Display device

Abstract

The present disclosure provides a display device having a structure in which a ratio of p-type hosts in a light-emitting layer in a second active region having a second resolution lower than a first resolution is set to be greater than a ratio of p-type hosts in a light-emitting layer in a first active region having the first resolution, whereby the ratio of p-type hosts in the light-emitting layer is greater than the ratio of p-type hosts in the light-emitting layer in the first active region having the first resolution. An advantage of driving at low power is provided by reducing a brightness difference between a region in which a low-resolution pixel is disposed and a region in which a high-resolution pixel is disposed.

Description

[0001] Cross - reference to related applications

[0002] This application claims the benefit of priority of Korean Patent Application No. 10 - 2023 - 0176922, filed on December 7, 2023, with the Korean Intellectual Property Office, which is incorporated herein by reference in its entirety for all purposes as if fully set forth herein. Technical field

[0003] The present disclosure relates to an electronic device having a display, and more particularly, to a display device. Background art

[0004] Light - emitting displays are generally classified into organic light - emitting displays and inorganic light - emitting displays based on the materials of the light - emitting layer.

[0005] An active - matrix organic light - emitting display includes self - emissive organic light - emitting diodes and has advantages such as short response time, high luminous efficiency, excellent brightness, and wide viewing angle.

[0006] In an organic light - emitting display, one or more organic light - emitting diodes may be provided in each pixel. The organic light - emitting display provides advantages such as not only short response time, excellent luminous efficiency, high brightness, and wide viewing angle, but also high contrast and excellent color gamut because the black gray level can be represented as completely black.

[0007] In modern society, mobile terminals are widely used, and the multimedia functions for implementing various necessary functions or applications in daily life through mobile terminals are increasingly improved.

[0008] For example, cameras have been defaultly embedded in smartphones, and recently, cameras with resolutions approaching those of conventional digital cameras have been applied to smartphones.

[0009] However, the front - facing camera embedded in a smartphone may impose restrictions on the size and design of the screen, and thus, it is difficult to design the screen more widely and freely.

[0010] To reduce the corresponding space occupied by the camera, screen designs including notches or punch - holes have been adopted in smartphones. However, in these embodiments, the screen size may still be limited due to the camera, and thus, a full - screen display needs to be implemented.

[0011] Full - screen display may refer to an image display embodiment of a display device in which an image can be displayed on most of the front surface of a mobile terminal such as a smartphone. Summary of the invention

[0012] To achieve full-screen display in a display device, a solution can be provided to allocate an area for setting low-resolution pixels in the screen area of the display panel and to set a camera and / or various sensors in an area of the display device that is located below the display panel and opposite to the area where the low-resolution pixels are set.

[0013] However, since pixels still exist in the area where low-resolution pixels are set and the corresponding light-emitting area decreases, more than 1.5 times the current may be required to drive the current required for the low-resolution pixels to maintain the same brightness.

[0014] Due to the increase in the required amount of current, the lifespan of the pixels may be reduced. As a result, over time, the brightness difference between the area where low-resolution pixels are set and the area where high-resolution pixels are set may become significant, and thus, the boundary of the area where low-resolution pixels are set can be clearly identified.

[0015] To solve these problems, the inventors of the present disclosure provided various embodiments of a display device that can reduce the brightness difference between the area where low-resolution pixels are set and the area where high-resolution pixels are set even when the low-resolution pixels are used for a long time by increasing the lifespan of the low-resolution pixels.

[0016] One or more aspects of the present disclosure can provide a display device that can reduce the brightness difference between the area where low-resolution pixels are set and the area where high-resolution pixels are set.

[0017] According to one or more example embodiments of the present disclosure, a display device can be provided, including: a first active area in which a plurality of first pixels are set, the first active area having a first resolution; a second active area in which a plurality of second pixels are set, the second active area having a second resolution less than the first resolution; and a plurality of light-emitting elements, the plurality of light-emitting elements being set in each of the plurality of first pixels and the plurality of second pixels. Each of the plurality of light-emitting elements can include a first electrode layer, a second electrode layer, and a light-emitting layer, and the light-emitting layer is located between the first electrode layer and the second electrode layer and is any one of a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer. The light-emitting layer can include at least one of a p-type host and an n-type host, and at least one of the red light-emitting layer, the green light-emitting layer, and the blue light-emitting layer can be configured to satisfy the following formula:

[0018] Formula 1

[0019] p 1 / (n 1 +p 1 )<p 2 / (n 2+p 2 )

[0020] where p 1 is the number of moles of the p-type host of the light-emitting layer located in the first active region, and p 2 is the number of moles of the p-type host of the light-emitting layer located in the second active region, and n 1 is the number of moles of the n-type host of the light-emitting layer located in the first active region, and n 2 is the number of moles of the n-type host of the light-emitting layer located in the second active region.

[0021] According to one or more example embodiments of the present disclosure, a display device may be provided, including: a first active region in which a plurality of first pixels are provided, the first active region having a first resolution; a second active region in which a plurality of second pixels are provided, the second active region having a second resolution less than the first resolution; and a plurality of light-emitting elements provided in each of the plurality of first pixels and the plurality of second pixels. Each of the plurality of light-emitting elements may include a first electrode layer, a second electrode layer, and a light-emitting layer, and the light-emitting layer is located between the first electrode layer and the second electrode layer and is any one of a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer. The light-emitting layer may include at least one of a p-type host and an n-type host. At least one of the red light-emitting layer, the green light-emitting layer, and the blue light-emitting layer located in the second active region may include a first layer including a p-type host and an n-type host and a second layer located on the surface of the first layer and including a p-type host. At least one of the red light-emitting layer, the green light-emitting layer, and the blue light-emitting layer located in the first active region may include a first layer including a p-type host and an n-type host.

[0022] According to one or more aspects of the present disclosure, a display device may be provided that can reduce the brightness difference between a region provided with low-resolution pixels and a region provided with high-resolution pixels, and thereby enable low-power operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are included to provide a further understanding of the present disclosure, and are incorporated in and constitute a part of this specification, illustrating various aspects of the present disclosure and, together with the description, serve to explain the principles of the present disclosure. In the drawings:

[0024] Figure 1 Schematically shows an example display device according to an aspect of the present disclosure;

[0025] Figure 2 is an example cross-sectional view of a display device according to an aspect of the present disclosure;

[0026] Figure 3Shows a plurality of first pixels disposed in a first active region of a display device according to an aspect of the present disclosure;

[0027] Figure 4 Shows a plurality of second pixels disposed in a second active region of a display device according to an aspect of the present disclosure;

[0028] Figure 5A And Figure 5B Is a cross-sectional view of an exemplary light-emitting element included in a display device according to an aspect of the present disclosure;

[0029] Figure 6A Is a cross-sectional view of an exemplary light-emitting element included in each first pixel of a display device according to an aspect of the present disclosure;

[0030] Figure 6B And Figure 6C Is a cross-sectional view of an exemplary light-emitting element included in each second pixel of a display device according to an aspect of the present disclosure;

[0031] Figure 7A Is another cross-sectional view of an exemplary light-emitting element included in a first pixel of a display device according to an aspect of the present disclosure;

[0032] Figure 7B And Figure 7C Are other cross-sectional views of an exemplary light-emitting element included in a second pixel of a display device according to an aspect of the present disclosure;

[0033] Figure 8 Is a front view of an exemplary thin-film deposition apparatus for manufacturing a light-emitting element according to an aspect of the present disclosure;

[0034] Figure 9 Is a graph showing the lifetime and intensity of a green sub-pixel for a p-type body ratio in a display device according to an aspect of the present disclosure;

[0035] Figure 10 Is a graph showing the lifetime of a green sub-pixel relative to the p-type body molar ratio of the second active region to the first active region in a display device according to an aspect of the present disclosure;

[0036] Figure 11 Is a graph showing the pixel area ratio of the second active region to the first active region relative to the p-type body molar ratio of the second active region to the first active region in a display device according to an aspect of the present disclosure. Detailed Description

[0037] Now, example embodiments of the present disclosure will be described in detail, and examples thereof can be illustrated in the drawings.

[0038] In the following description, the structures, embodiments, implementations, methods, and operations described herein are not limited to the specific examples or examples set forth herein and may be varied as known in the art, unless otherwise specified. The same reference numerals throughout the text denote the same elements, unless otherwise indicated. The names of the respective elements used in the following explanations are chosen only for the convenience of writing the specification and may thus be different from the names used in actual products. The advantages and features of the present disclosure and methods for realizing them will be clarified by the example embodiments described below with reference to the drawings. However, the present disclosure may be embodied in different forms and should not be construed as limited to the example embodiments set forth herein. Rather, these example embodiments are provided so that the present disclosure is sufficiently thorough and complete to assist those skilled in the art in fully understanding the scope of the present disclosure. Additionally, the scope of protection of the present disclosure is defined by the claims and their equivalents. In the following description, detailed descriptions of related known functions or configurations may be omitted where such detailed descriptions may unnecessarily obscure aspects of the present disclosure. The shapes, sizes, ratios, angles, quantities, etc. illustrated in the drawings to describe the various example embodiments of the present disclosure are given only by way of example. Therefore, the present disclosure is not limited to the illustrations in the drawings. When using terms such as "comprising", "having", "including", "containing", "constituting", "composing", "forming", etc., one or more other elements may be added, unless a term such as "only" is used. An element described in the singular is intended to include a plurality of elements, and vice versa, unless the context clearly indicates otherwise.

[0039] Although terms such as "first", "second", A, B, (a), (b), etc. may be used herein to describe various elements, these elements should not be construed as being limited by these terms. They are not used to define a specific order or priority. These terms are only used to distinguish one element from another. For example, without departing from the scope of the present disclosure, the first element may be referred to as the second element, and similarly, the second element may be referred to as the first element.

[0040] When referring to the first element being "connected or coupled to" the second element, "contacting or overlapping" the second element, etc., it should be understood that not only can the first element be "directly connected or coupled to" the second element or "directly contacting or overlapping" the second element, but also a third element may be "interposed" between the first element and the second element, or the first element and the second element may be "connected or coupled", "contacting or overlapping", etc. with each other via a fourth element. Here, the second element may be included in at least one of two or more elements that are "connected or coupled", "contacting or overlapping", etc. with each other.

[0041] As used herein, "at least one of A and B" should be understood to mean "only A, only B, or both A and B".

[0042] When relative time terms, such as "after", "subsequently", "next", "before", etc., are used to describe the process or operation of an element or configuration, or the flow or steps in an operation, process, or manufacturing method, these terms can be used to describe a non - continuous or non - sequential process or operation, unless the term is used together with the terms "directly" or "immediately".

[0043] When describing a positional relationship, such as using "on", "above", "below", "under", "over", "beside", "near", etc. to describe the positional relationship between two parts, one or more other parts can be located between the two parts, unless more restrictive terms, such as "immediately adjacent to", "directly", or "closely", are used. For example, in the case where an element or layer is disposed "on" another element or layer, a third element or layer can be interposed therebetween. In addition, the terms "left", "right", "up", "down", "top", "bottom", "upward", "downward", etc. refer to an arbitrary reference system.

[0044] In addition, when referring to any dimensions, relative sizes, etc., even if no relevant description is specified, the numerical values or corresponding information (such as horizontal, range, etc.) of the element or feature should be considered, including the tolerance or error range that may be caused by various factors (such as process factors, internal or external influences, noise, etc.). Additionally, the term "may" fully encompasses all the meanings of the term "can".

[0045] Hereinafter, various exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0046] Figure 1 An exemplary display device 100 according to an aspect of the present disclosure is schematically shown.

[0047] Referring to Figure 1 , in one or more exemplary embodiments, the display device 100 may include a display panel 110 and a housing (or casing).

[0048] The front surface of the display panel 100 may be composed of a display area.

[0049] Full - screen display can be achieved by applying this embodiment.

[0050] The display area may include a first active area AA1 and a second active area AA2.

[0051] Both the first active area AA1 and the second active area AA2 may be configured to present an image, but the resolution of each of the first active area AA1 and the second active area AA2 may be different.

[0052] For example, the resolution of the second active region AA2 in which a plurality of second pixels PG2 are provided may be lower than the resolution of the first active region AA1 in which a plurality of first pixels PG1 are provided. In other words, the density of the plurality of second pixels PG2 in the second active region AA2 is lower than the density of the plurality of first pixels PG1 in the first active region AA1, as Figure 3 and Figure 4 shown. For example, Figure 4 shows that due to the presence of one or more light-transmitting regions AG, the density of the plurality of second pixels PG2 in the second active region AA2 is lower than the density of the plurality of first pixels PG1 in the first active region AA1. This will be explained in detail below in conjunction with Figure 3 and Figure 4 It is possible to allow the amount of light corresponding to the degree of reduction in the resolution of the second active region AA2 including a plurality of second pixels to reach one or more sensors (41, 42) provided in the second active region AA2.

[0053] However, the exemplary embodiments of the present disclosure are not limited thereto. For example, when the second active region AA2 has sufficient light transmittance or a suitable noise compensation algorithm is implemented, the resolution of the second active region AA2 may be the same as or substantially the same as the resolution of the first active region AA1.

[0054] For the purpose of description, an example in which the resolution of the second active region AA2 of the display panel 110 is lower than the resolution of the first active region AA1 is provided for illustration.

[0055] In one or more aspects, the second active region AA2 included in the display panel 110 may be a region in which one or more sensors (41, 42) are provided.

[0056] The second active region AA2 may be a region overlapping with one or more sensors. Therefore, the second active region AA2 may have a size smaller than that of the first active region AA1 which presents most of the image presented in the display area.

[0057] The sensors (41, 42) may include at least one of an image sensor, a proximity sensor, an illuminance sensor, an attitude sensor, a motion sensor, a fingerprint recognition sensor, and a biometric sensor.

[0058] For example, one or more sensors (41, 42) provided in the second active region AA2 may include a first sensor 41 such as an illuminance sensor, and a second sensor 42 such as an image sensor for capturing an image or video. However, the exemplary embodiments of the present disclosure are not limited thereto.

[0059] Figure 2 is an example cross-sectional view of the display device 100 according to an aspect of the present disclosure.

[0060] Referring to Figure 2 , each of the first active region AA1 and the second active region AA2 may include one or more pixel arrays in which a plurality of pixels capable of emitting light according to pixel data are provided.

[0061] The plurality of first pixels PG1 or the plurality of second pixels PG2 may represent the pixel array.

[0062] In this document, the term "resolution" may refer to the number of pixels per unit area (which may be referred to as the number of pixels per inch (PPI)). For example, in order to increase the light transmittance of the second active region AA2, the number of pixels per unit area of the second active region AA2 may be lower than the number of pixels per unit area of the first active region AA1.

[0063] A plurality of pixels configured to have a relatively large number of pixels per unit area may be provided in each of the one or more pixel arrays included in the first active region AA1.

[0064] The number of pixels per unit area in the first active region AA1 may be 400 ppi or more, but the exemplary embodiments of the present disclosure are not limited thereto.

[0065] On the contrary, a plurality of pixel groups spaced apart by one or more light-transmitting regions AG and configured to have a relatively small number of pixels per unit area may be provided in each of the one or more pixel arrays included in the second active region AA2.

[0066] The number of pixels per unit area of the second active region AA2 may be 200 ppi or less, but the exemplary embodiments of the present disclosure are not limited thereto.

[0067] In the second active region AA2, external light may pass through the display panel 110 through one or more light-transmitting regions AG having a high light transmittance and be received by a sensor located below the display panel 110.

[0068] Since both the first active region AA1 and the second active region AA2 include pixels, an input image may be presented in both the first active region AA1 and the second active region AA2.

[0069] Each pixel provided in each of the first active region AA1 and the second active region AA2 may include sub-pixels of different colors to present a color image.

[0070] The sub-pixels may include a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B.

[0071] It should be noted that although the sub-pixels may further include white sub-pixels, for simplicity, Figure 2An example is shown in which a pixel includes a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B.

[0072] In one or more aspects, each sub-pixel may include a pixel circuit and a light-emitting element, such as an organic light-emitting diode (OLED), etc.

[0073] The second active region AA2 may include pixels and one or more sensors disposed below or at the lower part of the display panel 110.

[0074] As described above, the sensors may include various types of sensors. Hereinafter, for convenience of description, an example in which a camera module is provided as an example of the sensor disposed in the display device 100 will be discussed.

[0075] Based on the pixel data of the input image data, it is written into the second pixel PG2 disposed in the second active region AA2 in the display mode. The second pixel PG2 is capable of emitting light corresponding to the pixel data to display an image in the display area of the display panel 110.

[0076] The camera module may capture an external image in the imaging mode and output photo or video data.

[0077] The lens 30 of the camera module may face the second active region AA2.

[0078] External light may be incident on the lens 30 of the camera module through the second active region AA2, and the lens 30 may focus the light on the image sensor.

[0079] The camera module may capture an external image in the imaging mode and output photo or video data.

[0080] Since the number of pixels per unit area of one or more pixel arrays in the second active region AA2 is relatively low to achieve high light transmittance, an image quality compensation algorithm may be applied to compensate for the brightness and color coordinates of the pixels in the second active region AA2.

[0081] Therefore, full-screen display can be achieved without any limitation on the display area of the display panel 110 due to the camera module disposed below or at the lower part of the display panel 110.

[0082] The display panel has a width in the x-axis direction, a length in the y-axis direction, and a thickness in the z-axis direction.

[0083] The display panel 110 may include a circuit layer 12 disposed on the substrate 10 and a light-emitting element layer 14 disposed on the circuit layer 12.

[0084] The encapsulation layer 18 may be disposed on the light-emitting element layer 14, and the cover glass 20 may be disposed on the encapsulation layer 18.

[0085] In one or more aspects, a polarizer may be disposed between the encapsulation layer 18 and the cover glass 20 to improve the visibility of the display device 100 in a bright environment.

[0086] The circuit layer 12 may include: pixel circuits connected to lines such as data lines, gate lines, power supply lines, etc.; and a gate driver connected to the gate lines.

[0087] The circuit layer 12 may include: circuit elements such as one or more transistors (which may be thin film transistors (TFTs)), at least one capacitor; and lines.

[0088] The lines and circuit elements of the circuit layer 12 may be implemented or formed by a plurality of insulating layers, two or more metal layers separated by insulating layers interposed therebetween, and an active layer including a semiconductor material.

[0089] The light-emitting element layer 14 may include light-emitting elements driven by the pixel circuits.

[0090] The light-emitting element layer 14 may be covered by the encapsulation layer 18.

[0091] The encapsulation layer 18 may have a structure in which at least one organic layer and at least one inorganic layer are alternately stacked.

[0092] The inorganic layer may prevent the penetration of moisture or oxygen, and the organic layer may be configured to planarize the surface of the inorganic layer.

[0093] Since the travel path of moisture or oxygen in the stacked structure of one or more organic layers and one or more inorganic layers becomes longer than that in a structure having a single layer, the encapsulation layer 18 can effectively prevent the influence of the penetration of moisture and oxygen on the light-emitting element layer 14.

[0094] Figure 3 A plurality of first pixels PG1 provided in the first active region AA1 of the display device 100 according to an aspect of the present disclosure are shown.

[0095] Referring to Figure 3 , the first active region AA1 may include a plurality of first pixels PG1 arranged in a matrix form.

[0096] Each of the first pixels PG1 may be implemented as a unit pixel by including two or more sub-pixels among a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B.

[0097] In one or more aspects, each of the plurality of first pixels PG1 may further include a white sub-pixel.

[0098] In one or more aspects, two sub-pixels may be implemented as one pixel by a sub-pixel rendering algorithm.

[0099] For example, each of one or more first pixels PG1 may be configured to include a red sub-pixel R and a green sub-pixel G.

[0100] In another example, each of one or more first pixels PG1 may be configured to include a blue sub-pixel B and a green sub-pixel G.

[0101] In these examples, such insufficient color representation in each of the first pixels PG1 may be compensated by a sub-pixel rendering algorithm based on an average value of corresponding color data of adjacent pixels.

[0102] Figure 3 It is shown that the sub-pixels are arranged such that the red sub-pixel R, the green sub-pixel G, the blue sub-pixel B, and the green sub-pixel G are arranged in a zigzag form in the x-axis direction, but the exemplary embodiments of the present disclosure are not limited thereto.

[0103] Figure 4 It shows a plurality of second pixels PG2 provided in a second active region AA2 of a display device 100 according to an aspect of the present disclosure.

[0104] Referring to Figure 4 , a plurality of light-transmitting regions AG may be provided in the second active region AA2. Each of the plurality of light-transmitting regions AG may be provided between the plurality of second pixels PG2.

[0105] The light-transmitting region AG may include one or more transparent materials having a high light transmittance and not including metal, so that light can reach the light-transmitting region AG with minimal or reduced loss.

[0106] In one or more aspects, the light-transmitting region AG may include a transparent insulating material and not include metal wires or pixels.

[0107] Figure 4 It is shown that the shape of the light-transmitting region AG is circular, but the exemplary embodiments of the present disclosure are not limited thereto.

[0108] For example, the light-transmitting region AG may be designed in various shapes such as circular, oval, polygonal, etc.

[0109] Except for the configuration related to the dopant described below, the configuration of the second pixel PG2 may be substantially the same as the configuration of the first pixel PG1 described in Figure 3 , and thus, for the sake of convenience of description, the discussion of such a configuration of the second pixel PG2 is omitted.

[0110] Figure 5A And Figure 5B are cross-sectional views of exemplary light-emitting elements 140 and 240 included in a display device 100 according to an aspect of the present disclosure.

[0111] Referring to Figure 5A , in one or more exemplary embodiments, the stack of light-emitting elements 140 included in the display device 100 may include respective portions of a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B that are disposed on the substrate 10 and configured to emit different colors.

[0112] The stack of light-emitting elements 140 may include a first electrode layer 141 disposed on the substrate 10, a second electrode layer 148 disposed opposite the first electrode layer 141, and a light-emitting layer 145 disposed between the first electrode layer 141 and the second electrode layer 148.

[0113] The first electrode layer 141 may be an anode, and the second electrode layer 148 may be a cathode, but the exemplary embodiments of the present disclosure are not limited thereto.

[0114] For example, in the case of an inverted type, the first electrode layer 141 may be a cathode, and the second electrode layer 148 may be an anode.

[0115] Hereinafter, it should be noted that discussions are provided based on an example in which the first electrode layer and the second electrode layer (141 and 148) of each light-emitting element 140 are an anode and a cathode, respectively.

[0116] At least one transistor (not shown in Figure 5A ) disposed above the substrate 10 may include a source electrode, a drain electrode, a gate electrode, and an active layer, and the first electrode layer 141 may be electrically connected to either the source electrode or the drain electrode of the transistor through a contact hole formed in an insulating layer disposed on the substrate 10.

[0117] The first electrode layer 141 may include a material having a relatively high work function.

[0118] The first electrode layer 141 may include, for example, a transparent conductive oxide such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), aluminum zinc oxide (AZO), indium oxide (In 2 O 3 ), tin oxide (SnO 2 ), etc., but the exemplary embodiments of the present disclosure are not limited thereto.

[0119] The second electrode layer 148 may include a material having a relatively low work function, such as a metal, an alloy, a conductive compound, or a mixture of two or more thereof.

[0120] For example, a transmissive electrode as the second electrode layer 58 may be obtained by forming lithium (Li), magnesium (Mg), aluminum (Al), aluminum-lithium (Al-Li), calcium (Ca), magnesium-indium (Mg-In), magnesium-silver (Mg-Ag), etc. in the form of a thin film.

[0121] In this regard, in one or more aspects, various modifications can be made, such as forming a transmissive electrode using ITO or IZO to obtain a top-emitting light-emitting element.

[0122] A cover layer ( Figure 5A not shown in the figure) may be provided on the second electrode layer 148 to improve optical capabilities and maximize light-emitting efficiency.

[0123] For example, the cover layer may include a metal oxide layer, a metal nitride layer, or a metal oxynitride layer.

[0124] For example, the cover layer may include MoO x (x = 2 to 4), Al 2 O 3 , Sb 2 O 3 , BaO, CdO, CaO, Ce 2 O 3 , CoO, Cu 2 O, DyO, GdO, HfO 2 , La 2 O 3 , Li 2 O, MgO, NbO, NiO, Nd 2 O 3 , PdO, Sm 2 O 3 , ScO, SiO 2 , SrO, Ta 2 O 3 , TiO, WO 3 , VO 2 , YbO, Y 2 O 3 , ZnO, ZrO, A1N, BN, NbN, SiN, TaN, TiN, VN, YbN, ZrN, SiON, A1ON, or a mixture thereof, but the exemplary embodiments of the present disclosure are not limited thereto.

[0125] Referring to Figure 5A , the light-emitting layer 145 of the stack of the light-emitting element 140 may include a red light-emitting layer 145R of the red sub-pixel R, a green light-emitting layer 145G of the green sub-pixel G, and a blue light-emitting layer 145B of the blue sub-pixel B.

[0126] For example, the wavelengths of the light emitted from the light-emitting layers (145R, 145G, and 145B) may be the red light-emitting layer 145R, the green light-emitting layer 145G, and the blue light-emitting layer 145B in decreasing order of length.

[0127] The red light-emitting layer 145R may include a red host and a red dopant.

[0128] The red host can be Alq3, CBP, PVK, AND, TCTA, TPBI, TBADN, E3, DSA, or a mixture of two or more thereof, but the exemplary embodiments of the present disclosure are not limited thereto.

[0129] The red dopant can be PtOEP, Ir(piq) 3 , Btp2Ir(acac), Ir(2-phq) 2 (acac), Ir(2-phq) 3 , Ir(flq) 2 (acac), Ir(fliq) 2 (acac), or a compound containing DCM or DCJTB, but the exemplary embodiments of the present disclosure are not limited thereto.

[0130] The green light-emitting layer 145G can include a green host and a green dopant.

[0131] The green host can be Alq3, CBP, PVK, AND, TCTA, TPBI, TBADN, E3, DSA, or a mixture of two or more thereof, but the exemplary embodiments of the present disclosure are not limited thereto.

[0132] The green dopant can be Ir(ppy) 3 tris(2-phenylpyridine)iridium, Ir(ppy) 2 (acac) (bis(2-phenylpyridine)(acetylacetonato)iridium(III), Ir(mppy) 3 (tris(2-(4-methylphenyl)phenylpyridine)iridium, C545T10-(2benzothiazolyl)-1,1,7,7-tetramethyl-2,3,6,7-tetrahydro-1H,5H,11H-[1]benzopyrano[6,7,8-ij]-quinolin-11-one, etc., but the exemplary embodiments of the present disclosure are not limited thereto.

[0133] The blue light-emitting layer 145B can include a blue host and a blue dopant.

[0134] The blue host can be Alq 3 , CBP (4,4’-N,N’-dicarbazole-biphenyl), PVK (poly(n-vinylcarbazole), ADN (9,10-bis(naphthalen-2-yl)anthracene), TCTA, TPBI (1,3,5-tris(n-phenylbenzimidazol-2-yl)benzene), TBADN (3-tert-butyl-9,10-bis(naphthalen-2-yl)anthracene), E3, DSA (distyrylarene), or a mixture of two or more thereof, but the exemplary embodiments of the present disclosure are not limited thereto.

[0135] The blue dopant may use a compound including F 2 Irpic, (F 2 ppy) 2 Ir(tmd), Ir(dfppz) 3 , compounds such as terfluorene, DPAVBi (4,4'-bis(4-diphenylaminostyryl)biphenyl), TBPe, etc., but the exemplary embodiments of the present disclosure are not limited thereto.

[0136] Referring to Figure 5A , the stack of the light-emitting element 140 may include a hole transport layer 143 disposed between the first electrode layer 141 and the light-emitting layer 145.

[0137] The hole transport layer 143 may include a common hole transport layer 143C disposed on the hole injection layer 142.

[0138] The hole transport layer 143 may include a light-emission assisting layer disposed between the hole transport layer 143 and the common hole transport layer 143C.

[0139] The light-emission assisting layer may include a red light-emission assisting layer 143R, a green light-emission assisting layer 143G, and a blue light-emission assisting layer (not shown) disposed on the common hole transport layer 143C.

[0140] For example, the light-emission assisting layer may be used to transport holes and may include a hole transport material. The light-emission assisting layer may include the same material or compound, or may include different materials or compounds.

[0141] For example, the hole transport layer 143, the common hole transport layer 143C, the red light-emission assisting layer 143R, the green light-emission assisting layer 143G, and the blue light-emission assisting layer (not shown) may include a material containing a tertiary amine or a tertiary amine containing fluone, but the exemplary embodiments of the present disclosure are not limited thereto.

[0142] Referring to Figure 5A , the stack of the light-emitting element 140 may include a hole injection layer 142 disposed on the first electrode layer 141, a hole transport layer 143 disposed on the hole injection layer, a light-emitting layer 145 disposed on the hole transport layer 143, and an electron transport layer 147 disposed on the light-emitting layer 145, but the exemplary embodiments of the present disclosure are not limited thereto.

[0143] When a voltage is applied between the first electrode layer 141 and the second electrode layer 148 of the stack of the light-emitting element 140, holes passing through the hole transport layer 143 and electrons passing through the electron transport layer 147 may move to the light-emitting layer 145 and form excitons, which enables the light-emitting layer 145 to emit visible light.

[0144] Referring toFigure 5A , the stack of the light-emitting element 140 may include an electron blocking layer 144 between the hole transport layer 143 and the light-emitting layer 145.

[0145] However, the exemplary embodiments of the present disclosure are not limited thereto. For example, the stack of the light-emitting element 140 may not include the electron blocking layer 144.

[0146] The electron blocking layer 144 may include at least one of tris(phenylpyrazolyl)iridium, BPAPF (9,9-bis[4-(N,N-biphenyl-4-ylamino)phenyl]-9H-fluorene), bis[4-(p,p-dimethylphenylamino)phenyl]diphenylsilane, NPD (4,4'-bis[N-(1-naphthyl)-N-phenylamino]biphenyl), mCP (N,N'-dicarbazolyl-3,5-benzene), and MPMP (bis[4-(N,N-diethylamino)-2-methylphenyl](4-methylphenyl)methane), or a combination thereof, but the exemplary embodiments of the present disclosure are not limited thereto.

[0147] In one or more aspects, the electron blocking layer 144 may include an inorganic compound. For example, the electron blocking layer 144 may include halogen compounds such as LiF, NaF, KF, RbF, CsF, FrF, MgF 2 , CaF 2 , SrF 2 , BaF 2 , and halogen compounds such as LiCl, NaCl, KCl, RbCl, CsCl, FrCl, and inorganic oxides such as Li 2 O, Li 2 O 2 , Na 2 O, K 2 O, Rb 2 O, Rb 2 O 2 , Cs 2 O, Cs 2 O 2 , LiAlO 2 , LiBO 2 , LiTaO 3 , LiNbO 3 , LiWO 4 , Li 2 CO, NaWO 4 , KAlO 2 , K 2 SiO 3 , B 2 O 5 , Al 2 O 3 , SiO 2at least one of oxides such as, or a combination including a halogen compound and an oxide. However, the exemplary embodiments of the present disclosure are not limited thereto.

[0148] The electron blocking layer 144 may act as a buffer layer for blocking direct contact between the hole transport layer 143 and the light emitting layer 145, and function to prevent electrons from easily flowing into the hole transport layer 143.

[0149] For example, the electron blocking layer 144 may improve the efficiency and lifespan of the light emitting element 140 by controlling the injection and movement of electrons and the combination of electrons and holes.

[0150] The electron transport layer 147 may be disposed on the light emitting layer 145.

[0151] The electron transport layer 147 may control the movement speed of electrons such that electrons and holes can meet in the light emitting layer 145 and cause the light emitting layer 145 to emit light.

[0152] The electron transport layer 147 may include a material that allows electrons to move at a speed several times higher than the speed at which electrons move in other materials.

[0153] The electron transport layer 147 may include, for example, Alq 3 (aluminum tris(8-hydroxyquinoline)), PBD, TAZ, spiro-PBD, BAlq, and SAlq, or at least one of their combinations, but the exemplary embodiments of the present disclosure are not limited thereto.

[0154] An electron injection layer (not shown) may be disposed on the electron transport layer 147.

[0155] The electron injection layer (not shown) can transfer electrons flowing in from the second electrode layer 148 to the electron transport layer 147.

[0156] Referring to Figure 5A , the stack of the light emitting element 140 may include a hole blocking layer 146 between the light emitting layer 145 and the electron transport layer 147.

[0157] However, the exemplary embodiments of the present disclosure are not limited thereto. For example, the stack of the light emitting element 140 may not include the hole blocking layer 146.

[0158] The hole blocking layer 146 may act as a buffer layer for blocking direct contact between the electron transport layer 147 and the light emitting layer 145, and function to prevent holes from easily flowing into the electron transport layer 147.

[0159] For example, the hole blocking layer 146 may improve the efficiency and lifespan of the light emitting element 140 by controlling the injection and movement of holes and the combination of holes and electrons.

[0160] As described above, an example in which each light-emitting element has a single-stack structure has been described with reference to Figure 5A Hereinafter, another example in which each light-emitting element 240 has a multi-stack structure will be described with reference to

[0161] As described above, an example in which each light-emitting element has a single-stack structure has been described with reference to Figure 5B Hereinafter, another example in which each light-emitting element 240 has a multi-stack structure will be described with reference to

[0162] With reference to Figure 5B in one or more example embodiments, each light-emitting element ED has a multi-stack structure including a first light-emitting layer 2451 and a second light-emitting layer 2452.

[0163] For example, the first light-emitting layer 2451 and the second light-emitting layer 2452 may include light-emitting materials capable of emitting the same color.

[0164] With reference to Figure 5B each light-emitting element 240 may be composed of a first stack structure including a first light-emitting layer 2451 and a second stack structure including a second light-emitting layer 2452.

[0165] The first hole transport layer 2431, the first electron blocking layer 2441, the first light-emitting layer 2451, the first hole blocking layer 2461, and the first electron transport layer 2471 included in the first stack structure may be the same as or substantially the same as Figure 5A the hole transport layer 143, the electron blocking layer 144, the light-emitting layer 145, the hole blocking layer 146, and the electron transport layer 147 of

[0166] In one or more aspects, in the second stack structure, a charge generation layer 249, a second hole transport layer 2432, a second electron blocking layer 2442, a second light-emitting layer 2452, a second hole blocking layer 2462, and a second electron transport layer 2472 may be disposed between the second electrode layer 248 and the first electron transport layer 2471.

[0167] In one or more aspects, the charge generation layer 249 may be located on the first electron transport layer 2471, the second hole transport layer 2432 may be located on the charge generation layer 249, the second electron blocking layer 2442 may be located on the second hole transport layer 2432, the second light-emitting layer 2452 may be located on the second electron blocking layer 2442, the second hole blocking layer 2462 may be located on the second light-emitting layer 2452, and the second electron transport layer 2472 may be disposed on the second hole blocking layer 2462.

[0168] The second electron transport layer 2472 may be disposed adjacent to the second light-emitting layer 2452 and may transport electrons to the second light-emitting layer 2452.

[0169] The charge generation layer 249 may be disposed between the first electron transport layer 2471 and the second hole transport layer 2432 and may transfer electrons to the first electron transport layer 2471.

[0170] The first hole transport layer 2471 may be disposed adjacent to the first light-emitting layer 2451 and may transfer holes to the first light-emitting layer 2451.

[0171] Although Figure 5B each light-emitting element is shown as including a two-stack structure, the exemplary embodiments of the present disclosure are not limited thereto. For example, each light-emitting element may have other multi-stack structures such as a three-stack structure, a four-stack structure, etc.

[0172] Figure 6A is a cross-sectional view of an exemplary light-emitting element included in each first pixel PG1 (e.g., the first pixel PG1 as described above Figure 3 of the display device 100 according to an aspect of the present disclosure).

[0173] Referring Figure 6A , each of the light-emitting elements included in each first pixel PG1 may include a first electrode layer 141, a second electrode layer 148, and a light-emitting layer 145, and the light-emitting layer 145 is located between the first electrode layer 141 and the second electrode layer 148 and is one of a red light-emitting layer 145R, a green light-emitting layer 145G, and a blue light-emitting layer 145B.

[0174] The light-emitting layer 145 may include at least one of a p-type host PH and an n-type host NH.

[0175] In one or more aspects, in addition to including the p-type host PH and the n-type host NH, the light-emitting layer 145 may further include a phosphorescent dopant (not shown).

[0176] As used herein, the term "p-type host" may refer to a host material having p-type properties.

[0177] The p-type properties may refer to the property of injecting or transporting holes at the highest occupied molecular orbital (HOMO) energy level, i.e., the property of a material having high hole conductivity.

[0178] As used herein, the term "n-type host" may refer to a host material having n-type properties.

[0179] The n-type properties may refer to the property of injecting or transporting electrons at the lowest unoccupied molecular orbital (LUMO) energy level, i.e., the property of a material having high electron conductivity.

[0180] The charge balance between holes and electrons may be adjusted by adjusting the ratio between the p-type host PH, the n-type host NH, and the phosphorescent dopant (not shown) included in the light-emitting layer 145.

[0181] Therefore, by controlling the charge balance, the lifetime of the light-emitting element can be improved by optimizing the position of the recombination region.

[0182] Figure 6B and Figure 6C is a cross-sectional view of an exemplary light-emitting element included in each second pixel PG2 (e.g., the second pixel PG2 of Figure 4 as described above) in the display device according to an aspect of the present disclosure.

[0183] Referring to Figure 6B , each of the light-emitting elements included in each second pixel PG2 may include a first electrode layer 141, a second electrode layer 148, and a light-emitting layer 145, and the light-emitting layer 145 is located between the first electrode layer 141 and the second electrode layer 148 and is one of a red light-emitting layer 145R, a green light-emitting layer 145G, and a blue light-emitting layer 145B.

[0184] The light-emitting layer 145 may include at least one of a p-type host PH and an n-type host NH.

[0185] In one or more aspects, in addition to including the p-type host PH and the n-type host NH, the light-emitting layer 145 may further include a phosphorescent dopant (not shown).

[0186] Referring to Figure 6B , the light-emitting layers (145R, 145G, and 145B) included in each second pixel PG2 may have a higher ratio of the p-type host (PH) than the light-emitting layers (145R, 145G, and 145B) of each first pixel PG1 as described above. Figure 6A For example, the light-emitting layer 145 may satisfy the following formula 1:

[0187] Formula 1

[0188] p1 / (n

[0189] +p 1 +p 1 ) < p 2 / (n 2 +p 2 )

[0190] where p 1 is the number of moles of the p-type host of the light-emitting layer 145 located in the first active region AA1, p 2 is the number of moles of the p-type host of the light-emitting layer 145 located in the second active region AA2, n 1 is the number of moles of the n-type host of the light-emitting layer 145 located in the first active region AAl, and n 2 is the number of moles of the n-type host of the light-emitting layer 145 located in the second active region AA2.

[0191] In the display device 100, when the light-emitting layer 145 satisfies Equation 1, the recombination region in the second active region AA2 can be shifted relative to the light-emitting layer 145 compared to the first active region AA1. As a result, the mobility of holes can be increased compared to that of electrons, which increases the lifespan of the corresponding light-emitting element.

[0192] Therefore, as the lifespan of the light-emitting elements in the second active region AA2 increases, the display device 100 can provide the advantage of reducing the brightness difference between the region where the low-resolution second pixels PG2 are provided and the region where the high-resolution first pixels PG1 are provided even during long-term driving.

[0193] Refer to Figure 6C , the green light-emitting layer 145G included in each second pixel PG2 can have a higher p-type host (PH) ratio than the green light-emitting layer 145G of each first pixel PG1 as described above Figure 6A .

[0194] In addition, the red light-emitting layer 145R and the blue light-emitting layer 145B included in each second pixel PG2 can have substantially the same p-type host (PH) ratio as the red light-emitting layer 145R and the blue light-emitting layer 145B included in each first pixel PG1 as described above Figure 6A .

[0195] Here, substantially the same can mean the degree considered to be equivalent to each other, taking into account the minute differences caused by errors in the process of manufacturing the display panel 110 or the display device 100.

[0196] For example, the green light-emitting layer 145G can satisfy Equation 1 described above, and the red light-emitting layer 145R and the blue light-emitting layer 145B can satisfy Equation 2 below:

[0197] Equation 2

[0198] p1 / (n 1 + p 1 ) = p2 / (n 2 + p 2 )

[0199] where p 1 is the number of moles of the p-type host of the light-emitting layer 145 located in the first active region AA1, p 2 is the number of moles of the p-type host of the light-emitting layer 145 located in the second active region AA2, n 1 is the number of moles of the n-type host of the light-emitting layer 145 located in the first active region AA1, and n 2 is the number of moles of the n-type host of the light-emitting layer 145 located in the second active region AA2.

[0200] In the display device 100, when the green light-emitting layer 145G satisfies Formula 1, the recombination region in the second active region AA2 can be shifted relative to the green light-emitting layer 145G compared to the first active region AA1. As a result, the mobility of holes can be increased compared to electrons, which increases the lifespan of the corresponding light-emitting element.

[0201] Since the ratio of the light emitted by the green light-emitting layer 145G to the total brightness of the display device 100 is 70% or more, the main factor determining the lifespan of the light-emitting elements included in the second active region AA2 can be the green light-emitting layer 145G.

[0202] Therefore, it may be desirable to increase the ratio of the p-type host PH of the green light-emitting layer 145G to increase the lifespan of the light-emitting elements included in the second active region AA2.

[0203] However, the exemplary embodiments of the present disclosure for increasing the ratio of the p-type host PH are not limited to the green light-emitting layer 145G. For example, the type and / or amount of the p-type host PH can be adjusted according to the difference in the acceleration coefficients of the red sub-pixel R, the green sub-pixel G, and the blue sub-pixel B.

[0204] For example, since the acceleration coefficient of the red sub-pixel R is greater than the acceleration coefficients of the green sub-pixel G and the blue sub-pixel B, the amount of the p-type host PH in the red light-emitting layer 145R of the first active region AA1 can be different from the amount of the p-type host PH in the red light-emitting layer 145R of the second active region AA2.

[0205] Therefore, in some examples, it may be desirable to increase the ratio of the p-type host PH of the red light-emitting layer 145R to increase the lifespan of the light-emitting elements included in the second active region AA2.

[0206] Refer to Figure 6A and Figure 6B , further added to increase the p-type host PH whose ratio in the light-emitting layers (145R, 145G, 145B) included in the second active region AA2 located at Figure 6B can be different from the p-type host PH included in the light-emitting layers (145R, 145G, 145B) located in the first active region AA1, but the exemplary embodiments of the present disclosure are not limited thereto.

[0207] Similarly, the p-type host PH further added to increase the ratio of the p-type host included in the green light-emitting layer 145G in the second active region AA2 located at Figure 6C can be different from the p-type host PH included in the green light-emitting layer 145G located in the first active region AA1, but the exemplary embodiments of the present disclosure are not limited thereto.

[0208] For example, the display device 100 may satisfy Equation 1 and simultaneously satisfy the following Equation 3:

[0209] Equation 3

[0210] p 2 = k * p 1 + m * p 0

[0211] Where k is any constant equal to or greater than 1, m is any constant equal to or greater than 0, p 0 is the number of moles of the p-type host different from the p-type host of the light-emitting layer 145 in the first active region AA1, p 1 is the number of moles of the p-type host of the light-emitting layer 145 located in the first active region AA1, p 2 is the number of moles of the p-type host of the light-emitting layer 145 located in the second active region AA2.

[0212] In Equation 3, when k > 1 and m = 0, p 2 = k * p 1 is satisfied. Therefore, the p-type host PH further added to increase the ratio of the p-type host included in the light-emitting layers (145R, 145G, 145B) in the second active region AA2 can be substantially the same as the p-type host PH included in the light-emitting layers (145R, 145G, 145B) in the first active region AA1.

[0213] Similarly, when k > 1 and m = 0, p2 = k * p1 is satisfied. Therefore, the p-type host PH further added to increase the ratio of the p-type host included in the green light-emitting layer 145G in the second active region AA2 can be substantially the same as the p-type host PH included in the green light-emitting layer 145G in the first active region AA1.

[0214] In Equation 3, when k = 1 and m > 0, p2 = p 1 + m * p0 is satisfied. Therefore, the p-type host PH further added to increase the ratio of the p-type host included in the light-emitting layers (145R, 145G, 145B) in the second active region AA2 can be different from the p-type host PH included in the light-emitting layers (145R, 145G, 145B) in the first active region AA1.

[0215] Similarly, when k = 1 and m > 0, p2 = p 1+m*p0. Accordingly, the p-type host PH further added to increase the ratio of the p-type host included in the green light-emitting layer 145G in the second active region AA2 may be different from the p-type host PH included in the green light-emitting layer 145G in the first active region AA1.

[0216] Accordingly, the p-type host added to increase the p-type host ratio may be the same as or different from the p-type host that was already included before adding the p-type host to increase the p-type host ratio. As will be described later, this can be achieved by enabling the type and / or amount of the p-type host to be adjusted using the thin film deposition apparatus 300 for manufacturing the light-emitting element.

[0217] Figure 7A is another cross-sectional view of an exemplary light-emitting element included in the first pixel (e.g., the first pixel PG1 as described above Figure 3 of the display device 100 according to an aspect of the present disclosure.

[0218] Referring Figure 7A , each of the light-emitting elements included in each first pixel PG1 may include a first electrode layer 141, a second electrode layer 148, and a light-emitting layer 145, and the light-emitting layer 145 is located between the first electrode layer 141 and the second electrode layer 148 and is one of a red light-emitting layer 145R, a green light-emitting layer 145G, and a blue light-emitting layer 145B.

[0219] In addition, the red light-emitting layer 145R, the green light-emitting layer 145G, and the blue light-emitting layer 145B may each include a first layer (1451R, 1451G, 1451B) including a p-type host PH and an n-type host NH.

[0220] In one or more aspects, in addition to including the p-type host PH and the n-type host NH, the light-emitting layer 145 may further include a phosphorescent dopant (not shown).

[0221] Figure 7B and Figure 7C are other cross-sectional views of exemplary light-emitting elements included in each second pixel (e.g., the second pixel PG2 as described above Figure 4 of the display device according to an aspect of the present disclosure.

[0222] Referring Figure 7B , each of the light-emitting elements included in each second pixel PG2 may include a first electrode layer 141, a second electrode layer 148, and a light-emitting layer 145, and the light-emitting layer 145 is located between the first electrode layer 141 and the second electrode layer 148 and is one of a red light-emitting layer 145R, a green light-emitting layer 145G, and a blue light-emitting layer 145B.

[0223] In addition, each of the red light-emitting layer 145R, the green light-emitting layer 145G, and the blue light-emitting layer 145B may include: respective first layers (1451R, 1451G, 1451B) each including a p-type host PH and an n-type host NH; and respective second layers (1452R, 1452G, 1452B) located on the surface of the first layer and including a p-type host.

[0224] In one or more aspects, when the first electrode layer 141 is an anode and the second electrode layer 148 is a cathode, the second layer may be located between the first layer and the first electrode layer 141.

[0225] However, the exemplary embodiments of the present disclosure are not limited thereto. For example, when the first electrode layer 141 is a cathode and the second electrode layer 148 is an anode, the second layer may be located between the first layer and the second electrode layer 148.

[0226] Referring to Figure 7A and Figure 7B In the display device 100, when the second layers (1452R, 1452G, 1452B) including a p-type host are deposited on the respective surfaces of the first layers (1451R, 1451G, 1451B) including a p-type host and an n-type host, the overall ratio of the p-type host in the light-emitting layer 145 can be increased.

[0227] Therefore, as the ratio of the p-type host in the light-emitting layer 145 increases, the recombination region in the second active region AA2 can be shifted with respect to the light-emitting layer 145 compared to the first active region AA1. As a result, the mobility of holes can be increased compared to electrons, which increases the lifetime of the corresponding light-emitting element.

[0228] Therefore, as the lifetime of the light-emitting elements in the second active region AA2 increases, the display device 100 can provide the advantage of reducing the brightness difference between the region provided with the low-resolution second pixels PG2 and the region provided with the high-resolution first pixels PG1 even when driven for a long time.

[0229] Referring to Figure 7C the green light-emitting layer 145G may include: a first layer 1451G including a p-type host PH and an n-type host NH; and a second layer 1452G located on the surface of the first layer and including a p-type host.

[0230] In addition, each of the red light-emitting layer 145R and the blue light-emitting layer 145B may include respective first layers (1451R and 1451B) including a p-type host PH and an n-type host NH. As shown, the green light-emitting layer 145G includes a second layer 1452G including a p-type host, and the adjacent blue light-emitting layer 145B or red light-emitting layer 145R does not have a second layer.

[0231] As the ratio of the p-type host increases due to the second layer 1452G of the green light-emitting layer 145G, the recombination region in the second active region AA2 can be shifted relative to the green light-emitting layer 145G compared to the first active region AA1. As a result, the mobility of holes can increase compared to that of electrons, which increases the lifetime of the corresponding light-emitting element.

[0232] Since the ratio of the light emitted by the green light-emitting layer 145G to the total luminance of the display device 100 is 70% or more, the main factor determining the lifetime of the light-emitting elements included in the second active region AA2 can be the green light-emitting layer 145G.

[0233] Therefore, as the ratio of the p-type host of the green light-emitting layer 145G increases, the lifetime of the light-emitting elements in the second active region AA2 can increase, and even when driven for a long time, the display device 100 can provide the advantage of reducing the luminance difference between the region provided with the low-resolution second pixel PG2 and the region provided with the high-resolution first pixel PG1.

[0234] Refer to Figure 7A and Figure 7B , the second layer (1452R, 1452G, 1452B) containing the p-type host PH can be deposited on the respective surfaces of the first layer (1451R, 1451G, 1451B) to increase the ratio of the p-type host PH included in the light-emitting layers (145R, 145G, and 145B) in the second active region AA2 located at Figure 7B . In this embodiment, the ratio of the p-type host PH in the first layer (1451R, 1451G, 1451B) can be different from that of the p-type host PH in the second layer (1452R, 1452G, 1452B). However, the exemplary embodiments of the present disclosure are not limited thereto.

[0235] Similarly, the second layer 1452G containing the p-type host PH can be deposited on the surface of the first layer 1451G to increase the ratio of the p-type host PH included in the green light-emitting layer 145G in the second active region AA2 located at Figure 7C . In this embodiment, the ratio of the p-type host PH in the first layer 1451G can be different from that of the p-type host PH in the second layer 1452G. However, the exemplary embodiments of the present disclosure are not limited thereto.

[0236] Therefore, in order to increase the ratio of the p-type host, the p-type host included in the second layer can be the same as or different from the p-type host included in the first layer. As described below, this can be achieved by using the thin-film deposition apparatus 300 to enable the type and / or amount of the p-type host PH in the second layer to be adjusted.

[0237] Figure 8is a front view of an exemplary thin film deposition apparatus for manufacturing a light emitting element according to an aspect of the present disclosure.

[0238] Referring Figure 8 , the thin film deposition apparatus 300 for manufacturing a light emitting element may include a source unit 330 having a nozzle 310 configured to eject a deposition material 320 to provide the deposition material 320.

[0239] Referring Figure 8 , the thin film deposition apparatus 300 for manufacturing a light emitting element may include a first rotation shaft 420a and a second rotation shaft 420b disposed close to each other. The first rotation shaft 420a and the second rotation shaft 420b can open or close their respective nozzles 310 while rotating in the same direction.

[0240] In addition, the thin film deposition apparatus 300 may further include a third rotation shaft 420c and a third cover 410c connected to the third rotation shaft 420c. The third cover 410c can open or close the nozzle 310 while rotating in a direction opposite to the rotation direction of the first rotation shaft 420a and the second rotation shaft 420b.

[0241] Even when the first rotation shaft 420a and the second rotation shaft 420b are set to be spaced apart from each other and rotate in the same direction, the deposition material 320 may not be deposited on the second cover 410b depending on the length of the first cover 410a or the second cover 410b and the ejection angle of the nozzle 310. In this case, the first rotation shaft 420a and the second rotation shaft 420b can be set to be spaced apart from each other and then can rotate in the same direction.

[0242] In one or more aspects, the first cover 410a may have a length sufficient to close the first nozzle 310a to open or close the first nozzle 310a. In one or more aspects, since the second cover 410b may need to open or close the second nozzle 310b disposed on one side of the first nozzle 310a, the second cover 410b may have a length sufficient to close both the first nozzle 310a and the second nozzle 310a.

[0243] For example, in the case where the second rotation shaft 420b is disposed close to the first rotation shaft 420a, the second cover 410b can close the second nozzle 310b by the rotation of the second cover 410b and the first cover 410a in the same direction.

[0244] Referring Figure 8 , the second cover 410b can be opened at a larger angle than the first cover 410a.

[0245] In this embodiment, even when the deposition material 320 is ejected through the nozzle 310, the deposition material 320 may not contact the second cover 410b, and thus, deposition of the deposition material 320 on the second cover 410b can be prevented.

[0246] In addition, the first cover 410a can prevent the deposition material 320 from depositing on the first cover 410a by changing the opening angle of the first cover 410a according to the ejection angle of the deposition material 320.

[0247] In one or more aspects, a plurality of deposition materials 320 and a plurality of nozzles 310 can be provided. For example, two or more deposition materials 320 and two or more nozzles 310 can be provided in the thin film deposition apparatus 300.

[0248] As Figure 8 shown, when three deposition materials 320 and three nozzles 310 are provided, the first cover 410a and the second cover 410b among the three covers 410 can rotate in the same direction, and the third cover 410c can rotate in the opposite direction.

[0249] By selectively opening the three covers 410, deposition can be selectively performed on each of the deposition material 320 ejected from the first nozzle 310a, the deposition material 320 ejected from the second nozzle 310b, and the deposition material 320 ejected from the third nozzle 310c.

[0250] For example, the deposition material 320 ejected from the first nozzle 310a can be a p-type host material, the deposition material 320 ejected from the second nozzle 310b can be a phosphorescent dopant, and the deposition material 320 ejected from the third nozzle 310c can be a mixture of a p-type host and an n-type host.

[0251] In this example, the p-type host ejected from the first nozzle 310a and the p-type host ejected from the third nozzle 310c can be the same or different.

[0252] In this embodiment, as described above, the cover 410 of the thin film deposition apparatus 300 for manufacturing a light emitting element can be manipulated such that the display device 100 satisfies the following Formula 1:

[0253] Formula 1

[0254] p1 / (n 1 +p 1 ) < p2 / (n 2 +p 2 )

[0255] Wherein, p1 is located in the first active region AA1 (for example, as described above Figure 3The number of moles of the p-type host of the light-emitting layer 145 (e.g., the light-emitting layer 145 in the figures discussed above) in the first active region AA1, p 2 is the number of moles of the p-type host of the light-emitting layer 145 (e.g., the light-emitting layer 145 in the figures discussed above) in the second active region AA2 (e.g., as described above Figure 4 of the second active region AA2), n 1 is the number of moles of the n-type host of the light-emitting layer 145 in the first active region AA1, n 2 is the number of moles of the n-type host of the light-emitting layer 145 in the second active region AA2.

[0256] In one example, when forming the light-emitting layer 145 in the first active region AA1, the first cover 410a can be rotated clockwise to close the first nozzle 310a, and the second cover 410b and the third cover 410c can be opened to open the second nozzle 310b and the third nozzle 310c.

[0257] Accordingly, the first nozzle 310a can be closed, and the second nozzle 310b and the third nozzle 310c can be opened. Thus, the light-emitting layer 145 can be formed to include a phosphorescent dopant as the deposition material 320 ejected from the second nozzle 310b and a mixture of a p-type host and an n-type host as the deposition material 320 ejected from the third nozzle 310c.

[0258] In one example, when forming the light-emitting layer 145 in the second active region AA2, the first cover 410a, the second cover 410b, and the third cover 410c can be opened to open the first nozzle 310a, the second nozzle 310b, and the third nozzle 310c.

[0259] Accordingly, the first nozzle 310a, the second nozzle 310b, and the third nozzle 310c can be opened. Thus, the p-type host ratio of the light-emitting layer 145 in the second active region AA2 can be increased by additionally depositing a p-type host as the deposition material 320 ejected from the first nozzle 310a, a phosphorescent dopant as the deposition material 320 ejected from the second nozzle 310b, and a mixture of a p-type host and an n-type host as the deposition material 320 ejected from the third nozzle 310c.

[0260] For example, the light-emitting layer 145 can be a green light-emitting layer 145G.

[0261] In another example, the deposition material 320 ejected from the first nozzle 310a can be a mixture of a p-type host and an n-type host, the deposition material 320 ejected from the second nozzle 310b can be a phosphorescent dopant, and the deposition material 320 ejected from the third nozzle 310c can be a p-type host.

[0262] In this example, the p-type bodies ejected from the first nozzle 310a and the p-type bodies ejected from the third nozzle 310c may be the same or different.

[0263] In this embodiment, as described above, at the stage of forming the first layer (1451R, 1451G, and 1451B) including the p-type body and the n-type body, the third cover 410c may rotate counterclockwise to close the third nozzle 310c, and the first cover 410a and the second cover 410b may be opened to open the first nozzle 310a and the second nozzle 310b.

[0264] Accordingly, the first layer (1451R, 1451G, and 1451B) may include the p-type body and the n-type body.

[0265] In addition, at the stage of forming the second layer (1452R, 1452G, 1452B) including the p-type body, the first cover 410a may rotate clockwise to close the first nozzle 310a, and the second cover 410b and the third cover 410c may be opened to open the second nozzle 310b and the third nozzle 310c.

[0266] Accordingly, the second layer (1452R, 1452G, 1452B) may include the p-type body.

[0267] In this embodiment, for example, the first layer and the second layer may be the first layer 1451G and the second layer 1452G of the green light-emitting layer 145G.

[0268] Figure 9 is a graph showing the lifetime and intensity of the green sub-pixels with respect to the p-type body ratio in the display device 100 according to an aspect of the present disclosure.

[0269] Table 1 below shows the results corresponding to Figure 9 the graph of.

[0270] Table 1

[0271] p-Type body ratio Threshold voltage (V) Drive voltage (V) Efficiency (%) Lifetime (%) <![CDATA[PH 0％P > 0.0 0.0 100.0 100.0 <![CDATA[PH 5％P > -0.02 0.0 99.6 158.4 <![CDATA[PH 10％P > -0.05 0.0 99.1 223.4

[0272] Referring to Figure 9 and Table 1, when the p-type body ratio (p / (n + p)) is increased by 5% P (PH 0％P ) or 10% P (PH 5％P ) compared to a comparative example (PH 10％P ) in which the present disclosure is not applied, it can be seen that the time (lifetime) required to reach 95% intensity increases.

[0273] In other words, as the p-type body ratio increases, the lifetime may increase.

[0274] Figure 10It shows the lifespan of the green sub-pixels in the display device 100 according to aspects of the present disclosure with respect to the p-type body molar ratio (PH Figure 4 / PH Figure 3 ) of the second active region AA2 (e.g., the second active region AA2 as described above AA2 ) and the first active region AA1 (e.g., the first active region AA1 as described above AA1 ).

[0275] Referring to Figure 10 , as the p-type body molar ratio (PH AA2 / PH AA1 ) of the second active region AA2 and the first active region AA1 increases, it can be seen that the lifespan of the green sub-pixels increases.

[0276] Figure 11 It shows the pixel area ratio (PG Figure 4 / PG Figure 3 ) of the second active region AA2 (e.g., the second active region AA2 as described above AA2 ) and the first active region AA1 (e.g., the first active region AA1 as described above AA1 ) in the display device 100 according to aspects of the present disclosure with respect to the p-type body molar ratio (PH AA2 / PH AA1 ).

[0277] Referring to Figure 11 , as the p-type body molar ratio (PH AA2 / PH AA1 ) of the second active region AA2 and the first active region AA1 increases, it can be seen that the pixel area ratio (PG AA2 / PG AA1 ) of the second active region AA2 and the first active region AA1 decreases.

[0278] However, as described above, it is not limited to green sub-pixels. For example, as shown in Table 2, even in red sub-pixels and blue sub-pixels, as the p-type body molar ratio (PH AA2 / PH AA1 ) of the second active region AA2 and the first active region AA1 increases, the lifespan of the red sub-pixels and blue sub-pixels can also increase.

[0279] Table 2

[0280]

[0281]

[0282]

[0283] Referring to Table 2, the p-type body ratio can be different to reduce the lifetime difference between the first active region AA1 and the second active region AA2 due to the difference in acceleration coefficients among the red sub-pixels, green sub-pixels, and blue sub-pixels.

[0284] For example, in the green sub-pixel, when the pixel area ratio of the second active region AA2 to the first active region AA1 (PG AA2 / PG AA1 ) is 0.5, the current ratio of the second active region AA2 to the first active region AA1 (CA A2 / CA A1 ) can become 2, and compared with the case where the pixel area ratio of the second active region AA2 to the first active region AA1 (PG AA2 / PG AA1 ) is 1, the lifetime L AA2 of the second active region AA2 can be reduced to 32%.

[0285] Therefore, compared with the case where the pixel area ratio of the second active region AA2 to the first active region AA1 (PG AA2 / PG AA1 ) is 1, the required lifetime (RQL AA2 ) to reduce the difference between the first active region AA1 and the second active region AA2 can be increased to 313%.

[0286] Therefore, to compensate for the required lifetime, p-type body can be further deposited so that the molar ratio of the p-type body of the second active region AA2 to the first active region AA1 (PH AA2 / PH AA1 ) can be 1.09.

[0287] The exemplary embodiments described above will be briefly described as follows.

[0288] According to an exemplary embodiment described herein, a display device can be provided, including: a first active region in which a plurality of first pixels are disposed, the first active region having a first resolution; a second active region in which a plurality of second pixels are disposed, the second active region having a second resolution less than the first resolution; and a plurality of light-emitting elements disposed in each of the plurality of first pixels and the plurality of second pixels. Each of the plurality of light-emitting elements can include a first electrode layer, a second electrode layer, and a light-emitting layer, the light-emitting layer being located between the first electrode layer and the second electrode layer and being any one of a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer. The light-emitting layer can include at least one of a p-type host and an n-type host, and at least one of the red light-emitting layer, the green light-emitting layer, and the blue light-emitting layer can be configured to satisfy the following Formula 1:

[0289] Formula 1

[0290] p 1 / (n 1 +p 1 )<p 2 / (n 2 +p 2 )

[0291] Wherein, p 1 can be the number of moles of the p-type host of the light-emitting layer located in the first active region, p 2 can be the number of moles of the p-type host of the light-emitting layer located in the second active region, n 1 is the number of moles of the n-type host of the light-emitting layer located in the first active region, n 2 is the number of moles of the n-type host of the light-emitting layer located in the second active region.

[0292] In one or more aspects, the green light-emitting layer can be configured to satisfy Formula 1, and the red light-emitting layer and the blue light-emitting layer can be configured to satisfy the following Formula 2:

[0293] Formula 2

[0294] p 1 / (n 1 +p 1 )=p 2 / (n 2 +p 2 )

[0295] Wherein, p 1 can be the number of moles of the p-type host of the light-emitting layer located in the first active region, p 2 can be the number of moles of the p-type host of the light-emitting layer located in the second active region, n 1can be the number of moles of the n-type host of the light-emitting layer in the first active region, n 2 can be the number of moles of the n-type host of the light-emitting layer in the second active region.

[0296] In one or more aspects, at least one of the red light-emitting layer, the green light-emitting layer, and the blue light-emitting layer can be configured to satisfy the following Formula 1 and Formula 3:

[0297] Formula 1

[0298] p 1 / (n 1 +p 1 ) < p 2 / (n 2 +p 2 )

[0299] Formula 3

[0300] p 2 = k * p 1 + m * p 0

[0301] Wherein, k can be any constant equal to or greater than 1, m can be any constant equal to or greater than 0, p 0 can be the number of moles of the p-type host different from the p-type host of the light-emitting layer in the first active region, p 1 can be the number of moles of the p-type host of the light-emitting layer in the first active region, p 2 can be the number of moles of the p-type host of the light-emitting layer in the second active region, n 1 can be the number of moles of the n-type host of the light-emitting layer in the first active region, n 2 can be the number of moles of the n-type host of the light-emitting layer in the second active region.

[0302] In one or more aspects, k can be greater than 1, and m can be equal to 0.

[0303] In one or more aspects, k can be equal to 1, and m can be greater than 0.

[0304] In one or more aspects, the light-emitting layer can further include a phosphorescent dopant.

[0305] According to an exemplary embodiment described herein, a display device may be provided, including: a first active region in which a plurality of first pixels are disposed, the first active region having a first resolution; a second active region in which a plurality of second pixels are disposed, the second active region having a second resolution less than the first resolution; and a plurality of light-emitting elements disposed in each of the plurality of first pixels and the plurality of second pixels. Each of the plurality of light-emitting elements may include a first electrode layer, a second electrode layer, and a light-emitting layer, the light-emitting layer being located between the first electrode layer and the second electrode layer and being any one of a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer. The light-emitting layer may include at least one of a p-type host and an n-type host. At least one of the red light-emitting layer, the green light-emitting layer, and the blue light-emitting layer located in the second active region may include a first layer including a p-type host and an n-type host and a second layer located on a surface of the first layer and including a p-type host. At least one of the red light-emitting layer, the green light-emitting layer, and the blue light-emitting layer located in the first active region may include a first layer including a p-type host and an n-type host.

[0306] In one or more aspects, the green light-emitting layer located in the second active region may include a first layer including a p-type host and an n-type host and a second layer located on the first layer and including a p-type host, and the green light-emitting layer located in the first active region may include a first layer including a p-type host and an n-type host.

[0307] In one or more aspects, the p-type host of the first layer and the p-type host of the second layer may be the same as each other.

[0308] In one or more aspects, the p-type host of the first layer and the p-type host of the second layer may be different from each other.

[0309] In one or more aspects, the first electrode layer may be an anode, the second electrode layer may be a cathode, and the second layer may be located between the first layer and the first electrode layer.

[0310] In one or more aspects, the light-emitting layer may further include a phosphorescent dopant.

[0311] The foregoing description has been presented to enable any person skilled in the art to make, use, and practice the technical features of the present disclosure, and the foregoing description has been provided as an example in the context of a particular application and its requirements. Various modifications, additions, and substitutions to the described embodiments will be apparent to those skilled in the art, and the principles described herein may be applied to other embodiments and applications without departing from the scope of the present disclosure. The above description and drawings provide examples of the technical features of the present disclosure for illustrative purposes only. That is, the disclosed embodiments are intended to illustrate the scope of the technical features of the present disclosure.

[0312] The various embodiments described above may be combined to provide further embodiments. All U.S. patents, U.S. patent application publications, U.S. patent applications, foreign patents, foreign patent applications, and non-patent publications mentioned in this specification and / or listed in the Application Data Sheet are hereby incorporated by reference in their entirety. Aspects of the embodiments may be modified to provide further embodiments if concepts of various patents, applications, and publications are employed.

[0313] These and other changes may be made to the embodiments in light of the above detailed description. In general, in the following claims, the terms used should not be construed as limiting the claims to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments and the full scope of equivalents of the claimed subject matter. Thus, the claims are not limited by the disclosure.

Claims

1. A display device, comprising: A first active area, in which a plurality of first pixels are arranged, and the first active area has a first resolution; a second active area, in which a plurality of second pixels are arranged, and the second active area has a second resolution smaller than the first resolution; as well as a plurality of light emitting elements, the plurality of light emitting elements being disposed in each of the plurality of first pixels and the plurality of second pixels, Each of the plurality of light-emitting elements includes a first electrode layer, a second electrode layer, and a light-emitting layer, wherein the light-emitting layer is located between the first electrode layer and the second electrode layer and is any one of a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer, and The light-emitting layer includes at least one of a p-type host and an n-type host, and at least one of the red light-emitting layer, the green light-emitting layer, and the blue light-emitting layer is configured to satisfy the following formula 1: Formula 1 p1 / (n1+p1)<p2 / (n2+p2) Among them, p1 is the molar number of the p-type main body of the light-emitting layer located in the first active region, p2 is the molar number of the p-type main body of the light-emitting layer located in the second active region, n1 is the molar number of the n-type main body of the light-emitting layer located in the first active region, and n2 is the molar number of the n-type main body of the light-emitting layer located in the second active region.

2. The display device according to claim 1, wherein: The green light emitting layer is configured to satisfy Formula 1, and the red light emitting layer and the blue light emitting layer are configured to satisfy the following Formula 2: Formula 2 p1 / (n1+p1)=p2 / (n2+p2).

3. The display device according to claim 1, wherein: At least one of the red light emitting layer, the green light emitting layer, and the blue light emitting layer is configured to satisfy the following Formula 1 and Formula 3: Formula 1 p1 / (n1+p1) <p2 / (n2+p2) Formula 3 p2=k*p1+m*p0 wherein k is an arbitrary constant equal to or greater than 1, m is an arbitrary constant equal to or greater than 0, and p0 is the number of moles of a p-type host different from the p-type host of the light emitting layer in the first active region.

4. The display device according to claim 3, wherein: k is greater than 1, and m is equal to 0.

5. The display device according to claim 3, wherein: k is equal to 1, and m is greater than zero.

6. The display device according to claim 1, wherein: The light-emitting layer also includes a phosphorescent dopant.

7. A display device, comprising: A first active area, in which a plurality of first pixels are arranged, and the first active area has a first resolution; a second active area, in which a plurality of second pixels are arranged, and the second active area has a second resolution smaller than the first resolution; as well as a plurality of light emitting elements, the plurality of light emitting elements being disposed in each of the plurality of first pixels and the plurality of second pixels, Each of the plurality of light-emitting elements includes a first electrode layer, a second electrode layer, and a light-emitting layer, wherein the light-emitting layer is located between the first electrode layer and the second electrode layer and is any one of a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer. The light-emitting layer includes at least one of a p-type host and an n-type host. wherein at least one of the red light emitting layer, the green light emitting layer, and the blue light emitting layer located in the second active region includes a first layer including the p-type host and the n-type host and a second layer located on the first layer and including the p-type host, and Wherein, at least one of the red light emitting layer, the green light emitting layer, and the blue light emitting layer located in the first active region includes a first layer including the p-type host and the n-type host.

8. The display device according to claim 7, wherein: The green light emitting layer located in the second active region includes: a first layer including the p-type host and the n-type host; and a second layer located on the first layer and including the p-type host, and The green light-emitting layer located in the first active region includes a first layer including the p-type main body and the n-type main body.

9. The display device according to claim 7, wherein: The p-type body of the first layer and the p-type body of the second layer are identical to each other.

10. The display device according to claim 7, wherein: The p-type body of the first layer and the p-type body of the second layer are different from each other.

11. The display device according to claim 7, wherein: The first electrode layer is an anode, the second electrode layer is a cathode, and Wherein, the second layer is located between the first layer and the first electrode layer.

12. The display device according to claim 7, wherein: The light-emitting layer also includes a phosphorescent dopant.

13. A display device, comprising: a first active area, in which a plurality of first pixels are arranged; a second active area, in which a plurality of second pixels are arranged; as well as A plurality of light emitting elements, the plurality of light emitting elements being disposed in each of the plurality of first pixels and the plurality of second pixels, each of the plurality of light emitting elements comprising: a first electrode layer; a second electrode layer; and a light-emitting layer, the light-emitting layer being located between the first electrode layer and the second electrode layer, the light-emitting layer having a first layer including at least one of a p-type host and an n-type host, wherein the light-emitting layer is any one of a red light-emitting layer, a green light-emitting layer and a blue light-emitting layer, and The density of the plurality of first pixels in the first active area is greater than the density of the plurality of second pixels in the second active area.

14. The display device according to claim 13, wherein: The light-emitting layer includes a second layer adjacent to the first layer, Wherein, the second layer includes the p-type main body.

15. The display device according to claim 14, wherein: The second layer does not include the n-type body.

16. The display device according to claim 14, wherein: The light-emitting layer is a green light-emitting layer, Wherein, p1 is the number of moles of the p-type host of the light-emitting layer located in the first active region, wherein n1 is the number of moles of the n-type host of the light-emitting layer located in the first active region, Wherein, p2 is the number of moles of the p-type host of the light-emitting layer located in the second active region, wherein n2 is the number of moles of the n-type host of the light-emitting layer located in the second active region, Among them, the relationship between p1, n1, p2 and n2 is expressed as p1 / (n1+p1) <p2 / (n2+p2)。 17. The display device according to claim 14, wherein: The light-emitting layer is a red light-emitting layer or a blue light-emitting layer, Wherein, p1 is the number of moles of the p-type host of the light-emitting layer located in the first active region, wherein n1 is the number of moles of the n-type host of the light-emitting layer located in the first active region, Wherein, p2 is the number of moles of the p-type host of the light-emitting layer located in the second active region, wherein n2 is the number of moles of the n-type host of the light-emitting layer located in the second active region, Here, the relationship among p1, n1, p2 and n2 is expressed as p1 / (n1+p1)=p2 / (n2+p2).

18. The display device according to claim 14, wherein: p1 is the number of moles of the p-type host of the light-emitting layer located in the first active region, wherein n1 is the number of moles of the n-type host of the light-emitting layer located in the first active region, Wherein, p2 is the number of moles of the p-type host of the light-emitting layer located in the second active region, wherein n2 is the number of moles of the n-type host of the light-emitting layer located in the second active region, Among them, the relationship between p1, n1, p2 and n2 is expressed as p1 / (n1+p1) <p2 / (n2+p2), Where k is any constant equal to or greater than 1, Where m is any constant equal to or greater than 0, wherein p0 is the number of moles of a p-type host different from the p-type host of the light-emitting layer located in the first active region, and Among them, the relationship among p0, p1, p2, m, and k is expressed as p2=k*p1+m*p0.

19. The display device according to claim 18, wherein: k is greater than 1 and m is equal to 0, or k is equal to 1 and m is greater than zero.

20. The display device according to claim 13, wherein: The green light emitting layer includes a second layer adjacent to the first layer, wherein the second layer of the green light-emitting layer comprises the p-type host, The adjacent blue light-emitting layer or red light-emitting layer does not have a second layer including the p-type host.

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