Display device

Abstract

The display device includes a first light-emitting area and a second light-emitting area; a first pixel electrode and a second pixel electrode in the first light-emitting area and the second light-emitting area, respectively; a first organic layer in the first light-emitting area, the first organic layer including a first light-emitting layer and a second light-emitting layer; a second organic layer in the second light-emitting area, the second organic layer including a third light-emitting layer; a common electrode on the first organic layer and the second organic layer; a wavelength conversion pattern on the common electrode, the wavelength conversion pattern overlapping the first organic layer and converting the wavelength of light of a first color into light of a second color different from the first color; and a light-transmitting pattern on the common electrode, the light-transmitting pattern overlapping the second organic layer. The third light-emitting layer and one of the first light-emitting layer and the second light-emitting layer emit light of the first color, and the other of the first light-emitting layer and the second light-emitting layer emits light of the second color.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] Korean Patent Application No. 10-2018-0110906, entitled “DISPLAY DEVICE”, filed on September 17, 2018 in the Korean Intellectual Property Office, is incorporated herein by reference in its entirety. Technical Field

[0003] Embodiments relate to a display device. Background Art

[0004] The importance of display devices has increased with the development of multimedia. Various types of display devices have been developed. Among these, an organic light-emitting display device includes an organic light-emitting element, that is, a self-luminous element. The organic light-emitting element includes two electrodes facing each other and an organic light-emitting layer inserted therebetween. Electrons and holes provided from the two electrodes recombine in the organic light-emitting layer to generate excitons, and the generated excitons are transformed from an excited state to a ground state to emit light.

[0005] Organic light emitting display devices do not require an additional light source, thereby producing low power consumption, thin and lightweight display devices having high quality characteristics, such as wide viewing angle, high brightness, contrast, etc., and fast response time. Therefore, organic light emitting display devices have received widespread attention as next generation display devices.

[0006] Implementing full-color display in an organic light-emitting display device may include using organic light-emitting elements that output different colors or using organic light-emitting elements that output a single color and provide a color conversion pattern to obtain additional colors. Summary of the invention

[0007] An embodiment of the display device includes a first light-emitting area and a second light-emitting area; a first pixel electrode in the first light-emitting area; a second pixel electrode in the second light-emitting area; a first organic layer in the first light-emitting area, the first organic layer including a first light-emitting layer on the first pixel electrode and a second light-emitting layer on the first light-emitting layer; a second organic layer in the second light-emitting area, the second organic layer including a third light-emitting layer on the second pixel electrode; a common electrode on the first organic layer and the second organic layer; a first wavelength conversion pattern on the common electrode, the first wavelength conversion pattern overlapping the first organic layer and converting the wavelength of light of a first color into light of a second color different from the first color; and a light-transmitting pattern on the common electrode and overlapping the second organic layer, wherein the third light-emitting layer emits light of the first color, one of the first light-emitting layer and the second light-emitting layer emits light of the first color, the other of the first light-emitting layer and the second light-emitting layer emits light of the second color, and the first organic layer does not emit light of a third color having a longer peak wavelength than the first color and the second color.

[0008] An embodiment of a display device includes a light-emitting area; a pixel electrode in the light-emitting area; an organic layer on the pixel electrode, the organic layer including a first light-emitting layer, a second light-emitting layer overlapping the first light-emitting layer, and a third light-emitting layer overlapping the first light-emitting layer and the second light-emitting layer; a common electrode on the organic layer; a wavelength conversion pattern, which is on the common electrode and converts the wavelength of blue light into green light; and a blue light blocking filter on the wavelength conversion pattern, wherein any one of the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer emits green light, and the other two of the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer emit blue light. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Features will become apparent to those skilled in the art by describing exemplary embodiments in more detail with reference to the accompanying drawings, in which:

[0010] Figure 1 A perspective view illustrating a display device according to an embodiment;

[0011] Figure 2 Explains along the Figure 1 A schematic cross-sectional view of the display device taken along line X1-X1' in FIG.

[0012] Figure 3 Explained Figure 1 and Figure 2 A schematic plan view of a display device shown in ;

[0013] Figure 4 Explains along the Figure 3 A cross-sectional view of the display device taken along line X3-X3';

[0014] Figure 5 Explained Figure 4 An enlarged cross-sectional view of a portion Q1 in FIG.

[0015] Figure 6 Explains the display Figure 5 A cross-sectional view of a modified example of the structure shown in;

[0016] Figure 7 Explains the display Figure 5 A cross-sectional view of another modified example of the structure shown in;

[0017] Figure 8 Explained Figure 4 An enlarged cross-sectional view of a portion Q2 in FIG.

[0018] Fig. 9 Explains the display Figure 8 A cross-sectional view of a modified example of the structure shown in;

[0019] Fig.10 Explained Figure 4 An enlarged cross-sectional view of a portion Q3 in FIG.

[0020] Fig.11 Explains the display Fig.10 A cross-sectional view of a modified example of the structure shown in;

[0021] Fig.12 Explains the display Fig.10 A cross-sectional view of another modified example of the structure shown in;

[0022] Fig.13 Explains along the Figure 3 A cross-sectional view of a display device according to another embodiment taken along line X3-X3'; and

[0023] Figures 14 to 27 Explains along the Figure 3 A cross-sectional view of a display device according to other embodiments taken along line X3 - X3 ′ in FIG. DETAILED DESCRIPTION

[0024] Example embodiments will now be described more fully below with reference to the accompanying drawings; however, they may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey exemplary implementations to those skilled in the art.

[0025] It should be understood that when an element or layer is referred to as being "on," "connected to," or "coupled to" another element or layer, it may be directly on, directly connected to, or coupled to another element or layer, or there may be intervening elements or layers. In contrast, when an element is referred to as being "directly" "on," "directly connected to," or "directly coupled to" another element or layer, there are no intervening elements or layers. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0026] For ease of description, spatially relative terms, such as "below", "below", "below", "above", "on", etc., may be used herein to describe the relationship between an element or feature and another element (or elements) or feature (or features) as illustrated in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, the elements described as "below" or "below" other elements or features will be oriented "above" the other elements or features. Therefore, the exemplary term "below" may include both above and below orientations. The device can be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein can be interpreted accordingly.

[0027] It should be understood that although the terms first, second, etc. can be used in this article to describe various elements, components, areas, layers and / or cross-sections, these elements, components, areas, layers and / or cross-sections are not limited by these terms. These terms are only used to distinguish one element, component, area, layer or cross-section from another element, component, area, layer or cross-section. Therefore, without departing from the teachings of this article, the first element, component, area, layer or cross-section discussed below can be referred to as the second element, component, area, layer or cross-section.

[0028] The embodiments to be described herein will be described with reference to idealized schematic plan views and cross-sectional views. Therefore, the illustrations may be modified depending on manufacturing techniques and / or tolerances. Therefore, the embodiments are not limited to a particular form and also include variations caused by manufacturing processes. Therefore, the regions illustrated in the figures have schematic properties and the shapes of the regions illustrated in the figures are intended to illustrate regions of a particular type of element.

[0029] Hereinafter, embodiments will be described with reference to the accompanying drawings.

[0030] Figure 1 is a perspective view of a display device according to an embodiment. Figure 2 It is along Figure 1 A cross-sectional view of the display device taken along line X1-X1' in FIG. Figure 3 yes Figure 1 and Figure 2A plan view of the display device shown in FIG.

[0031] refer to Figures 1 to 3 The display device 1 can be applied to various electrical appliances, such as tablet PCs, smart phones, car navigation units, cameras, central information displays (CIDs) of cars, watch-type electronic devices, personal digital assistants (PDAs), portable multimedia players (PMPs), game consoles, televisions, outdoor billboards, monitors, personal computers, notebook computers, etc.

[0032] In some embodiments, in a plan view, the display device 1 may have a rectangular shape, a circular shape, a polygonal shape, etc. The display device 1 may include two short sides extending in a first direction D1 and two long sides extending in a second direction D2 intersecting the first direction D1. The angle at which the long side and the short side of the display device 1 meet each other may be a right angle, an oblique angle, a curved surface, etc.

[0033] The display device 1 may include a display area DA that displays an image and a non-display area NDA that does not display an image. A plurality of light-emitting areas PA1, PA2, and PA3 and a non-light-emitting area PB may be defined in the display area DA. In some embodiments, in a plan view, the first light-emitting area PA1, the second light-emitting area PA2, and the third light-emitting area PA3 may form a matrix. The non-light-emitting area PB may be defined between light-emitting areas adjacent to each other. In some embodiments, the plurality of light-emitting areas PA1, PA2, and PA3 and the non-light-emitting area PB may be defined by a pixel defining film of the first substrate 10 described later.

[0034] In some embodiments, the first light emitting area PA1 emits light of a first color, for example, red light with a peak wavelength in a range of about 610nm to about 650nm; the second light emitting area PA2 emits light of a second color different from the first color, for example, green light with a peak wavelength in a range of about 510nm to about 550nm; and the third light emitting area PA3 emits light of a third color different from the first color and the second color, for example, blue light with a peak wavelength in a range of about 430nm to about 470nm. Alternatively, the first light emitting area PA1 may emit green light, and the second light emitting area PA2 may emit red light. Hereinafter, for ease of explanation, the light emitted by the first light emitting area PA1 is referred to as the first outgoing light, the light emitted by the second light emitting area PA2 is referred to as the second outgoing light, and the light emitted by the third light emitting area PA3 is referred to as the third outgoing light. In addition, the case where the first color is red, the second color is green, and the third color is blue is exemplarily described.

[0035] The laminated structure of the display device 1 will be described, for example, in which layers are stacked along a third direction D3 intersecting the first direction D1 and the second direction D2. In some embodiments, the display device 1 includes a first substrate 10 along the third direction D3 and a second substrate 30 facing the first substrate 10, and may further include a sealing portion 50 coupling the first substrate 10 and the second substrate 30, and a filler 70 between the first substrate 10 and the second substrate 30.

[0036] The first substrate 10 may include elements and circuits for displaying images, for example, pixel circuits such as switching elements; pixel defining films defining light-emitting areas PA1, PA2, and PA3 and non-light-emitting areas PB in the display area DA; and organic light-emitting elements. That is, in some embodiments, the first substrate 10 may be a display substrate.

[0037] The second substrate 30 may be above the first substrate 10, for example, overlap the first substrate 10 along the third direction D3, and face the first substrate 10. In some embodiments, the second substrate 30 may include a color conversion pattern for converting the color of incident light. That is, in some embodiments, the second substrate 30 may be a color conversion substrate.

[0038] In the non-display area NDA, the sealing portion 50 may be between the first substrate 10 and the second substrate 30. On a plane, the sealing portion 50 may be along edges, e.g., peripheries, of the first substrate 10 and the second substrate 30 in the non-display area NDA to surround the display area DA. The first substrate 10 and the second substrate 30 may be coupled to each other via the sealing portion 50.

[0039] In some embodiments, the sealing portion 50 may be made of an organic material, such as epoxy resin, etc. The space between the first substrate 10 and the second substrate 30 and surrounded by the sealing portion 50 may be filled with a filler 70. The filler 70 may fill the space between the first substrate 10 and the second substrate 30. In some embodiments, the filler 70 may be a light-transmitting material. In some embodiments, the filler 70 may be an organic material, such as a Si-based organic material, an epoxy-based organic material, etc.

[0040] Reference Figures 4 to 12 The structure of the display device 1 is described in more detail. Figure 4 It is along Figure 3 A cross-sectional view of the display device taken along line X3-X3'. Figure 5 yes Figure 4 An enlarged cross-sectional view of portion Q1 in FIG. Figure 6 Yes Display Figure 5 A cross-sectional view of a modified example of the structure shown in FIG. Figure 7 Yes Display Figure 5 A cross-sectional view of another modified example of the structure shown in FIG. Figure 8yes Figure 4 An enlarged cross-sectional view of portion Q2 in FIG. Fig. 9 Yes Display Figure 8 A cross-sectional view of a modified example of the structure shown in FIG. Fig.10 yes Figure 4 An enlarged cross-sectional view of portion Q3 in FIG. Fig.11 Yes Display Fig.10 A cross-sectional view of a modified example of the structure shown in FIG. Fig.12 Yes Display Fig.10 A cross-sectional view of another modified example of the structure shown in FIG.

[0041] refer to Figures 4 to 12 As described above, the display device 1 includes the first substrate 10 and the second substrate 30 , and may further include a filler 70 interposed between the first substrate 10 and the second substrate 30 .

[0042] Hereinafter, the first substrate 10 will be described in more detail.

[0043] The first base portion 110 may be made of a material having light transmittance. In some embodiments, the first base portion 110 may be a glass substrate or a plastic substrate.

[0044] In some embodiments, the first substrate 10 may define a first light emitting area PA1, a second light emitting area PA2, a third light emitting area PA3, and a non-light emitting area PB.

[0045] The switching elements T1, T2, and T3 may be on the first base portion 110. In some embodiments, the first switching element T1 may be in the first light emitting area PA1, the second switching element T2 may be in the second light emitting area PA2, and the third switching element T3 may be in the third light emitting area PA3. In another embodiment, at least one of the first switching element T1, the second switching element T2, and the third switching element T3 may be in the non-light emitting area PB. A plurality of signal lines, for example, gate lines, data lines, and power lines, which transmit signals to the respective switching elements, may be further on the first base portion 110.

[0046] The insulating film 130 may be on the first switching element T1, the second switching element T2, and the third switching element T3. In some embodiments, the insulating film 130 may be a planarization film. In some embodiments, the insulating film 130 may be an organic film, for example, acrylic resin, epoxy resin, imide resin, ester resin, etc. In some embodiments, the insulating film 130 may include a positive photosensitive material or a negative photosensitive material.

[0047] The first pixel electrode AE1, the second pixel electrode AE2, and the third pixel electrode AE3 may be on the insulating film 130. The first pixel electrode AE1 may be located in the first light emitting area PA1, and at least a portion of the first pixel electrode AE1 may extend to the non-light emitting area PB, for example, at both sides of the non-light emitting area PB. The second pixel electrode AE2 may be located in the second light emitting area PA2, and at least a portion of the second pixel electrode AE2 may extend to the non-light emitting area PB, for example, at both sides of the non-light emitting area PB. The third pixel electrode AE3 may be located in the third light emitting area PA3, and at least a portion of the third pixel electrode AE3 may extend to the non-light emitting area PB, for example, at both sides of the non-light emitting area PB. The first pixel electrode AE1, the second pixel electrode AE2, and the third pixel electrode AE3 may each extend downward through the insulating film 130 along the third direction D3 to be connected to the first switching element T1, the second switching element T2, and the third switching element T3, respectively.

[0048] In some embodiments, each of the first pixel electrode AE1, the second pixel electrode AE2, and the third pixel electrode AE3 may be an anode. The first pixel electrode AE1, the second pixel electrode AE2, and the third pixel electrode AE3 may be a reflective electrode. In this case, each of the first pixel electrode AE1, the second pixel electrode AE2, and the third pixel electrode AE3 may be a metal layer including a metal, for example, Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, etc. In another embodiment, each of the first pixel electrode AE1, the second pixel electrode AE2, and the third pixel electrode AE3 may further include a metal oxide layer laminated on the metal layer. In an exemplary embodiment, each of the first pixel electrode AE1, the second pixel electrode AE2, and the third pixel electrode AE3 may have a two-layer structure of ITO / Ag, Ag / ITO, ITO / Mg, ITO / MgF, etc., or a multi-layer structure of ITO / Ag / ITO, etc.

[0049] The pixel defining film 150 may be on the first pixel electrode AE1, the second pixel electrode AE2, and the third pixel electrode AE3. The pixel defining film 150 may include an opening exposing the first pixel electrode AE1, an opening exposing the second pixel electrode AE2, and an opening exposing the third pixel electrode AE3. The pixel defining film 150 may define the first light emitting area PA1, the second light emitting area PA2, the third light emitting area PA3, and the non-light emitting area PB. In particular, the exposed area of ​​the first pixel electrode AE1 not covered by the pixel defining film 150 may be the first light emitting area PA1. Similarly, the exposed area of ​​the second pixel electrode AE2 not covered by the pixel defining film 150 may be the second light emitting area PA2, and the exposed area of ​​the third pixel electrode AE3 not covered by the pixel defining film 150 may be the third light emitting area PA3. The area where the pixel defining film 150 is provided may be the non-light emitting area PB. In some embodiments, the pixel defining film 150 may include an organic insulating material, for example, polyacrylate resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, unsaturated polyester resin, polyparaphenylene resin, polyphenylene sulfide resin, benzocyclobutene (BCB), or the like.

[0050] In the first emission area PA1, the first organic layer OL1 may be on the first pixel electrode AE1. In addition, in the second emission area PA2, the second organic layer OL2 may be on the second pixel electrode AE2. In addition, in the third emission area PA3, the third organic layer OL3 may be on the third pixel electrode AE3. The first organic layer OL1, the second organic layer OL2, and the third organic layer OL3 may be in the opening of the pixel defining film 150 defining the first emission area PA1, the second emission area PA2, and the third emission area PA3, respectively. Details of the first organic layer OL1, the second organic layer OL2, and the third organic layer OL3 will be described later.

[0051] The common electrode CE may be on the first organic layer OL1 , the second organic layer OL2 , and the third organic layer OL3 , for example, may continuously extend thereon. In some embodiments, the common electrode CE may be a cathode.

[0052] In some embodiments, the common electrode CE may have semi-transmittance or transmissivity to light. When the common electrode CE has semi-transmittance to light, the common electrode CE may include Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF / Ca, LiF / Al, Mo, Ti, etc., or a compound or mixture thereof, for example, a mixture of Ag and Mg. In addition, when the thickness of the common electrode CE is tens of angstroms to hundreds of angstroms, the common electrode CE may have semi-transmittance to light. When the common electrode CE has transmissivity to light, the common electrode CE may include a transparent conductive oxide (TCO), for example, tungsten oxide (WO x ), titanium oxide (TiO 2), indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium tin zinc oxide (ITZO), magnesium oxide (MgO), etc.

[0053] The first pixel electrode AE1, the first organic layer OL1 and the common electrode CE may constitute a first organic light emitting element ED1, the second pixel electrode AE2, the second organic layer OL2 and the common electrode CE may constitute a second organic light emitting element ED2, and the third pixel electrode AE3, the third organic layer OL3 and the common electrode CE may constitute a third organic light emitting element ED3. The first organic light emitting element ED1 may emit a first light L1, the second organic light emitting element ED2 may emit a second light L2, and the third organic light emitting element ED3 may emit a third light L3.

[0054] As described above, the first organic layer OL1 may be between the first pixel electrode AE1 and the common electrode CE. Figure 5 As shown, the first organic layer OL1 may include a first hole transport layer HTL1 on the first pixel electrode AE1 , a first light emitting layer EL11 on the first hole transport layer HTL1 , and a first electron transport layer ETL1 on the first light emitting layer EL11 .

[0055] The first hole transport layer HTL1 includes a hole transport material. Examples of the hole transport material may include carbazole derivatives such as N-phenylcarbazole and polyvinylcarbazole; fluorene derivatives; triphenylamine derivatives such as TPD (N, N'-bis (3-methylphenyl) -N, N'-diphenyl - [1, 1-biphenyl] -4, 4'-diamine) and TCTA (4, 4', 4"-tri (N-carbazolyl) triphenylamine); and NPB (N, N'-di (1-naphthyl) -N, N'-diphenyl benzidine) and TAPC (4, 4'-cyclohexylene bis [N, N-bis (4-methylphenyl) aniline]).

[0056] In some embodiments, a hole injection layer (not shown) may be between the first pixel electrode AE1 and the first hole transport layer HTL1. The hole injection layer may include a phthalocyanine compound, for example, copper phthalocyanine; and a hole injection material, for example, DNTPD (N,N'-diphenyl-N,N'-bis-[4-(phenyl-m-tolyl-amino)-phenyl]-biphenyl-4,4'-diamine), m-MTDATA (4,4',4"-tris(3-methylphenylphenylamino)triphenylamine), TDATA (4,4'4"-tris(N,N-diphenylamino)triphenylamine), 2-TNATA (4,4',4"-tris{N-(2-naphthyl)-N-phenylamino}-triphenylamine), PEDOT / PSS (poly(3,4-ethylenedioxythiophene) / poly(4-styrenesulfonate)), PANI / DBSA (polyaniline / dodecylbenzenesulfonic acid), PANI / CSA (polyaniline / camphorsulfonic acid) or PANI / PSS (polyaniline) / poly(4-styrenesulfonate).

[0057] In an embodiment, the hole injection layer may further include a charge generating material for improving conductivity. The charge generating material may be, for example, a p-type dopant, and the p-type dopant may be one of a quinone derivative, a metal oxide, and a cyano group-containing compound. In another embodiment, the p-type dopant may include a quinone derivative, such as TCNQ (tetracyanoquinodimethane) and F 4 -TCNQ (2,3,5,6-tetrafluoro-tetracyanoquinodimethane); and metal oxides such as tungsten oxide and molybdenum oxide.

[0058] The first light-emitting layer EL11 may be on the first hole transport layer HTL1. The first light-emitting layer EL11 may emit light of a third color, for example, blue light. In some embodiments, the blue light emitted by the first light-emitting layer EL11 may have a peak wavelength in the range of 430 nm to 470 nm. That is, in some embodiments, the first light-emitting layer EL11 may be a blue light-emitting layer. In some embodiments, the first light-emitting layer EL11 may include a host and a dopant. The host may be any commonly used material, for example, Alq 3 (tris(8-hydroxyquinoline)aluminum), CBP(4,4'-bis(N-carbazolyl)-1,1'-biphenyl), PVK(poly(N-vinylcarbazole)), ADN(9,10-di(naphthalene-2-yl)anthracene), TCTA(4,4',4"-tri(N-carbazolyl)triphenylamine), TPBi(1,3,5-tri(N-phenylbenzimidazol-2-yl)benzene), TBADN(3-tert-butyl-9,10-di(naphthalene-2-yl)anthracene), DSA(distyryl-arene), CDBP(4,4'-bis(9-carbazolyl)-2,2"-dimethyl-biphenyl) and MADN(2-methyl-9,10-bis(naphthalene-2-yl)anthracene).

[0059] The first light-emitting layer EL11 emitting blue light may include a fluorescent material, for example, a spiro-DPVBi type, a spiro-6P type, a DSB (distyryl-benzene) type, a DSA (distyryl-arene) type, a PFO (polyfluorene) type polymer, and a PPV (poly(p-phenylene vinylene) type polymer. As another example, the first light-emitting layer EL11 may include a phosphor material, and the phosphor material includes an organic metal complex, for example, (4,6-F 2 ppy) 2 Irpic (bis[2-(4,6-difluorophenyl)pyrimidine-C 2 ,N](picolinic acid)iridium(III)).

[0060] The first electron transport layer ETL1 may be on the first light emitting layer EL11. In some embodiments, the first electron transport layer ETL1 may include an electron transport material, for example, Alq 3 (Tris(8-hydroxyquinoline)aluminum), TPBi(1,3,5-tris(1-phenyl-1H-benzo[d]imidazol-2-yl)benzene), BCP(2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline), Bphen(4,7-diphenyl-1,10-phenanthroline), TAZ(3-(4-biphenyl)-4-phenyl-5-tert-butylphenyl-1,2,4-triazole), NTAZ(4-(naphthalen-1-yl)-3,5-diphenyl-4H-1,2,4-triazole), t Bu-PBD (2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole), BAlq (bis(2-methyl-8-hydroxyquinoline-N1,O8)-(1,1'-biphenyl-4-hydroxy)aluminum), Bebq 2 (bis(benzoquinoline-10-hydroxy)beryllium), AND (9,10-di(naphthalene-2-yl)anthracene) or a mixture thereof.

[0061] In some embodiments, an electron injection layer (not shown) may be further provided between the first electron transport layer ETL1 and the common electrode CE. The electron injection layer may include an electron injection material, for example, a material such as LiF, Liq (8-hydroxyquinoline lithium), Li 2 O, BaO, NaCl, CsF or Yb, or a metal halide, for example, RbCl or RbI. For example, in another embodiment, the electron injection layer may include a mixture of an electron transport material and an insulating organic metal salt, and the insulating organic metal salt may be a material having an energy band gap of about 4 eV or more. The insulating organic metal salt may include a metal acetate, a metal benzoate, a metal acetoacetate, a metal acetylacetonate or a metal stearate.

[0062] The first organic layer OL1 having the aforementioned structure may include only one light emitting layer, for example, the first light emitting layer EL11. The first light emitting layer EL11 may be a blue light emitting layer. Therefore, the first light L1 emitted by the first organic layer OL1 may be blue light.

[0063] However, the lamination structure of the first organic layer OL1 is not limited thereto. The lamination structure of the first organic layer OL1 may be modified as follows. Figure 6 and Figure 7 as shown in .

[0064] For example, Figure 6 As shown in FIG. 1 , the first organic layer OL1a may further include a first charge generation layer CGL11 on the first light emitting layer EL11 and a second light emitting layer EL12 on the first charge generation layer CGL11. The first electron transport layer ETL1 may be on the second light emitting layer EL12.

[0065] The first charge generation layer CGL11 may be used to inject charges into each light emitting layer. The first charge generation layer CGL11 may control the charge balance between the first light emitting layer EL11 and the second light emitting layer EL12. In some embodiments, the first charge generation layer CGL11 may include an n-type charge generation layer and a p-type charge generation layer. The p-type charge generation layer may be on the n-type charge generation layer.

[0066] The first charge generation layer CGL11 may have a structure in which an n-type charge generation layer and a p-type charge generation layer are attached to each other. The n-type charge generation layer may be closer to the first pixel electrode AE1 than the common electrode CE. The p-type charge generation layer may be closer to the common electrode CE than the first pixel electrode AE1. The n-type charge generation layer may supply electrons to the first light emitting layer EL11 adjacent to the first pixel electrode AE1, and the p-type charge generation layer may supply holes to the second light emitting layer EL12. The first charge generation layer CGL11 may be between the first light emitting layer EL11 and the second light emitting layer EL12 to provide charges to the respective light emitting layers, thereby improving light emitting efficiency and reducing a driving voltage.

[0067] Similar to the first light-emitting layer EL11, the second light-emitting layer EL12 may emit blue light. In some embodiments, the blue light emitted by the second light-emitting layer EL12 may have the same peak wavelength range as the blue light emitted by the first light-emitting layer EL11. In some embodiments, the second light-emitting layer EL12 may be made of the same material as the first light-emitting layer EL11, or may include at least one selected from the aforementioned materials included in the first light-emitting layer EL11. In some other embodiments, the first light-emitting layer EL11 and the second light-emitting layer EL12 may be made of different materials from each other, and the blue light emitted by the second light-emitting layer EL12 may have a peak wavelength range different from that of the blue light emitted by the first light-emitting layer EL11.

[0068] The first organic layer OL1a having the aforementioned structure may include two light emitting layers, for example, a first light emitting layer EL11 and a second light emitting layer EL12 as light emitting layers. The first light emitting layer EL11 and the second light emitting layer EL12 may be blue light emitting layers. Therefore, the first light L1 emitted by the first organic layer OL1a may be blue light, and the light emitting efficiency and life of the first organic layer OL1a may be improved compared to the light emitting efficiency and life of the first organic layer OL1 including only one light emitting layer.

[0069] Alternatively, if Figure 7 As shown in , the first organic layer OL1b may further include a first charge generation layer CGL11 on the first light-emitting layer EL11, a second light-emitting layer EL12 on the first charge generation layer CGL11, a second charge generation layer CGL12 on the second light-emitting layer EL12, and a third light-emitting layer EL13 on the second charge generation layer CGL12. The first electron transport layer ETL1 may be on the third light-emitting layer EL13. In some embodiments, the second light-emitting layer EL12 may be as described above with reference to Figure 6 The blue light-emitting layer described.

[0070] The second charge generation layer CGL12 may have a structure substantially the same as the aforementioned first charge generation layer CGL11. For example, the second charge generation layer CGL12 may include: an n-type charge generation layer, which is closer to the first pixel electrode AE1 than the common electrode CE; and a p-type charge generation layer, which is closer to the common electrode CE than the first electrode AE1. In some embodiments, the second charge generation layer CGL12 may have a structure in which the n-type charge generation layer and the p-type charge generation layer are attached to each other. The first charge generation layer CGL11 and the second charge generation layer CGL12 may be made of different materials, or may be made of the same material. The second charge generation layer CGL12 may supply electrons to the second light-emitting layer EL12, and may supply holes to the third light-emitting layer EL13.

[0071] The third light-emitting layer EL13 may emit light of a color different from the color of the light emitted by the first light-emitting layer EL11 and the second light-emitting layer EL12. In some embodiments, the third light-emitting layer EL13 may emit light of a second color, for example, green light, as indicated by two sub-lights L11 (blue) and L12 (green). In some embodiments, the green light emitted by the third light-emitting layer EL13 may have a peak wavelength in the range of 510nm to 550nm. That is, in some embodiments, the third light-emitting layer EL13 may be a green light-emitting layer. In some embodiments, the third light-emitting layer EL13 may include a host and a dopant. The host included in the third light-emitting layer EL13 may be any one of the examples of the host listed in the description of the first light-emitting layer EL11. Examples of the host included in the third light-emitting layer EL13 may include a fluorescent material, for example, Alq. 3 (tris(8-hydroxyquinoline)aluminum); and phosphor materials, such as Ir(ppy) 3 (facial-tris(2-phenylpyridine)iridium), Ir(ppy) 2 (acac)(bis(2-phenylpyridine)(acetylacetonate)iridium(III)) and Ir(mpyp) 3 (2-phenyl-4-methyl-pyridine iridium).

[0072] However, the lamination order of the first light-emitting layer EL11 for emitting blue light, the second light-emitting layer EL12 for emitting blue light, and the third light-emitting layer EL13 for emitting green light may be varied differently. Illustratively, the third light-emitting layer EL13 may be between the first hole transport layer HTL1 and the first charge generation layer CGL11, the first light-emitting layer EL11 may be between the first charge generation layer CGL11 and the second charge generation layer CGL12, and the second light-emitting layer EL12 may be between the second charge generation layer CGL12 and the first electron transport layer ETL1. Alternatively, the first light-emitting layer EL11 may be between the first hole transport layer HTL1 and the first charge generation layer CGL11, the third light-emitting layer EL13 may be between the first charge generation layer CGL11 and the second charge generation layer CGL12, and the second light-emitting layer EL12 may be between the second charge generation layer CGL12 and the first electron transport layer ETL1.

[0073] The first organic layer OL1b having the aforementioned structure may include three light-emitting layers, for example, a first light-emitting layer EL11, a second light-emitting layer EL12, and a third light-emitting layer EL13 as light-emitting layers. In addition, the first light-emitting layer EL11 and the second light-emitting layer EL12 may be blue light-emitting layers, and the third light-emitting layer EL13 may be a green light-emitting layer. Therefore, the first organic layer OL1b may emit blue light as the first light L1, and green light as the sub-light L12.

[0074] However, similar to the first and second light emitting layers EL11 and EL12, the third light emitting layer EL13 may emit blue light. That is, the third light emitting layer EL13 may be a blue light emitting layer. In this case, the first organic layer OL1b may not emit green light as the sub-light L12, but may only emit blue light as the first light L1.

[0075] In some embodiments, Figure 5 The first organic layer OL1 shown in Figure 6 The first organic layer OL1a and Figure 7 The first organic layer OL1b shown in FIG. 4 may not include a red light emitting layer and thus may not emit red light.

[0076] like Figure 8 As shown in , the second organic layer OL2 may include a second hole transport layer HTL2 on the second pixel electrode AE2, a fourth light emitting layer EL21 on the second hole transport layer HTL2, a third charge generation layer CGL21 on the fourth light emitting layer EL21, a fifth light emitting layer EL22 on the third charge generation layer CGL21, and a second electron transport layer ETL2 on the third charge generation layer CGL21. The common electrode CE may be on the second electron transport layer ETL2.

[0077] The second hole transport layer HTL2 may have substantially the same structure and substantially the same material as the aforementioned first hole transport layer HTL1. In some embodiments, the second hole transport layer HTL2 may be separated from the first hole transport layer HTL1 without being connected to the first hole transport layer HTL1. In other embodiments, the second hole transport layer HTL2 and the first hole transport layer HTL1 may be connected to each other or may be integrated with each other.

[0078] The fourth light-emitting layer EL21 may be on the second hole transport layer HTL2. Similar to the first light-emitting layer EL11, the fourth light-emitting layer EL21 may emit light of a third color, for example, blue light. The blue light emitted by the fourth light-emitting layer EL21 may have the same peak wavelength range as the blue light emitted by the first light-emitting layer EL11. In some embodiments, the fourth light-emitting layer EL21 may be made of the same material as the first light-emitting layer EL11, or may include at least one selected from the foregoing materials included in the first light-emitting layer EL11.

[0079] The third charge generation layer CGL21 may have substantially the same structure as the aforementioned first charge generation layer CGL11. The third charge generation layer CGL21 may supply electrons to the fourth light emitting layer EL21, and may supply holes to the fifth light emitting layer EL22.

[0080] The fifth light-emitting layer EL22 may emit light of a second color, for example, green light. In some embodiments, the peak wavelength of the green light emitted by the fifth light-emitting layer EL22 may be in the range of 510 nm to 550 nm. In some embodiments, the fifth light-emitting layer EL22 may include the materials listed in the description of the case where the third light-emitting layer EL13 is a green light-emitting layer. In some embodiments, when the third light-emitting layer EL13 of the first organic layer OL1b is a green light-emitting layer, the fifth light-emitting layer EL22 may be made of the same material as the third light-emitting layer EL13.

[0081] The second electron transport layer ETL2 may have substantially the same structure and substantially the same material as the aforementioned first electron transport layer ETL1. In some embodiments, as shown in the figure, the second electron transport layer ETL2 may be separated from the first electron transport layer ETL1 without being connected to the first electron transport layer ETL1. In other embodiments, the second electron transport layer ETL2 and the first electron transport layer ETL1 may be connected to each other or may be integrated with each other.

[0082] The lamination order of the fourth light emitting layer EL21 for emitting blue light and the fifth light emitting layer EL22 for emitting green light may be varied variously. For example, the fifth light emitting layer EL22 may be between the second hole transport layer HTL2 and the third charge generation layer CGL21, and the fourth light emitting layer EL21 may be between the third charge generation layer CGL21 and the second electron transport layer ETL2.

[0083] The second organic layer OL2 having the aforementioned structure may include two light-emitting layers, for example, a fourth light-emitting layer EL21 and a fifth light-emitting layer EL22. In addition, the fourth light-emitting layer EL21 may be a blue light-emitting layer, and the fifth light-emitting layer EL22 may be a green light-emitting layer. Therefore, the second light L2 emitted by the second organic layer OL2 may include a first sub-light L21 as blue light and a second sub-light L22 as green light. Since the second organic layer OL2 emits green light as well as blue light, the total amount of green light emitted in the second light-emitting area PA2 to the outside of the display device 1 may be increased.

[0084] However, the lamination structure of the second organic layer OL2 is not limited thereto and may be modified as follows. Fig. 9 Reference Fig. 9 Unlike the second organic layer OL2, the second organic layer OL2a may further include a fourth charge generation layer CGL22 on the fifth light emitting layer EL22 and a sixth light emitting layer EL23 on the fourth charge generation layer CGL22. The second electron transport layer ETL2 may be on the sixth light emitting layer EL23.

[0085] In some embodiments, similar to the first light-emitting layer EL11, the sixth light-emitting layer EL23 may emit light of a third color, for example, blue light. That is, the sixth light-emitting layer EL23 may be a blue light-emitting layer. The sixth light-emitting layer EL23 may be made of the same material as the first light-emitting layer EL11, or may include at least one selected from the foregoing materials included in the first light-emitting layer EL11.

[0086] The lamination order of the fourth light-emitting layer EL21 for emitting blue light, the fifth light-emitting layer EL22 for emitting green light, and the sixth light-emitting layer EL23 for emitting blue light may be varied differently. For example, the fourth light-emitting layer EL21 may be between the second hole transport layer HTL2 and the third charge generation layer CGL21, the sixth light-emitting layer EL23 may be between the third charge generation layer CGL21 and the fourth charge generation layer CGL22, and the fifth light-emitting layer EL22 may be between the fourth charge generation layer CGL22 and the second electron transport layer ETL2. Alternatively, the fifth light-emitting layer EL22 may be between the second hole transport layer HTL2 and the third charge generation layer CGL21, the fourth light-emitting layer EL21 may be between the third charge generation layer CGL21 and the fourth charge generation layer CGL22, and the sixth light-emitting layer EL23 may be between the fourth charge generation layer CGL22 and the second electron transport layer ETL2.

[0087] Since the second organic layer OL2a having the aforementioned structure further includes a light-emitting layer emitting blue light, for example, a sixth light-emitting layer EL23, Figure 8 Compared with the second organic layer OL2 shown in FIG. 8 , it is possible to further increase the amount of the first sub-light L21 , ie, blue light, emitted by the second organic layer OL2 a.

[0088] In some embodiments, Figure 8 The second organic layer OL2 shown in Fig. 9 The second organic layer OL2a shown in FIG. 4 may not include a red light emitting layer and thus may not emit red light.

[0089] like Fig.10 As shown in FIG. 1 , the third organic layer OL3 may include a third hole transport layer HTL3 on the third pixel electrode AE3, a seventh light emitting layer EL31 on the third hole transport layer HTL3, and a third electron transport layer ETL3 on the seventh light emitting layer EL31. In some embodiments, the third organic layer OL3 may have substantially the same structure as the first organic layer OL1.

[0090] The third hole transport layer HTL3 may be made of the same material as the first hole transport layer HTL1 and may have the same structure as the first hole transport layer HTL1. The third hole transport layer HTL3 is shown as being separated from the first hole transport layer HTL1 and the second hole transport layer HTL2. Alternatively, the first hole transport layer HTL1, the second hole transport layer HTL2, and the third hole transport layer HTL3 may be connected or integrated with each other.

[0091] The seventh light-emitting layer EL31 may emit light of the same color as the first light-emitting layer EL11. For example, similar to the first light-emitting layer EL11, the seventh light-emitting layer EL31 may be a blue light-emitting layer that emits blue light. The seventh light-emitting layer EL31 may be made of the same material as the first light-emitting layer EL11, or may include the materials mentioned as examples of the constituent materials of the first light-emitting layer EL11.

[0092] The third electron transport layer ETL3 may have substantially the same structure and substantially the same material as the aforementioned first electron transport layer ETL1. In some embodiments, as shown in the figure, the third electron transport layer ETL3 may be separated from the first electron transport layer ETL1 and the second electron transport layer ETL2 without being connected to the first electron transport layer ETL1 and the second electron transport layer ETL2. In another embodiment, the first electron transport layer ETL1, the second electron transport layer ETL2, and the third electron transport layer ETL3 may be connected to each other or may be integrated with each other.

[0093] The third organic layer OL3 having the aforementioned structure may include only the seventh light emitting layer EL31 as a light emitting layer, and the seventh light emitting layer EL31 may be a blue light emitting layer. Therefore, the third light L3 emitted by the third organic layer OL3 may be blue light.

[0094] However, the laminated structure of the third organic layer OL3 may be variously modified as follows. Fig.11 and Fig.12 as shown in .

[0095] For example, Fig.11 As shown in , the third organic layer OL3a may further include a fifth charge generation layer CGL31 on the seventh light emitting layer EL31 and an eighth light emitting layer EL32 on the fifth charge generation layer CGL31. The third electron transport layer ETL3 may be on the eighth light emitting layer EL32.

[0096] The fifth charge generation layer CGL31 may have substantially the same structure as the aforementioned first charge generation layer CGL11. The fifth charge generation layer CGL31 may supply electrons to the seventh light emitting layer EL31, and may supply holes to the eighth light emitting layer EL32.

[0097] Similar to the seventh light-emitting layer EL31, the eighth light-emitting layer EL32 may emit blue light. That is, in some embodiments, the eighth light-emitting layer EL32 may be a blue light-emitting layer. In some embodiments, the eighth light-emitting layer EL32 may be made of the same material as the first light-emitting layer EL11, or may include a material selected from the aforementioned constituent materials of the first light-emitting layer EL11.

[0098] The third organic layer OL3a having the aforementioned structure may include two blue light emitting layers, for example, the seventh light emitting layer EL31 and the eighth light emitting layer EL32 as the light emitting layers. Therefore, the third light L3 emitted by the third organic layer OL3a may be blue light, and the light emitting efficiency and life of the third organic layer OL3a may be improved compared with the light emitting efficiency and life of the third organic layer OL3 including only one light emitting layer.

[0099] Alternatively, if Fig.12 As shown in Fig.11 Compared with the third organic layer OL3a shown in FIG. 3 , the third organic layer OL3b may further include a sixth charge generation layer CGL32 on the eighth light emitting layer EL32 and a ninth light emitting layer EL33 on the sixth charge generation layer CGL32. The third electron transport layer ETL3 may be on the ninth light emitting layer EL33.

[0100] The sixth charge generation layer CGL32 may have substantially the same structure as the aforementioned first charge generation layer CGL11. The sixth charge generation layer CGL32 may supply electrons to the eighth light emitting layer EL32, and may supply holes to the ninth light emitting layer EL33.

[0101] Similar to the third light emitting layer EL13, in some embodiments, the ninth light emitting layer EL33 may be a green light emitting layer. When the ninth light emitting layer EL33 is a green light emitting layer, the third organic layer OL3b may emit green light as the sub-light L32 and the third light L3 which is blue light.

[0102] When the ninth light-emitting layer EL33 is a green light-emitting layer, the position of the ninth light-emitting layer EL33 may vary differently. For example, the ninth light-emitting layer EL33 may be between the third hole transport layer HTL3 and the fifth charge generation layer CGL31, the seventh light-emitting layer EL31 may be between the fifth charge generation layer CGL31 and the sixth charge generation layer CGL32, and the eighth light-emitting layer EL32 may be between the sixth charge generation layer CGL32 and the third electron transport layer ETL3. Alternatively, the ninth light-emitting layer EL33 may be between the fifth charge generation layer CGL31 and the sixth charge generation layer CGL32, the seventh light-emitting layer EL31 may be between the third hole transport layer HTL3 and the fifth charge generation layer CGL31, and the eighth light-emitting layer EL32 may be between the sixth charge generation layer CGL32 and the third electron transport layer ETL3. However, the ninth light-emitting layer EL33 may be a blue light-emitting layer.

[0103] In some embodiments, Fig.10 The third organic layer OL3 shown in FIG. Fig.11 The third organic layer OL3a and Fig.12 The third organic layer OL3 b shown in FIG. 5 may not include a red light emitting layer and thus may not emit red light.

[0104] Return to reference Figure 4 , the thin film encapsulation layer 170 may be on the common electrode CE. The thin film encapsulation layer 170 may be on the first light emitting area PA1, the second light emitting area PA2, the third light emitting area PA3, and the non-light emitting area PB collectively. In some embodiments, the thin film encapsulation layer 170 directly covers the common electrode CE. In some embodiments, a capping layer (not shown) covering the common electrode CE may be further between the thin film encapsulation layer 170 and the common electrode CE. In this case, the thin film encapsulation layer 170 may directly cover the capping layer.

[0105] In some embodiments, the thin film encapsulation layer 170 may include a first encapsulation inorganic film 171, an encapsulation organic film 173, and a second encapsulation inorganic film 175 sequentially laminated on the common electrode CE. In some embodiments, each of the first encapsulation inorganic film 171 and the second encapsulation inorganic film 175 may be made of silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, silicon oxynitride (SiON), lithium fluoride, etc. In some embodiments, the encapsulation organic film 173 may be made of acrylic resin, methacrylic resin, polyisoprene, vinyl resin, epoxy resin, urethane resin, cellulose resin, perylene resin, etc. The laminated structure of the thin film encapsulation layer 170 may be variously changed.

[0106] The second substrate 30 will be described below. The second base portion 310 may be made of a material having light transmittance. In some embodiments, the second base portion 310 may be a glass substrate or a plastic substrate.

[0107] The light blocking member 320 may be on one surface of the second base portion 310 facing the first substrate 10. The light blocking member 320 may be in the non-light emitting area PB and may block the transmission of light. For example, the light blocking member 320 may form a lattice in a plan view and may prevent color mixing caused by light entering between adjacent light emitting areas.

[0108] The first color filter 331 may be on one surface of the second base portion 310 in the first light emitting area PA1, the second color filter 333 may be on one surface of the second base portion 310 in the second light emitting area PA2, and the third color filter 335 may be on one surface of the second base portion 310 in the third light emitting area PA3.

[0109] The first color filter 331 may block or absorb light of a third color, for example, blue light. That is, the first color filter 331 may be used as a blue light blocking filter for blocking blue light. In some embodiments, the first color filter 331 may selectively transmit light of a first color, for example, red light, and may block or absorb light of a second color, for example, green light. Illustratively, the first color filter 331 may be a red color filter and may include a red colorant.

[0110] The second color filter 333 may block or absorb light of a third color, for example, blue light. That is, the second color filter 333 may be used as a blue light blocking filter for blocking blue light. In some embodiments, the second color filter 333 may selectively transmit light of a second color, for example, green light, and may block or absorb light of a first color, for example, red light. Illustratively, the second color filter 333 may be a green color filter and may include a green colorant.

[0111] The third color filter 335 can selectively transmit light of a third color, for example, blue light, and can block or absorb light of a first color, for example, red light, and light of a second color, for example, green light. In some embodiments, the third color filter 335 can be a blue color filter and can include a blue colorant.

[0112] In some embodiments, a boundary portion between the first color filter 331 and the second color filter 333, and a boundary portion between the second color filter 333 and the third color filter 335 may be in the non-light emitting region PB. The light blocking member 320 may be between the second base portion 310 and a boundary portion of the first color filter 331 and the second color filter 333, and between the second base portion 310 and a boundary portion of the second color filter 333 and the third color filter 335.

[0113] The first capping layer 351 may be on the first color filter 331, the second color filter 333, and the third color filter 335. The first capping layer 351 may prevent damage or contamination of the first color filter 331, the second color filter 333, and the third color filter 335 due to penetration of impurities from the outside, such as moisture and air. In addition, the first capping layer 351 may prevent the colorant included in the first color filter 331, the second color filter 333, and the third color filter 335 from diffusing into another component, for example, the first low refractive index layer 391. In some embodiments, the first capping layer 351 may be made of an inorganic material, for example, silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, silicon oxynitride, and the like.

[0114] In some embodiments, the first low refractive index layer 391 may be on the first capping layer 351. The first low refractive index layer 391 may be above the first light emitting area PA1, the second light emitting area PA2, the third light emitting area PA3, and the non-light emitting area PB. In some embodiments, the first low refractive index layer 391 may have a lower refractive index than the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343. For example, the first low refractive index layer 391 may have a refractive index of about 1.1 to about 1.4. In some embodiments, the refractive index of each of the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343 may be greater than the refractive index of the first low refractive index layer 391 by 0.3 or more. In addition, in some embodiments, the refractive index of the light-transmitting pattern 345 may also be greater than the refractive index of the first low refractive index layer 391 by 0.3 or more.

[0115] In some embodiments, the first low refractive index layer 391 may reflect a portion of light emitted in a direction from the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343 to the second base portion 310 again toward the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343. That is, since the first low refractive index layer 391 recycles at least a portion of light transmitted through the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343 toward the second base portion 310, light utilization efficiency may be improved, and thus light efficiency of the display device 1 may be improved.

[0116] In some embodiments, the first low refractive index layer 391 may include a base resin and particles dispersed in the base resin. In some embodiments, the particles included in the first low refractive index layer 391 may be, for example, zinc oxide (ZnO) particles, titanium dioxide (TiO 2 ) particles, hollow silica particles in which voids are provided, silica particles in which voids are not provided, nano silicate particles and pore-forming agent particles. In some embodiments, when the particles are hollow particles each having a hollow structure, i.e., a shell, the diameter of each particle may be 20nm to 200nm, and the thickness of the shell may be 5nm to 20nm. The diameter of the hollow may be determined based on the thickness of the shell and the diameter of the particle. The refractive index of the first low refractive index layer 391 may be controlled by controlling the thickness of the shell and the diameter of the particle.

[0117] The second capping layer 353 may be on the first low refractive index layer 391. The second capping layer 353 may cover the first low refractive index layer 391. The second capping layer 353 may prevent the first low refractive index layer 391 from being damaged or contaminated by impurities from the outside, such as the penetration of moisture and air. In addition, the second capping layer 353 may prevent the particles included in the first low refractive index layer 391 from diffusing into another component. In addition, the second capping layer 353 may encapsulate the first wavelength conversion pattern 341, the second wavelength conversion pattern 343 and the light-transmitting pattern 345 together with the third capping layer 355 to be described later to prevent external air and moisture from penetrating into the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343. In some embodiments, the second capping layer 353 may be made of an inorganic material. In some embodiments, the second capping layer 353 may include the same material as the first capping layer 351, or may include at least one of the materials listed in the description of the first capping layer 351.

[0118] In the first light emitting area PA1, the first wavelength conversion pattern 341 may be on the second capping layer 353. The first wavelength conversion pattern 341 may be in the first light emitting area PA1, and may not be in the second light emitting area PA2 and the third light emitting area PA3. The first wavelength conversion pattern 341 may convert or transform incident light of a specific peak wavelength into light of another specific peak wavelength and emit the light. In some embodiments, the first wavelength conversion pattern 341 may convert the first light L1 provided as blue light from the first organic light emitting element ED1 into red light having a wavelength range of 610 nm to 650 nm, and emit the red light.

[0119] In some embodiments, the first wavelength conversion pattern 341 may include a first base resin 3411 and first wavelength converters 3413 dispersed in the first base resin 3411 , and may further include first scatterers 3415 dispersed in the first base resin 3411 .

[0120] The first base resin 3411 is not particularly limited as long as it has high light transmittance and excellent dispersion characteristics for the first wavelength converter 3413 and the first scatterer 3415. For example, the first base resin 3411 may include an organic material, such as epoxy resin, acrylic resin, cardo resin, imide resin, etc. In some embodiments, the refractive index of the first base resin 3411 may be greater than the refractive index of the first low refractive index layer 391 by 0.3 or more.

[0121] The first wavelength converter 3413 may convert or transform the peak wavelength of the incident light into another specific peak wavelength. Examples of the first wavelength converter 3413 may include quantum dots, quantum rods, and phosphors. For example, quantum dots may be particulate matter that emits a specific color when electrons move from the conduction band to the valence band.

[0122] Quantum dots can be semiconductor nanocrystal materials. Quantum dots have specific band gaps depending on their composition and size, and therefore can absorb light and then emit light with an inherent wavelength. Examples of semiconductor nanocrystals of quantum dots include Group IV nanocrystals, Group II-VI compound nanocrystals, Group III-V compound nanocrystals, Group IV-VI nanocrystals, and combinations thereof.

[0123] Examples of Group IV nanocrystals may include silicon (Si), germanium (Ge), and the like, and binary compounds such as silicon carbide (SiC), silicon germanium (SiGe), and the like.

[0124] Examples of Group II-VI compound nanocrystals may include two-element compounds, such as CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS, and mixtures thereof; three-element compounds, such as CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe , CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS and mixtures thereof; and four-element compounds, for example, HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe and mixtures thereof.

[0125] Examples of Group III-V compound nanocrystals may include binary compounds, e.g., GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, and mixtures thereof; ternary compounds, e.g., GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InGaP, InPSb, and mixtures thereof; and quaternary compounds, e.g., GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, GaAlNP, and mixtures thereof.

[0126] Examples of Group IV-VI nanocrystals may include binary compounds, e.g., SnS, SnSe, SnTe, PbS, PbSe, PbTe, and mixtures thereof; ternary compounds, e.g., SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, and mixtures thereof; and quaternary compounds, e.g., SnPbSSe, SnPbSeTe, SnPbSTe, and mixtures thereof.

[0127] In some embodiments, the quantum dot may have a core-shell structure including a core and a shell surrounding the core, the core including the aforementioned nanocrystal. The shell of the quantum dot may prevent the chemical denaturation of the core, thereby serving as a protective layer for maintaining semiconductor properties and / or a charging layer for imparting electrophoretic properties to the quantum dot. The shell may be a single layer or multiple layers. Examples of the shell of the quantum dot may include metal or non-metal oxides, semiconductor compounds, and combinations thereof.

[0128] Examples of metal or nonmetal oxides may include binary compounds, for example, 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 and NiO; and ternary compounds, such as MgAl 2 O 4 、CoFe 2 O 4 、NiFe 2 O 4 and CoMn 2 O 4 Examples of semiconductor compounds may include CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnSeS, ZnTeS, GaAs, GaP, GaSb, HgS, HgSe, HgTe, InAs, InP, InSb, AlAs, AlP, and AlSb.

[0129] The light emitted by the first wavelength converter 3413 may have a light emission wavelength spectrum half bandwidth of about 45 nm or less, or about 40 nm or less, or about 30 nm or less. Therefore, the color purity and color reproducibility of the color displayed by the display device 1 can be further improved. In addition, regardless of the incident direction of the incident light, the light emitted by the first wavelength converter 3413 can be emitted in all directions.

[0130] In some embodiments, the first wavelength converter 3413 may convert the first light L1 provided from the first organic light emitting element ED1, for example, blue light, into red light having a single peak wavelength in a range of about 610 nm to about 650 nm, and then emit the red light. A portion of the first light L1 provided from the first organic light emitting element ED1 may not be converted into red light by the first wavelength converter 3413, but may be transmitted through the first wavelength conversion pattern 341 and emitted to the outside. A portion of the first light L1 incident on the first color filter 331 without being converted by the first wavelength conversion pattern 341 may be blocked by the first color filter 331. On the other hand, the red light into which the first light L1 is converted by the first wavelength conversion pattern 341 is transmitted through the first color filter 331 and emitted to the outside. Therefore, the first exit light La emitted from the first light emitting area PA1 to the outside of the display device 1 may be red light.

[0131] In some embodiments, a portion of the first light L1 that is not converted by the first wavelength conversion pattern 341 and transmits through the first color filter 331 may be reflected by the first low refractive index layer 391 and incident on the first wavelength conversion pattern 341 again, thereby improving light conversion efficiency as described above.

[0132] In some embodiments, the sub-light L12, for example, green light, and the first light L1, for example, blue light, may be provided from the first organic light emitting element ED1 to the first wavelength conversion pattern 341. In this case, a portion of the sub-light L12, which is green light, may be wavelength-converted by the first wavelength conversion pattern 341, or may be transmitted through the first wavelength conversion pattern 341 without being wavelength-converted by the first wavelength conversion pattern 341. The first color filter 331 may block a portion of the sub-light L12 that is not wavelength-converted by the first wavelength conversion pattern 341. Thus, the first exit light La, for example, red light, may be emitted.

[0133] The first scatterer 3415 has a refractive index different from that of the first base resin 3411 and may form an optical interface with the first base resin 3411. For example, the first scatterer 3415 may be light scattering particles. The first scatterer 3415 may be any material capable of scattering at least a portion of the transmitted light, for example, metal oxide particles or organic particles. Examples of metal oxides may include titanium oxide (TiO 2 ), zirconium oxide (ZrO 2 ), aluminum oxide (Al2 O 3 ), indium oxide (In 2 O 3 ) and zinc oxide (ZnO). Examples of the material of the organic particles may include acrylic resin and urethane resin.

[0134] Regardless of the incident direction of the incident light, the first scatterer 3415 may scatter the light in random directions without substantially changing the wavelength of the light transmitted through the first wavelength conversion pattern 341. Therefore, the path length of the light passing through the first wavelength conversion pattern 341 may be increased, and the color conversion efficiency through the first wavelength converter 3413 may be increased.

[0135] In some embodiments, the thickness of the first wavelength conversion pattern 341 may be 3 μm to 15 μm. When the first wavelength conversion pattern 341 is formed to have a thickness of 3 μm or more, the color conversion efficiency of light transmitted through the first wavelength conversion pattern 341 may be improved. In some embodiments, from the perspective of ease of processing, the upper limit of the thickness of the first wavelength conversion pattern 341 may be about 15 μm.

[0136] In some embodiments, the content of the first wavelength converter 3413 included in the first wavelength conversion pattern 341 may be 10% to 60%. In addition, the content of the first scatterer 3415 included in the first wavelength conversion pattern 341 may be 2% to 10%.

[0137] In the second light emitting area PA2, the second wavelength conversion pattern 343 may be on the second capping layer 353. The second wavelength conversion pattern 343 may be in the second light emitting area PA2, and may not be in the first light emitting area PA1 and the third light emitting area PA3. The second wavelength conversion pattern 343 may convert or transform incident light of a specific peak wavelength into light of another specific peak wavelength and emit the light. In some embodiments, the second wavelength conversion pattern 343 may convert the first sub-light L21 of the second light L2 provided from the second organic light emitting element ED2, for example, blue light, into green light having a wavelength range of about 510 nm to about 550 nm and emit green light.

[0138] In some embodiments, the second wavelength conversion pattern 343 may include a second base resin 3431 and a second wavelength converter 3433 dispersed in the second base resin 3431 , and may further include a second scatterer 3435 dispersed in the second base resin 3431 .

[0139] The second base resin 3431 may be made of a material having high light transmittance. In some embodiments, the second base resin 3431 may be made of an organic material. In some embodiments, the second base resin 3431 may be made of the same material as the first base resin 3411, or may include at least one of the materials listed as the constituent materials of the first base resin 3411. In some embodiments, the refractive index of the second base resin 3431 may be greater than the refractive index of the first low refractive index layer 391 by 0.3 or more.

[0140] The second wavelength converter 3433 may convert or transform the peak wavelength of the incident light into another specific peak wavelength. In some embodiments, the second wavelength converter 3433 may convert blue light having a peak wavelength in the range of 430nm to 470nm into green light having a peak wavelength in the range of 510nm to 550nm.

[0141] Examples of the second wavelength converter 3433 may include quantum dots, quantum rods, and phosphors. Since a more detailed description of the second wavelength converter 3433 is substantially the same as or similar to that described in the above description of the first wavelength converter 3413, a more detailed description thereof will be omitted.

[0142] In some embodiments, both the first wavelength converter 3413 and the second wavelength converter 3433 may be made of quantum dots. In this case, the diameter of each quantum dot constituting the first wavelength converter 3413 may be greater than the diameter of each quantum dot constituting the second wavelength converter 3433.

[0143] The second scatterer 3435 has a refractive index different from that of the second base resin 3431 and may form an optical interface with the second base resin 3431. For example, the second scatterer 3435 may be light scattering particles. Since the detailed description of the second scatterer 3435 is substantially the same as or similar to that of the first scatterer 3415, the detailed description thereof will be omitted.

[0144] In some embodiments, the thickness of the second wavelength conversion pattern 343 may be 3 μm to 15 μm. When the second wavelength conversion pattern 343 is formed to have a thickness of 3 μm or more, the color conversion efficiency of light transmitted through the second wavelength conversion pattern 343 may be improved. In some embodiments, from the perspective of ease of processing, the upper limit of the thickness of the second wavelength conversion pattern 343 may be about 15 μm.

[0145] In some embodiments, the content of the second wavelength converter 3433 included in the second wavelength conversion pattern 343 may be 10% to 60%. In addition, the content of the second scatterer 3435 included in the second wavelength conversion pattern 343 may be 2% to 10%.

[0146] The first sub-light L21 and the second sub-light L22 emitted from the second organic light-emitting element ED2 may be provided to the second wavelength conversion pattern 343, and the second wavelength converter 3433 may convert the first sub-light L21 of the second light L2 provided from the second organic light-emitting element ED2, for example, blue light, into green light having a peak wavelength in the range of about 510 nm to about 550 nm and emit green light.

[0147] A portion of the first sub-light L21, for example, blue light, may not be converted into green light by the second wavelength converter 3433, but may be transmitted through the first wavelength conversion pattern 341 and emitted to the outside, and may be blocked by the second color filter 333. On the other hand, the first sub-light L21 is converted into green light by the second wavelength conversion pattern 343, is transmitted through the second color filter 333 and emitted to the outside. Therefore, the second emission light Lb emitted from the second light emitting area PA2 to the outside of the display device 1 may be green light.

[0148] Meanwhile, the second sub-light L22 of the second light L2 of the second organic light emitting element ED2, for example, green light is not wavelength-converted by the second wavelength converter 3433 but is transmitted through the second wavelength conversion pattern 343 and the second color filter 333 and emitted to the outside.

[0149] In some embodiments, the light conversion efficiency of the second wavelength conversion pattern 343 for converting blue light into green light may be lower than the light conversion efficiency of the first wavelength conversion pattern 341 for converting blue light into red light. Therefore, even when the same amount of blue light is provided to the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343, the light amount of the second exit light Lb emitted from the second light emitting area PA2 may be less than the light amount of the first exit light La emitted from the first light emitting area PA1. Therefore, the color reproducibility of the display device may be deteriorated.

[0150] According to some embodiments, the second organic light emitting element ED2 emits green light as well as blue light, and the second sub-light L22 as green light emitted from the second organic light emitting element ED2 is emitted to the outside of the second light emitting area PA2 together with the second exit light Lb as green light converted by the second wavelength conversion pattern 343. That is, a relatively small amount of green light may be supplemented by the second sub-light L22 as green light emitted from the second organic light emitting element ED2. Therefore, the color reproducibility of the display device 1 may be improved.

[0151] In some embodiments, a portion of the first sub-light L21 that is not converted by the second wavelength conversion pattern 343 but passes through the second wavelength conversion pattern 343 may be reflected by the first low refractive index layer 391 and incident on the second wavelength conversion pattern 343 again, thereby improving the light conversion efficiency as described above.

[0152] In the third light emitting area PA3, the light-transmitting pattern 345 may be on the second capping layer 353. The light-transmitting pattern 345 may be in the third light emitting area PA3, and may not be in the first and second light emitting areas PA1 and PA2. The light-transmitting pattern 345 may transmit incident light.

[0153] In some embodiments, the light-transmitting pattern 345 may include a third base resin 3451 and a third scatterer 3455 dispersed in the third base resin 3451 .

[0154] The third base resin 3451 may be made of a material having high light transmittance. In some embodiments, the third base resin 3451 may be made of an organic material. In some embodiments, the third base resin 3451 may be made of the same material as the first base resin 3411, or may include at least one of the materials listed as the constituent materials of the first base resin 3411. In some embodiments, the refractive index of the third base resin 3451 may be greater than the refractive index of the first low refractive index layer 391 by 0.3 or more.

[0155] The third scatterer 3455 has a refractive index different from that of the third base resin 3451 and may form an optical interface with the third base resin 3451. For example, the third scatterer 3455 may be light scattering particles. Since the detailed description of the third scatterer 3455 is substantially the same as or similar to that of the first scatterer 3415, the detailed description thereof will be omitted.

[0156] The third light L3 as blue light provided from the third organic light emitting element ED3 is transmitted through the light-transmitting pattern 345 and the third color filter 335 and emitted to the outside. That is, the third exit light emitted in the third emission area PA3 may be the third light L3 emitted from the third organic light emitting element ED3.

[0157] The third capping layer 355 may be on the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343. The third capping layer 355 may cover the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343. In some embodiments, the third capping layer 355 may be on the light-transmitting pattern 345 and may further cover the light-transmitting pattern 345. The third capping layer 355 may encapsulate the first wavelength conversion pattern 341, the second wavelength conversion pattern 343 and the light-transmitting pattern 345 together with the second capping layer 353. Therefore, damage or contamination of the first wavelength conversion pattern 341, the second wavelength conversion pattern 343 and the light-transmitting pattern 345 caused by the penetration of impurities such as moisture and air from the outside can be reduced or prevented. In some embodiments, the third capping layer 355 may be made of an inorganic material. In some embodiments, the third capping layer 355 may be made of the same material as the first capping layer 351, or may include at least one of the materials listed in the description of the first capping layer 351.

[0158] In some embodiments, a protective layer 370 may be further on the third capping layer 355. The protective layer 370 may cover the third capping layer 355. In some embodiments, the protective layer 370 may be made of an inorganic material, such as silicon oxide, silicon nitride, or silicon oxynitride. In other embodiments, the protective layer 370 may be omitted.

[0159] The second low refractive index layer 393 may be on the protective layer 370. Similar to the first low refractive index layer 391, the second low refractive index layer 393 may be above the first light emitting area PA1, the second light emitting area PA2, the third light emitting area PA3, and the non-light emitting area PB. In some embodiments, the second low refractive index layer 393 may have a lower refractive index than the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343. For example, the second low refractive index layer 393 may have a refractive index of about 1.1 to about 1.4. In some embodiments, the refractive index of each of the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343 may be greater than the refractive index of the second low refractive index layer 393 by 0.3 or more.

[0160] In some embodiments, the second low refractive index layer 393 may reflect a portion of light emitted in a direction from the first and second wavelength conversion patterns 341 and 343 to the first base portion 110 again toward the first and second wavelength conversion patterns 341 and 343. That is, since the second low refractive index layer 393 may again induce and recycle the blue light provided to the first and second wavelength conversion patterns 341 and 343 to be emitted toward the first base portion 110, light utilization efficiency may be improved, and thus light efficiency of the display device 1 may be improved.

[0161] In addition, since the second low refractive index layer 393 can convert the wavelength of the light emitted toward the first base portion 110 by the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343, and reflect it toward the second base portion 310 again, the second low refractive index layer 393 can contribute to image display. Therefore, light utilization efficiency can be improved, and display quality, such as brightness, of the display device 1 can be improved.

[0162] In addition, since the second low refractive index layer 393 may reflect light of the blue light incident on the light-transmitting pattern 345 emitted toward the first base portion 110 again toward the second base portion 310 , light utilization efficiency may be improved.

[0163] As described above, the filler 70 may be in the space between the second substrate 30 and the first substrate 10. In some embodiments, the filler 70 may be between the second low refractive index layer 393 and the thin film encapsulation layer 170.

[0164] Fig.13 It is along Figure 3 A cross-sectional view of a display device according to another embodiment taken along line X3-X3' in FIG. Fig.13 According to the display device 1a of this embodiment, Figure 4 The display device 1 shown in FIG. 1 is the same as or similar to the display device 1 shown in FIG. 1 , except that the configuration of the second substrate 30a of the display device 1a is different from the configuration of the second substrate 30 of the display device 1. Therefore, the differences will be mainly described below.

[0165] Different from Figure 4 The second substrate 30 shown in FIG. 30 a does not include the first color filter 331 and the second color filter 333 , and may include a fourth color filter 331 a .

[0166] The fourth color filter 331a may be above the first and second light emitting areas PA1 and PA2, and may cover the light blocking member 320 between the first and second light emitting areas PA1 and PA2.

[0167] In some embodiments, the fourth color filter 331a may block or absorb light of a third color, e.g., blue light, and may selectively transmit light of a first color, e.g., red light, and light of a second color, e.g., green light. That is, the fourth color filter 331a may be used as a blue light blocking filter for blocking blue light. In some embodiments, the fourth color filter 331a may be a yellow color filter and may include a yellow colorant.

[0168] In some embodiments, the fourth color filter 331a may further include a gray colorant in addition to the yellow colorant. When the fourth color filter 331a further includes the gray colorant, reflection of external light may be more effectively prevented.

[0169] In some embodiments, the fourth color filter 331a may further include a blue colorant in addition to the yellow colorant. When the fourth color filter 331a further includes the blue colorant, a blue wavelength band portion of external light may be prevented from entering the first and second wavelength conversion patterns 341 and 343, and thus light color-converted due to the external light may be prevented from being emitted from the first and second wavelength conversion patterns 341 and 343.

[0170] In some embodiments, the fourth color filter 331 a may include both a gray colorant and a blue colorant in addition to the yellow colorant.

[0171] In some embodiments, when the second substrate 30a includes the fourth color filter 331a, the first organic light emitting element ED1 may emit only blue light and may not emit green light. For example, the first organic light emitting element ED1 may include only a blue light emitting layer as a light emitting layer. This configuration is to prevent light other than red light, for example, green light, from being emitted from the first light emitting area PA1. When a separate structure capable of preventing green light from being emitted from the first light emitting area PA1 is provided, the first organic light emitting element ED1 may emit not only blue light but also green light.

[0172] Fig.14 It is along Figure 3 A cross-sectional view of a display device according to another embodiment taken along line X3-X3' in FIG. Fig.14 According to the display device 1b of this embodiment, Figure 4 The display device 1 shown in FIG. 1 is the same as or similar to the display device 1 shown in FIG. 1 , except that the configuration of the second substrate 30b of the display device 1b is different from the configuration of the second substrate 30 of the display device 1. Therefore, the differences will be mainly described below.

[0173] Different from Figure 4 In the second substrate 30 shown in FIG. 3 , the second substrate 30 b does not include the third color filter 335 and may include a light-transmitting pattern 345 a. Figure 4 As shown in , since the second substrate 30 b does not include the third color filter 335 , in some embodiments, the first capping layer 351 may contact the light blocking member 320 and the second base portion 310 .

[0174] The light-transmitting pattern 345a may include a base resin 3451a and a third scatterer 3455 dispersed in the base resin 3451a, and the base resin 3451a may include a blue colorant. For example, the base resin 3451a itself may be a blue color filter.

[0175] In some embodiments, the third scatterer 3455 may be contained in the light-transmitting pattern 345a at 0.5 wt % to 10 wt %, and the blue colorant may be contained in the light-transmitting pattern 345a at 1 wt % to 10 wt %. In some embodiments, the thickness of the light-transmitting pattern 345a may be 3 μm to 13 μm, but is not limited thereto.

[0176] Fig.15 It is along Figure 3 A cross-sectional view of a display device according to another embodiment taken along line X3-X3' in FIG. Fig.15 According to the display device 1c of this embodiment, Fig.14The display device 1b shown in FIG. 1 is the same as that shown in FIG. 1 , except that the second substrate 30c of the display device 1c does not include the first color filter 331 and the second color filter 333 but includes a fourth color filter 331a. Since the detailed description of the fourth color filter 331a is the same as that already described with reference to FIG. Fig.13 The detailed descriptions described are substantially the same, so their detailed descriptions will be omitted.

[0177] Fig.16 It is along Figure 3 A cross-sectional view of a display device according to another embodiment taken along line X3-X3' in FIG. Fig.16 According to the display device 1d of this embodiment, Figure 4 The display device 1 shown in FIG. 1 is substantially the same except that the second substrate 30 d of the display device 1 d includes a partition wall 360 .

[0178] The partition wall 360 may be between two adjacent light emitting areas. In some embodiments, the partition wall 360 may be in the non-light emitting area PB and may surround the first light emitting area PA1, the second light emitting area PA2, and the third light emitting area PA3. In some embodiments, the planar shape of the partition wall 360 may be a lattice shape.

[0179] When the first and second wavelength conversion patterns 341 and 343 are formed by an inkjet method using an ink composition, the partition wall 360 may serve as a guide for stably placing the ink composition for forming the first and second wavelength conversion patterns 341 and 343 at desired positions.

[0180] In some embodiments, the partition wall 360 may be translucent. The light transmittance of the partition wall 360 may be about 90% or more, about 95% or more, about 98% or more, or about 99% or more.

[0181] The material of the partition wall 360 may be a material having excellent light transmittance, and may be an organic material, for example, epoxy resin or acrylic resin. Specific examples of organic materials may include ethylene glycol (meth) acrylate polymers, polyethylene glycol di (meth) acrylate polymers, dimethylolpropane di (meth) acrylate polymers, trimethylolpropane tri (meth) acrylate polymers, pentaerythritol tri (meth) acrylate polymers, pentaerythritol tetra (meth) acrylate polymers, propylene glycol di (meth) acrylate polymers, dipentaerythritol penta (meth) acrylate polymers, dipentaerythritol hexa (meth) acrylate polymers, bisphenol A epoxy (meth) acrylate polymers, triacryloxyethyl phosphate polymers, and cardo epoxy diacrylate polymers.

[0182] When the partition wall 360 is made of an organic material, the partition wall 360 may be made of a photosensitive organic material. The photosensitive organic material may be a negative photosensitive material in which curing occurs at a site irradiated with light.

[0183] In some embodiments, the partition wall 360 may be made of a material having a lower refractive index than the first and second wavelength conversion patterns 341 and 343. In this case, the partition wall 360 may have a function similar to that of the first and second low refractive index layers 391 and 393 described above.

[0184] In some embodiments, the isolation wall 360 may extend between the second capping layer 353 and the third capping layer 355. In this case, the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343 may directly contact the isolation wall 360, for example, the sidewall of the isolation wall 360. The light-transmitting pattern 345 may also directly contact the sidewall of the isolation wall 360. Alternatively or additionally, the isolation wall 360 may extend between the first capping layer 351 and the light blocking member 320. When the isolation wall 360 is only between the first capping layer 351 and the light blocking member 320, the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343 may not directly contact the isolation wall 360.

[0185] Figures 17 to 19 It is along Figure 3 A cross-sectional view of a display device according to other embodiments taken along line X3 - X3 ′ in FIG.

[0186] refer to Figures 17 to 19 , Fig.17 The display device 1e shown in FIG. Fig.13 The display device 1a shown in FIG. 1 is substantially the same except that the second substrate 30e of the display device 1e includes a partition wall 360. In addition, Fig.18 The display device 1f shown in FIG. Fig.14 The display device 1b shown in FIG. 1 is substantially the same except that the second substrate 30f of the display device 1f includes a partition wall 360. In addition, Fig.19 The display device 1g shown in FIG. Fig.15 The display device 1c shown in FIG. 1 is substantially the same except that the second substrate 30g of the display device 1g includes a partition wall 360. Since the description of the partition wall 360 is the same as that of the above reference Fig.16 The description is the same as that of , so its description will be omitted.

[0187] Fig. 20 It is along Figure 3 A cross-sectional view of a display device according to another embodiment taken along line X3-X3' in FIG. Fig. 20 According to this embodiment, the display device 2 and Figure 4The display device 1 shown in FIG. 1 is the same as or similar to the display device 1 shown in FIG. 1 , except that the first substrate 10a of the display device 2 includes Figure 4 1 and 2. The other components of the first substrate 10 and the second substrate 30 shown in FIG. 30 except the second base portion 310 are shown in FIG. 30 , and unlike the second substrate 30 of the display device 1, the second substrate 30h of the display device 2 includes only the second base portion 310. Therefore, the differences will be mainly described below.

[0188] The first substrate 10a will be described below. The first low refractive index layer 391a is on the thin film encapsulation layer 170. The refractive index of the first low refractive index layer 391a may be lower than the refractive indexes of the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343. The first low refractive index layer 391a may have the same function as Figure 4 The functions of the second low refractive index layer 393 of the display device 1 shown in are substantially the same. For example, the first low refractive index layer 391a may reflect light traveling from the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343 toward the first base portion 110, and may provide the reflected light toward the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343. Since a further detailed description of the first low refractive index layer 391a is substantially the same as that of the second low refractive index layer 393 of the display device 1, a detailed description thereof will be omitted.

[0189] The protective layer 370 may be on the first low refractive index layer 391a, and the first capping layer 351a may be on the protective layer 370. The first capping layer 351a may encapsulate the first wavelength conversion pattern 341, the second wavelength conversion pattern 343, and the light-transmitting pattern 345 together with the second capping layer 353a to be described later. Since a further detailed description of the first capping layer 351a is substantially the same as or similar to the description of the third capping layer 355 of the display device 1, its detailed description will be omitted.

[0190] In the first emission area PA1, the first wavelength conversion pattern 341 may be on the first capping layer 351a, and in the second emission area PA2, the second wavelength conversion pattern 343 may be on the first capping layer 351a. In addition, in the third emission area PA3, the light-transmitting pattern 345 may be on the first capping layer 351a.

[0191] The second capping layer 353a may be on the first wavelength conversion pattern 341, the second wavelength conversion pattern 343, and the light-transmitting pattern 345. The second capping layer 353a may encapsulate the first wavelength conversion pattern 341, the second wavelength conversion pattern 343, and the light-transmitting pattern 345 together with the first capping layer 351a. Since a further detailed description of the second capping layer 353a is substantially the same as or similar to the description of the second capping layer 353 of the display device 1, a detailed description thereof will be omitted.

[0192] The second low refractive index layer 393a is on the second capping layer 353a. The refractive index of the second low refractive index layer 393a may be lower than the refractive indexes of the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343. The second low refractive index layer 393a may have the same function as Figure 4 . For example, the second low refractive index layer 393a may reflect light that is not converted by the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343, traveling in a direction toward the second base portion 310, and may make the reflected light incident again on the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343. Since a further detailed description of the second low refractive index layer 393a is substantially the same as that of the first low refractive index layer 391 of the display device 1, a detailed description thereof will be omitted.

[0193] The third capping layer 355a may be on the second low refractive index layer 393a. The third capping layer 355a may cover the second low refractive index layer 393a. Since further detailed description of the third capping layer 355a is substantially the same as the description of the first capping layer 351 of the display device 1, its detailed description will be omitted.

[0194] In some embodiments, the light blocking member 320 may be on the third capping layer 355a. The light blocking member 320 may be in the non-light emitting region PB, and may not be in the first, second, and third light emitting regions PA1, PA2, and PA3.

[0195] In the first emission area PA1, the first color filter 331 may be on the third capping layer 355a, in the second emission area PA2, the second color filter 333 may be on the third capping layer 355a, and in the third emission area PA3, the third color filter 335 may be on the third capping layer 355a.

[0196] The second substrate 30h may include a second base portion 310, and a filler 70 may be between the first substrate 10a and the second substrate 30h. In some embodiments, the filler 70 may be between the first color filter 331 and the second base portion 310, between the second color filter 333 and the second base portion 310, and between the third color filter 335 and the second base portion 310. In the case of the display device 2 according to this embodiment, there is an advantage of reducing the alignment tolerance between components in each light emitting area (for example, the alignment tolerance between the organic light emitting element and the wavelength conversion pattern, or the alignment tolerance between the pixel defining film and the light blocking member).

[0197] Fig.21 It is along Figure 3 A cross-sectional view of a display device according to another embodiment taken along line X3-X3' in FIG. Fig.21According to the display device 2a of this embodiment, Fig. 20 The display device 2 shown in FIG. 1 is substantially the same as the display device 2 shown in FIG. 1 , except that the first substrate 10b of the display device 2a does not include the first color filter 331 and the second color filter 333, but includes a fourth color filter 331a, which is different from the first color filter 331a of FIG. Fig. 20 Since the detailed description of the fourth color filter 331a is the same as that of the above reference Fig.13 The descriptions are basically the same, so their detailed descriptions will be omitted.

[0198] Fig. 22 It is along Figure 3 A cross-sectional view of a display device according to another embodiment taken along line X3-X3' in FIG. Fig. 22 According to the display device 2b of this embodiment, Fig. 20 The display device 2 shown in FIG. 1 is different in that the first substrate 10c of the display device 2b may not include the third color filter 335 and may include a light-transmitting pattern 345a instead of the light-transmitting pattern 345, unlike the first substrate 10a of the display device 2. When the third color filter 335 is omitted, the filler 70 may contact the light blocking member 320 and the third capping layer 355a.

[0199] As mentioned above Fig.14 In the description of FIG. 3 , the light-transmitting pattern 345a may include a base resin 3451a and a third scatterer 3455 dispersed in the base resin 3451a, and the base resin 3451a may include a blue colorant. For example, the base resin 3451a itself may be a blue color filter. Since the detailed description of the light-transmitting pattern 345a is the same as that of the above reference Fig.14 The descriptions are basically the same, so their detailed descriptions will be omitted.

[0200] Fig.23 It is along Figure 3 A cross-sectional view of a display device according to another embodiment taken along line X3-X3' in FIG. Fig.23 According to the display device 2c of this embodiment, Fig. 22 The display device 2b shown in FIG. 1 is substantially the same except that the first substrate 10d of the display device 2c does not include the first color filter 331 and the second color filter 333, but includes a fourth color filter 331a. Since the detailed description of the fourth color filter 331a is the same as that of the above reference Fig.13 The descriptions are basically the same, so their detailed descriptions will be omitted.

[0201] Fig.24 It is along Figure 3 A cross-sectional view of a display device according to another embodiment taken along line X3-X3' in FIG. Fig.24 According to the display device 2d of this embodiment, Fig. 20The display device 2 shown in FIG. 2 is substantially the same except that the first substrate 10 e of the display device 2 d includes a partition wall 360 .

[0202] The partition wall 360 may be between two adjacent light emitting regions. Fig.16 As described above, the partition wall 360 may be in the non-light emitting area PB, and may surround the first light emitting area PA1, the second light emitting area PA2, and the third light emitting area PA3.

[0203] In some embodiments, Fig.24 As shown in , the isolation wall 360 may be on the first capping layer 351a, and the second capping layer 353a may be on the isolation wall 360. In another embodiment, the isolation wall 360 may be between the first capping layer 351a and the thin film encapsulation layer 170. Illustratively, the isolation wall 360 may be between the first capping layer 351a and the protective layer 370 or between the first low refractive index layer 391a and the protective layer 370. Since the detailed description of the isolation wall 360 is the same as that of the above reference Fig.16 The descriptions are basically the same, so their detailed descriptions will be omitted.

[0204] Figure 25 to Figure 27 It is along Figure 3 A cross-sectional view of a display device according to another embodiment taken along line X3-X3' in FIG. Figure 25 to Figure 27 , Fig.25 The display device 2e shown in FIG. Fig.21 The display device 2a shown in FIG. 1 is substantially the same except that the first substrate 10f of the display device 2e includes a partition wall 360. In addition, Fig.26 The display device 2f shown in FIG. Fig. 22 The display device 2b shown in FIG. 1 is substantially the same except that the first substrate 10g of the display device 2f includes a partition wall 360. In addition, Fig. 27 The display device 2g shown in FIG. Fig.23 The display device 2c shown in FIG. 1 is substantially the same except that the first substrate 10h of the display device 2g includes a partition wall 360. Since the description of the partition wall 360 is the same as that of the above reference Fig.16 and Fig.24 The description is the same as that of , so its description will be omitted.

[0205] The display device according to the above embodiment can use the light emitted from the organic light emitting element to compensate for the difference in the amount of light of each color caused by the difference in the light conversion efficiency of the wavelength conversion pattern. Therefore, the difference in the amount of light of each color of the emitted light can be reduced, and thus the color reproducibility and display quality of the display device can be improved.

[0206] As described above, according to the embodiments, a display device having improved brightness and color reproducibility may be implemented.

[0207] Example embodiments have been disclosed herein, and although specific terms are used, they are used and interpreted only in a general and illustrative sense and not for limiting purposes. In some cases, unless otherwise specifically indicated, features, characteristics, and / or elements described in conjunction with a particular embodiment may be used alone or in combination with features, characteristics, and / or elements described in conjunction with other embodiments, as would be apparent to one of ordinary skill in the art upon submitting the present invention. Therefore, it should be understood by those skilled in the art that various changes in form and detail may be made without departing from the spirit and scope of the present invention as set forth in the following claims.

Claims

1. A display device, comprising: a first light emitting area and a second light emitting area; a first pixel electrode in the first light emitting area; a second pixel electrode in the second light emitting area; A first organic layer in the first light-emitting region, the first organic layer comprising a first light-emitting layer on the first pixel electrode and a second light-emitting layer on the first light-emitting layer; a second organic layer in the second light emitting region, the second organic layer comprising a third light emitting layer on the second pixel electrode; a common electrode on the first organic layer and the second organic layer; a first wavelength conversion pattern on the common electrode, the first wavelength conversion pattern overlapping the first organic layer and converting the wavelength of light of a first color into light of a second color different from the first color; and a light-transmitting pattern, the light-transmitting pattern being on the common electrode and overlapping the second organic layer, wherein The third light-emitting layer emits light of the first color, One of the first light-emitting layer and the second light-emitting layer emits light of the first color, The other of the first light emitting layer and the second light emitting layer emits light of the second color, and the first organic layer does not emit light of a third color having a longer peak wavelength than the light of the first color and the light of the second color, The second organic layer further includes a fifth light-emitting layer on the third light-emitting layer and a sixth light-emitting layer on the fifth light-emitting layer, Any one of the fifth light-emitting layer and the sixth light-emitting layer emits light of the first color, The other of the fifth light-emitting layer and the sixth light-emitting layer emits light of the second color, and The second color is green.

2. The display device according to claim 1, wherein the light of the first color has a peak wavelength in the range of 430nm to 470nm, the light of the second color has a peak wavelength in the range of 510nm to 550nm, and the light of the third color has a peak wavelength in the range of 610nm to 650nm.

3. The display device according to claim 1, wherein: The first organic layer further includes a fourth light emitting layer between the second light emitting layer and the common electrode, Any one of the first light-emitting layer, the second light-emitting layer, and the fourth light-emitting layer emits light of the second color, and The other two of the first light-emitting layer, the second light-emitting layer, and the fourth light-emitting layer emit light of the first color.

4. The display device according to claim 1, further comprising: A first color filter is on the first wavelength conversion pattern, overlaps the first organic layer, transmits the second color light and blocks the first color light.

5. The display device according to claim 4, further comprising: A second color filter is on the light-transmitting pattern, overlaps the second organic layer, transmits the light of the first color, and blocks the light of the second color and the light of the third color.

6. The display device according to claim 5, further comprising: A light blocking member is on a non-light emitting area between the first light emitting area and the second light emitting area, the light blocking member overlapping a portion of the first color filter and a portion of the second color filter.

7. The display device according to claim 4, further comprising: A first low refractive index layer is between the first wavelength conversion pattern and the first color filter, the first low refractive index layer having a lower refractive index than the first wavelength conversion pattern.

8. The display device according to claim 7, further comprising: A second low refractive index layer is provided between the first wavelength conversion pattern and the common electrode, and the second low refractive index layer has a lower refractive index than the first wavelength conversion pattern.

9. The display device according to claim 1, wherein the light-transmitting pattern comprises: base resin, and Scatterers in the base resin. 10 . The display device of claim 9 , wherein the light-transmitting pattern transmits the light of the first color and blocks the light of the second color and the light of the third color.

11. The display device according to claim 1, further comprising: a thin film encapsulation layer on the common electrode; a substrate on the thin film encapsulation layer; and A filler between the thin film encapsulation layer and the substrate includes an organic material. 12 . The display device of claim 11 , wherein the first wavelength conversion pattern and the light-transmitting pattern are between the substrate and the filler.

13. The display device according to claim 11, wherein: The first wavelength conversion pattern is on the thin film encapsulation layer, and The filler is between the first wavelength conversion pattern and the substrate.

14. The display device according to claim 13, further comprising: A partition wall is between the first wavelength conversion pattern and the light-transmitting pattern, and a side wall of the partition wall contacts the first wavelength conversion pattern.

15. A display device, comprising: Luminous area; A pixel electrode in the light emitting area; an organic layer on the pixel electrode, the organic layer comprising a first light-emitting layer, a second light-emitting layer overlapping the first light-emitting layer, and a third light-emitting layer overlapping the first light-emitting layer and the second light-emitting layer; a common electrode on the organic layer; a wavelength conversion pattern, the wavelength conversion pattern being on the common electrode and converting the wavelength of blue light into green light; and The blue light blocking filter on the wavelength conversion pattern, wherein Any one of the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer emits green light, and The other two of the first light-emitting layer, the second light-emitting layer and the third light-emitting layer emit blue light, The display device further comprises: a first capping layer between the blue light blocking filter and the wavelength conversion pattern; and a second capping layer, the second capping layer being between the wavelength conversion pattern and the common electrode, The first capping layer and the second capping layer include inorganic materials. The display device according to claim 15 , wherein the organic layer does not include a light emitting layer for emitting red light. 17 . The display device of claim 15 , wherein the wavelength conversion pattern comprises a base resin, and a wavelength converter and a scatterer dispersed in the base resin. The display device according to claim 17 , wherein the wavelength converter is a quantum dot.

19. The display device according to claim 15, further comprising: a first low refractive index layer between the wavelength conversion pattern and the blue light blocking filter, The refractive index of the first low-refractive index layer is lower than the refractive index of the wavelength conversion pattern. 20 . The display device of claim 19 , wherein the refractive index of the first low refractive index layer is 1.1 to 1.4, and a difference between the refractive index of the wavelength conversion pattern and the refractive index of the first low refractive index layer is 0.3 or more.

21. The display device according to claim 19, further comprising: A second low refractive index layer is provided between the wavelength conversion pattern and the common electrode, wherein a refractive index of the second low refractive index layer is lower than the refractive index of the wavelength conversion pattern.

22. The display device according to claim 19, Wherein the first capping layer is between the blue light blocking filter and the first low refractive index layer.

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