Organic Light-Emitting Display

Abstract

An organic light emitting display is provided. The organic light emitting display includes: a first substrate; a plurality of organic light emitting diodes disposed on the first substrate; a encapsulation layer disposed on the organic light emitting diodes; and a plurality of first color conversion filters disposed on the encapsulation layer. The encapsulation layer includes: a first sub-inorganic layer disposed on the organic light emitting diodes; a second sub-inorganic layer disposed on the first sub-inorganic layer and having a refractive index different from that of the first sub-inorganic layer; an organic layer disposed on the second sub-inorganic layer; and a third sub-inorganic layer disposed on the organic layer.

Description

[0001] This application claims the priority and benefit of Korean Patent Application No. 10-2019-0014470, filed with the Korean Intellectual Property Office on February 7, 2019, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0002] The present disclosure relates to an organic light emitting display (OLED), and more particularly, to an OLED including a quantum dot color conversion filter. Background Art

[0003] With the development of multimedia, display devices are becoming increasingly important. Accordingly, various types (e.g., various kinds) of display devices (such as organic light emitting displays (OLEDs) and liquid crystal displays (LCDs)) are being used.

[0004] In a display device, an OLED includes an organic light emitting diode as a self-luminous element. The organic light emitting diode may include two electrodes facing each other and an organic light emitting layer disposed between the two electrodes. Electrons and holes provided from the two electrodes may recombine in the organic light emitting layer to generate excitons. When the generated excitons change from an excited state to a ground state, light may be emitted.

[0005] Since an OLED does not require a light source, the OLED has low power consumption, can be made lightweight and thin, and has a wide viewing angle, high brightness, high contrast, and fast response speed. Due to these desirable (e.g., high-quality) characteristics, OLEDs are attracting attention as next-generation display devices.

[0006] In addition, quantum dots are nanoscale semiconductor particles having a size of several nanometers and having a quantum confinement effect. In a bulk state, quantum dots exhibit suitable (e.g., excellent) optical properties and electrical properties that general semiconductor materials do not have. When excited by energy (such as light), quantum dots may emit light, and the color of the emitted light varies according to the size of the particles.

[0007] By using quantum dots, it is possible to implement a large-area and high-resolution display device having good color purity, suitable (e.g., excellent) color reproducibility, and good moving image characteristics. Accordingly, a great deal of research is being conducted. Summary of the Invention

[0008] Aspects of the present disclosure relate to an organic light emitting display (OLED) that improves brightness by matching the refractive indices of elements disposed on an organic light emitting layer.

[0009] However, aspects of the present disclosure are not limited to the aspects set forth herein. The above and other aspects of the present disclosure will become more apparent to those of ordinary skill in the art to which the present disclosure pertains by referring to the detailed description of the present disclosure given below.

[0010] According to an embodiment, an organic light emitting display includes: a first substrate; a plurality of organic light emitting diodes disposed on the first substrate; a encapsulation layer disposed on the plurality of organic light emitting diodes; and a plurality of first color conversion filters disposed on the encapsulation layer, wherein the encapsulation layer includes: a first sub-inorganic layer disposed on the plurality of organic light emitting diodes; a second sub-inorganic layer disposed on the first sub-inorganic layer and having a refractive index different from that of the first sub-inorganic layer (e.g., the refractive index of the second sub-inorganic layer is different from that of the first sub-inorganic layer); an organic layer disposed on the second sub-inorganic layer; and a third sub-inorganic layer disposed on the organic layer.

[0011] According to an embodiment, an organic light emitting display includes a non-light emitting region and a plurality of color regions. The organic light emitting display includes: a plurality of organic light emitting diodes respectively disposed in the plurality of color regions; an encapsulation layer disposed on the organic light emitting diodes; and a wavelength conversion pattern disposed on the encapsulation layer and in at least one of the plurality of color regions, wherein the encapsulation layer includes: a first inorganic layer disposed on the plurality of organic light emitting diodes; an organic layer disposed on the first inorganic layer; and a second inorganic layer disposed on the organic layer, wherein the first inorganic layer includes a first sub-inorganic layer and a second sub-inorganic layer, the second sub-inorganic layer having a refractive index greater than that of the first sub-inorganic layer, and the second inorganic layer includes a third sub-inorganic layer and a fourth sub-inorganic layer, the fourth sub-inorganic layer having a refractive index greater than that of the third sub-inorganic layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and other aspects of the present disclosure will become apparent and easier to understand by the following description of embodiments in conjunction with the accompanying drawings, in which:

[0013] Figure 1 is a perspective view of an organic light emitting display (OLED) according to an embodiment;

[0014] Figure 2 is along Figure 1 a schematic cross-sectional view of the OLED taken along line I1-I1';

[0015] Figure 3 is a schematic plan view of the OLED according to an embodiment;

[0016] Figure 4 is along Figure 3 a cross-sectional view of the OLED taken along line I2-I2';

[0017] Figure 5 is Figure 4 an enlarged cross-sectional view of the organic light-emitting diode shown in

[0018] Figure 6 is Figure 5 a cross-sectional view of a modified example of the organic light-emitting diode shown in

[0019] Figure 7 is Figure 5 a cross-sectional view of a modified example of the organic light-emitting diode shown in

[0020] Figure 8 is a schematic cross-sectional view showing the optical path between the second interlayer insulating layer and the second cover layer in the embodiment of Figure 4 ;

[0021] Figure 9 is a schematic cross-sectional view showing the optical path in another OLED as a comparative example of Figure 8 ;

[0022] Figure 10 is a schematic cross-sectional view of a part of the OLED according to the first experimental example;

[0023] Figure 11 is a schematic cross-sectional view of a part of the OLED according to the second experimental example;

[0024] Figure 12 is a schematic cross-sectional view of a part of the OLED according to the third experimental example;

[0025] Figure 13 is a schematic cross-sectional view of a part of the OLED according to the fourth experimental example;

[0026] Figure 14 is a schematic cross-sectional view of a part of the OLED according to the fifth experimental example;

[0027] Figure 15 is a schematic cross-sectional view of a part of the OLED according to the sixth experimental example;

[0028] Figure 16 is a cross-sectional view of the OLED according to the embodiment;

[0029] Figure 17 is a cross-sectional view of the OLED according to the embodiment; and

[0030] Figure 18 is a cross-sectional view of the OLED according to the embodiment. Detailed Description

[0031] The features of the present disclosure and its implementation method can be more easily understood by referring to the detailed description of the following embodiments and the accompanying drawings. However, the subject matter of the present disclosure can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the subject matter of the present disclosure to those skilled in the art, and the subject matter of the present disclosure will be defined only by the appended claims and their equivalents. Throughout the specification, the same reference numerals denote the same elements.

[0032] It will be understood that when an element or layer is referred to as being "on", "connected to" or "coupled to" another element or layer, it can be directly on, directly connected to or directly coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on", "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0033] It will be understood that although the terms "first", "second", etc. may be used herein to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Thus, without departing from the teachings of the present disclosure, the first element, component, region, layer or part discussed below may be termed a second element, component, region, layer or part.

[0034] The terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the subject matter of the present disclosure. As used herein, unless the context clearly dictates otherwise, the singular forms "a", "an" and "the" are also intended to include the plural forms. It will also be understood that when the terms "comprises" and / or its variants are used in this specification, it is specified that there are the stated features, integers, steps, operations, elements, components and / or groups thereof, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0035] An organic light emitting display (OLED) according to various embodiments of the present disclosure is a device for displaying moving images and / or still images and / or a device for displaying stereoscopic images. The OLED can be used as a display screen of a portable electronic device (such as a mobile communication terminal, a smart phone, a tablet computer, a smart watch, and / or a navigation system) and a display screen of various products (such as a television, a notebook, a monitor, a billboard, and / or the Internet of Things). However, the embodiments of the present disclosure are not limited thereto, and without departing from the spirit of the present disclosure, the OLED can also be used as a display screen of other electronic devices.

[0036] Hereinafter, embodiments of the present disclosure will be described in more detail with reference to the drawings. The same reference numerals or similar reference numerals will be used for the same elements in the drawings.

[0037] Figure 1 is a perspective view of an OLED1 according to an embodiment. Figure 2 is along Figure 1 A schematic cross-sectional view of the OLED1 taken along the line I1-I1'. Figure 3 is a schematic plan view of the OLED1 according to an embodiment.

[0038] Referring to Figures 1 to 3 , the OLED1 includes a display area DA and a non-display area NDA.

[0039] The display area DA is defined as an area for displaying an image. Elements for displaying an image can be provided in the display area DA.

[0040] In an embodiment, the display area DA may have a flat shape. The display area DA may be provided in the central portion of the OLED1. However, the position and shape of the display area DA are not limited to the position and shape shown in the drawings. In an embodiment, the display area DA may be provided at the edge of the OLED1, and / or at least a part of the display area DA may be curved.

[0041] The display area DA includes a light-emitting area and a non-light-emitting area NLA.

[0042] The light-emitting area is defined as a part through which light of the display area DA is transmitted and viewed by a user. The light-emitting area may include a plurality of color areas LA11 to LAmn. The color areas LA11 to LAmn may be arranged in a matrix (for example, in the shape of a matrix). For example, the color areas LA11 to LAmn may be arranged in an n×m matrix. As exemplary color areas, the first color area LA11 in the first row and the first column, the second color area LA12 in the first row and the second column, and the third color area LA13 in the first row and the third column will be described below.

[0043] The color regions LA11 to LAmn may include a red light-emitting region, a green light-emitting region, and a blue light-emitting region. In some embodiments, a white light-emitting region may also be provided. In an embodiment, the color regions LA11 to LAmn may include a cyan light-emitting region, a magenta light-emitting region, and a yellow light-emitting region instead of a red light-emitting region, a green light-emitting region, and a blue light-emitting region. Hereinafter, a case where the light-emitting region of the OLED1 includes a first color region LA11, a second color region LA12, and a third color region LA13 that respectively emit red light, green light, and blue light will be described as an example. However, the colors (e.g., color types) and the arrangement order of the first color region LA11, the second color region LA12, and the third color region LA13 are not limited to this example.

[0044] In this specification, blue light refers to light having a wavelength range of about 450 nm to about 495 nm, green light refers to light having a wavelength range of about 495 nm to about 570 nm, and red light refers to light having a wavelength range of about 620 nm to about 750 nm.

[0045] The first color region LA11, the second color region LA12, and the third color region LA13 may be alternately arranged along the column direction and / or the row direction. Each of the first color region LA11, the second color region LA12, and the third color region LA13 may have a quadrilateral shape.

[0046] As used herein, the row direction represents a first direction dr1, and the first direction dr1 is a horizontal direction in the drawings. As used herein, the column direction represents a second direction dr2, and the second direction dr2 is a vertical direction in the drawings. The row direction and the column direction are directions that intersect (e.g., cross) each other. That is, the first direction dr1 is a direction that intersects (e.g., crosses) the second direction dr2. In addition, a third direction dr3 represents a direction perpendicular to or intersecting the second direction dr2 and the first direction dr1. That is, the third direction dr3 is the thickness direction of the OLED1 (e.g., the thickness direction of the first substrate 10). However, the embodiments are not limited to the directions mentioned above, and it should be understood that one of the first direction dr1, the second direction dr2, and the third direction dr3 is a direction perpendicular to or intersecting all other directions (e.g., opposite directions).

[0047] In one embodiment, the color regions LA11 to LAmn may have different sizes. In this case, the size of the third color region LA13 may be larger than the size of the first color region LA11, and the size of the first color region LA11 may be larger than the size of the second color region LA12. However, the order of the sizes of the first color region LA11 to the third color region LA13 is not limited to this example.

[0048] The non-light-emitting area NLA is defined as an area for separating color areas LA11 to LAmn in the display area DA. That is, the non-light-emitting area NLA can be an area through which light does not transmit. The non-light-emitting area NLA can surround each of the color areas LA11 to LAmn. For example, the non-light-emitting area NLA can be in a mesh shape.

[0049] The non-display area NDA is defined as an area that does not display an image. The non-display area NDA is provided on at least one side of the display area DA. For example, the non-display area NDA can surround the display area DA. In an embodiment, a speaker module and a sensor module can be provided in the non-display area NDA. In an embodiment, the sensor module can include at least one of a remote control sensor, an illuminance sensor, a proximity sensor, an infrared sensor, and an ultrasonic sensor.

[0050] The OLED1 can have a stacked structure, which includes, for example, a first substrate 10, a second substrate 30 facing the first substrate 10, a filling layer 70 disposed between the first substrate 10 and the second substrate 30, and a sealing portion 50 that binds the first substrate 10 and the second substrate 30 together at the edge of the filling layer 70.

[0051] The first substrate 10 can include elements and circuits for displaying an image, for example, a pixel circuit (such as a switching element) and an organic light-emitting diode. The first substrate 10 can be a display substrate.

[0052] The second substrate 30 can be located above the first substrate 10 and face the first substrate 10. The second substrate 30 can be, but is not limited to, a color conversion substrate that includes a color conversion filter for converting the color of light emitted from the first substrate 10.

[0053] The sealing portion 50 can be located between the first substrate 10 and the second substrate 30. The sealing portion 50 can be provided in the non-display area NDA along the edges of the first substrate 10 and the second substrate 30. The first substrate 10 and the second substrate 30 can be bound together by the sealing portion 50. The sealing portion 50 can include, but is not limited to, an organic material such as epoxy resin.

[0054] The filling layer 70 can be located in the space between the first substrate 10 and the second substrate 30 and be surrounded by the sealing portion 50. The filling layer 70 can fill the space between the first substrate 10 and the second substrate 30. The filling layer 70 can be made of a material that can transmit light. For example, the filling layer 70 can include a silicon-based organic material, an epoxy-based organic material, an epoxy-acrylic organic material, and / or another suitable organic material (e.g., an organic substance). In some embodiments, the filling layer 70 can be a silicone rubber or an air layer. Here, the air layer can contain an inert gas (such as nitrogen or argon), or can contain various gas mixtures.

[0055] Now, reference will be made to Figure 4 and Figure 5 to describe the stacked structure of OLED1 in more detail. The following description will be given based on a first color region LA11, a second color region LA12, and a third color region LA13, which are exemplary color regions included in the light-emitting region.

[0056] Figure 4 is a cross-sectional view of OLED1 taken along the line I2-I2'. Figure 3 along the line I2-I2' Figure 5 is Figure 4 an enlarged cross-sectional view of the organic light-emitting diode 310 shown in

[0057] Now, the first substrate 10 will be described in more detail.

[0058] The first substrate 10 includes a first base substrate 101, a plurality of switching elements TR1, TR2, and TR3 disposed on the first base substrate 101, a plurality of organic light-emitting diodes 310 disposed on the switching elements TR1, TR2, and TR3, and a encapsulation layer 400 disposed on the organic light-emitting diodes 310.

[0059] The display region DA and the non-display region NDA described above can be defined in the first substrate 10.

[0060] The first base substrate 101 may be a rigid substrate. Here, the first base substrate 101 may be one selected from a glass substrate, a quartz substrate, a glass-ceramic substrate, a crystallized glass substrate, and a reinforced plastic.

[0061] A buffer layer 201 is disposed on the first base substrate 101. The buffer layer 201 is used to smooth the surface of the first base substrate 101 and to prevent or reduce the introduction of moisture and / or external air. The buffer layer 201 may be an inorganic layer. The buffer layer 201 may be a single layer or a multi-layer.

[0062] The switching elements TR1, TR2, and TR3 are disposed on the buffer layer 201. Each of the switching elements TR1, TR2, and TR3 may be a thin-film transistor. Each of the switching elements TR1, TR2, and TR3 shown in the drawings may be a driving thin-film transistor.

[0063] The switching elements TR1, TR2, and TR3 may include a first switching element TR1, a second switching element TR2, and a third switching element TR3. One or more of the switching elements TR1, TR2, or TR3 may be disposed in each of the color regions LA11, LA12, and LA13. For example, the first switching element TR1 may be disposed in the first color region LA11, the second switching element TR2 may be disposed in the second color region LA12, and the third switching element TR3 may be disposed in the third color region LA13.

[0064] The switching elements TR1, TR2, and TR3 may respectively include semiconductor layers A1, A2, and A3, gate electrodes G1, G2, and G3, source electrodes S1, S2, and S3, and drain electrodes D1, D2, and D3. For example, the semiconductor layers A1, A2, and A3 are disposed on the buffer layer 201. The semiconductor layers A1, A2, and A3 may include amorphous silicon, polysilicon, low-temperature polysilicon, and / or an organic semiconductor. In an embodiment, the semiconductor layers A1, A2, and A3 may be an oxide semiconductor. In one embodiment, each of the semiconductor layers A1, A2, and A3 may include a channel region and source and drain regions that are disposed on both sides of the channel region and doped with impurities.

[0065] The gate insulating layer 211 is disposed on the semiconductor layers A1, A2, and A3. The gate insulating layer 211 may be an inorganic layer. The gate insulating layer 211 may be a single layer or a multi-layer.

[0066] The gate electrodes G1, G2, and G3 are disposed on the gate insulating layer 211. The gate electrodes G1, G2, and G3 may be made of a conductive metal material. For example, the gate electrodes G1, G2, and G3 may include molybdenum (Mo), aluminum (Al), copper (Cu), and / or titanium (Ti). Each of the gate electrodes G1, G2, and G3 may be a single layer or a multi-layer.

[0067] The first interlayer insulating layer 212 is disposed on the gate electrodes G1, G2, and G3. The first interlayer insulating layer 212 may be an inorganic layer. The first interlayer insulating layer 212 may be a single layer or a multi-layer.

[0068] The source electrodes S1, S2, and S3 and the drain electrodes D1, D2, and D3 are disposed on the first interlayer insulating layer 212. The source electrodes S1, S2, and S3 and the drain electrodes D1, D2, and D3 are made of a conductive metal material. For example, the source electrodes S1, S2, and S3 and the drain electrodes D1, D2, and D3 may include aluminum (Al), copper (Cu), titanium (Ti), and / or molybdenum (Mo).

[0069] The source electrodes S1, S2, and S3 and the drain electrodes D1, D2, and D3 can be electrically connected to the source regions and drain regions of the semiconductor layers A1, A2, and A3 respectively through contact holes passing through the first interlayer insulating layer 212 and the gate insulating layer 211.

[0070] In one embodiment, the OLED1 may further include a storage capacitor and a switching transistor located on the first substrate 101.

[0071] A protective layer 220 is disposed on the source electrodes S1, S2, and S3, the drain electrodes D1, D2, and D3, and the first interlayer insulating layer 212. Here, the protective layer 220 covers the circuit unit including the switching elements TR1, TR2, and TR3. The protective layer 220 may be a passivation layer or a planarization layer. The passivation layer may include SiO2 and / or SiN x etc., and the planarization layer may include materials such as acrylic acid and / or polyimide. The protective layer 220 may also include both a passivation layer and a planarization layer. In this case, the passivation layer may be disposed on the source electrodes S1, S2, and S3, the drain electrodes D1, D2, and D3, and the first interlayer insulating layer 212, and the planarization layer may be disposed on the passivation layer. The upper surface of the protective layer 220 may be flat.

[0072] The organic light-emitting diodes 310 may be disposed on the protective layer 220. The organic light-emitting diodes 310 may be respectively disposed in the color regions LA11, LA12, and LA13. Each element of the organic light-emitting diode 310 will now be described in more detail.

[0073] A plurality of first pixel electrodes 311 may be disposed on the protective layer 220. The first pixel electrodes 311 may be pixel electrodes respectively disposed in the color regions LA11, LA12, and LA13. In addition, the first pixel electrodes 311 may be the anodes of the organic light-emitting diodes 310.

[0074] The first pixel electrodes 311 may be electrically connected to the drain electrodes D1, D2, and D3 (or the source electrodes S1, S2, and S3) disposed on the first substrate 101 respectively through through-holes passing through the protective layer 220.

[0075] The first pixel electrodes 311 may include materials having a high work function. The first pixel electrodes 311 may include indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), and / or indium oxide (In2O3).

[0076] In an embodiment, the areas respectively occupied by the first pixel electrodes 311 in the color regions LA11, LA12, and LA13 may be the same in a plan view. That is, the first pixel electrodes 311 in the color regions LA11, LA12, and LA13 may have the same surface area in a plan view.

[0077] The pixel defining layer 330 is disposed on the first pixel electrode 311. The pixel defining layer 330 includes openings that expose at least a portion of each of the first pixel electrodes 311. In an embodiment, the openings may have different widths in the color regions LA11, LA12, and LA13. For example, the openings may have a smaller (e.g., decreasing) width in the order of the opening in the second color region LA12, the opening in the first color region LA11, and the opening in the third color region LA13. That is, the area of the first pixel electrode 311 exposed by the pixel defining layer 330 may increase in the order of the third color region LA13, the first color region LA11, and the second color region LA12.

[0078] The pixel defining layer 330 may include an organic material and / or an inorganic material. In an embodiment, the pixel defining layer 330 may include materials such as photoresist, polyimide resin, acrylic resin, silicon compound, and / or polyacrylic resin.

[0079] The organic light emitting layer 320 may be disposed on each of the first pixel electrodes 311 exposed by the pixel defining layer 330. For example, the organic light emitting layer 320 may have a structure in which a first hole transport layer HTL1, a first light emitting layer EL11, and a first electron transport layer ETL1 are sequentially stacked therein. In an embodiment, the organic light emitting layers 320 respectively disposed in the color regions LA11, LA12, and LA13 may all be blue organic light emitting layers.

[0080] The second pixel electrode 312 is disposed on the first electron transport layer ETL1. The second pixel electrode 312 may be a common electrode disposed over the entire first substrate 101 without distinguishing between the color regions LA11, LA12, and LA13. In addition, the second pixel electrode 312 may be the cathode of each of the organic light emitting diodes 310.

[0081] The second pixel electrode 312 may include a material having a low work function. The second pixel electrode 312 may include Li, Ca, LiF / Ca, LiF / Al, Al, Mg, Ag, Pt, Pd, Ni, Au, Nd, Ir, Cr, BaF2, Ba, or a compound or mixture thereof (e.g., a mixture of Ag and Mg). The second pixel electrode 312 may further include an auxiliary electrode. The auxiliary electrode may include a layer formed by depositing one of the above materials and a transparent metal oxide (such as ITO, IZO, ZnO, and / or ITZO) formed on the layer.

[0082] When the OLED1 is a top-emitting OLED, a thin conductive layer having a low work function can be formed as the second pixel electrode 312, and a transparent conductive layer (such as an ITO layer, an IZO layer, a ZnO layer, and / or an In2O3 layer) can be stacked on the thin conductive layer.

[0083] In each of the color regions LA11, LA12, and LA13, the first pixel electrode 311, the first hole transport layer HTL1, the first light-emitting layer EL11, the first electron transport layer ETL1, and the second pixel electrode 312 can constitute (e.g., form) an organic light-emitting diode 310.

[0084] The type (e.g., kind) and stacking order of the elements of each organic light-emitting diode 310 are not limited to the type and stacking order shown in the drawings. Various modified embodiments of the organic light-emitting diode 310 can be applied to the OLED1, which will be described in more detail later with reference to Figure 6 and Figure 7 this.

[0085] The second interlayer insulating layer 350 is disposed on the second pixel electrode 312. The second interlayer insulating layer 350 can be a single layer or a multi-layer. When the second interlayer insulating layer 350 is formed as a single layer, the second interlayer insulating layer 350 can include an inorganic material (e.g., an inorganic substance), and when the second interlayer insulating layer 350 is formed as a multi-layer, the second interlayer insulating layer 350 can be an organic-inorganic composite material. For example, the second interlayer insulating layer 350 can include a metal fluoride, a metal oxide, a metal nitride, and / or a metal oxynitride. The second interlayer insulating layer 350 can be formed by sputtering, atomic layer deposition (ALD), and / or chemical vapor deposition (CVD).

[0086] The thickness of the second interlayer insulating layer 350 can be about or less. The second interlayer insulating layer 350 can have a first refractive index. For example, when the second interlayer insulating layer 350 is a single layer, for light having a wavelength of about 560 nm (e.g., having a wavelength of about 560 nm), the first refractive index can have a range of about 1.9 to about 2.5. Throughout the specification, the expression "light having a number followed by the unit nm" refers to light having a wavelength of the specified number. For example, the expression "light having a wavelength of about 560 nm" refers to light having a wavelength of about 560 nm. When the second interlayer insulating layer 350 is a multi-layer, for light having a wavelength of about 560 nm, the first refractive index can have a range of about 1.4 to about 2.5.

[0087] The second interlayer insulating layer 350 can improve the light extraction of the organic light-emitting diode 310. In an embodiment, the second interlayer insulating layer 350 can be omitted (e.g., not included). Hereinafter, the term "omitted" means that a feature is not included in the structure or the description of the feature is not repeated.

[0088] The encapsulation layer 400 is disposed on the second interlayer insulating layer 350. In an embodiment where the second interlayer insulating layer 350 is omitted, the encapsulation layer 400 may be directly disposed on the second pixel electrode 312.

[0089] The encapsulation layer 400 includes an inorganic layer. The encapsulation layer 400 may include a plurality of stacked layers. In the drawings, the encapsulation layer 400 is shown as a multi-layer including a first inorganic layer 410, an organic layer 420, and a second inorganic layer 430 sequentially stacked on the second interlayer insulating layer 350.

[0090] The first inorganic layer 410 may be a multi-layer. In the current embodiment, the first inorganic layer 410 may have a structure in which a first sub-inorganic layer 411, a second sub-inorganic layer 412, and a third sub-inorganic layer 413 are sequentially stacked. The first sub-inorganic layer 411, the second sub-inorganic layer 412, and the third sub-inorganic layer 413 may have the same refractive index or different refractive indices. In an embodiment, the thickness of the first inorganic layer 410 may be about 2 μm or less. That is, the sum of the thicknesses of the first sub-inorganic layer 411, the second sub-inorganic layer 412, and the third sub-inorganic layer 413 may be about 2 μm or less.

[0091] The first sub-inorganic layer 411 is disposed on the second interlayer insulating layer 350. The first sub-inorganic layer 411 may include a metal oxide, a metal nitride, and / or a metal oxynitride.

[0092] The first sub-inorganic layer 411 may include a material having a second refractive index. For example, for light of about 560 nm, the second refractive index may have a range of about 1.4 to about 1.6. The second refractive index may be lower than the first refractive index, but is not limited thereto. That is, the first sub-inorganic layer 411 may be a material that is substantially less dense than the second interlayer insulating layer 350.

[0093] In this specification, a less dense material refers to a material having a relatively low refractive index and through which waves (such as light waves) propagate at a relatively fast speed. That is, a dense material is a material that is relatively denser (e.g., optically denser) than a less dense material. Dense materials and less dense materials are clearly understood as relative concepts between two materials.

[0094] The thickness of the first sub-inorganic layer 411 may be about or less. The first sub-inorganic layer 411 may be, but is not limited to, a single layer. The first sub-inorganic layer 411 may be formed by sputtering, ALD, and / or CVD. In an embodiment, the first sub-inorganic layer 411 may be omitted.

[0095] The second sub-inorganic layer 412 is disposed on the first sub-inorganic layer 411. The second sub-inorganic layer 412 may be made of the same material as that of the first sub-inorganic layer 411, or may include one of the materials exemplified in connection with the first sub-inorganic layer 411.

[0096] The second sub-inorganic layer 412 may include a material having a third refractive index. For example, for light of about 560 nm, the third refractive index may have a range of about 1.4 to about 1.6. In an embodiment, the third refractive index may be substantially equal to the second refractive index.

[0097] The thickness of the second sub-inorganic layer 412 may be about or greater. In an embodiment, the second sub-inorganic layer 412 may be a single layer. The second sub-inorganic layer 412 may be formed by the same process as that of the first sub-inorganic layer 411 (e.g., the same type of process, e.g., the same method), or may be formed by combining one of the processes exemplified in connection with the first sub-inorganic layer 411.

[0098] When the first sub-inorganic layer 411 and the second sub-inorganic layer 412 include the same material and are formed by the same process (e.g., the same type of process), the first sub-inorganic layer 411 may be an element for increasing the thickness of the second sub-inorganic layer 412.

[0099] The third sub-inorganic layer 413 is disposed on the second sub-inorganic layer 412. The third sub-inorganic layer 413 may be made of the same material as that of the first sub-inorganic layer 411, or may include one of the materials exemplified in connection with the first sub-inorganic layer 411.

[0100] The third sub-inorganic layer 413 may include a material having a fourth refractive index. For example, for light of about 560 nm, the fourth refractive index may have a range of about 1.5 to about 1.57. In an embodiment, the fourth refractive index may be higher than the third refractive index. In this case, the third sub-inorganic layer 413 may be made of a material that is substantially denser than the second sub-inorganic layer 412. However, the relationship between the magnitudes of the third refractive index and the fourth refractive index is not limited to this case.

[0101] The thickness of the third sub-inorganic layer 413 may be about or less. In an embodiment, the third sub-inorganic layer 413 may be a single layer. The third sub-inorganic layer 413 may be formed by the same process as that of the first sub-inorganic layer 411 (e.g., the same type of process), or may be formed by combining one of the processes exemplified in connection with the first sub-inorganic layer 411.

[0102] The organic layer 420 is disposed on the third sub-inorganic layer 413. The organic layer 420 can be made of a polymer such as photocurable acrylic, silicone, and / or epoxy resin. The organic layer 420 can be made of a material having an average transmittance of about 88% or higher for light from about 400 nm to about 780 nm and an average transmittance of less than 10% for light from about 380 nm to about 410 nm.

[0103] The organic layer 420 can have a fifth refractive index. For light of about 560 nm, the fifth refractive index can range from about 1.5 to about 1.6. In an embodiment, the fifth refractive index can be lower than the fourth refractive index. In this case, the organic layer 420 can be made of a material that is substantially sparser than the third sub-inorganic layer 413.

[0104] The thickness of the organic layer 420 can be from about 2 μm to about 10 μm. In an embodiment, the organic layer 420 can be a single layer or multiple layers. The organic layer 420 can be formed by inkjet printing, slot coating, screen printing, and / or one-drop filling (or one-drop injection (ODF)).

[0105] The second inorganic layer 430 is disposed on the organic layer 420. The second inorganic layer 430 can be multiple layers. In the present embodiment, the second inorganic layer 430 has a structure in which a fourth sub-inorganic layer 431, a fifth sub-inorganic layer 432, and a sixth sub-inorganic layer 433 are sequentially stacked. The fourth sub-inorganic layer 431, the fifth sub-inorganic layer 432, and the sixth sub-inorganic layer 433 can have the same refractive index or different refractive indices. In an embodiment, the thickness of the second inorganic layer 430 can be about 2.6 μm or less. For example, the sum of the thicknesses of the fourth sub-inorganic layer 431, the fifth sub-inorganic layer 432, and the sixth sub-inorganic layer 433 can be about 2.6 μm or less.

[0106] The fourth sub-inorganic layer 431 is disposed on the organic layer 420. The fourth sub-inorganic layer 431 can be made of the same material as the first sub-inorganic layer 411, or can include one of the materials exemplified in connection with the first sub-inorganic layer 411.

[0107] The fourth sub-inorganic layer 431 can include a material having a seventh refractive index. For example, for light of about 560 nm, the seventh refractive index can range from about 1.5 to about 1.57.

[0108] The thickness of the fourth sub-inorganic layer 431 can be about Or smaller. In an embodiment, the fourth sub-inorganic layer 431 may be a single layer. The fourth sub-inorganic layer 431 may be formed by the same process as the first sub-inorganic layer 411 (e.g., the same type of process), or may be formed by combining one of the processes illustrated for the first sub-inorganic layer 411. In an embodiment, the fourth sub-inorganic layer 431 may be omitted.

[0109] A fifth sub-inorganic layer 432 is disposed on the fourth sub-inorganic layer 431. The fifth sub-inorganic layer 432 may be made of the same material as the first sub-inorganic layer 411, or may include one of the materials illustrated for the first sub-inorganic layer 411.

[0110] The fifth sub-inorganic layer 432 may include a material having an eighth refractive index. For example, for light of about 560 nm, the eighth refractive index may have a range of about 1.6 to about 1.9. In an embodiment, the eighth refractive index may be equal to or higher than the seventh refractive index. In this case, the fifth sub-inorganic layer 432 may be made of the same material as the fourth sub-inorganic layer 431, or may be made of a material that is substantially denser than the fourth sub-inorganic layer 431.

[0111] The thickness of the fifth sub-inorganic layer 432 may be about 2 μm to about 10 μm. In an embodiment, the fifth sub-inorganic layer 432 may be a single layer. The fifth sub-inorganic layer 432 may be formed by the same process as the first sub-inorganic layer 411 (e.g., the same type of process), or may be formed by combining one of the processes illustrated for the first sub-inorganic layer 411.

[0112] When the fourth sub-inorganic layer 431 and the fifth sub-inorganic layer 432 include the same material and are formed by the same process (e.g., the same type of process), the fourth sub-inorganic layer 431 may be an element for increasing the thickness of the fifth sub-inorganic layer 432.

[0113] A sixth sub-inorganic layer 433 is disposed on the fifth sub-inorganic layer 432. The sixth sub-inorganic layer 433 may be made of the same material as the first sub-inorganic layer 411, or may include one of the materials illustrated for the first sub-inorganic layer 411.

[0114] The sixth sub-inorganic layer 433 may include a material having a ninth refractive index. For example, for light of about 560 nm, the ninth refractive index may have a range of about 1.55 to about 1.65. In an embodiment, the ninth refractive index may be higher than the eighth refractive index. In this case, the sixth sub-inorganic layer 433 may be made of a material that is substantially denser than the fifth sub-inorganic layer 432.

[0115] The thickness of the sixth sub-inorganic layer 433 may be about or less. In an embodiment, the sixth sub-inorganic layer 433 may be a single layer. The sixth sub-inorganic layer 433 may be formed by the same process as the first sub-inorganic layer 411 (e.g., the same type of process), or may be formed by combining one of the processes exemplified for the first sub-inorganic layer 411.

[0116] The path of the light emitted from each organic light-emitting diode 310 can be adjusted by adjusting the refractive index of each layer in the encapsulation layer 400. This will be described in more detail later with reference to Figure 8 this.

[0117] Now, the second substrate 30 will be described in more detail. In the drawings, the OLED1 includes a third cover layer 513, a second cover layer 512, a second color conversion filter, a first cover layer 511, and a first color conversion filter that are sequentially disposed on the first substrate 10 and the filling layer 70 along the third direction dr3. Since the second substrate 30 faces the first substrate 10, the direction of the stacking order of the second substrate 30 may be opposite to the direction of the stacking order of the first substrate 10. That is, the direction of the stacking order of the first substrate 10 may be the third direction dr3, and the direction of the stacking order of the second substrate 30 may be a direction opposite to the third direction dr3. Therefore, for ease of description, only in the description of the second substrate 30, when a first element included in the second substrate 30 is described as being disposed on a second element, it means that the first element is disposed from the second element along a direction opposite to the third direction dr3.

[0118] The second substrate 30 includes a second base substrate 601, a first black matrix 521, a first color conversion filter, a first cover layer 511, a second color conversion filter, a second cover layer 512, a second black matrix 522, and a third cover layer 513 that are sequentially stacked. In addition, the second substrate 30 may further include a light transmission pattern 533 formed on the same layer as the second color conversion filter.

[0119] A light-emitting region including color regions LA11, LA12, and LA13 and a non-light-emitting region NLA may be defined in the second substrate 30.

[0120] The second base substrate 601 may be made of a light-transmissive material. The second base substrate 601 may be a glass substrate and / or a plastic substrate. In an embodiment, the second base substrate 601 may be a window member. The window member may protect the first substrate 10 and the second substrate 30 from external scratches and the like.

[0121] The first black matrix 521 is disposed on the second substrate base 601. The first black matrix 521 may be disposed along the boundary of each of the color regions LA11, LA12, and LA13, and may block the transmission of light. The first black matrix 521 may be stacked with the pixel defining layer 330. Throughout the present disclosure, when two elements are described as being "stacked" with each other, unless otherwise defined, it means that the two elements are stacked with each other in the thickness direction (i.e., the third direction dr3) of the OLED1. The first black matrix 521 may include openings respectively defining the color regions LA11, LA12, and LA13.

[0122] The first black matrix 521 may be made of any suitable material that can block light. In an embodiment, the first black matrix 521 may be made of a photosensitive composition, an organic material (e.g., an organic substance), and / or a metal material. In an embodiment, the photosensitive composition may include an adhesive resin, a polymerizable monomer, a polymerizable oligomer, a pigment, a dispersant, etc. The metal material may include chromium, etc.

[0123] The first color conversion filter is disposed on the second substrate base 601 and the first black matrix 521. The first color conversion filter may be stacked with the openings of the first black matrix 521.

[0124] In an embodiment, the first color conversion filter may be a color filter 540. Each of the color filters 540 may transmit only light of a specific color and block the transmission of the other colors of light by absorbing the other colors of light. The light passing through each of the color filters 540 may display one of the primary colors (e.g., the three primary colors such as red, green, and blue). However, the display color of the light passing through each of the color filters 540 is not limited to the primary colors and may also be any one of cyan, magenta, yellow, and white.

[0125] In the current embodiment, the first color conversion filter may be a first color filter (e.g., a red first color filter) 541, a second color filter (e.g., a green second color filter) 542, and a third color filter (e.g., a blue third color filter) 543.

[0126] The first color filter 541 may be disposed in the first color region LA11. The first color filter 541 may transmit light of the first color but block the light of the second color and the third color by absorbing the light of the second color and the third color. Here, the first color may be red, the second color may be green, and the third color may be blue. For example, the first color filter 541 may be a red color filter and may include a red colorant. The red color filter may transmit red light but block green light and blue light by absorbing green light and blue light.

[0127] The second color filter 542 may be disposed in the second color region LA12. The second color filter 542 may transmit light of the second color, but block light of the first color and the third color by absorbing light of the first color and the third color. For example, the second color filter 542 may be a green color filter and may include a green colorant. The green color filter may transmit green light, but block red light and blue light by absorbing red light and blue light.

[0128] The third color filter 543 may be disposed in the third color region LA13. The third color filter 543 may transmit light of the third color, but block light of the first color and the second color by absorbing light of the first color and the second color. For example, the third color filter 543 may be a blue color filter and may include a blue colorant. The blue color filter may transmit blue light, but block red light and green light by absorbing red light and green light.

[0129] Since the color filter 540 absorbs a considerable amount of external light, external light reflection can be reduced even without adding a polarizer or the like.

[0130] In an embodiment, the boundary portion between the color filters 540 may be located in the non-light emitting region NLA. That is, the boundary portion between the color filters 540 may overlap with the first black matrix 521.

[0131] The first cover layer 511 is disposed on the first color conversion filter. The first cover layer 511 may prevent or substantially prevent impurities (such as moisture and / or air) from being introduced from the outside and damaging and / or contaminating the color filter and the like. In addition, the first cover layer 511 may prevent or substantially prevent the colorant contained in each color filter from diffusing to other components.

[0132] In some embodiments, the first cover layer 511 may be made of an inorganic material. For example, the first cover layer 511 may include silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, and / or silicon oxynitride.

[0133] The first cover layer 511 may be formed by sputtering, ALD, and / or CVD.

[0134] The second color conversion filter and the light transmission pattern 533 are disposed on the first cover layer 511. The second color conversion filter may be a wavelength conversion pattern 530. Each of the wavelength conversion patterns 530 may convert the peak wavelength of incident light into another (e.g., specific) peak wavelength and output light having the other (e.g., specific) peak wavelength. The light passing through each of the wavelength conversion patterns 530 may exhibit one of the primary colors (e.g., the three primary colors such as red, green, and blue). However, the displayed color of the light passing through each of the wavelength conversion patterns 530 is not limited to the primary colors and may also be any one of cyan, magenta, yellow, and white.

[0135] In the present embodiment, the wavelength conversion pattern 530 includes a first wavelength conversion pattern 531 and a second wavelength conversion pattern 532 that are different from each other.

[0136] The first wavelength conversion pattern 531 may be disposed in the first color region LA11. In an exemplary embodiment, the first wavelength conversion pattern 531 may convert blue light into red light in the range of approximately 610 nm to approximately 650 nm and output red light. The first wavelength conversion pattern 531 may not be disposed in the second color region LA12 and the third color region LA13.

[0137] The first wavelength conversion pattern 531 may include a first matrix resin 5311 and a first wavelength conversion material 5313 dispersed in the first matrix resin 5311, and may also include a first scatterer 5315 dispersed in the first matrix resin 5311.

[0138] The first matrix resin 5311 may be any suitable material having a high light transmittance and suitable (e.g., excellent) dispersion characteristics for the first wavelength conversion material 5313 and the first scatterer 5315. For example, the first matrix resin 5311 may include an organic material such as an epoxy resin, an acrylic resin, a cardo resin, and / or an imide resin.

[0139] The first wavelength conversion material 5313 may convert the peak wavelength of incident light into another (e.g., specific) peak wavelength. Examples of the first wavelength conversion material 5313 may include quantum dots, quantum rods, and phosphors. For example, a quantum dot may be a particulate material that emits light of a specific color when an electron transitions (e.g., moves) from the conduction band to the valence band.

[0140] Quantum dots can be semiconductor nanocrystal materials. Quantum dots can have a specific bandgap depending on their composition and size. Thus, quantum dots can absorb light and then emit light with a unique wavelength. Examples of the semiconductor nanocrystals of quantum dots include Group IV nanocrystals, II-VI compound nanocrystals, III-V compound nanocrystals, IV-VI compound nanocrystals, and combinations thereof.

[0141] Group IV nanocrystals can be, but are not limited to, silicon (Si), germanium (Ge), and / or binary compounds such as silicon carbide (SiC) and / or silicon germanium (SiGe).

[0142] In addition, II-VI compound nanocrystals can be, but are not limited to, binary compounds (such as CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS, or combinations thereof), ternary compounds (such as CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS, or combinations thereof), and / or quaternary compounds (such as HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe, or combinations thereof).

[0143] In addition, III-V compound nanocrystals can be, but are not limited to, binary compounds (such as GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, or combinations thereof), ternary compounds (such as GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, or combinations thereof), and / or quaternary compounds (such as GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, or combinations thereof).

[0144] The group-IV-VI compound nanocrystals can be, but are not limited to, binary compounds (such as SnS, SnSe, SnTe, PbS, PbSe, PbTe, or combinations thereof), ternary compounds (such as SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, or combinations thereof), and / or quaternary compounds (such as SnPbSSe, SnPbSeTe, SnPbSTe, or combinations thereof).

[0145] The quantum dots can have a core-shell structure that includes a core containing the nanocrystals described above and a shell surrounding the core. The shell of the quantum dots can act as a protective layer for maintaining semiconductor properties by preventing or reducing chemical denaturation of the core, and / or as a charging layer for imparting electrophoretic properties to the quantum dots. The shell can be a single layer or multiple layers. Examples of the shell of the quantum dots include metal oxides or non-metal oxides, semiconductor compounds, and combinations thereof.

[0146] For example, the metal oxide or non-metal oxide can be, but is not limited to, binary compounds (such as SiO2, Al2O3, TiO2, ZnO, MnO, Mn2O3, Mn3O4, CuO, FeO, Fe2O3, Fe3O4, CoO, Co3O4, and / or NiO) and / or ternary compounds (such as MgAl2O4, CoFe2O4, NiFe2O4, and / or CoMn2O4).

[0147] In addition, the semiconductor compound can be, but is not limited to, CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, GaAs, GaP, GaSb, HgS, HgSe, HgTe, InAs, InP, InSb, AlAs, AlP, and / or AlSb.

[0148] The light emitted from the first wavelength conversion material 5313 can have a full width at half maximum (FWHM) of about 45 nm or less, about 40 nm or less, or about 30 nm or less. Accordingly, the color purity and color reproducibility of the display device can be improved. In addition, the light emitted from the first wavelength conversion material 5313 can be radiated in all directions regardless of the incident direction of the incident light. Accordingly, the lateral visibility of the display device can be improved.

[0149] A part of the light L emitted from the organic light-emitting diode 310 can be transmitted through the first wavelength conversion pattern 531 without being converted into red light by the first wavelength conversion material 5313. The component that is incident on the first color filter 541 and not converted by the first wavelength conversion pattern 531 (for example, a part of the light L) can be blocked by the first color filter 541. On the other hand, the red light output from the first wavelength conversion pattern 531 can be transmitted through the first color filter 541 to the outside. Therefore, the first light L1 output from the first color region LA11 can be red light.

[0150] The first scatterer 5315 can have a refractive index different from that of the first matrix resin 5311 and can form an optical interface with the first matrix resin 5311. For example, the first scatterer 5315 can be light-scattering particles. The first scatterer 5315 can be any suitable material that can scatter at least a part of the transmitted light. For example, the first scatterer 5315 can be metal oxide particles and / or organic particles. Examples of metal oxides include titanium oxide (TiO2), zirconium oxide (ZrO2), aluminum oxide (Al2O3), indium oxide (In2O3), zinc oxide (ZnO), and tin oxide (SnO2). Examples of organic particle materials include acrylic resin and polyurethane resin. The first scatterer 5315 can scatter the incident light in random directions regardless of the incident direction of the light, while basically not changing the wavelength of the light transmitted through the first wavelength conversion pattern 531. Therefore, the first scatterer 5315 can increase the path length of the light transmitted through the first wavelength conversion pattern 531 and increase the color conversion efficiency of the first wavelength conversion material 5313.

[0151] In some embodiments, the thickness of the first wavelength conversion pattern 531 can be 3 μm to 15 μm. The content (for example, weight percentage) of the first wavelength conversion material 5313 in the first wavelength conversion pattern 531 can be 10% to 60%. In addition, the content (for example, weight percentage) of the first scatterer 5315 in the first wavelength conversion pattern 531 can be 2% to 15%.

[0152] The second wavelength conversion pattern 532 can be disposed in the second color region LA12. In an exemplary embodiment, the second wavelength conversion pattern 532 can convert blue light into green light in the range of about 510 nm to about 550 nm and output green light. The second wavelength conversion pattern 532 can not be disposed in the first color region LA11 and the third color region LA13.

[0153] The second wavelength conversion pattern 532 can include a second matrix resin 5321 and a second wavelength conversion material 5323 dispersed in the second matrix resin 5321, and can also include a second scatterer 5325 dispersed in the second matrix resin 5321.

[0154] The second matrix resin 5321 can be any suitable material that has a high light transmittance and suitable (e.g., excellent) dispersion characteristics for the second wavelength conversion material 5323 and the second scatterer 5325. For example, the second matrix resin 5321 can include organic materials such as epoxy resins, acrylic resins, cardo resins, and / or imide resins.

[0155] Examples of the second wavelength conversion material 5323 can include quantum dots, quantum rods, and phosphors. Other details of the second wavelength conversion material 5323 are substantially the same as or similar to the details of the first wavelength conversion material 5313 described above, and thus a detailed description thereof is omitted.

[0156] The first wavelength conversion material 5313 and the second wavelength conversion material 5323 can both be composed of quantum dots. In this case, the diameter of the quantum dots constituting the first wavelength conversion material 5313 can be larger than the diameter of the quantum dots constituting the second wavelength conversion material 5323. For example, the quantum dot size of the first wavelength conversion material 5313 can be about to about In addition, the quantum dot size of the second wavelength conversion material 5323 can be about to about

[0157] The light passing through the first wavelength conversion pattern 531 and the second wavelength conversion pattern 532 can be in an unpolarized state by depolarization. As used herein, the term "unpolarized light" refers to light that is not composed of only polarization components in a specific direction, i.e., light that is not polarized only in a specific direction. In other words, the term "unpolarized light" refers to light composed of random polarization components. An example of unpolarized light is natural light.

[0158] The second scatterer 5325 can have a refractive index different from that of the second matrix resin 5321 and can form an optical interface with the second matrix resin 5321. For example, the second scatterer 5325 can be light-scattering particles. Other details of the second scatterer 5325 are substantially the same as or similar to the details of the first scatterer 5315 described above, and thus a detailed description thereof is omitted.

[0159] In some embodiments, the thickness of the second wavelength conversion pattern 532 can be 3 μm to 15 μm. The content (e.g., weight percentage) of the second wavelength conversion material 5323 in the second wavelength conversion pattern 532 can be 10% to 60%. In addition, the content (e.g., weight percentage) of the second scatterer 5325 in the second wavelength conversion pattern 532 can be 2% to 15%.

[0160] The light L emitted from the organic light-emitting diode 310 can be provided to the second wavelength conversion pattern 532, and the second wavelength conversion material 5323 can convert the light L emitted from the organic light-emitting diode 310 into green light and output the green light.

[0161] A part of the light L emitted from the organic light-emitting diode 310 can transmit through the second wavelength conversion pattern 532 without being converted into green light by the second wavelength conversion material 5323, and can be blocked by the second color filter 542. On the other hand, among the emitted light L, the green light output from the second wavelength conversion pattern 532 can transmit through the second color filter 542 to the outside. Therefore, the second light L2 output from the second color region LA12 can be green light.

[0162] The light transmission pattern 533 can be located in the third color region LA13 and can not be located in the first color region LA11 and the second color region LA12. The light transmission pattern 533 can transmit the incident light substantially as it is.

[0163] The light transmission pattern 533 can include a third matrix resin 5331 and a third scatterer 5335 dispersed in the third matrix resin 5331.

[0164] The third matrix resin 5331 can be made of an organic material having a high light transmittance. The third matrix resin 5331 can be made of the same material as the material of the first matrix resin 5311, or can include at least one of the materials mentioned as examples of the material of the first matrix resin 5311.

[0165] The third scatterer 5335 can have a refractive index different from that of the third matrix resin 5331 and can form an optical interface with the third matrix resin 5331. For example, the third scatterer 5335 can be light-scattering particles. The third scatterer 5335 can be any suitable material capable of scattering at least a part of the transmitted light. For example, the third scatterer 5335 can be metal oxide particles and / or organic particles. Examples of metal oxides include titanium oxide (TiO2), zirconium oxide (ZrO2), aluminum oxide (Al2O3), indium oxide (In2O3), zinc oxide (ZnO), and tin oxide (SnO2). Examples of organic particle materials include acrylic resin and polyurethane resin. The third scatterer 5335 can scatter the incident light in random directions regardless of the incident direction of the light while substantially not changing the wavelength of the light transmitted through the light transmission pattern 533. Therefore, the third scatterer 5335 can improve the lateral visibility of the light transmitted through the light transmission pattern 533.

[0166] The light L emitted from the organic light-emitting diode 310 is transmitted to the outside through the light-transmitting pattern 533 and the third color filter 543. That is, the third light L3 output from the third color region LA13 may have the same wavelength as the light L (e.g., the blue light emitted from the organic light-emitting diode 310).

[0167] The first wavelength conversion pattern 531, the second wavelength conversion pattern 532, and the light-transmitting pattern 533 may be separated from each other in a plan view. Accordingly, the respective materials of the first wavelength conversion pattern 531, the second wavelength conversion pattern 532, and the light-transmitting pattern 533 do not mix with each other. Spaces may be formed between the first wavelength conversion pattern 531, the second wavelength conversion pattern 532, and the light-transmitting pattern 533 that are separated from each other.

[0168] The second cover layer 512 may be disposed on the first wavelength conversion pattern 531, the second wavelength conversion pattern 532, and the light-transmitting pattern 533. The second cover layer 512 may cover the first wavelength conversion pattern 531, the second wavelength conversion pattern 532, and the light-transmitting pattern 533. The second cover layer 512 may include (e.g., cover) the spaces between the first wavelength conversion pattern 531, the second wavelength conversion pattern 532, and the light-transmitting pattern 533. In these spaces, the second cover layer 512 may be in direct contact with the first cover layer 511.

[0169] The second cover layer 512 together with the first cover layer 511 may seal the first wavelength conversion pattern 531, the second wavelength conversion pattern 532, and the light-transmitting pattern 533, thereby preventing or substantially preventing impurities (such as moisture and / or air) from being introduced from the outside and damaging and / or contaminating the first wavelength conversion pattern 531, the second wavelength conversion pattern 532, and the light-transmitting pattern 533.

[0170] The second cover layer 512 may be made of an inorganic material (e.g., an inorganic substance). The second cover layer 512 may be made of the same material as the material of the first cover layer 511, or may include at least one of the materials mentioned in the description of the first cover layer 511.

[0171] The thickness of the second cover layer 512 may be about or less. The second cover layer 512 may be, but is not limited to, a single layer. The second cover layer 512 may be formed by the same method as the method of the first cover layer 511, or may be formed by combining one of the methods illustrated for the first cover layer 511.

[0172] The second cover layer 512 may include a material having a tenth refractive index. For example, for light of about 560 nm, the tenth refractive index may have a range of about 1.4 to about 2.0.

[0173] The second black matrix 522 is disposed on the second cover layer 512. The second black matrix 522 may be disposed along the boundary of each of the color regions LA11, LA12, and LA13 and may block the transmission of light. The second black matrix 522 may be stacked with the pixel defining layer 330. The second black matrix 522 may be stacked with the space between the first wavelength conversion pattern 531, the second wavelength conversion pattern 532, and the light transmission pattern 533.

[0174] The second black matrix 522 may be made of any suitable material that can block light. The second black matrix 522 may be made of the same material as the first black matrix 521 or may include at least one of the materials mentioned in the description of the first black matrix 521.

[0175] The third cover layer 513 is disposed on the second cover layer 512 and the second black matrix 522. The third cover layer 513 may be stacked with the second cover layer 512 in the light emitting region and may be stacked with the second black matrix 522 in the non-light emitting region NLA.

[0176] The third cover layer 513 may be made of an inorganic material (e.g., an inorganic substance). The third cover layer 513 may be made of the same material as the first cover layer 511 or may include at least one of the materials mentioned in the description of the first cover layer 511.

[0177] The thickness of the third cover layer 513 may be about or less. The third cover layer 513 may be, but is not limited to, a single layer. The third cover layer 513 may be formed by the same method as the first cover layer 511 or may be formed by combining one of the methods illustrated for the first cover layer 511.

[0178] The third cover layer 513 may include a material having an eleventh refractive index. For example, for light of about 560 nm, the eleventh refractive index may have a range of about 1.55 to about 1.65. In an embodiment, the third cover layer 513 may be omitted.

[0179] The filling layer 70 is located between the third cover layer 513 and the sixth sub-inorganic layer 433. The filling layer 70 may include a material having a twelfth refractive index. For light of about 560 nm, the twelfth refractive index may have a range of about 1.4 to about 1.6. In an embodiment, the twelfth refractive index may be lower than the eleventh refractive index and the ninth refractive index. In this case, the filling layer 70 may be made of a material that is substantially sparser than the third cover layer 513 and the sixth sub-inorganic layer 433.

[0180] Figure 6 is Figure 5 a cross-sectional view of a modified example of the organic light emitting diode 310 shown in Figure 7 isFigure 5 Cross-sectional view of a modified example of the organic light-emitting diode 310 shown in

[0181] Refer to Figure 6 , the organic light-emitting layer 320_1 included in the organic light-emitting diode 310_1 may further include a first charge generation layer CGL11 located on the first light-emitting layer EL11 and a second light-emitting layer EL12 located on the first charge generation layer CGL11, and the first electron transport layer ETL1 may be located on the second light-emitting layer EL12.

[0182] The first charge generation layer CGL11 can inject charges into each adjacent light-emitting layer. The first charge generation layer CGL11 can adjust the charge balance between the first light-emitting layer EL11 and the second light-emitting layer EL12. In some embodiments, the first charge generation layer CGL11 may include an n-type charge generation layer and a p-type charge generation layer. The p-type charge generation layer may be disposed on the n-type charge generation layer.

[0183] Similar to the first light-emitting layer EL11, the second light-emitting layer EL12 may but does not have to emit blue light. The second light-emitting layer EL12 may emit blue light having a peak wavelength the same as or different from the peak wavelength of the blue light emitted from the first light-emitting layer EL11. In an embodiment, the first light-emitting layer EL11 and the second light-emitting layer EL12 may emit lights of different colors. That is, when the first light-emitting layer EL11 emits blue light, the second light-emitting layer EL12 may emit green light.

[0184] Since the organic light-emitting layer 320_1 constructed as described above includes two light-emitting layers, it may have better luminous efficiency and a longer lifespan (e.g., service life) than Figure 5 the structure.

[0185] Figure 7 It is shown that the organic light-emitting layer 320_2 included in the organic light-emitting diode 310_2 may include three light-emitting layers EL11, EL12, and EL13 and two charge generation layers CGL11 and CGL12 disposed between the three light-emitting layers EL11, EL12, and EL13. Refer to Figure 7 , the organic light-emitting layer 320_2 may further include a first charge generation layer CGL11 located on the first light-emitting layer EL11, a second light-emitting layer EL12 located on the first charge generation layer CGL11, a second charge generation layer CGL12 located on the second light-emitting layer EL12, and a third light-emitting layer EL13 located on the second charge generation layer CGL12. The first electron transport layer ETL1 may be located on the third light-emitting layer EL13.

[0186] Similar to the first light-emitting layer EL11 and the second light-emitting layer EL12, the third light-emitting layer EL13 can emit blue light. In an embodiment, each of the first light-emitting layer EL11, the second light-emitting layer EL12, and the third light-emitting layer EL13 can emit blue light. Here, the peak wavelengths of the blue light emitted from the first light-emitting layer EL11 to the third light-emitting layer EL13 can be exactly the same, or some of the peak wavelengths can be different. In an embodiment, the first light-emitting layer EL11, the second light-emitting layer EL12, and the third light-emitting layer EL13 can emit light of different colors. For example, each light-emitting layer can emit blue light or green light. Alternatively, the light-emitting layers can emit red light, green light, and blue light respectively, thus providing white light as a whole.

[0187] Now, reference will be made to Figure 8 and Figure 9 to describe in more detail the path of the light emitted from the organic light-emitting diode 310.

[0188] Figure 8 is a schematic cross-sectional view showing the optical path between the second interlayer insulating layer 350 and the second cover layer 512 in an embodiment of Figure 4 the optical path between the second interlayer insulating layer 350 and the second cover layer 512 in an embodiment of Figure 9 is a schematic cross-sectional view showing the optical path in another OLED as a comparative example of Figure 8 the optical path in another OLED as a comparative example of Figure 8 and Figure 9 show a cross-section of any one of the color regions (e.g., any one of the color regions). In Figure 8 and Figure 9 the thickness of each element is exaggerated for ease of description.

[0189] Different from the embodiment of Figure 8 the OLED of Figure 9 does not include the first sub-inorganic layer 411, the third sub-inorganic layer 413, the fourth sub-inorganic layer 431, the sixth sub-inorganic layer 433, and the third cover layer 513.

[0190] As described above, the light emitted from the organic light-emitting diode 310 on the first substrate 10 can travel toward the second substrate 30. In Figure 8 and Figure 9 between the organic light-emitting diode 310 and the second interlayer insulating layer 350, the emitted light L includes a first emitted light La having an incident angle of 0 degrees (θa) and a refraction angle of 0 degrees (θa'), a second emitted light Lb having an incident angle of a first angle θb and a refraction angle of a second angle θb', and a third emitted light Lc having an incident angle of a third angle θc and a refraction angle of a fourth angle θc'. Here, the first angle θb, the second angle θb', the third angle θc, and the fourth angle θc' are acute angles. The third angle θc is greater than the first angle θb.

[0191] Refer toFigure 8 , the light La, Lb, and Lc emitted from the organic light-emitting diode 310 of the OLED1 according to the current embodiment can sequentially pass through the second interlayer insulating layer 350, the first sub-inorganic layer 411, the second sub-inorganic layer 412, the third sub-inorganic layer 413, the organic layer 420, the fourth sub-inorganic layer 431, the fifth sub-inorganic layer 432, the sixth sub-inorganic layer 433, the filling layer 70, the third cover layer 513, and the second cover layer 512 to reach the second color conversion filter or the light transmission pattern 533.

[0192] Refer to Figure 9 , the light La', Lb', and Lc' emitted from the organic light-emitting diode 310 of the OLED according to the comparative embodiment can sequentially pass through the second interlayer insulating layer 350, the second sub-inorganic layer 412, the organic layer 420, the fifth sub-inorganic layer 432, the filling layer 70, and the second cover layer 512 to reach the second color conversion filter or the light transmission pattern 533.

[0193] First, the emitted light La, Lb, and Lc will be described in more detail. Figure 8

[0194] The first light La can sequentially pass through multiple layers from the second interlayer insulating layer 350 to the second cover layer 512 without being refracted, and then reach the wavelength conversion pattern 530 or the light transmission pattern 533.

[0195] At the boundary surface between the second interlayer insulating layer 350 and the first sub-inorganic layer 411 and the second sub-inorganic layer 412, the refraction angle of each of the second emitted light Lb and the third emitted light Lc can become larger than the incident angle, and the first sub-inorganic layer 411 and the second sub-inorganic layer 412 are materials less dense than the material of the second interlayer insulating layer 350. At the boundary surface between the first sub-inorganic layer 411 and the second sub-inorganic layer 412 and the third sub-inorganic layer 413, the refraction angle of each of the second emitted light Lb and the third emitted light Lc can become smaller than the incident angle, and the third sub-inorganic layer 413 is a material denser than the materials of the first sub-inorganic layer 411 and the second sub-inorganic layer 412. At the boundary surface between the third sub-inorganic layer 413 and the organic layer 420, the refraction angle of each of the second emitted light Lb and the third emitted light Lc can become larger than the incident angle, and the organic layer 420 is a material less dense than the material of the third sub-inorganic layer 413. At the boundary surface between the organic layer 420 and the fourth sub-inorganic layer 431 and the fifth sub-inorganic layer 432, the refraction angle of each of the second emitted light Lb and the third emitted light Lc can become smaller than the incident angle, and the fourth sub-inorganic layer 431 and the fifth sub-inorganic layer 432 are materials denser than the material of the organic layer 420. At the boundary surface between the fourth sub-inorganic layer 431 and the fifth sub-inorganic layer 432 and the sixth sub-inorganic layer 433, the refraction angle of each of the second emitted light Lb and the third emitted light Lc can become smaller than the incident angle, and the sixth sub-inorganic layer 433 is a material denser than the materials of the fourth sub-inorganic layer 431 and the fifth sub-inorganic layer 432. At the boundary surface between the sixth sub-inorganic layer 433 and the filling layer 70, the refraction angle of each of the second emitted light Lb and the third emitted light Lc can become larger than the incident angle, and the filling layer 70 is a material less dense than the material of the sixth sub-inorganic layer 433. At the boundary surface between the filling layer 70 and the third cover layer 513 and the second cover layer 512, the refraction angle of each of the second emitted light Lb and the third emitted light Lc can become smaller than the incident angle, and the third cover layer 513 and the second cover layer 512 are materials denser than the material of the filling layer 70. In this way, the second emitted light Lb and the third emitted light Lc can all reach the wavelength conversion pattern 530 or the light transmission pattern 533.

[0196] Next, the emitted light La', Lb', and Lc' will be described. Figure 9 of the emitted light La', Lb', and Lc'.

[0197] As in Figure 8 the OLED1 of Figure 9 the second emitted light Lb' from the organic light emitting diode 310 of

[0198] On the other hand, the third emitted light Lc' does not reach the wavelength conversion pattern 530 or the light transmission pattern 533. Because from Figure 9The OLED omits the third sub-inorganic layer 413 and the sixth sub-inorganic layer 433, which are materials relatively denser than the materials of the components disposed under the third sub-inorganic layer 413 and the sixth sub-inorganic layer 433. Therefore, compared with Figure 8 the OLED1, the portion where the refraction angle becomes smaller than the incident angle is reduced. Thus, in the emitted light, compared with the light L in Figure 8 the OLED1, in Figure 9 the OLED, more (e.g., a larger portion) of the light L does not reach the wavelength conversion pattern 530 or the light transmission pattern 533.

[0199] The OLED1 can reduce light loss by disposing a relatively dense material in the direction in which the emitted light L travels.

[0200] According to an embodiment of the present disclosure, the relationship between the interfacial refractive index difference (e.g., the refractive index difference between the layers forming the interface) and light loss will now be described in more detail using Figures 10 to 15 experimental examples.

[0201] Figure 10 FIG. is a schematic cross-sectional view of a part of an OLED according to a first experimental example. Figure 11 FIG. is a schematic cross-sectional view of a part of an OLED according to a second experimental example. Figure 12 FIG. is a schematic cross-sectional view of a part of an OLED according to a third experimental example. Figure 13 FIG. is a schematic cross-sectional view of a part of an OLED according to a fourth experimental example. Figure 14 FIG. is a schematic cross-sectional view of a part of an OLED according to a fifth experimental example. Figure 15 FIG. is a schematic cross-sectional view of a part of an OLED according to a sixth experimental example.

[0202] Referring to Figures 10 to 15 , the OLEDs according to the experimental examples are different from Figure 4 the OLED1 in the structure of the encapsulation layers 400_1, 400_2, 400_3, 400_4, 400_5, and 400_6. Here, each of the encapsulation layers 400_1, 400_2, 400_3, 400_4, 400_5, and 400_6 is disposed between the second interlayer insulating layer 350 (or the organic light-emitting diode 310) and the filling layer 70.

[0203] The encapsulation layer 400_1 of the first experimental example may have a structure in which a second sub-inorganic layer 412 (e.g., 412_1), a third sub-inorganic layer 413 (e.g., 413_1), an organic layer 420 (e.g., 420_1), and a fifth sub-inorganic layer 432 (e.g., 432_1) are sequentially stacked therein.

[0204] The encapsulation layer 400_2 of the second experimental example may have a structure in which a second sub-inorganic layer 412 (e.g., 412_2), a third sub-inorganic layer 413 (e.g., 413_1), an organic layer 420 (e.g., 420_1), and a fifth sub-inorganic layer 432 (e.g., 432_2) are sequentially stacked.

[0205] The encapsulation layer 400_3 of the third experimental example may have a structure in which a second sub-inorganic layer 412 (e.g., 412_2), a third sub-inorganic layer 413 (e.g., 413_1), an organic layer 420 (e.g., 420_1), a fifth sub-inorganic layer 432 (e.g., 432_2), and a sixth sub-inorganic layer 433 (e.g., 433_1) are sequentially stacked.

[0206] The encapsulation layer 400_4 of the fourth experimental example may have a structure in which a second sub-inorganic layer 412 (e.g., 412_2), a third sub-inorganic layer 413 (e.g., 413_2), an organic layer 420 (e.g., 420_1), a fifth sub-inorganic layer 432 (e.g., 432_2), and a sixth sub-inorganic layer 433 (e.g., 433_2) are sequentially stacked.

[0207] The encapsulation layer 400_5 of the fifth experimental example may have a structure in which a second sub-inorganic layer 412 (e.g., 412_2), a third sub-inorganic layer 413 (e.g., 413_3), an organic layer 420 (e.g., 420_1), a fifth sub-inorganic layer 432 (e.g., 432_2), and a sixth sub-inorganic layer 433 (e.g., 433_3) are sequentially stacked.

[0208] The encapsulation layer 400_6 of the sixth experimental example may have a structure in which a second sub-inorganic layer 412 (e.g., 412_2), a third sub-inorganic layer 413 (e.g., 413_1), an organic layer 420 (e.g., 420_1), and a fifth sub-inorganic layer 432 (e.g., 432_3) are sequentially stacked. The thickness and refractive index of each element in each of the encapsulation layers 400_1, 400_2, 400_3, 400_4, 400_5, and 400_6 according to the first experimental example, the second experimental example, the third experimental example, the fourth experimental example, the fifth experimental example, and the sixth experimental example are as shown in Table 1 below.

[0209] Table 1

[0210]

[0211]

[0212] The front light efficiency of the OLED of the first experimental example is reduced by approximately 6% compared to the front light efficiency of the OLED of the second experimental example. The front light efficiency of the OLED of the third experimental example is increased by approximately 4% compared to the front light efficiency of the OLED of the second experimental example. The front light efficiency of the OLED of the fourth experimental example is increased by approximately 1% compared to the front light efficiency of the OLED of the second experimental example. The front light efficiency of the OLED of the fifth experimental example is reduced by approximately 1% compared to the front light efficiency of the OLED of the second experimental example. The front light efficiency of the OLED of the sixth experimental example is reduced by approximately 2% compared to the front light efficiency of the OLED of the second experimental example.

[0213] By comparing the first experimental example and the second experimental example, it can be seen that as the refractive index difference between the second sub-inorganic layer 412 and the third sub-inorganic layer 413 and the refractive index difference between the organic layer 420 and the fifth sub-inorganic layer 432 decrease, the front light efficiency increases. In some embodiments, the refractive index difference between the second sub-inorganic layer 412 and the third sub-inorganic layer 413 may be 0.09 or less. Additionally, in some embodiments, the refractive index difference between the organic layer 420 and the fifth sub-inorganic layer 432 may be 0.14 or less.

[0214] By comparing the second experimental example and the third experimental example, it can be seen that as the refractive index difference at the interface between the filling layer 70 and the encapsulation layer 400 decreases, the front light efficiency increases. Here, since the filling layer 70 is formed of a material that is less dense than the material of the encapsulation layer 400, the third experimental example has a smaller refractive index difference at the interface between the filling layer 70 and the sixth sub-inorganic layer 433_1 compared to the second experimental example, and the second experimental example has a larger refractive index difference at the interface between the filling layer 70 and the fifth sub-inorganic layer 432_2.

[0215] By comparing the third experimental example, the fourth experimental example, and the fifth experimental example, it can be seen that when the refractive indices at the interfaces are the same, the desired thickness (e.g., the optimal thickness) of each of the third sub-inorganic layer 413 and the sixth sub-inorganic layer 433 is approximately 0.1 μm. In some embodiments, the thickness of the third sub-inorganic layer 413 and / or the sixth sub-inorganic layer 433 may be approximately 0.1 μm.

[0216] Next, an OLED according to an additional embodiment will be described. Elements that are the same as those Figures 1 to 15 described will be denoted by the same reference numerals, and their detailed descriptions will not be repeated.

[0217] Figure 16 is a cross-sectional view of an OLED2 according to an embodiment.

[0218] Referring to Figure 16 According to the present embodiment, the OLED2 is the same as Figure 4The difference from the OLED1 is that the second black matrix 522 is omitted.

[0219] The second substrate 30 may include a second color conversion filter and a light transmission pattern 533 disposed on the first cover layer 511. The second cover layer 512 and the third cover layer 513 may be disposed on the second color conversion filter and the light transmission pattern 533. The second cover layer 512 and the third cover layer 513 may be in direct contact with each other without any element disposed between the second cover layer 512 and the third cover layer 513.

[0220] Figure 17 is a cross-sectional view of an OLED3 according to an embodiment.

[0221] Referring to Figure 17 According to the present embodiment, the OLED3 is different from the Figure 4 OLED1 in that the first sub-inorganic layer 411 and the fourth sub-inorganic layer 431 of the encapsulation layer 400 and the third cover layer 513 are omitted.

[0222] The encapsulation layer 400_7 may include a second sub-inorganic layer 412 disposed on the second interlayer insulating layer 350, a third sub-inorganic layer 413 disposed on the second sub-inorganic layer 412, an organic layer 420 disposed on the third sub-inorganic layer 413, a fifth sub-inorganic layer 432 disposed on the organic layer 420, and a sixth sub-inorganic layer 433 disposed on the fifth sub-inorganic layer 432. The encapsulation layer 400_7 may be relatively thinner than the Figure 4 encapsulation layer 400 of the embodiment. Therefore, the total thickness of the OLED3 can be reduced.

[0223] The second black matrix 522 may be disposed on the second cover layer 512. The second substrate 30 and the filling layer 70 may be in contact with each other, and a part of the second cover layer 512 of the second substrate 30 and the second black matrix 522 may be in contact with the filling layer 70. Different from the Figure 4 embodiment, the third cover layer 513 may be omitted, so that the total thickness of the OLED3 is relatively small.

[0224] Figure 18 is a cross-sectional view of an OLED4 according to an embodiment.

[0225] Referring to Figure 18 According to the present embodiment, the OLED4 is different from the Figure 17 OLED3 in that it further includes a third cover layer 513.

[0226] In the second substrate 30, the second black matrix 522 may be disposed on the second cover layer 512, and the third cover layer 513 may be disposed on the second cover layer 512 and the second black matrix 522. The third cover layer 513 of the second substrate 30 may be in contact with the filling layer 70.

[0227] According to an embodiment, the amount of light extracted at the front can be increased by adjusting the interfacial refractive index difference between elements of the OLED. Accordingly, the brightness of the OLED can be improved.

[0228] In addition, the color conversion efficiency can be increased by using the color conversion layer of the OLED according to an embodiment of the present disclosure.

[0229] However, the effects of the embodiments are not limited to the effects of the embodiments set forth herein. By referring to the claims and their equivalents, the above and other effects of the embodiments will become more apparent to those of ordinary skill in the art to which the embodiments pertain.

[0230] Expressions such as “at least one of...” or “at least one selected from...” when following a list of elements modify the entire list of elements and not a single element in the list. In addition, when describing embodiments of the present invention, the use of “may” refers to “one or more embodiments in the present invention”. Further, the term “exemplary” is intended to indicate an example or illustration.

[0231] As used herein, the terms “substantially,” “about,” and similar terms are used as terms of approximation and not of degree, and are intended to account for inherent deviations that would be recognized by one of ordinary skill in the art in measured or calculated values. In addition, any numerical range recited herein is intended to include all sub-ranges having the same numerical precision within the recited range. For example, a range of “1.0 to 10.0” is intended to include all sub-ranges between the recited minimum value of 1.0 and the recited maximum value of 10.0 (and including 1.0 and 10.0), that is, having a minimum value equal to or greater than 1.0 and a maximum value equal to or less than 10.0 (such as, for example, 2.4 to 7.6). Any maximum numerical limitation recited herein is intended to include all lower numerical limitations contained therein, and any minimum numerical limitation recited in this specification is intended to include all higher numerical limitations contained therein. Accordingly, the applicant reserves the right to modify this specification (including the claims) to expressly recite any sub-ranges that are inherently described herein. All such ranges are intended to be inherently described in this specification such that modification to expressly recite any such sub-ranges is made.

[0232] Although the exemplary embodiments of the present disclosure have been described with reference to the drawings, those skilled in the art to which the present disclosure pertains will understand that the subject matter of the present disclosure can be implemented in other (e.g., detailed) forms without changing the technical spirit and essential features of the present disclosure. Accordingly, the above-described exemplary embodiments of the present disclosure are exemplary in all respects and should not be construed as restrictive.

Claims

1. An organic light emitting display, the organic light emitting display comprising: A first substrate; A plurality of organic light emitting diodes located on the first substrate; A encapsulation layer located on the plurality of organic light emitting diodes; And A plurality of first color conversion filters located on the encapsulation layer, Wherein, the encapsulation layer comprises: A first sub-inorganic layer located on the plurality of organic light emitting diodes; A second sub-inorganic layer located on the first sub-inorganic layer and having a refractive index greater than that of the first sub-inorganic layer; An organic layer located on the second sub-inorganic layer; and A third sub-inorganic layer located on the organic layer, Wherein, the refractive index of the second sub-inorganic layer is 1.5 to 1.57, and Wherein, the thickness of the first sub-inorganic layer is 5000 Å or greater.

2. The organic light emitting display according to claim 1, wherein, The difference between the refractive index of the first sub-inorganic layer and the refractive index of the second sub-inorganic layer is 0.09 or less.

3. The organic light emitting display according to claim 1, wherein The thickness of the second sub-inorganic layer is 3000 Å or less.

4. The organic light-emitting display according to claim 1, wherein the organic light-emitting display further includes an interlayer insulating layer located between the plurality of organic light-emitting diodes and the encapsulation layer, where The interlayer insulating layer comprises an inorganic material.

5. The organic light emitting display according to claim 4, wherein, The interlayer insulating layer has a refractive index of 1.4 to 2.5 and a thickness of 1000 Å or less.

6. The organic light emitting display according to claim 1, wherein, The first color conversion filter comprises quantum dots.

7. The organic light emitting display according to claim 1, wherein the organic light emitting display further includes a first cover layer and a second cover layer located between the encapsulation layer and the plurality of first color conversion filters, wherein, The thickness of each of the first cover layer and the second cover layer is 5000 Å or less.

8. The organic light emitting display according to claim 7, wherein, The refractive index of the first cover layer is 1.55 to 1.65, the refractive index of the second cover layer is 1.4 to 2.0, and the second cover layer is in direct contact with the plurality of first color conversion filters.

9. The organic light emitting display according to claim 1, Among them, The encapsulation layer further comprises a fourth sub-inorganic layer located on the third sub-inorganic layer, and Wherein, the refractive index of the fourth sub-inorganic layer is greater than that of the third sub-inorganic layer.

10. The organic light emitting display according to claim 9, wherein, The refractive index of the fourth sub-inorganic layer is 1.55 to 1.65, and the thickness of the fourth sub-inorganic layer is 3000 Å or less.

11. The organic light emitting display according to claim 1, wherein, The encapsulation layer further comprises: A fifth sub-inorganic layer located between the plurality of organic light emitting diodes and the first sub-inorganic layer; and A sixth sub-inorganic layer located between the organic layer and the third sub-inorganic layer.

12. The organic light-emitting display according to claim 11, wherein, The thickness of each of the fifth sub-inorganic layer and the sixth sub-inorganic layer is 3000 Å or less.

13. The organic light emitting display according to claim 1, wherein, Each of the plurality of organic light emitting diodes comprises: A first electrode located on the first substrate; A second electrode located on the first electrode; and A plurality of light emitting layers located between the first electrode and the second electrode.

14. The organic light emitting display according to claim 1, the organic light emitting display further comprising: A third cover layer located on the plurality of first color conversion filters; And A plurality of second color conversion filters located on the third cover layer.

15. The organic light emitting display according to claim 14, wherein, Each of the plurality of first color conversion filters is a wavelength conversion pattern, and each of the plurality of second color conversion filters is a color filter.

16. An organic light emitting display in which a non-light emitting area and a plurality of color areas are defined, the organic light emitting display comprising: A plurality of organic light-emitting diodes, located in the plurality of color regions; A encapsulation layer, located on the plurality of organic light-emitting diodes; And A wavelength conversion pattern, located on the encapsulation layer and in at least one of the plurality of color regions, Wherein, the encapsulation layer includes: A first inorganic layer, located on the plurality of organic light-emitting diodes; An organic layer, located on the first inorganic layer; and A second inorganic layer, located on the organic layer, Wherein, the first inorganic layer includes a first sub-inorganic layer and a second sub-inorganic layer, the second sub-inorganic layer has a refractive index greater than that of the first sub-inorganic layer, and the second inorganic layer includes a third sub-inorganic layer and a fourth sub-inorganic layer, the fourth sub-inorganic layer has a refractive index greater than that of the third sub-inorganic layer, Wherein, the refractive index of the second sub-inorganic layer is 1.5 to 1.57, and Wherein, the thickness of the first sub-inorganic layer is 5000 Å or greater.

17. The organic light emitting display according to claim 16, wherein, The plurality of color regions include a first color region, a second color region, and a third color region, the first color region, the second color region, and the third color region are used to emit light of different colors, and the plurality of organic light-emitting diodes are respectively located in the first color region, the second color region, and the third color region.

18. The organic light emitting display according to claim 17, wherein, The plurality of organic light-emitting diodes are used to emit light of the same color.

19. The organic light emitting display according to claim 18, wherein, The first color region is used to output red light, the second color region is used to output green light, the third color region is used to output blue light, and each of the plurality of organic light-emitting diodes is used to emit blue light.

20. The organic light-emitting display according to claim 16, wherein the organic light-emitting display further includes a filling layer located between the encapsulation layer and the wavelength conversion pattern.

21. The organic light emitting display according to claim 20, wherein, The filling layer includes an inert gas.

22. The organic light-emitting display according to claim 20, wherein the organic light-emitting display further includes a first cover layer and a second cover layer located between the wavelength conversion pattern and the filling layer, and each of the first cover layer and the second cover layer has a refractive index greater than that of the filling layer.

23. The organic light emitting display according to claim 16, wherein, The encapsulation layer includes the first sub-inorganic layer, the second sub-inorganic layer, the organic layer, the third sub-inorganic layer, and the fourth sub-inorganic layer arranged in sequence.

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