Display device

Abstract

To provide a display that has a long life and high luminous efficiency.SOLUTION: A display includes a light-emitting element layer LDL that emits first color light, and a light control layer WCL that is arranged on the light-emitting element layer LDL. The light control layer WCL includes a first light control unit WCL1 including a first luminous body that emits second color light in a wavelength region shorter than that of the first color light, a second light control unit WCL2 that transmits the first color light therethrough, and a third light control unit WCL3 including a second luminous body that emits third color light in a wavelength region longer than that of the first color light. The first light control unit WCL1 through the third light control unit WCL3 are separated from each other on a plane. The first color light is green light having a center wavelength of 500 nm or more and 580 nm or less; the second color light is blue light having a center wavelength of 420 nm or more and 480 nm or less; the third color light is red light having a center wavelength of 600 nm or more and 670 nm or less.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a display device, and more particularly to a display device including a light emitting element layer and a light control layer. [Background technology]

[0002] Display devices including self-luminous elements are being actively developed as image display devices. Unlike liquid crystal display devices, optical display devices including self-luminous elements are display devices that realize display by recombining holes and electrons injected from a first electrode and a second electrode in an emission layer to cause organic or inorganic materials contained in the emission layer to emit light. Meanwhile, various researches are being conducted to improve the life span of display devices. Summary of the Invention [Problem to be solved by the invention]

[0003] An object of the present invention is to provide a display device having a long life and high luminous efficiency. [Means for solving the problem]

[0004] A display device according to an embodiment of the present invention includes a light emitting element layer and a light control layer. The light emitting element layer emits a first color light. The light control layer is disposed on the light emitting element layer. The light control layer includes a first light controller, a second light controller, and a third light controller. The first light controller includes a first light emitter that emits a second color light in a shorter wavelength region than the first color light. The second light controller transmits the first color light. The third light controller includes a second light emitter that emits a third color light in a longer wavelength region than the first color light. The first to third light controllers are spaced apart from each other on a plane.

[0005] The first color light is green light having a central wavelength of 500 nm or more and 580 nm or less, the second color light is blue light having a central wavelength of 420 nm or more and 480 nm or less, and the third color light is red light having a central wavelength of 600 nm or more and 670 nm or less.

[0006] The first light control portion further includes an auxiliary light emitting body.

[0007] The auxiliary light emitter absorbs the first color light, becomes excited, and transfers energy to the first light emitter.

[0008] The first lowest triplet energy level of the first luminescent material is greater than 1.2 eV and less than the second lowest triplet energy level of the auxiliary luminescent material, the second lowest triplet energy level being 2.5 eV or less.

[0009] The lowest singlet energy level of the first emitter is not less than 2.5 eV and not more than 3.1 eV.

[0010] The first luminescent material is a fluorescent luminescent material, and the auxiliary luminescent material is a phosphorescent luminescent material or a thermally activated delayed fluorescent luminescent material.

[0011] The first luminescent material is an anthracene derivative, and the luminescent auxiliary material is a porphyrin-metal complex.

[0012] The first emitter is a quantum dot.

[0013] The second emitter is a quantum dot.

[0014] The display device of one embodiment further includes a color filter layer. The color filter layer is disposed on the light control layer. The color filter layer includes a first color filter, a second color filter, and a third color filter. The first color filter overlaps with the first light control unit and transmits a second color light. The second color filter overlaps with the second light control unit and transmits a first color light. The third color filter overlaps with the third light control unit and transmits a third color light.

[0015] The light-emitting element layer includes a light-emitting element. The light-emitting element includes a first electrode, a second electrode, and at least one light-emitting portion. The at least one light-emitting portion is disposed between the first electrode and the second electrode. The at least one light-emitting portion includes a hole transport region, a light-emitting layer, and an electron transport region. The light-emitting layer is disposed on the hole transport region. The electron transport region is disposed on the light-emitting layer.

[0016] The light-emitting layer includes a host and a dopant, the dopant including at least one of a phosphorescent dopant, a fluorescent dopant, and a thermally activated delayed fluorescent dopant.

[0017] The light-emitting layer emits phosphorescence.

[0018] The at least one light emitting portion includes a plurality of light emitting portions stacked in sequence. The light emitting device further includes a charge generating layer disposed between the plurality of light emitting portions.

[0019] A display device according to an embodiment of the present invention includes a display panel including a display region and a non-display region. The display region includes a blue light-emitting region, a green light-emitting region, and a red light-emitting region. The non-display region is adjacent to the display region. The display panel includes a light-emitting element layer and a light control layer. The light-emitting element layer emits green light. The light control layer is disposed on the light-emitting element layer. The light control layer includes a first light control unit, a second light control unit, and a third light control unit. The first light control unit overlaps the blue light-emitting region and absorbs the green light to emit blue light. The second light control unit overlaps the green light-emitting region and transmits the green light. The third light control unit overlaps the red light-emitting region and absorbs the green light to emit red light.

[0020] The first light control unit includes a first light emitter and a light-emitting auxiliary. The first light emitter has a first lowest triplet energy level greater than 1.2 eV and less than a second lowest triplet energy level of the light-emitting auxiliary. The second lowest triplet energy level of the light-emitting auxiliary is 2.5 eV or less.

[0021] A display device according to an embodiment of the present invention includes a light emitting element layer and a light control layer. The light emitting element layer includes a plurality of light emitting elements. The light control layer is disposed on the light emitting element layer. Each of the plurality of light emitting elements includes a first electrode, a second electrode, and at least one light emitting portion. The second electrode is disposed on the first electrode. The at least one light emitting portion is disposed between the first electrode and the second electrode. The at least one light emitting portion includes a hole transport region, a light emitting layer, and an electron transport region. The light emitting layer is disposed on the hole transport region and emits green light. The electron transport region is disposed on the light emitting layer. The light control layer includes a first light control portion, a second light control portion, and a third light control portion. The first light control portion absorbs the green light and emits blue light. The second light control portion transmits the green light. The third light control portion absorbs the green light and emits red light.

[0022] The light emitting element layer includes a first light emitting section, a second light emitting section, and a charge generation layer. The second light emitting section is disposed on the first light emitting section. The charge generation layer is disposed between the first light emitting section and the second light emitting section.

[0023] The first light control unit includes a first light emitter and a light-emitting auxiliary. The first light emitter has a first lowest triplet energy level greater than 1.2 eV. The second lowest triplet energy level of the light-emitting auxiliary is greater than the first lowest triplet energy level of the first light emitter and is equal to or less than 2.5 eV.

[0024] The first luminescent material is represented by the following Chemical Formula 1: TIFF0007619764000001.tif57170In the above Chemical Formula 1, R 1 ~R 10are each independently a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted silyl group, a substituted or unsubstituted alkyl group having from 1 to 50 carbon atoms, a substituted or unsubstituted aryl group having from 6 to 50 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having from 2 to 50 ring carbon atoms, or are bonded to an adjacent group to form a ring. a and b are each independently an integer of from 0 to 5. Effect of the Invention

[0025] A display device according to an embodiment of the present invention achieves a long life and high luminous efficiency. [Brief description of the drawings]

[0026] [Figure 1] 1 is a perspective view of a display device according to an embodiment of the present invention; [Diagram 2] FIG. 1 is an exploded perspective view of a display device according to an embodiment of the present invention. [Diagram 3] FIG. 2 is a cross-sectional view of a display panel according to an embodiment of the present invention. [Figure 4] FIG. 2 is a plan view of a display panel according to an embodiment of the present invention. [Diagram 5] 5 is a cross-sectional view of the display panel taken along line II' in FIG. 4. [Figure 6a] 1 is a cross-sectional view of a light emitting device according to an embodiment. [Figure 6b] 1 is a cross-sectional view of a light emitting device according to an embodiment. [Figure 7a] FIG. 2 is an enlarged cross-sectional view of a light control layer according to an embodiment. [Figure 7b] FIG. 2 is an enlarged cross-sectional view of a light control layer according to an embodiment. [Figure 8a] FIG. 2 is a diagram simply illustrating energy transfer between a first light emitter and an auxiliary light emitter included in a display device of an embodiment. [Figure 8b] FIG. 2 is a diagram simply illustrating energy transfer between a first light emitter and an auxiliary light emitter included in a display device of an embodiment. [Figure 9] FIG. 2 is a cross-sectional view of a display panel according to an embodiment of the present invention. [Figure 10]1 is a cross-sectional view of a light emitting device according to an embodiment. [Figure 11] FIG. 2 is a cross-sectional view of a display panel according to an embodiment of the present invention. [Figure 12] FIG. 2 is a cross-sectional view of a display panel according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] As used herein, when a component (or region, layer, portion, etc.) is referred to as being "on," "connected," or "coupled" to another component, it means that it is directly disposed on, connected, or coupled to the other component, or that there is a third component disposed therebetween.

[0028] The same reference numerals refer to the same components. Also, in the drawings, thicknesses, proportions and dimensions of the components are exaggerated for the purpose of effectively explaining the technical contents.

[0029] "And / or" includes all combinations of one or more of the associated construct.

[0030] Terms such as "first" and "second" are used to describe various components, but the components are not limited to the terms. The terms are used only to distinguish one structural element from another. For example, the first component may be expressed as the second component, and similarly, the second component may be expressed as the first component, without departing from the scope of the present invention. A singular expression includes a plural expression unless the context clearly indicates otherwise.

[0031] In addition, terms such as "under", "below", "up" and "above" are used to describe the relative relationship of the components shown in the drawings. The terms are relative concepts and are described based on the directions shown in the drawings.

[0032] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which the present invention belongs. Furthermore, terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art, and unless interpreted in an idealized or overly formal sense, are to be interpreted as explicitly defined herein.

[0033] It should be understood that the terms "comprise" or "have" specify the presence of any feature, numeral, step, operation, component, part, or combination thereof described hereinabove in the specification, but do not preclude the presence or additional possibility of one or more other features, numerals, steps, operations, components, parts, or combinations thereof.

[0034] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0035] FIG. 1 is a perspective view of a display device DD according to an embodiment. FIG. 2 is an exploded perspective view of the display device DD according to an embodiment. FIG. 3 is a cross-sectional view of a display panel DP according to an embodiment. FIG. 4 is a plan view of the display panel DP according to an embodiment. FIG. 5 is a cross-sectional view of the display panel DP taken along line I-I' in FIG. 4. FIGS. 6a and 6b are cross-sectional views of a light-emitting element LD according to an embodiment.

[0036] Referring to FIG. 1, a display device DD includes a display area DA and a non-display area NDA. The display area DA is an area where an image IM is displayed. In FIG. 1, a butterfly is shown as an example of an image IM. The non-display area NDA is an area where an image IM is not displayed. Pixels (not shown) are arranged in the display area DA, and no pixels (not shown) are arranged in the non-display area NDA. The pixels (not shown) refer to effective pixels that provide the image IM.

[0037] The display area DA is parallel to a plane defined by the first directional axis DR1 and the second directional axis DR2. The normal direction of the display area DA, i.e., the thickness direction of the display device DD, is the direction of the third directional axis DR3. The front (or top) and rear (or bottom) of each component are separated in the third direction DR3. However, the directions indicated by the first to third directions DR1, DR2, and DR3 are relative concepts and may be converted to other directions. Hereinafter, the first to third directions are directions indicated by the first to third directional axes DR1, DR2, and DR3, respectively, and refer to the same drawing symbols.

[0038] The display device DD is used in large electronic devices such as televisions, monitors, or external advertising boards, as well as small and medium-sized electronic devices such as personal computers, notebook computers, PDAs, car navigation units, game consoles, portable electronic devices, and cameras, etc. These are merely presented as examples, and may be adopted in other electronic devices without departing from the concept of the present invention.

[0039] The non-display area NDA defines a bezel area of ​​the display device DD. The non-display area NDA is an area adjacent to the display area DA. The non-display area NDA surrounds the display area DA. However, this is not limited thereto, and the shape of the display area DA and the shape of the non-display area NDA may be designed relatively. In other embodiments of the present invention, the non-display area NDA may be omitted.

[0040] 2, the display device includes a bottom cover BC, a display panel DP, and a top cover TC. The bottom cover BC is disposed under the display panel DP to protect the display device DD from external impacts and contaminants.

[0041] In another embodiment of the present invention, the top cover TC may be omitted. In the case of a display device DD without a top cover TC, a non-display area NDA is defined by a sealing member or a mold.

[0042] The top cover TC protects the display panel DP and the like from external impacts and contaminants. An opening OP-TC in the top cover TC exposes the front surface of the display panel DP and defines a display area DA.

[0043] 2 and 3, the display panel DP includes a first display substrate 100 and a second display substrate 200. The second display substrate 200 is disposed on the first display substrate 100. The first display substrate 100 includes a base film BF, a circuit layer CL, and a light emitting element layer LDL. The second display substrate 200 includes a light control layer WCL and a base substrate BS.

[0044] The base film BF is a member that provides a base surface on which the circuit layer CL is disposed. The base film BF is a silicon substrate, a plastic substrate, a glass substrate, a metal substrate, or a laminated structure including multiple insulating layers. However, the embodiment is not limited thereto, and the base film BF may be an inorganic layer, an organic layer, or a composite material layer.

[0045] The circuit layer CL is disposed on the base film BF. The circuit layer CL includes a plurality of transistors (not shown). Each of the transistors (not shown) includes a control electrode, an input electrode, and an output electrode. For example, the circuit layer CL may include a switching transistor (not shown) and a driving transistor (not shown) for driving the light emitting element LD.

[0046] The light-emitting element layer LDL includes a plurality of light-emitting elements LD and a thin-film encapsulation layer TFE, which covers the light-emitting elements LD and is disposed directly on the light-emitting elements LD to seal the light-emitting elements LD.

[0047] The light control layer WCL is disposed on the thin-film encapsulation layer TFE. Although not separately illustrated, an adhesive member (not illustrated) is disposed between the light control layer WCL and the thin-film encapsulation layer TFE. The adhesive member (not illustrated) adheres the light control layer WCL and the thin-film encapsulation layer TFE. The adhesive member (not illustrated) may be, for example, an optically clear adhesive. The light control layer WCL absorbs light emitted from the light emitting element layer LDL and emits light having a central wavelength in a wavelength range different from the absorbed light, or transmits the light emitted from the light emitting element layer LDL. The base substrate BS serves as a support substrate that supports the light control layer WCL. The base substrate BS is a glass substrate or a plastic substrate.

[0048] 4 and 5, the display panel DP includes a non-emissive area NPXA and emissive areas PXA1, PXA2, and PXA3. The emissive areas PXA1, PXA2, and PXA3 are areas into which light generated from the respective light-emitting elements LD is emitted. The areas of the emissive areas PXA1, PXA2, and PXA3 may be different from each other, and in this case, the areas refer to the areas when viewed from a plane. In this specification, "from a plane" refers to the display device DD when viewed in the third direction DR3 (thickness direction). The emissive areas PXA1, PXA2, and PXA3 are divided into a number of groups according to the colors of the light generated from the light-emitting elements LD (FIG. 4).

[0049] The display panel DP of the embodiment shown in Figures 4 and 5 exemplarily shows three light-emitting areas PXA1, PXA2, and PXA3 that emit the second color light, the first color light, and the third color light. For example, the display panel DP of the embodiment may include a first light-emitting area PXA1, a second light-emitting area PXA2, and a third light-emitting area PXA3 that are separated from each other.

[0050] In one embodiment, the display panel DP includes a plurality of light emitting elements LD that emit first color light, and light controllers WCL1, WCL2, and WCL3 that absorb or transmit the first color light to emit light of different wavelength regions. Each of the light controllers WCL1, WCL2, and WCL3 absorbs or transmits the first color light to emit light of different colors. For example, in one embodiment, the first light controller WCL1 may absorb the first color light to emit a second color light, the second light controller WCL2 may transmit the first color light, and the third light controller WCL3 may absorb the first color light to emit a third color light. The first color light is a light of a longer wavelength region than the second color light and a light of a shorter wavelength region than the third color light. The embodiment is not limited thereto, but for example, the first color light may be green light, the second color light may be blue light, and the third color light may be red light. For example, the first color light may be green light having a central wavelength of 500 nm or more and 580 nm or less, the second color light may be blue light having a central wavelength of 420 nm or more and 480 nm or less, and the third color light may be red light having a central wavelength of 600 nm or more and 670 nm or less. More specifically, the first color light may be green light having a central wavelength of 515 nm or more and 545 nm or less.

[0051] The light control units WCL1, WCL2, and WCL3 are arranged corresponding to the first light-emitting region PXA1, the second light-emitting region PXA2, and the third light-emitting region PXA3, respectively, and overlap with the first light-emitting region PXA1, the second light-emitting region PXA2, and the third light-emitting region PXA3 on a plane. For example, the first light-emitting region PXA1 may be a blue light-emitting region, the second light-emitting region PXA2 may be a green light-emitting region, and the third light-emitting region PXA3 may be a red light-emitting region.

[0052] In the display panel DP according to an embodiment shown in Fig. 4 and Fig. 5, the light emitting regions PXA1, PXA2, PXA3 have different areas according to the colors emitted from the light controllers WCL1, WCL2, WCL3 of the light control layer WCL. For example, referring to Fig. 4 and Fig. 5, the first light emitting region PXA1 of the first light controller WCL1 emitting the second color light may have the largest area, and the second light emitting region PXA2 of the second light controller WCL2 emitting the first color light may have the smallest area. However, the embodiment is not limited thereto, and the light emitting regions PXA1, PXA2, PXA3 may have the same area, or the light emitting regions PXA1, PXA2, PXA3 may be provided with area ratios different from those shown in Fig. 4 and Fig. 5.

[0053] Each of the light-emitting regions PXA1, PXA2, and PXA3 is a region divided by a pixel definition film PDL. The non-light-emitting region NPXA is a region between the adjacent light-emitting regions PXA1, PXA2, and PXA3, and corresponds to the pixel definition film PDL. Meanwhile, in this specification, each of the light-emitting regions PXA1, PXA2, and PXA3 corresponds to a pixel (Pixel).

[0054] The pixel defining layer PDL is made of a polymer resin. For example, the pixel defining layer PDL is formed to include a polyacrylate resin or a polyimide resin. The pixel defining layer PDL may be formed to further include an inorganic material in addition to the polymer resin. Meanwhile, the pixel defining layer PDL is formed to include a light absorbing material, or a black pigment or a black dye. The pixel defining layer PDL formed to include a black pigment or a black dye realizes a black pixel defining layer. When forming the pixel defining layer PDL, carbon black or the like may be used as the black pigment or black dye, but the embodiment is not limited thereto.

[0055] Also, the pixel definition film PDL is made of an inorganic material. For example, the pixel definition film PDL may be patterned to include silicon nitride (SiNx), silicon oxide (SiOx), silicon nitride oxide (SiOxNy), etc. The pixel definition film PDL defines the light emitting areas PXA1, PXA2, PXA3. The light emitting areas PXA1, PXA2, PXA3 and the non-light emitting area NPXA are separated by the pixel definition film PDL.

[0056] The first light-emitting regions PXA1 and the third light-emitting regions PAX3 are alternately arranged along the first direction axis DR1 to form a first group PXG1, and the second light-emitting regions PXA2 are arranged along the first direction DR1 to form a second group PXG2.

[0057] The first group PXG1 is disposed apart from the second group PXG2 in the direction of the second direction axis DR2. A plurality of the first group PXG1 and the second group PXG2 are provided. The first group PXG1 and the second group PXG2 are alternately arranged along the second direction axis DR2.

[0058] Each second light-emitting area PXA2 is spaced apart from each first light-emitting area PXA1 or each third light-emitting area PXA3 in the direction of a fourth directional axis DR4. The direction of the fourth directional axis DR4 is a direction between the direction of the first directional axis DR1 and the direction of the second directional axis DR2.

[0059] The arrangement structure of the light-emitting regions PXA1, PXA2, and PXA3 shown in Fig. 4 is called a pentile structure. However, the arrangement structure of the light-emitting regions PXA1, PXA2, and PXA3 in the display device DD of an embodiment is not limited to the arrangement structure shown in Fig. 4. For example, in an embodiment, the light-emitting regions PXA1, PXA2, and PXA3 may have a stripe structure in which the first light-emitting region PXA1, the second light-emitting region PXA2, and the third light-emitting region PXA3 are alternately arranged in the second direction DR2.

[0060] Referring to FIG. 5, the light emitting element layer LDL includes a plurality of light emitting elements LD. The light emitting element LD includes a first electrode EL1, a second electrode EL2, and at least one light emitting portion EM. The first electrode layer EL1 is disposed on the circuit layer CL. The first electrode EL1 is electrically connected to a driving transistor (not shown) to receive a driving signal. The first electrode EL1 is disposed between the plurality of pixel defining layers PDL and spaced apart from each other. The second electrode layer EL2 is disposed on the first electrode layer EL1. The at least one light emitting portion EM is disposed between the first electrode EL1 and the second electrode EL2. The at least one light emitting portion EM includes a hole transport region HTR, an emission layer EML, and an electron transport region ETR.

[0061] 6a and 6b are cross-sectional views showing an example of a light-emitting element LD included in a light-emitting element layer LDL according to an embodiment. Compared to FIG. 6a, FIG. 6b is a cross-sectional view of a light-emitting element LD according to an embodiment in which the hole transport region HTR includes a hole injection layer HIL and a hole transport layer HTL, and the electron transport region ETR includes an electron injection layer EIL and an electron transport layer ETL.

[0062] The first electrode EL1 constituting the light emitting element LD has conductivity. The first electrode EL1 is made of a metal alloy or a conductive compound. The first electrode EL1 is an anode. The first electrode EL1 is a pixel electrode. In the light emitting element LD according to the embodiment, the first electrode EL1 is a reflective electrode. However, the embodiment is not limited thereto. For example, the first electrode EL1 may be a transmissive electrode or a semi-transmissive electrode. If the first electrode EL1 is a semi-transmissive electrode or a reflective electrode, the first electrode EL1 includes Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF / Ca, LiF / Al, Mo, Ti, or a compound or mixture thereof (for example, a mixture of Ag and Mg). Also, the first electrode EL1 may have a multi-layer structure including a reflective film or semi-transmissive film made of the above-mentioned materials, and a transparent conductive film made of ITO (indium tin oxide), IZO (indium zinc oxide), ZnO (zinc oxide), ITZO (indium tin zinc oxide), etc. For example, the first electrode EL1 may be a multi-layer metal film, and may have a structure in which metal films of ITO / Ag / ITO are stacked.

[0063] The hole transport region HTR has a multi-layer structure having a single layer made of a single material, a single layer made of a plurality of different materials, or a plurality of layers made of a plurality of different materials. For example, the hole transport region HTR may have a single layer structure made of a plurality of different materials, or a structure of a hole injection layer HIL / hole transport layer HTL, a hole injection layer HIL / hole transport layer HTL / buffer layer (not shown), a hole injection layer HIL / buffer layer (not shown), a hole transport layer HTL / buffer layer (not shown), or a hole injection layer HIL / hole transport layer HTL / hole blocking layer (not shown) stacked in order from the first electrode EL1, but the embodiment is not limited thereto.

[0064] For example, the hole transport region HTR may include a hole injection layer HIL and a hole transport layer HTL, and the hole injection layer HIL and the hole transport layer HTL may be made of a known hole injection material and a known hole transport material, respectively.

[0065] The light-emitting layer EML is provided on the hole-transporting region HTR. The light-emitting layer EML has a multilayer structure having a single layer of a single material, a single layer of multiple different materials, or multiple layers of multiple different materials.

[0066] The emitting layer EML emits a first color light. For example, the emitting layer EML is made of an organic material that emits green light and includes a fluorescent material or a phosphorescent material. The emitting layer EML also includes a host and a dopant. The dopant includes at least one of a phosphorescent dopant, a fluorescent dopant, or a thermally activated delayed fluorescence dopant. For example, the emitting layer EML may include any one of a phosphorescent dopant, a fluorescent dopant, or a thermally activated delayed fluorescence dopant as a dopant, or may include a thermally activated delayed fluorescence dopant as a first dopant and a fluorescent dopant as a second dopant. Preferably, the emitting layer EML includes a phosphorescent dopant. That is, the emitting layer EML emits phosphorescence.

[0067] If the emitting layer EML emits green light, the emitting layer EML is, for example, Alq 3 When the light emitting layer emits green light, the dopant contained in the light emitting layer EML is, for example, Ir(ppy). 3 The metal complex or organometallic complex is selected from the group consisting of Ir, Pt, Os, Au, Cu, Re, and Ru. For example, PQIr (iridium(III) bis(2-phenylquinolyl-N,C) 2' ) acetylacetonate, Ir(ppy) 3 (fac-tris(2-phenylpyridine)iridium), or at least one compound selected from the following first compound group:

[0068] [First compound group] TIFF0007619764000002.tif100170

[0069] However, this is merely an exemplary description, and the emissive layer EML may include, without limitation, any green phosphorescent emissive material known in the art.

[0070] 6a and 6b, the light emitting layer EML includes an organic material, but the embodiment is not limited thereto, and the light emitting layer EML may be a quantum dot light emitting layer including quantum dots as a light emitting material. If the light emitting layer EML includes quantum dots as a light emitting material, the quantum dots are substantially the same as those described below with respect to quantum dots QD2.

[0071] The electron transport region ETR is provided above the light emitting layer EML and may include, but is not limited to, at least one of a hole blocking layer (not shown), an electron transport layer ETL, and an electron injection layer EIL.

[0072] When the electron transport region ETR includes an electron injection layer EIL and an electron transport layer ETL, a known electron injection material and a known electron transport material are used for the electron injection layer EIL and the electron transport layer ETL, respectively.

[0073] The second electrode EL2 is provided on the electron transport region ETR. The second electrode EL2 is a common electrode or a cathode. The second electrode EL2 is made of a metal alloy or a conductive compound. The second electrode EL2 is a transmissive electrode, a semi-transmissive electrode, or a reflective electrode. If the second electrode EL2 is a transmissive electrode, the second electrode EL2 is made of a transparent metal oxide, such as ITO, IZO, ZnO, ITZO, etc.

[0074] If the second electrode EL2 is a semi-transmissive electrode or a reflective electrode, the second electrode EL2 contains Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF / Ca, LiF / Al, Mo, Ti, or a compound or mixture thereof (e.g., a mixture of Ag and Mg).The second electrode EL2 may have a multi-layer structure including a reflective film or semi-transmissive film made of the above-mentioned materials and a transparent conductive film made of ITO, IZO, ZnO, ITZO, or the like.

[0075] Meanwhile, although not shown, the second electrode EL2 is connected to an auxiliary electrode, If the second electrode EL2 is connected to the auxiliary electrode, the resistance of the second electrode EL2 can be reduced.

[0076] In the display panel DP according to the embodiment, the first electrode EL1 of the first electrode EL1 and the second electrode EL2 facing each other are a reflective electrode and the second electrode EL2 is a transmissive electrode. In the embodiment, the light emitting element LD emits light from the front. However, the embodiment is not limited thereto.

[0077] Although not shown, a capping layer (not shown) is further disposed on the second electrode EL2. The capping layer is a layer for adjusting the resonance distance of light emitted from the light emitting layer EML or adjusting optical properties of the light emitting element LD, such as the refractive index.

[0078] 5, the hole transport region HTR, the light emitting layer EML, and the electron transport region ETR constituting the light emitting unit EM are provided as a common layer for the entire light emitting element LD adjacent to each other. Unlike the configuration in which the first electrodes EL1 are provided by patterning the first electrodes EL1 on the circuit layer CL while being spaced apart from each other, the hole transport region HTR, the light emitting layer EML, and the electron transport region ETR are each disposed extending over the entire light emitting element layer LDL without being patterned.

[0079] The thin-film encapsulation layer TFE is disposed on the second electrode EL2. The thin-film encapsulation layer TFE is disposed directly on the second electrode EL2. If the light-emitting element LD further includes a capping layer (not shown), the thin-film encapsulation layer TFE is disposed directly on the capping layer (not shown).

[0080] A light control layer WCL is disposed on the thin-film encapsulation layer TFE. The light control layer WCL includes a first light control unit WCL1, a second light control unit WCL2, a third light control unit WCL3, and a partition unit BK. The partition units BK are disposed on the base substrate BS and spaced apart from each other. The partition units BK are disposed in one-to-one correspondence with the positions of the pixel definition layer PDL. The partition units BK are disposed between the first to third light control units WCL1, WCL2, and WCL3 to prevent the light emitted from the first to third light control units WCL1, WCL2, and WCL3 from being mixed.

[0081] The first to third light control units WCL1, WCL2, and WCL3 are disposed spaced apart from each other on a plane.

[0082] The light control layer WCL further includes a protective layer CAP. The protective layer CAP is disposed on the first to third light control units WCL1, WCL2, and WCL3 and the partition wall BK. The protective layer CAP serves to prevent the penetration of moisture and / or oxygen (hereinafter referred to as "moisture / oxygen"). The protective layer CAP is disposed on the first to third light control units WCL1, WCL2, and WCL3, and blocks the first to third light control units WCL1, WCL2, and WCL3 from being exposed to moisture / oxygen. The protective layer CAP includes at least one inorganic layer. That is, the protective layer CAP is formed including an inorganic material. For example, the protective layer CAP is formed including silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, and silicon oxynitride, or a metal thin film having a sufficient light transmittance. Meanwhile, the protective layer CAP may further include an organic film. The protective layer CAP may include a single layer or multiple layers.

[0083] 7a and 7b are enlarged cross-sectional views of the light control layers WCL and WCL-1 according to an embodiment, respectively. FIGs. 8a and 8b are schematic diagrams illustrating energy transfer between the first light emitter RM and the auxiliary light emitter included in the display device DD according to an embodiment.

[0084] Referring to Fig. 7a, the first light control unit WCL1 includes a first light emitter RM. The first light emitter RM emits a second color light having a shorter wavelength than the first color light. The first light emitter RM is an organic compound or a quantum dot. The first light control unit WCL1 further includes an auxiliary light emitting body.

[0085] In particular, if the first light emitter RM is an organic compound, the first light controller WCL1 further includes an auxiliary light emitter, which is excited by absorbing the first color light and transfers energy to the first light emitter RM.

[0086] Referring to FIG. 8a, the first luminescent body RM and the auxiliary luminescent body exchange energy with each other by a Dexter energy transfer method.

[0087] In this specification, S 0 R means the energy level of the bottom state of the luminescent support, and S 0 B means the bottom state energy level of the first emitter RM. T 1 R means the lowest triplet energy level of the luminescent support, and T 1 B means the lowest triplet energy level of the first emitter RM. S 1 B means the lowest singlet energy level of the first emitter RM. In this specification, the lowest triplet energy level (T 1 B ) is called the first lowest triplet energy level, and the lowest triplet energy level of the luminescent support (T 1 R ) is called the second lowest triplet energy level.

[0088] The light-emitting auxiliary receives the first color light emitted from the light-emitting element LD, and 0 R The electron is T 1 R Next, the light-emitting support T 1 R The electron of the first emitter RM is T1 B Go to the first light source RM's S 0 B The electrons of the luminescent auxiliary S 0 R Go to.

[0089] Referring to FIG. 8b, triplet-triplet annihilation (hereinafter, TTA) occurs from the first emitter RM, and one S 1 B Generates electrons. S 1 B As the electron falls to the bottom state, it emits a second color of light having a shorter wavelength than the first color of light, for example blue light having a shorter wavelength than green light.

[0090] The lowest triplet energy level of the first emitter RM (T 1 B ) is greater than 1.2 eV and the lowest triplet energy level of the luminescent support (T 1 R ) is smaller than the lowest singlet energy level (S 1 B ) is approximately 2.5 eV or more and 3.1 eV or less. The first emitter RM is a blue fluorescent emitting material.

[0091] The lowest triplet energy level of the luminescent support (T 1 R The lowest triplet energy level of the luminescent support (T 1 R ) is 2.5 eV or less, the green light emitted from the light-emitting element is absorbed, and the bottom-state electrons rise to the lowest triplet energy level (T 1 R ) or excited to the lowest singlet energy level.

[0092] The lowest triplet energy level of the first emitter RM (T 1 B ) is the lowest triplet energy level of the luminescent support (T 1 R ) is smaller than the T 1R The electron is T of the first emitter RM 1 B Go to.

[0093] The lowest triplet energy level of the first emitter RM (T 1 B ) is greater than 1.2 eV, triplet-triplet annihilation occurs to produce a singlet with an energy level between 2.7 eV and 3.0 eV, thus enabling blue light emission.

[0094] The first light control unit WCL1 includes the first light emitter RM and the light-emitting assistant in a state where they are dispersed in a matrix unit MX. For example, the first light control unit WCL1 may include the first light emitter RM and the light-emitting assistant in a fill state mixed with a polymer resin such as PMMA [poly(methyl methacrylate)]. However, the embodiment is not limited thereto, and the matrix unit MX may be an organic compound instead of a polymer resin. For example, the first light control unit WCL1 may include the first light emitter RM and the light-emitting assistant in a gelled state mixed with an organic compound such as 1,2-dichloroethane.

[0095] If the matrix portion MX is a polymer resin, substantially the same explanation as for the base resin BR in the first light control portion WCL1 and the second light control portion WCL2 described later is applied.

[0096] In the total weight of the first light emitter RM and the auxiliary light emitter, the first light emitter RM has a ratio of about 70 wt% to 90 wt%, and the auxiliary light emitter has a ratio of about 1 wt% to 30 wt%. If the ratio of the first light emitter RM and the auxiliary light emitter satisfies the above range, the first light controller WCL1 achieves a satisfactory light conversion efficiency.

[0097] That is, the first emitter RM is a blue fluorescent material, For example, the first emitter RM is an anthracene derivative, a pyrene derivative, a fluoranthene derivative, a chrysene derivative, a dihydrobenzanthracene derivative, or a triphenylene derivative.

[0098] When the first light emitter RM is an anthracene derivative, for example, the anthracene derivative is represented by the following chemical formula 1. TIFF0007619764000003.tif59170In chemical formula 1, R 1 ~R 10 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted silyl group, a substituted or unsubstituted alkyl group having from 1 to 50 carbon atoms, a substituted or unsubstituted aryl group having from 6 to 50 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having from 2 to 50 ring carbon atoms, or are bonded to an adjacent group to form a ring.

[0099] In this specification, "adjacent groups bond together to form a ring" means adjacent groups bond together to form a substituted or unsubstituted hydrocarbon ring, or a substituted or unsubstituted hetero ring. The hydrocarbon ring includes an aliphatic hydrocarbon ring and an aromatic hydrocarbon ring. The hetero ring includes an aliphatic hetero ring and an aromatic hetero ring. The hydrocarbon ring and the hetero ring are monocyclic or polycyclic. In addition, the ring formed by bonding together may be linked to another ring to form a spiro structure.

[0100] The substituted or unsubstituted alkyl group having 1 to 50 carbon atoms includes a urethane group, an amide group, an alkoxy group, and the like.

[0101] In Chemical Formula 1, a and b are each independently an integer of 0 to 5. When a is 2 or more, R 9 and R 10 each independently bonds to an adjacent group to form a ring.

[0102] When the first light emitter RM is a pyrene derivative, for example, the pyrene derivative is represented by the following chemical formula 2. TIFF0007619764000004.tif25170In chemical formula 2, R 20is a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted silyl group, a substituted or unsubstituted alkyl group having from 1 to 50 carbon atoms, a substituted or unsubstituted aryl group having from 6 to 50 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having from 2 to 50 ring carbon atoms, or is bonded to an adjacent group to form a ring.

[0103] c is between 1 and 10. If c is 2 or more, R 20 may be the same or different. 20 At least one of R is not hydrogen. 20 R includes an amine group, such as, for example, an arylamine group. 20 is a substituted or unsubstituted arylene group.

[0104] In one embodiment, the luminescence assisting substance is at least one of a fluorescent luminescent material, a phosphorescent luminescent material, or a thermally activated delayed fluorescent luminescent material.

[0105] Preferably, the light-emitting auxiliary is a phosphorescent material or a thermally activated delayed fluorescent material. When the light-emitting auxiliary is a phosphorescent material or a thermally activated delayed fluorescent material, the electrons excited to the lowest singlet energy level by the first color light are excited to the lowest triplet energy level (T 1 R ) occurs. Therefore, all of the excited electrons can be used to transfer energy to the first emitter RM, enabling highly efficient light emission.

[0106] For example, the light-emitting auxiliary is an organometallic complex that emits red light. The metal of the organometallic complex is selected from the group consisting of Ir, Pt, Os, Au, Cu, Re, and Ru. More specifically, the light-emitting auxiliary is a porphyrin derivative. More specifically, the light-emitting auxiliary is a porphyrin-metal complex.

[0107] 7b, in one embodiment of the display device DD, the first light controller WCL1a includes a quantum dot QD1 as a first light emitter RM, the core of the quantum dot QD1 being selected from a II-VI group compound, a III-V group compound, a IV-VI group compound, a group IV element, a group IV compound, and combinations thereof.

[0108] The II-VI compounds include binary compounds selected from the group consisting of CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS, and mixtures thereof, AgInS, CuInS, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HeSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, Cd ternary compounds selected from the group consisting of HgZnTe, HgZnS, HeZnSe, HeZnTe, MgZnSe, MgZnS, and mixtures thereof, and quaternary compounds selected from the group consisting of HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe, and mixtures thereof.

[0109] The III-V compound is selected from the group consisting of binary compounds selected from the group consisting of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, and mixtures thereof; ternary compounds selected from the group consisting of GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InGaP, InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP, and mixtures thereof; and quaternary compounds selected from the group consisting of GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, and mixtures thereof.

[0110] The IV-VI compound is selected from the group consisting of binary compounds selected from the group consisting of SnS, SnSe, SnTe, PbS, PbSe, PbTe, and mixtures thereof, ternary compounds selected from the group consisting of SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, and mixtures thereof, and quaternary compounds selected from the group consisting of SnPbSSe, SnPbSeTe, SnPbSTe, and mixtures thereof. The group IV element is selected from the group consisting of Si, Ge, and mixtures thereof. The group IV element is a binary compound selected from the group consisting of SiC, SiGe, and mixtures thereof.

[0111] In this case, the binary, ternary, or quaternary compounds may be present in the particle with a uniform concentration, or may be present in the same particle with partially different concentration distributions. Also, one quantum dot QD1 may have a core / shell structure in which one quantum dot QD1 surrounds another quantum dot QD1. The interface between the core and the shell has a concentration gradient in which the concentration of the element present in the shell decreases toward the center.

[0112] In some embodiments, the QD has a core-shell structure including a core containing the nanocrystals described above and a shell surrounding the core. The shell of the QD1 acts as a protective layer to prevent chemical denaturation of the core and maintain the semiconductor properties, and / or acts as a charging layer to give the QD1 electrophoretic properties. The shell is a single layer or multiple layers. The interface between the core and the shell has a concentration gradient in which the concentration of the elements present in the shell decreases toward the center. Examples of the shell of the QD1 include metal or nonmetal oxides, semiconductor compounds, or combinations thereof.

[0113] For example, the metal or nonmetal oxide is SiO 2 , Al 2 O 3 , TiO 2 , ZnO, MnO, Mn 2 O3 , Mn 3 O 4 , CuO, FeO, Fe 2 O 3 , Fe 3 O 4 , CoO, Co 3 O 4 , binary compounds such as NiO, or MgAl 2 O 4 , CoFe 2 O 4 , NiFe 2 O 4 , CoMn 2 O 4 However, the present invention is not limited thereto.

[0114] Examples of the semiconductor compound include CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnSeS, ZnTeS, GaAs, GaP, GaSb, HgS, HgSe, HgTe, InAs, InP, InGaP, InSb, AlAs, AlP, and AlSb, but the present invention is not limited to these.

[0115] The quantum dot QD1 has a full width of half maximum (FWHM) of the emission wavelength spectrum of about 45 nm or less, preferably about 40 nm or less, more preferably about 30 nm or less, and improves color purity and color reproducibility within this range. In addition, since the light emitted through such quantum dot QD1 is emitted in all directions, the light viewing angle is improved.

[0116] The shape of the quantum dot QD1 is not particularly limited and may be any shape commonly used in the art. More specifically, the shape of the quantum dot QD1 may be a spherical, pyramidal, multi-arm, or cubic nanoparticle, nanotube, nanowire, nanofiber, or nanoplate-like particle. For example, the quantum dot QD1 may be a rod-shaped quantum rod. The quantum dot QD1 adjusts the color of the light emitted according to the size of the particle, and thus the quantum dot QD1 has various emission colors such as blue, red, and green. Depending on the material and shape of the quantum dot QD1, the quantum dot QD1 absorbs light in a first wavelength region and emits light in a wavelength region shorter than the light in the first wavelength region.

[0117] For example, if the core of the quantum dot QD1 includes a plurality of different compounds, each of the portions of the core of the quantum dot QD1 that include different compounds has two different band gap energies (the difference between the maximum conduction band energy level and the highest valence band energy level). For example, the quantum dot QD1 includes a first portion made of a first compound having a first band gap and a second portion made of a second compound having a second band gap. At this time, excitons excited in the lowest conduction band of the first band gap fall to the highest valence band energy of the second band gap, which has energy lower than the highest valence band energy of the first band gap. Therefore, the quantum dot QD1 of one embodiment absorbs light in a first wavelength region and emits light in a wavelength region shorter than the light in the first wavelength region.

[0118] The first light control unit WCL1 further includes a base resin BR and scattering particles SC in addition to the quantum dots QD1. The quantum dots QD1 and scattering particles SC are uniformly or non-uniformly dispersed in the base resin BS. The scattering particles SC scatter the light emitted from the quantum dots QD1 to improve the light viewing angle.

[0119] The base resin BS is a medium in which the quantum dots QD1, QD2 or scattering particles SP are dispersed, and is generally made of various resin compositions called binders. The base resin BS is made of a polymer resin composition. For example, the polymer resin composition forming the base resin BS may include an acrylic resin, a urethane resin, a silicone resin, an epoxy resin, etc. The polymer resin composition is transparent.

[0120] The scattering particles SC are inorganic particles. For example, the scattering particles SC are TiO 2 , ZnO, Al 2 O 3 , SiO 2 The scattering particles SC may include at least one of TiO 2 , ZnO, Al 2 O 3 , SiO 2 or hollow silica, or TiO 2 , ZnO, Al 2 O 3 , SiO 2 and hollow silica.

[0121] The second light controller WCL2 transmits the first color light emitted from the light emitting element LD. For example, the second light controller WCL2 may transmit the green light emitted from the light emitting element LD. The second light controller WCL2 includes a base resin BR and scattering particles SC. The second light controller WCL2 does not include a separate light emitting body. Therefore, the density of the scattering particles SC in the second light controller WCL2 is higher than the density of the scattering particles SC in the first light controller WCL1 and the third light controller WCL3.

[0122] The third light controller WCL3 includes a second light emitter that emits a third color light. The second light emitter absorbs the first color light emitted from the light emitting element LD and emits a third color light having a longer wavelength than the first color light. The second light emitter, for example, absorbs the green light emitted from the light emitting element and emits red light. The second light emitter is, for example, a quantum dot QD2. If the second light emitter is a quantum dot QD2, the same content as that regarding the quantum dot QD1 described for the first light emitter RM is applied, except that the quantum dot QD2 absorbs a short wavelength and emits a long wavelength.

[0123] In the display device DD of the embodiment, the first light controller WCL1 includes a nanocrystal compound in addition to an organic compound or quantum dots. The nanocrystal compound is perovskite. In this case, the first to third light controllers WCL1, WCL2, and WCL3 absorb the first color light and emit light with a shorter wavelength than the first color light. For example, the first light controller WCL1 may absorb the first color light and emit blue light, the second light controller WCL2 may absorb the first color light and emit green light, and the third light controller WCL3 may absorb the first color light and emit red light. The first color light is infrared light. However, the embodiment is not limited to the above.

[0124] Fig. 9 is a cross-sectional view of a display panel DP-1 according to an embodiment. Fig. 10 is a cross-sectional view of a light emitting device LD-1 according to an embodiment. Referring to Figs. 9 and 10, the light emitting device LD-1 includes a plurality of light emitting units EM1, EM2, EM3. The plurality of light emitting units EM1, EM2, EM3 are stacked in sequence. For the light emitting units EM1, EM2, EM3, substantially the same content as that for the light emitting unit EM described in Fig. 5 etc. is applied. When a plurality of light emitting units EM1, EM2, EM3 are included, higher brightness and longer life are achieved than when one light emitting unit EM is included.

[0125] 9, the display panel DP according to the embodiment includes three stacked light emitting units EM1, EM2, and EM3, but the embodiment is not limited thereto. For example, two light emitting units may be stacked, or four or more light emitting units may be stacked. Preferably, three or four light emitting units are stacked. If five or more light emitting units are stacked, the driving voltage of the light emitting element LD-1 may become high.

[0126] A charge generation layer CGL is disposed between the light emitting units EM1, EM2, and EM3. When a voltage is applied to the charge generation layer CGL, charges are generated. The charge generation layer CGL is disposed between the adjacent light emitting units EM1, EM2, and EM3, and serves to adjust the charge balance between the light emitting units EM1, EM2, and EM3. For example, the charge generation layer CGL serves to assist in the injection of electrons into the first light emitting unit EM1 and the injection of holes into the second light emitting unit EM2.

[0127] The charge generation layer CGL may be a single layer in which an electron injection material and a hole injection material are mixed. Alternatively, the charge generation layer CGL may be two or more layers. For example, the charge generation layer CGL may include an n-type charge generation layer doped with an N-type dopant and a p-type charge generation layer doped with a P-type dopant. The n-type charge generation layer is disposed directly above or adjacent to the electron transport region ETR to assist injecting electrons, and the p-type charge generation layer is disposed directly below or adjacent to the hole transport region HTR to assist injecting holes.

[0128] The material of the charge generation layer CGL is not particularly limited, and any material known in the art may be used without limitation. Meanwhile, in one embodiment, the charge generation layer CGL may be omitted.

[0129] 11 and 12 are cross-sectional views of display panels DP-2 and DP-3 according to an embodiment, respectively. Referring to FIG. 11, the display panel DP-2 further includes a color filter layer CFL. The color filter layer CFL is disposed on the light control layer WCL. The color filter layer CFL includes a first color filter CF1, a second color filter CF2, and a third color filter CF3. The first to third color filters CF1, CF2, and CF3 are disposed spaced apart from each other. A light-shielding layer BM is disposed between the first to third color filters CF1, CF2, and CF3. The light-shielding layer BM is disposed directly under the second base layer BS2. The light-shielding layer BM overlaps the non-light-emitting area NPXA on a plane. The light-shielding layer BM includes carbon black particles. The light-shielding layer BM is disposed to prevent the phenomenon of light emitted from adjacent light-emitting areas being mixed. In an embodiment, the light-shielding layer BM may be omitted.

[0130] The first color filter CF1 overlaps with the first light controller WCL1, the second color filter CF2 overlaps with the second light controller WCL2, and the third color filter CF3 overlaps with the third light controller WCL3. The first to third color filters CF1, CF2, and CF3 transmit different wavelengths. For example, the first color filter CF1 may transmit the second color light and absorb the remaining light, the second color filter CF2 may transmit the first color light and absorb the remaining light, and the third color filter CF3 may transmit the third color light and absorb the remaining light.

[0131] The first to third color filters CF1, CF2, and CF3 transmit color light corresponding to the light emitted by the first to third light controllers WCL1, WCL2, and WCL3, respectively, and absorb the remaining light. The first color filter CF1 is a blue color filter that transmits blue light, the second color filter CF2 is a green color filter that transmits green light, and the third color filter CF3 is a red color filter that transmits red light.

[0132] The first, second, and third color filters CF1, CF2, and CF3 each include a base resin and at least one dye or pigment dispersed in the base resin. The first, second, and third color filters CF1, CF2, and CF3 each include different types of dyes and pigments. For example, the first color filter CF1 may include at least one blue dye or blue pigment, the second color filter CF2 may include at least one green dye or green pigment, and the third color filter CF3 may include at least one red dye or red pigment.

[0133] By disposing the first to third color filters CF1, CF2, and CF3, only light in a target wavelength region is emitted, improving the color reproducibility of the display device DD-2. Also, the visibility of the display device DD-2 is improved by absorbing the light incident from the outside and reducing the reflection of external light.

[0134] Referring to Fig. 12, the display panel DP-3 further includes a polarizing layer POL. The polarizing layer POL blocks a portion of external light. The polarizing layer POL has an anti-reflection function that minimizes reflection caused by external light. Therefore, the visibility of the display device DD-3 is improved. The polarizing layer POL includes a circular polarizer or a linear polarizer and a λ / 4 phase retarder.

[0135] The display of the embodiment includes a light emitting element layer LDL that emits a first color light, and a light control layer WCL disposed on the light emitting element layer LDL. The light control layer WCL includes a first light control unit WCL1 that emits a second color light in a wavelength range shorter than the first color light, a second light control unit WCL2 that transmits the first color light, and a third light control unit WCL3 that emits a third color light in a wavelength range longer than the first color light. That is, the display device DD of the embodiment includes both a first light control unit WCL1 that converts (Up-Conversion) light provided from the light source into light with a shorter wavelength than the light provided from the light source, and a third light control unit WCL3 that converts (Down-Conversion) light provided from the light source into light with a longer wavelength than the light provided from the light source, on the light emitting element layer LDL that serves as a light source. As a result, the display device DD of the embodiment effectively converts the light provided from the light source, and exhibits improved life characteristics and high luminous efficiency characteristics. Therefore, the display DD of the embodiment achieves a long life and high luminous efficiency.

[0136] Although the present invention has been described with reference to the embodiments, it should be understood that those skilled in the art can modify and change the present invention in various ways without departing from the spirit and scope of the present invention described in the following claims. In addition, the disclosed embodiments of the present invention are not intended to limit the technical idea of ​​the present invention, and all technical ideas within the scope of the following claims and their equivalents should be interpreted as being included in the scope of the present invention. [Explanation of symbols]

[0137] DD: Display device DP: Display panel LDL: Light emitting device layer LD: Light emitting device EM: Light emitting part WCL: Light control layer CFL: Color filter layer

Claims

1. an organic light-emitting element layer that emits green light; a light control layer disposed on the organic light emitting device layer; The light control layer is A first light control unit including a first light emitter that emits blue light in a wavelength region shorter than that of the green light, and a light-emitting auxiliary body that absorbs the green light, is excited, and transfers energy to the first light emitter; A second light control unit that transmits the green light and does not include a light emitter; a third light control unit including a second light emitter that emits red light having a wavelength longer than that of the green light, The first, second and third light control units are spaced apart from each other on a plane, the first luminescent material is an anthracene derivative; A display device comprising: a display device in which the auxiliary light emitting body has a ratio of 1 wt % to 30 wt % of the total weight of the first light emitting body and the auxiliary light emitting body.

2. The green light has a central wavelength of 500 nm or more and 580 nm or less, The blue light has a central wavelength of 420 nm or more and 480 nm or less, The display device according to claim 1 , wherein the red light has a central wavelength of 600 nm or more and 670 nm or less.

3. The first lowest triplet energy level of the first luminescent material is greater than 1.2 eV and less than the second lowest triplet energy level of the auxiliary luminescent material; The display device according to claim 1 , wherein the second lowest triplet energy level is 2.5 eV or less.

4. The display device according to claim 3 , wherein the lowest singlet energy level of the first luminescent material is not less than 2.5 eV and not more than 3.1 eV.

5. the first luminescent material is a fluorescent luminescent material; 4. The display device according to claim 3, wherein the light-emitting auxiliary substance is a phosphorescent material or a thermally activated delayed fluorescent material.

6. the first luminescent material is an anthracene derivative; 2. The display device according to claim 1, wherein the light-emission auxiliary is a porphyrin-metal complex.

7. The display device according to claim 1 , wherein the second light emitter is a quantum dot.

8. Further comprising a color filter layer disposed on the light control layer; The color filter layer is a first color filter that is overlapped with the first light control unit and transmits the blue light; a second color filter that is overlapped with the second light control unit and transmits the green light; The display device according to claim 1 , further comprising: a third color filter overlapping the third light control unit and transmitting the red light.

9. the organic light-emitting device layer includes a light-emitting device, The light emitting element includes a first electrode, a second electrode, and at least one light emitting portion disposed between the first electrode and the second electrode, The at least one light emitting unit is a hole transport region; and a light-emitting layer disposed over the hole transport region; an electron transport region disposed over the light emitting layer; The display device according to claim 1 .

10. The light-emitting layer comprises a host and a dopant, The display device of claim 9 , wherein the dopant comprises at least one of a phosphorescent dopant, a fluorescent dopant, or a thermally activated delayed fluorescent dopant.

11. The display device according to claim 9 , wherein the light-emitting layer emits phosphorescence.

12. The at least one light emitting unit includes a plurality of light emitting units sequentially stacked, The display device of claim 9, wherein the light emitting device comprises a charge generating layer disposed between the plurality of light emitting portions.

13. a display panel including a display area including a blue light-emitting area, a green light-emitting area, and a red light-emitting area, and a non-display area adjacent to the display area; The display panel includes: an organic light-emitting element layer that emits green light; a light control layer disposed on the organic light emitting device layer; The light control layer is a first light control unit including a first light emitter overlapping the blue light emission region, absorbing the green light and emitting blue light, and an auxiliary light emitter absorbing the green light, becoming excited, and transferring energy to the first light emitter; a second light control unit that overlaps the green light emitting region, transmits the green light, and does not include a light emitting body; a third light control unit overlapping the red light emitting region and absorbing the green light and emitting red light; the first luminescent material is an anthracene derivative; A display device comprising: a display device in which the auxiliary light emitting body has a ratio of 1 wt % to 30 wt % of the total weight of the first light emitting body and the auxiliary light emitting body.

14. The first lowest triplet energy level of the first luminescent material is greater than 1.2 eV and less than the second lowest triplet energy level of the auxiliary luminescent material; The display device according to claim 13, wherein the second lowest triplet energy level of the auxiliary light-emitting substance is 2.5 eV or less.

15. an organic light-emitting device layer including a plurality of light-emitting devices; a light control layer disposed on the organic light emitting device layer; Each of the plurality of light emitting elements is A first electrode; A second electrode disposed on the first electrode; at least one light emitting portion disposed between the first electrode and the second electrode; The at least one light emitting unit is a hole transport region; and a light-emitting layer disposed over the hole transport region and emitting green light; an electron transport region disposed over the light emitting layer; The light control layer is a first light control unit including a first light emitter that absorbs the green light and emits blue light, and a light-emitting auxiliary body that absorbs the green light, is excited, and transfers energy to the first light emitter; A second light control unit that transmits the green light and does not include a light emitter; a third light control unit that absorbs the green light and emits red light; the first luminescent material is an anthracene derivative; A display device comprising: a display device in which the auxiliary light emitting body has a ratio of 1 wt % to 30 wt % of the total weight of the first light emitting body and the auxiliary light emitting body.

16. The organic light-emitting element layer is A first light emitting unit; A second light emitting portion disposed on the first light emitting portion; The display device of claim 15 , further comprising: a charge generation layer disposed between the first light emitter and the second light emitter.

17. the first lowest triplet energy level of the first emitter is greater than 1.2 eV; 16. The display device according to claim 15, wherein the second lowest triplet energy level of the auxiliary light-emitting substance is higher than the first lowest triplet energy level of the first light-emitting substance by 2.5 eV or less.

18. The first illuminant is represented by the following Chemical Formula 1: In the above Chemical Formula 1, R １ ~R １０ each independently represents a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted silyl group, a substituted or unsubstituted alkyl group having from 1 to 50 carbon atoms, a substituted or unsubstituted aryl group having from 6 to 50 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having from 2 to 50 ring carbon atoms, or is bonded to an adjacent group to form a ring, 18. The display device according to claim 17, wherein a and b are each independently an integer of 0 or more and 5 or less.

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