Display device and photosensitive composition

Abstract

The present invention addresses the problem of providing an organic EL display that, in obtaining a desired current density, has both excellent light emission characteristics which can be driven at low voltages and high reliability of light-emitting elements.　This display device includes a substrate, a first electrode, a second electrode, a pixel division layer, and an organic layer including a light-emitting layer, wherein: the pixel division layer contains (D–DL) colorants; the optical concentration at wavelengths of visible light is 0.5–3.0 per 1 μm of film thickness of the pixel division layer; in plan view, a plurality of pixel sections are provided; and, in the pixel sections, at a position 3 nm deep from the surface of the first electrode on the side contacting the organic layer including the light-emitting layer, the detected intensity of sulfur ions (S−), the detected intensity of chlorine ions (Cl−), the detected intensity of bromine ions (Br−), and the sum of the detected intensity of chlorine ions (Cl{−) and the detected intensity of bromine ions (Br−), as measured by time-of-flight secondary ion mass spectrometry, fulfill a relationship represented by a specific general formula.

Description

Display device and photosensitive composition

[0001] The present invention relates to a display device and a photosensitive composition. The present invention relates to a display device, more particularly to an organic electroluminescence (hereinafter "organic EL") display, a quantum dot display, or a micro light-emitting diode (hereinafter "micro LED") display. In particular, the present invention relates to an organic EL display.

[0002] In recent years, technologies related to organic EL displays, quantum dot displays, and micro LED displays have been actively researched for display devices having thin displays such as smartphones, tablets, and televisions, and many products using these displays have been developed.

[0003] To improve the light-emitting characteristics of organic EL displays, highly heat-resistant photosensitive compositions are used in pixel division layers, thin-film transistor (TFT) planarization layers and TFT protective layers, as well as interlayer insulating layers and gate insulating layers in TFT array formation. For example, the pixel division layer formed on a first electrode requires the formation of openings that expose the first electrode (which serves as an anode), and is therefore formed by photolithography. Furthermore, because organic EL displays contain self-emitting elements, when external light such as sunlight is incident outdoors, the reflection of that light reduces visibility and contrast. Therefore, a polarizing film is typically formed on the light extraction side as a technique for blocking external light and reducing external light reflection. There is also a technique for improving light-blocking properties by incorporating a colorant into the photosensitive composition forming the pixel division layer.

[0004] Regarding the improvement of the light-emitting characteristics of organic EL displays, if they are driven at a low voltage, a high current flows at the desired voltage, which leads to higher brightness and power saving. Furthermore, if the reliability of the light-emitting elements is improved, the durability of the organic EL display can be improved. Therefore, in order to obtain the desired current density, it is necessary to achieve both excellent light-emitting characteristics that allow low-voltage driving and excellent reliability of the light-emitting elements.

[0005] Examples of the organic EL display include an organic EL display in which the total content of metal elements and / or halogen elements in the pixel dividing layer and / or the planarizing layer is within a specific range (see Patent Document 1). Examples of the photosensitive composition include a negative photosensitive composition containing a first resin such as polyimide and a second resin such as a cardo resin (see Patent Document 2).

[0006] International Publication No. WO 2018 / 123853 International Publication No. WO 2017 / 159876

[0007] In organic EL displays, forming a polarizing film on the light extraction side also blocks some of the light emitted from the light-emitting element. Therefore, although polarizing films are effective in suppressing external light reflection, there is a problem in that the luminance of the emitted light is reduced.

[0008] On the other hand, when a colorant is contained in the photosensitive composition forming the pixel dividing layer to suppress reflection of external light, ultraviolet light and the like are also blocked during patterning exposure. Therefore, deterioration of pattern processability and development residues due to the solubility of the colorant become factors that lead to high-voltage driving in the light-emitting characteristics of organic EL displays. In addition, there is also the problem that foreign matter due to development residues and the like reduces the reliability of the light-emitting element.

[0009] Therefore, organic EL displays, which are display devices, are required to have excellent light-emitting properties that allow low-voltage operation to obtain a desired current density, as well as high reliability of the light-emitting elements. However, the display device described in Patent Document 1 above was insufficient in either of the above properties. Furthermore, photosensitive compositions are required to have excellent light-emitting properties that allow low-voltage operation to obtain a desired current density, as well as be capable of providing a cured film that provides high reliability of the light-emitting elements. However, the photosensitive composition described in Patent Document 2 above was insufficient in either of the above properties.

[0010] In order to solve the above-mentioned problems, the display device and the photosensitive composition of the present invention have the following configurations [1] to

[20] .

[0011] [1] A display device having a substrate, a first electrode, a second electrode, a pixel division layer, and an organic layer including a light-emitting layer, wherein the pixel division layer contains a (D-DL) colorant, and the optical density of the pixel division layer at a wavelength of visible light per 1 μm of film thickness is 0.5 to 3.0, the display device has a plurality of pixel units in a planar view, and a sulfur ion (S) concentration measured by time-of-flight secondary ion mass spectrometry at a position 3 nm deep from the surface of the first electrode on the side of the pixel unit that contacts the organic layer including the light-emitting layer is － ) detection strength (S Ｄｅｐ／Ａｎｏｄｅ ) counts, and chlorine ions (Cl － ) is the detected intensity (Cl Ｄｅｐ／Ａｎｏｄｅ ) counts, and bromine ions (Br － ) is the detection intensity (Br Ｄｅｐ／Ａｎｏｄｅ ) counts, and the (Cl Ｄｅｐ／Ａｎｏｄｅ ) and the (Br Ｄｅｐ／Ａｎｏｄｅ ) is the sum of (X Ｄｅｐ／Ａｎｏｄｅ ) satisfies the relationship represented by general formula (SA-1) and / or the relationship represented by general formula (XA-1). Ｄｅｐ／Ａｎｏｄｅ )≦200 (SA-1) 2≦(X Ｄｅｐ／Ａｎｏｄｅ )≦200 (XA-1) [2] The display device according to [1] above, which satisfies the relationship represented by the general formula (SA-1) and the general formula (XA-1).

[0012] [3] The display device according to [1] or [2], wherein the first electrode is a non-transparent electrode having a multi-layer structure, the first electrode has a non-transparent conductive metal layer, and at least one of the layers other than the outermost layer on the light-emitting layer side of the first electrode has a non-transparent conductive metal layer containing silver or copper as a main element.

[0013] [4] The display device according to [3], wherein the first electrode has a transparent conductive oxide film layer and a non-transparent conductive metal layer, and the outermost layer of the first electrode on the light-emitting layer side has a transparent conductive oxide film layer containing indium as a main element.

[0014] [5] In the pixel portion, at a position 3 nm deep from the surface of the transparent conductive oxide film layer on the side in contact with the organic layer including the light-emitting layer, the concentration of indium oxide ions (InO) is measured by time-of-flight secondary ion mass spectrometry. ２ － ) is the detected intensity (InO Ｄｅｐ／Ａｎｏｄｅ The display device according to the above [4], wherein, when 0.0001≦(S ) counts, the relationship represented by the general formula (SA-1) is satisfied, and further the relationships represented by the general formulas (SA-2) and (InSA-1) are satisfied, and / or the relationship represented by the general formula (XA-1) is satisfied, and further the relationships represented by the general formulas (XA-2) and (InXA-1) are satisfied. Ｄｅｐ／Ａｎｏｄｅ ) / (InO Ｄｅｐ／Ａｎｏｄｅ )≦0.1 (SA-2) 1,000≦(InO Ｄｅｐ／Ａｎｏｄｅ )≦40,000 (InSA-1) 0.0001≦(X Ｄｅｐ／Ａｎｏｄｅ ) / (InO Ｄｅｐ／Ａｎｏｄｅ )≦0.1 (XA-2) 1,000≦(InO Ｄｅｐ／Ａｎｏｄｅ )≦40,000 (InXA-1) [6] The display device according to any one of the above [1] to [5], further satisfying the relationship represented by general formula (SA-1a) and / or the relationship represented by general formula (XA-1a). Ｄｅｐ／Ａｎｏｄｅ )≦100 (SA-1a) 2≦(X Ｄｅｐ／Ａｎｏｄｅ )≦100 (XA-1a) [7] In a region of the pixel dividing layer portion that does not overlap with a region where an organic layer portion including a light-emitting layer is formed, on a surface of the pixel dividing layer portion on a side that contacts the second electrode portion or a side that is exposed at an opening of the second electrode portion, the ratio of sulfur ions (S － The ratio of the detected intensities of (S ＰＤＬ ) and chlorine ions (Cl － The ratio of the detected intensities of (Cl) ＰＤＬ ) and bromine ions (Br － The ratio of the detected intensities of (Br ＰＤＬ ) and the (Cl ＰＤＬ ) and the (Br ＰＤＬ ) is the sum of (X ＰＤＬ) in the pixel section, on the surface of the first electrode section on the side in contact with the organic layer section including the light-emitting layer, the proportion of sulfur ions (S － ) is the ratio of the detected intensities (S Ａｎｏｄｅ ) and chlorine ions (Cl － The ratio of the detected intensities of (Cl) Ａｎｏｄｅ ) and bromine ions (Br － The ratio of the detected intensities of (Br Ａｎｏｄｅ ) and the (Cl Ａｎｏｄｅ ) and the (Br Ａｎｏｄｅ ) is the sum of (X Ａｎｏｄｅ ) the display device according to any one of [1] to [6] above, wherein when 0.1≦(S Ａｎｏｄｅ ) / (S ＰＤＬ )≦20 (SD-1) 0.1≦(X Ａｎｏｄｅ ) / (X ＰＤＬ )≦20 (XD−1) [8] The display device according to any one of [1] to [7], wherein the pixel dividing layer contains an organic black pigment and / or a mixture of two or more colored pigments, the organic black pigment contains one or more pigments selected from the group consisting of benzofuranone-based black pigments, perylene-based black pigments, and azo-based black pigments, and the mixture of two or more colored pigments contains two or more pigments selected from the group consisting of red, orange, yellow, green, blue, and purple.

[0015] [9] The display device according to any one of the above [1] to [8], wherein the pixel dividing layer contains the following (A1-DL) resin and / or (A3-DL) resin: (A1-DL) resin: resin having a structural unit including one or more selected from the group consisting of an imide structure, an amide structure, an oxazole structure, and a siloxane structure (A3-DL) resin: resin having a structural unit including a phenolic hydroxyl group

[10] The display device according to any one of the above [1] to [9], wherein the pixel dividing layer contains the following (C1x-DL) compound and / or (C2x-DL) compound. (C1x-DL) compound: a compound having a fluorene structure, a benzofluorene structure, a dibenzofluorene structure, a carbazole structure, a benzocarbazole structure, an indole structure, a benzoindole structure, or a diphenyl sulfide structure, and having a structure in which an imino group is bonded to these structures and / or a structure in which a carbonyl group is bonded to these structures. (C2x-DL) compound: a compound having a carboxylic acid ester structure containing an indene structure and / or a sulfonic acid aryl ester structure containing an indene structure.

[11] The display device according to any one of [1] to

[10] above, wherein the non-transparent conductive metal layer in the first electrode containing silver or copper as a main component element further contains, as an element other than the main component element, one or more elements selected from the group consisting of In, Sn, Zn, Al, Ga, Bi, Nd, Ni, Mn, Na, K, Mg, Ca, C, and Si.

[0016]

[12] The display device according to any one of [1] to

[11] above, further comprising a flexible substrate, having a structure in which the pixel division layer is laminated on the flexible substrate, and not comprising a linear polarizer, a quarter-wave plate, or a circular polarizer on the light extraction side of the organic layer including the light-emitting layer, and having a curved display section, a display section including an outwardly bent surface, or a display section including an inwardly bent surface, and having flexibility.

[0017]

[13] The pixel division layer includes a cured pattern having a step shape, and the thickness of a thick film portion in the step shape of the cured pattern of the pixel division layer is (T ＦＴ ) μm, and the film thickness of the thin film portion is (T ＨＴ ) μm, the (T ＦＴ) μm and the (T ＨＴ ) μm and the film thickness difference (ΔT ＦＴ－ＨＴ 13. The display device according to any one of [1] to

[12] above, wherein the thickness is 0.5 to 10.0 μm.

[0018]

[14] The display device according to

[13] , wherein the thick and thin film portions in the stepped shape of the cured pattern of the pixel division layer contain the same (D-DL) colorant, and the optical density of the thick and thin film portions per μm of film thickness at the wavelength of visible light is 0.5 to 3.0.

[0019]

[15] The pixel division layer has a cured pattern, and a spacer layer is provided on a part of the pixel division layer, and the thickness of the spacer layer (T ＳＰ) μm is 0.5 to 10.0 μm, and the spacer layer satisfies at least one of the following conditions (1) to (3): (1) The spacer layer does not contain a (D-DL) colorant. (2) The spacer layer contains a (D-DL) colorant, and the optical density of the spacer layer at the wavelength of visible light per 1 μm of film thickness is 0.0 to 0.3. (3) The spacer layer contains a compound having a carboxylic acid ester structure containing a (C2x-DL) indene structure and / or a sulfonic acid aryl ester structure containing an indene structure.

[16] A display device having an organic layer including a substrate, a first electrode, a second electrode, a pixel dividing layer, and a light-emitting layer, wherein the pixel dividing layer contains a (D-DL) colorant, and the optical density of the pixel dividing layer at the wavelength of visible light per 1 μm of film thickness is 0.5 to 3.0, and the pixel dividing layer contains one or more compounds selected from the group consisting of the following (I1a-DL) compound, (I1b-DL) compound, (I2a-DL) compound, and (I2b-DL) compound, A display device, wherein the (I1a-DL) compound and the (I2a-DL) compound have the following structure (I-Ia), and the (I1b-DL) compound and the (I2b-DL) compound have the following structure (I-Ib), and the display device satisfies one or more of the following conditions (1a-DL) and (1b-DL), or one or more of the following conditions (2a-DL) and (2b-DL):(I1a-DL) compound: one or more compounds selected from the group consisting of thiol structure-containing compounds, sulfide structure-containing compounds, disulfide structure-containing compounds, sulfoxide structure-containing compounds, sulfone structure-containing compounds, sultone structure-containing compounds, thiophene structure-containing compounds, and sulfonic acid structure-containing compounds. (I1b-DL) compound: a compound having, as an anion species, one or more selected from the group consisting of a sulfide ion structure, a hydrogen sulfide ion structure, a sulfate ion structure, and a hydrogen sulfate ion structure, and having, as a cation species, an ammonium ion structure, a primary ammonium ion structure, a secondary ammonium ion structure, a tertiary ammonium ion structure, or a quaternary ammonium ion structure. (I2a-DL) compound: one or more compounds selected from the group consisting of alkyl chloride structure-containing compounds, cycloalkyl chloride structure-containing compounds, aryl chloride structure-containing compounds, alkyl bromide structure-containing compounds, cycloalkyl bromide structure-containing compounds, and aryl bromide structure-containing compounds. (I2b-DL) Compound: A compound having a chloride ion structure and / or a bromide ion structure as an anion species, and an ammonium ion structure, a primary ammonium ion structure, a secondary ammonium ion structure, a tertiary ammonium ion structure, or a quaternary ammonium ion structure as a cation species. (I-Ia) Structure: A structure containing one or more groups selected from the group consisting of a mono- to divalent aliphatic group having 4 to 30 carbon atoms, an alkylaryl group having 10 to 30 carbon atoms, an arylalkyl group having 10 to 30 carbon atoms, and an aryl group having 7 to 15 carbon atoms. (I-Ib) Structure: A structure containing one or more groups selected from the group consisting of a mono- to divalent aliphatic group having 1 to 6 carbon atoms, an alkylaryl group having 10 to 30 carbon atoms, an arylalkyl group having 10 to 30 carbon atoms, and an aryl group having 7 to 15 carbon atoms. (1a-DL) The content of sulfur element in the pixel dividing layer is 0.01 to 500 mass ppm. (1b-DL) The total content of sulfide ions, hydrogen sulfide ions, sulfate ions, and hydrogen sulfate ions in the pixel dividing layer is 0.01 to 1,000 ppm by mass. (2a-DL) The total content of chlorine and bromine elements in the pixel dividing layer is 0.01 to 500 ppm by mass. (2b-DL) The total content of chloride ions and bromide ions in the pixel dividing layer is 0.01 to 1,000 ppm by mass.

[0020]

[17] A photosensitive composition containing (A) an alkali-soluble resin, (C) a photosensitizer, and (D) a colorant, the photosensitive composition satisfying the following condition (I) and / or condition (II): (I) The photosensitive composition further contains one or more components selected from the group consisting of a component containing elemental sulfur, a component containing elemental chlorine, and a component containing elemental bromine, and satisfies the following conditions (1a) and / or (2a): (1a) the content of elemental sulfur in the photosensitive composition is 0.01 to 100 ppm by mass; (2a) the total content of elemental chlorine and elemental bromine in the photosensitive composition is 0.01 to 100 ppm by mass; (II) The photosensitive composition further contains one or more components selected from the group consisting of the following components containing sulfur-based anions and the following components containing halogen anions, and satisfies the following conditions (1b) and / or (2b): sulfur-based anion: one or more ions selected from the group consisting of sulfide ion, hydrogen sulfide ion, sulfate ion, and hydrogen sulfate ion; halogen anion: chloride ion and / or bromide ion (1b) The photosensitive composition contains sulfide ions, hydrogen sulfide ions, sulfate ions, and hydrogen sulfate ions in a total content of 0.01 to 500 ppm by mass. (2b) The photosensitive composition contains chloride ions and bromide ions in a total content of 0.01 to 500 ppm by mass.

[18] The photosensitive composition according to item

[17] , which contains a component containing elemental sulfur and satisfies the condition (1a) above, and / or contains a component containing a sulfur-based anion and satisfies the condition (1b) above.

[0021]

[19] The photosensitive composition according to

[17] or

[18] , which contains the component containing sulfur element and satisfies the condition (1a) above, and / or contains the component containing sulfur-based anion and satisfies the condition (1b) above, and contains one or more components selected from the group consisting of the component containing chlorine element and the component containing bromine element and satisfies the condition (2a) above, and / or contains the component containing halogen anion and satisfies the condition (2b) above.

[0022]

[20] The photosensitive composition according to any one of

[17] to

[19] above, further containing water and satisfying the following condition (3): (3) The content of water in the photosensitive composition is 0.01 to 2.0 mass %.

[0023] To provide an organic EL display that has excellent light-emitting characteristics that allow low-voltage driving to obtain a desired current density, and also has highly reliable light-emitting elements.

[0024] 1 is a schematic cross-sectional view and a plan view showing an example of a display device including a pixel division layer having a stepped shape. 2 is a schematic cross-sectional view and a plan view showing an example of a display device including a pixel division layer and a spacer layer. 3 is a schematic cross-sectional view and a plan view showing an example of a display device including a pixel division layer having a stepped shape and a pixel dimension control layer. 4 is a plan view showing an example of the shape of a pixel portion, the shape of a color filter layer portion, and the shape of an opening in a black matrix layer portion. 5 is a schematic cross-sectional view and a plan view showing an example of a display device having a configuration in which the black matrix layer portion overlaps the color filter layer portion. 6 is a schematic cross-sectional view showing an example of a display device including a pixel division layer having a stepped shape and a polarizing film. 7 is a plan view showing an example of a display device having a configuration in which first color pixel portions, second color pixel portions, and third color pixel portions are included. 8 is a schematic cross-sectional view showing an example of a cross section of a cured pattern having a stepped shape. 9 is a schematic cross-sectional view showing an example of a manufacturing process of steps 1 to 6 for a display device including a pixel division layer having a stepped shape. 10 is a plan view showing a manufacturing process of steps 1 to 4 for a substrate of an organic EL display used for evaluating light-emitting characteristics. 1 is a plan view showing an example of the arrangement and dimensions of a light-transmitting portion, a light-shielding portion, and a semi-light-transmitting portion in a half-tone photomask used in an evaluation of half-tone characteristics, and a plan view showing an example of the arrangement and dimensions of a thick film portion, an opening portion, and a thin film portion in an organic EL display used in an evaluation of light-emitting characteristics.

[0025] Hereinafter, display devices according to the first and second aspects of the present invention will be described. The term "display device of the present invention" refers to the display devices according to the first and second aspects of the present invention, as well as a display device comprising a cured product obtained by curing a photosensitive composition according to the third aspect of the present invention, which will be described later. On the other hand, when describing a display device according to a specific aspect, it will be referred to as the display device according to the first aspect, etc.

[0026] In the display device of the present invention, a plane in a planar view refers to a plane parallel to the substrate, which will be described later. Furthermore, in the display device of the present invention, a planar view refers to a plane parallel to the substrate, as defined by the x-y axis, and a direction perpendicular to the x-y axis, as defined by the z axis. The planar view refers to a planar view of the light extraction side of the display device, within the x-y axis as viewed from the z axis. When focusing on a specific component in a planar view, the view is taken through another component overlapping the specific component. If the substrate is not flat, the x-y plane refers to a plane parallel to an arbitrary pixel portion, as will be described later. In the display device of the present invention, "overlapping" refers to direct or indirect overlapping in the z axis direction. In the display device of the present invention, the average value of the pattern dimensions can be calculated as the average value obtained by measuring the pattern dimensions at 30 points using an optical microscope or a scanning electron microscope (hereinafter referred to as "SEM"). Similarly, the maximum and minimum values ​​of the pattern dimensions can be calculated as the maximum and minimum values ​​obtained by measuring the pattern dimensions at 30 points using an optical microscope or a SEM. The main chain of a resin refers to the longest chain among the chains constituting the resin, including structural units. The side chain of a resin refers to a chain that branches off from or is bonded to the main chain and is shorter than the main chain, among the chains that make up the resin and contain structural units. The end of a resin refers to a structure that seals the main chain, such as a structure derived from an end-capping agent. Furthermore, a hydrocarbon group or alkylene group that includes a "** bond" or "** group" refers to a hydrocarbon group or alkylene group that is bonded to a "** bond" or "** group," or at least two hydrocarbon groups or at least two alkylene groups that are linked by a "** bond" or "** group."

[0027] <Display Device> A display device according to a first aspect of the present invention is a display device having an organic layer including a substrate, a first electrode, a second electrode, a pixel division layer, and a light-emitting layer, wherein the pixel division layer contains a (D-DL) colorant, and the pixel division layer has an optical density of 0.5 to 3.0 at a wavelength of visible light per 1 μm of film thickness, the display device has a plurality of pixel units in a planar view, and a sulfur ion (S) content measured by time-of-flight secondary ion mass spectrometry at a position 3 nm deep from the surface of the first electrode on the side of the pixel unit that contacts the organic layer including the light-emitting layer. － ) detection strength (S Ｄｅｐ／Ａｎｏｄｅ ) counts, and chlorine ions (Cl － ) is the detected intensity (Cl Ｄｅｐ／Ａｎｏｄｅ ) counts, and bromine ions (Br － ) is the detection intensity (Br Ｄｅｐ／Ａｎｏｄｅ ) counts, and the (Cl Ｄｅｐ／Ａｎｏｄｅ ) and the (Br Ｄｅｐ／Ａｎｏｄｅ ) is the sum of (X Ｄｅｐ／Ａｎｏｄｅ ), the display device satisfies the relationship represented by the general formula (SA-1) and / or the relationship represented by the general formula (XA-1). Ｄｅｐ／Ａｎｏｄｅ )≦200 (SA-1) 2≦(X Ｄｅｐ／Ａｎｏｄｅ )≦200 (XA-1).

[0028] With this configuration, the display device of the present invention can achieve both excellent light-emitting characteristics that allow low-voltage operation and high reliability of the light-emitting element. In the pixel section, the higher the detection intensity of sulfur ions, chloride ions, and bromine ions on the surface of the first electrode that contacts the organic layer including the light-emitting layer, the greater the proportion of the first electrode surface modified by these elements. By configuring the detection intensities of sulfur ions, chloride ions, and bromine ions as described above, excellent light-emitting characteristics that allow low-voltage operation are achieved by adjusting the work function difference. In addition, it is believed that high light-emitting brightness is achieved when driven at the same voltage. Furthermore, intentionally adjusting the detection intensity of these ions on the first electrode is believed to control the polarization structure and charge balance on the first electrode in, for example, an organic EL display. This is believed to suppress ion migration and electromigration caused by metal impurities and ionic impurities that adversely affect light-emitting characteristics, thereby achieving high reliability of the light-emitting element. Furthermore, it is believed that suppressing metal migration and aggregation in the first electrode contributes to high reliability of the light-emitting element. Furthermore, the effect of high reliability of the light emitting element is achieved.

[0029] A display device according to a second aspect of the present invention is a display device having an organic layer including a substrate, a first electrode, a second electrode, a pixel dividing layer, and a light-emitting layer, wherein the pixel dividing layer contains a (D-DL) colorant, and the pixel dividing layer has an optical density of 0.5 to 3.0 at a wavelength of visible light per 1 μm of film thickness, and the pixel dividing layer contains one or more compounds selected from the group consisting of a (I1a-DL) compound, a (I1b-DL) compound, a (I2a-DL) compound, and a (I2b-DL) compound shown below, wherein the (I1a-DL) compound and the (I2a-DL) compound have the following (I-Ia) structure, and the (I1b-DL) compound and the (I2b-DL) compound have the following (I-Ib) structure.(I1a-DL) compound: one or more compounds selected from the group consisting of thiol structure-containing compounds, sulfide structure-containing compounds, disulfide structure-containing compounds, sulfoxide structure-containing compounds, sulfone structure-containing compounds, sultone structure-containing compounds, thiophene structure-containing compounds, and sulfonic acid structure-containing compounds. (I1b-DL) compound: a compound having, as an anion species, one or more selected from the group consisting of a sulfide ion structure, a hydrogen sulfide ion structure, a sulfate ion structure, and a hydrogen sulfate ion structure, and having, as a cation species, an ammonium ion structure, a primary ammonium ion structure, a secondary ammonium ion structure, a tertiary ammonium ion structure, or a quaternary ammonium ion structure. (I2a-DL) compound: one or more compounds selected from the group consisting of alkyl chloride structure-containing compounds, cycloalkyl chloride structure-containing compounds, aryl chloride structure-containing compounds, alkyl bromide structure-containing compounds, cycloalkyl bromide structure-containing compounds, and aryl bromide structure-containing compounds. (I2b-DL) Compound: A compound having a chloride ion structure and / or a bromide ion structure as an anion species, and an ammonium ion structure, a primary ammonium ion structure, a secondary ammonium ion structure, a tertiary ammonium ion structure, or a quaternary ammonium ion structure as a cation species. (I-Ia) Structure: A structure containing one or more groups selected from the group consisting of a mono- to divalent aliphatic group having 4 to 30 carbon atoms, an alkylaryl group having 10 to 30 carbon atoms, an arylalkyl group having 10 to 30 carbon atoms, and an aryl group having 7 to 15 carbon atoms. (I-Ib) Structure: A structure containing one or more groups selected from the group consisting of a mono- to divalent aliphatic group having 1 to 6 carbon atoms, an alkylaryl group having 10 to 30 carbon atoms, an arylalkyl group having 10 to 30 carbon atoms, and an aryl group having 7 to 15 carbon atoms. (1a-DL) The content of sulfur element in the pixel dividing layer is 0.01 to 500 mass ppm. (1b-DL) The total content of sulfide ions, hydrogen sulfide ions, sulfate ions, and hydrogen sulfate ions in the pixel dividing layer is 0.01 to 1,000 ppm by mass. (2a-DL) The total content of chlorine and bromine elements in the pixel dividing layer is 0.01 to 500 ppm by mass. (2b-DL) The total content of chloride ions and bromide ions in the pixel dividing layer is 0.01 to 1,000 ppm by mass.

[0030] With this configuration, the display device of the present invention can achieve both excellent light-emitting characteristics that allow low-voltage operation and high reliability of the light-emitting element. By incorporating a compound having a structure containing a sulfur element, a compound having a structure containing the above-mentioned sulfur-based anion, a compound having a structure containing a chlorine element, a compound having a structure containing a bromine element, or a compound having a structure containing the above-mentioned halogen anion in the pixel division layer, it is believed that when the pixel division layer is formed on the first electrode described below, the surface of the first electrode on the light-emitting layer side corresponding to the openings in the pixel division layer section or the pixel dimension control layer section is surface-modified by these elements or ions. Furthermore, after the pixel division layer is formed, it is believed that the transition of these elements or ions contained in the pixel division layer results in the surface modification of the first electrode by these elements or ions. As a result, it is believed that excellent light-emitting characteristics that allow low-voltage operation are achieved by adjusting the work function difference. In addition, it is believed that high light-emitting brightness is achieved when driven at the same voltage. Furthermore, it is believed that intentionally incorporating these compounds can control the polarization structure and charge balance in the pixel division layer in, for example, an organic EL display. This is believed to contribute to the high reliability of the light-emitting device by suppressing ion migration and electromigration caused by metal impurities and ion impurities that adversely affect the light-emitting characteristics. Also, it is believed that the suppression of migration and aggregation of metals in the first electrode contributes to the high reliability of the light-emitting device.

[0031] <Substrate> The display device of the present invention has a substrate. From the viewpoint of improving impact resistance, the substrate preferably contains silicon dioxide or dialuminum trioxide, and more preferably is a glass substrate, a quartz substrate, a crystal substrate, or a sapphire substrate.

[0032] The substrate is preferably a flexible substrate from the viewpoints of improving flexibility, bendability, and improving the shape freedom of the display device (such as curved or bent shapes). The flexible substrate is preferably a substrate containing carbon as a main component element from the viewpoints of improving adhesion between the cured film of the present invention and the substrate and improving bendability. The main component element in a flexible substrate refers to the element that is most abundant among the constituent elements of the flexible substrate. The flexible substrate is preferably a polyimide substrate, a polyethylene terephthalate substrate, a cycloolefin polymer substrate, a polycarbonate substrate, or a cellulose triacetate substrate, and a polyimide substrate is more preferred from the viewpoint of improving bendability. The display device of the present invention preferably has a structure in which a pixel dividing layer described below is laminated on a flexible substrate.

[0033] The display device of the present invention is preferably a flexible display device, and preferably has a curved display portion, a display portion including an outwardly bent surface, or a display portion including an inwardly bent surface. The flexible display device is preferably a flexible organic EL display, a flexible quantum dot display, or a flexible micro LED display, and more preferably a flexible organic EL display.

[0034] <First Electrode and Second Electrode; First Electrode Portion and Second Electrode Portion in Plan View> The display device of the present invention has a first electrode and a second electrode. By combining a transparent electrode and a non-transparent electrode as the first electrode and the second electrode, light emitted from an organic layer including a light-emitting layer (described later) can be extracted to one side. The transparent electrode and the non-transparent electrode are required to have excellent electrical properties. When a transparent electrode or a non-transparent electrode is used as an anode, it is required to have composite properties such as being able to efficiently inject holes, and when used as a cathode, it is required to be able to efficiently inject electrons.

[0035] A display device with a bottom-emission configuration has a transparent electrode as the first electrode and a non-transparent electrode as the second electrode. On the other hand, a display device with a top-emission configuration has a non-transparent electrode as the first electrode and a transparent electrode as the second electrode. A display device with a bottom-emission configuration is preferably an organic EL display with a bottom-emission configuration. A display device with a top-emission configuration is preferably an organic EL display with a top-emission configuration. A transparent electrode refers to an electrode having a transmittance of 30% or more at a wavelength of 550 nm. A non-transparent electrode refers to an electrode having a transmittance of less than 30% at a wavelength of 550 nm. When an electrode has a multilayer structure, the transmittance is measured at a wavelength of 550 nm for the multilayer structure, and the electrode is classified as a transparent electrode or a non-transparent electrode. In order to achieve multiple properties, it is also preferable that the first electrode of the non-transparent electrode has a multilayer structure. For example, the first electrode of the non-transparent electrode may have a multilayer structure, and a base layer that improves adhesion and corrosion resistance, or a reflection adjustment layer that adjusts reflectance, may be provided on the substrate side of the first electrode. When the electrode has a single-layer structure, the terms "transparent" or "non-transparent" in the transparent conductive oxide film layer, non-transparent conductive layer, non-transparent conductive metal layer, transparent conductive layer, and transparent conductive metal layer described below refer to a transmittance of 30% or more or less than 30% at a wavelength of 550 nm, as described above. On the other hand, when the electrode has a multilayer structure, a transmittance of 30% or more overall at a wavelength of 550 nm is considered transparent, and a transmittance of less than 30% for any one layer constituting the multilayer structure is considered non-transparent. In other words, when a multilayer structure has at least one non-transparent conductive layer or non-transparent conductive metal layer, the electrode having the multilayer structure is considered a non-transparent electrode. When a multilayer electrode is classified as transparent, it is preferable that each layer constituting the multilayer structure has a transmittance of 70% or more at a wavelength of 550 nm.

[0036] The display device of the present invention preferably has a plurality of first electrode units in a planar view. The first electrode unit corresponds to the first electrode unit when viewed in a planar view. The display device of the present invention preferably has a second electrode unit in a planar view. The second electrode unit corresponds to the second electrode unit when viewed in a planar view. The display device of the present invention more preferably has a plurality of second electrode units. The shape of the first electrode units when the display device of the present invention has a plurality of first electrode units, and the shape of the second electrode units when the display device of the present invention has a plurality of second electrode units, are preferably a closed polygon, a shape of a closed polygon in which at least some of the sides and / or vertices are replaced with arcs, or a closed shape formed by arcs. Examples and preferred descriptions of the closed polygon, the shape of a closed polygon in which at least some of the sides and / or vertices are replaced with arcs, and the closed shape formed by arcs are as described below.

[0037] <Transparent Conductive Oxide Film Layer, Non-Transparent Conductive Layer, Non-Transparent Conductive Metal Layer, Transparent Conductive Layer, and Transparent Conductive Metal Layer> The display device of the present invention preferably has a transparent conductive oxide film layer as the outermost layer on the light-emitting layer side of the first electrode, more preferably a transparent conductive oxide film layer containing In, Sn, Zn, Al, or Ga as a main element, and even more preferably a transparent conductive oxide film layer containing indium as a main element. The main element in the transparent conductive oxide film layer refers to the element other than oxygen that is most abundant among the constituent elements of the transparent conductive oxide film layer. The transparent conductive oxide film layer containing In, Sn, Zn, Al, or Ga as a main element is preferably ITO or IZO, more preferably ITO, from the viewpoints of low-voltage driving of light-emitting characteristics and improving the reliability of the light-emitting device. The transparent conductive oxide film layer is preferably an amorphous transparent conductive oxide film layer, more preferably an amorphous transparent conductive oxide film layer containing indium as a main element, from the viewpoints of low-voltage driving of light-emitting characteristics and improving the reliability of the light-emitting device. On the other hand, from the viewpoint of improving luminance, the transparent conductive oxide film layer is preferably a polycrystalline transparent conductive oxide film layer, and more preferably a polycrystalline transparent conductive oxide film layer containing indium as a main element. In addition, in the display device of the present invention, whether the first electrode has a multilayer structure and is a transparent electrode or a non-transparent electrode, it is preferable that the transparent conductive oxide film layer is present on the outermost layer of the first electrode on the luminescent layer side. The first electrode has a single-layer structure or a multilayer structure. When the first electrode has a single-layer structure, the first electrode is preferably a transparent electrode. When the first electrode has a multilayer structure, the first electrode is preferably a transparent electrode or a non-transparent electrode. When the first electrode is used as an anode, the first electrode is preferably ITO or IZO, more preferably ITO, from the viewpoint of achieving low-voltage driving of luminescent characteristics and improving luminance. When the first electrode is a transparent electrode, it is preferable to adjust the transmittance at a wavelength of 550 nm by adjusting the film thickness of the first electrode.

[0038] When the first electrode is a non-transparent electrode having a single layer structure, the first electrode is a non-transparent conductive layer. When the first electrode is a non-transparent electrode having a multilayer structure, the first electrode has a non-transparent conductive layer. It is preferable that at least one of the layers of the first electrode other than the outermost layer on the light-emitting layer side is a non-transparent conductive layer. Whether the first electrode is a non-transparent electrode and has a single layer structure or a multilayer structure, the non-transparent conductive layer is preferably a non-transparent conductive metal layer containing a metal element. Furthermore, when the first electrode is used as an anode, from the viewpoints of low-voltage driving of light-emitting characteristics, improved light-emitting brightness, improved reliability of the light-emitting device, and improved corrosion resistance, the non-transparent conductive metal layer preferably contains Ag, Cu, Au, Ti, Al, Ni, Mo, or Cr as a main component element, more preferably Ag, Cu, Au, Ti, or Al as a main component element, and even more preferably silver or copper as a main component element. The non-transparent conductive metal layer preferably further contains, as an element other than the main component, one or more elements selected from the group consisting of In, Sn, Zn, Al, Ga, Pd, Cu, Bi, Nd, Ni, Mn, Na, K, Mg, Ca, C, and Si, and more preferably contains one or more elements selected from the group consisting of In, Sn, Al, Pd, Cu, Na, K, Mg, Ca, and Si. The main component element in the non-transparent conductive metal layer refers to the element that is most abundant among the constituent elements of the non-transparent conductive metal layer. When the first electrode is a non-transparent electrode, it is preferable to adjust the film thickness of the first electrode to adjust the transmittance at a wavelength of 550 nm.

[0039] The display device of the present invention preferably has a transparent conductive metal layer as the outermost layer on the light-emitting layer side of the second electrode, more preferably a transparent conductive metal layer containing Li, Mg, Ag, Cu, Au, Ti, or Al as a main component element, and even more preferably a transparent conductive metal layer containing magnesium or silver as a main component element. The main component element in the transparent conductive metal layer refers to the element that is most abundant among the constituent elements of the transparent conductive metal layer. From the viewpoint of improving luminance, the transparent conductive metal layer containing Li, Mg, Ag, Cu, Au, Ti, or Al as a main component element is preferably LiAg or MgAg, and more preferably MgAg. Note that the display device of the present invention preferably has these transparent conductive metal layers as the outermost layer on the light-emitting layer side of the second electrode, whether the second electrode has a multilayer structure and is a transparent electrode or a non-transparent electrode. When the second electrode is used as a cathode, the transparent conductive metal layer or non-transparent conductive metal layer preferably contains Li, Mg, Ag, Cu, Au, Ti, or Al as a main component element, from the viewpoint of improving the luminance of light emitted and the reliability of the light-emitting device. The transparent conductive metal layer is preferably LiAg or MgAg, more preferably MgAg, from the viewpoint of improving the luminance of light emitted. When the second electrode is a transparent electrode or a non-transparent electrode, it is preferable to adjust the transmittance at a wavelength of 550 nm by adjusting the film thickness of the second electrode.

[0040] <Amorphous transparent conductive oxide film layer; non-transparent conductive metal layer containing specific metal> In the display device of the present invention, from the viewpoint of achieving low-voltage operation of light-emitting characteristics and improving light emission brightness, it is preferable that the first electrode is a non-transparent electrode having a multilayer structure, the first electrode has a non-transparent conductive metal layer, and at least one of the layers of the first electrode other than the outermost layer on the light-emitting layer side has a non-transparent conductive metal layer containing silver or copper as a main component element. By having a non-transparent conductive metal layer containing silver or copper as a main component element, the effects of low-voltage operation of light-emitting characteristics and improving light emission brightness are significant because silver or copper has excellent low resistance characteristics.

[0041] When the display device of the present invention has such a configuration, from the viewpoint of achieving low-voltage driving of light-emitting characteristics and improving the reliability of the light-emitting element, it is preferable that the first electrode has a transparent conductive oxide film layer and a non-transparent conductive metal layer, and that the outermost layer of the first electrode on the light-emitting layer side has a transparent conductive oxide film layer containing indium as a main component element. It is presumed that by having a transparent conductive oxide film layer containing indium as a main component element on the outermost layer of the first electrode on the light-emitting layer side, the work function difference can be adjusted, thereby significantly improving the effects of low-voltage driving of light-emitting characteristics and improving the reliability of the light-emitting element.

[0042] From the viewpoints of achieving low-voltage operation of light-emitting characteristics, improved light-emitting brightness, and improved reliability of light-emitting elements, the display device of the present invention preferably has a multilayered non-transparent electrode, the first electrode including a transparent conductive oxide film layer and a non-transparent conductive metal layer, the outermost layer of the first electrode facing the light-emitting layer including an amorphous transparent conductive oxide film layer containing indium as a primary component, and at least one of the layers of the first electrode facing the light-emitting layer other than the outermost layer including a non-transparent conductive metal layer containing silver or copper as a primary component, thereby achieving a top-emission configuration. As described above, the silver or copper contained in the non-transparent conductive metal layer has excellent low-resistance characteristics, resulting in significant effects of low-voltage operation of light-emitting characteristics and improved light-emitting brightness. Furthermore, it is estimated that the adjustment of the work function difference by the indium contained in the transparent conductive oxide film layer significantly contributes to the significant effects of low-voltage operation of light-emitting characteristics and improved reliability of the light-emitting elements. Furthermore, the amorphous transparent conductive oxide film layer suppresses the occurrence of defects, and the top-emission configuration reduces stray light and scattered light within the element, preventing the need for high driving voltages to ensure luminance. This is expected to have a significant effect on improving the reliability of the light-emitting element.

[0043] It is presumed that the amorphous transparent conductive oxide film layer on the outermost surface of the first electrode suppresses the occurrence of defects and protrusions on the surface of the first electrode, thereby significantly improving the reliability of the light-emitting device. In addition, the amorphous conductive oxide film layer on the outermost surface is prone to surface modification by sulfur, chlorine, and bromine elements, which is presumed to significantly improve the light-emitting characteristics by adjusting the work function difference, thereby lowering the driving voltage and improving the reliability of the light-emitting device. Furthermore, it is presumed that the non-transparent conductive metal layer containing silver or copper as a main component improves the light extraction efficiency due to the high reflectivity properties of these metals, thereby significantly improving the light-emitting characteristics, thereby significantly improving the driving voltage and improving the light-emitting brightness. Similarly, it is presumed that the low resistivity properties of these metals improve the conductivity, thereby significantly improving the light-emitting characteristics, thereby significantly improving the driving voltage and improving the light-emitting brightness. The amorphous transparent conductive oxide film layer and the non-transparent conductive metal layer containing silver or copper as a main component element significantly improve the light-emitting characteristics by lowering the driving voltage, improving the reliability of the light-emitting element, improving the light-emitting brightness, and improving the light extraction efficiency, making this particularly suitable for display devices with a top-emission configuration.

[0044] The total content of silver and copper in the non-transparent conductive metal layer containing silver or copper as a main component in the first electrode is preferably 95% by mass or more, more preferably 96% by mass or more, and even more preferably 97% by mass or more, from the viewpoints of achieving low-voltage operation and improved luminance due to high reflectivity and low resistivity, while the total content of silver and copper is preferably 99.5% by mass or less, more preferably 99% by mass or less, and even more preferably 98.5% by mass or less, from the viewpoints of achieving low-voltage operation and improved luminance due to high reflectivity and low resistivity, from the viewpoints of achieving low-voltage operation and improved luminance due to high reflectivity and low resistivity,

[0045] The non-transparent conductive metal layer in the first electrode containing silver as a main component preferably further contains copper and / or palladium, more preferably copper and palladium, as an element other than the main component. The non-transparent conductive metal layer in the first electrode containing copper as a main component preferably further contains silver and / or palladium, more preferably silver and palladium, as an element other than the main component. It is believed that the inclusion of these elements improves the conductivity of the first electrode, thereby significantly reducing the driving voltage of the light-emitting device and improving its luminance. It is also believed that the heat resistance and oxidation resistance of the first electrode are significantly improved, thereby significantly improving the reliability of the light-emitting device.

[0046] The total content of copper and palladium in the non-transparent conductive metal layer containing silver as a main component in the first electrode is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and even more preferably 1.0% by mass or more, from the viewpoints of achieving low-voltage operation of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device. On the other hand, the total content of copper and palladium is preferably 5% by mass or less, more preferably 4% by mass or less, and even more preferably 3% by mass or less, from the viewpoints of achieving low-voltage operation of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device. Furthermore, the total content of silver and palladium in the non-transparent conductive metal layer containing copper as a main component in the first electrode is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and even more preferably 1.0% by mass or more, from the viewpoints of achieving low-voltage operation of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device. On the other hand, the total content ratio of silver element and palladium element is preferably 5 mass % or less, more preferably 4 mass % or less, and even more preferably 3 mass % or less, from the viewpoints of achieving low-voltage driving of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting element.

[0047] In the display device of the present invention, when the first electrode is a non-transparent electrode having a multilayer structure, the first electrode has a transparent conductive oxide film layer and a non-transparent conductive metal layer, the outermost layer of the first electrode on the light-emitting layer side has an amorphous transparent conductive oxide film layer containing indium as a main component element, and at least one layer of the layers other than the outermost layer on the light-emitting layer side of the first electrode has a non-transparent conductive metal layer containing silver or copper as a main component element, and the display device has a top-emission configuration, In the display device of the present invention, the non-transparent conductive metal layer in the first electrode, which contains silver or copper as a primary element, preferably further contains, as an element other than the primary element, one or more elements selected from the group consisting of In, Sn, Zn, Al, Ga, Bi, Nd, Ni, Mn, Na, K, Mg, Ca, C, and Si, more preferably one or more elements selected from the group consisting of In, Sn, Al, Na, K, Mg, Ca, and Si, and even more preferably one or more elements selected from the group consisting of Na, K, Mg, and Ca. It is believed that the inclusion of these elements improves the conductivity of the first electrode, thereby significantly improving the light-emitting characteristics, enabling lower drive voltages, and improving light-emitting brightness. The non-transparent conductive metal layer in the first electrode, which contains silver as a primary element, preferably contains copper and / or palladium, and preferably further contains these elements. The non-transparent conductive metal layer in the first electrode, which contains copper as a primary element, preferably contains silver and / or palladium, and preferably further contains these elements.

[0048] In the first electrode, the total content of the elements In, Sn, Zn, Al, Ga, Bi, Nd, Ni, Mn, Na, K, Mg, Ca, C, and Si in the non-transparent conductive metal layer containing silver or copper as a main component is preferably 0.1% by mass or more, and more preferably 0.5% by mass or more, from the viewpoints of achieving low-voltage operation of light-emitting characteristics and improving light-emitting brightness. On the other hand, the total content of the elements In, Sn, Zn, Al, Ga, Bi, Nd, Ni, Mn, Na, K, Mg, Ca, C, and Si is preferably 3% by mass or less, and more preferably 2% by mass or less, from the viewpoints of achieving low-voltage operation of light-emitting characteristics and improving light-emitting brightness.

[0049] <Pixel Division Layer; Pixel Division Layer Portion in Plan View> The display device of the present invention has a pixel division layer. The pixel division layer is a layer that divides adjacent pixel portions and defines the area of ​​each pixel portion. The pixel division layer is preferably a layer that divides the area above the first electrode. If the display device of the present invention has a pixel dimension control layer described below, the pixel dimension control layer also divides adjacent pixel portions and defines the area and dimensions of each pixel portion. The pixel division layer is preferably a cured film formed by curing a photosensitive composition, more preferably a cured film formed by curing a photosensitive composition containing a colorant, and even more preferably a cured film formed by curing a photosensitive composition containing a blackening agent. The pixel division layer is preferably formed so as to overlap a portion of the first electrode described above. This configuration can insulate the first electrode and second electrode in any pixel, thereby preventing pixel non-illumination due to a short circuit between the first electrode and the second electrode. Furthermore, the first electrode in any pixel can be insulated from the first electrode in an adjacent pixel, preventing pixel non-illumination due to a short circuit between the first electrodes.

[0050] The pixel division layer is preferably black in the wavelength of visible light due to the coloring of components such as resins in the photosensitive composition, and more preferably black due to the coloring of components such as resins and a thermal color former and / or an oxidative color former. The pixel division layer is even more preferably black due to the coloring of multiple colorants, and even more preferably black due to the coloring of multiple colorants and a thermal color former and / or an oxidative color former. The pixel division layer is particularly preferably black due to a black agent. Note that "colored" refers to red, orange, yellow, green, blue, or purple.

[0051] The display device of the present invention preferably has a pixel division layer section having a plurality of openings in a planar view. The pixel division layer described above corresponds to the pixel division layer section when viewed in a planar view. In the display device of the present invention, the shape of the pixel section described below is preferably similar or analogous to the shape of the openings in the pixel division layer section, and more preferably the same as the shape of the openings in the pixel division layer section. When the display device of the present invention has a pixel dimension control layer section described below in a planar view, the shape of the pixel section described below is preferably similar or analogous to the shape of the openings in the pixel dimension control layer section, and more preferably the same as the shape of the openings in the pixel dimension control layer section.

[0052] The shape of the pixel portion is preferably a closed polygon, a shape in which at least some of the sides and / or vertices of a closed polygon are replaced with arcs, or a closed shape formed by arcs. Examples of closed polygons include triangles, equilateral triangles, isosceles triangles, right-angled triangles, quadrilaterals, squares, rhombus, rectangles, trapezoids, right-angled trapezoids, and parallelograms. Examples of shapes in which at least some of the sides and / or vertices of a closed polygon are replaced with arcs include triangles, equilateral triangles, isosceles triangles, right-angled triangles, quadrilaterals, squares, rhombus, rectangles, trapezoids, right-angled trapezoids, and parallelograms, where at least some of the sides and / or vertices are replaced with arcs. Examples of closed shapes formed by arcs include circles, perfect circles, and ellipses. The shape of the pixel unit is preferably a square, a diamond, or a rectangle; a square, a diamond, or a rectangle with at least some of its sides and / or vertices replaced with arcs; or a circle or perfect circle. From the viewpoints of suppressing external light reflection, achieving low-voltage operation of light-emitting characteristics, and improving light-emitting brightness, the shape of the pixel unit is preferably a closed polygon or a closed polygon with at least some of its sides and / or vertices replaced with arcs. By changing the shape of the pixel unit from a perfect circle by at least some straight lines, the light emitted from the light-emitting element becomes asymmetric as surface emission, which is strengthened by reflection and interference between the first electrode and the second electrode, thereby significantly reducing the voltage required for light-emitting characteristics and improving light-emitting brightness. Furthermore, by changing the shape of the pixel unit from a perfect circle by at least some straight lines, the scattering of incident external light on the surface of the pixel division layer unit becomes asymmetric, which is weakened by reflection and interference between the first electrode and the second electrode, thereby significantly suppressing external light reflection.

[0053] The shape of the color filter layer portion (to be described later) overlapping with the pixel portion, the shape of the opening of the black matrix layer portion (to be described later) overlapping with the pixel portion, the shape of the spacer layer portion (to be described later), the shape of the overcoat layer portion (to be described later), and the shape of the opening of the overcoat layer portion (to be described later) are preferably a closed polygon, a shape in which at least some of the sides and / or vertices of a closed polygon are replaced with arcs, or a closed shape formed by arcs. The examples and preferred descriptions of the closed polygon, the shape in which at least some of the sides and / or vertices of a closed polygon are replaced with arcs, and the closed shape formed by arcs are as described above.

[0054] The shape of the color filter layer portion (described later) overlapping the pixel portion is preferably similar or identical to the shape of the pixel portion. The shape of the opening of the black matrix layer portion (described later) overlapping the pixel portion is preferably similar or identical to the shape of the pixel portion. The shape of the color filter layer portion is preferably similar or identical to the shape of the opening of the black matrix layer. It is more preferable that the shapes of the pixel portion, the color filter layer portion, and the opening of the black matrix layer are all similar or identical. Any of the shapes of the pixel portion, the color filter layer portion, and the opening of the black matrix layer may not be similar or identical to each other. The shapes of the pixel portion, the color filter layer portion, and the opening of the black matrix layer may not be similar or identical to each other. Figure 4 shows a plan view illustrating an example of the shape of the pixel portion, the shape of the color filter layer, and the shape of the opening of the black matrix layer.

[0055] The pattern dimensions in the long axis direction and the short axis direction for the shape of the pixel portion, the shape of the opening in the pixel dividing layer portion, the shape of the opening in the pixel dimension control layer portion described later, the shape of the spacer layer portion described later, the shape of the color filter layer portion described later, the shape of the opening in the black matrix layer portion described later, the shape of the overcoat layer portion described later, and the shape of the opening in the overcoat layer portion described later will be described below.

[0056] When the shape is a closed polygon, the pattern dimension in the major axis direction refers to the length of the longest straight line that line-symmetrically divides the closed polygon into two. On the other hand, the pattern dimension in the minor axis direction refers to the length of the longest straight line that line-symmetrically divides the shape of a closed polygon in which at least some of the sides and / or vertices have been replaced with arcs. On the other hand, the pattern dimension in the minor axis direction refers to the length of the longest straight line that line-symmetrically divides the shape of a closed polygon in which at least some of the sides and / or vertices have been replaced with arcs. On the other hand, the pattern dimension in the minor axis direction refers to the length of the longest straight line that line-symmetrically divides the shape of a closed polygon in which at least some of the sides and / or vertices have been replaced with arcs. When the shape is a closed shape formed by an arc, the pattern dimension in the major axis direction refers to the length of the longest straight line that line-symmetrically divides the closed shape formed by the arc into two. On the other hand, the pattern dimension in the minor axis direction refers to the length of the longest straight line that line-symmetrically divides the shape of a closed shape formed by an arc into two. When the shape is a circle, a perfect circle, or an ellipse, the pattern dimension in the major axis direction refers to the diameter of the longest circle, while the pattern dimension in the minor axis direction refers to the diameter of the circle perpendicular to the major axis direction.

[0057] The pattern dimensions of the openings in the pixel division layer section and the pixel dimension control layer section described later refer to the length from bottom to bottom of the openings. The average value of the pattern dimensions in the major axis direction of the openings in the pixel division layer section or the pixel dimension control layer section is preferably 5.0 μm or more, more preferably 6.0 μm or more, even more preferably 7.0 μm or more, even more preferably 8.0 μm or more, and particularly preferably 10.0 μm or more, from the viewpoints of suppressing external light reflection, achieving low-voltage driving of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device. On the other hand, the average value of the pattern dimensions in the major axis direction of the openings in the pixel division layer section or the pixel dimension control layer section described later is preferably 50.0 μm or less, more preferably 40.0 μm or less, and even more preferably 35.0 μm or less, from the viewpoints of suppressing external light reflection and improving light-emitting brightness. Furthermore, the average value of the pattern dimension in the major axis direction of the openings in the pixel dividing layer portion or the openings in the pixel dimension control layer portion is preferably 30.0 μm or less, more preferably 25.0 μm or less, even more preferably 20.0 μm or less, still more preferably 17.0 μm or less, and particularly preferably 15.0 μm or less, from the viewpoints of suppressing external light reflection, achieving low-voltage driving of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting element.

[0058] The pattern dimension in the major axis direction of the pixel portion refers to the length from bottom to bottom in the pixel portion. When the pattern dimension in the major axis direction of the pixel portion is (CD) μm and the pattern dimension in the major axis direction of the opening of the pixel dividing layer portion or the opening of the pixel dimension control layer portion corresponding to the pixel portion is (DL) μm, the dimensional difference (ΔCD-DL) μm between (CD) μm and (DL) μm is preferably −2.0 μm or more, more preferably −1.5 μm or more, even more preferably −1.0 μm or more, even more preferably −0.5 μm or more, and particularly preferably −0.2 μm or more. On the other hand, the dimensional difference (ΔCD-DL) μm between (CD) μm and (DL) μm is preferably 2.0 μm or less, more preferably 1.5 μm or less, even more preferably 1.0 μm or less, even more preferably 0.5 μm or less, and particularly preferably 0.2 μm or less. It is most preferable that the pattern dimension in the major axis direction of the pixel portion is the same as the pattern dimension in the major axis direction of the opening in the pixel dividing layer portion or the opening in the pixel dimension control layer portion corresponding to the pixel portion.

[0059] <Pixel Dimension Control Layer; Pixel Dimension Control Layer Portion in Plan View> The display device of the present invention preferably further includes a pixel dimension control layer. The pixel dimension control layer is a layer that contacts both the pixel division layer and the pixel portion and adjusts the dimensions of the region of each pixel portion. The pixel dimension control layer is preferably a layer that adjusts the dimensions of the region on the first electrode divided by the pixel division layer. The pixel dimension control layer is preferably a cured film obtained by curing a photosensitive composition. The pixel dimension control layer is preferably formed so as to overlap a portion of the first electrode. This configuration allows the pattern dimensions of the openings that become the pixel portions to be controlled with high precision, thereby significantly improving the uniformity of the pattern dimensions. As a result, the pattern dimensions of the pixel portion, the color filter layer, and the black matrix layer can be controlled with high precision, resulting in significant effects of suppressing external light reflection, lowering the voltage required for driving light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device.

[0060] The display device of the present invention preferably further includes a pixel dimension control layer portion having a plurality of openings in a plan view. In the display device of the present invention, "covering" means that at least a portion of the pixel dimension control layer directly overlaps with the z-axis direction. The pixel dimension control layer portion corresponds to the pixel dimension control layer as viewed in a plan view. Figure 3 shows a schematic cross-sectional view and a plan view illustrating an example of a display device including a pixel dividing layer and a pixel dimension control layer having a stepped shape.

[0061] <Spacer Layer; Spacer Layer Portion in Plan View> The display device of the present invention preferably further includes a spacer layer. The spacer layer is a layer located above and / or below the pixel division layer. By including the spacer layer, even when the pixel division layer does not have a stepped shape, it is possible to impart a function corresponding to the thick film portion when the pixel division layer has a stepped shape. The spacer layer preferably includes a spacer layer above the pixel division layer and / or a lower spacer layer located below the pixel division layer. The spacer layer is preferably a cured film obtained by curing a photosensitive composition. The spacer layer is preferably formed on a portion of the pixel division layer. This configuration reduces the contact area between the pixel division layer and a vapor deposition mask when forming an organic layer including a light-emitting layer. Therefore, suppressing damage to the pixel division layer significantly reduces a decrease in panel yield and improves the reliability of light-emitting elements.

[0062] The display device of the present invention preferably further includes a spacer layer portion in a planar view. The spacer layer portion corresponds to the above-mentioned spacer layer viewed in a planar view. From the viewpoint of suppressing external light reflection, the shape of the spacer layer portion is preferably a closed polygon or a closed polygon with at least some of the sides and / or vertices replaced with arcs. By changing the shape of the spacer layer portion from a perfect circle by at least some straight lines, the scattering of incident external light on the surface of the spacer layer portion becomes asymmetric and is weakened by reflection and interference between the first electrode and the second electrode, which is presumably resulting in a significant effect of suppressing external light reflection.

[0063] <Colorant in the Pixel Division Layer, Pixel Dimension Control Layer, and Spacer Layer> In the display device of the present invention, the pixel division layer contains a (D-DL) colorant. This configuration allows the pixel division layer to block incident external light, resulting in a significant effect of suppressing external light reflection. Furthermore, the improved light-blocking properties of the pixel division layer at visible light wavelengths and ultraviolet wavelengths suppress outgassing from the pixel division layer and other components, thereby suppressing deterioration of the light-emitting elements, resulting in a significant effect of improving the reliability of the light-emitting elements. The (D-DL) colorant in the pixel division layer is preferably a black agent and / or a mixture of two or more colorants. The (D-DL) colorant in the pixel division layer preferably contains a pigment and / or a dye, and more preferably contains a pigment and a dye.

[0064] In the display device of the present invention, it is preferable that the pixel dividing layer contains a (D-DL) colorant, and the spacer layer satisfies at least one of the following conditions (1) to (3). In the display device of the present invention, it is more preferable that the spacer layer satisfies at least one of the following conditions (1) and (3), and even more preferable that the spacer layer satisfies at least the following condition (1). (1) The spacer layer does not contain a (D-DL) colorant. (2) The spacer layer contains a (D-DL) colorant, and the optical density at the wavelength of visible light per μm of film thickness of the spacer layer is 0.0 to 0.3. (3) The spacer layer contains a compound having a carboxylic acid ester structure containing a (C2x-DL)indene structure and / or a sulfonic acid aryl ester structure containing an indene structure.

[0065] With this configuration, the pixel division layer and the spacer layer are formed by a two-layer film formation method using photosensitive compositions with different compositions, or the spacer layer is formed from a positive-type photosensitive composition. In the two-layer film formation method, the openings of the first layer are again brought into contact with the alkaline developer, thereby suppressing the generation of residues at the openings of the pixel division layer portion or the pixel dimension control layer portion, presumably resulting in significant effects of low-voltage operation and improved luminance. Furthermore, the first pixel division layer is not subjected to half-tone exposure using a half-tone photomask, but is sufficiently photocured by full-tone exposure in the case of a negative-type photomask, thereby significantly reducing its solubility in alkaline developer. Therefore, the surface of the first pixel division layer is a smooth film surface with little roughness, which suppresses the scattering of incident external light, presumably resulting in significant effects of suppressing external light reflection. On the other hand, when the spacer layer is formed from a positive-type photosensitive composition, exposure promotes alkaline dissolution at the openings, suppressing the generation of development residues, presumably resulting in significant effects of low-voltage operation and improved luminance. Furthermore, the solubility of the pixel division layer in an alkaline developer is significantly reduced due to the interaction between the first pixel division layer and the positive photosensitive composition. Therefore, since the surface of the first pixel division layer is a smooth film surface with little roughness, it is presumed that scattering of incident external light is suppressed, thereby significantly suppressing the effect of external light reflection. Furthermore, the presence of a spacer layer significantly suppresses damage to the pixel division layer, thereby significantly suppressing reductions in panel yield and improving the reliability of light-emitting elements. The (D-DL) colorant in the spacer layer is preferably a black agent and / or a mixture of two or more colorants. The (D-DL) colorant in the spacer layer preferably contains a pigment and / or a dye, and more preferably contains a pigment and a dye.

[0066] Hereinafter, the colorants in one or more selected from the group consisting of pixel division layers, pixel dimension control layers, and spacer layers (hereinafter referred to as "pixel division layers, etc.") will be collectively described. The (D-DL) colorant in the pixel division layers, etc. preferably contains a black pigment and / or a mixture of two or more colored pigments from the viewpoints of suppressing external light reflection and improving the reliability of the light-emitting element. The (D-DL) colorant in the pixel division layers, etc. also preferably contains a black dye and / or a mixture of two or more colored dyes from the viewpoints of suppressing external light reflection and improving the reliability of the light-emitting element. The (D-DL) colorant in the pixel division layers, etc. is preferably a (D) colorant, which will be described later.

[0067] The pixel division layer or the like preferably contains a black pigment. With such a configuration, incident external light can be blocked by the pixel division layer or the like, resulting in a significant effect of suppressing external light reflection. Furthermore, the improved light blocking properties of the pixel division layer or the like at visible light wavelengths and ultraviolet wavelengths suppress outgassing from the pixel division layer or the like, thereby suppressing deterioration of the light-emitting element, resulting in a significant effect of improving the reliability of the light-emitting element.

[0068] The pixel dividing layer or the like preferably contains an organic black pigment and / or a mixture of two or more colored pigments, the organic black pigment preferably containing one or more pigments selected from the group consisting of benzofuranone-based black pigments, perylene-based black pigments, and azo-based black pigments, and the mixture of two or more colored pigments preferably containing two or more pigments selected from the group consisting of red, orange, yellow, green, blue, and purple. The organic black pigment more preferably contains a benzofuranone-based black pigment and / or a perylene-based black pigment, and even more preferably contains a benzofuranone-based black pigment. The mixture of two or more color pigments preferably contains one or more pigments selected from the group consisting of anthraquinone pigments, diketopyrrolopyrrole pigments, perylene pigments, isoindoline pigments, isoindolinone pigments, imidazolone pigments, quinacridone pigments, pyranthrone pigments, phthalocyanine pigments, indanthrone pigments, and dioxazine pigments, and more preferably contains one or more pigments selected from the group consisting of perylene pigments, imidazolone pigments, and indanthrone pigments. This configuration significantly reduces external light reflection, improves light-emitting characteristics at low drive voltages, and improves the reliability of the light-emitting device. These pigments in the pixel dividing layer, etc., are believed to promote improved conductivity on the surface of the first electrode facing the light-emitting layer, which corresponds to the openings in the pixel dividing layer section or the pixel dimension control layer section. This is believed to promote improved light-emitting characteristics at low drive voltages. As a result, it is believed that the effect of improving light-emitting brightness at the same drive voltage is significantly improved.

[0069] The benzofuranone black pigment preferably has at least two benzofuran-2(3H)-one structures which may share a benzene ring or at least two benzofuran-3(2H)-one structures which may share a benzene ring, and more preferably contains a compound having a structure represented by either general formula (161) or general formula (162), a geometric isomer thereof, a salt thereof, or a salt of a geometric isomer thereof.

[0070] In the display device of the present invention, when the pixel dividing layer or the like contains an organic black pigment and / or a mixture of two or more colored pigments, the pixel dividing layer or the like preferably contains a benzofuranone-based black pigment, and the benzofuranone-based black pigment preferably contains a compound having a structure represented by either general formula (161) or general formula (162), a geometric isomer thereof, a salt thereof, or a salt of a geometric isomer thereof. The benzofuranone-based black pigment in the pixel dividing layer or the like is preferably a benzofuranone-based black pigment described below. This configuration significantly reduces external light reflection, improves light-emitting characteristics at low drive voltages, and improves the reliability of the light-emitting device. It is believed that the benzofuranone-based black pigment in the pixel dividing layer or the like promotes surface modification of the surface of the first electrode on the light-emitting layer side, corresponding to the openings in the pixel dividing layer section or the openings in the pixel dimension control layer section. Therefore, it is believed that adjusting the work function difference promotes low-voltage drive of light-emitting characteristics. As a result, it is believed that the effect of improving light-emitting brightness at the same drive voltage is significantly improved. Furthermore, the benzofuranone-based black pigment has superior light-shielding properties per unit mass of the pigment compared to general organic pigments, and therefore exhibits remarkable effects in suppressing external light reflection and improving the reliability of light-emitting devices. Furthermore, the benzofuranone-based black pigment has superior insulating properties and low dielectric constant compared to general organic pigments and inorganic pigments, and therefore exhibits remarkable effects in improving the reliability of light-emitting devices.

[0071]

[0072] In the general formula (161) and the general formula (162), R ３４１ ~R ３４４ R each independently represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 10 carbon atoms. ３４５ ~R ３４８ are each independently a halogen atom, R ３５３ , COOH, COOR ３５３ , COO － , C.O.N.H. ２ , CONHR ３５３ , C.O.R. ３５３ R ３５４ , CN, OH, OR ３５３ , O.C.O.R. ３５３ , OCONH ２ , OCONHR ３５３ , OCONR３５３ R ３５４ , NO ２ , N.H. ２ , N.H.R. ３５３ , N.R. ３５３ R ３５４ , NHCOR ３５３ , N.R. ３５３ COR ３５４ , N=CH ２ , N=CHR ３５３ , N=CR ３５３ R ３５４ , S.H., S.R. ３５３ , SOR ３５３ , S.O. ２ R ３５３ , S.O. ３ R ３５３ , S.O. ３ H, SO ３ － , S.O. ２ NH ２ , S.O. ２ NHR ３５３ , or SO ２ NR ３５３ R ３５４ Represents R ３５３ and R ３５４ each independently represents an alkyl group having 1 to 10 carbon atoms, a cycloalkyl group having 4 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a cycloalkenyl group having 4 to 10 carbon atoms, or an alkynyl group having 2 to 10 carbon atoms. ３４５ ~R ３４８ are directly bonded to each other or are bonded to an oxygen atom bridge, a sulfur atom bridge, an NH bridge, or an NR ３５３ A ring may be formed by a bridge. ３４９ ~R ３５２ each independently represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or an aryl group having 6 to 15 carbon atoms. a, b, c, and d each independently represent an integer of 0 to 4. The above-mentioned alkyl group, cycloalkyl group, alkenyl group, cycloalkenyl group, alkynyl group, and aryl group may have a heteroatom, and may be either unsubstituted or substituted.

[0073] The perylene-based black pigment preferably has a perylene structure, more preferably contains a compound having a structure represented by any one of general formulas (164) to (166) or a salt thereof, and even more preferably contains a compound having a 3,4,9,10-perylenetetracarboxylic acid bisbenzimidazole structure, a geometric isomer thereof, a salt thereof, or a salt of a geometric isomer thereof. The perylene-based black pigment in the pixel dividing layer or the like is preferably a perylene-based black pigment described below.

[0074]

[0075] In the general formulae (164) to (166), X ２４１ and X ２４２ each independently represents a direct bond or an alkylene group having 1 to 10 carbon atoms. ２４１ and Y ２４２ R each independently represents a direct bond or an arylene group having 6 to 15 carbon atoms. ３６１ and R ３６２ R each independently represents a hydrogen atom, a hydroxy group, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an acyl group having 2 to 6 carbon atoms. ３６３ ~R ３６９ are each independently a hydroxy group, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an acyl group having 2 to 6 carbon atoms, a halogen atom, R ３７０ , COOH, COOR ３７０ , COO － , C.O.N.H. ２ , CONHR ３７０ , C.O.R. ３７０ R ３７１ , CN, OH, OR ３７０ , O.C.O.R. ３７０ , OCONH ２ , OCONHR ３７０ , OCONR ３７０ R ３７１ , NO ２ , N.H. ２ , N.H.R. ３７０ , N.R. ３７０ R ３７１ , NHCOR ３７０ , N.R. ３７０ COR ３７１ , N=CH２ , N=CHR ３７０ , N=CR ３７０ R ３７１ , S.H., S.R. ３７０ , SOR ３７０ , S.O. ２ R ３７０ , S.O. ３ R ３７０ , S.O. ３ H, SO ３ － , S.O. ２ NH ２ , S.O. ２ NHR ３７０ , or SO ２ NR ３７０ R ３７１ Represents R ３７０ and R ３７１ each independently represents an alkyl group having 1 to 10 carbon atoms, a cycloalkyl group having 4 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a cycloalkenyl group having 4 to 10 carbon atoms, or an alkynyl group having 2 to 10 carbon atoms. ３６７ ~R ３６９ are directly bonded to each other or are bonded to an oxygen atom bridge, a sulfur atom bridge, an NH bridge, or an NR ３７０ A ring may be formed by a bridge. a and b each independently represent an integer of 0 to 5. c, d, e, and f each independently represent an integer of 0 to 4. g, h, and i each independently represent an integer of 0 to 8. X ２４１ and X ２４２ is a direct bond, and Y ２４１ and Y ２４２ When is a direct bond, R ３６１ and R ３６２ are each independently preferably a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, and a and b are each 1. ２４１ and X ２４２ is an alkylene group having 1 to 10 carbon atoms, and Y ２４１ and Y ２４２ When is a direct bond, R ３６１ and R ３６２ is preferably a hydroxy group, and a and b are 1. ２４１ and X ２４２ is an alkylene group having 1 to 10 carbon atoms, and Y ２４１ and Y２４２ is an arylene group having 6 to 15 carbon atoms, R ３６１ and R ３６２ are each independently preferably a hydroxy group, an alkoxy group having 1 to 6 carbon atoms, or an acyl group having 2 to 6 carbon atoms, and a and b are each independently an integer of 0 to 5. The above-mentioned alkylene group, arylene group, alkyl group, alkoxy group, and acyl group may have a heteroatom, and may be either unsubstituted or substituted.

[0076] The azo black pigment preferably has an azo group, more preferably contains a compound having an azomethine structure and a carbazole structure or a salt thereof, and further preferably contains a compound having a structure represented by general formula (168) or a salt thereof. The azo black pigment in the pixel dividing layer or the like is preferably an azo black pigment described below.

[0077]

[0078] In the general formula (168), X ２５１ represents an arylene group having 6 to 15 carbon atoms. ２５１ represents an arylene group having 6 to 15 carbon atoms. ３８１ ~R ３８３ are each independently a halogen atom, R ３９０ , COOH, COOR ３９０ , COO － , C.O.N.H. ２ , CONHR ３９０ , C.O.R. ３９０ R ３９１ , CN, OH, OR ３９０ , O.C.O.R. ３９０ , OCONH ２ , OCONHR ３９０ , OCONR ３９０ R ３９１ , NO ２ , N.H. ２ , N.H.R. ３９０ , N.R. ３９０ R ３９１ , NHCOR ３９０ , N.R. ３９０ COR ３９１ , N=CH ２ , N=CHR ３９０ , N=CR ３９０R ３９１ , S.H., S.R. ３９０ , SOR ３９０ , S.O. ２ R ３９０ , S.O. ３ R ３９０ , S.O. ３ H, SO ３ － , S.O. ２ NH ２ , S.O. ２ NHR ３９０ , or SO ２ NR ３９０ R ３９１ Represents R ３９０ and R ３９１ each independently represents an alkyl group having 1 to 10 carbon atoms, a cycloalkyl group having 4 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a cycloalkenyl group having 4 to 10 carbon atoms, or an alkynyl group having 2 to 10 carbon atoms. ３８１ ~R ３８３ are directly bonded to each other or are bonded to an oxygen atom bridge, a sulfur atom bridge, an NH bridge, or an NR ３９０ A ring may be formed by a bridge. ３８４ represents a halogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or a nitro group. ３８５ represents a halogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an acylamino group having 2 to 10 carbon atoms, or a nitro group. ３８６ ~R ３８９ each independently represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms. a represents an integer of 0 to 4. b represents an integer of 0 to 2. c represents an integer of 0 to 4. d and e each independently represent an integer of 0 to 8. n represents an integer of 1 to 4. The above-mentioned arylene group, alkyl group, alkoxy group, and acylamino group may have a heteroatom, and may be either unsubstituted or substituted.

[0079] The primary particle size and average primary particle size of the pigment in the pixel division layer etc. are preferably 20 to 150 nm. From the viewpoint of improving the reliability of the light-emitting element, the primary particle size and average primary particle size of the pigment in the pixel division layer etc. are preferably 20 nm or more, more preferably 30 nm or more, even more preferably 40 nm or more, even more preferably 50 nm or more, and particularly preferably 60 nm or more. On the other hand, from the viewpoint of suppressing external light reflection and improving the reliability of the light-emitting element, the primary particle size and average primary particle size of the pigment in the pixel division layer etc. are preferably 150 nm or less, more preferably 120 nm or less, even more preferably 100 nm or less, even more preferably 90 nm or less, and particularly preferably 80 nm or less. The primary particle size of the pigment refers to the major axis diameter of the primary particles of the pigment.

[0080] The primary particle diameter of the pigment in the pixel division layer, etc., can be measured by using a thin slice of the pixel division layer, etc., as a measurement sample, polishing the cross section by ion milling to enhance smoothness, and observing a location located within a depth direction of 0.2 to 0.8 μm from the surface of the pixel division layer, etc., using a transmission electron microscope (hereinafter "TEM") at a magnification of 50,000x, and measuring the image using image analysis particle size distribution measurement software (Mac-View; manufactured by MOUNTECH). The average primary particle diameter of the pigment in the pixel division layer, etc., can be calculated by imaging and analyzing the cross section of the measurement sample, and measuring the average value of 30 primary particles of the pigment in the pixel division layer, etc. Furthermore, the elements constituting the particles can be identified by observation using transmission electron microscope-energy dispersive X-ray spectroscopy (hereinafter "TEM-EDX").

[0081] The pixel dividing layer or the like contains a black dye and / or a mixture of two or more colored dyes, and the black dye preferably contains an azo-based black dye, and the mixture of two or more colored dyes preferably contains two or more dyes selected from the group consisting of red, orange, yellow, green, blue, and purple. The black dye is preferably an azo-based black dye. Solvent Black 27-47 is preferred, and Solvent Black 27, 29, or 34 is more preferred (all numbers are C.I. numbers). Examples of black dyes include VALIFAST® Black 3804 (Solvent Black 34), VALIFAST® Black 3810 (Solvent Black 29), VALIFAST® Black 3820 (Solvent Black 27), VALIFAST® Black 3830 (Solvent Black 27), and NUBIAN® Black TN-870 (Solvent Black 7) (all manufactured by Orient Chemical Industry Co., Ltd.). The mixture of two or more colored dyes preferably contains one or more dyes selected from the group consisting of squarylium dyes, xanthene dyes, triarylmethane dyes, and phthalocyanine dyes, more preferably xanthene dyes and / or triarylmethane dyes, and even more preferably xanthene dyes. This configuration significantly reduces external light reflection, improves light-emitting characteristics at low drive voltages, and improves the reliability of the light-emitting device. These dyes in the pixel dividing layer or the like are believed to promote improved conductivity on the surface of the first electrode facing the light-emitting layer, which corresponds to the openings in the pixel dividing layer section or the pixel dimension control layer section. This is believed to promote improved light-emitting characteristics at low drive voltages. As a result, it is believed that the effect of improving light-emitting brightness at the same drive voltage is significantly improved.

[0082] In the display device of the present invention, it is preferable that the pixel dividing layer or the like contains a (D-DL) colorant and further contains a compound having a structure derived from a thermal color former and / or a compound having a structure derived from an oxidative color former. By adopting such a configuration, the effects of suppressing external light reflection and improving the reliability of the light-emitting element are remarkable.

[0083] The compound having a structure derived from a thermal color former is preferably a compound having a structure obtained after the thermal color former has undergone structural change or decomposition by heating under an inert atmosphere, and more preferably a compound having a quinone structure and / or a quinoid structure. The compound having a quinone structure and / or a quinoid structure more preferably includes the following (Q1) compound and / or (Q2) compound. The inert atmosphere is preferably a nitrogen, helium, neon, argon, krypton, or xenon atmosphere, a gas atmosphere containing 1 to less than 10,000 ppm by mass (0.0001 to 1% by mass) of oxygen, or a vacuum. (Q1) A compound having a quinone structure and / or a quinoid structure and an aromatic structure. (Q2) A compound having two or more quinone structures and / or two or more quinoid structures.

[0084] The compound having a structure derived from an oxidative color former is preferably a compound having a structure obtained after the oxidative color former has undergone structural change or decomposition by heating under an oxygen-containing gas atmosphere, and more preferably a compound having a quinone structure and / or a quinoid structure. The compound having a quinone structure and / or a quinoid structure further preferably includes the above-mentioned (Q1) compound and / or (Q2) compound. The oxygen-containing gas atmosphere is preferably air or an oxygen atmosphere, or a gas atmosphere containing 10,000 mass ppm (1 mass %) or more of oxygen.

[0085] <Inorganic particles in pixel division layer, pixel dimension control layer, and spacer layer; silica particles> Hereinafter, inorganic particles and silica particles in pixel division layers etc. will be collectively described. The pixel division layer etc. preferably contains inorganic particles. With such a configuration, the robust structure of the inorganic particles in the pixel division layer etc. significantly improves the heat resistance of the pixel division layer etc., and outgassing from the pixel division layer etc. is suppressed. As a result, deterioration of the light-emitting element is suppressed, and the effect of improving the reliability of the light-emitting element is significantly achieved. The inorganic particles in the pixel division layer etc. are preferably inorganic particles (H) described below.

[0086] The inorganic particles in the pixel dividing layer or the like preferably contain Si, Al, Ti, V, Zn, Zr, Nb, Sn, Li, Cr, Mn, Fe, Co, Ni, Cu, Sr, Ag, Ba, La, Ce, Ta, W, or Re as the main component element, more preferably silicon, aluminum, titanium, vanadium, chromium, iron, cobalt, copper, zinc, zirconium, niobium, tin, or cerium as the main component element, and even more preferably silicon as the main component element. The main component element in the inorganic particles refers to the element that is most abundant among the constituent elements of the inorganic particles. Note that the determination is based on the mass of any one of the above elements alone. By including these elements as the main component elements, outgassing from the pixel dividing layer or the like is suppressed, thereby significantly improving the reliability of the light-emitting element. The inorganic particles in the pixel dividing layer or the like are preferably silica particles, alumina particles, titania particles, vanadium oxide particles, chromium oxide particles, iron oxide particles, cobalt oxide particles, copper oxide particles, zinc oxide particles, zirconium oxide particles, niobium oxide particles, tin oxide particles, or cerium oxide particles, and more preferably silica particles.

[0087] It is more preferable that the pixel division layer, etc., contain silica particles. This configuration, like the inorganic particles in the pixel division layer, etc., suppresses degradation of the light-emitting element, thereby significantly improving the reliability of the light-emitting element. In addition, it is believed that this promotes surface modification on the surface of the first electrode on the light-emitting layer side, which corresponds to the opening of the pixel division layer portion or the opening of the pixel dimension control layer portion. Therefore, it is believed that adjusting the work function difference promotes low-voltage driving of the light-emitting characteristics. As a result, it is believed that the effect of improving light-emitting brightness when driven at the same voltage is significantly improved. Furthermore, the silica particles in the pixel division layer, etc., reduce the reflection and scattering of incident external light on the surface of the pixel division layer, etc., thereby significantly suppressing external light reflection. The silica particles in the pixel division layer, etc., are preferably (H1) silica particles, as described below.

[0088] The primary particle size and average primary particle size of the silica particles in the pixel division layer, etc. are preferably 5 to 50 nm. From the viewpoint of improving the reliability of the light-emitting device, the primary particle size and average primary particle size of the silica particles in the pixel division layer, etc. are preferably 5 nm or more, more preferably 7 nm or more, and even more preferably 10 nm or more. On the other hand, from the viewpoint of suppressing external light reflection and improving the reliability of the light-emitting device, the primary particle size and average primary particle size of the silica particles in the pixel division layer, etc. are preferably 50 nm or less, more preferably 40 nm or less, even more preferably 30 nm or less, even more preferably 25 nm or less, particularly preferably 20 nm or less, and most preferably 15 nm or less. The primary particle size of the silica particles refers to the major axis diameter of the primary particles of the silica particles. However, silicon dioxide contained in the surface treatment agent or coating layer of organic pigments and inorganic pigments is not considered to be silica particles, regardless of its primary particle size or aspect ratio.

[0089] The primary particle size and aspect ratio of the silica particles in the pixel division layer, etc. can be measured by using a thinly cut pixel division layer, etc. as a measurement sample, polishing the cross section by ion milling to enhance smoothness, and observing a location located within a range of 0.2 to 0.8 μm in the depth direction from the surface of the pixel division layer, etc., using a TEM at a magnification of 50,000x, and measuring the image using image analysis particle size distribution measurement software (Mac-View; manufactured by MOUNTECH). The average primary particle size of the silica particles in the pixel division layer, etc. can be calculated by imaging and analyzing the cross section of the measurement sample, and measuring the average value of 30 primary particles of the silica particles in the pixel division layer, etc. Furthermore, observation with TEM-EDX allows the elements constituting the particles to be identified, making it possible to identify the silica particles in the pixel division layer, etc.

[0090] The pixel dividing layer or the like contains silica particles having a primary particle diameter or an average primary particle diameter of 5 to 50 nm, and may further contain silica particles having a primary particle diameter or an average primary particle diameter of less than 5 nm and / or silica particles having a primary particle diameter or an average primary particle diameter of more than 50 nm.

[0091] The silica particles in the pixel dividing layer or the like preferably have a functional group on their surface. The functional group on the surface of the silica particles is preferably a reaction residue of a surface modifying group containing a radical polymerizable group, a reaction residue of a surface modifying group containing a thermally reactive group, a silanol group, an alkoxysilyl group, an alkylsilyl group, a dialkylsilyl group, a trialkylsilyl group, a phenylsilyl group, or a diphenylsilyl group, and from the viewpoints of suppressing external light reflection, achieving low-voltage driving of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device, a reaction residue of a surface modifying group containing a radical polymerizable group or a reaction residue of a surface modifying group containing a thermally reactive group is more preferred.

[0092] The radical polymerizable group is preferably a styryl group, a cinnamoyl group, a maleimide group, a nadimide group, a (meth)acryloyl group, a vinyl group, or an allyl group, and the thermally reactive group is preferably an alkoxymethyl group, a methylol group, an epoxy group, an oxetanyl group, or a blocked isocyanate group.

[0093] From the viewpoint of improving the reliability of the light-emitting device, the silica particles in the pixel dividing layer or the like preferably contain silica particles containing sodium element. The sodium element may exist in the form of, for example, ions (Na ＋) or a salt with a silanol group (Si—ONa). The content of sodium element relative to all silica particles in the pixel dividing layer or the like is preferably 1 ppm by mass or more, more preferably 5 ppm by mass or more, even more preferably 10 ppm by mass or more, and particularly preferably 50 ppm by mass or more. Furthermore, from the viewpoint of improving the reliability of the light-emitting element, it is preferably 100 ppm by mass or more, more preferably 300 ppm by mass or more, and even more preferably 500 ppm by mass or more. On the other hand, the content of sodium element relative to all silica particles in the pixel dividing layer or the like is preferably 10,000 ppm by mass or less, more preferably 7,000 ppm by mass or less, even more preferably 5,000 ppm by mass or less, even more preferably 3,000 ppm by mass or less, and particularly preferably 1,000 ppm by mass or less. Silica particles containing sodium element can be obtained by reacting sodium silicate, which is a strong alkali as a silicon source, with a mineral acid, which is a strong acid, under alkaline conditions. The sodium element contained in the silica particles can be detected in the center, which is the intersection of the major axis and minor axis, by imaging and analyzing the cross section of the primary particle of the silica particle using the above-mentioned TEM-EDX.

[0094] <Resins in pixel division layer, pixel dimension control layer, and spacer layer> Resins in the pixel division layer, etc. will be described collectively below. The pixel division layer, etc. preferably contains the following (A1-DL) resin and / or (A3-DL) resin. (A1-DL) resin: a resin having a structural unit containing one or more types selected from the group consisting of an imide structure, an amide structure, an oxazole structure, and a siloxane structure. (A3-DL) resin: a resin having a structural unit containing a phenolic hydroxyl group.

[0095] This configuration significantly reduces external light reflection, lowers the driving voltage of light-emitting characteristics, improves light-emitting brightness, and improves the reliability of light-emitting devices. It is believed that this is because the (A1-DL) resin and (A3-DL) resin in the pixel dividing layer, etc., absorb light of visible wavelengths, resulting in a significant effect of suppressing external light reflection. It is also believed that the (A1-DL) resin and (A3-DL) resin in the pixel dividing layer, etc., promote surface modification on the light-emitting layer-side surface of the first electrode, which corresponds to the opening of the pixel dividing layer portion or the opening of the pixel dimension control layer portion. Therefore, it is believed that adjusting the work function difference promotes lower driving voltage of light-emitting characteristics. As a result, it is believed that the effect of improving light-emitting brightness when driven at the same voltage is significantly improved. In addition, the excellent heat resistance of the imide structure, amide structure, oxazole structure, or siloxane structure of the (A1-DL) resin, or the aromatic ring skeleton of the (A3-DL) resin, suppresses outgassing from the pixel dividing layer, etc., resulting in a significant effect of improving the reliability of light-emitting devices. The (A1-DL) resin in the pixel dividing layer etc. is preferably a resin having a structure derived from the (A1) resin described below and / or a structure derived from the (A2) resin described below. The (A3-DL) resin in the pixel dividing layer etc. is preferably a resin having one or more types selected from the group consisting of a structure derived from the (A3) resin described below, a structure derived from the (A1) resin described below, and a structure derived from the (A2) resin described below.

[0096] The pixel dividing layer etc. preferably contains the following (A2-DL) resin. The pixel dividing layer etc. contains an (A1-DL) resin and / or an (A3-DL) resin, and more preferably further contains an (A2-DL) resin. The pixel dividing layer etc. further preferably contains an (A1-DL) resin and an (A2-DL) resin, and particularly preferably contains an (A1-DL) resin, an (A2-DL) resin, and an (A3-DL) resin. (A2-DL) resin: a resin having a structural unit represented by general formula (24).

[0097]

[0098] In general formula (24), R ６７ ~R ６９each independently represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and a is 0 or 1. １ represents a bond point in the resin.

[0099] The structural unit represented by general formula (24) preferably contains a reaction residue of an ethylenically unsaturated double bond group. The reaction residue of an ethylenically unsaturated double bond group refers to a residue remaining after the ethylenically unsaturated double bond group has been radically polymerized by light and / or heat. The reaction residue of the ethylenically unsaturated double bond group is preferably a residue remaining after the ethylenically unsaturated double bond group in the (A2) resin described below has been radically polymerized, and more preferably a residue remaining after the ethylenically unsaturated double bond group in the (A2) resin described below has been radically polymerized with the (B) radically polymerizable compound described below.

[0100] By adopting such a configuration, the effect of improving the reliability of the light-emitting element becomes significant. The (A2-DL) resin in the pixel dividing layer, etc. is a resin in which crosslinking density is improved by radically polymerizing a radically polymerizable group such as a (meth)acryloyl group. It is presumed that the excellent heat resistance of the crosslinked structure of the (A2-DL) resin suppresses outgassing from the pixel dividing layer, etc., thereby significantly improving the reliability of the light-emitting element. The (A2-DL) resin in the pixel dividing layer, etc. is preferably a resin having a structure derived from the (A2) resin described below and / or a structure derived from the (A3) resin described below.

[0101] The (A1-DL) resin in the pixel dividing layer or the like preferably has one or more structural units selected from the group consisting of structural units represented by any one of general formulas (1), (2), (3), (4), (5), (6), (9), and (10) described below.

[0102] The (A3-DL) resin in the pixel dividing layer or the like preferably has one or more structural units selected from the group consisting of structural units represented by any of the general formulas (31), (32), (33), (34), (35), (36), (38), (39), and (40) described below. These resins preferably have a phenolic hydroxyl group as an acidic group in at least one of the main chain, side chain, and terminal end of the resin, and contain an aromatic ring skeleton within the structural unit of the resin. More preferably, the structural unit of the resin has a phenolic hydroxyl group as an acidic group and contains an aromatic ring skeleton. It is also preferable that some of the phenolic hydroxyl groups contained in the resin react with other resins or compounds to form a crosslinked structure.

[0103] The (A2-DL) resin in the pixel dividing layer or the like preferably has one or more structural units selected from the group consisting of structural units represented by any of the general formulas (1), (2), (3), (4), (5), (6), (9), and (10) described below. The (A2-DL) resin in the pixel dividing layer or the like preferably has one or more structural units selected from the group consisting of structural units having a fused polycyclic structure; structural units having a fused polycyclic heterocyclic structure; structural units having a structure in which an aromatic ring skeleton and an alicyclic skeleton are directly linked, and structural units having a structure in which at least two aromatic ring skeletons are directly linked. The fused polycyclic structure is preferably a naphthalene structure, a fluorene structure, or an indane structure. The fused polycyclic heterocyclic structure is preferably a xanthene structure, an indolinone structure, or an isoindolinone structure. The alicyclic skeleton is preferably a tricyclo[5.2.1.0 ２，６ ]decane structure is preferred. The structure in which at least two aromatic ring skeletons are directly linked is preferably a biphenyl structure. The (A2-DL) resin in the pixel dividing layer or the like preferably has one or more structures selected from the group consisting of a novolac structure, a cresol novolac structure, a triphenylalkane structure, a diphenyl-phenylalkylphenylalkane structure, and a diphenylalkane structure.

[0104] <Compounds in the Pixel Dividing Layer, Pixel Dimension Control Layer, and Spacer Layer> The compounds in the pixel dividing layer, etc. will be described collectively below. The pixel dividing layer, etc. preferably contains a compound having a structure derived from a (C1-DL) photopolymerization initiator (hereinafter referred to as "(C1-DL) compound") and / or a compound having a structure derived from a (C2-DL) naphthoquinone diazide compound (hereinafter referred to as "(C2-DL) compound"). The (C1-DL) compound in the pixel dividing layer, etc. is preferably a compound having a structure derived from a photopolymerization initiator containing an oxime ester structure and / or a compound having a structure derived from a photopolymerization initiator containing an oxime ester carbonyl structure. The (C2-DL) compound in the pixel dividing layer, etc. is preferably a compound having a structure derived from a 1,2-naphthoquinone diazide-5-sulfonic acid ester compound and / or a compound having a structure derived from a 1,2-naphthoquinone diazide-4-sulfonic acid ester compound. The pixel dividing layer preferably contains a compound having a carboxylic acid ester structure containing an indene structure and / or a sulfonic acid aryl ester structure containing an indene structure.

[0105] By adopting such a configuration, the effects of suppressing external light reflection and improving the reliability of the light-emitting device are significant. It is presumed that this is because the (C1-DL) compound and (C2-DL) compound in the pixel dividing layer, etc., absorb light of visible light wavelengths, resulting in a significant effect of suppressing external light reflection. Furthermore, the (C1-DL) compound in the pixel dividing layer, etc., is a compound having a residue contained in the pixel dividing layer, etc., after radical polymerization of a radically polymerizable compound having a (meth)acryloyl group or the like to improve the crosslink density of the film. The (C2-DL) compound in the pixel dividing layer, etc., is a compound having a residue contained in the pixel dividing layer, etc., after forming a crosslinked structure during thermal curing or the like to improve the crosslink density of the film. Therefore, it is presumed that the (C1-DL) compound and (C2-DL) compound in the pixel dividing layer, etc., are incorporated as part of the crosslinked structure in the pixel dividing layer, etc., thereby improving the crosslink density of the film and suppressing outgassing from the pixel dividing layer, etc., resulting in a significant effect of improving the reliability of the light-emitting device.

[0106] It is more preferable that the pixel dividing layer etc. contain the following (C1x-DL) compound and / or (C2x-DL) compound: (C1x-DL) compound: a compound having a fluorene structure, a benzofluorene structure, a dibenzofluorene structure, a carbazole structure, a benzocarbazole structure, an indole structure, a benzoindole structure, or a diphenyl sulfide structure, and having a structure in which an imino group is bonded to these structures and / or a structure in which a carbonyl group is bonded to these structures (C2x-DL) compound: a compound having a carboxylic acid ester structure containing an indene structure and / or a sulfonic acid aryl ester structure containing an indene structure.

[0107] The (C1x-DL) compound in the pixel dividing layer etc. is preferably a compound having a fluorene structure, a benzofluorene structure, a dibenzofluorene structure, a carbazole structure, or a benzocarbazole structure, and more preferably a compound having an imino group bonded to any of these structures. The (C2x-DL) compound in the pixel dividing layer etc. is preferably a compound having a 1H-indene-3-carboxylic acid ester-7-aryl ester structure and / or a compound having a 1H-indene-1-aryl ester-3-carboxylic acid ester structure.

[0108] This configuration significantly reduces external light reflection, lowers the voltage required for driving light-emitting characteristics, and improves the reliability of light-emitting devices. It is believed that this is because the fused polycyclic structure, fused polycyclic heterocyclic structure, or aromatic ring skeleton of the (C1x-DL) compound in the pixel dividing layer, etc., and the carboxylic acid ester structure containing an indene structure and the sulfonic acid aryl ester structure containing an indene structure of the (C2x-DL) compound absorb light of visible wavelengths, resulting in a significant effect of suppressing external light reflection. It is also believed that the (C1x-DL) compound and (C2x-DL) in the pixel dividing layer, etc., promote surface modification of the surface of the first electrode on the light-emitting layer side, corresponding to the openings in the pixel dividing layer section or the pixel dimension control layer section. Therefore, it is believed that adjusting the work function difference promotes lower-voltage driving of light-emitting characteristics. As a result, it is believed that the effect of improving light-emitting brightness when driven at the same voltage is significantly improved. In addition, the (C1x-DL) compound in the pixel dividing layer, etc. is a compound having a residue contained in the pixel dividing layer, etc., after radical polymerization of a radically polymerizable compound having a (meth)acryloyl group or the like to improve the crosslink density of the film. The (C2x-DL) compound in the pixel dividing layer, etc. is a compound having a residue contained in the pixel dividing layer, etc., after forming a crosslinked structure during thermal curing or the like to improve the crosslink density of the film. Therefore, it is presumed that the (C1x-DL) compound and (C2x-DL) compound in the pixel dividing layer, etc., are incorporated as part of the crosslinked structure in the pixel dividing layer, etc., thereby improving the crosslink density of the film and suppressing outgassing from the pixel dividing layer, etc., thereby significantly improving the reliability of the light-emitting device. The (C1-DL) compound and (C1x-DL) compound in the pixel dividing layer, etc. are preferably compounds having a structure derived from the (C1) compound described below, and more preferably compounds having a structure derived from the (C1-1) compound described below. The (C2-DL) compound and (C2x-DL) compound in the pixel dividing layer or the like are preferably compounds having a structure derived from the (C2) compound described below.

[0109] A display device according to a second aspect of the present invention has a pixel dividing layer containing one or more compounds selected from the group consisting of the following (I1a-DL) compound, (I1b-DL) compound, (I2a-DL) compound, and (I2b-DL) compound, wherein the (I1a-DL) compound and (I2a-DL) compound have the following (I-Ia) structure, the (I1b-DL) compound and (I2b-DL) compound have the following (I-Ib) structure, and the display device satisfies one or more of the following conditions (1a-DL) and (1b-DL), or one or more of the following conditions (2a-DL) and (2b-DL).(I1a-DL) compound: one or more compounds selected from the group consisting of thiol structure-containing compounds, sulfide structure-containing compounds, disulfide structure-containing compounds, sulfoxide structure-containing compounds, sulfone structure-containing compounds, sultone structure-containing compounds, thiophene structure-containing compounds, and sulfonic acid structure-containing compounds. (I1b-DL) compound: a compound having, as an anion species, one or more selected from the group consisting of a sulfide ion structure, a hydrogen sulfide ion structure, a sulfate ion structure, and a hydrogen sulfate ion structure, and having, as a cation species, an ammonium ion structure, a primary ammonium ion structure, a secondary ammonium ion structure, a tertiary ammonium ion structure, or a quaternary ammonium ion structure. (I2a-DL) compound: one or more compounds selected from the group consisting of alkyl chloride structure-containing compounds, cycloalkyl chloride structure-containing compounds, aryl chloride structure-containing compounds, alkyl bromide structure-containing compounds, cycloalkyl bromide structure-containing compounds, and aryl bromide structure-containing compounds. (I2b-DL) Compound: A compound having a chloride ion structure and / or a bromide ion structure as an anion species, and an ammonium ion structure, a primary ammonium ion structure, a secondary ammonium ion structure, a tertiary ammonium ion structure, or a quaternary ammonium ion structure as a cation species. (I-Ia) Structure: A structure containing one or more groups selected from the group consisting of a mono- to divalent aliphatic group having 4 to 30 carbon atoms, an alkylaryl group having 10 to 30 carbon atoms, an arylalkyl group having 10 to 30 carbon atoms, and an aryl group having 7 to 15 carbon atoms. (I-Ib) Structure: A structure containing one or more groups selected from the group consisting of a mono- to divalent aliphatic group having 1 to 6 carbon atoms, an alkylaryl group having 10 to 30 carbon atoms, an arylalkyl group having 10 to 30 carbon atoms, and an aryl group having 7 to 15 carbon atoms. (1a-DL) The content of sulfur element in the pixel dividing layer is 0.01 to 500 mass ppm. (1b-DL) The total content of sulfide ions, hydrogen sulfide ions, sulfate ions, and hydrogen sulfate ions in the pixel dividing layer is 0.01 to 1,000 ppm by mass. (2a-DL) The total content of chlorine and bromine elements in the pixel dividing layer is 0.01 to 500 ppm by mass. (2b-DL) The total content of chloride ions and bromide ions in the pixel dividing layer is 0.01 to 1,000 ppm by mass.

[0110] It is believed that by incorporating a compound having a structure containing sulfur, a compound having a structure containing the above-mentioned sulfur-based anion, a compound having a structure containing chlorine, a compound having a structure containing bromine, or a compound having a structure containing the above-mentioned halogen anion in the pixel dividing layer, excellent light-emitting characteristics that enable low-voltage operation are achieved by adjusting the work function difference. As a result, it is believed that high light-emitting brightness is achieved when driven at the same voltage. Furthermore, it is believed that high reliability of the light-emitting element is achieved by controlling the polarization structure and charge balance in the pixel dividing layer in, for example, an organic EL display. Furthermore, it is believed that high reliability of the light-emitting element is achieved by suppressing migration and aggregation of metal in the first electrode.

[0111] In the display device of the present invention, the pixel dividing layer or the like preferably contains one or more compounds selected from the group consisting of the following (I1a-DL) compound, (I1b-DL) compound, (I2a-DL) compound, and (I2b-DL) compound. (I1a-DL) compound: one or more compounds selected from the group consisting of thiol structure-containing compounds, sulfide structure-containing compounds, disulfide structure-containing compounds, sulfoxide structure-containing compounds, sulfone structure-containing compounds, sultone structure-containing compounds, thiophene structure-containing compounds, and sulfonic acid structure-containing compounds. (I1b-DL) compound: a compound having, as an anion species, one or more selected from the group consisting of a sulfide ion structure, a hydrogen sulfide ion structure, a sulfate ion structure, and a hydrogen sulfate ion structure, and having, as a cation species, an ammonium ion structure, a primary ammonium ion structure, a secondary ammonium ion structure, a tertiary ammonium ion structure, or a quaternary ammonium ion structure. (I2a-DL) compound: one or more compounds selected from the group consisting of alkyl chloride structure-containing compounds, cycloalkyl chloride structure-containing compounds, aryl chloride structure-containing compounds, alkyl bromide structure-containing compounds, cycloalkyl bromide structure-containing compounds, and aryl bromide structure-containing compounds. (I2b-DL) compound: a compound having a chloride ion structure and / or a bromide ion structure as an anion species, and an ammonium ion structure, a primary ammonium ion structure, a secondary ammonium ion structure, a tertiary ammonium ion structure, or a quaternary ammonium ion structure as a cation species.

[0112] This configuration significantly improves the light-emitting characteristics by lowering the driving voltage, improving the light-emitting brightness, and improving the reliability of the light-emitting device. It is believed that the sulfur-containing compound and the chlorine- or bromine-containing compound in the pixel dividing layer, etc., promote surface modification on the light-emitting layer-side surface of the first electrode corresponding to the openings of the pixel dividing layer section or the pixel dimension control layer section. Therefore, it is believed that adjusting the work function difference promotes lower driving voltage for the light-emitting characteristics. As a result, it is believed that the effect of improving the light-emitting brightness when driven at the same voltage is significantly improved. Furthermore, it is believed that the surface of the first electrode is surface-modified by the sulfur, chlorine, or bromine element, and that a dense film is formed by self-organization of substituents on the sulfur, chlorine, or bromine atoms. Therefore, it is believed that the heat resistance and oxidation resistance of the first electrode are improved, thereby significantly improving the reliability of the light-emitting device. The (I1a-DL) compound, the (I1b-DL) compound, the (I2a-DL) compound, and the (I2b-DL) compound may hereinafter be collectively referred to as "(I-DL) compound."

[0113] In such a configuration, from the viewpoints of achieving low-voltage driving of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device, when the pixel dividing layer etc. contains an (I1a-DL) compound, the (I1a-DL) compound includes one or more compounds selected from the group consisting of thiol structure-containing compounds, sulfide structure-containing compounds, disulfide structure-containing compounds, and sulfonic acid structure-containing compounds; when the pixel dividing layer etc. contains an (I1b-DL) compound, the (I1b-DL) compound includes a compound having, as an anion species, one or more compounds selected from the group consisting of a sulfide ion structure, a hydrogen sulfide ion structure, a sulfate ion structure, and a hydrogen sulfate ion structure, and having a quaternary ammonium ion structure as a cation species; when the pixel dividing layer etc. contains an (I2a-DL) compound, the (I2a-DL) compound includes one or more compounds selected from the group consisting of an alkyl chloride structure-containing compound, a cycloalkyl chloride structure-containing compound, an alkyl bromide structure-containing compound, and a cycloalkyl bromide structure-containing compound; When the pixel dividing layer or the like contains an (I2b-DL) compound, the (I2b-DL) compound preferably contains a compound having a chloride ion structure and / or a bromide ion structure as an anion species and a quaternary ammonium ion structure as a cation species.

[0114] This configuration is believed to further promote the surface modification action on the surface of the first electrode facing the light-emitting layer, thereby significantly improving the light-emitting characteristics, lowering the driving voltage, and improving the luminance. Furthermore, it is believed that a denser film is formed on the surface of the first electrode due to the self-organization of substituents on sulfur atoms, chlorine atoms, or bromine atoms, which is believed to significantly improve the reliability of the light-emitting device.

[0115] The pixel dividing layer etc. more preferably contains an (I1a-DL) compound and / or an (I1b-DL) compound. The pixel dividing layer etc. further preferably contains an (I1a-DL) compound and / or an (I1b-DL) compound, and also contains an (I2a-DL) compound and / or an (I2b-DL) compound. The pixel dividing layer etc. also more preferably contains an (I1a-DL) compound and an (I1b-DL) compound. The pixel dividing layer etc. also more preferably contains an (I2a-DL) compound and an (I2b-DL) compound. It is also preferable that each of the (I1a-DL) compound, (I1b-DL) compound, (I2a-DL) compound, and (I2b-DL) compound contains two or more types of compounds.

[0116] From the viewpoints of achieving low-voltage driving of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device, it is preferable that the (I1a-DL) compound and the (I2a-DL) compound have the following (I-Ia) structure, and the (I1b-DL) compound and the (I2b-DL) compound have the following (I-Ib) structure in the pixel dividing layer and the like. (I-Ia) structure: a structure containing one or more groups selected from the group consisting of mono- to divalent aliphatic groups having 4 to 30 carbon atoms, alkylaryl groups having 10 to 30 carbon atoms, arylalkyl groups having 10 to 30 carbon atoms, and aryl groups having 7 to 15 carbon atoms. (I-Ib) structure: a structure containing one or more groups selected from the group consisting of mono- to divalent aliphatic groups having 1 to 6 carbon atoms, alkylaryl groups having 10 to 30 carbon atoms, arylalkyl groups having 10 to 30 carbon atoms, and aryl groups having 7 to 15 carbon atoms.

[0117] This configuration is believed to further promote the surface modification action on the surface of the first electrode facing the light-emitting layer, thereby significantly improving the light-emitting characteristics, lowering the driving voltage, and improving the luminance. Furthermore, it is believed that a denser film is formed on the surface of the first electrode due to the self-organization of substituents on sulfur atoms, chlorine atoms, or bromine atoms, which is believed to significantly improve the reliability of the light-emitting device.

[0118] The (I1a-DL) compound and the (I2a-DL) compound more preferably have the following (II-Ia) structure and / or (III-Ia) structure: (II-Ia) structure: a structure containing one or more groups selected from the group consisting of a monovalent aliphatic group having 4 to 30 carbon atoms, a divalent aliphatic group having 6 to 30 carbon atoms, an alkylaryl group having 10 to 30 carbon atoms, and an alkylaryl group having 10 to 30 carbon atoms; (III-Ia) structure: a structure containing one or more groups selected from the group consisting of an oxyalkylene group having a monovalent aliphatic group having 4 to 30 carbon atoms bonded thereto, an oxyalkylene group having an alkylaryl group having 10 to 30 carbon atoms bonded thereto, an oxyalkylene group having an alkylaryl group having 10 to 30 carbon atoms bonded thereto, and an oxyalkylene group having an aryl group having 7 to 15 carbon atoms bonded thereto.

[0119] The (I1a-DL) compound has a substituent bonded to a sulfur atom, and the substituent preferably has a (I-Ia) structure, and more preferably has a (II-Ia) structure and / or a (III-Ia) structure. The (I2a-DL) compound has a substituent bonded to a chlorine atom or a bromine atom, and the substituent preferably has a (I-Ia) structure, and more preferably has a (II-Ia) structure and / or a (III-Ia) structure.

[0120] The (II-Ia) structure is preferably the following (II-Iax) structure. (II-Iax) structure: a structure containing one or more groups selected from the group consisting of a monovalent aliphatic group having 6 to 12 carbon atoms, a divalent aliphatic group having 6 to 12 carbon atoms, an alkylaryl group having 14 to 26 carbon atoms, and an alkylaryl group having 14 to 26 carbon atoms. The (III-Ia) structure is preferably the following (III-Iax) structure. (III-Iax) structure: a structure containing one or more groups selected from the group consisting of an oxyalkylene group having a monovalent aliphatic group having 6 to 12 carbon atoms bonded thereto, an oxyalkylene group having an alkylaryl group having 14 to 26 carbon atoms bonded thereto, an oxyalkylene group having an alkylaryl group having 14 to 26 carbon atoms bonded thereto, and an oxyalkylene group having an aryl group having 7 to 10 carbon atoms bonded thereto.

[0121] In the (I-Ia) structure, the (II-Ia) structure, and the (III-Ia) structure, the monovalent aliphatic group is preferably an alkyl group, an alkenyl group, or an alkynyl group, more preferably an alkyl group. The divalent aliphatic group is preferably an alkylene group, an alkenylene group, or an alkynylene group, more preferably an alkylene group. Furthermore, the mono- to divalent aliphatic group preferably has a linear or branched structure, more preferably a linear structure.

[0122] The (I1b-DL) compound and the (I2b-DL) compound have a substituent bonded to a nitrogen atom of a cationic species such as the above-mentioned ammonium ion structure, and the substituent preferably has a (I-Ib) structure.

[0123] The (I-Ib) structure is preferably the following (I-Ibx) structure: (I-Ibx) structure: a structure containing one or more groups selected from the group consisting of a monovalent aliphatic group having 1 to 4 carbon atoms, an alkylaryl group having 10 to 26 carbon atoms, an arylalkyl group having 10 to 26 carbon atoms, and an aryl group having 7 to 10 carbon atoms.

[0124] In the (I-Ib) structure, the monovalent aliphatic group is preferably an alkyl group, an alkenyl group, or an alkynyl group, more preferably an alkyl group. The divalent aliphatic group is preferably an alkylene group, an alkenylene group, or an alkynylene group, more preferably an alkylene group. The mono- to divalent aliphatic group preferably has a linear or branched structure, more preferably a linear structure. The mono- to divalent aliphatic group may have, as a substituent, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, a carboxy group, a hydroxy group, or an amino group. In the (I-Ib) structure, the ammonium ion structure or the like is preferably an ammonium ion structure, a primary ammonium ion structure, a secondary ammonium ion structure, a tertiary ammonium ion structure, or a quaternary ammonium ion structure, more preferably a quaternary ammonium ion structure. The quaternary ammonium ion structure preferably has four alkyl groups having 1 to 6 carbon atoms, more preferably four alkyl groups having 1 to 4 carbon atoms. The four alkyl groups are each independently alkyl groups having 1 to 6 carbon atoms, and the number of carbon atoms may be the same or different.

[0125] The display device of the present invention satisfies one or more of the following conditions (1a-DL) and (1b-DL), or one or more of the following conditions (2a-DL) and (2b-DL): (1a-DL) the content of elemental sulfur in the pixel dividing layer is 0.01 to 500 ppm by mass; (1b-DL) the total content of sulfide ions, hydrogen sulfide ions, sulfate ions, and hydrogen sulfate ions in the pixel dividing layer is 0.01 to 1,000 ppm by mass; (2a-DL) the total content of elemental chlorine and elemental bromine in the pixel dividing layer is 0.01 to 500 ppm by mass; and (2b-DL) the total content of elemental chloride ions and bromide ions in the pixel dividing layer is 0.01 to 1,000 ppm by mass.

[0126] In the display device of the present invention, when the pixel dividing layer contains the above (I1a-DL) compound and / or (I1b-DL) compound, it is preferable that one or more of the above conditions (1a-DL) and (1b-DL) are satisfied, and it is more preferable that the above conditions (1a-DL) and (1b-DL) are satisfied. Furthermore, in the display device of the present invention, when the pixel dividing layer contains the above (I2a-DL) compound and / or (I2b-DL) compound, it is preferable that one or more of the above conditions (2a-DL) and (2b-DL) are satisfied, and it is more preferable that the above conditions (2a-DL) and (2b-DL) are satisfied. Furthermore, in the display device of the present invention, when the pixel dividing layer contains the above (I1a-DL) compound and / or (I1b-DL) compound and also contains the above (I2a-DL) compound and / or (I2b-DL) compound, it is more preferable that one or more of the above conditions (1a-DL) and (1b-DL) are satisfied, and one or more of the above conditions (2a-DL) and (2b-DL) are satisfied, and it is even more preferable that the above conditions (1a-DL) and (1b-DL) are satisfied, and the above conditions (2a-DL) and (2b-DL) are satisfied.

[0127] The content of sulfur element in the pixel dividing layer is preferably 0.01 mass ppm or more, more preferably 0.03 mass ppm or more, even more preferably 0.05 mass ppm or more, even more preferably 0.07 mass ppm or more, and particularly preferably 0.1 mass ppm or more. On the other hand, the content of sulfur element is preferably 700 mass ppm or less, more preferably 500 mass ppm or less, and even more preferably 300 mass ppm or less. Furthermore, from the viewpoint of improving the reliability of the light-emitting element, it is preferably 100 mass ppm or less, more preferably 70 mass ppm or less, even more preferably 50 mass ppm or less, even more preferably 30 mass ppm or less, and particularly preferably 10 mass ppm or less. Furthermore, from the viewpoint of low-voltage driving of light-emitting characteristics, improvement of light-emitting brightness, and improvement of the reliability of the light-emitting element, it is preferably 7 mass ppm or less, more preferably 5 mass ppm or less, even more preferably 3 mass ppm or less, and particularly preferably 1 mass ppm or less.

[0128] The total content of chlorine and bromine elements in the pixel dividing layer is preferably 0.01 mass ppm or more, more preferably 0.03 mass ppm or more, even more preferably 0.05 mass ppm or more, even more preferably 0.07 mass ppm or more, and particularly preferably 0.1 mass ppm or more. On the other hand, the total content of chlorine and bromine elements is preferably 700 mass ppm or less, more preferably 500 mass ppm or less, and even more preferably 300 mass ppm or less. Furthermore, from the viewpoint of improving the reliability of the light-emitting element, it is preferably 100 mass ppm or less, more preferably 70 mass ppm or less, even more preferably 50 mass ppm or less, even more preferably 30 mass ppm or less, and particularly preferably 10 mass ppm or less. Furthermore, from the viewpoint of achieving low-voltage driving of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device, the content is preferably 7 ppm by mass or less, more preferably 5 ppm by mass or less, even more preferably 3 ppm by mass or less, and particularly preferably 1 ppm by mass or less.

[0129] The content of sulfur element in the pixel division layer is the total amount of sulfur element in the form of a simple substance, ion, compound, or compound ion. Similarly, the content of chlorine element in the pixel division layer is the total amount of chlorine element in the form of a simple substance, ion, compound, or compound ion. Similarly, the content of bromine element in the pixel division layer is the total amount of bromine element in the form of a simple substance, ion, compound, or compound ion.

[0130] The total content of sulfide ions, hydrogen sulfide ions, sulfate ions, and hydrogen sulfate ions in the pixel dividing layer is preferably 0.01 mass ppm or more, more preferably 0.03 mass ppm or more, even more preferably 0.05 mass ppm or more, even more preferably 0.07 mass ppm or more, and particularly preferably 0.1 mass ppm or more. On the other hand, the total content of sulfide ions, hydrogen sulfide ions, sulfate ions, and hydrogen sulfate ions is preferably 1,000 mass ppm or less, more preferably 700 mass ppm or less, even more preferably 500 mass ppm or less, and particularly preferably 300 mass ppm or less. Furthermore, from the viewpoint of improving the reliability of the light-emitting element, it is preferably 100 mass ppm or less, more preferably 70 mass ppm or less, even more preferably 50 mass ppm or less, even more preferably 30 mass ppm or less, and particularly preferably 10 mass ppm or less. Furthermore, from the viewpoint of achieving low-voltage driving of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device, the content is preferably 7 ppm by mass or less, more preferably 5 ppm by mass or less, even more preferably 3 ppm by mass or less, and particularly preferably 1 ppm by mass or less.

[0131] The total content of chloride ions and bromide ions in the pixel dividing layer is preferably 0.01 mass ppm or more, more preferably 0.03 mass ppm or more, even more preferably 0.05 mass ppm or more, even more preferably 0.07 mass ppm or more, and particularly preferably 0.1 mass ppm or more. On the other hand, the total content of chloride ions and bromide ions is preferably 1,000 mass ppm or less, more preferably 700 mass ppm or less, even more preferably 500 mass ppm or less, and particularly preferably 300 mass ppm or less. Furthermore, from the viewpoint of improving the reliability of the light-emitting element, it is preferably 100 mass ppm or less, more preferably 70 mass ppm or less, even more preferably 50 mass ppm or less, even more preferably 30 mass ppm or less, and particularly preferably 10 mass ppm or less. Furthermore, from the viewpoint of achieving low-voltage driving of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device, the content is preferably 7 ppm by mass or less, more preferably 5 ppm by mass or less, even more preferably 3 ppm by mass or less, and particularly preferably 1 ppm by mass or less.

[0132] The (I1a-DL) compound in the pixel dividing layer etc. is preferably a compound having a structure derived from the (I1a) compound described below. The (I1b-DL) compound in the pixel dividing layer etc. is preferably a compound having a structure derived from the (I1b) compound described below. The (I2a-DL) compound in the pixel dividing layer etc. is preferably a compound having a structure derived from the (I2a) compound described below. The (I2b-DL) compound in the pixel dividing layer etc. is preferably a compound having a structure derived from the (I2b) compound described below.

[0133] The contents of sulfur, chlorine, and bromine in the pixel dividing layer can be measured by combustion ion chromatography, for example, by burning and decomposing the photosensitive composition in a combustion tube of an analyzer, absorbing the generated gas into an absorption liquid, and then analyzing a portion of the absorption liquid by ion chromatography.

[0134] The content of sulfide ions, hydrogen sulfide ions, sulfate ions, hydrogen sulfate ions, chloride ions, and bromide ions in the pixel division layer can be measured by ion chromatography. For example, the pixel division layer is first scraped off, and the scraped off pixel division layer is added to a 10 mmol / L potassium hydroxide aqueous solution and shaken for 2 hours to extract ionic components. The extract is then filtered, and the anionic components are analyzed by ion chromatography to measure the content.

[0135] In the display device of the present invention, it is preferred that the pixel dividing layer contains a (C1-DL) compound and / or a (C2-DL) compound, and the pixel dimension control layer and the spacer layer contain a (C1-DL) compound different from the (C1-DL) compound in the pixel dividing layer, and / or a (C2-DL) compound different from the (C2-DL) compound in the pixel dividing layer; and it is more preferred that the pixel dividing layer contains a (C1x-DL) compound and / or a (C2x-DL) compound, and the pixel dimension control layer and the spacer layer contain a (C1x-DL) compound different from the (C1x-DL) compound in the pixel dividing layer, and / or a (C2x-DL) compound different from the (C2x-DL) compound in the pixel dividing layer.

[0136] <Maximum Surface Roughness on the Surfaces of the Pixel Division Layer and the Spacer Layer> In the display device of the present invention, the pixel division layer includes a cured pattern having a stepped shape as described below. In the stepped shape of the cured pattern of the pixel division layer, the maximum surface roughness on the surface of the thin film portion of the pixel division layer is preferably 0.1 to 50.0 nm. Meanwhile, in the stepped shape of the cured pattern of the pixel division layer, the maximum surface roughness on the surface of the thick film portion of the pixel division layer is preferably 0.1 to 50.0 nm. This configuration significantly improves adhesion between the pixel division layer and the second electrode, reduces the driving voltage for light-emitting characteristics, improves light-emitting brightness, and improves the reliability of the light-emitting element. From the viewpoint of improving adhesion between the pixel division layer and the second electrode, the maximum surface roughness on the surface of the pixel division layer is preferably 0.1 nm or more, more preferably 0.3 nm or more, even more preferably 0.5 nm or more, even more preferably 0.7 nm or more, and particularly preferably 1.0 nm or more. The maximum surface roughness of the surface of the pixel division layer is preferably 3.0 nm or more, more preferably 5.0 nm or more, even more preferably 7.0 nm or more, and particularly preferably 10.0 nm or more, from the viewpoint of suppressing external light reflection. On the other hand, the maximum surface roughness of the surface of the pixel division layer is preferably 50.0 nm or less, more preferably 40.0 nm or less, even more preferably 30.0 nm or less, and particularly preferably 20.0 nm or less, from the viewpoint of low-voltage driving of light-emitting characteristics, improved light-emitting brightness, and improved reliability of the light-emitting element. It is preferable that the arithmetic mean roughness of the surface of the thick film portion of the pixel division layer is 1.0 nm or more. It is also preferable that the maximum surface roughness of the surface of the thick film portion of the pixel division layer is 1.0 nm or more.

[0137] In the display device of the present invention, the pixel division layer preferably contacts the second electrode above. However, insufficient adhesion between the pixel division layer and the second electrode is likely to cause interfacial peeling, which may result in reduced panel yield and reduced reliability of the light-emitting element. In particular, when the display device of the present invention is a flexible display device, insufficient adhesion between the pixel division layer and the second electrode can cause interfacial peeling. As described above, when the display device of the present invention is a flexible display device, it is preferable that the pixel division layer be laminated on a flexible substrate. However, it is believed that stress generated at the interface between the pixel division layer and the second electrode due to movement of the flexible substrate can cause interfacial peeling. When the maximum surface roughness of the surface of the pixel division layer is within the above-described range, the effect of improving the adhesion between the pixel division layer and the second electrode is significant.

[0138] As described above, in the display device of the present invention, the pixel division layer is preferably a cured film obtained by curing a photosensitive composition. After forming the pixel division layer section, the surface of the first electrode is typically cleaned by plasma treatment or the like to decompose and remove any small amounts of residue remaining on the surface of the first electrode at the openings of the pixel division layer section or the pixel dimension control layer section. However, if the plasma treatment is performed with increased power or for a longer period of time to decompose and remove the residue on the surface of the first electrode, the surface of the pixel division layer is also decomposed and removed. Therefore, low-molecular-weight components remaining on the surface of the pixel division layer after plasma treatment or decomposed or altered portions of the surface of the pixel division layer may cause a decrease in the reliability of the light-emitting device. The degree of decomposition and alteration of the surface of the pixel division layer due to plasma treatment can be determined by measuring the maximum surface roughness of the surface of the pixel division layer. A larger maximum surface roughness of the surface of the pixel division layer indicates a greater degree of decomposition and alteration of the surface of the pixel division layer. When the maximum value of the surface roughness of the surface of the pixel division layer is within the above-mentioned range, the effects of lowering the voltage required for light-emitting characteristics, improving the light-emitting brightness, and improving the reliability of the light-emitting element are significant.

[0139] In the display device of the present invention, by setting the maximum surface roughness of the surface of the pixel division layer within the above-mentioned range and increasing the diffusely reflected light on the surface of the pixel division layer, the effect of suppressing external light reflection becomes significant. Generally, when external light is incident, two types of reflected light are generated on the surface: specularly reflected light and diffusely reflected light. The sum of these forms constitutes the reflected light, but specularly reflected light has a large impact on visibility in terms of glare and glare. Therefore, it is believed that increasing the diffusely reflected light and reducing the specularly reflected light is effective in suppressing external light reflection. Therefore, it is estimated that by setting the maximum surface roughness of the surface of the pixel division layer within the above-mentioned range, the effect of suppressing external light reflection becomes significant.

[0140] In the display device of the present invention, when the pixel division layer includes a cured pattern having a step shape, the maximum value of the surface roughness of the surface of the thin film portion of the pixel division layer (Ra ＨＴ／ｍａｘ ), and the maximum value of the surface roughness on the surface of the thick film part of the pixel division layer is (Ra ＦＴ／ｍａｘ ) and (Ra ＨＴ／ｍａｘ ) and (Ra ＦＴ／ｍａｘ ) and the difference |Δ(Ra ＨＴ／ｍａｘ -Ra ＦＴ／ｍａｘ )| is preferably 1.0 to 50.0 nm.

[0141] The maximum value of the surface roughness of the thin film portion of the pixel division layer is (Ra ＨＴ／ｍａｘ ), and the maximum value of the surface roughness on the surface of the thick film part of the pixel division layer is (Ra ＦＴ／ｍａｘ ) and (Ra ＨＴ／ｍａｘ ) and (Ra ＦＴ／ｍａｘ ) and the difference |Δ(Ra ＨＴ／ｍａｘ -Ra ＦＴ／ｍａｘ )| is preferably 0.1 to 50.0 nm. ＨＴ／ｍａｘ ) and (Ra ＦＴ／ｍａｘ ) and the difference |Δ(Ra ＨＴ／ｍａｘ -Ra ＦＴ／ｍａｘ From the viewpoint of improving the adhesion between the pixel dividing layer and the second electrode and suppressing the reflection of external light, (Ra)| is preferably 1.0 nm or more, more preferably 3.0 nm or more, even more preferably 5.0 nm or more, still more preferably 7.0 nm or more, and particularly preferably 10.0 nm or more. ＨＴ／ｍａｘ ) and (Ra ＦＴ／ｍａｘ ) and the difference |Δ(RaＨＴ／ｍａｘ -Ra ＦＴ／ｍａｘ )| is preferably 50.0 nm or less, more preferably 40.0 nm or less, even more preferably 30.0 nm or less, and particularly preferably 20.0 nm or less, from the viewpoints of achieving low-voltage driving of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device.

[0142] In the display device of the present invention, when the pixel division layer has a cured pattern and a spacer layer is provided on a part of the pixel division layer, the maximum value of the surface roughness of the surface of the pixel division layer is (Ra ＤＬ／ｍａｘ ), and the maximum value of the surface roughness on the surface of the spacer layer is (Ra ＳＰ／ｍａｘ ) and (Ra ＤＬ／ｍａｘ ) and (Ra ＳＰ／ｍａｘ ) |Δ(Ra ＤＬ／ｍａｘ -Ra ＳＰ／ｍａｘ )| is preferably 1.0 to 50.0 nm. With such a configuration, the effects of improving the adhesion between the pixel dividing layer and the second electrode, suppressing the reflection of external light, lowering the driving voltage for light-emitting characteristics, improving the light-emitting brightness, and improving the reliability of the light-emitting element are remarkable.

[0143] The maximum value of the surface roughness on the surface of the pixel division layer is (Ra ＤＬ／ｍａｘ ), and the maximum value of the surface roughness on the surface of the spacer layer is (Ra ＳＰ／ｍａｘ ) and (Ra ＤＬ／ｍａｘ ) and (Ra ＳＰ／ｍａｘ ) |Δ(Ra ＤＬ／ｍａｘ -Ra ＳＰ／ｍａｘ )| is preferably 0.1 to 50.0 nm. ＤＬ／ｍａｘ ) and (Ra ＳＰ／ｍａｘ ) |Δ(Ra ＤＬ／ｍａｘ -Ra ＳＰ／ｍａｘ )| is described above. ＨＴ／ｍａｘ ) and (Ra ＦＴ／ｍａｘ ) |Δ(Ra ＨＴ／ｍａｘ -Ra ＦＴ／ｍａｘ )| is as described in the examples and preferred embodiments.

[0144] In the display device of the present invention, the arithmetic mean roughness and maximum surface roughness values ​​can be measured using an atomic force microscope (hereinafter referred to as "AFM"). Generally, AFM measurements are performed from vertically above the surface of a pixel division layer or the like of a display device placed on a horizontal surface. In the display device of the present invention, the arithmetic mean roughness and maximum surface roughness values ​​refer to values ​​measured on a surface of the pixel division layer or the like that can be measured by AFM, i.e., a surface approximately parallel to the substrate.

[0145] <Optical Density of Pixel Division Layer, Pixel Dimension Control Layer, and Spacer Layer; Flexible Display Device> In the display device of the present invention, the pixel division layer has an optical density of 0.5 to 3.0 at wavelengths of visible light per 1 μm of film thickness. This configuration allows the pixel division layer to block incident external light, resulting in a significant effect of suppressing external light reflection. Furthermore, improved light-blocking properties of the pixel division layer at wavelengths of visible light and ultraviolet light suppress outgassing from the pixel division layer and other components, thereby suppressing deterioration of the light-emitting elements, resulting in a significant effect of improving the reliability of the light-emitting elements. The pixel division layer is preferably black. From the viewpoint of suppressing external light reflection and improving the reliability of the light-emitting elements, the optical density of the pixel division layer at wavelengths of visible light per 1 μm of film thickness is preferably 0.7 or more, more preferably 1.0 or more, even more preferably 1.2 or more, and particularly preferably 1.5 or more. On the other hand, the optical density at the wavelength of visible light per 1 μm of film thickness of the pixel division layer is preferably 2.7 or less, more preferably 2.5 or less, even more preferably 2.2 or less, and particularly preferably 2.0 or less, from the viewpoints of achieving low-voltage operation of the light-emitting characteristics, improving the light-emitting brightness, and improving the reliability of the light-emitting device. Here, the optical density refers to the optical density of a cured product obtained by heating the photosensitive composition at 250°C for 60 minutes. The thermal curing conditions are to heat the material to 250°C at a heating rate of 3.5°C / min in a nitrogen atmosphere with an oxygen concentration of 20 ppm by mass or less, heat treatment at 250°C for 60 minutes, and then cool to 50°C. When the photosensitive composition contains a dye or a thermal color former, or when the photosensitive composition has positive photosensitivity, the thermal curing conditions were as follows: in a nitrogen atmosphere with an oxygen concentration of 20 ppm by mass or less, the composition was heated to 200°C at a heating rate of 3.5°C / min, heat-treated at 200°C for 60 minutes, and then cooled to 50°C. When the photosensitive composition contains an oxidative color former, the thermal curing conditions were as follows: in an air atmosphere, the composition was heated to 200°C at a heating rate of 3.5°C / min, heat-treated at 200°C for 60 minutes, and then cooled to 50°C. These thermal curing conditions are common throughout this specification unless otherwise specified.

[0146] In the display device of the present invention, it is also preferable that the optical density at the wavelength of visible light per 1 μm of film thickness of the pixel dimension control layer and / or spacer layer is 0.5 to 3.0. With this configuration, incident external light can be blocked by the pixel dimension control layer or spacer layer, resulting in a significant effect of suppressing external light reflection. Furthermore, the improved light-blocking properties of these layers at visible light wavelengths and ultraviolet wavelengths suppress outgassing from these layers, etc., and thus suppress deterioration of the light-emitting element, resulting in a significant effect of improving the reliability of the light-emitting element. It is preferable that the pixel dimension control layer and / or spacer layer are black. Examples and preferred descriptions of the optical density at the wavelength of visible light per 1 μm of film thickness of the pixel dimension control layer and spacer layer are the same as the examples and preferred descriptions of the optical density of the pixel dividing layer described above.

[0147] In a structure in which at least two layers among the pixel dividing layer, pixel dimension control layer, and spacer layer are stacked, the optical density of each layer can be determined by the following method. First, the optical density (OD ＴＯＴＡＬ Next, the optical density and the film thickness of the pixel division layer are measured at a portion where no layer structure is formed, for example, at a portion where only the pixel division layer is present. From the obtained values, for example, the optical density per 1 μm of film thickness of the pixel division layer (OD ＰＤＬ The optical density (OD) of the laminated structure is then calculated. ＴＯＴＡＬ ) and the film thickness of each layer, and the optical density (OD ＰＤＬ ) and the optical density of the pixel dimension control layer or the spacer layer, for example, is calculated from the difference in optical density.

[0148] The display device of the present invention preferably does not have a linear polarizer, a quarter-wave plate, or a circular polarizer on the light extraction side of the organic layer including the light-emitting layer. By adopting such a configuration, the display device of the present invention does not have a polarizing film that is poor in flexibility and bendability, and therefore has significant effects of improving flexibility and bendability.

[0149] The display device of the present invention preferably further has a flexible substrate, has a structure in which a pixel dividing layer is laminated on the flexible substrate, does not have a linear polarizer, a quarter-wave plate, or a circular polarizer on the light extraction side of the organic layer including the light-emitting layer, has a curved display section, a display section including a surface bent outward, or a display section including a surface bent inward, and is a flexible display device.

[0150] With this configuration, the display device of the present invention significantly prevents the electrode wiring from becoming visible and suppresses external light reflection due to the light-blocking properties of the pixel division layer, even without a polarizing film such as a linear polarizer, a quarter-wave plate, or a circular polarizer on the light extraction side of the organic layer containing the light-emitting layer. That is, the display device of the present invention significantly improves flexibility and foldability by not including a polarizing film, which has poor flexibility and bendability. Therefore, the display device of the present invention is suitable for flexible display devices having a structure in which the pixel division layer is laminated on a flexible substrate and does not include a polarizing film on the light extraction side of the organic layer containing the light-emitting layer, and is particularly suitable for flexible organic EL displays. Furthermore, the absence of a polarizing film significantly reduces the cost of manufacturing the display device. Figure 6 shows a schematic cross-sectional view of an example of a display device including a pixel division layer with a stepped shape and a polarizing film.

[0151] The display device of the present invention preferably has a structure in which the pixel dimension control layer and / or the spacer layer are laminated on a flexible substrate. With this configuration, the display device of the present invention can achieve significant effects of preventing visualization of electrode wiring and suppressing external light reflection due to the light-blocking properties of the pixel dimension control layer or the spacer layer, even if the display device does not have a polarizing film such as a linear polarizer, a quarter-wave plate, or a circular polarizer on the light extraction side of the organic layer including the light-emitting layer.

[0152] The display device of the present invention preferably further includes one or more polarizers selected from the group consisting of a linear polarizer, a quarter-wave plate, and a circular polarizer on the light extraction side of the organic layer including the light-emitting layer. With this configuration, the light-blocking properties of the pixel division layer and the polarizing film significantly prevent the electrode wiring from becoming visible and suppress external light reflection. Furthermore, when the display device of the present invention includes a pixel dimension control layer and / or a spacer layer, the light-blocking properties of these layers and the polarizing film significantly prevent the electrode wiring from becoming visible and suppress external light reflection. Therefore, the display device of the present invention is particularly suitable for display devices that require excellent external light reflection suppression, and is particularly suitable for organic EL displays that require excellent external light reflection suppression.

[0153] <Step-shaped cured pattern of pixel division layer> In the display device of the present invention, the pixel division layer includes a step-shaped cured pattern, and the thickness of the thick film portion in the step shape of the cured pattern of the pixel division layer is set to (T ＦＴ ) μm, and the film thickness of the thin film portion is (T ＨＴ ) μm, (T ＦＴ ) μm and (T ＨＴ ) μm and the film thickness difference (ΔT ＦＴ－ＨＴ ) μm is preferably 0.5 to 10.0 μm.

[0154] This configuration significantly reduces the voltage required for light-emitting characteristics, improves light-emitting brightness, and enhances the reliability of light-emitting devices. The pixel division layer includes a step-shaped curing pattern with a thickness difference of 0.5 μm or more, thereby reducing the contact area between the pixel division layer and a vapor deposition mask when forming an organic layer containing a light-emitting layer. Therefore, suppressing damage to the pixel division layer significantly reduces panel yield reductions and improves the reliability of light-emitting devices. Common methods for forming a pixel division layer with a step shape include (1) a method of simultaneously processing the step shape using a halftone photomask, and (2) a method of forming a two-layer pixel division layer. In method (1), the area near the opening of the pixel division layer is a thin-film portion of the step shape of the pixel division layer. Therefore, the pixel division layer is designed to have higher alkali solubility than the thick-film portion. Therefore, it is estimated that residue generation at the opening of the pixel division layer is suppressed, resulting in significant reductions in the voltage required for light-emitting characteristics and enhanced light-emitting brightness. On the other hand, in the case of method (2), the vicinity of the opening of the pixel division layer is the thin film portion of the stepped shape of the pixel division layer, which is the first layer. Therefore, when forming the second layer, which is the thick film portion, the opening of the first layer will again come into contact with the alkaline developer. Therefore, it is estimated that the generation of residues at the opening of the pixel division layer is suppressed, and the effects of lowering the driving voltage of the light-emitting characteristics and improving the light-emitting brightness are significant. When the stepped shape is processed in one step using a halftone photomask, in addition to the above effects, the effects of shortening the process time and improving productivity are also significant.

[0155] 8 is a schematic cross-sectional view showing an example of a cross-section of a step-shaped cured pattern of a pixel dividing layer in a display device of the present invention. The thick film portion 34 in the step shape corresponds to the cured portion at the time of exposure in the case of a negative type and to the unexposed portion at the time of exposure in the case of a positive type, and has the maximum film thickness of the cured pattern. The thin film portions 35a, 35b, and 35c in the step shape correspond to the half-tone exposed portion at the time of exposure, and have a film thickness smaller than that of the thick film portion 34. The taper angles θ of the inclined sides 36a, 36b, 36c, 36d, and 36e in the cross-section of the step-shaped cured pattern are ａ , θ ｂ , θ ｃ , θ ｄ , θ ｅIn this case, the taper angle θ is preferably a forward taper, and more preferably a shallow taper. ａ , θ ｂ , θ ｃ , θ ｄ , θ ｅ As shown in Figure 8, the term "rectangular" refers to an angle within the cross section of a cured pattern having a stepped shape, formed by a horizontal edge 37 of the underlying substrate on which the cured pattern is formed, or a horizontal edge of thin film portions 35a, 35b, and 35c, and inclined edges 36a, 36b, 36c, 36d, and 36e in the cross section of the cured pattern having a stepped shape that intersects with the horizontal edges of thin film portions 35a, 35b, and 35c. Here, "forward taper" refers to a taper angle that is greater than 0° and less than 90°, and "reverse taper" refers to a taper angle that is greater than 90° and less than 180°. Furthermore, "rectangular" refers to a taper angle of 90°, and "low taper" refers to a taper angle that is greater than 0° and less than 60°.

[0156] In the display device of the present invention, the region having the greatest thickness between the plane of the lower surface (on the horizontal side 37 side of the underlying substrate) and the plane of the upper surface of the step-shaped cured pattern of the pixel dividing layer is called the thick film portion 34, and the regions having a thickness smaller than that of the thick film portion are called the thin film portions 35a, 35b, and 35c. The film thickness of the thick film portion 34 is (T ＦＴ ) μm, and the film thickness of the thin film portions 35 a, 35 b, and 35 c arranged on the thick film portion 34 via at least one step shape is (T ＨＴ ) μm, (T ＦＴ ) μm and (T ＨＴ ) μm and the film thickness difference (ΔT ＦＴ－ＨＴ ) μm are each preferably 0.5 μm or more, more preferably 1.0 μm or more, even more preferably 1.5 μm or more, even more preferably 2.0 μm or more, particularly preferably 2.5 μm or more, and most preferably 3.0 μm or more. All are preferably 0.5 μm or more, more preferably 1.0 μm or more, even more preferably 1.5 μm or more, even more preferably 2.0 μm or more, particularly preferably 2.5 μm or more, and most preferably 3.0 μm or more. ＦＴ ) μm and the film thickness of the thin film portion 35a or 35b (T ＨＴ) μm and the film thickness difference (ΔT ＦＴ－ＨＴ ) μm is more preferably in the above range, and (T ＦＴ ) μm and the film thickness of the thin film portion 35a (T ＨＴ ) μm and the film thickness difference (ΔT ＦＴ－ＨＴ ) μm is more preferably in the above range. ＦＴ ) μm and (T ＨＴ ) μm and the film thickness difference (ΔT ＦＴ－ＨＴ ) μm is preferably 10.0 μm or less, more preferably 9.5 μm or less, even more preferably 9.0 μm or less, even more preferably 8.5 μm or less, and particularly preferably 8.0 μm or less.

[0157] The display device of the present invention preferably satisfies all of the relationships expressed by the formulas (α) to (γ), and more preferably satisfies all of the relationships expressed by the formulas (δ) to (ζ). ＦＴ )≦10.0 (α) 0.20≦(T ＨＴ )≦7.5 (β) 0.10×(T ＦＴ ) ≦ (T ＨＴ ) ≦ 0.75 × (T ＦＴ ) (γ) 2.0≦(T ＦＴ )≦10.0 (δ) 0.30≦(T ＨＴ )≦7.0 (ε) 0.15×(T ＦＴ ) ≦ (T ＨＴ ) ≦ 0.70 × (T ＦＴ ) (ζ).

[0158] This configuration significantly reduces the yield of the panel and improves the reliability of the light-emitting elements. In addition to the above effects, when the step shape is processed in one step using a half-tone photomask, the effects of shortening the process time and improving productivity are also significant.

[0159] In the display device of the present invention, the thick and thin film portions in the stepped shape of the cured pattern of the pixel dividing layer preferably contain the same (D-DL) colorant. Furthermore, it is more preferable that the thick and thin film portions contain the same (C1-DL) compound and / or the same (C2-DL) compound. This configuration significantly improves the light-emitting characteristics by lowering the driving voltage, improving the light-emitting brightness, and improving the reliability of the light-emitting element.

[0160] In the display device of the present invention, the pixel division layer includes a cured pattern having a step shape, and the thickness of the thick film portion in the step shape of the cured pattern of the pixel division layer is (T ＦＴ ) μm, and the film thickness of the thin film portion is (T ＨＴ ) μm, (T ＦＴ ) μm and (T ＨＴ ) μm and the film thickness difference (ΔT ＦＴ－ＨＴ In the display device of the present invention, when the (C1-DL) compound and / or the (C2-DL) compound are the same, the thick and thin film portions in the stepped shape of the cured pattern of the pixel dividing layer preferably contain the same (D-DL) colorant, and the optical density per μm of film thickness of the thick and thin film portions at the wavelength of visible light is preferably 0.5 to 3.0.

[0161] This configuration significantly reduces the driving voltage for light-emitting characteristics, improves the luminance, and improves the reliability of light-emitting elements. Because the thick and thin portions of the stepped pixel division layer contain the same colorant, have the same optical density range, and contain the same photosensitive agent, the stepped pixel division layer is formed by a method of simultaneously processing the stepped shape using a single photosensitive composition and a halftone photomask. Therefore, as described above, the thin portions are designed to have higher alkali solubility than the thick portions, which presumably suppresses the generation of residues at the openings of the pixel division layer, resulting in significant effects of reducing the driving voltage for light-emitting characteristics and improving the luminance. In addition to the above effects, the effects of shortening process time and improving productivity are also significant. Furthermore, because the stepped pixel division layer has a significant damage suppression effect, the effects of suppressing a decrease in panel yield and improving the reliability of light-emitting elements are significant. The same (C1-DL) compound is preferably the same (C1x-DL) compound described above. The same (C2-DL) compound is preferably the same (C2x-DL) compound described above. FIG. 1 shows a schematic cross-sectional view and a plan view illustrating an example of a display device including a pixel division layer having a stepped shape.

[0162] <Spacer Layer on Pixel Division Layer> In the display device of the present invention, the pixel division layer has a cured pattern, and a spacer layer is provided on a part of the pixel division layer. ＳＰ ) μm is preferably 0.5 to 10.0 μm.

[0163] By adopting such a configuration, a spacer layer having a sufficient height can be formed by photolithography. The presence of the spacer layer significantly reduces damage to the pixel division layer, thereby suppressing a decrease in panel yield and improving the reliability of the light-emitting elements. A schematic cross-sectional view and a plan view showing an example of a display device including a pixel division layer and a spacer layer are shown in FIG. 2.

[0164] In the display device of the present invention, the thickness of the spacer layer (T ＳＰ ) μm is preferably 0.5 μm or more, more preferably 1.0 μm or more, even more preferably 1.5 μm or more, still more preferably 2.0 μm or more, particularly preferably 2.5 μm or more, and most preferably 3.0 μm or more. ＳＰ ) μm is preferably 10.0 μm or less, more preferably 9.5 μm or less, even more preferably 9.0 μm or less, even more preferably 8.5 μm or less, and particularly preferably 8.0 μm or less.

[0165] In the display device of the present invention, the pixel division layer has a cured pattern, and a spacer layer is provided on a part of the pixel division layer, and the thickness of the spacer layer (T ＳＰ ) μm is 0.5 to 10.0 μm, and the spacer layer preferably satisfies at least one of the following conditions (1) to (3), more preferably at least one of the following conditions (1) and (3), and even more preferably at least the following condition (1): (1) the spacer layer does not contain a (D-DL) colorant (2) the spacer layer contains a (D-DL) colorant, and the optical density at the wavelength of visible light per μm of film thickness of the spacer layer is 0.0 to 0.3 (3) the spacer layer contains a compound having a carboxylic acid ester structure containing a (C2x-DL)indene structure and / or a sulfonic acid aryl ester structure containing an indene structure.

[0166] In the display device of the present invention, it is preferable that the spacer layer does not contain a (D-DL) colorant. By not containing a (D-DL) colorant, a spacer layer having sufficient height can be formed, and damage to the pixel dividing layer is suppressed, thereby significantly suppressing a decrease in panel yield and improving the reliability of the light-emitting elements.

[0167] <Organic layer including a light-emitting layer; organic layer portion including a light-emitting layer and pixel portion in plan view> The display device of the present invention has an organic layer including a light-emitting layer. The organic layer including a light-emitting layer preferably has an organic EL layer including a light-emitting layer and / or a light-extraction layer including a light-emitting layer. The organic layer including a light-emitting layer preferably has a laminated structure formed on the first electrode and between the first electrode and the second electrode. This configuration makes it possible to form a region corresponding to the pixel portion described later. The region corresponding to the pixel portion described later corresponds to the region where the organic layer including the light-emitting layer contacts the first electrode described above.

[0168] The organic EL layer preferably further includes a hole transport layer and / or an electron transport layer, and is preferably formed so as to have a laminated structure with the light emitting layer.

[0169] The display device of the present invention can be manufactured as an organic EL display by using a laminated structure that includes an organic EL layer including a light-emitting layer, while the display device of the present invention can be manufactured as a quantum dot display or a micro LED display by using a laminated structure that includes a light-extraction layer including a light-emitting layer.

[0170] The display device of the present invention is also preferably a quantum dot display in which a light extraction layer including a light-emitting layer contains quantum dots. The quantum dot display is a display device having a substrate on which a first electrode, a second electrode, a pixel dividing layer, and a light extraction layer including a light-emitting layer, the pixel dividing layer being formed so as to overlap a portion of the first electrode, the light extraction layer including the light-emitting layer being formed on the first electrode and between the first electrode and the second electrode, and the light extraction layer including the light-emitting layer containing quantum dots.

[0171] The display device of the present invention is also preferably a micro LED display having a light extraction layer including a light-emitting layer containing an inorganic semiconductor. The micro LED display is a display device having a substrate on which a first electrode, a second electrode, a pixel dividing layer, and a light extraction layer including a light-emitting layer, the pixel dividing layer being formed so as to overlap a portion of the first electrode, the light extraction layer including the light-emitting layer being formed on the first electrode and between the first electrode and the second electrode, and the light extraction layer including the light-emitting layer containing the inorganic semiconductor.

[0172] The display device of the present invention can also be manufactured as a display device having a stacked structure using both an organic EL layer including a light-emitting layer and a light-extraction layer including a light-emitting layer. Examples include the following display devices (1) and (2). (1) A display device having a light-emitting element on a first electrode, which uses both an organic EL layer including a light-emitting layer and a light-extraction layer including a light-emitting layer (e.g., a layer including self-luminous quantum dots) as light sources. (2) A display device having a light-emitting element that emits light that has been color-converted from light emitted from a light-emitting element (organic EL light-emitting element) on a first electrode, which uses an organic EL layer including a light-emitting layer as a light source, by a light-extraction layer including a light-emitting layer (e.g., a layer including quantum dots) on the organic EL layer including a light-emitting layer.

[0173] From the viewpoints of achieving low-voltage operation of light-emitting characteristics, improving light emission brightness, and improving light emission color purity, the display device of the present invention preferably has an organic EL layer including an emitting layer and a light extraction layer including an emitting layer. In the display device of the present invention, it is preferable that the light extraction layer including the emitting layer contains quantum dots, and it is preferable that the organic EL layer including the emitting layer and the light extraction layer including the emitting layer are formed on the first electrode in this order.

[0174] On the other hand, the display device of the present invention can also be manufactured as a laminated structure using both an organic EL layer including an emitting layer and a light extraction layer including an emitting layer, with the light extraction layer including an emitting layer located at a position other than on the first electrode. Examples include the following display devices (3) to (5). (3) A display device using, as its light source, both light emission 1 from a light-emitting element (organic EL light-emitting element) on the first electrode, which uses an organic EL layer including an emitting layer as a light source, and light 2 obtained by color-converting light from a backlight such as an LED using a light extraction layer (e.g., a layer including quantum dots) including an emitting layer located not on the first electrode. (4) A display device using, as its light source, light emission from a light-emitting element (organic EL light-emitting element) on the first electrode, which uses an organic EL layer including an emitting layer as a light source, which is color-converted by a light extraction layer (e.g., a layer including quantum dots) including an emitting layer located not on the first electrode. (5) A display device using, as light sources, both light emission 1 from a light-emitting element (organic EL light-emitting element) on a first electrode, which uses an organic EL layer including an emitting layer as a light source, and light 2 obtained by color-converting the light emission from the light-emitting element (organic EL light-emitting element) on the first electrode, which uses an organic EL layer including an emitting layer as a light source, by a light-extraction layer (for example, a layer including quantum dots) including an emitting layer located at a position other than the first electrode.

[0175] From the viewpoints of achieving low-voltage driving of light-emitting characteristics, improving light emission brightness, and improving light emission color purity, the display device of the present invention preferably further includes a color filter containing quantum dots. When a stacked structure including a color filter containing quantum dots is used, the light-emitting element that overlaps with the color filter containing quantum dots and is located below the color filter containing quantum dots in a planar view is preferably an organic EL light-emitting element that emits blue light, an organic EL light-emitting element that emits white light, an LED element that emits blue light, or an LED element that emits white light.

[0176] The display device of the present invention preferably has an organic layer portion including a light-emitting layer in a planar view. The organic layer portion including the light-emitting layer is the organic layer portion including the light-emitting layer as seen in a planar view. The display device of the present invention has a plurality of pixel portions in a planar view. In the display device of the present invention, the pixel portion is preferably a location in the opening of the pixel dividing layer portion or the opening of the pixel dimension control layer portion where the organic layer portion including the light-emitting layer is formed on the first electrode portion as seen in a planar view. The region corresponding to the pixel portion corresponds to a region where the organic layer portion including the light-emitting layer is in contact with the first electrode portion as seen in a planar view. In the display device of the present invention, the pixel portion preferably overlaps with the openings of the color filter layer portion and the black matrix layer portion as seen in a planar view.

[0177] <Sealing Layer> The display device of the present invention preferably has a sealing layer. The sealing layer is a layer that seals a laminated structure having an organic layer including an emitting layer to isolate it from the outside world and suppress the intrusion of moisture, gas, etc. The sealing layer is preferably a cured film obtained by curing a non-photosensitive composition or a photosensitive composition. The sealing layer is also preferably an inorganic layer containing a metal element or silicon. The sealing layer is preferably formed so as to overlap the display region of the display device, such as the first electrode, the second electrode, the opening of the pixel dividing layer portion or the opening of the pixel dimension control layer portion, the organic layer including the emitting layer, and the pixel portion, and is preferably formed so as to seal the display region of the display device. This configuration can isolate the display region of the display device from the outside world and suppress deterioration of the light-emitting element due to the intrusion of moisture, gas, etc., thereby significantly improving the reliability of the light-emitting element. It is more preferable that the sealing layer has a structure that suppresses the intrusion of moisture and oxygen.

[0178] When the sealing layer is a cured film obtained by curing a non-photosensitive composition or a photosensitive composition, it is preferable that the water vapor permeability and gas permeability are reduced by a component such as a resin in the composition, and more preferably that the water vapor permeability and gas permeability are reduced by a crosslinked structure due to a photoreaction and / or a crosslinked structure due to a thermal reaction. When the sealing layer is an inorganic layer containing a metal element or silicon, from the viewpoint of reducing the water vapor permeability and gas permeability, silicon oxide, silicon nitride, or silicon oxynitride is preferred, and silicon dioxide, trisilicon tetranitride, or silicon oxynitride is more preferred.

[0179] <Color filter layer; color filter layer portion in plan view> The display device of the present invention preferably has a color filter layer. The color filter layer is a layer located on the light extraction side and adjusting the emission spectrum. The color filter layer is preferably located on the light extraction side, separated from the pixel division layer and pixel portion, and adjusting the emission spectrum of light emitted from the pixel portion. The color filter layer is preferably a cured film obtained by curing a photosensitive composition, and more preferably a cured film obtained by curing a photosensitive composition containing a colorant. The color filter layer is preferably formed so as to overlap at least a portion of the pixel portion described above. This configuration significantly reduces external light reflection, reduces the voltage required for driving the light-emitting characteristics, improves the luminance of emitted light, and improves the purity of the emitted light color.

[0180] The color filter layer is preferably colored at visible light wavelengths by a component such as a resin in the photosensitive composition, and more preferably colored by a thermal color former and / or an oxidative color former in addition to the component such as a resin. Colored refers to red, orange, yellow, green, blue, or purple. The color filter layer preferably contains a color pigment and / or a color dye, and more preferably contains a color pigment and a color dye.

[0181] The display device of the present invention preferably has a plurality of color filter layer portions in a planar view. The color filter layer portion corresponds to the above-described color filter layer in a planar view. From the viewpoints of suppressing external light reflection, achieving low-voltage driving of light-emitting characteristics, and improving light-emitting brightness, the shape of the color filter layer portion is preferably a closed polygon or a closed polygon with at least some of its sides and / or vertices replaced with arcs. By changing the shape of the color filter layer portion from a perfect circle by at least some straight lines, light emitted from the light-emitting element becomes asymmetric as surface emission, and is strengthened by interference of light emitted from the color filter layer portion, thereby presumably achieving significant effects of low-voltage driving of light-emitting characteristics and improving light-emitting brightness. Furthermore, by changing the shape of the color filter layer portion from a perfect circle by at least some straight lines, scattering of external light incident from the color filter layer portion on the surface of the pixel division layer portion becomes asymmetric, and the light is weakened by reflection and interference between the first electrode and the second electrode, thereby presumably achieving significant effects of suppressing external light reflection.

[0182] <Black Matrix Layer; Black Matrix Layer Portion in Plan View> The display device of the present invention preferably has a black matrix layer. The black matrix layer is a layer located on the light extraction side and adjusts the light-emitting region. The black matrix layer is preferably located on the light extraction side, separated from the pixel division layer and pixel portion, and adjusts the light-emitting region of light emitted from the pixel portion. The black matrix layer is preferably a cured film obtained by curing a photosensitive composition, more preferably a cured film obtained by curing a photosensitive composition containing multiple colorants, and even more preferably a cured film obtained by curing a photosensitive composition containing a black agent. The openings in the black matrix layer are preferably formed so as to overlap the pixel portion. This configuration significantly reduces external light reflection, reduces the voltage required for light-emitting characteristics, and improves light-emitting brightness.

[0183] The black matrix layer is preferably black in the visible light wavelength range due to the coloring of components such as the resin in the photosensitive composition. More preferably, the black color is due to the coloring of components such as the resin, as well as a thermal color former and / or an oxidative color former. "Colored" refers to red, orange, yellow, green, blue, or purple. The black matrix layer preferably contains a black pigment and / or a mixture of two or more color pigments, and preferably contains an organic black pigment and / or an inorganic black pigment. The organic black pigment preferably contains one or more selected from the group consisting of carbon black, benzofuranone-based black pigments, perylene-based black pigments, and azo-based black pigments. The inorganic black pigment preferably contains fine particles of a metal element, an oxide, a composite oxide, a sulfide, a sulfate, a nitrate, a carbonate, a nitride, a carbide, or an oxynitride. The metal element is preferably Ti, Zr, V, Cr, Mn, Co, Ni, Y, Nb, Hf, Ta, W, Re, Fe, Cu, Zn, or Ag.

[0184] The optical density of the black matrix layer at visible light wavelengths per 1 μm of film thickness is preferably 0.5 to 4.0. This configuration allows the black matrix layer to block incident external light, resulting in a significant effect of suppressing external light reflection. Furthermore, improved light-blocking properties of the black matrix layer at visible light wavelengths and ultraviolet wavelengths reduce external light incident on the pixel division layer, thereby suppressing outgassing from the pixel division layer and preventing deterioration of the light-emitting elements, resulting in a significant effect of improving the reliability of the light-emitting elements. The black matrix layer is preferably black. The optical density of the black matrix layer is as described above for the optical density of the pixel division layer.

[0185] The display device of the present invention preferably has a black matrix layer having a plurality of openings in a planar view. The black matrix layer corresponds to the black matrix layer in a planar view. From the viewpoints of suppressing external light reflection, achieving low-voltage operation of light-emitting characteristics, and improving light-emission brightness, the shape of the openings in the black matrix layer is preferably a closed polygon or a closed polygon with at least some of the sides and / or vertices replaced with arcs. By changing the shape of the openings in the black matrix layer from a perfect circle by at least some straight lines, light emitted from the light-emitting element becomes asymmetric as surface emission, and is strengthened by interference of light emitted from the openings in the black matrix layer. This is believed to significantly reduce the voltage required for light-emission characteristics and improve light-emission brightness. Furthermore, by changing the shape of the openings in the black matrix layer from a perfect circle by at least some straight lines, external light incident through the openings in the black matrix layer is scattered asymmetrically on the surface of the pixel division layer, and the light is weakened by reflection and interference between the first electrode and the second electrode. This is believed to significantly reduce external light reflection.

[0186] In the display device of the present invention, it is preferable that the black matrix layer portion does not overlap the color filter layer portion in a plan view, and further that the relationship represented by the general formula (CF / BM) is satisfied. Ｌ ) ≦ (BM Ｌ ) (CF / BM).

[0187] When a color filter layer is superimposed on a black matrix layer, thicker portions of the color filter layer are formed near the laminated portion. In such cases, light emitted from the light-emitting element passes through the thicker portions of the color filter layer. On the other hand, when a black matrix layer is superimposed on a color filter layer, portions of the color filter layer are covered by the black matrix layer at the edges. In such cases, light emitted from the light-emitting element cannot pass through the portions covered by the black matrix layer. The above-described configuration can avoid the formation of a laminated portion in which a color filter layer is superimposed on a black matrix layer, and a laminated portion in which a black matrix layer is superimposed on a color filter layer, thereby significantly reducing the driving voltage of the light-emitting element and improving the luminance. In addition, the luminance is significantly improved over a wide viewing angle. Figure 5 shows a schematic cross-sectional view and a plan view illustrating an example of a display device having a configuration in which a black matrix layer is superimposed on a color filter layer.

[0188] <Overcoat Layer; Overcoat Layer Portion in Plan View> The display device of the present invention preferably further includes an overcoat layer separating the black matrix layer and the color filter layer. The overcoat layer is a layer that contacts both the black matrix layer and the color filter layer and flattens the surface of the laminated structure. The overcoat layer is preferably a cured film obtained by curing a non-photosensitive composition or a photosensitive composition, more preferably a cured film obtained by curing a photosensitive composition, and even more preferably a cured film obtained by curing a photosensitive composition containing a colorant. The overcoat layer is preferably formed so as to overlap with the pixel portion described above. On the other hand, it is more preferable that the overcoat layer is formed so as not to overlap with the pixel portion described above. This configuration significantly suppresses external light reflection, reduces the driving voltage for light-emitting characteristics, and improves light-emitting brightness. In addition, significantly improves light-emitting brightness over a wide viewing angle.

[0189] <TFT Element Layer> The display device of the present invention preferably further includes a TFT element layer. In the display device of the present invention, the TFT element layer more preferably includes a semiconductor layer, a source electrode, a drain electrode, a gate electrode, and a gate insulating layer. When the display device of the present invention includes a TFT element layer, it preferably further includes an interlayer insulating layer that insulates the conductive layers thereover.

[0190] In the TFT element layer, examples of the semiconductor layer include silicon semiconductor layers such as amorphous silicon (a-Si; amorphous silicon), polycrystalline silicon (p-Si; polycrystalline silicon), microcrystalline silicon, and nanocrystalline silicon; oxide semiconductor layers typified by indium gallium zinc oxide (IGZO; In—Ga—Zn—O); and low temperature polycrystalline oxide (LTPO) that combines polycrystalline silicon and an oxide semiconductor.

[0191] When the display device of the present invention has an active-drive top-emission configuration, it is preferable that the display device has a TFT element layer on a substrate, and the TFT element layer is joined to a patterned island-shaped first electrode.

[0192] <TFT Planarizing Layer and TFT Protective Layer> The display device of the present invention preferably further comprises a TFT planarizing layer and / or a TFT protective layer, and more preferably comprises at least two TFT planarizing layers and / or at least two TFT protective layers. The TFT planarizing layer and / or the TFT protective layer are layers that planarize and / or protect the surface of a laminate structure including TFT elements.

[0193] The TFT planarizing layer and the TFT protective layer are preferably black in the wavelength of visible light due to the coloring of components such as resins in the photosensitive composition, and more preferably black due to the coloring of components such as resins as well as a thermal color former and / or an oxidative color former, etc. Here, "colored" means red, orange, yellow, green, blue, or purple.

[0194] <Interlayer insulating layer> The display device of the present invention preferably further includes an interlayer insulating layer, and more preferably includes at least two interlayer insulating layers. The interlayer insulating layer is a layer that insulates conductive layers such as wiring and electrodes in a laminated structure. The interlayer insulating layer is preferably an interlayer insulating layer that insulates a conductive layer below a TFT planarizing layer and / or a TFT protective layer. Furthermore, the interlayer insulating layer is preferably an interlayer insulating layer that insulates touch panel wiring and / or touch panel electrodes, which will be described later.

[0195] The interlayer insulating layer is preferably black in the wavelength of visible light due to the coloring of components such as resin in the photosensitive composition, and more preferably black due to the coloring of components such as resin as well as a thermal color former and / or an oxidative color former, etc. Here, colored means red, orange, yellow, green, blue, or purple.

[0196] <Touch Panel Wiring and Touch Panel Electrode> The display device of the present invention preferably further has touch panel wiring and / or touch panel electrodes, and more preferably has at least two layers of touch panel wiring and / or at least two layers of touch panel electrodes. The touch panel wiring refers to wiring for electrically connecting a component having a position detection function to an external circuit. The touch panel wiring is preferably a lead-out wiring for electrically connecting the touch panel electrode to an external circuit. The touch panel electrode refers to an electrode having a position detection function. The touch panel electrode is preferably an electrode that performs position detection by a change in capacitance.

[0197] Transparent or non-transparent electrodes can be used for the touch panel wiring. Transparent electrodes are preferred for the touch panel wiring from the viewpoints of increasing the area of ​​the pixel portion, improving the aperture ratio of the display device, and narrowing the bezel of the display device. Such a configuration significantly reduces external light reflection, reduces the voltage required for light-emitting characteristics, and improves the luminance of emitted light. Transparent electrodes are preferred for the touch panel electrodes from the viewpoints of reducing the voltage required for light-emitting characteristics, improving the luminance required for light-emitting characteristics, and reducing the visibility of the touch panel electrodes.

[0198] The display device of the present invention has an in-cell touch panel by including touch panel wiring, a touch panel electrode, and an interlayer insulating layer below the first electrode on the substrate. This configuration significantly improves the effect of improving luminance. The display device of the present invention has an in-cell touch panel by including touch panel wiring, a touch panel electrode, and an interlayer insulating layer below the sealing layer above the second electrode. This configuration significantly improves the effect of improving luminance. The display device of the present invention has an on-cell touch panel by including touch panel wiring, a touch panel electrode, and an interlayer insulating layer below the color filter layer and black matrix layer above the sealing layer. This configuration significantly improves luminance and reduces the number of processes.

[0199] The display device of the present invention has an on-cell touch panel by including touch panel wiring, touch panel electrodes, and an interlayer insulating layer on top of a color filter layer, a black matrix layer, or an overcoat layer (hereinafter referred to as "color filter layer, etc.") on the same substrate. This configuration significantly improves luminance and reduces the number of processes. On the other hand, the display device of the present invention has an out-cell touch panel by bonding touch panel wiring, touch panel electrodes, and an interlayer insulating layer on a different substrate on top of the color filter layer, etc. This configuration significantly reduces the number of processes.

[0200] The display device of the present invention has a build-up polarizing film by including one or more types of polarizers selected from the group consisting of a linear polarizer, a quarter-wave plate, and a circular polarizer on the same substrate as a layer above a color filter layer, etc. This configuration results in a significant effect of suppressing external light reflection. On the other hand, the display device of the present invention has an external polarizing film by bonding one or more types of polarizers selected from the group consisting of a linear polarizer, a quarter-wave plate, and a circular polarizer on a different substrate as a layer above a color filter layer, etc. This configuration results in a significant effect of suppressing external light reflection and reducing the number of processes.

[0201] The display device of the present invention does not include a linear polarizer, a quarter-wave plate, or a circular polarizer on the same substrate as an upper layer such as a color filter layer, making it possible to manufacture a display device without a polarizing film. Similarly, the display device of the present invention does not include a linear polarizer, a quarter-wave plate, or a circular polarizer on a different substrate as an upper layer such as a color filter layer, making it possible to manufacture a display device without a polarizing film. This configuration significantly reduces the light-emitting characteristics by a low driving voltage, improves light-emitting brightness, improves flexibility, and improves bendability. Furthermore, the absence of a polarizing film significantly reduces the cost of manufacturing the display device.

[0202] The sealing layer, color filter layer, black matrix layer, overcoat layer, TFT planarizing layer, TFT protective layer, and interlayer insulating layer are preferably cured films of photosensitive compositions similar to those of the pixel dividing layer, etc. These layers also preferably contain the same colorants, resins, or compounds as those of the pixel dividing layer, etc.

[0203] Examples and preferred descriptions of the (D-DL) colorant in the sealing layer, color filter layer, black matrix layer, overcoat layer, TFT planarizing layer, TFT protective layer, and interlayer insulating layer are the same as the examples and preferred descriptions of the (D-DL) colorant in the pixel dividing layer, etc., described above. Examples and preferred descriptions of the resin in these layers are the same as the examples and preferred descriptions of the (A1-DL) resin, (A2-DL) resin, and (A3-DL) resin in the pixel dividing layer, etc., described above. Examples and preferred descriptions of the compounds in these layers are the same as the examples and preferred descriptions of the (C1-DL) compound, (C2-DL) compound, (C1x-DL) compound, (C2x-DL) compound, compound having a phosphate structure, compound having a sulfur element, and compound having a chlorine element or a bromine element in the pixel dividing layer, described above.

[0204] <Configuration of Display Device> The display device of the present invention preferably has a first electrode, a second electrode, a pixel dividing layer, an organic layer including a light-emitting layer, a sealing layer, a color filter layer, and a black matrix layer on the same substrate. The display device of the present invention preferably has the first electrode, the organic layer including a light-emitting layer, the second electrode, the sealing layer, and the color filter layer stacked in this order.

[0205] For example, when a pixel division layer and a color filter layer are formed on separate substrates and the substrates on which the pixel division layer and the color filter layer are formed are bonded together using an adhesive or the like, poor light emission occurs due to poor positional accuracy of the bonding. Furthermore, because the pixel division layer and the color filter layer are formed on separate substrates, exposure alignment errors occur when forming a laminated structure on each substrate, and poor light emission occurs due to design errors in the laminated structure when the separate substrates are bonded together. On the other hand, when these layers are formed on the same substrate, the display device of the present invention can suppress poor light emission due to poor positional accuracy between the pixel portion and the color filter layer, exposure alignment errors, and the like, thereby significantly suppressing a decrease in panel yield and improving the reliability of light-emitting elements.

[0206] <Configuration of the Display Device in Plan View> The display device of the present invention has a plurality of pixel portions in a plan view. When the pixel portions are defined as the portions of the openings of the pixel dividing layer portion above the first electrode portions and where the organic layer portion including the light-emitting layer is formed, the display device of the present invention preferably has a pixel dividing layer portion having a plurality of pixel portions and a plurality of openings. The display device of the present invention preferably has a pixel dividing layer portion having a plurality of pixel portions, a pixel dividing layer portion having a plurality of openings, a plurality of color filter layer portions, and a black matrix layer portion having a plurality of openings. When the pixel portions are defined as the portions of the openings of the pixel dimension control layer portion above the first electrode portions and where the organic layer portion including the light-emitting layer is formed, the display device of the present invention preferably has a pixel dimension control layer portion having a plurality of openings. The display device of the present invention more preferably has a pixel portion overlapping the openings of the color filter layer portion and the black matrix layer portion in a plan view.

[0207] In the display device of the present invention, it is preferable that the black matrix layer does not overlap the color filter layer in a plan view. This configuration significantly improves the luminance of emitted light. In addition, the luminance is significantly improved over a wide viewing angle.

[0208] In the display device of the present invention, when the black matrix layer portion does not overlap with the color filter layer portion in a planar view, the display device of the present invention preferably further includes an overcoat layer separating the black matrix layer and the color filter layer. Furthermore, the display device of the present invention preferably includes an overcoat layer portion separating the black matrix layer portion and the color filter layer portion in a planar view. In the display device of the present invention, it is preferable that the pixel portion overlaps with the overcoat layer portion in a planar view. On the other hand, it is more preferable that the pixel portion does not overlap with the overcoat layer portion in the display device of the present invention. This configuration significantly reduces external light reflection and improves luminance. Additionally, it significantly improves luminance over a wide viewing angle.

[0209] <Sulfur ions (S － ), chloride ions (Cl － ), bromine ion (Br － ), and indium oxide ions (InO ２ － The display device of the present invention has a detection intensity of sulfur ions (S) measured by time-of-flight secondary ion mass spectrometry at a position 3 nm deep from the surface of the first electrode on the side in contact with the organic layer including the light-emitting layer in the pixel portion. － ) detection strength (S Ｄｅｐ／Ａｎｏｄｅ ) counts, and chlorine ions (Cl － ) is the detected intensity (Cl Ｄｅｐ／Ａｎｏｄｅ ) counts, and bromine ions (Br － ) is the detection intensity (Br Ｄｅｐ／Ａｎｏｄｅ ) counts, and (Cl Ｄｅｐ／Ａｎｏｄｅ ) and (Br Ｄｅｐ／Ａｎｏｄｅ ) is the sum of (X Ｄｅｐ／Ａｎｏｄｅ ), the relationship represented by the general formula (SA-1) and / or the relationship represented by the general formula (XA-1) is satisfied. Ｄｅｐ／Ａｎｏｄｅ )≦200 (SA-1) 2≦(X Ｄｅｐ／Ａｎｏｄｅ )≦200 (XA-1).

[0210] General formula (SA-1) represents a sulfur ion (S － The general formula (XA-1) is a formula showing that the detection intensity of chloride ions (Cl － ) and bromine ion (Br －) is a formula indicating that the sum of the detection intensities of sulfur ions, chlorine ions, and bromine ions falls within a specific range. In a pixel section, the higher the detection intensity of sulfur ions, chlorine ions, and bromine ions on the surface of the first electrode on the side in contact with the organic layer including the light-emitting layer, the greater the proportion of the surface of the first electrode modified by these elements. By configuring the detection intensities of sulfur ions, chlorine ions, and bromine ions as described above, excellent light-emitting characteristics are achieved, allowing for low-voltage drive by adjusting the work function difference. As a result, high light-emitting brightness is achieved when driven at the same voltage. Furthermore, high reliability of the light-emitting element is also achieved. In addition, high light-emitting brightness is thought to be achieved when driven at the same voltage. Furthermore, intentionally adjusting the detection intensities of these ions on the first electrode is thought to control the polarization structure and charge balance on the first electrode in, for example, an organic EL display. This is thought to suppress ion migration and electromigration caused by metal impurities and ionic impurities that adversely affect light-emitting characteristics, thereby contributing to high reliability of the light-emitting element. Furthermore, it is presumed that the suppression of migration and aggregation of metal in the first electrode contributes to the high reliability of the light-emitting device.

[0211] From the viewpoints of achieving low-voltage driving of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting element, it is preferable that the display device of the present invention satisfy the relationships represented by the above general formula (SA-1) and the above general formula (XA-1).

[0212] From the viewpoint of achieving low-voltage driving of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting element, it is preferable that the display device of the present invention further satisfies the relationship represented by general formula (SA-1a) and / or the relationship represented by general formula (XA-1a). Ｄｅｐ／Ａｎｏｄｅ )≦100 (SA-1a) 2≦(X Ｄｅｐ／Ａｎｏｄｅ )≦100 (XA-1a).

[0213] (S Ｄｅｐ／Ａｎｏｄｅ ) is preferably 2 or more, more preferably 4 or more, even more preferably 6 or more, still more preferably 8 or more, and particularly preferably 10 or more, from the viewpoint of achieving low-voltage driving of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device. Ｄｅｐ／Ａｎｏｄｅ) is preferably 200 or less, more preferably 170 or less, even more preferably 150 or less, even more preferably 120 or less, and particularly preferably 100 or less, from the viewpoint of achieving low-voltage driving of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device. Ｄｅｐ／Ａｎｏｄｅ ) is preferably 80 or less, more preferably 60 or less, even more preferably 40 or less, even more preferably 30 or less, and particularly preferably 25 or less.

[0214] (X Ｄｅｐ／Ａｎｏｄｅ From the viewpoints of achieving low-voltage driving of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device, (X) is preferably 2 or more, more preferably 4 or more, even more preferably 6 or more, still more preferably 8 or more, and particularly preferably 10 or more. Ｄｅｐ／Ａｎｏｄｅ From the viewpoint of achieving low-voltage driving of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device, (X) is preferably 200 or less, more preferably 170 or less, even more preferably 150 or less, even more preferably 120 or less, and particularly preferably 100 or less. Ｄｅｐ／Ａｎｏｄｅ ) is preferably 80 or less, more preferably 60 or less, even more preferably 40 or less, even more preferably 30 or less, and particularly preferably 25 or less.

[0215] In addition, sulfur ions (S － ) detection intensity, chloride ion (Cl － ) and bromine ion (Br － The detection intensity of each ion can be calculated as the average value of three measurements by time-of-flight secondary ion mass spectrometry. It is also preferable that the average values ​​of the detection intensities of each ion measured at depths of 3 nm and 4 nm from the surface of the first electrode satisfy the above relationship, and it is more preferable that the average values ​​of the detection intensities of each ion measured at depths of 3 nm, 4 nm, and 5 nm from the surface of the first electrode satisfy the above relationship.

[0216] In the display device of the present invention, the surface of the first electrode on the side in contact with the organic layer including the light-emitting layer can be determined by depth measurement using time-of-flight secondary ion mass spectrometry. First, etching ion species accelerated by applying a bias are bombarded against the pixel portion from the light-emitting layer side, etching in the depth direction toward the first electrode side, while primary ion species accelerated by applying a bias are bombarded against the pixel portion from the light-emitting layer side. The secondary ions emitted during this process are measured, and a depth profile in the depth direction from the light-emitting layer side toward the first electrode side is measured. The point in the depth profile where the detection intensity of at least one ion among elements contained in the outermost layer of the first electrode on the light-emitting layer side is 100 or greater is defined as the surface of the first electrode. The position 3 nm deep from the surface of the first electrode can be determined by measuring the depth profile in the depth direction from the light-emitting layer side toward the first electrode side to the bottom of the first electrode and measuring the thickness of the first electrode, and calculating the sputtering rate of the first electrode from these values.

[0217] Similarly, in the display device of the present invention, the surface of the transparent conductive oxide film layer containing indium as a main element on the side in contact with the organic layer including the light-emitting layer can be determined by depth measurement using time-of-flight secondary ion mass spectrometry. Secondary ions are measured from the light-emitting layer side of the pixel section in the same manner, and a depth profile in the depth direction is measured. In the depth profile, indium oxide ions (InO ２ － ) is determined to be a point at which the detection intensity is 100 or more, which is the surface of the transparent conductive oxide film layer containing indium as a main component element. The position at a depth of 3 nm from the surface of the transparent conductive oxide film layer containing indium as a main component element can be determined by measuring a depth profile in the depth direction from the light-emitting layer side toward the first electrode side to the bottom of the transparent conductive oxide film layer, measuring the thickness of the transparent conductive oxide film layer, and calculating the sputtering rate of the transparent conductive oxide film layer from these values.

[0218] The bottom of the first electrode or the transparent conductive oxide layer is defined as the point in the depth profile where the detection intensity of at least one ion contained in the layer directly below the first electrode or the layer directly below the transparent conductive oxide layer is 100 or greater. The thickness of the first electrode or the transparent conductive oxide layer can be measured using a TEM or SEM. Alternatively, the first electrode or the transparent conductive oxide layer is subjected to elemental composition analysis, and a metal film or oxide film having the same elemental composition as the analyzed layer is deposited to the desired thickness. The resulting metal film or oxide film is then subjected to depth measurement using time-of-flight secondary ion mass spectrometry to measure the depth profile down to the bottom of the metal film or oxide film, and the sputtering rate of the metal film or oxide film can be calculated from the thickness of the metal film or oxide film. Methods for elemental composition analysis include, for example, Rutherford backscattering spectrometry and other analytical techniques.

[0219] In the display device of the present invention, when the first electrode has a transparent conductive oxide film layer and a non-transparent conductive metal layer, and the first electrode has a transparent conductive oxide film layer containing indium as a main element on the outermost surface thereof on the light-emitting layer side, the display device of the present invention is characterized in that indium oxide ions (InO ) are measured by time-of-flight secondary ion mass spectrometry at a position 3 nm deep from the surface of the transparent conductive oxide film layer on the side in contact with the organic layer including the light-emitting layer in the pixel section. ２ － ) is the detected intensity (InO Ｄｅｐ／Ａｎｏｄｅ ) counts, it is preferable that the relationship represented by the general formula (SA-1) above is satisfied, and further the relationships represented by the general formulas (SA-2) and (InSA-1) are satisfied, and / or the relationship represented by the general formula (XA-1) above is satisfied, and further the relationships represented by the general formulas (XA-2) and (InXA-1) are satisfied. Ｄｅｐ／Ａｎｏｄｅ ) / (InO Ｄｅｐ／Ａｎｏｄｅ )≦0.1000 (SA-2) 1,000≦(InO Ｄｅｐ／Ａｎｏｄｅ )≦40,000 (InSA-1) 0.0001≦(X Ｄｅｐ／Ａｎｏｄｅ ) / (InO Ｄｅｐ／Ａｎｏｄｅ )≦0.1000 (XA-2) 1,000≦(InOＤｅｐ／Ａｎｏｄｅ )≦40,000 (InXA-1).

[0220] In the case of the above-mentioned configuration, the display device of the present invention has, in the pixel section, a transparent conductive oxide film layer containing indium as a main component and having a thickness of 3 nm or more, as the outermost layer on the light-emitting layer side of the first electrode. － ) and the detected intensity of indium oxide ions (InO ２ － The general formula (XA-2) is a formula showing that the detected intensity of chlorine ions (Cl － ) and bromine ion (Br － ) and the sum of the detected intensities of indium oxide ions (InO ２ － The general formula (InSA-1) and the general formula (InXA-1) are indium oxide ions (InO ２ － ) is a formula showing that the detection intensity of indium oxide ions is within a specific range. In the pixel portion, the greater the detection intensity of indium oxide ions on the surface of the first electrode on the side in contact with the organic layer including the light-emitting layer, the greater the proportion of the surface of the transparent conductive oxide film layer containing indium as a main element that is exposed. By adopting such a configuration, the effects of lowering the driving voltage for light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting element are significant.

[0221] From the viewpoint of achieving low-voltage driving of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting element, it is preferable that the display device of the present invention satisfies the relationship represented by the above general formula (SA-1), further satisfies the relationships represented by the general formulas (SA-2) and (InSA-1), and further satisfies the relationship represented by the above general formula (XA-1), and further satisfies the relationships represented by the general formulas (XA-2) and (InXA-1).

[0222] (S Ｄｅｐ／Ａｎｏｄｅ ) / (InO Ｄｅｐ／Ａｎｏｄｅ) is preferably 0.0003 or more, more preferably 0.0005 or more, and even more preferably 0.0010 or more, from the viewpoint of achieving low-voltage driving of the light-emitting characteristics, improving the luminance of the light-emitting element, and improving the reliability of the light-emitting element. Furthermore, from the viewpoint of achieving low-voltage driving of the light-emitting characteristics and improving the luminance of the light-emitting element, it is preferably 0.0020 or more, more preferably 0.0040 or more, even more preferably 0.0060 or more, even more preferably 0.0080 or more, and particularly preferably 0.0100 or more. On the other hand, (S Ｄｅｐ／Ａｎｏｄｅ ) / (InO Ｄｅｐ／Ａｎｏｄｅ ) is preferably 0.0800 or less, more preferably 0.0600 or less, even more preferably 0.0400 or less, even more preferably 0.0300 or less, and particularly preferably 0.0250 or less.

[0223] (InO Ｄｅｐ／Ａｎｏｄｅ ) is more preferably 1,500 or more, and even more preferably 2,000 or more. Ｄｅｐ／Ａｎｏｄｅ ) is preferably 30,000 or less, more preferably 20,000 or less, even more preferably 15,000 or less, and particularly preferably 10,000 or less. Furthermore, from the viewpoint of achieving low-voltage driving of light-emitting characteristics and improving light-emitting brightness, it is preferably 7,500 or less, more preferably 6,000 or less, even more preferably 5,000 or less, even more preferably 4,000 or less, and particularly preferably 3,500 or less.

[0224] (X Ｄｅｐ／Ａｎｏｄｅ ) / (InO Ｄｅｐ／Ａｎｏｄｅ ) is preferably 0.0003 or more, more preferably 0.0005 or more, and even more preferably 0.0010 or more, from the viewpoint of achieving low-voltage driving of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device. Furthermore, from the viewpoint of achieving low-voltage driving of light-emitting characteristics and improving light-emitting brightness, it is preferably 0.0020 or more, more preferably 0.0040 or more, even more preferably 0.0060 or more, even more preferably 0.0080 or more, and particularly preferably 0.0100 or more. On the other hand, (X Ｄｅｐ／Ａｎｏｄｅ ) / (InO Ｄｅｐ／Ａｎｏｄｅ ) is preferably 0.0800 or less, more preferably 0.0600 or less, even more preferably 0.0400 or less, even more preferably 0.0300 or less, and particularly preferably 0.0250 or less.

[0225] (InO Ｄｅｐ／Ａｎｏｄｅ ) is more preferably 1,500 or more, and even more preferably 2,000 or more. Ｄｅｐ／Ａｎｏｄｅ ) is preferably 30,000 or less, more preferably 20,000 or less, even more preferably 15,000 or less, and particularly preferably 10,000 or less. Furthermore, from the viewpoint of achieving low-voltage driving of light-emitting characteristics and improving light-emitting brightness, it is preferably 7,500 or less, more preferably 6,000 or less, even more preferably 5,000 or less, even more preferably 4,000 or less, and particularly preferably 3,500 or less.

[0226] Indium oxide ions (InO ２ － The detection intensity of each ion can be calculated as the average value of three measurements by time-of-flight secondary ion mass spectrometry. It is also preferable that the average values ​​of the detection intensities of each ion measured at depths of 3 nm and 4 nm from the surface of the first electrode satisfy the above relationship, and it is more preferable that the average values ​​of the detection intensities of each ion measured at depths of 3 nm, 4 nm, and 5 nm from the surface of the first electrode satisfy the above relationship.

[0227] <Carbon ions (C － ) and indium oxide ions (InO ２ － ) detected intensity> In the display device of the present invention, from the viewpoint of low-voltage driving of light-emitting characteristics, improvement of light-emitting brightness, and improvement of reliability of the light-emitting element, the display device of the present invention is configured to detect carbon ions (C － ) detection intensity (C Ｄｅｐ／Ａｎｏｄｅ ) counts, it is preferable that the relationship represented by general formula (CA-1) is satisfied. Ｄｅｐ／Ａｎｏｄｅ )≦4,000 (CA-1) General formula (CA-1) is a carbon ion (C － ) is a formula indicating that the detected intensity of carbon ions is within a specific range. In the pixel section, the greater the detected intensity of carbon ions on the surface of the first electrode on the side in contact with the organic layer including the light-emitting layer, the greater the abundance ratio of carbon atoms on the surface of the first electrode. Ｄｅｐ／Ａｎｏｄｅ) is preferably 50 or more, more preferably 75 or more, and even more preferably 100 or more. Ｄｅｐ／Ａｎｏｄｅ ) is preferably 3,000 or less, more preferably 2,000 or less, and even more preferably 1,000 or less.

[0228] In the display device of the present invention, when the first electrode has a transparent conductive oxide film layer and a non-transparent conductive metal layer, and the first electrode has a transparent conductive oxide film layer containing indium as a main element on the outermost surface thereof on the light-emitting layer side, the display device of the present invention is characterized in that indium oxide ions (InO ) are measured by time-of-flight secondary ion mass spectrometry at a position 3 nm deep from the surface of the transparent conductive oxide film layer on the side in contact with the organic layer including the light-emitting layer in the pixel section. ２ － ) is the detected intensity (InO Ｄｅｐ／Ａｎｏｄｅ ) counts, it is preferable that the relationship represented by the above general formula (CA-1) is satisfied, and further that the relationships represented by the general formulas (CA-2) and (InCA-1) are satisfied. Ｄｅｐ／Ａｎｏｄｅ ) / (InO Ｄｅｐ／Ａｎｏｄｅ )≦4.0 (CA-2) 1,000≦(InO Ｄｅｐ／Ａｎｏｄｅ )≦40,000 (InCA-1).

[0229] General formula (CA-2) represents a carbon ion (C － ) and the detected intensity of indium oxide ions (InO ２ － The general formula (InCA-1) is a formula showing that the detected intensity of indium oxide ions (InO ２ － ) is within a specific range. By adopting such a configuration, the effects of lowering the driving voltage for light-emitting characteristics, improving the light-emitting brightness, and improving the reliability of the light-emitting element are significant.

[0230] (C Ｄｅｐ／Ａｎｏｄｅ ) / (InO Ｄｅｐ／Ａｎｏｄｅ) is preferably 0.003 or more, more preferably 0.005 or more, even more preferably 0.010 or more, and particularly preferably 0.020 or more. Furthermore, from the viewpoint of achieving low-voltage driving of light-emitting characteristics and improving light-emitting brightness, it is preferably 0.050 or more, more preferably 0.075 or more, and even more preferably 0.100 or more. On the other hand, (C Ｄｅｐ／Ａｎｏｄｅ ) / (InO Ｄｅｐ／Ａｎｏｄｅ ) is preferably 3.0 or less, more preferably 2.0 or less, and even more preferably 1.0 or less. Ｄｅｐ／Ａｎｏｄｅ ) is preferably 1,200 or more, more preferably 1,500 or more, and even more preferably 2,000 or more. Ｄｅｐ／Ａｎｏｄｅ ) is preferably 30,000 or less, more preferably 20,000 or less, even more preferably 15,000 or less, and particularly preferably 10,000 or less. Furthermore, from the viewpoint of achieving low-voltage driving of light-emitting characteristics and improving light-emitting brightness, it is preferably 7,500 or less, more preferably 6,000 or less, even more preferably 5,000 or less, even more preferably 4,000 or less, and particularly preferably 3,500 or less.

[0231] Carbon ions (C － The detection intensity of each ion can be calculated as the average value of three measurements by time-of-flight secondary ion mass spectrometry. It is also preferable that the average values ​​of the detection intensities of each ion measured at depths of 3 nm and 4 nm from the surface of the first electrode satisfy the above relationship, and it is more preferable that the average values ​​of the detection intensities of each ion measured at depths of 3 nm, 4 nm, and 5 nm from the surface of the first electrode satisfy the above relationship.

[0232] <Cyanide ions (CN) on the first electrode － ) and indium oxide ions (InO ２ － The display device of the present invention is designed to detect a cyanide ion (CN) concentration at a depth of 3 nm from the surface of the first electrode on the side in contact with the organic layer including the light-emitting layer in a pixel portion, as measured by time-of-flight secondary ion mass spectrometry, from the viewpoints of lowering the voltage required for light-emitting characteristics, improving the luminance of light emitted, and improving the reliability of the light-emitting element. － ) detection strength (CN Ｄｅｐ／Ａｎｏｄｅ) counts, it is preferable that the relationship represented by the general formula (CNA-1) is satisfied. Ｄｅｐ／Ａｎｏｄｅ )≦4,000 (CNA-1) The general formula (CNA-1) is a cyanide ion (CN － ) is a formula indicating that the detection intensity of cyanide ions is within a specific range. In the pixel section, the greater the detection intensity of cyanide ions on the surface of the first electrode on the side in contact with the organic layer including the light-emitting layer, the greater the proportion of carbon atoms bonded to nitrogen atoms on the surface of the first electrode. Ｄｅｐ／Ａｎｏｄｅ ) is preferably 50 or more, more preferably 75 or more, and even more preferably 100 or more. Ｄｅｐ／Ａｎｏｄｅ ) is preferably 3,000 or less, more preferably 2,000 or less, and even more preferably 1,000 or less.

[0233] In the display device of the present invention, when the first electrode has a transparent conductive oxide film layer and a non-transparent conductive metal layer, and the first electrode has a transparent conductive oxide film layer containing indium as a main element on the outermost surface thereof on the light-emitting layer side, the display device of the present invention is characterized in that indium oxide ions (InO ) are measured by time-of-flight secondary ion mass spectrometry at a position 3 nm deep from the surface of the transparent conductive oxide film layer on the side in contact with the organic layer including the light-emitting layer in the pixel section. ２ － ) is the detected intensity (InO Ｄｅｐ／Ａｎｏｄｅ ) counts, it is preferable that the relationship represented by the above general formula (CNA-1) is satisfied, and further that the relationships represented by the general formulas (CNA-2) and (InCNA-1) are satisfied. Ｄｅｐ／Ａｎｏｄｅ ) / (InO Ｄｅｐ／Ａｎｏｄｅ )≦4.0 (CNA-2) 1,000≦(InO Ｄｅｐ／Ａｎｏｄｅ )≦40,000 (InCNA-1).

[0234] The general formula (CNA-2) represents a cyanide ion (C － ) and the detected intensity of indium oxide ions (InO ２ － The general formula (InCNA-1) is a formula showing that the detected intensity of indium oxide ions (InO ２ －) is within a specific range. By adopting such a configuration, the effects of lowering the driving voltage for light-emitting characteristics, improving the light-emitting brightness, and improving the reliability of the light-emitting element are significant.

[0235] (CN Ｄｅｐ／Ａｎｏｄｅ ) / (InO Ｄｅｐ／Ａｎｏｄｅ ) is preferably 0.003 or more, more preferably 0.005 or more, even more preferably 0.010 or more, and particularly preferably 0.020 or more. Furthermore, from the viewpoint of achieving low-voltage driving of light-emitting characteristics and improving light-emitting brightness, it is preferably 0.050 or more, more preferably 0.075 or more, and even more preferably 0.100 or more. On the other hand, (CN Ｄｅｐ／Ａｎｏｄｅ ) / (InO Ｄｅｐ／Ａｎｏｄｅ ) is preferably 3.0 or less, more preferably 2.0 or less, and even more preferably 1.0 or less. Ｄｅｐ／Ａｎｏｄｅ ) is preferably 1,200 or more, more preferably 1,500 or more, and even more preferably 2,000 or more. Ｄｅｐ／Ａｎｏｄｅ ) is preferably 30,000 or less, more preferably 20,000 or less, even more preferably 15,000 or less, and particularly preferably 10,000 or less. Furthermore, from the viewpoint of achieving low-voltage driving of light-emitting characteristics and improving light-emitting brightness, it is preferably 7,500 or less, more preferably 6,000 or less, even more preferably 5,000 or less, even more preferably 4,000 or less, and particularly preferably 3,500 or less.

[0236] Furthermore, cyanide ions (CN － The detection intensity of each ion can be calculated as the average value of three measurements by time-of-flight secondary ion mass spectrometry. It is also preferable that the average values ​​of the detection intensities of each ion measured at depths of 3 nm and 4 nm from the surface of the first electrode satisfy the above relationship, and it is more preferable that the average values ​​of the detection intensities of each ion measured at depths of 3 nm, 4 nm, and 5 nm from the surface of the first electrode satisfy the above relationship.

[0237] <Sulfur ions (S － ), chloride ions (Cl － ), and bromine ion (Br －From the viewpoint of achieving low-voltage driving of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting element, the display device of the present invention is configured to measure the ratio of sulfur ions (S) to the total negative ion detection intensity measured by time-of-flight secondary ion mass spectrometry on the surface of the pixel dividing layer unit on the side in contact with the second electrode unit or on the side exposed at the opening of the second electrode unit in a region that does not overlap with a region where an organic layer unit including a light-emitting layer on the pixel dividing layer unit is formed. － ) is the ratio of the detected intensities (S ＰＤＬ ) and chlorine ions (Cl － The ratio of the detected intensities of (Cl) ＰＤＬ ) and bromine ions (Br － The ratio of the detected intensities of (Br ＰＤＬ ) and (Cl ＰＤＬ ) and (Br ＰＤＬ ) is the sum of (X ＰＤＬ ) in the pixel portion, on the surface of the first electrode portion on the side in contact with the organic layer portion including the light-emitting layer, the proportion of sulfur ions (S － ) is the ratio of the detected intensities (S Ａｎｏｄｅ ) and chlorine ions (Cl － The ratio of the detected intensities of (Cl) Ａｎｏｄｅ ) and bromine ions (Br － The ratio of the detected intensities of (Br Ａｎｏｄｅ ) and (Cl Ａｎｏｄｅ ) and (Br Ａｎｏｄｅ ) is the sum of (X Ａｎｏｄｅ ), it is preferable that the relationship represented by the general formula (SD-1) and / or the relationship represented by the general formula (XD-1) is satisfied. Ａｎｏｄｅ ) / (S ＰＤＬ )≦20 (SD-1) 0.1≦(X Ａｎｏｄｅ ) / (X ＰＤＬ )≦20 (XD-1).

[0238] The surface of the pixel division layer unit refers to the surface of the pixel division layer unit exposed by removing the second electrode unit in a region where the organic layer unit including the light-emitting layer on the pixel division layer unit is not formed, or the surface of the pixel division layer unit where neither the organic layer unit including the light-emitting layer on the pixel division layer unit nor the second electrode unit is formed. The surface of the first electrode unit refers to the surface of the first electrode unit exposed by removing the organic layer unit including the light-emitting layer on the first electrode unit. General formula (SD-1) represents a sulfur ion (S － ) on the first electrode portion and the ratio of the detection intensity of sulfur ions (S － The general formula (XD-1) is a formula showing that the ratio of the detected intensity of chloride ions (Cl) on the pixel dividing layer portion is a specific intensity ratio. － ) and the ratio of the detected intensities of bromine ions (Br － ) on the first electrode part, and the ratio of the detected intensities of chloride ions (Cl － ) and the ratio of the detected intensities of bromine ions (Br － ) is the specific intensity ratio. Ａｎｏｄｅ ) / (S ＰＤＬ ) and (X Ａｎｏｄｅ ) / (X ＰＤＬ ) indicates that the proportion of the surface of the first electrode portion that has been surface-modified by these elements is greater. In other words, it indicates that these elements are present in greater amounts on the surface of the first electrode portion. By adopting such a configuration, the effects of lowering the driving voltage for light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device are significant.

[0239] (S Ａｎｏｄｅ ) / (S ＰＤＬ ) is preferably 0.3 or more, more preferably 0.5 or more, and even more preferably 1.0 or more. Ａｎｏｄｅ ) / (S ＰＤＬ ) is preferably 15 or less, more preferably 12 or less, and even more preferably 10 or less.

[0240] (X Ａｎｏｄｅ ) / (X ＰＤＬ ) is preferably 0.3 or more, more preferably 0.5 or more, and even more preferably 1.0 or more. Ａｎｏｄｅ ) / (X ＰＤＬ) is preferably 15 or less, more preferably 12 or less, and even more preferably 10 or less.

[0241] From the viewpoint of achieving low-voltage driving of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting element, the display device of the present invention preferably satisfies the relationship represented by the above general formula (SD-1), and further satisfies the relationships represented by the general formulas (SD-2) and (SD-3), and / or satisfies the relationship represented by the above general formula (XD-1), and further satisfies the relationships represented by the general formulas (XD-2) and (XD-3). Ａｎｏｄｅ )≦0.00200 (SD-2) 0.0001≦(S ＰＤＬ )≦0.0100 (SD-3) 0.00001≦(X Ａｎｏｄｅ )≦0.00200 (XD-2) 0.0001≦(X ＰＤＬ )≦0.0100 (XD-3) General formula (SD-2) represents the sulfur ion (S － The general formula (SD-3) indicates that the ratio of the detected intensities of sulfur ions (S － The general formula (XD-2) is a formula showing that the ratio of the detection intensities of chloride ions (Cl ) on the first electrode part is within a specific range. － ) and the ratio of the detected intensities of bromine ions (Br － The general formula (XD-2) is a formula showing that the sum of the ratios of the detected intensities of chloride ions (Cl ) on the pixel dividing layer portion is within a specific range. － ) and the ratio of the detected intensities of bromine ions (Br － ) is within a specific range. By adopting such a configuration, the effects of lowering the voltage required for light emission characteristics, improving the light emission luminance, and improving the reliability of the light-emitting element are significant.

[0242] From the viewpoint of achieving low-voltage driving of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting element, it is preferable that the display device of the present invention satisfies the relationship represented by the above general formula (SD-1), and further satisfies the relationships represented by the general formulas (SD-2) and (SD-3), and further satisfies the relationship represented by the above general formula (XD-1), and further satisfies the relationships represented by the general formulas (XD-2) and (XD-3).

[0243] (S Ａｎｏｄｅ ) is preferably 0.00003 or more, more preferably 0.00005 or more, and even more preferably 0.00010 or more. Ａｎｏｄｅ ) is preferably 0.00150 or less, more preferably 0.00120 or less, and even more preferably 0.00100 or less. ＰＤＬ ) is preferably 0.0002 or more, more preferably 0.0003 or more, and even more preferably 0.0005 or more. ＰＤＬ ) is preferably 0.0070 or less, more preferably 0.0050 or less, and even more preferably 0.0030 or less.

[0244] (X Ａｎｏｄｅ ) is preferably 0.00003 or more, more preferably 0.00005 or more, and even more preferably 0.00010 or more. Ａｎｏｄｅ ) is preferably 0.00150 or less, more preferably 0.00120 or less, and even more preferably 0.00100 or less. ＰＤＬ ) is preferably 0.0002 or more, more preferably 0.0003 or more, and even more preferably 0.0005 or more. ＰＤＬ ) is preferably 0.0070 or less, more preferably 0.0050 or less, and even more preferably 0.0030 or less.

[0245] In the display device of the present invention, it is preferable that, in a plan view, the pixel unit overlaps with and is spaced from the openings of the color filter layer unit and the black matrix layer unit. When the display device of the present invention has such a configuration, the color filter layer unit is spaced from the pixel unit, and in the display device of the present invention, the distance between the color filter layer unit and the pixel unit is preferably 5.0 to 20.0 μm. This configuration allows the pixel unit, color filter layer unit, and black matrix layer unit to be disposed at an appropriate distance, resulting in significant effects of suppressing external light reflection, lowering the voltage required for light-emitting characteristics, improving light-emitting brightness, improving the purity of emitted light color, and improving the reliability of the light-emitting element. From the viewpoints of suppressing external light reflection and improving the reliability of the light-emitting element, the distance between the color filter layer unit and the pixel unit is preferably 5.0 μm or more, more preferably 7.0 μm or more, even more preferably 9.0 μm or more, and particularly preferably 10.0 μm or more. On the other hand, the distance between the color filter layer portion and the pixel portion is preferably 20.0 μm or less, more preferably 18.0 μm or less, even more preferably 16.0 μm or less, and particularly preferably 15.0 μm or less, from the viewpoints of achieving low-voltage driving of light-emitting characteristics, improving light-emitting brightness, improving flexibility, and improving bendability.

[0246] <Configuration of Display Device Having Pixel Units of Multiple Colors> In the display device of the present invention, the pixel unit preferably includes, in a planar view, pixel units of a first color, pixel units of a second color, and pixel units of a third color, the first color, second color, and third color being different from one another, and the color filter layer preferably includes, in a planar view, color filter units of the first color corresponding to the pixel units of the first color, color filter units of the second color corresponding to the pixel units of the second color, and color filter units of the third color corresponding to the pixel units of the third color. Note that the first color filter unit corresponding to the pixel units of the first color means that the pixel units of the first color and the color filter unit of the first color are of similar colors. The same applies to the second color filter unit corresponding to the pixel units of the second color and the third color filter unit corresponding to the pixel units of the third color. The difference between the maximum emission wavelength in the emission spectrum of light emitted from the pixel units of the first color and the maximum transmission wavelength in the transmission spectrum of the color filter unit of the first color is preferably 30 nm or less, more preferably 20 nm or less, and even more preferably 10 nm or less. The same applies to the color filter layer portion of the third color corresponding to the pixel portion of the second color, and the color filter layer portion of the third color corresponding to the pixel portion of the third color.

[0247] In the display device of the present invention, in a plan view, it is preferable that the first-color pixel portion overlaps the first-color color filter layer portion, the second-color pixel portion overlaps the second-color color filter layer portion, and the third-color pixel portion overlaps the third-color color filter layer portion. When the first, second, and third colors are green, red, and blue, respectively, the display device of the present invention can provide a display device capable of full-color emission. Therefore, with the above configuration, the display device of the present invention can emit full-color light and can also have excellent external light reflection suppression effects, excellent emission characteristics that allow low-voltage operation, high emission brightness, and high reliability of the light-emitting element. Figure 7 shows a plan view of an example of a display device configured to include first-color pixel portions, second-color pixel portions, and third-color pixel portions.

[0248] In the display device of the present invention, when the display device is configured as described above, it is preferable that the average pattern dimension in the major axis direction of the pixel portions of the first color is smaller than the average pattern dimension in the major axis direction of the pixel portions of the second color and is also smaller than the average pattern dimension in the major axis direction of the pixel portions of the third color. In the display device of the present invention, it is preferable that the average pattern dimension in the major axis direction of the pixel portions of the first color is 5.0 to 25.0 μm. This configuration significantly reduces external light reflection, reduces the voltage required for driving light-emitting characteristics, improves light-emitting brightness, improves the purity of emitted light color, and improves the reliability of the light-emitting element.

[0249] The average pattern dimension in the major axis direction of the first color pixel portion is preferably 5.0 μm or more, more preferably 6.0 μm or more, even more preferably 7.0 μm or more, even more preferably 8.0 μm or more, and particularly preferably 10.0 μm or more, from the viewpoints of suppressing external light reflection, achieving low-voltage operation of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device. On the other hand, the average pattern dimension in the major axis direction of the first color pixel portion is preferably 50.0 μm or less, more preferably 40.0 μm or less, and even more preferably 35.0 μm or less, from the viewpoints of suppressing external light reflection, achieving low-voltage operation of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device. Furthermore, the pattern dimension in the major axis direction of the first color pixel portion is preferably 30.0 μm or less, more preferably 25.0 μm or less, even more preferably 20.0 μm or less, even more preferably 17.0 μm or less, and particularly preferably 15.0 μm or less, from the viewpoints of suppressing external light reflection, achieving low-voltage operation of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device.

[0250] Examples and preferred descriptions regarding the average value of the pattern dimension in the major axis direction of the pixel portion of the second color and the average value of the pattern dimension in the major axis direction of the pixel portion of the third color are the same as the examples and preferred descriptions regarding the average value of the pattern dimension in the major axis direction of the pixel portion of the first color described above.

[0251] In the display device of the present invention, the average value of the pattern dimension in the major axis direction of the pixel portion of the first color is (CD Ｌ１ ) μm, and the average pattern dimension in the long axis direction of the pixel portion of the second color is (CD Ｌ２ ) μm, and the average pattern dimension in the major axis direction of the pixel portion of the third color is (CD Ｌ３) μm, the relationship expressed by the general formula (CD-1a) and the general formula (CD-1b) is satisfied. The display device of the present invention preferably further satisfies the relationship expressed by the general formula (CD-2a) or the general formula (CD-3a), and more preferably satisfies the relationship expressed by the general formula (CD-2b) or the general formula (CD-3b). Ｌ１ ) < (CD Ｌ２ ) (CD-1a) (CD Ｌ１ ) < (CD Ｌ３ ) (CD-1b) (CD Ｌ２ ) ≦ (CD Ｌ３ ) (CD-2a) (CD Ｌ２ ) < (CD Ｌ３ ) (CD-2b) (CD Ｌ２ ) ≧ (CD Ｌ３ ) (CD-3a) (CD Ｌ２ )>(CD Ｌ３ ) (CD-3b).

[0252] The display device of the present invention preferably further satisfies the relationship represented by the general formula (CD-1 / 2a) and / or the general formula (CD-1 / 3a), and more preferably satisfies the relationship represented by the general formula (CD-1 / 2a) and the general formula (CD-1 / 3a). The display device of the present invention preferably further satisfies the relationship represented by the general formula (CD-2 / 3a) or the general formula (CD-2 / 3b). 1.01×(CD Ｌ１ ) ≦ (CD Ｌ２ ) ≦ 1.40 × (CD Ｌ２ ) (CD-1 / 2a) 1.20×(CD Ｌ１ ) ≦ (CD Ｌ３ ) ≦ 1.60 × (CD Ｌ１ ) (CD-1 / 3a) 1.01×(CD Ｌ２ ) ≦ (CD Ｌ３ ) ≦ 1.40 × (CD Ｌ２ ) (CD-2 / 3a) 1.01×(CD Ｌ３ ) ≦ (CD Ｌ２ ) ≦ 1.40 × (CD Ｌ３ ) (CD-2 / 3b).

[0253] In the first color pixel portion, second color pixel portion, and third color pixel portion of the display device of the present invention, from the viewpoints of suppressing external light reflection, achieving low-voltage driving of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting element, the first color is preferably green or red, more preferably green. The second color is preferably green, red, or blue, more preferably red. The third color is preferably red or blue, more preferably blue. When the first color is green and the second color is red, the third color is preferably blue. When the first color is green and the second color is blue, the third color is preferably red. When the first color is red, the second color is preferably green or blue, more preferably green. When the first color is red and the second color is green, the third color is preferably blue. It is particularly preferable that the first color is green, the second color is red, and the third color is blue. It is also preferable that the first color is green, the second color is blue, and the third color is red.

[0254] In the display device of the present invention, in plan view, the pixel unit further includes a pixel unit of an additional color, the first color, the second color, the third color, and the additional color being different from one another, and in plan view, the color filter layer unit further includes a color filter layer unit of the additional color corresponding to the additional color, and in plan view, the pixel unit of the additional color is preferably superimposed on the color filter layer unit of the additional color. The number of additional colors is preferably one, and it is also preferable that the number of additional colors is two or more. The additional color is preferably one or more colors selected from the group consisting of white, orange, yellow, and purple.

[0255] In the display device of the present invention, the maximum emission wavelength in the emission spectrum of light emitted from the red pixel portion is preferably 560 to 700 nm, the maximum emission wavelength in the emission spectrum of light emitted from the green pixel portion is preferably 500 to 560 nm, and the maximum emission wavelength in the emission spectrum of light emitted from the blue pixel portion is preferably 420 to 500 nm.

[0256] In the display device of the present invention, the maximum transmission wavelength in the transmission spectrum of the red color filter layer is preferably 560 to 700 nm, the maximum transmission wavelength in the transmission spectrum of the green color filter layer is preferably 500 to 560 nm, and the maximum transmission wavelength in the transmission spectrum of the blue color filter layer is preferably 420 to 500 nm.

[0257] <Method for forming a first electrode having specific detection intensities of sulfur ions (S-), chloride ions (Cl-), and bromine ions (Br-)> A method for forming a first electrode having specific detection intensities of sulfur ions, chloride ions, and bromine ions on the surface of the first electrode that contacts an organic layer including an emitting layer in a pixel portion of a display device of the present invention will be described. The first electrode in the display device of the present invention can be obtained, for example, by any of the following methods (I) to (V). (I) A method of forming a pattern of a photosensitive composition on a first electrode using a photosensitive composition containing an (A) alkali-soluble resin, a (C) photosensitizer, and a (I) compound described later, thereby exposing the outermost layer of the first electrode (hereinafter referred to as "(I) method of forming a pattern of a photosensitive composition containing a specific compound"); (II) A method of forming a coating film of a non-photosensitive composition on a first electrode using a non-photosensitive composition containing an (A) alkali-soluble resin and a (I) compound described later, and then patterning the coating film of the non-photosensitive composition to expose the outermost layer of the first electrode (hereinafter referred to as "(II) method of patterning a coating film of a non-photosensitive composition containing a specific compound"); (III) A method of contacting a solution containing a (I) compound described later on the first electrode (hereinafter referred to as "(III) method of contacting with a solution of a specific compound"); (IV) A method of gasifying a (I) compound described later and contacting the gasified film with the first electrode (hereinafter referred to as "(IV) method of contacting with a gas of a specific compound"); (V) A method of ionizing the compound (I) described below and contacting it with the first electrode (hereinafter, "(V) method of contacting with ions of a specific compound").

[0258] <Method for forming a pattern of a photosensitive composition containing a specific compound (I)> The first electrode in the display device of the present invention can be formed by a method of forming a pattern on the first electrode using a photosensitive composition containing the compound (I) described below, which is a compound containing elemental sulfur, elemental chlorine, or elemental bromine. The method for forming a pattern of a photosensitive composition containing the specific compound (I) involves modifying the surface of the first electrode with elemental sulfur, elemental chlorine, or elemental bromine, and exposing the outermost layer of the surface-modified first electrode during pattern formation. The pattern formation method is preferably a method of directly forming a pattern by photolithography. The cured film having a pattern formed by this method corresponds to the pixel dividing layer, and the display device of the present invention can be manufactured. The photosensitive composition containing the specific compound contains (A) an alkali-soluble resin and (C) a photosensitizer. Examples of the alkali-soluble resin (A) include resins described below. Examples of the photosensitizer (C) include compounds described below. The photosensitive composition containing the specific compound preferably further contains a solvent. Examples of the solvent include compounds described below.

[0259] Examples of methods for forming a pattern on the first electrode using a photosensitive composition containing a compound containing elemental sulfur, elemental chlorine, or elemental bromine include: (1) a method of forming a pattern by irradiating the photosensitive composition with actinic rays through a photomask and then developing the photosensitive composition with a developer, i.e., a method of directly forming a pattern by photolithography.

[0260] The actinic rays used for irradiation with actinic rays through a photomask are preferably j-line (wavelength 313 nm), i-line (wavelength 365 nm), h-line (wavelength 405 nm), or g-line (wavelength 436 nm) from a mercury lamp, and more preferably a mixture of i-line, h-line, and g-line. The developer used for development using a developer is preferably an alkaline solution, and more preferably an organic alkaline solution or an aqueous solution of an alkaline compound. An organic solvent may also be used as the developer.

[0261] After developing with a developer to form a pattern, it is preferable to further wash the resist with a rinse solution. The rinse solution is preferably water, an aqueous solution of an alcohol, an aqueous solution of an ester, an aqueous solution of an acidic compound, or an organic solvent, and more preferably water.

[0262] <(II) Method for Patterning a Coating of a Non-Photosensitive Composition Containing a Specific Compound> The first electrode in the display device of the present invention can be formed by a method in which a non-photosensitive composition containing the compound (I) described below, which is a compound containing elemental sulfur, elemental chlorine, or elemental bromine, is formed on the first electrode and then patterned. The method for patterning a coating of a non-photosensitive composition containing the specific compound (II) involves modifying the surface of the first electrode with elemental sulfur, elemental chlorine, or elemental bromine, and exposing the outermost layer of the surface-modified first electrode during patterning. The patterning method is preferably a patterning method using etching. The patterned cured film formed by this method corresponds to the pixel dividing layer, and the display device of the present invention can be manufactured. The non-photosensitive composition containing the specific compound contains (A) an alkali-soluble resin. Examples of the alkali-soluble resin (A) include the resins described below. The non-photosensitive composition containing the specific compound preferably further contains a solvent. Examples of the solvent include the compounds described below.

[0263] Examples of methods for patterning a non-photosensitive composition containing a compound containing sulfur, chlorine, or bromine elements after forming a film on the first electrode include: (1) a method for patterning by wet etching using a photoresist; (2) a method for patterning by dry etching using a photoresist; or (3) a method for patterning by using a photoresist and simultaneously opening the photoresist during development.

[0264] Examples of the etching solution used in wet etching include an acidic solution, an alkaline solution, and an organic solvent. Examples of the etching gas used in dry etching include a halogenated hydrocarbon, a sulfur halide, a boron halide, a rare gas halide, a halogen, oxygen, ozone, and a rare gas. The developer used in developing the photoresist is preferably an alkaline solution, and more preferably an organic alkaline solution or an aqueous solution of an alkaline compound. An organic solvent may also be used as the developer.

[0265] After patterning by wet etching, it is preferable to further rinse with a rinse solution. Also, after patterning by simultaneous opening during development of the photoresist, it is preferable to further rinse with a rinse solution. The rinse solution is preferably water, an aqueous solution of an alcohol, an aqueous solution of an ester, an aqueous solution of an acidic compound, or an organic solvent, and more preferably water.

[0266] <(III) Method of Contacting with a Solution of a Specific Compound> The first electrode in the display device of the present invention can be formed by contacting the first electrode with a solution containing the compound (I) described below, which is a compound containing elemental sulfur, chlorine, or bromine. The (III) method of contacting with a solution of a specific compound is a method of surface-modifying the surface of the first electrode with elemental sulfur, chlorine, or bromine. The display device of the present invention can be manufactured by forming a pixel dividing layer using a photosensitive composition or a non-photosensitive composition on the first electrode formed by this method. The solution of the compound containing elemental sulfur, chlorine, or bromine preferably further contains a solvent. Examples of the solvent include the compounds described below.

[0267] Examples of methods for contacting the first electrode with a solution of a compound containing elemental sulfur, chlorine, or bromine include: (1) a method of applying the solution of a compound containing elemental sulfur, chlorine, or bromine onto the first electrode; (2) a method of spraying the solution of a compound containing elemental sulfur, chlorine, or bromine onto the first electrode in the form of a mist; or (3) a method of immersing the first electrode in a solution of a compound containing elemental sulfur, chlorine, or bromine.

[0268] After the solution of the compound containing elemental sulfur, elemental chlorine, or elemental bromine is brought into contact with the first electrode, the first electrode is preferably further washed with a rinse solution, which is preferably water, an aqueous solution of an alcohol, an aqueous solution of an ester, an aqueous solution of an acidic compound, or an organic solvent, and more preferably water.

[0269] <(IV) Method of Contacting with Gas of Specific Compound> The first electrode in the display device of the present invention can be formed by gasifying the compound (I) described below, which is a compound containing elemental sulfur, elemental chlorine, or elemental bromine, and contacting it with the first electrode. The (IV) method of contacting with gas of specific compound is a method of surface-modifying the surface of the first electrode with elemental sulfur, elemental chlorine, or elemental bromine. The display device of the present invention can be manufactured by forming a pixel dividing layer using a photosensitive composition or a non-photosensitive composition on the first electrode formed by this method.

[0270] Examples of methods for gasifying a compound containing sulfur, chlorine, or bromine and contacting it with the first electrode include: (1) a method in which a compound containing sulfur, chlorine, or bromine is gasified and filled into a container and contacted with the first electrode; (2) a method in which a compound containing sulfur, chlorine, or bromine is gasified and sprayed onto the first electrode and contacted with the first electrode; or (3) a method in which a compound containing sulfur, chlorine, or bromine is gasified and filled into a container and a film is formed on the first electrode by chemical vapor deposition.

[0271] <(V) Method of Contacting with Ions of a Specific Compound> The first electrode in the display device of the present invention can be formed by ionizing the (I) compound described below, which is a compound containing elemental sulfur, elemental chlorine, or elemental bromine, and contacting it with the first electrode. (IV) The method of contacting with ions of a specific compound is a method of surface-modifying the surface of the first electrode with elemental sulfur, elemental chlorine, or elemental bromine. The display device of the present invention can be manufactured by forming a pixel dividing layer using a photosensitive composition or a non-photosensitive composition on the first electrode formed by this method.

[0272] Examples of methods for ionizing a compound containing sulfur, chlorine, or bromine and contacting it with the first electrode include: (1) a method in which a compound containing sulfur, chlorine, or bromine is gasified and filled into a container, ionized by electromagnetic waves, and contacted with the first electrode; or (2) a method in which a compound containing sulfur, chlorine, or bromine is gasified, ionized by electromagnetic waves, and accelerated by application of a bias to cause it to collide with the first electrode.

[0273] <Cured Films of Non-Photosensitive Composition and Photosensitive Composition> In the display device of the present invention, the pixel dividing layer, pixel dimension control layer, spacer layer, sealing layer, color filter layer, black matrix layer, overcoat layer, TFT planarizing layer, TFT protective layer, and interlayer insulating layer are preferably cured films obtained by curing a non-photosensitive composition, and more preferably cured films obtained by curing a photosensitive composition. The non-photosensitive composition and the photosensitive composition preferably contain the components shown below.

[0274] Curing refers to the formation of a crosslinked structure by a reaction, resulting in the loss of fluidity of the film, or the state in which this occurs. The reaction may be, but is not limited to, heating, energy beam irradiation, or the like, but is preferably performed by heating. The state in which a crosslinked structure is formed by heating and the film loses its fluidity is called thermal curing. Heating conditions include, for example, heating at 150 to 500°C for 5 to 300 minutes. Heating methods include, for example, heating using an oven, a hot plate, infrared radiation, a flash annealing device, or a laser annealing device. Treatment atmospheres include, for example, air, oxygen, nitrogen, helium, neon, argon, krypton, or xenon atmospheres; gas atmospheres containing 1 to 10,000 ppm by mass (0.0001 to less than 1% by mass) of oxygen; gas atmospheres containing 10,000 ppm by mass (1% by mass) or more of oxygen; and vacuum.

[0275] <Non-photosensitive composition and photosensitive composition> The photosensitive composition of the third embodiment of the present invention will be described below. The non-photosensitive composition and photosensitive composition of other embodiments of the present invention will also be described. When the term "non-photosensitive composition" or "photosensitive composition" is used in the present invention, it refers to the photosensitive composition of the third embodiment of the present invention, or the non-photosensitive composition or photosensitive composition that forms the cured film provided in the display device of the first embodiment or the second embodiment of the present invention. When the term "composition of the present invention" is used, it refers to all of these compositions. On the other hand, when a composition of a specific embodiment is described, it will be referred to as the photosensitive composition of the third embodiment of the present invention, etc.

[0276] A photosensitive composition according to a third aspect of the present invention is a photosensitive composition containing (A) an alkali-soluble resin, (C) a photosensitizer, and (D) a colorant, and satisfies the following condition (I) and / or condition (II): (I) The photosensitive composition further contains one or more components selected from the group consisting of a component containing elemental sulfur, a component containing elemental chlorine, and a component containing elemental bromine, and satisfies the following conditions (1a) and / or (2a): (1a) The content of elemental sulfur in the photosensitive composition is 0.01 to 100 ppm by mass; (2a) The total content of elemental chlorine and elemental bromine in the photosensitive composition is 0.01 to 100 ppm by mass; (II) The photosensitive composition further contains one or more components selected from the group consisting of the following components containing sulfur-based anions and the following components containing halogen anions, and satisfies the following conditions (1b) and / or (2b): Sulfur-based anion: one or more ions selected from the group consisting of sulfide ion, hydrogen sulfide ion, sulfate ion, and hydrogen sulfate ion; Halogen anion: chloride ion and / or bromide ion (1b) The total content of sulfide ions, hydrogen sulfide ions, sulfate ions, and hydrogen sulfate ions in the photosensitive composition is 0.01 to 500 ppm by mass. (2b) The total content of chloride ions and bromide ions in the photosensitive composition is 0.01 to 500 ppm by mass.

[0277] By adopting such a configuration, the photosensitive composition of the present invention can provide a cured film that combines excellent light-emitting properties that allow low-voltage operation and high reliability of the light-emitting device. By incorporating a trace amount of a component containing elemental sulfur, a component containing the above-mentioned sulfur-based anion, a component containing elemental chlorine, a component containing elemental bromine, or a component containing the above-mentioned halogen anion into the photosensitive composition, it is believed that when a pattern of the photosensitive composition is formed on the first electrode, the surface of the light-emitting layer side of the first electrode corresponding to the openings of the pixel dividing layer portion or the pixel dimension control layer portion is surface-modified by these elements or ions. Furthermore, after forming a pattern of the photosensitive composition, it is believed that the transition of these elements or ions contained in the pixel dividing layer results in the surface modification of the surface of the first electrode by these elements or ions. As a result, it is believed that adjustment of the work function difference will achieve excellent light-emitting properties that allow low-voltage operation. In addition, it is believed that high light-emitting brightness at the same driving voltage will be achieved. Furthermore, it is believed that intentionally incorporating trace amounts of these components will control the polarization structure and charge balance in the pixel dividing layer of, for example, an organic EL display. This is believed to contribute to the high reliability of the light-emitting device by suppressing ion migration and electromigration caused by metal impurities and ion impurities that adversely affect the light-emitting characteristics. Also, it is believed that the suppression of migration and aggregation of metals in the first electrode contributes to the high reliability of the light-emitting device.

[0278] <(A) Alkali-Soluble Resin> The composition of the present invention contains (A) an alkali-soluble resin. (A) An alkali-soluble resin refers to a resin that has an acidic group and is soluble in an alkaline developer. The (A) alkali-soluble resin in the photosensitive composition is preferably a resin that has a solubility that allows the photosensitive composition to be imparted with positive or negative photosensitivity by the (C) photosensitizer described below and that can form a positive or negative pattern by development with an alkaline developer. (A) The alkali-soluble resin more preferably has an acidic group in the structural unit of the resin.

[0279] The composition of the present invention contains (A) an alkali-soluble resin and further contains a component containing sulfur element, a component containing sulfur-based anion, a component containing chlorine element, a component containing bromine element, or a component containing halogen anion, as described below, and by setting the contents of the sulfur element, sulfur-based anion, chlorine element, bromine element, and halogen anion, as described below, within specific ranges, the composition achieves the effects of excellent light-emitting properties that can be driven at a low voltage and high reliability of the light-emitting device. With this configuration, even if the alkali-soluble resin (A) contains unintended impurities, it is possible to improve the light-emitting properties at a high voltage and to suppress a decrease in the reliability of the light-emitting device due to the impurities.

[0280] By including the alkali-soluble resin (A), the resin structure of the alkali-soluble resin (A) is introduced into the cured film of the photosensitive composition, improving heat resistance and suppressing outgassing from the pixel dividing layer, etc. As a result, deterioration of the light-emitting element is suppressed, and the effect of improving the reliability of the light-emitting element is remarkable.

[0281] From the viewpoint of achieving low-voltage operation of the light-emitting characteristics and improving the luminance, the (A) alkali-soluble resin preferably has a phenolic hydroxyl group, and more preferably has a phenolic hydroxyl group in the structural unit of the resin. It is believed that the inclusion of the (A) alkali-soluble resin having a phenolic hydroxyl group promotes the surface modification action on the light-emitting layer side surface of the first electrode corresponding to the opening of the pixel dividing layer section or the opening of the pixel dimension control layer section. Therefore, it is believed that adjusting the work function difference promotes low-voltage operation of the light-emitting characteristics. As a result, it is believed that the effect of improving the luminance when driven at the same voltage becomes significant.

[0282] From the viewpoint of improving the reliability of the light-emitting element, the alkali-soluble resin (A) preferably has a radical polymerizable group, and more preferably has a radical polymerizable group in the structural unit of the resin. By incorporating the alkali-soluble resin (A) having a radical polymerizable group, a crosslinked structure is introduced in which a radical polymerizable group such as a (meth)acryloyl group is radically polymerized, so that the cured film of the photosensitive composition has a remarkable effect of improving heat resistance due to an improved crosslink density. As a result, outgassing from the pixel dividing layer, etc. is suppressed, and it is presumed that the effect of improving the reliability of the light-emitting element is remarkable.

[0283] From the viewpoints of lowering the voltage required for driving the light-emitting characteristics, improving the luminance, and improving the reliability of the light-emitting device, the (A) alkali-soluble resin preferably contains a resin having a radical polymerizable group and a resin not having a radical polymerizable group. In the case of a positive-type photosensitive composition, by adding an (A) alkali-soluble resin not having a radical polymerizable group, the amount of double bond groups in the photosensitive composition can be controlled, and it is presumed that the alkali solubility is improved by the interaction between the double bond groups in the photosensitive composition and the aromatic ring of the (C) photosensitizer described below. On the other hand, in the case of a negative-type photosensitive composition, by adding an (A) alkali-soluble resin not having a radical polymerizable group, it is presumed that excessive photocuring is controlled, thereby suppressing the generation of residues. Therefore, it is thought that in surface modification using sulfur element, the above-mentioned sulfur-based anions, chlorine element, bromine element, or the above-mentioned halogen anions, it is possible to suppress the inhibition of surface modification due to the generation of residues on the surface of the first electrode.

[0284] The radical polymerizable group is preferably an ethylenically unsaturated double bond group. The radical polymerizable group is more preferably one or more selected from the group consisting of a photoreactive group, an alkenyl group having 2 to 5 carbon atoms, and an alkynyl group having 2 to 5 carbon atoms. The photoreactive group is preferably a styryl group, a cinnamoyl group, a maleimide group, a nadimide group, or a (meth)acryloyl group, more preferably a (meth)acryloyl group. On the other hand, the alkenyl group having 2 to 5 carbon atoms or the alkynyl group having 2 to 5 carbon atoms is preferably a vinyl group, an allyl group, a 2-methyl-2-propenyl group, a crotonyl group, a 2-methyl-2-butenyl group, a 3-methyl-2-butenyl group, a 2,3-dimethyl-2-butenyl group, an ethynyl group, or a 2-propargyl group, more preferably a vinyl group or an allyl group.

[0285] <(A) Alkali-Soluble Resin: (A1) Resin, (A2) Resin, and (A3) Resin> In the composition of the present invention, the alkali-soluble resin (A) preferably contains the following (A1) resin and / or (A3) resin. (A1) Resin: Resin having structural units containing one or more selected from the group consisting of imide structures, amide structures, oxazole structures, and siloxane structures. (A3) Resin: Resin having a phenolic hydroxyl group. The (A1) resin preferably has one or more structural units selected from the group consisting of imide structures, amide structures, oxazole structures, and siloxane structures. The (A3) resin preferably has a phenolic hydroxyl group in at least one of the main chain, side chain, and terminal of the resin, and more preferably has a phenolic hydroxyl group in the structural unit of the resin.

[0286] This configuration significantly improves the light-emitting characteristics by lowering the driving voltage, improving the light-emitting brightness, and improving the reliability of the light-emitting device. It is believed that the (A1) resin and the (A3) resin promote surface modification on the light-emitting layer-side surface of the first electrode, which corresponds to the opening of the pixel dividing layer or the opening of the pixel dimension control layer. Therefore, it is believed that adjusting the work function difference promotes the light-emitting characteristics by lowering the driving voltage. As a result, it is believed that the effect of improving the light-emitting brightness when driven at the same voltage is significantly improved. In addition, the excellent heat resistance of the imide structure, amide structure, oxazole structure, or siloxane structure of the (A1) resin, or the aromatic ring skeleton of the (A3) resin, suppresses outgassing from the pixel dividing layer, etc., and is therefore believed to significantly improve the reliability of the light-emitting device.

[0287] Note that among (A1) resin, (A3) resin, and the (A2) resin described below, if each of these has a structure or group that constitutes another resin, it will be classified into one of the following categories according to the following rules. (A2) Resin: Resin Having a Radically Polymerizable Group When a resin can fall into two or more of (A1), (A2), and (A3), the classification is determined as follows. That is, if a resin has a structural unit containing one or more selected from the group consisting of an imide structure, an amide structure, an oxazole structure, and a siloxane structure (hereinafter simply referred to as an "imide structure or other structural unit") and does not have a radically polymerizable group, but has a phenolic hydroxyl group, the resin is considered to be an (A1) resin. Furthermore, if a resin having a structural unit such as an imide structure has a radically polymerizable group and does not have a phenolic hydroxyl group, the resin is considered to be an (A2) resin. On the other hand, when a resin having a radical polymerizable group but no structural unit such as an imide structure has a phenolic hydroxyl group, the resin is considered to be an (A3) resin, and when a resin having a structural unit such as an imide structure has a radical polymerizable group and further has a phenolic hydroxyl group, the resin is considered to be an (A2) resin.

[0288] The resin obtained by curing the (A1) resin is preferably the (A1-DL) resin in the pixel division layer etc. described above. The resin obtained by curing the (A2) resin is preferably the (A2-DL) resin in the pixel division layer etc. described above. The resin obtained by curing the (A3) resin is preferably the (A3-DL) resin in the pixel division layer etc. described above.

[0289] From the viewpoints of achieving lower-voltage operation of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device, the (A1) resin preferably contains one or more resins selected from the group consisting of the following (A1-1) resin, (A1-2) resin, (A1-3) resin, (A1-4) resin, (A1-5) resin, (A1-6) resin, and (A1-7) resin. The (A1) resin more preferably contains one or more resins selected from the group consisting of the following (A1-1) resin, (A1-2) resin, (A1-3) resin, (A1-4) resin, (A1-5) resin, and (A1-6) resin, and even more preferably contains the (A1-1) resin and / or the (A1-5) resin. The (A1) resin may be either a single resin or a copolymer thereof. (A1-1) Resin: Polyimide (A1-2) Resin: Polyimide precursor (A1-3) Resin: Polybenzoxazole (A1-4) Resin: Polybenzoxazole precursor (A1-5) Resin: Polyamideimide (A1-6) Resin: Polyamideimide precursor (A1-7) Resin: Polysiloxane.

[0290] From the viewpoints of achieving lower-voltage operation of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device, the (A3) resin preferably contains one or more resins selected from the group consisting of the following (A3-1) resin, (A3-2) resin, (A3-3) resin, and (A3-4) resin. The (A3) resin more preferably contains the (A3-1) resin and / or the (A3-3) resin, and even more preferably contains the (A3-1) resin. The (A3) resin may be a single resin or a copolymer thereof. (A3-1) resin: phenolic resin; (A3-2) resin: polyhydroxystyrene; (A3-3) resin: phenolic group-containing epoxy resin; and (A3-4) resin: phenolic group-containing acrylic resin.

[0291] The alkali-soluble resin (A) preferably contains the following (A2) resin. The alkali-soluble resin (A) more preferably contains the (A1) resin and / or the (A3) resin, and further contains the following (A2) resin. The alkali-soluble resin (A) more preferably contains the (A1) resin and the (A2) resin, and particularly preferably contains the (A1) resin, the (A3) resin, and the (A2) resin. (A2) resin: a resin having a radically polymerizable group.

[0292] By adopting such a configuration, the effect of improving the reliability of the light-emitting element becomes significant. The (A2) resin is a resin having a radically polymerizable group such as a (meth)acryloyl group. By containing the (A2) resin, a crosslinked structure is introduced into the cured film of the photosensitive composition through radical polymerization of the radically polymerizable group such as a (meth)acryloyl group, thereby significantly improving the crosslink density. It is presumed that the excellent heat resistance of such a crosslinked structure suppresses outgassing from the pixel dividing layer, etc., thereby significantly improving the reliability of the light-emitting element.

[0293] From the viewpoints of achieving lower-voltage operation of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device, the (A2) resin preferably contains one or more resins selected from the group consisting of the following (A2-a) resin, (A2-b) resin, (A2-c) resin, (A2-d) resin, (A2-e) resin, (A2-f) resin, (A2-g) resin, (A2-1) resin, (A2-2) resin, and (A2-3) resin. The (A2) resin more preferably contains one or more resins selected from the group consisting of (A2-a) resin, (A2-b) resin, (A2-c) resin, (A2-d) resin, (A2-e) resin, (A2-f) resin, and (A2-g) resin, and further preferably contains one or more resins selected from the group consisting of (A2-a) resin, (A2-b) resin, (A2-c) resin, (A2-d) resin, (A2-e) resin, and (A2-f) resin. From the viewpoints of achieving lower driving voltages for light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device, the (A2) resin preferably contains one or more resins selected from the group consisting of (A2-a) resin, (A2-b) resin, (A2-c) resin, (A2-d) resin, (A2-e) resin, (A2-f) resin, and (A2-g) resin, and more preferably contains one or more resins selected from the group consisting of (A2-1) resin, (A2-2) resin, and (A2-3) resin. The (A2) resin may be a single resin or a copolymer thereof. (A2-a) Resin: Unsaturated group-containing polyimide (A2-b) Resin: Unsaturated group-containing polyimide precursor (A2-c) Resin: Unsaturated group-containing polybenzoxazole (A2-d) Resin: Unsaturated group-containing polybenzoxazole precursor (A2-e) Resin: Unsaturated group-containing polyamideimide (A2-f) Resin: Unsaturated group-containing polyamideimide precursor (A2-g) Resin: Unsaturated group-containing polysiloxane (A2-1) Resin: Polycyclic side chain-containing resin (A2-2) Resin: Acid-modified epoxy resin (A2-3) Resin: Acrylic resin.

[0294] <(A) Alkali-Soluble Resin; (A3a) Resin and (A3b) Resin> From the viewpoint of improving the reliability of the light-emitting device, it is also preferable that the (A) alkali-soluble resin in the composition of the present invention contains the following (A3b) resin. The (A3b) resin preferably has a phenolic hydroxyl group in at least one of the main chain, side chain, and terminal of the resin, and has a radically polymerizable group in at least one of the side chain and terminal of the resin. (A3b) Resin: A resin of the (A3) resin that has a phenolic hydroxyl group and a radically polymerizable group.

[0295] The double bond equivalent of the resin (A3b) is preferably 500 g / mol or more, more preferably 700 g / mol or more, and even more preferably 1,000 g / mol or more from the viewpoints of suppressing narrow mask bias and improving halftone characteristics after development, while the double bond equivalent is preferably 3,000 g / mol or less, more preferably 2,000 g / mol or less, and even more preferably 1,500 g / mol or less from the viewpoints of improving sensitivity during exposure and improving the reliability of the light-emitting device.

[0296] From the viewpoints of achieving lower driving voltages and improving luminance, the composition of the present invention also preferably contains the following (A3a) resin as the alkali-soluble resin (A). The (A3a) resin preferably has a phenolic hydroxyl group in at least one of the main chain, side chain, and terminal of the resin. (A3a) resin: A resin among the (A3) resins that has a phenolic hydroxyl group and does not have a radically polymerizable group.

[0297] From the viewpoints of achieving lower driving voltages for light-emitting properties, improving light-emitting brightness, and improving the reliability of the light-emitting device, it is preferred that the alkali-soluble resin (A) contains a resin (A3b) and that the alkali-soluble resin (A) further contains a resin (A3a).

[0298] <Acidic Group> The (A1) resin and the (A2) resin have an acidic group in at least one of the resin main chain, the resin side chain, and the resin terminal. Furthermore, the (A1) resin and the (A2) resin having the above-mentioned structural unit such as an imide structure preferably have the following weak acidic group (WA) as the acidic group, more preferably a phenolic hydroxyl group or a silanol group, and even more preferably a phenolic hydroxyl group, from the viewpoint of suppressing narrow mask bias and improving halftone characteristics after development. On the other hand, the (A1) resin and the (A2) resin preferably have a carboxy group, a carboxylic acid anhydride group, or a sulfonic acid group as the acidic group, more preferably a carboxy group or a carboxylic acid anhydride group, from the viewpoint of suppressing residue after development. The (A1) resin and the (A2) resin preferably have a weak acidic group (WA) as the acidic group, and also preferably have a carboxy group, a carboxylic acid anhydride group, or a sulfonic acid group. (WA) Weakly acidic group: one or more groups selected from the group consisting of a phenolic hydroxyl group, a hydroxyimide group, a hydroxyamide group, a silanol group, a 1,1-bis(trifluoromethyl)methylol group, and a mercapto group.

[0299] The acid equivalent of the (A1) resin is preferably 200 g / mol or more, more preferably 250 g / mol or more, and even more preferably 300 g / mol or more from the viewpoints of improving sensitivity during exposure and reliability of the light-emitting device, while the acid equivalent is preferably 600 g / mol or less, more preferably 500 g / mol or less, and even more preferably 450 g / mol or less from the viewpoints of suppressing residue after development, suppressing narrow mask bias after development, and improving halftone characteristics.

[0300] The acid equivalent of the (A2) resin is preferably 300 g / mol or more, more preferably 350 g / mol or more, and even more preferably 400 g / mol or more, from the viewpoints of improving sensitivity during exposure and reliability of the light-emitting device, while the acid equivalent is preferably 700 g / mol or less, more preferably 600 g / mol or less, and even more preferably 550 g / mol or less, from the viewpoints of suppressing residue after development, suppressing narrow mask bias after development, and improving halftone characteristics.

[0301] The (A3) resin has a phenolic hydroxyl group. The (A3) resin preferably has at least one of a structural unit having a phenolic hydroxyl group and a terminal structure having a phenolic hydroxyl group. Furthermore, from the viewpoints of suppressing narrow mask bias and improving halftone characteristics after development, the (A3) resin also preferably has a hydroxyimide group, a hydroxyamide group, a silanol group, a 1,1-bis(trifluoromethyl)methylol group, or a mercapto group. On the other hand, from the viewpoint of suppressing residues after development, the (A3) resin preferably further has a carboxy group, a carboxylic acid anhydride group, or a sulfonic acid group, and more preferably has a carboxy group or a carboxylic acid anhydride group.

[0302] The acid equivalent of the (A3) resin is preferably 70 g / mol or more, more preferably 80 g / mol or more, and even more preferably 90 g / mol or more from the viewpoints of improving sensitivity during exposure and reliability of the light-emitting device, while the acid equivalent is preferably 450 g / mol or less, more preferably 350 g / mol or less, and even more preferably 300 g / mol or less from the viewpoints of suppressing residue after development, suppressing narrow mask bias after development, and improving halftone characteristics.

[0303] <(A) Alkali-Soluble Resin; Polyimide and Polyimide Precursor> The polyimide resins (A1-1) and (A2-a) will be described collectively below. Similarly, the polyimide precursors (A1-2) and (A2-b) will be described collectively below. Examples of polyimide precursors include resins obtained by reacting a tetracarboxylic acid or a corresponding tetracarboxylic dianhydride with a diamine or a diisocyanate compound. Other examples of polyimide precursors include polyamic acid, polyamic acid ester, polyamic acid amide, and polyisoimide. Examples of polyimides include resins obtained by dehydrating and cyclizing a polyimide precursor by heating or using a catalyst. Polyimides and polyimide precursors may also be copolymers with polyamides, obtained by further using a dicarboxylic acid or a corresponding dicarboxylic acid activated diester in the resin synthesis reaction.

[0304] From the viewpoints of achieving low-voltage driving of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device, the polyimide preferably has a structural unit represented by general formula (1). The content ratio of the structural unit represented by general formula (1) to all structural units in the polyimide is preferably 50 to 100 mol %, more preferably 60 to 100 mol %, and even more preferably 70 to 100 mol %.

[0305] From the viewpoints of achieving low-voltage driving of light-emitting characteristics, improving light-emitting brightness, and improving the reliability of the light-emitting device, the polyimide precursor preferably has a structural unit represented by general formula (3). The content ratio of the structural unit represented by general formula (3) to all structural units in the polyimide precursor is preferably 50 to 100 mol %, more preferably 60 to 100 mol %, and even more preferably 70 to 100 mol %.

[0306]

[0307] In the general formula (1) and the general formula (3), R １ and R ９ R each independently represents a tetravalent to decavalent organic group. ２ and R １０ R each independently represents a divalent to decavalent organic group. ３ , R ４ , and R １３ R each independently represents a phenolic hydroxyl group, a sulfonic acid group, a mercapto group, or a substituent represented by general formula (7) or general formula (8). １１ represents a substituent represented by general formula (7) or general formula (8). １２ represents a phenolic hydroxyl group, a sulfonic acid group, or a mercapto group. p represents an integer of 0 to 6. q represents an integer of 0 to 8. t represents an integer of 2 to 8, u represents an integer of 0 to 6, and 2≦t+u≦8. v represents an integer of 0 to 8.

[0308] In the general formula (1) and the general formula (3), R １ , R ９ , R ２ , and R １０Preferably, each independently has an aliphatic structure having 2 to 20 carbon atoms, an alicyclic structure having 4 to 20 carbon atoms, or an aromatic structure having 6 to 30 carbon atoms. ３ or R ４ represents a phenolic hydroxyl group, R bonded to the phenolic hydroxyl group １ or R ２ contains an aromatic structure in its structure. １２ or R １３ represents a phenolic hydroxyl group, R bonded to the phenolic hydroxyl group ９ or R １０ contains an aromatic structure in its structure. q is preferably an integer of 1 to 8. v is preferably an integer of 1 to 8. R １ and R ９ is sometimes called a carboxylic acid residue. ２ and R １０ is sometimes called an amine residu...

Claims

1. A display device having an organic layer including a substrate, a first electrode, a second electrode, a pixel division layer, and a light-emitting layer, The pixel division layer contains a (D-DL) colorant, and the optical density at the wavelength of visible light per 1 μm of film thickness of the pixel division layer is 0.5 to 3.

0. In a planar view, it has multiple pixel sections, At a depth of 3 nm from the surface of the first electrode on the side of the pixel that is in contact with the organic layer containing the light-emitting layer, the following is measured by time-of-flight secondary ion mass spectrometry: Sulfur ions (S － The detection intensity of (S Ｄｅｐ／Ａｎｏｄｅ )counts, Chloride ion (Cl － The detection intensity of (Cl Ｄｅｐ／Ａｎｏｄｅ )counts, Bromine ions (Br － The detection intensity of (Br Ｄｅｐ／Ａｎｏｄｅ ) counts, and, When the sum of the (Cl Ｄｅｐ／Ａｎｏｄｅ ) and the (Br Ｄｅｐ／Ａｎｏｄｅ ) is taken as (X Ｄｅｐ／Ａｎｏｄｅ ), A display device that satisfies the relationship represented by general formula (SA-1) and / or the relationship represented by general formula (XA-1). 2≦(S Ｄｅｐ／Ａｎｏｄｅ )≦200 (SA-1) 2≦(8) Ｄｅｐ／Ａｎｏｄｅ )≦2000 (82-1)

2. The display device according to claim 1, satisfying the relationship represented by the general formula (SA-1) and the general formula (XA-1).

3. The first electrode is a non-transparent electrode with a multilayer structure, The first electrode has a non-transparent conductive metal layer, The display device according to claim 1, wherein at least one of the layers other than the outermost layer on the light-emitting layer side of the first electrode has an opaque conductive metal layer containing silver or copper as the main component element.

4. The first electrode has a transparent conductive oxide film layer and an opaque conductive metal layer, The display device according to claim 3, wherein the outermost layer on the light-emitting layer side of the first electrode has a transparent conductive oxide film layer containing indium as the main component element.

5. At a depth of 3 nm from the surface of the transparent conductive oxide film layer on the side of the pixel portion that is in contact with the organic layer including the light-emitting layer, the measurement is performed by time-of-flight secondary ion mass spectrometry. Indium oxide ion (InO ２ － The detection intensity of (InO Ｄｅｐ／Ａｎｏｄｅ When we use )counts, The relationship expressed by the general formula (SA-1) is satisfied, and furthermore, the relationship expressed by the general formula (SA-2) and the general formula (InSA-1) is satisfied. and / or, The display device according to claim 4, which satisfies the relationship represented by the general formula (XA-1), and further satisfies the relationships represented by the general formula (XA-2) and the general formula (InXA-1). 0.0001≦(S Ｄｅｐ／Ａｎｏｄｅ ) / (InO Ｄｅｐ／Ａｎｏｄｅ )≦0.1 (SA-2) 1,000≦([O Ｄｅｐ／Ａｎｏｄｅ )≦40,000 (Inb｡-1) 000011≦(8) Ｄｅｐ／Ａｎｏｄｅ / (9nO Ｄｅｐ／Ａｎｏｄｅ )≦00.1 (82-2) ,, , ≦ ( , ) Ｄｅｐ／Ａｎｏｄｅ ≦, 4, , !

6. Furthermore, the display device according to any one of claims 1 to 5 satisfies the relationship represented by general formula (SA-1a) and / or the relationship represented by general formula (XA-1a). 2≦(S Ｄｅｐ／Ａｎｏｄｅ )≦100 (SA-1]) 2≦(8) Ｄｅｐ／Ａｎｏｄｅ )≦1000 (82-11)

7. In the region where the organic layer portion including the light-emitting layer on the pixel division layer portion is formed and does not overlap with the surface of the pixel division layer portion on the side in contact with the second electrode portion or on the side exposed at the opening of the second electrode portion, the sum of the negative ion detection intensities measured by time-of-flight secondary ion mass spectrometry is as follows: Sulfur ions (S － The ratio of the detection intensities of (S ＰＤＬ )year, Chloride ion (Cl － The ratio of the detection intensities of (Cl ＰＤＬ )year, Bromine ions (Br － The ratio of the detection intensity of (Br ＰＤＬ ) and, (Cl ＰＤＬ ) and the (Br ＰＤＬ The sum of ) is (X ＰＤＬ )year, In the aforementioned pixel portion, on the surface of the first electrode portion that is in contact with the organic layer portion including the light-emitting layer, a portion of the total negative ion detection intensity measured by time-of-flight secondary ion mass spectrometry is, Sulfur ions (S － The ratio of the detection intensities of (S Ａｎｏｄｅ )year, Chloride ion (Cl － The ratio of the detection intensities of (Cl Ａｎｏｄｅ )year, Bromine ions (Br － The ratio of the detection intensity of (Br Ａｎｏｄｅ ) and, (Cl Ａｎｏｄｅ ) and the (Br Ａｎｏｄｅ The sum of ) is (X Ａｎｏｄｅ ) When this is the case, A display device according to any one of claims 1 to 5, satisfying the relationship represented by general formula (SD-1) and / or the relationship represented by general formula (XD-1). 0.1≦(S Ａｎｏｄｅ ) / (S ＰＤＬ )≦20 (SD-1) 0.1≦(X Ａｎｏｄｅ ) / (X ＰＤＬ )≦20 (XD-1)

8. The aforementioned pixel division layer contains an organic black pigment and / or a mixture of two or more colored pigments, The organic black pigment comprises one or more selected from the group consisting of benzofuranone-based black pigments, perylene-based black pigments, and azo-based black pigments. The display device according to any one of claims 1 to 5, wherein the mixture of two or more colored pigments comprises two or more pigments selected from the group consisting of red, orange, yellow, green, blue, and purple.

9. The display device according to any one of claims 1 to 5, wherein the pixel division layer contains the following (A1-DL) resin and / or (A3-DL) resin. (A1-DL) resin: A resin having a structural unit that includes one or more selected from the group consisting of imide structure, amide structure, oxazole structure, and siloxane structure. (A3-DL) resin: A resin having a structural unit containing a phenolic hydroxyl group.

10. The display device according to any one of claims 1 to 5, wherein the pixel division layer comprises the following (C1x-DL) compound and / or (C2x-DL) compound. (C1x-DL) compounds: Compounds having a fluorene structure, a benzofluorene structure, a dibenzofluorene structure, a carbazole structure, a benzocarbazole structure, an indole structure, a benzoindole structure, or a diphenyl sulfide structure, with an imino group attached to these structures and / or a carbonyl group attached to these structures. (C2x-DL) compounds: Compounds having a carboxylic acid ester structure containing an indene structure and / or an aryl sulfonate ester structure containing an indene structure.

11. The first electrode is a non-transparent electrode with a multilayer structure, wherein the first electrode has a non-transparent conductive metal layer. At least one of the layers other than the outermost layer on the light-emitting layer side of the first electrode has an opaque conductive metal layer containing silver or copper as the main component element. The display device according to any one of claims 1 to 5, wherein the non-transparent conductive metal layer in the first electrode, which contains silver or copper as a main component element, further contains one or more elements selected from the group consisting of In, Sn, Zn, Al, Ga, Bi, Nd, Ni, Mn, Na, K, Mg, Ca, C, and Si as elements different from the main component element.

12. The substrate is a flexible substrate, The structure has the aforementioned pixel division layer stacked on a flexible substrate, The light extraction side of the organic layer including the light-emitting layer does not have a linear polarizer, a quarter-wave plate, and a circular polarizer. A display device according to any one of claims 1 to 5, having a curved display section, a display section including an outwardly foldable surface, or a display section including an inwardly foldable surface, and being a flexible display device.

13. The pixel division layer includes a cured pattern having a stepped shape, The thickness of the thick film portion in the stepped shape of the hardened pattern of the pixel division layer is (T ＦＴ The thickness of the thin film portion is set to (T) μm, and the thickness of the thin film portion is set to (T ＨＴ When it is μm, The (T ＦＴ ) μm and the (T ＨＴ ) Film thickness difference (ΔT) from μm ＦＴ－ＨＴ A display device according to any one of claims 1 to 5, wherein the μm is 0.5 to 10.0 μm.

14. The thick film portion and the thin film portion in the stepped shape of the hardened pattern of the pixel division layer contain the same (D-DL) coloring agent. The display device according to claim 13, wherein the optical density at the wavelength of visible light per 1 μm of film thickness of the thick film portion and the thin film portion is 0.5 to 3.

0.

15. The pixel division layer has a curing pattern, and a spacer layer is provided on a part of the pixel division layer. The thickness of the spacer layer (T ＳＰ ) μm is 0.5 to 10.0 μm, The display device according to any one of claims 1 to 5, wherein the spacer layer satisfies at least one of the following conditions (1) to (3). (1) The spacer layer does not contain (D-DL) colorants. (2) The spacer layer contains a (D-DL) colorant, and the optical density of the spacer layer at a wavelength of visible light per 1 μm of film thickness is 0.0 to 0.

3. (3) The spacer layer contains a compound having a carboxylic acid ester structure containing a (C2x-DL) indene structure and / or an aryl sulfonate ester structure containing an indene structure.

16. A display device having an organic layer including a substrate, a first electrode, a second electrode, a pixel division layer, and a light-emitting layer, The pixel division layer contains a (D-DL) colorant, and the optical density at the wavelength of visible light per 1 μm of film thickness of the pixel division layer is 0.5 to 3.

0. The pixel splitting layer contains one or more compounds selected from the group consisting of the following (I1a-DL) compounds, (I1b-DL) compounds, (I2a-DL) compounds, and (I2b-DL) compounds. The (I1a-DL) compound and the (I2a-DL) compound have the following (I-Ia) structure, The (I1b-DL) compound and the (I2b-DL) compound have the following (I-Ib) structure, A display device that satisfies one or more of the following conditions (1a-DL) and (1b-DL), or one or more of the following conditions (2a-DL) and (2b-DL). (I1a-DL) compound: One or more compounds selected from the group consisting of thiol structure-containing compounds, sulfide structure-containing compounds, disulfide structure-containing compounds, sulfoxide structure-containing compounds, sulfone structure-containing compounds, sultone structure-containing compounds, thiophene structure-containing compounds, and sulfonic acid structure-containing compounds. (I1b-DL) compound: Having one or more anion species selected from the group consisting of sulfide ion structure, hydrogen sulfide ion structure, sulfate ion structure, and bisulfate ion structure, Compounds having an ammonium ion structure, primary ammonium ion structure, secondary ammonium ion structure, tertiary ammonium ion structure, or quaternary ammonium ion structure as a cationic species. (I2a-DL) compound: One or more compounds selected from the group consisting of alkyl chloride structure-containing compounds, cycloalkyl chloride structure-containing compounds, aryl chloride structure-containing compounds, alkyl bromide structure-containing compounds, cycloalkyl bromide structure-containing compounds, and aryl bromide structure-containing compounds. (I2b-DL) compound: As an anionic species, it has a chloride ion structure and / or a bromide ion structure, Compounds having an ammonium ion structure, primary ammonium ion structure, secondary ammonium ion structure, tertiary ammonium ion structure, or quaternary ammonium ion structure as a cationic species. (I-Ia) Structure: A structure comprising one or more groups selected from the group consisting of a 1-2 valent aliphatic group having 4-30 carbon atoms, an alkylaryl group having 10-30 carbon atoms, an arylalkyl group having 10-30 carbon atoms, and an aryl group having 7-15 carbon atoms. (I-Ib) Structure: A structure comprising one or more groups selected from the group consisting of a 1-6 carbon-1 to 2 valent aliphatic group, a 10-30 carbon-1 alkylaryl group, a 10-30 carbon-1 arylalkyl group, and a 7-15 carbon-1 aryl group. (1a-DL) Sulfur element content in the pixel splitting layer is 0.01 to 500 ppm by mass. (1b-DL) The total content of sulfide ions, hydrogen sulfide ions, sulfate ions, and bisulfate ions in the pixel splitting layer is 0.01 to 1,000 ppm by mass. (2a-DL) The total content of chlorine and bromine elements in the pixel splitting layer is 0.01 to 500 ppm by mass. The total content of chloride ions and bromide ions in the (2b-DL) pixel splitting layer is 0.01 to 1,000 ppm by mass.

17. A photosensitive composition comprising (A) an alkali-soluble resin, (C) a photosensitive agent, and (D) a coloring agent, wherein the photosensitive composition satisfies the following conditions (I) and / or (II). (I) Furthermore, it contains one or more components selected from the group consisting of components containing sulfur, components containing chlorine, and components containing bromine, and satisfies the following conditions (1a) and / or (2a). (1a) The sulfur element content in the photosensitive composition is 0.01 to 100 ppm by mass. (2a) The total content of chlorine and bromine elements in the photosensitive composition is 0.01 to 100 ppm by mass. (II) Furthermore, it contains one or more components selected from the group consisting of the following sulfur-based anions and the following halogen anions, and satisfies the following conditions (1b) and / or (2b). Sulfur anions: One or more ions selected from the group consisting of sulfide ions, hydrogen sulfide ions, sulfate ions, and bisulfate ions. Halogen anions: Chloride ions and / or bromide ions (1b) The total content of sulfide ions, hydrogen sulfide ions, sulfate ions, and bisulfate ions in the photosensitive composition is 0.01 to 500 ppm by mass. (2b) The total content of chloride ions and bromide ions in the photosensitive composition is 0.01 to 500 ppm by mass.

18. A component containing the aforementioned sulfur element, and satisfying the conditions of (1a), and / or A component containing the aforementioned sulfur-based anion and satisfying the conditions of (1b), and, It contains one or more components selected from the group consisting of the chlorine element component and the bromine element component, and satisfies the conditions of (2a), and / or The photosensitive composition according to claim 17, comprising a component containing the halogen anion and satisfying the conditions of (2b).

19. The photosensitive composition according to claim 17 or 18, further comprising a compound represented by general formula (21) and / or a compound represented by general formula (22), and satisfying the following condition (6). (6) The total content of the compound represented by general formula (21) and the compound represented by general formula (22) in the photosensitive composition is 0.001 to 1.0% by mass. 【Chemistry 1】 (In general formulas (21) and (22), R 51 to R 53 each independently represent an alkyl group having 1 to 6 carbon atoms. R 54 and R 55 each independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.)

20. The photosensitive composition according to claim 17 or 18, further comprising one or more selected from the group consisting of benzene, toluene, xylene, and naphthalene, and satisfying the following condition (5). (5) The total content of benzene, toluene, xylene, and naphthalene in the photosensitive composition is 0.01 to 100 ppm by mass.

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