WO2016084472A1 - Surface light-emitting module - Google Patents
Surface light-emitting module Download PDFInfo
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- WO2016084472A1 WO2016084472A1 PCT/JP2015/077744 JP2015077744W WO2016084472A1 WO 2016084472 A1 WO2016084472 A1 WO 2016084472A1 JP 2015077744 W JP2015077744 W JP 2015077744W WO 2016084472 A1 WO2016084472 A1 WO 2016084472A1
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- light
- emitting module
- layer
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- wavelength conversion
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Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/841—Self-supporting sealing arrangements
Definitions
- the present invention relates to a surface emitting module, and in particular, a part of excitation light emitted from an electroluminescent layer is wavelength-converted by a wavelength conversion layer, thereby mixing the excitation light and the wavelength-converted light to obtain light of a desired color.
- the present invention relates to a so-called color conversion type surface emitting module.
- a surface emitting module provided with a surface emitting light source represented by an organic electroluminescent element (hereinafter referred to as an organic EL (Electro Luminescence) element) has attracted attention.
- the organic EL element can obtain high luminance with low power consumption, and exhibits excellent performance in response and the like.
- a surface light-emitting panel including an organic EL element (so-called organic EL panel) is lightweight and can be bent flexibly, which is advantageous in that various types of lighting devices can be configured.
- white is often desired as the illumination light color.
- a whitening technique of the organic EL element there are a method in which two or more kinds of dopants having different emission wavelengths are included in the electroluminescent layer, and a method in which two or more electroluminescent layers having different emission wavelengths are stacked.
- the number of dopants increases, which complicates the film forming process, and the number of light-emitting layers increases, resulting in a decrease in yield. Therefore, there are many problems in manufacturing.
- the whitening technology using the color conversion method is provided with a wavelength conversion layer containing a fluorescent or phosphorescent substance inside or outside the electroluminescent layer, and a part of the excitation light emitted from the electroluminescent layer is converted into the wavelength converting layer. In this case, the excitation light and the wavelength converted light are mixed to obtain pseudo white light.
- this color conversion method it is only necessary to add a wavelength conversion layer to the organic EL element with the basic configuration, so there are few problems in terms of manufacturing, and it is possible to manufacture relatively easily and with high yield. Is obtained.
- the organic EL panel has a light emitting region and a non-light emitting region located along the outer periphery of the light emitting region when viewed from the light emitting surface side. This is because it is necessary to seal the electroluminescent layer in order to ensure the reliability of the organic EL element, and the organic EL element including the electroluminescent layer is sealed with the sealing layer on the transparent substrate. This is because a region where the electroluminescent layer does not exist is located around the organic EL panel by being stopped. Therefore, if no countermeasure is taken, there arises a problem that the boundary between the light emitting region and the non-light emitting region becomes conspicuous.
- the apparent light emitting area on the light emitting surface is expanded, and the boundary between the light emitting area and the non-light emitting area is blurred, which can be made inconspicuous.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2004-311153
- the wavelength conversion layer contains a fluorescent light-emitting substance or a phosphorescent light-emitting substance therein, and these fluorescent light-emitting substance or phosphorescent light-emitting substance exists in the state of fine particles dispersedly arranged in the binder. Therefore, the wavelength conversion layer has not only an effect of converting the wavelength of a part of incident light but also an effect of diffusing a part of incident light. As a result, the light emitted from the electroluminescent layer and emitted to the outside via the wavelength conversion layer contains the following three components.
- the first component is a component that is directly transmitted through the wavelength conversion layer without being wavelength-converted by the wavelength conversion layer.
- the second component is a component that is wavelength-converted and diffused in the wavelength conversion layer.
- the third component is a component that is only diffused without being wavelength-converted in the wavelength conversion layer. That is, the first component and the third component are excitation light itself, and the second component is wavelength converted light after wavelength conversion of the excitation light.
- the second and third components are light diffused in the wavelength conversion layer, when the optical path length from the electroluminescent layer to the wavelength conversion layer becomes longer, when viewed from the light emitting surface side.
- the luminance distribution becomes smooth.
- the first component is light that is not diffused by the wavelength conversion layer, the luminance distribution has a steep change when viewed from the light exit surface side.
- the light emitted from the light emission surface of the portion corresponding to the light emitting region includes the first and third components that are excitation light and the second component that is wavelength converted light at a predetermined ratio.
- the light emitted from the light emitting surface of the portion corresponding to the non-light emitting region hardly contains the first component that is the excitation light, and is the second component that is the wavelength converted light and the excitation light. A large amount of the third component is contained.
- the present invention has been made to solve the above-described problems, and in a surface light emitting module employing a color conversion method, these light emitting regions are made inconspicuous at the boundary between the light emitting region and the non-light emitting region. It is an object of the present invention to suppress the occurrence of a difference between the color of light emitted from the light emission surface of the portion corresponding to 1 and the color of light emitted from the light emission surface of the portion corresponding to the non-light emitting region.
- a surface emitting module includes a light emitter, a light diffusing unit, a wavelength converting unit, and a light emitting surface.
- the luminous body includes an electroluminescent layer that emits excitation light when a voltage is applied thereto.
- the light diffusion part is a part that diffuses the excitation light without converting the wavelength of the excitation light emitted from the light emitter.
- the wavelength conversion unit is located on a side opposite to the side where the light emitter is located when viewed from the light diffusion unit, and a part of the excitation light emitted from the light diffusion unit has a wavelength different from that of the excitation light. This is a part that converts the light into converted light and diffuses the excitation light and the wavelength-converted light therein.
- the light emitting surface is a part that emits the excitation light and the wavelength converted light after passing through the wavelength converting unit to the outside.
- the light emitter includes a light emitting region that is a region where the electroluminescent layer is located and a non-light emitting region that is a region where the electroluminescent layer is not located when viewed from a direction orthogonal to the light emitting surface. Yes.
- the light diffusing unit and the wavelength converting unit are provided so as to straddle the boundary between the light emitting region and the non-light emitting region when viewed from a direction orthogonal to the light emitting surface.
- the boundary between the light emitting region and the non-light emitting region is made inconspicuous, and the light emitted from the light emitting surface corresponding to the light emitting region is reduced. It is possible to suppress the difference between the color and the color of the light emitted from the light emission surface corresponding to the non-light emitting region.
- FIG. 5 It is a top view of the surface emitting module in embodiment of this invention. It is a schematic cross section of the surface emitting module shown in FIG. 5 is a graph showing a vertical in-plane light distribution part distribution according to first to fourth configuration examples of a light emitter provided in the surface light emitting module shown in FIG. 1. It is a schematic block diagram of the surface emitting module which concerns on the Example and Comparative Examples 1 and 2 which were verified in the verification test. It is the graph which showed the normalization front luminance profile in each interface of the surface emitting module concerning an example. 6 is a graph showing a normalized front luminance profile at each interface of a surface emitting module according to Comparative Example 1.
- FIG. 6 is a graph showing a normalized front luminance profile at each interface of a surface emitting module according to Comparative Example 2. It is a graph which shows the chromaticity of the light radiate
- FIG. It is a schematic block diagram of the surface emitting module which concerns on a 1st modification. It is a schematic block diagram of the surface emitting module which concerns on a 2nd modification. It is a schematic block diagram of the surface emitting module which concerns on a 3rd modification. It is a schematic block diagram of the surface emitting module which concerns on a 4th modification. It is a schematic block diagram of the surface emitting module which concerns on a 5th modification.
- FIG. 1 is a plan view of a surface emitting module according to an embodiment of the present invention
- FIG. 2 is a schematic cross-sectional view of the surface emitting module shown in FIG. 1 taken along line II-II in FIG.
- FIG. 3 is a graph showing a vertical in-plane light distribution part distribution according to first to fourth configuration examples of the light emitters provided in the surface light emitting module shown in FIG.
- the surface emitting module 1A in this Embodiment is demonstrated.
- the surface emitting module 1 ⁇ / b> A includes a transparent substrate 10, a light emitter 20, a light diffusion layer 30 as a light diffusion portion, and wavelength conversion as a wavelength conversion portion.
- the outer shape of the layer 40 is formed, for example, in a flat plate shape or a sheet shape having a predetermined thickness as shown in a plan view.
- the organic EL panel mainly composed of the transparent substrate 10 and the light emitter 20 is of a bottom emission type in which light is extracted to the outside via the transparent substrate 10.
- the transparent base material 10, the light emitter 20, the light diffusion layer 30, and the wavelength conversion layer 40 are laminated along the thickness direction of the surface light emitting module 1A.
- the transparent substrate 10 is made of a plate-like or sheet-like member, and the light emitter 20 is formed in a layer on one main surface of the transparent substrate 10.
- the light diffusion layer 30 is formed in a layered manner on the other main surface of the transparent substrate 10, and the wavelength conversion layer 40 is formed on the other main surface of the transparent substrate 10. It is formed in layers on top.
- the main surface located on the side opposite to the side where the light diffusion layer 30 is located constitutes the light emitting surface P of the surface emitting module 1A.
- the transparent substrate 10 is located between the light emitter 20 and the light diffusion layer 30 and has wiring portions 11 and 12 on the main surface located on the light emitter 20 side.
- the light emitter 20 has an element part 21, an insulating part 25, and a sealing part 26.
- the element unit 21 includes an anode (anode) 22, a cathode (cathode) 23, and an organic layer (electroluminescent layer) 24.
- the wiring portions 11 and 12 are patterned in a predetermined shape, and the anode 22, the organic layer 24, and the cathode 23 are sequentially laminated on the main surface of the transparent base material 10 on which the wiring portions 11 and 12 are formed.
- the light emitter 20 is formed.
- the anode 22 is connected to the wiring part 11, and the cathode 23 is connected to the wiring part 12.
- the transparent base material 10 is composed of an insulating member that transmits light well, and preferably a light transmissive film substrate such as polyethylene terephthalate (PET) resin or polycarbonate (PC) resin.
- a light transmissive film substrate such as polyethylene terephthalate (PET) resin or polycarbonate (PC) resin.
- PET polyethylene terephthalate
- PC polycarbonate
- PI polyimide
- PEN polyethylene naphthalate
- PS polystyrene
- PS polyethersulfone
- PP polypropylene
- the anode 22 is composed of, for example, a conductive film having transparency, and specifically, an ITO (mixture of indium oxide and tin oxide) film or IZO (mixture of indium oxide and zinc oxide film).
- a film, a ZnO film, or the like is formed by forming a film on the main surface of the transparent substrate 10 by a sputtering method or the like.
- examples of other materials used for the anode 22 include polyethylene dioxythiophene (PEDOT), a metal thin film made of Ag, Al, Ca, Cu, Au, or the like and having a thickness of 20 nm or less.
- the anode 22 may be formed of a thin metal wire with a size that does not completely cover the organic layer 24. In such a case, the sheet resistance of the anode 22 can be effectively reduced.
- the organic layer 24 is a portion that generates excitation light when a voltage is applied, and includes at least an electroluminescent layer made of a fluorescent compound or a phosphorescent compound.
- the organic layer 24 may be composed of a single-layer electroluminescent layer, or may be configured by sequentially stacking a hole transport layer, an electroluminescent layer, a hole blocking layer, an electron transport layer, and the like.
- a lithium fluoride film, an inorganic metal salt film, or the like may be formed at an arbitrary position in the thickness direction in the electroluminescent layer.
- the electroluminescent layer for example, a laminated film containing an organic material typified by Alq3 (tris (8-quinolinolato) aluminum) can be suitably used.
- an organic metal complex may be used from the viewpoint of improving the external quantum efficiency of the organic EL element and extending the light emission lifetime.
- the metal element involved in the formation of the complex is preferably any one metal belonging to Group VIII, Group IX, and Group X of the periodic table of elements, Al, Zn, and particularly Ir, Pt, Al, Zn is preferable.
- the organic layer 24 is provided on the anode 22 by adopting any one of, for example, a vapor deposition method, a spin coat method, a cast method, an ink jet method, and a printing method.
- a vapor deposition method for example, a vapor deposition method, a spin coat method, a cast method, an ink jet method, and a printing method.
- the spin coating method, the ink jet method, and the printing method can be suitably used because a homogeneous film is easily obtained and the generation of pinholes can be suppressed.
- the cathode 23 is made of, for example, a metal film having a high reflectivity, and is specifically formed by forming an aluminum (Al) film or the like so as to cover the organic layer 24 by a vacuum deposition method or the like.
- the cathode 23 is composed of a lithium fluoride (LiF) film, a laminated film of an Al film and a calcium (Ca) film, a laminated film of an Al film and a LiF film, a laminated film of an Al film and a barium (Ba) film, and the like. May be.
- the cathode 23 may be composed of a conductive oxide film or a metal thin film.
- An insulating portion 25 is provided between the anode 22 and the cathode 23 so that they are not short-circuited.
- the insulating portion 25 is formed by, for example, forming a SiO 2 film or the like using a sputtering method or the like and then patterning the SiO 2 film or the like into a predetermined shape using a photolithography method or the like.
- the sealing part 26 is comprised from the resin material or glass material which has insulation.
- the sealing portion 26 is for protecting the organic layer 24 from moisture and the like, and seals the entire element portion 21 including the anode 22, the organic layer 24, and the cathode 23 between the transparent substrate 10. It is formed as follows.
- a resin film made of PET resin, PEN resin, PS resin, PES resin, PI resin, etc. an inorganic thin film such as SiO 2 , Al 2 O 3 , SiN x , and flexible acrylic Those formed so as to have gas barrier properties by overlapping a plurality of resin thin films and the like in layers are used.
- the wiring parts 11 and 12 are preferably formed at the same time using the same material as the anode 22 described above.
- the wiring parts 11 and 12 may be further laminated with a metal film such as gold, silver, or copper.
- the wiring parts 11 and 12 are alternately arranged so as to surround the organic layer 24 along the periphery of the transparent substrate 10, and a power supply line (not shown) is attached to the predetermined position by soldering or the like, for example.
- the light emitting region A1 is a region where the organic layer 24 including the electroluminescent layer is located, and the non-light emitting region A2 is a region where the organic layer 24 is not located.
- the light emitting region A1 is configured by a substantially rectangular region located in the center of the surface light emitting module 1A when viewed from a direction orthogonal to the light emitting surface P, and the non-light emitting region A2 is a light emitting region.
- the frame P When viewed from the direction orthogonal to the plane P, the frame P is configured by a frame-shaped region along the outer periphery of the light emitting region A1.
- a boundary B between the light emitting region A1 and the non-light emitting region A2 is indicated by a broken line.
- the organic EL panel mainly composed of the transparent substrate 10 and the light emitter 20 those having the light distribution characteristics as in the first to fourth configuration examples shown in FIG. 3 can be suitably used.
- the organic EL panel according to the first configuration example has a Lambertian distribution that is a vertical in-plane light distribution exhibited by a normal organic EL panel, and the organic EL panels according to the second to fourth configuration examples It has a vertical in-plane light distribution different from the Lambertian distribution. Note that it is naturally possible to apply an organic EL panel having a vertical in-plane light distribution other than the first to fourth configuration examples described below to the surface emitting module 1A in the present embodiment.
- the organic EL panel according to the first configuration example draws a light distribution curve of light emitted from the light emitter 20 in a plane perpendicular to the main surface of the light emitter 20, the organic EL panel is in the normal direction of the main surface.
- a direction in which the front side luminance along the extending optical axis (that is, the luminance at ⁇ 0 ° shown in the figure) is 1, and the angle formed with the optical axis in the plane is ⁇
- the luminance of the light that is, the luminance in the range of ⁇ 90 ° ⁇ ⁇ 90 ° and ⁇ ⁇ 0 °
- L cos ⁇ .
- the organic EL panel according to the second to fourth configuration examples draws a light distribution curve in a plane perpendicular to the main surface of the light emitter 20, the main surface of the light emitted from the light emitter 20 is drawn.
- L is the luminance in the direction in which ⁇ is ⁇ (that is, the luminance in the range of ⁇ 90 ° ⁇ ⁇ 90 ° and ⁇ ⁇ 0 °)
- the light distribution curves all satisfy the condition of L> cos ⁇ . It contains parts.
- the condition of L> cos ⁇ is generally satisfied in the range of ⁇ 90 ° ⁇ ⁇ ⁇ 42 ° and 42 ° ⁇ ⁇ ⁇ 90 °.
- the condition of L> cos ⁇ is generally satisfied in the range of ⁇ 48 ° ⁇ ⁇ ⁇ 48 ° (where ⁇ ⁇ 0 °).
- the condition of L> cos ⁇ is generally satisfied in the range of ⁇ 90 ° ⁇ ⁇ 90 ° (where ⁇ ⁇ 0 °).
- the angle dependency of the light emitted from the main surface is the normal Lambertian distribution (the organic configuration according to the first configuration example). This means that the amount of light emitted toward the oblique direction on the front side is the amount of light emitted toward the front direction. Means more.
- the organic EL panels according to the second to fourth configuration examples having the vertical in-plane light distribution as described above can be realized by adjusting the thickness of the hole transport layer, for example. That is, an ITO film is used as a transparent electrode layer, an MgAg film is used as an electron transport layer, an Alq3 film is used as a light emitting layer, an ⁇ -NPD film is used as a hole transport layer, and an Ag film is used as a cathode.
- the thickness of the transparent electrode layer / electron transport layer / light emitting layer is 150 nm / 50 nm / 20 nm, and the thickness of the hole transport layer is 20 nm or less, the vertical in-plane arrangement as in the first configuration example is obtained.
- a light distribution (that is, a Lambertian distribution) is obtained, and if the thickness of the hole transport layer is 25 nm, a vertical in-plane light distribution as in the second configuration example is obtained. If the thickness of the hole transport layer is 75 nm, a vertical in-plane light distribution as in the third configuration example is obtained. If the thickness of the hole transport layer is 100 nm, as in the fourth configuration example. Vertical alignment So that the distribution can be obtained.
- the organic EL panels according to the first to fourth configuration examples can be preferably used, but particularly preferably,
- the organic EL panels according to the second to fourth configuration examples in which the amount of light emitted in the oblique direction on the front side is larger than the amount of light emitted in the front direction include the light emitting region A1 and the non-light emitting region. This can be said to be more preferable in that the boundary B with A2 can be more blurred. The reason will be described later.
- the light diffusion layer 30 is composed of a film having a function of diffusing and transmitting the wavelength of the excitation light emitted from the light emitter 20 without converting it.
- the light diffusing layer 30 includes a binder 31 and diffusing fine particles 32 to diffuse light using an internal scattering action (see FIG. 4A).
- a spray method, a vapor deposition method, and a spin coat method Any one of a casting method, an ink jet method, a printing method, and the like is employed on the transparent substrate 10.
- a polymethyl methacrylate (PMMA) resin mixed with TiO 2 fine particles can be used, and as the diffusion fine particles 32, PMMA resin fine particles, hollow silica, or the like can be used.
- the light diffusion layer 30 is provided so as to straddle the boundary B between the light emitting region A1 and the non-light emitting region A2 when viewed from the direction orthogonal to the light emitting surface P. More specifically, the light diffusion layer 30 is provided so as to cover the entire main surface located on the opposite side of the transparent substrate 10 from the side where the light emitter 20 is located.
- the diffusion fine particles 32 spherical isotropic diffusion fine particles may be used, but non-spherical anisotropic diffusion fine particles may be used.
- non-spherical anisotropic diffusion fine particle the light traveling in the direction perpendicular to the light exit surface of the light diffusion layer 30 is difficult to diffuse and the light traveling in the direction parallel to the light exit surface is not.
- the anisotropic particles are preferably arranged so that the longitudinal direction of the anisotropic particles faces a direction substantially parallel to the light exit surface. As a result, light is efficiently diffused and more light can be extracted from the light diffusion layer 30.
- the effect of blurring the boundary B between the light emitting area A1 and the non-light emitting area A2 and making it inconspicuous is enhanced.
- the wavelength conversion layer 40 converts part of the excitation light emitted from the light emitter 20 into wavelength conversion light having a wavelength different from that of the excitation light, and diffuses and transmits the excitation light and the wavelength conversion light therein. It is comprised with the film
- the wavelength conversion layer 40 includes a binder 41 and wavelength conversion fine particles 42 (see FIG. 4A). For example, any one of a spray method, a vapor deposition method, a spin coating method, a cast method, an ink jet method, a printing method, and the like. Is provided on the light diffusion layer 30.
- binder 41 for example, trisiloxane or the like can be used, and as the wavelength conversion fine particle 42, for example, Y 3 Al 5 O 12 : Ce or the like can be used.
- the wavelength conversion layer 40 is provided so as to straddle the boundary B between the light emitting region A1 and the non-light emitting region A2 when viewed from the direction orthogonal to the light emitting surface P. More specifically, the wavelength conversion layer 40 is provided so as to cover the entire main surface of the light diffusion layer 30.
- the organic layer 24 including the electroluminescent layer emits light when a voltage is applied by the anode 22 and the cathode 23, and the excitation light generated in the organic layer 24 is reflected as it is or reflected by the cathode 23 to be the anode. 22 and the transparent substrate 10 are transmitted.
- the excitation light emitted from the transparent substrate 10 is diffused without being wavelength-converted in the light diffusion layer 30 and passes through the light diffusion layer 30.
- a part of the excitation light emitted from the light diffusion layer 30 is wavelength-converted in the wavelength conversion layer 40 to become wavelength-converted light.
- the wavelength conversion layer 40 the excitation light and the wavelength-converted light are diffused, and the wavelength conversion layer. 40 is transmitted. Thereby, the excitation light and the wavelength converted light after passing through the wavelength conversion layer 40 are emitted outward from the light emitting surface P of the surface emitting module 1A.
- the light diffusing layer 30 and the wavelength conversion layer 40 are provided so as to straddle the boundary B between the light emitting region A1 and the non-light emitting region A2.
- the apparent light emitting area in P is expanded, and the boundary B between the light emitting area A1 and the non-light emitting area A2 is blurred, which can be made inconspicuous.
- the organic EL panels according to the second to fourth configuration examples described above are used, the light traveling in the oblique direction can be made larger than the light traveling in the other direction.
- the boundary B between the light emitting area A1 and the non-light emitting area A2 becomes more blurred, and the boundary B can be made much less noticeable.
- the light emitter 20, the light diffusion layer 30, and the wavelength conversion layer 40 are arranged in this order along the light traveling direction.
- the light incident on the conversion layer 40 becomes excitation light after being diffused by the light diffusion layer 30. Therefore, when the excitation light reaches the wavelength conversion layer 40, the luminance distribution of the excitation light becomes considerably smooth when viewed from the light exit surface P side.
- the mechanism will be described in detail while comparing Examples to which the present invention is applied with Comparative Examples 1 and 2 to which the present invention is not applied.
- FIG. 4A is a schematic configuration diagram of the surface emitting module according to the example verified in the verification test.
- FIGS. 4B and 4C are Comparative Examples 1 and 2 verified in the verification test, respectively. It is a schematic block diagram of the surface emitting module which concerns on.
- FIG. 5 is a graph showing a normalized front luminance profile at each interface of the surface emitting module according to the example, and FIGS. 6 and 7 are interfaces of the surface emitting module according to Comparative Examples 1 and 2, respectively. It is the graph which showed the normalization front luminance profile in.
- the normalized front luminance profiles shown in FIGS. 5A to 5C are normalized front luminance profiles at arrows VA to VC shown in FIG. 4A, respectively.
- FIG. 6B are normalized front luminance profiles at arrows VIA and VIB shown in FIG. 4B, respectively, and are shown in FIG. 7A to FIG. 7C.
- the normalized front luminance profiles shown in Fig. 4 are normalized front luminance profiles at arrows VIIA to VIIC shown in Fig. 4C, respectively.
- the configuration of the light emitter 20 other than the organic layer 24 including the electroluminescent layer is shown only schematically for convenience.
- FIG. 4A a surface emitting module 1A having a configuration similar to the surface emitting module in the first embodiment described above is modeled, As Comparative Examples 1 and 2 to which the present invention is not applied, surface emitting modules 1X and 1Y as shown in FIGS. 4B and 4C are modeled, and the surface emitting modules 1A, 1X and 1Y are modeled.
- the normalized front luminance profile at each interface was calculated by simulation.
- the surface emitting module 1A which concerns on an Example is the order of the light-emitting body 20, the transparent base material 10, the light-diffusion layer 30, and the wavelength conversion layer 40 along the advancing direction of light. These are located.
- the surface emitting module 1X according to the comparative example 1 in the surface emitting module 1X according to the comparative example 1, these are positioned in the order of the light emitter 20, the transparent substrate 10, and the wavelength conversion layer 40 along the light traveling direction. It will be.
- the surface emitting module 1Y according to the comparative example 2 includes the light emitting body 20, the transparent substrate 10, the wavelength conversion layer 40, and the light diffusion layer 30 in this order along the light traveling direction. These are located.
- the normalized front luminance profile of the excitation light emitted from the transparent base material 10 is positioned with the organic layer 24 including the electroluminescent layer.
- the luminance is high within the range of the light emitting portion width W, which is a range, and has a luminance distribution with a steep change in which the luminance is almost zero in a range outside the light emitting portion width W.
- the normalized front luminance profile of the excitation light emitted from the light diffusion layer 30 has its luminance distribution as the excitation light is diffused in the light diffusion layer 30. Becomes considerably smoother.
- the normalized front luminance profile of the excitation light and the wavelength conversion light emitted from the wavelength conversion layer 40 that is, the light exit surface P
- the luminance distribution thereof becomes considerably smooth.
- the luminance difference ⁇ L1 (see FIG. 5C) between the excitation light and the wavelength converted light emitted from the predetermined position p1 (see FIG. 4A) of the light emitting region A1 and the non-light emitting region A2
- the difference between the luminance difference ⁇ L2 (see FIG. 5C) between the excitation light emitted from the predetermined position p2 (see FIG.
- the wavelength converted light is relatively small (in other words, the position the ratio of the excitation light component and the wavelength converted light component in the light emitted from p1 and the ratio of the excitation light component and the wavelength converted light component in the light emitted from position p2 are close to each other) It is possible to suppress a difference between the color of the light emitted from the light emission surface P corresponding to A1 and the color of the light emitted from the light emission surface P corresponding to the non-light emitting region A2.
- the normalized front surface of the excitation light emitted from the transparent substrate 10 is used.
- the luminance profile is a sharp change in which the luminance is high within the range of the light emitting portion width W, which is the range where the organic layer 24 including the electroluminescent layer is located, and the luminance is substantially 0 in the range outside the light emitting portion width W. It has a luminance distribution accompanied by.
- the surface emitting module 1X according to Comparative Example 1 since the excitation light emitted from the transparent substrate 10 reaches the wavelength conversion layer 40 next, the light incident on the wavelength conversion layer 40 is The luminance distribution is not considerably smooth, but has a luminance distribution with the above-described steep change.
- the normalized front luminance profile of the excitation light and the wavelength conversion light emitted from the wavelength conversion layer 40 that is, the light emission surface P
- the excitation light has a sufficient diffusion effect. It is not obtained, and partly has a luminance distribution with a steep change.
- the luminance difference ⁇ L1 (see FIG. 6B) between the excitation light and the wavelength converted light emitted from the predetermined position p1 (see FIG. 4B) of the light emitting region A1 and the non-light emitting region A2
- the difference between the luminance difference ⁇ L2 (see FIG. 6B) between the excitation light emitted from the predetermined position p2 (see FIG. 4B) and the wavelength converted light becomes relatively large (in other words, the position the ratio of the excitation light component and the wavelength converted light component in the light emitted from p1 and the ratio of the excitation light component and the wavelength converted light component in the light emitted from the position p2 are greatly different from each other).
- the normalized front surface of the excitation light emitted from the transparent substrate 10 is used.
- the luminance profile is a sharp change in which the luminance is high within the range of the light emitting portion width W, which is the range where the organic layer 24 including the electroluminescent layer is located, and the luminance is substantially 0 in the range outside the light emitting portion width W. It has a luminance distribution accompanied by.
- the excitation light emitted from the transparent substrate 10 reaches the wavelength conversion layer 40 next, similarly to the surface light emitting module 1X according to Comparative Example 1. Therefore, the light incident on the wavelength conversion layer 40 does not have a considerably smooth luminance distribution, but has a luminance distribution with the above-described steep change.
- the excitation light emitted from the wavelength conversion layer 40 and the normalized front luminance profile of the wavelength conversion light are diffused in the wavelength conversion layer 40 together with the excitation light and the wavelength conversion light.
- a sufficient diffusion effect is obtained for the wavelength-converted light and the luminance distribution becomes considerably smooth, whereas a sufficient diffusion effect is not obtained for the excitation light, and some A luminance distribution with a steep change will be obtained.
- the excitation light and the wavelength converted light emitted from the wavelength conversion layer 40 are further incident on the light diffusion layer 30, as shown in FIG. 7C.
- the normalized front luminance profile of the excitation light and the wavelength converted light emitted from the light diffusion layer 30 (that is, the light exit surface P) is diffused in the wavelength conversion layer 40 by diffusing both the excitation light and the wavelength converted light.
- the converted light a sufficient diffusion effect is obtained and the luminance distribution becomes considerably smooth.
- the excitation light a sufficient diffusion effect is still not obtained, and some of the changes are steep. It will have a luminance distribution accompanied by.
- the luminance difference ⁇ L1 (see FIG. 7C) between the excitation light and the wavelength converted light emitted from the predetermined position p1 (see FIG. 4C) of the light emitting region A1 and the non-light emitting region A2
- the difference between the luminance difference ⁇ L2 (see FIG. 7C) between the excitation light emitted from the predetermined position p2 (see FIG. 4C) and the wavelength converted light becomes relatively large (in other words, the position the ratio of the excitation light component and the wavelength converted light component in the light emitted from p1 and the ratio of the excitation light component and the wavelength converted light component in the light emitted from the position p2 are greatly different from each other).
- the surface emitting module 1A allows the color of light emitted from the light emitting surface P corresponding to the light emitting region A1 and the non-light emitting region A2 to be changed. It can suppress that a difference arises with the color of the light radiate
- the light diffusing action in the light diffusion layer 30 increases as the distance between the organic layer 24 including the electroluminescent layer and the light diffusion layer 30 (that is, the optical path length between them) increases. Therefore, by making the distance between the organic layer 24 and the light diffusion layer 30 larger than the distance between the light diffusion layer 30 and the wavelength conversion layer 40, the effect of suppressing the above-described color difference is enhanced. It will be.
- the light diffusivity of the light diffusion layer 30 in the portion corresponding to the non-light emitting region A2 is higher.
- the boundary B between the light-emitting area A1 and the non-light-emitting area A2 is made more blurred.
- the boundary B can be made less noticeable.
- Such a configuration can be realized by changing the concentration of the diffusing fine particles 32 to be contained for each part of the light diffusion layer 30.
- FIG. 8A is a graph showing the chromaticity of light emitted from the surface light emitting module according to the example
- FIG. 8B is a color of light emitted from the surface light emitting module according to Comparative Example 1. It is a graph which shows a degree.
- surface light emitting modules having configurations similar to those of the surface light emitting modules 1A and 1X according to the example and the comparative example 1 described above are actually manufactured as prototypes at the positions p1 and p2, respectively. The result of actual measurement of chromaticity will be described.
- a subassembly in which a light diffusion layer and a wavelength conversion layer were formed in this order on a base material was assembled by assembling so that the transparent base materials included in these subassemblies were in close contact with each other through matching oil.
- the surface emitting module 1A according to the actually manufactured example and the surface emitting module 1X according to the actually manufactured comparative example 1 all other conditions other than the above-described configuration are set to be the same, and the excitation light
- the wavelength was 475 nm, and the wavelength of the wavelength converted light was 560 nm.
- the difference between the chromaticity at the position p1 and the chromaticity at the position p2 in the surface light emitting module 1A according to the actually manufactured example is actually a prototype. It is understood that the surface light emitting module 1X according to Comparative Example 1 is significantly reduced from the difference between the chromaticity at the position p1 and the chromaticity at the position p2.
- the surface emitting module 1A in the present embodiment corresponds to the color of light emitted from the light emitting surface P of the portion corresponding to the light emitting area A1 and the non-light emitting area A2. It can be said that it has been confirmed experimentally that it is possible to suppress the occurrence of a difference in the color of the light emitted from the partial light exit surface P.
- the wavelength of the wavelength-converted light is not particularly limited and is arbitrary, and may be appropriately determined according to the relationship between the wavelength of the excitation light and the chromaticity of the light desired to be emitted from the surface emitting module. Moreover, what is necessary is just to determine suitably the chromaticity of the light radiate
- Modification 9 to 17 are schematic configuration diagrams of surface emitting modules according to first to ninth modifications based on the above-described embodiment, respectively.
- surface emitting modules 1B to 1J according to first to ninth modifications will be described with reference to FIGS.
- the surface emitting module 1B according to the first modified example is guided between the transparent base material 10 and the light diffusion layer 30 when compared with the surface emitting module 1A in the present embodiment described above.
- the only difference is that a light guide layer 50 as an optical part is provided.
- the light guide layer 50 is for securing a longer distance between the organic layer 24 including the electroluminescent layer and the light diffusion layer 30 and is preferably made of a material that absorbs less light.
- a resin sheet made of PMMA resin or the like is laminated on the transparent substrate 10.
- the boundary B between the light emitting region A1 and the non-light emitting region A2 can be made inconspicuous, It can suppress that the color difference mentioned above arises.
- the surface light emitting module 1 ⁇ / b> C according to the second modified example has a light diffusing layer 30 in which the light diffusing portions are formed in layers when compared with the surface light emitting module 1 ⁇ / b> A in the present embodiment described above.
- the light diffusing plate 30 ' is formed in a flat plate shape, and the wavelength conversion plate 40' is formed in a flat plate shape, not the wavelength conversion layer 40 in which the wavelength conversion portion is formed in a layer shape. It differs in that it is configured.
- fluorescent glass can be used as the wavelength conversion plate 40 ′.
- the transparent substrate 10 and the light diffusing plate 30 ′ are not necessarily in close contact with each other, and a gap 60 may be located between them as shown in the figure.
- the light diffusion plate 30 ′ and the wavelength conversion plate 40 ′ are not necessarily in close contact with each other, and a gap 60 may be positioned between them as shown in the figure.
- the boundary B between the light emitting region A1 and the non-light emitting region A2 can be made inconspicuous, It can suppress that the color difference mentioned above arises. Furthermore, when this configuration is adopted, the organic EL panel, the light diffusing unit, and the wavelength converting unit can be manufactured as separate parts, which facilitates manufacturing and also provides an advantage of improving yield. .
- the surface light emitting module 1 ⁇ / b> D has a light diffusing layer 30 in which the light diffusing portions are formed in layers when compared with the surface light emitting module 1 ⁇ / b> A in the present embodiment described above.
- the wavelength conversion part is comprised by the wavelength conversion layer 40 formed in layers on the said light-diffusion plate 30'. It is different.
- the transparent substrate 10 and the light diffusing plate 30 ′ are not necessarily in close contact with each other, and a gap 60 may be positioned between them as shown in the figure.
- the boundary B between the light emitting region A1 and the non-light emitting region A2 can be made inconspicuous, It can suppress that the color difference mentioned above arises. Furthermore, when the configuration is adopted, the organic EL panel and the member including the light diffusing unit and the wavelength converting unit can be manufactured as separate parts, thereby facilitating manufacturing and improving the yield. Can also be obtained.
- the surface light emitting module 1E according to the fourth modified example has a wavelength conversion layer 40 in which the wavelength conversion portion is formed in a layer shape when compared with the surface light emitting module 1A in the present embodiment described above.
- the wavelength conversion board 40 ′ fluorescent glass can be used as the wavelength conversion plate 40 ′.
- the transparent base material 10 and the light diffusion layer 30 do not necessarily have to be in close contact with each other, and a gap 60 may be located between them as shown in the figure.
- the boundary B between the light emitting region A1 and the non-light emitting region A2 can be made inconspicuous, It can suppress that the color difference mentioned above arises. Furthermore, when the configuration is adopted, the organic EL panel and the member including the light diffusing unit and the wavelength converting unit can be manufactured as separate parts, thereby facilitating manufacturing and improving the yield. Can also be obtained.
- the surface light emitting module 1 ⁇ / b> F has a light diffusing layer 30 in which the light diffusing portions are formed in layers when compared with the surface light emitting module 1 ⁇ / b> A in the present embodiment described above.
- the light diffuser 30 ' is formed in a flat plate shape, and the light emitter 20 is formed in a layer on the light diffuser plate 30', thereby eliminating the use of the transparent substrate 10. It is different in the point that is done.
- the wavelength conversion part is comprised with wavelength conversion board 40 'formed in flat form instead of the wavelength conversion layer 40 formed in layer form.
- the wavelength conversion plate 40 ′ fluorescent glass can be used.
- the light diffusion plate 30 ′ and the wavelength conversion plate 40 ′ do not necessarily need to be in close contact with each other, and a gap 60 may be located between them as shown in the figure.
- the boundary B between the light emitting region A1 and the non-light emitting region A2 can be made inconspicuous, It can suppress that the color difference mentioned above arises.
- the transparent substrate 10 can be eliminated while the member including the light diffusing plate 30 ′ and the light emitter 20 and the wavelength conversion plate 40 ′ can be manufactured as separate parts. The advantage is that the number of parts can be reduced and manufacturing can be facilitated.
- the surface light emitting module 1 ⁇ / b> G has a light diffusing layer 30 in which the light diffusing portion is formed in a layer shape when compared with the surface light emitting module 1 ⁇ / b> A in the present embodiment described above.
- the light diffuser 30 ' is formed in a flat plate shape, and the light emitter 20 is formed in a layer on the light diffuser plate 30', thereby eliminating the use of the transparent substrate 10. It is different in the point that is done.
- the wavelength conversion part is comprised by the wavelength conversion layer 40 formed in layers on light diffusing plate 30 '.
- the boundary B between the light emitting region A1 and the non-light emitting region A2 can be made inconspicuous, It can suppress that the color difference mentioned above arises. Furthermore, when the said structure is employ
- the surface light emitting module 1H according to the seventh modification has a wavelength conversion layer 40 in which the wavelength conversion portion is formed in a layer shape when compared with the surface light emitting module 1A in the present embodiment described above.
- the light diffusing part is composed of a light diffusing layer 30 formed in a layer on the wavelength converting plate 40 ′, and is composed of a wavelength converting plate 40 ′ formed in a flat plate shape. Is different in that the light-emitting body 20 is formed in a layer shape on the light diffusion layer 30.
- the wavelength conversion plate 40 ′ fluorescent glass can be used as the wavelength conversion plate 40 ′.
- the boundary B between the light emitting region A1 and the non-light emitting region A2 can be made inconspicuous, It can suppress that the color difference mentioned above arises. Furthermore, when the said structure is employ
- the surface emitting module 1I according to the eighth modified example is an organic structure mainly composed of the base material 10 ′ and the light emitter 20 when compared with the surface emitting module 1A in the present embodiment described above.
- the EL panel is different in that it is of a top emission type in which light is extracted outside without passing through the base material 10 '.
- the base material 10 ′ is located on the side opposite to the side where the light diffusion layer 30 is located when viewed from the light emitter 20, it is not necessary to be transparent.
- the boundary B between the light emitting region A1 and the non-light emitting region A2 can be made inconspicuous, It can suppress that the color difference mentioned above arises.
- the surface emitting module 1J according to the ninth modification further includes an additional light diffusing plate 70 as an additional light diffusing portion when compared with the surface emitting module 1A in the present embodiment described above. Is different.
- the additional light diffusion plate 70 is located on the side opposite to the side where the light diffusion layer 30 is located when viewed from the wavelength conversion layer 40.
- the additional light diffusing plate 70 is constituted by a plate-like member including, for example, a binder 71 and diffusing fine particles 72, and further diffuses excitation light and wavelength converted light emitted from the wavelength conversion layer 40. It is.
- the boundary B between the light emitting region A1 and the non-light emitting region A2 can be made inconspicuous, The above-described color difference can be prevented from occurring, and further, these effects can be further enhanced by the action of the additional light diffusion plate 70.
- the light diffusing portion and the additional light diffusing portion have been described by exemplifying those composed of a binder and diffusing fine particles, but the surface has irregularities. Thus, it is naturally possible to use a material that diffuses light by utilizing the interface reflection action.
- the present invention is applied to a surface emitting module configured to be able to emit white light toward the outside.
- the scope of application of the present invention is not limited to this, and the present invention can naturally be applied to a surface emitting module configured to emit light of a color other than white toward the outside.
- the present invention is applied to a surface emitting module including an organic EL panel including an organic electroluminescent layer as an electroluminescent layer is exemplified.
- the scope of application of the present invention is not limited to this, and it is naturally possible to apply the present invention to a surface emitting module including an inorganic EL panel having an inorganic electroluminescent layer as an electroluminescent layer.
- the case where desired light distribution characteristics are obtained by adjusting the thickness of the hole transport layer of the organic EL panel is exemplified.
- the method for obtaining the light distribution characteristics is not limited to this, and other methods such as changing the film configuration of the organic EL panel can naturally be applied.
- the desired light distribution characteristic as mentioned above can be acquired by variously adjusting the structure of the said light source.
- the surface emitting module described above is summarized as follows.
- the surface light emitting module includes a light emitter, a light diffusing unit, a wavelength converting unit, and a light emitting surface.
- the luminous body includes an electroluminescent layer that emits excitation light when a voltage is applied thereto.
- the light diffusion part is a part that diffuses the excitation light without converting the wavelength of the excitation light emitted from the light emitter.
- the wavelength conversion unit is located on a side opposite to the side where the light emitter is located when viewed from the light diffusion unit, and a part of the excitation light emitted from the light diffusion unit has a wavelength different from that of the excitation light.
- the light emitting surface is a part that emits the excitation light and the wavelength converted light after passing through the wavelength converting unit to the outside.
- the light emitter includes a light emitting region that is a region where the electroluminescent layer is located and a non-light emitting region that is a region where the electroluminescent layer is not located when viewed from a direction orthogonal to the light emitting surface. Yes.
- the light diffusing unit and the wavelength converting unit are provided so as to straddle the boundary between the light emitting region and the non-light emitting region when viewed from a direction orthogonal to the light emitting surface.
- the distance between the electroluminescent layer and the light diffusing part is larger than the distance between the light diffusing part and the wavelength converting part.
- the surface light emitting module may further include a transparent base material for forming the light emitter in a layered form on one main surface thereof, in which case the transparent base material is the light emitter. And the light diffusion part.
- the said transparent base material and the said light-diffusion part may be closely_contact
- the light diffusing portion may be constituted by a light diffusing layer formed in a layer on the other main surface of the transparent base material.
- the wavelength conversion unit may be configured by a wavelength conversion layer formed in a layer shape on the light diffusion layer.
- the surface emitting module may further include a light guide unit positioned between the transparent base material and the light diffusion unit.
- the surface emitting module may further include a base material for forming the light emitter in a layered form on one main surface, in which case the base material is viewed from the light emitter.
- the light diffusing unit may be located on the opposite side of the side.
- the light diffusing portion may be configured by a light diffusing plate which is a flat plate member.
- the wavelength converting portion is the light diffusing plate. You may be comprised by the wavelength conversion layer formed in layer shape on the top.
- the light emitter may be formed in layers on the light diffusion plate.
- the light diffusing portion may be configured by a light diffusing plate which is a flat plate member.
- the light emitter is disposed on the light diffusing plate. It may be formed in layers.
- the said wavelength conversion part may be comprised with the wavelength conversion board which is a flat member, In that case, the said light-diffusion part is the said wavelength conversion board. You may comprise by the light-diffusion layer formed in the layer form on it.
- the light emitter may be formed in layers on the light diffusion layer.
- the surface emitting module is located on the side opposite to the side where the light diffusing unit is located when viewed from the wavelength converting unit, and further diffuses the excitation light and wavelength converted light emitted from the wavelength converting unit. You may provide the light-diffusion part.
- the surface emitting module when a light distribution curve of the excitation light emitted from the light emitter is drawn in a plane perpendicular to the main surface of the light emitter, the surface light emitting module extends in the normal direction of the main surface.
- the luminance on the front side along the existing optical axis is 1, and the luminance in the direction in which the angle formed with the optical axis in the plane is ⁇ is L, the light distribution curve is expressed as L> It is preferable to have at least a portion that satisfies the condition of cos ⁇ .
- 1A to 1J surface light emitting module 10 transparent substrate, 10 ′ substrate, 11, 12 wiring portion, 20 light emitter, 21 element portion, 22 anode, 23 cathode, 24 organic layer, 25 insulation portion, 26 sealing portion, 30 light diffusion layer, 30 'light diffusion plate, 31 binder, 32 diffusion fine particles, 40 wavelength conversion layer, 40' wavelength conversion plate, 41 binder, 42 wavelength conversion fine particles, 50 light guide layer, 60 gap, 70 additional light diffusion plate , 71 binder, 72 diffusing fine particles, A1 light emitting area, A2 non-light emitting area, B boundary, P light emitting surface.
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Abstract
A surface light-emitting module (1A) is provided with: a light-emitting body (20) that includes an electroluminescent layer (26) for emitting excitation light; a light-diffusing part (30) for scattering the excitation light without changing the wavelength of the excitation light; and a wavelength conversion unit (40) for converting a part of the excitation light into wavelength-converted light having a wavelength that is different from that of the excitation light, and scattering the excitation light and the wavelength-converted light in the interior thereof. The wavelength conversion unit (40) is provided on the opposite side from the side where the light-emitting body (20) is positioned, as viewed from the light-diffusing part (30). The light-emitting body (20) includes a light-emitting region (A1) and a non-light-emitting region (A2), the light-diffusing part (30) and the wavelength conversion unit (40) being provided so as to straddle the boundary (B) between the light-emitting region (A1) and the non-light-emitting region (A2).
Description
本発明は、面発光モジュールに関し、特に、電界発光層にて発光した励起光の一部を波長変換層にて波長変換することで励起光と波長変換光とを混ぜ合わせて所望の色の光を実現する、いわゆる色変換方式の面発光モジュールに関する。
The present invention relates to a surface emitting module, and in particular, a part of excitation light emitted from an electroluminescent layer is wavelength-converted by a wavelength conversion layer, thereby mixing the excitation light and the wavelength-converted light to obtain light of a desired color. The present invention relates to a so-called color conversion type surface emitting module.
近年、照明分野において、たとえば有機電界発光素子(以下、有機EL(Electro Luminescence)素子と称する)に代表される面発光光源を具備した面発光モジュールが注目されている。有機EL素子は、低消費電力で高い輝度を得ることができるものであり、応答性等においても優れた性能を発揮する。また、有機EL素子を含む面発光パネル(いわゆる有機ELパネル)は、軽量でかつ柔軟に曲げることもできるため、様々な形態の照明装置を構成できる点においても優位である。
In recent years, in the field of lighting, for example, a surface emitting module provided with a surface emitting light source represented by an organic electroluminescent element (hereinafter referred to as an organic EL (Electro Luminescence) element) has attracted attention. The organic EL element can obtain high luminance with low power consumption, and exhibits excellent performance in response and the like. In addition, a surface light-emitting panel including an organic EL element (so-called organic EL panel) is lightweight and can be bent flexibly, which is advantageous in that various types of lighting devices can be configured.
一般的に、照明光色としては、白色が望まれる場合が多い。有機EL素子の白色化技術としては、電界発光層に発光波長の異なるドーパントを2種以上含ませる手法や、異なる発光波長の電界発光層を2層以上積層する手法がある。しかしながら、これら手法を用いた場合には、ドーパントの種類が増加することで成膜プロセスが複雑化したり、発光層が増えることで歩留りが低下したりするため、製造の面での課題が多い。
Generally, white is often desired as the illumination light color. As a whitening technique of the organic EL element, there are a method in which two or more kinds of dopants having different emission wavelengths are included in the electroluminescent layer, and a method in which two or more electroluminescent layers having different emission wavelengths are stacked. However, when these methods are used, the number of dopants increases, which complicates the film forming process, and the number of light-emitting layers increases, resulting in a decrease in yield. Therefore, there are many problems in manufacturing.
一方、有機EL素子の白色化技術の他のものとして、色変換方式を利用したものが知られている。色変換方式を利用した白色化技術は、電界発光層の内部または外部に蛍光発光物質または燐光発光物質を含む波長変換層を設け、電界発光層にて発光した励起光の一部を波長変換層にて波長変換することで励起光と波長変換光とを混ぜ合わせて疑似白色の光を得るものである。当該色変換方式を採用した場合には、基本的な構成の有機EL素子に波長変換層を追加するのみで足りるため、製造の面での課題が少なく、比較的容易にかつ歩留りよく製造できるメリットが得られる。
On the other hand, as another technology for whitening an organic EL element, one using a color conversion method is known. The whitening technology using the color conversion method is provided with a wavelength conversion layer containing a fluorescent or phosphorescent substance inside or outside the electroluminescent layer, and a part of the excitation light emitted from the electroluminescent layer is converted into the wavelength converting layer. In this case, the excitation light and the wavelength converted light are mixed to obtain pseudo white light. When this color conversion method is adopted, it is only necessary to add a wavelength conversion layer to the organic EL element with the basic configuration, so there are few problems in terms of manufacturing, and it is possible to manufacture relatively easily and with high yield. Is obtained.
ところで、有機ELパネルは、その光出射面側からこれを見た場合に、発光領域と、当該発光領域の外周に沿って位置する非発光領域とを有している。これは、有機EL素子の信頼性を確保するために電界発光層を封止することが必要であるためであり、電界発光層を含む有機EL素子が透明基材上において封止層にて封止されることにより、有機ELパネルの周囲に電界発光層が存しない領域が位置することになるためである。そのため、何ら対策を施していない場合には、発光領域と非発光領域との境界が目立った状態となってしまう問題が生じる。
By the way, the organic EL panel has a light emitting region and a non-light emitting region located along the outer periphery of the light emitting region when viewed from the light emitting surface side. This is because it is necessary to seal the electroluminescent layer in order to ensure the reliability of the organic EL element, and the organic EL element including the electroluminescent layer is sealed with the sealing layer on the transparent substrate. This is because a region where the electroluminescent layer does not exist is located around the organic EL panel by being stopped. Therefore, if no countermeasure is taken, there arises a problem that the boundary between the light emitting region and the non-light emitting region becomes conspicuous.
これを防止する方法としては、面発光モジュールの光出射面側の位置に光を拡散させるための拡散板を設ける方法や、電界発光層から透明基材へ入射する光の配光を調整し、斜め方向に向かう光を他の方向に向かう光よりも多くする方法等が考えられる。これら方法を採用することにより、光出射面における見掛け上の発光領域が拡張されることになり、発光領域と非発光領域との境界がぼやけることでこれを目立たなくすることができる。
As a method for preventing this, a method of providing a diffusion plate for diffusing light at a position on the light emitting surface side of the surface light emitting module, adjusting the light distribution of light incident on the transparent substrate from the electroluminescent layer, A method of increasing the light traveling in the oblique direction more than the light traveling in the other direction is conceivable. By adopting these methods, the apparent light emitting area on the light emitting surface is expanded, and the boundary between the light emitting area and the non-light emitting area is blurred, which can be made inconspicuous.
なお、これら方法が採用されるとともに、上述した色変換方式が採用されて疑似白色の光が得られるように構成された面発光モジュールとしては、たとえば特開2004-311153号公報(特許文献1)に開示のものがある。
In addition, as a surface emitting module configured such that these methods are employed and the above-described color conversion method is employed to obtain pseudo white light, for example, Japanese Patent Application Laid-Open No. 2004-311153 (Patent Document 1). Are disclosed.
しかしながら、上述した特開2004-311153号公報に開示の如くの面発光モジュールとした場合には、発光領域に対応する部分の光出射面から出射された光の色と、非発光領域(すなわち、上述した見掛け上拡張された発光領域)に対応する部分の光出射面から出射された光の色との間に差が生じてしまう現象が発生する。当該現象は、以下の理由によって起こるものである。
However, in the case of a surface light emitting module as disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2004-311153, the color of light emitted from the light emitting surface of the portion corresponding to the light emitting region and the non-light emitting region (that is, A phenomenon occurs in which a difference occurs between the color of light emitted from the light emission surface of the portion corresponding to the above-described apparently extended light emission region). This phenomenon occurs for the following reason.
上述したように、波長変換層は、蛍光発光物質または燐光発光物質をその内部に含んでおり、これら蛍光発光物質または燐光発光物質は、バインダー中において分散配置された微粒子の状態で存在する。そのため、波長変換層は、入射した光の一部を波長変換する作用のみならず、入射した光の一部を拡散させる作用も有している。その結果、電界発光層にて発光し、波長変換層を経由して外部に出射される光には、次の3つの成分が含まれることになる。
As described above, the wavelength conversion layer contains a fluorescent light-emitting substance or a phosphorescent light-emitting substance therein, and these fluorescent light-emitting substance or phosphorescent light-emitting substance exists in the state of fine particles dispersedly arranged in the binder. Therefore, the wavelength conversion layer has not only an effect of converting the wavelength of a part of incident light but also an effect of diffusing a part of incident light. As a result, the light emitted from the electroluminescent layer and emitted to the outside via the wavelength conversion layer contains the following three components.
第1の成分は、波長変換層にて波長変換されることなくそのまま波長変換層を透過した成分である。第2の成分は、波長変換層にて波長変換されるとともに拡散された成分である。第3の成分は、波長変換層にて波長変換されずに拡散のみされた成分である。すなわち、第1の成分および第3の成分は、励起光そのものであり、第2の成分は、励起光が波長変換された後の波長変換光である。
The first component is a component that is directly transmitted through the wavelength conversion layer without being wavelength-converted by the wavelength conversion layer. The second component is a component that is wavelength-converted and diffused in the wavelength conversion layer. The third component is a component that is only diffused without being wavelength-converted in the wavelength conversion layer. That is, the first component and the third component are excitation light itself, and the second component is wavelength converted light after wavelength conversion of the excitation light.
ここで、第2および第3の成分は、波長変換層にて拡散される光であるため、電界発光層から波長変換層までの光路長が長くなるに従い、光出射面側から見た場合にその輝度分布が滑らかになるものである。これに対して、第1の成分は、波長変換層にて拡散されない光であるため、光出射面側から見た場合にその輝度分布が急峻な変化を有するものになる。
Here, since the second and third components are light diffused in the wavelength conversion layer, when the optical path length from the electroluminescent layer to the wavelength conversion layer becomes longer, when viewed from the light emitting surface side. The luminance distribution becomes smooth. On the other hand, since the first component is light that is not diffused by the wavelength conversion layer, the luminance distribution has a steep change when viewed from the light exit surface side.
したがって、発光領域に対応する部分の光出射面から出射された光には、励起光である第1および第3の成分と、波長変換光である第2の成分とが所定の割合で含まれるのに対し、非発光領域に対応する部分の光出射面から出射された光には、励起光である第1の成分が殆ど含まれず、波長変換光である第2の成分と励起光である第3の成分とが多く含まれることになる。
Therefore, the light emitted from the light emission surface of the portion corresponding to the light emitting region includes the first and third components that are excitation light and the second component that is wavelength converted light at a predetermined ratio. On the other hand, the light emitted from the light emitting surface of the portion corresponding to the non-light emitting region hardly contains the first component that is the excitation light, and is the second component that is the wavelength converted light and the excitation light. A large amount of the third component is contained.
そのため、結果として光出射面から出射される励起光の輝度分布と波長変換光の輝度部分布とに差が生じることになり、これが色の違いとなって現れることになる。特に、電界発光層から波長変換層までの光路長が長い場合や、波長変換層における光の拡散の度合いが小さい場合、電界発光層から波長変換層への光伝播の配光が斜め方向において顕著に強い場合等には、この色の差が非常に大きくなってしまう。
Therefore, as a result, a difference occurs between the luminance distribution of the excitation light emitted from the light emitting surface and the luminance portion distribution of the wavelength converted light, and this appears as a color difference. In particular, when the optical path length from the electroluminescent layer to the wavelength conversion layer is long, or when the degree of light diffusion in the wavelength conversion layer is small, the light distribution of light propagation from the electroluminescent layer to the wavelength conversion layer is remarkable in the oblique direction. When the color is strong, the color difference becomes very large.
したがって、本発明は、上述した問題点を解消すべくなされたものであり、色変換方式が採用された面発光モジュールにおいて、発光領域と非発光領域との境界を目立たなくさせつつ、これら発光領域に対応する部分の光出射面から出射される光の色および非発光領域に対応する部分の光出射面から出射される光の色に差が生じることを抑制することを目的とする。
Accordingly, the present invention has been made to solve the above-described problems, and in a surface light emitting module employing a color conversion method, these light emitting regions are made inconspicuous at the boundary between the light emitting region and the non-light emitting region. It is an object of the present invention to suppress the occurrence of a difference between the color of light emitted from the light emission surface of the portion corresponding to 1 and the color of light emitted from the light emission surface of the portion corresponding to the non-light emitting region.
本発明のある局面に従う面発光モジュールは、発光体と、光拡散部と、波長変換部と、光出射面とを備えている。上記発光体は、電圧が印加されることによって励起光を発光する電界発光層を含んでいる。上記光拡散部は、上記発光体から出射された励起光の波長を変換することなく励起光を拡散させる部位である。上記波長変換部は、上記光拡散部から見て上記発光体が位置する側とは反対側に位置し、上記光拡散部から出射された励起光の一部を励起光とは異なる波長の波長変換光に変換するとともに、その内部において励起光と波長変換光とを拡散させる部位である。上記光出射面は、上記波長変換部を通過した後の励起光および波長変換光を外部に向けて出射する部位である。上記発光体は、上記光出射面と直交する方向から見た場合に、上記電界発光層が位置する領域である発光領域と、上記電界発光層が位置しない領域である非発光領域とを含んでいる。上記光拡散部および上記波長変換部は、上記光出射面と直交する方向から見た場合に、上記発光領域と上記非発光領域との境界を跨ぐように設けられている。
A surface emitting module according to an aspect of the present invention includes a light emitter, a light diffusing unit, a wavelength converting unit, and a light emitting surface. The luminous body includes an electroluminescent layer that emits excitation light when a voltage is applied thereto. The light diffusion part is a part that diffuses the excitation light without converting the wavelength of the excitation light emitted from the light emitter. The wavelength conversion unit is located on a side opposite to the side where the light emitter is located when viewed from the light diffusion unit, and a part of the excitation light emitted from the light diffusion unit has a wavelength different from that of the excitation light. This is a part that converts the light into converted light and diffuses the excitation light and the wavelength-converted light therein. The light emitting surface is a part that emits the excitation light and the wavelength converted light after passing through the wavelength converting unit to the outside. The light emitter includes a light emitting region that is a region where the electroluminescent layer is located and a non-light emitting region that is a region where the electroluminescent layer is not located when viewed from a direction orthogonal to the light emitting surface. Yes. The light diffusing unit and the wavelength converting unit are provided so as to straddle the boundary between the light emitting region and the non-light emitting region when viewed from a direction orthogonal to the light emitting surface.
上記構成によれば、色変換方式が採用された面発光モジュールにおいて、発光領域と非発光領域との境界を目立たなくさせつつ、これら発光領域に対応する部分の光出射面から出射される光の色および非発光領域に対応する部分の光出射面から出射される光の色に差が生じることを抑制することができる。
According to the above configuration, in the surface emitting module adopting the color conversion method, the boundary between the light emitting region and the non-light emitting region is made inconspicuous, and the light emitted from the light emitting surface corresponding to the light emitting region is reduced. It is possible to suppress the difference between the color and the color of the light emitted from the light emission surface corresponding to the non-light emitting region.
以下、本発明の実施の形態について、図を参照して詳細に説明する。以下においては、本発明が適用された面発光モジュールとして、有機ELパネルを光源として備えることで外部に向けて白色の光が出射可能に構成された照明装置を例示して説明を行なう。なお、以下に示す実施の形態においては、同一のまたは共通する部分について図中同一の符号を付し、その説明は繰り返さない。
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, an explanation will be given by exemplifying a lighting device configured to emit white light toward the outside by providing an organic EL panel as a light source as a surface emitting module to which the present invention is applied. In the following embodiments, the same or common parts are denoted by the same reference numerals in the drawings, and description thereof will not be repeated.
図1は、本発明の実施の形態における面発光モジュールの平面図であり、図2は、図1に示す面発光モジュールの図1中に示すII-II線に沿った模式断面図である。また、図3は、図1に示す面発光モジュールに具備された発光体の第1ないし第4構成例に係る垂直面内配光部分布を示すグラフである。以下、これら図1ないし図3を参照して、本実施の形態における面発光モジュール1Aについて説明する。
FIG. 1 is a plan view of a surface emitting module according to an embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view of the surface emitting module shown in FIG. 1 taken along line II-II in FIG. FIG. 3 is a graph showing a vertical in-plane light distribution part distribution according to first to fourth configuration examples of the light emitters provided in the surface light emitting module shown in FIG. Hereinafter, with reference to these FIG. 1 thru | or FIG. 3, the surface emitting module 1A in this Embodiment is demonstrated.
図1および図2に示すように、本実施の形態における面発光モジュール1Aは、透明基材10と、発光体20と、光拡散部としての光拡散層30と、波長変換部としての波長変換層40とを備えており、その外形は、たとえば図示するような所定の厚みをもった平面視矩形状の平板状またはシート状の形状に形成されている。透明基材10および発光体20によって主として構成される有機ELパネルは、透明基材10を経由して光が外部に取り出されるボトムエミッション型のものである。
As shown in FIGS. 1 and 2, the surface emitting module 1 </ b> A according to the present embodiment includes a transparent substrate 10, a light emitter 20, a light diffusion layer 30 as a light diffusion portion, and wavelength conversion as a wavelength conversion portion. The outer shape of the layer 40 is formed, for example, in a flat plate shape or a sheet shape having a predetermined thickness as shown in a plan view. The organic EL panel mainly composed of the transparent substrate 10 and the light emitter 20 is of a bottom emission type in which light is extracted to the outside via the transparent substrate 10.
透明基材10、発光体20、光拡散層30および波長変換層40は、面発光モジュール1Aの厚み方向に沿って積層されている。透明基材10は、平板状またはシート状の部材からなり、発光体20は、透明基材10の一方の主表面上に層状に形成されている。また、光拡散層30は、透明基材10の他方の主表面上に層状に形成されており、波長変換層40は、透明基材10の他方の主表面上に形成された光拡散層30上に層状に形成されている。なお、波長変換層40の一対の主表面のうち、光拡散層30が位置する側とは反対側に位置する主表面が、面発光モジュール1Aの光出射面Pを構成している。
The transparent base material 10, the light emitter 20, the light diffusion layer 30, and the wavelength conversion layer 40 are laminated along the thickness direction of the surface light emitting module 1A. The transparent substrate 10 is made of a plate-like or sheet-like member, and the light emitter 20 is formed in a layer on one main surface of the transparent substrate 10. The light diffusion layer 30 is formed in a layered manner on the other main surface of the transparent substrate 10, and the wavelength conversion layer 40 is formed on the other main surface of the transparent substrate 10. It is formed in layers on top. Of the pair of main surfaces of the wavelength conversion layer 40, the main surface located on the side opposite to the side where the light diffusion layer 30 is located constitutes the light emitting surface P of the surface emitting module 1A.
透明基材10は、発光体20と光拡散層30との間に位置しており、発光体20側に位置する主表面上に配線部11,12を有している。発光体20は、素子部21と、絶縁部25と、封止部26とを有している。また、素子部21は、陽極(アノード)22と、陰極(カソード)23と、有機層(電界発光層)24とを含んでいる。
The transparent substrate 10 is located between the light emitter 20 and the light diffusion layer 30 and has wiring portions 11 and 12 on the main surface located on the light emitter 20 side. The light emitter 20 has an element part 21, an insulating part 25, and a sealing part 26. The element unit 21 includes an anode (anode) 22, a cathode (cathode) 23, and an organic layer (electroluminescent layer) 24.
配線部11,12は、所定形状にパターニングされており、当該配線部11,12が形成された透明基材10の主表面上に、陽極22、有機層24および陰極23が順次積層されることにより、発光体20が形成されている。このうち、陽極22は、配線部11に接続されており、陰極23は、配線部12に接続されている。
The wiring portions 11 and 12 are patterned in a predetermined shape, and the anode 22, the organic layer 24, and the cathode 23 are sequentially laminated on the main surface of the transparent base material 10 on which the wiring portions 11 and 12 are formed. Thus, the light emitter 20 is formed. Among these, the anode 22 is connected to the wiring part 11, and the cathode 23 is connected to the wiring part 12.
透明基材10は、光を良好に透過する絶縁性の部材にて構成され、好適にはポリエチレンテレフタレート(PET)樹脂またはポリカーボネイト(PC)樹脂等の光透過性のフィルム基板が用いられる。この他にも、光透過性のフィルム基板としては、ポリイミド(PI)樹脂、ポリエチレンナフタレート(PEN)樹脂、ポリスチレン(PS)樹脂、ポリエーテルサルフォン(PES)樹脂、ポリプロピレン(PP)樹脂等からなるものを用いてもよい。なお、透明基材10として各種ガラス基板を用いることとしてもよい。
The transparent base material 10 is composed of an insulating member that transmits light well, and preferably a light transmissive film substrate such as polyethylene terephthalate (PET) resin or polycarbonate (PC) resin. In addition to this, as a light transmissive film substrate, polyimide (PI) resin, polyethylene naphthalate (PEN) resin, polystyrene (PS) resin, polyethersulfone (PES) resin, polypropylene (PP) resin, etc. It may be used. Various glass substrates may be used as the transparent substrate 10.
陽極22は、たとえば透明性を有する導電膜にて構成され、具体的にはITO(インジウム酸化物と錫酸化物との混合体)膜やIZO(インジウム酸化物と亜鉛酸化膜との混合体)膜、ZnO膜等がスパッタリング法等によって透明基材10の主表面上に成膜されることで形成される。陽極22に用いられる他の材料としては、ポリエチレンジオキシチオフェン(PEDOT)や、Ag、Al、Ca、Cu、Au等からなる膜厚が20nm以下の金属薄膜等が挙げられる。また、陽極22を有機層24を完全には覆わない大きさで金属細線にて構成してもよく、そのように構成した場合には、陽極22のシート抵抗を効果的に下げることができる。
The anode 22 is composed of, for example, a conductive film having transparency, and specifically, an ITO (mixture of indium oxide and tin oxide) film or IZO (mixture of indium oxide and zinc oxide film). A film, a ZnO film, or the like is formed by forming a film on the main surface of the transparent substrate 10 by a sputtering method or the like. Examples of other materials used for the anode 22 include polyethylene dioxythiophene (PEDOT), a metal thin film made of Ag, Al, Ca, Cu, Au, or the like and having a thickness of 20 nm or less. Further, the anode 22 may be formed of a thin metal wire with a size that does not completely cover the organic layer 24. In such a case, the sheet resistance of the anode 22 can be effectively reduced.
有機層24は、電圧が印加されることによって励起光を発生する部位であり、少なくとも蛍光発光性化合物または燐光発光性化合物からなる電界発光層を含んでいる。有機層24は、単層の電界発光層から構成されていてもよく、正孔輸送層、電界発光層、正孔阻止層および電子輸送層などが順次積層されることによって構成されていてもよい。また、フッ化リチウム膜や無機金属塩膜等が、電界発光層中の厚み方向における任意の位置に形成されていてもよい。
The organic layer 24 is a portion that generates excitation light when a voltage is applied, and includes at least an electroluminescent layer made of a fluorescent compound or a phosphorescent compound. The organic layer 24 may be composed of a single-layer electroluminescent layer, or may be configured by sequentially stacking a hole transport layer, an electroluminescent layer, a hole blocking layer, an electron transport layer, and the like. . Further, a lithium fluoride film, an inorganic metal salt film, or the like may be formed at an arbitrary position in the thickness direction in the electroluminescent layer.
電界発光層としては、たとえばAlq3(トリス(8-キノリノラト)アルミニウム)に代表される有機材料を含む積層膜が好適に利用できる。電界発光層の材料としては、有機EL素子の外部量子効率の向上や発光寿命の長寿命化等の観点から、有機金属錯体を用いてもよい。ここで、錯体の形成に係る金属元素としては、元素周期表のVIII族、IX族およびX族に属するいずれか1種の金属またはAl、Znであることが好ましく、特にIrまたはPt、Al、Znであることが好ましい。
As the electroluminescent layer, for example, a laminated film containing an organic material typified by Alq3 (tris (8-quinolinolato) aluminum) can be suitably used. As a material for the electroluminescent layer, an organic metal complex may be used from the viewpoint of improving the external quantum efficiency of the organic EL element and extending the light emission lifetime. Here, the metal element involved in the formation of the complex is preferably any one metal belonging to Group VIII, Group IX, and Group X of the periodic table of elements, Al, Zn, and particularly Ir, Pt, Al, Zn is preferable.
有機層24は、たとえば蒸着法、スピンコート法、キャスト法、インクジェット法、印刷法等のいずれかが採用されることで陽極22上に設けられる。特に、スピンコート法、インクジェット法、印刷法は、均質な膜が得られ易くかつピンホールの発生が抑制できるため、好適に利用できる。
The organic layer 24 is provided on the anode 22 by adopting any one of, for example, a vapor deposition method, a spin coat method, a cast method, an ink jet method, and a printing method. In particular, the spin coating method, the ink jet method, and the printing method can be suitably used because a homogeneous film is easily obtained and the generation of pinholes can be suppressed.
陰極23は、たとえば高い反射率を有する金属膜にて構成され、具体的にはアルミニウム(Al)膜等が真空蒸着法等によって有機層24を覆うように成膜されることで形成される。陰極23は、フッ化リチウム(LiF)膜、Al膜およびカルシウム(Ca)膜の積層膜、Al膜およびLiF膜の積層膜、Al膜およびバリウム(Ba)膜の積層膜等にて構成されていてもよい。また、陰極23を導電性酸化膜または金属薄膜にて構成することとしてよい。
The cathode 23 is made of, for example, a metal film having a high reflectivity, and is specifically formed by forming an aluminum (Al) film or the like so as to cover the organic layer 24 by a vacuum deposition method or the like. The cathode 23 is composed of a lithium fluoride (LiF) film, a laminated film of an Al film and a calcium (Ca) film, a laminated film of an Al film and a LiF film, a laminated film of an Al film and a barium (Ba) film, and the like. May be. Further, the cathode 23 may be composed of a conductive oxide film or a metal thin film.
陽極22と陰極23との間には、これらが短絡しないように絶縁部25が設けられている。絶縁部25は、たとえばスパッタリング法等を用いてSiO2膜等が成膜された後、フォトリソグラフィ法等を用いて当該SiO2膜等が所定の形状にパターニングされることで形成される。
An insulating portion 25 is provided between the anode 22 and the cathode 23 so that they are not short-circuited. The insulating portion 25 is formed by, for example, forming a SiO 2 film or the like using a sputtering method or the like and then patterning the SiO 2 film or the like into a predetermined shape using a photolithography method or the like.
封止部26は、絶縁性を有する樹脂材料またはガラス材料などから構成される。封止部26は、有機層24を水分等から保護するためのものであり、陽極22、有機層24および陰極23からなる素子部21の略全体を透明基材10との間で封止するように形成されている。封止部26としては、PET樹脂、PEN樹脂、PS樹脂、PES樹脂、PI樹脂等からなる樹脂製フィルムと、SiO2、Al2O3、SiNx等の無機薄膜と、柔軟性のあるアクリル樹脂薄膜などとを層状に複数層重ね合わせることでガスバリア性を備えるように形成されたものが用いられる。
The sealing part 26 is comprised from the resin material or glass material which has insulation. The sealing portion 26 is for protecting the organic layer 24 from moisture and the like, and seals the entire element portion 21 including the anode 22, the organic layer 24, and the cathode 23 between the transparent substrate 10. It is formed as follows. As the sealing portion 26, a resin film made of PET resin, PEN resin, PS resin, PES resin, PI resin, etc., an inorganic thin film such as SiO 2 , Al 2 O 3 , SiN x , and flexible acrylic Those formed so as to have gas barrier properties by overlapping a plurality of resin thin films and the like in layers are used.
配線部11,12は、好適には上述した陽極22と同一の材料を用いて同時に形成される。なお、配線部11,12には、さらに金、銀、銅などの金属膜が積層されていてもよい。配線部11,12は、透明基材10の周囲に沿って有機層24を取り囲むように交互に配置され、図示しない給電線がその所定位置にたとえば半田付け等によって取付けられる。
The wiring parts 11 and 12 are preferably formed at the same time using the same material as the anode 22 described above. The wiring parts 11 and 12 may be further laminated with a metal film such as gold, silver, or copper. The wiring parts 11 and 12 are alternately arranged so as to surround the organic layer 24 along the periphery of the transparent substrate 10, and a power supply line (not shown) is attached to the predetermined position by soldering or the like, for example.
上述したように、透明基材10の主表面上に形成された素子部21が封止部26によって覆われることにより、発光体20は、光出射面Pと直交する方向から見た場合に、電界発光層を含む有機層24が位置する領域である発光領域A1と、当該有機層24が位置しない領域である非発光領域A2とを含むことになる。このうち、発光領域A1は、光出射面Pと直交する方向から見た場合に、面発光モジュール1Aの中央部に位置する略矩形状の領域にて構成され、非発光領域A2は、光出射面Pと直交する方向から見た場合に、発光領域A1の外周に沿った額縁状の領域にて構成される。なお、図1においては、これら発光領域A1と非発光領域A2との境界Bを破線にて示している。
As described above, when the element portion 21 formed on the main surface of the transparent substrate 10 is covered with the sealing portion 26, the light emitter 20 is viewed from the direction orthogonal to the light exit surface P. The light emitting region A1 is a region where the organic layer 24 including the electroluminescent layer is located, and the non-light emitting region A2 is a region where the organic layer 24 is not located. Of these, the light emitting region A1 is configured by a substantially rectangular region located in the center of the surface light emitting module 1A when viewed from a direction orthogonal to the light emitting surface P, and the non-light emitting region A2 is a light emitting region. When viewed from the direction orthogonal to the plane P, the frame P is configured by a frame-shaped region along the outer periphery of the light emitting region A1. In FIG. 1, a boundary B between the light emitting region A1 and the non-light emitting region A2 is indicated by a broken line.
ここで、透明基材10および発光体20によって主として構成される有機ELパネルとしては、図3に示す第1ないし第4構成例の如くの配光特性を有するものが好適に利用できる。第1構成例に係る有機ELパネルは、通常の有機ELパネルが呈する垂直面内配光分布であるランバーシャン分布を有するものであり、第2ないし第4構成例に係る有機ELパネルは、当該ランバーシャン分布とは異なる垂直面内配光分布を有するものである。なお、以下に示す第1ないし第4構成例以外の垂直面内配光分布を有する有機ELパネルを本実施の形態における面発光モジュール1Aに適用することも当然に可能である。
Here, as the organic EL panel mainly composed of the transparent substrate 10 and the light emitter 20, those having the light distribution characteristics as in the first to fourth configuration examples shown in FIG. 3 can be suitably used. The organic EL panel according to the first configuration example has a Lambertian distribution that is a vertical in-plane light distribution exhibited by a normal organic EL panel, and the organic EL panels according to the second to fourth configuration examples It has a vertical in-plane light distribution different from the Lambertian distribution. Note that it is naturally possible to apply an organic EL panel having a vertical in-plane light distribution other than the first to fourth configuration examples described below to the surface emitting module 1A in the present embodiment.
第1構成例に係る有機ELパネルは、発光体20から放射される光の、当該発光体20の主面と垂直な平面における配光曲線を描いた場合に、当該主面の法線方向に延在する光軸に沿った正面側の輝度(すなわち、図中に示すθ=0°における輝度)を1とし、当該平面内において上記光軸との間で形成される角がθである方向の輝度(すなわち、-90°<θ<90°であってθ≠0°の範囲における輝度)をLとすると、当該配光曲線が、L=cosθの条件を満たすものである。
When the organic EL panel according to the first configuration example draws a light distribution curve of light emitted from the light emitter 20 in a plane perpendicular to the main surface of the light emitter 20, the organic EL panel is in the normal direction of the main surface. A direction in which the front side luminance along the extending optical axis (that is, the luminance at θ = 0 ° shown in the figure) is 1, and the angle formed with the optical axis in the plane is θ If the luminance of the light (that is, the luminance in the range of −90 ° <θ <90 ° and θ ≠ 0 °) is L, the light distribution curve satisfies the condition of L = cos θ.
一方、第2ないし第4構成例に係る有機ELパネルは、発光体20から放射される光の、当該発光体20の主面と垂直な平面における配光曲線を描いた場合に、当該主面の法線方向に延在する光軸に沿った正面側の輝度(すなわち、図中に示すθ=0°における輝度)を1とし、当該平面内において上記光軸との間で形成される角がθである方向の輝度(すなわち、-90°<θ<90°であってθ≠0°の範囲における輝度)をLとすると、当該配光曲線が、いずれもL>cosθの条件を満たす部分を含んでいるものである。
On the other hand, when the organic EL panel according to the second to fourth configuration examples draws a light distribution curve in a plane perpendicular to the main surface of the light emitter 20, the main surface of the light emitted from the light emitter 20 is drawn. The angle formed between the optical axis in the plane and the luminance on the front side along the optical axis extending in the normal direction (ie, the luminance at θ = 0 ° shown in the figure) as 1. Where L is the luminance in the direction in which θ is θ (that is, the luminance in the range of −90 ° <θ <90 ° and θ ≠ 0 °), the light distribution curves all satisfy the condition of L> cos θ. It contains parts.
具体的には、第2構成例に係る有機ELパネルにあっては、概ね-90°<θ≦-42°および42°≦θ<90°の範囲においてL>cosθの条件が満たされており、第3構成例に係る有機ELパネルにあっては、概ね-48°≦θ≦48°(但し、θ≠0°)の範囲においてL>cosθの条件が満たされており、第4構成例に係る有機ELパネルにあっては、概ね-90°<θ<90°(但し、θ≠0°)の範囲においてL>cosθの条件が満たされている。
Specifically, in the organic EL panel according to the second configuration example, the condition of L> cos θ is generally satisfied in the range of −90 ° <θ ≦ −42 ° and 42 ° ≦ θ <90 °. In the organic EL panel according to the third configuration example, the condition of L> cos θ is generally satisfied in the range of −48 ° ≦ θ ≦ 48 ° (where θ ≠ 0 °). In the organic EL panel according to the above, the condition of L> cos θ is generally satisfied in the range of −90 ° <θ <90 ° (where θ ≠ 0 °).
上記第2ないし第4構成例に係る有機ELパネルが有する垂直面内配光分布は、上記主面から出射される光の角度依存性が、通常のランバーシャン分布(第1構成例に係る有機ELパネルが有する垂直面内配光分布)と異なっていることを意味しており、特に、正面側の斜め方向に向けて出射される光の量が正面方向に向けて出射される光の量よりも多いことを意味している。
In the vertical in-plane light distribution of the organic EL panels according to the second to fourth configuration examples, the angle dependency of the light emitted from the main surface is the normal Lambertian distribution (the organic configuration according to the first configuration example). This means that the amount of light emitted toward the oblique direction on the front side is the amount of light emitted toward the front direction. Means more.
上述した如くの垂直面内配光分布を有する上記第2ないし第4構成例に係る有機ELパネルは、たとえば正孔輸送層の厚みを調整することで実現が可能である。すなわち、透明電極層としてITO膜を用い、電子輸送層としてMgAg膜を利用し、発光層としてAlq3膜を用い、正孔輸送層としてα-NPD膜を用い、陰極としてAg膜を用い、このうちの透明電極層/電子輸送層/発光層の厚みをそれぞれ150nm/50nm/20nmとした場合において、正孔輸送層の厚みを20nm以下とすれば、概ね第1構成例の如くの垂直面内配光分布(すなわちランバーシャン分布)が得られることになり、当該正孔輸送層の厚みを25nmとすれば、第2構成例の如くの垂直面内配光分布が得られることになり、当該正孔輸送層の厚みを75nmとすれば、第3構成例の如くの垂直面内配光分布が得られることになり、当該正孔輸送層の厚みを100nmとすれば、第4構成例の如くの垂直面内配光分布が得られることになる。
The organic EL panels according to the second to fourth configuration examples having the vertical in-plane light distribution as described above can be realized by adjusting the thickness of the hole transport layer, for example. That is, an ITO film is used as a transparent electrode layer, an MgAg film is used as an electron transport layer, an Alq3 film is used as a light emitting layer, an α-NPD film is used as a hole transport layer, and an Ag film is used as a cathode. When the thickness of the transparent electrode layer / electron transport layer / light emitting layer is 150 nm / 50 nm / 20 nm, and the thickness of the hole transport layer is 20 nm or less, the vertical in-plane arrangement as in the first configuration example is obtained. A light distribution (that is, a Lambertian distribution) is obtained, and if the thickness of the hole transport layer is 25 nm, a vertical in-plane light distribution as in the second configuration example is obtained. If the thickness of the hole transport layer is 75 nm, a vertical in-plane light distribution as in the third configuration example is obtained. If the thickness of the hole transport layer is 100 nm, as in the fourth configuration example. Vertical alignment So that the distribution can be obtained.
本実施の形態における面発光モジュール1Aにおいては、これら第1ないし第4構成例に係る有機ELパネルの如くのいずれの配光特性を有するものも好適に利用可能であるが、特に好適には、正面側の斜め方向に向けて出射される光の量が正面方向に向けて出射される光の量よりも多い第2ないし第4構成例に係る有機ELパネルが、発光領域A1と非発光領域A2との境界Bをよりぼやけることが可能になる点でより好適なものと言える。なお、その理由については、後述することとする。
In the surface emitting module 1A in the present embodiment, those having any light distribution characteristic such as the organic EL panels according to the first to fourth configuration examples can be preferably used, but particularly preferably, The organic EL panels according to the second to fourth configuration examples in which the amount of light emitted in the oblique direction on the front side is larger than the amount of light emitted in the front direction include the light emitting region A1 and the non-light emitting region. This can be said to be more preferable in that the boundary B with A2 can be more blurred. The reason will be described later.
図1および図2に示すように、光拡散層30は、発光体20から出射された励起光の波長を変換することなく拡散させて透過する機能を有する膜にて構成されている。光拡散層30は、バインダー31と拡散微粒子32とを含むことで内部散乱作用を利用して光を拡散するものであり(図4(A)参照)、たとえばスプレー法、蒸着法、スピンコート法、キャスト法、インクジェット法、印刷法等のいずれかが採用されることで透明基材10上に設けられる。
As shown in FIGS. 1 and 2, the light diffusion layer 30 is composed of a film having a function of diffusing and transmitting the wavelength of the excitation light emitted from the light emitter 20 without converting it. The light diffusing layer 30 includes a binder 31 and diffusing fine particles 32 to diffuse light using an internal scattering action (see FIG. 4A). For example, a spray method, a vapor deposition method, and a spin coat method. Any one of a casting method, an ink jet method, a printing method, and the like is employed on the transparent substrate 10.
バインダー31としては、たとえばポリメタクリル酸メチル(PMMA)樹脂にTiO2微粒子を混ぜたもの等を利用することができ、拡散微粒子32としては、PMMA樹脂微粒子や中空シリカ等を利用することができる。
As the binder 31, for example, a polymethyl methacrylate (PMMA) resin mixed with TiO 2 fine particles can be used, and as the diffusion fine particles 32, PMMA resin fine particles, hollow silica, or the like can be used.
光拡散層30は、光出射面Pと直交する方向から見た場合に、発光領域A1と非発光領域A2との境界Bを跨ぐように設けられている。より具体的には、光拡散層30は、透明基材10の発光体20が位置する側とは反対側に位置する主表面の全面を覆うように設けられている。
The light diffusion layer 30 is provided so as to straddle the boundary B between the light emitting region A1 and the non-light emitting region A2 when viewed from the direction orthogonal to the light emitting surface P. More specifically, the light diffusion layer 30 is provided so as to cover the entire main surface located on the opposite side of the transparent substrate 10 from the side where the light emitter 20 is located.
ここで、拡散微粒子32としては、球形の等方性拡散微粒子を用いてもよいが、非球形の異方性拡散微粒子を用いてもよい。拡散微粒子32として非球形の異方性拡散微粒子を用いる場合には、光拡散層30の光出射面と垂直な方向に進む光が拡散し難くかつ当該光出射面と平行な方向に進む光が拡散し易いように、異方性粒子の長手方向が当該光出射面と略平行な方向を向くように配置することが好ましい。これにより、効率的に光が拡散されて光拡散層30からより多くの光を取り出すことが可能になる。また、斜め方向に進む光が拡散されて効率よく取り出せることにより、発光領域A1と非発光領域A2との境界Bをぼやけさせてこれを目立たなくする効果も高まることになる。
Here, as the diffusion fine particles 32, spherical isotropic diffusion fine particles may be used, but non-spherical anisotropic diffusion fine particles may be used. When a non-spherical anisotropic diffusion fine particle is used as the diffusion fine particle 32, the light traveling in the direction perpendicular to the light exit surface of the light diffusion layer 30 is difficult to diffuse and the light traveling in the direction parallel to the light exit surface is not. In order to facilitate diffusion, the anisotropic particles are preferably arranged so that the longitudinal direction of the anisotropic particles faces a direction substantially parallel to the light exit surface. As a result, light is efficiently diffused and more light can be extracted from the light diffusion layer 30. In addition, since the light traveling in the oblique direction is diffused and can be efficiently extracted, the effect of blurring the boundary B between the light emitting area A1 and the non-light emitting area A2 and making it inconspicuous is enhanced.
波長変換層40は、発光体20から出射された励起光の一部を当該励起光とは異なる波長の波長変換光に変換するとともに、その内部において励起光と波長変換光とを拡散させて透過する機能を有する膜にて構成されている。波長変換層40は、バインダー41と波長変換微粒子42とを含んでおり(図4(A)参照)、たとえばスプレー法、蒸着法、スピンコート法、キャスト法、インクジェット法、印刷法等のいずれかが採用されることで光拡散層30上に設けられる。
The wavelength conversion layer 40 converts part of the excitation light emitted from the light emitter 20 into wavelength conversion light having a wavelength different from that of the excitation light, and diffuses and transmits the excitation light and the wavelength conversion light therein. It is comprised with the film | membrane which has the function to do. The wavelength conversion layer 40 includes a binder 41 and wavelength conversion fine particles 42 (see FIG. 4A). For example, any one of a spray method, a vapor deposition method, a spin coating method, a cast method, an ink jet method, a printing method, and the like. Is provided on the light diffusion layer 30.
バインダー41としては、たとえばトリシロキサン等を利用することができ、波長変換微粒子42としては、たとえばY3Al5O12:Ce等を利用することができる。
As the binder 41, for example, trisiloxane or the like can be used, and as the wavelength conversion fine particle 42, for example, Y 3 Al 5 O 12 : Ce or the like can be used.
波長変換層40は、光出射面Pと直交する方向から見た場合に、発光領域A1と非発光領域A2との境界Bを跨ぐように設けられている。より具体的には、波長変換層40は、光拡散層30の主表面の全面を覆うように設けられている。
The wavelength conversion layer 40 is provided so as to straddle the boundary B between the light emitting region A1 and the non-light emitting region A2 when viewed from the direction orthogonal to the light emitting surface P. More specifically, the wavelength conversion layer 40 is provided so as to cover the entire main surface of the light diffusion layer 30.
以上のように構成された面発光モジュール1Aにおいては、外部の電源装置から、図示しない給電線、配線部11,12、陽極22および陰極23を通じて有機層24に電力が供給される。これにより、陽極22および陰極23によって電圧が印加されることで電界発光層を含む有機層24が発光し、有機層24にて生成された励起光は、そのままあるいは陰極23にて反射されて陽極22および透明基材10を透過する。
In the surface emitting module 1A configured as described above, electric power is supplied from an external power supply device to the organic layer 24 through a power supply line (not shown), the wiring portions 11 and 12, the anode 22 and the cathode 23. As a result, the organic layer 24 including the electroluminescent layer emits light when a voltage is applied by the anode 22 and the cathode 23, and the excitation light generated in the organic layer 24 is reflected as it is or reflected by the cathode 23 to be the anode. 22 and the transparent substrate 10 are transmitted.
透明基材10から出射された励起光は、光拡散層30において波長変換されることなく拡散されて光拡散層30を透過する。光拡散層30から出射された励起光は、波長変換層40においてその一部が波長変換されて波長変換光となり、当該波長変換層40において励起光と波長変換光とが拡散されて波長変換層40を透過する。これにより、波長変換層40を通過した後の励起光および波長変換光が、面発光モジュール1Aの光出射面Pから外部に向けて出射されることになる。
The excitation light emitted from the transparent substrate 10 is diffused without being wavelength-converted in the light diffusion layer 30 and passes through the light diffusion layer 30. A part of the excitation light emitted from the light diffusion layer 30 is wavelength-converted in the wavelength conversion layer 40 to become wavelength-converted light. In the wavelength conversion layer 40, the excitation light and the wavelength-converted light are diffused, and the wavelength conversion layer. 40 is transmitted. Thereby, the excitation light and the wavelength converted light after passing through the wavelength conversion layer 40 are emitted outward from the light emitting surface P of the surface emitting module 1A.
ここで、本実施の形態における面発光モジュール1Aにおいては、光拡散層30および波長変換層40が発光領域A1と非発光領域A2との境界Bを跨ぐように設けられているため、光出射面Pにおける見掛け上の発光領域が拡張されることになり、発光領域A1と非発光領域A2との境界Bがぼやけることでこれを目立たなくすることができる。なお、特に、上述した第2ないし第4構成例に係る有機ELパネルを用いた場合には、斜め方向に向かう光を他の方向に向かう光よりも多くすることができるため、この点においても発光領域A1と非発光領域A2との境界Bがよりぼやけることになり、当該境界Bをさらに大幅に目立たなくすることができる。
Here, in the surface emitting module 1A according to the present embodiment, the light diffusing layer 30 and the wavelength conversion layer 40 are provided so as to straddle the boundary B between the light emitting region A1 and the non-light emitting region A2. The apparent light emitting area in P is expanded, and the boundary B between the light emitting area A1 and the non-light emitting area A2 is blurred, which can be made inconspicuous. In particular, when the organic EL panels according to the second to fourth configuration examples described above are used, the light traveling in the oblique direction can be made larger than the light traveling in the other direction. The boundary B between the light emitting area A1 and the non-light emitting area A2 becomes more blurred, and the boundary B can be made much less noticeable.
また、本実施の形態における面発光モジュール1Aにおいては、上述したように、光の進行方向に沿って発光体20、光拡散層30および波長変換層40がこの順で配置されているため、波長変換層40に入射する光は、光拡散層30によって拡散された後の励起光となる。そのため、波長変換層40に励起光が到達する時点において、当該励起光は、光出射面P側から見た場合にその輝度分布が相当程度に滑らかになったものとなる。これに基づき、本実施の形態における面発光モジュール1Aにおいては、発光領域A1に対応する部分の光出射面Pから出射される光の色と、非発光領域A2に対応する部分の光出射面Pから出射される光の色とに差が生じることが抑制できる。以下、そのメカニズムについて、本発明が適用された実施例と、本発明が適用されていない比較例1,2とを対比させつつ、詳細に説明する。
In the surface emitting module 1A according to the present embodiment, as described above, the light emitter 20, the light diffusion layer 30, and the wavelength conversion layer 40 are arranged in this order along the light traveling direction. The light incident on the conversion layer 40 becomes excitation light after being diffused by the light diffusion layer 30. Therefore, when the excitation light reaches the wavelength conversion layer 40, the luminance distribution of the excitation light becomes considerably smooth when viewed from the light exit surface P side. Based on this, in the surface emitting module 1A according to the present embodiment, the color of the light emitted from the light emitting surface P corresponding to the light emitting region A1 and the light emitting surface P corresponding to the non-light emitting region A2. It is possible to suppress a difference between the color of light emitted from the light source. Hereinafter, the mechanism will be described in detail while comparing Examples to which the present invention is applied with Comparative Examples 1 and 2 to which the present invention is not applied.
図4(A)は、検証試験において検証した実施例に係る面発光モジュールの概略構成図であり、図4(B)および図4(C)は、それぞれ検証試験において検証した比較例1および2に係る面発光モジュールの概略構成図である。また、図5は、実施例に係る面発光モジュールの各界面における規格化正面輝度プロファイルを示したグラフであり、図6および図7は、それぞれ比較例1および2に係る面発光モジュールの各界面における規格化正面輝度プロファイルを示したグラフである。
FIG. 4A is a schematic configuration diagram of the surface emitting module according to the example verified in the verification test. FIGS. 4B and 4C are Comparative Examples 1 and 2 verified in the verification test, respectively. It is a schematic block diagram of the surface emitting module which concerns on. FIG. 5 is a graph showing a normalized front luminance profile at each interface of the surface emitting module according to the example, and FIGS. 6 and 7 are interfaces of the surface emitting module according to Comparative Examples 1 and 2, respectively. It is the graph which showed the normalization front luminance profile in.
ここで、図5(A)ないし図5(C)に示した規格化正面輝度プロファイルは、それぞれ図4(A)において示した矢印VA~VCにおける規格化正面輝度プロファイルであり、図6(A)および図6(B)に示した規格化正面輝度プロファイルは、それぞれ図4(B)において示した矢印VIA,VIBにおける規格化正面輝度プロファイルであり、図7(A)ないし図7(C)に示した規格化正面輝度プロファイルは、それぞれ図4(C)において示した矢印VIIA~VIICにおける規格化正面輝度プロファイルである。また、図4(A)ないし図4(C)においては、電界発光層を含む有機層24以外の発光体20の構成については、便宜上、概略的にのみ示している。
Here, the normalized front luminance profiles shown in FIGS. 5A to 5C are normalized front luminance profiles at arrows VA to VC shown in FIG. 4A, respectively. ) And FIG. 6B are normalized front luminance profiles at arrows VIA and VIB shown in FIG. 4B, respectively, and are shown in FIG. 7A to FIG. 7C. The normalized front luminance profiles shown in Fig. 4 are normalized front luminance profiles at arrows VIIA to VIIC shown in Fig. 4C, respectively. Further, in FIGS. 4A to 4C, the configuration of the light emitter 20 other than the organic layer 24 including the electroluminescent layer is shown only schematically for convenience.
検証試験においては、本発明が適用された実施例として、図4(A)に示す如くの、上述した実施の形態1における面発光モジュールに準じた構成の面発光モジュール1Aをモデル化するとともに、本発明が適用されていない比較例1,2として、それぞれ図4(B)および図4(C)に示す如くの面発光モジュール1X,1Yをモデル化し、これら面発光モジュール1A,1X,1Yの各界面における規格化正面輝度プロファイルをシミュレーションによって算出した。
In the verification test, as an example to which the present invention is applied, as shown in FIG. 4A, a surface emitting module 1A having a configuration similar to the surface emitting module in the first embodiment described above is modeled, As Comparative Examples 1 and 2 to which the present invention is not applied, surface emitting modules 1X and 1Y as shown in FIGS. 4B and 4C are modeled, and the surface emitting modules 1A, 1X and 1Y are modeled. The normalized front luminance profile at each interface was calculated by simulation.
ここで、図4(A)に示すように、実施例に係る面発光モジュール1Aは、光の進行方向に沿って発光体20、透明基材10、光拡散層30、波長変換層40の順でこれらが位置してなるものである。一方、図4(B)に示すように、比較例1に係る面発光モジュール1Xは、光の進行方向に沿って発光体20、透明基材10、波長変換層40の順でこれらが位置してなるものである。また、図4(C)に示すように、比較例2に係る面発光モジュール1Yは、光の進行方向に沿って発光体20、透明基材10、波長変換層40、光拡散層30の順でこれらが位置してなるものである。
Here, as shown to FIG. 4 (A), the surface emitting module 1A which concerns on an Example is the order of the light-emitting body 20, the transparent base material 10, the light-diffusion layer 30, and the wavelength conversion layer 40 along the advancing direction of light. These are located. On the other hand, as shown in FIG. 4B, in the surface emitting module 1X according to the comparative example 1, these are positioned in the order of the light emitter 20, the transparent substrate 10, and the wavelength conversion layer 40 along the light traveling direction. It will be. As shown in FIG. 4C, the surface emitting module 1Y according to the comparative example 2 includes the light emitting body 20, the transparent substrate 10, the wavelength conversion layer 40, and the light diffusion layer 30 in this order along the light traveling direction. These are located.
図5(A)に示すように、実施例に係る面発光モジュール1Aにおいては、透明基材10から出射される励起光の規格化正面輝度プロファイルが、電界発光層を含む有機層24が位置する範囲である発光部幅Wの範囲内において輝度が高く、当該発光部幅Wから外れた範囲において輝度がほぼ0となる、急峻な変化を伴う輝度分布を有するものとなる。
As shown in FIG. 5A, in the surface emitting module 1A according to the embodiment, the normalized front luminance profile of the excitation light emitted from the transparent base material 10 is positioned with the organic layer 24 including the electroluminescent layer. The luminance is high within the range of the light emitting portion width W, which is a range, and has a luminance distribution with a steep change in which the luminance is almost zero in a range outside the light emitting portion width W.
これに対し、図5(B)に示すように、光拡散層30から出射される励起光の規格化正面輝度プロファイルは、当該光拡散層30において励起光が拡散されることにより、その輝度分布が相当程度に滑らかになったものとなる。
On the other hand, as shown in FIG. 5B, the normalized front luminance profile of the excitation light emitted from the light diffusion layer 30 has its luminance distribution as the excitation light is diffused in the light diffusion layer 30. Becomes considerably smoother.
さらに、図5(C)に示すように、波長変換層40(すなわち光出射面P)から出射される励起光および波長変換光の規格化正面輝度プロファイルは、当該波長変換層40において励起光および波長変換光ともに拡散されることにより、それらの輝度分布が相当程度に滑らかになったものとなる。
Furthermore, as shown in FIG. 5C, the normalized front luminance profile of the excitation light and the wavelength conversion light emitted from the wavelength conversion layer 40 (that is, the light exit surface P) By diffusing together with the wavelength-converted light, the luminance distribution thereof becomes considerably smooth.
この結果、発光領域A1の所定の位置p1(図4(A)参照)から出射される励起光と波長変換光との輝度の差ΔL1(図5(C)参照)と、非発光領域A2の所定の位置p2(図4(A)参照)から出射される励起光と波長変換光との輝度の差ΔL2(図5(C)参照)との差が比較的小さくなり(換言すれば、位置p1から出射される光における励起光成分と波長変換光成分との割合と、位置p2から出射される光における励起光成分と波長変換光成分との割合とが、互いに近い割合となり)、発光領域A1に対応する部分の光出射面Pから出射される光の色と、非発光領域A2に対応する部分の光出射面Pから出射される光の色とに差が生じることが抑制できることになる。
As a result, the luminance difference ΔL1 (see FIG. 5C) between the excitation light and the wavelength converted light emitted from the predetermined position p1 (see FIG. 4A) of the light emitting region A1 and the non-light emitting region A2 The difference between the luminance difference ΔL2 (see FIG. 5C) between the excitation light emitted from the predetermined position p2 (see FIG. 4A) and the wavelength converted light is relatively small (in other words, the position the ratio of the excitation light component and the wavelength converted light component in the light emitted from p1 and the ratio of the excitation light component and the wavelength converted light component in the light emitted from position p2 are close to each other) It is possible to suppress a difference between the color of the light emitted from the light emission surface P corresponding to A1 and the color of the light emitted from the light emission surface P corresponding to the non-light emitting region A2. .
一方、図6(A)に示すように、比較例1に係る面発光モジュール1Xにおいても、実施例に係る面発光モジュール1Aと同様に、透明基材10から出射される励起光の規格化正面輝度プロファイルは、電界発光層を含む有機層24が位置する範囲である発光部幅Wの範囲内において輝度が高く、当該発光部幅Wから外れた範囲において輝度がほぼ0となる、急峻な変化を伴う輝度分布を有するものとなる。
On the other hand, as shown in FIG. 6A, in the surface light emitting module 1X according to Comparative Example 1, as in the surface light emitting module 1A according to the example, the normalized front surface of the excitation light emitted from the transparent substrate 10 is used. The luminance profile is a sharp change in which the luminance is high within the range of the light emitting portion width W, which is the range where the organic layer 24 including the electroluminescent layer is located, and the luminance is substantially 0 in the range outside the light emitting portion width W. It has a luminance distribution accompanied by.
しかしながら、比較例1に係る面発光モジュール1Xにあっては、透明基材10から出射された励起光が次に波長変換層40に至ることになるため、波長変換層40に入射する光は、その輝度分布が相当程度に滑らかになったものではなく、上述した急峻な変化を伴う輝度分布を有するものとなる。
However, in the surface emitting module 1X according to Comparative Example 1, since the excitation light emitted from the transparent substrate 10 reaches the wavelength conversion layer 40 next, the light incident on the wavelength conversion layer 40 is The luminance distribution is not considerably smooth, but has a luminance distribution with the above-described steep change.
そのため、図6(B)に示すように、波長変換層40(すなわち光出射面P)から出射される励起光および波長変換光の規格化正面輝度プロファイルは、当該波長変換層40において励起光および波長変換光ともに拡散されることにより、波長変換光については、十分な拡散効果が得られてその輝度分布が相当程度に滑らかになったものとなる反面、励起光については、十分な拡散効果が得られず、一部に急峻な変化を伴う輝度分布を有するものとなってしまう。
Therefore, as shown in FIG. 6B, the normalized front luminance profile of the excitation light and the wavelength conversion light emitted from the wavelength conversion layer 40 (that is, the light emission surface P) By diffusing both the wavelength-converted light and the wavelength-converted light, a sufficient diffusion effect is obtained and the luminance distribution is smoothed to a considerable degree. On the other hand, the excitation light has a sufficient diffusion effect. It is not obtained, and partly has a luminance distribution with a steep change.
この結果、発光領域A1の所定の位置p1(図4(B)参照)から出射される励起光と波長変換光との輝度の差ΔL1(図6(B)参照)と、非発光領域A2の所定の位置p2(図4(B)参照)から出射される励起光と波長変換光との輝度の差ΔL2(図6(B)参照)との差が比較的大きくなり(換言すれば、位置p1から出射される光における励起光成分と波長変換光成分との割合と、位置p2から出射される光における励起光成分と波長変換光成分との割合とが、互いに大きく異なる割合となり)、発光領域A1に対応する部分の光出射面Pから出射される光の色と、非発光領域A2に対応する部分の光出射面Pから出射される光の色とに大きな差が生じてしまう。
As a result, the luminance difference ΔL1 (see FIG. 6B) between the excitation light and the wavelength converted light emitted from the predetermined position p1 (see FIG. 4B) of the light emitting region A1 and the non-light emitting region A2 The difference between the luminance difference ΔL2 (see FIG. 6B) between the excitation light emitted from the predetermined position p2 (see FIG. 4B) and the wavelength converted light becomes relatively large (in other words, the position the ratio of the excitation light component and the wavelength converted light component in the light emitted from p1 and the ratio of the excitation light component and the wavelength converted light component in the light emitted from the position p2 are greatly different from each other). There is a large difference between the color of light emitted from the light emission surface P corresponding to the region A1 and the color of light emitted from the light emission surface P corresponding to the non-light emitting region A2.
また、図7(A)に示すように、比較例2に係る面発光モジュール1Yにおいても、実施例に係る面発光モジュール1Aと同様に、透明基材10から出射される励起光の規格化正面輝度プロファイルは、電界発光層を含む有機層24が位置する範囲である発光部幅Wの範囲内において輝度が高く、当該発光部幅Wから外れた範囲において輝度がほぼ0となる、急峻な変化を伴う輝度分布を有するものとなる。
Further, as shown in FIG. 7A, also in the surface light emitting module 1Y according to Comparative Example 2, as in the surface light emitting module 1A according to the example, the normalized front surface of the excitation light emitted from the transparent substrate 10 is used. The luminance profile is a sharp change in which the luminance is high within the range of the light emitting portion width W, which is the range where the organic layer 24 including the electroluminescent layer is located, and the luminance is substantially 0 in the range outside the light emitting portion width W. It has a luminance distribution accompanied by.
しかしながら、比較例2に係る面発光モジュール1Yにあっても、比較例1に係る面発光モジュール1Xと同様に、透明基材10から出射された励起光が次に波長変換層40に至ることになるため、波長変換層40に入射する光は、その輝度分布が相当程度に滑らかになったものではなく、上述した急峻な変化を伴う輝度分布を有するものとなる。
However, even in the surface light emitting module 1Y according to Comparative Example 2, the excitation light emitted from the transparent substrate 10 reaches the wavelength conversion layer 40 next, similarly to the surface light emitting module 1X according to Comparative Example 1. Therefore, the light incident on the wavelength conversion layer 40 does not have a considerably smooth luminance distribution, but has a luminance distribution with the above-described steep change.
そのため、図7(B)に示すように、波長変換層40から出射される励起光および波長変換光の規格化正面輝度プロファイルは、当該波長変換層40において励起光および波長変換光ともに拡散されることにより、波長変換光については、十分な拡散効果が得られてその輝度分布が相当程度に滑らかになったものとなる反面、励起光については、十分な拡散効果が得られず、一部に急峻な変化を伴う輝度分布を有するものとなってしまう。
For this reason, as shown in FIG. 7B, the excitation light emitted from the wavelength conversion layer 40 and the normalized front luminance profile of the wavelength conversion light are diffused in the wavelength conversion layer 40 together with the excitation light and the wavelength conversion light. As a result, a sufficient diffusion effect is obtained for the wavelength-converted light and the luminance distribution becomes considerably smooth, whereas a sufficient diffusion effect is not obtained for the excitation light, and some A luminance distribution with a steep change will be obtained.
比較例2に係る面発光モジュール1Xにおいては、波長変換層40から出射された励起光および波長変換光が光拡散層30にさらに入射されることになるが、図7(C)に示すように、光拡散層30(すなわち光出射面P)から出射される励起光および波長変換光の規格化正面輝度プロファイルは、当該波長変換層40において励起光および波長変換光ともに拡散されることにより、波長変換光については、十分な拡散効果が得られてその輝度分布が相当程度に滑らかになったものとなる反面、励起光については、やはり十分な拡散効果が得られず、一部に急峻な変化を伴う輝度分布を有するものとなってしまう。
In the surface emitting module 1X according to the comparative example 2, the excitation light and the wavelength converted light emitted from the wavelength conversion layer 40 are further incident on the light diffusion layer 30, as shown in FIG. 7C. The normalized front luminance profile of the excitation light and the wavelength converted light emitted from the light diffusion layer 30 (that is, the light exit surface P) is diffused in the wavelength conversion layer 40 by diffusing both the excitation light and the wavelength converted light. As for the converted light, a sufficient diffusion effect is obtained and the luminance distribution becomes considerably smooth. On the other hand, for the excitation light, a sufficient diffusion effect is still not obtained, and some of the changes are steep. It will have a luminance distribution accompanied by.
この結果、発光領域A1の所定の位置p1(図4(C)参照)から出射される励起光と波長変換光との輝度の差ΔL1(図7(C)参照)と、非発光領域A2の所定の位置p2(図4(C)参照)から出射される励起光と波長変換光との輝度の差ΔL2(図7(C)参照)との差が比較的大きくなり(換言すれば、位置p1から出射される光における励起光成分と波長変換光成分との割合と、位置p2から出射される光における励起光成分と波長変換光成分との割合とが、互いに大きく異なる割合となり)、発光領域A1に対応する部分の光出射面Pから出射される光の色と、非発光領域A2に対応する部分の光出射面Pから出射される光の色とに大きな差が生じてしまう。
As a result, the luminance difference ΔL1 (see FIG. 7C) between the excitation light and the wavelength converted light emitted from the predetermined position p1 (see FIG. 4C) of the light emitting region A1 and the non-light emitting region A2 The difference between the luminance difference ΔL2 (see FIG. 7C) between the excitation light emitted from the predetermined position p2 (see FIG. 4C) and the wavelength converted light becomes relatively large (in other words, the position the ratio of the excitation light component and the wavelength converted light component in the light emitted from p1 and the ratio of the excitation light component and the wavelength converted light component in the light emitted from the position p2 are greatly different from each other). There is a large difference between the color of light emitted from the light emission surface P corresponding to the region A1 and the color of light emitted from the light emission surface P corresponding to the non-light emitting region A2.
以上のシミュレーション結果から明らかなように、本実施の形態における面発光モジュール1Aとすることにより、発光領域A1に対応する部分の光出射面Pから出射される光の色と、非発光領域A2に対応する部分の光出射面Pから出射される光の色とに差が生じることが抑制できる。
As is apparent from the simulation results described above, the surface emitting module 1A according to the present embodiment allows the color of light emitted from the light emitting surface P corresponding to the light emitting region A1 and the non-light emitting region A2 to be changed. It can suppress that a difference arises with the color of the light radiate | emitted from the light emission surface P of a corresponding part.
ここで、光拡散層30における光拡散作用は、電界発光層を含む有機層24と当該光拡散層30との間の距離(すなわちこれらの間の光路長)が長いほど高まることになる。したがって、有機層24と光拡散層30との間の距離を、光拡散層30と波長変換層40との間の距離よりも大きくすることにより、上述した色差が生じることを抑制できる効果が高まることになる。
Here, the light diffusing action in the light diffusion layer 30 increases as the distance between the organic layer 24 including the electroluminescent layer and the light diffusion layer 30 (that is, the optical path length between them) increases. Therefore, by making the distance between the organic layer 24 and the light diffusion layer 30 larger than the distance between the light diffusion layer 30 and the wavelength conversion layer 40, the effect of suppressing the above-described color difference is enhanced. It will be.
また、上記のように、透明基材10と光拡散層30とが他の層を介することなく密着している場合には、非発光領域A2に対応する部分の光拡散層30の光拡散度が、発光領域A1に対応する部分の光拡散層30の光拡散度よりも高いことが好ましい。このように構成した場合には、非発光領域A2に対応する部分においてより多くの光を外部に取り出すことが可能になるため、発光領域A1と非発光領域A2との境界Bをよりぼやかすことが可能になり、当該境界Bをさらに目立ち難くすることができる。なお、このような構成は、光拡散層30の部位ごとに含有させる拡散微粒子32の濃度を変化させることで実現できる。
Further, as described above, when the transparent substrate 10 and the light diffusion layer 30 are in close contact with each other without any other layer, the light diffusivity of the light diffusion layer 30 in the portion corresponding to the non-light emitting region A2 However, it is preferable that the degree of light diffusion of the light diffusion layer 30 corresponding to the light emitting region A1 is higher. In such a configuration, more light can be extracted to the outside at a portion corresponding to the non-light-emitting area A2, so that the boundary B between the light-emitting area A1 and the non-light-emitting area A2 is made more blurred. The boundary B can be made less noticeable. Such a configuration can be realized by changing the concentration of the diffusing fine particles 32 to be contained for each part of the light diffusion layer 30.
図8(A)は、実施例に係る面発光モジュールから出射された光の色度を示すグラフであり、図8(B)は、比較例1に係る面発光モジュールから出射された光の色度を示すグラフである。次に、この図8を参照して、上述した実施例および比較例1に係る面発光モジュール1A,1Xに準じた構成の面発光モジュールを実際に試作して、上述した位置p1,p2においてそれぞれ色度を実測した結果について説明する。
FIG. 8A is a graph showing the chromaticity of light emitted from the surface light emitting module according to the example, and FIG. 8B is a color of light emitted from the surface light emitting module according to Comparative Example 1. It is a graph which shows a degree. Next, referring to FIG. 8, surface light emitting modules having configurations similar to those of the surface light emitting modules 1A and 1X according to the example and the comparative example 1 described above are actually manufactured as prototypes at the positions p1 and p2, respectively. The result of actual measurement of chromaticity will be described.
ここで、実施例に係る面発光モジュール1Aを実際に試作するに際しては、厚さが0.2mmである透明基材上に発光体を形成したサブアセンブリと、厚さが0.2mmである透明基材上に光拡散層および波長変換層をこの順で形成したサブアセンブリとを、それらのサブアセンブリに含まれる透明基材同士がマッチングオイルを介して密着するように組付けることで製作した。
Here, when actually producing the surface emitting module 1A according to the example, a subassembly in which a light emitter is formed on a transparent substrate having a thickness of 0.2 mm, and a transparent having a thickness of 0.2 mm. A subassembly in which a light diffusion layer and a wavelength conversion layer were formed in this order on a base material was assembled by assembling so that the transparent base materials included in these subassemblies were in close contact with each other through matching oil.
一方、比較例1に係る面発光モジュール1Xを実際に試作するに際しては、厚さが0.2mmである透明基材上に発光体を形成したサブアセンブリと、厚さが0.2mmである透明基材上に波長変換層のみを形成したサブアセンブリとを、それらのサブアセンブリに含まれる透明基材同士がマッチングオイルを介して密着するように組付けることで製作した。
On the other hand, when the surface emitting module 1X according to Comparative Example 1 is actually prototyped, a subassembly in which a light emitter is formed on a transparent substrate having a thickness of 0.2 mm, and a transparent having a thickness of 0.2 mm. The subassemblies in which only the wavelength conversion layer was formed on the base material were assembled so that the transparent base materials included in those subassemblies were brought into close contact with each other through matching oil.
なお、実際に試作した実施例に係る面発光モジュール1Aと、実際に試作した比較例1に係る面発光モジュール1Xとでは、上述した構成以外の他の条件はすべて同じに設定し、励起光の波長は475nmとし、波長変換光の波長は560nmとした。
In addition, in the surface emitting module 1A according to the actually manufactured example and the surface emitting module 1X according to the actually manufactured comparative example 1, all other conditions other than the above-described configuration are set to be the same, and the excitation light The wavelength was 475 nm, and the wavelength of the wavelength converted light was 560 nm.
図8(A)および図8(B)に示すように、実際に試作した実施例に係る面発光モジュール1Aにおける位置p1での色度と位置p2での色度との差は、実際に試作した比較例1に係る面発光モジュール1Xにおける位置p1での色度と位置p2での色度との差よりも大幅に低減していることが理解される。
As shown in FIGS. 8A and 8B, the difference between the chromaticity at the position p1 and the chromaticity at the position p2 in the surface light emitting module 1A according to the actually manufactured example is actually a prototype. It is understood that the surface light emitting module 1X according to Comparative Example 1 is significantly reduced from the difference between the chromaticity at the position p1 and the chromaticity at the position p2.
したがって、当該結果に基づけば、本実施の形態における面発光モジュール1Aとすることにより、発光領域A1に対応する部分の光出射面Pから出射される光の色と、非発光領域A2に対応する部分の光出射面Pから出射される光の色とに差が生じることが抑制できることが、実験的にも確認されたと言える。
Therefore, based on the result, by using the surface emitting module 1A in the present embodiment, it corresponds to the color of light emitted from the light emitting surface P of the portion corresponding to the light emitting area A1 and the non-light emitting area A2. It can be said that it has been confirmed experimentally that it is possible to suppress the occurrence of a difference in the color of the light emitted from the partial light exit surface P.
なお、当該結果では、発光領域A1に対応する部分の光出射面Pから出射される光と、非発光領域A2に対応する部分の光出射面Pから出射される光との間の色差を完全には解消するには至っていないが、光拡散層の厚みやバインダーに分散させる拡散微粒子の濃度を調整すること等によって光拡散層の光拡散度を高めることにより、さらなる改善が図られるものと推察される。
In this result, the color difference between the light emitted from the light emitting surface P corresponding to the light emitting region A1 and the light emitted from the light emitting surface P corresponding to the non-light emitting region A2 is completely calculated. Although it has not yet been resolved, it is speculated that further improvement can be achieved by increasing the light diffusivity of the light diffusion layer by adjusting the thickness of the light diffusion layer and the concentration of diffusion fine particles dispersed in the binder. Is done.
ここで、波長変換光の波長は、特に制限されるものではなく任意であり、励起光の波長と面発光モジュールから出射させたい光の色度との関係に応じて適宜決定すればよい。また、面発光モジュールから出射させる光の色度についても、要求に応じて適宜決定すればよい。
Here, the wavelength of the wavelength-converted light is not particularly limited and is arbitrary, and may be appropriately determined according to the relationship between the wavelength of the excitation light and the chromaticity of the light desired to be emitted from the surface emitting module. Moreover, what is necessary is just to determine suitably the chromaticity of the light radiate | emitted from a surface emitting module according to a request | requirement.
(変形例)
図9ないし図17は、それぞれ上述した本実施の形態に基づいた第1ないし第9変形例に係る面発光モジュールの概略構成図である。以下、これら図9ないし図17を参照して、第1ないし第9変形例に係る面発光モジュール1B~1Jについて説明する。 (Modification)
9 to 17 are schematic configuration diagrams of surface emitting modules according to first to ninth modifications based on the above-described embodiment, respectively. Hereinafter,surface emitting modules 1B to 1J according to first to ninth modifications will be described with reference to FIGS.
図9ないし図17は、それぞれ上述した本実施の形態に基づいた第1ないし第9変形例に係る面発光モジュールの概略構成図である。以下、これら図9ないし図17を参照して、第1ないし第9変形例に係る面発光モジュール1B~1Jについて説明する。 (Modification)
9 to 17 are schematic configuration diagrams of surface emitting modules according to first to ninth modifications based on the above-described embodiment, respectively. Hereinafter,
(第1変形例)
図9に示すように、第1変形例に係る面発光モジュール1Bは、上述した本実施の形態における面発光モジュール1Aと比較した場合に、透明基材10と光拡散層30との間に導光部としての導光層50が設けられている点においてのみ相違している。 (First modification)
As shown in FIG. 9, thesurface emitting module 1B according to the first modified example is guided between the transparent base material 10 and the light diffusion layer 30 when compared with the surface emitting module 1A in the present embodiment described above. The only difference is that a light guide layer 50 as an optical part is provided.
図9に示すように、第1変形例に係る面発光モジュール1Bは、上述した本実施の形態における面発光モジュール1Aと比較した場合に、透明基材10と光拡散層30との間に導光部としての導光層50が設けられている点においてのみ相違している。 (First modification)
As shown in FIG. 9, the
導光層50は、電界発光層を含む有機層24と光拡散層30との間の距離をより長く確保するためのものであり、光の吸収が少ない材料にて構成されていることが好ましく、たとえばPMMA樹脂等からなる樹脂シートが透明基材10上に積層されることで構成される。
The light guide layer 50 is for securing a longer distance between the organic layer 24 including the electroluminescent layer and the light diffusion layer 30 and is preferably made of a material that absorbs less light. For example, a resin sheet made of PMMA resin or the like is laminated on the transparent substrate 10.
このように構成した場合にも、上述した本実施の形態において説明した効果と同様の効果を得ることができ、発光領域A1と非発光領域A2との境界Bを目立たなくすることができるとともに、上述した色差が生じることを抑制することができる。
Even when configured in this manner, the same effect as that described in the present embodiment can be obtained, the boundary B between the light emitting region A1 and the non-light emitting region A2 can be made inconspicuous, It can suppress that the color difference mentioned above arises.
(第2変形例)
図10に示すように、第2変形例に係る面発光モジュール1Cは、上述した本実施の形態における面発光モジュール1Aと比較した場合に、光拡散部が層状に形成された光拡散層30ではなく、平板状に形成された光拡散板30’にて構成されているとともに、波長変換部が層状に形成された波長変換層40ではなく、平板状に形成された波長変換板40’にて構成されている点において相違している。なお、波長変換板40’としては、蛍光ガラスが使用できる。 (Second modification)
As shown in FIG. 10, the surfacelight emitting module 1 </ b> C according to the second modified example has a light diffusing layer 30 in which the light diffusing portions are formed in layers when compared with the surface light emitting module 1 </ b> A in the present embodiment described above. The light diffusing plate 30 'is formed in a flat plate shape, and the wavelength conversion plate 40' is formed in a flat plate shape, not the wavelength conversion layer 40 in which the wavelength conversion portion is formed in a layer shape. It differs in that it is configured. As the wavelength conversion plate 40 ′, fluorescent glass can be used.
図10に示すように、第2変形例に係る面発光モジュール1Cは、上述した本実施の形態における面発光モジュール1Aと比較した場合に、光拡散部が層状に形成された光拡散層30ではなく、平板状に形成された光拡散板30’にて構成されているとともに、波長変換部が層状に形成された波長変換層40ではなく、平板状に形成された波長変換板40’にて構成されている点において相違している。なお、波長変換板40’としては、蛍光ガラスが使用できる。 (Second modification)
As shown in FIG. 10, the surface
ここで、透明基材10と光拡散板30’とは、必ずしも密着している必要はなく、図示するようにこれらの間に空隙60が位置していてもよい。また、光拡散板30’と波長変換板40’についても、これらが必ずしも密着している必要はなく、図示するようにこれらの間に空隙60が位置していてもよい。
Here, the transparent substrate 10 and the light diffusing plate 30 ′ are not necessarily in close contact with each other, and a gap 60 may be located between them as shown in the figure. Further, the light diffusion plate 30 ′ and the wavelength conversion plate 40 ′ are not necessarily in close contact with each other, and a gap 60 may be positioned between them as shown in the figure.
このように構成した場合にも、上述した本実施の形態において説明した効果と同様の効果を得ることができ、発光領域A1と非発光領域A2との境界Bを目立たなくすることができるとともに、上述した色差が生じることを抑制することができる。さらには、当該構成を採用した場合には、有機ELパネルと光拡散部と波長変換部とがそれぞれ別部品として製作できるため、製造の容易化が図られるとともに、歩留まりが向上するメリットも得られる。
Even when configured in this manner, the same effect as that described in the present embodiment can be obtained, the boundary B between the light emitting region A1 and the non-light emitting region A2 can be made inconspicuous, It can suppress that the color difference mentioned above arises. Furthermore, when this configuration is adopted, the organic EL panel, the light diffusing unit, and the wavelength converting unit can be manufactured as separate parts, which facilitates manufacturing and also provides an advantage of improving yield. .
(第3変形例)
図11に示すように、第3変形例に係る面発光モジュール1Dは、上述した本実施の形態における面発光モジュール1Aと比較した場合に、光拡散部が層状に形成された光拡散層30ではなく、平板状に形成された光拡散板30’にて構成されているとともに、波長変換部が当該光拡散板30’上に層状に形成された波長変換層40にて構成されている点において相違している。ここで、透明基材10と光拡散板30’とは、必ずしも密着している必要はなく、図示するようにこれらの間に空隙60が位置していてもよい。 (Third Modification)
As shown in FIG. 11, the surfacelight emitting module 1 </ b> D according to the third modification has a light diffusing layer 30 in which the light diffusing portions are formed in layers when compared with the surface light emitting module 1 </ b> A in the present embodiment described above. In the point which is comprised by the light-diffusion plate 30 'formed in flat form, and the wavelength conversion part is comprised by the wavelength conversion layer 40 formed in layers on the said light-diffusion plate 30'. It is different. Here, the transparent substrate 10 and the light diffusing plate 30 ′ are not necessarily in close contact with each other, and a gap 60 may be positioned between them as shown in the figure.
図11に示すように、第3変形例に係る面発光モジュール1Dは、上述した本実施の形態における面発光モジュール1Aと比較した場合に、光拡散部が層状に形成された光拡散層30ではなく、平板状に形成された光拡散板30’にて構成されているとともに、波長変換部が当該光拡散板30’上に層状に形成された波長変換層40にて構成されている点において相違している。ここで、透明基材10と光拡散板30’とは、必ずしも密着している必要はなく、図示するようにこれらの間に空隙60が位置していてもよい。 (Third Modification)
As shown in FIG. 11, the surface
このように構成した場合にも、上述した本実施の形態において説明した効果と同様の効果を得ることができ、発光領域A1と非発光領域A2との境界Bを目立たなくすることができるとともに、上述した色差が生じることを抑制することができる。さらには、当該構成を採用した場合には、有機ELパネルと光拡散部および波長変換部を含む部材とがそれぞれ別部品として製作できるため、製造の容易化が図られるとともに、歩留まりが向上するメリットも得られる。
Even when configured in this manner, the same effect as that described in the present embodiment can be obtained, the boundary B between the light emitting region A1 and the non-light emitting region A2 can be made inconspicuous, It can suppress that the color difference mentioned above arises. Furthermore, when the configuration is adopted, the organic EL panel and the member including the light diffusing unit and the wavelength converting unit can be manufactured as separate parts, thereby facilitating manufacturing and improving the yield. Can also be obtained.
(第4変形例)
図12に示すように、第4変形例に係る面発光モジュール1Eは、上述した本実施の形態における面発光モジュール1Aと比較した場合に、波長変換部が層状に形成された波長変換層40ではなく、平板状に形成された波長変換板40’にて構成されているとともに、光拡散部が当該波長変換板40’上に層状に形成された光拡散層30にて構成されている点において相違している。なお、波長変換板40’としては、蛍光ガラスが使用できる。ここで、透明基材10と光拡散層30とは、必ずしも密着している必要はなく、図示するようにこれらの間に空隙60が位置していてもよい。 (Fourth modification)
As shown in FIG. 12, the surfacelight emitting module 1E according to the fourth modified example has a wavelength conversion layer 40 in which the wavelength conversion portion is formed in a layer shape when compared with the surface light emitting module 1A in the present embodiment described above. In the point which is comprised by the wavelength conversion board 40 'formed in flat form, and the light-diffusion part is comprised by the light-diffusion layer 30 formed in layers on the said wavelength conversion board 40'. It is different. As the wavelength conversion plate 40 ′, fluorescent glass can be used. Here, the transparent base material 10 and the light diffusion layer 30 do not necessarily have to be in close contact with each other, and a gap 60 may be located between them as shown in the figure.
図12に示すように、第4変形例に係る面発光モジュール1Eは、上述した本実施の形態における面発光モジュール1Aと比較した場合に、波長変換部が層状に形成された波長変換層40ではなく、平板状に形成された波長変換板40’にて構成されているとともに、光拡散部が当該波長変換板40’上に層状に形成された光拡散層30にて構成されている点において相違している。なお、波長変換板40’としては、蛍光ガラスが使用できる。ここで、透明基材10と光拡散層30とは、必ずしも密着している必要はなく、図示するようにこれらの間に空隙60が位置していてもよい。 (Fourth modification)
As shown in FIG. 12, the surface
このように構成した場合にも、上述した本実施の形態において説明した効果と同様の効果を得ることができ、発光領域A1と非発光領域A2との境界Bを目立たなくすることができるとともに、上述した色差が生じることを抑制することができる。さらには、当該構成を採用した場合には、有機ELパネルと光拡散部および波長変換部を含む部材とがそれぞれ別部品として製作できるため、製造の容易化が図られるとともに、歩留まりが向上するメリットも得られる。
Even when configured in this manner, the same effect as that described in the present embodiment can be obtained, the boundary B between the light emitting region A1 and the non-light emitting region A2 can be made inconspicuous, It can suppress that the color difference mentioned above arises. Furthermore, when the configuration is adopted, the organic EL panel and the member including the light diffusing unit and the wavelength converting unit can be manufactured as separate parts, thereby facilitating manufacturing and improving the yield. Can also be obtained.
(第5変形例)
図13に示すように、第5変形例に係る面発光モジュール1Fは、上述した本実施の形態における面発光モジュール1Aと比較した場合に、光拡散部が層状に形成された光拡散層30ではなく、平板状に形成された光拡散板30’にて構成されているとともに、当該光拡散板30’上に発光体20が層状に形成されており、これにより透明基材10の使用が廃止されている点において相違している。また、当該面発光モジュール1Fにおいては、波長変換部が層状に形成された波長変換層40ではなく、平板状に形成された波長変換板40’にて構成されている。なお、波長変換板40’としては、蛍光ガラスが使用できる。ここで、光拡散板30’と波長変換板40’とは、必ずしも密着している必要はなく、図示するようにこれらの間に空隙60が位置していてもよい。 (5th modification)
As shown in FIG. 13, the surfacelight emitting module 1 </ b> F according to the fifth modification has a light diffusing layer 30 in which the light diffusing portions are formed in layers when compared with the surface light emitting module 1 </ b> A in the present embodiment described above. The light diffuser 30 'is formed in a flat plate shape, and the light emitter 20 is formed in a layer on the light diffuser plate 30', thereby eliminating the use of the transparent substrate 10. It is different in the point that is done. Moreover, in the said surface emitting module 1F, the wavelength conversion part is comprised with wavelength conversion board 40 'formed in flat form instead of the wavelength conversion layer 40 formed in layer form. As the wavelength conversion plate 40 ′, fluorescent glass can be used. Here, the light diffusion plate 30 ′ and the wavelength conversion plate 40 ′ do not necessarily need to be in close contact with each other, and a gap 60 may be located between them as shown in the figure.
図13に示すように、第5変形例に係る面発光モジュール1Fは、上述した本実施の形態における面発光モジュール1Aと比較した場合に、光拡散部が層状に形成された光拡散層30ではなく、平板状に形成された光拡散板30’にて構成されているとともに、当該光拡散板30’上に発光体20が層状に形成されており、これにより透明基材10の使用が廃止されている点において相違している。また、当該面発光モジュール1Fにおいては、波長変換部が層状に形成された波長変換層40ではなく、平板状に形成された波長変換板40’にて構成されている。なお、波長変換板40’としては、蛍光ガラスが使用できる。ここで、光拡散板30’と波長変換板40’とは、必ずしも密着している必要はなく、図示するようにこれらの間に空隙60が位置していてもよい。 (5th modification)
As shown in FIG. 13, the surface
このように構成した場合にも、上述した本実施の形態において説明した効果と同様の効果を得ることができ、発光領域A1と非発光領域A2との境界Bを目立たなくすることができるとともに、上述した色差が生じることを抑制することができる。さらには、当該構成を採用した場合には、光拡散板30’および発光体20を含む部材と波長変換板40’とを別部品として製作できるとともに透明基材10を廃止することができるため、部品点数の削減が可能でかつ製造の容易化が図られるメリットも得られる。
Even when configured in this manner, the same effect as that described in the present embodiment can be obtained, the boundary B between the light emitting region A1 and the non-light emitting region A2 can be made inconspicuous, It can suppress that the color difference mentioned above arises. Furthermore, when the structure is employed, the transparent substrate 10 can be eliminated while the member including the light diffusing plate 30 ′ and the light emitter 20 and the wavelength conversion plate 40 ′ can be manufactured as separate parts. The advantage is that the number of parts can be reduced and manufacturing can be facilitated.
(第6変形例)
図14に示すように、第6変形例に係る面発光モジュール1Gは、上述した本実施の形態における面発光モジュール1Aと比較した場合に、光拡散部が層状に形成された光拡散層30ではなく、平板状に形成された光拡散板30’にて構成されているとともに、当該光拡散板30’上に発光体20が層状に形成されており、これにより透明基材10の使用が廃止されている点において相違している。また、当該面発光モジュール1Gにおいては、波長変換部が光拡散板30’上に層状に形成された波長変換層40にて構成されている。 (Sixth Modification)
As shown in FIG. 14, the surfacelight emitting module 1 </ b> G according to the sixth modified example has a light diffusing layer 30 in which the light diffusing portion is formed in a layer shape when compared with the surface light emitting module 1 </ b> A in the present embodiment described above. The light diffuser 30 'is formed in a flat plate shape, and the light emitter 20 is formed in a layer on the light diffuser plate 30', thereby eliminating the use of the transparent substrate 10. It is different in the point that is done. Moreover, in the said surface emitting module 1G, the wavelength conversion part is comprised by the wavelength conversion layer 40 formed in layers on light diffusing plate 30 '.
図14に示すように、第6変形例に係る面発光モジュール1Gは、上述した本実施の形態における面発光モジュール1Aと比較した場合に、光拡散部が層状に形成された光拡散層30ではなく、平板状に形成された光拡散板30’にて構成されているとともに、当該光拡散板30’上に発光体20が層状に形成されており、これにより透明基材10の使用が廃止されている点において相違している。また、当該面発光モジュール1Gにおいては、波長変換部が光拡散板30’上に層状に形成された波長変換層40にて構成されている。 (Sixth Modification)
As shown in FIG. 14, the surface
このように構成した場合にも、上述した本実施の形態において説明した効果と同様の効果を得ることができ、発光領域A1と非発光領域A2との境界Bを目立たなくすることができるとともに、上述した色差が生じることを抑制することができる。さらには、当該構成を採用した場合には、透明基材10を廃止することができるため、部品点数が削減できるとともに製造の容易化が図られるメリットも得られる。
Even when configured in this manner, the same effect as that described in the present embodiment can be obtained, the boundary B between the light emitting region A1 and the non-light emitting region A2 can be made inconspicuous, It can suppress that the color difference mentioned above arises. Furthermore, when the said structure is employ | adopted, since the transparent base material 10 can be abolished, the merit which simplifies manufacture can be obtained while the number of parts can be reduced.
(第7変形例)
図15に示すように、第7変形例に係る面発光モジュール1Hは、上述した本実施の形態における面発光モジュール1Aと比較した場合に、波長変換部が層状に形成された波長変換層40ではなく、平板状に形成された波長変換板40’にて構成されているとともに、光拡散部が当該波長変換板40’上に層状に形成された光拡散層30にて構成されており、さらには、発光体20が光拡散層30上に層状に形成されている点において相違している。なお、波長変換板40’としては、蛍光ガラスが使用できる。 (Seventh Modification)
As shown in FIG. 15, the surfacelight emitting module 1H according to the seventh modification has a wavelength conversion layer 40 in which the wavelength conversion portion is formed in a layer shape when compared with the surface light emitting module 1A in the present embodiment described above. The light diffusing part is composed of a light diffusing layer 30 formed in a layer on the wavelength converting plate 40 ′, and is composed of a wavelength converting plate 40 ′ formed in a flat plate shape. Is different in that the light-emitting body 20 is formed in a layer shape on the light diffusion layer 30. As the wavelength conversion plate 40 ′, fluorescent glass can be used.
図15に示すように、第7変形例に係る面発光モジュール1Hは、上述した本実施の形態における面発光モジュール1Aと比較した場合に、波長変換部が層状に形成された波長変換層40ではなく、平板状に形成された波長変換板40’にて構成されているとともに、光拡散部が当該波長変換板40’上に層状に形成された光拡散層30にて構成されており、さらには、発光体20が光拡散層30上に層状に形成されている点において相違している。なお、波長変換板40’としては、蛍光ガラスが使用できる。 (Seventh Modification)
As shown in FIG. 15, the surface
このように構成した場合にも、上述した本実施の形態において説明した効果と同様の効果を得ることができ、発光領域A1と非発光領域A2との境界Bを目立たなくすることができるとともに、上述した色差が生じることを抑制することができる。さらには、当該構成を採用した場合には、透明基材10を廃止することができるため、部品点数が削減できるとともに製造の容易化が図られるメリットも得られる。
Even when configured in this manner, the same effect as that described in the present embodiment can be obtained, the boundary B between the light emitting region A1 and the non-light emitting region A2 can be made inconspicuous, It can suppress that the color difference mentioned above arises. Furthermore, when the said structure is employ | adopted, since the transparent base material 10 can be abolished, the merit which simplifies manufacture can be obtained while the number of parts can be reduced.
(第8変形例)
図16に示すように、第8変形例に係る面発光モジュール1Iは、上述した本実施の形態における面発光モジュール1Aと比較した場合に、基材10’および発光体20によって主として構成される有機ELパネルが、基材10’を経由することなく光が外部に取り出されるトップエミッション型のものである点において相違している。この場合、基材10’は、発光体20から見て光拡散層30が位置する側とは反対側に位置することになるため、透明である必要性はない。 (Eighth modification)
As shown in FIG. 16, thesurface emitting module 1I according to the eighth modified example is an organic structure mainly composed of the base material 10 ′ and the light emitter 20 when compared with the surface emitting module 1A in the present embodiment described above. The EL panel is different in that it is of a top emission type in which light is extracted outside without passing through the base material 10 '. In this case, since the base material 10 ′ is located on the side opposite to the side where the light diffusion layer 30 is located when viewed from the light emitter 20, it is not necessary to be transparent.
図16に示すように、第8変形例に係る面発光モジュール1Iは、上述した本実施の形態における面発光モジュール1Aと比較した場合に、基材10’および発光体20によって主として構成される有機ELパネルが、基材10’を経由することなく光が外部に取り出されるトップエミッション型のものである点において相違している。この場合、基材10’は、発光体20から見て光拡散層30が位置する側とは反対側に位置することになるため、透明である必要性はない。 (Eighth modification)
As shown in FIG. 16, the
このように構成した場合にも、上述した本実施の形態において説明した効果と同様の効果を得ることができ、発光領域A1と非発光領域A2との境界Bを目立たなくすることができるとともに、上述した色差が生じることを抑制することができる。
Even when configured in this manner, the same effect as that described in the present embodiment can be obtained, the boundary B between the light emitting region A1 and the non-light emitting region A2 can be made inconspicuous, It can suppress that the color difference mentioned above arises.
(第9変形例)
図17に示すように、第9変形例に係る面発光モジュール1Jは、上述した本実施の形態における面発光モジュール1Aと比較した場合に、付加光拡散部としての付加光拡散板70をさらに備えている点において相違している。 (Ninth Modification)
As shown in FIG. 17, thesurface emitting module 1J according to the ninth modification further includes an additional light diffusing plate 70 as an additional light diffusing portion when compared with the surface emitting module 1A in the present embodiment described above. Is different.
図17に示すように、第9変形例に係る面発光モジュール1Jは、上述した本実施の形態における面発光モジュール1Aと比較した場合に、付加光拡散部としての付加光拡散板70をさらに備えている点において相違している。 (Ninth Modification)
As shown in FIG. 17, the
付加光拡散板70は、波長変換層40から見て光拡散層30が位置する側とは反対側に位置している。付加光拡散板70は、たとえばバインダー71と拡散微粒子72とを含んだ板状の部材にて構成されており、波長変換層40から出射された励起光および波長変換光をさらに拡散させるためのものである。
The additional light diffusion plate 70 is located on the side opposite to the side where the light diffusion layer 30 is located when viewed from the wavelength conversion layer 40. The additional light diffusing plate 70 is constituted by a plate-like member including, for example, a binder 71 and diffusing fine particles 72, and further diffuses excitation light and wavelength converted light emitted from the wavelength conversion layer 40. It is.
このように構成した場合にも、上述した本実施の形態において説明した効果と同様の効果を得ることができ、発光領域A1と非発光領域A2との境界Bを目立たなくすることができるとともに、上述した色差が生じることを抑制することができ、さらには、付加光拡散板70の作用によってこれら効果をさらに高めることができる。
Even when configured in this manner, the same effect as that described in the present embodiment can be obtained, the boundary B between the light emitting region A1 and the non-light emitting region A2 can be made inconspicuous, The above-described color difference can be prevented from occurring, and further, these effects can be further enhanced by the action of the additional light diffusion plate 70.
上述した本発明の実施の形態ならびにその変形例においては、光拡散部および付加光拡散部として、バインダーと拡散微粒子とによって構成されたものを例示して説明を行なったが、表面に凹凸を有することで界面反射作用を利用して光を拡散するもの等を用いることも当然に可能である。
In the above-described embodiment of the present invention and its modifications, the light diffusing portion and the additional light diffusing portion have been described by exemplifying those composed of a binder and diffusing fine particles, but the surface has irregularities. Thus, it is naturally possible to use a material that diffuses light by utilizing the interface reflection action.
また、上述した本発明の実施の形態ならびにその変形例においては、外部に向けて白色の光を出射することが可能に構成された面発光モジュールに本発明を適用した場合を例示したが、本発明の適用範囲はこれに限られず、外部に向けて白色以外の色の光を出射することが可能に構成された面発光モジュールにも当然に本発明の適用が可能である。
Further, in the above-described embodiment of the present invention and the modifications thereof, the case where the present invention is applied to a surface emitting module configured to be able to emit white light toward the outside is illustrated. The scope of application of the present invention is not limited to this, and the present invention can naturally be applied to a surface emitting module configured to emit light of a color other than white toward the outside.
また、上述した本発明の実施の形態ならびにその変形例においては、電界発光層として有機電界発光層を具備した有機ELパネルを備えてなる面発光モジュールに本発明を適用した場合を例示したが、本発明の適用範囲はこれに限られず、電界発光層として無機電界発光層を具備した無機ELパネルを備えてなる面発光モジュールに本発明を適用することも当然に可能である。
Moreover, in the above-described embodiment of the present invention and the modification thereof, the case where the present invention is applied to a surface emitting module including an organic EL panel including an organic electroluminescent layer as an electroluminescent layer is exemplified. The scope of application of the present invention is not limited to this, and it is naturally possible to apply the present invention to a surface emitting module including an inorganic EL panel having an inorganic electroluminescent layer as an electroluminescent layer.
また、上述した本発明の実施の形態ならびにその変形例においては、有機ELパネルの正孔輸送層の厚みを調整することで所望の配光特性が得られるようにした場合を例示したが、所望の配光特性を得る方法としてはこれに限定されるものではなく、たとえば有機ELパネルの膜構成を変更するといったような他の方法の適用も当然に可能である。また、面発光パネルとして有機ELパネル以外の光源を具備したものを使用する場合にも、当該光源の構成等を種々調整することにより、上述した如くの所望の配光特性を得ることができる。
Further, in the above-described embodiment of the present invention and the modification thereof, the case where desired light distribution characteristics are obtained by adjusting the thickness of the hole transport layer of the organic EL panel is exemplified. The method for obtaining the light distribution characteristics is not limited to this, and other methods such as changing the film configuration of the organic EL panel can naturally be applied. Moreover, also when using what has light sources other than an organic electroluminescent panel as a surface emitting panel, the desired light distribution characteristic as mentioned above can be acquired by variously adjusting the structure of the said light source.
また、上述した本発明の実施の形態ならびにその変形例において示した特徴的な構成は、本発明の趣旨を逸脱しない範囲で当然に相互にその組み合わせが可能である。
The characteristic configurations shown in the above-described embodiment of the present invention and the modifications thereof can naturally be combined with each other without departing from the spirit of the present invention.
以上において説明した面発光モジュールを要約すると、以下のとおりとなる。面発光モジュールは、発光体と、光拡散部と、波長変換部と、光出射面とを備えている。上記発光体は、電圧が印加されることによって励起光を発光する電界発光層を含んでいる。上記光拡散部は、上記発光体から出射された励起光の波長を変換することなく励起光を拡散させる部位である。上記波長変換部は、上記光拡散部から見て上記発光体が位置する側とは反対側に位置し、上記光拡散部から出射された励起光の一部を励起光とは異なる波長の波長変換光に変換するとともに、その内部において励起光と波長変換光とを拡散させる部位である。上記光出射面は、上記波長変換部を通過した後の励起光および波長変換光を外部に向けて出射する部位である。上記発光体は、上記光出射面と直交する方向から見た場合に、上記電界発光層が位置する領域である発光領域と、上記電界発光層が位置しない領域である非発光領域とを含んでいる。上記光拡散部および上記波長変換部は、上記光出射面と直交する方向から見た場合に、上記発光領域と上記非発光領域との境界を跨ぐように設けられている。
The surface emitting module described above is summarized as follows. The surface light emitting module includes a light emitter, a light diffusing unit, a wavelength converting unit, and a light emitting surface. The luminous body includes an electroluminescent layer that emits excitation light when a voltage is applied thereto. The light diffusion part is a part that diffuses the excitation light without converting the wavelength of the excitation light emitted from the light emitter. The wavelength conversion unit is located on a side opposite to the side where the light emitter is located when viewed from the light diffusion unit, and a part of the excitation light emitted from the light diffusion unit has a wavelength different from that of the excitation light. This is a part that converts the light into converted light and diffuses the excitation light and the wavelength-converted light therein. The light emitting surface is a part that emits the excitation light and the wavelength converted light after passing through the wavelength converting unit to the outside. The light emitter includes a light emitting region that is a region where the electroluminescent layer is located and a non-light emitting region that is a region where the electroluminescent layer is not located when viewed from a direction orthogonal to the light emitting surface. Yes. The light diffusing unit and the wavelength converting unit are provided so as to straddle the boundary between the light emitting region and the non-light emitting region when viewed from a direction orthogonal to the light emitting surface.
また、上記面発光モジュールにあっては、上記電界発光層と上記光拡散部との間の距離が、上記光拡散部と上記波長変換部との間の距離よりも大きいことが好ましい。
Moreover, in the surface emitting module, it is preferable that the distance between the electroluminescent layer and the light diffusing part is larger than the distance between the light diffusing part and the wavelength converting part.
また、上記面発光モジュールは、上記発光体をその一方の主表面上に層状に形成するための透明基材をさらに備えていてもよく、その場合には、上記透明基材が、上記発光体と上記光拡散部との間に位置していてもよい。
In addition, the surface light emitting module may further include a transparent base material for forming the light emitter in a layered form on one main surface thereof, in which case the transparent base material is the light emitter. And the light diffusion part.
また、上記面発光モジュールにあっては、上記透明基材と上記光拡散部とが、他の層を介することなく密着していてもよく、その場合には、上記非発光領域に対応する部分の上記光拡散部の光拡散度が、上記発光領域に対応する部分の上記光拡散部の光拡散度よりも高いことが好ましい。
Moreover, in the said surface emitting module, the said transparent base material and the said light-diffusion part may be closely_contact | adhered without passing through another layer, In that case, the part corresponding to the said non-light-emitting area | region It is preferable that the light diffusion degree of the light diffusion part is higher than the light diffusion degree of the light diffusion part in the portion corresponding to the light emitting region.
また、上記面発光モジュールにあっては、上記光拡散部が、上記透明基材の他方の主表面上に層状に形成された光拡散層にて構成されていてもよい。
Further, in the surface light emitting module, the light diffusing portion may be constituted by a light diffusing layer formed in a layer on the other main surface of the transparent base material.
また、上記面発光モジュールにあっては、上記波長変換部が、上記光拡散層上に層状に形成された波長変換層にて構成されていてもよい。
Further, in the surface emitting module, the wavelength conversion unit may be configured by a wavelength conversion layer formed in a layer shape on the light diffusion layer.
また、上記面発光モジュールは、上記透明基材と上記光拡散部との間に位置する導光部をさらに備えていてもよい。
Moreover, the surface emitting module may further include a light guide unit positioned between the transparent base material and the light diffusion unit.
また、上記面発光モジュールは、上記発光体をその一方の主表面上に層状に形成するための基材をさらに備えていてもよく、その場合には、上記基材が、上記発光体から見て上記光拡散部が位置する側とは反対側に位置していてもよい。
In addition, the surface emitting module may further include a base material for forming the light emitter in a layered form on one main surface, in which case the base material is viewed from the light emitter. The light diffusing unit may be located on the opposite side of the side.
また、上記面発光モジュールにあっては、上記光拡散部が、平板状の部材である光拡散板にて構成されていてもよく、その場合には、上記波長変換部が、上記光拡散板上に層状に形成された波長変換層にて構成されていてもよい。
Moreover, in the surface emitting module, the light diffusing portion may be configured by a light diffusing plate which is a flat plate member. In that case, the wavelength converting portion is the light diffusing plate. You may be comprised by the wavelength conversion layer formed in layer shape on the top.
また、上記面発光モジュールにあっては、上記発光体が、上記光拡散板上に層状に形成されていてもよい。
Further, in the surface light emitting module, the light emitter may be formed in layers on the light diffusion plate.
また、上記面発光モジュールにあっては、上記光拡散部が、平板状の部材である光拡散板にて構成されていてもよく、その場合には、上記発光体が、上記光拡散板上に層状に形成されていてもよい。
Further, in the surface light emitting module, the light diffusing portion may be configured by a light diffusing plate which is a flat plate member. In that case, the light emitter is disposed on the light diffusing plate. It may be formed in layers.
また、上記面発光モジュールにあっては、上記波長変換部が、平板状の部材である波長変換板にて構成されていてもよく、その場合には、上記光拡散部が、上記波長変換板上に層状に形成された光拡散層にて構成されていてもよい。
Moreover, in the said surface emitting module, the said wavelength conversion part may be comprised with the wavelength conversion board which is a flat member, In that case, the said light-diffusion part is the said wavelength conversion board. You may comprise by the light-diffusion layer formed in the layer form on it.
また、上記面発光モジュールにあっては、上記発光体が、上記光拡散層上に層状に形成されていてもよい。
Further, in the surface light emitting module, the light emitter may be formed in layers on the light diffusion layer.
また、上記面発光モジュールは、上記波長変換部から見て上記光拡散部が位置する側とは反対側に位置し、上記波長変換部から出射された励起光および波長変換光をさらに拡散させる付加光拡散部を備えていてもよい。
The surface emitting module is located on the side opposite to the side where the light diffusing unit is located when viewed from the wavelength converting unit, and further diffuses the excitation light and wavelength converted light emitted from the wavelength converting unit. You may provide the light-diffusion part.
また、上記面発光モジュールにあっては、上記発光体から出射される励起光の当該発光体の主面と垂直な平面における配光曲線を描いた場合に、上記主面の法線方向に延在する光軸に沿った正面側の輝度を1とし、上記平面内において上記光軸との間で形成される角がθである方向の輝度をLとすると、上記配光曲線が、L>cosθの条件を満たす部分を少なくとも有していることが好ましい。
Further, in the surface emitting module, when a light distribution curve of the excitation light emitted from the light emitter is drawn in a plane perpendicular to the main surface of the light emitter, the surface light emitting module extends in the normal direction of the main surface. When the luminance on the front side along the existing optical axis is 1, and the luminance in the direction in which the angle formed with the optical axis in the plane is θ is L, the light distribution curve is expressed as L> It is preferable to have at least a portion that satisfies the condition of cos θ.
今回開示した上記実施の形態ならびにその変形例はすべての点で例示であって、制限的なものではない。本発明の技術的範囲は請求の範囲によって画定され、また請求の範囲の記載と均等の意味および範囲内でのすべての変更を含むものである。
The above-described embodiment and its modifications disclosed herein are illustrative in all respects and are not restrictive. The technical scope of the present invention is defined by the scope of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
1A~1J 面発光モジュール、10 透明基材、10’ 基材、11,12 配線部、20 発光体、21 素子部、22 陽極、23 陰極、24 有機層、25 絶縁部、26 封止部、30 光拡散層、30’ 光拡散板、31 バインダー、32 拡散微粒子、40 波長変換層、40’ 波長変換板、41 バインダー、42 波長変換微粒子、50 導光層、60 空隙、70 付加光拡散板、71 バインダー、72 拡散微粒子、A1 発光領域、A2 非発光領域、B 境界、P 光出射面。
1A to 1J surface light emitting module, 10 transparent substrate, 10 ′ substrate, 11, 12 wiring portion, 20 light emitter, 21 element portion, 22 anode, 23 cathode, 24 organic layer, 25 insulation portion, 26 sealing portion, 30 light diffusion layer, 30 'light diffusion plate, 31 binder, 32 diffusion fine particles, 40 wavelength conversion layer, 40' wavelength conversion plate, 41 binder, 42 wavelength conversion fine particles, 50 light guide layer, 60 gap, 70 additional light diffusion plate , 71 binder, 72 diffusing fine particles, A1 light emitting area, A2 non-light emitting area, B boundary, P light emitting surface.
Claims (15)
- 電圧が印加されることによって励起光を発光する電界発光層を含む発光体と、
前記発光体から出射された励起光の波長を変換することなく励起光を拡散させる光拡散部と、
前記光拡散部から見て前記発光体が位置する側とは反対側に位置し、前記光拡散部から出射された励起光の一部を励起光とは異なる波長の波長変換光に変換するとともに、その内部において励起光と波長変換光とを拡散させる波長変換部と、
前記波長変換部を通過した後の励起光および波長変換光を外部に向けて出射する光出射面とを備え、
前記発光体は、前記光出射面と直交する方向から見た場合に、前記電界発光層が位置する領域である発光領域と、前記電界発光層が位置しない領域である非発光領域とを含み、
前記光拡散部および前記波長変換部が、前記光出射面と直交する方向から見た場合に、前記発光領域と前記非発光領域との境界を跨ぐように設けられている、面発光モジュール。 A light emitter including an electroluminescent layer that emits excitation light when a voltage is applied;
A light diffusing unit that diffuses the excitation light without converting the wavelength of the excitation light emitted from the light emitter;
A part of the excitation light emitted from the light diffusion part is converted into wavelength-converted light having a wavelength different from that of the excitation light, located on the side opposite to the side where the light emitter is located when viewed from the light diffusion part. A wavelength conversion unit for diffusing the excitation light and the wavelength conversion light inside,
A light exit surface that emits the excitation light and the wavelength converted light after passing through the wavelength conversion unit toward the outside,
The light emitter includes a light emitting region that is a region where the electroluminescent layer is located and a non-light emitting region that is a region where the electroluminescent layer is not located when viewed from a direction orthogonal to the light emitting surface,
The surface emitting module, wherein the light diffusing unit and the wavelength converting unit are provided so as to straddle a boundary between the light emitting region and the non-light emitting region when viewed from a direction orthogonal to the light emitting surface. - 前記電界発光層と前記光拡散部との間の距離が、前記光拡散部と前記波長変換部との間の距離よりも大きい、請求項1に記載の面発光モジュール。 The surface emitting module according to claim 1, wherein a distance between the electroluminescent layer and the light diffusing unit is larger than a distance between the light diffusing unit and the wavelength converting unit.
- 前記発光体をその一方の主表面上に層状に形成するための透明基材をさらに備え、
前記透明基材が、前記発光体と前記光拡散部との間に位置している、請求項1または2に記載の面発光モジュール。 Further comprising a transparent substrate for forming the luminous body in a layered manner on one main surface thereof,
The surface emitting module according to claim 1, wherein the transparent substrate is located between the light emitter and the light diffusion portion. - 前記透明基材と前記光拡散部とが、他の層を介することなく密着し、
前記非発光領域に対応する部分の前記光拡散部の光拡散度が、前記発光領域に対応する部分の前記光拡散部の光拡散度よりも高い、請求項3に記載の面発光モジュール。 The transparent substrate and the light diffusing part are in close contact with each other without any other layer,
The surface emitting module according to claim 3, wherein a light diffusivity of the light diffusing portion in a portion corresponding to the non-light emitting region is higher than a light diffusivity of the light diffusing portion in a portion corresponding to the light emitting region. - 前記光拡散部が、前記透明基材の他方の主表面上に層状に形成された光拡散層にて構成されている、請求項3または4に記載の面発光モジュール。 The surface emitting module according to claim 3 or 4, wherein the light diffusing portion is constituted by a light diffusing layer formed in a layered manner on the other main surface of the transparent substrate.
- 前記波長変換部が、前記光拡散層上に層状に形成された波長変換層にて構成されている、請求項5に記載の面発光モジュール。 The surface emitting module according to claim 5, wherein the wavelength conversion unit is configured by a wavelength conversion layer formed in a layer shape on the light diffusion layer.
- 前記透明基材と前記光拡散部との間に位置する導光部をさらに備えた、請求項3に記載の面発光モジュール。 The surface emitting module according to claim 3, further comprising a light guide portion positioned between the transparent base material and the light diffusion portion.
- 前記発光体をその一方の主表面上に層状に形成するための基材をさらに備え、
前記基材が、前記発光体から見て前記光拡散部が位置する側とは反対側に位置している、請求項1または2に記載の面発光モジュール。 Further comprising a base material for forming the luminous body in a layered form on one main surface thereof,
The surface emitting module according to claim 1, wherein the base material is located on a side opposite to a side where the light diffusion portion is located when viewed from the light emitter. - 前記光拡散部が、平板状の部材である光拡散板にて構成され、
前記波長変換部が、前記光拡散板上に層状に形成された波長変換層にて構成されている、請求項1または2に記載の面発光モジュール。 The light diffusing part is composed of a light diffusing plate which is a flat plate member,
The surface emitting module according to claim 1, wherein the wavelength conversion unit includes a wavelength conversion layer formed in a layered manner on the light diffusing plate. - 前記発光体が、前記光拡散板上に層状に形成されている、請求項9に記載の面発光モジュール。 10. The surface emitting module according to claim 9, wherein the light emitter is formed in a layer on the light diffusion plate.
- 前記光拡散部が、平板状の部材である光拡散板にて構成され、
前記発光体が、前記光拡散板上に層状に形成されている、請求項1または2に記載の面発光モジュール。 The light diffusing part is composed of a light diffusing plate which is a flat plate member,
The surface emitting module according to claim 1, wherein the light emitter is formed in a layered manner on the light diffusion plate. - 前記波長変換部が、平板状の部材である波長変換板にて構成され、
前記光拡散部が、前記波長変換板上に層状に形成された光拡散層にて構成されている、請求項1または2に記載の面発光モジュール。 The wavelength conversion unit is composed of a wavelength conversion plate that is a flat plate member,
The surface emitting module according to claim 1, wherein the light diffusing unit is configured by a light diffusing layer formed in a layered manner on the wavelength conversion plate. - 前記発光体が、前記光拡散層上に層状に形成されている、請求項12に記載の面発光モジュール。 The surface emitting module according to claim 12, wherein the light emitter is formed in a layered manner on the light diffusion layer.
- 前記波長変換部から見て前記光拡散部が位置する側とは反対側に位置し、前記波長変換部から出射された励起光および波長変換光をさらに拡散させる付加光拡散部を備えた、請求項1から13のいずれかに記載の面発光モジュール。 An additional light diffusing unit located on the side opposite to the side where the light diffusing unit is located when viewed from the wavelength converting unit and further diffusing the excitation light and wavelength converted light emitted from the wavelength converting unit. Item 14. The surface emitting module according to any one of Items 1 to 13.
- 前記発光体から出射される励起光の当該発光体の主面と垂直な平面における配光曲線を描いた場合に、前記主面の法線方向に延在する光軸に沿った正面側の輝度を1とし、前記平面内において前記光軸との間で形成される角がθである方向の輝度をLとすると、前記配光曲線が、L>cosθの条件を満たす部分を少なくとも有している、請求項1から14のいずれかに記載の面発光モジュール。 Luminance on the front side along the optical axis extending in the normal direction of the main surface when a light distribution curve of the excitation light emitted from the light emitter is drawn in a plane perpendicular to the main surface of the light emitter Is 1 and the luminance in the direction in which the angle formed with the optical axis in the plane is θ is L, the light distribution curve has at least a portion satisfying the condition of L> cos θ. The surface emitting module according to claim 1.
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