JP2017016739A - Organic EL display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an organic EL display device capable of preventing color mixture between pixels caused by movement of electric charges along an electric charge generation layer.SOLUTION: An electric charge generation layer 5 is formed between two light-emitting units 3A and 3B. The electric charge generation layer 5 has: a first layer 5p that supplies either one electric charges of electrons or positive holes to one light-emitting unit; and a second layer 5n that receives the other electric charges from the first layer 5p and supplies the other electric charges to the other light-emitting unit. The electric charge generation layer 5 includes an insulating layer 5i formed between the first layer 5p and the second layer 5n.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an organic EL display device including a charge generation layer.

  Development of an organic EL element called a multi-photon emission element is underway. As disclosed in Patent Document 1, this type of element includes a plurality of light emitting units each including a light emitting layer and a charge transport layer, and has a charge generation layer between two stacked light emitting units. doing. When a voltage is applied to the organic EL element, the charge generation layer supplies electrons and holes to the two light emitting units sandwiching the charge generation layer. A first layer (for example, a layer of vanadium pentoxide, F4-TCNQ, or the like) that supplies holes to the cathode side light emitting unit, receives electrons from the first layer, and receives the received electrons to the anode side light emitting unit. A charge generation layer is constituted by the second layer to be supplied, and an electron injection material doped with an alkali metal or an alkaline earth metal may be used as a material of the second layer.

JP 2011-249349 A

  In general, a material having a relatively high electrical resistivity is used as the material of the first layer. However, in the conventional charge generation layer, since the two layers are laminated, the alkali metal or alkaline earth metal doped in the second layer diffuses into the first layer, and as a result, the first layer The electrical resistivity may decrease near the interface of the layers. In this case, electrons generated in the first layer flow along the interface of the first layer before moving to the second layer. In the organic EL display device, when such a flow of electrons along the first layer is caused by causing a certain pixel to emit light, a pixel adjacent to the light-emitting pixel emits light by a current along the first layer. As a result, color mixing occurs between two adjacent pixels.

  An object of the present invention is to provide an organic EL display device capable of preventing color mixing between pixels resulting from movement of charges along a charge generation layer.

  The organic EL display device according to the present invention includes a plurality of pixels, a cathode formed on the plurality of pixels, an anode facing the cathode, and a stack between the cathode and the anode, Includes at least two light emitting units each including a light emitting layer, and a charge generation layer formed between the at least two light emitting units. The charge generation layer receives from the first layer a first layer that supplies one charge of electrons and holes to one light emitting unit of the at least two light emitting units, and the other charge from the first layer. And a second layer for supplying the other charge to the other light emitting unit. The charge generation layer of at least one pixel of the plurality of pixels includes an insulating layer formed between the first layer and the second layer.

  According to the present invention, the charge can be prevented from flowing along the charge generation layer by the insulating layer, and as a result, color mixing between pixels can be prevented.

1 is a plan view of an organic EL display device according to an embodiment of the present invention. It is sectional drawing of the TFT substrate which comprises an organic electroluminescence display. In this figure, a cross section of one pixel is shown. It is a figure which shows the laminated structure of an organic EL element. It is a figure which shows the example of the energy level of the several layer which comprises an organic EL element. It is a figure for demonstrating the operation | movement mechanism of an electric charge generation layer. It is a figure which shows the modification of a charge generation layer. It is a figure which shows another modification of a charge generation layer. It is a figure for demonstrating the operation | movement mechanism of the electric charge generation layer shown in FIG.

  Hereinafter, an embodiment of the present invention will be described. It should be noted that the disclosure of this specification is merely an example, and any modifications that can be easily conceived by those skilled in the art while maintaining the gist of the present invention are included in the scope of the present invention.

  FIG. 1 is a plan view of an organic EL (electroluminescence) display device 1 according to the present invention. FIG. 2 is a cross-sectional view of the organic EL display device 1.

  In the display device 1, a display area D including a plurality of pixels is defined. In the display area D, a plurality of pixels that respectively emit light in a plurality of colors are defined. For example, the display device 1 includes a red pixel, a green pixel, a blue pixel, and a white pixel as a plurality of pixels. The color of the pixel and the number of colors are not limited to this, and may be changed as appropriate. Further, the arrangement of the pixels is not particularly limited. For example, four pixels having different colors are arranged in two columns and two rows. Further, three or four pixels having different colors may be arranged in one direction.

  The display device 1 has a TFT substrate 10. Further, the display device 1 may include a counter substrate 9 that faces the TFT substrate 10. The base material 10a (FIG. 2) of the TFT substrate 10 is, for example, glass or plastic. As shown in FIG. 2, the TFT substrate 10 has a circuit layer C. The circuit layer C includes a TFT 11 that controls a current supplied to an organic EL element described later. The TFT 11 is formed in each of a plurality of pixels. The TFT 11 has a semiconductor layer 12, a gate electrode 13, a source electrode 14, and a drain electrode 15. In an example of the display device 1, the semiconductor layer 12 is covered with a gate insulating film 21. The gate electrode 13 is formed on the gate insulating film 21 and is covered with the interlayer insulating film 22. The source electrode 14 and the drain electrode 15 are formed on the interlayer insulating film 22. The structure of the TFT 11 is not limited to that shown in FIG. 2, and may be changed as appropriate. The circuit layer C is covered with a passivation film 23. In the example shown in FIG. 2, a planarizing film 24 made of a resin such as acrylic is formed on the passivation film 23.

  As shown in FIG. 2, the TFT substrate 10 has an anode 2 and a cathode 4 facing the anode 2. Between the anode 2 and the cathode 4, the organic layer 3 which has the light emitting layer mentioned later and a charge transport layer is formed. The anode 2 is formed on the planarizing film 24. The display device 1 has a plurality of anodes 2, which are provided in a plurality of pixels, respectively. The anode 2 is connected to the drain electrode 15 of the TFT 11 through a contact hole. The cathode 4 is formed over a plurality of pixels. That is, the cathode 4 is continuous in a plurality of pixels. A sealing film 26 may be formed on the cathode 4. An example of the organic EL display device 1 is a top emission type. In this case, as the material of the cathode 4, for example, a transparent conductive material such as ITO, IZO, or ZnO can be used. The anode 2 is composed of a light-reflective metal film, or a laminated film of such a metal film and a transparent conductive film, for example, an AlNd alloy film, a laminated film of ITO and Ag, or an IZO and silver film. A laminated film can be used. The organic EL display device 1 may be a bottom emission type. In this case, the anode 2 is formed of a transparent conductive material, and the cathode 4 includes a material that reflects light. The materials of the anode 2 and the cathode 4 are not limited to those described above, and may be changed as appropriate.

  As shown in FIG. 2, a bank layer 25 may be formed on the anode 2. The bank layer 25 has an opening (bank opening) A that exposes the anode 2 in each pixel. The organic layer 3 is formed on the anode 2 and the bank layer 25 and is in contact with the anode 2 inside the bank opening A. In one example, the organic layer 3 is formed over a plurality of pixels. That is, the organic layer 3 is continuous in a plurality of pixels. In this case, the organic layer 3 may be configured to emit white light, for example, and each pixel may be provided with a color filter that converts the white light into the color of the pixel. In another example, the organic layer 3 may be formed independently for each of the plurality of pixels. That is, a light emitting layer that emits light in the color of the pixel may be formed in each pixel. For example, a red light emitting layer may be formed in the red pixel, a green light emitting layer may be formed in the green pixel, and a blue light emitting layer may be formed in the blue pixel.

  The anode 2, the organic layer 3, and the cathode 4 constitute an organic EL element. FIG. 3 is a cross-sectional view showing a laminated structure of elements. The light-emitting EL element according to this embodiment is a multi-photon emission element. That is, the organic layer 3 includes a light emitting layer and includes a plurality of light emitting units that are stacked. A charge generation layer is formed between two opposing light emitting units. In the example of FIG. 3, the organic layer 3 includes a first light emitting unit 3A and a second light emitting unit 3B. A charge generation layer 5 is formed between the light emitting units 3A and 3B. The first light emitting unit 3A is formed on the cathode 4 side with respect to the charge generation layer 5, and the second light emitting unit 3B is formed on the anode 2 side with respect to the charge generation layer 5. The organic layer 3 may include more than two light emitting units. In this case, the organic layer 3 may have a plurality of charge generation layers, and each charge generation layer may be formed between two opposing light emitting units.

  As shown in FIG. 3, each of the light emitting units 3A and 3B has a light emitting layer 3c. The light emitting layer 3c is a layer that emits light by recombination of electrons and holes. The light emission colors of the light emitting layers 3c constituting the plurality of light emitting units 3A and 3B may be the same or different from each other. That is, the light emitting material of the light emitting layer 3c constituting the plurality of light emitting units 3A and 3B may be the same or different from each other. As the material of the light emitting layer 3c, for example, a fluorescent light emitting material such as Alq3 (tris (8-quinolinolato) aluminum) or “tris (2-phenylpyridinato-N, C2 ′) iridium (III)” (Ir (Ppy) 3), “tris (1-phenylisoquinoline) iridium (III)” (Ir (piq) 3), “bis [2- (4 ′, 6′-difluorophenyl) pyridinato-N, C2 ′] Various light emitting materials such as phosphorescent light emitting materials such as “iridium (III) picolinate” (FIrpic) can be used. The material of the light emitting layer 3c is not limited to these, You may change suitably.

  As shown in FIG. 3, the light emitting units 3A and 3B have an electron transport layer 3b that transports injected electrons to the light emitting layer 3c on the cathode 4 side of the light emitting layer 3c. As the electron transport layer 3b, for example, Alq3 or BCP (Bathocuproin) can be used. The light emitting units 3A and 3B have a hole transport layer 3d that transports injected holes to the light emitting layer 3c on the anode 2 side of the light emitting layer 3c. As the hole transport layer 3d, NPB (4,4′-bis [N- (1-naphthyl) -N-phenylamino] biphenyl) or TPD (N, N′-bis (3-methylphenyl) -N , N′-diphenyl- [1,1′-biphenyl] -4,4′-diamine) can be used. Further, the light emitting units 3A and 3B have a hole injection layer 3e that lowers a hole injection barrier from the anode 2 or the charge generation layer 5 to be described later to the hole transport layer 3d on the anode 2 side of the hole transport layer 3d. May be. The first light emitting unit 3A may have an electron injection layer 3a that lowers an electron injection barrier from the cathode 4 to the electron transport layer 3b on the cathode 4 side of the electron transport layer 3b. Each of these layers can be formed by a method such as a vacuum deposition method, a coating method, or a printing method.

  FIG. 4 is a schematic view showing an example of energy levels of a plurality of layers constituting the organic layer 3. When a voltage is applied between the anode 2 and the cathode 4, holes are injected from the anode 2 into the HOMO of the hole injection layer 3e of the second light emitting unit 3B. The holes move through the hole transport layer 3d to the HOMO of the light emitting layer 3c of the second light emitting unit 3B. Further, when a voltage is applied between the anode 2 and the cathode 4, electrons are injected from the charge generation layer 5 into the LUMO of the electron transport layer 3b of the second light emitting unit 3B. The electrons move from the LUMO of the electron transport layer 3b to the LUMO of the light emitting layer 3c, and recombine with holes in the light emitting layer 3c to generate excitons. Thereby, the light emitting layer 3c of the second light emitting unit 3B emits light. Similarly, when a voltage is applied between the anode 2 and the cathode 4, electrons are injected from the cathode 4 into the LUMO of the electron injection layer 3a of the first light emitting unit 3A. The electrons move through the electron transport layer 3b to the LUMO of the light emitting layer 3c. At this time, holes are injected from the charge generation layer 5 into the HOMO of the hole injection layer 3e of the first light emitting unit 3A. The holes move through the hole transport layer 3d to HOMO of the light emitting layer 3c, and recombine with electrons in the light emitting layer 3c to generate excitons. Thereby, the light emitting layer 3c of the first light emitting unit 3A emits light.

  As shown in FIGS. 3 and 4, the charge generation layer 5 includes a first layer 5p and a second layer 5n. In the example of FIGS. 3 and 4, the second layer 5n is disposed on the anode 2 side with respect to the first layer 5p. The first layer 5p supplies holes to the layer disposed on the cathode 4 side of the first layer 5p when a voltage is applied to the electrodes 2 and 4, and the anode of the first layer 5p. It is a layer which supplies an electron to the layer arrange | positioned at 2 side. In the example of FIG. 3 and FIG. 4, the first layer 5p supplies holes to the first light emitting unit 3A and supplies electrons to the second layer 5n. The second layer 5n receives electrons from the first layer 5p, and electrons to the second light emitting unit 3B (more specifically, the electron transport layer 3b) formed on the anode 2 side of the second layer 5n. This is the supply layer.

  Examples of the material for the first layer 5p include metal oxides such as vanadium oxide (V2O5), molybdenum oxide (MoO3), and rhenium oxide (Re2O7), tetrafluoro-tetracyano-quinodimethane (F4-TCNQ), and hexaaza. An organic material such as triphenylene hexacarbonitrile (HATCN6) can be used.

  As a material of the second layer 5n, an electron injection material doped with at least one of an alkali metal, an alkaline earth metal, an alkali metal oxide, and an alkaline earth metal oxide can be used. For example, as the electron injection material, an organic material such as Alq3 (tris (8-quinolinolato) aluminum) or BCP (bathocuproine) is doped with at least one of alkali metal, alkaline earth metal, and oxides thereof. Can be used. Examples of the alkali metal include Li, Na, K, Rb, Cs, and Fr, and examples of the alkaline earth metal include Be, Mg, Ca, Sr, Ba, and Ra.

  The charge generation layer 5 has an insulating layer 5i between the first layer 5p and the second layer 5n. As will be described later, this insulating layer 5i can prevent color mixing between two adjacent pixels. In one example, the insulating layer 5i is formed over a plurality of pixels. That is, the insulating layer 5i is continuously formed in a plurality of pixels. In this case, the insulating layer 5i is also present in the light emitting region (bank opening A) of each pixel. Therefore, the material of the insulating layer 5i is preferably a transparent insulating layer. The material and thickness of the insulating layer 5i are set so that electrons generated in the first layer 5p move to the second layer 5n by the tunnel effect. That is, the material and thickness of the insulating layer 5i are set such that a tunnel current flows from the first layer 5p to the second layer 5n. As a material of the insulating layer 5i, a transparent insulating material such as silicon oxide or silicon nitride can be used. The thickness of the insulating layer 5i is, for example, several nanometers. The first layer 5p, the second layer 5n, and the insulating layer 5i can be formed by, for example, a chemical vapor deposition (CVD) method.

  FIG. 5 is a diagram for explaining the operation mechanism of the charge generation layer 5. FIG. 5A shows a charge generation layer 5 having an insulating layer 5i. FIG. 5B shows a charge generation layer 5S that has the first layer 5p and the second layer 5n described above, but does not have the insulating layer 5i.

  As shown in FIG. 5B, the charge generation layer 5S is not provided with the insulating layer 5i. Therefore, the alkali metal, alkaline earth metal, or oxide thereof contained as the dopant in the second layer 5n diffuses into the first layer 5p, and as a result, close to the interface of the first layer 5p. The electrical resistivity decreases. Since the LUMO energy level of the second layer 5n is higher than the LUMO energy level of the first layer 5p, the electrons generated in the first layer 5p are the interface of the first layer 5p as indicated by the arrows in the figure. To accumulate. In the charge generation layer 5S, since the electrical resistivity is reduced near the interface of the first layer 5p, the first layer 5p is formed before the energy barrier between the first layer 5p and the second layer 5n is exceeded. Flows to the next pixel along the interface. As a result, color mixing between two adjacent pixels tends to occur.

  On the other hand, the charge generation layer 5 of the present embodiment has an insulating layer 5i as shown in FIG. Therefore, it is possible to prevent the dopant of the second layer 5n from diffusing into the first layer 5p, and as a result, it is possible to suppress a decrease in electrical resistivity near the interface of the first layer 5p. For this reason, since it can suppress that the electron generated in the 1st layer 5p flows along the interface of the 1st layer 5p, color mixing in two adjacent pixels can be suppressed. Electrons generated in the first layer 5p move to the second layer 5n by the tunnel effect.

  As a material for the insulating layer 5i, an inorganic material is preferably used. Inorganic materials generally have a small atomic spacing. Therefore, by using an inorganic material, it is possible to effectively prevent the dopant of the second layer 5n from diffusing into the first layer 5p.

  The insulating layer 5i preferably has an electric resistivity higher than that of the first layer 5p when the dopant of the second layer 5n diffuses from the second layer 5n to the interface of the first layer 5p. That is, the insulating layer 5i preferably has a higher electrical resistivity than the portion on the second layer 5n side in the first layer 5p shown in FIG. By using such a material for the insulating layer 5i, the flow of electrons toward the adjacent pixels can be effectively suppressed. More preferably, the insulating layer 5i has a higher electrical resistivity than the material constituting the first layer 5p. By doing so, it is possible to more effectively suppress the flow of electrons toward the adjacent pixel. As the material of the insulating layer 5i, for example, silicon oxide or silicon nitride can be used as described above. Note that the electrical resistivity of the first layer 5p itself (the electrical resistivity in a state in which the dopant is not diffused) is high to the extent that no electron flows in the direction along the first layer 5p, and When the insulating layer 5i suppresses the diffusion of the dopant into the first layer 5p, the electrical resistivity of the insulating layer 5i is not necessarily limited to that described above.

  The insulating layer 5i is not necessarily formed over a plurality of pixels. That is, each pixel may include a region where the insulating layer 5i is formed and a region where the insulating layer 5i is not formed. FIG. 6 is a diagram showing the charge generation layer 5 having such a configuration. As shown in this figure, each pixel has a plurality of regions in which the insulating layer 5i is formed and located apart from each other in the light emitting region (the region of the bank opening A shown in FIG. 2). Also good. That is, the insulating layer 5i may be formed in a dispersed manner in the light emitting region. According to such a charge generation layer 5, in a region where the insulating layer 5i is not formed, electrons can be moved from the first layer 5p to the second layer 5n without the tunnel effect, and the insulating layer 5i In the region where is formed, electrons can be transferred from the first layer 5p to the second layer 5n by the tunnel effect. In addition, the insulating layer 5i can suppress electrons from flowing along the interface of the first layer 5p.

  Further, the insulating layer 5i may be formed only between two adjacent pixels. That is, the insulating layer 5i has the insulating layer 5i only in a region that does not emit light because the bank layer 25 is formed, that is, a region surrounding the light emitting region, and the insulating layer 5i may not be formed in the light emitting region. . By doing so, electrons can be moved from the first layer 5p to the second layer 5n in the region where the insulating layer 5i is not formed without being caused by the tunnel effect.

  FIG. 7 is a view showing still another modified example of the charge generation layer 5. In this figure, an organic EL element having a charge generation layer 105 in place of the charge generation layer 5 is shown. In this figure, the same reference numerals are given to the same portions as described above.

  The charge generation layer 105 is formed between the first light emitting unit 3A and the second light emitting unit 3B. The charge generation layer 105 includes the first layer 5p and the second layer 5n described above. In the charge generation layer 105, unlike the charge generation layer 5, the second layer 5n is formed on the cathode 4 side with respect to the first layer 5p. Accordingly, in the example of FIG. 7, the first layer 5p supplies electrons to the second light emitting unit 3B (more specifically, the electron transport layer 3b). Further, as will be described in detail later, the second layer 5n receives holes from the first layer 5p and is formed on the first light emitting unit 3A (more specifically, formed on the cathode 4 side of the second layer 5n). Supplies electrons to the hole injection layer 3e). The material of the first layer 5p is the same as that of the first layer 5p shown in FIGS. 3 and 5A, for example, a metal oxide such as V2O5, MoO3, Re2O7, or an organic material such as F4-TCNQ or HATCN6. Can be used. The material of the second layer 5n is the same as that of the second layer 5n shown in FIGS. 3 and 5A. For example, an organic material such as Alq3 or BCP is made of an alkali metal, an alkaline earth metal, or an oxide thereof. Doped electron injection materials can be used.

  The charge generation layer 105 has an insulating layer 5i between the first layer 5p and the second layer 5n. As the material of the insulating layer 5i, the same material as that of the insulating layer 5i used in the charge generation layer 5 can be used. That is, the insulating layer 5i of the charge generation layer 105 has a higher electrical resistivity than the first layer 5p when the dopant diffuses from the second layer 5n to the first layer 5p. As the material of the insulating layer 5i, as described above, for example, silicon oxide or silicon nitride can be used. The insulating layer 5i can prevent the dopant of the second layer 5n from diffusing into the first layer 5p.

  In the embodiment having the charge generation layer 105, charges can be supplied from the first layer 5p to the second layer 5n using an avalanche mechanism. FIG. 8 is a diagram for explaining the operation mechanism of the charge generation layer 105.

  When a voltage is applied between the anode 2 and the cathode 4, holes and electrons are generated in HOMO and LUMO of the first layer 5p, respectively. Electrons move to the layer formed on the anode 2 side of the first layer 5p, specifically, the second light emitting unit 3B, and holes generated in the first layer 5p move toward the insulating layer 5i. To do. When the voltage applied between the anode 2 and the cathode 4 is high, holes generated in the first layer 5p may cause impact ionization in the process of passing through the first layer 5p and / or the insulating layer 5i (ava) Lanche surrender). In addition, when the voltage applied between the anode 2 and the cathode 4 is high, electrons generated in the first layer 5p can cause impact ionization in the process of passing through the first layer 5p (avalanche breakdown). Electrons generated by impact ionization move toward the anode 2, and holes generated by impact ionization move to the second layer 5n. 7 and 8 also, since the insulating layer 5i is formed between the first layer 5p and the second layer 5n, the charge moves along the interface of the first layer 5p. Can be prevented. Note that since the voltage applied between the anode 2 and the cathode 4 is high, impact ionization (avalanche breakdown) may occur in the second layer 5n. In this case, electrons generated in the second layer 5n due to impact ionization move toward the anode 2, pass through the insulating layer 5i by the tunnel effect, and move to the first layer 5p. On the other hand, holes generated in the second layer 5n due to impact ionization move toward the cathode 4, and move to the first light emitting unit 3A (more specifically, the hole injection layer 3e of the first light emitting unit 3A). To do.

  The present invention is not limited to the above-described embodiments, and various modifications can be made. The configurations described in the embodiments can be replaced with substantially the same configurations, configurations that exhibit the same operational effects, or configurations that can achieve the same purpose.

  For example, in FIG. 2, the cathode 4 may be formed on the planarizing film 24 and the anode 2 may be formed on the organic layer 3.

  1 organic EL display device, 2 anode, 3 organic layers, 3A, 3B light emitting unit, 3a electron injection layer, 3b electron transport layer, 3c light emission layer, 3d hole transport layer, 3e hole injection layer, 4 cathode, 5 charge Generation layer, 5i insulating layer, 5p first layer, 5n second layer, 105 charge generation layer.

Claims (13)

A plurality of pixels;
A cathode formed on the plurality of pixels;
An anode facing the cathode;
At least two light emitting units stacked between the cathode and the anode, each including a light emitting layer;
A charge generation layer formed between the at least two light emitting units,
The charge generation layer receives from the first layer a first layer that supplies one charge of electrons and holes to one light emitting unit of the at least two light emitting units, and the other charge from the first layer. A second layer for supplying the other light-emitting unit with the other charge,
The organic EL display, wherein the charge generation layer of at least one of the plurality of pixels includes an insulating layer formed between the first layer and the second layer. apparatus. The second layer includes at least one of an alkali metal, an alkaline earth metal, an alkali metal oxide, and an alkaline earth metal oxide as a dopant. Organic EL display device. The insulating layer has an electric resistivity higher than that of the first layer when the dopant diffuses from the second layer to the interface of the first layer. The organic EL display device described. The organic EL display device according to claim 1, wherein the insulating layer is formed of a material having a higher electrical resistivity than the first layer. The organic EL display device according to claim 1, wherein the insulating layer is formed of an inorganic material. The organic EL display device according to claim 5, wherein the insulating layer includes at least one of silicon oxide and silicon nitride. The insulating layer has a thickness that causes charge transfer due to a tunnel effect from the first layer to the second layer when a voltage is applied between the cathode and the anode. The organic EL display device according to claim 1. The organic EL display device according to claim 1, wherein the first layer is a layer that is positioned on the cathode side with respect to the second layer and supplies electrons to the second layer. . The organic EL display according to claim 1, wherein the first layer is a layer that is located on the anode side with respect to the second layer and supplies holes to the second layer. apparatus. 10. The organic EL according to claim 9, wherein when a voltage is applied between the cathode and the anode, charges move from the first layer to the second layer by avalanche breakdown. Display device. The organic EL display device according to claim 1, wherein the at least one pixel includes a region where the insulating layer is formed and a region where the insulating layer is not formed. The organic EL display device according to claim 11, wherein the at least one pixel includes a plurality of regions in which the insulating layer is formed and are spaced apart from each other. The organic EL display device according to claim 1, wherein the insulating layer is formed in a light emitting region of the at least one pixel.

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