JP5799492B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device using a light emitting element such as an organic electroluminescence (EL) element.

There is known a light emitting device in which a plurality of light emitting elements are arranged in an effective area on a substrate, and various wirings are arranged in a peripheral area surrounding the effective area. Each light emitting element is sandwiched between a first electrode and a second electrode, and has a light emitting layer formed of a light emitting material such as an organic EL material. In many cases, the second electrode is a common electrode provided in common to the plurality of light emitting elements, and is provided over the entire effective region.
However, a voltage drop occurs in the surface of the electrode due to the resistance of the electrode itself, and the potential supplied to the light-emitting element varies depending on the position on the substrate, and the luminance of the light-emitting element may vary depending on the position. Therefore, conventionally, an auxiliary electrode formed of a material having a resistance lower than that of the common electrode and electrically connected to the common electrode is provided to reduce the resistance of the common electrode (for example, Patent Document 1).

JP 2002-352963 A

Many of the lighting devices using the light emitting elements as described above have a large light emitting area as compared with the light emitting device described in Patent Document 1. Therefore, when patterning the auxiliary cathode in the illumination device, a deposition mask larger than the deposition mask for the conventional light emitting device is used.
The production of the auxiliary electrode will be described below with reference to the drawings. FIG. 8 is a simplified diagram showing a conventional method for manufacturing an auxiliary electrode. (A) is a figure which forms auxiliary electrode 150 in substrate 10 using vapor deposition mask 300, and (b) is a figure in which auxiliary electrode 150 is formed in substrate 10 using vapor deposition mask 301.

As shown in FIG. 8A, when a large deposition mask 300 is used, there are a plurality of factors depending on the deflection due to heat during deposition of the auxiliary electrode 150 and the in-plane distribution of the mask processing accuracy when the deposition mask 300 is manufactured. Variations in the line widths (T1 and T2) of the auxiliary electrode 150 are likely to occur. For this reason, the resistance value of each auxiliary electrode 150 varies depending on the resistance of the plurality of auxiliary electrodes 150 themselves. As a result, when a current is supplied to the light emitting elements to light them, the currents flowing through the respective light emitting elements connected to the plurality of auxiliary electrodes 150 differ due to variations in voltage drop amounts of the plurality of auxiliary electrodes 150. For this reason, there exists a possibility that the brightness | luminance of a light emitting element may vary with the position in the surface of an illuminating device.
Therefore, conventionally, as illustrated in FIG. 8B, the line-shaped auxiliary electrode 150 has been formed by using the vapor deposition mask 301 smaller than the vapor deposition mask 300 a plurality of times.
In this case, in the joint portion C of the line-shaped auxiliary electrode 150, a precise position compared to the case where the vapor deposition mask 300 is used so that the breakage or thinning of the auxiliary electrode 150 due to misalignment of the vapor deposition mask 301 does not occur. A mechanism capable of matching is used.

  On the other hand, the common electrode is uniformly formed in a region covering the entire effective region. Therefore, an error in alignment can be allowed as compared with the auxiliary electrode 150. Therefore, the alignment error of the common electrode is more problematic than the auxiliary electrode 150. Therefore, it is desirable to secure a sufficient width of the peripheral region (so-called “frame region”) on the substrate so as to be able to absorb the error of the common electrode, which hinders downsizing of the device.

Although not shown in the drawing, an insulating layer is provided between the first electrode, the common electrode, and the auxiliary electrode to insulate the common electrode and the auxiliary electrode from the first electrode. However, when the insulating layer includes a step, the electrode may be broken or cracked in the upper layer portion overlapping the step. Since the resistance value of the electrode increases at the location where the disconnection or crack occurs, the luminance unevenness of the light emitting element becomes remarkable.
This invention is made | formed in view of the situation mentioned above, and makes it a solution subject to provide the illuminating device which can suppress the brightness nonuniformity of a light emitting element while reducing the frame area | region of an illuminating device.

  In order to solve at least a part of the above problems, the present invention can be realized as the following forms or application examples.

  Application Example 1 An illumination device according to this application example includes an effective region in which a light emitting element is disposed on a substrate and a peripheral region surrounding the effective region. The light emitting element includes both a first electrode and a second electrode. A light emitting layer between the auxiliary electrode electrically connected to the second electrode, an upper layer disposed on the first electrode, and from the second electrode and the auxiliary electrode An insulating layer having a portion disposed in a lower layer, and the second electrode covers the effective region and is formed to overlap the peripheral region, and the auxiliary electrode is a part of the peripheral region. In the peripheral region, the end of the second electrode is located inside the end of the auxiliary electrode and the end of the insulating layer in the plane of the substrate.

In the lighting device of the present invention, the end of the auxiliary electrode is disposed outside the end of the common electrode. The auxiliary electrode is formed as a line-shaped auxiliary electrode by using a small mask a plurality of times. For this reason, it is desirable to form using a highly accurate alignment mechanism. On the other hand, since the common electrode is formed so as to overlap with the region covering the entire effective region, alignment accuracy is not required as much as the auxiliary electrode when forming the common electrode. That is, the auxiliary electrode is often formed with a smaller error than the common electrode.
Therefore, according to the present invention, the frame region can be reduced in accordance with the error of the auxiliary electrode, compared with the configuration in which the end of the common electrode is arranged outside the end of the auxiliary cathode, and the apparatus can be downsized. It becomes possible. The auxiliary electrode is configured to have a lower resistance than the second electrode. In particular, the auxiliary electrode is preferably formed of a material having a lower resistance than the second electrode.

  Application Example 2 In the illumination device according to the application example described above, the second electrode is disposed below the auxiliary electrode.

  Since the common electrode is often formed of a brittle material or thinly formed, the common electrode may be disconnected or cracked due to the step difference at the end of the insulating layer. However, in the present invention, since the end of the common electrode is disposed inside the end of the insulating layer, disconnection and cracks in the common electrode are prevented. Therefore, it is possible to prevent an increase in resistance value due to disconnection or cracking. Accordingly, luminance unevenness of the light emitting element can be suppressed. In a preferred aspect of the present invention, it is preferable that the second electrode is disposed below the auxiliary electrode. According to this aspect, since the auxiliary electrode can be made thicker, the resistance of the auxiliary electrode itself can be further lowered, so that luminance unevenness can be suppressed.

Application Example 3 The illumination device according to this application example is an illumination device having an effective area in which a light emitting element is disposed on a substrate and a peripheral area surrounding the effective area, and is provided corresponding to the light emitting element. The first electrode, the second electrode provided in common to the light emitting element, the light emitting layer interposed between the first electrode and the second electrode, and the auxiliary electrically connected to the second electrode An electrode, and an insulating layer that insulates between the second electrode or the auxiliary electrode and the first electrode, and the second electrode includes the entire effective region and at least a part of the peripheral region. Provided in the first region, and the insulating layer overlaps the first region in the entire effective region, and protrudes in the first direction from the first region in the peripheral region. The auxiliary electrode is provided in the peripheral region. The first region is provided so as to pass through the inside of the first region and the outside of the first region and the inside of the second region to reach the outside of the second region. It is characterized by.

  In the above illumination device, the auxiliary electrode is also provided in a region outside the first region where the common electrode is provided. Therefore, the end of the auxiliary electrode is disposed outside the end of the common electrode. In addition, a highly accurate alignment mechanism is used for forming the auxiliary electrode. On the other hand, since the common electrode is uniformly formed in a region covering the entire effective region, alignment accuracy is not required as much as the auxiliary electrode when forming the common electrode. Therefore, since the error of the auxiliary electrode is smaller than that of the common electrode, according to the present invention, the frame region is set according to the error of the auxiliary electrode as compared with the configuration in which the end of the common electrode is arranged outside the end of the auxiliary cathode. The size of the apparatus can be reduced.

  Furthermore, in the above-described lighting device, the first region in which the common electrode is provided is disposed on the inner side of the second region in which the insulating layer is provided. Therefore, in the portion where the end of the insulating layer and the common electrode overlap, an increase in resistance value due to disconnection or crack in the common electrode can be prevented in advance. Accordingly, luminance unevenness of the light emitting element can be suppressed.

  Application Example 4 In the illumination device according to Application Example 3, the auxiliary electrode includes a plurality of individual electrodes provided in stripes along the first direction so as to extend from the inside to the outside of the effective region. It is characterized by having.

A lighting apparatus according to Application Example 5 Application Example 4, characterized in that before Symbol peripheral region further having a connection electrode for connecting the plurality of individual electrodes with one another.

  Application Example 6 In the illumination device according to Application Example 5, the connection electrode is arranged so that an end of the insulating layer in the first direction overlaps the connection electrode.

  Application Example 7 In the illumination device according to any one of Application Examples 3 to 6, the second electrode power supply line for supplying a potential to the second electrode intersects the first direction. The second electrode power line is provided in the peripheral region, and is electrically connected to the auxiliary electrode.

  Application Example 8 In the lighting device according to the application example, the second electrode power line is provided outside the first region.

It is a schematic plan view which shows a part of structure of the illuminating device which concerns on 1st Embodiment of this invention. It is a fragmentary sectional view of the D-D 'line in the illuminating device of FIG. In a comparative example, it is a figure which shows a mode that the crack generate | occur | produced in the common electrode. It is a fragmentary sectional view of the illuminating device which concerns on 2nd Embodiment of this invention. It is a partial simplified sectional view of the illuminating device which concerns on the modification of this invention. It is a partial simplified sectional view of the illuminating device which concerns on the modification of this invention. It is the outline of the layout of the illuminating device which concerns on the modification of this invention. It is a simplification figure showing the manufacturing method of the conventional auxiliary electrode.

Embodiments according to the present invention will be described below with reference to the accompanying drawings. In the drawings, the ratio of dimensions of each part is appropriately changed from the actual one.
<A-1: First Embodiment>
FIG. 1 is a schematic plan view showing a part of the configuration of the illumination device 1 according to the first embodiment of the present invention. As shown in FIG. 1, the lighting device 1 includes a substrate 10 and a flexible substrate 20. A connection terminal is formed at the end of the substrate 10, and the connection terminal and the connection terminal formed on the flexible substrate 20 are in a film shape containing conductive particles called ACF (anisotropic conductive film). Crimped and fixed via an adhesive. The flexible substrate 20 is provided with a power supply circuit 200, and various power supply voltages are supplied to the substrate 10 via the flexible substrate 20.

  The substrate 10 is provided with an effective region A and a peripheral region B outside thereof (that is, between the substrate 10 or the outer periphery of the substrate 10 and the effective region A). In the peripheral region B, the end of the insulating layer 35 that insulates the first electrode 76 and the second electrode (not shown), the end of the common electrode 72, and the second electrode power line 140 are arranged.

  The effective area A includes an OLED (organic light emitting diode) element and receives power from the first electrode 76, the common electrode 72, and the auxiliary electrode 150.

  Further, as shown in FIG. 1, a second electrode power line 140 is formed on the outer peripheral side of the peripheral region B (that is, between the substrate 10 or the outer periphery of the substrate 10 and the peripheral region B). The second electrode power supply line 140 is a wiring for supplying a power supply voltage (in this example, Vss: ground level) to the second electrode (cathode) of the light emitting element as will be described later.

  The light emitting element 70 includes a light emitting functional layer (including a light emitting layer) 74 sandwiched between a first electrode 76 (anode) and a common electrode 72 (cathode) (see FIG. 2). As shown in FIG. 1, the common electrode 72 is formed in a region (first region) that extends over the entire effective region A and a part of the peripheral region B. In addition, the auxiliary electrode 150 that connects the common electrode 72 and the second electrode power supply line 140 is connected in the peripheral region B. The auxiliary electrode in this specification is a conductor that overlaps and is electrically connected to the common electrode 72 and reduces the resistance of the common electrode 72.

  The illuminating device 1 of this embodiment is configured in the form of top emission, and light from the light emitting functional layer 74 is emitted through the common electrode 72. The common electrode 72 is made of a transparent material. Meanwhile, a conductive metal is used for the auxiliary electrode 150 described above.

FIG. 2 is a partial cross-sectional view taken along the line DD ′ in the lighting device 1 of FIG. The insulating layer 35 is provided between the first electrode 76 and the second electrode power line 140 and the auxiliary electrode 150 or the common electrode 72, and serves to insulate them. The insulating layer 35 overlaps the above-described first region (region where the common electrode 72 is formed) in the entire effective region A, and protrudes in the first direction in the peripheral region B from the first region. Is provided in the area.
Specifically, in the present embodiment, in FIG. 1, in both the left and right sides of the four sides of the substrate 10 where the second electrode power line 140 is disposed, the second region is more substrate than the first region. 10 protrudes outward in the plane. As shown in FIG. 2, for simplicity of explanation, the element layer 30 is shown collectively including a base protective layer (not shown) and a protective insulating layer (not shown) formed on the second electrode power line 140. . The second electrode power supply line 140 is formed in the upper layer portion of the element layer 30. As described above, the upper surface of the second electrode power supply line 140 functions as a contact region with the upper electrode.

  As the material of the insulating layer 35, for example, an acrylic or polyimide organic polymer material is used. In this case, a photosensitive material for patterning may be mixed in an organic resin and patterned by exposure in the same manner as in the photoresist. Alternatively, the insulating layer 35 may be formed from an inorganic material such as silicon oxide or silicon oxynitride by chemical vapor deposition (CVD), and the upper surface thereof may be planarized by etching or the like. When an inorganic material is formed by a chemical vapor deposition method, the film thickness is 1 μm or less and is almost uniform, so the upper surface is easily affected by the unevenness of the lower layer, while the organic resin is coated. Therefore, the film thickness can be increased to about 2 to 3 μm, and the upper surface thereof is hardly affected by the unevenness of the lower layer, so that it is suitable for the material of the insulating layer 35. However, an inorganic material such as silicon oxide or silicon oxynitride can be used for the insulating layer 35 as long as a certain degree of unevenness is allowed. As described above, since the insulating layer needs to have a predetermined thickness, a step may be generated in the peripheral region.

  A common electrode 72 and an auxiliary electrode 150 are formed on the insulating layer 35. The first electrode 76 in this embodiment is an anode of the light emitting element 70. Moreover, as a material of the 1st electrode 76 which is an anode, a material with a large work function is desirable, for example, nickel, gold | metal | money, platinum etc. or those alloys are suitable. Since these materials have reflectivity, the light emitted from the light emitting functional layer 74 is reflected toward the common electrode 72. In this case, the auxiliary electrode 150 is also formed from these materials.

Further, as the first electrode 76, a first layer having light transmissivity and conductivity made of an oxide conductive material such as ITO (indium tin oxide), IZO (indium zinc oxide), or ZnO ₂ having a high work function. And a second layer made of a reflective metal such as aluminum, and the first layer may be provided on the light emitting functional layer 74 side.

  The auxiliary electrode 150 is formed in a stripe shape in the effective region A, and in the peripheral region B, the second region where the insulating layer 35 is formed protrudes beyond the first region where the common electrode 72 is formed ( In this embodiment, on both the left and right sides of the substrate 10, it passes through the inside of the first area, the outside of the first area, and the inside of the second area, and outside the second area. It is formed to reach. In the peripheral region B, the auxiliary electrode 150 is connected to the second electrode power line 140 through a contact hole formed in the insulating layer 35.

  Next, a light emitting functional layer 74 including at least a light emitting layer is formed on the first electrode 76. An organic EL material is used for the light emitting layer. The organic EL material may be a low molecular material or a high molecular material. As another layer constituting the light emitting functional layer 74, a hole injection layer, a hole transport layer, an electron transport layer, an electron injection layer, a hole block layer, and a part or all of the electron block layer may be provided. .

Next, the common electrode 72 (second electrode) is formed so as to cover the auxiliary electrode 150 and the light emitting functional layer 74 over the effective region A and the peripheral region B. The common electrode 72 is translucent, and light from the light emitting element 70 passes through the common electrode 72 and is emitted in the upper direction in the drawing. In order for the common electrode 72 of this embodiment to function as the cathode of all the light emitting elements 70, the common electrode 72 is formed of a material having a low work function so that electrons can be easily injected.
For example, aluminum, calcium, magnesium, lithium or the like or an alloy thereof. In addition, it is desirable that this alloy uses a material having a low work function and a material capable of stabilizing the material. For example, an alloy of magnesium and silver is suitable. When these metals or alloys are used for the common electrode 72, the thickness may be reduced in order to obtain translucency.

The common electrode 72 (second electrode) includes a first layer made of a material having a low work function, or a material having a low work function and a material that stabilizes the material, ITO (indium tin oxide), Even if the first layer is provided on the light emitting functional layer side including a light transmissive and conductive second layer made of an oxidized conductive material such as IZO (indium zinc oxide) or ZnO _2. Good. An oxidized conductive material such as ITO, IZO, or ZnO ₂ is a dense material and has a low gas permeability. If the common electrode 72 is formed of such a material, since the common electrode 72 is formed over the effective region A and the peripheral region B, the light emitting functional layer 74 in the effective region A is protected from the outside air, and deterioration thereof is suppressed. Is done. Thus, if the common electrode 72 (second electrode) includes the second layer, the common electrode 72 is superior in light transmittance and conductivity as compared with the material forming the first layer. The power supply impedance of 72 can be greatly reduced, and the light extraction efficiency from the light emitting functional layer can be improved. The common electrode 72 (second electrode) includes a first layer made of a material having a low work function, a material that stabilizes the material, and a second layer made of the above-described oxidized conductive material. Thus, it is possible to prevent the first layer and the second layer from reacting and deteriorating the electron injection efficiency.

  Next, a sealing film 80 is formed so as to cover the common electrode 72 and the auxiliary electrode 150. For the sealing film 80, for example, an inorganic material having a low gas permeability such as silicon oxynitride or silicon oxide having high transparency and good moisture resistance is used. The sealing film 80 is not formed on the outer edge of the substrate 10. At this outer edge, a seal 90 is bonded onto the substrate 10, and a transparent sealing substrate (counter substrate) 110 is bonded to the upper part. The For example, the seal 90 may be an adhesive, or a spacer for holding the counter substrate 110 may be joined by an adhesive.

As shown in FIG. 2, an insulating layer 35 is formed above the second electrode power line 140, and an end E <b> 2 of the insulating layer 35 is formed from an end E <b> 3 inside the contact region of the second electrode power line 140. Is even more inside. An auxiliary electrode 150 is formed in a region between the upper surface of the insulating layer 35 and the upper surface of the element layer 30 between the end E2 and the end E3 of the insulating layer 35 and a contact region.
As a result, the auxiliary electrode 150 is in contact with and overlapped with the second electrode power line 140 and is electrically connected to the second electrode power line 140. In the illustrated example, the end E4 of the auxiliary electrode 150 coincides with the outer end of the contact region. However, it does not have to coincide with each other, and the auxiliary electrode 150 may be formed so as to cover the contact region. . In other words, the end E4 of the auxiliary electrode may be positioned further outside than the outer end of the contact region.
In this specification, “inside” and “outside” indicate relative positions in the substrate surface when the end E5 of the substrate 10 is used as a reference. Therefore, for example, “the end E1 is inside the end E2” indicates that the distance between the end E1 and the end E5 of the substrate 10 is longer than the distance between the end E2 and the end E5.

  A common electrode 72 is formed on the auxiliary electrode 150. The end E1 of the common electrode 72 is formed so as to be located inside the end E2 of the insulating layer 35. Further, the end E4 of the auxiliary electrode 150 is formed to be located outside the end E1 of the common electrode 72. As described above, after the first electrode 76 and the second electrode power supply line 140 are formed, the light emitting functional layer 74 is formed, and the auxiliary electrode 150 is formed, the light emitting functional layer 74 is covered. A common electrode 72 is formed.

As described above, the auxiliary electrode 150 is made of a conductive metal. As described above, it is desirable that the auxiliary electrode 150 is formed using a high-precision alignment mechanism so that the auxiliary electrode 150 does not become disconnected or narrower than other auxiliary electrode widths at the joint between the auxiliary electrodes 150.
On the other hand, since the common electrode 72 is formed of a transparent material, the common electrode 72 is uniformly formed in the effective region A so as to cover the light emitting element 70 in the effective region A. For this reason, the common electrode 72 can be formed even if an electrode having a lower accuracy than the alignment mechanism used for forming the auxiliary electrode 150 is used. However, when the common electrode 72 is formed using an alignment mechanism with low accuracy, the position of the end E1 of the common electrode 72 may vary.

For example, an error range of the position of the end E1 of the common electrode 72 is t1, and an error range of the position of the end E4 of the auxiliary electrode 150 is t2. When an alignment mechanism with higher accuracy is used for the auxiliary electrode 150, t1> t2. Further, when a single alignment mechanism having an accuracy required for forming the auxiliary electrode 150 is used for both the auxiliary electrode 150 and the common electrode 72, t1 = t2.
Therefore, it is unlikely that the error t2 of the auxiliary electrode 150 is larger than the error of the common electrode 72. Even if t1 <t2 in the latter case, the high-precision alignment mechanism is used. The error is not a problem. Therefore, in the present embodiment, the end E4 of the auxiliary electrode 150 is configured to be located outside the end E1 of the common electrode 72.

  According to this configuration, the distance from the position E4max at which the error of the auxiliary electrode 150 is maximum on the end E5 side of the substrate 10 (the position when the end E4 is closest to the end E5 side of the substrate 10) to the end E5 is considered. Thus, the width of the peripheral region B (that is, the “frame region”) can be determined. Therefore, the frame region can be reduced as compared with the case where the end E1 of the common electrode 72 to which a larger error is allowed is arranged outside the end E4 of the auxiliary electrode 150. That is, it is possible to reduce the influence of the accuracy of the alignment mechanism used for forming the common electrode 72 on the width of the frame region. Note that the end E2 is such that the position E1max where the error of the common electrode 72 is maximum on the end E5 side of the substrate 10 is inside the position E4max where the error of the auxiliary electrode 150 is maximum on the end E5 side of the substrate 10. It is desirable to determine the reference position of the end E4 (position when there is no error).

FIG. 3 shows a case where the common electrode 72 is formed so as to overlap the end E2 of the insulating layer 35 as a comparative example. As shown in FIG. 3, in this comparative example, the end E <b> 1 of the common electrode 72 is disposed outside the end E <b> 2 of the insulating layer 35. As described above, the insulating layer 35 is often formed thick in order to flatten the underlying unevenness. Therefore, the end E2 of the insulating layer 35 is a large step.
On the other hand, the common electrode 72 is formed of a thin film material such as ITO, for example. For this reason, in the configuration shown in the comparative example, a crack I as shown in FIG. 3 may occur in the common electrode 72 due to the influence of the step at the end E2 of the insulating layer 35. When the crack I occurs, the resistance value increases at the crack portion, so that the value of the current flowing at the portion where the crack I occurs and the portion where the crack I does not occur are different and the voltage drop amount is different.
However, in the present embodiment, since the end E1 of the common electrode 72 is disposed inside the end E2 of the insulating layer 35, disconnection and cracks in the common electrode 72 are prevented. Therefore, it is possible to prevent an increase in resistance value due to disconnection or cracking. Accordingly, it is possible to suppress luminance unevenness of the light emitting element 70.

<B: Second Embodiment>
Next, a lighting device according to a second embodiment of the present invention will be described. In the lighting device 2 </ b> A shown in FIG. 4, the auxiliary electrode 150 is formed on the common electrode 72 so as to be in surface contact, and the sealing film 80 is formed so as to cover the auxiliary electrode 150 and the common electrode 72. The lighting device 2A is the same as the lighting device 1 (FIG. 3) of the first embodiment except that the common electrode 72 is formed below the auxiliary electrode 150. Therefore, the description is omitted as appropriate.

The outline of the manufacturing process of the lighting device 2A is as follows.
The first electrode 76 and the second electrode power line 140 are formed. Thereafter, the insulating layer 35 is formed above the first electrode 76, and the light emitting functional layer 74 is formed in the space above the first electrode 76. Further, a transparent common electrode 72 is formed over the effective area A and the peripheral area B. Thereafter, the auxiliary electrode 150 is formed, and the sealing film 80 is formed.
However, the sealing film 80 is not formed on the outer edge of the substrate 10, and the seal 90 is bonded on the substrate 10 and the transparent sealing substrate 110 is bonded on the upper edge at the outer edge.

As shown in FIG. 4, in the lighting device 2 </ b> A, the end E <b> 1 of the common electrode 72 is formed inside the end E <b> 2 of the insulating layer 35 and is formed inside the end E <b> 4 of the auxiliary electrode 150. Therefore, the same effect as the first embodiment can be obtained.
By the way, when forming the common electrode 72 after forming the auxiliary electrode 150 as shown in FIG. 3, the common electrode 72 may be disconnected if the auxiliary electrode 150 is made thicker than the common electrode 72. .
As shown in FIG. 4, since the auxiliary electrode 150 is formed after forming the common electrode 72, the common electrode 72 is not disconnected at the step of the auxiliary electrode 150, and the auxiliary electrode 150 is compared with the configuration of FIG. Can be formed thick. Therefore, since the resistance of the auxiliary electrode 150 can be lowered as compared with the configuration of FIG. 3, the luminance unevenness can be reduced.

<C: Modification>
(1) In the first and second embodiments, by covering the upper layer of the common electrode 72 or the auxiliary electrode 150 with the sealing film 80, the element layer 30, the second electrode power line 140, the insulating layer 35, the common layer Although the layer structure including the electrode 72 and the auxiliary electrode 150 is configured to be protected from the outside air, the sealing film 80 may be omitted.
FIG. 5 shows a simplified cross-sectional view of a lighting device 1C according to this modification. As shown in FIG. 5, in the lighting device 1 </ b> C, the sealing film 80 is not provided, and the layer structure formed on the substrate 10 is protected by the seal 90 and the counter substrate 110. Note that a configuration may be employed in which a desiccant (not shown) for adsorbing moisture is disposed inside the counter substrate 110, or a desiccant embedded in the counter substrate 110 itself is used. Further, a sealing can may be used instead of the counter substrate 110 and the seal 90.
FIG. 6 shows a simplified cross-sectional view of another illumination device 1D according to this modification. As shown in FIG. 6, in the lighting device 1 </ b> D, the layer structure is removed from the outside air by filling a moisture-proof filler 65 between the counter substrate 110 and the layer structure formed on the substrate 10. Protect. The moisture-proof filler 65 is preferably light transmissive and low moisture-absorbing, and an epoxy or urethane adhesive can be used.

  FIG. 7 shows another layout example of the lighting device. As shown in FIG. 7, in the lighting device 3 </ b> A, the second electrode power line 140 is arranged in a U-shape. Further, the first electrode power line 130 is disposed in a U shape inside the second electrode power line 140.

  As illustrated, the insulating layer 35 is formed so as to cover the entire effective region A and a part of the first electrode power line 130. The common electrode 72 is formed so as to cover substantially the same part as the insulating layer 35 and to be inside the corresponding end of the insulating layer 35 at each end of the four sides of the common electrode 72. Therefore, in this modification, on all sides of the substrate 10, the second region where the insulating layer 35 is formed is the first region where the common electrode 72 is formed in the outer direction in the plane of the substrate 10. It's overhanging.

As shown in the figure, the auxiliary electrode is formed as a stripe-like individual electrode 150e extending from the connection terminal toward the planarly opposed sides. The end of the individual electrode 150e on one end side of the substrate 10 is formed so as to overlap and contact the second electrode power line 140.
In this example, the individual electrode 150e intersects the first electrode power line 130. However, since the insulating layer 35 is formed on the upper surface of the first electrode power line 130, the individual electrode 150e is the first electrode 150e. It can be formed so as to contact only the second electrode power line 140 without contacting the electrode power line 130. Similarly, the common electrode 72 and the first electrode power line 130 overlap, but since the insulating layer 35 is formed on the upper surface of the first electrode power line 130, the common electrode 72 and the first electrode power line 130 It can be set as the structure which does not contact 130 electrically. On the other hand, the end of the individual electrode 150e on the other end side of the substrate 10 is formed outside the end of the common electrode 72 and further outside the end of the insulating layer 35 (second region). The Therefore, the effect similar to each embodiment mentioned above is acquired also by 3 A of illuminating devices.

  DESCRIPTION OF SYMBOLS 1,1C, 1D, 2A, 3A ... Illuminating device, 10 ... Board | substrate, 70 ... Light emitting element, 35 ... Insulating layer, 65 ... Moisture-proof filler, 72 ... Common electrode (2nd electrode), 74 ... Light emission functional layer, 76: 1st electrode, 80 ... Sealing film, 90 ... Seal, 110 ... Counter substrate, 140 ... Power line for second electrode, 150 ... Auxiliary electrode, 150e ... Individual electrode, A ... Effective area, B ... Peripheral area, C ... Joint part, E1-E5 ... End, 300-301 ... Evaporation mask.

Claims (7)

A lighting device having an effective area in which a light emitting element is disposed and a peripheral area that is an area outside the effective area,
  A first electrode formed in the effective region and the peripheral region;
  A second electrode formed in the effective region and the peripheral region;
  A light emitting layer disposed in the effective region and sandwiched between the first electrode and the second electrode;
  An insulating layer formed in the peripheral region and insulating the first electrode and the second electrode in the peripheral region;
  An auxiliary electrode electrically connected to the second electrode;
  With
The insulating film has an inner end and an outer end, and the inner end serves as a boundary between the effective region and the peripheral region,
  In the peripheral region, the end portion of the second electrode is located inside the end portion of the auxiliary electrode and the outer end portion of the insulating layer. The lighting device according to claim 1, wherein the insulating film covers an upper surface of the first electrode and an end surface of the first electrode in the peripheral region. 3. The lighting device according to claim 1, wherein an outer end portion of the insulating layer is located between an end portion of the second electrode and an end portion of the auxiliary electrode. The auxiliary electrode is a plurality of stripe-like individual electrodes along a first direction in plan view, and is formed across the effective region and the peripheral region. The lighting device according to any one of the above.   The lighting device according to claim 4, wherein a second electrode power line for connecting the plurality of individual electrodes to each other is further formed in the peripheral region. The outer end portion of the insulating layer is formed inside the inner end portion of the second electrode power line, and the auxiliary electrode and the second electrode power line are located outside the outer end portion of the insulating layer. The lighting device according to claim 5, wherein the lighting device is connected in the region of   The lighting device according to claim 5, wherein the second electrode power supply line extends in a direction intersecting with the first direction.

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