JP2014038783A - Illumination device, electronic apparatus, imaging device, and inspection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illumination device with less illuminance unevenness, and an imaging device, an inspection device, and an electronic apparatus employing the illumination device.SOLUTION: An illumination device 10A extends in an X direction and comprises: a plurality of first wiring 11 arranged in parallel in a Y direction intersecting with the X direction; second wiring 12 which extends in the Y direction and to which one ends of the plurality of first wiring 11 are connected; third wiring 13 which extends in the Y direction, provided at an outer side than the second wiring 12, and one end of which is connected with the second wiring 12; a first terminal part 17 to which the other end of the third wiring 13 is connected; fourth wiring 26 formed at least across in a region E1; fifth wiring which extends in the Y direction; and sixth wiring which extends in the X direction, electrically connected to the fourth wiring 26, and connected with the fifth wiring. An anode 2 as a first electrode for each of a plurality of organic EL elements 1 is connected with one of the plurality of first wiring 11, and a part of the fourth wiring 26 functions as a cathode 8 as a second electrode.

Description

  The present invention relates to an illumination device and an electronic apparatus, an imaging device, and an inspection device that include the illumination device.

The lighting device includes a plurality of light emitting element portions arranged in a distributed manner, and a first wiring and a second wiring connected to the plurality of light emitting element portions, and the first wiring and the second wiring extend in parallel with each other. An illumination device having a pattern is known (Patent Document 1).
According to the illumination device of Patent Document 1, since the first wiring and the second wiring are made of a light-transmitting material, light extraction efficiency is improved without hindering light emission from the plurality of light-emitting element portions. You can do that.
Examples of the translucent material constituting the first wiring and the second wiring include ITO (Indium Tin Oxide) and IZO (Indium Zinc Oxide). Since these transparent conductive materials have a larger electric resistance than opaque conductive materials such as aluminum and copper, a voltage drop occurs as the distance from the power feeding portion increases in the first wiring and the second wiring, and the first wiring and the second wiring. There is a possibility that uneven luminance of light emission occurs in a plurality of light emitting element portions connected to the wiring.
Therefore, for example, in Patent Document 2, a transparent wiring layer that is formed over a light emitting region in which a plurality of light emitting elements are formed and a peripheral region thereof, and is electrically connected to the plurality of light emitting elements, and a peripheral region is formed. An illuminating device is disclosed that includes a low-resistance wiring layer that is in contact with the transparent wiring layer and has a lower (smaller) electrical resistance than the transparent wiring layer. According to Patent Document 2, a power supply to the transparent wiring layer through the low-resistance wiring layer reduces the voltage drop of the transparent wiring layer in the peripheral region and can emit light with uniform light intensity. Can provide.

JP 2008-77865 A JP 2010-238497 A

  Patent Document 2 gives an example in which an organic EL (electroluminescence) element is used as a light emitting element. The transparent wiring layer has an anode wiring functioning as an anode of the organic EL element and a cathode wiring electrically connected to the cathode of the organic EL element, and is in contact with the independently formed low-resistance wiring layer. The anode wiring and the cathode wiring are in parallel, and are in contact with the low resistance wiring layers provided on both ends of the parallel wiring. Accordingly, the electrical resistance of the anode wiring increases from one end in contact with the low resistance wiring layer to the other end. On the other hand, since the cathode wiring is in contact with the low resistance wiring layer provided on the other end side of the anode wiring, the electric resistance increases from the other end toward one end. In other words, since the electrical resistance distribution between the anode wiring and the cathode wiring in parallel is different, the potential between the anode and the cathode in the plurality of light emitting elements varies, and there is a possibility that light emission with uniform light intensity may not be obtained. There are challenges.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 An illumination apparatus according to this application example is an illumination apparatus having a region where a plurality of organic EL elements each having a light emitting layer are disposed between a first electrode and a second electrode on a substrate. A plurality of first wirings extending in a first direction and parallel to each other in a second direction intersecting the first direction; and one of the plurality of first wirings extending in the second direction A second wiring connected to the second wiring, a third wiring extending in the second direction and provided outside the second wiring, and having one end connected to the second wiring; A first terminal connected to the other end of the third wiring, a fourth wiring extending in the first direction and the second direction, and formed over at least the region; A fifth wiring extending in the second direction and provided outside the third wiring; and extending in the first direction and extending in the second direction. A sixth wiring electrically connected to one end of the fourth wiring and connected to one end of the fifth wiring on the opposite side of the first terminal portion, and the fourth wiring A second terminal portion connected to the other end portion in the second direction, and a third terminal portion connected to the other end portion of the fifth wiring, and the first electrode includes It is connected to any one of a plurality of first wirings, and a part of the fourth wiring functions as the second electrode.

According to this configuration, a plurality of potentials (hereinafter referred to as first potentials) applied to the first terminal portion for causing the plurality of organic EL elements to emit light are transmitted via the third wiring and the second wiring in this order. To the first electrode electrically connected to any one of the plurality of first wirings. Since the plurality of first wirings are arranged in parallel in the second direction, the first wiring closest to the first terminal portion among the plurality of first wirings is the first terminal on the electrical wiring path. It will be located at the farthest from the part. That is, the electrical resistance of the plurality of first wirings increases as the first wiring is closer to the first terminal portion. Therefore, the voltage drop of the first potential increases as the first wiring is closer to the first terminal portion.
In contrast, the potential applied to the second terminal portion and the third terminal portion in order to cause the plurality of organic EL elements to emit light (hereinafter referred to as the second potential) is a constant potential with respect to the first potential. (For example, GND potential) is given. Since a part of the fourth wiring formed over the region where the plurality of organic EL elements are arranged functions as the second electrode, the position of the second electrode in the fourth wiring becomes farther from the second terminal portion. Increases electrical resistance. That is, as the second electrode is closer to the second terminal portion, the voltage loss of the second potential is smaller, and the second potential increases as the distance from the second terminal portion is increased. However, according to this configuration, the second potential applied from the third terminal portion is transmitted to the fourth wiring via the fifth wiring and the sixth wiring, without receiving a voltage loss contributing to light emission. The voltage is applied to the fourth wiring from the side opposite to the second terminal portion. That is, by simultaneously applying the second potential from the second terminal portion and the third terminal portion, the influence of the voltage increase of the second potential applied to the fourth wiring is smaller as it is closer to the second and third terminal portions, The voltage increase increases as the distance from the second and third terminal portions increases.
Therefore, the tendency of the voltage drop of the first potential due to the difference in electrical distance between the first terminal portion and the plurality of first electrodes and the difference in electrical distance between the second terminal portion and the second electrode. The resulting increase in voltage of the second potential is similar in the second direction in which the plurality of first wirings are arranged. Further, the application of the second potential from the third terminal portion suppresses the voltage increase of the second potential applied to the second electrode, and the distribution of potential differences between the plurality of first electrodes and the second electrode. Can be brought close to or coincident with the difference between the first potential and the second potential, so that unevenness in luminance due to variations in drive voltage can be reduced in a plurality of organic EL elements. In other words, it is possible to provide an illumination device in which unevenness in luminance due to the arrangement of wirings for supplying power to a plurality of organic EL elements is reduced.

  Application Example 2 An illumination apparatus according to this application example is an illumination apparatus having a region where a plurality of organic EL elements each having a light emitting layer are disposed between a first electrode and a second electrode on a substrate. A plurality of first wirings extending in a first direction and parallel to each other in a second direction intersecting the first direction; and one of the plurality of first wirings extending in the second direction A second wiring connected to the second wiring, a third wiring extending in the second direction and provided outside the second wiring, and having one end connected to the second wiring; A first terminal connected to the other end of the third wiring, and at least a plurality of first terminals extending in the second direction and parallel to each other at an interval in the first direction; A fourth wiring having four wiring branches, and a fifth wiring extending in the second direction and provided outside the third wiring; Extending in the first direction, electrically connected to one end of the plurality of fourth wiring branches on the opposite side of the first terminal portion in the second direction, and the fifth A sixth wiring connected to one end of the wiring; a second terminal connected to the other end of the plurality of fourth wiring branches in the second direction; and the other of the fifth wiring A first terminal connected to one of the plurality of first wirings, and a part of the fourth wiring branch functioning as the second electrode. The organic EL element is provided corresponding to an intersection of the plurality of first wirings and the plurality of fourth wiring branch portions.

According to this configuration, a plurality of potentials (hereinafter referred to as first potentials) applied to the first terminal portion for causing the plurality of organic EL elements to emit light are transmitted via the third wiring and the second wiring in this order. And is applied to the plurality of first electrodes electrically connected in parallel to the plurality of first wirings. Since the plurality of first wirings are arranged in parallel in the second direction, the first wiring closest to the first terminal portion among the plurality of first wirings is the first terminal on the electrical wiring path. It will be located at the farthest from the part. That is, the electrical resistance of the plurality of first wirings increases as the first wiring is closer to the first terminal portion. Therefore, the voltage drop of the first potential increases as the first wiring is closer to the first terminal portion.
In contrast, the potential applied to the second terminal portion and the third terminal portion in order to cause the plurality of organic EL elements to emit light (hereinafter referred to as the second potential) is a constant potential with respect to the first potential. (For example, GND potential) is given. Part of the fourth wiring branch functions as a second electrode, and the electrical resistance of each of the fourth wiring branch increases as the distance from the second terminal portion increases. That is, as the second electrode is closer to the second terminal portion, the voltage loss of the second potential is smaller, and as the second electrode is further away from the second terminal portion, the second potential is increased. However, according to this configuration, the second potential applied from the third terminal portion is transmitted to the plurality of fourth wiring branch portions via the fifth wiring and the sixth wiring, and voltage loss contributing to light emission. Without being received, the voltage is applied to the plurality of fourth wiring branches from the side opposite to the second terminal portion, so that the voltage rises closer to the second terminal portion. That is, by applying the second potential simultaneously from the second terminal portion and the third terminal portion, the influence of the voltage increase of the second potential applied to the plurality of fourth wiring branch portions is applied to the second and third terminal portions. The closer the distance is, the smaller the distance from the second and third terminal portions.
Therefore, the tendency of the voltage drop of the first potential due to the difference in electrical distance between the first terminal portion and the plurality of first electrodes and the difference in electrical distance between the second terminal portion and the second electrode. The resulting increase in voltage of the second potential is similar in the second direction in which the plurality of first wirings are arranged. Further, the application of the second potential from the third terminal portion suppresses the voltage increase of the second potential applied to the second electrode, and the distribution of potential differences between the plurality of first electrodes and the second electrode. Can be brought close to or coincident with the difference between the first potential and the second potential, so that unevenness in luminance due to variations in drive voltage can be reduced in a plurality of organic EL elements. In other words, it is possible to provide an illumination device in which unevenness in luminance due to the arrangement of wirings for supplying power to a plurality of organic EL elements is reduced.

Application Example 3 In the lighting device according to the application example, a seventh wiring extending in the second direction and connected to the other end of the plurality of first wirings, and in the second direction An eighth wiring extending outside the seventh wiring and having one end connected to the seventh wiring; and a fourth terminal connected to the other end of the eighth wiring; A ninth wiring provided on the outside of the eighth wiring and having one end connected to the sixth wiring and a fifth terminal connected to the other end of the ninth wiring; In the second direction, it is preferable that the first terminal portion, the second terminal portion, the third terminal portion, the fourth terminal portion, and the fifth terminal portion are arranged on the same side.
According to this configuration, if a first potential for causing the organic EL element to emit light is applied to the first terminal portion and the fourth terminal portion, power is supplied from both ends of the plurality of first wirings. The degree of voltage drop of the first potential due to the difference in electrical distance between the first terminal portion and the fourth terminal portion and the plurality of first electrodes can be reduced. Further, if a second potential for causing the organic EL element to emit light is applied to the second terminal portion, the third terminal portion, and the fifth terminal portion, power is supplied from both sides in the second direction of the fourth wiring. Therefore, the degree of voltage increase of the second potential due to the difference in electrical distance between the second terminal portion, the third terminal portion, the fifth terminal portion, and the plurality of second electrodes can be reduced. In other words, it is possible to provide an illumination device that can suppress useless power consumption due to loss of drive voltage and can emit light with stable luminance.

Application Example 4 In the illumination device according to the application example described above, among the plurality of first wirings, at least one first wiring located on a central side of the region may have a width larger than other first wirings. preferable.
According to this, the electrical resistance of at least one 1st wiring located in the center side of the area | region where the some organic EL element is arrange | positioned can be made small compared with another 1st wiring. Therefore, the tendency of the voltage drop of the first potential due to the difference in electrical distance between the first terminal portion and the plurality of first electrodes can be moderated. In other words, it is possible to make the luminance unevenness caused by the variation in driving voltage applied between adjacent organic EL elements more inconspicuous.

Application Example 5 In the lighting device according to the application example, the plurality of first wirings, the second wiring, the third wiring, the fifth wiring, the sixth wiring, the seventh wiring, and the eighth wiring. The ninth wiring is preferably provided in the same layer on the substrate.
According to this, it becomes possible to form wirings other than the fourth wiring in the same wiring forming process, and it is possible to provide a lighting device having an excellent cost performance by simplifying the wiring forming process.

Application Example 6 In the illumination device according to the application example, the plurality of first wirings are provided over at least the region, and the second wiring, the third wiring, the fifth wiring, and the sixth wiring. The seventh wiring, the eighth wiring, and the ninth wiring are preferably provided outside the region.
According to this, light emission from the plurality of organic EL elements is not hindered by the second wiring, the third wiring, the fifth wiring, the sixth wiring, the seventh wiring, the eighth wiring, and the ninth wiring. It is injected.

Application Example 7 In the lighting device according to the application example, it is preferable that the width of the third wiring is larger than that of the second wiring, and the width of the eighth wiring is larger than that of the seventh wiring.
According to this, the voltage drop of the 1st potential in the 3rd wiring directly connected to the 1st terminal part and the 8th wiring connected directly to the 4th terminal part can be controlled. Therefore, it is possible to make the luminance unevenness caused by the variation in the driving voltage applied between the plurality of organic EL elements more inconspicuous.

Application Example 8 In the lighting device according to the application example, it is preferable that the width of the fifth wiring is equal to that of the third wiring, and the width of the ninth wiring is equal to that of the eighth wiring.
According to this, as compared with the case where the width of the fifth wiring with respect to the third wiring and the width of the ninth wiring with respect to the eighth wiring are unequal, the fifth wiring directly connected to the third terminal portion, and It is possible to suppress variations in the voltage increase of the second potential in the ninth wiring directly connected to the five terminal portions. Therefore, it is possible to make the luminance unevenness caused by the variation in the driving voltage applied between the plurality of organic EL elements more inconspicuous.

Application Example 9 In the illumination device according to the application example described above, an insulating layer that covers the plurality of first wirings on the substrate, and a plurality of contacts provided in the insulating layer that overlaps the plurality of first wirings. And the first electrode is provided to overlap with one first wiring of the plurality of first wirings, and is formed in at least one contact hole of the plurality of contact holes. The film is electrically connected to the one first wiring by a film.
According to this configuration, the organic EL element is disposed at a position overlapping the first wiring. Compared to the case where the organic EL elements are arranged between the first wirings arranged in parallel in the second direction, the organic EL elements can be arranged with high density. Further, in the case where the illumination device and a plurality of light receiving elements are combined to form an imaging device, the organic EL element does not get in the way when the light receiving elements are arranged between the first wires. In other words, since the degree of freedom in the arrangement of the light receiving elements is increased, a clearer subject image can be obtained.

Application Example 10 In the illumination device according to the application example described above, the plurality of first wirings are made of a light-reflective conductive material, and the first electrode and the fourth wiring are conductive light-transmitting materials. It is composed of a material.
According to this configuration, light emitted from the plurality of organic EL elements can be extracted from the second electrode side, and the first wiring has light reflectivity, so that the efficiency of extracting light can be increased. That is, it is possible to provide an illumination device that can obtain bright surface light emission.

Application Example 11 In the illumination device according to the application example, the conductive film formed in the at least one contact hole is formed of a conductive material having the same light transmittance as that of the first electrode. And
According to this configuration, the first electrode electrically connected to the first wiring through the contact hole is formed by forming a light-transmitting conductive material such as ITO or IZO and patterning the insulating layer. Can be formed. The first wiring formed of a conductive material having light reflectivity can be in a lower resistance state than the first electrode. On the other hand, since a part of the first electrode formed in the contact hole has a high resistance, the contact hole itself can have a fuse function. That is, when some of the organic EL elements are short-circuited, an overcurrent larger than a predetermined value flows through the organic EL element. If the conductive film in the contact hole is melted and disconnected due to the overcurrent, the current flow in the other organic EL element, that is, the light emission of the other organic EL element is not affected.

Application Example 12 In the lighting device according to the application example described above, the illumination device according to the application example includes a tenth wiring extending in the first direction and electrically connecting the fourth wiring and the second terminal. The wiring is preferably made of a conductive material having a lower resistance than the fourth wiring.
According to this configuration, the change in electrical resistance due to the distance from the second terminal portion in the second electrode can be reduced.

Application Example 13 In the lighting device according to the application example, the tenth wiring is provided outside the region, and the first wiring, the second wiring, the third wiring, The fifth wiring, the sixth wiring, the seventh wiring, the eighth wiring, and the ninth wiring are preferably formed in the same layer.
According to this, since a wiring formation process can be simplified, the illuminating device which has the outstanding cost performance can be provided.

Application Example 14 An electronic apparatus according to the present invention is characterized by including the illumination device according to the application example.
According to this configuration, since the illumination device with reduced luminance unevenness is provided, an electronic device having a good appearance can be provided.

Application Example 15 An imaging apparatus according to the present invention includes the illumination apparatus according to the application example described above, and a light receiving element that captures an image of a subject illuminated by the illumination apparatus.
According to this configuration, since the illumination device with reduced luminance unevenness is provided, it is possible to provide an imaging device capable of capturing an image of a subject with little contrast unevenness.

Application Example 16 An inspection apparatus according to the present invention includes an illumination apparatus according to the application example, a light receiving element that captures an image of a subject illuminated by the illumination apparatus, and a control unit that performs inspection based on a detection result of the light receiving element. And.
According to this configuration, since the illumination device with reduced luminance unevenness is provided, it is possible to provide an inspection device capable of performing a more accurate inspection based on an image of a subject with less contrast unevenness.

The circuit diagram which shows the electrical constitution of the illuminating device of 1st Embodiment. The schematic plan view which shows the structure of the illuminating device of 1st Embodiment. The schematic plan view which shows the structure of the principal part of the illuminating device of 1st Embodiment. FIG. 4 is a schematic sectional view taken along line A-A ′ of FIG. 3. The schematic cross section which shows the structure of an organic EL element. The schematic plan view which shows the structure of the illuminating device of a comparative example. (A) is a figure which shows the magnitude relationship of the electric potential of the anode in the illuminating device of a comparative example, (b) is a figure which shows the magnitude relationship of the electric potential of the anode in the illuminating device of this embodiment. (A) is a graph showing the relationship between the potential of the anode (VEL) and the potential of the cathode (VCT) and the position of the organic EL element in the lighting device of the comparative example, and (b) is the potential of the anode in the lighting device of this embodiment. The graph which shows the relationship between (VEL) and the electric potential (VCT) of a cathode, and the position of an organic EL element. The circuit diagram which shows the electric constitution of the illuminating device of 2nd Embodiment. (A) is a schematic plan view which shows the structure of the illuminating device of 2nd Embodiment, (b) is a schematic plan view which shows arrangement | positioning of the anode and cathode in the organic EL element of the illuminating device of 2nd Embodiment. The block diagram which shows the structure of the biometrics apparatus as a test | inspection apparatus. The schematic plan view which shows arrangement | positioning of an organic EL element and a light receiving element. FIG. 2 is a schematic cross-sectional view illustrating a structure of an imaging device. The schematic plan view which shows arrangement | positioning of the organic EL element of a modification.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the drawings. Note that the drawings to be used are appropriately enlarged or reduced so that the part to be described can be recognized.

(First embodiment)
<Lighting device>
First, the illuminating device of this embodiment is demonstrated with reference to FIGS. FIG. 1 is a circuit diagram showing the electrical configuration of the illumination device of the first embodiment, FIG. 2 is a schematic plan view showing the configuration of the illumination device of the first embodiment, and FIG. 3 is a schematic diagram of the illumination device of the first embodiment. FIG. 4 is a schematic cross-sectional view taken along line AA ′ of FIG. 3, and FIG. 5 is a schematic cross-sectional view showing the configuration of the organic EL element.

  As shown in FIG. 1, the illuminating device 10A of this embodiment has the area | region E1 in which the multiple organic EL (Electro Luminescence) element 1 as a light emitting element is arrange | positioned. In the present embodiment, a total of 35 organic EL elements 1 in the region E1, 7 in the X direction as the first direction and 5 in the Y direction as the second direction intersecting (orthogonal) with the first direction. Are arranged in a matrix. The illumination light is emitted from the region E1, that is, the region E1 is a substantial light emitting region. The number of organic EL elements 1 arranged in the region E1 is not limited to this.

  Although the detailed configuration of the organic EL element 1 will be described later, the organic EL element 1 has a light emitting layer made of an organic film between the anode 2 as the first electrode and the cathode 8 as the second electrode. Each anode 2 of the plurality of organic EL elements 1 is connected to one of a plurality (five) of first wirings 11. The anodes 2 of the seven organic EL elements 1 are electrically connected in parallel to the first wiring 11 per one.

  One end of the plurality of first wirings 11 extending in the X direction is connected to the second wiring 12 extending in the Y direction. The second wiring 12 is connected to a third wiring 13 that also extends in the Y direction. One end of the third wiring 13 is connected to the second wiring 12, and a first terminal portion 17 is provided at the other end of the third wiring 13.

  The other end of the plurality of first wirings 11 extending in the X direction is connected to a seventh wiring 14 extending in the Y direction. The seventh wiring 14 is connected to an eighth wiring 15 that also extends in the Y direction. One end of the eighth wiring 15 is connected to the seventh wiring 14, and a fourth terminal portion 19 is provided at the other end of the eighth wiring 15. That is, the plurality of first wirings 11 are connected to power supply wirings at both ends in the X direction.

  The 4th wiring 26 is formed over the area | region E1 in which the some organic EL element 1 is arrange | positioned. One end of the fourth wiring 26 in the Y direction is connected to a sixth wiring 28 extending in the X direction. One end of the sixth wiring 28 extending in the X direction is connected to one end of the fifth wiring 30 extending in the Y direction, and the third terminal is connected to the other end of the fifth wiring 30. A portion 27 is provided. The other end of the sixth wiring 28 extending in the X direction is connected to one end of the ninth wiring 31 extending in the Y direction, and the fifth terminal portion is connected to the other end of the ninth wiring 31. 29 is provided. That is, the fourth wiring 26 is connected to the power supply wiring on both sides in the X direction via the sixth wiring 28.

  A part of the fourth wiring 26 functions as the cathode 8 of the organic EL element 1, and the plurality of organic EL elements 1 are electrically connected to the sixth wiring 28 via the fourth wiring 26. A second terminal portion 18 is provided via the tenth wiring 16 at the other end in the Y direction of the fourth wiring 26.

In the plurality of organic EL elements 1, a driving voltage is applied between the first terminal portion 17 and the fourth terminal portion 19, the second terminal portion 18 and the third terminal portion 27, and the fifth terminal portion 29. When a current flows between the cathode 8 and the light emitting layer, the light emitting layer emits light. For example, the GND potential (0V) is applied to the second terminal portion 18 and the third terminal portion 27 and the fifth terminal portion 29, and the first terminal portion 17 and the fourth terminal portion 19 are supplied with the GND potential (0V). Is also given a large potential (+ potential). As a result, a current flows from the anode 2 toward the cathode 8. That is, holes are injected from the anode 2 and electrons are injected from the cathode 8. In the light-emitting layer, excitons (excitons) are generated by the injected holes and electrons, and part of the energy is fluorescent when the excitons (excitons) disappear (when the holes and electrons recombine). And emitted as phosphorescence.
The light emission luminance of one organic EL element 1 is determined by the amount of current flowing between the anode 2 and the cathode 8. If the amount of current is smaller than a value at which a predetermined luminance is obtained, the luminance is smaller than the predetermined luminance. The amount of current depends on the potential difference between the anode 2 and the cathode 8. In other words, if the driving voltage applied between the anode 2 and the cathode 8 varies in each of the plurality of organic EL elements 1, the luminance varies.

  In the present embodiment, the configuration of each wiring connected to the plurality of organic EL elements 1 is devised so that the luminance unevenness of light emission is not noticeable in the plurality of organic EL elements 1 of the lighting device 10A. FIG. 2 shows a specific configuration of each wiring in the lighting apparatus 10A.

  As shown in FIG. 2, the plurality of first wirings 11 extend in the X direction and are arranged in parallel in the Y direction at a predetermined interval. As described above, one end (the left end in the drawing) of the plurality of first wirings 11 is connected to the second wiring 12 extending in the Y direction. A third wiring 13 is also provided outside the second wiring 12 and extends in the Y direction. One end of the third wiring 13 (the upper end in the Y direction in the drawing) is the second wiring. 12 is connected. A first terminal portion 17 is provided at the other end portion of the third wiring 13 (the lower end portion in the Y direction in the drawing).

  The other end (the right end in the drawing) of the plurality of first wirings 11 is connected to a seventh wiring 14 extending in the Y direction. Similarly, an eighth wiring 15 extending in the Y direction is provided outside the seventh wiring 14, and one end of the eighth wiring 15 (the upper end in the Y direction in the drawing) is the seventh wiring. 14. A fourth terminal portion 19 is provided at the other end portion (the lower end portion in the Y direction in the drawing) of the eighth wiring 15.

As described above, the fourth wiring 26 is formed over at least the region E <b> 1 including the plurality of organic EL elements 1, and a part of the fourth wiring 26 functions as the cathode 8. The fourth wiring 26 is quadrangular in plan view, and the tenth wiring 16 is provided in contact with the lower side in the Y direction. The second terminal portion 18 is provided along the tenth wiring 16 extending in the X direction. The fourth wiring 26 is electrically connected to the fifth wiring 30 and the ninth wiring 31 through a sixth wiring 28 extending in the X direction. The third terminal portion 27 is provided on the fifth wiring 30, and the fifth terminal portion 29 is provided on the ninth wiring 31.
That is, the first terminal portion 17, the second terminal portion 18, the third terminal portion 27, the fourth terminal portion 19, and the fifth terminal portion 29 are provided on the lower side in the Y direction in the drawing. The second terminal unit 18 is disposed between the first terminal unit 17 and the fourth terminal unit 19, the third terminal unit 27 is installed outside the first terminal unit 17, and the second terminal unit 17 is installed outside the fourth terminal unit 19. Five terminal portions 29 are provided.

  Of the second wiring 12, the third wiring 13, the seventh wiring 14, and the eighth wiring 15 connected to the plurality of first wirings 11, the second wiring 12 and the seventh wiring 14 are formed with the same width (thickness). Has been. The third wiring 13 and the eighth wiring 15 are formed with the same width (thickness). The width (thickness) of the third wiring 13 is larger than that of the second wiring 12. Similarly, the width (thickness) of the eighth wiring 15 is larger than that of the seventh wiring 14. As a result, the potential applied to the first terminal portion 17 and the fourth terminal portion 19 is suppressed from decreasing due to the electrical resistance of the third wiring 13 and the eighth wiring 15.

  The fifth wiring 30 and the ninth wiring 31 connected to the sixth wiring 28 are formed with the same width (thickness) as the third wiring 13 and the eighth wiring 15 inside. As a result, the potential applied to the third terminal portion 27 and the fifth terminal portion 29 is prevented from increasing due to the electrical resistance of the fifth wiring 30 and the ninth wiring 31.

  The plurality of first wirings 11, second wirings 12, third wirings 13, fifth wirings 30, sixth wirings 28, seventh wirings 14, eighth wirings 15, ninth wirings 31, and tenth wirings 16 are respectively substrates. Formed on top. Moreover, it is preferable to form in the same wiring layer (same layer) on a board | substrate. Furthermore, it is preferable to use the same conductive material. As a conductive material constituting these wirings, a metal or an alloy having a smaller electric resistance than each of the conductive materials constituting the anode 2 and the cathode 8 of the organic EL element 1 is desirable. For example, Al (aluminum) or Cu (copper) ) And the like.

  The first terminal portion 17, the second terminal portion 18, the third terminal portion 27, the fourth terminal portion 19, and the fifth terminal portion 29 are formed in contact with the corresponding wiring or as part of the corresponding wiring, respectively. Yes. In order to further reduce the electrical resistance of the first terminal portion 17, the second terminal portion 18, the third terminal portion 27, the fourth terminal portion 19, and the fifth terminal portion 29, it is formed of a material having a lower electrical resistance than the corresponding wiring. Or formed as part of the wirings facing each other and plated with Ni (nickel) or Au (gold).

  The plurality of first wires 11 are referred to as a first wire 11a, a first wire 11b, a first wire 11c, a first wire 11d, and a first wire 11e in the order of arrangement from the first terminal portion 17 side in the Y direction. To do.

Next, the configuration and structure of the organic EL element 1 will be described with reference to FIGS.
As shown in FIG. 3, the anode 2 of the organic EL element 1 is formed so as to overlap the first wiring 11 in plan view. The anode 2 and the first wiring 11 are electrically connected via a conductive film in a contact hole 9 a provided at a position overlapping the anode 2. The shape of the anode 2 in this embodiment is a rectangle, and the anode 2 is arranged so that the longitudinal direction thereof matches the extending direction (X direction) of the first wiring 11. The width in the short direction of the anode 2 may be the same as the width of the first wiring 11, may be slightly smaller, or may be slightly larger. Since the cathode 8 is formed as a common electrode, a region where light emission can be obtained in one organic EL element 1 is substantially determined by the size of the anode 2.

  As shown in FIG. 4, the first wiring 11 is formed on the substrate P1. As the substrate P1 of the present embodiment, a translucent substrate such as glass or plastic can be used. In the present embodiment, the first wiring 11 is formed using, for example, Al (aluminum) having light reflectivity. An insulating layer 9 is formed so as to cover the first wiring 11. The insulating layer 9 can be made of a light-transmitting inorganic material such as silicon oxide or an organic material such as acrylic resin. In the insulating layer 9, a plurality of contact holes 9 a are formed at positions overlapping the first wiring 11. The anode 2 is formed using a transparent conductive film such as ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide) which is light transmissive (light transmissive). Specifically, an ITO film is formed by vacuum deposition or sputtering so as to cover the surface of the insulating layer 9 in which the contact hole 9a is formed. Subsequently, the ITO film is patterned by photolithography so that the contact hole 9a is included in a plan view, thereby forming the independent anodes 2 respectively. The anode 2 is electrically connected to the first wiring 11 through the ITO film in the contact hole 9a. That is, the plurality of anodes 2 arranged on the first wiring 11 are electrically connected in parallel to the first wiring 11 through the contact hole 9a. The first wiring 11 is formed using a conductive material having an electric resistance smaller than that of a transparent conductive film such as an ITO film constituting the anode 2. In contrast, the conductive film in the contact hole 9a that electrically connects the first wiring 11 and the anode 2, that is, the ITO film, is difficult to uniformly cover the stepped portion in the contact hole 9a of the insulating layer 9. Therefore, the electrical resistance tends to increase compared to other parts. Therefore, when the conductive film in the contact hole 9a functions as a resistance R interposed between the first wiring 11 and the anode 2, when one organic EL element 1 is short-circuited and an overcurrent exceeding a specified value flows, the resistance R melts (burns out), and the first wiring 11 and the anode 2 are electrically disconnected. That is, the resistor R functions as a fuse. In other words, even if an abnormality (short circuit) occurs in one organic EL element 1 and an overcurrent flows, the current stops flowing only in the organic EL element 1 and the other organic EL elements 1 operate normally. It is possible to ensure stable luminance.

  A light emitting functional layer LE is formed over at least the region E1 (see FIG. 2) so as to cover these anodes 2. Similarly, the fourth wiring 26 is formed over at least the region E1 so as to cover the light emitting functional layer LE. The fourth wiring 26 of the present embodiment is formed by controlling the film thickness so as to have translucency by an alloy of Mg (magnesium) and Ag (silver), for example. A portion of the fourth wiring 26 facing the anode 2 across the light emitting functional layer LE functions as the cathode 8. Therefore, a part of the light emitted from the light emitting functional layer LE is not only transmitted through the cathode 8 as it is, but also transmitted through the anode 2 and the insulating layer 9 and reflected by the first wiring 11, and again the insulating layer. 9 and the anode 2 are emitted from the cathode 8 side. That is, the light emission from the light emitting functional layer LE can be efficiently extracted from the cathode 8 side.

  The structure in the organic EL element 1 is not limited to this, for example, you may comprise an optical resonant structure between the 1st wiring 11 and the cathode 8 which have light reflectivity. Specifically, the fourth wiring 26 is formed using, for example, an alloy of Mg and Ag, and the film thickness is controlled so that the fourth wiring 26 has both translucency and light reflectivity. The insulating layer 9, the anode 2, and the light emitting functional layer LE are formed by controlling the film thickness so that the optical distance between the first wiring 11 and the cathode 8 is, for example, an integral multiple of 1/2 of the resonance wavelength λ. As a result, it is possible to extract light having high luminance at the resonance wavelength λ. The optical distance between the first wiring 11 and the cathode 8 is indicated by the sum of products of refractive indexes and film thicknesses of a plurality of functional layers arranged between them.

Next, a specific configuration example of the organic EL element 1 will be described with reference to FIG.
As shown in FIG. 5, the organic EL element 1 includes a hole injection layer 3, a hole transport layer 4, a light emitting layer 5, an electron transport layer 6, an electron injection layer 7, and a cathode, which are sequentially stacked on the anode 2. 8 has.

(anode)
The anode 2 is an electrode for injecting holes into the hole transport layer 4 via a hole injection layer 3 described later. As a constituent material of the anode 2, it is preferable to use a material having a large work function and excellent conductivity. For example, ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), In ₂ O ₃ , SnO ₂ , Sb-containing SnO ₂ , oxides such as Al-containing ZnO, Au, Pt, Ag, Cu or alloys containing these These can be used, and one or more of these can be used in combination.
In particular, the anode 2 is preferably made of ITO. ITO is a material having translucency, a large work function, and excellent conductivity. Thereby, holes can be efficiently injected from the anode 2 to the hole injection layer 3.
The film thickness of the anode 2 is not particularly limited, but is preferably about 10 nm to 200 nm, and more preferably about 50 nm to 150 nm.

(Hole injection layer)
The hole injection layer 3 has a function of improving the hole injection efficiency from the anode 2 (that is, has a hole injection property).
By providing the hole injection layer 3 between the anode 2 and the hole transport layer 4 described later, the hole injection property from the anode 2 is improved, and as a result, the luminous efficiency of the organic EL element 1 can be increased. it can.
The hole injecting material contained in the hole injecting layer 3 is not particularly limited. For example, copper phthalocyanine or 4,4 ′, 4 ″ -tris (N, N-phenyl-3-methylphenylamino) Examples include triphenylamine (m-MTDATA), N, N′-bis- (4-diphenylamino-phenyl) -N, N′-diphenyl-biphenyl-4-4′-diamine, and the like.
Among these, as the hole injecting material contained in the hole injecting layer 3, it is preferable to use an amine-based material from the viewpoint of excellent hole injecting property and hole transporting property, and a diaminobenzene derivative, a benzidine derivative (benzidine) It is more preferable to use a triamine-based compound or a tetraamine-based compound having both a “diaminobenzene” unit and a “benzidine” unit in the molecule.
The thickness of the hole injection layer 3 is not particularly limited, but is preferably about 5 nm to 90 nm, and more preferably about 10 nm to 70 nm.
The hole injection layer 3 may be omitted depending on the constituent materials of the anode 2 and the hole transport layer 4.

(Hole transport layer)
The hole transport layer 4 has a function of transporting holes injected from the anode 2 through the hole injection layer 3 to the light emitting layer 5 (that is, has a hole transport property).
As the hole transporting material contained in the hole transporting layer 4, various p-type polymer materials and various p-type low molecular materials can be used alone or in combination. For example, N, N′-di- (1-naphthyl) -N, N′-diphenyl-1,1′-diphenyl-4,4′-diamine (NPD), N, N′-diphenyl-N, N′-bis (3-methylphenyl)- Examples thereof include tetraarylbenzidine derivatives such as 1,1′-diphenyl-4,4′-diamine (TPD), tetraaryldiaminofluorene compounds or derivatives thereof (amine compounds), and one or two of them A combination of the above can be used.
Among them, the hole transporting material contained in the hole transporting layer 4 is preferably an amine material from the viewpoint of excellent hole injection property and hole transporting property, and a benzidine derivative (a material having a benzidine skeleton). Is more preferable.
The thickness of the hole transport layer 4 is not particularly limited, but is preferably about 5 nm to 90 nm, and more preferably about 10 nm to 70 nm.

(Light emitting layer)
The light emitting layer 5 emits light when energized between the anode 2 and the cathode 8. The light emitting material contained in the light emitting layer 5 is selected depending on what wavelength light is extracted. In the present embodiment, a luminescent material capable of obtaining a peak luminance wavelength in the near infrared region is used in consideration of being used in a biometric authentication device as an inspection device described later. Note that the near infrared region refers to a wavelength region of 700 nm to 1500 nm. The light emitting layer 5 may contain materials other than the light emitting material. For example, a light-emitting material may be used as a guest material and a host material for the guest material may be included. This host material has a function of generating excitons by injected holes and electrons, and excitating the luminescent material by transferring the energy of the exciton to the luminescent material (Felster transfer or Dexter transfer). . Therefore, the luminous efficiency of the organic EL element 1 can be increased.
The thickness of the light emitting layer 5 is not particularly limited, but is preferably about 1 nm to 60 nm, and more preferably about 3 nm to 50 nm.

(Electron transport layer)
The electron transport layer 6 has a function of transporting electrons injected from the cathode 8 through the electron injection layer 7 to the light emitting layer 5.
Examples of the constituent material (electron transporting material) of the electron transport layer 6 include phenanthroline derivatives such as 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), and tris (8-quinolinolato) aluminum. Quinoline derivatives such as organometallic complexes having 8-quinolinol or a derivative thereof such as (Alq3) as a ligand, azaindolizine derivatives, oxadiazole derivatives, perylene derivatives, pyridine derivatives, pyrimidine derivatives, quinoxaline derivatives, diphenylquinone derivatives , Nitro-substituted fluorene derivatives and the like, and one or more of them can be used in combination.
In addition, when the electron transport layer 6 is used in combination of two or more of the electron transport materials as described above, the electron transport layer 6 may be composed of a mixed material obtained by mixing two or more electron transport materials, or different. You may be comprised by laminating | stacking the some layer comprised with the electron transport material.
Although the film thickness of such an electron carrying layer 6 is not specifically limited, It is preferable that it is about 1 nm-200 nm, and it is more preferable that it is about 10 nm-100 nm.

(Electron injection layer)
The electron injection layer 7 has a function of improving the electron injection efficiency from the cathode 8.
Examples of the constituent material (electron injecting material) of the electron injection layer 7 include various inorganic insulating materials and various inorganic semiconductor materials.
Examples of such inorganic insulating materials include alkali metal chalcogenides (oxides, sulfides, selenides, tellurides), alkaline earth metal chalcogenides, alkali metal halides, and alkaline earth metal halides. Of these, one or two or more of these can be used in combination. By configuring the electron injection layer 7 using these as main materials, the electron injection property can be further improved. In particular, alkali metal compounds (alkali metal chalcogenides, alkali metal halides, etc.) have a very small work function, and the organic EL element 1 can obtain high luminance by forming the electron injection layer 7 using the work function. It becomes.
Examples of the alkali metal chalcogenide include Li ₂ O, LiO, Na ₂ S, Na ₂ Se, and NaO.
Examples of the alkaline earth metal chalcogenide include CaO, BaO, SrO, BeO, BaS, MgO, and CaSe.
Examples of the alkali metal halide include CsF, LiF, NaF, KF, LiCl, KCl, and NaCl.
Examples of the alkaline earth metal halide include CaF ₂ , BaF ₂ , SrF ₂ , MgF ₂ , and BeF ₂ .
Moreover, as an inorganic semiconductor material, for example, an oxide containing at least one element of Li, Na, Ba, Ca, Sr, Yb, Al, Ga, In, Cd, Mg, Si, Ta, Sb, and Zn , Nitrides, oxynitrides, and the like, and one or more of these can be used in combination.
The thickness of the electron injection layer 7 is not particularly limited, but is preferably about 0.1 nm to 1000 nm, more preferably about 0.2 nm to 100 nm, and about 0.2 nm to 50 nm. Is more preferable.
The electron injection layer 7 may be omitted depending on the constituent materials and thicknesses of the cathode 8 and the electron transport layer 6.

(cathode)
The cathode 8 is an electrode for injecting electrons into the electron transport layer 6 through the electron injection layer 7. As a constituent material of the cathode 8, it is preferable to use a material having a small work function.
As a constituent material of the cathode 8 (fourth wiring 26), for example, Li, Mg, Ca, Sr, La, Ce, Er, Eu, Sc, Y, Yb, Ag, Cu, Al, Cs, Rb or these are used. The alloy etc. which are included are mentioned, The 1 type (s) or 2 or more types of these can be combined (for example, as a laminated body of multiple layers, a mixed layer of multiple types, etc.).
In particular, when an alloy is used as a constituent material of the cathode 8 (fourth wiring 26), an alloy containing a stable metal element such as Ag, Al, or Cu, specifically, an alloy such as MgAg, AlLi, or CuLi is used. It is preferable to use it. By using such an alloy as a constituent material of the cathode 8 (fourth wiring 26), the electron injection efficiency and stability of the cathode 8 can be improved.

  The organic EL element 1 of the present embodiment is a top emission type and takes out light from the cathode 8 side. Therefore, an alloy of Mg and Ag is used as a material constituting the cathode 8, and the film thickness is set to about 1 nm to 50 nm. . When the organic EL element 1 is a bottom emission type, a material having light reflectivity may be used for the cathode 8 and the first wiring 11 may be made of a light transmissive material.

In the present embodiment, the anode 2, the hole injection layer 3, the hole transport layer 4, the light emitting layer 5, the electron transport layer 6, the electron injection layer 7, and the cathode 8 are each formed by using a vacuum evaporation method. In addition, the formation method of each layer is not limited to using vapor phase processes, such as a vacuum evaporation method and a sputtering method, You may use a liquid phase process.
Although the configuration of the organic EL element 1 has been described above, the configuration of the light emitting functional layer LE including the hole injection layer 3, the hole transport layer 4, the light emitting layer 5, the electron transport layer 6, and the electron injection layer 7 is limited to this. Not. For example, it may be configured to include an intermediate layer that controls the movement of holes and electrons as carriers.
Moreover, in order to ensure the light emission lifetime of the organic EL element 1, it is preferable to employ a structure in which the organic EL element 1 is sealed using a sealing film that prevents intrusion of oxygen, moisture, or the like.

  Next, in order to describe the improvement in luminance unevenness of the lighting device 10A according to the present embodiment, a lighting device of a comparative example will be described with reference to FIG. FIG. 6 is a schematic plan view showing a configuration of a lighting device of a comparative example. Note that, in the lighting device of the comparative example, the same reference numerals are given to the same components as those of the lighting device 10A of the present embodiment, and detailed description thereof is omitted.

As illustrated in FIG. 6, the lighting device 10 </ b> C of the comparative example is connected to any one of the plurality of (five) first wires 11 and the plurality of first wires 11 that extend in the X direction and are arranged in parallel in the Y direction. A plurality of organic EL elements 1 (seven in the X direction and five in the Y direction, a total of 35) are connected to the anode 2 (see FIG. 5). The plurality of organic EL elements 1 are provided on the first wiring 11.
One end (the left end in the drawing) of the plurality of first wirings 11 is connected to a third wiring 13 extending in the Y direction. A first terminal portion 17 is provided at an end portion (lower end portion in the drawing) of the third wiring 13.
The other end (the right end in the drawing) of the plurality of first wirings 11 is connected to an eighth wiring 15 extending in the Y direction. A fourth terminal portion 19 is provided at the end portion of the eighth wiring 15 (the lower end portion in the drawing).
The 4th wiring 26 is formed over the area | region E1 in which the some organic EL element 1 is arrange | positioned. One end portion (the upper end portion in the drawing) of the fourth wiring 26 is connected to a sixth wiring 28 extending in the X direction. The second terminal portion 18 is provided at the other end portion (lower end portion in the drawing) of the fourth wiring 26. One end (the left end in the drawing) of the sixth wiring 28 is connected to the fifth wiring 30 extending in the Y direction. A third terminal portion 27 is provided at the end of the fifth wiring 30 (the lower end in the drawing). The other end (the right end in the drawing) of the sixth wiring 28 is connected to a ninth wiring 31 extending in the Y direction. A fifth terminal portion 29 is provided at an end portion (the lower end portion in the drawing) of the ninth wiring 31.

  The tenth wiring 16 is provided in contact with the lower side portion of the fourth wiring 26 in the Y direction. A second terminal portion 18 is provided along the tenth wiring 16 extending in the X direction. That is, in the lighting device 10C of the comparative example, the second terminal portion 18 is disposed between the first terminal portion 17 and the fourth terminal portion 19 similarly to the lighting device 10A, and the second terminal portion 18 is disposed outside the first terminal portion 17. The third terminal portion 27 and the fifth terminal portion 29 are installed outside the fourth terminal portion 19.

  Next, regarding the potential (VEL) of the anodes 2 of the plurality of organic EL elements 1 and the potential (VCT) of the cathode 8 that is the common electrode in the illumination device 10A of the present embodiment and the illumination device 10C of the comparative example, FIG. And with reference to FIG. FIG. 7A is a diagram showing the magnitude relationship of the potential of the anode in the illumination device of the comparative example, and FIG. 7B is a diagram showing the magnitude relationship of the potential of the anode in the illumination device of this embodiment. FIG. 8A is a graph showing the relationship between the potential of the anode (VEL) and the potential of the cathode (VCT) and the position of the organic EL element in the illumination device of the comparative example, and FIG. 8B is the illumination device of this embodiment. 5 is a graph showing the relationship between the potential (VEL) of the anode and the potential (VCT) of the cathode and the position of the organic EL element.

  As shown in FIG. 7A, in the lighting device 10 </ b> C of the comparative example, the potential applied to the first terminal portion 17 and the fourth terminal portion 19 is the first due to the electrical resistance of the third wiring 13 and the eighth wiring 15. The potential drops as the distance from the first terminal portion 17 and the fourth terminal portion 19 increases. In other words, the closer to the first terminal portion 17 and the fourth terminal portion 19, the higher the potential, and the further away from the first terminal portion 17 and the fourth terminal portion 19, the smaller the potential. On the other hand, the potential of the first wiring 11 decreases as the distance from the third wiring 13 and the eighth wiring 15 increases due to the electrical resistance of the first wiring 11. That is, the potential increases as it goes to both ends of the first wiring 11 and decreases as it goes to the center. Therefore, as indicated by an arrow arranged in an oblique direction in FIG. 7A, for example, an organic located at the right end (side closer to the eighth wiring 15) of the first wiring 11 a closest to the fourth terminal portion 19. The largest potential is applied to the anode 2 of the EL element 1. The smallest potential is applied to the anode 2 of the organic EL element 1 located at the center of the first wiring 11 e farthest from the fourth terminal portion 19. Although not shown in FIG. 7A, the same result is obtained even when the potential applied to the anode 2 of each organic EL element 1 is considered with the first terminal portion 17 as a reference.

On the other hand, as shown in FIG. 7B, in the lighting device 10 </ b> A of the present embodiment, both end portions of the plurality of first wirings 11 are connected to the second wiring 12 and the seventh wiring 14. . The second wiring 12 is connected to the third wiring 13 at a position farthest from the first terminal portion 17. Similarly, the seventh wiring 14 is connected to the eighth wiring 15 at the position farthest from the fourth terminal portion 19.
That is, the second wiring 12 and the seventh wiring 14 extend in the Y direction as they are and are not connected to the first terminal portion 17 and the fourth terminal portion 19, and the first terminal portion 17 and the fourth terminal portion 19 are provided. It is folded back on the opposite side to the third wiring 13 and the eighth wiring 15.
Therefore, the potential in the seventh wiring 14 is the smallest on the side close to the fourth terminal portion 19 and the largest on the side far from the fourth terminal portion 19. On the other hand, the tendency of the potential in the first wiring 11 is the same as that in the comparative example. Therefore, as shown by an arrow arranged in an oblique direction in FIG. 7B, for example, the anode 2 of the organic EL element 1 positioned at the center of the first wiring 11a closest to the fourth terminal portion 19 is the most. A small potential is applied. The highest potential is applied to the anode 2 of the organic EL element 1 located at the right end of the first wiring 11e farthest from the fourth terminal portion 19 (side closer to the seventh wiring 14). Although not shown in FIG. 7B, the same result is obtained even when the potential applied to the anode 2 of each organic EL element 1 is considered with the first terminal portion 17 as a reference.

  As shown in FIGS. 2 and 6, the fourth wiring 26 in the lighting device 10 </ b> A of the present embodiment and the lighting device 10 </ b> C of the comparative example is formed as a common wiring extending over the plurality of organic EL elements 1, and a part of them is formed. It functions as the cathode 8. Accordingly, the voltage loss of the potential applied to the cathode 8 increases as the distance from the second terminal portion 18 increases due to the electrical resistance of the fourth wiring 26. On the other hand, one end of the fourth wiring 26 is connected to the sixth wiring 28, and the sixth wiring 28 is connected to the fifth wiring 30 and the ninth wiring 31. Since the same potential as that applied to the second terminal portion 18 is applied to the third terminal portion 27 of the fifth wiring 30 and the fifth terminal portion 29 of the ninth wiring 31, they are separated from the sixth wiring 28. As the electric resistance of the fourth wiring 26 increases, the voltage loss increases. That is, since the same potential is applied to the fourth wiring 26 from above and below, the potentials applied to the cathode 8 on the side near the second terminal portion 18 and the side near the sixth wiring 28 are substantially equal, and the closer to the center the closer to the center. The voltage rise is large. Note that the voltage rise in the center is the sixth in addition to the second terminal portion 18 as compared with the case where the voltage is applied from any one of the second terminal portion 18, the third terminal portion 27, and the fifth terminal portion 29. By applying a potential from the wiring 28 side, the potential can be kept low. As described above, for example, the GND potential (0 V) is applied, so that the potential of the fourth wiring 26 increases from the GND potential (0 V) as it approaches the center, and approaches the GND potential (0 V) as it approaches the sixth wiring 28. become.

  Therefore, as shown in FIG. 8A, the potential difference (ΔV) between the actual potential (VEL) of the anode 2 and the potential (VCT) of the cathode 8 in the plurality of organic EL elements 1 of the illumination device 10C of the comparative example. ) In relation to the distance (L) from the first terminal portion 17 and the fourth terminal portion 19 to the anode 2 and the distance (L) from the second terminal portion 18 to the cathode 8, the larger the distance (L) is. The potential difference (ΔV) becomes small. That is, the drive voltage applied to the anode 2 and the cathode 8 for each of the plurality of organic EL elements 1 varies, and luminance unevenness occurs due to the position of the organic EL element 1 in the region E1. The portion indicated by the broken line of the potential (VCT) of the cathode 8 indicates the potential (VCT) when the potential is applied only to the second terminal portion 18.

  On the other hand, in the illuminating device 10A of the present embodiment, the potential (VCT) of the cathode 8 increases as the distance (L) from the second terminal portion 18 increases as in the comparative example, and the sixth wiring 28 It descends as it approaches. On the other hand, the potential (VEL) of the anode 2 tends to increase as the distance (L) from the first terminal portion 17 and the fourth terminal portion 19 increases. Therefore, the potential difference (ΔV) between the potential (VEL) of the anode 2 and the potential (VCT) of the cathode 8 is not easily changed depending on the distance (L). That is, variation in driving voltage applied to the anode 2 and the cathode 8 for each of the plurality of organic EL elements 1 is suppressed, and the luminance unevenness due to the position of the organic EL element 1 in the region E1 is improved as compared with the comparative example. . In other words, it is possible to provide the lighting device 10A with less luminance unevenness.

  In the illuminating device 10A, it is desirable that the width of the first wiring 11c located on the center side among the plurality of first wirings 11 arranged in the Y direction is larger than that of the other first wirings 11a, 11b, 11d, and 11e. As a result, the potential (VEL) of the anode 2 in FIG. 8B quickly increases as the distance (L) increases as shown by the broken line. ) And the potential difference (ΔV) of the potential (VCT) of the cathode 8 can be further reduced. That is, the luminance unevenness of the lighting device 10 </ b> A caused by the distance (L) of the organic EL element 1 from the first terminal portion 17 and the fourth terminal portion 19 can be further reduced.

In order to make it difficult to visually recognize the luminance unevenness of the illumination device 10A, the ratio between the in-plane minimum value (ΔV _min ) and maximum value (ΔV _max ) of the potential difference (ΔV) in the region E1 where light emission is obtained. The plurality of first wirings 11, second wirings 12, third wirings 13, fifth wirings 30, and sixth wirings 28 so that the ratio obtained by subtracting (ΔV _min / ΔV _max ) from “1” is 5% or less. The seventh wiring 14, the eighth wiring 15, the ninth wiring 31, and the tenth wiring 16 are preferably designed. If the wiring structure in the illuminating device 10A of the present embodiment is employed, it can be made 5% or less.

  In the lighting device 10A, the plurality of first wirings 11, second wirings 12, third wirings 13, fifth wirings 30, sixth wirings 28, seventh wirings 14, eighth wirings 15, ninth wirings 31, The 10 wirings 16 are formed in the same wiring layer on the substrate P1. Therefore, compared with the case where each wiring is formed in a separate wiring layer, the wiring forming process can be simplified and the lighting device 10A having high cost performance can be provided.

  In the lighting device 10A, the first terminal unit 17, the second terminal unit 18, the third terminal unit 27, the fourth terminal unit 19, and the fifth terminal unit 29 are disposed on the same side in the Y direction, and A second terminal portion 18 is disposed between the first terminal portion 17 and the fourth terminal portion 19. Therefore, the illumination device has a compact outer shape as compared with the case where the first terminal unit 17, the second terminal unit 18, the third terminal unit 27, the fourth terminal unit 19, and the fifth terminal unit 29 are arranged in different places. 10A can be realized.

  Further, the second wiring 12, the third wiring 13, the fifth wiring 30, the sixth wiring 28, the seventh wiring 14, the eighth wiring 15, the ninth wiring 31, and the tenth wiring 16 are composed of a plurality of organic EL elements 1. It arrange | positions on the outer side of the arrange | positioned area | region E1. Moreover, since the plurality of first wirings 11 have light reflectivity, the light emission from the plurality of organic EL elements 1 is not blocked by these wirings, and the top emission can efficiently extract light from the region E1. Type illumination device 10A can be provided.

(Second Embodiment)
Next, the illuminating device of 2nd Embodiment is demonstrated with reference to FIG.9 and FIG.10. FIG. 9 is a circuit diagram showing the electrical configuration of the illumination device of the second embodiment, FIG. 10A is a schematic plan view showing the configuration of the illumination device of the second embodiment, and FIG. 10B is the second embodiment. It is a schematic plan view which shows arrangement | positioning of the anode and cathode in the organic EL element of the form illuminating device. In the illumination device of the second embodiment, the configuration of the fourth wiring 26 is different from the illumination device 10A of the first embodiment. Accordingly, the same components as those of the illumination device 10A of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 9, the illumination device 10B of the present embodiment has a region E1 in which a plurality of organic EL elements 1 are arranged, and in the region E1, six in the X direction and five in the Y direction, a total of 30 Organic EL elements 1 are arranged in a matrix. The number of organic EL elements 1 arranged in the region E1 is not limited to this.

  Each anode 2 of the plurality of organic EL elements 1 is connected to a plurality (five) of first wirings 11. The anodes 2 of the six organic EL elements 1 are electrically connected in parallel to the first wiring 11 per one.

  One end of the plurality of first wirings 11 extending in the X direction is connected to the second wiring 12 extending in the Y direction. The second wiring 12 is connected to a third wiring 13 that also extends in the Y direction. One end of the third wiring 13 is connected to the second wiring 12, and a first terminal portion 17 is provided at the other end of the third wiring 13.

  The other end of the plurality of first wirings 11 extending in the X direction is connected to a seventh wiring 14 extending in the Y direction. The seventh wiring 14 is connected to an eighth wiring 15 that also extends in the Y direction. One end of the eighth wiring 15 is connected to the seventh wiring 14, and a fourth terminal portion 19 is provided at the other end of the eighth wiring 15. That is, the plurality of first wirings 11 are connected to power supply wirings at both ends in the X direction.

  The fourth wiring 26 of the organic EL element 1 has a plurality of fourth wiring branch portions 26a, 26b, 26c, 26d, 26e, and 26f that extend in the Y direction and are arranged in parallel in the X direction. One end of the fourth wiring branch portions 26a, 26b, 26c, 26d, 26e, and 26f is electrically connected to the tenth wiring 16 extending in the X direction. On the other hand, one end of the plurality of fourth wiring branch portions 26a, 26b, 26c, 26d, 26e, and 26f is electrically connected to a sixth wiring 28 extending in the X direction. The other ends of the plurality of fourth wiring branch portions 26a, 26b, 26c, 26d, 26e, and 26f are electrically connected to the tenth wiring 16 extending in the X direction. A second terminal portion 18 is provided on the tenth wiring 16. The end of the sixth wiring 28 is electrically connected to the fifth wiring 30 and the ninth wiring 31, the third terminal portion 27 is provided at the end of the fifth wiring 30, and the end of the ninth wiring 31 is provided. Is provided with a fifth terminal portion 29.

  The organic EL element 1 is provided corresponding to the intersection of the plurality of first wirings 11 and the fourth wiring branch portions 26a, 26b, 26c, 26d, 26e, and 26f, and the fourth wiring branches per one. The five organic EL elements 1 are electrically connected in parallel to the part. That is, a part of the fourth wiring branch portions 26a, 26b, 26c, 26d, 26e, and 26f functions as the cathode 8 of the connected organic EL element 1.

As shown in FIG. 10A, in the region E1, the organic EL element 1 is provided at each intersection of the plurality of first wires 11 and the fourth wire branches 26a, 26b, 26c, 26d, 26e, and 26f. ing.
In addition, the widths of the third wiring 13 and the eighth wiring 15 are larger than the second wiring 12 and the seventh wiring 14 to which both ends of the plurality of first wirings 11 are connected. Further, the fifth wiring 30 and the ninth wiring 31 are equal in width to the third wiring 13 and the eighth wiring 15.
As shown in FIG. 10B, the anode 2 of the organic EL element 1 is formed so as to overlap the first wiring 11 in plan view. The anode 2 and the first wiring 11 are electrically connected via a conductive film in a contact hole 9 a provided at a position overlapping the anode 2. The shape of the anode 2 in this embodiment is a rectangle, and the anode 2 is arranged so that the longitudinal direction thereof matches the extending direction (X direction) of the first wiring 11. The width in the short direction of the anode 2 may be the same as the width of the first wiring 11, may be slightly smaller, or may be slightly larger. Since the fourth wiring 26 has a plurality of fourth wiring branch portions 26a, 26b, 26c, 26d, 26e, and 26f, for example, fourth wiring branch portions 26c and 26d indicated by two-dot chain lines; A region E0 indicated by a broken line overlapping with the anode 2 in plan view is a region where light emission can be obtained in one organic EL element 1. In other words, the portions of the fourth wiring branch portions 26c and 26d that overlap the region E0 indicated by the broken line function as the cathode 8.

  In the lighting device 10B of the present embodiment, the fourth wiring 26 is formed by being divided into a plurality of fourth wiring branch portions 26a, 26b, 26c, 26d, 26e, and 26f. Therefore, although the electric resistance in the fourth wiring branch portion is increased as compared with the first embodiment in which the fourth wiring 26 is formed as a common wiring extending over the plurality of organic EL elements 1, one fourth wiring branch portion. It is possible to approximate the change in the potential (VCT) of the cathode 8 at a more linear.

  According to the illuminating device 10B of the present embodiment, in addition to the effects of the illuminating device 10A of the first embodiment, the change in the potential (VCT) of the cathode 8 in one fourth wiring branch becomes more linear. Therefore, it is possible to further reduce the variation in the driving voltage applied between the anode 2 and the cathode 8 in each of the plurality of organic EL elements 1, that is, the fourth wiring branch. That is, it is possible to provide the lighting device 10B in which the luminance unevenness in the plurality of organic EL elements 1 is not noticeable.

  Further, according to the illuminating device 10B, the region E0 where the light emission of the organic EL element 1 can be obtained is a portion where the anode 2 and the fourth wiring branch overlap in a plan view, and therefore the contact as in the first embodiment. As compared with the case where almost the entire anode 2 including the hole 9a emits light, uneven luminance due to the film thickness variation of the light emitting functional layer LE covering the contact hole 9a is less likely to occur.

(Third embodiment)
<Inspection device>
Next, the inspection apparatus according to the present embodiment will be described with reference to FIGS. Note that the inspection apparatus of the present embodiment includes the imaging apparatus of the present embodiment. FIG. 11 is a block diagram showing the configuration of the biometric authentication device, FIG. 12 is a schematic plan view showing the arrangement of the organic EL elements and the light receiving elements, and FIG. 13 is a schematic cross-sectional view showing the structure of the imaging device.

As shown in FIG. 11, a biometric authentication device 100 as an inspection device of the present embodiment is a device that performs personal authentication by capturing a vein image of a finger F as a living body (subject). Unit 80, output unit 90, and control unit 70 that controls these in an integrated manner. The imaging device 50 includes a light emitting unit 10 that illuminates the finger F, a light receiving unit 20, and a cover glass 60.
The cover glass 60 is a glass protective cover that covers the imaging region. A finger F (for example, the index finger of the right hand) of the person to be authenticated is placed on the cover glass 60.
The light emitting unit 10 can use the illumination device 10A of the first embodiment or the illumination device 10B of the second embodiment using the organic EL element 1 as a light source. In the imaging device 50 of the present embodiment, the illumination device 10B of the second embodiment is employed as the light emitting unit 10. Therefore, the irradiation light IL emitted from the light emitting unit 10 is near-infrared light, and its wavelength is, for example, 700 nm to 1500 nm (more preferably 800 nm to 900 nm).

  Irradiation light IL (near infrared light) emitted from the light emitting unit 10 is irradiated onto the finger F from the lower side of the cover glass 60 and scattered when reaching the inside of the finger F, and a part thereof is received as reflected light RL. Head toward the part 20 side. Reduced hemoglobin flowing through veins has the property of absorbing near infrared light. For this reason, when the finger F is imaged using an image sensor for near infrared light, the vein portion under the finger F appears darker than the surrounding tissue. The pattern due to this difference in brightness becomes a vein image. The light receiving unit 20 is an image sensor for near infrared light, and includes a plurality of light receiving elements 21 (see FIG. 12) arranged in a matrix. Each light receiving element 21 converts incident light (reflected light RL from the finger F) into an electric signal (light receiving signal) having a signal level corresponding to the amount of light.

  Although the specific structure of the imaging device 50 will be described later, as shown in FIG. 11, the light emitting unit 10 and the light receiving unit 20 are on the same side with respect to the finger F placed on the cover glass 60 (in the drawing). Located on the lower side. In addition, the light emitting unit 10 is located closer to the cover glass 60 (upper side in the drawing) than the light receiving unit 20.

  The storage unit 80 is a non-volatile memory such as a flash memory or a hard disk, and stores a vein image of a finger F registered in advance (for example, the index finger of the right hand) as a master vein image for personal authentication. The control unit 70 includes a CPU and a RAM, and controls turning on and off of the light emitting unit 10. In addition, the control unit 70 reads a light reception signal from each light receiving element 21 provided in the light receiving unit 20, and generates a vein image of the finger F based on the read light reception signal for one frame (for the imaging region). In addition, the control unit 70 collates the generated vein image with the master vein image registered in the storage unit 80 and performs personal authentication. For example, the control unit 70 compares the characteristics of two vein images to be collated (for example, the number and position of branching of veins), and when the similarity is equal to or higher than a predetermined threshold, The person who puts the finger F on is authenticated as the person whose master vein image is registered in the storage unit 80. The output unit 90 is, for example, a display unit or a voice notification unit, and notifies the authentication result by display or voice.

  As shown in FIG. 12, the organic EL element 1 as the light source of the illumination device 10 </ b> B that is the light emitting unit 10 is at the intersection of the plurality of first wirings 11 and the fourth wiring branch portions 26 c and 26 d that function as the cathode 8. Provided and arranged in a matrix. The light receiving element 21 of the light receiving unit 20 is, for example, a photodiode, and is disposed in a gap formed by the plurality of first wirings 11 and the fourth wiring branch portions 26c and 26d intersecting each other. That is, four organic EL elements 1 are arranged around one light receiving element 21 in plan view. The light receiving elements 21 are also arranged in a matrix.

  As illustrated in FIG. 13, the imaging device 50 has a structure in which the light receiving unit 20, the light emitting unit 10, and the light collecting unit 40 are stacked in this order. The light receiving unit 20 includes a plurality of light receiving elements 21 arranged in a matrix as described above on the transparent or opaque substrate P2. The light receiving unit 20 includes a transparent substrate P3. The substrate P3 is disposed to face the substrate P2, and a light shielding layer 22 is formed on the surface of the substrate P3 on the substrate P2 side. An opening (pinhole) 23 is formed in the light shielding layer 22 at a position corresponding to the opposing light receiving element 21. The light shielding layer 22 is opposed to the light receiving elements 21 arranged in a matrix, and prevents unnecessary light from entering the light receiving elements 21, and is also called a black matrix (BM).

  The light emitting unit 10 includes a plurality of organic EL elements 1 arranged in a matrix via an insulating layer 9 on a transparent substrate P1. In FIG. 13, the display of wiring such as the first wiring 11 is omitted.

  A light collecting unit 40 is provided so as to correspond to the light emitting unit 10. The condensing part 40 has the transparent board | substrate P4 and the some micro lens 41 provided in the side corresponding to the organic EL element 1 of the board | substrate P4. The microlenses 41 are also arranged on the substrate P4 in a matrix corresponding to the light receiving elements 21 of the light receiving unit 20. That is, the condensing part 40 is a micro lens array (MLA).

  The light receiving unit 20, the light emitting unit 10, and the light collecting unit 40 are arranged at predetermined intervals. In particular, the substrate P3 corresponds to the substrate P2 provided with the light receiving element 21 and the substrate P4 provided with the microlens 41 according to the optical characteristics (condensation degree, focal length, etc.) of the microlens 41 in the condensing unit 40. The relative position and the size of the opening 23 are determined. It is preferable that spaces are formed between the substrate P2 and the substrate P3, between the substrate P3 and the substrate P1, and between the substrate P1 and the substrate P4. In addition, it is more preferable that the distance between the substrates is constant so that the amount of light that can be received by each light receiving element 21 does not vary.

The illumination light (near infrared light) IL emitted from the organic EL element 1 of the light emitting unit 10 illuminates the finger F as a living body (subject) as described above, and the reflected light RL reflected from the finger F is microscopic. The light is collected by the lens 41. Further, the light passes through the opening (pinhole) 23 of the light shielding layer 22 and enters the light receiving element 21 in a state where unnecessary light such as outside light is removed.
Each light receiving element 21 converts the reflected light RL (near infrared light) incident on the light receiving surface into a light receiving signal having a signal level corresponding to the amount of light.
The imaging device 50 according to the present embodiment employs an illumination device 10B as the light emitting unit 10. Therefore, the finger F as a living body (subject) can be illuminated evenly in brightness. In addition, as shown in FIG. 12, since there are no wiring or electrodes that block the reflected light RL on the light receiving element 21, it is possible to provide an imaging device 50 that is highly sensitive to the reflected light RL. Note that the lighting device 10 </ b> A of the first embodiment may be employed as the light emitting unit 10.

  According to such a biometric authentication device 100, the imaging device 50 including the light emitting unit 10 that can emit near-infrared light with reduced luminance unevenness and illuminate the finger F, and the finger F with high contrast. Therefore, high authentication accuracy can be realized.

  The inspection device to which the illumination device 10A of the first embodiment and the illumination device 10B of the second embodiment from which near infrared light can be obtained is not limited to the biometric authentication device 100. For example, it can be suitably used as an illumination device such as a mammography device or a blood component analyzer.

  Electronic devices to which the illumination device 10A of the first embodiment and the illumination device 10B of the second embodiment can be applied are not limited to the biometric authentication device 100 and the like. For example, if a light emitting material in the light emitting layer 5 is selected so that light emission of visible light wavelength such as white can be obtained from the organic EL element 1, it can be used as a general lighting device. Further, it can be suitably used as an illumination device (backlight or frontlight) for a light-receiving display device such as a liquid crystal display device or an electrophoretic display device. Furthermore, it can be suitably used as an illuminating device for electronic devices including these light receiving display devices such as information terminal devices such as personal computers and mobile phones.

  The present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification. An imaging device, an inspection device, and an electronic device to which the illumination device is applied are also included in the technical scope of the present invention. Various modifications other than the above embodiment are conceivable. Hereinafter, a modification will be described.

  (Modification 1) In the lighting devices 10A and 10B, the second wiring 12 and the third wiring 13 are arranged on one end side of the plurality of first wirings 11 extending in the X direction, and the other end side. Although the seventh wiring 14 and the eighth wiring 15 are arranged in the above, it is not limited to this. For example, the seventh wiring 14 and the eighth wiring 15 may be deleted, and the wiring electrically connected to the plurality of first wirings 11 may be the second wiring 12 and the third wiring 13. The illumination devices 10A and 10B can be miniaturized by reducing the wiring.

  (Modification 2) In the illumination devices 10A and 10B, the arrangement of the plurality of organic EL elements 1 in the region E1 is not limited to this. FIG. 14 is a schematic plan view showing the arrangement of a modified organic EL element. For example, as shown in FIG. 14, the arrangement of the anodes 2 on the plurality of first wirings 11 in the X direction may be varied every other line. Thereby, it becomes possible to arrange a plurality of organic EL elements 1 with higher density per unit area.

  (Modification 3) In the lighting devices 10A and 10B, a plurality of first wirings 11, second wirings 12, third wirings 13, fifth wirings 30, sixth wirings 28, and seventh wirings formed on the substrate P1. 14, the eighth wiring 15, the ninth wiring 31, and the tenth wiring 16 are preferably formed of the same conductive material in the same wiring layer. However, different types of conductive materials may be stacked. .

  (Modification 4) In the illumination devices 10A and 10B, the second wiring 12, the third wiring 13, the fifth wiring 30, the sixth wiring 28, and the seventh wiring outside the region E1 where the organic EL element 1 is disposed. 14, the eighth wiring 15, the ninth wiring 31, and the tenth wiring 16 are disposed, but all or a part of these wirings may be included in the region E <b> 1.

  (Modification 5) In the illumination devices 10A and 10B, the anode 2 as the first electrode is disposed on the first wiring 11, but the present invention is not limited to this. For example, the anode 2 may be disposed so as to be positioned between the first wirings 11 in the Y direction and partially overlap the first wirings 11.

  DESCRIPTION OF SYMBOLS 1 ... Organic EL element, 2 ... Anode as 1st electrode, 5 ... Light emitting layer, 8 ... Cathode, 9 ... Insulating layer, 9a ... Contact hole, 10 ... Light emission part, 10A, 10B ... Illuminating device, 11 ... 1st Wiring, 12 ... 2nd wiring, 13 ... 3rd wiring, 14 ... 7th wiring, 15 ... 8th wiring, 16 ... 10th wiring, 17 ... 1st terminal part, 18 ... 2nd terminal part, 19 ... 4th Terminal part, 20 ... light receiving part, 21 ... light receiving element, 22 ... light shielding layer, 23 ... opening part, 26 ... fourth wiring, 26a, 26b, 26c, 26d, 26e, 26f ... fourth wiring branch part, 27 ... first 3 terminal part, 28 ... 6th wiring, 29 ... 5th terminal part, 30 ... 5th wiring, 31 ... 9th wiring, 41 ... Microlens, 50 ... Imaging device, 70 ... Control part, 100 ... Inspection device Biometric authentication device, E1... Region where organic EL elements are arranged, P1... Substrate.

Claims (16)

A lighting device having a region in which a plurality of organic EL elements each having a light emitting layer between a first electrode and a second electrode are disposed on a substrate,
A plurality of first wirings extending in a first direction and parallel to each other in a second direction intersecting the first direction;
A second wiring extending in the second direction and connected to one end of the plurality of first wirings;
A third wiring extending in the second direction and provided outside the second wiring and having one end connected to the second wiring;
A first terminal connected to the other end of the third wiring;
A fourth wiring extending in at least the region extending in the first direction and the second direction;
A fifth wiring extending in the second direction and provided outside the third wiring;
Extending in the first direction, electrically connected to one end of the fourth wiring on the opposite side of the first terminal portion in the second direction, and one of the fifth wiring A sixth wiring connected to the end;
A second terminal portion to which the other end of the fourth wiring in the second direction is connected;
A third terminal portion to which the other end of the fifth wiring is connected,
The first electrode is connected to one of the plurality of first wirings,
A part of said 4th wiring is functioning as said 2nd electrode, The illuminating device characterized by the above-mentioned. A lighting device having a region in which a plurality of organic EL elements each having a light emitting layer between a first electrode and a second electrode are disposed on a substrate,
A plurality of first wirings extending in a first direction and parallel to each other in a second direction intersecting the first direction;
A second wiring extending in the second direction and connected to one end of the plurality of first wirings;
A third wiring extending in the second direction and provided outside the second wiring and having one end connected to the second wiring;
A first terminal connected to the other end of the third wiring;
A fourth wiring having a plurality of fourth wiring branches extending in the second direction and spaced in parallel in the first direction at least in the region;
A fifth wiring extending in the second direction and provided outside the third wiring;
Extending in the first direction, electrically connected to one end of the plurality of fourth wiring branches on the opposite side of the first terminal portion in the second direction, and the fifth A sixth wiring connected to one end of the wiring;
A second terminal portion to which the other end in the second direction of the plurality of fourth wiring branch portions is connected;
A third terminal portion to which the other end of the fifth wiring is connected,
The first electrode is connected to one of the plurality of first wirings,
A part of the fourth wiring branch part functions as the second electrode;
The organic EL element is provided corresponding to an intersection of the plurality of first wirings and the plurality of fourth wiring branch portions. A seventh wiring extending in the second direction and connected to the other end of the plurality of first wirings;
An eighth wiring extending in the second direction and provided outside the seventh wiring and having one end connected to the seventh wiring;
A fourth terminal portion to which the other end of the eighth wiring is connected;
A ninth wiring provided outside the eighth wiring and having one end connected to the sixth wiring;
A fifth terminal portion to which the other end of the ninth wiring is connected,
The first terminal portion, the second terminal portion, the third terminal portion, the fourth terminal portion, and the fifth terminal portion are arranged on the same side in the second direction. Or the illuminating device of 2.   The at least 1 1st wiring located in the center side of the said area | region among these 1st wiring is a width | variety larger than the other 1st wiring, The Claim 1 characterized by the above-mentioned. The lighting device described.   The plurality of first wirings, the second wirings, the third wirings, the fifth wirings, the sixth wirings, the seventh wirings, the eighth wirings, and the ninth wirings in the same layer on the substrate. The lighting device according to claim 3, wherein the lighting device is provided. The plurality of first wirings are provided over at least the region,
The second wiring, the third wiring, the fifth wiring, the sixth wiring, the seventh wiring, the eighth wiring, and the ninth wiring are provided outside the region. The lighting device according to any one of claims 3 to 5. The width of the third wiring is larger than that of the second wiring,
The lighting device according to claim 3, wherein a width of the eighth wiring is larger than that of the seventh wiring. The width of the fifth wiring is equal to the third wiring,
The lighting device according to claim 3, wherein a width of the ninth wiring is equal to that of the eighth wiring. An insulating layer covering the plurality of first wirings on the substrate;
A plurality of contact holes provided in a portion of the insulating layer overlapping the plurality of first wirings,
The first electrode is provided so as to overlap with one first wiring of the plurality of first wirings, and the first electrode is formed by a conductive film formed in at least one of the plurality of contact holes. The lighting device according to claim 1, wherein the lighting device is electrically connected to one wiring. The plurality of first wirings are made of a conductive material having light reflectivity,
The lighting device according to claim 9, wherein the first electrode and the fourth wiring are made of a light-transmitting conductive material.   The lighting device according to claim 10, wherein the conductive film formed in the at least one contact hole is made of a conductive material having the same light transmittance as that of the first electrode. A tenth wiring extending in the first direction and electrically connecting the fourth wiring and the second terminal portion;
12. The lighting device according to claim 1, wherein the tenth wiring is made of a conductive material having a resistance lower than that of the fourth wiring.   The tenth wiring is provided outside the region, and the plurality of first wirings, the second wiring, the third wiring, the fifth wiring, the sixth wiring, and the seventh wiring are provided on the substrate. The lighting device according to claim 12, wherein the lighting device is formed in the same layer as the wiring, the eighth wiring, and the ninth wiring.   An electronic apparatus comprising the illumination device according to any one of claims 1 to 13. A lighting device according to any one of claims 1 to 13,
An imaging apparatus comprising: a light receiving element that captures an image of a subject illuminated by the illumination apparatus. A lighting device according to any one of claims 1 to 13,
A light receiving element that captures an image of a subject illuminated by the illumination device;
And a control unit that performs inspection based on a detection result of the light receiving element.

Images