Display device

Abstract

A display device includes: first to third light emitting elements; a sub-pixel defining layer in which first to third openings are defined, the first to third openings overlapping the first to third light emitting elements, respectively; the packaging layer is arranged on the sub-pixel limiting layer; a functional layer disposed on the encapsulation layer and including a first quantum dot layer corresponding to the first light emitting element and a second quantum dot layer corresponding to the second light emitting element; and a color filter layer including a first color filter, a second color filter, and a third color filter, in which in a plan view, the second quantum dot layer includes a first portion overlapping the second opening and a second portion extending from the first portion in a direction toward the first opening, the second portion being adjacent to the first quantum dot layer.

Description

[0001] This application claims priority from and all benefits derived from Korean Patent Application No. 10-2024-0017619, filed on February 5, 2024, the contents of which are incorporated by reference in their entirety. Technical Field

[0002] One or more embodiments relate to a display device. Background Art

[0003] With the rapid development of the display field in which various electric signal information is visually presented, various display devices having excellent characteristics such as reduced thickness, reduced weight, and low power consumption have been introduced.

[0004] The display device may include a liquid crystal display device that uses light from a backlight unit without emitting light itself or a light-emitting display device that includes a display element capable of emitting light. The light-emitting display device may include a display element including an emission layer. Summary of the Invention

[0005] One or more embodiments include a display device having excellent color purity and excellent light efficiency. However, this aspect is merely an example, and the scope of one or more embodiments is not limited thereto.

[0006] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the presented embodiments of the disclosure.

[0007] According to one or more embodiments, a display device includes: a first substrate; first to third light-emitting elements, which are arranged on the first substrate; a sub-pixel defining layer, which defines first to third openings in the sub-pixel defining layer, and in a plan view, the first to third openings overlap with the first to third light-emitting elements, respectively; an encapsulation layer, which is arranged on the sub-pixel defining layer and includes at least one inorganic encapsulation layer and at least one organic encapsulation layer; a functional layer, which is arranged on the encapsulation layer, the functional layer including a first quantum dot layer corresponding to the first light-emitting element and a second quantum dot layer corresponding to the second light-emitting element; and a color filter layer, which is arranged in the direction of light output from the first to third light-emitting elements, the color filter layer including a first color filter corresponding to the first light-emitting element, a second color filter corresponding to the second light-emitting element, and a third color filter corresponding to the third light-emitting element, wherein, in a plan view, the second quantum dot layer includes a first portion overlapping with the second opening and a second portion extending from the first portion in a direction from the second opening to the first opening, and the second portion is adjacent to the first quantum dot layer.

[0008] The display device may further include a first embankment layer, which is arranged between the sub-pixel defining layer and the encapsulation layer, and defines 1-1 embankment openings to 1-3 embankment openings that overlap with the first light-emitting element to the third light-emitting element in a plan view, respectively, in the first embankment layer, wherein the first embankment layer may include a light-shielding material, and the second portion of the second quantum dot layer may overlap with the 1-1 embankment opening in a plan view.

[0009] The display device may further include: a second substrate arranged to face the first substrate; a low-refractive layer arranged to cover the color filter layer, the color filter layer being provided on a surface of the second substrate; and a filler provided between the low-refractive layer and the functional layer.

[0010] A second portion of the second quantum dot layer may overlap the first opening in a plan view.

[0011] The color filter layer may further include a fourth color filter, which overlaps with the second portion of the second quantum dot layer in a plan view, the second color filter may overlap with the first portion of the second quantum dot layer in a plan view, and the fourth color filter may include a composition different from the composition of the second color filter.

[0012] The second color filter may include a first color filter portion overlapping with a first portion of the second quantum dot layer in a plan view and a second color filter portion overlapping with a second portion of the second quantum dot layer, the second color filter portion may contain the same composition as the first color filter portion, and the thickness of the second color filter portion may be greater than the thickness of the first color filter portion.

[0013] The first color filter may overlap with the second portion of the second quantum dot layer in a plan view.

[0014] The display device may further include a light filter layer disposed on the entire color filter layer.

[0015] The second portion of the second quantum dot layer may not overlap with the first opening in a plan view.

[0016] At least two selected from the first color filter, the second color filter, and the third color filter may overlap each other in a specific portion, and the specific portion may define a light-shielding portion, and a second portion of the second quantum dot layer may overlap the light-shielding portion in a plan view.

[0017] The first to third light emitting elements may include an emission layer of a first color and an emission layer of a second color.

[0018] According to one or more embodiments, a display device includes: a first substrate; first to third light-emitting elements, which are arranged on the first substrate; a sub-pixel defining layer, which defines first to third openings in the sub-pixel defining layer, and in a plan view, the first to third openings overlap with the first to third light-emitting elements, respectively; a first embankment layer, which is arranged on the sub-pixel defining layer and defines 1-1 embankment openings to 1-3 embankment openings in the first embankment layer, which overlap with the first to third light-emitting elements, respectively, in a plan view; an encapsulation layer, which is arranged on the first embankment layer and includes at least one inorganic encapsulation layer and at least one organic encapsulation layer; a functional layer, which is arranged on the encapsulation layer, the functional layer including a first quantum dot layer corresponding to the first light-emitting element and a second quantum dot layer corresponding to the second light-emitting element; and a color filter layer, which is arranged in the direction of light output from the first to third light-emitting elements, the color filter layer including a first color filter corresponding to the first light-emitting element, a second color filter corresponding to the second light-emitting element, and a third color filter corresponding to the third light-emitting element, wherein the second quantum dot layer overlaps with the 1-1 embankment opening in a plan view.

[0019] The first bank layer may include a light-shielding material.

[0020] In a plan view, the second quantum dot layer may include a first portion overlapping the second opening and a second portion extending from the first portion in a direction from the second opening toward the first opening, and the second portion may be adjacent to the first quantum dot layer.

[0021] A second portion of the second quantum dot layer may overlap the first opening in a plan view.

[0022] The color filter layer may further include a fourth color filter, which overlaps with the second portion of the second quantum dot layer in a plan view, the second color filter may overlap with the first portion of the second quantum dot layer in a plan view, and the fourth color filter may contain a composition different from that of the second color filter.

[0023] The second color filter may include a first color filter portion overlapping with a first portion of the second quantum dot layer in a plan view and a second color filter portion overlapping with a second portion of the second quantum dot layer, the second color filter portion may contain the same composition as the first color filter portion, and the thickness of the second color filter portion may be greater than the thickness of the first color filter portion.

[0024] The first color filter may overlap with the second portion of the second quantum dot layer in a plan view.

[0025] The second portion of the second quantum dot layer may not overlap with the first opening in a plan view.

[0026] At least two selected from the first color filter, the second color filter, and the third color filter may overlap each other in a specific portion, and the specific portion may define a light-shielding portion, and a second portion of the second quantum dot layer may overlap the light-shielding portion in a plan view. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0028] Figure 1 is a perspective view schematically illustrating a display device according to an embodiment;

[0029] Figure 2 is a cross-sectional view schematically illustrating a sub-pixel of a display device according to an embodiment;

[0030] Figure 3 Show Figure 2 each of the optical layers of the functional layer;

[0031] Figures 4A to 4E is a cross-sectional view illustrating the structure of a light emitting element according to an embodiment;

[0032] Figure 5 is an equivalent circuit diagram illustrating a light emitting element included in a display device according to an embodiment and a sub-pixel circuit electrically connected to the light emitting element;

[0033] Figure 6 is a cross-sectional view schematically illustrating a display device according to an embodiment;

[0034] Figure 7 is a cross-sectional view schematically illustrating a display device according to another embodiment;

[0035] Figure 8A and Figure 8B is a plan view schematically illustrating a portion of a display device according to an embodiment;

[0036] Figure 9 is a cross-sectional view schematically illustrating a portion of a display device according to an embodiment;

[0037] Figure 10 It shows Figure 9 a graph of light transmittance spectra of a first color filter portion and a second color filter portion of a second color filter;

[0038] Figure 11 is a cross-sectional view schematically illustrating a portion of a display device according to an embodiment;

[0039] Figure 12 It shows Figure 11a graph of transmittance spectra of the second color filter and the fourth color filter;

[0040] Figure 13A and Figure 13B is a plan view schematically illustrating a portion of a display device according to an embodiment;

[0041] Figure 14 is a cross-sectional view schematically illustrating a portion of a display device according to an embodiment;

[0042] Figure 15 It shows Figure 14 The first color filter and Figure 9 a graph of a transmittance spectrum of a first color filter;

[0043] Figure 16 is a cross-sectional view schematically illustrating a portion of a display device according to an embodiment;

[0044] Figure 17A and Figure 17B is a plan view schematically illustrating a portion of a display device according to an embodiment;

[0045] Figure 18 is a cross-sectional view schematically illustrating a portion of a display device according to an embodiment; and

[0046] Figure 19 is a graph schematically illustrating a color space of a display device according to an embodiment and a Digital Cinema Initiative (DCI) color space. DETAILED DESCRIPTION

[0047] Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings, wherein the same reference numerals refer to the same elements throughout. In this regard, the present embodiments may have different forms and should not be construed as being limited to the description set forth herein. Accordingly, embodiments are described below only with reference to the figures to illustrate aspects of this specification. As used in this article, the term "and / or" includes any and all combinations of one or more of the associated listed items. Throughout this disclosure, the expression "at least one of a, b, and c" indicates only a, only b, only c, both a and b, both a and c, both b and c, all of a, b, and c, or variations thereof.

[0048] Because the present disclosure allows for various changes and numerous embodiments, certain embodiments will be illustrated in the accompanying drawings and described in detail in the written description. Hereinafter, the effects and features of the present disclosure and methods for achieving them will be more fully described with reference to the accompanying drawings in which embodiments of the present disclosure are shown. However, the present disclosure can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein.

[0049] Hereinafter, embodiments will be described with reference to the accompanying drawings, wherein like reference numerals refer to like elements throughout and repeated descriptions thereof will be omitted.

[0050] It will be understood that although terms such as “first” and “second” may be used herein to describe various elements, these elements should not be limited by these terms and these terms are only used to distinguish one element from another.

[0051] In the following embodiments, expressions used in the singular include expressions in the plural unless they have obviously different meanings in the context.

[0052] In the following embodiments, it will be further understood that the terms “include” and / or “comprises” used herein specify the presence of stated features or elements, but do not preclude the presence or addition of one or more other features or elements.

[0053] In the following embodiments, when a portion of a film, region, element, etc. is provided on or above another portion, it refers not only to the case where the portion is directly above the other portion but also to the case where another film, region, element, etc. is located therebetween.

[0054] In the accompanying drawings, the size of the elements may be exaggerated or reduced for ease of description. For example, for ease of description, the size (e.g., thickness) of each element shown in the accompanying drawings is arbitrarily shown, and therefore, one or more embodiments are not necessarily limited to what is shown.

[0055] When the embodiment can be implemented differently, the specific process order may be performed differently from the described order. For example, two processes described in succession may be performed substantially simultaneously or in an order opposite to the described order.

[0056] Herein, "A and / or B" means A, B, or A and B. In addition, "at least one of A and B" means A, B, or A and B.

[0057] In the following embodiments, when films, regions, elements, etc. are described as being connected, this includes cases where the films, regions, elements, etc. are directly connected and / or cases where the films, regions, elements, etc. are indirectly connected with other films, regions, or elements therebetween. For example, herein, when films, regions, elements, etc. are described as being electrically connected, this includes cases where the films, regions, elements, etc. are directly electrically connected and / or cases where the films, regions, elements, etc. are indirectly electrically connected with other films, regions, or elements therebetween.

[0058] The x-axis, y-axis, and z-axis are not limited to the three axes in the Cartesian coordinate system, but can be interpreted in a broad sense including the three axes in the Cartesian coordinate system. For example, the x-axis, y-axis, and z-axis may be orthogonal to each other, but may also refer to directions that are not orthogonal to each other.

[0059] Figure 1 is a perspective view schematically illustrating a display device 1 according to the embodiment.

[0060] refer to Figure 1 The display device 1 may include a display area DA in which an image is displayed and a non-display area NDA in which no image is displayed. The display device 1 may provide an image by an array of a plurality of sub-pixels arranged two-dimensionally on an xy plane. Each sub-pixel may emit light of a different color and may be, for example, one of a red sub-pixel, a green sub-pixel, and a blue sub-pixel.

[0061] In one embodiment, the plurality of sub-pixels may include a first sub-pixel PX1, a second sub-pixel PX2, and a third sub-pixel PX3, and hereinafter, for ease of description, the first sub-pixel PX1 is described as a red sub-pixel, the second sub-pixel PX2 is a green sub-pixel, and the third sub-pixel PX3 is described as a blue sub-pixel.

[0062] The first subpixel PX1 , the second subpixel PX2 , and the third subpixel PX3 are regions that emit red light, green light, and blue light, respectively, and the display device 1 may provide an image by using the light emitted from the subpixels.

[0063] The non-display area (NDA) does not provide an image and may completely surround the display area (DA). Drivers or main voltage lines for supplying electrical signals or power to the subpixel circuits may be arranged in the non-display area (NDA). The non-display area (NDA) may include pads to which electronic components or a printed circuit board may be electrically connected.

[0064] The display area DA may include: Figure 1 For example, the display area DA may have a rectangular shape with a horizontal length greater than a vertical length, a rectangular shape with a horizontal length less than a vertical length, or a square shape. In another embodiment, the display area DA may be circular, elliptical, or a polygonal shape such as a triangle or a pentagon. In addition, in Figure 1 , a flat panel display device is shown as the display device 1. However, the display device 1 may be implemented in various forms such as a flexible display device, a foldable display device, or a rollable display device.

[0065] In one embodiment, the display device 1 may be an organic light-emitting display device. In another embodiment, the display device 1 may be an inorganic light-emitting display device or a quantum dot light-emitting display device. For example, the emissive layer of the display element included in the display device may include an organic material, an inorganic material, quantum dots, both an organic material and quantum dots, both an inorganic material and quantum dots, or all of organic materials, inorganic materials, and quantum dots. Below, for ease of description, the case where the display device 1 is an organic light-emitting display device will be primarily described in detail.

[0066] Figure 2 is a cross-sectional view schematically illustrating a sub-pixel of the display device 1 according to the embodiment.

[0067] refer to Figure 2 The display device 1 may include a circuit layer 200 on a first substrate 100. The circuit layer 200 may include first to third sub-pixel circuits PC1, PC2, and PC3, and each of the first to third sub-pixel circuits PC1, PC2, and PC3 may include a thin film transistor and / or a capacitor. The first to third sub-pixel circuits PC1, PC2, and PC3 may be electrically connected to the first to third light-emitting elements LED1, LED2, and LED3 of the light-emitting element layer 300.

[0068] The first to third light-emitting elements LED1, LED2, and LED3 may include organic light-emitting diodes (OLEDs) containing organic materials. In another embodiment, the first to third light-emitting elements LED1, LED2, and LED3 may include inorganic light-emitting diodes (ILDs) containing inorganic materials. Inorganic ILDs may include PN junction diodes containing materials based on inorganic semiconductors. When voltage is applied to the PN junction diode in the forward direction, holes and electrons can be injected, and the energy generated by the recombination of the holes and electrons can be converted into light energy to emit light of a specific color. The inorganic ILDs may have a width ranging from a few microns to several hundred microns, or from a few nanometers to several hundred nanometers. In some embodiments, the first to third light-emitting elements LED1, LED2, and LED3 may be ILDs containing quantum dots. As described above, the emission layers of the first to third light-emitting elements LED1, LED2, and LED3 may include organic materials, inorganic materials, quantum dots, both organic and quantum dots, or both inorganic and quantum dots.

[0069] The first to third light-emitting elements LED1, LED2, and LED3 may emit light of the same color. For example, light (e.g., blue light Lb) emitted from the first to third light-emitting elements LED1, LED2, and LED3 may pass through the functional layer 500 via the encapsulation layer 400 on the light-emitting element layer 300. However, one or more embodiments are not limited thereto. In another embodiment, the first to third light-emitting elements LED1, LED2, and LED3 may emit light of different colors.

[0070] The functional layer 500 may include an optical layer that transmits light (e.g., blue light Lb) emitted from the light-emitting element layer 300 with or without converting the color of the light. For example, the functional layer 500 may include a quantum dot layer that converts light (e.g., blue light Lb) emitted from the light-emitting element layer 300 into light of another color, and a transmissive layer that transmits light (e.g., blue light Lb) emitted from the light-emitting element layer 300 without performing color conversion. The functional layer 500 may include a first quantum dot layer 510 corresponding to the first subpixel PX1, a second quantum dot layer 520 corresponding to the second subpixel PX2, and a light-transmitting layer 530 corresponding to the third subpixel PX3. The first quantum dot layer 510 may convert the blue light Lb into red light Lr, and the second quantum dot layer 520 may convert the blue light Lb into green light Lg. The light-transmitting layer 530 may transmit the blue light Lb without performing color conversion.

[0071] The color filter layer 600 may include first to third color filters 610, 620, and 630 of different colors. In one embodiment, the first color filter 610 may be a red color filter, the second color filter 620 may be a green color filter, and the third color filter 630 may be a blue color filter.

[0072] Light that is color-converted in the functional layer 500 or transmits the functional layer 500 can obtain improved color purity when passing through the first to third color filters 610, 620, and 630. In addition, the color filter layer 600 can prevent or minimize external light (e.g., light incident toward the display device 1 from outside the display device 1) from being reflected and viewed by the user.

[0073] In one embodiment, a display device 1 may include a first substrate 100 and a second substrate 700 arranged facing each other. The second substrate 700 may comprise glass or a light-transmitting organic material. For example, the second substrate 700 may comprise a light-transmitting organic material such as an acrylic resin. The display device 1 may include a light-emitting panel 1000 and a color filter panel 2000, which are arranged spaced apart from each other with a filler 800 therebetween. The light-emitting panel 1000 may include a circuit layer 200, a light-emitting element layer 300, an encapsulation layer 400, and a functional layer 500 on the first substrate 100. In other words, the functional layer 500 may be formed on the first substrate 100 rather than on the second substrate 700. In this case, the functional layer 500 may be disposed on the encapsulation layer 400 so as to be in direct contact with the encapsulation layer 400. This configuration can reduce the distance between the first to third light-emitting elements LED1, LED2, and LED3 and the functional layer 500, and minimize light loss along the path, thereby improving light efficiency.

[0074] In one embodiment, the color filter panel 2000 may include a color filter layer 600 on a surface of the second substrate 700 facing the first substrate 100. In one embodiment, the color filter layer 600 may be arranged in the direction of light output from the first light-emitting element to the third light-emitting element LED1, LED2 and LED3. A low-refractive layer 920 may be further provided on the color filter layer 600. In one embodiment, the low-refractive layer 920 may be arranged to cover the color filter layer 600. The color filter layer 600 may be arranged to face the functional layer 500 with a filler 800 therebetween. After the light-emitting panel 1000 and the color filter panel 2000 are bonded to each other, the filler 800 may fill the space between the light-emitting panel 1000 and the color filter panel 2000. The filler 800 may include a light-transmitting material such as an acrylic resin or an epoxy resin.

[0075] In another embodiment, after the functional layer 500 and the color filter layer 600 are sequentially formed on the encapsulation layer 400, a cover layer (not shown) may be directly coated and cured on the color filter layer 600. In some embodiments, the cover layer may include a light-transmitting organic material. Other optical films such as an anti-reflection (AR) film may be further provided on the cover layer.

[0076] The display device 1 having the above-described structure may include an electronic device capable of displaying moving images or still images, such as a television, a billboard, a movie screen, a monitor, a tablet personal computer (PC), or a laptop computer.

[0077] Figure 3 It is an icon Figure 2 FIG. 5 shows a functional layer 500 for each of the optical layers.

[0078] refer to Figure 3 The first quantum dot layer 510 may convert blue light Lb incident thereon into red light Lr. The first quantum dot layer 510 may include a first photosensitive polymer 511 , and may include first quantum dots 512 and first scattering particles 513 dispersed in the first photosensitive polymer 511 .

[0079] The first quantum dots 512 may be excited by the blue light Lb and may emit red light Lr having a wavelength longer than that of the blue light Lb. The first photosensitive polymer 511 may be an organic material having light transmittance.

[0080] The first scattering particles 513 can excite the first quantum dots 512 by scattering blue light Lb that is not absorbed by the first quantum dots 512, thereby improving color conversion efficiency. For example, the first scattering particles 513 can be titanium oxide (TiO2) or metal particles. The first quantum dots 512 can be selected from II-VI compounds, III-V compounds, IV-VI compounds, IV elements, IV compounds, and combinations thereof.

[0081] The II-VI compound may be selected from the group consisting of a binary compound selected from the group consisting of CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS, and mixtures thereof, a binary compound selected from the group consisting of CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, Cd A ternary compound selected from the group consisting of HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe and a mixture thereof; a ternary compound selected from the group consisting of HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe and a mixture thereof.

[0082] The III-VI compounds may include binary compounds such as In2S3 or In2Se3, ternary compounds such as InGaS3 or InGaSe3, or any combination thereof.

[0083] The III-V compound may be selected from the group consisting of a binary compound selected from the group consisting of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, and mixtures thereof, a ternary compound selected from the group consisting of GaNPs, GaNAs, GaNSb, GaPAs, GaPSb, AlNPs, AlNAs, AlNSb, AlPAs, AlPSb, InNPs, InAlPs, InNAs, InNSb, InPAs, InPSb, and mixtures thereof, a quaternary compound selected from the group consisting of GaAlNPs, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNPs, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNPs, InAlNAs, InAlNSb, InAlPAs, InAlPSb, and mixtures thereof. The III-V compound may further comprise a Group II metal (e.g., InZnP, etc.).

[0084] The IV-VI compound can be selected from the group consisting of a binary compound selected from the group consisting of SnS, SnSe, SnTe, PbS, PbSe, PbTe and mixtures thereof, a ternary compound selected from the group consisting of SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe and mixtures thereof, a quaternary compound selected from the group consisting of SnPbSSe, SnPbSeTe, SnPbSTe and mixtures thereof. The IV group element can be selected from the group consisting of silicon (Si), germanium (Ge) and mixtures thereof. The IV group compound can be a binary compound selected from the group consisting of silicon carbide (SiC), silicon germanium (SiGe) and mixtures thereof.

[0085] The second quantum dot layer 520 may convert blue light Lb incident thereon into green light Lg. The second quantum dot layer 520 may include a second photosensitive polymer 521 , and may include second quantum dots 522 and second scattering particles 523 dispersed in the second photosensitive polymer 521 .

[0086] The second quantum dots 522 may be excited by the blue light Lb and may emit green light Lg having a wavelength longer than that of the blue light Lb. The second photosensitive polymer 521 may be an organic material having light transmittance.

[0087] The second scattering particles 523 can excite the second quantum dots 522 by scattering blue light Lb that is not absorbed by the second quantum dots 522, thereby improving color conversion efficiency. For example, the second scattering particles 523 can be TiO2 or metal particles. The second quantum dots 522 can be selected from II-VI compounds, III-V compounds, IV-VI compounds, Group IV elements, Group IV compounds, and combinations thereof.

[0088] In some embodiments, the first quantum dot 512 and the second quantum dot 522 may be made of the same material. In this case, the size of the first quantum dot 512 may be larger than that of the second quantum dot 522.

[0089] The light-transmitting layer 530 can transmit the blue light Lb incident on the light-transmitting layer 530 without converting the blue light Lb. The light-transmitting layer 530 can include a third photosensitive polymer 531, and third scattering particles 533 are dispersed in the third photosensitive polymer 531. For example, the third photosensitive polymer 531 can be a light-transmitting organic material such as silicone resin or epoxy resin, and can be the same material as the first photosensitive polymer 511 and the second photosensitive polymer 521. The third scattering particles 533 can scatter and emit the blue light Lb, and can be the same material as the first scattering particles 513 and the second scattering particles 523.

[0090] Figures 4A to 4E is that the diagram can be included Figure 2 1 is a cross-sectional view of the structure of the light-emitting element LED in the light-emitting element layer 300.

[0091] refer to Figure 4A The light emitting element LED according to the embodiment may include a sub-pixel electrode 310, an opposite electrode 330, and an intermediate layer 320 between the sub-pixel electrode 310 (eg, anode) and the opposite electrode 330 (eg, cathode). In one embodiment, the light emitting element LED may be an organic light emitting element.

[0092] The sub-pixel electrode 310 may include a light-transmitting conductive oxide such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium oxide (In2O3), indium gallium oxide (IGO), or aluminum zinc oxide (AZO). The sub-pixel electrode 310 may include a reflective layer containing silver (Ag), magnesium (Mg), aluminum (Al), platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), or a mixture thereof. For example, the sub-pixel electrode 310 may have a three-layer structure of ITO / Ag / ITO.

[0093] The counter electrode 330 may be disposed on the intermediate layer 320. The counter electrode 330 may include a metal, alloy, conductive compound, or any combination thereof having a low work function. For example, the counter electrode 330 may include lithium (Li), Ag, Mg, Al, Al-Li, calcium (Ca), magnesium-indium (Mg-In), Mg-Ag, ytterbium (Yb), Ag-Yb, ITO, IZO, or any combination thereof. The counter electrode 330 may be a transmissive electrode, a semi-transmissive electrode, or a reflective electrode.

[0094] The intermediate layer 320 may include a polymer or a low molecular weight organic material that emits light of a specific color. In addition to various organic materials, the intermediate layer 320 may further include a metal-containing compound such as an organometallic compound or an inorganic material such as a quantum dot.

[0095] In one embodiment, the intermediate layer 320 may include an emissive layer and may include a first functional layer and a second functional layer below and above the emissive layer, respectively. The first functional layer may include, for example, a hole transport layer (HTL) or both an HTL and a hole injection layer (HIL). The second functional layer provided above the emissive layer is optional. The second functional layer may include an electron transport layer (ETL) and / or an electron injection layer (EIL).

[0096] refer to Figures 4B to 4E In one embodiment, the intermediate layer 320 may include at least two emission units sequentially stacked between the sub-pixel electrode 310 and the counter electrode 330, and a charge generation layer (CGL) disposed between the at least two emission units. The emission units may emit light in different wavelength bands. When the intermediate layer 320 includes the emission units and the charge generation layer (CGL), the light-emitting element (LED) may be a series-connected light-emitting element. Due to its stacked structure of multiple emission units, the light-emitting element (LED) may have improved color purity and emission efficiency.

[0097] A single emission unit may include an emission layer and may include a first functional layer and a second functional layer below and above the emission layer, respectively. The charge generation layer (CGL) may include a negative charge generation layer and a positive charge generation layer. Due to the negative charge generation layer and the positive charge generation layer, the emission efficiency of the light-emitting element LED (which is a series light-emitting element having multiple emission layers) can be further improved.

[0098] The negative charge generation layer may be an n-type charge generation layer. The negative charge generation layer may supply electrons. The negative charge generation layer may include a host and a dopant. The host may include an organic material. The dopant may include a metallic material. The positive charge generation layer may be a p-type charge generation layer. The positive charge generation layer may supply holes. The positive charge generation layer may include a host and a dopant. The host may include an organic material. The dopant may include a metallic material.

[0099] In one embodiment, if Figure 4B As shown in , the light-emitting element LED may include a first emission unit EU1 and a second emission unit EU2 stacked in sequence, wherein the first emission unit EU1 includes a first emission layer EML1 and the second emission unit EU2 includes a second emission layer EML2. A charge generation layer CGL may be provided between the first emission unit EU1 and the second emission unit EU2. For example, the light-emitting element LED may include a sub-pixel electrode 310, a first emission layer EML1, a charge generation layer CGL, a second emission layer EML2, and a counter electrode 330 stacked in sequence. The first functional layer and the second functional layer may be included below and above the first emission layer EML1, respectively. The first functional layer and the second functional layer may be included below and above the second emission layer EML2, respectively.

[0100] In one embodiment, if Figure 4C As shown in , the light-emitting element LED may include a first emission unit EU1, a second emission unit EU2, and a third emission unit EU3, wherein the first emission unit EU1 and the third emission unit EU3 include a first emission layer EML1, and the second emission unit EU2 includes a second emission layer EML2. A first charge generation layer CGL1 may be provided between the first emission unit EU1 and the second emission unit EU2, and a second charge generation layer CGL2 may be provided between the second emission unit EU2 and the third emission unit EU3. For example, the light-emitting element LED may include a sub-pixel electrode 310, a first emission layer EML1, a first charge generation layer CGL1, a second emission layer EML2, a second charge generation layer CGL2, a first emission layer EML1, and a counter electrode 330 stacked in sequence. The first functional layer and the second functional layer may be included below and above the first emission layer EML1, respectively. The first functional layer and the second functional layer may be included below and above the second emission layer EML2, respectively.

[0101] In one embodiment, in the light emitting element LED, in addition to the second emission layer EML2, the second emission unit EU2 may further include a third emission layer EML3 directly contacting the lower portion and / or upper portion of the second emission layer EML2 (see Figure 4D ) and / or the fourth emission layer EML4 (see Figure 4E Here, “direct contact” may mean that no other layer is arranged between the second emission layer EML2 and the third emission layer EML3 and / or between the second emission layer EML2 and the fourth emission layer EML4.

[0102] For example, Figure 4DAs shown in , the light emitting element LED may include a sub-pixel electrode 310, a first emission layer EML1, a first charge generation layer CGL1, a third emission layer EML3, a second emission layer EML2, a second charge generation layer CGL2, a first emission layer EML1 and an opposite electrode 330 stacked sequentially. Alternatively, as Figure 4E As shown in the figure, the light emitting element LED may include a sub-pixel electrode 310, a first emission layer EML1, a first charge generation layer CGL1, a third emission layer EML3, a second emission layer EML2, a fourth emission layer EML4, a second charge generation layer CGL2, a first emission layer EML1 and an opposing electrode 330 stacked sequentially.

[0103] Figure 5 is an equivalent circuit diagram illustrating a light emitting element LED included in a display device according to an embodiment and a sub-pixel circuit PC electrically connected to the light emitting element LED.

[0104] refer to Figure 5 The sub-pixel electrode (e.g., anode) of the light-emitting element LED may be electrically connected to the sub-pixel circuit PC, and the counter electrode (e.g., cathode) of the light-emitting element LED may be connected to a common voltage line VSL that provides a common power supply voltage ELVSS. The light-emitting element LED may emit light having a brightness corresponding to the amount of current supplied from the sub-pixel circuit PC.

[0105] Figure 5 The light emitting element LED can be used with Figure 2 Each of the first to third light emitting elements LED1, LED2 and LED3 shown in FIG corresponds to, and Figure 5 The sub-pixel circuit PC can be connected with Figure 2 Each of the first to third sub-pixel circuits PC1, PC2 and PC3 shown in FIG corresponds to .

[0106] In response to the data signal, the sub-pixel circuit PC can control the amount of current flowing from the driving power voltage ELVDD to the common power voltage ELVSS via the light emitting element LED. The sub-pixel circuit PC may include a first transistor M1, a second transistor M2, a third transistor M3 and a storage capacitor Cst.

[0107] Each of the first transistor M1, the second transistor M2, and the third transistor M3 may be an oxide semiconductor thin film transistor including a semiconductor layer containing an oxide semiconductor, or each of the first transistor M1, the second transistor M2, and the third transistor M3 may be a silicon semiconductor thin film transistor including a semiconductor layer containing polycrystalline silicon. The transistor includes a first electrode and a second electrode, and depending on the type, the first electrode may be one of a source electrode and a drain electrode, and the second electrode may be the other of the source electrode and the drain electrode.

[0108] The first transistor M1 may be a driving transistor. A first electrode of the first transistor M1 may be electrically connected to a driving voltage line VDL configured to supply a driving power supply voltage ELVDD, and a second electrode of the first transistor M1 may be electrically connected to a subpixel electrode of the light-emitting element LED. A gate electrode of the first transistor M1 may be electrically connected to a first node N1. In response to a voltage at the first node N1, the first transistor M1 may control the amount of current flowing from the driving power supply voltage ELVDD to the light-emitting element LED.

[0109] The second transistor M2 may be a switching transistor. A first electrode of the second transistor M2 may be electrically connected to the data line DL, and a second electrode of the second transistor M2 may be electrically connected to the first node N1. A gate electrode of the second transistor M2 may be electrically connected to the scan line SL. The second transistor M2 may be turned on when receiving a scan signal via the scan line SL and may electrically connect the data line DL to the first node N1.

[0110] The third transistor M3 may be an initialization transistor and / or a sensing transistor. A first electrode of the third transistor M3 may be electrically connected to the second node N2, and a second electrode of the third transistor M3 may be connected to the sensing line SEL. A gate electrode of the third transistor M3 may be electrically connected to the control line CL.

[0111] The third transistor M3 can be turned on when receiving a control signal via the control line CL and can electrically connect the sensing line SEL to the second node N2. In some embodiments, the third transistor M3 can be turned on in response to a signal received via the control line CL and can transmit an initialization voltage from the sensing line SEL to the light-emitting element LED and initialize the sub-pixel electrode. In some embodiments, the third transistor M3 can be turned on when receiving a control signal via the control line CL and can sense characteristic information of the light-emitting element LED. The third transistor M3 can have both the functions of the initialization transistor and the sensing transistor described above, or can have at least one of the functions. In some embodiments, when the third transistor M3 has the function of the initialization transistor, the sensing line SEL can be referred to as an initialization voltage line. The initialization operation and the sensing operation of the third transistor M3 can be performed separately or simultaneously.

[0112] The storage capacitor Cst may be connected between the first node N1 and the second node N2. For example, the first capacitor electrode of the storage capacitor Cst may be electrically connected to the gate electrode of the first transistor M1, and the second capacitor electrode of the storage capacitor Cst may be electrically connected to the sub-pixel electrode of the light emitting element LED.

[0113] exist Figure 5In the embodiment, the first transistor M1, the second transistor M2 and the third transistor M3 are n-type metal oxide semiconductor field effect transistors (MOSFET; NMOS). However, in another embodiment, at least one of the first transistor M1, the second transistor M2 and the third transistor M3 can be provided as a p-type MOSFET (PMOS).

[0114] exist Figure 5 , three transistors are shown. However, in another embodiment, the sub-pixel circuit PC may include four or more transistors.

[0115] Figure 6 is a cross-sectional view schematically illustrating a display device according to an embodiment.

[0116] refer to Figure 6 , the first to third sub-pixel circuits PC1, PC2, and PC3 may be provided on a first substrate 100. The first substrate 100 may be a glass substrate containing silicon dioxide (SiO2) as a main component. For example, the glass substrate may be a glass substrate having a thickness of approximately 500 μm or an ultra-thin glass substrate having a thickness of approximately 30 μm. In another embodiment, the first substrate 100 may contain a polymer resin. The first substrate 100 containing a polymer resin may have flexible, foldable, rollable, or bendable properties. In another embodiment, the first substrate 100 may have a multilayer structure including a layer and an inorganic layer, the layer containing a polymer resin.

[0117] As referenced above Figure 5 As described above, each of the first to third sub-pixel circuits PC1, PC2, and PC3 may include a first transistor, a second transistor, a third transistor, and a storage capacitor. Figure 6 A transistor TR and a storage capacitor Cst corresponding to any one of the first transistor, the second transistor, and the third transistor are shown.

[0118] In one embodiment, the storage capacitor Cst may include a first capacitor electrode CE1 and a second capacitor electrode CE2, and the second capacitor electrode CE2 may include a first sub-capacitor electrode CE2b and a second sub-capacitor electrode CE2t disposed below and above the first capacitor electrode CE1, respectively, with the first capacitor electrode CE1 therebetween.

[0119] The first sub-capacitor electrode CE2b may be provided on the first substrate 100. For example, the first sub-capacitor electrode CE2b may be in direct contact with the upper surface of the first substrate 100. The first sub-capacitor electrode CE2b may include a metal having conductivity, such as Al, Pt, Pd, Ag, Mg, Au, Ni, Nd, Ir, Cr, Ca, molybdenum (Mo), titanium (Ti), tungsten (W), and / or copper (Cu). Although not shown, reference Figure 5 The described driving voltage line, common voltage line, and / or data line may be formed together in the same process as that of forming the first sub-capacitor electrode CE2 b .

[0120] The buffer layer 201 may be disposed on the first sub-capacitor electrode CE2b and may include an inorganic insulating material. The buffer layer 201 may include an inorganic insulating material such as silicon nitride, silicon oxide, and / or silicon oxynitride, and may include a single layer or a multilayer structure including the above materials.

[0121] The semiconductor layer Act may be provided on the buffer layer 201. The semiconductor layer Act may include an oxide-based semiconductor material such as indium gallium zinc oxide (IGZO), amorphous silicon, polycrystalline silicon, or an organic semiconductor material.

[0122] The gate insulating layer 203 may be disposed on the semiconductor layer Act. The gate insulating layer 203 may include an inorganic insulating material such as silicon nitride, silicon oxide, and / or silicon oxynitride, and may include a single layer or a multilayer structure including the above materials.

[0123] The gate electrode GE may be disposed on the gate insulating layer 203 and may overlap a portion of the semiconductor layer Act. The gate electrode GE may overlap a channel region CR of the semiconductor layer Act in a plan view, and the semiconductor layer Act may include the channel region CR, a source region SR, and a drain region DR, and the source region SR and the drain region DR may be disposed on opposite sides of the channel region CR, respectively.

[0124] The first capacitor electrode CE1 may be arranged on the same layer as the layer on which the gate electrode GE is arranged, and may include the same material. The first capacitor electrode CE1 and the gate electrode GE may be formed by the same process. The first capacitor electrode CE1 and the gate electrode GE may include a conductive metal such as Al, Pt, Pd, Ag, Mg, Au, Ni, Nd, Ir, Cr, Ca, Mo, Ti, W and / or Cu. According to one embodiment, the first capacitor electrode CE1 and the gate electrode GE may have a layered structure of Mo / Al / Mo. In another embodiment, the first capacitor electrode CE1 and the gate electrode GE may include titanium nitride (TiN x ) layer, Al layer and / or Ti layer.

[0125] An interlayer insulating layer 204 may be disposed on the first capacitor electrode CE1 and the gate electrode GE. The interlayer insulating layer 204 may include an inorganic insulating material such as silicon nitride, silicon oxide, and / or silicon oxynitride, and may include a single layer or a multilayer structure including the above materials.

[0126] The second sub-capacitor electrode CE2t may be disposed on the interlayer insulating layer 204. The second sub-capacitor electrode CE2t may be electrically connected to the first sub-capacitor electrode CE2b via a contact hole passing through the insulating layer, with the insulating layer located between the second sub-capacitor electrode CE2t and the first sub-capacitor electrode CE2b. For example, the second sub-capacitor electrode CE2t may be connected to the first sub-capacitor electrode CE2b via a contact hole passing through the buffer layer 201, the gate insulating layer 203, and the interlayer insulating layer 204. The second sub-capacitor electrode CE2t may include, for example, a Ti layer, an Al layer, and / or a Cu layer. According to one embodiment, the second sub-capacitor electrode CE2t may have a layered structure of Ti / Al / Ti.

[0127] A path insulating layer 205 may be provided on the first to third sub-pixel circuits PC1, PC2, and PC3. The path insulating layer 205 may include an inorganic insulating material and / or an organic insulating material. For example, the path insulating layer 205 may include an organic insulating material such as acrylic acid, benzocyclobutene (BCB), polyimide, or hexamethyldisiloxane (HMDSO). The path insulating layer 205 may be provided as one or more layers.

[0128] Each of the first to third sub-pixel circuits PC1, PC2, and PC3 provided on the first substrate 100 may include a transistor TR and a storage capacitor Cst having the above-described structure, and may be electrically connected to a corresponding one of the sub-pixel electrodes 311, 312, and 313 of the light-emitting elements LED1, LED2, and LED3.

[0129] A first light-emitting element LED1, which includes a first subpixel electrode 311, an opposing electrode 330, and an intermediate layer 320 therebetween, can be located in the first subpixel PX1. The intermediate layer 320 includes an emissive layer. A second light-emitting element LED2, which is an organic light-emitting diode including a second subpixel electrode 312, an opposing electrode 330, and an intermediate layer 320 therebetween, can be located in the second subpixel PX2. The intermediate layer 320 includes an emissive layer. Furthermore, a third light-emitting element LED3, which is an organic light-emitting element including a third subpixel electrode 313, an opposing electrode 330, and an intermediate layer 320 therebetween, can be located in the third subpixel PX3. The intermediate layer 320 includes an emissive layer. The description of the first subpixel electrode 311 provided above can also apply to the second and third subpixel electrodes 312 and 313.

[0130] The intermediate layer 320 may be located not only on the first subpixel electrode 311 of the first subpixel PX1, but also on the second subpixel electrode 312 of the second subpixel PX2 and the third subpixel electrode 313 of the third subpixel PX3. The intermediate layer 320 may have a unitary shape spanning the first subpixel electrode 311, the second subpixel electrode 312, and the third subpixel electrode 313. The intermediate layer 320 may be patterned and located on the first subpixel electrode 311, the second subpixel electrode 312, and the third subpixel electrode 313. In addition to the emission layer, the intermediate layer 320 may include a HIL, a HTL, and / or an ETL, and the layers included in the intermediate layer 320 may also have a unitary shape spanning the first subpixel electrode 311, the second subpixel electrode 312, and the third subpixel electrode 313. Some of the layers included in the intermediate layer 320 may be patterned and located on the first subpixel electrode 311, the second subpixel electrode 312, and the third subpixel electrode 313.

[0131] The counter electrode 330 may be disposed on the intermediate layer 320 and may have an integral shape spanning the first to third sub-pixel electrodes 311 , 312 , and 313 .

[0132] In one embodiment, the intermediate layer 320 may include a single emission layer. The first light emitting element LED1 to the third light emitting element LED3 may emit blue light. In another embodiment, as described above with reference to Figures 4B to 4E As described above, the intermediate layer 320 may have a stacked structure including at least two emission units that emit light in different wavelength bands. In one embodiment, the first to third light-emitting elements LED1 to LED3 may include an emission layer of a first color and an emission layer of a second color. For example, each of the intermediate layers 320 of the first to third light-emitting elements LED1 to LED3 may include a stacked structure of an emission unit that emits blue light and an emission unit that emits red light. The first to third light-emitting elements LED1 to LED3 may emit mixed light that is a mixture of blue and red light. Alternatively, each of the intermediate layers 320 of the first to third light-emitting elements LED1 to LED3 may include a stacked structure of an emission unit that emits blue light, an emission unit that emits green light, and an emission unit that emits yellow light. The first to third light-emitting elements LED1 to LED3 may emit mixed light that is a mixture of blue, green, and yellow light. Alternatively, each of the intermediate layers 320 of the first to third light-emitting elements LED1 to LED3 may include a stacked structure of an emission unit that emits blue light, an emission unit that emits green light, and an emission unit that emits red light. The first to third light emitting elements LED1 to LED3 may emit white light which is a mixture of blue light, green light, and red light.

[0133] The first to third light-emitting elements LED1 to LED3 can emit light belonging to the first wavelength band. Specifically, the first to third light-emitting elements LED1 to LED3 can emit light belonging to the first wavelength band toward the first quantum dot layer 510, the second quantum dot layer 520, and the light-transmitting layer 530. In one embodiment, the single light emitted from the first to third light-emitting elements LED1 to LED3 can be light in a wavelength band of approximately 380 nanometers (nm) to approximately 780 nm, which corresponds to the visible light region. For example, the spectrum of the single light emitted from the first to third light-emitting elements LED1 to LED3 can have a peak wavelength of approximately 380 nm to approximately 550 nm. In one embodiment, the mixed light emitted from the first to third light-emitting elements LED1 to LED3 can be light in a wavelength band of approximately 380 nm to approximately 780 nm.

[0134] A pixel defining layer (also referred to as a sub-pixel defining layer) 210 may be provided on the path insulating layer 205. The pixel defining layer 210 may have sub-pixel openings corresponding to the sub-pixels. In other words, the pixel defining layer 210 may cover the edge of each of the first sub-pixel electrode 311, the second sub-pixel electrode 312, and the third sub-pixel electrode 313, and may have a first sub-pixel opening (also referred to as a first opening) 211 exposing the central portion of the first sub-pixel electrode 311, a second sub-pixel opening (also referred to as a second opening) 212 exposing the central portion of the second sub-pixel electrode 312, and a third sub-pixel opening (also referred to as a third opening) 213 exposing the central portion of the third sub-pixel electrode 313. The portion of the pixel defining layer 210 other than the first to third sub-pixel openings 211, 212, and 213 is referred to as a main portion and may refer to a portion having a certain thickness. The pixel defining layer 210 can increase the distance between the electrode 330 and the edge of each of the first sub-pixel electrode 311, the second sub-pixel electrode 312 and the third sub-pixel electrode 313, thereby preventing arcing, etc. from occurring at the edges of the first sub-pixel electrode 311, the second sub-pixel electrode 312 and the third sub-pixel electrode 313.

[0135] The first to third sub-pixel openings 211, 212, and 213 of the pixel-defining layer 210 can define the light-emitting regions of the first to third light-emitting elements LED1, LED2, and LED3, respectively. For example, the first sub-pixel opening 211 of the pixel-defining layer 210 corresponding to the first light-emitting element LED1 can define a first light-emitting region, the second sub-pixel opening 212 of the pixel-defining layer 210 corresponding to the second light-emitting element LED2 can define a second light-emitting region, and the third sub-pixel opening 213 of the pixel-defining layer 210 corresponding to the third light-emitting element LED3 can define a third light-emitting region. The pixel-defining layer 210 can include an organic material such as polyimide or HMDSO.

[0136] refer to Figure 6 , the first bank barrier layer 450 may be provided on the counter electrode 330. A 1-1 bank barrier opening 451, a 1-2 bank barrier opening 452, and a 1-3 bank barrier opening 453 may be defined in the first bank barrier layer 450. The portion of the first bank barrier layer 450 other than the 1-1 to 1-3 bank barrier openings 451, 452, and 453 is referred to as a main portion and may refer to a portion having a certain thickness. The 1-1 bank barrier opening 451 may correspond to the first sub-pixel opening 211 of the pixel defining layer 210 that exposes the first sub-pixel electrode 311, the 1-2 bank barrier opening 452 may correspond to the second sub-pixel opening 212 of the pixel defining layer 210 that exposes the second sub-pixel electrode 312, and the 1-3 bank barrier opening 453 may correspond to the third sub-pixel opening 213 of the pixel defining layer 210 that exposes the third sub-pixel electrode 313.

[0137] The first bank layer 450 may include various materials, including organic materials or inorganic materials. For example, the first bank layer 450 may include an inorganic material such as silicon oxide, silicon nitride, or silicon oxynitride, or an organic material such as BCB or HMDSO. In one embodiment, the first bank layer 450 may include a light-shielding material to function as a light-shielding layer. For example, the light-shielding material may include at least one of a black pigment, a black dye, black particles, and metal particles.

[0138] The first bank layer 450 may prevent light emitted from the first to third light emitting elements LED1, LED2, and LED3 from flowing into the functional layer 500 of another adjacent sub-pixel instead of the corresponding functional layer 500 (see FIG. Figure 2 ) causes color mixing.

[0139] The first to third light-emitting elements LED1, LED2 and LED3 of the organic light-emitting diode may be easily degraded by moisture or oxygen. Accordingly, the encapsulation layer 400 may be provided on the first to third light-emitting elements LED1, LED2 and LED3. The encapsulation layer 400 may be arranged to cover the first dam layer 450 and the first to third light-emitting elements LED1, LED2 and LED3. The encapsulation layer 400 may protect the first to third light-emitting elements LED1, LED2 and LED3 from moisture or oxygen from the outside. The encapsulation layer 400 may include at least one inorganic encapsulation layer and at least one organic encapsulation layer. For example, the encapsulation layer 400 may include a first inorganic encapsulation layer 410, a second inorganic encapsulation layer 430 and an organic encapsulation layer 420 therebetween.

[0140] Each of the first inorganic encapsulation layer 410 and the second inorganic encapsulation layer 430 may include one or more inorganic insulating materials. The inorganic insulating material may include one or more inorganic insulating materials such as silicon oxide, silicon nitride, silicon oxynitride, aluminum oxide, titanium oxide, tantalum oxide, hafnium oxide or zinc oxide. The organic encapsulation layer 420 may include a polymer material. The polymer material may include an acrylic resin, an epoxy resin, polyimide and polyethylene. For example, the organic encapsulation layer 420 may include an acrylic resin such as poly(methyl methacrylate) or polyacrylic acid. The organic encapsulation layer 420 may be formed by curing a monomer or coating a polymer.

[0141] Because the first inorganic encapsulating layer 410 is formed by chemical vapor deposition and has a substantially uniform thickness, the upper surface of the first inorganic encapsulating layer 410 may not be flat. However, the upper surface of the organic encapsulating layer 420 has a substantially flat shape, and accordingly, the upper surface of the second inorganic encapsulating layer 430 on the organic encapsulating layer 420 may also have a substantially flat shape.

[0142] The second bank barrier layer 540 may be provided on the encapsulation layer 400. A 2-1st bank barrier opening 541, a 2-2nd bank barrier opening 542, and a 2-3rd bank barrier opening 543 may be defined in the second bank barrier layer 540. The portion of the second bank barrier layer 540 other than the 2-1st to 2-3rd bank barrier openings 541, 542, and 543 is referred to as a main portion and may refer to a portion having a certain thickness. The 2-1st bank barrier opening 541 may correspond to the first sub-pixel opening 211 of the pixel defining layer 210 that exposes the first sub-pixel electrode 311, the 2-2nd bank barrier opening 542 may correspond to the second sub-pixel opening 212 of the pixel defining layer 210 that exposes the second sub-pixel electrode 312, and the 2-3rd bank barrier opening 543 may correspond to the third sub-pixel opening 213 of the pixel defining layer 210 that exposes the third sub-pixel electrode 313.

[0143] The second bank layer 540 may include various materials including organic materials or inorganic materials. For example, the second bank layer 540 may include an inorganic material such as silicon oxide, silicon nitride, or silicon oxynitride, or an organic material such as BCB or HMDSO. In some cases, the second bank layer 540 may include a light-shielding material to function as a light-shielding layer. For example, the light-shielding material may include at least one of a black pigment, a black dye, black particles, and metal particles.

[0144] The second bank layer 540 can prevent light converted and scattered in the first quantum dot layer 510, the second quantum dot layer 520 and the light-transmitting layer 530 described below from traveling to other regions. In addition, the second bank layer 540 can be combined with the color filter layer 600 (see FIG. Figure 2 ) together with preventing reflection of external light, so that the contrast of the display device can be improved.

[0145] The first quantum dot layer 510 may be located in the 2-1 bank opening 541 of the second bank layer 540. The second quantum dot layer 520 may be located in the 2-2 bank opening 542 of the second bank layer 540. The light-transmitting layer 530 may be located in the 2-3 bank opening 543. The materials included in the first quantum dot layer 510, the second quantum dot layer 520, and the light-transmitting layer 530 are as described above with reference to Figure 3 Each of the first quantum dot layer 510, the second quantum dot layer 520, and the light-transmitting layer 530 may be formed by an inkjet method. The first quantum dots 512 and the second quantum dots 522, respectively included in the first quantum dot layer 510 and the second quantum dot layer 520, are crystals of semiconductor compounds and may include any material that emits light of various wavelengths depending on the size of the crystals. The diameter of the quantum dots may be, for example, approximately 1 nm to approximately 10 nm.

[0146] The first quantum dot layer 510 can receive light belonging to the first wavelength band from the first light-emitting element LED1 and convert a portion of the received light belonging to the first wavelength band into light belonging to the second wavelength band. For example, the spectrum of the light belonging to the second wavelength band can have a peak wavelength of approximately 550 nm to approximately 780 nm, and the full width at half maximum can be approximately 50 nm or less. The second quantum dot layer 520 can receive light belonging to the first wavelength band from the second light-emitting element LED2 and convert a portion of the received light belonging to the first wavelength band into light belonging to the third wavelength band. For example, the spectrum of the light belonging to the third wavelength band can have a peak wavelength of approximately 500 nm to approximately 550 nm, and the full width at half maximum can be approximately 50 nm or less.

[0147] The wavelength band to which the target wavelength converted by the first quantum dot layer 510 and the second quantum dot layer 520 , respectively, belongs and the wavelength band to which the converted wavelength belongs may be modified differently.

[0148] Each of the first quantum dot layer 510 , the second quantum dot layer 520 , the light-transmitting layer 530 , and the second bank layer 540 may be disposed in contact with the second inorganic encapsulation layer 430 of the encapsulation layer 400 .

[0149] In one embodiment, the first passivation layer 910 may be disposed on the functional layer 500 (see Figure 2 ). The first quantum dot layer 510, the second quantum dot layer 520, the light-transmitting layer 530, and the second bank barrier layer 540 may include organic materials and may be covered by the first passivation layer 910 to prevent moisture from penetrating into the organic materials. For example, the second passivation layer 930 may include an inorganic material such as silicon oxide, silicon nitride, or silicon oxynitride, and may be formed by a chemical vapor deposition (CVD) method.

[0150] The color filter layer 600 may be disposed between the second substrate 700 and the second bank layer 540. The second substrate 700 may be a glass substrate including SiO 2 as a main component. In another embodiment, the second substrate 700 may include a polymer resin.

[0151] When viewed from a direction perpendicular to the first substrate 100 (i.e., a plan view), in the plan view, the first color filter 610 can be located in the first subpixel PX1 to overlap with the first light-emitting element LED1, the second color filter 620 can be located in the second subpixel PX2 to overlap with the second light-emitting element LED2, and the third color filter 630 can be located in the third subpixel PX3 to overlap with the third light-emitting element LED3.

[0152] In one embodiment, the first color filter 610 can transmit red light emitted from the first quantum dot layer 510. For example, the first color filter 610 can receive light in the second wavelength band from the first quantum dot layer 510 and transmit a portion of the received light. For example, the first color filter 610 can transmit light between approximately 550 nm and approximately 780 nm. The second color filter 620 can transmit green light emitted from the second quantum dot layer 520. For example, the second color filter 620 can receive light in the third wavelength band from the second quantum dot layer 520 and transmit a portion of the received light. For example, the second color filter 620 can transmit light between approximately 470 nm and approximately 600 nm. The third color filter 630 can transmit blue light from the third light-emitting element LED3. For example, the third color filter 630 can receive light in the first wavelength band that has passed through the light-transmitting layer 530 and transmit a portion of the received light. For example, the third color filter 630 can transmit light between approximately 380 nm and approximately 500 nm.

[0153] like Figure 6 As shown in FIG, the third color filter 630 may have a second color filter opening 602 corresponding to the second light emitting element LED2. The second color filter 620 may fill at least the second color filter opening 602 of the third color filter 630.

[0154] In addition, the second color filter 620 may have a third color filter opening 603 corresponding to the third light emitting element LED 3 . The third color filter 630 may fill or cover at least the third color filter opening 603 of the second color filter 620 .

[0155] The third color filter 630 may have a first color filter opening 601 corresponding to the first light emitting element LED 1 . The first color filter 610 may fill at least the first color filter opening 601 of the third color filter 630 .

[0156] The portion where at least two color filters overlap each other constitutes a "light-shielding portion," and the light-shielding portion can function as a black matrix. For example, in the portion where the first color filter 610 and the second color filter 620, which transmit light of different colors, overlap each other in a plan view, theoretically, no light can pass through both the first color filter 610 and the second color filter 620.

[0157] exist Figure 6 , an embodiment is illustrated in which the third color filter 630, the second color filter 620, and the first color filter 610 are sequentially disposed on the second substrate 700. However, the stacking order of the first color filter 610, the second color filter 620, and the third color filter 630 may be changed.

[0158] The second passivation layer 930 may be located between the second bank layer 540 and the first, second, and third color filters 610, 620, and 630. For example, the second passivation layer 930 may include an inorganic material such as silicon oxide, silicon nitride, or silicon oxynitride and may be formed by a CVD method. The second passivation layer 930 may prevent or minimize defects caused by impurities such as gases generated in the first, second, and / or third color filters 610, 620, and 630 penetrating into the first and second quantum dot layers 510, 520, and the emission layer of the organic light-emitting element thereunder.

[0159] The low-refractive layer 920 may be located between the second passivation layer 930 and the first color filter 610, the second color filter 620, and the third color filter 630. The low-refractive layer 920 may include an inorganic material such as silicon oxide, silicon nitride, or silicon oxynitride, and may be formed by a CVD method. When the low-refractive layer 920 is included, the utilization rate of light can be increased by reflection and re-incident, thereby further improving light efficiency.

[0160] refer to Figure 2and Figure 6 The light emitting panel 1000 and the color filter panel 2000 are bonded to each other by a sealant or the like, and then the filler 800 may fill the space therebetween. The filler 800 may fill the space between the light emitting panel 1000 and the color filter panel 2000.

[0161] Figure 7 is a cross-sectional view schematically illustrating a display device according to another embodiment. Figure 6 The embodiments show the differences of the device.

[0162] refer to Figure 2 and Figure 7 The display device may include a first substrate 100, a light emitting element layer 300 arranged on the first substrate 100 and including first to third light emitting elements LED1, LED2 and LED3, a first embankment layer 450 on the light emitting element layer 300, an encapsulation layer 400 arranged on the first embankment layer 450 and including a first inorganic encapsulation layer 410 and a second inorganic encapsulation layer 430 and an organic encapsulation layer 420, a functional layer 500 arranged on the encapsulation layer 400 and including a first quantum dot layer 510, a second quantum dot layer 520 and a light-transmitting layer 530, and a color filter layer 600 arranged on the functional layer 500.

[0163] In one embodiment, the display device may not include a second substrate disposed facing the first substrate 100 and may include only one substrate (ie, the first substrate 100). The functional layer 500 and the color filter layer 600 may be provided on the first substrate 100. The display device may not include a filler.

[0164] The functional layer 500 and the color filter layer 600 may be sequentially formed on the encapsulation layer 400. The third color filter 630, the second color filter 620, and the first color filter 610 of the color filter layer 600 may be sequentially stacked on the functional layer 500.

[0165] In one embodiment, the first passivation layer 910 may be disposed between the color filter layer 600 and the functional layer 500. The low-refractive layer 920 may be disposed between the first passivation layer 910 and the color filter layer 600.

[0166] In the following, based on Figure 6 The stacking structure is described.

[0167] Figure 8A and Figure 8B is a plan view schematically illustrating a portion of a display device according to an embodiment. Figure 8A A portion of the display device including the first to third sub-pixel electrodes 311 , 312 , and 313 , the pixel defining layer 210 , and the first bank layer 450 is shown. Figure 8BA portion of the display device including the second bank layer 540 , the first quantum dot layer 510 , the second quantum dot layer 520 , and the light-transmitting layer 530 is shown. Figure 9 It is along Figure 8A and Figure 8B The cross-sectional view taken along the lines II' and BB'. Figure 6 Along with Figure 8A and Figure 8B As used herein, a “plan view” is a view in the thickness direction (z-axis direction) of the first substrate 100 .

[0168] refer to Figure 8A and Figure 8B , the first sub-pixel PX1 to the third sub-pixel PX3 may be arranged in a stripe manner. In other words, the first sub-pixel PX1, the second sub-pixel PX2 and the third sub-pixel PX3 may be arranged in sequence along the x-axis direction. However, one or more embodiments are not limited thereto. In another embodiment, the first sub-pixel PX1 to the third sub-pixel PX3 may be arranged in an s-stripe manner, a mosaic method or a Method layout.

[0169] When viewed from a direction perpendicular to the first substrate 100 (ie, a plan view), the first subpixel PX1, the second subpixel PX2, and the third subpixel PX3 may have a polygonal shape. Figure 8A and Figure 8B , each of the portions of the first subpixel electrode 311 of the first subpixel PX1, the second subpixel electrode 312 of the second subpixel PX2, and the third subpixel electrode 313 of the third subpixel PX3 exposed by the pixel defining layer 210 has a rectangular shape. However, one or more embodiments are not limited thereto. Each of the portions of the first subpixel electrode 311 of the first subpixel PX1, the second subpixel electrode 312 of the second subpixel PX2, and the third subpixel electrode 313 of the third subpixel PX3 exposed by the pixel defining layer 210 may have a circular shape, an elliptical shape, or a polygonal shape other than a rectangular shape.

[0170] The first subpixel PX1 may include a first subpixel electrode 311, the second subpixel PX2 may include a second subpixel electrode 312, and the third subpixel PX3 may include a third subpixel electrode 313. The pixel-defining layer 210 may cover the edge of each of the first subpixel electrode 311, the second subpixel electrode 312, and the third subpixel electrode 313. In other words, a first subpixel opening 211 exposing the center of the first subpixel electrode 311, a second subpixel opening 212 exposing the center of the second subpixel electrode 312, and a third subpixel opening 213 exposing the center of the third subpixel electrode 313 may be defined in the pixel-defining layer 210.

[0171] The first bank layer 450 may be disposed on the pixel defining layer 210. A 1-1st bank opening 451, a 1-2nd bank opening 452, and a 1-3rd bank opening 453 may be defined in the first bank layer 450. The 1-1st bank opening 451 may correspond to the first sub-pixel opening 211 defined in the pixel defining layer 210, the 1-2nd bank opening 452 may correspond to the second sub-pixel opening 212 defined in the pixel defining layer 210, and the 1-3rd bank opening 453 may correspond to the third sub-pixel opening 213 defined in the pixel defining layer 210.

[0172] The main portion of the first bank layer 450 may be arranged to surround the first to third sub-pixel openings 211, 212, and 213. When viewed from a direction perpendicular to the first substrate 100 (i.e., in a plan view), the area of the 1-1st bank opening 451 defined in the first bank layer 450 may be larger than the area of the first sub-pixel opening 211 defined in the pixel-defining layer 210, the area of the 1-2nd bank opening 452 may be larger than the area of the second sub-pixel opening 212 defined in the pixel-defining layer 210, and the area of the 1-3rd bank opening 453 may be larger than the area of the third sub-pixel opening 213 defined in the pixel-defining layer 210.

[0173] The main portion of the first barrier layer 450 may include a light-shielding material. In other words, light emitted from the first light-emitting element LED1 can move within the 1-1 barrier opening 451. Light emitted from the second light-emitting element LED2 can move within the 1-2 barrier opening 452. Light emitted from the third light-emitting element LED3 can move within the 1-3 barrier opening 453.

[0174] refer to Figure 8B , a 2-1st bank opening 541, a 2-2nd bank opening 542, and a 2-3rd bank opening 543 may be defined in the second bank layer 540. The 2-1st bank opening 541 may correspond to the first sub-pixel opening 211 defined in the pixel defining layer 210, the 2-2nd bank opening 542 may correspond to the second sub-pixel opening 212 defined in the pixel defining layer 210, and the 2-3rd bank opening 543 may correspond to the third sub-pixel opening 213 defined in the pixel defining layer 210.

[0175] The first quantum dot layer 510 may be located in the 2-1st bank opening 541. The second quantum dot layer 520 may be located in the 2-2nd bank opening 542. The light-transmitting layer 530 may be arranged in the 2-3rd bank opening 543. The shape of the edge of the 2-1st bank opening 541 may be the same as or similar to the shape of the edge of the first quantum dot layer 510. The shape of the edge of the 2-2nd bank opening 542 may be the same as or similar to the shape of the edge of the second quantum dot layer 520. The shape of the edge of the 2-3rd bank opening 543 may be the same as or similar to the shape of the edge of the light-transmitting layer 530.

[0176] When viewed from a direction perpendicular to the first substrate 100 (i.e., in a plan view), the second quantum dot layer 520 may include a first portion 520P1 and a second portion 520P2. The first portion 520P1 of the second quantum dot layer 520 may include a 1-1 portion 520m overlapping the second sub-pixel opening 212 in a plan view and a 1-2 portion 520b extending from the 1-1 portion 520m in the x-direction and the y-direction. The second portion 520P2 of the second quantum dot layer 520 may be a portion extending from the first portion 520P1 (e.g., the 1-2 portion 520b) toward the direction (e.g., the −x direction) along which the second sub-pixel opening 212 faces the first sub-pixel opening 211. In other words, the second portion 520P2 of the second quantum dot layer 520 may extend from the first portion 520P1 in a direction from the second sub-pixel opening 212 toward the first sub-pixel opening 211. When the second quantum dot layer 520 is formed in the 2-2 bank opening 542, the 1-2 portion 520b and the second portion 520P2 of the second quantum dot layer 520 may be formed in a space ensuring a shock margin. The second portion 520P2 of the second quantum dot layer 520 may be arranged adjacent to the first quantum dot layer 510.

[0177] In one embodiment, the first quantum dot layer 510 may overlap with the first sub-pixel opening 211 of the pixel-defining layer 210. In a plan view, the second portion 520P2 of the second quantum dot layer 520 may overlap with the first sub-pixel opening 211 of the pixel-defining layer 210. In other words, the first sub-pixel opening 211 of the pixel-defining layer 210 may overlap with the first quantum dot layer 510 and the second portion 520P2 of the second quantum dot layer 520. The first portion 520P1 of the second quantum dot layer 520 may overlap with the second sub-pixel opening 212 defined in the pixel-defining layer 210. In a plan view, the light-transmitting layer 530 may overlap with the third sub-pixel opening 213 defined in the pixel-defining layer 210.

[0178] The first quantum dot layer 510 may overlap with the 1-1 bank opening 451 defined in the first bank layer 450. The second portion 520P2 of the second quantum dot layer 520 may overlap with the 1-1 bank opening 451 defined in the first bank layer 450. In other words, the 1-1 bank opening 451 defined in the first bank layer 450 may overlap with the first quantum dot layer 510 and the second portion 520P2 of the second quantum dot layer 520. The first portion 520P1 of the second quantum dot layer 520 may overlap with the 1-2 bank opening 452 defined in the first bank layer 450. In a plan view, the light-transmitting layer 530 may overlap with the 1-3 bank opening 453.

[0179] refer to Figure 6 、 Figure 8B and Figure 9 , the second color filter 620 may have a third color filter opening 603 corresponding to the light-transmitting layer 530. The third color filter opening 603 defined in the second color filter 620 may overlap with the third sub-pixel opening 213 defined in the pixel-defining layer 210. The third color filter opening 603 defined in the second color filter 620 may define a region of the third sub-pixel PX3. In addition, the third color filter 630 may have a second color filter opening 602 corresponding to the first portion 520P1 of the second quantum dot layer 520. In a plan view, the second color filter opening 602 defined in the third color filter 630 may overlap with the second sub-pixel opening 212 defined in the pixel-defining layer 210. The second color filter opening 602 defined in the third color filter 630 may define a region of the second sub-pixel PX2.

[0180] Meanwhile, the third color filter 630 may have a first color filter opening 601 corresponding to the first quantum dot layer 510 and a fourth color filter opening 604 corresponding to the second portion 520P2 of the second quantum dot layer 520. In a plan view, the fourth color filter opening 604 may be arranged adjacent to the first color filter opening 601. The distance from the fourth color filter opening 604 to the first color filter opening 601 may be smaller than the distance from the fourth color filter opening 604 to the second color filter opening 602. In a plan view, the first color filter opening 601 and the fourth color filter opening 604 of the third color filter 630 may overlap with the first sub-pixel opening 211 defined in the pixel defining layer 210. The first color filter opening 601 and the fourth color filter opening 604 defined in the third color filter 630 may define an area included in the area of the first sub-pixel PX1.

[0181] The third color filter 630 may fill or cover the third color filter opening 603 defined in the second color filter 620. The first color filter 610 may fill the first color filter opening 601 defined in the third color filter 630. In one embodiment, referring to Figure 9 , the second color filter 620 may include a first color filter portion 620P1 and a second color filter portion 620P2. The first color filter portion 620P1 and the second color filter portion 620P2 of the second color filter 620 may contain the same composition. In the z-axis direction, the thickness d2 of the second color filter portion 620P2 of the second color filter 620 may be greater than the thickness d1 of the first color filter portion 620P1 of the second color filter 620. The second color filter 620 may be formed by using a halftone mask. The first color filter portion 620P1 of the second color filter 620 may fill the second color filter opening 602 defined in the third color filter 630. The second color filter portion 620P2 of the second color filter 620 may fill the fourth color filter opening 604 defined in the third color filter 630.

[0182] refer to Figure 9 In the region of the first subpixel PX1, light generated at the first subpixel opening 211 of the pixel defining layer 210 (e.g., light including blue light in the first wavelength band emitted from the first light-emitting element LED1) may move within the 1-1th bank opening 451 defined in the first bank layer 450 and may be incident on the first quantum dot layer 510 and the second portion 520P2 of the second quantum dot layer 520. The first red light Lm converted in the first quantum dot layer 510 and passing through the first color filter 610 (e.g., light passing through the first color filter 610 among the light in the second wavelength band converted in the first quantum dot layer 510) may be emitted from the first subpixel PX1. The second green light La converted in the second portion 520P2 of the second quantum dot layer 520 and passing through the second color filter portion 620P2 of the second color filter 620 (for example, light passing through the second color filter portion 620P2 of the second color filter 620 among the light in the third wavelength band converted in the second portion 520P2 of the second quantum dot layer 520) may be emitted from the first subpixel PX1. The light Lm' emitted from the region of the first subpixel PX1 may be a mixture of the first red light Lm and the second green light La.

[0183] At the same time, the color gamut of the display device 1 can be evaluated by the color gamut of the BT2020 standard and the color gamut of the Digital Cinema Initiative (DCI) standard. BT2020 is a standard proposed by the International Telecommunication Union (ITU), and the color gamut of the BT2020 standard can refer to the consistency of the color space of the display device with the color space based on BT2020 in CIE color coordinates. In addition, DCI is a standard for digital cinema projection in the American film industry, and the color gamut of the DCI standard can refer to the consistency of the color space of the display device with the color space based on DCI in CIE color coordinates.

[0184] The first quantum dot layer 510 of the display device 1 may be designed to emit red light having a high color gamut based on the BT2020 standard. However, according to one embodiment, without changing the material of the quantum dots such as the first quantum dot layer 510, green light emitted from a portion of the second quantum dot layer 520 (e.g., the second portion 520P2 of the second quantum dot layer 520) may pass through a color filter under appropriate conditions and may be mixed with the red light emitted from the first quantum dot layer 510 in the region of the first subpixel PX1, thereby improving the color gamut based on the DCI standard.

[0185] In one embodiment, the green light emitted from the second quantum dot layer 520 may have a wavelength band shorter than that of the green light to be mixed with the first red light Lm of the region of the first subpixel PX1 in order to improve a color gamut based on the DCI standard.

[0186] Figure 10 Graph showing light transmission spectra of the first filter portion 620P1 (labeled as “GCF”) of the second color filter 620 and the second filter portion 620P2 (labeled as “thick GCF”) of the second color filter 620. Figure 10 As shown in , the second filter portion 620P2 of the second filter 620 has a thickness greater than that of the first filter portion 620P1 of the second filter 620, so that the second green light La emitted from the second quantum dot layer 520 and passing through the second filter portion 620P2 of the second filter 620 can have a lower light efficiency than the green light passing through the first filter portion 620P1 of the second filter 620.

[0187] Figure 11 Shown along Figure 8A and Figure 8B The line I-I' is intercepted Figure 9 In the following, the main description is about the modified cross-sectional view of Figure 9 differences, and redundant descriptions are omitted.

[0188] refer to Figure 6 、 Figure 8B and Figure 11, the third color filter 630 may have a first color filter opening 601 corresponding to the first quantum dot layer 510 and a fourth color filter opening 604 corresponding to the second portion 520P2 of the second quantum dot layer 520. In a plan view, the fourth color filter opening 604 may be arranged adjacent to the first color filter opening 601. The distance from the fourth color filter opening 604 to the first color filter opening 601 may be smaller than the distance from the fourth color filter opening 604 to the second color filter opening 602. In a plan view, the first color filter opening 601 and the fourth color filter opening 604 of the third color filter 630 may overlap with the first sub-pixel opening 211 defined in the pixel defining layer 210. The first color filter opening 601 and the fourth color filter opening 604 defined in the third color filter 630 may define a region included in the region of the first sub-pixel PX1.

[0189] The third color filter 630 may fill or cover the third color filter opening 603 defined in the second color filter 620. The first color filter 610 may fill the first color filter opening 601 defined in the third color filter 630. In one embodiment, referring to Figure 6 and Figure 11 , the second color filter 620 can fill the second color filter opening 602. The fourth color filter 640 can fill the fourth color filter opening 604. The fourth color filter 640 can include a material different from the material of the second color filter 620. The light transmission spectrum of the fourth color filter 640 can be shifted toward longer wavelengths than the light transmission spectrum of the second color filter 620. For example, the fourth color filter 640 can transmit light from approximately 480 nm to approximately 620 nm. In order to form the fourth color filter 640, a new color filter material and a separate mask may be required. In one embodiment, the fourth color filter 640 can include a composition different from the composition of the second color filter 620.

[0190] refer to Figure 11In the region of the first subpixel PX1, light generated at the first subpixel opening 211 of the pixel defining layer 210 (e.g., light in the first wavelength band emitted from the first light-emitting element LED1, including blue light) can move within the 1-1st bank opening 451 defined in the first bank layer 450 and can be incident on the first quantum dot layer 510 and the second portion 520P2 of the second quantum dot layer 520. The first red light Lm converted in the first quantum dot layer 510 and passing through the first color filter 610 (e.g., light passing through the first color filter 610 among the light in the second wavelength band converted in the first quantum dot layer 510) can be emitted from the first subpixel PX1. The second green light La converted in the second portion 520P2 of the second quantum dot layer 520 and passing through the fourth color filter 640 (e.g., light passing through the fourth color filter 640 among the light in the third wavelength band converted in the second portion 520P2 of the second quantum dot layer 520) can be emitted from the first subpixel PX1. The light Lm′ emitted from the region of the first subpixel PX1 may be a mixture of the first red light Lm and the second green light La.

[0191] The first quantum dot layer 510 of the display device 1 may be designed to emit red light having a high color gamut based on the BT2020 standard. However, according to one embodiment, without changing the material of the quantum dots such as the first quantum dot layer 510, green light emitted from a portion of the second quantum dot layer 520 (e.g., the second portion 520P2 of the second quantum dot layer 520) may pass through a color filter under appropriate conditions and may be mixed with the red light emitted from the first quantum dot layer 510 in the region of the first subpixel PX1, thereby improving the color gamut based on the DCI standard.

[0192] In one embodiment, the green light emitted from the second quantum dot layer 520 may have a wavelength band shorter than that of the green light to be mixed with the first red light Lm of the region of the first subpixel PX1 in order to improve a color gamut based on the DCI standard.

[0193] Figure 12 Graph showing the transmission spectra of the second color filter 620 (labeled as “GCF”) and the fourth color filter 640 (labeled as “Long Wavelength Shift GCF”). Figure 12 As shown in , the second green light La emitted from the second quantum dot layer 520 and passing through the fourth color filter 640 may have a wavelength band having a longer wavelength than that of the green light passing through the first color filter portion 620P1 of the second color filter 620 .

[0194] Therefore, in the display device, the DCI-based color gamut of the light Lm′ emitted from the first subpixel PX1 may be excellent compared to the existing first red light Lm.

[0195] Figure 13Aand Figure 13B is a plan view schematically illustrating a portion of a display device according to an embodiment. Figure 13A A portion of the display device including the first to third sub-pixel electrodes 311 , 312 , and 313 , the pixel defining layer 210 , and the first bank layer 450 is shown. Figure 13B A portion of the display device including the second bank layer 540 , the first quantum dot layer 510 , the second quantum dot layer 520 , and the light-transmitting layer 530 is shown. Figure 14 It is along Figure 13A and Figure 13B A cross-sectional view taken along line II-II'. Figure 13A 、 Figure 13B and Figure 14 They are Figure 8A 、 Figure 8B and Figure 11 , and the following mainly describes the differences.

[0196] refer to Figure 6 、 Figure 13A 、 Figure 13B and Figure 14 , the second color filter 620 may have a third color filter opening 603 corresponding to the light-transmitting layer 530. In a plan view, the third color filter opening 603 defined in the second color filter 620 may overlap with the third sub-pixel opening 213 defined in the pixel-defining layer 210. The third color filter opening 603 defined in the second color filter 620 may define a region of the third sub-pixel PX3.

[0197] In addition, the third color filter 630 may have a second color filter opening 602 corresponding to the first portion 520P1 of the second quantum dot layer 520. The second color filter opening 602 defined in the third color filter 630 may overlap with the second sub-pixel opening 212 defined in the pixel defining layer 210. The second color filter opening 602 defined in the third color filter 630 may define the region of the second sub-pixel PX2.

[0198] At the same time, the third color filter 630 may have a first color filter opening 601' corresponding to the second portion 520P2 of the first quantum dot layer 510 and the second quantum dot layer 520. In other words, the first color filter opening 601' may overlap with the second portion 520P2 of the first quantum dot layer 510 and the second quantum dot layer 520. In a plan view, the first color filter opening 601' defined in the third color filter 630 may overlap with the first sub-pixel opening 211 defined in the pixel defining layer 210. The first color filter opening 601' defined in the third color filter 630 may define the region of the first sub-pixel PX1.

[0199] The third color filter 630 may fill or cover the third color filter opening 603 defined in the second color filter 620. The second color filter 620 may fill the second color filter opening 602 defined in the third color filter 630. The first color filter 610' may fill the first color filter opening 601' defined in the third color filter 630.

[0200] Figure 14 The first color filter 610' may include Figure 9 The composition of the first color filter 610 is different from the composition of the first color filter 610. Figure 14 The light transmission spectrum of the first color filter 610' may be greater than Figure 9 The light transmission spectrum of the first color filter 610 is shifted toward a shorter wavelength. For example, the first color filter 610 may transmit light of about 530 nm to about 780 nm.

[0201] refer to Figure 14 In the region of the first subpixel PX1, light generated at the first subpixel opening 211 of the pixel defining layer 210 (e.g., light in the first wavelength band emitted from the first light-emitting element LED1, including blue light) can move within the 1-1st bank opening 451 defined in the first bank layer 450 and can be incident on the first quantum dot layer 510 and the second portion 520P2 of the second quantum dot layer 520. First red light Lm converted in the first quantum dot layer 510 and passing through the first color filter 610' (e.g., light passing through the first color filter 610' among the light in the second wavelength band converted in the first quantum dot layer 510) can be emitted from the first subpixel PX1. Second green light La converted in the second portion 520P2 of the second quantum dot layer 520 and passing through the first color filter 610' (e.g., light passing through the first color filter 610' among the light in the third wavelength band converted in the second portion 520P2 of the second quantum dot layer 520) can be emitted from the first subpixel PX1. The light Lm′ emitted from the region of the first subpixel PX1 may be a mixture of the first red light Lm and the second green light La.

[0202] The first quantum dot layer 510 of the display device 1 may be designed to emit red light having a high color gamut based on the BT2020 standard. However, according to one embodiment, without changing the material of the quantum dots such as the first quantum dot layer 510, green light emitted from a portion of the second quantum dot layer 520 (e.g., the second portion 520P2 of the second quantum dot layer 520) may pass through a color filter under appropriate conditions and may be mixed with the red light emitted from the first quantum dot layer 510 in the region of the first subpixel PX1, thereby improving the color gamut based on the DCI standard.

[0203] In one embodiment, the green light emitted from the second quantum dot layer 520 may have a wavelength band shorter than that of the green light to be mixed with the first red light Lm of the region of the first subpixel PX1 in order to improve a color gamut based on the DCI standard.

[0204] Figure 15 It shows Figure 9 The first color filter 610 (labeled "RCF") and Figure 14 The transmission spectrum of the first color filter 610' (labeled as "short wavelength shift RCF") is shown in FIG. Figure 15 As shown in FIG, the first color filter 610′ may be thinner than the first color filter 610 (see FIG. Figure 9 ) transmits light in a wavelength band of short wavelengths. The first color filter 610′ can transmit some of the red light emitted from the first quantum dot layer 510 and the green light emitted from the second portion 520P2 of the second quantum dot layer 520. The second green light La that passes through the first color filter 610′ can correspond to light belonging to a wavelength band of long wavelengths among the green light emitted from the second quantum dot layer 520.

[0205] Figure 16 A cross-sectional view illustrating a display device according to an embodiment is shown. Figure 16 yes Figure 14 and mainly describes the Figure 14 difference.

[0206] refer to Figure 6 and Figure 16 , a filter layer 750 may be further provided between the color filter layer 600 and the second substrate 700, wherein the color filter layer 600 includes a first color filter 610', a second color filter 620, and a third color filter 630. The filter layer 750 may be provided on the entire color filter layer 600 (eg, the entire surface of the color filter layer 600). Figure 15 When the light transmission spectrum of the first color filter 610' shifts toward shorter wavelengths, the first color filter 610' may transmit some green light and yellow light. The filter layer 750 may filter this yellow light. For example, the filter layer 750 may transmit light between approximately 530 nm and approximately 780 nm. The filter layer 750 may increase the reflectivity of the display device.

[0207] Figure 17A and Figure 17B is a plan view schematically illustrating a portion of a display device according to an embodiment. Figure 17A A portion of the display device including the first to third sub-pixel electrodes 311 , 312 , and 313 , the pixel defining layer 210 , and the first bank layer 450 is shown. Figure 17B A portion of the display device including the second bank layer 540 , the first quantum dot layer 510 , the second quantum dot layer 520 , and the light-transmitting layer 530 is shown. Figure 18 It is along Figure 17A and Figure 17B A cross-sectional view taken along line III-III'. Figure 17A 、 Figure 17B and Figure 18 They are Figure 8A 、 Figure 8B and Figure 9 , and the following mainly describes the differences.

[0208] refer to Figure 17A and Figure 17B In one embodiment, the first quantum dot layer 510 may overlap with the first sub-pixel opening 211' of the pixel defining layer 210. The second portion 520P2 of the second quantum dot layer 520 may not overlap with the first sub-pixel opening 211' of the pixel defining layer 210. In other words, the first sub-pixel opening 211' of the pixel defining layer 210 may overlap only with the first quantum dot layer 510 and may not overlap with the second quantum dot layer 520 (e.g., the second portion 520P2 of the second quantum dot layer 520). The first portion 520P1 of the second quantum dot layer 520 may overlap with the second sub-pixel opening 212 defined in the pixel defining layer 210. In a plan view, the light-transmitting layer 530 may overlap with the third sub-pixel opening 213 defined in the pixel defining layer 210.

[0209] The first quantum dot layer 510 may overlap with the 1-1 bank opening 451 defined in the first bank layer 450. The second portion 520P2 of the second quantum dot layer 520 may overlap with the 1-1 bank opening 451 defined in the first bank layer 450. In other words, the 1-1 bank opening 451 defined in the first bank layer 450 may overlap with the first quantum dot layer 510 and the second portion 520P2 of the second quantum dot layer 520. The first portion 520P1 of the second quantum dot layer 520 may overlap with the 1-2 bank opening 452 defined in the first bank layer 450. In a plan view, the light-transmitting layer 530 may overlap with the 1-3 bank opening 453.

[0210] refer to Figure 6 、 Figure 17B and Figure 18 , the second color filter 620 may have a third color filter opening 603 corresponding to the light-transmitting layer 530. The third color filter opening 603 defined in the second color filter 620 may overlap with the third sub-pixel opening 213 defined in the pixel-defining layer 210. The third color filter opening 603 defined in the second color filter 620 may define the region of the third sub-pixel PX3.

[0211] In addition, the third color filter 630 may have a second color filter opening 602 corresponding to the first portion 520P1 of the second quantum dot layer 520. In a plan view, the second color filter opening 602 defined in the third color filter 630 may overlap with the second sub-pixel opening 212 defined in the pixel defining layer 210. The second color filter opening 602 defined in the third color filter 630 may define the region of the second sub-pixel PX2.

[0212] At the same time, the third color filter 630 may have a first color filter opening 601" corresponding to the first quantum dot layer 510. In a plan view, the first color filter opening 601" may be arranged adjacent to the second portion 520P2 of the second quantum dot layer 520. In a plan view, the first color filter opening 601" defined in the third color filter 630 may overlap with the first sub-pixel opening 211' defined in the pixel defining layer 210. The first color filter opening 601" defined in the third color filter 630 may define the area of the first sub-pixel PX1.

[0213] The third color filter 630 may fill or cover the third color filter opening 603 defined in the second color filter 620. The second color filter 620 may fill the second color filter opening 602 defined in the third color filter 630. The first color filter 610" may fill the first color filter opening 601" defined in the third color filter 630.

[0214] In one embodiment, the second portion 520P2 of the second quantum dot layer 520 may correspond to a light-shielding portion overlapping the first color filter 610", the second color filter 620 and the third color filter 630. For example, at least two selected from the first color filter 610", the second color filter 620 and the third color filter 630 may overlap with each other in a specific portion, which may define the light-shielding portion, and the second portion 520P2 of the second quantum dot layer 520 may overlap with the light-shielding portion in a plan view.

[0215] Figure 18 The first color filter 610" may include Figure 9 The composition of the first color filter 610 is different from the composition of the first color filter 610. Figure 18 The light transmission spectrum of the first color filter 610" may be compared to Figure 9 The light transmission spectrum of the first color filter 610 is shifted toward shorter wavelengths. For example, the first color filter 610 ″ may transmit light of approximately 530 nm to approximately 780 nm.

[0216] refer to Figure 18, in the region of the first subpixel PX1, light generated at the first subpixel opening 211′ of the pixel defining layer 210 (e.g., light including blue light in the first wavelength band emitted from the first light-emitting element LED1) may move within the 1-1st bank opening 451 defined in the first bank layer 450 and may be incident on the first quantum dot layer 510. In addition, a high angular component of the light generated at the first subpixel opening 211′ (when the direction of the light component forms an angle greater than a predetermined angle (e.g., 45 degrees) with respect to the normal direction (z-axis direction) of the xy plane (the main surface of the first subpixel electrode 311)) may move within the 1-1st bank opening 451 defined in the first bank layer 450 and may be incident on the second portion 520P2 of the second quantum dot layer 520. The first red light Lm converted in the first quantum dot layer 510 and passing through the first color filter 610″ (for example, light passing through the first color filter 610″ among the light in the second wavelength band converted in the first quantum dot layer 510) can be emitted from the area of the first subpixel PX1. The second green light La converted in the second part 520P2 of the second quantum dot layer 520, reflected from the light-shielding part and passing through the first color filter 610″ (for example, light passing through the first color filter 610″ among the light in the third wavelength band converted in the second part 520P2 of the second quantum dot layer 520) can be emitted from the area of the adjacent first subpixel PX1. The light Lm' emitted from the area of the first subpixel PX1 may be a mixture of the first red light Lm and the second green light La.

[0217] The first quantum dot layer 510 of the display device 1 may be designed to emit red light having a high color gamut based on the BT2020 standard. However, according to one embodiment, without changing the material of the quantum dots such as the first quantum dot layer 510, green light emitted from a portion of the second quantum dot layer 520 (e.g., the second portion 520P2 of the second quantum dot layer 520) may pass through a color filter under appropriate conditions and may be mixed with the red light emitted from the first quantum dot layer 510 in the region of the first subpixel PX1, thereby improving the color gamut based on the DCI standard.

[0218] In one embodiment, the green light emitted from the second quantum dot layer 520 may have a wavelength band shorter than that of the green light to be mixed with the first red light Lm of the region of the first subpixel PX1 , thereby improving a color gamut based on the DCI standard.

[0219] The first color filter 610" may be thicker than the first color filter 610 (see Figure 9) transmits light in a wavelength band of short wavelengths. The first color filter 610″ can transmit some of the red light emitted from the first quantum dot layer 510 and the green light emitted from the second portion 520P2 of the second quantum dot layer 520. The second green light La passing through the first color filter 610″ can correspond to the light belonging to the wavelength band of long wavelengths among the green light emitted from the second quantum dot layer 520.

[0220] Figure 19 This is a graph schematically illustrating the color space of a display device according to an embodiment, in which the red portion is amplified, and the Digital Cinema Initiative (DCI) color space. The DCI color space is indicated by a black solid line, the BT2020 color space is indicated by a thin solid line, and the color space displayed in the display device according to the embodiment is indicated by symbols ① and ②. In addition, the color space displayed in the display device according to the comparative example is indicated by a dotted line.

[0221] refer to Figure 19 , in the red part, the BT2020 color space and the DCI color space may be different from each other. The closer the color space of the display device is to the BT2020 color space, the higher the color gamut based on the BT2020 standard, and the color gamut based on the DCI standard may be reduced. The closer the color space of the display device is to the DCI color space, the higher the color gamut based on the DCI standard, and the color gamut based on the BT2020 standard may be reduced. In the color coordinates in which the horizontal axis is u' and the vertical axis is v', the closer the value of u' corresponding to the red color space of the display device is to the value of u' corresponding to red in the DCI color space, the better the color gamut based on the DCI standard that can be obtained. The closer the value of v' corresponding to the red color space of the display device is to the value of v' corresponding to red in the DCI color space, the better the color gamut based on the DCI standard that can be obtained.

[0222] In the display device according to the comparative example, only red light emitted from the first quantum dot layer may be emitted from the region of the first sub-pixel. The first quantum dot layer may be designed to emit light having a high color gamut based on the BT2020 standard.

[0223] However, in a display device according to one or more embodiments, a portion of the second quantum dot layer 520 (e.g., the second portion 520P2 of the second quantum dot layer 520) corresponds to the area of the first subpixel PX1, or is arranged adjacent to the area of the first subpixel PX1, and the green light emitted from the portion of the second quantum dot layer 520 (e.g., the second portion 520P2 of the second quantum dot layer 520) passes through a color filter under appropriate conditions and mixes with the red light emitted from the first quantum dot layer 510 in the area of the first subpixel PX1.

[0224] like Figure 19As shown in , the color space of the display device according to one or more embodiments is closer to the DCI color space than the color space of the display device according to the comparative example. According to one embodiment, the color gamut of the display device based on the DCI standard can be improved without changing the material such as quantum dots of the first quantum dot layer 510.

[0225] According to one or more embodiments, a display device having excellent color purity and excellent light efficiency can be provided. However, the scope of one or more embodiments is not limited by these effects.

[0226] It should be understood that the embodiments described herein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each embodiment should generally be considered applicable to other similar features or aspects in other embodiments. Although one or more embodiments have been described with reference to the drawings, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A display device, comprising: a first substrate; First to third light-emitting elements are disposed on the first substrate; a sub-pixel defining layer, defining first to third openings in the sub-pixel defining layer, wherein in a plan view, the first to third openings overlap with the first to third light-emitting elements, respectively; an encapsulation layer, disposed on the sub-pixel defining layer and comprising at least one inorganic encapsulation layer and at least one organic encapsulation layer; a functional layer, disposed on the encapsulation layer, the functional layer comprising a first quantum dot layer corresponding to the first light-emitting element and a second quantum dot layer corresponding to the second light-emitting element; as well as a color filter layer, provided in a direction of light output from the first light-emitting element to the third light-emitting element, the color filter layer including a first color filter corresponding to the first light-emitting element, a second color filter corresponding to the second light-emitting element, and a third color filter corresponding to the third light-emitting element; In the plan view, the second quantum dot layer includes a first portion overlapping the second opening and a second portion extending from the first portion in a direction from the second opening to the first opening, and the second portion is adjacent to the first quantum dot layer.

2. The display device according to claim 1 , further comprising a dam layer, the dam layer being disposed between the sub-pixel defining layer and the encapsulation layer, and defining 1-1 to 1-3 dam openings respectively overlapping with the first to third light-emitting elements in the plan view in the dam layer. wherein the embankment layer comprises a light-shielding material, and The second portion of the second quantum dot layer overlaps the 1-1th bank opening in the plan view.

3. The display device according to claim 1, further comprising: a second substrate arranged to face the first substrate; a low-refractive layer arranged to cover the color filter layer, the color filter layer being provided on a surface of the second substrate; as well as The filler is arranged between the low-refractive layer and the functional layer. 4 . The display device according to claim 1 , wherein the second portion of the second quantum dot layer overlaps with the first opening in the plan view.

5. The display device according to claim 4 , wherein the color filter layer further comprises a fourth color filter, the fourth color filter overlapping the second portion of the second quantum dot layer in the plan view, The second color filter overlaps the first portion of the second quantum dot layer in the plan view, and The fourth color filter includes a composition different from a composition of the second color filter.

6. The display device according to claim 4 , wherein the second color filter includes a first color filter portion overlapping the first portion of the second quantum dot layer and a second color filter portion overlapping the second portion of the second quantum dot layer in the plan view, The second color filter portion comprises the same composition as the first color filter portion, and The thickness of the second color filter portion is greater than the thickness of the first color filter portion. 7 . The display device of claim 4 , wherein the first color filter overlaps the second portion of the second quantum dot layer in the plan view. 8 . The display device according to claim 7 , further comprising a light filter layer provided on the entire color filter layer. 9 . The display device according to claim 1 , wherein the second portion of the second quantum dot layer does not overlap with the first opening in the plan view.

10. The display device according to claim 9, wherein at least two selected from the first color filter, the second color filter, and the third color filter overlap each other in a specific portion, and the specific portion defines a light shielding portion, and The second portion of the second quantum dot layer overlaps with the light shielding portion in the plan view. 11 . The display device according to claim 1 , wherein the first to third light-emitting elements include an emission layer of a first color and an emission layer of a second color.

12. A display device comprising: a first substrate; First to third light-emitting elements are disposed on the first substrate; a sub-pixel defining layer, defining first to third openings in the sub-pixel defining layer, wherein in a plan view, the first to third openings overlap with the first to third light-emitting elements, respectively; a bank layer disposed on the sub-pixel defining layer, and defining a 1-1 bank opening to a 1-3 bank opening respectively overlapping with the first light-emitting element to the third light-emitting element in the plan view in the bank layer; an encapsulation layer, disposed on the bank layer and comprising at least one inorganic encapsulation layer and at least one organic encapsulation layer; a functional layer, disposed on the encapsulation layer, the functional layer comprising a first quantum dot layer corresponding to the first light-emitting element and a second quantum dot layer corresponding to the second light-emitting element; as well as a color filter layer, provided in a direction of light output from the first light-emitting element to the third light-emitting element, the color filter layer including a first color filter corresponding to the first light-emitting element, a second color filter corresponding to the second light-emitting element, and a third color filter corresponding to the third light-emitting element; The second quantum dot layer overlaps with the 1-1th bank opening in the plan view. The display device according to claim 12 , wherein the bank layer comprises a light-shielding material.

14. The display device according to claim 12, wherein in the plan view, the second quantum dot layer includes a first portion overlapping with the second opening and a second portion extending from the first portion in a direction from the second opening to the first opening, and the second portion is adjacent to the first quantum dot layer. 15 . The display device according to claim 14 , wherein the second portion of the second quantum dot layer overlaps with the first opening in the plan view.

16. The display device according to claim 15, wherein the color filter layer further comprises a fourth color filter, the fourth color filter overlapping the second portion of the second quantum dot layer in the plan view, The second color filter overlaps the first portion of the second quantum dot layer in the plan view, and The fourth color filter includes a composition different from a composition of the second color filter.

17. The display device according to claim 15 , wherein the second color filter comprises a first color filter portion overlapping the first portion of the second quantum dot layer and a second color filter portion overlapping the second portion of the second quantum dot layer in the plan view, The second color filter portion comprises the same composition as the first color filter portion, and The thickness of the second color filter portion is greater than the thickness of the first color filter portion. 18 . The display device of claim 15 , wherein the first color filter overlaps the second portion of the second quantum dot layer in the plan view. 19 . The display device according to claim 14 , wherein the second portion of the second quantum dot layer does not overlap with the first opening in the plan view.

20. The display device according to claim 19, wherein at least two selected from the first color filter, the second color filter, and the third color filter overlap each other in a specific portion, and the specific portion defines a light shielding portion, and The second portion of the second quantum dot layer overlaps with the light shielding portion in the plan view.

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