• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present disclosure relates to a light emitting device using an organic EL. The light emitting device (10, 50, 60, 61, 62, 710, 900) comprises an organic electroluminescence panel (12, 712, 911, 912) in which a plurality of light emitting portions (20a-20f) is arranged in a predetermined direction. The plurality of light emitting portions are configured such that their brightness is gradually reduced to the predetermined direction.
    公开号:FR3043444A1
    申请号:FR1660620
    申请日:2016-11-03
    公开日:2017-05-12
    发明作者:Masaya Shido；Toru Ito；Koji Magori；Yoshiro Ito
    申请人:Koito Manufacturing Co Ltd；
    IPC主号:
    专利说明:

    Domain [0001]
    The present disclosure relates to a light emitting device using organic EL (electroluminescence).
    Background [0002]
    Conventionally, in order to reduce the thickness and size of a light emitting device such as a vehicle lamp, it has been suggested to use an organic electroluminescence panel as a light source (for example, see the document patent 1).
    [0003]
    Patent Document 1: Japanese Patent Publication Laid-Open 2014-110178 [0004]
    Since an organic electroluminescence panel typically has a planar light emitting surface, a light emitting device using the organic electroluminescence panel as a light source tends to have a uniform design.
    [0005]
    The present disclosure has been made taking into consideration such situations and its object is to improve the design of a light emitting device using an organic electroluminescence panel. Summary [0006]
    In order to achieve the object, a light emitting device according to one aspect of the present disclosure comprises an organic electroluminescence panel in which a plurality of light emitting portions are arranged in a predetermined direction. The plurality of light emitting portions are configured so that their brightness is progressively decreased towards the predetermined direction.
    [0007]
    The plurality of light emitting portions may be configured such that their surfaces are progressively reduced towards the predetermined direction.
    [0008]
    The organic electroluminescence panel may have a power supply wiring for supplying power to the light emitting portions. The plurality of light emitting portions may be arranged such that their distances from the power supply wiring are progressively increased towards the predetermined direction.
    [0009]
    A non-light emitting portion between the plurality of light emitting portions may be configured to allow light to be transmitted therethrough. The light emitting device may further comprise a reflector disposed at a rear portion of the organic electroluminescence panel.
    [0010]
    The light emitting device may comprise a plurality of organic electroluminescence panels. The plurality of organic electroluminescence panels can be electrically connected in series.
    [0011]
    According to the present disclosure, it is possible to improve the design of a light emitting device using an organic electroluminescence panel.
    Brief description of the drawings [0012]
    Fig. 1 is a schematic front view of a vehicle lamp using a light emitting device according to an embodiment of the present disclosure.
    FIG. 2 is a schematic sectional view taken on a line A-A of the vehicle lamp shown in FIG. 1.
    Figs. 3A and 3B are views showing an example of a pattern to be applied to an electroluminescent portion.
    Fig. 4 is a view for explaining the arrangement of a power supply wiring for supplying power to the light emitting part of an organic electroluminescence panel.
    Figs. 5A and 5B are views for explaining a modification of the light emitting device.
    Figs. 6A-6C are views for explaining another modification of the light emitting device.
    Fig. 7 is a schematic front view of a vehicle lamp using a light emitting device according to another embodiment of the present disclosure.
    Fig. 8 is a schematic sectional view taken on a line B-B of an organic electroluminescence panel shown in Fig. 7.
    Fig. 9 is a view for explaining a light emitting state of the vehicle lamp according to the present embodiment.
    Fig. 10 is a schematic front view for explaining a configuration of a light emitting device according to another embodiment of the present disclosure.
    Fig. 11 is a sectional view taken on a line B-B of the light emitting device of Fig. 10.
    Fig. 12 is a view for explaining the connection between a power supply connector and an organic electroluminescence panel.
    Figs. 13A and 13B are views for explaining the principle of corrosion that occurs in a connection portion between the power supply connector and an electrode.
    Fig. 14 is a view for explaining a structure that is provided to prevent the occurrence of corrosion in the connection portion between the power supply connector and the electrode.
    Detailed description [0013]
    Hereinafter, a light emitting device according to an embodiment of the present disclosure and a vehicle lamp using the light emitting device are described in detail with reference to the drawings. Meanwhile, when a directional terminology such as "superior", "lower", "forward", "backward", "left", "right", "internal" and "external" is used here, this terminology refers to to the directions in a position in which a vehicle lamp is mounted on a vehicle. Further, since the respective drawings are intended to illustrate a positional relationship between respective elements, the respective drawings do not necessarily represent the true dimension relationship between the respective elements. Further, in the description of the respective embodiments, the same or corresponding components are designated by the same reference numbers and the repetition of their description is omitted where appropriate.
    [0014]
    Figure 1 is a schematic front view of a vehicle lamp 100 using a light emitting device 10 according to an embodiment of the present disclosure. FIG. 2 is a schematic sectional view taken on a line AA of the vehicle lamp 100 shown in FIG. 1. The light emitting device 10 illustrated in FIG. 1 is a rear light provided at a rear portion of the vehicle. 'a vehicle. Meanwhile, the light emitting device 10 may be used in a traffic light such as a stop light, a daytime running light and a clearance light.
    [0015]
    As shown in Fig. 1, the vehicle lamp 100 comprises a lamp body 102, a transparent cover 104 covering a front opening of the lamp body 102 and the light emitting device 10 provided in a lamp chamber 106 which is formed by the lamp body 102 and the lid 104.
    [0016]
    The light emitting device 10 comprises an organic electroluminescence panel 12 and a metal plate 14.
    [0017]
    The organic electroluminescence panel 12 is configured such that an anode 21, an organic layer 24 and a cathode 26 are laminated to a transparent glass substrate 23 and then sealed by a seal member 28. A transparent electrode such as that an electrode ΓΓΟ (indium-tin oxide or "Indium Tin Oxide" in English) is used as anode 21. A metal electrode such as an aluminum electrode is used as the cathode 26. When a voltage is applied to the organic layer 24 using the anode 21 and the cathode 26, positive holes are injected from the anode 21 and electrons are injected from the cathode 26. In addition, an organic compound The fluorescent is excited by the energy that is produced when the positive holes and the electrons are coupled together in the organic layer 24, thus emitting light. Among the light emitted in the organic layer 24, the light directed towards the anode 21 is emitted at the front of a lamp by the anode 21 and the glass substrate 23. On the other hand, among the light emitted in the organic layer 24, the light directed towards the cathode 26 is reflected in the cathode 26 and then emitted towards the front of the lamp through the organic layer 24, the anode 21 and the glass substrate 23. The organic layer 24 can comprise a phosphorescent organic compound. Instead of the glass substrate 23, another transparent substrate such as a resin substrate can be used.
    [0018]
    The metal plate 14 is provided on a rear surface 12b of the organic electroluminescence panel 12. "The back surface 12b" of the organic electroluminescence panel 12 refers to a surface (i.e., the surface of the electroluminescence element 12). sealing gasket 28) opposite to a light-emitting surface 12a of the organic electroluminescence panel 12. The metal plate 14 is fixed to the rear surface 12b of the organic electroluminescence panel 12 by an adhesive 30. The metal plate 14 has a part single plate-shaped and is formed with a size to cover the entire rear surface 12b of the organic electroluminescence panel 12. The metal plate 14 is not particularly limited, provided it has a high thermal conductivity. For example, the metal plate 14 can be made from aluminum or copper. In addition, preferably, the metal plate 14 is relatively thick (for example, 1 mm or more). The heat generated in the organic electroluminescence panel 12 is transmitted to the metal plate 14 and diffused in the planar direction of the metal plate 14. Thus, the temperature distribution variations of the organic electroluminescence panel 12 can be reduced.
    [0019]
    The organic electroluminescence panel 12 is attached to the lamp body 102 via a carrier 108 as a mounting member. The support 108 is provided with a magnetic element 110. The organic electroluminescence panel 12 is fixed on the support 108 by a magnetic force which is generated between the metal plate 14 and the magnetic element 110. As another method for fixing the metal plate 14 on the support 108, there is a method of using a double-sided tape. However, when the double-sided tape is used for fastening, it is difficult to uniformly apply pressure to effect bonding. Therefore, there is a possibility that the organic electroluminescence panel 12 is damaged. In this regard, in the method of fixing using the magnetic force as in the present embodiment, it is not necessary to apply pressure if the organic electroluminescence panel 12 and the support 108 are precisely aligned. Therefore, there is little possibility that the organic electroluminescence panel 12 is damaged. In addition, even when the organic electroluminescence panel 12 and the backing 108 are set in offset stance, the organic electroluminescence panel 12 and the backing 108 can detach and their position can be adjusted. In addition, the organic electroluminescence panel 12 can be easily exchanged in case of failure. At the same time, the organic electroluminescence panel 12 may be attached to the support 108 by other fastening means such as an adhesive, a screw and a tape.
    [0020]
    As shown in FIG. 1, the organic electroluminescence panel 12 of the light emitting device 10 according to the present embodiment comprises a plurality (six) of light emitting portions 20 (from the first light emitting portion 20a to the sixth portion light emitting 20f) separated from each other. Each of the light emitting portions 20 is formed in a U-shape, in front view. The light emitting portions 20 have a substantially similar shape and are formed such that the surfaces of the first light emitting portion 20a at the sixth light emitter 20f are progressively reduced in this order. Specifically, the surface of the first light-emitting portion 20a is the largest and the surfaces of the second light-emitting portion 20b, the third light-emitting portion 20c, the fourth light-emitting 20d, the fifth light-emitting light 20e and sixth light emitter 20f are gradually reduced in this order. The first light-emitting portion 20a at the sixth light-emitting portion 20f are arranged in this order towards the center direction of the organic electroluminescence panel 12. Specifically, the first light-emitting portion 20a having the largest area is positioned on the light-emitting side 20a. further outside, and the second light-emitting portion 20b, the third light-emitting portion 20c, the fourth light-emitting portion 20d, the fifth light-emitting portion 20e and the sixth light-emitting portion 20f are arranged in this order of the inner side of the first light emitting part 20a.
    [0021]
    In the organic electroluminescence panel 12, the regions between the respective light-emitting portions and a region within the sixth innermost light-emitting portion 20f are configured as non-light-emitting portions. 22 that do not emit light. In the present embodiment, the non-light-emitting portions 22 are formed by providing insulation layers 25 made with an organic material on the corresponding portions of the organic layer 24. Alternatively, the non-light emitting portions 22 may be formed by providing light shielding films on the corresponding portions of the light-emitting surface 12a of the organic electroluminescence panel 12.
    [0022]
    In the light emitting device 10 configured in the manner described above, light is emitted to the front of a lamp from the light emitting portions 20 when a voltage is applied to the organic layer 24 using the light emitting light. Anode 21 and cathode 26. Here, in the light emitting device 10 according to the present embodiment, the surfaces of the light emitting portions 20 are progressively reduced towards the center direction of the organic electroluminescence panel 12. Therefore, the The brightness of the light emitting portions 20 is progressively reduced towards the center direction of the organic electroluminescence panel 12. The human vision has a characteristic which is that a luminous thing is felt as being close and a dark thing is felt as being distant . Therefore, the emission of light where the brightness is gradually reduced towards such a predetermined direction can present a sensation of depth (three-dimensional appearance) to an observer, thus improving the design. In the light emitting device 10 according to the present embodiment, it should be noted that the flat organic electroluminescence panel 12 can be used to present a feeling of depth. That is, according to the present embodiment, the thickness reduction of the light emitting device 10 and the presence of the depth direction can be performed simultaneously.
    [0023]
    Figs. 3A and 3B are views showing an example of a pattern to be applied to the light emitting portions. In the light-emitting device 10 shown in FIGS. 1 and 2, a pattern of light-emitting regions may be formed in the light-emitting portions 20 (for example, the fourth light-emitting portion 20d, the fifth light-emitting portion 20th and sixth light-emitting portions 20f or the like) disposed therein. Fig. 3A shows a pattern of light emitting regions 31 formed in a dot shape and Fig. 3B shows a pattern of light emitting regions 33 formed in a stripe shape. By changing the ratio of the light emitting regions and the non-light emitting regions around, the brightness of the light emitting portions 20 can be regulated. In addition to adjusting the surfaces of the light-emitting portions, the above patterns are formed. In this way, the brightness can be effectively reduced to the center direction of the organic electroluminescence panel 12.
    [0024]
    Fig. 4 is a view for explaining the arrangement of a power supply wiring for supplying power to the light emitting portions 20 of the organic electroluminescence panel 12. The organic electroluminescence panel 12 includes a power supply wiring. anode current 40 electrically connected to the anode 21 (see Fig. 2) and cathode power supply wiring 41 electrically connected to the cathode 26 (see Fig. 2). The anode power supply wiring 40 and the cathode power supply wiring 41 are arranged along an outer periphery of the outermost first light emitter portion 20a. The anode power supply wiring 40 is disposed on three sides of the four sides of the outer periphery of the first light emitting portion 20a and the cathode power supply wiring 41 is disposed on the residual side. When the anode power supply wiring 40 and the cathode power supply wiring 41 are disposed in this arrangement, the distances from the anode power supply wiring 40 are progressively increased towards the direction Thus, by the voltage drop due to the resistance of the anode 21 which is a transparent electrode, the more the light emitting parts are positioned near the center of the organic electroluminescence panel 12, plus their brightness is low. In addition to reducing the surfaces of the light-emitting portions 20 progressively towards the center direction of the organic electroluminescence panel 12, such an arrangement of electrodes is used. Thus, the brightness is more effectively reduced towards the center direction of the organic electroluminescence panel 12, and therefore, it is possible to realize the light emission where a feeling of depth is further improved.
    [0025]
    Figs. 5A and 5B are views for explaining a modification of the light emitting device.
    [0026]
    Similar to the light emitting device 10 described above, the organic electroluminescence panel 12 of a light emitting device 50 shown in FIG. 5A also comprises a plurality (six) of light emitting portions 20 (of the first light-emitting portion 20a at the sixth light-emitting portion 20f) separated from each other. In this light emitting device 50, each of the light emitting portions 20 is formed in a circular shape, in front view. The light emitting portions 20 are formed so that the surfaces of the first light emitting portion 20a at the sixth light emitting portion 20f are progressively reduced in this order. Specifically, the surface of the first light-emitting portion 20a is the largest and the surfaces of the second light-emitting portion 20b, the third light-emitting portion 20c, the fourth light-emitting portion 20d, the fifth light-emitting portion 20e and sixth light-emitting portion 20f are progressively reduced in this order. As shown in Fig. 5A, the more the light emitting portions 20 are positioned near the center, the wider their widths may be. The first light-emitting portion 20a at the sixth light-emitting portion 20f are arranged concentrically toward the center direction of the organic electroluminescence panel 12. Specifically, the first light-emitting portion 20a having the largest surface area is positioned on the outermost side, and the second light-emitting part 20b, the third light-emitting part 20c, the fourth light-emitting part 20d, the fifth light-emitting part 20e and the sixth light-emitting part 20f are arranged concentrically on the inner side of the first light emitting part 20a. In addition, the anode power supply wiring 40 is disposed along an outer periphery of the first outermost light-emitting portion 20a. In the light emitting device 50 shown in Fig. 5A, the surfaces of the light emitting portions 20 are progressively reduced towards the center direction and the distances from the anode power supply wiring 40 are progressively increased towards the direction. Central. Thus, the brightness of the light-emitting portions can be progressively reduced towards the central direction, thus presenting a sensation of depth to an observer.
    [0027]
    The organic electroluminescence panel 12 of a light emitting device 51 shown in Fig. 5B also comprises a plurality (six) of light emitting portions 20 (from the first light emitting portion 20a to the sixth light emitting portion 20f) separated from each other. This light emitting device 51 is different from the light emitting device 50 shown in Fig. 5A, in that each light emitting part 20 is eccentrically arranged from the center of the organic electroluminescence panel 12. Also in the emitting device As shown in FIG. 5B, the brightness of the light emitting portions 20 can be progressively reduced towards the eccentric direction, thus presenting a sensation of depth to an observer.
    [0028]
    Figs. 6A-6C are views for explaining another modification of the light emitting device.
    [0029]
    An organic electroluminescence panel of a light emitting device 60 shown in Fig. 6a also includes a plurality (six) of light emitting portions 20 (from the first light emitting portion 20a to the sixth light emitting portion 20f) separated each other. In this light emitting device 60, each of the light emitting portions 20 is formed into an elongated rectangular shape, in front view. The light emitting portions 20 are formed such that the surfaces of the first light emitting portion 20a at the sixth light emitting portion 20f are progressively reduced in this order. Specifically, the surface of the first light-emitting portion 20a is the largest and the surfaces of the second light-emitting portion 20b, the third light-emitting portion 20c, the fourth light-emitting portion 20d, the fifth light-emitting portion 20e and sixth light-emitting portion 20f are progressively reduced in this order. The first light emitting part 20a at the sixth light emitting part 20f are arranged in that order towards the upper direction. Specifically, the first light-emitting portion 20a having the largest area is disposed on the lowest side, and the second light-emitting portion 20b, the third light-emitting portion 20c, the fourth light-emitting portion 20d, the fifth light-emitting portion 20e and sixth light-emitting portion 20f are arranged in that order on the upper side of the first light-emitting portion 20a. In addition, the anode power supply wiring 40 is disposed below the lowest first light emitter portion 20a. In the light emitting device 60 shown in FIG. 6A, the surfaces of the light emitting portions 20 are progressively reduced towards the upper direction and the distances from the anode power supply wiring 40 are progressively increased towards the direction higher. Thus, the brightness of the light emitting portions 20 can be progressively reduced towards the upper direction, thus presenting a sensation of depth to an observer.
    [0030]
    An organic electroluminescence panel of a light emitting device 61 shown in Fig. 6B also comprises a plurality (six) of light emitting portions 20 (from the first light emitting portion 20a to the sixth light emitting portion 20f) separated each other. This light emitting device 61 is different from the light emitting device 60 shown in Fig. 6A in that the light emitting portions are narrowed towards the upper direction. Also, in the light emitting device 61 shown in FIG. 6B, the brightness of the light emitting portions 20 can be progressively reduced towards the upper direction, thus presenting a sensation of depth to an observer.
    [0031]
    In an organic electroluminescence panel of a light emitting device 62 shown in Fig. 6C, the same light emitting portions 20 as those shown in Fig. 6B are arranged vertically symmetrically. In addition, anode power supply wiring 40 is provided on the upper and lower sides. In the light emitting device 62 shown in FIG. 6C, the brightness of the light emitting portions 20 can be progressively reduced towards the central direction, thus presenting a sensation of depth to an observer.
    [0032]
    Fig. 7 is a schematic front view of a vehicle lamp 700 using a light emitting device according to another embodiment of the present disclosure. Figure 8 is a schematic sectional view taken on a line B-B of the vehicle lamp 700 shown in Figure 7.
    [0033]
    As shown in Fig. 7, the vehicle lamp 700 comprises a first light emitting device 710 and a second light emitting device 720, which are provided in a lamp chamber 106 formed by a lamp body 102 and a lid 104. The first light emitting device 710 may be a tail light and the second light emitting device 720 may be a stop light.
    [0034]
    The first light emitting device 710 comprises an organic electroluminescence panel 712 and a reflector 713.
    [0035]
    The organic electroluminescence panel 712 is configured such that an anode 21, an organic layer 24 and a cathode 26 are laminated to a transparent glass substrate 23 and then sealed by a transparent seal member 28. A transparent electrode such that an electrode ΓΓΟ (indium-tin oxide or "Indium Tin Oxide" in English) is used as anode 21. A metal electrode such as an aluminum electrode is used as the cathode 26.
    [0036]
    Similarly to the embodiment shown in Fig. 1, the organic electroluminescence panel 712 comprises a plurality (six) of light emitting portions 20 (from the first light emitting portion 20a to the sixth light emitting portion 20f) separated each other. In the present embodiment, the plurality of light emitting portions 20 are formed by a plurality of cathodes 26 separated from each other. The portion of the organic layer 24 on which the cathode 26 is provided is configured as the light emitting portion 20 and its portion on which the cathode 26 is not provided is configured as the non-light emitting portion 22. In the organic electroluminescence panel 712, the non-light emitting portion 22 is configured as a transparent portion to allow light to be transmitted therethrough.
    [0037]
    The reflector 713 is disposed at the rear portion of the organic electroluminescence panel 712. The reflector 713 may be deposition-configured metal film such as aluminum on a base material. The surface of the reflector 713 is preferably greater than that of the organic electroluminescence panel 712.
    [0038]
    The second light emitting device 720 is disposed above the organic electroluminescence panel 712. The position of the second light emitting device 720 in a depth direction is preferably positioned between the organic electroluminescence panel 712 and the reflector 713. type of the second light emitting device 720 is not particularly limited. For example, the second light emitting device 720 may use a light emitting diode or a light bulb.
    [0039]
    Fig. 9 is a view for explaining an aspect of the light emission of the vehicle lamp 700 according to the present embodiment. Also in the present embodiment, the light emission where the brightness is progressively reduced towards the center direction of the organic electroluminescence panel 712 may present a sensation of depth to an observer. Further, in the present embodiment, the organic electroluminescence panel 712 is reflected on the reflector 713 and its visual image is visible through the transparent portion of the organic electroluminescence panel 712, so that it is possible to present another sense of depth to an observer. Further, in the present embodiment, a portion of light emitted by the second light emitting device 720 separated from the organic electroluminescence panel 712 is reflected several times between the cathode 26 of the organic electroluminescence panel 712 and the reflector 713. Next a part of the multiply reflected light is transmitted through the transparent part (i.e. the non-light emitting part 22) of the organic electroluminescence panel 12. In this way, it is possible to present a sensation of increased depth to an observer.
    [0040]
    Fig. 10 is a schematic front view for explaining a configuration of a light emitting device 900 according to another embodiment of the present disclosure. Fig. 11 is a sectional view taken on a line BB of the light emitting device 900 shown in Fig. 10. The light emitting device 900 according to the present embodiment comprises two organic electroluminescence panels (a first organic electroluminescence panel 911 and a second organic electroluminescence panel 912).
    [0041]
    As shown in FIG. 11, the first organic electroluminescence panel 911 is configured such that an anode 21a, an organic layer 24a, and a cathode 26a are laminated to a transparent glass substrate 23 and then sealed by a gasket element. sealing 28a. The first organic electroluminescence panel 911 includes anode current supply wiring 40a electrically connected to the anode 21a and a cathode power supply wiring 41a electrically connected to the cathode 26a. Similarly, the second organic electroluminescence panel 912 is configured such that an anode 21b, an organic layer 24b and a cathode 26b are laminated to the transparent glass substrate 23 common to the first organic electroluminescence panel 911 and then sealed. by a seal member 28b. The second organic electroluminescence panel 912 includes anode power supply wiring 40b electrically connected to the anode 21b and a cathode power supply wiring 41b electrically connected to the cathode 26b.
    [0042]
    Similarly to the embodiment shown in Fig. 1, the first organic electroluminescence panel 911 and the second organic electroluminescence panel 912 may have a plurality of light emitting portions separated from each other, respectively.
    [0043]
    The first organic electroluminescence panel 911 and the second organic electroluminescence panel 912 are arranged adjacent so that a space between them is as narrow as possible. The first organic electroluminescence panel 911 and the second organic electroluminescence panel 912 are electrically connected in series by a metal wiring 913. In addition, as shown in Fig. 10, the anode power supply wiring 40a, 40b and the cathode current supply wiring 41a, 41b are arranged symmetrically with respect to the center of the light emitting device 900.
    [0044]
    As shown in Fig. 10, the power supply of the light emitting device 900 is realized using a power supply connector 920. The power supply connector 920 may be formed with a flexible printed circuit board. A constant current circuit (not shown) is connected to the power supply connector 920.
    [0045]
    The power supply connector 920 is connected to one end of the anode power supply wiring 40a of the first organic electroluminescence panel 911 and one end of the cathode power supply wiring 41b of the second organic electroluminescence panel. 912. The power supply connector 920 and the power supply wiring may be interconnected by an anisotropic conductive adhesive. The current supplied from the power supply connector 920 to the anode power supply wiring 40a of the first organic electroluminescence panel 911 flows into the anode 21a, the organic layer 24a, the cathode 26a and the wiring harness. supplying the cathode current 41a of the first organic electroluminescence panel 911 and then flows into the wire 913. Next, the current flows into the anode current supply wiring 40b, the anode 21b, the organic layer 24b, the cathode 26b and the cathode power supply wiring 41b of the second organic electroluminescence panel 912 and then returns to the power supply connector 920.
    [0046]
    According to the light emitting device 900 of the first embodiment, the first organic electroluminescence panel 911 and the second organic electroluminescence panel 912 are electrically connected in series. With this configuration, the output of the constant current circuit for supplying power to the light emitting device 900 may be a single output. As a result, the circuit scale can be reduced compared to the case where the first organic electroluminescence panel 911 and the second organic electroluminescence panel 912 are connected in parallel. This configuration is advantageous for miniaturization and cost reduction. Further, according to the light emitting device 900 of the first embodiment, a single current power connector 920 can be used to bring current to two organic electroluminescence panels. This configuration is advantageous for the miniaturization of the light emitting device 900.
    [0047]
    Since organic electroluminescence elements generally have a different nominal current depending on the surfaces, the plurality of organic electroluminescence panels with different surfaces can not be connected in series. The reason for this is that the current of the same value flows in the plurality of organic electroluminescence panels and thus may exceed the rated current when the organic electroluminescence panels are connected in series. Therefore, it is preferable that the light emitting surfaces of the first organic electroluminescence panel 911 and the second organic electroluminescence panel 912 are identical.
    [0048]
    In a vehicle lamp using a plurality of light sources, when any of the light sources are disconnected, and therefore the prescribed light distribution is not satisfied, the law requires that all other light sources be off. According to the light emitting device 900 of the present embodiment, a plurality of organic electroluminescence panels are connected in series, and thus the law described above is naturally satisfied. In addition, there is no need to provide a circuit for detecting disconnection, which is advantageous for miniaturization and cost reduction of the light emitting device 900.
    [0049]
    Fig. 12 is a view for explaining the connection between the power supply connector 920 and the organic electroluminescence panel. As described above, the power supply connector 920 is connected to the anode power supply wiring 40a and the cathode power supply wiring 41b. The power supply connector 920, the anode power supply wiring 40a and the cathode power supply wiring 41b are interconnected by an anisotropic conductive adhesive 500. The anisotropic conductive adhesive 500 contains a plurality of conductive balls 501. When the power supply connector 920 is compressed against the anode power supply wiring 40a and the cathode power supply wiring 41b, the conductive balls 501 are crushed. Next, a terminal 921 of the power supply connector 920 is electrically connected to the anode power supply wiring 40a and the cathode power supply wiring 41b.
    [0050]
    Figs. 13A and 13B are views for explaining the principle of corrosion occurring in a connection portion between the power supply connector and the electrode. In carrying out a high temperature and high humidity durability test for the organic electroluminescence panel, the present inventors have discovered that corrosion is likely to occur in the connection portion between the connector terminal 921 of the connector. power supply and cathode current supply wiring 41b of the organic electroluminescence panel. The present inventors have studied the cause of corrosion and found that corrosion (i.e., electrolytic corrosion) occurs due to the difference in ionization tendency between gold (Au) of the plated terminal 921 and the cathode current supply wiring 41b (chromium (Cr) or molybdenum (Mo)). The tendency to ionization is expressed by
    Cr (-0.744)> Mo (-0.138) >> Au (+1.498). Figure 13A shows a cathode side. In the cathode side, the direction of the current and the direction of the ionization current are the same and therefore corrosion (i.e. Cr precipitation or the like) is likely to occur. Figure 13B shows a cathode side. In the anode side, the direction of the current and the direction of the ionization current are opposite, and so corrosion is less likely to occur.
    [0051]
    Fig. 14 is a view for explaining a structure that is provided to prevent the occurrence of corrosion in the connection portion between the power supply connector and the electrode. In this structure, the anisotropic conductive adhesive 500 is arranged to cover all the terminals 921 of the power supply connector 920. Thus, it is possible to prevent the entry of moisture between the terminals 921 of the power connector. 920 power supply and the electrode, thereby removing corrosion. In addition, preferably, a moisture impermeable coating is applied over the entire connecting portion between the power supply connector and the electrode, and thus the moisture is more likely to be prevented from entering between the terminals 921 of the power supply connector 920 and the electrode.
    [0052]
    In the previous part, the present disclosure has been described with reference to the embodiments. It will be appreciated by those skilled in the art that these embodiments are illustrative, the combinations of the respective components or methods can be varied in a variety of ways and such modifications are within the scope of the present disclosure.
    权利要求:
    Claims (5)
    [1" id="c-fr-0001]
    A light emitting device (10, 50, 60, 61, 62, 710, 900) comprising an organic electroluminescence panel (12, 712, 911, 912) in which a plurality of light emitting portions (20a-20f) is arranged in a predetermined direction, wherein: the plurality of light emitting portions (20a-20f) are configured such that their brightness is progressively decreased towards the predetermined direction.
    [2" id="c-fr-0002]
    The light emitting device according to claim 1, wherein: the plurality of light emitting portions (20a-20f) are configured so that their surfaces are progressively reduced towards the predetermined direction.
    [3" id="c-fr-0003]
    The light emitting device according to claim 1 or 2, wherein: the organic electroluminescence panel has a power supply wiring (40) for supplying power to the light emitting portions, and the plurality of light emitting portions (20a-20f) is arranged such that their distances from the power supply wiring are progressively increased towards the predetermined direction.
    [4" id="c-fr-0004]
    The light emitting device (710) according to any one of claims 1 to 3, wherein: a non-light emitting portion (22) between pluralities of light emitting portions (20a-20f) is configured to enable transmitting light therethrough, and the light emitting device further comprises a reflector (713) disposed at a rear portion of the organic electroluminescence panel (712).
    [5" id="c-fr-0005]
    The light emitting device (900) according to any one of claims 1 to 4, wherein: the light emitting device comprises a plurality of organic electroluminescence panels (911, 912), and the plurality of organic electroluminescence panels are electrically connected in series.
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    同族专利:
    公开号 | 公开日
    JP6587508B2|2019-10-09|
    US20170133348A1|2017-05-11|
    CN107062113A|2017-08-18|
    US10643972B2|2020-05-05|
    DE102016221654A1|2017-05-11|
    JP2017092146A|2017-05-25|
    FR3043444B1|2019-07-26|
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    法律状态:
    2017-10-11| PLFP| Fee payment|Year of fee payment: 2 |
    2018-10-10| PLFP| Fee payment|Year of fee payment: 3 |
    2018-11-30| PLSC| Publication of the preliminary search report|Effective date: 20181130 |
    2019-09-27| PLFP| Fee payment|Year of fee payment: 4 |
    2020-10-13| PLFP| Fee payment|Year of fee payment: 5 |
    2021-10-18| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2015217716A|JP6587508B2|2015-11-05|2015-11-05|Light emitting device|
    JP2015-217716|2015-11-05|
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