JP2020107508A - Vehicle lighting fixture - Google Patents

Abstract

To provide a vehicle lighting fixture which uses a transparent organic EL panel to reduce luminance unevenness at lighting.SOLUTION: A vehicle lighting fixture (100) has an organic EL panel (101) which includes a translucent substrate (10) arranged to face a transparent member (2), a translucent anode (20), an organic substance layer (30) and a cathode (40) laminated in the above order. The organic EL panel (101) has a light-emitting part (72) which emits light toward the transparent member (2) and a non-light-emitting part (74) which does not emit light arranged in a stripe shape, and is configured to have a current flow between the anode (20) and the cathode (40) only at the light-emitting part (72). At least one of the anode (20) and the cathode (40) has, at least at a part of the outer periphery thereof, wiring members (26, 46) which are electrically connected to the feeding terminals (21, 41) of the organic EL panel. The wiring members (26, 46) are composed of material having lower resistance than an electrode on which the wiring members are provided.SELECTED DRAWING: Figure 3

Description

The present invention relates to a vehicular lamp, and more particularly to a vehicular lamp using an organic EL (Electro Luminescence).

BACKGROUND ART Conventionally, a vehicular lamp is known in which an organic EL panel is arranged inside a rear window of a vehicle and is used as a marker lamp such as a high mount stop lamp or a tail lamp.

When the organic EL panel is arranged inside the rear window, it is necessary to ensure the visibility by allowing the organic EL panel to pass through in order to prevent the rear visibility from being degraded by the organic EL panel. For this purpose, a vehicular lamp has been proposed in which a transparent anode and a metal cathode formed in a stripe shape are used so as to emit light in a stripe shape and the transparency is ensured (for example, Patent Document 1). 1).

JP, 2005-195173, A

However, the vehicular lamp using the transparent anode and the striped cathode has a problem in that the brightness of the light emitting portion decreases toward the center during lighting and uneven brightness occurs.

As a result of the analysis, the luminance unevenness is caused by the resistance value from the power feeding portion of the transparent anode to the outer periphery of the transparent anode and the sheet resistance value of the transparent anode itself. It was found that it occurs due to the voltage drop toward the stripes and the voltage drop from the power supply terminal to both ends of the stripe and from both ends of the stripe to the center of the stripe due to the resistance value of the stripe cathode.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a technique capable of reducing luminance unevenness during lighting in a vehicular lamp using an organic EL panel having transparency. It is in.

In order to solve the above problems, a vehicle lamp according to an aspect of the present invention is a vehicle lamp that is mounted on a transparent member, and a translucent substrate that is arranged to face the transparent member, A translucent first electrode disposed on the substrate, an organic material layer disposed on the first electrode, and a second electrode disposed on the organic material layer are laminated. An organic EL panel is provided, and the organic EL panel has a light emitting portion that emits light toward the transparent member and a non-light emitting portion that does not emit light, which are arranged in a stripe pattern, and the first light emitting portion is provided only in the light emitting portion. A current is configured to flow between an electrode and the second electrode, and at least one of the first and second electrodes has a power supply terminal of the organic EL panel on at least a part of an outer periphery thereof. A wiring member for electrical connection is provided, and the wiring member is made of a material having a resistance lower than that of an electrode on which the wiring member is provided.

In addition, in the above aspect, at least one of the first electrode and the second electrode further includes an auxiliary electrode that is thinner than the stripe of the light emitting portion within a range of the stripe of the light emitting portion, and the auxiliary electrode is It is also preferable that the resistance is lower than that of the electrode including the auxiliary electrode.

A vehicular lamp according to another aspect of the present invention is a vehicular lamp attached to a transparent member, the translucent substrate being arranged to face the transparent member, and the transparent substrate being arranged on the substrate. An organic EL panel including a transparent first electrode, an organic layer disposed on the first electrode, and a second electrode disposed on the organic layer. In the EL panel, a light emitting portion that emits light toward the transparent member and a non-light emitting portion that does not emit light are arranged in a stripe shape, and the first electrode and the second electrode are provided only in the light emitting portion. A current flows between the first electrode and the second electrode, and at least one of the first electrode and the second electrode has an auxiliary electrode thinner than the stripe in a light emitting region including the stripe of the light emitting unit. The auxiliary electrode is made of a material having a resistance lower than that of an electrode including the auxiliary electrode.

In addition, in the above aspect, the second electrode may be a translucent cathode, and the second electrode may include the auxiliary electrode.

Further, in the above aspect, the auxiliary electrode may be arranged on the electrode provided with the auxiliary electrode, along the stripe of the light emitting portion, over the entire length of the stripe of the light emitting portion.

Further, in the above aspect, the auxiliary electrode is disposed between the first electrode and the organic material layer, and the organic EL panel prevents a short circuit between the first electrode and the second electrode. May be provided with an insulating layer.

Further, in the above aspect, the wiring member may be thicker than the stripe of the light emitting portion.

Further, in the above aspect, the organic EL panel includes a stripe insulating layer between the first electrode and the organic material layer, and the stripe insulating layer is formed in a stripe shape, whereby the light emitting unit and the The non-light emitting portion may be arranged in a stripe shape, and the auxiliary electrode may be arranged at a position corresponding to the stripe insulating layer.

In addition, in this specification, "translucency" means a property of transmitting at least a part of visible light, and includes transparency.

According to the above aspect, by providing at least one of the wiring member and the auxiliary electrode having a resistance lower than that of the light extraction electrode, the resistance of the electrode can be reduced and the voltage drop can be reduced. In a vehicular lamp that uses a panel, it is possible to reduce uneven brightness during lighting.

FIG. 1 is a front view of a vehicle rear part showing a state in which a vehicle lamp according to a first exemplary embodiment of the present invention is mounted. (A) is a front view of an organic EL panel of a vehicular lamp according to the same embodiment, in which a light shielding layer is omitted, and (B) is a rear view thereof. It is an exploded perspective view explaining the laminated structure of the organic EL panel. FIG. 4 is a sectional end view (portion) of the organic EL panel taken along the line IV-IV in FIG. 2B. FIG. 6 is a cross-sectional end view of an organic EL panel that constitutes a vehicular lamp according to a second embodiment of the present invention. FIG. 6 is a sectional end view of an organic EL panel that constitutes a vehicle lamp according to a third exemplary embodiment of the present invention. It is a cut surface end view of the organic EL panel which comprises the vehicle lamp which concerns on the 4th Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited thereto.

Note that the drawings are for the purpose of explaining the positional relationship of each member, and do not show the actual dimensional relationship of each member. Further, in the description of each embodiment, the same constituent elements are designated by the same reference numerals, and redundant description will be appropriately omitted.

In addition, the following embodiments apply the vehicle lighting device of the present invention (hereinafter, also simply referred to as “lighting device”) to a high mount stop lamp arranged inside a rear window of a vehicle (cabin side). Here is an example:

In the present specification, terms indicating directions such as “front” and “rear” are based on the direction in which the vehicular lamp is mounted on the vehicle, and specifically, the irradiation direction of the vehicular lamp, unless otherwise specified. Before.

<First Embodiment>
FIG. 1 is a front view of a vehicle 1 equipped with a vehicle lighting device 100 according to a first embodiment of the present invention, as seen from a rear portion. As shown in FIG. 1, the lamp 100 is formed in a rectangular thin plate shape that is horizontally long when viewed from the front, and is arranged inside the vehicle along a transparent member 2 that is a rear window of the vehicle 1.

The lamp 100 includes an organic EL panel 101 and a highly transparent double-sided tape (not shown) as a mounting structure for attaching the organic EL panel 101 to the transparent member 2. The mounting structure is not limited to the double-sided tape, but may be a transparent silicon sheet or other known fixing means.

2A is a front view of the organic EL panel 101 in which a light shielding layer 60 described later is omitted, and FIG. 2B is a rear view thereof. Further, FIG. 3 is an exploded perspective view showing a laminated structure of the organic EL panel 101. It should be noted that the light shielding layer 60 and the power supply terminals 21 and 41 are not shown in FIG. 3. Further, FIG. 4 is an end view of a cut surface taken along the line IV-IV in FIG.

As shown in FIGS. 3 and 4, the organic EL panel 101 as a whole has a translucent substrate 10 formed in a horizontally long rectangular shape in a front view, and a translucent anode 20 arranged on the substrate 10. An organic material layer 30 disposed on the anode 20 and formed in a substantially similar shape that is smaller than the anode 20, a cathode 40 disposed on the organic material layer 30, and a transparent layer covering the anode 20, the organic material layer 30, and the cathode 40. It is configured as a laminated body of an optical sealing member 50 and a light shielding layer 60 arranged on the sealing member 50. A region where the anode 20, the organic material layer 30, and the cathode 40 overlap each other forms a rectangular light emitting region 70.

The substrate 10 is a resin or glass translucent substrate. The substrate 10 is attached to the transparent member such that the surface (light emission surface) 10 a facing the surface on which the anode 20 is laminated faces the transparent member 2.

The anode 20 is a transparent electrode such as ITO (indium tin oxide) or silver. The anode 20 is formed in a shape similar to that of the light emitting region 70. On the anode 20, a plurality of stacked bodies 24 of the first auxiliary electrode 22 and the insulating layer 23 extend in parallel at the predetermined intervals along the lateral direction of the light emitting region 70 over the entire length thereof. However, it is arranged at the center in the width direction of the stripe of the light emitting portion 72 which will be described later.

A first wiring member 26, which is electrically connected to the power supply terminal 21 of the organic EL panel 101, is arranged on the outer peripheral edge portion of the anode 20 with a predetermined width over the entire circumference.

The first auxiliary electrode 22 is an electrode made of a material having a resistance lower than that of the anode 20, and is appropriately selected according to the material of the anode. For example, it may be a metal electrode of aluminum, gold, copper or the like, but is not particularly limited. Further, the first auxiliary electrode 22 and the insulating layer 23 are formed to be thinner than the stripe of the light emitting section 72 described later.

The insulating layer 23 is, for example, a film of an inorganic material such as silicon oxide or silicon nitride, or a film of an organic material such as an organic polymer.

The first wiring member 26 is an electrode made of a material having a resistance lower than that of the anode 20, and functions as a so-called bus line. The first wiring member 26 is appropriately selected according to the material of the anode, and is preferably a metal electrode of aluminum, gold, copper, or the like, but is not particularly limited. Further, the first wiring member 26 is electrically connected to the first auxiliary electrode 22. Further, the first wiring member 26 is formed thicker than the stripe of the light emitting section 72 described later.

The organic material layer 30 contains a known fluorescent organic compound as an organic EL material, and is composed of an electron transport layer, a light emitting layer, and a hole transport layer. Alternatively, as the organic material layer 30, a material containing a phosphorescent organic compound may be used.

The cathode 40 is, for example, a transparent electrode of ITO or silver. The cathode 40 is formed in a rectangular shape which is substantially similar to the light emitting region 70 as a whole, but a band (stripe) of a plurality of cathodes 40 of equal width is formed in the light emitting region 70 by a metal mask vapor deposition method. It is formed in stripes extending in parallel along the lateral direction of the light emitting region 70 at intervals.

On the cathode 40, a plurality of second auxiliary electrodes 42, which will be described later, extend over the entire length of the stripe of the cathode 40 so as to match the center of each stripe of the cathode 40 in the width direction.

A second wiring member 46, which is electrically connected to the power supply terminal 41 of the organic EL panel 101, is formed around the entire outer peripheral edge of the cathode 40 so as to connect the ends of the stripe of the cathode 40. Are arranged with a predetermined width. Further, the second wiring member 46a is arranged at a central position in the lateral direction of the light emitting region 70 in which each stripe of the cathode 40 extends so as to connect the stripes orthogonal to each stripe.

The second auxiliary electrode 42 is an electrode made of a material having a resistance lower than that of the cathode 40, and is appropriately selected according to the material of the cathode 40. For example, it may be a metal electrode of aluminum, gold, copper or the like, but is not particularly limited.

The second wiring members 46, 46a are electrodes made of a material having a resistance lower than that of the cathode 40, and function as so-called bus lines. The second wiring members 46 and 46a are appropriately selected according to the material of the cathode 40, and may be metal electrodes such as aluminum, gold, and copper, but are not particularly limited. The second wiring members 46 and 46a are electrically connected to the cathode 40 and the second auxiliary electrode 42. The second wiring members 46 and 46a are formed thicker than the stripes of the light emitting section 72, which will be described later.

An insulating layer 43 for preventing a short circuit between the second wiring members 46, 46a and the organic material layer 30 is provided between the cathode 40 and the organic material layer 30 at a position corresponding to the second wiring members 46, 46a. Are arranged. The insulating layer 43 is, for example, a film of an inorganic material such as silicon oxide or silicon nitride or a film of an organic material such as an organic polymer, and is a transparent insulator.

The sealing member 50 is formed by adhering a transparent inorganic film such as silicon nitride or a transparent resin film having a barrier function, and prevents moisture and oxygen from entering the organic layer from the outside.

The light shielding layer 60 is, for example, a transparent adhesive film printed with black paint. Alternatively, it may be formed by printing directly on the sealing member 50. Alternatively, aluminum may be vapor-deposited.

The light shielding layer 60 is formed in a stripe shape wider than the stripe of the cathode 40 at a position on the sealing member 50 corresponding to the cathode 40 formed in a stripe shape.

The organic EL panel 101 includes the substrate 10, the anode 20, the first auxiliary electrode 22, the insulating layer 23, the laminated body 81 of the first wiring member 26, the laminated body 82 of the organic material layer 30 and the insulating layer 43, and the cathode. 40, the second auxiliary electrode 42, and the second wiring member 46 are formed into a laminated body 83, respectively, and then the laminated bodies 81 to 83 are laminated to manufacture.

Next, the light emission mechanism of the organic EL panel 101 will be described.
The anode 20 and the cathode 40 respectively include power supply terminals 21 and 41 connected to a power source. When a voltage is applied to the organic material layer 30 from the anode 20 and the cathode 40 by driving the power supply, holes are injected from the anode 20 and electrons are injected from the cathode 40 into the organic material layer 30. Then, the organic substance is excited by the energy generated when the holes and the electrons are combined in the organic substance layer 30, and emits red light when the excited state returns to the ground state again.

Since the cathode 40 is formed in a stripe shape, as shown in FIG. 4, in the light emitting region 70, a portion where the anode 20, the organic material layer 30, and the cathode 40 are stacked and a portion where the cathode 40 is not stacked are The stripes are arranged corresponding to the 40 stripes. Therefore, when the power is turned on, the former becomes a light emitting portion 72 in which a current flows from the anode 20 to the cathode 40 through the organic material layer 30 to emit light, and the latter becomes a non-light emitting portion 74. In this way, the lamp 100 emits light in stripes when it is turned on.

Of the light emitted from the organic material layer 30, the light traveling toward the anode 20 passes through the anode 20 and is emitted from the emission surface 10a of the substrate 10 toward the transparent member 2, that is, toward the front.

On the other hand, of the light emitted from the organic material layer 30, the light traveling toward the cathode 40 passes through the cathode 40 and is shielded by the light shielding layer 60. That is, the light shielding layer 60 prevents light from being emitted rearward (toward the passenger compartment).

In addition, part of the light traveling toward the anode 20 may be reflected by the emission surface 10a and travel backward. However, since the light shielding layer 60 is configured to be wider than the light emitting portion 72 at the position corresponding to the stripe of the cathode 40, such light is also shielded by the light shielding layer 60 (FIG. 4). In this way, the light emitted by the lamp 100 is less likely to leak to the passenger compartment side, and dazzling of the driver can be prevented.

In the lamp 100, the back surface of the light emitting part 72 is covered with the light shielding layer 60, but the non-light emitting part 74 is made of a member having a light-transmitting property. It is possible to secure rear visibility from the driver's seat.

The effects of this embodiment will be described.
Usually, in the anode, a voltage drop occurs from the power supply terminal to the outer periphery of the anode (both ends of the stripe of the light emitting portion) due to the resistance value of the anode itself. In the present embodiment, by providing the first wiring member 26 on the outer peripheral edge portion of the anode 20, the anode 20 is electrically connected to the first wiring member 26, and a portion of the anode 20 close to the power supply terminal 21. There is almost no voltage difference between the two ends of the stripe of the light emitting portion 72 located on the outer peripheral edge of the anode 20, and the voltage drop that occurs from the power supply terminal 21 to the both ends of the stripe of the light emitting portion 72 is reduced, resulting in uneven brightness. It can be reduced.

Similarly, on the cathode side, a voltage drop normally occurs from the power supply terminal to both ends of the stripe of the light emitting portion. In the present embodiment, the second wiring member 46 having a low electric resistance is provided on the outer peripheral edge portion of the entire cathode 40, so that the cathode 40 is electrically connected to the second wiring member 46 and the power supply terminal of the cathode 40 is provided. There is almost no voltage difference between the portion close to 41 and both ends of the stripe of the light emitting portion 72, and the voltage drop generated from the power supply terminal 41 toward both ends of the stripe of the light emitting portion 72 can be reduced, and uneven brightness can be reduced. ..

Further, a voltage drop similarly occurs from both ends of the stripe toward the center. In the present embodiment, the second wiring member 46a is arranged so as to connect the stripes at a central position in the lateral direction of the light emitting region 70 in which the stripes of the cathode 40 extend and intersect the stripes at right angles. There is. With this structure, the central portion of each stripe of the cathode 40 is electrically connected to the second wiring member 46a, and the portion of the cathode 40 near the power supply terminal 41 and the stripe of the cathode 40 (the light emitting portion 72). The voltage difference between the stripe and the central portion in the length direction is almost eliminated, and the voltage drop occurring from both ends of the stripe of the light emitting portion 72 toward the central portion can be reduced, and uneven brightness can be reduced.

The thickness and arrangement of the first wiring member 26 and the second wiring members 46 and 46a can be appropriately set according to the material of the electrode provided with each wiring member, the shape of the light emitting region, and the like. However, it is preferable that the thickness of the wiring members 26, 46, 46a is thicker than the stripe of the light emitting portion 72 because the effect of reducing the resistance can be sufficiently obtained.

Furthermore, in the anode, a voltage drop occurs from the outer circumference of the anode toward the center. In the present embodiment, by providing the first auxiliary electrode 22 in the light emitting region 70, the resistance of the anode 20 is reduced, the voltage drop occurring from the outer periphery of the anode 20 toward the central portion is reduced, and the uneven brightness is reduced. be able to. When the first auxiliary electrode 22 is provided in the stripe of the light emitting portion 72 along the extending direction of the light emitting portion 72 as in the present embodiment, both ends of the stripe and the central portion in the length direction of the stripe are formed. It is particularly preferable because the voltage difference between the two is reduced.

In the cathode 40, a voltage drop occurs from both ends of the stripe of the cathode 40 (light emitting portion 72) toward the center of the stripe. In the present embodiment, by providing the second auxiliary electrode 42 in the light emitting region 70, the resistance of the cathode 40 is reduced, the voltage drop generated from both ends of the stripe of the cathode 40 toward the central portion is reduced, and uneven brightness is caused. It can be reduced. When the second auxiliary electrode 42 is provided along the stripe over the entire length of the stripe of the light emitting portion 72 as in the present embodiment, it is between the both ends of the stripe and the central portion in the length direction of the stripe. This is particularly preferable because the voltage difference of 1 is reduced.

Further, the first auxiliary electrode 22 and the second auxiliary electrode 42 are thinner than the stripe of the light emitting portion 72. Since the first auxiliary electrode and the second auxiliary electrode are metal electrodes, light from the outside may be reflected to dazzle the driver of the following vehicle when not lit, but the stripes of the light emitting unit 72 are included. By making it thinner than that, it becomes difficult to dazzle. Since the second auxiliary electrode does not block all the light emitted from the organic layer 30, it is possible to irradiate the light forward. Further, since the first auxiliary electrode 22 and the second auxiliary electrode 42 are arranged at positions corresponding to the light shielding layer 60 in the thickness direction of the organic EL panel 101, the transparency of the lamp 100 is adversely affected. Does not reach.

<Second Embodiment>
Similar to the lamp 100, the vehicle lamp 200 according to the second embodiment of the present invention is a high mount stop lamp having a rectangular shape in front view, which is attached to a rear window of a vehicle. The lamp 200 includes a mounting structure (not shown) and an organic EL panel 201, similar to the lamp 100. FIG. 5 is an end view of the cross section of the organic EL panel 201 corresponding to FIG. 4 according to the first embodiment.

As shown in FIG. 5, the organic EL panel 201 includes a substrate 10, a light-transmissive anode 220, an organic material layer 30 formed in a substantially similar shape smaller than the anode 220, a cathode 240, and an anode as a whole. A light-transmitting sealing member 50 that covers 220, the organic material layer 30, and the cathode 240, and a light-shielding layer 60 are stacked in this order to form a laminated body.

Each layer of the organic EL panel 201 is made of the same material as each layer of the organic EL panel 101. An overlapping region of the anode 220, the organic material layer 30, and the cathode 240 forms a rectangular light emitting region 70 that is substantially similar to the front shape of the lamp 200.

Specifically, the anode 220 is formed in a rectangular shape that is substantially similar to the light emitting region 70 as a whole, but a plurality of strips (stripes) of the anodes of equal width are formed in the light emitting region 70 by a method such as photolithography. ) Are formed in parallel in the form of stripes extending along the lateral direction of the light emitting region 70.

On the anode 220, a laminated body 24 of a plurality of first auxiliary electrodes 22 and an insulating layer 23 extends along the respective stripes of the anode in the center of the stripes of the anode 220 in the width direction. The insulating layer 23 ensures insulation between the first auxiliary electrode 22 and the organic material layer 30 side, and short-circuits with the cathode 240 even if a portion of the first auxiliary electrode 22 that is not covered with the organic material layer 30 occurs. Prevent.

Further, on the outer peripheral edge of the anode 220, the first wiring member 26, which is a bus line electrically connected to the power supply terminal 41 of the organic EL panel 201, connects the end portions of the stripes of the anode 220, It is arranged with a predetermined width over the entire circumference.

On the other hand, the cathode 240 is formed in a rectangular shape that is substantially similar to the light emitting region 70. Further, on the cathode 240, a plurality of second electrodes thinner than the stripe of the anode extend in the lateral direction of the lamp 200 at positions corresponding to the stripes of the anode 220.

A second wiring member 46, which is a bus line electrically connected to the power supply terminal 41 of the organic EL panel, is arranged at the outer peripheral edge of the cathode 240 with a predetermined width over the entire circumference.

As described above, in the lighting device 200, the anode 220 is formed in a stripe shape, so that the portion corresponding to the stripe of the anode 220 emits light when current flows from the anode 220 to the cathode 240 through the organic material layer 30. The portion that constitutes 72 and the anode 220 is not formed constitutes the non-light emitting portion 74 and emits light in a stripe shape.

Further, similarly to the first embodiment, the anode 220 and the cathode 240 are provided with the first and second auxiliary electrodes 22, 42 and the first and second wiring members 26, 46. The resistance in each electrode can be reduced, and as a result, the voltage drop in each electrode can be reduced and the uneven brightness can be reduced.

Further, in the present embodiment, the first and second auxiliary electrodes 22 and 42 are arranged in the light emitting section 72, as in the first embodiment. Therefore, the first auxiliary electrode and the second auxiliary electrode are arranged at positions corresponding to the light shielding layer 60 in the thickness direction of the organic EL panel, and do not adversely affect the transparency of the lamp 200.

<Third Embodiment>
Similarly to the lamps 100 and 200, the vehicle lamp 300 according to the third embodiment of the present invention is also a high mount stop lamp that is attached to a rear window of the vehicle and has a rectangular shape in a front view. The lamp 300 also includes a mounting structure (not shown) similar to the lamp 100 and an organic EL panel 301. FIG. 6 is an end view of the cross section of the organic EL panel 301 corresponding to FIG. 4 according to the first embodiment.

As shown in FIG. 6, the organic EL panel 301 is formed as a whole into a substrate 10, a light-transmissive anode 20, an insulating layer (stripe insulating layer) 80, and a substantially similar shape that is smaller than the anode 20. The organic material layer 30 thus formed, the cathode 240, the translucent sealing member 50 covering the anode 20, the organic material layer 30, and the cathode 240, and the light shielding layer 60 disposed on the sealing member 50 are laminated in this order. It is configured as a laminated body.

The layers, wiring members, and auxiliary electrodes of the organic EL panel 301 are made of the same materials as the layers, wiring members, and auxiliary electrodes of the organic EL panel 101 according to the first embodiment except the insulating layer 80. An overlapping region of the anode 20, the organic material layer 30, and the cathode 240 forms a rectangular light emitting region 70 that is substantially similar to the front shape of the lamp 300.

In addition, the anode 20 and the cathode 240 each include a first wiring member 26 and a second wiring member 46.

The insulating layer 80 is, for example, a film of an inorganic material such as silicon oxide or silicon nitride, or a film of an organic material such as an organic polymer, and is a transparent insulator. The insulating layer 80 is formed into a stripe shape in which the strips (stripes) of the insulating layers 80 having the same width are parallel to each other in the light emitting region 70 by a method such as photolithography and extend in the lateral direction of the light emitting region 70. Has been formed.

As described above, in the vehicular lamp 300, the insulating layer 80 is provided, and the insulating layer 80 is formed in a stripe shape, so that in the portion of the organic EL panel 301 corresponding to the stripe of the insulating layer 80, from the anode 20 to the cathode. At the position where the current does not flow to 240 and the stripe of the insulating layer 80 is not formed, the current flows from the anode 20 to the cathode 240 through the organic material layer 30, and the portion corresponding to the insulating layer 80 becomes the non-light emitting portion 74. The portion where the insulating layer 80 is not formed becomes the light emitting portion 72 and emits light in a stripe shape.

A first auxiliary electrode 322, which is thinner than the width of the stripe of the light emitting portion 72, is provided between the anode 320 and the insulating layer 80. The first auxiliary electrode 322 is arranged at a position corresponding to the stripe of the insulating layer 80, and extends in the lateral direction of the lamp 300 at predetermined intervals.

In addition, on the cathode 240, a plurality of second auxiliary electrodes 42 are extended along the stripes of the light emitting portion 72 at a portion where the insulating layer 80 is not formed, that is, in the widthwise center of the stripe of the light emitting portion 72. Existence

According to the above configuration, the first auxiliary electrode 322 is arranged in the non-light emitting portion 74 and is not arranged in front of the organic layer 30 that emits light. Therefore, the light path of the light emitted from the organic material layer 30 is not obstructed, and the light amount at the time of lighting is not reduced.

Further, the arrangement of the first auxiliary electrode 322 in the non-light emitting portion 74 is not particularly limited, but as shown in FIG. 6, the light emitting portion 72 is provided as much as possible while ensuring insulation of the first auxiliary electrode 322 from the organic layer 30. It is preferable to dispose it so as to be close to the above from the viewpoint of reducing the resistance of the anode 20 of the light emitting portion 72.

Note that it is particularly preferable that the first auxiliary electrode 322 is arranged at the position where the light shielding layer 60 is formed in the non-light emitting portion 74, since it does not affect the transparency of the lamp 300 when it is not lit. ..

The first auxiliary electrodes 322 are arranged on both sides of the stripe of the light emitting section 72 so as to extend along the stripe of the light emitting section 72. As a result, the resistance of the anode facing the stripe of the light emitting portion 72 is reduced from both sides of the stripe, so that there is almost no difference in voltage within the stripe, and the uneven brightness can be reduced more effectively.

<Fourth Embodiment>
Similarly to the lamps 100 to 300, the vehicle lamp 400 according to the fourth embodiment of the present invention is also a high mount stop lamp having a rectangular shape in a front view, which is attached to a rear window of the vehicle 1. The lamp 400 includes a mounting structure (not shown) for mounting on the rear window and an organic EL panel 401. FIG. 7 is an end view of the cross section of the organic EL panel 401 corresponding to FIG. 4 according to the first embodiment.

As shown in FIG. 7, the organic EL panel 401 is also formed as a whole into the substrate 10, the translucent anode 20, the insulating layer (stripe insulating layer) 80, and a substantially similar shape that is smaller than the anode 20. The organic layer 430 thus formed, the cathode 240, the translucent sealing member 50 covering the anode 20, the organic layer 430 and the cathode 240, and the light shielding layer 60 disposed on the sealing member 50 are laminated in this order. It is configured as a laminated body.

The layers, wiring members, and auxiliary electrodes of the organic EL panel 401 are made of the same material as the layers, wiring members, and auxiliary electrodes of the organic EL panel 301 according to the third embodiment. In addition, the overlapping region of the anode 20, the organic material layer 430, and the cathode 240 forms a rectangular light emitting region 70 that is substantially similar to the front shape of the lamp 300.

The anode 20 and the cathode 240 each include the first wiring member 26 and the second wiring member 46, as in the first embodiment.

The organic material layer 430 is formed into a stripe shape in which the bands (stripes) of the organic material layers 430 having a plurality of equal widths are parallel to each other in the light emitting region 70 by a technique such as photolithography and extend in the lateral direction of the light emitting region 70. Has been formed.

The insulating layer 80 has a stripe shape extending in the lateral direction of the light emitting region 70 so that the bands (stripe) of the insulating layers 80 having the same width in the light emitting region 70 are complementary to the stripes of the organic layer 430. Is formed in.

As described above, in the vehicle lamp 400, the organic material layer 430 and the insulating layer 80 are formed in a complementary stripe shape, so that the anode 20 is provided in the portion of the organic EL panel 401 corresponding to the stripe of the insulating layer 80. No current flows from the cathode 240 to the cathode 240. On the other hand, in the portion where the stripe of the insulating layer 80 is not formed and the stripe of the organic layer 430 is formed, a current flows from the anode 20 to the cathode 240 through the organic layer 430. Therefore, the portion corresponding to the insulating layer 80 becomes the non-light emitting portion 74, and the portion corresponding to the organic layer 430 where the insulating layer 80 is not formed becomes the light emitting portion 72 and emits light in a stripe shape.

A first auxiliary electrode 422, which is thinner than the width of the stripe of the light emitting portion 72, is provided between the insulating layer 80 and the cathode 240. The first auxiliary electrodes 422 are arranged along the stripes of the insulating layer 80 on both sides in the width direction of the stripes of the insulating layer 80 in the thickness direction of the organic EL panel 401. Further, the first auxiliary electrode 422 is arranged in the non-light emitting portion 74 as close to the light emitting portion 72 as possible.

According to the above configuration, the first auxiliary electrode 422 is ensured to be insulated from the anode 20, and is electrically connected to the cathode 240. Therefore, in the present embodiment, both the first and second auxiliary electrodes 422 and 42 function as auxiliary electrodes of the cathode 240, and the voltage drop of the cathode 240 can be effectively reduced.

In addition, as in the third embodiment, the first auxiliary electrode is arranged in the non-light emitting portion, and is not arranged in front of the organic layer 30 that emits light. Therefore, the optical path of the light emitted from the organic material layer 430 is not obstructed, and the light amount at the time of lighting is not reduced.

The embodiment is not limited to the above, and may be configured as follows, for example.

The first wiring member and the second wiring member do not have to surround the entire circumference of the outer peripheral portion of the electrode on which they are respectively provided, and may be arranged at least at a part of the outer peripheral portion. For example, the second wiring member may be arranged so as to connect both ends of all stripes instead of the entire circumference of the cathode.

It is not always necessary to provide the wiring member on both the anode and the cathode, and it is sufficient to provide the wiring member on at least either the anode or the cathode.

The auxiliary electrode does not necessarily have to be provided on both the anode and the cathode, and may be provided on at least one of the anode and the cathode.

The cathode is not limited to the transparent electrode, and a metal electrode may be used. In this case, the cathode may be formed wider than the stripe of the light emitting portion and the light shielding layer may be omitted.

The first and second auxiliary electrodes are not limited to be arranged along the stripes of the light emitting portion, but may be arranged in a grid pattern over the entire light emitting region.

The first and second wiring members are not limited to metal electrodes, but may be FPC (Flexible printed Circuits) wiring in which a copper foil is attached to a base film of polyethylene terephthalate, for example.

The stripes of the light emitting portion are not limited to the direction along the lateral direction of the light emitting region, and may be arranged along the longitudinal direction. However, if the stripes of the light emitting portion are arranged so as to extend in the direction along the widthwise direction, the length of the stripes can be relatively shortened, so that the voltage drop from both ends of the stripe electrode to the central portion is reduced. Therefore, it is preferable.

The transparent member to which the vehicular lamp is attached is not limited to the flat rear window, and may be a transparent member having a three-dimensional curved surface. In this case, the mounting structure may include an optical member, a transparent double-sided tape, and an intervening member such as a silicon sheet.

2 Transparent member 10 Substrate 20, 220, 320 Anode (first electrode)
21, 41 Power supply terminals 22, 322, 422 First auxiliary electrode (auxiliary electrode)
23 Insulating Layer 26 First Wiring Member (Wiring Member)
30,430 Organic substance layer 40,240 Cathode (second electrode)
42 Second auxiliary electrode (auxiliary electrode)
46, 46a Second wiring member (wiring member)
70 light emitting region 72 light emitting portion 74 non-light emitting portion 80 insulating layer (stripe insulating layer)
100, 200, 300, 400 Vehicle lamp 101, 201, 301, 401 Organic EL panel

Claims (8)

A vehicular lamp attached to a transparent member,
A transparent substrate arranged to face the transparent member,
A transparent first electrode disposed on the substrate,
An organic layer disposed on the first electrode,
A second electrode arranged on the organic material layer, and an organic EL panel in which the second electrode is laminated,
In the organic EL panel, a light emitting portion that emits light toward the transparent member and a non-light emitting portion that does not emit light are arranged in a stripe shape, and the first electrode and the second electrode are provided only in the light emitting portion. It is configured so that an electric current flows between the electrodes,
At least one of the first and second electrodes includes a wiring member electrically connected to a power supply terminal of the organic EL panel on at least a part of an outer periphery thereof,
The vehicle lighting device, wherein the wiring member is made of a material having a resistance lower than that of an electrode provided with the wiring member. At least one of the first electrode and the second electrode further includes an auxiliary electrode within the range of the stripe of the light emitting unit, the auxiliary electrode being thinner than the stripe of the light emitting unit.
The vehicle lamp according to claim 1, wherein the auxiliary electrode has a lower resistance than an electrode including the auxiliary electrode. A vehicular lamp attached to a transparent member,
A transparent substrate arranged to face the transparent member,
A transparent first electrode disposed on the substrate,
An organic layer disposed on the first electrode,
An organic EL panel including a second electrode arranged on the organic layer is laminated,
In the organic EL panel, a light emitting portion that emits light toward the transparent member and a non-light emitting portion that does not emit light are arranged in a stripe shape, and the first electrode and the second electrode are provided only in the light emitting portion. It is configured so that an electric current flows between the electrodes,
At least one of the first electrode and the second electrode includes an auxiliary electrode thinner than the stripe in a light emitting region including the stripe of the light emitting unit,
The vehicular lamp, wherein the auxiliary electrode is made of a material having a lower resistance than an electrode including the auxiliary electrode. The second electrode is a transparent cathode,
The vehicular lamp according to claim 2, wherein the second electrode includes the auxiliary electrode. The said auxiliary electrode is arrange|positioned along the stripe of the said light emission part on the back side of the electrode in which the said auxiliary electrode is provided, and over the full length of the stripe of the said light emission part, The Claims 2-4 characterized by the above-mentioned. The vehicle lamp according to any one of the above. The auxiliary electrode is disposed between the first electrode and the organic material layer,
The vehicular lamp according to any one of claims 2 to 5, wherein the organic EL panel includes an insulating layer for preventing a short circuit between the first electrode and the second electrode. The vehicular lamp according to any one of claims 1, 2, 4 to 6, wherein the wiring member is thicker than the stripe of the light emitting portion. The organic EL panel includes a stripe insulating layer between the first electrode and the organic material layer,
By forming the stripe insulating layer in a stripe shape, the light emitting portion and the non-light emitting portion are arranged in a stripe shape,
The vehicular lamp according to claim 2, wherein the auxiliary electrode is arranged at a position corresponding to the stripe insulating layer in the thickness direction of the organic EL panel.