Indication device

Abstract

To provide a higher luminance display device.SOLUTION: A display device comprises: a substrate containing first to third sub-pixels; a reflection electrode disposed to each of the first to third sub-pixels; a first electrode that is located on the reflection electrode, and is formed separately at each of the first to third sub-pixels; a first light emission part provided on the first electrode and containing any one of red, green, and blue light emission layers; a second light emission part provided on the first light emission part and containing a light emission layer different from the first light emission part; a third light emission part provided on the second light emission part and containing a light emission layer different from the first and second light emission parts; and a second electrode provided on the third light emission part. A blue light emission layer of any one of the first to third light emission parts is closer to the first electrode than a red light emission layer of any one of the first to third light emission parts. A light emission layer with a distance between the first electrode and the second electrode of 310 nm and in the third light emission part is the red light emission layer, or a light emission layer with a distance between the first electrode and the second electrode of 385 nm, and in the third light emission part is the red light emission layer, or a light emission layer with a distance between the first electrode and the second electrode of 450 nm, and in the third light emission part is a green light emission layer.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present specification relates to a display device. [Background technology]

[0002] Display devices are embodied in a wide variety of forms, including televisions, monitors, smartphones, tablet PCs, notebooks, and wearable devices. Devices worn by viewers to display images can include a display device within a device worn on the viewer's head. Because the display device is configured to be in close contact with the viewer, the area in which the display device can be placed is limited, and a clear display with high resolution within the limited placement area is required. Therefore, the display device requires high integration of elements and high brightness characteristics. Summary of the Invention [Problem to be solved by the invention]

[0003] Therefore, the inventors of the present specification have recognized the above problems and conducted several experiments to realize a display device capable of improving brightness. Through these experiments, they have invented a display device with a new structure capable of realizing high brightness.

[0004] The problem to be solved by the embodiments of the present specification is to provide a display device having high brightness.

[0005] The problems to be solved by the embodiments of the present specification are not limited to the problems described above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0006] A display device according to an embodiment of the present specification includes a substrate including first to third subpixels, a first electrode in each of the first to third subpixels, a first light-emitting section on the first electrode and including a first light-emitting layer, a second light-emitting section on the first light-emitting section and including a second light-emitting layer, a third light-emitting section on the second light-emitting section and including a third light-emitting layer, and a second electrode on the third light-emitting section, wherein the first to third light-emitting layers emit light of different colors, and the distance between the first electrode and the second electrode can be 310 nm to 450 nm.

[0007] A display device according to an embodiment of the present specification includes a substrate including first to third subpixels, reflective electrodes in each of the first to third subpixels, a first electrode on the reflective electrode, a first light-emitting section on the first electrode and including one of a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer, a second light-emitting section on the first light-emitting section and including a light-emitting layer different from that of the first light-emitting section, a third light-emitting section on the second light-emitting section and including a light-emitting layer different from that of the first light-emitting section and the second light-emitting section, and a second electrode on the third light-emitting section, wherein the blue light-emitting layer of one of the first to third light-emitting sections is disposed closer to the first electrode than the red light-emitting layer of one of the first to third light-emitting sections, and the distance between the first electrode and the second electrode may be 310 nm to 450 nm.

[0008] A display device according to an embodiment of the present specification includes a substrate including first to third subpixels, reflective electrodes in each of the first to third subpixels, a first electrode on the reflective electrode, a first light-emitting section on the first electrode and including one of a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer, a second light-emitting section on the first light-emitting section and including a light-emitting layer different from that of the first light-emitting section, a third light-emitting section on the second light-emitting section and including a light-emitting layer different from that of the first light-emitting section and the second light-emitting section, and a second electrode on the third light-emitting section, wherein the red light-emitting layer in one of the first to third light-emitting sections is disposed closer to the first electrode than the blue light-emitting layer in one of the first to third light-emitting sections, and the distance between the first electrode and the second electrode may be 310 nm to 450 nm.

[0009] A display device according to an embodiment of the present specification includes a substrate including first to third subpixels, a reflective electrode in each of the first to third subpixels, a first electrode on the reflective electrode, first to third light-emitting sections on the first electrode, and a second electrode on the third light-emitting section, wherein the first to third light-emitting sections on the first light-emitting section each include one of a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer, and the red light-emitting layer and the green light-emitting layer are arranged with a light-emitting section including a blue light-emitting layer between them, and the distance between the first electrode and the second electrode may be 310 nm to 385 nm.

[0010] Other embodiment details are included in the detailed description and drawings. [Effects of the Invention]

[0011] The display device according to the embodiments of the present specification is configured with three light emitting units, and therefore, it is possible to provide a display panel or a display device including light emitting elements with improved brightness and efficiency.

[0012] According to the embodiments of the present specification, the position of the light-emitting layer can be configured by the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode, and a display device including a display panel or a light-emitting element with improved brightness and efficiency can be provided.

[0013] In addition to the advantages of the present application described above, other features and advantages of the present application will be described below or will be apparent to those skilled in the art from such descriptions and techniques.

[0014] The content of the invention described above in the problem to be solved, means for solving the problem, and effects do not specify essential features of the claims, and therefore the scope of the claims is not limited by the matters described in the content of the invention. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a diagram showing a display device according to an embodiment of the present specification; [Figure 2A]FIG. 10 shows a contour map according to an example of the present specification. [Figure 2B] FIG. 10 shows a contour map according to an example of the present specification. [Figure 2C] FIG. 10 shows a contour map according to an example of the present specification. [Figure 3A] FIG. 10 shows a contour map according to an example of the present specification. [Figure 3B] FIG. 10 shows a contour map according to an example of the present specification. [Figure 3C] FIG. 10 shows a contour map according to an example of the present specification. [Figure 4A] FIG. 10 shows a contour map according to an example of the present specification. [Figure 4B] FIG. 10 shows a contour map according to an example of the present specification. [Figure 4C] FIG. 10 shows a contour map according to an example of the present specification. [Figure 5] 1A and 1B are diagrams illustrating a display panel according to an embodiment of the present specification. [Figure 6] FIG. 10 is a diagram showing a display panel according to another embodiment of the present specification. [Figure 7] FIG. 10 is a diagram showing a display panel according to another embodiment of the present specification. [Figure 8] FIG. 10 is a diagram showing a display panel according to another embodiment of the present specification. [Figure 9] FIG. 10 is a diagram showing a display panel according to another embodiment of the present specification. [Figure 10] FIG. 10 is a diagram showing a display panel according to another embodiment of the present specification. [Figure 11] FIG. 10 is a diagram showing a display panel according to another embodiment of the present specification. [Figure 12] FIG. 1 shows an emission spectrum according to an example of the present specification. [Figure 13] FIG. 1 shows an emission spectrum according to an example of the present specification. [Figure 14] FIG. 1 shows an emission spectrum according to an example of the present specification. [Figure 15]FIG. 10 is a perspective view of a display device according to another embodiment of the present specification. [Figure 16] FIG. 10 is a top view of a display device according to another embodiment of the present specification. [Figure 17] FIG. 10 is a perspective view of a display device according to another embodiment of the present specification. [Figure 18] 18 is a diagram showing the relationship between the display device of FIG. 17 and the viewer's eyes. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] The advantages and features of the present specification, and methods for achieving them, will become clearer with reference to the following detailed description of the embodiments along with the accompanying drawings. However, the present specification is not limited to the embodiments disclosed below, and may be realized in various different forms. The embodiments are provided solely to complete the disclosure of the specification and to fully convey the scope of the invention to those skilled in the art to which the specification pertains. The specification is defined solely by the scope of the claims.

[0017] The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present application are merely examples and are not intended to limit the present invention to the details shown. The same reference numerals refer to the same components throughout the specification. Furthermore, in describing the present invention, if a detailed description of related publicly known technology is deemed to unnecessarily obscure the gist of the present invention, such a detailed description will be omitted.

[0018] When the terms "including," "having," "made," etc. are used herein, other parts may be added unless "only" is used. When an element is expressed in the singular, it also includes the plural unless otherwise expressly stated.

[0019] When interpreting elements, they are interpreted as including a margin of error even if there is no other explicit description.

[0020] When describing a location relationship, for example, when describing the location relationship of two parts using "above," "on top," "below," or "next to," one or more other parts may be located between the two parts, unless "immediately" or "directly" is used.

[0021] When describing a temporal relationship, for example, when a temporal precedence relationship is described using "after," "following," "next," or "before," it can also include cases where the relationship is not consecutive, unless "immediately" or "directly" is used.

[0022] Although terms such as "first" and "second" are used to describe various components, these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, a first component referred to below may be a second component within the technical concept of the present invention.

[0023] In describing components of the present application, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are used to distinguish the component from other components, and do not limit the nature, order, sequence, or number of the components. When a component is described as being "coupled," "coupled," or "connected" to another component, it should be understood that the component can be directly coupled or connected to the other component, but that other components can be "intervening" between the components that can be coupled or connected, unless otherwise explicitly stated.

[0024] The term "at least one" should be understood to include all possible combinations of one or more of the associated items. For example, "at least one of the first, second, and third items" can mean each of the first, second, and third items, as well as all possible combinations of items that can be presented in combinations of two or more of the first, second, and third items.

[0025] The features of the examples of this application may be partially or wholly combined or combined with each other, and may be technically interlocked and driven in various ways, and each example may be implemented independently of the other, or may be implemented together in association with the other.

[0026] Hereinafter, examples of display devices according to the present application will be described in detail with reference to the accompanying drawings. When assigning reference numerals to components in each drawing, identical components may have the same reference numerals as much as possible even if they are shown in different drawings. Furthermore, the scales of the components shown in the accompanying drawings may be different from the actual scales for the sake of convenience of explanation, and are not limited to the scales shown in the drawings.

[0027] FIG. 1 is a diagram showing a display device according to an embodiment of this specification.

[0028] According to the embodiments of the present specification, a display device may be configured with first to third light-emitting units. According to the experimental examples, a display device may be configured with a first light-emitting unit and a second light-emitting unit. According to the experimental examples, a display device may include one light-emitting layer in the first light-emitting unit and two light-emitting layers in the second light-emitting unit to realize white. When two light-emitting layers are configured in the second light-emitting unit, the two adjacent light-emitting layers share excitons with each other, resulting in different efficiencies of the light-emitting layers. It was recognized that increasing brightness is difficult due to the trade-off between the efficiencies of the two light-emitting layers. Therefore, the inventors of the present specification conducted various experiments to enhance brightness. Through these experiments, they invented a display device with a new structure in which the two light-emitting layers are separated and brightness can be improved depending on the light-emitting position of the light-emitting layers. This will be described below.

[0029] Referring to FIG. 1, a display device 10 according to an embodiment of the present specification may include a substrate 100, a first electrode 113, a light-emitting layer 123, 223, 323, and a second electrode 114.

[0030] The substrate 100 according to the embodiment of the present specification may include first to third sub-pixels (SP_R, SP_G, SP_B). For example, the substrate 100 may be at least one of a glass substrate, a plastic substrate, and a silicon wafer substrate. The substrate 100 according to the embodiment of the present specification may be a silicon wafer substrate. When configured as a silicon wafer substrate, a microcavity can be realized by the second electrode containing silver-magnesium, which is advantageous compared to a glass substrate, and ultra-high resolution can be realized. For example, when configured as a silicon wafer substrate, a strong cavity can be realized by the second electrode containing silver-magnesium. For example, compared to a display device (e.g., a TV display device) including three light-emitting units and using a glass substrate, a display device according to the embodiment of the present specification may realize ultra-high resolution and a strong microcavity.

[0031] For example, when the substrate 100 is disposed within a head-mounted display device, it may be made of a flexible material that has flexibility depending on the curvature of the housing of the head-mounted display device. As another example, when the substrate 100 is applied to a head-mounted display device that directly corresponds to both eyes and allows a viewer to view augmented reality images, the substrate 100 may be transparent. For example, the substrate 100 may be, but is not limited to, a transparent glass substrate or a projection plastic substrate. As another example, when the substrate 100 is applied to a head-mounted display device that directly corresponds to both eyes and allows a viewer to view virtual reality images, the substrate 100 may not be transparent, such as a silicon wafer substrate. Furthermore, when the substrate 100 is not directly disposed within the head-mounted display device but is disposed outside the eyes, the substrate 100 may not be transparent.

[0032] A thin film transistor may be disposed on the substrate 100. The thin film transistor may include a semiconductor layer, a gate electrode partially overlapping the semiconductor layer with a gate insulating film interposed therebetween, and a source electrode and a drain electrode connected to both sides of the semiconductor layer. The thin film transistor may have a top-gate structure in which the gate electrode is located above the semiconductor layer, but is not limited thereto. For example, the thin film transistor may have a bottom-gate structure in which the gate electrode is located below the semiconductor layer.

[0033] The semiconductor layer may be polysilicon, amorphous silicon, an oxide semiconductor layer, or a combination thereof. In another example, the semiconductor layer may be configured to include crystals only in a portion excluding the channel.

[0034] An interlayer insulating film may be further disposed on the gate insulating film to cover the gate electrode and correspond to the lower portions of the source and drain electrodes. An inorganic protective film and an organic protective film may be disposed on the interlayer insulating film to cover the source and drain electrodes.

[0035] The source electrode and the drain electrode may be connected to the underlying semiconductor layer through contact holes provided in the interlayer insulating film and the gate insulating film.

[0036] A reflective electrode may be disposed on each of the first to third sub-pixels (SP_R, SP_G, SP_B). For example, a 1-1 reflective electrode 110a may be disposed on the first sub-pixel (SP_R). A 1-2 reflective electrode 110b may be disposed on the second sub-pixel (SP_G). A 1-3 reflective electrode 110c may be disposed on the third sub-pixel (SP_B). For example, the 1-1 to 1-3 reflective electrodes 110a, 110b, 110c may be made of at least one of aluminum (Al), aluminum alloy, silver (Ag), silver alloy, APC alloy (an alloy of silver (Ag), palladium (Pb), and copper (Cu)), and alloys thereof.

[0037] A first layer may be further disposed in the first subpixel (SP_R) and the second subpixel (SP_G). For example, the first layer may be configured to contact the first and second reflective electrodes 110a and 110b in the first subpixel (SP_R) and the second subpixel (SP_G) in order to adjust the distance between the top surfaces of the first and second reflective electrodes 110a and 110b and the second electrode 114. For example, the first layer 111a may be disposed between the first electrode 113 and the first reflective electrode 110a. For example, the first layer 111b may be disposed between the first electrode 113 and the first reflective electrode 110a and 110b.

[0038] The 1-1 layer 111a may be disposed on the 1-1 reflective electrode 110a. The 1-2 layer 111b may be disposed on the 1-2 reflective electrode 110b. The 1-1 layer 111a and the 1-2 layer 111b may be formed in the first sub-pixel (SP_R) and the second sub-pixel (SP_G) by patterning the same material using a mask with different transparent and semi-transparent portions.

[0039] The 1-1 layer 111a and the 1-2 layer 111b may be made of a silicon nitride film (SiNx) or a silicon oxide film (SiOx). For example, the 1-1 layer 111a and the 1-2 layer 111b may allow the amount of light emitted from the first electrode 113 to the 1-1st to 1-3rd reflecting electrodes 110a, 110b, and 110c to be used for resonance without loss. The 1-1 layer 111a and the 1-2 layer 111b may be a cavity adjustment layer or a microcavity adjustment layer, but are not limited to these terms. As another example, the 1-1 layer 111a and the 1-2 layer 111b may be made of a transparent electrode. The 1-1 to 1-3 reflective electrodes 110a, 110b, 110c and the 1-1 layer 111a and 1-2 layer 111b form a laminated structure, and have surface contact, which has the effect of reducing the surface resistance of the first electrode 113.

[0040] According to an embodiment of the present specification, the common layer may be formed to cover all subpixels without distinction between the subpixels. The light-emitting element array of the present specification may be applied to a small size of approximately 3 inches or less, considering the movement of the eyes and the perception of images by the eyes, since the size of the entire substrate 100 is positioned close to the viewer's eyes and the distance between the substrate 100 and the viewer's eyes is fixed by a housing device with a display device. Furthermore, in order to realize images corresponding to virtual reality and augmented reality in a wearable display device, a high-resolution subpixel arrangement of 1000 pixels or more (each pixel including three or more subpixels) must be possible within a small area or size. In this case, the width of each subpixel may be less than 10 μm, but is not limited to this.

[0041] In a display device including a display panel or light-emitting element with high resolution and integration, a different deposition mask may be required for each common layer and color of the light-emitting layer to implement a different common layer or light-emitting layer for each subpixel. For example, a display panel is a layer between a first electrode and a second electrode, and may also refer to a light-emitting element, but is not limited to the term. In this specification, the terms display panel and light-emitting element may be used interchangeably. The deposition process for the organic material used as the common layer using a deposition mask involves depositing a vaporized organic material after positioning the deposition mask away from the substrate in a non-contact manner. However, it is difficult to implement a deposition mask with narrow openings. Even when narrow openings are used, interference at the edges or ends of the openings can cause problems such as incomplete alignment between the openings and the deposition area, resulting in deposition over an area larger than the openings, and different deposition thicknesses between the openings and the edges or ends. Misalignment between the deposition mask and the substrate can result in deposition of organic material in the wrong position or with different thicknesses within the same light-emitting element, which can reduce yields.

[0042] Therefore, according to the embodiments of the present specification, a wearable display device that requires miniaturization and high integration can be configured by stacking a plurality of light-emitting units each having a light-emitting layer in the same manner for all sub-pixels (SP_R, SP_G, SP_B) without differentiating light-emitting layers for each sub-pixel (SP_R, SP_G, SP_B). In addition, since the 1-1 layer 111a and the 1-2 layer 111b are configured for each sub-pixel (SP_R, SP_G, SP_B), a microcavity in which optical resonance can occur for each corresponding sub-pixel (SP_R, SP_G, SP_B) can be realized.

[0043] A first electrode 113 may be disposed on each of the first to third subpixels (SP_R, SP_G, SP_B). For example, the first electrode 113 may be disposed on the 1-1 layer 111a of the first subpixel (SP_R). For example, the first electrode 113 may be disposed on the 1-2 layer 111b of the second subpixel (SP_G). For example, the first electrode 113 may be disposed on the 1-3 reflective electrode 110c of the third subpixel (SP_B). For example, the first electrode 113 may be formed of an oxide containing at least one of indium (In), zinc (Zn), and tin (Sn), or a nitride containing at least one of titanium (Ti), zinc (Zn), and indium (In). For example, the first electrode 113 may be, but is not limited to, ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), ITZO (Indium Tin Zinc Oxide), ZnO (Zinc Oxide), TiO (Tinoxide), etc. For example, although an example is shown in which the first electrode 113 is connected to the first to third sub-pixels (SP_R, SP_G, SP_B), the first electrode 113 may be formed separately for each of the first to third sub-pixels (SP_R, SP_G, SP_B). For example, the first electrode 113 may be an anode electrode, and is not limited to the term.

[0044] A first common layer 121, a first light-emitting layer 123, and a second common layer 125 may be disposed on the first electrode 113. The first common layer 121 can transfer holes to the first light-emitting layer 123. For example, the first common layer 121 may be a hole-transporting layer. For example, the first common layer 121 may include, but is not limited to, a hole-injecting layer, a hole-transporting layer, and an electron-blocking layer. The second common layer 125 can transfer electrons to the first light-emitting layer 123. For example, the second common layer 125 may be a first electron-transporting layer. For example, the second common layer 125 may include, but is not limited to, an electron-injecting layer, an electron-transporting layer, and a hole-blocking layer. The first common layer 121, the first light-emitting layer 123, and the second common layer 125 may form a single light-emitting unit. For example, the first common layer 121, the first light-emitting layer 123, and the second common layer 125 can be a first light-emitting portion.

[0045] A third common layer 221, a second light-emitting layer 223, and a fourth common layer 225 may be disposed on the second common layer 125. For example, the third common layer 221, the second light-emitting layer 223, and the fourth common layer 225 may be disposed in the first light-emitting region. The third common layer 221 can transfer holes to the second light-emitting layer 223. For example, the third common layer 221 can include, but is not limited to, a hole injection layer, a hole transport layer, and an electron blocking layer. The fourth common layer 225 can transfer electrons to the second light-emitting layer 223. For example, the fourth common layer 225 can include, but is not limited to, an electron injection layer, an electron transport layer, and a hole blocking layer. For example, the third common layer 221, the second light-emitting layer 223, and the fourth common layer 225 may be the second light-emitting region.

[0046] The first common layer 121 and the third common layer 221 are hole injection layers and / or hole transport layers, and can transport holes to the adjacent first light-emitting layer 123 and second light-emitting layer 223. The second common layer 125 and the fourth common layer 225 are electron transport layers and / or electron injection layers, and can transport electrons to the adjacent first light-emitting layer 123 and second light-emitting layer 223.

[0047] A first charge generation layer 140 may be disposed between the second common layer 125 and the third common layer 221. For example, the first charge generation layer 140 may be disposed between the first light-emitting portion and the second light-emitting portion. The first charge generation layer 140 may include an n-type charge generation layer and a p-type charge generation layer. For example, the first charge generation layer 140 may be composed of an n-type charge generation layer and a p-type charge generation layer on top of the n-type charge generation layer.

[0048] For example, the third common layer 221 can transfer holes from the first charge generation layer 140 to the second light-emitting layer 223, and the fourth common layer 225 can assist in the injection of electrons from the second charge generation layer 240 and transport the injected electrons to the second light-emitting layer 223.

[0049] A fifth common layer 321, a third light-emitting layer 323, and a sixth common layer 325 may be disposed on the fourth common layer 225. For example, the fifth common layer 321, the third light-emitting layer 323, and the sixth common layer 325 may be disposed in the second light-emitting region. The fifth common layer 321 can transfer holes to the third light-emitting layer 323. For example, the fifth common layer 321 can include, but is not limited to, a hole-injecting layer, a hole-transporting layer, and an electron-blocking layer. The sixth common layer 325 can transfer electrons to the third light-emitting layer 323. For example, the sixth common layer 325 can include, but is not limited to, an electron-injecting layer, an electron-transporting layer, and a hole-blocking layer. For example, the fifth common layer 321, the third light-emitting layer 323, and the sixth common layer 325 may form the third light-emitting region.

[0050] The third common layer 221 and the fifth common layer 321 are hole injection and / or hole transport layers, and can transport holes to the adjacent second light-emitting layer 223 and third light-emitting layer 323. The fourth common layer 225 and the sixth common layer 325 are electron transport and / or electron injection layers, and can transport electrons to the adjacent second light-emitting layer 223 and third light-emitting layer 323.

[0051] A second charge generation layer 240 may be disposed between the fourth common layer 225 and the fifth common layer 321. For example, the second charge generation layer 240 may be disposed between the second light-emitting portion and the third light-emitting portion. The second charge generation layer 240 may include an n-type charge generation layer and a p-type charge generation layer. For example, the second charge generation layer 240 may be composed of an n-type charge generation layer and a p-type charge generation layer on top of the n-type charge generation layer.

[0052] For example, the fifth common layer 321 can transfer holes from the second charge generation layer 240 to the third light-emitting layer 323, and the sixth common layer 325 can assist in the injection of electrons at the second electrode 114 and transport the injected electrons to the third light-emitting layer 323.

[0053] According to the embodiments of the present specification, the first to sixth common layers 121, 125, 221, 225, 321, 325 may be configured with multiple layers different from each other. In the display device 10 according to the embodiments of the present specification, the first to sixth common layers 140, 160, 180, 195, the first to third light-emitting layers 123, 223, 323, and the charge generation layers 140, 240, which have hole or electron transport functions, are not distinguished by the first to third sub-pixels (SP_R, SP_G, SP_B), and each layer included in the first to third light-emitting units may be integrally formed with multiple layers covering multiple sub-pixels.

[0054] According to the embodiments of the present specification, the first to third sub-pixels (SP_R, SP_G, SP_B) can be formed in a tandem manner in common, so that each common layer and light-emitting layer can be formed using an open mask having the same or similar openings on the substrate without dividing them into sub-pixels, without using an FMM mask.

[0055] The second electrode 114 may be disposed on the sixth common layer 325. Light emitted from each of the light-emitting layers 123, 223, and 323 of each of the subpixels (SP_R, SP_G, and SP_B) is repeatedly reflected and re-reflected between the first to third reflective electrodes 110a, 110b, and 110c and the second electrode 114, generating resonance and improving the microcavity characteristics of light emitted to the second electrode 114. For example, the second electrode 114 may be a cathode electrode, and is not limited to this term. For example, compared to a display device (e.g., a TV display device) that includes three light-emitting units and uses a glass substrate, the display device according to the embodiments of the present specification can achieve a strong microcavity due to the resonance between the first reflective electrodes 110a, 110b, and 110c and the second electrode 114, thereby achieving ultra-high resolution.

[0056] For example, the second electrode 114 may be made of a reflective metal to improve or maximize the resonance effect due to light reflection and re-reflection. For example, the second electrode 114 may be made of a metal that is reflective so that light emitted from each of the light-emitting layers 123, 223, and 323 can be reflected between the first through third reflecting electrodes 110a, 110b, and 110c and the second electrode 114, and that is transparent so that light emitted from the second electrode 114 can be emitted. For example, the second electrode 114 may be made of, but is not limited to, magnesium, a magnesium alloy, silver, or a silver alloy. The second electrode 114 may be made of AgMg, an alloy of silver and magnesium. Metals or metal compounds having similar or identical reflective and transparent properties to those of a silver-magnesium alloy may be used for the second electrode 114.

[0057] The first to third reflective electrodes 110a, 110b, and 110c may be mirrors made of a metal having reflective properties, and the second electrode 114 may be a half mirror made of a reflective / transmissive electrode, which amplifies and transmits only light of a specific wavelength set at a resonance distance below the second electrode 114, while the remaining light is repeatedly reflected between the second electrode 114 and the first to third reflective electrodes 110a, 110b, and 110c. For example, if the second electrode 114 is made of AgMg or an alloy containing AgMg, the second electrode 114 can improve the reflection characteristics between the first to third reflective electrodes 110a, 110b, and 110c and the second electrode 114, and can further improve the characteristics of the microcavity due to the resonance distance of each subpixel (SP_R, SP-G, and SP_B). In each of the sub-pixels (SP_R, SP-G, SP_B), light is reflected by the upper surfaces of the 1-1 to 1-3 reflective electrodes 110a, 110b, 110c. Due to the configurations of the 1-1 layer 111a and the 1-2 layer 111b, each of the sub-pixels (SP_R, SP-G, SP_B) has a different resonance distance, and resonance occurs between the 1-1 to 1-3 reflective electrodes 110a, 110b, 110c and the second electrode 114, allowing light to be emitted through the second electrode 114. For example, the first electrode 113 has a light transmittance of about 80% or more so that light directed toward the second electrode 114 is transmitted to the 1-1 to 1-3 reflective electrodes 110a, 110b, and 110c due to reflection and resonance effects, and the first electrode 113 may be surface-treated or may further contain an interface stabilizing component for interface stability with the 1-1 layer 111a and the 1-2 layer 111b.

[0058] According to the embodiments of the present specification, when light is emitted from the light-emitting layers 123, 223, and 323 in the first to third sub-pixels (SP_R, SP-G, and SP_B), light transmitted up and down from the light-emitting layers 123, 223, and 323 is repeatedly reflected between the first to third reflective electrodes 110a, 110b, and 110c and the second electrode 114. Light of a specific wavelength can be concentrated and emitted toward the second electrode 114 through strong microcavity characteristics according to the wavelength on the top surface of each of the first to third reflective electrodes 110a, 110b, and 110c depending on the distance between the second electrodes 114. In each sub-pixel (SP_R, SP-G, SP_B), light is reflected by the upper surfaces of the 1-1 to 1-3 reflective electrodes 110a, 110b, 110c, and due to the configuration of the 1-1 and 1-2 layers 111a, 111b, the first sub-pixel (SP_R) and the second sub-pixel (SP_G) have different resonance distances, and light is emitted that resonates between the 1-1 to 1-3 reflective electrodes 110a, 110b, 110c and the second electrode 114.

[0059] The capping layer 116 may be disposed on the second electrode 114. The capping layer 116 may protect the second electrode 114 and improve light efficiency. For example, the capping layer 116 may be formed by stacking an organic layer and an inorganic layer. For example, the capping layer 116 may include one or more inorganic materials selected from the group consisting of silicon oxide (SiO), silicon nitride (SiN), zinc oxide (ZnO), titanium oxide (TiO), zirconium oxide (ZrO), indium tin oxide (ITO), indium zinc oxide (IZO), LiF, Alq, CuPc, CBP, a-NPB, and ZiO. As another example, the capping layer 116 may include an epoxy-based organic material selected from the group consisting of at least one of bisphenol-type epoxy resin, epoxidized butadiene resin, fluorine-type epoxy resin, and novolac epoxy resin.

[0060] The encapsulation layer 112 may be disposed on the capping layer 116. For example, the encapsulation layer 112 may be configured with at least one or more pairs of inorganic and organic films alternately arranged. For example, the encapsulation layer 112 may have an alternating structure of inorganic and organic films, such as a structure of multiple pairs or N pairs (N is a natural number), with the inorganic film being disposed on top of the encapsulation layer 112. As another example, the encapsulation layer 112 may be configured with a single inorganic film layer or a single organic film layer. For example, the inorganic film of the encapsulation layer may partially contain an oxide film, a nitride film, or a metal component such as aluminum. For example, the metal component such as aluminum may partially contain a metal component to maintain transparency. For example, the inorganic film of the encapsulation layer 112 may be formed wider in planar form than the organic film, and the inorganic film may prevent moisture penetration from the exterior.

[0061] The inorganic and organic layers included in the encapsulation layer 112 can cover and protect the layers below the capping layer 116. For example, the encapsulation layer 112 can be at least twice as thick as each of the layers below the capping layer 116. For example, the organic layer included in the encapsulation layer 112 can be at least 10 times as thick as each of the layers below the capping layer 116, so that even if particles are generated during the process or outgassing occurs, the particles can be stably covered.

[0062] Color filter layers may be disposed on the sealing layer 112. The first to third color filter layers 113a, 113b, and 113c disposed in the respective sub-pixels (SP_R, SP-G, and SP_B) transmit only wavelengths of colors required for the corresponding sub-pixels from the white light emitted from the light-emitting layers 123, 223, and 323. For example, the first color filter layer 113a may correspond to the first sub-pixel (SP_R). For example, the second color filter layer 113b may correspond to the second sub-pixel (SP_G). For example, the third color filter layer 113c may correspond to the third sub-pixel (SP_B).

[0063] For example, the first color filter layer 113a can transmit light with a wavelength of approximately 600 nm to 650 nm. The second color filter layer 113b can transmit light with a wavelength of approximately 500 nm to 590 nm. The third color filter layer 113c can transmit light with a wavelength of approximately 420 nm to 480 nm. As another example, when realizing a color combination other than blue, red, and green, other color combinations may be possible as long as white light can be produced by combining the three colors cyan, magenta, and yellow. As another example, combinations of two colors or four or more colors other than three colors may also be possible.

[0064] FIG. 1 shows three light-emitting units each having a light-emitting layer of a different color. The inventors of the present specification recognized that the efficiency and / or brightness of the light-emitting layer may differ depending on the position of the light-emitting layer in each of the three light-emitting units, depending on the distance (or total thickness) between the first electrode and the second electrode. The inventors of the present specification conducted various experiments on the position of the light-emitting layer, taking into account the efficiency and / or brightness of the light-emitting layer in each of the three light-emitting units. This will also be described with reference to FIGS. 2A to 4C.

[0065] 2A to 2C are diagrams showing contour maps of a blue light-emitting layer according to an example of the present specification.

[0066] In Figures 2A to 2C, the horizontal axis represents wavelength (nm), and the vertical axis represents the distance between the first and second electrodes or the thickness of the layer between the first and second electrodes (nm). For example, the thickness or distance between the first and second electrodes may be the total thickness of the layer between the first and second electrodes. For example, Figures 2A to 2C show the position of the light-emitting node of the light-emitting layer depending on the distance between the first and second electrodes or the thickness of the layer between the first and second electrodes. For example, the distance between the first and second electrodes or the thickness of the layer between the first and second electrodes is 310 nm, 385 nm, and 450 nm, and the position of the light-emitting node of the blue light-emitting layer depending on the distance or thickness is shown. In the case of a two-light-emitting element, the distance between the first and second electrodes or the thickness of the layer between the first and second electrodes is 310 nm. Considering the distance of 45 nm from the second electrode to the nearest light-emitting node, when configuring with three light-emitting units, if the last light-emitting node is a green light-emitting layer, the distance from the second electrode to the green light-emitting layer is 340 nm, so the distance between the first electrode and the second electrode or the layer thickness between the first electrode and the second electrode is 385 nm. Considering the distance of 45 nm from the second electrode to the nearest light-emitting node, when configuring with three light-emitting units, if the last light-emitting node is a red light-emitting layer or a blue light-emitting layer, the distance from the second electrode to the red light-emitting layer or the blue light-emitting layer is 405 nm, so the distance between the first electrode and the second electrode or the layer thickness between the first electrode and the second electrode is 450 nm.

[0067] 2A to 2C show contour maps of a blue light-emitting layer when the Purcell effect is applied. The contour maps illustrate the light-emitting position of the light-emitting layer (or the light-emitting efficiency of the light-emitting layer) depending on the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode. The Purcell effect is a phenomenon in which the efficiency of the light-emitting layer decreases as the light-emitting layer is closer to the electrode. The Purcell factor of the display panel according to the embodiment of this specification is approximately 0.7, but is not limited to this.

[0068] 2A to 2C, the positions of the light-emitting nodes may vary depending on the dopants and arrangement of the light-emitting layer. The first node (A) may be a portion close to the second electrode, and the second node (B) and the third node (C) may be portions far from the second electrode. For example, the nodes may be light-emitting nodes, and are not limited to the term.

[0069] FIG. 2A shows a case where the distance between the first and second electrodes or the layer thickness between the first and second electrodes is 310 nm. Referring to FIG. 2A, at a wavelength of 460 nm, the first node (A) of the blue light-emitting layer has an efficiency of approximately 67%. At a wavelength of 460 nm, the second node (B) of the blue light-emitting layer has an efficiency of approximately 100%. At a wavelength of 460 nm, the third node (C) of the blue light-emitting layer has an efficiency of approximately 70%. Therefore, when the distance between the first and second electrodes or the layer thickness between the first and second electrodes is 310 nm, it can be seen that the maximum efficiency can be achieved when the blue light-emitting layer is located at the second node (B) from the second electrode. For example, when the distance between the first and second electrodes or the layer thickness between the first and second electrodes is 310 nm, it can be seen that the maximum efficiency can be achieved when the blue light-emitting layer is located 155 nm from the second electrode.

[0070] FIG. 2B shows a case where the distance between the first and second electrodes or the layer thickness between the first and second electrodes is 385 nm. Referring to FIG. 2B, the first node (A) of the blue light-emitting layer has an efficiency of approximately 50% at a wavelength of 460 nm. The second node (B) of the blue light-emitting layer has an efficiency of approximately 90% at a wavelength of 460 nm. The third node (C) of the blue light-emitting layer has an efficiency of approximately 66% at a wavelength of 460 nm. Therefore, when the distance between the first and second electrodes or the layer thickness between the first and second electrodes is 385 nm, it can be seen that the maximum efficiency can be achieved when the blue light-emitting layer is located at the second node (B) from the second electrode. For example, when the distance between the first and second electrodes or the layer thickness between the first and second electrodes is 385 nm, it can be seen that the maximum efficiency can be achieved when the blue light-emitting layer is located 155 nm from the second electrode.

[0071] FIG. 2C shows a case where the distance between the first and second electrodes or the layer thickness between the first and second electrodes is 450 nm. Referring to FIG. 2C, the first node (A) of the blue light-emitting layer at a wavelength of 460 nm has an efficiency of approximately 45%. The second node (B) of the blue light-emitting layer at a wavelength of 460 nm has an efficiency of approximately 83%. The third node (C) of the blue light-emitting layer at a wavelength of 460 nm has an efficiency of approximately 85%. The fourth node (D) of the blue light-emitting layer at a wavelength of 460 nm has an efficiency of approximately 62%. Therefore, when the distance between the first and second electrodes or the layer thickness between the first and second electrodes is 450 nm, the blue light-emitting layer can be maximized when it is located at the second node (B) or the third node (C) from the second electrode. For example, when the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 450 nm, it can be seen that the maximum efficiency can be achieved when the blue light-emitting layer is located 155 nm or 275 nm from the second electrode.

[0072] The efficiency of the light-emitting layer may decrease as the distance from the second electrode increases, as the node becomes more inclined and the overlap area with the PL (photoluminescence) peak decreases. For example, as the distance between the first and second electrodes increases, the node becomes narrower and the overlap area with the PL peak decreases, which may decrease the efficiency of the light-emitting layer. For example, it has been found that the efficiency of a blue light-emitting layer decreases as the distance between the first and second electrodes or the thickness of the layer between the first and second electrodes increases.

[0073] 2A to 2C, when the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 310 nm, the blue light-emitting layer may have a first node (A) formed 35 nm away from the second electrode, and light-emitting nodes may be formed regularly at 120 nm intervals. For example, light-emitting nodes may be formed at positions such as 35 nm, 155 nm, and 275 nm. For example, a fourth node (D) may be formed at 405 nm. Therefore, in the case of a blue light-emitting layer, when the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is at least 405 nm, an additional fourth node (D) may be formed at the 405 nm position.

[0074] According to the examples herein, when the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 310 nm, the blue light-emitting layer can be located 155 nm from the second electrode. The efficiency of the blue light-emitting layer can be improved when the blue light-emitting layer is located at this position. According to the examples herein, when the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 385 nm, the blue light-emitting layer can be located 155 nm from the second electrode. The efficiency of the blue light-emitting layer can be improved when the blue light-emitting layer is located at this position. According to the examples herein, when the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 450 nm, the blue light-emitting layer can be located 155 nm or 275 nm from the second electrode. The efficiency of the blue light-emitting layer can be improved when the blue light-emitting layer is located at this position.

[0075] 3A to 3C are diagrams showing contour maps of a green light-emitting layer according to an example of the present specification.

[0076] In Figures 3A-3C, the horizontal axis represents wavelength (nm), and the vertical axis represents the distance between the first and second electrodes or the thickness of the layer between the first and second electrodes (nm). For example, the thickness of the layer between the first and second electrodes can be the total thickness of the layer between the first and second electrodes. For example, Figures 3A-3C show the position of the light-emitting layer depending on the distance between the first and second electrodes or the thickness of the layer between the first and second electrodes. For example, the distance between the first and second electrodes or the thickness of the layer between the first and second electrodes are 310 nm, 385 nm, and 450 nm, and the position of the light-emitting node of the green light-emitting layer depending on the distance or layer thickness is shown. Figures 3A-3C show contour maps of the green light-emitting layer when the Purcell effect is applied.

[0077] FIG. 3A shows a case where the distance between the first electrode and the second electrode or the layer thickness between the first electrode and the second electrode is 310 nm. Referring to FIG. 3A, the first node (A) of the green light-emitting layer exhibits an efficiency of approximately 68% at a wavelength of 540 nm. The second node (B) of the green light-emitting layer exhibits an efficiency of approximately 100% at a wavelength of 540 nm. Therefore, when the distance between the first electrode and the second electrode or the layer thickness between the first electrode and the second electrode is 310 nm, the green light-emitting layer can have maximum efficiency when located at the second node (B) from the second electrode. For example, when the distance between the first electrode and the second electrode or the layer thickness between the first electrode and the second electrode is 310 nm, the green light-emitting layer can have maximum efficiency when located 195 nm from the second electrode.

[0078] Figure 3B shows a graph where the distance between the first and second electrodes or the layer thickness between the first and second electrodes is 385 nm. Referring to Figure 3B, the first node (A) of the green light-emitting layer exhibits an efficiency of approximately 62% at a wavelength of 540 nm. The second node (B) of the green light-emitting layer exhibits an efficiency of approximately 91% at a wavelength of 540 nm. The third node (C) of the green light-emitting layer exhibits an efficiency of approximately 64% at a wavelength of 540 nm. Therefore, when the distance between the first and second electrodes or the layer thickness between the first and second electrodes is 385 nm, the green light-emitting layer can be maximized when it is located at the second node (B) from the second electrode. For example, when the distance between the first and second electrodes or the layer thickness between the first and second electrodes is 385 nm, the green light-emitting layer can be maximized when it is located 195 nm from the second electrode.

[0079] Figure 3C shows the results when the distance between the first and second electrodes or the layer thickness between the first and second electrodes is 450 nm. Referring to Figure 3C, the first node (A) of the green light-emitting layer exhibits an efficiency of approximately 51% at a wavelength of 540 nm. The second node (B) of the green light-emitting layer exhibits an efficiency of approximately 77% at a wavelength of 540 nm. The third node (C) of the green light-emitting layer exhibits an efficiency of approximately 54% at a wavelength of 540 nm. Therefore, when the distance between the first and second electrodes or the layer thickness between the first and second electrodes is 450 nm, the green light-emitting layer can have maximum efficiency when located at the second node (B) from the second electrode. For example, when the distance between the first and second electrodes or the layer thickness between the first and second electrodes is 450 nm, the green light-emitting layer can have maximum efficiency when located 195 nm from the second electrode.

[0080] 3A to 3C, it can be seen that the efficiency of the light-emitting layer decreases as the distance from the second electrode increases, as the node becomes more inclined and the overlapping area with the PL (Photoluminescence) peak decreases. For example, as the distance between the first and second electrodes or the thickness of the layer between the first and second electrodes increases, the node becomes narrower and the overlapping area with the PL peak decreases, which can reduce the efficiency of the light-emitting layer. For example, it can be seen that the efficiency of the green light-emitting layer decreases as the distance between the first and second electrodes or the thickness of the layer between the first and second electrodes increases.

[0081] 3A to 3C, when the distance between the first and second electrodes or the thickness of the layer between the first and second electrodes is 310 nm, the green light-emitting layer has a first node (A) formed 50 nm away from the second electrode, and light-emitting nodes are formed regularly at 145 nm intervals, for example, at positions such as 50 nm, 195 nm, and 340 nm.

[0082] According to the examples herein, when the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 310 nm, the green light-emitting layer can be located 195 nm from the second electrode. The efficiency of the green light-emitting layer can be improved when the green light-emitting layer is located at this position. According to the examples herein, when the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 385 nm, the green light-emitting layer can be located 195 nm from the second electrode. The efficiency of the green light-emitting layer can be improved when the green light-emitting layer is located at this position. According to the examples herein, when the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 450 nm, the green light-emitting layer can be located 195 nm from the second electrode. The efficiency of the green light-emitting layer can be improved when the green light-emitting layer is located at this position.

[0083] 4A to 4C are diagrams showing contour maps of the red light-emitting layer according to an example of the present specification.

[0084] In Figures 4A-4C, the horizontal axis represents wavelength (nm), and the vertical axis represents the distance between the first and second electrodes or the thickness of the layer between the first and second electrodes (nm). For example, the thickness of the layer between the first and second electrodes can be the total thickness of the layer between the first and second electrodes. For example, Figures 4A-4C show the position of the light-emitting layer depending on the distance between the first and second electrodes or the thickness of the layer between the first and second electrodes. For example, the distance between the first and second electrodes or the thickness of the layer between the first and second electrodes are 310 nm, 385 nm, and 450 nm, and the position of the red light-emitting layer depending on the distance or thickness is shown. Figures 4A-4C show contour maps of the red light-emitting layer when the Purcell effect is applied.

[0085] FIG. 4A shows a case where the distance between the first and second electrodes or the layer thickness between the first and second electrodes is 310 nm. Referring to FIG. 4A, the first node (A) of the red light-emitting layer exhibits an efficiency of approximately 65% ​​at a wavelength of 620 nm. The second node (B) of the red light-emitting layer exhibits an efficiency of approximately 92% at a wavelength of 620 nm. Therefore, when the distance between the first and second electrodes or the layer thickness between the first and second electrodes is 310 nm, the red light-emitting layer can be maximized when it is located at the second node (B) from the second electrode. For example, when the distance between the first and second electrodes or the layer thickness between the first and second electrodes is 310 nm, the red light-emitting layer can be maximized when it is located 230 nm from the second electrode.

[0086] Figure 4B shows a case where the distance between the first and second electrodes or the layer thickness between the first and second electrodes is 385 nm. Referring to Figure 4B, the first node (A) of the red light-emitting layer exhibits an efficiency of approximately 72% at a wavelength of 620 nm. The second node (B) of the green light-emitting layer exhibits an efficiency of approximately 100% at a wavelength of 620 nm. Therefore, when the distance between the first and second electrodes or the layer thickness between the first and second electrodes is 385 nm, the red light-emitting layer can be maximized when it is located at the second node (B) from the second electrode. For example, when the distance between the first and second electrodes or the layer thickness between the first and second electrodes is 385 nm, the red light-emitting layer can be maximized when it is located 230 nm from the second electrode.

[0087] Figure 4C shows the results when the distance between the first and second electrodes or the layer thickness between the first and second electrodes is 450 nm. Referring to Figure 4C, at a wavelength of 620 nm, the first node (A) of the red light-emitting layer exhibits an efficiency of approximately 57%. At a wavelength of 620 nm, the second node (B) of the red light-emitting layer exhibits an efficiency of approximately 80%. At a wavelength of 620 nm, the third node (C) of the red light-emitting layer exhibits an efficiency of approximately 58%. Therefore, when the distance between the first and second electrodes or the layer thickness between the first and second electrodes is 450 nm, the red light-emitting layer can be maximized when it is located at the second node (B) from the second electrode. For example, when the distance between the first and second electrodes or the layer thickness between the first and second electrodes is 450 nm, the red light-emitting layer can be maximized when it is located 230 nm from the second electrode.

[0088] 4A to 4C, the efficiency of the light-emitting layer decreases because the node tilts more as it moves away from the second electrode and the overlapping area with the PL (photoluminescence) peak decreases. For example, as the distance between the first and second electrodes or the thickness of the layer between the first and second electrodes increases, the node narrows and the overlapping area with the PL peak decreases, which can decrease the efficiency of the light-emitting layer.

[0089] 4A to 4C, when the thickness of the layer between the first electrode and the second electrode or the distance between the first electrode and the second electrode is 310 nm, the red light-emitting layer forms a first node (A) at a position 55 nm away from the second electrode, and light-emitting nodes are formed regularly at 175 nm intervals, for example, at positions such as 55 nm, 230 nm, and 405 nm.

[0090] According to the examples herein, when the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 310 nm, the red light-emitting layer can be located 230 nm from the second electrode. The efficiency of the red light-emitting layer can be improved when the red light-emitting layer is located at this position. According to the examples herein, when the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 385 nm, the red light-emitting layer can be located 230 nm from the second electrode. The efficiency of the red light-emitting layer can be improved when the red light-emitting layer is located at this position. According to the examples herein, when the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 450 nm, the red light-emitting layer can be located 230 nm from the second electrode. The efficiency of the red light-emitting layer can be improved when the red light-emitting layer is located at this position.

[0091] 2A to 4C, when the distance between the first and second electrodes or the thickness of the layers between the first and second electrodes is 310 nm, the blue light-emitting layer has the highest efficiency at 155 nm and 275 nm from the second electrode, the green light-emitting layer has the highest efficiency at 195 nm and 50 nm from the second electrode, and the red light-emitting layer has the highest efficiency at 230 nm and 55 nm from the second electrode. Arranging the light-emitting layers in order of efficiency can be achieved by configuring the blue, green, and red light-emitting layers from the second electrode. However, since the blue and green light-emitting layers are positioned close to each other, it is not possible to position a layer between them, making it difficult to construct a display panel. Furthermore, since the green and red light-emitting layers are positioned close to each other, it is not possible to position a layer between them, making it difficult to construct a display panel. The green light-emitting layer can be positioned at 195 nm to improve the efficiency of the green light-emitting layer. The red and blue light-emitting layers can then be positioned at the second most efficient positions. For example, the red, green, and blue light-emitting layers can be arranged from the second electrode. For example, the red light-emitting layer can be arranged 55 nm from the second electrode, the green light-emitting layer can be arranged 195 nm from the second electrode, and the blue light-emitting layer can be arranged 275 nm from the second electrode.

[0092] As another example, since the efficiency of the blue light-emitting layer is insufficient compared to the efficiency of the red and green light-emitting layers, the blue light-emitting layer can be configured to be located 155 nm from the second electrode to take the efficiency of the blue light-emitting layer into consideration. The red light-emitting layer can then be positioned 230 nm from the second electrode to improve the efficiency of the red light-emitting layer. This can improve the efficiency of the blue and red light-emitting layers. For example, the second electrode can be configured with a green light-emitting layer, a blue light-emitting layer, and a red light-emitting layer. For example, the green light-emitting layer can be positioned 50 nm from the second electrode, the blue light-emitting layer can be positioned 155 nm from the second electrode, and the red light-emitting layer can be positioned 230 nm from the second electrode.

[0093] 2A to 4C, when the distance between the first and second electrodes or the thickness of the layers between the first and second electrodes is 385 nm, the blue light-emitting layer has the highest efficiency at 155 nm, 275 nm, and 35 nm from the second electrode, the green light-emitting layer has the highest efficiency at 195 nm and 340 nm from the second electrode, and the red light-emitting layer has the highest efficiency at 230 nm and 55 nm from the second electrode. Arranging the light-emitting layers in order of efficiency can be achieved by configuring the blue, green, and red light-emitting layers from the second electrode. However, this can create a problem in that the blue and green light-emitting layers are located close to each other, making it difficult to construct a display panel. Because the efficiency of the blue light-emitting layer is poor compared to the efficiency of the red and green light-emitting layers, the blue light-emitting layer can be positioned 155 nm from the second electrode to improve its efficiency. The green light-emitting layer can be positioned at 340 nm, the second most efficient location for the green light-emitting layer. The red light-emitting layer can then be positioned at 55 nm, the second most efficient position for the red light-emitting layer. This can improve the efficiency of the blue light-emitting layer. For example, the red light-emitting layer, blue light-emitting layer, and green light-emitting layer can be configured from the second electrode. For example, the red light-emitting layer can be positioned 55 nm from the second electrode, the blue light-emitting layer can be positioned 155 nm from the second electrode, and the green light-emitting layer can be positioned 340 nm from the second electrode.

[0094] As another example, it can be seen that the efficiency of the red light-emitting layer is improved when the red light-emitting layer is located 230 nm from the second electrode. The green light-emitting layer can be located at 340 nm, which is the second most efficient location for the green light-emitting layer. The blue light-emitting layer can then be located at 35 nm, which is the third most efficient location for the blue light-emitting layer. This can improve the efficiency of the red light-emitting layer. For example, the second electrode can be configured with a blue light-emitting layer, a red light-emitting layer, and a green light-emitting layer. Therefore, the blue light-emitting layer can be located 35 nm from the second electrode, the red light-emitting layer can be located 230 nm from the second electrode, and the green light-emitting layer can be located 340 nm from the second electrode.

[0095] 2A to 4C, when the distance between the first and second electrodes or the thickness of the layers between the first and second electrodes is 450 nm, the blue light-emitting layer has the highest efficiency at 230 nm, 155 nm, 275 nm, 405 nm, and 35 nm from the second electrode, the green light-emitting layer has the highest efficiency at 195 nm, 340 nm, and 50 nm from the second electrode, and the red light-emitting layer has the highest efficiency at 230 nm, 405 nm, and 55 nm from the second electrode. Arranging the light-emitting layers in order of highest efficiency would result in a blue, green, and red light-emitting layer from the second electrode. However, this results in the blue and green light-emitting layers being positioned close to each other, making it difficult to construct a display panel. Positioning the green light-emitting layer 195 nm from the second electrode improves the efficiency of the green light-emitting layer, but the efficiency of the blue and red light-emitting layers may be reduced. Therefore, considering the efficiency of the red light-emitting layer, the red light-emitting layer can be positioned at 230 nm. Furthermore, considering the layers between the light-emitting layers, the green light-emitting layer and the blue light-emitting layer can also be positioned. For example, the second electrode can be configured with a green light-emitting layer, a red light-emitting layer, and a blue light-emitting layer. Therefore, the green light-emitting layer can be positioned 50 nm from the second electrode, the red light-emitting layer can be positioned 230 nm from the second electrode, and the blue light-emitting layer can be positioned 405 nm from the second electrode.

[0096] As another example, considering the efficiency of the green light-emitting layer, it can be seen that if the green light-emitting layer is located 195 nm from the second electrode, the efficiency of the green light-emitting layer is improved. The red light-emitting layer can be located at 405 nm, which is the second most efficient wavelength. This can improve the efficiency of the green light-emitting layer. For example, the second electrode can be configured with a blue light-emitting layer, a green light-emitting layer, and a red light-emitting layer. Therefore, the blue light-emitting layer can be located 35 nm from the second electrode, the green light-emitting layer can be located 195 nm from the second electrode, and the red light-emitting layer can be located 405 nm from the second electrode.

[0097] Taking into consideration the efficiency of the light-emitting layer depending on the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode in Figures 2A to 4C, a display panel including a light-emitting section is constructed, which will be described with reference to Figures 5 to 11.

[0098] FIG. 5 is a diagram showing a display panel according to an embodiment of this specification.

[0099] 5, a display panel 11 according to an embodiment of the present specification may include a first electrode 113, light-emitting layers 1123, 1223, and 1323, and a second electrode 114. In the description of each layer included in the display panel, the same content as that described in FIG. 1 may be omitted or may be simply described.

[0100] A first light-emitting portion, a second light-emitting portion, and a third light-emitting portion may be included between the first electrode 113 and the second electrode 114. The light-emitting layers 1123, 1223, and 1323 included in the first light-emitting portion, the second light-emitting portion, and the third light-emitting portion may emit light of different colors. A capping layer 116 may be further included on the second electrode 114.

[0101] As described in Figures 2A to 4C, Figure 5 shows that the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 310 nm, and the second electrode can be composed of a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer.

[0102] The first light-emitting unit may include a first common layer 121, a first light-emitting layer 1123, and a second common layer 125. The first common layer 121 may be a hole transport layer. For example, the first common layer 121 may be composed of two layers: a hole main injection layer 121a and a hole transport layer 121b. The first light-emitting layer 1123 may be a blue light-emitting layer. The second common layer 125 may be an electron transport layer. For example, the second common layer 125 may be an electron transport layer. As another example, each of the first common layer 121 and the second common layer 125 may be composed of two or more hole transport layers and two or more electron transport layers.

[0103] For example, the first light-emitting layer 1123 may be composed of at least one host and at least one dopant. For example, the dopant of the first light-emitting layer 1123 may be a blue fluorescent dopant. The peak wavelength of the blue fluorescent dopant may be in the range of 420 nm to 480 nm. This allows for the emission of blue light close to deep blue. The blue dopant may have a full width at half maximum (FWHM) of 20 nm to 35 nm, and may have an intensity of 50% or more of the peak wavelength within a narrow FWHM. Light emitted within a narrow deep blue wavelength range from the first light-emitting layer 1123 may undergo microresonation at the distance between the reflective electrode 110c and the second electrode 114 in the third sub-pixel (SP_B), be amplified, and then emitted to the second electrode 114. For example, the use of a blue dopant with a narrow FWHM has the advantage of reducing the amount of light lost when passing through the third color filter layer 113c. As another example, the first light-emitting layer 1123 may be formed with a blue phosphorescent dopant. The peak wavelength of the blue phosphorescent dopant may be in the range of 420 nm to 480 nm. Using a blue phosphorescent dopant may further improve the efficiency and brightness of the first light-emitting layer 1123. As another example, the first light-emitting layer 1123 may be formed with a thermally activated delayed fluorescence (TADF) dopant. The peak wavelength of the thermally activated delayed fluorescence dopant may be in the range of 420 nm to 480 nm. Thermally activated delayed fluorescence (TADF) allows reverse intersystem crossing from a triplet excited state to a singlet excited state, and excitons in the triplet state are utilized for light emission, thereby improving the luminous efficiency of the first light-emitting layer 1123. For example, the first light-emitting layer 1123 may be disposed 275 nm from the second electrode 114. For example, the first light-emitting layer 1123 may be disposed 275 nm from the lower surface of the second electrode 114 .

[0104] The second light-emitting portion may include a third common layer 221, a second light-emitting layer 1223, and a fourth common layer 225. The third common layer 221 may be a hole transport layer. For example, the third common layer 221 may be composed of two hole transport layers. The second light-emitting layer 1223 may be a green light-emitting layer. The fourth common layer 225 may be an electron transport layer. For example, the fourth common layer 225 may be an electron transport layer. In another example, the third common layer 221 and the fourth common layer 225 may each be composed of two or more hole transport layers and two or more electron transport layers. For example, the third common layer 221 may be composed of the same material as the first common layer 121. For example, the fourth common layer 225 may be composed of the same material as the second common layer 125.

[0105] For example, the second light-emitting layer 1223 can be composed of at least one host and at least one dopant. For example, the dopant of the second light-emitting layer 1223 can be composed of a phosphorescent dopant. For example, the dopant of the second light-emitting layer 1223 can have a peak wavelength of 500 nm to 590 nm and can include one or more dopants selected from green, yellow-green, and yellow. For example, the second light-emitting layer 1223 can be disposed 195 nm from the second electrode 114. For example, the second light-emitting layer 1223 can be disposed 195 nm from the bottom surface of the second electrode 114.

[0106] A first charge generation layer may be disposed between the first light emitting portion and the second light emitting portion, and may include a first n-type charge generation layer 141 and a first p-type charge generation layer 142.

[0107] The third light-emitting unit may include a fifth common layer 321, a third light-emitting layer 1323, and a sixth common layer 325. The fifth common layer 321 may be a hole transport layer. For example, the fifth common layer 321 may be formed of a hole transport layer. The third light-emitting layer 1323 may be a red light-emitting layer. The sixth common layer 325 may be an electron transport layer. For example, an electron injection layer 325a may be further included on the sixth common layer 325. For another example, the electron injection layer 325a may be omitted. For another example, each of the fifth common layer 321 and the sixth common layer 325 may be formed of two or more hole transport layers and two or more electron transport layers. For example, the fifth common layer 321 may be formed of the same material as one or more of the first common layer 121 and the third common layer 221. For example, the sixth common layer 325 may be made of the same material as one or more of the second common layer 125 and the fourth common layer 225 .

[0108] For example, the third light-emitting layer 1323 may be composed of at least one host and at least one dopant. For example, the dopant of the third light-emitting layer 1323 may be composed of a red light dopant. For example, the dopant of the third light-emitting layer 1323 may have a peak wavelength of 600 nm to 650 nm and may include a red dopant. For example, the third light-emitting layer 1323 may be disposed 55 nm from the second electrode 114. For example, the third light-emitting layer 1323 may be disposed 55 nm from the bottom surface of the second electrode 114.

[0109] A second charge generation layer may be disposed between the second light emitting portion and the third light emitting portion. The second charge generation layer may include a second n-type charge generation layer 241 and a second p-type charge generation layer 242.

[0110] According to the embodiments of the present specification, the first light-emitting layer 1123 may be a blue light-emitting layer, the second light-emitting layer 1223 may be a green light-emitting layer, and the third light-emitting layer 1323 may be a red light-emitting layer. Since the first to third light-emitting sections are configured with light-emitting layers of different colors, it is possible to solve the problem of reduced efficiency and reduced brightness of the light-emitting layers due to exciton sharing between the two light-emitting sections when two light-emitting sections are configured. For example, when two light-emitting sections are configured, the second light-emitting section may be configured with a junction of a red light-emitting layer and a green light-emitting layer, and the red and green light-emitting layers may share excitons, which may reduce the efficiency of the red and green light-emitting layers and reduce the brightness of the display device.

[0111] FIG. 6 is a diagram illustrating a display panel according to an embodiment of the present specification.

[0112] 6, a display panel 21 according to an embodiment of the present specification may include a first electrode 113, light-emitting layers 2123, 2223, and 2323, and a second electrode 114. In the description of each layer included in the display panel, the same content as that described in FIG. 1 may be omitted or simplified.

[0113] A first light-emitting portion, a second light-emitting portion, and a third light-emitting portion may be included between the first electrode 113 and the second electrode 114. The light-emitting layers 2123, 2223, and 2323 included in the first light-emitting portion, the second light-emitting portion, and the third light-emitting portion may emit light of different colors. A capping layer 116 may be further included on the second electrode 114.

[0114] As described in Figures 2A to 4C, Figure 6 shows that the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 310 nm, and the second electrode can be composed of a green light-emitting layer, a blue light-emitting layer, and a red light-emitting layer.

[0115] The first light-emitting unit may include a first common layer 121, a first light-emitting layer 2123, and a second common layer 125. The first common layer 121 and the second common layer 125 are the same as those described with reference to FIGS. 1 and 5, and therefore will not be described here. The first light-emitting layer 2123 may be a red light-emitting layer. For example, the first light-emitting layer 2123 may be composed of at least one host and at least one dopant. For example, the dopant of the first light-emitting layer 2123 may be a red phosphorescent dopant. For example, the peak wavelength of the red dopant may be in the range of 600 nm to 650 nm. For example, the first light-emitting layer 2123 may be disposed 230 nm from the second electrode 114. For example, the first light-emitting layer 2123 may be disposed 230 nm from the bottom surface of the second electrode 114.

[0116] The second light-emitting portion may include a third common layer 221, a second light-emitting layer 2223, and a fourth common layer 225. The third common layer 221 and the fourth common layer 225 are the same as those described with reference to FIGS. 1 and 5, and therefore will not be described here. The second light-emitting layer 2223 may be a blue light-emitting layer. For example, the second light-emitting layer 2223 may be composed of at least one host and at least one dopant. For example, the dopant of the second light-emitting layer 2223 may be composed of one or more of a blue fluorescent dopant, a blue phosphorescent dopant, and a delayed fluorescent dopant. The peak wavelength of the blue dopant may be in the range of 420 nm to 480 nm. For example, the second light-emitting layer 2223 may be disposed 155 nm from the second electrode 114. For example, the second light-emitting layer 2223 may be disposed 155 nm from the bottom surface of the second electrode 114.

[0117] A first charge generation layer may be disposed between the first light emitting portion and the second light emitting portion, and may include a first n-type charge generation layer 141 and a first p-type charge generation layer 142.

[0118] The third light-emitting portion may include a fifth common layer 321, a third light-emitting layer 2323, and a sixth common layer 325. The fifth common layer 321 and the sixth common layer 325 are the same as those described with reference to FIGS. 1 and 5, and therefore will not be described here. The third light-emitting layer 2323 may be a green light-emitting layer. For example, the third light-emitting layer 2323 may be composed of at least one host and at least one dopant. For example, the dopant of the third light-emitting layer 2323 may be a green phosphorescent dopant. For example, the dopant of the third light-emitting layer 2323 may have a peak wavelength of 500 nm to 590 nm and may include one or more dopants selected from green, yellow-green, and yellow. For example, the third light-emitting layer 2323 may be disposed 50 nm from the second electrode 114. For example, the third light-emitting layer 2323 may be disposed 50 nm from the bottom surface of the second electrode 114.

[0119] A second charge generation layer may be disposed between the second light emitting portion and the third light emitting portion. The second charge generation layer may include a second n-type charge generation layer 241 and a second p-type charge generation layer 242.

[0120] According to the embodiments of the present specification, the first light-emitting layer 2123 may be a red light-emitting layer, the second light-emitting layer 2223 may be a blue light-emitting layer, and the third light-emitting layer 2323 may be a green light-emitting layer. Since the first to third light-emitting sections are each configured with a different color light-emitting layer, this solves the problem of reduced efficiency and reduced brightness of the light-emitting layers due to exciton sharing between the two light-emitting sections when two light-emitting sections are configured. For example, when two light-emitting sections are configured, the second light-emitting section may be configured with a junction of a red light-emitting layer and a green light-emitting layer, and the red and green light-emitting layers may share excitons, thereby solving the problem of reduced efficiency and reduced brightness of the display device.

[0121] FIG. 7 is a diagram illustrating a display panel according to an embodiment of the present specification.

[0122] 7, a display panel 31 according to an embodiment of the present specification may include a first electrode 113, light-emitting layers 3123, 3223, and 3323, and a second electrode 114. In the description of each layer included in the display panel, the same content as that described in FIG. 1 may be omitted or may be simply described.

[0123] A first light-emitting portion, a second light-emitting portion, and a third light-emitting portion may be included between the first electrode 113 and the second electrode 114. The light-emitting layers 3123, 3223, and 3323 included in the first light-emitting portion, the second light-emitting portion, and the third light-emitting portion may emit light of different colors. A capping layer 116 may be further included on the second electrode 114.

[0124] As described in Figures 2A to 4C, Figure 7 shows that the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 385 nm, and the second electrode can be composed of a red light-emitting layer, a blue light-emitting layer, and a green light-emitting layer.

[0125] The first light-emitting unit may include a first common layer 121, a first light-emitting layer 3123, and a second common layer 125. The first common layer 121 and the second common layer 125 are the same as those described with reference to FIGS. 1 and 5, and therefore will not be described here. The first light-emitting layer 3123 may be a green light-emitting layer. For example, the first light-emitting layer 3123 may be composed of at least one host and at least one dopant. For example, the dopant of the first light-emitting layer 3123 may be a green phosphorescent dopant. For example, the dopant of the first light-emitting layer 3123 may have a peak wavelength in the range of 500 nm to 590 nm and may include one or more dopants selected from green, yellow-green, and yellow. For example, the first light-emitting layer 3123 may be disposed 340 nm from the second electrode 114. For example, the first light-emitting layer 3123 may be disposed 340 nm from the bottom surface of the second electrode 114.

[0126] The second light-emitting unit may include a third common layer 221, a second light-emitting layer 3223, and a fourth common layer 225. The third common layer 221 and the fourth common layer 225 are the same as those described with reference to FIGS. 1 and 5, and therefore will not be described here. The second light-emitting layer 3223 may be a blue light-emitting layer. For example, the second light-emitting layer 3223 may be composed of at least one host and at least one dopant. For example, the dopant of the second light-emitting layer 3223 may be composed of one or more of a blue fluorescent dopant, a blue phosphorescent dopant, and a delayed fluorescent dopant. The peak wavelength of the blue dopant may be in the range of 420 nm to 480 nm. For example, the second light-emitting layer 3223 may be disposed 155 nm from the second electrode 114. For example, the second light-emitting layer 3223 may be disposed 155 nm from the bottom surface of the second electrode 114.

[0127] A first charge generation layer may be disposed between the first light emitting portion and the second light emitting portion, and may include a first n-type charge generation layer 141 and a first p-type charge generation layer 142.

[0128] The third light-emitting unit may include a fifth common layer 321, a third light-emitting layer 3323, and a sixth common layer 325. The fifth common layer 321 and the sixth common layer 325 are the same as those described with reference to FIGS. 1 and 5, and therefore will not be described here. The third light-emitting layer 3323 may be a red light-emitting layer. For example, the third light-emitting layer 3323 may be composed of at least one host and at least one dopant. For example, the dopant of the third light-emitting layer 3323 may be a red phosphorescent dopant. For example, the peak wavelength of the red dopant may be in the range of 600 nm to 650 nm. For example, the third light-emitting layer 3323 may be disposed 55 nm from the second electrode 114. For example, the third light-emitting layer 3323 may be disposed 55 nm from the bottom surface of the second electrode 114.

[0129] A second charge generation layer may be disposed between the second light emitting portion and the third light emitting portion. The second charge generation layer may include a second n-type charge generation layer 241 and a second p-type charge generation layer 242.

[0130] According to the embodiments of the present specification, the first light-emitting layer 3123 may be a green light-emitting layer, the second light-emitting layer 3223 may be a blue light-emitting layer, and the third light-emitting layer 3323 may be a red light-emitting layer. Since the first to third light-emitting sections are configured with light-emitting layers of different colors, it is possible to solve the problem of reduced efficiency and reduced brightness of the light-emitting layers due to exciton sharing between the two light-emitting sections when two light-emitting sections are configured. For example, when two light-emitting sections are configured, the second light-emitting section may be configured with a junction of a red light-emitting layer and a green light-emitting layer, and the red and green light-emitting layers may share excitons, which may reduce the efficiency of the red and green light-emitting layers and reduce the brightness of the display device.

[0131] FIG. 8 is a diagram showing a display panel according to an embodiment of this specification.

[0132] 8, a display panel 41 according to an embodiment of the present specification may include a first electrode 113, light-emitting layers 4123, 4223, and 4323, and a second electrode 114. In the description of each layer included in the display panel, the same content as that described in FIG. 1 may be omitted or may be simply described.

[0133] A first light-emitting portion, a second light-emitting portion, and a third light-emitting portion may be included between the first electrode 113 and the second electrode 114. The light-emitting layers 4123, 4223, and 4323 included in the first light-emitting portion, the second light-emitting portion, and the third light-emitting portion may emit light of different colors. A capping layer 116 may be further included on the second electrode 114.

[0134] As described in Figures 2A to 4C, Figure 8 shows that the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 385 nm, and the second electrode can be composed of a blue light-emitting layer, a red light-emitting layer, and a green light-emitting layer.

[0135] The first light-emitting unit may include a first common layer 121, a first light-emitting layer 4123, and a second common layer 125. The first common layer 121 and the second common layer 125 are the same as those described with reference to FIGS. 1 and 5, and therefore will not be described here. The first light-emitting layer 4123 may be a green light-emitting layer. For example, the first light-emitting layer 4123 may be composed of at least one host and at least one dopant. For example, the dopant of the first light-emitting layer 4123 may be a green phosphorescent dopant. For example, the dopant of the first light-emitting layer 4123 may have a peak wavelength in the range of 500 nm to 590 nm and may include one or more dopants selected from green, yellow-green, and yellow. For example, the first light-emitting layer 4123 may be disposed 340 nm from the second electrode 114. For example, the first light-emitting layer 4123 may be disposed 340 nm from the bottom surface of the second electrode 114.

[0136] The second light-emitting unit may include a third common layer 221, a second light-emitting layer 4223, and a fourth common layer 225. The third common layer 221 and the fourth common layer 225 are the same as those described with reference to FIGS. 1 and 5, and therefore will not be described here. The second light-emitting layer 4223 may be a red light-emitting layer. For example, the second light-emitting layer 4223 may be composed of at least one host and at least one dopant. For example, the dopant of the second light-emitting layer 4223 may be a red light-emitting dopant. For example, the peak wavelength of the red light-emitting dopant may be in the range of 600 nm to 650 nm. For example, the second light-emitting layer 4223 may be disposed 230 nm from the second electrode 114. For example, the second light-emitting layer 4223 may be disposed 230 nm from the bottom surface of the second electrode 114.

[0137] A first charge generation layer may be disposed between the first light emitting portion and the second light emitting portion, and may include a first n-type charge generation layer 141 and a first p-type charge generation layer 142.

[0138] The third light-emitting unit may include a fifth common layer 321, a third light-emitting layer 4323, and a sixth common layer 325. The fifth common layer 321 and the sixth common layer 325 are the same as those described with reference to FIGS. 1 and 5, and therefore will not be described here. The third light-emitting layer 4323 may be a blue light-emitting layer. For example, the third light-emitting layer 4323 may be composed of at least one host and at least one dopant. For example, the dopant of the third light-emitting layer 4323 may be composed of one or more of a blue fluorescent dopant, a blue phosphorescent dopant, and a delayed fluorescent dopant. The peak wavelength of the blue dopant may be in the range of 420 nm to 480 nm. For example, the third light-emitting layer 4323 may be disposed 35 nm from the second electrode 114. For example, the third light-emitting layer 4323 may be disposed 35 nm from the bottom surface of the second electrode 114.

[0139] A second charge generation layer may be disposed between the second light emitting portion and the third light emitting portion. The second charge generation layer may include a second n-type charge generation layer 241 and a second p-type charge generation layer 242.

[0140] According to the embodiments of the present specification, first light-emitting layer 4123 may be a green light-emitting layer, second light-emitting layer 4223 may be a red light-emitting layer, and third light-emitting layer 4323 may be a blue light-emitting layer. Since the first to third light-emitting sections are each configured with a different color light-emitting layer, it is possible to solve the problem of reduced efficiency and reduced brightness of the light-emitting layers due to exciton sharing between the two light-emitting sections when two light-emitting sections are configured. For example, when two light-emitting sections are configured, the second light-emitting section may be configured with a junction of a red light-emitting layer and a green light-emitting layer, and the red and green light-emitting layers may share excitons, which may reduce the efficiency of the red and green light-emitting layers and reduce the brightness of the display device.

[0141] FIG. 9 is a diagram showing a display panel according to an embodiment of this specification.

[0142] 9, a display panel 51 according to an embodiment of the present specification may include a first electrode 113, light-emitting layers 5123, 5223, and 5323, and a second electrode 114. In the description of each layer included in the display panel, the same content as that described in FIG. 1 may be omitted or may be simply described.

[0143] A first light-emitting portion, a second light-emitting portion, and a third light-emitting portion may be included between the first electrode 113 and the second electrode 114. The light-emitting layers 5123, 5223, and 5323 included in the first light-emitting portion, the second light-emitting portion, and the third light-emitting portion may emit light of different colors. A capping layer 116 may be further included on the second electrode 114.

[0144] As described in Figures 2A to 4C, Figure 9 shows a device in which the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 450 nm, and the second electrode can be composed of a blue light-emitting layer, a red light-emitting layer, and a green light-emitting layer.

[0145] The first light-emitting unit may include a first common layer 121, a first light-emitting layer 5123, and a second common layer 125. The first common layer 121 and the second common layer 125 are the same as those described with reference to FIGS. 1 and 5, and therefore will not be described here. The first light-emitting layer 5123 may be a blue light-emitting layer. For example, the first light-emitting layer 5123 may be composed of at least one host and at least one dopant. For example, the dopant of the first light-emitting layer 5123 may be composed of one or more of a blue fluorescent dopant, a blue phosphorescent dopant, and a delayed fluorescent dopant. The peak wavelength of the blue dopant may be in the range of 420 nm to 480 nm. For example, the first light-emitting layer 5123 may be disposed 405 nm from the second electrode 114. For example, the first light-emitting layer 5123 may be disposed 405 nm from the bottom surface of the second electrode 114.

[0146] The second light-emitting unit may include a third common layer 221, a second light-emitting layer 5223, and a fourth common layer 225. The third common layer 221 and the fourth common layer 225 are the same as those described with reference to FIGS. 1 and 5, and therefore will not be described here. The second light-emitting layer 5223 may be a red light-emitting layer. For example, the second light-emitting layer 5223 may be composed of at least one host and at least one dopant. For example, the dopant of the second light-emitting layer 5223 may be a red phosphorescent dopant. For example, the peak wavelength of the red dopant may be in the range of 600 nm to 650 nm. For example, the second light-emitting layer 5223 may be disposed 230 nm from the second electrode 114. For example, the second light-emitting layer 5223 may be disposed 230 nm from the bottom surface of the second electrode 114.

[0147] A first charge generation layer may be disposed between the first light emitting portion and the second light emitting portion, and may include a first n-type charge generation layer 141 and a first p-type charge generation layer 142.

[0148] The third light-emitting unit may include a fifth common layer 321, a third light-emitting layer 5323, and a sixth common layer 325. The fifth common layer 321 and the sixth common layer 325 are the same as those described with reference to FIGS. 1 and 5, and therefore will not be described here. The third light-emitting layer 5323 may be a green light-emitting layer. For example, the third light-emitting layer 5323 may be composed of at least one host and at least one dopant. For example, the dopant of the third light-emitting layer 5323 may be a green phosphorescent dopant. For example, the dopant of the third light-emitting layer 5323 may have a peak wavelength in the range of 500 nm to 590 nm and may include one or more dopants selected from green, yellow-green, and yellow. For example, the third light-emitting layer 5323 may be disposed 50 nm from the second electrode 114. For example, the third light-emitting layer 5323 may be disposed 50 nm from the bottom surface of the second electrode 114.

[0149] A second charge generation layer may be disposed between the second light emitting portion and the third light emitting portion. The second charge generation layer may include a second n-type charge generation layer 241 and a second p-type charge generation layer 242.

[0150] According to the embodiments of the present specification, first light-emitting layer 5123 may be a blue light-emitting layer, second light-emitting layer 5223 may be a red light-emitting layer, and third light-emitting layer 5323 may be a green light-emitting layer. Since the first to third light-emitting sections are each configured with a different color light-emitting layer, this solves the problem of reduced efficiency and reduced brightness of the light-emitting layers due to exciton sharing between the two light-emitting sections when two light-emitting sections are used. For example, when two light-emitting sections are used, the second light-emitting section may be configured with a junction of a red light-emitting layer and a green light-emitting layer, and the red and green light-emitting layers may share excitons, thereby solving the problem of reduced efficiency and reduced brightness of the display device.

[0151] FIG. 10 is a diagram illustrating a display panel according to an embodiment of the present specification.

[0152] 10, a display panel 61 according to an embodiment of the present specification may include a first electrode 113, light-emitting layers 6123, 6223, and 6323, and a second electrode 114. In the description of each layer included in the display panel, the same content as that described in FIG. 1 may be omitted or may be simply described.

[0153] A first light-emitting portion, a second light-emitting portion, and a third light-emitting portion may be included between the first electrode 113 and the second electrode 114. The light-emitting layers 6123, 6223, and 6323 included in the first light-emitting portion, the second light-emitting portion, and the third light-emitting portion may emit light of different colors. A capping layer 116 may be further included on the second electrode 114.

[0154] As described in Figures 2A to 4C, Figure 10 shows that the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 450 nm, and the second electrode can be composed of a blue light-emitting layer, a green light-emitting layer, and a red light-emitting layer.

[0155] The first light-emitting unit may include a first common layer 121, a first light-emitting layer 6123, and a second common layer 125. The first common layer 121 and the second common layer 125 are the same as those described with reference to FIGS. 1 and 5, and therefore will not be described here. The first light-emitting layer 6123 may be a red light-emitting layer. For example, the first light-emitting layer 6123 may be composed of at least one host and at least one dopant. For example, the dopant of the first light-emitting layer 6123 may be a red light dopant. For example, the peak wavelength of the red light dopant may be in the range of 600 nm to 650 nm. For example, the first light-emitting layer 6123 may be disposed 405 nm from the second electrode 114. For example, the first light-emitting layer 6123 may be disposed 405 nm from the bottom surface of the second electrode 114.

[0156] The second light-emitting portion may include a third common layer 221, a second light-emitting layer 6223, and a fourth common layer 225. The third common layer 221 and the fourth common layer 225 are the same as those described with reference to FIGS. 1 and 5, and therefore will not be described here. The second light-emitting layer 6223 may be a green light-emitting layer. For example, the second light-emitting layer 6223 may be composed of at least one host and at least one dopant. For example, the dopant of the second light-emitting layer 6223 may be a green phosphorescent dopant. For example, the dopant of the second light-emitting layer 6223 may have a peak wavelength of 500 nm to 590 nm and may include one or more dopants selected from green, yellow-green, and yellow. For example, the second light-emitting layer 6223 may be disposed 195 nm from the second electrode 114. For example, the second light-emitting layer 6223 may be disposed 195 nm from the bottom surface of the second electrode 114.

[0157] A first charge generation layer may be disposed between the first light emitting portion and the second light emitting portion, and may include a first n-type charge generation layer 141 and a first p-type charge generation layer 142.

[0158] The third light-emitting unit may include a fifth common layer 321, a third light-emitting layer 6323, and a sixth common layer 325. The fifth common layer 321 and the sixth common layer 325 are the same as those described with reference to FIGS. 1 and 5, and therefore will not be described here. The third light-emitting layer 6323 may be a blue light-emitting layer. For example, the third light-emitting layer 6323 may be composed of at least one host and at least one dopant. For example, the dopant of the third light-emitting layer 6323 may be composed of one or more of a blue fluorescent dopant, a blue phosphorescent dopant, and a delayed fluorescent dopant. The peak wavelength of the blue dopant may be in the range of 420 nm to 480 nm. For example, the third light-emitting layer 6323 may be disposed 35 nm from the second electrode 114. For example, the third light-emitting layer 6323 may be disposed 35 nm from the bottom surface of the second electrode 114.

[0159] A second charge generation layer may be disposed between the second light emitting portion and the third light emitting portion. The second charge generation layer may include a second n-type charge generation layer 241 and a second p-type charge generation layer 242.

[0160] According to the embodiments of the present specification, the first light-emitting layer 6123 may be a red light-emitting layer, the second light-emitting layer 6223 may be a green light-emitting layer, and the third light-emitting layer 6323 may be a blue light-emitting layer. Since the first to third light-emitting sections are each configured with a different color light-emitting layer, it is possible to solve the problem of reduced efficiency and reduced brightness of the light-emitting layers due to exciton sharing between the two light-emitting sections when two light-emitting sections are configured. For example, when two light-emitting sections are configured, the second light-emitting section may be configured with a junction of a red light-emitting layer and a green light-emitting layer, and the red and green light-emitting layers may share excitons, which may reduce the efficiency of the red and green light-emitting layers and reduce the brightness of the display device.

[0161] FIG. 11 is a diagram illustrating a display panel according to an embodiment of the present specification.

[0162] 11, a display panel 71 according to an embodiment of the present specification may include a first electrode 113, light-emitting layers 7123, 7223, and 7323, and a second electrode 114. In the description of each layer included in the display panel, the same content as that described in FIG. 1 may be omitted or may be simply described.

[0163] A first light-emitting portion, a second light-emitting portion, and a third light-emitting portion may be included between the first electrode 113 and the second electrode 114. The light-emitting layers 7123, 7223, and 7323 included in the first light-emitting portion, the second light-emitting portion, and the third light-emitting portion, respectively, may emit different colors. A capping layer 116 may be further included on the second electrode 114. For example, the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 450 nm.

[0164] The first light-emitting unit may include a first common layer 121, a first light-emitting layer 7123, and a second common layer 125. The first common layer 121 and the second common layer 125 are the same as those described with reference to FIGS. 1 and 5, and therefore will not be described here. The first light-emitting layer 7123 may be a red light-emitting layer. For example, the first light-emitting layer 7123 may be composed of at least one host and at least one dopant. For example, the dopant of the first light-emitting layer 7123 may be a red phosphorescent dopant. For example, the peak wavelength of the red dopant may be in the range of 600 nm to 650 nm. For example, the first light-emitting layer 7123 may be disposed 230 nm from the second electrode 114. For example, the first light-emitting layer 7123 may be disposed 230 nm from the bottom surface of the second electrode 114.

[0165] A fourth light-emitting layer 7124 may be further formed on the first light-emitting layer 7123. The fourth light-emitting layer 7124 may be a green light-emitting layer. For example, the fourth light-emitting layer 7124 may be composed of at least one host and at least one dopant. For example, the dopant of the fourth light-emitting layer 7124 may be a green phosphorescent dopant. For example, the dopant of the fourth light-emitting layer 7124 may have a peak wavelength of 500 nm to 590 nm and may include one or more dopants selected from green, yellow-green, and yellow. By further forming the fourth light-emitting layer 7124, the lifetime of the green light-emitting layer may be further improved. Furthermore, by further forming the fourth light-emitting layer 7124, the efficiency of the green light-emitting layer, together with that of the third light-emitting layer 7323, may be further improved.

[0166] The second light-emitting unit may include a third common layer 221, a second light-emitting layer 7223, and a fourth common layer 225. The third common layer 221 and the fourth common layer 225 are the same as those described with reference to FIGS. 1 and 5, and therefore will not be described here. The second light-emitting layer 7223 may be a blue light-emitting layer. For example, the second light-emitting layer 7223 may be composed of at least one host and at least one dopant. For example, the dopant of the second light-emitting layer 7223 may be composed of one or more of a blue fluorescent dopant, a blue phosphorescent dopant, and a delayed fluorescent dopant. The peak wavelength of the blue dopant may be in the range of 420 nm to 480 nm. For example, the second light-emitting layer 7223 may be disposed 155 nm from the second electrode 114. For example, the second light-emitting layer 7223 may be disposed 155 nm from the bottom surface of the second electrode 114.

[0167] A first charge generation layer may be disposed between the first light emitting portion and the second light emitting portion, and may include a first n-type charge generation layer 141 and a first p-type charge generation layer 142.

[0168] The third light-emitting portion may include a fifth common layer 321, a third light-emitting layer 7323, and a sixth common layer 325. The fifth common layer 321 and the sixth common layer 325 are the same as those described with reference to FIGS. 1 and 5, and therefore will not be described here. The third light-emitting layer 7323 may be a green light-emitting layer. For example, the third light-emitting layer 7323 may be composed of at least one host and at least one dopant. For example, the dopant of the third light-emitting layer 7323 may be a green phosphorescent dopant. For example, the dopant of the third light-emitting layer 7323 may have a peak wavelength of 500 nm to 590 nm and may include one or more dopants selected from green, yellow-green, and yellow. For example, the third light-emitting layer 7323 may be disposed 50 nm from the second electrode 114. For example, the third light-emitting layer 7323 may be disposed 50 nm from the bottom surface of the second electrode 114.

[0169] A second charge generation layer may be disposed between the second light emitting portion and the third light emitting portion. The second charge generation layer may include a second n-type charge generation layer 241 and a second p-type charge generation layer 242.

[0170] According to the embodiments of the present specification, the first light-emitting layer 7123 may be a red light-emitting layer, the second light-emitting layer 7223 may be a blue light-emitting layer, and the third light-emitting layer 7323 may be a green light-emitting layer. Since the first to third light-emitting sections each have a different color light-emitting layer, this can solve the problem of reduced efficiency and brightness of the light-emitting layers due to exciton sharing between the two light-emitting sections when two light-emitting sections are used. For example, when two light-emitting sections are used, the second light-emitting section may be configured with a junction of a red light-emitting layer and a green light-emitting layer, which can solve the problem of reduced efficiency and brightness of the display device when the red and green light-emitting layers share excitons. By further configuring a green light-emitting layer (4th light-emitting layer 7124) in the first light-emitting section, the lifespan of the green light-emitting layer can be further improved. By configuring the fourth light-emitting layer 7124 together with the green light-emitting layer of the third light-emitting layer 7323, the efficiency of the green light-emitting layer can be further improved.

[0171] The efficiency, brightness, and DCI superposition ratio for a display device including the display panels of FIGS. 5 to 11 will be described with reference to Tables 1, 2, 3, and 4.

[0172] [Table 1]

[0173] In Table 1, Examples 1 to 6 are configured with display devices including the display panels of FIGS. 5 to 10, and the Purcell effect is applied.

[0174] Referring to Table 1, harmonics indicate the order of light-emitting nodes from the second electrode, as explained in Figures 2A to 4C. For example, in Example 1, the blue light-emitting layer may be the third light-emitting node from the second electrode, the green light-emitting layer may be the second light-emitting node from the second electrode, and the red light-emitting layer may be the first light-emitting node from the second electrode.

[0175] In Examples 1 and 2, the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 310 nm. In Example 2, the blue light-emitting layer may be the second light-emitting node from the second electrode, the green light-emitting layer may be the first light-emitting node from the second electrode, and the red light-emitting layer may be the second light-emitting node from the second electrode. For example, Example 1 may be configured with a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer from the second electrode. For example, Example 2 may be configured with a green light-emitting layer, a blue light-emitting layer, and a red light-emitting layer from the second electrode.

[0176] In terms of efficiency, Example 1 has the green light-emitting layer disposed at the most efficient node, and the red and blue light-emitting layers disposed at the second most efficient node, which can improve efficiency compared to Example 2. Example 2 has the blue and red light-emitting layers disposed at the most efficient node, and the green light-emitting layer disposed at the second most efficient node, which results in a lower green efficiency compared to Example 1. For example, it can be seen that the efficiency of Example 1 is 44.2 cd / A, and the efficiency of Example 2 is 35.6 cd / A.

[0177] In terms of brightness, it can be seen that Example 2 is better than Example 1. This is because when achieving white efficiency, differences in blue efficiency can cause brightness differences. For example, it can be seen that the brightness of Example 1 is 7210 nits, and the brightness of Example 2 is 7930 nits.

[0178] In Examples 3 and 4, the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 385 nm. In Example 3, the blue light-emitting layer may be the second light-emitting node from the second electrode, the green light-emitting layer may be the third light-emitting node from the second electrode, and the red light-emitting layer may be the first light-emitting node from the second electrode. In Example 4, the blue light-emitting layer may be the first light-emitting node from the second electrode, the green light-emitting layer may be the third light-emitting node from the second electrode, and the red light-emitting layer may be the second light-emitting node from the second electrode. For example, Example 3 may be configured with a red light-emitting layer, a blue light-emitting layer, and a green light-emitting layer from the second electrode. For example, Example 4 may be configured with a blue light-emitting layer, a red light-emitting layer, and a green light-emitting layer from the second electrode.

[0179] In terms of efficiency, in Example 3, the blue light-emitting layer may be disposed at the most efficient node, and the green and red light-emitting layers may be disposed at the second most efficient node. In Example 4, the red light-emitting layer may be disposed at the most efficient node, the green light-emitting layer may be disposed at the second most efficient node, and the blue light-emitting layer may be disposed at the third most efficient node. It can be seen that the efficiency differs depending on the positions of the blue and red light-emitting layers at the most efficient nodes. Due to the Purcell effect, the closer the light-emitting layer is disposed to the second electrode, the lower the efficiency of the light-emitting layer. For example, in Example 3, the red light-emitting layer is disposed closer to the second electrode than the blue light-emitting layer, so the red efficiency may be lower. Therefore, in Example 3, the efficiency of the middle blue light-emitting layer may be improved compared to the red light-emitting layer closest to the second electrode. In Example 4, the blue light-emitting layer is disposed closer to the second electrode than the red light-emitting layer, so the blue efficiency may be lower. Therefore, in Example 4, the efficiency of the middle red light-emitting layer may be improved more than the blue light-emitting layer closest to the second electrode. Comparing Examples 3 and 4, we can see that the overall efficiency is higher when the red light-emitting layer is located in a high-efficiency position, i.e., far from the second electrode. This is because the efficiency of the red light-emitting layer contributes significantly to the overall efficiency. For example, the efficiency of Example 3 is 34.7 cd / A, and the efficiency of Example 4 is 37.7 cd / A.

[0180] With respect to brightness, it can be seen that Example 3 is superior to Example 4. For example, it can be seen that Example 3 has a further improvement in brightness compared to Example 4. This is because when realizing white efficiency, differences in blue efficiency can cause differences in brightness. For example, it can be seen that the brightness of Example 3 is 6440 nits, and the brightness of Example 4 is 5590 nits.

[0181] In Examples 5 and 6, the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 450 nm. In Example 5, the blue light-emitting layer may be the fourth light-emitting node from the second electrode, the green light-emitting layer may be the first light-emitting node from the second electrode, and the red light-emitting layer may be the second light-emitting node from the second electrode. In Example 6, the blue light-emitting layer may be the first light-emitting node from the second electrode, the green light-emitting layer may be the second light-emitting node from the second electrode, and the red light-emitting layer may be the third light-emitting node from the second electrode. For example, Example 5 may be configured with a green light-emitting layer, a red light-emitting layer, and a blue light-emitting layer from the second electrode. For example, Example 6 may be configured with a blue light-emitting layer, a green light-emitting layer, and a red light-emitting layer from the second electrode.

[0182] In terms of efficiency, in Example 5, the red light-emitting layer may be located at the most efficient node, and the green and blue light-emitting layers may be located at the third most efficient node. In Example 6, the green light-emitting layer may be located at the most efficient node, the red light-emitting layer may be located at the second most efficient node, and the blue light-emitting layer may be located at the fourth most efficient node. It can be seen that the efficiency differs depending on the positions of the green and red light-emitting layers at the efficient nodes. Due to the Purcell effect, the closer the light-emitting layer is located to the second electrode, the lower the efficiency of the light-emitting layer. For example, in Examples 5 and 6, the green light-emitting layer is located closer to the second electrode than the red light-emitting layer, which may improve red efficiency. On the other hand, in Example 5, the green and red light-emitting layers are located closer to the second electrode than the blue light-emitting layer, which may reduce red efficiency. In contrast, in Example 6, the blue light-emitting layer is located closer to the second electrode than the green and red light-emitting layers, which may improve red efficiency. Comparing Examples 5 and 6, it can be seen that the overall efficiency is higher when the red light-emitting layer is located at a highly efficient position, i.e., farther from the second electrode. This is because the efficiency of the red light-emitting layer contributes greatly to the overall efficiency. For example, it can be seen that the efficiency of Example 5 is 32.5 cd / A, and the efficiency of Example 6 is 35.4 cd / A.

[0183] Regarding efficiency, as the distance between the first and second electrodes or the thickness of the layer between the first and second electrodes increases, the efficiency of blue and green may decrease, and the efficiency of red may increase and then decrease. For example, in Examples 1 and 5, in which a blue light-emitting layer is configured in the first light-emitting portion, it can be seen that Example 1 has improved efficiency compared to Example 5.

[0184] Regarding brightness, it can be seen that Example 5 has improved brightness compared to Example 6. This is because when achieving white efficiency, differences in blue efficiency can cause differences in brightness. For example, it can be seen that the brightness of Example 5 is 5940 nits, and the brightness of Example 6 is 5580 nits.

[0185] Display devices are required to meet the DCI color gamut, which is approximately 130% wider than the conventional sRGB, for clearer and more realistic display. DCI is an RGB color space and can be considered a color gamut that represents a wider color gamut than sRGB. sRGB is a standard color space created by HP and Microsoft in 1996 with lower standards than the standard RGB. Color gamut can also be referred to as color gamut, color region, color reproduction range, or color gamut. The overlap ratio can be considered the range where the DCI and display device color gamuts overlap. The DCI overlap ratio can be considered DCI color gamut satisfaction.

[0186] With respect to the DCI overlap ratio, it can be seen that Examples 1 and 2 exhibit similar levels. It can be seen that the DCI overlap ratio decreases as the distance between the first electrode and the second electrode or the layer thickness between the first electrode and the second electrode increases. For example, it can be seen that the DCI overlap ratio of Examples 1 and 2 is 99.7%. It can be seen that the DCI overlap ratios of Examples 3 and 4 are nearly similar. For example, it can be seen that the DCI overlap ratio of Example 3 is 99.0%, and the DCI overlap ratio of Example 4 is 99.1%. It can be seen that the DCI overlap ratios of Examples 5 and 6 are nearly similar. For example, it can be seen that the DCI overlap ratio of Example 5 is 97.3%, and the DCI overlap ratio of Example 6 is 97.0%.

[0187] According to the examples of the present specification, the efficiency may vary depending on the distance between the first electrode and the second electrode, the thickness of the layer between the first electrode and the second electrode, and the position of the light-emitting layer, but the efficiency may be improved as the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is smaller. For example, it can be seen that Example 1 has improved efficiency compared to Examples 2 to 6. The efficiency when configured with two light-emitting units is 22 cd / A, and it can be seen that the efficiency of the display device according to the examples of the present specification is even higher than when configured with two light-emitting units.

[0188] According to the examples of the present specification, it can be seen that Example 2 has improved brightness compared to other examples. The brightness when configured with two light-emitting units is 5000 nits, and it can be seen that the display device according to the examples of the present specification has even better brightness than when configured with two light-emitting units. For example, it can be seen that when configured with three light-emitting units, even if the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is increased, the brightness is improved compared to when configured with two light-emitting units. For example, it can be seen that when configured with three light-emitting units, even if the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is increased, the brightness is still improved compared to when configured with two light-emitting units when the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 310 nm to 450 nm.

[0189] According to the examples of the present specification, if the efficiency of the blue light-emitting layer is further improved, the brightness can be further improved. For example, if the blue light-emitting layer is composed of a phosphorescent or delayed fluorescent dopant, a display device having a brightness of 9,000 nit to 10,000 nit can be provided.

[0190] According to the examples of the present specification, it can be seen that the brightness and DCI superposition ratio improve as the distance between the first and second electrodes or the thickness of the layer between the first and second electrodes decreases. For example, it can be seen that when a device is configured with three light-emitting units, even if the distance between the first and second electrodes or the thickness of the layer between the first and second electrodes increases, the DCI superposition ratio is improved compared to when a device is configured with two light-emitting units. For example, the DCI superposition ratio when a device is configured with two light-emitting units is 99.0%, and it can be seen that Examples 1 to 4 have even higher DCI superposition ratios than when a device is configured with two light-emitting units.

[0191] Table 2 shows the TiN factor, efficiency, and color coordinates of Examples 1 to 6.

[0192] [Table 2]

[0193] In Table 2, Examples 1 to 6 are configured with display devices including the display panels of FIGS. 5 to 10, with color filter layers and the Purcell effect applied. Furthermore, TiN is used as the first electrode. When TiN is used as the first electrode, brightness can be improved compared to when a transparent electrode is used as the first electrode. For example, TiN can absorb more light in the visible light range than ITO, so this can vary depending on the distance between the TiN first electrode and the first layer. For example, the thicker the first layer, the more visible light can be absorbed.

[0194] For example, in Table 2, the TiN factor may be (panel efficiency when TiN is applied) / (panel efficiency when ITO is applied). The TiN factor may be a value calculated by simulation. For example, the closer the TiN factor is to 1, the smaller the light absorption, and therefore the higher the efficiency and brightness. For example, it can be seen that in Examples 1 and 2, the blue TiN factor is 0.88, the green TiN factor is 0.76, and the red TiN factor is 1. For example, in Examples 1 and 2, the blue and green efficiencies may be improved.

[0195] The efficiency in Table 2 may be the panel efficiency. For example, the panel efficiency can be calculated by applying the TiN factor to the RGB efficiency of the ITO electrode, which is the first electrode.

[0196] With respect to the efficiencies, it can be seen that the blue efficiency of Example 1 is 2.96 cd / A, the green efficiency is 126 cd / A, and the red efficiency is 33.8 cd / A. It can be seen that the blue efficiency of Example 2 is 4.33 cd / A, the green efficiency is 86.7 cd / A, and the red efficiency is 37.2 cd / A. It can be seen that the blue efficiency of Example 2 is greater than that of Example 1. It can be seen that the green efficiency of Example 2 is greater than that of Example 1. It can be seen that the red efficiency of Example 2 is greater than that of Example 1. For example, it can be seen that Example 1 has improved blue and green efficiencies compared to Example 2.

[0197] Referring to the color coordinates, it can be seen that in Example 1, the color coordinates (x, y) of blue are (0.149, 0.038), the color coordinates (x, y) of green are (0.242, 0.713), and the color coordinates (x, y) of red are (0.680, 0.317). In Example 2, the color coordinates (x, y) of blue are (0.149, 0.038), the color coordinates (x, y) of green are (0.241, 0.714), and the color coordinates (x, y) of red are (0.681, 0.316). For example, it can be seen that the color coordinates of blue, green, and red in Example 1 and Example 2 are similar.

[0198] With respect to the TiN factors, it can be seen that the TiN factors of the blue light-emitting layer are 0.74, the green light-emitting layer are 0.99, and the red light-emitting layer are 0.60 in Examples 3 and 4. For example, green efficiency can be improved in Examples 3 and 4.

[0199] With respect to the efficiencies, it can be seen that the blue efficiency of Example 3 is 3.92 cd / A, the green efficiency is 82.1 cd / A, and the red efficiency is 32.8 cd / A. It can be seen that the blue efficiency of Example 4 is 2.91 cd / A, the green efficiency is 83.3 cd / A, and the red efficiency is 46.9 cd / A. It can be seen that the blue efficiency of Example 3 is greater than that of Example 4. It can be seen that the green efficiency of Example 4 is greater than that of Example 3. It can be seen that the red efficiency of Example 4 is greater than that of Example 3. For example, it can be seen that the green and red efficiencies of Example 4 are improved compared to Example 3.

[0200] With reference to the color coordinates, in Example 3, the blue color coordinates (x, y) are (0.150, 0.037), the green color coordinates (x, y) are (0.231, 0.715), and the red color coordinates (x, y) are (0.678, 0.315). In Example 4, the blue color coordinates (x, y) are (0.147, 0.043), the green color coordinates (x, y) are (0.230, 0.714), and the red color coordinates (x, y) are (0.677, 0.316). For example, the green and red color coordinates of Example 3 and Example 4 are similar, and the blue color coordinates of Example 3 are wider than those of Example 4.

[0201] With reference to the TiN factors, it can be seen that in Examples 5 and 6, the TiN factor of the blue light-emitting layer is 0.88, the TiN factor of the green light-emitting layer is 0.76, and the TiN factor of the red light-emitting layer is 1. For example, Examples 5 and 6 can improve red efficiency.

[0202] With respect to the efficiencies, it can be seen that the blue efficiency of Example 5 is 3.07 cd / A, the green efficiency is 65.0 cd / A, and the red efficiency is 45.4 cd / A. It can be seen that the blue efficiency of Example 6 is 2.78 cd / A, the green efficiency is 97.6 cd / A, and the red efficiency is 29.4 cd / A. It can be seen that the blue efficiency of Example 5 is greater than that of Example 6. It can be seen that the green efficiency of Example 6 is greater than that of Example 5. It can be seen that the red efficiency of Example 5 is greater than that of Example 6. For example, it can be seen that Example 6 has improved green efficiency compared to Example 5. For example, it can be seen that Example 5 has improved blue and red efficiencies compared to Example 6.

[0203] With reference to the color coordinates, it can be seen that in Example 5, the blue color coordinates (x, y) are (0.150, 0.046), the green color coordinates (x, y) are (0.172, 0.704), and the red color coordinates (x, y) are (0.681, 0.318). In Example 6, the blue color coordinates (x, y) are (0.147, 0.050), the green color coordinates (x, y) are (0.170, 0.701), and the red color coordinates (x, y) are (0.681, 0.318). For example, it can be seen that the green and red color coordinates of Example 5 and Example 6 are similar, and the blue color coordinate of Example 5 is wider than the blue color coordinate of Example 6.

[0204] According to the embodiments of the present specification, when TiN is used for the first electrode, the efficiency can be further improved, so that a display device with improved efficiency and brightness can be provided.

[0205] Table 3 shows the measured efficiency when the distance between the first and second electrodes or the thickness of the layer between the first and second electrodes was set to 310 nm in Examples 1 to 6. The efficiency in Table 3 may be the panel efficiency. For example, the panel efficiency can be calculated by applying the TiN factor to the RGB efficiency of the ITO electrode, which is the first electrode.

[0206] In Examples 1 to 6, the efficiency was measured when the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode was small.

[0207] [Table 3]

[0208] In Table 3, Examples 1, 2, and 8 to 11 are configured with display devices including the display panels of FIGS. 5 to 11, and are configured with color filter layers, but the Purcell effect is not applied. For example, since it is difficult to fabricate the light-emitting elements or display panels, measurements were made without applying the Purcell effect. In addition, TiN was applied to the first electrode.

[0209] For example, in Table 3, the TiN factor can be (panel efficiency when TiN is applied) / (panel efficiency when ITO is applied). For example, in Examples 1, 2, and 8 to 11, the TiN factor of the red light-emitting layer is 1, the TiN factor of the blue light-emitting layer is 0.88, and the TiN factor of the green light-emitting layer is 0.76.

[0210] The explanation of harmonics is the same as that in Tables 1 and 2, so the explanation will be omitted here or will be given briefly.

[0211] Example 1 can be configured with a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer from the second electrode, as described in Table 1. For example, Example 1 can be configured with a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer from the second electrode. For example, the red light-emitting layer can be arranged 55 nm from the second electrode, the green light-emitting layer can be arranged 195 nm from the second electrode, and the blue light-emitting layer can be arranged 275 nm from the second electrode. Example 2 can be configured with a green light-emitting layer, a blue light-emitting layer, and a red light-emitting layer from the second electrode, since the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 310 nm. For example, Example 2 can be configured with a green light-emitting layer, a blue light-emitting layer, and a red light-emitting layer from the second electrode, because the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 310 nm. For example, Example 2 can be configured with a green light-emitting layer 50 nm from the second electrode, the blue light-emitting layer 155 nm from the second electrode, and the red light-emitting layer 230 nm from the second electrode.

[0212] With reference to the efficiencies, it can be seen that the blue efficiency of Example 1 is 4.20 cd / A, the green efficiency is 89.0 cd / A, and the red efficiency is 33.8 cd / A. It can be seen that the blue efficiency of Example 2 is 4.33 cd / A, the green efficiency is 86.7 cd / A, and the red efficiency is 37.2 cd / A. It can be seen that the blue efficiency of Example 2 is greater than that of Example 1. It can be seen that the green efficiency of Example 1 is greater than that of Example 2. It can be seen that the red efficiency of Example 2 is greater than that of Example 1. For example, it can be seen that Example 1 has a more improved green efficiency than Example 2. For example, it can be seen that Example 2 has more improved blue and red efficiencies than Example 1.

[0213] Referring to the color coordinates, it can be seen that in Example 1, the color coordinates (x, y) of blue are (0.149, 0.038), the color coordinates (x, y) of green are (0.242, 0.713), and the color coordinates (x, y) of red are (0.680, 0.317). In Example 2, the color coordinates (x, y) of blue are (0.149, 0.038), the color coordinates (x, y) of green are (0.241, 0.714), and the color coordinates (x, y) of red are (0.681, 0.316). For example, it can be seen that the color coordinates of blue, green, and red in Example 1 and Example 2 are similar.

[0214] In Example 8, the blue light-emitting layer may be the second light-emitting node from the second electrode, the green light-emitting layer may be the second light-emitting node from the second electrode, and the red light-emitting layer may be the first light-emitting node from the second electrode. For example, Example 8 may be configured with a red light-emitting layer, a blue light-emitting layer, and a green light-emitting layer from the second electrode. For example, in Example 8, the red light-emitting layer may be disposed 55 nm from the second electrode, the blue light-emitting layer may be disposed 155 nm from the second electrode, and the green light-emitting layer may be disposed 195 nm from the second electrode. In Example 9, the blue light-emitting layer may be the first light-emitting node from the second electrode, the green light-emitting layer may be the second light-emitting node from the second electrode, and the red light-emitting layer may be the first light-emitting node from the second electrode. For example, Example 9 may be configured with a blue light-emitting layer, a red light-emitting layer, and a green light-emitting layer from the second electrode. For example, the blue light-emitting layer may be disposed 35 nm from the second electrode, the red light-emitting layer may be disposed 55 nm from the second electrode, and the green light-emitting layer may be disposed 195 nm from the second electrode.

[0215] With respect to the efficiencies, it can be seen that the blue efficiency of Example 8 is 4.30 cd / A, the green efficiency is 89.8 cd / A, and the red efficiency is 33.9 cd / A. It can be seen that the blue efficiency of Example 9 is 4.13 cd / A, the green efficiency is 91.1 cd / A, and the red efficiency is 33.9 cd / A. It can be seen that the blue efficiency of Example 8 is greater than that of Example 9. It can be seen that the green efficiency of Example 9 is greater than that of Example 8. It can be seen that the red efficiency of Example 8 is the same as that of Example 9. For example, it can be seen that the green efficiency of Example 9 is improved compared to Example 8. For example, it can be seen that the blue efficiency of Example 8 is improved compared to Example 9.

[0216] Referring to the color coordinates, it can be seen that in Example 8, the color coordinates (x, y) of blue are (0.148, 0.038), the color coordinates (x, y) of green are (0.244, 0.712), and the color coordinates (x, y) of red are (0.681, 0.315). In Example 9, the color coordinates (x, y) of blue are (0.149, 0.037), the color coordinates (x, y) of green are (0.241, 0.713), and the color coordinates (x, y) of red are (0.680, 0.316). For example, it can be seen that the color coordinates of blue, green, and red in Example 8 and Example 9 are similar.

[0217] In Example 10, the blue light-emitting layer may be the third light-emitting node from the second electrode, the green light-emitting layer may be the first light-emitting node from the second electrode, and the red light-emitting layer may be the second light-emitting node from the second electrode. For example, Example 10 may be configured with a green light-emitting layer, a red light-emitting layer, and a blue light-emitting layer from the second electrode. For example, the green light-emitting layer may be disposed 50 nm, the red light-emitting layer may be disposed 230 nm, and the blue light-emitting layer may be disposed 275 nm from the second electrode. In Example 11, the blue light-emitting layer may be the first light-emitting node from the second electrode, the green light-emitting layer may be the second light-emitting node from the second electrode, and the red light-emitting layer may be the second light-emitting node from the second electrode. For example, Example 11 may be configured with a blue light-emitting layer, a green light-emitting layer, and a red light-emitting layer from the second electrode. For example, the green light-emitting layer may be disposed 35 nm, the blue light-emitting layer may be disposed 195 nm, and the red light-emitting layer may be disposed 230 nm from the second electrode.

[0218] With respect to the efficiency, it can be seen that the blue efficiency of Example 10 is 4.27 cd / A, the green efficiency is 86.0 cd / A, and the red efficiency is 37.2 cd / A. It can be seen that the blue efficiency of Example 11 is 4.10 cd / A, the green efficiency is 91.0 cd / A, and the red efficiency is 34.1 cd / A. It can be seen that the blue efficiency of Example 10 is greater than that of Example 11. It can be seen that the green efficiency of Example 11 is greater than that of Example 10. It can be seen that the red efficiency of Example 10 is greater than that of Example 11. For example, it can be seen that Example 10 has improved blue and red efficiencies compared to Example 11. For example, it can be seen that Example 11 has improved green efficiency compared to Example 10.

[0219] With reference to the color coordinates, it can be seen that in Example 10, the color coordinates (x, y) of blue are (0.149, 0.039), the color coordinates (x, y) of green are (0.240, 0.713), and the color coordinates (x, y) of red are (0.681, 0.316). In Example 11, the color coordinates (x, y) of blue are (0.149, 0.037), the color coordinates (x, y) of green are (0.240, 0.714), and the color coordinates (x, y) of red are (0.681, 0.315). For example, it can be seen that the color coordinates of blue, green, and red in Examples 10 and 11 are similar.

[0220] Referring to Table 3, when Example 1 and / or Example 2 are compared with Examples 8 to 11, the following is found: For example, Example 1 shows a more improved green efficiency than Example 2. For example, Example 2 shows a more improved blue and red efficiency than Example 1.

[0221] It can be seen that Example 8 has improved blue and green efficiency compared to Example 1. For example, it can be seen that Example 8 has improved green efficiency compared to Example 2.

[0222] It can be seen that Example 8 has improved blue and green efficiency compared to Example 1. For example, it can be seen that Example 8 has improved blue and green efficiency compared to Example 2. The blue light-emitting layer in Example 8 can be disposed 155 nm from the second electrode, and the green light-emitting layer can be disposed 195 nm from the second electrode. Therefore, in Example 8, the blue light-emitting layer and the green light-emitting layer are disposed close to each other, which can make it difficult to fabricate a display panel or a light-emitting device. However, it can be seen that Example 8 makes it easy to fabricate a display panel or a light-emitting device when the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 385 nm.

[0223] It can be seen that Example 9 has improved green efficiency compared to Example 1. For example, it can be seen that Example 9 has improved green efficiency compared to Example 2. In Example 9, the blue light-emitting layer can be disposed 35 nm from the second electrode, and the red light-emitting layer can be disposed 55 nm from the second electrode. Therefore, in Example 9, the blue light-emitting layer and the red light-emitting layer are disposed close to each other, which can make it difficult to fabricate a display panel or a light-emitting device. However, in Example 9, it can be seen that fabrication of a display panel or a light-emitting device is easy when the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is configured to be 385 nm.

[0224] It can be seen that Example 10 exhibits improved blue efficiency compared to Example 1. It can be seen that Example 11 exhibits improved green efficiency compared to Example 1. For example, it can be seen that Example 11 exhibits improved green efficiency compared to Example 2. In Example 10, the red light-emitting layer can be disposed 230 nm from the second electrode, and the blue light-emitting layer can be disposed 275 nm from the second electrode. Therefore, in Example 10, the red light-emitting layer and the blue light-emitting layer are disposed close to each other, which can make it difficult to fabricate a display panel or a light-emitting device. Therefore, in Example 10, when the distance between the first electrode and the second electrode or the layer thickness between the first electrode and the second electrode is 450 nm, it can be seen that fabrication of a display panel or a light-emitting device is easy. In Example 11, the green light-emitting layer can be disposed 195 nm from the second electrode, and the red light-emitting layer can be disposed 230 nm from the second electrode. Therefore, in Example 11, the green light-emitting layer and the red light-emitting layer are disposed close to each other, which can make it difficult to fabricate a display panel or a light-emitting device. Therefore, in Example 11, it can be seen that when the distance between the first electrode and the second electrode or the layer thickness between the first electrode and the second electrode is set to 450 nm, it is easy to manufacture the display panel or the light-emitting element.

[0225] Table 4 shows the measured efficiency of Experimental Example, Example 1, and Example 7.

[0226] [Table 4]

[0227] In Table 4, the experimental examples are configured with two light-emitting sections, the first of which is configured with a blue light-emitting layer, and the second of which is configured with a red light-emitting layer and a green light-emitting layer on top of the red light-emitting layer. Example 1 is configured with the display panel of Figure 5, and Example 7 is configured with the display panel of Figure 11. ITO is used for the first electrode.

[0228] With respect to the efficiency, it can be seen that the efficiency of Examples 1 and 7 is improved compared to the experimental examples. For example, the red efficiency (R efficiency) is 100% for the experimental example, 200% for Example 1, and 180% for Example 7. For example, the green efficiency (G efficiency) is 100% for the experimental example, 160% for Example 1, and 180% for Example 7. This shows that the red efficiency is further improved by further configuring a green light-emitting layer in the first light-emitting section. For example, the blue efficiency (B efficiency) is 100% for the experimental example, 100% for Example 1, and 100% for Example 7. For example, the white efficiency (W efficiency) is 100% for the experimental example, 133% for Example 1, and 133% for Example 7. This shows that the white efficiency is further improved by configuring three light-emitting sections compared to the experimental example configured with two light-emitting sections.

[0229] Figure 12 shows an emission spectrum according to another example of the present specification. Figure 13 shows an emission spectrum according to an example of the present specification. Figure 14 shows an emission spectrum according to an example of the present specification.

[0230] 12 to 14, the horizontal axis represents the wavelength of light (nm), and the vertical axis represents the emission intensity (intensity). The emission intensity is a normalized value relative to the maximum value of the emission spectrum.

[0231] The electroluminescence spectra of FIGS. 12 to 14 are obtained by applying the display panel of FIG. 6 to the display device of FIG. 1, and by applying a color filter layer and the Purcell effect.

[0232] Referring to FIG. 12, the emission spectrum of the blue light-emitting layer is shown. It can be seen that the blue light-emitting layer exhibits an emission peak at a wavelength of 420 nm to 480 nm. Referring to FIG. 13, it can be seen that the green light-emitting layer exhibits an emission peak at a wavelength of 500 nm to 590 nm. Referring to FIG. 14, it can be seen that the red light-emitting layer exhibits an emission peak at a wavelength of 600 nm to 650 nm. For example, it can be seen that the emission intensity of the red light-emitting layer is improved compared to the emission intensities of the blue and green light-emitting layers. For example, since the emission peaks of the green and red light-emitting layers do not overlap, a display device with improved brightness and efficiency can be provided.

[0233] Table 5 shows the voltage, efficiency, quantum efficiency, and color coordinates of the display devices of Figures 12 to 14. Table 5 shows the voltage, efficiency, quantum efficiency, and color coordinates of the display devices of Figures 12 to 14 when the current density (J) is 10 mA / cm 2 The first electrode was made of ITO.

[0234] [Table 5]

[0235] In Table 5, the voltage (V) is 10.00 V for the blue light-emitting layer, 10.03 V for the green light-emitting layer, and 10.06 V for the red light-emitting layer. The blue efficiency is 4.90 cd / A, the green efficiency is 88.31 cd / A, and the red efficiency is 49.24 cd / A. For example, in the case of two light-emitting elements, the blue efficiency was measured as 15 cd / A, the green efficiency was 59 cd / A, and the red efficiency was 4 cd / A. Therefore, in the case of a three-light-emitting element configuration, the green efficiency is approximately 1.5 times higher and the red efficiency is 12.5 times higher than in the case of a two-light-emitting element configuration. According to the examples of this specification, it can be seen that the green and red efficiencies are improved by using three light-emitting elements.

[0236] Quantum efficiency is the luminous efficiency when light is emitted from the light emitting element (or display panel). It can be seen that the quantum efficiency of blue is 11.53%, that of green is 20.44%, and that of red is 38.76%.

[0237] Referring to the color coordinates (CIE (x, y)), it can be seen that blue is (0.148, 0.043), green is (0.259, 0.674), and red is (0.689, 0.310). In the case of standard color coordinates, blue is (0.142, 0.052), green is (0.272, 0.591), and red is (0.641, 0.327), and it can be seen that the color coordinates of green and red of the display device according to the embodiment of this specification are wider.

[0238] According to the Examples of the present specification, when the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 310 nm, the efficiency of Examples 1 and 2 can be further improved than the efficiency of Examples 3 to 6. When the second electrode is configured from a green light-emitting layer, a blue light-emitting layer, and a red light-emitting layer as in Example 2, the brightness can be further improved than when the second electrode is configured from a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer as in Example 1.

[0239] According to the examples of the present specification, when the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 310 nm, the second electrode can be configured with a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer. According to the examples of the present specification, when the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 310 nm, the second electrode can be configured with a green light-emitting layer, a blue light-emitting layer, and a red light-emitting layer. When the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 310 nm and three light-emitting units are used, the brightness can be further improved compared to when two light-emitting units are used.

[0240] According to the examples of the present specification, when the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 385 nm, the second electrode can be configured with a red light-emitting layer, a blue light-emitting layer, and a green light-emitting layer. In this configuration, blue efficiency can be improved more than when the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 310 nm. When the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 385 nm and three light-emitting units are configured, brightness can be further improved more than when two light-emitting units are configured.

[0241] According to the examples of the present specification, when the distance between the first electrode and the second electrode or the layer thickness between the first electrode and the second electrode is 385 nm, the second electrode can be configured with a blue light-emitting layer, a red light-emitting layer, and a green light-emitting layer. In this configuration, red efficiency can be improved compared to when the distance between the first electrode and the second electrode or the layer thickness between the first electrode and the second electrode is 310 nm. When the distance between the first electrode and the second electrode or the layer thickness between the first electrode and the second electrode is 385 nm and three light-emitting sections are configured, brightness can be further improved compared to when two light-emitting sections are configured.

[0242] According to the examples of the present specification, when the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 450 nm, the second electrode can be configured with a green light-emitting layer, a red light-emitting layer, and a blue light-emitting layer. In this configuration, blue and red efficiency can be improved compared to when the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 310 nm. When the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 450 nm and three light-emitting units are configured, brightness can be further improved compared to when two light-emitting units are configured.

[0243] According to the examples of the present specification, when the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 450 nm, the second electrode can be configured with a blue light-emitting layer, a green light-emitting layer, and a red light-emitting layer. In this configuration, green efficiency can be improved more than when the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 310 nm. When the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode is 450 nm and three light-emitting units are configured, brightness can be further improved more than when two light-emitting units are configured.

[0244] Therefore, the display device according to the embodiments of the present specification can provide a display panel or a display device including a light-emitting element with improved brightness and efficiency by configuring the position of the light-emitting layer according to the distance between the first electrode and the second electrode or the thickness of the layer between the first electrode and the second electrode. Furthermore, the display device according to the embodiments of the present specification can provide a display device including a display panel or a light-emitting element with improved brightness and efficiency by configuring three light-emitting units. Furthermore, the display device according to the embodiments of the present specification can be applied to display devices that require high brightness and high resolution. For example, the display device according to the embodiments of the present specification can be applied to virtual reality and / or augmented reality.

[0245] Fig. 15 is a perspective view of a display device according to another embodiment of the present specification, and Fig. 16 is a top view of a display device according to another embodiment of the present specification.

[0246] 15 and 16, a display device 1000 according to another embodiment of the present disclosure may be configured in a band type so that virtual reality can be viewed.

[0247] The display panel may be separated into a first display panel 510 and a second display panel 520. A storage structure 550 may store the first display panel 510 and the second display panel 520. For example, the first display panel 510 and the second display panel 520 may correspond to the left eye (LE) and the right eye (RE) of a viewer, respectively. For example, the storage structure 550 may store the first display panel 510 and the second display panel 520 corresponding to both eyes (LE, RE) of a viewer, respectively, on the inner side of the display device 1000.

[0248] The first and second lens units 450a and 450b may be provided between the first and second display panels 510 and 520 and the viewer's eyes (LE and RE) to focus images onto the viewer's eyes. For example, the first lens unit 450a may be disposed between the first display panel 510 and the viewer's left eye (LE). The first lens unit 450a may focus images onto the viewer's left eye (LE). For example, the second lens unit 450b may be disposed between the second display panel 520 and the viewer's right eye (RE). The second lens unit 450b may focus images onto the viewer's right eye (RE).

[0249] In this case, the display device 1000 moves along with the viewer's head movement, so the vertical distance (D1) between the first and second display panels 510, 520 and the viewer's eyes (LE, RE) can be the same regardless of the viewer's movement.

[0250] Therefore, when the left eye (LE) looks at the first display panel 510 and the right eye (RE) looks at the second display panel 520, the viewpoints are fixed, so that the left eye (LE) and right eye (RE) can view the images displayed on the first and second display panels 510 and 520 without any viewing angle deviation.

[0251] Fig. 17 is a perspective view of a display device according to another embodiment of the present specification, and Fig. 18 is a diagram showing the relationship between the display device of Fig. 17 and the viewer's eyes.

[0252] 17 and 18, a display device 3000 according to another embodiment of the present specification may be configured to support augmented reality. For example, the display device may have transparent lens units 610 and 620 in front of the eyes (LE and RE) to enable the user to view the external environment, and may be configured with a glasses-type outer shell, but is not limited thereto. For example, even if the display device is in the form of a helmet or band, the transparent lens units 610 and 620 may be provided in front of the eyes, enabling the user to view the external environment and experience augmented reality. For example, the display device 3000 according to another embodiment of the present specification may be a head-mounted display device.

[0253] A display device 3000 according to another embodiment of this specification may include a transparent lens unit and a housing structure 650. The transparent lens unit may include a first transparent lens 610 and a second transparent lens 620 separated in front of the viewer's eyes (LE, RE). The housing structure 650 may encase the first and second transparent lenses 610, 620 in the form of a frame 630. For example, the housing structure 650 may be shaped so as to be worn on both sides of the viewer's eyes (LE, RE) and over the viewer's ears.

[0254] The housing structure may include a display panel 640a and an image transfer unit 640. The display panel 640a may be positioned at the same diagonal distance (D2) on both sides of the viewer's eyes (LE, RE). The image transfer unit 640 may include a mirror reflector 640b that can transfer images from the display panel 640a to the first and second transparent lenses 610 and 620.

[0255] 15 to 18, the first display panel 510 and the second display panel 520 may be configured to correspond to the left eye (LE) and right eye (RE) sides of the viewer of each storage structure 550. The first mirror reflector and the second mirror reflector can reflect images emitted from the first display panel 510 and the second display panel 520. The first lens unit 450a and the second lens unit 450b can converge the images emitted from the first mirror reflector and the second mirror reflector onto the left eye (LE) and right eye (RE) of the viewer.

[0256] The display panel according to the embodiments of the present specification and a display device including the same can form an emission layer with improved efficiency and brightness for each emission color for each sub-pixel on a display panel that is in close contact with the viewer's eyes.

[0257] The display device according to the embodiments of the present specification may be applied to a mobile device, a video phone, a smart watch, a wearable device, a foldable device, a rollable device, a bendable device, a flexible device, a curved device, a sliding device, a virtual reality device, an augmented reality device, an electronic organizer, an e-book, a portable multimedia player (PMP), a personal digital assistant (PDA), an MP3 player, a mobile medical device, a desktop PC, a laptop PC, a netbook computer, a workstation, a navigation system, a vehicle navigation system, a vehicle display device, a theater display device, a television, a wallpaper device, a signage device, a game device, a notebook computer, a monitor, a camera, a video camera, and a home appliance.

[0258] A display device according to an embodiment of the present specification can be described as follows.

[0259] A display device according to an embodiment of the present specification includes a substrate including first to third subpixels, a first electrode in each of the first to third subpixels, a first light-emitting portion on the first electrode and including a first light-emitting layer, a second light-emitting portion on the first light-emitting portion and including a second light-emitting layer, a third light-emitting portion on the second light-emitting portion and including a third light-emitting layer, and a second electrode on the third light-emitting portion, wherein the first to third light-emitting layers emit light of different colors from each other, and the distance between the first electrode and the second electrode may be 310 nm to 450 nm.

[0260] According to some embodiments herein, the distance between the first electrode and the second electrode is 310 nm, and the first light-emitting layer or the third light-emitting layer can be a red light-emitting layer.

[0261] According to some embodiments herein, the first light-emitting layer can be a red light-emitting layer, the second light-emitting layer can be a blue light-emitting layer, and the third light-emitting layer can be a green light-emitting layer.

[0262] According to some embodiments herein, the first light-emitting layer can be a red light-emitting layer and a green light-emitting layer overlying the red light-emitting layer, the second light-emitting layer can be a blue light-emitting layer, and the third light-emitting layer can be a green light-emitting layer.

[0263] According to some embodiments herein, the third light-emitting layer can be a red light-emitting layer, the second light-emitting layer can be a green light-emitting layer, and the first light-emitting layer can be a blue light-emitting layer.

[0264] According to some embodiments herein, the distance between the first electrode and the second electrode may be 385 nm, and the first light-emitting layer may be a green light-emitting layer.

[0265] According to some embodiments herein, the second light-emitting layer can be a blue light-emitting layer and the third light-emitting layer can be a red light-emitting layer.

[0266] According to some embodiments herein, the second light-emitting layer can be a red light-emitting layer and the third light-emitting layer can be a blue light-emitting layer.

[0267] According to some embodiments herein, the distance between the first electrode and the second electrode is 450 nm, and the first light-emitting layer or the third light-emitting layer can be a blue light-emitting layer.

[0268] According to some embodiments herein, the third light-emitting layer can be a blue light-emitting layer, the second light-emitting layer can be a red light-emitting layer, and the first light-emitting layer can be a green light-emitting layer.

[0269] According to some embodiments herein, the third light-emitting layer can be a blue light-emitting layer, the second light-emitting layer can be a green light-emitting layer, and the first light-emitting layer can be a red light-emitting layer.

[0270] According to some embodiments of the present disclosure, the display device may further include a reflective electrode in each of the first to third sub-pixels.

[0271] According to some embodiments herein, the display device may further include a first layer overlying the reflective electrodes of the first and second sub-pixels.

[0272] According to some embodiments of the present specification, the light emitting device may further include a first charge generation layer between the first light emitting unit and the second light emitting unit, and a second charge generation layer between the second light emitting unit and the third light emitting unit.

[0273] According to some embodiments of the present specification, the first electrode may be composed of an oxide containing at least one of indium (In), zinc (Zn), and tin (Sn), or may be composed of a nitride containing titanium (Ti), zinc (Zn), and indium (In).

[0274] A display device according to an embodiment of the present specification includes a substrate including first to third subpixels, reflective electrodes in each of the first to third subpixels, a first electrode on the reflective electrode, a first light-emitting section on the first electrode and including one of a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer, a second light-emitting section on the first light-emitting section and including a light-emitting layer different from that of the first light-emitting section, a third light-emitting section on the second light-emitting section and including a light-emitting layer different from that of the first light-emitting section and the second light-emitting section, and a second electrode on the third light-emitting section, wherein the blue light-emitting layer in one of the first to third light-emitting sections is disposed closer to the first electrode than the red light-emitting layer in one of the first to third light-emitting sections, and the distance between the first electrode and the second electrode may be 310 nm to 450 nm.

[0275] According to some embodiments of the present specification, the distance between the first electrode and the second electrode may be 310 nm, the light-emitting layer of the first light-emitting unit may be a blue light-emitting layer, the light-emitting layer of the third light-emitting unit may be a red light-emitting layer, and the light-emitting layer of the second light-emitting unit may be a green light-emitting layer.

[0276] According to some embodiments herein, the distance between the first electrode and the second electrode may be 385 nm, the light-emitting layer of the second light-emitting unit may be a blue light-emitting layer, the light-emitting layer of the third light-emitting unit may be a red light-emitting layer, and the light-emitting layer of the first light-emitting unit may be a green light-emitting layer.

[0277] According to some embodiments herein, the distance between the first electrode and the second electrode may be 450 nm, the light-emitting layer of the first light-emitting unit may be a blue light-emitting layer, the light-emitting layer of the second light-emitting unit may be a red light-emitting layer, and the light-emitting layer of the third light-emitting unit may be a green light-emitting layer.

[0278] According to some embodiments of the present specification, the light emitting device may further include a first charge generation layer between the first light emitting unit and the second light emitting unit, and a second charge generation layer between the second light emitting unit and the third light emitting unit.

[0279] A display device according to an embodiment of the present specification includes a substrate including first to third subpixels, reflective electrodes in each of the first to third subpixels, a first electrode on the reflective electrode, a first light-emitting section on the first electrode and including one of a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer, a second light-emitting section on the first light-emitting section and including a light-emitting layer different from that of the first light-emitting section, a third light-emitting section on the second light-emitting section and including a light-emitting layer different from that of the first light-emitting section and the second light-emitting section, and a second electrode on the third light-emitting section, wherein the red light-emitting layer in one of the first to third light-emitting sections is disposed closer to the first electrode than the blue light-emitting layer in one of the first to third light-emitting sections, and the distance between the first electrode and the second electrode may be 310 nm to 450 nm.

[0280] According to some embodiments herein, the distance between the first electrode and the second electrode may be 310 nm, the light-emitting layer of the first light-emitting unit may be a red light-emitting layer, the light-emitting layer of the second light-emitting unit may be a blue light-emitting layer, and the light-emitting layer of the third light-emitting unit may be a green light-emitting layer.

[0281] According to some embodiments herein, the distance between the first electrode and the second electrode may be 310 nm, the light-emitting layer of the first light-emitting unit may include a red light-emitting layer and a green light-emitting layer overlying the red light-emitting layer, the light-emitting layer of the second light-emitting unit may be a blue light-emitting layer, and the light-emitting layer of the third light-emitting unit may be a green light-emitting layer.

[0282] According to some embodiments herein, the distance between the first electrode and the second electrode may be 385 nm, the light-emitting layer of the first light-emitting unit may be a green light-emitting layer, the light-emitting layer of the second light-emitting unit may be a red light-emitting layer, and the light-emitting layer of the third light-emitting unit may be a blue light-emitting layer.

[0283] According to some embodiments of the present specification, the distance between the first electrode and the second electrode may be 450 nm, the light-emitting layer of the first light-emitting unit may be a red light-emitting layer, the light-emitting layer of the second light-emitting unit may be a green light-emitting layer, and the light-emitting layer of the third light-emitting unit may be a blue light-emitting layer.

[0284] According to some embodiments of the present specification, the light emitting device may further include a first charge generation layer between the first light emitting unit and the second light emitting unit, and a second charge generation layer between the second light emitting unit and the third light emitting unit.

[0285] A display device according to an embodiment of the present specification includes a substrate including first to third subpixels, a reflective electrode in each of the first to third subpixels, a first electrode on the reflective electrode, first to third light-emitting portions on the first electrode, and a second electrode on the third light-emitting portion, the first to third light-emitting portions being on the first light-emitting portion, and each of the first to third light-emitting portions including one of a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer, and the red light-emitting layer and the green light-emitting layer are arranged with a light-emitting portion including the blue light-emitting layer therebetween, and the distance between the first electrode and the second electrode may be 310 nm to 385 nm.

[0286] According to some embodiments herein, the distance between the first electrode and the second electrode is 310 nm, the first light-emitting portion includes a red light-emitting layer, the second light-emitting portion includes a blue light-emitting layer, and the third light-emitting portion includes a green light-emitting layer.

[0287] According to some embodiments herein, the distance between the first electrode and the second electrode is 385 nm, the first light-emitting portion includes a green light-emitting layer, the second light-emitting portion includes a blue light-emitting layer, and the third light-emitting portion includes a red light-emitting layer.

[0288] According to some embodiments of the present specification, the light emitting device may further include a first charge generation layer between the first light emitting unit and the second light emitting unit, and a second charge generation layer between the second light emitting unit and the third light emitting unit.

[0289] A display device according to an embodiment of the present specification includes a substrate including first to third subpixels, a reflective electrode in each of the first to third subpixels, a first electrode on the reflective electrode, a first light-emitting section on the first electrode and including one of a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer, a second light-emitting section on the first light-emitting section and including a light-emitting layer different from that of the first light-emitting section, a third light-emitting section on the second light-emitting section and including a light-emitting layer different from that of the first light-emitting section and the second light-emitting section, and a second electrode on the third light-emitting section, wherein the blue light-emitting layer in one of the first to third light-emitting sections is disposed closer to the first electrode than the red light-emitting layer in one of the first to third light-emitting sections, and the distance between the first electrode and the second electrode is set within a range determined by the distance from the second electrode to the light-emitting section.

[0290] According to some embodiments herein, the distance between the first electrode and the second electrode may be 310 nm, the light-emitting layer of the first light-emitting unit may be a blue light-emitting layer, the light-emitting layer of the second light-emitting unit may be a red light-emitting layer, and the light-emitting layer of the third light-emitting unit may be a green light-emitting layer.

[0291] According to some embodiments of the present specification, the distance between the first electrode and the second electrode may be 310 nm, the light-emitting layer of the first light-emitting unit may include a blue light-emitting layer, the light-emitting layer of the second light-emitting unit may be a red light-emitting layer, and the light-emitting layer of the third light-emitting unit may be a green light-emitting layer.

[0292] According to some embodiments herein, the distance between the first electrode and the second electrode may be 385 nm, the light-emitting layer of the first light-emitting unit may be a blue light-emitting layer, the light-emitting layer of the second light-emitting unit may be a red light-emitting layer, and the light-emitting layer of the third light-emitting unit may be a green light-emitting layer.

[0293] According to some embodiments of the present specification, the light emitting device may further include a first charge generation layer between the first light emitting unit and the second light emitting unit, and a second charge generation layer between the second light emitting unit and the third light emitting unit.

[0294] A display device according to an embodiment of the present specification includes a substrate including first to third subpixels, reflective electrodes in each of the first to third subpixels, a first electrode on the reflective electrode, a first light-emitting section on the first electrode and including one of a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer, a second light-emitting section on the first light-emitting section and including a light-emitting layer different from that of the first light-emitting section, a third light-emitting section on the second light-emitting section and including a light-emitting layer different from that of the first light-emitting section and the second light-emitting section, and a second electrode on the third light-emitting section, wherein the red light-emitting layer in one of the first to third light-emitting sections is disposed closer to the first electrode than the blue light-emitting layer in one of the first to third light-emitting sections, and the distance between the first electrode and the second electrode is set to a range including four or more blue light-emitting sections of the blue light-emitting layer.

[0295] According to some embodiments herein, the distance between the first electrode and the second electrode may be 310 nm, the light-emitting layer of the first light-emitting unit may be a red light-emitting layer, the light-emitting layer of the second light-emitting unit may be a blue light-emitting layer, and the light-emitting layer of the third light-emitting unit may be a green light-emitting layer.

[0296] According to some embodiments herein, the distance between the first electrode and the second electrode may be 310 nm, the light-emitting layer of the first light-emitting unit may include a red light-emitting layer and a green light-emitting layer overlying the red light-emitting layer, the light-emitting layer of the second light-emitting unit may be a blue light-emitting layer, and the light-emitting layer of the third light-emitting unit may be a green light-emitting layer.

[0297] According to some embodiments herein, the distance between the first electrode and the second electrode may be 385 nm, the light-emitting layer of the first light-emitting unit may be a green light-emitting layer, the light-emitting layer of the second light-emitting unit may be a red light-emitting layer, and the light-emitting layer of the third light-emitting unit may be a blue light-emitting layer.

[0298] According to some embodiments of the present specification, the distance between the first electrode and the second electrode may be 450 nm, the light-emitting layer of the first light-emitting unit may be a red light-emitting layer, the light-emitting layer of the second light-emitting unit may be a green light-emitting layer, and the light-emitting layer of the third light-emitting unit may be a blue light-emitting layer.

[0299] According to some embodiments of the present specification, the light emitting device may further include a first charge generation layer between the first light emitting unit and the second light emitting unit, and a second charge generation layer between the second light emitting unit and the third light emitting unit.

[0300] A display device according to an embodiment of the present specification includes a substrate including first to third subpixels, a first electrode in each of the first to third subpixels, first to third light-emitting sections on the first electrode, and a second electrode on the third light-emitting section, each of the first to third light-emitting sections including one of a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer on the first light-emitting section, the red light-emitting layer and the green light-emitting layer being arranged with a light-emitting section including the blue light-emitting layer between them, and the distance between the first electrode and the second electrode is set to a range including three or more blue light-emitting nodes of the blue light-emitting layer.

[0301] According to some embodiments herein, the distance between the first electrode and the second electrode is 310 nm, the first light-emitting portion includes a red light-emitting layer, the second light-emitting portion includes a blue light-emitting layer, and the third light-emitting portion includes a green light-emitting layer.

[0302] According to some embodiments herein, the distance between the first electrode and the second electrode is 385 nm, the first light-emitting portion includes a green light-emitting layer, the second light-emitting portion includes a blue light-emitting layer, and the third light-emitting portion includes a red light-emitting layer.

[0303] According to some embodiments of the present specification, the light emitting device may further include a first charge generation layer between the first light emitting unit and the second light emitting unit, and a second charge generation layer between the second light emitting unit and the third light emitting unit.

[0304] A display device according to an embodiment of the present specification includes a substrate including subpixels, a reflective electrode on the subpixels, a first electrode on the reflective electrode, a second electrode spaced a first distance vertically from the first electrode and a second distance vertically from the reflective electrode that is greater than the first distance, a first light-emitting portion on the first electrode, a second light-emitting portion between the first light-emitting portion and the second electrode, and a third light-emitting portion between the second light-emitting portion and the second electrode, wherein each of the first to third light-emitting portions emits a different color, and the reflective electrode and the second electrode form a microcavity.

[0305] Although the present invention has been described in detail above with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and various modifications may be made within the scope of the technical concept of the present invention. Therefore, the embodiments disclosed herein are intended to illustrate, not limit, the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by these embodiments. Therefore, the above-described embodiments should be understood to be illustrative in all respects and not limiting. The scope of protection of the present invention should be interpreted by the claims, and all technical concepts within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

Claims

1. a substrate including first, second, and third sub-pixels; a first reflective electrode disposed in the first sub-pixel, a second reflective electrode disposed in the second sub-pixel, and a third reflective electrode disposed in the third sub-pixel; a first insulating layer disposed on the first reflective electrode; a second insulating layer disposed on the second reflective electrode and having a thickness smaller than that of the first insulating layer; a first electrode formed in contact with the first insulating layer, the second insulating layer, and the third reflective electrode; a first light-emitting portion located on the first electrode and including a blue light-emitting layer; a second light-emitting section located on the first light-emitting section and including a green light-emitting layer; a third light-emitting section located on the second light-emitting section and including a red light-emitting layer; a second electrode on the third light emitting portion; Including, the blue light-emitting layer is closer to the first electrode than the red light-emitting layer; The distance between the first electrode and the second electrode is 310 nm; the blue light-emitting layer is disposed at a position 275 nm away from the second electrode; the green light-emitting layer is disposed at a position 195 nm away from the second electrode; the red light-emitting layer is disposed at a position 55 nm away from the second electrode; The green light-emitting layer has a maximum efficiency at a wavelength of 540 nm. Display device.

2. a substrate including first, second, and third sub-pixels; a first reflective electrode disposed in the first sub-pixel, a second reflective electrode disposed in the second sub-pixel, and a third reflective electrode disposed in the third sub-pixel; a first insulating layer disposed on the first reflective electrode; a second insulating layer disposed on the second reflective electrode and having a thickness smaller than that of the first insulating layer; a first electrode formed in contact with the first insulating layer, the second insulating layer, and the third reflective electrode; a first light-emitting portion stacked on the first electrode and including a green light-emitting layer; a second light-emitting section stacked on the first light-emitting section and including a blue light-emitting layer; a third light-emitting section stacked on the second light-emitting section and including a red light-emitting layer; a second electrode on the third light emitting portion; Including, the blue light-emitting layer is closer to the first electrode than the red light-emitting layer; the distance between the first electrode and the second electrode is 385 nm; the green light-emitting layer is disposed at a position 340 nm away from the second electrode; the blue light-emitting layer is disposed at a position 155 nm away from the second electrode; the red light-emitting layer is disposed at a position 55 nm away from the second electrode; The blue light-emitting layer has a maximum efficiency at a wavelength of 460 nm. Display device.

3. A substrate including a first subpixel, a second subpixel, and a third subpixel; a first reflective electrode disposed in the first sub-pixel, a second reflective electrode disposed in the second sub-pixel, and a third reflective electrode disposed in the third sub-pixel; a first insulating layer disposed on the first reflective electrode; a second insulating layer disposed on the second reflective electrode and having a thickness smaller than that of the first insulating layer; a first electrode formed in contact with the first insulating layer, the second insulating layer, and the third reflective electrode; a first light-emitting portion located on the first electrode and including a blue light-emitting layer; a second light-emitting section located on the first light-emitting section and including a red light-emitting layer; a third light-emitting section located on the second light-emitting section and including a green light-emitting layer; a second electrode on the third light emitting portion; Including, the blue light-emitting layer is closer to the first electrode than the red light-emitting layer; the distance between the first electrode and the second electrode is 450 nm; the blue light-emitting layer is disposed at a position 405 nm away from the second electrode; the red light-emitting layer is disposed at a position 230 nm away from the second electrode; the green light-emitting layer is disposed at a position 50 nm away from the second electrode, The red light-emitting layer has a maximum efficiency at a wavelength of 620 nm. Display device.

4. A substrate including a first subpixel, a second subpixel, and a third subpixel; a first reflective electrode disposed in the first sub-pixel, a second reflective electrode disposed in the second sub-pixel, and a third reflective electrode disposed in the third sub-pixel; a first insulating layer disposed on the first reflective electrode; a second insulating layer disposed on the second reflective electrode and having a thickness smaller than that of the first insulating layer; a first electrode formed in contact with the first insulating layer, the second insulating layer, and the third reflective electrode; a first light-emitting portion on the first electrode, the first light-emitting portion including a red light-emitting layer; a second light-emitting section located on the first light-emitting section and including a blue light-emitting layer; a third light-emitting section located on the second light-emitting section and including a green light-emitting layer; a second electrode on the third light emitting portion; Including, the red light-emitting layer is closer to the first electrode than the blue light-emitting layer; The distance between the first electrode and the second electrode is 310 nm; the red light-emitting layer is disposed at a position 230 nm away from the second electrode; the blue light-emitting layer is disposed at a position 155 nm away from the second electrode; the green light-emitting layer is disposed at a position 50 nm away from the second electrode, the red light-emitting layer has a maximum efficiency at a wavelength of 620 nm; The blue light-emitting layer has a maximum efficiency at a wavelength of 460 nm. Display device.

5. A substrate including a first subpixel, a second subpixel, and a third subpixel; a first reflective electrode disposed in the first sub-pixel, a second reflective electrode disposed in the second sub-pixel, and a third reflective electrode disposed in the third sub-pixel; a first insulating layer disposed on the first reflective electrode; a second insulating layer disposed on the second reflective electrode and having a thickness smaller than that of the first insulating layer; a first electrode formed in contact with the first insulating layer, the second insulating layer, and the third reflective electrode; a first light-emitting portion on the first electrode, the first light-emitting portion including a green light-emitting layer; a second light-emitting section located on the first light-emitting section and including a red light-emitting layer; a third light-emitting section located on the second light-emitting section and including a blue light-emitting layer; a second electrode on the third light emitting portion; Including, the red light-emitting layer is closer to the first electrode than the blue light-emitting layer; the distance between the first electrode and the second electrode is 385 nm; the green light-emitting layer is disposed at a position 340 nm away from the second electrode; the red light-emitting layer is disposed at a position 230 nm away from the second electrode; the blue light-emitting layer is disposed at a position 35 nm away from the second electrode; The red light-emitting layer has a maximum efficiency at a wavelength of 620 nm. Display device.

6. A substrate including a first subpixel, a second subpixel, and a third subpixel; a first reflective electrode disposed in the first sub-pixel, a second reflective electrode disposed in the second sub-pixel, and a third reflective electrode disposed in the third sub-pixel; a first insulating layer disposed on the first reflective electrode; a second insulating layer disposed on the second reflective electrode and having a thickness smaller than that of the first insulating layer; a first electrode formed in contact with the first insulating layer, the second insulating layer, and the third reflective electrode; a first light-emitting portion on the first electrode, the first light-emitting portion including a red light-emitting layer; a second light-emitting section located on the first light-emitting section and including a green light-emitting layer; a third light-emitting section located on the second light-emitting section and including a blue light-emitting layer; a second electrode on the third light emitting portion; Including, the red light-emitting layer is closer to the first electrode than the blue light-emitting layer; the distance between the first electrode and the second electrode is 450 nm; the red light-emitting layer is disposed at a position 405 nm away from the second electrode; the green light-emitting layer is disposed at a position 195 nm away from the second electrode; the blue light-emitting layer is disposed at a position 35 nm away from the second electrode; The green light-emitting layer has a maximum efficiency at a wavelength of 540 nm. Display device.

7. a first charge generation layer disposed between the first light-emitting section and the second light-emitting section; a second charge generation layer disposed between the second light-emitting section and the third light-emitting section; The display device according to any one of claims 1 to 6, further comprising:

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