Display device

Abstract

The invention relates to a display device. The display device includes a base layer, a circuit layer disposed on the base layer, a display element layer disposed on the circuit layer and including a light emitting element, and an optical layer disposed on the display element layer. The light-emitting elements include a first light-emitting element overlapping the first light-emitting region and including a first light-emitting layer, a second light-emitting element overlapping the second light-emitting region and including a second light-emitting layer, and a third light-emitting element overlapping the third light-emitting region and including a third light-emitting layer, the first and second light emitting layers include first and second quantum dots, respectively, and the third light emitting layer includes an organic light emitting material, and the optical layer includes a first color filter overlapping the first light emitting region, a second color filter overlapping the second light emitting region, and a third color filter overlapping the third light emitting region and including scattering particles.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims priority to and the benefit of Korean Patent Application No. 10-2023-0139423, filed on October 18, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure herein relates to a display device, and more particularly to a display device having improved light emitting characteristics and reliability. Background Art

[0004] Various display devices are being developed for multimedia devices such as televisions, smartphones, tablet computers, navigation systems, or game consoles. These display devices use so-called self-luminous display elements that realize display by emitting light from a light-emitting material containing an organic compound.

[0005] In addition, in order to improve color purity and color reproducibility of display devices, light-emitting elements using quantum dots as light-emitting materials are being developed, and there is a need to improve the life span and light-emitting efficiency of light-emitting elements using quantum dots. Summary of the invention

[0006] The present disclosure provides a display device having improved light emitting characteristics, color purity, and color reproducibility.

[0007] An embodiment provides a display device, which includes a substrate layer, a circuit layer arranged on the substrate layer, a display element layer arranged on the circuit layer and including light-emitting elements, and an optical layer arranged on the display element layer, wherein the light-emitting elements include a first light-emitting element overlapping with a first light-emitting area and including a first light-emitting layer, a second light-emitting element overlapping with a second light-emitting area and including a second light-emitting layer, and a third light-emitting element overlapping with a third light-emitting area and including a third light-emitting layer, the first light-emitting layer and the second light-emitting layer include first quantum dots and second quantum dots, respectively, and the third light-emitting layer includes an organic light-emitting material, and the optical layer includes a first color filter overlapping with the first light-emitting area, a second color filter overlapping with the second light-emitting area, and a third color filter overlapping with the third light-emitting area and including scattering particles.

[0008] In an embodiment, the scattering particles may include at least one of zinc oxide, titanium oxide, and silicon oxide.

[0009] In an embodiment, the third color filter may include a scattering portion disposed on the display element layer and including scattering particles; and a filter portion disposed on the scattering portion and including a colorant.

[0010] In an implementation, the scattering portion may further include a polymer photosensitive resin, and the scattering particles may be distributed in the polymer photosensitive resin.

[0011] In an embodiment, the display element layer may further include an encapsulation layer covering the light emitting element, and the scattering portion may be in contact with the encapsulation layer.

[0012] In an embodiment, the filter portion may be disposed directly on the scattering portion.

[0013] In an implementation, the scattering portion may have a thickness in the range of about 1 μm to about 4 μm.

[0014] In an embodiment, the first color filter may include a red pigment or a red dye, the second color filter may include a green pigment or a green dye, and the colorant included in the filter part may include a blue pigment or a blue dye.

[0015] In an implementation, the optical layer may further include light blocking portions respectively disposed between the first color filter, the second color filter, and the third color filter.

[0016] In an embodiment, the optical layer may further include an overcoat layer disposed on the first to third color filters.

[0017] In an embodiment, the first to third light emitting elements may generate first to third lights, respectively, and the third light may be blue light having a central wavelength within a range of about 420 nm to about 480 nm.

[0018] In an embodiment, the first light emitting layer may include a first host and a first dopant, the second light emitting layer may include a second host and a second dopant, the first dopant may include a first quantum dot, and the second dopant may include a second quantum dot.

[0019] In an embodiment, the third light emitting layer may include a third host and a third dopant, and the third host and the third dopant may each include an organic light emitting material.

[0020] In an implementation, the third dopant may include a delayed fluorescence dopant.

[0021] In an embodiment, the light emitting element may include a first electrode, a light emitting layer disposed on the first electrode, and a second electrode disposed on the light emitting layer, and the light emitting layer may include a first light emitting layer, a second light emitting layer, and a third light emitting layer.

[0022] In an embodiment, the light emitting element may further include a capping layer disposed on the second electrode.

[0023] In an embodiment, the first light-emitting element may further include a first electron transport region disposed on the first light-emitting layer, the second light-emitting element may further include a second electron transport region disposed on the second light-emitting layer, and the first electron transport region and the second electron transport region may each include an inorganic material.

[0024] In an embodiment, the third light emitting element may further include a third electron transport region disposed on the third light emitting layer, and the third electron transport region may include an organic material.

[0025] In an embodiment, the third light-emitting layer may include a (3-1) light-emitting layer disposed on the first electrode and a (3-2) light-emitting layer disposed on the (3-1) light-emitting layer, and the third light-emitting element may further include a charge generation layer disposed between the (3-1) light-emitting layer and the (3-2) light-emitting layer.

[0026] In an embodiment, the display device includes a substrate layer, a circuit layer disposed on the substrate layer, a display element layer disposed on the circuit layer and including a light-emitting element, and an optical layer disposed on the display element layer, wherein the light-emitting element includes an organic light-emitting material, and the optical layer includes titanium dioxide (TiO 2 ) and a filter portion directly disposed on the scattering portion and comprising a pigment or dye. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The attached drawings are included to provide a further understanding of the embodiments described herein below, and are incorporated into and constitute a part of this specification. The drawings illustrate various embodiments and, together with the description, are used to explain the principles of the present disclosure. In the drawings, the size (e.g., thickness), proportions, and dimensions of the elements may be exaggerated for ease of description and clarity. Throughout the text, the same reference numerals and / or the same reference characters refer to the same elements. In the drawings:

[0028] Figure 1 A perspective view of a display device according to an embodiment constructed according to the principles of the present invention;

[0029] Figure 2 is a cross-sectional view of a display device according to an embodiment;

[0030] Figure 3 is an enlarged plan view partially illustrating a display device according to an embodiment;

[0031] Figure 4 is a cross-sectional view of a display device according to an embodiment; and

[0032] FIG. 5A to FIG. 5D Each of them is a cross-sectional view of a display device according to another embodiment. DETAILED DESCRIPTION

[0033] Hereinafter, embodiments will be described with reference to the accompanying drawings.

[0034] In this specification, when a component (or region, layer, part, etc.) is referred to as being "on" another component (or region, layer, part, etc.), "connected" or "coupled to" another component (or region, layer, part, etc.), this means that it is directly placed / connected / coupled on the other component (or region, layer, part, etc.) or a third component (or region, layer, part, etc.) may be disposed between them.

[0035] The same reference numerals or symbols refer to the same elements throughout the text. In addition, in the drawings, in order to effectively describe the technical content, the size (e.g., thickness), ratio and dimension of the components are exaggerated. "And / or" includes all combinations that can be defined by one or more related elements.

[0036] Terms such as first and second can be used to describe various components, but components should not be limited by these terms. These terms are only used to distinguish one component from other components. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component. Unless the context clearly indicates otherwise, a singular expression includes a plural expression.

[0037] In addition, terms such as "below", "below", "above", and "over" are used to describe the relationship between components shown in the drawings. These terms are relative concepts and are described based on the directions indicated in the drawings.

[0038] Terms such as “including” or “having” are intended to mark the existence of features, quantities, steps, operations, components, parts, or a combination thereof described in the specification, and should be understood as not excluding the possibility of the existence or addition of one or more other features, quantities, steps, operations, components, parts, or a combination thereof.

[0039] In the present application, "directly disposed" may mean that there is no added layer, film, region, plate, etc. between one part (such as a layer, film, region or plate) and another part (such as a layer, film, region or plate). For example, "directly disposed" may mean placing two layers or two members without using an additional member (such as an adhesive member) between them.

[0040] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this specification have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. In addition, terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the connotation in the relevant technical background, and unless explicitly defined herein, should not be interpreted as being too ideal or too formal.

[0041] In the specification, the term "substituted or unsubstituted" can describe a group substituted or unsubstituted by one or more substituents selected from the group consisting of: deuterium atoms, halogen atoms, cyano groups, nitro groups, amine groups, silyl groups, oxy groups, sulfenyl groups, sulfinyl groups, sulfonyl groups, carbonyl groups, boron groups, phosphine oxide groups, phosphine sulfide groups, alkyl groups, alkenyl groups, alkynyl groups, hydrocarbon ring groups, aryl groups, heterocyclic groups and combinations thereof. Each of the substituents listed above can be substituted or unsubstituted per se. For example, biphenyl groups can be interpreted as aryl groups, or they can be interpreted as phenyl groups substituted by phenyl groups.

[0042] In the specification, the term "combines with an adjacent group to form a ring" can be interpreted as a group that combines (or bonds) with an adjacent group to form a substituted or unsubstituted hydrocarbon ring or a substituted or unsubstituted heterocyclic ring. The hydrocarbon ring can be an aliphatic hydrocarbon ring or an aromatic hydrocarbon ring. The heterocyclic ring can be an aliphatic heterocyclic ring or an aromatic heterocyclic ring. The hydrocarbon ring and the heterocyclic ring can each independently be a monocyclic ring or a polycyclic ring. The ring formed by the adjacent groups combining with each other can itself be connected to another ring to form a spiro structure.

[0043] In the specification, the term "adjacent group" may be interpreted as a substituent substituted on an atom directly connected to an atom substituted by a substituent, another substituent substituted on an atom substituted by a substituent, or a substituent closest to another substituent in terms of stereostructure. For example, two methyl groups in 1,2-dimethylbenzene may be interpreted as "adjacent groups" to each other, and two ethyl groups in 1,1-diethylcyclopentane may be interpreted as "adjacent groups" to each other. For example, two methyl groups in 4,5-dimethylphenanthrene may be interpreted as "adjacent groups" to each other.

[0044] In the specification, examples of the halogen atom may include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.

[0045] In the specification, the alkyl group may be linear or branched. The number of carbon atoms in the alkyl group may be 1 to 50, 1 to 30, 1 to 20, 1 to 10, or 1 to 6. Examples of the alkyl group may include methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, isobutyl, 2-ethylbutyl, 3,3-dimethylbutyl, n-pentyl, isopentyl, neopentyl, tert-pentyl, 1-methylpentyl, 3-methylpentyl, 2-ethylpentyl, 4-methyl-2-pentyl, n-hexyl, 1-methylhexyl, 2-ethylhexyl, 2-butylhexyl, n-heptyl, 1-methylheptyl, 2,2-dimethylheptyl, 2-ethylheptyl, 2-butylheptyl, 3-methylheptyl, n-octyl, tert-octyl, 2-ethyloctyl, 2-butyloctyl, 2-hexyloctyl, 3,7-dimethyloctyl, n-nonyl, n-decyl, adamantyl, 2-ethyldecyl, 2-butyldecyl, 2-hexyldecyl, 2-octyldecyl, Undecyl, dodecyl, 2-ethyldodecyl, 2-butyldodecyl, 2-hexyldodecyl, 2-octyldodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, 2-ethylhexadecyl, 2-butylhexadecyl, 2-hexylhexadecyl, 2-octylhexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, 2-ethyleicosyl, 2-butyleicosyl, 2-hexyleicosyl, 2-octyleicosyl, heneicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, triacontyl, etc., but the embodiment is not limited thereto.

[0046] In the specification, the cycloalkyl group may be a cyclic alkyl group. The number of carbon atoms in the cycloalkyl group may be 3 to 50, 3 to 30, 3 to 20, or 3 to 10. Examples of the cycloalkyl group may include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4-tert-butylcyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, norbornyl, 1-adamantyl, 2-adamantyl, isobornyl, bicycloheptyl, etc., but the embodiment is not limited thereto.

[0047] In the specification, the alkenyl group may be a hydrocarbon group including at least one carbon-carbon double bond in the middle or at the end of an alkyl group having two or more carbon atoms. The alkenyl group may be linear or branched. The number of carbon atoms in the alkenyl group is not particularly limited, and may be 2 to 30, 2 to 20, or 2 to 10. Examples of alkenyl groups may include vinyl, 1-butenyl, 1-pentenyl, 1,3-butadienyl, styryl, styrylvinyl, etc., but embodiments are not limited thereto.

[0048] In the specification, the alkynyl group may be a hydrocarbon group including at least one carbon-carbon triple bond in the middle or at the end of an alkyl group having two or more carbon atoms. The alkynyl group may be linear or branched. The number of carbon atoms in the alkynyl group is not particularly limited, and may be 2 to 30, 2 to 20, or 2 to 10. Examples of the alkynyl group may include ethynyl, propynyl, etc., but embodiments are not limited thereto.

[0049] In the specification, the hydrocarbon ring group may be any functional group or substituent derived from an aliphatic hydrocarbon ring. For example, the hydrocarbon ring group may be a saturated hydrocarbon ring group having 5 to 20 ring-forming carbon atoms.

[0050] In the specification, the aryl group may be any functional group or substituent derived from an aromatic hydrocarbon ring. The aryl group may be a monocyclic aryl group or a polycyclic aryl group. The number of ring-forming carbon atoms in the aryl group may be 6 to 30, 6 to 20, or 6 to 15. Examples of aryl groups may include phenyl, naphthyl, fluorenyl, anthracenyl, phenanthrenyl, biphenyl, terphenyl, quaterphenyl, pentaphenyl, hexaphenyl, triphenylene, pyrenyl, benzofluoranthenyl, 1,2-triphenylenyl, etc., but embodiments are not limited thereto.

[0051] In the specification, the fluorenyl group may be substituted, or two substituents thereof may be combined with each other to form a spiro structure. Examples of the substituted fluorenyl group may include the groups shown below, but the embodiment is not limited thereto.

[0052]

[0053] In the specification, the heterocyclic group may be any functional group or substituent derived from a cyclic group including at least one of B, O, N, P, Si and S as a heteroatom. The heterocyclic group may be an aliphatic heterocyclic group or an aromatic heterocyclic group. The aromatic heterocyclic group may be a heteroaryl group. The aliphatic heterocyclic ring and the aromatic heterocyclic ring may each independently be a monocyclic ring or a polycyclic ring.

[0054] In the specification, when the heterocyclic group includes two or more heteroatoms, the two or more heteroatoms may be the same or different from each other. The heterocyclic group may be a monocyclic heterocyclic group or a polycyclic heterocyclic group, and includes a heteroaryl group. The number of ring-forming carbon atoms in the heterocyclic group may be 2 to 30, 2 to 20, or 2 to 10.

[0055] In the specification, the number of ring-forming carbon atoms of the aliphatic heterocyclic group may be 2 to 30, 2 to 20, or 2 to 10. Examples of the aliphatic heterocyclic group may include an oxirane group, an oxirane group, a pyrrolidinyl group, a piperidinyl group, a tetrahydrofuranyl group, a tetrahydrothiophenyl group, a thianyl group, a tetrahydropyranyl group, a 1,4-dioxanyl group, and the like, but the embodiment is not limited thereto.

[0056] In the specification, if the heteroaryl group contains two or more heteroatoms, the two or more heteroatoms may be the same or different from each other. The heteroaryl group may be a monocyclic heterocyclic group or a polycyclic heterocyclic group. The number of ring carbon atoms in the heteroaryl group may be 2 to 30, 2 to 20, or 2 to 10. Examples of heteroaryl groups may include thienyl, furanyl, pyrrolyl, imidazolyl, pyridyl, bipyridyl, pyrimidyl, triazine, triazolyl, acridinyl, pyridazinyl, pyrazinyl, quinolyl, quinazolinyl, quinoxalinyl, phenoxazinyl, phthalazinyl, pyridopyrimidinyl, pyridopyrazinyl, pyrazinopyrazinyl, isoquinolyl, indolyl, carbazolyl, N-arylcarbazolyl, N-heteroarylcarbazolyl, N-alkylcarbazolyl, benzoxazolyl, benzimidazolyl, benzothiazolyl, benzocarbazolyl, benzothienyl, dibenzothienyl, thienothiphenyl, benzofuranyl, phenanthrolinyl, thiazolyl, isoxazolyl, oxazolyl, oxadiazolyl, thiadiazolyl, phenothiazinyl, dibenzothirolyl, dibenzofuranyl, and the like, but embodiments are not limited thereto.

[0057] The heteroaryl group including sulfur (S) atom as a heteroatom may be a benzothienyl group, but the embodiment is not limited thereto. The heteroaryl group including sulfur (S) atom as a heteroatom may also be a thienopyridyl group, a thienopyrimidyl group, a thienopyridazinyl group, a thienopyrazinyl group, a thienotriazinyl group, a thienotetrazinyl group, a thiazolopyridyl group, a thiazolopyridinyl group, a thiazolopyridazinyl group, a thiazolopyrazinyl group, a thiazotriazinyl group, a thiazotetrazinyl group, a benzothiadiazolyl group, a thiadiazopyridyl group, a thiadiazopyrimidyl group, a thiadiazopyridazinyl group, a thiadiazopyrazinyl group, a thiadiazotriazinyl group, a thiadiazotetrazinyl group, etc., but the embodiment is not limited thereto.

[0058] In the specification, the above description of the aryl group may be applied to the arylene group, except that the arylene group is a divalent group. In the specification, the above description of the heteroaryl group may be applied to the heteroarylene group, except that the heteroarylene group is a divalent group.

[0059] In the specification, the silyl group may be an alkylsilyl group or an arylsilyl group. The alkyl group in the alkylsilyl group may be linear, branched or cyclic. The number of carbon atoms in the alkylsilyl group is not specifically limited, but may be, for example, 1 to 20 or 1 to 10. The number of carbon atoms in the arylsilyl group is not specifically limited, but may be, for example, 6 to 30, 6 to 20 or 6 to 15. Examples of silyl groups may include trimethylsilyl, triethylsilyl, tert-butyldimethylsilyl, vinyldimethylsilyl, propyldimethylsilyl, triphenylsilyl, diphenylsilyl, phenylsilyl, etc., but embodiments are not limited thereto.

[0060] In the specification, the number of carbon atoms in the carbonyl group is not particularly limited, and may be 1 to 40, 1 to 30, or 1 to 20. For example, the carbonyl group may have one of the following structures, but the embodiment is not limited thereto.

[0061]

[0062] In the specification, the number of carbon atoms in the sulfinyl group or the sulfonyl group is not particularly limited, and may be 1 to 30. The sulfinyl group may be an alkylsulfinyl group or an arylsulfinyl group. The sulfonyl group may be an alkylsulfonyl group or an arylsulfonyl group.

[0063] In the specification, the thio group may be an alkylthio group or an arylthio group. The thio group may be a sulfur atom combined with an alkyl group or an aryl group as defined above. The alkyl group in the alkylthio group may be linear, branched or cyclic. The number of carbon atoms of the alkylthio group is not specifically limited, but may be, for example, 1 to 20 or 1 to 10. The number of carbon atoms of the arylthio group is not specifically limited, but may be, for example, 6 to 30, 6 to 20 or 6 to 15. Examples of thio groups may include methylthio, ethylthio, propylthio, pentylthio, hexylthio, octylthio, dodecylthio, cyclopentylthio, cyclohexylthio, phenylthio, naphthylthio, etc., but embodiments are not limited thereto.

[0064] In the specification, the oxy group may be an oxygen atom combined with an alkyl group or an aryl group as defined above. The oxy group may be an alkoxy group or an aryloxy group. The alkoxy group may be linear, branched or cyclic. The number of carbon atoms in the alkoxy group is not particularly limited, and may be, for example, 1 to 20 or 1 to 10. The number of carbon atoms in the aryloxy group is not specifically limited, but may be, for example, 6 to 30, 6 to 20 or 6 to 15. Examples of oxy groups may include methoxy, ethoxy, n-propoxy, isopropoxy, butoxy, pentyloxy, hexyloxy, octyloxy, nonyloxy, decyloxy, benzyloxy, etc., but embodiments are not limited thereto.

[0065] In the specification, the boryl group may be a boron atom combined with an alkyl group or an aryl group as defined above. The boryl group may be an alkyl boryl group or an aryl boryl group. The alkyl group in the alkyl boryl group may be linear, branched or cyclic. The number of carbon atoms of the alkyl boryl group is not specifically limited, but may be, for example, 1 to 20 or 1 to 10. The number of carbon atoms of the aryl boryl group is not specifically limited, but may be, for example, 6 to 30, 6 to 20 or 6 to 15. Examples of boryl groups may include dimethyl boryl, diethyl boryl, tert-butyl methyl boryl, diphenyl boryl, phenyl boryl, etc., but embodiments are not limited thereto.

[0066] In the specification, the amine group may be an alkylamine group or an arylamine group. The alkyl group in the alkylamine group may be linear, branched or cyclic. The number of carbon atoms of the alkylamine group is not specifically limited, but may be, for example, 1 to 20 or 1 to 10. The number of carbon atoms of the arylamine group is not specifically limited, but may be, for example, 6 to 30, 6 to 20 or 6 to 15. Examples of the amine group may include methylamine, dimethylamine, phenylamine, diphenylamine, naphthylamine, 9-methyl-anthrylamine, etc., but the embodiment is not limited thereto.

[0067] In the specification, the sulfinyl group may mean an alkyl group or an aryl group defined above combined with -S(=O)-. The number of carbon atoms of the sulfinyl group is not particularly limited, but may be 1 to 30, 1 to 20, or 1 to 10. The sulfinyl group may include an alkylsulfinyl group and an arylsulfinyl group. For example, the sulfinyl group may have the following structure, but is not limited thereto.

[0068]

[0069] In the specification, sulfonyl may refer to -S(=O) 2 - combined with the above-defined alkyl or aryl groups. The number of carbon atoms of the sulfonyl group is not particularly limited, but may be 1 to 30, 1 to 20, or 1 to 10. The sulfonyl group may include an alkylsulfonyl group and an arylsulfonyl group. For example, the sulfonyl group may have the following structure, but is not limited thereto.

[0070]

[0071] In the specification, the phosphine oxide group may mean an alkyl group or an aryl group defined above combined with -P(=O)-. The number of carbon atoms of the phosphine oxide group is not particularly limited, but may be 1 to 30, 1 to 20, or 1 to 10. The phosphine oxide group may include an alkyl phosphine oxide group and an aryl phosphine oxide group. For example, the phosphine oxide group may have the following structure, but is not limited thereto.

[0072]

[0073] In the specification, the phosphinosulfide group may mean an alkyl or aryl group defined above in combination with -P(=S)-. The number of carbon atoms of the phosphinosulfide group is not particularly limited, but may be 1 to 30, 1 to 20, or 1 to 10. The phosphinosulfide group may include an alkylphosphinosulfide group and an arylphosphinosulfide group. For example, the phosphinosulfide group may have the following structure, but is not limited thereto.

[0074]

[0075] In the specification, the alkyl group in the alkoxy group, alkylthio group, alkylsulfonyl group, alkylsulfinyl group, alkylaryl group, alkylboryl group, alkylsilyl group, alkylphosphine oxide group, alkylphosphine sulfide group or alkylamine group may be the same as exemplified above for the alkyl group.

[0076] In the specification, the aryl group in the aryloxy group, arylthio group, arylsulfonyl group, arylsulfinyl group, arylboryl group, arylsilyl group, arylphosphine oxide group, arylphosphine sulfide group or arylamine group may be the same as exemplified above.

[0077] In the specification, a direct bond may be a single bond.

[0078] In this manual, the symbol Each represents a bond to adjacent atoms in the corresponding formula or moiety.

[0079] Hereinafter, a display device according to an embodiment will be described with reference to the accompanying drawings.

[0080] Figure 1 2 is a perspective view for explaining a display device DD according to an embodiment. Figure 1 1 and 2 illustrate a display device DD provided with a flat display surface DD-IS, but the embodiment is not limited thereto. The display device DD may include a curved display surface or a cubic display surface. The cubic display surface may include a plurality of display areas indicating directions different from each other.

[0081] The display surface DD-IS may include a display area DA and a non-display area NDA. The pixel PX is disposed in the display area DA, but not in the non-display area NDA. The non-display area NDA is defined along a boundary of the display surface DD-IS. The non-display area NDA may surround the display area DA, but the embodiment is not limited thereto. In an embodiment, the non-display area NDA may be omitted, or may be disposed only on one side of the display area DA.

[0082] The thickness direction of the display device DD may be parallel to a third direction DR3 which is a normal direction of a plane defined by the first direction DR1 and the second direction DR2. The directions indicated by the first to third directions DR1, DR2, and DR3 described in this specification are relative concepts and may be changed to other directions.

[0083] In the present specification, the upper surface (or front surface) and the lower surface (rear surface) of the components constituting the display device DD may be defined relative to the third direction DR3. More specifically, of the two surfaces facing each other relative to the third direction DR3 in one component, the surface relatively adjacent to the display surface DD-IS may be defined as the front surface (or upper surface), and the other surface relatively spaced apart from the display surface DD-IS may be defined as the rear surface (or lower surface). In addition, in the present specification, the upper portion and the lower portion may be defined relative to the third direction DR3. The upper portion may be defined as a portion close to the display surface DD-IS, and the lower portion may be defined as a portion away from the display surface DD-IS.

[0084] Figure 2 According to the implementation method Figure 1 1 is a cross-sectional view of the display device DD taken along line II'.

[0085] refer to Figure 2 , the display device DD may include a display panel DP and an optical layer PP disposed on the display panel DP.

[0086] In the display device DD according to the embodiment, the display panel DP may be a light-emitting display panel. For example, the display panel DP may be a quantum dot light-emitting display panel including quantum dot light-emitting elements, but the embodiment is not limited thereto.

[0087] The display panel DP may include a display element layer DP-EL. The display element layer DP-EL includes a light emitting element. The display panel DP may include a base substrate BS, a circuit layer DP-CL disposed on the base substrate BS, and a display element layer DP-EL disposed on the circuit layer DP-CL.

[0088] The base substrate BS may be a member for supplying a base plane on which the display element layer DP-EL is disposed. The base substrate BS may be a glass substrate, a metal substrate, a plastic substrate, etc. However, the embodiment is not limited thereto, and the base substrate BS may be an inorganic layer, an organic layer, or a composite material layer. The base substrate BS may be a flexible substrate that is easily bent or folded.

[0089] In an embodiment, the circuit layer DP-CL may be disposed on the base substrate BS and may include a plurality of transistors. The plurality of transistors may include a control electrode, an input electrode, and an output electrode, respectively. For example, the circuit layer DP-CL may include a switching transistor and a driving transistor for driving the light emitting element of the display element layer DP-EL.

[0090] Figure 3 is an enlarged plan view partially illustrating a display device DD according to an embodiment. Figure 4 is a cross-sectional view of a display device DD according to an embodiment. Figure 4 Explains along the Figure 3 The part intercepted by line II-II' in.

[0091] refer to Figure 3 , the display device DD according to the embodiment may include a plane including three light emitting areas PXA-R, PXA-G and PXA-B and non-light emitting areas NPXA adjacent thereto. In the embodiment, Figure 3 The three light emitting areas PXA-R, PXA-G and PXA-B explained in the above description may be repeatedly arranged in the entire display area DA (see Figure 1 )middle.

[0092] The non-luminescent region NPXA is disposed around the first to third luminescent regions PXA-R, PXA-G, and PXA-B. The non-luminescent region NPXA sets the boundaries of the first to third luminescent regions PXA-R, PXA-G, and PXA-B. The non-luminescent region NPXA may surround the first to third luminescent regions PXA-R, PXA-G, and PXA-B. A structure that prevents color mixing between the first to third luminescent regions PXA-R, PXA-G, and PXA-B, for example, a pixel defining film PDL (see Figure 4 )wait.

[0093] Figure 3 The first to third light-emitting regions PXA-R, PXA-G, and PXA-B having the same planar shape and different planar areas (hereinafter referred to as areas) are exemplarily explained, but the embodiment is not limited thereto. At least two of the first to third light-emitting regions PXA-R, PXA-G, and PXA-B may have the same area. Depending on the color of light emitted by the first to third light-emitting regions PXA-R, PXA-G, and PXA-B, the areas of the first to third light-emitting regions PXA-R, PXA-G, and PXA-B may be set.

[0094] Figure 3 The first to third light-emitting regions PXA-R, PXA-G, and PXA-B having a rectangular shape are explained, but the embodiment is not limited thereto. On a plane, the first to third light-emitting regions PXA-R, PXA-G, and PXA-B may have a polygonal shape (including a substantially polygonal shape) different from a rectangular shape, such as a rhombus or a pentagon. In an embodiment, the first to third light-emitting regions PXA-R, PXA-G, and PXA-B may have a rectangular shape (substantially a rectangular shape) having a rounded corner region on a plane.

[0095] Figure 3 It is exemplarily explained that the second light-emitting area PXA-G is disposed on the first row, and the third light-emitting area PXA-B and the first light-emitting area PXA-R are disposed on the second row, but the embodiment is not limited thereto, and the arrangement of the first to third light-emitting areas PXA-R, PXA-G, and PXA-B may be changed differently. For example, the first to third light-emitting areas PXA-R, PXA-G, and PXA-B may be disposed on the same row.

[0096] exist Figure 3In the display device DD according to the embodiment explained in the embodiment, three light-emitting areas PXA-R, PXA-G and PXA-B that emit blue light, green light and red light, respectively, are exemplarily explained. For example, the display device DD according to the embodiment may include a red light-emitting area PXA-R, a green light-emitting area PXA-G and a blue light-emitting area PXA-B that are different from each other. In this specification, the red light-emitting area PXA-R, the green light-emitting area PXA-G and the blue light-emitting area PXA-B may be referred to as a first light-emitting area PXA-R, a second light-emitting area PXA-G and a third light-emitting area PXA-B, respectively.

[0097] refer to Figure 3 and Figure 4 , the first light-emitting area PXA-R, the second light-emitting area PXA-G, and the third light-emitting area PXA-B of the display device DD may correspond to the first light-emitting element ED-1, the second light-emitting element ED-2, and the third light-emitting element ED-3, respectively. The plurality of light-emitting elements ED-1, ED-2, and ED-3 may emit light having wavelength regions different from each other. In an embodiment, the display device DD may include a first light-emitting element ED-1 that generates a first light, a second light-emitting element ED-2 that generates a second light, and a third light-emitting element ED-3 that generates a third light. For example, the display device DD may include a first light-emitting element ED-1 that generates red light, a second light-emitting element ED-2 that generates green light, and a third light-emitting element ED-3 that generates blue light. However, the embodiment is not limited thereto, and the first to third light-emitting elements ED-1, ED-2, and ED-3 may emit light having the same wavelength region, or at least one of them may emit light having a different wavelength region.

[0098] In the display device DD according to the embodiment, the first to third light-emitting regions PXA-R, PXA-G, and PXA-B may have different areas from each other. That is, depending on the color of the light emitted by the first to third light-emitting layers EML-R, EML-G, and EML-B of the first to third light-emitting elements ED-1, ED-2, and ED-3, the first to third light-emitting regions PXA-R, PXA-G, and PXA-B may have different areas from each other. In this case, the area may mean an area on a plane defined by the first direction DR1 and the second direction DR2. For example, in the display device DD according to the embodiment, the second light-emitting region PXA-G corresponding to the second light-emitting element ED-2 generating green light may have the largest area, and the third light-emitting region PXA-B corresponding to the third light-emitting element ED-3 generating blue light may have the smallest area, but the embodiment is not limited thereto. The first to third light emitting regions PXA-R, PXA-G, and PXA-B may emit light of other colors in addition to red light, green light, and blue light, and the first to third light emitting regions PXA-R, PXA-G, and PXA-B may have the same area, or may provide Figure 3Different area ratios explained in the figure.

[0099] refer to Figure 4 , the display device DD according to the embodiment may include a display panel DP and an optical layer PP disposed on the display panel DP, the display panel DP including a plurality of light emitting elements ED- 1 , ED- 2 , and ED- 3 .

[0100] The display panel DP may include a base substrate BS, a circuit layer DP-CL provided on the base substrate BS, and a display element layer DP-EL. The display element layer DP-EL may include a pixel defining film PDL, first to third light emitting elements ED-1, ED-2, and ED-3 disposed between or on the pixel defining films PDL, and an encapsulation layer TFE disposed on the first to third light emitting elements ED-1, ED-2, and ED-3.

[0101] The display element layer DP-EL may include a pixel defining film PDL. Each of the first to third light-emitting regions PXA-R, PXA-G, and PXA-B may be a region divided by the pixel defining film PDL. The non-light-emitting region NPXA may be a region between the adjacent first to third light-emitting regions PXA-R, PXA-G, and PXA-B, and may be a region corresponding to the pixel defining film PDL. In the present specification, each of the first to third light-emitting regions PXA-R, PXA-G, and PXA-B may correspond to a pixel. Reference Figure 4 , the pixel defining film PDL may separate the first to third light emitting elements ED-1, ED-2, and ED-3. In addition, the first to third light emitting layers EML-R, EML-G, and EML-B of the first to third light emitting elements ED-1, ED-2, and ED-3 may be disposed in the opening OH defined by the pixel defining film PDL to separate the first to third light emitting elements ED-1, ED-2, and ED-3.

[0102] The pixel defining film PDL may be formed of a polymer resin. For example, the pixel defining film PDL may be formed by including a polyacrylate resin or a polyimide resin. In addition, in addition to the polymer resin, the pixel defining film PDL may be formed by further including an inorganic material. The pixel defining film PDL may be formed by including a light absorbing material or a black pigment or dye. A black pixel defining film may be realized by forming a pixel defining film PDL including a black pigment or dye. In the case of forming the pixel defining film PDL, carbon black or the like may be used as a black pigment or dye, but the embodiment is not limited thereto.

[0103] The pixel definition layer PDL may be formed of an inorganic material. For example, the pixel definition layer PDL may be formed of a silicon nitride (SiN x ), silicon oxide (SiO x ) and / or silicon oxynitride (SiOx N y ). The pixel definition film PDL may define the first to third light emitting regions PXA-R, PXA-G, and PXA-B. The first to third light emitting regions PXA-R, PXA-G, and PXA-B and the non-light emitting region NPXA may be divided by the pixel definition film PDL.

[0104] refer to Figure 4 , the display element layer DP-EL may include first to third light emitting elements ED-1, ED-2, and ED-3 disposed between the pixel defining films PDL. The display device DD according to the embodiment may include first to third light emitting elements ED-1, ED-2, and ED-3, and the first to third light emitting elements ED-1, ED-2, and ED-3 may include first to third light emitting layers EML-R, EML-G, and EML-B, respectively. The first to third light emitting elements ED-1, ED-2, and ED-3 according to the embodiment may include a first electrode EL1, a second electrode EL2 facing the first electrode EL1, and a plurality of functional layers disposed between the first electrode EL1 and the second electrode EL2 and including first to third light emitting layers EML-R, EML-G, and EML-B, respectively.

[0105] The plurality of functional layers may include a hole transport region HTR disposed between the first electrode EL1 and the first to third light emitting layers EML-R, EML-G, and EML-B, and an electron transport region ETR disposed between the first to third light emitting layers EML-R, EML-G, and EML-B and the second electrode EL2.

[0106] The hole transport region HTR and the electron transport region ETR may each include a plurality of sub-functional layers. For example, the hole transport region HTR may include a hole injection layer and a hole transport layer as sub-functional layers, and the electron transport region ETR may include an electron injection layer and an electron transport layer as sub-functional layers. The embodiment is not limited thereto, and the hole transport region HTR may further include an electron blocking layer, etc., as a sub-functional layer, and the electron transport region ETR may further include a hole blocking layer, etc., as a sub-functional layer.

[0107] The first electrode EL1 has conductivity. The first electrode EL1 may be formed of a metal material, a metal alloy, or a conductive compound. The first electrode EL1 may be an anode or a cathode, but the embodiment is not limited thereto. In addition, the first electrode EL1 may be a pixel electrode. The first electrode EL1 may be a transmissive electrode, a semi-transmissive electrode, or a reflective electrode. The first electrode EL1 may include at least one of Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF, Mo, Ti, W, In, Sn, and Zn, oxides thereof, compounds thereof, and mixtures thereof.

[0108] In the case where the first electrode EL1 is a transmissive electrode, the first electrode EL1 may include a transparent conductive oxide, for example, indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium tin zinc oxide (ITZO), etc. In the case where the first electrode EL1 is a semi-transmissive electrode or a reflective electrode, the first electrode EL1 may include at least one of Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF, Mo, Ti, Yb, and W, a compound thereof, or a mixture thereof (for example, a mixture of Ag and Mg), or a material having a multilayer structure such as LiF / Ca (a stacked structure of LiF and Ca) or LiF / Al (a stacked structure of LiF and Al). In another embodiment, the first electrode EL1 may have a structure consisting of a plurality of layers including a reflective film or a semi-transmissive film formed of the above materials, and a transparent conductive film formed of indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium tin zinc oxide (ITZO), etc. For example, the first electrode EL1 may have a triple-layered structure of ITO / Ag / ITO, but the embodiment is not limited thereto.

[0109] The hole transport region HTR is provided on the first electrode EL1. The hole transport region HTR may include a hole injection layer, a hole transport layer, etc. The hole transport region HTR may have a structure having a single layer composed of a single material, a single layer composed of a plurality of different materials, or a plurality of layers composed of a plurality of different materials.

[0110] The hole transport region HTR may be formed using various methods such as vacuum deposition, spin coating, casting, LB (Langmuir-Blodgett) method, inkjet printing, laser printing, or laser induced thermal imaging (LITI) method.

[0111] For example, the hole transport region HTR may include carbazole derivatives (such as N-phenylcarbazole or polyvinylcarbazole), fluorene derivatives, triphenylamine derivatives (such as TPD (N,N'-bis(3-methylphenyl)-N,N'-diphenyl-[1,1'-biphenyl]-4,4'-diamine), TCTA (4,4',4"-tri(N-carbazolyl)triphenylamine), NPD (N,N'-di(naphthalene-1-yl)-N,N'-diphenyl-benzidine), TAPC (4,4'-cyclohexylenebis[N,N-bis(4-methylphenyl)aniline]), HMTPD (4,4'-bis[N,N'-(3-methylphenyl)amino]-3,3'-dimethylbiphenyl) or mCP (1,3-bis(N-carbazolyl)benzene), etc.).

[0112] The hole transport region HTR may have a thickness of about 5 nm to about 1500 nm, for example, about 10 nm to about 500 nm. When the thickness of the hole transport region HTR satisfies the above range, satisfactory hole transport characteristics may be obtained without significantly increasing the driving voltage.

[0113] The first to third light-emitting layers EML-R, EML-G and EML-B are provided on the hole transport region HTR. The light-emitting elements ED-1, ED-2 and ED-3 may include the first to third light-emitting layers EML-R, EML-G and EML-B, respectively. The first light-emitting element ED-1 may include a first light-emitting layer EML-R, the second light-emitting element ED-2 may include a second light-emitting layer EML-G, and the third light-emitting element ED-3 may include a third light-emitting layer EML-B.

[0114] The first to third light-emitting layers EML-R, EML-G, and EML-B may include a host and a dopant. In an embodiment, the first light-emitting layer EML-R may include a first host and a first dopant, the second light-emitting layer EML-G may include a second host and a second dopant, and the third light-emitting layer EML-B may include a third host and a third dopant.

[0115] In an embodiment, the first light-emitting layer EML-R and the second light-emitting layer EML-G may include a first quantum dot QD1 as a first dopant and a second quantum dot QD2 as a second dopant, respectively. In an embodiment, the first light-emitting layer EML-R and the second light-emitting layer EML-G may include a first quantum dot QD1 as a first dopant and a second quantum dot QD2 as a second dopant, respectively, and may further include a first host and a second host, respectively. In an embodiment, the third light-emitting layer EML-B may include an organic light-emitting material as a third dopant. In an embodiment, the third light-emitting layer EML-B may include an organic light-emitting material as a third dopant, and may further include an organic light-emitting material as a third host. For example, the third dopant may be a thermally activated delayed fluorescence (TADF) dopant.

[0116] The first light emitting layer EML-R may include a first quantum dot QD1, and the second light emitting layer EML-G may include a second quantum dot QD2. The first light emitting layer EML-R may include a plurality of first quantum dots QD1, and the second light emitting layer EML-G may include a plurality of second quantum dots QD2. The first quantum dots QD1 and the second quantum dots QD2 respectively included in the first light emitting layer EML-R and the second light emitting layer EML-G may be stacked to constitute a layer. Figure 4It is explained that the first quantum dot QD1 and the second quantum dot QD2 having a circular cross-sectional shape are arranged to constitute approximately two layers as an example, but the embodiment is not limited thereto. For example, depending on the thickness of the first light-emitting layer EML-R and the second light-emitting layer EML-G, the shape of the first quantum dot QD1 included in the first light-emitting layer EML-R and the second quantum dot QD2 included in the second light-emitting layer EML-G, the average diameter of the first quantum dot QD1 and the second quantum dot QD2, etc., the arrangement of the first quantum dot QD1 and the second quantum dot QD2 may be different. For example, in the first light-emitting layer EML-R and the second light-emitting layer EML-G, the first quantum dot QD1 and the second quantum dot QD2 may be arranged adjacent to each other to constitute a single layer, or may be arranged to constitute multiple layers (such as two or three layers).

[0117] The first quantum dot QD1 and the second quantum dot QD2 may each include a core and a shell surrounding the core. Accordingly, the first quantum dot QD1 and the second quantum dot QD2 may each have a core-shell structure. In an embodiment, the first quantum dot QD1 and the second quantum dot QD2 respectively included in the first light-emitting element ED-1 and the second light-emitting element ED-2 may be formed of different core materials. In another embodiment, the first quantum dot QD1 and the second quantum dot QD2 may each be formed of the same core material, or a portion of the quantum dots selected from the first quantum dot QD1 and the second quantum dot QD2 may each be formed of the same core material, and the quantum dots selected from the remainder of the first quantum dot QD1 and the second quantum dot QD2 may be formed of a core material different from the core material.

[0118] In an embodiment, the first quantum dot QD1 and the second quantum dot QD2 may have different diameters. For example, compared to the first quantum dot QD1 used in the first light-emitting element ED-1 that emits light in a relatively long wavelength region, the second quantum dot QD2 used in the second light-emitting element ED-2 that emits light in a relatively short wavelength region may have a relatively small average diameter. In the present specification, the average diameter may be the arithmetic mean of the diameters of the quantum dot particles. The diameter of the quantum dot particles may be the average value of the width of the quantum dot particles measured on the cross section of the quantum dot particles. However, the relationship between the average diameter of the first quantum dot QD1 and the average diameter of the second quantum dot QD2 is not limited to the above relationship. Figure 4 It is explained that the size of each of the plurality of first quantum dots QD1 and the size of each of the plurality of second quantum dots QD2 are similar to each other. However, in another embodiment, the sizes of the first quantum dots QD1 and the second quantum dots QD2 respectively included in the first light-emitting element ED-1 and the second light-emitting element ED-2 may be different from each other.

[0119] The first quantum dot QD1 and the second quantum dot QD2 may be crystals of semiconductor compounds. Depending on the size of the first quantum dot QD1 and the second quantum dot QD2, the first quantum dot QD1 and the second quantum dot QD2 may emit light having various luminescent wavelength regions. The first quantum dot QD1 and the second quantum dot QD2 may emit light having various luminescent wavelength regions by controlling the ratio of elements in the quantum compounds constituting the first quantum dot QD1 and the second quantum dot QD2.

[0120] For example, the first quantum dot QD1 and the second quantum dot QD2 may each independently have a diameter in the range of about 1 nm to about 10 nm. The first quantum dot QD1 and the second quantum dot QD2 may be synthesized in a wet chemical process, an organic metal chemical deposition (MOCVD) process, a molecular beam epitaxy (MBE) process, or a process similar thereto.

[0121] The wet chemical process for manufacturing the first quantum dot QD1 and the second quantum dot QD2 is a method for growing quantum dot particle crystals after mixing an organic solvent and a precursor material. In the case of quantum dot particle crystal growth, the organic solvent can naturally act as a dispersant that coordinates with the surface of the quantum dot particle crystal, and can control the growth of the quantum dot particle crystal. Accordingly, the wet chemical process can be easier to perform than a vapor deposition process (such as a metal organic chemical vapor deposition process or a molecular beam epitaxy process), and the growth of quantum dot particle crystals can be controlled by a low-cost process.

[0122] The cores of the first quantum dot QD1 and the second quantum dot QD2 may each independently be a Group II-VI compound, a Group III-V compound, a Group III-VI compound, a Group I-III-VI compound, a Group IV-VI compound, a Group II-IV-V compound, a Group IV element, a Group IV compound, or a combination thereof.

[0123] Examples of Group II-VI compounds may include: binary compounds selected from the group consisting of CdSe, CdTe, CdS, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS, and mixtures thereof; ternary compounds selected from the group consisting of CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe , CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS and mixtures thereof; a quaternary compound selected from the group consisting of HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe and mixtures thereof; or a combination thereof. In an embodiment, the II-VI semiconductor compound may further include a Group I metal and / or a Group IV element. Examples of I-II-VI Group compounds may include CuZnS, and examples of II-IV-VI Group compounds may include ZnSnS, etc. Examples of I-II-IV-VI Group compounds may include quaternary compounds selected from the group consisting of: Cu 2 ZnSnS 2 , Cu 2 ZnSnS 4 , Cu 2 ZnSnSe 4 、Ag 2 ZnSnS 2 and mixtures thereof.

[0124] Examples of Group III-VI compounds may include: binary compounds such as In 2 S 3 or In 2 Se 3 ; Ternary compounds, such as InGaS 3 or InGaSe 3 ; or a combination thereof.

[0125] Examples of Group I-III-VI compounds may include: ternary compounds selected from AgInS, AgInS 2 、CuInS、CuInS 2 、AgGaS 2 、CuGaS 2 、CuGaO 2 、AgGaO 2 、AgAlO 2 and mixtures thereof; quaternary compounds, such as AgInGaS2 or CuInGaS 2 ; or a combination thereof.

[0126] Examples of Group III-V compounds may include: a binary compound selected from the group consisting of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, and mixtures thereof; a ternary compound selected from the group consisting of GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InGaP, InAlP, InNP, InNAs, InNSb, InPAs, InPSb, and mixtures thereof; a quaternary compound selected from the group consisting of GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, and mixtures thereof; or combinations thereof. In an embodiment, the Group III-V compound may further include a Group II metal. Examples of the Group III-II-V compound may include InZnP and the like.

[0127] Examples of Group IV-VI compounds may include: binary compounds selected from the group consisting of SnS, SnSe, SnTe, PbS, PbSe, PbTe and mixtures thereof; ternary compounds selected from the group consisting of SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe and mixtures thereof; quaternary compounds selected from the group consisting of SnPbSSe, SnPbSeTe, SnPbSTe and mixtures thereof; or combinations thereof.

[0128] Examples of Group II-IV-V compounds may include ternary compounds selected from the group consisting of: ZnSnP, ZnSnP 2 、ZnSnAs 2 、ZnGeP 2 、ZnGeAs 2 、CdSnP 2 、CdGeP 2 and mixtures thereof.

[0129] Examples of the Group IV element may include Si, Ge, and mixtures thereof. Examples of the Group IV compound may include a binary compound selected from the group consisting of SiC, SiGe, and mixtures thereof.

[0130] Each element included in a multi-component compound (such as a binary compound, ternary compound, or quaternary compound) can be present in the particles at a uniform concentration or a non-uniform concentration. For example, the formula representing a quantum dot can indicate the elements included in the quantum dot compound, but the elemental ratio in the compound can vary. For example, AgInGaS 2 can indicate AgIn x Ga 1-x S 2 (where x is a real number satisfying 0 < x < 1).

[0131] The binary compound, ternary compound, or quaternary compound can be present in the particles with a uniform concentration distribution or can be present in the particles with a partially different concentration distribution. In an embodiment, the first quantum dot QD1 and the second quantum dot QD2 can each have a core-shell structure in which the core is surrounded by a shell. The quantum dot having a core-shell structure can have a concentration gradient in which the concentration of the element present in the shell decreases toward the core.

[0132] In an embodiment, the first quantum dot QD1 and the second quantum dot QD2 can have a core-shell structure including a core and a shell surrounding the core as described above. The shells of the first quantum dot QD1 and the second quantum dot QD2 can each serve as a protective layer to prevent chemical modification of the core to maintain semiconductor characteristics and / or can serve as a charging layer to impart electrophoretic characteristics to the first quantum dot QD1 and the second quantum dot QD2. The shell can be a single layer or a multi-layer. Examples of the shells of the first quantum dot QD1 and the second quantum dot QD2 can include metal oxides, non-metal oxides, semiconductor compounds, or combinations thereof, etc.

[0133] Examples of the metal oxide or non-metal oxide can include: binary compounds such as SiO 2 、Al 2 O 3 、TiO 2 、ZnO、MnO、Mn 2 O 3 、Mn 3 O 4 、CuO、FeO、Fe 2 O 3 、Fe 3 O 4 、CoO、Co 3 O 4 or NiO; or ternary compounds such as MgAl 2 O 4 、CoFe 2 O 4 、NiFe 2 O 4 or CoMn 2 O 4 , but the embodiments are not limited thereto.

[0134] Examples of semiconductor compounds may include CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnSeS, ZnTeS, GaAs, GaP, GaSb, HgS, HgSe, HgTe, InAs, InP, InGaP, InSb, AlAs, AlP, or AlSb, etc., but embodiments are not limited thereto.

[0135] The first quantum dot QD1 and the second quantum dot QD2 may have a full width at half maximum (FWHM) of an emission spectrum equal to or less than about 45 nm. For example, the first quantum dot QD1 and the second quantum dot QD2 may have a FWHM of an emission spectrum equal to or less than about 40 nm. For example, the first quantum dot QD1 and the second quantum dot QD2 may have a FWHM of an emission spectrum equal to or less than about 30 nm. Color purity and / or color reproducibility may be improved within any of the above ranges. Light emitted from the first quantum dot QD1 and the second quantum dot QD2 may be emitted in all directions so that the optical viewing angle may be improved.

[0136] The shapes of the first quantum dot QD1 and the second quantum dot QD2 may be any shapes used in the relevant field. For example, the first quantum dot QD1 and the second quantum dot QD2 may each independently have a spherical shape, a pyramidal shape, a multi-arm shape or a cubic shape, a nanotube shape, a nanowire shape, a nanofiber shape or a nanoplate shape, etc.

[0137] Because the energy band gap of the first quantum dot QD1 and the second quantum dot QD2 can be controlled by controlling the size of the quantum dot or by adjusting the ratio of elements in the quantum dot compound, light of various wavelength regions can be obtained from the first light-emitting layer EML-R and the second light-emitting layer EML-G including the first quantum dot QD1 and the second quantum dot QD2, respectively. Accordingly, quantum dots as described above (having different sizes or having different ratios of elements in the quantum dot compound) can be implemented in a light-emitting element that emits light of various wavelength regions. For example, the size of the quantum dot or the ratio of elements in the quantum dot compound can be selectively controlled to emit red light or green light. For example, the size of the quantum dot or the ratio of elements in the quantum dot compound can be controlled so that the first quantum dot QD1 can emit red light, and the second quantum dot QD2 can emit green light.

[0138] The third light-emitting layer EML-B may include an organic light-emitting material as a light-emitting material. The third light-emitting layer EML-B may include a fluorescent or phosphorescent material. For example, the third light-emitting layer EML-B may include an anthracene derivative, a pyrene derivative, a fluoranthene derivative, a 1,2-benzophenanthrene derivative, a dihydrobenzanthracene derivative, or a triphenylene derivative. In an embodiment, the third light-emitting layer EML-B may include an organic metal complex as a light-emitting material. However, the materials included in the third light-emitting layer EML-B are not limited to the above materials, and may include other materials.

[0139] The third light emitting layer EML-B may generate blue light. The third light emitting layer EML-B may generate light having a wavelength in the range of about 420 nm to about 480 nm.

[0140] The third light emitting layer EML-B may include a compound represented by Chemical Formula E-1. The third host included in the third light emitting layer EML-B may include a compound represented by Chemical Formula E-1. The compound represented by Chemical Formula E-1 may be used as a fluorescent host material.

[0141] [Chemical formula E-1]

[0142]

[0143] In the chemical formula E-1, R 31 To R 40 Each of them may be independently a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted silyl group, a substituted or unsubstituted thiol group, a substituted or unsubstituted oxy group, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 10 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, or may be combined with an adjacent group to form a ring. For example, R 31 To R 40 It may combine with an adjacent group to form a saturated hydrocarbon ring, an unsaturated hydrocarbon ring, a saturated heterocyclic ring, or an unsaturated heterocyclic ring.

[0144] In Chemical Formula E-1, c and d may be an integer selected from 0 to 5, each independently.

[0145] In an embodiment, the compound represented by Chemical Formula E-1 may be any compound selected from Compound E1 to Compound E19.

[0146]

[0147]

[0148] In an embodiment, the third light emitting layer EML-B may include a compound represented by Chemical Formula E-2a or Chemical Formula E-2b. The third host included in the third light emitting layer EML-B may include a compound represented by Chemical Formula E-2a or Chemical Formula E-2b. The compound represented by Chemical Formula E-2a or Chemical Formula E-2b may be used as a phosphorescent host material.

[0149] [Chemical formula E-2a]

[0150]

[0151] In Formula E-2a, a may be an integer selected from 0 to 10; and L a It may be a direct bond, a substituted or unsubstituted arylene group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroarylene group having 2 to 30 ring carbon atoms. a The groups may each independently be a substituted or unsubstituted arylene group having 6 to 30 ring-forming carbon atoms or a substituted or unsubstituted heteroarylene group having 2 to 30 ring-forming carbon atoms.

[0152] In the chemical formula E-2a, A 1 To A 5 Can be N or CR independently i In the chemical formula E-2a, R a To R i Each of the R groups may independently be a hydrogen atom, a deuterium atom, a substituted or unsubstituted amine group, a substituted or unsubstituted thiol group, a substituted or unsubstituted oxy group, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, or may combine with an adjacent group to form a ring. For example, R a To R i It may combine with an adjacent group to form a hydrocarbon ring or a heterocyclic ring including N, O, S, etc. as a ring-constituting atom.

[0153] In the chemical formula E-2a, A 1 To A 5 Two or three of them can each be N, and the remaining A 1 To A 5 Can be independently CR i .

[0154] [Chemical formula E-2b]

[0155]

[0156] In the chemical formula E-2b, Cbz1 and Cbz2 may each independently be an unsubstituted carbazolyl group or a carbazolyl group substituted with an aryl group having 6 to 30 ring carbon atoms. b It may be a direct bond, a substituted or unsubstituted arylene group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroarylene group having 2 to 30 ring carbon atoms. In Formula E-2b, b may be an integer selected from 0 to 10. When b is equal to or greater than 2, multiple L b The groups may each independently be a substituted or unsubstituted arylene group having 6 to 30 ring-forming carbon atoms or a substituted or unsubstituted heteroarylene group having 2 to 30 ring-forming carbon atoms.

[0157] In an embodiment, the compound represented by Chemical Formula E-2a or Chemical Formula E-2b may be any compound selected from Compound Group E-2. However, the compounds listed in Compound Group E-2 are only examples, and the compounds represented by Chemical Formula E-2a or Chemical Formula E-2b are not limited to the compounds listed in Compound Group E-2.

[0158] [Compound Group E-2]

[0159]

[0160]

[0161] The third light-emitting layer EML-B may further include a material in the related art as a host material. For example, the third light-emitting layer EML-B may include at least one of BCPDS (bis(4-(9H-carbazol-9-yl)phenyl)diphenylsilane), POPCPA ((4-(1-(4-(diphenylamino)phenyl)cyclohexyl)phenyl)diphenyl-phosphine oxide), DPEPO (bis[2-(diphenylphosphino)phenyl]ether oxide), CBP (4,4'-bis(N-carbazolyl)-1,1'-biphenyl), mCP (1,3-bis(N-carbazolyl)benzene), PPF (2,8-bis(diphenylphosphino)dibenzo[b,d]furan), TCTA (4,4',4"-tri(N-carbazolyl)-triphenylamine) and TPBi (1,3,5-tri(1-phenyl-1H-benzo[d]imidazol-2-yl)benzene) as a host material. However, the embodiment is not limited thereto. For example, Alq 3(tris(8-hydroxyquinoline)aluminum), ADN(9,10-di(naphthalene-2-yl)anthracene), TBADN(2-tert-butyl-9,10-di(naphthalene-2-yl)anthracene), DSA(distyrylarene), CDBP(4,4'-bis(9-carbazolyl)-2,2'-dimethyl-biphenyl), MADN(2-methyl-9,10-bis(naphthalene-2-yl)anthracene), CP1(hexaphenylcyclotriphosphazene), UGH2(1,4-bis(triphenylsilyl)benzene), DPSiO 3 (hexaphenylcyclotrisiloxane) or DPSiO 4 (octaphenylcyclotetrasiloxane) or the like can be used as the host material.

[0162] In an embodiment, the third light emitting layer EML-B may include a compound represented by Chemical Formula Ma. The third dopant included in the third light emitting layer EML-B may include a compound represented by Chemical Formula Ma. The compound represented by Chemical Formula Ma may be used as a phosphorescent dopant material.

[0163] [Chemical formula Ma]

[0164]

[0165] In the chemical formula Ma, Y 1 To Y 4 and Z 1 To Z 4 Can be independently CR 1 or N; and R 1 To R 4 Each may be independently a hydrogen atom, a deuterium atom, a substituted or unsubstituted amine group, a substituted or unsubstituted thiol group, a substituted or unsubstituted oxy group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring-forming carbon atoms, or may be combined with an adjacent group to form a ring. In the chemical formula Ma, m may be 0 or 1, and n may be 2 or 3. In the chemical formula Ma, when m is 0, n may be 3, and when m is 1, n may be 2.

[0166] In an embodiment, the compound represented by the chemical formula Ma may be any compound selected from the group consisting of compounds M-a1 to M-a25. However, compounds M-a1 to M-a25 are merely examples, and the compound represented by the chemical formula Ma is not limited to compounds M-a1 to M-a25.

[0167]

[0168]

[0169]

[0170] In an embodiment, the third light emitting layer EML-B may include a compound represented by one of the chemical formulas Fa to Fc. The third dopant included in the third light emitting layer EML-B may include a compound represented by one of the chemical formulas Fa to Fc. The compounds represented by the chemical formulas Fa to Fc may each be used as a fluorescent dopant material.

[0171] [Chemical formula Fa]

[0172]

[0173] In the chemical formula Fa, R a To R i The two of them can be independently represented by *—NAr 1 Ar 2 The group represented by R is substituted. a To R i Not by *-NAr 1 Ar 2 The remainder of the group substitution represented may each independently be a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms.

[0174] In the chemical formula Fa, *-NAr 1 Ar 2 In the group represented by 1 and Ar 2 and Ar may each independently be a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms. 1 and Ar 2 At least one of them may each independently be a heteroaryl group including O or S as a ring-forming atom.

[0175] [Chemical formula Fb]

[0176]

[0177] In the chemical formula Fb, R a and R bmay each independently be a hydrogen atom, a deuterium atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, or may combine with an adjacent group to form a ring. In the chemical formula Fb, Ar 1 To Ar 4 and Ar may each independently be a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms. 1 To Ar 4 At least one of may be a heteroaryl group including O or S as a ring-forming atom.

[0178] In the chemical formula Fb, U and V may each independently be a substituted or unsubstituted hydrocarbon ring having 5 to 30 ring carbon atoms or a substituted or unsubstituted heterocyclic ring having 2 to 30 ring carbon atoms.

[0179] In the chemical formula Fb, the number of rings represented by U and V may be 0 or 1 independently. When the number of U or V is 1, a condensed ring may be present in the portion indicated by U or V, and in the case where the number of U or V is 0, a condensed ring may not be present in the portion indicated by U or V. In the case where the number of U is 0 and the number of V is 1, or in the case where the number of U is 1 and the number of V is 0, the condensed ring having a fluorene core of the chemical formula Fb may be a cyclic compound having four rings. In the case where the number of U and V is each 0, the condensed ring having a fluorene core of the chemical formula Fb may be a cyclic compound having three rings. In the case where the number of U and V is each 1, the condensed ring having a fluorene core of the chemical formula Fb may be a cyclic compound having five rings.

[0180] [Chemical formula Fc]

[0181]

[0182] In the chemical formula Fc, A 1 and A 2 can be independently O, S, Se or NR m ; and R m It may be a hydrogen atom, a deuterium atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms. 1 To R 11Each may independently be a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted boron group, a substituted or unsubstituted oxy group, a substituted or unsubstituted thiol group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring-forming carbon atoms, or may combine with an adjacent group to form a ring.

[0183] In the chemical formula Fc, A 1 and A 2 Each of them can independently combine with the substituent of the adjacent ring to form a condensed ring. 1 and A 2 Each independently is NR m In the case of A 1 Can be used with R 4 or R 5 Combine to form a fused ring. For example, A 2 R 7 and R 8 Combine to form a fused ring.

[0184] In an embodiment, the third light-emitting layer EML-B may include a styryl derivative (e.g., 1,4-bis[2-(3-N-ethylcarbazolyl)vinyl]benzene (BCzVB), 4-(di-p-tolylamino)-4'-[(di-p-tolylamino)styryl]stilbene (DPAVB), N-(4-((E)-2-(6-((E)-4-(diphenylamino)styryl)naphthalene-2-yl)vinyl)phenyl)-N-phenylaniline (N-BDAVBi) or 4,4'-bis[2-(4-(N,N-diphenylamino)phenyl)vinyl]biphenyl (DPAVBi)), perylene or a derivative thereof (e.g., 2,5,8,11-tetra-tert-butylperylene (TBP)), pyrene or a derivative thereof (e.g., 1,1'-dipyrene, 1,4-dipyrenylbenzene or 1,4-bis(N,N-diphenylamino)pyrene), etc. as dopant materials in the related art.

[0185] In an embodiment, the third light-emitting layer EML-B may include a phosphorescent dopant material of the related art. For example, a metal complex including iridium (Ir), platinum (Pt), osmium (Os), gold (Au), titanium (Ti), zirconium (Zr), hafnium (Hf), europium (Eu), terbium (Tb) or thulium (Tm) may be used as a phosphorescent dopant. For example, FIrpic (bis (4,6-difluorophenylpyridyl-N, C2') picolinyl iridium (III)), FIr6 (bis (2,4-difluorophenylpyridyl) -tetrakis (1-pyrazolyl) borate iridium (III)) or PtOEP (octaethylporphyrin platinum) may be used as a phosphorescent dopant, but the embodiment is not limited thereto.

[0186] at the same time, Figure 4 It is explained that in the display device DD according to the embodiment, the first to third light-emitting elements ED-1, ED-2, and ED-3 have the same thickness of the first to third light-emitting layers EML-R, EML-G, and EML-B, but the embodiment of the inventive concept is not limited thereto. For example, in the embodiment, the first to third light-emitting elements ED-1, ED-2, and ED-3 may have different thicknesses from each other.

[0187] In the light emitting element ED according to the embodiment, an electron transport region ETR is provided on the first to third light emitting layers EML-R, EML-G and EML-B. The electron transport region ETR may include at least one of an electron transport layer and an electron injection layer, but the embodiment is not limited thereto.

[0188] The electron transport region ETR may have a structure having a single layer composed of a single material, a single layer composed of a plurality of different materials, or a plurality of layers composed of a plurality of different materials. For example, the electron transport region ETR may have a structure having a single layer composed of an electron injection layer or an electron transport layer, or a structure having a single layer composed of an electron injection material and an electron transport material. For example, the electron transport region ETR may have a thickness of about 20 nm to about 150 nm.

[0189] The electron transport region ETR may be formed using various methods such as vacuum deposition, spin coating, casting, LB (Langmuir-Blodgett) method, inkjet printing, laser printing, or laser induced thermal imaging (LITI) method.

[0190] In an embodiment, the electron transport region ETR may include an anthracene compound, Alq 3 (tris(8-hydroxyquinoline)aluminum), 1,3,5-tris[(3-pyridyl)-phenyl-3-yl]benzene, 2,4,6-tris(3'-(pyridin-3-yl)biphenyl-3-yl)-1,3,5-triazine, DPEPO (bis[2-(diphenylphosphino)phenyl]ether oxide), 2-(4-(N-phenylbenzimidazol-1-yl)phenyl)-9,10-dinaphthothracene, TPBi (1,3,5-tris(1-phenyl-1H-benzo[d]imidazol-2-yl)benzene) or a mixture thereof. In another embodiment, the electron transport region ETR may include a metal halide (such as LiF, NaCl, CsF, RbCl or RbI), a lanthanide metal (such as Yb), a metal oxide (such as Li 2 O, BaO) or Liq (lithium quinoline), etc.

[0191] The second electrode EL2 may be a common electrode. The second electrode EL2 may be an anode or a cathode, but the embodiment is not limited thereto. For example, when the first electrode EL1 is an anode, the second electrode EL2 may be a cathode, and when the first electrode EL1 is a cathode, the second electrode EL2 may be an anode. The second electrode may include at least one of Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF, Mo, Ti, W, In, Sn, and Zn, a compound selected from two or more of these, a mixture selected from two or more of these, or an oxide thereof.

[0192] The second electrode EL2 may be a transmissive electrode, a semi-transmissive electrode or a reflective electrode. When the second electrode EL2 is a transmissive electrode, the second electrode EL2 may be formed of a transparent conductive oxide (e.g., indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO) or indium tin zinc oxide (ITZO), etc.).

[0193] In the case where the second electrode EL2 is a semi-transmissive electrode or a reflective electrode, the second electrode EL2 may include at least one of Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF, Mo, Ti, Yb and W, a compound thereof or a mixture thereof (e.g., AgMg, AgYb or MgYb), or a material having a multilayer structure such as LiF / Ca (a stacked structure of LiF and Ca) or LiF / Al (a stacked structure of LiF and Al). In an embodiment, the second electrode EL2 may have a multilayer structure including a reflective film or a semi-transmissive film formed of the above materials, and a transparent conductive film formed of indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO) or indium tin zinc oxide (ITZO), etc. For example, the second electrode EL2 may include a metal material as described above, a combination of at least two of the metal materials as described above, or an oxide of the metal material as described above.

[0194] The encapsulation layer TFE may be disposed on the first to third light emitting elements ED-1, ED-2, and ED-3 to cover the first to third light emitting elements ED-1, ED-2, and ED-3. The encapsulation layer TFE may be a single layer or may be formed by stacking a plurality of layers. The encapsulation layer TFE may be a thin film encapsulation layer. The encapsulation layer TFE may protect the first to third light emitting elements ED-1, ED-2, and ED-3. The thin film encapsulation layer TFE may cover the upper surface of the second electrode EL2 disposed in the opening OH and may fill the opening OH.

[0195] The display device DD according to the embodiment may include an optical layer PP. The optical layer PP may be disposed on the display panel DP. The optical layer PP may include a color filter layer CFL and an optical structure layer BL disposed on the color filter layer CFL.

[0196] The optical structure layer BL may block external light supplied from the outside of the display device DD to the display panel DP. The optical structure layer BL may be a reflection reducing layer that reduces the reflectivity of the external light. For example, the optical structure layer BL may include a polarizing film including a retarder and / or a polarizer, a multilayer reflective layer that offsets interference reflected light, or a color filter arranged corresponding to the pixel arrangement and the color of light emitted by the pixels included in the display panel DP. In the case where the optical structure layer BL includes a color filter, the color filter may be arranged in consideration of the color of light emitted by the pixels included in the display panel DP. In addition, in an embodiment, the optical structure layer BL may be omitted.

[0197] The color filter layer CFL may include first to third color filters CF-R, CF-G, and CF-B, and a light blocking portion BM in which a light blocking opening OH-BM is defined.

[0198] The first to third color filters CF-R, CF-G, and CF-B may each include a polymer photosensitive resin and a colorant. The first to third color filters CF-R, CF-G, and CF-B may be disposed corresponding to the first to third light emitting regions PXA-R, PXA-G, and PXA-B, respectively. The first to third color filters CF-R, CF-G, and CF-B may be disposed in the light blocking openings OH-BM defined by the light blocking portion BM, respectively, to be divided from each other.

[0199] The color filter layer CFL includes a first color filter CF-R corresponding to the first light emitting area PXA-R and a second color filter CF-G corresponding to the second light emitting area PXA-G. The color filter layer CFL may include a first color filter CF-R that transmits the first light and a second color filter CF-G that transmits the second light. The first color filter CF-R may transmit red light, and the second color filter CF-G may transmit green light. In an embodiment, the first color filter CF-R may be a red color filter, and the second color filter CF-G may be a green color filter. The first color filter CF-R may include a red colorant, and the second color filter CF-G may include a green colorant. The first color filter CF-R may include a red pigment or a red dye, and the second color filter CF-G may include a green pigment or a green dye. For example, the first color filter CF-R and the second color filter CF-G may be yellow filters. The first color filter CF-R and the second color filter CF-G may be provided as a whole without being divided from each other.

[0200] The color filter layer CFL includes a third color filter CF-B corresponding to the third light emitting region PXA-B. The third color filter CF-B includes a colorant and scattering particles SN. The third color filter CF-B may include a blue colorant and scattering particles SN of a metal oxide.

[0201] The third color filter CF-B may include a scattering portion SP and a filter portion FP stacked in sequence. The third color filter CF-B may include a scattering portion SP and a filter portion FP disposed directly on the scattering portion SP. The third color filter CF-B may consist of a scattering portion SP and a filter portion FP stacked in sequence in the light-blocking opening OH-BM.

[0202] The third color filter CF-B may include a scattering portion SP including scattering particles SN. The scattering portion SP may have a thickness in the range of about 1 μm to about 4 μm. The scattering portion SP may include scattering particles SN that scatter light in a specific wavelength region without including a separate colorant (e.g., a pigment or dye). For example, since the scattering portion SP includes the scattering particles SN, the scattering portion SP may at least partially scatter the third light generated by the third light-emitting element ED-3. The scattering particles SN may include a metal oxide. The scattering particles SN may include at least one of zinc oxide, titanium oxide, and silicon oxide. For example, the scattering particles SN may contain titanium dioxide (TiO 2 ). However, the material of the scattering particles SN is not limited thereto, and the scattering particles SN may include various types of materials capable of scattering light. The third color filter CF-B according to the embodiment may include the scattering particles SN, and thus the third light may be scattered and emitted, thereby improving the luminous characteristics, color purity, and color reproducibility of the display device DD. Although the display device DD according to the embodiment includes an organic light-emitting material in the third light-emitting element ED-3 instead of quantum dots, the display device DD according to the embodiment may include the scattering particles SN in the third color filter CF-B, thereby improving the luminous characteristics, color purity, and color reproducibility of the display device DD. In addition, since the third color filter CF-B may include the scattering particles SN, the third light may be scattered, thereby improving the luminous characteristics of the third light not only in a direction parallel to the third direction DR3 but also in a direction inclined relative to the third direction DR3. That is, the third color filter CF-B may include the scattering particles SN, thereby improving the angle dependency (viewing angle enhancement) relative to the blue light as the third light.

[0203] The scattering portion SP may further include a polymer photosensitive resin. The scattering portion SP may include a polymer photosensitive resin and scattering particles SN dispersed in the polymer photosensitive resin. The scattering portion SP may be formed of a transparent polymer photosensitive resin, and the scattering particles SN are dispersed in the transparent polymer photosensitive resin. The polymer photosensitive resin included in the scattering portion SP may include the same material as the polymer photosensitive resin included in the filter portion FP or a material different from the polymer photosensitive resin included in the filter portion FP as needed.

[0204] The third color filter CF-B may include a filter portion FP including a colorant. The third color filter CF-B may include a filter portion FP that transmits the third light. The filter portion FP may be disposed on the scattering portion SP. The filter portion FP may transmit blue light. In an embodiment, the filter portion FP may be a blue color filter. The filter portion FP may include a blue colorant. For example, the filter portion FP may include a blue pigment or a blue dye. However, the embodiment is not limited thereto, and the filter portion FP may not include a pigment or a dye as required. The filter portion FP may include a polymer photosensitive resin, and may not include a pigment or a dye. The filter portion FP may be transparent. The filter portion FP may be formed of a transparent polymer photosensitive resin.

[0205] The color filter layer CFL may include a light blocking portion BM that distinguishes the boundaries of the adjacent first to third color filters CF-R, CF-G, and CF-B. The light blocking portion BM may be provided corresponding to the non-light emitting area NPXA provided between the first to third light emitting areas PXA-R, PXA-G, and PXA-B. The light blocking portion BM may have a function of preventing light leakage and color mixing. The light blocking portion BM may be formed of a blue color filter, or may be formed by including an organic light blocking material or an inorganic light blocking material containing a black pigment or a black dye. The light blocking portion BM may be a black matrix.

[0206] The color filter layer CFL may further include a buffer layer. For example, the buffer layer may be a protective layer for protecting the first to third color filters CF-R, CF-G, and CF-B. The buffer layer may be an inorganic material layer including at least one inorganic material of silicon nitride, silicon oxide, and silicon oxynitride. The buffer layer may be composed of a single layer or a plurality of layers as required.

[0207] FIG. 5A to FIG. 5D are cross-sectional views of display devices DD-a, DD-b, DD-c, and DD-d according to another embodiment, respectively. FIG. 5A to FIG. 5D Each explained along Figure 3 The section intercepted by line II-II' in FIG. 1 and the sections respectively illustrated with Figure 4 The display device DD explained in the figure is different from the display devices DD-a, DD-b, DD-c and DD-d according to another embodiment.

[0208] refer to Figure 5A , the third light-emitting element ED-3a may include a plurality of light-emitting layers EML-B1 and EML-B2. That is, the third light-emitting element ED-3a may be a light-emitting element having a series structure. For example, the third light-emitting element ED-3a may include a (3-1)th light-emitting layer EML-B1 disposed on the first electrode EL1, a charge generation layer OG disposed on the (3-1)th light-emitting layer EML-B1, and a (3-2)th light-emitting layer EML-B2 disposed on the charge generation layer OG.

[0209] When a voltage is applied, the charge generation layer OG can generate charges (electrons and holes) by forming a coordination complex through a redox reaction. The charge generation layer OG can increase the efficiency of the current generated by each of the adjacent light-emitting layers EML-B1 and EML-B2, and can be used to control the charge balance between the adjacent light-emitting layers EML-B1 and EML-B2. The charge generation layer OG may include an N-type aromatic amine material or a P-type metal oxide. For example, the charge generation layer OG may include a charge generation compound formed of an N-type aromatic amine organic compound, a carbazole compound, a metal, a metal oxide, a metal carbide, a metal fluoride, or a mixture thereof.

[0210] The charge generation layer OG may include a P-type charge generation layer and an N-type charge generation layer. The charge generation layer OG may have a stacked structure in which the P-type charge generation layer and the N-type charge generation layer are bonded to each other. The N-type charge generation layer may be a charge generation layer that supplies electrons to the light-emitting layers EML-B1 and EML-B2 adjacent thereto. The N-type charge generation layer may include an N-type dopant. The N-type charge generation layer may be a layer in which the N-type dopant is doped into a base material. The P-type charge generation layer may be a charge generation layer that supplies holes to the light-emitting layers EML-B1 and EML-B2 adjacent thereto. The P-type charge generation layer may include a P-type dopant. The P-type charge generation layer may be a layer in which the P-type dopant is doped into a base material. A buffer layer (not shown) may be further disposed between the N-type charge generation layer and the P-type charge generation layer.

[0211] and Figure 5A Different from what is explained in the specification, the third light-emitting element ED-3a may include n light-emitting layers and (n-1) charge generation layers disposed between adjacent light-emitting layers. In the specification, n may be an integer equal to or greater than 3.

[0212] refer to Figure 5B, the first to third light-emitting elements ED-1, ED-2 and ED-3 may include first to third electron transport regions ETR1, ETR2 and ETR3, respectively, and the first to third electron transport regions ETR1, ETR2 and ETR3 may be provided as pattern layers. In the present specification, a "common layer" may mean a layer that is generally provided to the entire first to third light-emitting elements ED-1, ED-2 and ED-3 and substantially constitutes one structure, and a "pattern layer" may mean a layer that is provided by patterning in an opening OH defined in a pixel defining film PDL and is spaced apart. The first to third electron transport regions ETR1, ETR2 and ETR3 may be provided as pattern layers on the light-emitting layers EML-1, EML-2 and EML-3, respectively, so as to correspond to the first to third light-emitting regions PXA-R, PXA-G and PXA-B, respectively.

[0213] The first electron transport region ETR1 and the second electron transport region ETR2 may each include an inorganic material. For example, the first electron transport region ETR1 and the second electron transport region ETR2 may each independently include a metal halide (such as LiF, NaCl, CsF, RbCl, or RbI), a lanthanide metal (such as Yb), a metal oxide (such as Li 2 O, BaO) or Liq (lithium quinoline), etc.

[0214] The third electron transport region ETR3 may include an organic material. For example, the third electron transport region ETR3 may include an anthracene compound, Alq 3 (tris(8-hydroxyquinoline)aluminum), 1,3,5-tris[(3-pyridyl)-phenyl-3-yl]benzene, 2,4,6-tris(3'-(pyridin-3-yl)biphenyl-3-yl)-1,3,5-triazine, DPEPO(bis[2-(diphenylphosphino)phenyl]ether oxide), 2-(4-(N-phenylbenzimidazol-1-yl)phenyl)-9,10-dinaphthothracene, TPBi(1,3,5-tris(1-phenyl-1H-benzo[d]imidazol-2-yl)benzene) or a mixture thereof.

[0215] In an embodiment, the first to third light emitting elements ED-1, ED-2, and ED-3 may further include a capping layer CPL disposed on the second electrode EL2. The capping layer CPL may be an organic layer or an inorganic layer. For example, when the capping layer CPL includes an inorganic material, the inorganic material may include an alkali metal compound (such as LiF), an alkaline earth metal compound (such as MgF 2 )、SiON、SiN x or SiO yFor example, in the case where the capping layer CPL includes an organic material, the organic material may include N,N'-bis(1-naphthyl)-N,N'-bis(phenyl)-2,2'-dimethylbenzidine (α-NPD), NPB, TPD, m-MTDATA, Alq 3 , CuPc, TPD15 (N4,N4,N4',N4'-tetrakis(biphenyl-4-yl)biphenyl-4,4'-diamine) or TCTA (4,4',4"-tris(N-carbazolyl)triphenylamine), etc., or may include epoxy resins or acrylate resins (such as methacrylate resins). The capping layer CPL may have a refractive index equal to or greater than about 1.6. For example, with respect to light in a wavelength range of about 550nm to about 600nm, the capping layer CPL may have a refractive index equal to or greater than about 1.6.

[0216] refer to Figure 5C , the encapsulation layer TFE may have a multilayer structure in which an inorganic layer / organic layer is repeated. In an embodiment, the encapsulation layer TFE may include a first inorganic encapsulation layer IOL1 / organic encapsulation layer OL / second inorganic encapsulation layer IOL2. The first inorganic encapsulation layer IOL1 and the second inorganic encapsulation layer IOL2 may protect the first to third light-emitting elements ED-1, ED-2, and ED-3 from external moisture, and the organic encapsulation layer OL may prevent the first to third light-emitting elements ED-1, ED-2, and ED-3 from having dent defects due to foreign matter introduced in the manufacturing process. The first inorganic encapsulation layer IOL1 and the second inorganic encapsulation layer IOL2 protect the display element layer DP-EL from moisture / oxygen, and the organic encapsulation layer OL protects the display element layer DP-EL from foreign matter such as dust particles. The first inorganic encapsulation layer IOL1 and the second inorganic encapsulation layer IOL2 may each include silicon nitride, silicon oxynitride, silicon oxide, titanium oxide, aluminum oxide, etc., but the embodiment is not limited thereto. The organic encapsulation layer OL may include an acrylic compound or an epoxy compound, etc. The organic encapsulation layer OL may include a photopolymerizable organic material, but the embodiment is not limited thereto. Figure 5C In the embodiment, the display panel DP may further include a refractive index control layer (not shown) on the encapsulation layer TFE for improving light emitting efficiency.

[0217] refer to Figure 5D, the optical layer PP-1 may include a color filter layer CFL-1, and the color filter layer CFL-1 may further include an outer coating layer OC. The outer coating layer OC may be disposed on the first to third color filters CF-R, CF-G, and CF-B. The outer coating layer OC may be an organic layer that protects the first to third color filters CF-R, CF-G, and CF-B. The outer coating layer OC may cover the first to third color filters CF-R, CF-G, and CF-B, and may flatten the upper surfaces of the first to third color filters CF-R, CF-G, and CF-B. In an embodiment, a glass substrate for protecting the outer coating layer OC may be further disposed on the outer coating layer OC, and an adhesive layer may be disposed between the outer coating layer OC and the glass substrate. The outer coating layer OC may include a photocurable organic material or a thermally curable organic material. However, the material included in the outer coating layer OC is not limited thereto, and the outer coating layer OC may include an inorganic material.

[0218] The light emitting element in the display device according to the embodiment may include a light emitting layer including an organic light emitting material and a color filter including scattering particles, thereby improving light emitting characteristics and lifespan of the light emitting element in the display device.

[0219] In the above, the embodiments described herein have been described with reference to the above, but those skilled in the art or those of ordinary skill in the relevant technical field can understand that various modifications and changes can be made to the embodiments without departing from the spirit and technical scope of the present disclosure described in the claims. Therefore, the technical scope of the present disclosure is not limited to the contents described in the detailed description of the specification, but should be determined by the claims.

Claims

1. A display device, comprising: Basal layer; A circuit layer disposed on the base layer; A display element layer disposed on the circuit layer and including a light-emitting element; as well as An optical layer is provided on the display element layer, wherein The light emitting element comprises: a first light-emitting element overlapping the first light-emitting region and including a first light-emitting layer; a second light-emitting element overlapping the second light-emitting region and including a second light-emitting layer; and a third light-emitting element overlapping the third light-emitting region and including a third light-emitting layer, The first light-emitting layer and the second light-emitting layer include first quantum dots and second quantum dots, respectively. The third light-emitting layer includes an organic light-emitting material, and The optical layer comprises: a first color filter overlapping the first light emitting area; a second color filter overlapping the second light emitting region; and A third color filter overlaps the third light emitting region and includes scattering particles. 2 . The display device according to claim 1 , wherein the scattering particles include at least one of zinc oxide, titanium oxide, and silicon oxide.

3. The display device according to claim 1, wherein the third color filter comprises: a scattering portion disposed on the display element layer and including the scattering particles; as well as A filter portion is disposed on the scattering portion and includes a colorant. 4 . The display device of claim 3 , wherein the scattering portion further comprises a polymer photosensitive resin, and the scattering particles are distributed in the polymer photosensitive resin.

5. The display device according to claim 1, wherein The first to third light emitting elements generate first to third lights, respectively, and The third light is blue light having a central wavelength within a range of 420 nm to 480 nm.

6. The display device according to claim 1, wherein The first light emitting layer includes a first host and a first dopant, The second light emitting layer includes a second host and a second dopant, The third light-emitting layer includes a third host and a third dopant, The first dopant includes the first quantum dot, The second dopant includes the second quantum dot, and The third host and the third dopant each include the organic light emitting material.

7. The display device according to claim 1, wherein The light emitting element comprises: a first electrode; a light-emitting layer disposed on the first electrode; as well as a second electrode disposed on the light-emitting layer, and The light-emitting layer includes the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer.

8. The display device according to claim 7, wherein The first light-emitting element further includes a first electron transport region disposed on the first light-emitting layer, The second light-emitting element further includes a second electron transport region disposed on the second light-emitting layer, The third light-emitting element further includes a third electron transport region disposed on the third light-emitting layer, The first electron transport region and the second electron transport region each include an inorganic material, and The third electron transport region includes an organic material.

9. The display device according to claim 7, wherein The third light-emitting layer comprises: A (3-1) light-emitting layer disposed on the first electrode; as well as A (3-2) light-emitting layer is provided on the (3-1) light-emitting layer, and The third light-emitting element further includes a charge generation layer provided between the (3-1)th light-emitting layer and the (3-2)th light-emitting layer.

10. A display device, comprising: Basal layer; A circuit layer disposed on the base layer; A display element layer disposed on the circuit layer and including a light-emitting element; as well as An optical layer is provided on the display element layer, wherein The light emitting element includes an organic light emitting material, and The optical layer comprises: a scattering portion comprising titanium dioxide; as well as A filter portion is disposed directly on the scattering portion and includes a pigment or dye.

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