Display device

Abstract

A display device includes a light emitting element disposed on a substrate. The capping layer, the anti-reflection layer, and the encapsulation layer are sequentially disposed on the light emitting element. The capping layer includes: a first capping layer disposed on the light emitting element; and a second capping layer disposed on the first capping layer and having a refractive index greater than a refractive index of the first capping layer. The thickness of the first capping layer is in the range of about # imgabs0 # to about # imgabs1 #, and the thickness of the second capping layer is in the range of about # imgabs2 # to about # imgabs3 #.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2023-0097677, filed on Jul. 26, 2023, which is hereby incorporated by reference in its entirety. Technical Field

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

[0004] The display device can display an image. Since external light is reflected on the surface of the display device, the display quality of the display device may be reduced. In order to solve this problem, a polarizing film and a color filter, etc. are used in the display device. Research has been conducted to suppress or minimize the reflection of external light. Summary of the invention

[0005] The embodiment provides a display device capable of reducing or minimizing external light reflection.

[0006] However, the embodiments of the present disclosure are not limited to those described herein.The above and other embodiments will become more apparent to those skilled in the art to which the present disclosure pertains by referring to the detailed description of the present disclosure given below.

[0007] According to an embodiment, the display device includes: a light emitting element disposed on a substrate; a capping layer disposed on the light emitting element; an anti-reflection layer disposed on the capping layer; and an encapsulation layer disposed on the anti-reflection layer. The capping layer includes: a first capping layer disposed on the light emitting element; and a second capping layer disposed on the first capping layer and having a refractive index greater than that of the first capping layer. The thickness of the first capping layer may be about To about and the thickness of the second capping layer may be in the range of about To about within the range.

[0008] The anti-reflection layer may include ytterbium or bismuth, and the first capping layer and the second capping layer may include an inorganic material.

[0009] The total thickness of the capping layer can be approximately To about within the range.

[0010] The refractive index of the second capping layer may be greater than that of the first capping layer by about 0.1 or more, the refractive index of the first capping layer may be in the range of about 1.2 to about 1.7, and the refractive index of the second capping layer may be in the range of about 1.7 to about 2.2.

[0011] The thickness of the first capping layer may be approximately To about and the thickness of the second capping layer may be in the range of about To about within the range of

[0012] The total thickness of the first capping layer and the second capping layer may be approximately To about within the range.

[0013] The capping layer may further include a third capping layer disposed between the second capping layer and the anti-reflection layer and having a refractive index smaller than that of the second capping layer, and the thickness of the third capping layer may be about To about within the range.

[0014] The refractive index of the second capping layer may be approximately 0.1 or more greater than the refractive index of each of the first capping layer and the third capping layer, the refractive index of the first capping layer may be in the range of approximately 1.2 to approximately 1.7, the refractive index of the second capping layer may be in the range of approximately 1.7 to approximately 2.2, and the refractive index of the third capping layer may be in the range of approximately 1.2 to approximately 1.7.

[0015] The thickness of the first capping layer may be approximately To about In the range of To about and the thickness of the third capping layer may be in the range of about To about within the range.

[0016] The total thickness of the first capping layer, the second capping layer and the third capping layer may be approximately To about within the range.

[0017] The light emitting element may include: a first electrode; a light emitting layer disposed on the first electrode; and a second electrode disposed on the light emitting layer, and the capping layer may be disposed between the second electrode and the anti-reflection layer.

[0018] According to an embodiment, a display device includes: a light emitting element disposed on a substrate; a capping layer disposed on the light emitting element; an anti-reflection layer disposed on the capping layer; and an encapsulation layer disposed on the anti-reflection layer. The capping layer includes: a first capping layer disposed on the light emitting element; a second capping layer disposed on the first capping layer and having a refractive index smaller than that of the first capping layer; and a third capping layer disposed on the second capping layer and having a refractive index greater than that of the second capping layer. The thickness of the first capping layer may be about To about In the range of To about and the thickness of the third capping layer may be in the range of about To about within the range.

[0019] The refractive index of the second capping layer may be approximately 0.1 or more less than the refractive index of each of the first capping layer and the third capping layer, the refractive index of the first capping layer may be in the range of approximately 1.7 to approximately 2.2, the refractive index of the second capping layer may be in the range of approximately 1.2 to approximately 1.7, and the refractive index of the third capping layer may be in the range of approximately 1.7 to approximately 2.2.

[0020] The thickness of the first capping layer may be approximately To about In the range of To about and the thickness of the third capping layer may be in the range of about To about within the range.

[0021] The total thickness of the capping layer can be approximately To about within the range.

[0022] The light emitting element may include: a first electrode; a light emitting layer disposed on the first electrode; and a second electrode disposed on the light emitting layer, and the capping layer may be disposed between the second electrode and the anti-reflection layer.

[0023] According to an embodiment, a display device includes: a light emitting element disposed on a substrate; a first capping layer disposed on the light emitting element; an anti-reflection layer disposed on the first capping layer; and an encapsulation layer disposed on the anti-reflection layer. The refractive index of the first capping layer may be in the range of about 1.2 to about 1.7, and the thickness of the first capping layer may be about To about within the range.

[0024] The thickness of the first capping layer may be approximately To about within the range.

[0025] The light emitting element may include: a first electrode; a light emitting layer disposed on the first electrode; and a second electrode disposed on the light emitting layer, and the first capping layer may be disposed between the second electrode and the anti-reflection layer.

[0026] The display device may further include: a second capping layer, disposed on at least one of the first surface and the second surface of the first capping layer, the refractive index of the second capping layer may be approximately 0.1 or more greater than the refractive index of the first capping layer, and the refractive index of the second capping layer may be in the range of approximately 1.7 to approximately 2.2.

[0027] Details of other embodiments are included in the detailed description and accompanying drawings.

[0028] The display device according to the embodiment may include a capping layer and an anti-reflection layer disposed between the light emitting element and the encapsulation layer, the capping layer may include a low refractive index capping layer having a refractive index of about 1.2 to about 1.7, and the thickness of the capping layer may be about 1000 Å. To about For example, the capping layer can offset the external light using the phase difference of the external light reflected from the capping layer. Accordingly, the reflectivity of the external light can be reduced, and the display quality of the display device can be improved.

[0029] The effects according to the embodiments are not limited to the above-exemplified contents, and more various effects are included in the specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and other features of the present disclosure will become more apparent by describing the embodiments of the present disclosure in more detail with reference to the accompanying drawings, in which:

[0031] Figure 1 is a schematic diagram illustrating a display device according to an embodiment;

[0032] Figure 2 It is a graphic Figure 1 A schematic cross-sectional view of an embodiment of a display device;

[0033] Figure 3 The diagram is included in Figure 1 A schematic cross-sectional view of an embodiment of a display unit in a display device of ;

[0034] Figure 4 The diagram is included in Figure 3 A schematic cross-sectional view of the function of a capping layer in a display unit;

[0035] Figure 5 The diagram is included in Figure 1 A schematic cross-sectional view of an embodiment of a sensor unit in a display device of FIG. 1 ;

[0036] Figure 6 It is a graphic Figure 1 A schematic cross-sectional view of an embodiment of a display device;

[0037] Figure 7 The diagram is included in Figure 6 A schematic cross-sectional view of an embodiment of a capping layer in a display device;

[0038] Figure 8 The diagram is based on Figure 7 Schematic diagram of the luminous efficiency of the thickness of the capping layer;

[0039] Fig. 9 The diagram is based on Figure 7 Schematic diagram of reflectivity of the thickness of the capping layer;

[0040] Fig.10 The diagram is included in Figure 6 A schematic cross-sectional view of an embodiment of a capping layer in a display device;

[0041] Fig.11 and Fig.12 The diagram is based on Fig.10 Schematic diagram of the luminous efficiency of the thickness of the capping layer;

[0042] Fig.13 and Fig.14 The diagram is based on Fig.10 Schematic diagram of reflectivity of the thickness of the capping layer;

[0043] Fig.15 The diagram is included in Figure 6 A schematic cross-sectional view of an embodiment of a capping layer in a display device;

[0044] Fig.16 and Fig.17 The diagram is based on Fig.15 Schematic diagram of the luminous efficiency of the thickness of the capping layer;

[0045] Fig.18 and Fig.19 The diagram is based on Fig.15 Schematic diagram of reflectivity of the thickness of the capping layer;

[0046] Fig. 20 The diagram is included in Figure 6 A schematic cross-sectional view of an embodiment of a capping layer in a display device of ; and

[0047] Fig.21 The diagram is based on Fig. 20 Schematic diagram of the luminous efficiency and reflectivity of the thickness of the capping layer. DETAILED DESCRIPTION

[0048] In the following description, for the purpose of explanation, many specific details are set forth in order to provide a thorough understanding of various embodiments or implementations of the present invention. As used herein, "embodiment" and "implementation" are interchangeable words for non-limiting examples of the apparatus or method disclosed herein. However, it is apparent that various embodiments may be practiced without these specific details or with one or more equivalent settings. Here, various embodiments need not be exclusive, nor do they limit the present disclosure. For example, the specific shape, configuration, and characteristics of an embodiment may be used or implemented in another embodiment.

[0049] Unless otherwise specified, the illustrated embodiments will be understood to provide features of the present invention. Therefore, unless otherwise specified, the features, components, modules, layers, films, panels, regions and / or aspects of various embodiments (hereinafter referred to as "elements" respectively or collectively) may be combined, separated, interchanged and / or rearranged in other ways without departing from the present invention.

[0050] The use of cross hatching and / or shadows in the accompanying drawings is generally provided to make the boundaries between adjacent elements clear. Therefore, unless otherwise specified, the presence or absence of cross hatching or shadows does not convey or indicate any preference or demand for a specific material, material properties, size, ratio, commonality between the illustrated elements and / or any other characteristics, attributes, properties, etc. of the elements. In addition, in the accompanying drawings, for clarity and / or descriptive purposes, the size and relative size of the elements may be exaggerated. When the embodiment can be implemented in different ways, the specific process sequence can be performed differently from the described order. For example, two processes described in succession can be performed substantially simultaneously or in an order opposite to the described order. In addition, the same reference numerals refer to the same elements.

[0051] When an element (or layer) is referred to as being "on" another element or layer, "connected to" or "coupled to" another element or layer, the element or layer may be directly on, directly connected to or coupled to the other element or layer, or there may be an intervening element or layer. However, when an element or layer is referred to as being "directly on" another element or layer, "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers. For this reason, the term "connection" may refer to a physical connection, an electrical connection, and / or a fluid connection with or without an intervening element. In addition, the DR1 direction, the DR2 direction, and the DR3 direction are not limited to directions corresponding to the three axes of a rectangular coordinate system (such as, the X-axis, the Y-axis, and the Z-axis), but may be interpreted in a broader sense. For example, the DR1 direction, the DR2 direction, and the DR3 direction may be perpendicular to each other, or may represent different directions that are not perpendicular to each other. In addition, the X-axis, the Y-axis, and the Z-axis are not limited to the three axes of a rectangular coordinate system (such as, the x-axis, the y-axis, and the z-axis), but may be interpreted in a broader sense. For example, the X-axis, Y-axis, and Z-axis may be perpendicular to each other, or may represent different directions that are not perpendicular to each other. For the purposes of this disclosure, "at least one of A and B" may be interpreted as only A, only B, or any combination of A and B. In addition, "at least one of X, Y, and Z" and "at least one selected from the group consisting of X, Y, and Z" may be interpreted as only X, only Y, only Z, or any combination of two or more of X, Y, and Z. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0052] Although the terms "first", "second", etc. may be used herein to describe various types of elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another element. Therefore, the first element discussed below may be referred to as the second element without departing from the teachings of the present disclosure.

[0053] For descriptive purposes, spatially relative terms such as "below," "below," "under," "down," "above," "on," "above," "above," "side" (e.g., as in "sidewall") may be used herein and thereby describe the relationship of one element to another element(s) as shown in the figures. In addition to the orientation depicted in the figures, spatially relative terms are intended to cover different orientations of the device in use, operation, and / or manufacture. For example, if the device in the figure is flipped, an element described as being "below" or "below" other elements or features will then be oriented "above" the other elements or features. Thus, the term "below" can cover both above and below orientations. In addition, the device can be otherwise oriented (e.g., rotated 90 degrees or oriented in other orientations), and therefore, the spatially relative descriptors used herein are interpreted accordingly.

[0054] The terms used herein are for the purpose of describing specific embodiments, and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "the (described)" as used herein are also intended to include plural forms. In addition, when used in this specification, the terms "include" and / or "comprise" indicate that there are stated features, integral bodies, steps, operations, elements, parts and / or their groups, but do not exclude the presence or addition of one or more other features, integral bodies, steps, operations, elements, parts and / or their groups. It will also be noted that, as used herein, the terms "substantially", "approximately" and other similar terms are used as approximate terms rather than as terms of degree, and are therefore used to include the inherent deviations in the values ​​measured, calculated and / or provided that are recognized by those of ordinary skill in the art.

[0055] Various embodiments are described herein with reference to cross-sectional views and / or exploded views, which are schematic diagrams of embodiments and / or intermediate structures. Therefore, variations in the shapes of the illustrations due to, for example, manufacturing techniques and / or tolerances are expected. Therefore, the embodiments disclosed herein should not necessarily be interpreted as limited to the specific shapes of the areas shown, but rather include shape deviations caused by, for example, manufacturing. In this way, the areas shown in the drawings may be schematic in nature, and the shapes of these areas may not reflect the actual shapes of the areas of the device, and therefore, are not necessarily intended to be limiting.

[0056] As is customary in the art, some embodiments are described and illustrated in the accompanying drawings from the perspective of functional blocks, units and / or modules. It will be appreciated by those skilled in the art that these blocks, units and / or modules are physically implemented by electronic (or optical) circuits (e.g., logic circuits, discrete components, microprocessors, hard-wired circuits, memory elements, and wiring connections, etc.) that can be formed using semiconductor-based manufacturing techniques or other manufacturing techniques. In the case where blocks, units and / or modules are implemented by microprocessors or other similar hardware, they can be programmed and controlled using software (e.g., microcode) to perform the various functions discussed herein, and can be optionally driven by firmware and / or software. It should also be expected that each block, unit and / or module can be implemented by dedicated hardware, or implemented as a combination of dedicated hardware and processors (e.g., one or more programmed microprocessors and associated circuits) that perform certain functions to perform other functions. In addition, each block, unit and / or module in some embodiments can be physically divided into two or more interactive and discrete blocks, units and / or modules without departing from the scope of the present invention. Further, the blocks, units and / or modules of some embodiments may be physically combined into more complex blocks, units and / or modules without departing from the scope of the invention.

[0057] Hereinafter, a display device according to an embodiment is described with reference to the accompanying drawings related to the embodiment.

[0058] Figure 1 is a schematic diagram illustrating a display device according to an embodiment. Figure 2 It is a graphic Figure 1 Schematic cross-sectional view of an embodiment of a display device.

[0059] refer to Figure 1 and Figure 2 The display device DD may be a device that displays an image and may be used as a display screen for various products such as televisions, notebook computers, monitors, billboards, Internet of Things (IOT) devices, and portable electronic devices such as mobile phones, smart phones, tablet personal computers (PCs), smart watches, watch phones, mobile communication terminals, electronic notebooks, electronic books, portable multimedia players (PMPs), navigation devices, and ultra mobile PCs (UMPCs).

[0060] The display device DD may include a panel PNL and a driving circuit unit DV for driving the panel PNL. The display device DD may further include an external part OUP.

[0061] The panel PNL may include a display unit DP for displaying an image and a sensor unit TSP capable of sensing a user input (eg, a touch input). The display unit DP may be referred to as a display panel. The sensor unit TSP may be referred to as a sensing panel or a touch sensor.

[0062] The panel PNL may include a sub-pixel SPX and a sensing electrode SP. According to an embodiment, the sub-pixel SPX may display an image according to a display frame period. The sensing electrode SP may sense a user's input (e.g., a touch input) according to a sensing frame period. The sensing frame period and the display frame period may be independent of each other, or may be different from each other. The sensing frame period and the display frame period may be synchronous or asynchronous with each other.

[0063] The sensor unit TSP including the sensing electrode SP may obtain information about the user's touch input. According to an embodiment (e.g., a mutual capacitance method), the sensing electrode SP may include a first sensing electrode SP1 that provides a first sensing signal and a second sensing electrode SP2 that provides a second sensing signal. According to an embodiment, the first sensing electrode SP1 may be a transmitter (Tx) pattern electrode, and the second sensing electrode SP2 may be a receiver (Rx) pattern electrode. According to an embodiment, the information about the touch input (or touch event) may refer to information including the position of the touch requested by the user, etc.

[0064] However, the sensing electrode SP is not limited thereto. For example, according to an embodiment (eg, a self-capacitance method), the sensing electrode SP may be implemented as one type of sensing electrode without distinction between the first sensing electrode SP1 and the second sensing electrode SP2.

[0065] The display unit DP may include a display base layer DBSL (eg, a first base layer or a substrate) and a sub-pixel SPX provided on the display base layer DBSL. The sub-pixel SPX may be disposed in the display area DA. The sub-pixel SPX may form a pixel (eg, a single pixel) or a pixel unit.

[0066] The display base layer DBSL (or the display device DD) may include a display area DA in which an image is displayed and a non-display area NDA located outside the display area DA. According to an embodiment, the display area DA may be disposed in a central area of ​​the display unit DP, and the non-display area NDA may be disposed adjacent to the periphery of the display area DA.

[0067] The display base layer DBSL may be a base substrate or a base member for supporting the display device DD. The display base layer DBSL may be a rigid substrate of a glass material. In another example, the display base layer DBSL may be a flexible substrate that is bendable, foldable, or rollable. For example, the display base layer DBSL may include an insulating material such as a polymer resin (e.g., polyimide). However, the display base layer DBSL is not limited thereto.

[0068] The scan line SL and the data line DL and the sub-pixel SPX connected to the scan line SL and the data line DL may be arranged in the display area DA. The sub-pixel SPX may be selected by a scan signal having an on level supplied from the scan line SL, receive a data signal from the data line DL, and emit light having a brightness corresponding to the data signal. Accordingly, an image corresponding to the data signal may be displayed in the display area DA. However, the structure and driving method of the sub-pixel SPX are not limited.

[0069] Various lines connected to the subpixels SPX of the display area DA and / or built-in circuit units may be disposed in the non-display area NDA. For example, a plurality of lines for supplying various power and control signals to the display area DA may be disposed in the non-display area NDA.

[0070] The display unit DP may output visual information (e.g., an image). According to an embodiment, the type / kind of the display unit DP is not limited. For example, the display unit DP may be implemented as a self-emissive display panel such as an organic light-emitting display panel. However, in the case where the display unit DP is implemented as a self-emissive type, each pixel is not limited to the case where only an organic light-emitting element is included. For example, the light-emitting element of each pixel may be formed by an organic light-emitting diode, an inorganic light-emitting diode, or a quantum dot / quantum well light-emitting diode, etc.

[0071] Hereinafter, for convenience of description, the present disclosure is described based on an embodiment in which the display unit DP is implemented as an organic light emitting display panel.

[0072] The sensor unit TSP may include a sensor base layer SBSL and a plurality of sensing electrodes SP formed on the sensor base layer SBSL. The sensing electrodes SP may be disposed in a sensing area SA on the sensor base layer SBSL.

[0073] The sensor base layer SBSL (or the display device DD) may include a sensing area SA for sensing a touch input or the like and a non-sensing area NSA located around the sensing area SA. According to an embodiment, the sensing area SA may overlap with at least one area of ​​the display area DA. For example, the sensing area SA may be referred to as an area corresponding to the display area DA (e.g., an area overlapping the display area DA), and the non-sensing area NSA may be referred to as an area corresponding to the non-display area NDA (e.g., an area overlapping the non-display area NDA). For example, in the case where a touch input or the like is provided on the display area DA, the touch input may be detected by the sensor unit TSP.

[0074] The sensor base layer SBSL may include one or more insulating layers (eg, Figure 5 For example, the first insulating layer INS1 for forming the sensor base layer SBSL may be disposed on the display unit DP to form a base for forming the sensing electrode SP. However, examples for forming the sensor base layer SBSL are not limited.

[0075] The sensing area SA may be referred to as an area capable of responding to a touch input (eg, an active area of ​​a sensor). For example, a sensing electrode SP for sensing a touch input, etc. may be disposed in the sensing area SA.

[0076] The sensor unit TSP may obtain information about an input provided from a user. The sensor unit TSP may recognize or sense a touch input. The sensor unit TSP may recognize or sense a touch input using a capacitive sensing method. The sensor unit TSP may sense a touch input by using a mutual capacitance method, or may sense a touch input by using a self capacitance method.

[0077] According to an embodiment, each of the first sensing electrodes SP1 may extend in the first direction DR1. The first sensing electrodes SP1 may be arranged in the second direction DR2. The second direction DR2 may be different from the first direction DR1. For example, the second direction DR2 may be a direction perpendicular to the first direction DR1. Each of the first sensing electrodes SP1 may have a form in which a first unit having a relatively large area and a first bridge electrode having a relatively small area are connected to each other. The first sensing electrode SP1 may substantially have a diamond shape. However, the shape of the first sensing electrode SP1 is not limited.

[0078] According to an embodiment, each of the second sensing electrodes SP2 may extend in the second direction DR2. The second sensing electrodes SP2 may be arranged in the first direction DR1. Each of the second sensing electrodes SP2 may have a form in which a second unit having a relatively large area and a second bridge electrode having a relatively small area are connected to each other. The second sensing electrode SP2 may substantially have a diamond shape. However, the shape of the second sensing electrode SP2 is not limited.

[0079] According to an embodiment, the first sensing electrode SP1 and the second sensing electrode SP2 may have substantially the same shape. For example, the first sensing electrode SP1 which is a transmitter (Tx) pattern electrode and the second sensing electrode SP2 which is a receiver (Rx) pattern electrode may have substantially the same shape, and thus the sensing performance of the touch event may be uniformly performed within the sensing area SA.

[0080] For example, a sensing line for electrically connecting the sensing electrode SP to the sensor driver SDV or the like may be disposed in the non-sensing area NSA of the sensor unit TSP.

[0081] The driving circuit unit DV may include a display driver DDV for driving the display unit DP and a sensor driver SDV for driving the sensor unit TSP.

[0082] The display driver DDV may be electrically connected to the display unit DP to drive the sub-pixel SPX. The sensor driver SDV may be electrically connected to the sensor unit TSP to drive the sensor unit TSP.

[0083] The outer portion OUP may be substantially disposed above the display device DD based on the thickness direction (eg, the third direction DR3) of the display base layer DBSL. The outer portion OUP may be disposed on the sensor unit TSP. Light provided from the display unit DP may pass through the outer portion OUP and may be output to the outside.

[0084] The outer portion OUP may include a light shielding layer BM (refer to Figure 6 ) to improve the visibility of the display device DD. For example, the light shielding layer BM may overlap the first sensing electrode SP1 and the second sensing electrode SP2 forming the sensor unit TSP to reduce the risk that the first sensing electrode SP1 and the second sensing electrode SP2 impair visibility.

[0085] The outer portion OUP may further include a reflection control layer RCL (refer to Figure 6 Since the reflection control layer RCL according to the embodiment is provided, the display quality of the display device DD can be improved, and the reliability of the technical effect of the display quality improvement can be improved. The details about this point will be described later.

[0086] According to an embodiment, the outer portion OUP may protect the internal structure of the display device DD from external influences. For example, the outer portion OUP may further include a protective film PF capable of transmitting light (refer to Figure 6 ).

[0087] Figure 3 The diagram is included in Figure 1 Schematic cross-sectional view of an embodiment of a display unit in a display device. Figure 4 The diagram is included in Figure 3 Schematic cross-sectional view of the function of the capping layer in a display unit.

[0088] refer to Figure 3 , the display unit DP may include a pixel circuit layer PCL and a light emitting element layer EML.

[0089] The pixel circuit layer PCL may include a pixel circuit for driving the light emitting element LD. The pixel circuit layer PCL may include a display base layer DBSL, a conductive layer for forming the pixel circuit, and an insulating layer disposed between the conductive layers.

[0090] The pixel circuit may include a driving transistor. The pixel circuit may include a thin film transistor. The pixel circuit may be electrically connected to the light emitting element LD to provide an electrical signal for the light emitting element LD to emit light.

[0091] The light emitting element layer EML may be disposed on the pixel circuit layer PCL. According to an embodiment, the light emitting element layer EML may include a light emitting element LD, a pixel defining layer PDL, a capping layer CAP, an anti-reflection layer LRL, and an encapsulation layer TFE.

[0092] The light emitting element LD may be disposed on the pixel circuit layer PCL. According to an embodiment, the light emitting element LD may include a first electrode ELT1, a light emitting layer EL disposed on the first electrode ELT1, and a second electrode ELT2 disposed on the light emitting layer EL. According to an embodiment, the light emitting layer EL may be disposed in a region defined by a pixel defining layer PDL. The pixel defining layer PDL may be adjacent to the periphery of the light emitting layer EL. One surface of the light emitting layer EL may be electrically connected to the first electrode ELT1, and the other surface of the light emitting layer EL may be electrically connected to the second electrode ELT2.

[0093] The first electrode ELT1 may be an anode electrode of the light emitting element LD, and the second electrode ELT2 may be a common electrode (or cathode electrode) of the light emitting element LD. According to an embodiment, the first electrode ELT1 and the second electrode ELT2 may include a conductive material. For example, the first electrode ELT1 may include a conductive material having a reflective property, and the second electrode ELT2 may include a transparent conductive material. However, the first electrode ELT1 and the second electrode ELT2 are not limited thereto.

[0094] The light emitting layer EL may have a thin film multilayer structure including a light generating layer. The light emitting layer EL may include a hole injection layer for injecting holes, a hole transport layer having excellent hole transport properties and for increasing the chance of recombination of holes and electrons by suppressing the movement of unbound electrons in the light generating layer, a light generating layer for emitting light by recombination of injected electrons and holes, a hole blocking layer for suppressing the movement of unbound holes in the light generating layer, an electron transport layer for smoothly transporting electrons to the light generating layer, and an electron injection layer for injecting electrons. The light emitting layer EL may emit light based on an electrical signal provided from the first electrode ELT1 and the second electrode ELT2.

[0095] According to an embodiment, the light emitting layer EL may emit light of a wavelength band. For example, the light emitting layer EL may include a first light emitting layer EL1 (refer to Figure 6 ), a second light emitting layer EL2 (reference Figure 6 ) and a third light emitting layer EL3 (reference Figure 6 ).

[0096] The first light emitting layer EL1 may form a first light emitting element emitting light of a first color, the second light emitting layer EL2 may form a second light emitting element emitting light of a second color, and the third light emitting layer EL3 may form a third light emitting element emitting light of a third color.

[0097] The first color may be red. For example, the first waveband corresponding to the first color may be a waveband of about 600 nm to about 750 nm. The second color may be green. For example, the second waveband corresponding to the second color may be in the range of about 480 nm to about 560 nm. The third color may be blue. For example, the third waveband corresponding to the third color may be a waveband of about 370 nm to about 460 nm.

[0098] According to an embodiment, the light emitting layer EL may not substantially emit light of a non-emission wavelength band. In the specification, the non-emission wavelength band may be a wavelength band including a wavelength that at least partially does not overlap with a wavelength band of light emitted from the light emitting layer EL.

[0099] According to an embodiment, the non-emission band may not overlap with the band of light emitted from the light emitting layer EL. For example, the non-emission band may not overlap with the first band. The non-emission band may not overlap with the second band. The non-emission band may not overlap with the third band.

[0100] According to an embodiment, the non-emission band may include a first non-emission band and a second non-emission band. The second non-emission band may be a band larger than the first non-emission band.

[0101] For example, the first non-emission band may include a band between the third band and the second band. The first non-emission band may include a band between the peak wavelength of the third band and the peak wavelength of the second band. The second non-emission band may include a band between the second band and the first band. The second non-emission band may include a band between the peak wavelength of the second band and the peak wavelength of the first band.

[0102] According to an embodiment, the first non-emission band may be in the range of about 460nm to about 520nm. In another example, the first non-emission band may be in the range of about 490nm to about 505nm. According to an embodiment, the second non-emission band may be in the range of about 560nm to about 620nm. In another example, the second non-emission band may be in the range of about 585nm to about 600nm. However, the embodiment is not limited thereto.

[0103] According to an embodiment, a reflection control layer RCL (refer to Figure 6 ), and thus the reflectivity and color sense of the display device DD can be improved. Details on this point will be described later.

[0104] The pixel defining layer PDL may be disposed on the pixel circuit layer PCL to define the position at which the light emitting layer EL is disposed. The pixel defining layer PDL may include an organic material. The organic material may include one or more of the group consisting of acrylic resin, epoxy resin, phenolic resin, polyamide resin, and polyimide resin. However, the pixel defining layer PDL is not limited thereto. For example, the pixel defining layer PDL may include an inorganic material.

[0105] The capping layer CAP may be disposed on the light emitting element LD (e.g., the second electrode ELT2). The capping layer CAP may be disposed between the anti-reflection layer LRL and the light emitting element LD (e.g., the second electrode ELT2). The capping layer CAP may protect the light emitting element LD (e.g., the second electrode ELT2) from external influences (e.g., from external impacts). The capping layer CAP may be an insulating layer including an inorganic material. The inorganic material may include silicon nitride (SiN x ), silicon oxide (SiO x ), silicon oxynitride (SiO x N y ) and such as aluminum oxide (AlO x ) at least one of metal oxides. However, the inorganic material is not limited thereto. According to an embodiment, the capping layer CAP may include lithium fluoride (LiF).

[0106] In an embodiment, the capping layer CAP may make external light incident on the display device DD disappear. For example, the capping layer CAP may offset (or eliminate) the external light by using a phase difference of the external light reflected from the capping layer CAP. Figure 4 , for example, a portion L1 of the external light may be reflected from the upper surface of the capping layer CAP, and another portion L2 of the external light may be reflected from the lower surface of the capping layer CAP. For example, the external light may be divided into a first reflected light R1 reflected from the upper surface of the capping layer CAP and a second reflected light R2 reflected from the lower surface of the capping layer CAP. The phase of the first reflected light R1 and the phase of the second reflected light R2 may be opposite to each other. Accordingly, since the first reflected light R1 and the second reflected light R2 cancel each other out and disappear, the reflected external light may not be recognized or sensed from the outside. Accordingly, the display quality of the display device DD may be improved. For example, since the external light is not reflected, the display device DD may effectively display a black image.

[0107] The capping layer CAP may include a single-layer or multi-layer insulating layer.

[0108] An anti-reflection layer LRL (eg, a low-reflection inorganic layer or a destructive interference layer) may be disposed on the capping layer CAP. The anti-reflection layer LRL may be disposed between the capping layer CAP and the encapsulation layer TFE.

[0109] The anti-reflection layer LRL may include an inorganic material. For example, the anti-reflection layer LRL may include one or more of a metal and a metal compound. For example, the metal may include one or more of aluminum (Al), silver (Ag), magnesium (Mg), chromium (Cr), titanium (Ti), nickel (Ni), gold (Au), tantalum (Ta), copper (Cu), calcium (Ca), cobalt (Co), iron (Fe), molybdenum (Mo), tungsten (W), platinum (Pt), bismuth (Bi), and ytterbium (Yb). The metal compound may include silicon oxide (SiO x ), titanium oxide (TiO x ), zirconium oxide (ZrO x ), Tantalum Oxide (Ta x O y ), hafnium oxide (HfO x ), aluminum oxide (Al x O y ), zinc oxide (ZnO x ), yttrium oxide (Y x O y ), beryllium oxide (BeO x ), magnesium oxide (MgO x ), lead oxide (PbO x ), tungsten oxide (WO x ), bismuth oxide (BiO x ), silicon nitride (SiN x ), lithium fluoride (LiF x ), calcium fluoride (CaF x ), magnesium fluoride (MgF x ) and cadmium sulfide (CdS x ). One or more of the above materials may be selected as the anti-reflection layer LRL in consideration of the refractive index and the absorption coefficient. For example, the anti-reflection layer LRL may include ytterbium (Yb) or bismuth (Bi).

[0110] The anti-reflection layer LRL may reflect the applied light. For example, the light reflected by the anti-reflection layer LRL and the light reflected by the capping layer CAP (or the second electrode ELT2) may destructively interfere with each other. Accordingly, the external light reflectivity of the display device DD may be reduced, and the display quality and visibility of the display device DD may be improved.

[0111] The encapsulation layer TFE (or thin film encapsulation layer) may be disposed on the anti-reflection layer LRL. The encapsulation layer TFE may offset (or compensate for) the step difference generated by the light emitting element LD, the capping layer CAP, the anti-reflection layer LRL, and the pixel defining layer PDL. The encapsulation layer TFE may include a plurality of insulating layers covering the light emitting element LD. According to an embodiment, the encapsulation layer TFE may have a structure in which inorganic layers and organic layers are alternately stacked. According to an embodiment, the encapsulation layer TFE may be an encapsulation layer having a structure in which a first inorganic layer, an organic layer, and a second inorganic layer are sequentially stacked. According to an embodiment, the encapsulation layer TFE may be a thin film encapsulation layer.

[0112] Figure 5 The diagram is included in Figure 1 Schematic cross-sectional view of an embodiment of a sensor unit in a display device.

[0113] refer to Figure 5 , the sensor unit TSP may be disposed on the light emitting element layer EML (or the encapsulation layer TFE). According to an embodiment, the sensor unit TSP may be disposed (e.g., directly disposed) on the encapsulation layer TFE. The sensor unit TSP may include a first insulating layer INS1, a first conductive pattern layer CP1, a second insulating layer INS2, a second conductive pattern layer CP2, and a protective layer PVX.

[0114] According to an embodiment, the first conductive pattern layer CP1 and the second conductive pattern layer CP2 may be patterned at a position to form a sensing electrode SP (refer to Figure 1 ). For example, a portion of each of the first conductive pattern layer CP1 and the second conductive pattern layer CP2 may form the first sensing electrode SP1, and a portion of the second conductive pattern layer CP2 may form the second sensing electrode SP2. However, the embodiment is not limited thereto.

[0115] The first insulating layer INS1 may be disposed on the encapsulation layer TFE. The first insulating layer INS1 may form the sensor base layer SBSL and may provide a region where the first conductive pattern layer CP1, the second insulating layer INS2, the second conductive pattern layer CP2, and the protective layer PVX are disposed. The first insulating layer INS1 may include an inorganic material.

[0116] The first conductive pattern layer CP1 may be disposed on the first insulating layer INS1. The second conductive pattern layer CP2 may be disposed on the second insulating layer INS2. The first conductive pattern layer CP1 and the second conductive pattern layer CP2 may be spaced apart from each other with the second insulating layer INS2 interposed therebetween.

[0117] The first conductive pattern layer CP1 and the second conductive pattern layer CP2 may include a single layer or multiple layers of metal layers. The first conductive pattern layer CP1 and the second conductive pattern layer CP2 may include at least one of various metal materials including gold (Au), silver (Ag), aluminum (Al), molybdenum (Mo), chromium (Cr), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu) and platinum (Pt) or an alloy thereof. According to an embodiment, the first conductive pattern layer CP1 and the second conductive pattern layer CP2 may include silver nanowires (AgNW), indium tin oxide (ITO), indium zinc oxide (IZO), indium gallium zinc oxide (IGZO), aluminum zinc oxide (AZO), indium tin zinc oxide (ITZO), zinc oxide (ZnO), tin oxide (SnO 2 ), at least one of various transparent conductive materials of carbon nanotubes and graphene.

[0118] The second insulating layer INS2 may be disposed on the first conductive pattern layer CP1. The second insulating layer INS2 may be interposed between the first conductive pattern layer CP1 and the second conductive pattern layer CP2. The protective layer PVX may be disposed on the second conductive pattern layer CP2.

[0119] The second insulating layer INS2 may include an organic material. The protective layer PVX may include an organic material. The organic material may include one or more of the group consisting of acrylic resin, methacrylic resin, polyisoprene, vinyl resin, epoxy resin, urethane resin, cellulose resin, siloxane resin, polyimide resin, polyamide resin and perylene resin. However, the embodiment is not limited thereto. The second insulating layer INS2 and / or the protective layer PVX may include an inorganic material.

[0120] Figure 6 It is a graphic Figure 1 Schematic cross-sectional view of an embodiment of a display device.

[0121] refer to Figure 6 , the display device DD may include a first light emitting layer EL1, a second light emitting layer EL2, and a third light emitting layer EL3 that emit light of different colors.

[0122] For example, the display device DD may include sub-pixels SPX that each form a sub-pixel region SPXA. The sub-pixel region SPXA may include: a first sub-pixel region SPXA1 that is an area formed by the first sub-pixel SPX1 and emits light of a first color; a second sub-pixel region SPXA2 that is an area formed by the second sub-pixel SPX2 and emits light of a second color; and a third sub-pixel region SPXA3 that is an area formed by the third sub-pixel SPX3 and emits light of a third color.

[0123] According to an embodiment, light of a first color of a first wavelength band may be emitted from the first sub-pixel region SPXA1, light of a second color of a second wavelength band may be emitted from the second sub-pixel region SPXA2, and light of a third color of a third wavelength band may be emitted from the third sub-pixel region SPXA3.

[0124] The second electrode ELT2, the capping layer CAP, the anti-reflection layer LRL and the encapsulation layer TFE may be sequentially disposed on the first light emitting layer EL1, the second light emitting layer EL2 and the third light emitting layer EL3. Each of the second electrode ELT2, the capping layer CAP, the anti-reflection layer LRL and the encapsulation layer TFE may be disposed throughout the sub-pixel SPX.

[0125] The sensor unit TSP may be disposed on the encapsulation layer TFE. According to an embodiment, the first conductive pattern layer CP1 and the second conductive pattern layer CP2 included in the sensor unit TSP may form a sensing electrode SP.

[0126] According to an embodiment, the contact portion CNT may be formed in the second insulating layer INS2 included in the sensor unit TSP. The contact portion CNT may pass through the second insulating layer INS2. According to an embodiment, at least a portion of the second conductive pattern layer CP2 may be electrically connected to the first conductive pattern layer CP1 through the contact portion CNT.

[0127] The outer portion OUP may be disposed on the sensor unit TSP, and may include a light shielding layer BM, a reflection control layer RCL, and a protection film PF.

[0128] The light shielding layer BM may be disposed on the protective layer PVX. The light shielding layer BM may contact the protective layer PVX. The light shielding layer BM may contact the reflection control layer RCL. The light shielding layer BM may be disposed between the reflection control layer RCL and the sensor unit TSP.

[0129] The light shielding layer BM may be disposed between adjacent sub-pixel regions SPXA. For example, the light shielding layer BM may be disposed between the first sub-pixel region SPXA1 and the second sub-pixel region SPXA2, may be disposed between the second sub-pixel region SPXA2 and the third sub-pixel region SPXA3, and may be disposed between the first sub-pixel region SPXA1 and the third sub-pixel region SPXA3. According to an embodiment, in a plan view, an opening included in the light shielding layer BM may overlap with the sub-pixel region SPXA.

[0130] The light shielding layer BM may include a light absorbing material. The light absorbing material may include a colorant including at least one of carbon black and lactam black. However, the embodiment is not limited thereto, and the light absorbing material may be implemented with various materials. According to an embodiment, the light shielding layer BM may include a light shielding structure formed by stacking two or more color filters.

[0131] In a plan view, the light shielding layer BM may overlap the first conductive pattern layer CP1 and the second conductive pattern layer CP2. Accordingly, the light shielding layer BM may reduce the risk that the first conductive pattern layer CP1 and the second conductive pattern layer CP2 impair visibility.

[0132] Based on the display direction (eg, the third direction DR3) of the display device DD, the reflection control layer RCL may be disposed outside the display unit DP. For example, the reflection control layer RCL may be disposed on the sensor unit TSP (eg, the protection layer PVX).

[0133] The reflection control layer RCL may include a first surface SF1 and a second surface SF2. The first surface SF1 may be a lower surface of the reflection control layer RCL and may face the display unit DP. The second surface SF2 may be a surface opposite to the first surface SF1. The second surface SF2 may face the outside and may face the protective film PF.

[0134] The reflection control layer RCL may contact the light shielding layer BM. The reflection control layer RCL may contact the protection film PF. The reflection control layer RCL may contact an upper surface (eg, the protection layer PVX) of the sensor unit TSP.

[0135] The reflection control layer RCL may be disposed throughout the sub-pixel SPX. The reflection control layer RCL may be disposed throughout the sub-pixel region SPXA. For example, the reflection control layer RCL may be included in each of the first sub-pixel SPX1, the second sub-pixel SPX2, and the third sub-pixel SPX3. The reflection control layer RCL may be disposed throughout the first sub-pixel region SPXA1, the second sub-pixel region SPXA2, and the third sub-pixel region SPXA3. For example, the reflection control layer RCL disposed in each of the first sub-pixel region SPXA1, the second sub-pixel region SPXA2, and the third sub-pixel region SPXA3 may be integrated with each other.

[0136] According to an embodiment, light emitted from the light emitting layer EL may pass through the reflection control layer RCL and may be emitted to the outside. According to an embodiment, light emitted from the light emitting layer EL may pass through the capping layer CAP, the anti-reflection layer LRL, and the reflection control layer RCL and may be output.

[0137] For example, light emitted from the first light-emitting layer EL1 may pass through the reflection control layer RCL (or the capping layer CAP, the anti-reflection layer LRL, and the reflection control layer RCL), and may be emitted to the outside of the display device DD. Accordingly, a first sub-pixel region SPXA1 may be formed or defined. Light emitted from the second light-emitting layer EL2 may pass through the reflection control layer RCL (or the capping layer CAP, the anti-reflection layer LRL, and the reflection control layer RCL), and may be emitted to the outside of the display device DD. Accordingly, a second sub-pixel region SPXA2 may be formed or defined. Light emitted from the third light-emitting layer EL3 may pass through the reflection control layer RCL (or the capping layer CAP, the anti-reflection layer LRL, and the reflection control layer RCL), and may be emitted to the outside of the display device DD. Accordingly, a third sub-pixel region SPXA3 may be formed or defined.

[0138] The reflection control layer RCL can selectively absorb light of a wavelength band. Accordingly, the reflection control layer RCL can control the reflectivity of the display device DD, and thus can improve the display quality of the display device DD.

[0139] The reflection control layer RCL may absorb at least a portion of light in a non-emission band of the light emitting layer EL.

[0140] For example, the reflection control layer RCL may absorb at least a portion of each of the first light of the first non-emission wavelength band and the second light of the second non-emission wavelength band.

[0141] According to an embodiment, the reflection control layer RCL may absorb at least a portion of light having a wavelength of about 460 nm to about 520 nm, and may absorb at least a portion of light having a wavelength of about 560 nm to about 620 nm. In another example, the reflection control layer RCL may absorb at least a portion of light having a wavelength of about 490 nm to about 505 nm, and may absorb at least a portion of light having a wavelength of about 585 nm to about 600 nm.

[0142] Accordingly, the reflection control layer RCL may absorb at least a portion of light in the non-emission band of the light emitting layer EL, and display quality may be improved.

[0143] The reflection control layer RCL may include various materials. According to an embodiment, the reflection control layer RCL may include a dye, a pigment, or a combination thereof. For example, the reflection control layer RCL may include various organic materials, and the reflection control layer RCL may include one or more of the group consisting of oxazine compounds, cyanine compounds, porphyrazine compounds, and squarylium compounds. However, the embodiment is not limited thereto.

[0144] The protection film PF may be disposed on the reflection control layer RCL. The protection film PF may contact the reflection control layer RCL. The protection film PF may be relatively disposed outside the display device DD to protect the internal structure of the display device DD.

[0145] According to an embodiment, the protection film PF may include one of a polyethylene terephthalate (PET) film, a low reflection film, a polarization film, and a transmittance controllable film, However, the embodiment is not limited thereto.

[0146] The structure of the outer part OUP according to the embodiment is not limited to the above example. For example, the outer part OUP may further include a window capable of transmitting light.

[0147] Figure 7 The diagram is included in Figure 6 Schematic cross-sectional view of an embodiment of a capping layer in a display device of FIG. Figure 7 The light emitting element LD, the anti-reflection layer LRL and the encapsulation layer TFE adjacent to the capping layer CAP are further shown. Figure 8 The diagram is based on Figure 7 Schematic diagram of the luminous efficiency of the capping layer thickness. Fig. 9 The diagram is based on Figure 7 Schematic diagram of the reflectivity of the capping layer thickness.

[0148] refer to Figure 7 , the capping layer CAP may include a first capping layer CAP1 and a second capping layer CAP2.

[0149] The first capping layer CAP1 may be disposed (e.g., directly disposed) on the light emitting element LD (or the second electrode ELT2), and the second capping layer CAP2 may be disposed on the first capping layer CAP1. The first capping layer CAP1 and the second capping layer CAP2 may include an inorganic material. The capping layer CAP may eliminate external light by using a phase difference of external light reflected from each of the first capping layer CAP1 and the second capping layer CAP2.

[0150] In an embodiment, the refractive index n2 of the second capping layer CAP2 may be greater than the refractive index n1 of the first capping layer CAP1. For example, the refractive index n2 of the second capping layer CAP2 may be greater than the refractive index n1 of the first capping layer CAP1 by about 0.1 or more. For example, the refractive index n1 of the first capping layer CAP1 may be in the range of about 1.2 to about 1.7, and the refractive index n2 of the second capping layer CAP2 may be in the range of about 1.7 to about 2.2. For example, the first capping layer CAP1 may be referred to as a low refractive index capping layer, and the second capping layer CAP2 may be referred to as a high refractive index capping layer.

[0151] In an embodiment, the thickness TH1 of the first capping layer CAP1 may be about To about and the thickness TH2 of the second capping layer CAP2 may be in the range of about To about For example, while the luminous efficiency (or efficiency) is improved by the capping layer CAP, the reflectivity (or reflectance) of external light can be reduced.

[0152] refer to Figure 7 and Figure 8 , Figure 8 The light emitting efficiency (or efficiency) according to the thickness TH1 of the first capping layer CAP1 for each thickness TH2 of the second capping layer CAP2 is shown. Figure 8 The luminous efficiency (or efficiency) shown in (and the luminous efficiency described below) may be a display device DD (refer to Figure 6 ) to the light emission amount of the display device not including the capping layer CAP. As the light emission efficiency is improved, the display quality can be improved.

[0153] like Figure 8 As shown in FIG. 1 , the thickness TH2 of the second capping layer CAP2 is approximately or approximately In the case of , the luminous efficiency may be about 100% or more. When the thickness TH2 of the second capping layer CAP2 is about And the thickness TH1 of the first capping layer CAP1 is about or less, the luminous efficiency can be in the range of about 98% or more. Figure 8 2 shows the luminous efficiency according to the thickness TH1 of the first capping layer CAP1 and the thickness TH2 of the second capping layer CAP2, and thus a detailed description of the luminous efficiency of each thickness is omitted for convenience of description.

[0154] refer to Figure 7 and Fig. 9 ,exist Fig. 9 Graph 2 shows the reflectivity according to the thickness TH1 of the first capping layer CAP1 for each thickness TH2 of the second capping layer CAP2. Fig. 9 The reflectivity shown in (and the reflectivity described below) may be a reflection of the display device DD (refer to Figure 6 ) to the external light reflectivity of the display device not including the capping layer CAP. As the reflectivity decreases, the display quality can be improved.

[0155] like Fig. 9 As shown in FIG. 1 , the thickness TH2 of the second capping layer CAP2 is approximately And the thickness TH1 of the first capping layer CAP1 is about In the case of , the reflectivity can be in the range of about 1 or less. When the thickness TH2 of the second capping layer CAP2 is about In the case of , the reflectivity can be in the range of about 1 or less. When the thickness TH2 of the second capping layer CAP2 is about And the thickness TH1 of the first capping layer CAP1 is about In the case where the reflectivity is within the range of about 1 or less, the reflectivity can be within the range of about 1 or less. Fig. 9 2 shows the reflectivity according to the thickness TH1 of the first capping layer CAP1 and the thickness TH2 of the second capping layer CAP2, and thus a detailed description of the reflectivity of each thickness is omitted for convenience of description.

[0156] In an embodiment, the total thickness of the capping layer CAP including the first capping layer CAP1 and the second capping layer CAP2 may be about 1.5 mm. To about For example, the thickness TH1 of the first capping layer CAP1 may be about To about and the thickness TH2 of the second capping layer CAP2 may be in the range of about To about For example, the reflectivity can be reduced while maintaining a luminous efficiency of about 98% or more.

[0157] [Table 1]

[0158]

[0159] Table 1 shows the Figures 7 to 9 Thicknesses TH1 and TH2 of the first capping layer CAP1 and the second capping layer CAP2 of the embodiment and reflectivity and luminous efficiency according to the thicknesses TH1 and TH2. The numerical value written together with the reflectivity (or the numerical value written in parentheses) may indicate the ratio (or absolute value) of reflecting external light, and the numerical value written together with the luminous efficiency may indicate the difference with using a polarizing film instead of Figure 6 Compared with the external part of the OUP (or reflection control layer RCL) of the display device, Figure 6 For reference, a ratio and an efficiency ratio of a display device DD that does not include a capping layer CAP and reflects external light may be approximately 7.90 and approximately 78.9%, respectively.

[0160] In the first case CASE1, the thickness TH1 of the first capping layer CAP1 is approximately And the thickness TH2 of the second capping layer CAP2 is about In this case, the reflectivity is about 0.918 and the luminous efficiency is about 99.61%.

[0161] In the second case CASE2, the thickness TH1 of the first capping layer CAP1 is about And the thickness TH2 of the second capping layer CAP2 is about In this case, the reflectivity is about 0.927 and the luminous efficiency is about 99.74%.

[0162] In the third case CASE3, the thickness TH1 of the first capping layer CAP1 is about And the thickness TH2 of the second capping layer CAP2 is about In this case, the reflectivity is about 0.931 and the luminous efficiency is about 100.25%.

[0163] As described above, the capping layer CAP may include a first capping layer CAP1 and a second capping layer CAP2, the refractive index n2 of the second capping layer CAP2 may be greater than the refractive index n1 of the first capping layer CAP1, and the thickness TH1 of the first capping layer CAP1 may be about 1000 mm. To about and the thickness TH2 of the second capping layer CAP2 may be in the range of about To about For example, while maintaining the display device DD (reference Figure 6 ) can improve the luminous efficiency, the reflectivity of external light can be reduced, and the display quality of the display device DD can be improved.

[0164] Fig.10 The diagram is included in Figure 6 Schematic cross-sectional view of an embodiment of a capping layer in a display device of FIG. Fig.10 The light emitting element LD, the anti-reflection layer LRL and the encapsulation layer TFE adjacent to the capping layer CAP are further shown. Fig.11 and Fig.12 The diagram is based on Fig.10 Schematic diagram of the luminous efficiency of the capping layer thickness. Fig.13 and Fig.14 The diagram is based on Fig.10 Schematic diagram of the reflectivity of the capping layer thickness.

[0165] refer to Figure 7 and Fig.10, the capping layer CAP may further include a third capping layer CAP3. For example, the capping layer CAP may include a first capping layer CAP1, a second capping layer CAP2, and a third capping layer CAP3. The capping layer CAP may offset (or eliminate) external light by using a phase difference of external light reflected from each of the first capping layer CAP1, the second capping layer CAP2, and the third capping layer CAP3.

[0166] The third capping layer CAP3 may be disposed on the second capping layer CAP2. The third capping layer CAP3 may be disposed between the second capping layer CAP2 and the anti-reflection layer LRL. The third capping layer CAP3 may include an inorganic material.

[0167] In an embodiment, the refractive index n2 of the second capping layer CAP2 may be greater than each of the refractive index n1 of the first capping layer CAP1 and the refractive index n3 of the third capping layer CAP3. For example, the refractive index n2 of the second capping layer CAP2 may be greater than each of the refractive index n1 of the first capping layer CAP1 and the refractive index n3 of the third capping layer CAP3 by about 0.1 or more. For example, each of the refractive index n1 of the first capping layer CAP1 and the refractive index n3 of the third capping layer CAP3 may be in the range of about 1.2 to about 1.7, and the refractive index n2 of the second capping layer CAP2 may be in the range of about 1.7 to about 2.2. For example, the first capping layer CAP1 may be referred to as a first low refractive index capping layer, the second capping layer CAP2 may be referred to as a high refractive index capping layer, and the third capping layer CAP3 may be referred to as a second low refractive index capping layer.

[0168] In an embodiment, the thickness TH1 of the first capping layer CAP1 may be about To about In the range of about To about and the thickness TH3 of the third capping layer CAP3 may be in the range of about To about For example, while maintaining or improving the luminous efficiency (or efficiency) by the capping layer CAP, the reflectivity (or reflectance) of external light can be reduced.

[0169] refer to Fig.11 , showing that the thickness TH3 of the third capping layer CAP3 is approximately For each thickness TH2 of the second capping layer CAP2, the luminous efficiency (or efficiency) according to the thickness TH1 of the first capping layer CAP1 is shown in FIG.

[0170] like Fig.11 As shown in FIG. , the thickness TH3 of the third capping layer CAP3 is approximately In the case where the thickness TH2 of the second capping layer CAP2 is less than about The thickness TH1 of the first capping layer CAP1 is less than about In the case of , the luminous efficiency can be in the range of about 100% or more. When the thickness TH3 of the third capping layer CAP3 is about In the case of, and the thickness TH2 of the second capping layer CAP2 is about The thickness TH1 of the first capping layer CAP1 is less than about In the case of , the luminous efficiency can be in the range of about 98% or more. Fig.11 It is shown that the thickness TH3 of the third capping layer CAP3 is approximately , and thus, for convenience of description, a detailed description of the luminous efficiency of each thickness is omitted.

[0171] refer to Fig.12 , showing that the thickness TH3 of the third capping layer CAP3 is approximately For each thickness TH2 of the second capping layer CAP2, the luminous efficiency (or efficiency) according to the thickness TH1 of the first capping layer CAP1 is shown in FIG.

[0172] like Fig.12 As shown in FIG. , the thickness TH3 of the third capping layer CAP3 is approximately In the case of, and the thickness TH2 of the second capping layer CAP2 is about In the case of , the luminous efficiency can be in the range of about 100% or more. When the thickness TH3 of the third capping layer CAP3 is about In the case of, and the thickness TH2 of the second capping layer CAP2 is about The thickness TH1 of the first capping layer CAP1 is less than about In the case of , the luminous efficiency can be in the range of about 100% or more. Fig.12 It is shown that the thickness TH3 of the third capping layer CAP3 is approximately , and thus, for convenience of description, a detailed description of the luminous efficiency of each thickness is omitted.

[0173] refer to Fig.13 , showing that the thickness TH3 of the third capping layer CAP3 is approximately For each thickness TH2 of the second capping layer CAP2, the reflectivity according to the thickness TH1 of the first capping layer CAP1 is calculated.

[0174] like Fig.13 As shown in FIG. , the thickness TH3 of the third capping layer CAP3 is approximately In the case of, and the thickness TH2 of the second capping layer CAP2 is about or less and the thickness TH1 of the first capping layer CAP1 is about In the case where the thickness TH3 of the third capping layer CAP3 is about 1, the reflectivity may be in the range of about 1 or less. In the case of, and the thickness TH2 of the second capping layer CAP2 is about In the case of , the reflectivity can be in the range of about 1 or less. When the thickness TH3 of the third capping layer CAP3 is about In the case of, and the thickness TH2 of the second capping layer CAP2 is about The thickness TH1 of the first capping layer CAP1 is about In the case where the reflectivity is within the range of about 1 or less, the reflectivity may be within the range of about 1 or less. Fig.13 It is shown that the thickness TH3 of the third capping layer CAP3 is approximately In the case of FIG. 1 , the reflectivity of the first capping layer CAP1 and the thickness TH1 of the second capping layer CAP2 are determined, and thus a detailed description of the reflectivity of each thickness is omitted for convenience of description.

[0175] refer to Fig.14 , showing that the thickness TH3 of the third capping layer CAP3 is approximately For each thickness TH2 of the second capping layer CAP2, the reflectivity according to the thickness TH1 of the first capping layer CAP1 is calculated.

[0176] like Fig.14 As shown in FIG. , the thickness TH3 of the third capping layer CAP3 is approximately In the case of, and the thickness TH2 of the second capping layer CAP2 is about The thickness TH1 of the first capping layer CAP1 is about or greater, the reflectivity may be in the range of about 1 or less. When the thickness TH3 of the third capping layer CAP3 is about In the case of, and the thickness TH2 of the second capping layer CAP2 is about or In the case of , the reflectivity can be in the range of about 1 or less. When the thickness TH3 of the third capping layer CAP3 is about In the case of, and the thickness TH2 of the second capping layer CAP2 is about The thickness TH1 of the first capping layer CAP1 is about In the case where the reflectivity is within the range of about 1 or less, the reflectivity may be within the range of about 1 or less. Fig.14 It is shown that the thickness TH3 of the third capping layer CAP3 is approximately In the case of FIG. 1 , the reflectivity of the first capping layer CAP1 and the thickness TH1 of the second capping layer CAP2 are determined, and thus a detailed description of the reflectivity of each thickness is omitted for convenience of description.

[0177] In an embodiment, the total thickness of the capping layer CAP including the first capping layer CAP1, the second capping layer CAP2, and the third capping layer CAP3 may be approximately To about For example, the thickness TH1 of the first capping layer CAP1 may be about To about In the range of about To about and the thickness TH3 of the third capping layer CAP3 may be in the range of about To about For example, the reflectivity can be reduced while maintaining a luminous efficiency in the range of about 98% or more.

[0178] [Table 2]

[0179]

[0180] Table 2 shows the Figures 10 to 14 Thicknesses TH1, TH2, and TH3 of the first capping layer CAP1, the second capping layer CAP2, and the third capping layer CAP3 of the embodiment and reflectivity and luminous efficiency according to the thicknesses TH1, TH2, and TH3. The numerical value written together with the reflectivity may indicate the ratio (or absolute value) of reflecting external light, and the numerical value written together with the luminous efficiency may indicate the difference with using a polarizing film instead of Figure 6 Compared with the external part of the OUP (or reflection control layer RCL) of the display device, Figure 6 efficiency ratio (or luminous efficiency ratio) of the display device DD.

[0181] In the first case CASE1, the thickness TH1 of the first capping layer CAP1 is about The thickness TH2 of the second capping layer CAP2 is approximately And the thickness TH3 of the third capping layer CAP3 is about In the case of , the reflectivity may be about 0.922 and the luminous efficiency may be about 99.23%.

[0182] In the second case CASE2, the thickness TH1 of the first capping layer CAP1 is about The thickness TH2 of the second capping layer CAP2 is approximately And the thickness TH3 of the third capping layer CAP3 is about In the case of , the reflectivity may be about 0.920 and the luminous efficiency may be about 99.23%.

[0183] The thicknesses TH1, TH2 and TH3 of the first capping layer CAP1, the second capping layer CAP2 and the third capping layer CAP3 according to each of the third case CASE3, the fourth case CASE4, the fifth case CASE5 and the sixth case CASE6 and the reflectivity and luminous efficiency according to the thicknesses TH1, TH2 and TH3 are as described in Table 2, and therefore the detailed description of the third case CASE3 to the sixth case CASE6 is omitted.

[0184] As described above, the capping layer CAP may include a first capping layer CAP1, a second capping layer CAP2, and a third capping layer CAP3, and the refractive index n2 of the second capping layer CAP2 may be greater than each of the refractive index n1 of the first capping layer CAP1 and the refractive index n3 of the third capping layer CAP3. In addition, the thickness TH1 of the first capping layer CAP1 may be about To about In the range of about To about and the thickness TH3 of the third capping layer CAP3 may be in the range of about To about While maintaining the display device DD (reference Figure 6 ) can improve the luminous efficiency, the reflectivity of external light can be reduced, and the display quality of the display device DD can be improved.

[0185] Fig.15 The diagram is included in Figure 6 Schematic cross-sectional view of an embodiment of a capping layer in a display device of FIG. Fig.15 The light emitting element LD, the anti-reflection layer LRL and the encapsulation layer TFE adjacent to the capping layer CAP are further shown. Fig.16 and Fig.17 The diagram is based on Fig.15 Schematic diagram of the luminous efficiency of the capping layer thickness. Fig.18 and Fig.19 The diagram is based on Fig.15Schematic diagram of the reflectivity of the capping layer thickness.

[0186] refer to Fig.15 , the capping layer CAP may include a first capping layer CAP1, a second capping layer CAP2 and a third capping layer CAP3. Fig.10 The structure and function of the capping layer CAP are described, so for the convenience of description, the description thereof is omitted.

[0187] In an embodiment, the refractive index n2 of the second capping layer CAP2 may be smaller than each of the refractive index n1 of the first capping layer CAP1 and the refractive index n3 of the third capping layer CAP3. For example, the refractive index n2 of the second capping layer CAP2 may be smaller than each of the refractive index n1 of the first capping layer CAP1 and the refractive index n3 of the third capping layer CAP3 by about 0.1 or more. For example, each of the refractive index n1 of the first capping layer CAP1 and the refractive index n3 of the third capping layer CAP3 may be in the range of about 1.7 to about 2.2, and the refractive index n2 of the second capping layer CAP2 may be in the range of about 1.2 to about 1.7. For example, the first capping layer CAP1 may be referred to as a first high refractive index capping layer, the second capping layer CAP2 may be referred to as a low refractive index capping layer, and the third capping layer CAP3 may be referred to as a second high refractive index capping layer.

[0188] In an embodiment, the thickness TH1 of the first capping layer CAP1 may be about To about In the range of about To about and the thickness TH3 of the third capping layer CAP3 may be in the range of about To about For example, while maintaining or improving the luminous efficiency (or efficiency) by the capping layer CAP, the reflectivity (or reflectance) of external light can be reduced.

[0189] refer to Fig.16 , showing that the thickness TH3 of the third capping layer CAP3 is approximately For each thickness TH2 of the second capping layer CAP2, the luminous efficiency (or efficiency) according to the thickness TH1 of the first capping layer CAP1 is shown in FIG.

[0190] like Fig.16 As shown in FIG. , the thickness TH3 of the third capping layer CAP3 is approximately In the case where the thickness TH2 of the second capping layer CAP2 is less than about The thickness TH1 of the first capping layer CAP1 is less than about In the case of , the luminous efficiency can be in the range of about 100% or more. When the thickness TH3 of the third capping layer CAP3 is about In the case of, and the thickness TH2 of the second capping layer CAP2 is about The thickness TH1 of the first capping layer CAP1 is less than about In the case of , the luminous efficiency can be in the range of about 98% or more. Fig.16 It is shown that the thickness TH3 of the third capping layer CAP3 is approximately , and thus, for convenience of description, a detailed description of the luminous efficiency of each thickness is omitted.

[0191] refer to Fig.17 , showing that the thickness TH3 of the third capping layer CAP3 is approximately For each thickness TH2 of the second capping layer CAP2, the luminous efficiency (or efficiency) according to the thickness TH1 of the first capping layer CAP1 is shown in FIG.

[0192] like Fig.17 As shown in FIG. , the thickness TH3 of the third capping layer CAP3 is approximately In the case of, and the thickness TH2 of the second capping layer CAP2 is about In the case of , the luminous efficiency can be in the range of about 100% or more. When the thickness TH3 of the third capping layer CAP3 is about In the case of, and the thickness TH2 of the second capping layer CAP2 is about The thickness TH1 of the first capping layer CAP1 is less than about In the case of , the luminous efficiency can be in the range of about 98% or more. Fig.17 It is shown that the thickness TH3 of the third capping layer CAP3 is approximately , and thus, for convenience of description, a detailed description of the luminous efficiency of each thickness is omitted.

[0193] refer to Fig.18 , showing that the thickness TH3 of the third capping layer CAP3 is approximately For each thickness TH2 of the second capping layer CAP2, the reflectivity according to the thickness TH1 of the first capping layer CAP1 is calculated.

[0194] like Fig.18 As shown in FIG. , the thickness TH3 of the third capping layer CAP3 is approximately In the case of, and the thickness TH2 of the second capping layer CAP2 is about The thickness TH1 of the first capping layer CAP1 is about In the case where the thickness TH3 of the third capping layer CAP3 is about 1, the reflectivity may be in the range of about 1 or less. In the case of, and the thickness TH2 of the second capping layer CAP2 is about In the case where the reflectivity is in the range of about 1 or more, the reflectivity can be in the range of about 1 or less. Fig.18 It is shown that the thickness TH3 of the third capping layer CAP3 is approximately In the case of FIG. 1 , the reflectivity of the first capping layer CAP1 and the thickness TH1 of the second capping layer CAP2 are determined, and thus a detailed description of the reflectivity of each thickness is omitted for convenience of description.

[0195] refer to Fig.19 , showing that the thickness TH3 of the third capping layer CAP3 is approximately For each thickness TH2 of the second capping layer CAP2, the reflectivity according to the thickness TH1 of the first capping layer CAP1 is calculated.

[0196] like Fig.19 As shown in FIG. , the thickness TH3 of the third capping layer CAP3 is approximately In the case of, and the thickness TH2 of the second capping layer CAP2 is about or less and the thickness TH1 of the first capping layer CAP1 is about In the case where the thickness TH3 of the third capping layer CAP3 is about 1, the reflectivity may be in the range of about 1 or less. In the case of, and the thickness TH2 of the second capping layer CAP2 is about In the case where the reflectivity is in the range of about 1 or more, the reflectivity can be in the range of about 1 or less. Fig.19 It is shown that the thickness TH3 of the third capping layer CAP3 is approximately In the case of FIG. 1 , the reflectivity of the first capping layer CAP1 and the thickness TH1 of the second capping layer CAP2 are determined, and thus a detailed description of the reflectivity of each thickness is omitted for convenience of description.

[0197] In an embodiment, the total thickness of the capping layer CAP including the first capping layer CAP1, the second capping layer CAP2, and the third capping layer CAP3 may be approximately To about For example, the thickness TH1 of the first capping layer CAP1 may be about To about In the range of about To about and the thickness TH3 of the third capping layer CAP3 may be in the range of about To about For example, the reflectivity can be reduced while maintaining a luminous efficiency in the range of about 98% or more.

[0198] [Table 3]

[0199]

[0200]

[0201] Table 3 shows the Figures 15 to 19 Thicknesses TH1, TH2, and TH3 of the first capping layer CAP1, the second capping layer CAP2, and the third capping layer CAP3 of the embodiment and reflectivity and luminous efficiency according to the thicknesses TH1, TH2, and TH3. The numerical value written together with the reflectivity may indicate the ratio (or absolute value) of reflecting external light, and the numerical value written together with the luminous efficiency may indicate the difference with using a polarizing film instead of Figure 6 Compared with the external part of the OUP (or reflection control layer RCL) of the display device, Figure 6 efficiency ratio (or luminous efficiency ratio) of the display device DD.

[0202] In the first case CASE1, the thickness TH1 of the first capping layer CAP1 is about The thickness TH2 of the second capping layer CAP2 is approximately And the thickness TH3 of the third capping layer CAP3 is about In the case of , the reflectivity may be about 0.959 and the luminous efficiency may be about 99.74%.

[0203] In the second case CASE2, the thickness TH1 of the first capping layer CAP1 is about The thickness TH2 of the second capping layer CAP2 is approximately And the thickness TH3 of the third capping layer CAP3 is about In the case of , the reflectivity may be about 0.943 and the luminous efficiency may be about 98.98%.

[0204] The thicknesses TH1, TH2 and TH3 of the first capping layer CAP1, the second capping layer CAP2 and the third capping layer CAP3 according to each of the third case CASE3, the fourth case CASE4, the fifth case CASE5 and the sixth case CASE6 and the reflectivity and luminous efficiency according to the thicknesses TH1, TH2 and TH3 are as described in Table 3, and therefore for the convenience of description, the detailed description of the third case CASE3 to the sixth case CASE6 is omitted.

[0205] As described above, the capping layer CAP may include a first capping layer CAP1, a second capping layer CAP2, and a third capping layer CAP3, and the refractive index n2 of the second capping layer CAP2 may be smaller than each of the refractive index n1 of the first capping layer CAP1 and the refractive index n3 of the third capping layer CAP3. In addition, the thickness TH1 of the first capping layer CAP1 may be about To about In the range of about To about and the thickness TH3 of the third capping layer CAP3 may be in the range of about To about While maintaining the display device DD (reference Figure 6 ) can improve the luminous efficiency, the reflectivity of external light can be reduced, and the display quality of the display device DD can be improved.

[0206] Fig. 20 The diagram is included in Figure 6 Schematic cross-sectional view of an embodiment of a capping layer in a display device of FIG. Fig. 20 The light emitting element LD, the anti-reflection layer LRL and the encapsulation layer TFE adjacent to the capping layer CAP are further shown. Fig.21 The diagram is based on Fig. 20 Schematic diagram of the luminous efficiency and reflectivity of the thickness of the capping layer.

[0207] refer to Figure 3 , Figure 6 and Fig. 20 , due to the reference Figure 3 The structure and function of the capping layer CAP are described, so for the convenience of description, the description thereof is omitted.

[0208] In an embodiment, the refractive index n of the capping layer CAP (or the first capping layer) may be in the range of about 1.2 to about 1.7. The refractive index of a general capping layer disposed on the second electrode ELT2 to protect the second electrode ELT2 may be in the range of about 1.8 or more. The capping layer CAP having a refractive index n in the range of about 1.2 to about 1.7 may be referred to as a low refractive index capping layer.

[0209] In an embodiment, the thickness TH of the capping layer CAP may be about To about For example, while maintaining or improving the luminous efficiency (or efficiency) by the capping layer CAP, the reflectivity (or reflectance) of external light can be reduced.

[0210] like Fig.21 As shown in FIG. , the thickness TH of the capping layer CAP is about In the case where the thickness of the capping layer CAP is about 100 mm / s or less, the luminous efficiency can be about 90% or more. In the case where the thickness TH of the capping layer CAP is about 100%, the luminous efficiency can be in the range of about 95% or more. As the thickness TH of the capping layer CAP is reduced, the luminous efficiency can be significantly improved. In the case where the thickness TH of the capping layer CAP is about 100%, the luminous efficiency can be in the range of about 95% or more. In this case, the luminous efficiency can be maximized.

[0211] For example, when the thickness TH of the capping layer CAP is about In the case where the thickness TH of the capping layer CAP is about 1, the reflectivity may be in the range of about 1 or less. As the thickness TH of the capping layer CAP increases, the reflectivity may be significantly reduced. In the case where the thickness TH of the capping layer CAP is about In this case, reflectivity can be minimized.

[0212] In an embodiment, the thickness TH of the capping layer CAP may be about To about For example, the reflectivity can be reduced while maintaining a luminous efficiency in the range of about 95% or more.

[0213] [Table 4]

[0214]

[0215] Table 4 shows the Fig. 20 and Fig.21 The thickness TH of the capping layer CAP of the embodiment and the reflectivity and luminous efficiency according to the thickness TH. The numerical value written together with the reflectivity (or the numerical value written in parentheses) may indicate the ratio (or absolute value) of reflecting external light, and the numerical value written together with the luminous efficiency may indicate the difference with using a polarizing film instead of Figure 6 Compared with the external part of the OUP (or reflection control layer RCL) of the display device, Figure 6 efficiency ratio (or luminous efficiency ratio) of the display device DD.

[0216] In the first case CASE1, the thickness TH of the capping layer CAP is about In the case of , the reflectivity may be about 0.991 and the luminous efficiency may be about 102.02%.

[0217] In the second case CASE2, the thickness TH of the capping layer CAP is about In the case of , the reflectivity may be about 0.951 and the luminous efficiency may be about 99.23%.

[0218] In the third case CASE3, the thickness TH of the capping layer CAP is about In the case of , the reflectivity may be about 0.920 and the luminous efficiency may be about 95.94%.

[0219] As described above, the refractive index n of the capping layer CAP may be in the range of about 1.2 to about 1.7, and the thickness TH of the capping layer CAP may be in the range of about To about For example, while maintaining the display device DD (reference Figure 6 ) can improve the luminous efficiency, the reflectivity of external light can be reduced, and the display quality of the display device DD can be improved.

[0220] exist Fig. 20 In the embodiment, another capping layer (e.g., a second capping layer or a high refractive index capping layer) may be disposed on at least one of the upper surface (or first surface) and the lower surface (or second surface) of the capping layer CAP (or the first capping layer). For example, the high refractive index capping layer may be disposed on the capping layer CAP and may be disposed on the capping layer CAP. Figure 7 or Fig.10 As another example, the high refractive index capping layer may be disposed below the capping layer CAP and may be Fig.15 The same as the embodiment.

[0221] At the end of the detailed description, those skilled in the art will appreciate that many changes and modifications may be made to the embodiments without departing substantially from the principles, spirit and scope of the present disclosure. Therefore, the disclosed embodiments are used only in a general and descriptive sense, and not for the purpose of limitation.

Claims

1. A display device, comprising: A light emitting element is disposed on the substrate; A capping layer, disposed on the light emitting element; an anti-reflection layer, disposed on the capping layer; as well as an encapsulation layer, disposed on the anti-reflection layer, Wherein, the capping layer comprises: A first capping layer, disposed on the light emitting element; and a second capping layer disposed on the first capping layer and having a refractive index greater than that of the first capping layer; The thickness of the first capping layer is to within the range of The thickness of the second capping layer is to within the range.

2. The display device according to claim 1, wherein: The anti-reflection layer includes ytterbium or bismuth, and The first capping layer and the second capping layer include an inorganic material.

3. The display device according to claim 1, wherein: The total thickness of the capping layer is to within the range.

4. The display device according to claim 1, wherein: The refractive index of the second capping layer is greater than the refractive index of the first capping layer by 0.1 or more, The refractive index of the first capping layer is in the range of 1.2 to 1.7, and The refractive index of the second capping layer is in the range of 1.7 to 2.

2.

5. The display device according to claim 1, wherein: The thickness of the first capping layer is to within the range of The thickness of the second capping layer is to within the range.

6. The display device according to claim 5, wherein: The total thickness of the first capping layer and the second capping layer is to within the range.

7. The display device according to claim 1, wherein: The capping layer further includes a third capping layer disposed between the second capping layer and the anti-reflection layer and having a refractive index smaller than the refractive index of the second capping layer, and The thickness of the third capping layer is to within the range.

8. The display device according to claim 7, wherein: The refractive index of the second capping layer is 0.1 or more greater than the refractive index of each of the first capping layer and the third capping layer, The refractive index of the first capping layer is in the range of 1.2 to 1.7, The refractive index of the second capping layer is in the range of 1.7 to 2.2, and The refractive index of the third capping layer is in the range of 1.2 to 1.

7.

9. The display device according to claim 7, wherein: The thickness of the first capping layer is to within the range of The thickness of the second capping layer is to within the range of The thickness of the third capping layer is to within the range.

10. The display device according to claim 9, wherein: The total thickness of the first capping layer, the second capping layer and the third capping layer is to within the range.

11. The display device according to any one of claims 1 to 10, wherein: The light emitting element comprises: a first electrode; a light-emitting layer, disposed on the first electrode; and A second electrode is disposed on the light-emitting layer, and The capping layer is disposed between the second electrode and the anti-reflection layer.

12. A display device, comprising: A light emitting element is disposed on the substrate; A capping layer, disposed on the light emitting element; an anti-reflection layer, disposed on the capping layer; as well as an encapsulation layer, disposed on the anti-reflection layer, Wherein, the capping layer comprises: A first capping layer, disposed on the light emitting element; A second capping layer disposed on the first capping layer and having a refractive index lower than that of the first capping layer; and a third capping layer disposed on the second capping layer and having a refractive index greater than the refractive index of the second capping layer, The thickness of the first capping layer is to within the range of The thickness of the second capping layer is to within the range of The thickness of the third capping layer is to within the range.

13. The display device according to claim 12, wherein: The refractive index of the second capping layer is smaller than the refractive index of each of the first capping layer and the third capping layer by 0.1 or more, The refractive index of the first capping layer is in the range of 1.7 to 2.2, The refractive index of the second capping layer is in the range of 1.2 to 1.7, and The refractive index of the third capping layer is in the range of 1.7 to 2.

2.

14. The display device according to claim 12, wherein: The thickness of the first capping layer is to within the range of The thickness of the second capping layer is to within the range of The thickness of the third capping layer is to within the range.

15. The display device according to claim 14, wherein: The total thickness of the capping layer is to within the range.

16. The display device according to any one of claims 12 to 15, wherein: The light emitting element comprises: a first electrode; a light-emitting layer, disposed on the first electrode; and A second electrode is disposed on the light-emitting layer, and The capping layer is disposed between the second electrode and the anti-reflection layer.

17. A display device comprising: A light emitting element is disposed on the substrate; A first capping layer, disposed on the light emitting element; An anti-reflection layer, disposed on the first capping layer; as well as The encapsulation layer is disposed on the anti-reflection layer, wherein: The refractive index of the first capping layer is in the range of 1.2 to 1.7, and The thickness of the first capping layer is to within the range.

18. The display device according to claim 17, wherein: The thickness of the first capping layer is to within the range.

19. The display device according to claim 17, wherein: The light emitting element comprises: a first electrode; a light-emitting layer, disposed on the first electrode; and A second electrode is disposed on the light-emitting layer, and The first capping layer is disposed between the second electrode and the anti-reflection layer.

20. The display device according to any one of claims 17 to 19, further comprising: A second capping layer is provided on at least one of the first surface and the second surface of the first capping layer, wherein: The refractive index of the second capping layer is 0.1 or more greater than the refractive index of the first capping layer, and The refractive index of the second capping layer is in the range of 1.7 to 2.2.

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