29 Non-light emitting area 30 Light diffusing / reflecting section 31 Light diffusing sheet 32 Prism lens sheet 33 Light diffusing layer 34 Light reflecting / diffusing layer 35 Organic EL deterioration preventing layer 36 Touch sensor panel 37 Cylinder 38 Sensor 39 Rotating shaft 40 Drive box 41 housing 42 Light diffusion window

Claims (17)

A tape-shaped or strip-shaped resin substrate;
A plurality of light emitting cells of the same shape, which are continuously formed on the substrate along the long side direction of the substrate and electrically connected on the substrate;
An organic EL light source sheet comprising: a bus electrode extending in the longitudinal direction of the substrate and connected to the plurality of light emitting cells.   The surface of the substrate opposite to the side on which the plurality of light emitting cells are formed has a region where the plurality of light emitting cells are not formed on the surface of the substrate on the side on which the plurality of light emitting cells are formed. The organic EL light source sheet according to claim 1, wherein a white light reflection diffusion layer is formed so as to cover a region overlapping with the non-light emitting region. A light guide plate;
An LED light source unit provided on at least one end face of the light guide plate;
The planar light-emitting body characterized by laminating | stacking the organic electroluminescent light source sheet of Claim 1 or 2 on the at least one plate surface of the said light-guide plate.   The planar light-emitting body according to claim 3, wherein the light guide plate has a light diffusive reflection portion formed in the plate by holes, phase transition, or crystallization. The light guide plate has the light diffusive reflection portion in the form of dots or lines as seen from the thickness direction of the light guide plate,
5. The surface according to claim 4, wherein at least one of a length, a thickness, and a depth of the dot-shaped or linear light diffusive reflecting portion varies depending on a position in the light guide plate. Light emitter. The organic EL light source sheet is laminated on one surface of the light guide plate,
The light guide plate has dot-like or linear light diffusing reflection parts arranged in a fixed pattern as seen from the thickness direction of the light guide plate,
On the plate surface of the light guide plate on the side where the organic EL light source sheet is not laminated, a light diffusion layer including at least one of a light diffusion sheet and a prism lens sheet is laminated,
The width x in the longitudinal direction of the non-light emitting region between the light emitting cells, the shortest pitch y between the dots or line grooves of the light diffusing reflection part, and the thickness z of the light diffusing layer satisfy the formula (1). The planar light-emitting body according to any one of claims 3 to 5.
4z ≧ x> y (1)   The planar light-emitting body according to claim 6, wherein the light diffusion sheet includes a foamed resin sheet or a porous resin sheet.   The planar light-emitting body according to claim 7, wherein the light diffusion sheet contains a catalyst capable of photodegrading volatile organic substances with visible light.   Between the light guide plate and the substrate, an ultraviolet blue having an average light transmittance of blue-green to red having a wavelength of 470 nm or more and 750 nm or less is higher than that of an ultraviolet to blue component having a wavelength of 370 nm or more and 470 nm or less. A planar light emitter according to any one of claims 3 to 8, wherein a light cut film or a dichroic film is laminated.   The light emission color conversion layer which absorbs light with a wavelength of 550 nm or less and emits light with a wavelength of 560 nm or more is further provided in at least a part between the light guide plate and the substrate. The planar light-emitting body of any one of Claims. The organic EL light source sheet includes a warm white light emitting organic EL element having a color temperature of 3500K or less,
The planar light-emitting body according to any one of claims 3 to 10, wherein the LED light source unit includes a white light-emitting LED element having a color temperature of 4000K or more. At least one of a picture, a figure, and a character is drawn on at least one surface of the organic EL light source sheet, an organic EL light source unit in which a plurality of organic EL light source sheets are electrically connected and used as a drive unit, and the light guide plate And
At least one of a picture, a figure, and a character includes at least one of metal nanoparticles, nanoparticles composed of a composite metal of the metal nanoparticles, and a pearl pigment or a colloidal crystal gel having a structural color. Item 12. The planar light emitter according to any one of Items 3 to 11. On the surface of at least one of the organic EL light source sheet, an organic EL light source unit in which a plurality of organic light source EL sheets are electrically connected and used as a drive unit, and the light diffusion sheet and the prism lens sheet, pictures, drawings, and characters At least one of
At least one of a picture, a figure, and a character includes at least one of metal nanoparticles, nanoparticles composed of a composite metal of the metal nanoparticles, and a pearl pigment or a colloidal crystal gel having a structural color. Item 9. The planar light emitter according to any one of Items 6 to 8.   The touch sensor panel or the transparent piezo film speaker further incorporated between the light guide plate and the light diffusion layer or at least in a part of the light diffusion layer. 2. The planar light emitter according to item 1. The planar light emitter according to any one of claims 3 to 14,
The light guide plate has a shape other than a rectangle,
The organic EL light source sheet is attached to a plate surface on one side or both sides of the light guide plate with an area of 30% or less of a plate surface area on both sides of the light guide plate.   The interior light toy according to claim 15, wherein the light guide plate is configured to be partially rotatable about at least one axis.   A play equipment to which a plurality of the planar light emitters according to claim 14 are attached.