Optical member and display panel

Abstract

A display panel according to one embodiment of the present invention comprises a first electrode, a light-emitting layer disposed on the first electrode and a second electrode disposed on the light-emitting layer, a light-emitting element that outputs source light, a light-control layer disposed on the light-emitting element and comprising a first light-control pattern that converts the source light into a first light and a second light-control pattern that transmits the source light, and a color filter layer disposed on the light-control layer and comprising a first color filter that overlaps the first light-control pattern and a second color filter that overlaps the second light-control pattern, wherein the light transmittance of the first color filter in a wavelength range of 600 nm to 640 nm is 70% or less, and the light transmittance of the second color filter in a wavelength range of 430 nm to 470 nm is 75% or less. Accordingly, the reflectance of the display panel of one embodiment is reduced, and the color reproduction rate can be improved.

Description

Technology Field

[0001] The present invention relates to an optical member and a display panel, and more specifically, to an optical member and a display panel having reduced reflectivity and improved color reproduction rate. Background Technology

[0002] The display panel includes a transmissive display panel that selectively transmits source light generated from a light source, and an emissive display panel that generates source light within the display panel itself. The display panel may include different types of light control patterns depending on the pixels to generate a color image. The light control patterns may transmit only a portion of the wavelength range of the source light or change the color of the source light. Some light control patterns may change the characteristics of the light without changing the color of the source light. The problem to be solved

[0003] The present invention aims to provide an optical member with reduced external light reflectance and improved color reproduction rate.

[0004] The present invention aims to provide a display panel having excellent color quality by reducing the reflectance of external light on the surface of the display panel and improving the color reproduction rate. means of solving the problem

[0005] A display panel according to one embodiment of the present invention comprises a first electrode, a light-emitting layer disposed on the first electrode and a second electrode disposed on the light-emitting layer, a light-emitting element that outputs source light, a light-emitting layer disposed on the light-emitting element and comprising a first light-control pattern that converts the source light into a first light and a second light-control pattern that transmits the source light, and a color filter layer disposed on the light-control layer and comprising a first color filter that overlaps the first light-control pattern and a second color filter that overlaps the second light-control pattern, wherein the light transmittance of the first color filter in a wavelength range of 600 nm or more and 640 nm or less is 70% or less, and the light transmittance of the second color filter in a wavelength range of 430 nm or more and 470 nm or less is 75% or less.

[0006] The first color filter above may include a point where the light transmittance is 10% in a wavelength range greater than 590 nm and less than or equal to 610 nm.

[0007] The first color filter above may have a transmittance of less than 10% in a wavelength range of 590 nm or less.

[0008] The transmittance of the first color filter and the second color filter may be measured using an LCF-2100QD spectrometer.

[0009] The full width at half maximum of the light transmittance spectrum of the second color filter above may be 95 nm or less.

[0010] The wavelength of the first light is longer than the wavelength of the source light, and the first light control pattern may include a first quantum dot that converts the source light into the first light.

[0011] The first color filter above may include a red pigment, and the second color filter may include a blue pigment.

[0012] The first color filter further includes a black pigment, and the black pigment may be included in an amount of 1% by weight or less relative to the total weight of the red pigment and the black pigment.

[0013] The second color filter further includes a purple pigment, and the weight ratio of the blue pigment and the purple pigment may be 70:30 to 80:20.

[0014] The thickness of the first color filter may be 3 micrometers or more and 5.5 micrometers or less, and the thickness of the second color filter may be 1.8 micrometers or more and 4.2 micrometers or less.

[0015] A display panel according to one embodiment of the present invention may further include a base substrate disposed below the light-emitting element layer and a base layer disposed on the color filter layer.

[0016] A display panel according to one embodiment of the present invention may further include an anti-reflection layer disposed on the base layer.

[0017] The light-emitting element layer can receive unpolarized incident light from the upper part of the anti-reflection layer.

[0018] The color filter layer further includes a low-refractive index layer disposed between the first color filter and the second color filter and the light control layer, and the refractive index of the low-refractive index layer may be 1.3 or less.

[0019] The light-emitting element may include a plurality of light-emitting stacks, each of which is disposed between the first electrode and the second electrode and includes the light-emitting layer.

[0020] The plurality of light-emitting stacks comprises a first light-emitting stack disposed on the first electrode and including a first light-emitting layer, a charge-generating layer disposed on the first stack, and a second stack disposed on the charge-generating layer and including a second light-emitting layer, wherein the first light-emitting layer can emit light of a color different from that of the second light-emitting layer.

[0021] An optical member according to one embodiment of the present invention comprises a light control layer comprising a first light control pattern including quantum dots that convert the wavelength of incident light and a second light control pattern that transmits the incident light, and a color filter layer disposed on the light control layer and comprising a first color filter superimposed on the first light control pattern and a second color filter superimposed on the second light control pattern, wherein the light transmittance of the first color filter in a wavelength range of 600 nm or more and 640 nm or less is 70% or less, and the light transmittance of the second color filter in a wavelength range of 430 nm or more and 470 nm or less is 75% or less.

[0022] The thickness of the first color filter may be greater than the thickness of the second color filter.

[0023] A display panel according to one embodiment of the present invention comprises a lower panel including a display element layer and an encapsulation layer disposed on the display element layer, an upper panel disposed on the lower panel, and a filling layer disposed between the lower panel and the upper panel, wherein the upper panel is disposed on the filling layer and comprises a light control layer including a first light control pattern that converts the source light into a first light and a second light control pattern that transmits the source light, a color filter layer disposed on the light control layer and comprising a first color filter that overlaps the first light control pattern and a second color filter that overlaps the second light control pattern, and wherein the thickness of the first color filter is 3 micrometers or more and 5.5 micrometers or less, and the thickness of the second color filter is 1.8 micrometers or more and 4.2 micrometers or less. Effects of the invention

[0024] According to an optical member of one embodiment of the present invention and a display panel including the same, by adjusting the transmittance of a color filter at the peak wavelength of light provided from a light source, the light transmittance in an adjacent wavelength range, the full width at half maximum, etc., to a level below a certain range, the transmittance efficiency can be optimized while the reflectance is lowered and the color reproduction rate is improved, thereby providing a display panel having excellent color quality. Brief explanation of the drawing

[0025] FIG. 1a is a perspective view of a display panel according to one embodiment of the present invention. FIG. 1b is a cross-sectional view of a display panel according to one embodiment of the present invention. FIG. 1c is a plan view of a display panel according to one embodiment of the present invention. FIG. 2a is an enlarged plan view of a portion of a display panel according to one embodiment of the present invention. FIG. 2b is a cross-sectional view of a display panel according to one embodiment of the present invention. FIG. 2c is an enlarged view of a portion of the cross-section of a display panel according to one embodiment of the present invention. FIG. 3 is a cross-sectional view of a light-emitting element included in a display panel according to one embodiment of the present invention. FIG. 4a illustrates a graph of light transmittance of a first color filter included in a display panel according to one embodiment of the present invention, a graph of light transmittance of a color filter of a comparative example, and a graph of light transmittance of light emitted from a light source of one embodiment. FIG. 4b illustrates a graph of light transmittance of a second color filter included in a display panel according to one embodiment of the present invention, and a graph of light transmittance of a color filter of a comparative example. Specific details for implementing the invention

[0026] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0027] In this specification, where a component (or region, layer, part, etc.) is described as being "on," "connected," or "combined" with another component, it means that it may be directly connected / combined with the other component or that a third component may be placed between them.

[0028] Identical reference numerals denote identical components. Additionally, in the drawings, the thicknesses, proportions, and dimensions of the components are exaggerated for the effective illustration of the technical content. "And / or" includes all one or more combinations that the associated components may define.

[0029] Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. A singular expression includes a plural expression unless the context clearly indicates otherwise.

[0030] Additionally, terms such as "below," "lower side," "above," and "upper side" are used to describe the relationships between the components depicted in the drawings. These terms are relative concepts and are described based on the directions indicated in the drawings.

[0031] Terms such as "include" or "have" are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0032] In this specification, "directly placed" may mean that there are no additional layers, films, regions, plates, etc. between a part such as a layer, film, region, or plate and another part. For example, "directly placed" may mean placing two layers or two members without using additional members such as adhesive members between them.

[0033] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Furthermore, terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an overly ideal or overly formal sense unless explicitly defined herein.

[0034] Hereinafter, a display panel according to an embodiment of the present invention will be described with reference to the drawings.

[0035] FIG. 1a is a perspective view of a display panel according to an embodiment of the present invention. FIG. 1b is a cross-sectional view of a display panel according to an embodiment of the present invention. FIG. 1c is a plan view of a display panel according to an embodiment of the present invention.

[0036] As illustrated in FIG. 1a, a display panel (DP) can display an image through a display surface (DP-IS). The display surface (DP-IS) is parallel to the plane defined by the first direction (DR1) and the second direction (DR2). The display surface (DP-IS) may include a display area (DA) and a non-display area (NDA). Pixels (PX) are placed in the display area (DA), and pixels (PX) are not placed in the non-display area (NDA). The non-display area (NDA) is defined along the border of the display surface (DP-IS). The non-display area (NDA) may surround the display area (DA). However, it is not limited thereto, and in one embodiment of the present invention, the non-display area (NDA) may be omitted or placed only on one side of the display area (DA).

[0037] The normal direction of the display surface (DP-IS), that is, the thickness direction of the display panel (DP), is indicated by the third direction (DR3). The front (or top) and back (or bottom) surfaces of each layer or unit described below are distinguished by the third direction (DR3). However, the first to third directions (DR1, DR2, DR3) illustrated in this embodiment are merely examples.

[0038] In one embodiment of the present invention, a display panel (DP) having a planar display surface (DP-IS) is illustrated, but is not limited thereto. The display panel (DP) may include a curved display surface or a three-dimensional display surface. The three-dimensional display surface may include a plurality of display areas indicating different directions.

[0039] As illustrated in FIG. 1b, a display panel (DP) comprises a base substrate (BS), a circuit element layer (DP-CL), a display element layer (DP-LED), and an optical structure layer (OSL). The base substrate (BS) may include a synthetic resin substrate or a glass substrate. The circuit element layer (DP-CL) includes at least one insulating layer and a circuit element. The circuit element includes signal lines, pixel driving circuits, etc. The circuit element layer (DP-CL) may be formed through a process of forming an insulating layer, a semiconductor layer, and a conductive layer by coating, deposition, etc., and a patterning process of the insulating layer, semiconductor layer, and conductive layer by photolithography. The display element layer (DP-LED) includes at least one display element. The optical structure layer (OSL) can convert the color of light provided from the display element. The optical structure layer (OSL) may include a light control pattern and a structure for increasing the light conversion efficiency.

[0040] FIG. 1c illustrates the planar arrangement relationship of signal lines (GL1 to GLn, DL1 to DLm) and pixels (PX11 to PXnm). The signal lines (GL1 to GLn, DL1 to DLm) may include a plurality of gate lines (GL1 to GLn) and a plurality of data lines (DL1 to DLm).

[0041] Each of the pixels (PX11 to PXnm) is connected to a corresponding gate line among a plurality of gate lines (GL1 to GLn) and a corresponding data line among a plurality of data lines (DL1 to DLm). Each of the pixels (PX11 to PXnm) may include a pixel driving circuit and a display element. Depending on the configuration of the pixel driving circuit of the pixels (PX11 to PXnm), more types of signal lines may be provided on the display panel (DP).

[0042] Pixels in a matrix form (PX11 to PXnm) are illustrated exemplarily but are not limited thereto. The pixels (PX11 to PXnm) are Pentile® It can be arranged in the form of a diamond. For example, the points where pixels (PX11 to PXnm) are arranged may correspond to the vertices of a diamond. The gate driver circuit (GDC) can be integrated into a display panel (DP) through an OSG (oxide silicon gate driver circuit) or ASG (amorphose silicon gate driver circuit) process.

[0043] FIG. 2a is an enlarged plan view of a portion of a display panel according to an embodiment of the present invention. FIG. 2a exemplarily illustrates a plane including three pixel regions (PXA-R, PXA-B, PXA-G) and an adjacent bank well region (BWA) in a display panel (DP) of an embodiment. In an embodiment of the present invention, the three types of pixel regions (PXA-R, PXA-B, PXA-G) shown in FIG. 2a may be repeatedly arranged throughout a display area (DA, FIG. 1a).

[0044] A peripheral region (NPXA) is disposed around the first to third pixel regions (PXA-R, PXA-B, PXA-G). The peripheral region (NPXA) defines the boundaries of the first to third pixel regions (PXA-R, PXA-B, PXA-G). The peripheral region (NPXA) may surround the first to third pixel regions (PXA-R, PXA-B, PXA-G). A structure that prevents color mixing between the first to third pixel regions (PXA-R, PXA-B, PXA-G), such as a pixel defining film (PDL, see FIG. 2b) or a bank (BMP, see FIG. 2b), may be disposed in the peripheral region (NPXA).

[0045] In FIG. 2a, first to third pixel regions (PXA-R, PXA-B, PXA-G) having identical planar shapes and different planar areas are illustrated as examples, but are not limited thereto. At least two of the first to third pixel regions (PXA-R, PXA-B, PXA-G) may have the same area. The areas of the first to third pixel regions (PXA-R, PXA-B, PXA-G) may be set according to the light-emitting color. Among the primary colors, the pixel region emitting red light may have the largest area, and the pixel region emitting blue light may have the smallest area.

[0046] In FIG. 2a, the first to third pixel regions (PXA-R, PXA-B, PXA-G) are shown as rectangular, but are not limited thereto. In a planar view, the first to third pixel regions (PXA-R, PXA-B, PXA-G) may have polygonal shapes of other shapes, such as a rhombus or a pentagon (including substantial polygonal shapes). In one embodiment, the first to third pixel regions (PXA-R, PXA-B, PXA-G) may have a rectangular shape with rounded corners in a planar view (substantial rectangular shape).

[0047] In FIG. 2a, the third pixel region (PXA-G) is exemplarily shown in which the first pixel region (PXA-R) and the second pixel region (PXA-B) are oriented in the first row, but is not limited thereto and the arrangement of the first to third pixel regions (PXA-R, PXA-B, PXA-G) can be varied. For example, the first to third pixel regions (PXA-R, PXA-B, PXA-G) may be oriented in the same row.

[0048] One of the first to third pixel regions (PXA-R, PXA-B, PXA-G) provides a second light corresponding to a portion of the source light, another provides a first light different from the second light, and the remaining one provides a third light different from the first light and the second light. In this embodiment, the second pixel region (PXA-B) provides a second light corresponding to a portion of the source light. In this embodiment, the first pixel region (PXA-R) may provide red light, the second pixel region (PXA-B) may provide blue light, and the third pixel region (PXA-G) may provide green light.

[0049] A bank well region (BWA) may be defined in the display area (DA, FIG. 1a). The bank well region (BWA) may be an area in which a bank well (BW, FIG. 5) is formed to prevent defects caused by mis-deposition during the process of patterning a plurality of light control patterns (CCP-R, CCP-B, CCP-G, FIG. 2c) included in the light control layer (CCL, FIG. 2c). That is, the bank well region (BWA) may be an area in which a bank well is defined formed by removing a part of a bank (BMP, FIG. 2c).

[0050] FIG. 2a illustrates, by way of example, that two bank well regions (BWA) are defined adjacent to the third pixel region (PXA-G), but is not limited thereto and the shape and arrangement of the bank well regions (BWA) can be varied.

[0051] FIG. 2b is a cross-sectional view of a display panel according to an embodiment of the present invention. FIG. 2c is an enlarged view of a portion of the cross-section of a display panel according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of a light-emitting element included in a display panel according to an embodiment of the present invention. FIG. 2b shows a cross-section corresponding to the II' cutting line of FIG. 2a. FIG. 2c shows a cross-section corresponding to the II-II' cutting line of FIG. 2a.

[0052] Referring to FIG. 2b, a display panel (DP) of one embodiment may include a base substrate (BS), a circuit element layer (DP-CL) disposed on the base substrate (BS), and a display element layer (DP-LED) disposed on the circuit element layer (DP-CL). In this specification, the base substrate (BS), the circuit element layer (DP-CL), and the display element layer (DP-LED) may be collectively referred to as a lower panel, a lower display substrate, or a display member.

[0053] The base substrate (BS) may be a member that provides a reference surface on which the components included in the circuit element layer (DP-CL) are placed. In one embodiment, the base substrate (BS) may be a glass substrate, a metal substrate, a polymer substrate, etc. However, the embodiment is not limited thereto, and the base substrate (BS) may be an inorganic layer, a functional layer, or a composite material layer.

[0054] The base substrate (BS) may have a multilayer structure. For example, the base substrate (BS) may have a three-layer structure comprising a polymer resin layer, a barrier layer, and a polymer resin layer. In particular, the polymer resin layer may include a polyimide-based resin. Additionally, the polymer resin layer may include at least one of an acrylate-based resin, a methacrylate-based resin, a polyisoprene-based resin, a vinyl-based resin, an epoxy-based resin, a urethane-based resin, a cellulose-based resin, a siloxane-based resin, a polyamide-based resin, and a perylene-based resin. Meanwhile, in this specification, "~~-based" resin means that it includes a functional group of "~~". Meanwhile, the barrier layer may be an inorganic layer comprising an inorganic material.

[0055] The circuit element layer (DP-CL) can be placed on a base substrate (BS). The circuit element layer (DP-CL) may include a transistor (TD) as a circuit element. The configuration of the circuit element layer (DP-CL) may vary depending on the design of the driving circuit of the pixel (PX, see FIG. 1a), and FIG. 2b illustrates an exemplary transistor (TD). An exemplary arrangement relationship of the active (AD), source (SD), drain (DD), and gate (GD) constituting the transistor (TD) is illustrated. The active (AD), source (SD), and drain (DD) may be regions distinguished according to the doping concentration or conductivity of the semiconductor pattern.

[0056] The circuit element layer (DP-CL) may include a lower buffer layer (BRL), a first insulating layer (10), a second insulating layer (20), and a third insulating layer (30) disposed on a base substrate (BS). For example, the lower buffer layer (BRL), the first insulating layer (10), and the second insulating layer (20) may be inorganic layers, and the third insulating layer (30) may be an organic layer.

[0057] The display element layer (DP-LED) may include a light-emitting element (LED) as a display element. The light-emitting element (LED) may generate the source light described above. The light-emitting element (LED) includes a first electrode (EL1), a second electrode (EL2), and a light-emitting layer (EML) disposed between them. In this embodiment, the display element layer (DP-LED) may include an organic light-emitting diode as a light-emitting element. In one embodiment of the present invention, the light-emitting element may include a quantum dot light-emitting diode. That is, the light-emitting layer (EML) included in the light-emitting element (LED) may include an organic light-emitting material as a light-emitting material, or the light-emitting layer (EML) may include quantum dots as a light-emitting material. Alternatively, in this embodiment, the display element layer (DP-LED) may include a micro-light-emitting element described later as a light-emitting element. The micro-light-emitting element may include, for example, a micro-LED element and / or a nano-LED element. A micro-sized light-emitting device may have a size of micro or nano scale and may be a light-emitting device comprising an active layer disposed between a plurality of semiconductor layers.

[0058] A first electrode (EL1) is placed on the third insulating layer (30). The first electrode (EL1) can be connected directly or indirectly to a transistor (TD), and the connection structure between the first electrode (EL1) and the transistor (TD) is not shown in FIG. 2b.

[0059] The display element layer (DP-LED) includes a pixel defining layer (PDL). For example, the pixel defining layer (PDL) may be an organic layer. A light-emitting opening (OH, see FIG. 2c) is defined in the pixel defining layer (PDL). The light-emitting opening (OH) of the pixel defining layer (PDL) exposes at least a portion of the first electrode (EL1). In this embodiment, a first light-emitting region (EA1) may be defined by the light-emitting opening (OH).

[0060] The hole control layer (HTR), the light-emitting layer (EML), and the electronic control layer (ETR) overlap at least the pixel region (PXA-R). Each of the hole control layer (HTR), the light-emitting layer (EML), the electronic control layer (ETR), and the second electrode (EL2) may be commonly disposed in the first to third pixel regions (PXA-R, PXA-B, PXA-G, see FIG. 2c). Each of the hole control layer (HTR), the light-emitting layer (EML), the electronic control layer (ETR), and the second electrode (EL2) overlapping the first to third pixel regions (PXA-R, PXA-B, PXA-G, see FIG. 2c) may have an integral shape. However, not limited thereto, at least one of the hole control layer (HTR), the light-emitting layer (EML), and the electronic control layer (ETR) may be formed separately for each of the first to third pixel regions (PXA-R, PXA-B, PXA-G, see FIG. 2c). In one embodiment, the light-emitting layer (EML) may be patterned within the light-emitting aperture (OH) and formed separately for each of the first to third pixel regions (PXA-R, PXA-B, PXA-G, see FIG. 2c).

[0061] The hole control layer (HTR) includes a hole transport layer and may further include a hole injection layer.

[0062] The emitting layer (EML) can generate a third light, which is the source light. The emitting layer (EML) can generate blue light. The blue light may include light with a wavelength of 410 nm to 480 nm. The emission spectrum of the blue light may have a maximum peak in the wavelength range of 440 nm to 460 nm.

[0063] The electronic control layer (ETR) includes an electron transport layer and may further include an electron injection layer.

[0064] The display element layer (DP-LED) may include a thin film encapsulation layer (TFE) that protects the second electrode (EL2). The thin film encapsulation layer (TFE) may include an organic material or an inorganic material. The thin film encapsulation layer (TFE) may have a multilayer structure in which an inorganic layer and an organic layer are repeated. In this embodiment, the thin film encapsulation layer (TFE) may include a first encapsulation inorganic layer (IOL1), an encapsulation organic layer (OL), and a second encapsulation inorganic layer (IOL2). The first and second encapsulation inorganic layers (IOL1 / IOL2) protect the light-emitting element (LED) from external moisture, and the encapsulation organic layer (OL) can prevent defects in the light-emitting element (LED) caused by foreign substances introduced during the manufacturing process. Although not shown, the display panel (DP) may further include a refractive index control layer on the upper side of the thin film encapsulation layer (TFE) to improve light emission efficiency.

[0065] As illustrated in FIG. 2b, an optical structure layer (OSL) is disposed on a thin film encapsulation layer (TFE). The optical structure layer (OSL) may include a light control layer (CCL), a color filter layer (CFL), and a base layer (BL). In this specification, the optical structure layer (OSL) may be referred to as an upper panel, an upper display substrate, or an optical member.

[0066] A light control layer (CCL) may be disposed on a display element layer (DP-LED) including a light-emitting element (LED). The light control layer (CCL) may include a bank (BMP), a light control pattern (CCP), and a barrier layer (CAP, CAP-T).

[0067] The bank (BMP) may include a base resin and additives. The base resin may consist of various resin compositions that may generally be referred to as binders. The additives may include coupling agents and / or photoinitiators. The additives may further include dispersants.

[0068] The bank (BMP) may include a black coloring agent for light blocking. The bank (BMP) may include a black dye or a black pigment mixed into a base resin. In one embodiment, the black coloring agent may include carbon black, or a metal such as chromium or an oxide thereof.

[0069] A bank (BMP) includes a bank opening (BW-OH) corresponding to a light-emitting opening (OH). In a planar view, the bank opening (BW-OH) overlaps with the light-emitting opening (OH) and has a larger area than the light-emitting opening (OH). That is, the bank opening (BW-OH) may have a larger area than the light-emitting region (EA1) defined by the light-emitting opening (OH). Meanwhile, in this specification, "corresponds" means that the two configurations overlap when viewed in the thickness direction (DR3) of the display panel (DP) and are not limited to the same area.

[0070] A light control pattern (CCP) is placed inside the bank opening (BW-OH). At least some of the light control patterns (CCP) can change the optical properties of the source light.

[0071] The light control pattern (CCP-R) may include quantum dots for changing the optical properties of the source light. The light control pattern (CCP-R) may include quantum dots that convert the source light into light of a different wavelength. In the light control pattern (CCP-R) superimposed on the first pixel area (PXA-R), the quantum dots may convert the source light, which includes blue light, into red light.

[0072] Quantum dots may have a core-shell structure, and the core of the quantum dot may be selected from group II-VI compounds, group III-VI compounds, group I-III-VI compounds, group III-V compounds, group IV-VI compounds, group IV elements, group IV compounds, and combinations thereof.

[0073] Group II-VI compounds are diatomic compounds selected from the group consisting of CdSe, CdTe, CdS, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS, and mixtures thereof; ternary compounds selected from the group consisting of CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS, and mixtures thereof; and may be selected from the group consisting of four-element compounds selected from the group consisting of HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe and mixtures thereof.

[0074] Group III-VI compounds include binary compounds such as In2S3 and In2Se3, and InGaS 3 It may include ternary compounds such as InGaSe3, or any combination thereof.

[0075] Group I-III-VI compounds are ternary compounds selected from the group consisting of AgInS, AgInS2, CuInS, CuInS2, AgGaS2, CuGaS2CuGaO2, AgGaO2, AgAlO2, and mixtures thereof, or AgInGaS2, It can be selected from four-element compounds such as CuInGaS2.

[0076] III-V group compounds may be selected from the group consisting of diatomic compounds selected from the group consisting of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, and mixtures thereof; ternary compounds selected from the group consisting of GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InGaP, InAlP, InNP, InNAs, InNSb, InPAs, InPSb, and mixtures thereof; and quaternary compounds selected from the group consisting of GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, and mixtures thereof. Meanwhile, III-V group compounds may further include a group II metal. For example, InZnP, etc., can be selected as a Group III-II-V compound.

[0077] Group IV-VI compounds may be selected from the group consisting of SnS, SnSe, SnTe, PbS, PbSe, PbTe, and mixtures thereof; ternary compounds selected from the group consisting of SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, and mixtures thereof; and quaternary compounds selected from the group consisting of SnPbSSe, SnPbSeTe, SnPbSTe, and mixtures thereof. Group IV elements may be selected from the group consisting of Si, Ge, and mixtures thereof. Group IV compounds may be ternary compounds selected from the group consisting of SiC, SiGe, and mixtures thereof.

[0078] In this case, the binary, ternary, or quaternary compounds may exist within the particle at a uniform concentration, or they may exist within the same particle with their concentration distributions partially divided into different states. Additionally, they may have a core-shell structure in which one quantum dot surrounds another. In a core-shell structure, the concentration of the element in the shell may have a concentration gradient, decreasing as it approaches the core.

[0079] In some embodiments, the quantum dot may have a core-shell structure comprising a core containing the aforementioned nanocrystal and a shell surrounding the core. The shell of the quantum dot may serve as a protective layer to maintain semiconductor properties by preventing chemical degradation of the core and / or as a charging layer to impart electrophoretic properties to the quantum dot. The shell may be a single layer or a multilayer. Examples of the shell of the quantum dot include oxides of metals or non-metals, semiconductor compounds, or combinations thereof.

[0080] For example, the oxide of the metal or nonmetal mentioned above may be exemplified as a binary compound such as SiO2, Al2O3, TiO2, ZnO, MnO, Mn2O3, Mn3O4, CuO, FeO, Fe2O3, Fe3O4, CoO, Co3O4, NiO, or a ternary compound such as MgAl2O4, CoFe2O4, NiFe2O4, CoMn2O4, but the present invention is not limited thereto.

[0081] In addition, the above semiconductor compounds may be examples of CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnSeS, ZnTeS, GaAs, GaP, GaSb, HgS, HgSe, HgTe, InAs, InP, InGaP, InSb, AlAs, AlP, AlSb, etc., but the present invention is not limited thereto.

[0082] Quantum dots can have a full width of half maximum (FWHM) of the emission wavelength spectrum of about 45 nm or less, preferably about 40 nm or less, and more preferably about 30 nm or less, and color purity or color reproducibility can be improved in this range. In addition, since the light emitted through these quantum dots is emitted in all directions, the viewing angle can be improved.

[0083] In addition, the shape of the quantum dots is not specifically limited to shapes commonly used in the field, but more specifically, shapes such as spherical, pyramidal, multi-arm, or cubic nanoparticles, nanotubes, nanowires, nanofibers, and nanoplate particles may be used.

[0084] Quantum dots can control the color of the light they emit depending on their particle size, and accordingly, they can have various emission colors such as blue, red, and green. In one embodiment, quantum dots included in a light control pattern (CCP-R) superimposed on a first pixel area (PXA-R) may have a red emission color. The smaller the particle size of the quantum dots, the more likely they are to emit light in the short wavelength region. For example, among quantum dots with the same core, the particle size of a quantum dot emitting green light may be smaller than the particle size of a quantum dot emitting red light. Additionally, among quantum dots with the same core, the particle size of a quantum dot emitting blue light may be smaller than the particle size of a quantum dot emitting green light. However, the embodiments are not limited thereto, and even among quantum dots with the same core, the particle size may be controlled depending on the shell forming material and shell thickness, etc.

[0085] Meanwhile, if quantum dots have various emission colors such as blue, red, and green, the quantum dots with different emission colors may have different core materials.

[0086] The light control pattern (CCP-R) may further include a scatterer. The light control pattern (CCP-R) may include a quantum dot that converts source light into red light and a scatterer that scatters light.

[0087] The scattering material may be an inorganic particle. For example, the scattering material may comprise at least one of TiO2, ZnO, Al2O3, SiO2, and hollow silica. The scattering material may comprise any one of TiO2, ZnO, Al2O3, SiO2, and hollow silica, or it may be a mixture of two or more materials selected from TiO2, ZnO, Al2O3, SiO2, and hollow silica.

[0088] The light control pattern (CCP-R) may include a base resin that disperses quantum dots and scatterers. The base resin serves as a medium in which quantum dots and scatterers are dispersed and may consist of various resin compositions that can generally be referred to as binders. For example, the base resin may be an acrylic resin, a urethane resin, a silicone resin, an epoxy resin, etc. The base resin may be a transparent resin.

[0089] In this embodiment, the light control pattern (CCP-R) can be formed by an inkjet process. A liquid composition is provided within the bank opening (BW-OH). The composition, polymerized by a thermal curing process or a photocuring process, has a reduced volume after curing.

[0090] A step difference may occur between the upper surface of the bank (BMP) and the upper surface of the light control pattern (CCP-R). That is, the upper surface of the bank (BMP) may be defined as higher than the upper surface of the light control pattern (CCP-R). The height difference between the upper surface of the bank (BMP) and the upper surface of the light control pattern (CCP-R) may be, for example, about 2 μm to about 3 μm.

[0091] The light control layer (CCL) may further include a barrier layer (CAP, CAP-T) disposed on at least one of the upper and lower portions of the light control pattern (CCP-R). The barrier layer (CAP, CAP-T) may serve to prevent the penetration of moisture and / or oxygen (hereinafter referred to as 'moisture / oxygen'). The barrier layer (CAP, CAP-T) may be disposed on the upper and lower portions of the light control pattern (CCP-R) to block the light control patterns (CCP-R, CCP-B, CCP-G) from being exposed to moisture / oxygen.

[0092] The barrier layer may include a first barrier layer (CAP) adjacent to the display element layer (DP-LED) and a second barrier layer (CAP-T) spaced apart from the display element layer (DP-LED) with the light control pattern (CCP-R) in between. The first barrier layer (CAP) may cover one side of the light control pattern (CCP-R) adjacent to the display element layer (DP-LED), and the second barrier layer (CAP-T) may cover the other side of the light control pattern (CCP-R) adjacent to the color filter layer (CFL). Additionally, the barrier layers (CAP, CAP-T) may cover not only the light control pattern (CCP-R) but also the bank (BMP).

[0093] The first barrier layer (CAP) may be positioned to follow the step difference between the bank (BMP) and the light control pattern (CCP-R). The second barrier layer (CAP-T) may cover one side of the bank (BMP) and the light control pattern (CCP-R) adjacent to the color filter layer (CFL). The second barrier layer (CAP-T) may be positioned directly below the low-refractive index layer (LR).

[0094] The barrier layer (CAP, CAP-T) may comprise at least one inorganic layer. That is, the barrier layer (CAP, CAP-T) may be formed by including an inorganic material. For example, the barrier layer (CAP, CAP-T) may comprise silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, silicon oxynitride, or a metal thin film having secured light transmittance. For example, the first barrier layer (CAP) disposed below the light control pattern (CCP-R) may comprise silicon oxynitride, and the second barrier layer (CAP-T) disposed above the light control pattern (CCP-R) may comprise silicon oxide. However, the embodiments are not limited thereto. Meanwhile, the barrier layer (CAP, CAP-T) may further comprise an organic film. The barrier layer (CAP, CAP-T) may be composed of a single layer or multiple layers. In the barrier layer (CAP, CAP-T), the inorganic film protects the light control pattern (CCP-R) from external moisture, and the organic film may be for removing steps defined by the bank (BMP) and the light control pattern (CCP-R) and for providing a flat base surface to the member to be placed on the upper side.

[0095] A color filter layer (CFL) is disposed on the light control layer (CCL). The color filter layer (CFL) includes at least one color filter (CF1). The color filter (CF1) transmits light within a specific wavelength range and blocks light outside that wavelength range. The color filter (CF1) of the first pixel area (PXA-R) can transmit red light and block green and blue light.

[0096] The color filter (CF1) comprises a base resin and a dye and / or pigment dispersed in the base resin. The base resin serves as a medium in which the dye and / or pigment are dispersed and may consist of various resin compositions that can generally be referred to as a binder. A detailed description of the color filter (CF1) will be provided below.

[0097] The color filter (CF1) may have a uniform thickness within the first pixel area (PXA-R). Light converted from source light containing blue light into red light through the light control pattern (CCP-R) may be provided externally with uniform brightness within the first pixel area (PXA-R).

[0098] The color filter layer (CFL) may include a low-refractive index layer (LR). The low-refractive index layer (LR) may be positioned between the light control layer (CCL) and the color filter (CF1). The low-refractive index layer (LR) may be positioned above the light control layer (CCL) to block the light control pattern (CCP-R) from being exposed to moisture / oxygen. Additionally, the low-refractive index layer (LR) may be positioned between the light control pattern (CCP-R) and the color filter (CF1) to function as an optical functional layer, such as by increasing light extraction efficiency or preventing reflected light from entering the light control layer (CCL). The low-refractive index layer (LR) may be a layer with a lower refractive index compared to adjacent layers.

[0099] The low refractive index layer (LR) is a layer having a low refractive index and may be a mixed layer of organic and inorganic materials. In one embodiment, the low refractive index layer (LR) may include a polymer resin, and may be a polymer resin in which inorganic particles are dispersed. The polymer resin included in the low refractive index layer (LR) may be, for example, silicone resin and / or acrylic silicone resin. The inorganic particles included in the low refractive index layer (LR) may be, for example, hollow sphere silica and / or porogen. However, not limited thereto, the low refractive index layer (LR) may be composed of silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, silicon oxynitride, or a metal thin film having secured light transmittance. The low refractive index layer (LR) may be composed of a single layer or multiple layers.

[0100] The low refractive index layer (LR) may have a low refractive index of 1.3 or less. In one embodiment, the refractive index of the low refractive index layer (LR) may be 1.2. The low refractive index layer (LR) may have a refractive index of 1.3 or less in the wavelength range of 400 nm to 700 nm, which is the visible light range.

[0101] Meanwhile, in a display device (DD) of one embodiment, the color filter (CF1) of the color filter layer (CFL) can be placed directly on the light control layer (CCL). In this case, the low refractive index layer (LR) can be omitted.

[0102] In one embodiment, the display panel (DP) may further include a base layer (BL) disposed on a color filter layer (CFL). The base layer (BL) may be a member that provides a reference surface on which the color filter layer (CFL) and the light control layer (CCL), etc., are disposed. The base layer (BL) may be a glass substrate, a metal substrate, a plastic substrate, etc. However, the embodiment is not limited thereto, and the base layer (BL) may be an inorganic layer, an organic layer, or a composite material layer. In addition, unlike what is illustrated, the base layer (BL) may be omitted in one embodiment.

[0103] Although not illustrated, an anti-reflective layer may be disposed on the base layer (BL). The anti-reflective layer may be a layer that reduces the reflectance of external light incident from the outside. The anti-reflective layer may be a layer that selectively transmits light emitted from the display panel (DP). In one embodiment, the anti-reflective layer may be a single layer comprising a dye and / or pigment dispersed in a base resin. The anti-reflective layer may be provided as a continuous single layer that fully overlaps the entire first to third pixel regions (PXA-R, PXA-B, PXA-G, see FIG. 2c).

[0104] The anti-reflection layer may not include a polarization layer. Accordingly, light passing through the anti-reflection layer and incident on the display element layer (DP-LED) may be unpolarized light. The display element layer (DP-LED) can receive unpolarized light from the top of the anti-reflection layer.

[0105] A display panel (DP) of one embodiment includes a lower panel comprising a display element layer (DP-LED) and an upper panel (optical structure layer, OSL) comprising a light control layer (CCL) and a color filter layer (CFL). In one embodiment, a filling layer (FML) may be disposed between the lower panel and the upper panel (OSL). In one embodiment, the filling layer (FML) may fill the space between the display element layer (DP-LED) and the light control layer (CCL). The filling layer (FML) may be placed directly on the encapsulation layer (TFE), and a first barrier layer (CAP) included in the light control layer (CCL) may be placed directly on the filling layer (FML). The lower surface of the filling layer (FML) may be in contact with the upper surface of the encapsulation layer (TFE), and the upper surface of the filling layer (FML) may be in contact with the lower surface of the first barrier layer (CAP).

[0106] The fill layer (FML) can function as a buffer between the display element layer (DP-LED) and the light control layer (CCL). In one embodiment, the fill layer (FML) can perform shock absorption functions and increase the strength of the display panel (DP). The fill layer (FML) can be formed from a filler resin containing a polymer resin. For example, the fill layer (FML) may be formed from a filler resin containing an acrylic resin or an epoxy resin.

[0107] The filling layer (FML) may be formed in a separate process step, distinct from the encapsulating layer (TFE) positioned at the bottom and the first barrier layer (CAP) positioned at the top. Meanwhile, the filling layer (FML) may be formed from a different material from the encapsulating layer (TFE) and the barrier layer (CAP), respectively.

[0108] Referring to FIG. 2c, a display panel (DP) may include a base substrate (BS) and a circuit element layer (DP-CL) disposed on the base substrate (BS). The circuit element layer (DP-CL) may be disposed on the base substrate (BS). The circuit element layer (DP-CL) may include an insulating layer, a semiconductor pattern, a conductive pattern, and a signal line, etc. An insulating layer, a semiconductor layer, and a conductive layer are formed on the base substrate (BS) by means such as coating or deposition, and subsequently, the insulating layer, the semiconductor layer, and the conductive layer may be selectively patterned through a plurality of photolithography processes. Subsequently, the semiconductor pattern, the conductive pattern, and the signal line included in the circuit element layer (DP-CL) may be formed. In one embodiment, the circuit element layer (DP-CL) may include a transistor, a buffer layer, and a plurality of insulating layers.

[0109] A light-emitting element (LED) according to one embodiment may include a first electrode (EL1), a second electrode (EL2) facing the first electrode (EL1), and a light-emitting layer (EML) disposed between the first electrode (EL1) and the second electrode (EL2). The light-emitting layer (EML) included in the light-emitting element (LED) may include an organic light-emitting material or quantum dots as a light-emitting material. The light-emitting element (LED) may further include a hole control layer (HTR) and an electron control layer (ETR). Meanwhile, although not illustrated, the light-emitting element (LED) may further include a capping layer (not illustrated) disposed on top of the second electrode (EL2).

[0110] A pixel defining film (PDL) is disposed on a circuit element layer (DP-CL) and can cover a portion of the first electrode (EL1). A light-emitting opening (OH) is defined in the pixel defining film (PDL). The light-emitting opening (OH) of the pixel defining film (PDL) exposes at least a portion of the first electrode (EL1). In this embodiment, light-emitting regions (EA1, EA2, EA3) are defined to correspond to a portion of the first electrode (EL1) exposed by the light-emitting opening (OH).

[0111] The display element layer (DP-LED) may include a first light-emitting region (EA1), a second light-emitting region (EA2), and a third light-emitting region (EA3). The first light-emitting region (EA1), the second light-emitting region (EA2), and the third light-emitting region (EA3) may be regions separated by a pixel defining film (PDL). The first light-emitting region (EA1), the second light-emitting region (EA2), and the third light-emitting region (EA3) may correspond to a first pixel region (PXA-R), a second pixel region (PXA-B), and a third pixel region (PXA-G), respectively.

[0112] The light-emitting regions (EA1, EA2, EA3) may overlap with the pixel regions (PXA-R, PXA-B, PXA-G) and not overlap with the bank well region (BWA). When viewed in a planar view, the area of ​​the pixel regions (PXA-R, PXA-B, PXA-G) separated by banks (BMP) may be larger than the area of ​​the light-emitting regions (EA1, EA2, EA3) separated by pixel defining films (PDL).

[0113] In a light-emitting element (LED), a first electrode (EL1) is disposed on a circuit element layer (DP-CL). The first electrode (EL1) may be an anode or a cathode. Additionally, the first electrode (EL1) may be a pixel electrode. The first electrode (EL1) may be a transmissive electrode, a transmissive electrode, or a reflective electrode.

[0114] A hole control layer (HTR) may be disposed between the first electrode (EL1) and the light-emitting layer (EML). The hole control layer (HTR) may include at least one of a hole injection layer, a hole transport layer, and an electron blocking layer. The hole control layer (HTR) may be disposed as a common layer to overlap with the entire pixel defining film (PDL) separating the light-emitting regions (EA1, EA2, EA3). However, the embodiment is not limited thereto, and the hole control layer (HTR) may be patterned and provided to be disposed separately corresponding to each of the light-emitting regions (EA1, EA2, EA3).

[0115] The light-emitting layer (EML) is disposed on the hole control layer (HTR). In one embodiment, the light-emitting layer (EML) may be provided as a common layer to overlap the entire pixel defining layer (PDL) separating the light-emitting regions (EA1, EA2, EA3) and the light-emitting regions (EA1, EA2, EA3). In one embodiment, the light-emitting layer (EML) may emit blue light. The light-emitting layer (EML) may overlap the entire hole control layer (HTR) and the electron control layer (ETR).

[0116] However, the embodiments are not limited thereto, and in one embodiment, the light-emitting layer (EML) may be disposed within the light-emitting aperture (OH). That is, the light-emitting layer (EML) may be formed separately to correspond to light-emitting regions (EA1, EA2, EA3) separated by a pixel defining film (PDL). The light-emitting layer (EML) formed separately to correspond to the light-emitting regions (EA1, EA2, EA3) may all emit blue light or emit light of different wavelength regions.

[0117] The light-emitting layer (EML) may have a multilayer structure consisting of a single layer made of a single material, a single layer made of multiple different materials, or multiple layers made of multiple different materials. The light-emitting layer (EML) may include a fluorescent or phosphorescent material. In a light-emitting device of one embodiment, the light-emitting layer (EML) may include an organic light-emitting material, a metal-organic complex, or quantum dots as a light-emitting material. Meanwhile, although FIGS. 2b and 2c illustrate an example of a light-emitting device (LED) including a single light-emitting layer (EML), in one embodiment, the light-emitting device (LED) may include a plurality of light-emitting stacks, each comprising at least one light-emitting layer.

[0118] In FIG. 3, unlike the light-emitting element of one embodiment shown in FIG. 2b and 2c, a light-emitting element (LED) including a plurality of light-emitting stacks (ST1, ST2, ST3, ST4) is illustrated as an example.

[0119] Referring to FIG. 3, a light-emitting element (LED) of one embodiment may include a first electrode (EL1), a second electrode (EL2) facing the first electrode (EL1), and first to fourth light-emitting stacks (ST1, ST2, ST3, ST4) disposed between the first electrode (EL1) and the second electrode (EL2). Meanwhile, FIG. 3 exemplarily illustrates that the light-emitting element (LED) includes four light-emitting stacks, but the number of light-emitting stacks included in the light-emitting element (LED) may be fewer or more than this.

[0120] The light-emitting element (LED) may include first to third charge generating layers (CGL1, CGL2, CGL3) disposed between first to fourth light-emitting stacks (ST1, ST2, ST3, ST4).

[0121] Each of the first to third charge generation layers (CGL1, CGL2, CGL3) can generate charges (electrons and holes) by forming a complex through an oxidation-reduction reaction when voltage is applied. Subsequently, the first to third charge generation layers (CGL1, CGL2, CGL3) can provide the generated charges to adjacent stacks (ST1, ST2, ST3, ST4), respectively. The first to third charge generation layers (CGL1, CGL2, CGL3) can double the efficiency of the current generated in the adjacent stacks (ST1, ST2, ST3, ST4) and can play a role in regulating the balance of charges between the adjacent stacks (ST1, ST2, ST3, ST4).

[0122] Each of the first to third charge generation layers (CGL1, CGL2, CGL3) may include an n-type layer and a p-type layer. The first to third charge generation layers (CGL1, CGL2, CGL3) may have a structure in which the n-type layer and the p-type layer are joined together. However, not limited thereto, the first to third charge generation layers (CGL1, CGL2, CGL3) may include only one of the n-type layer and the p-type layer. The n-type layer may be a charge generation layer that provides electrons to an adjacent stack. The n-type layer may be a layer in which an n-dopant is doped into a base material. The p-type layer may be a charge generation layer that provides holes to an adjacent stack.

[0123] In one embodiment, the thickness of each of the first to third charge generation layers (CGL1, CGL2, CGL3) may be 1 angstrom (Å) or more and 300 angstroms (Å) or less. For example, the thickness of each of the first to third charge generation layers (CGL1, CGL2, CGL3) may be 165 angstroms. The concentration of the n-dopant doped in the first to third charge generation layers (CGL1, CGL2, CGL3) may be 0.1% or more and 3% or less, specifically 1% or less. If the concentration is less than 0.1%, the effect of the first to third charge generation layers (CGL1, CGL2, CGL3) in balancing charges may hardly occur. If the concentration is greater than 3%, it may reduce the light efficiency of the light-emitting device (OLED).

[0124] Each of the first to third charge generating layers (CGL1, CGL2, CGL3) may comprise a charge generating compound composed of an arylamine-based organic compound, a metal, a metal oxide, a carbide, a fluoride, or a mixture thereof. For example, the arylamine-based organic compound may include α-NPD, 2-TNATA, TDATA, MTDATA, sprio-TAD, or sprio-NPB. The metal may include cesium (Cs), molybdenum (Mo), vanadium (V), titanium (Ti), tungsten (W), barium (Ba), or lithium (Li). The metal oxide, carbide, and fluoride may include Re2O7, MoO3, V2O5, WO3, TiO2, Cs2CO3, BaF, LiF, or CsF. However, the materials of the first to third charge generating layers (CGL1, CGL2, CGL3) are not limited to the above examples.

[0125] Each of the first to fourth light-emitting stacks (ST1, ST2, ST3, ST4) may include a light-emitting layer. The first light-emitting stack (ST1) may include a first light-emitting layer (BEML-1), the second light-emitting stack (ST2) may include a second light-emitting layer (BEML-2), the third light-emitting stack (ST3) may include a third light-emitting layer (BEML-3), and the fourth light-emitting stack (ST4) may include a fourth light-emitting layer (GEML). Some of the light-emitting layers included in the first to fourth light-emitting stacks (ST1, ST2, ST3, ST4) may emit substantially the same color light, and some may emit different color light.

[0126] In one embodiment, the first to third light-emitting layers (BEML-1, BEML-2, BEML-3) of the first to third light-emitting stacks (ST1, ST2, ST3) may emit substantially the same first color light. For example, the first color light may be blue light, which is the source light described above. The wavelength range of the light emitted by the first to third light-emitting layers (BEML-1, BEML-2, BEML-3) may be about 420 nm or more and 480 nm or less.

[0127] The fourth light-emitting layer (GEML) of the fourth light-emitting stack (ST4) can emit a second color light that is different from the first color light. For example, the second color light may be green light. The wavelength range of the light emitted by the fourth light-emitting layer (GEML) may be approximately 520 nm or more and 600 nm or less.

[0128] At least some of the first to fourth light-emitting layers (BEML-1, BEML-2, BEML-3, GEML) may have a bilayer structure comprising different host materials. For example, one layer of the bilayer structure may comprise a hole-transporting host material, and the other may comprise an electron-transporting host material. The electron-transporting host material may be a material comprising an electron-transporting moiety within its molecular structure.

[0129] The first light-emitting stack (ST1) may include a hole control layer (HTR) that transports holes provided from the first electrode (EL1) to the first light-emitting layer (BEML-1), and a first intermediate electron transport region (METL1) that transports electrons generated from the first charge generation layer (CGL1) to the first light-emitting layer (BEML-1).

[0130] The hole control layer (HTR) may include a hole injection layer (HIL) disposed on the first electrode (EL1) and a hole transport layer (HTL) disposed on the hole injection layer (HIL). However, not limited thereto, the hole control layer (HTR) may further include at least one of a hole buffer layer, a light-emitting auxiliary layer, and an electron blocking layer. The hole transport layer and the hole buffer layer may be layers that increase light emission efficiency by compensating for the resonance distance according to the wavelength of light emitted from the light-emitting layer. The electron blocking layer may be a layer that prevents electron injection from the electron transport region to the hole transport region.

[0131] The first intermediate electron transport region (METL1) may include a first intermediate electron transport layer disposed on the first light-emitting layer (BEML-1). However, not limited thereto, the first intermediate electron transport region (METL1) may further include at least one of an electron buffer layer and a hole blocking layer.

[0132] The second light-emitting stack (ST2) may include a first intermediate hole transport region (MHTR1) that transports holes generated from the first charge generation layer (CGL1) to the second light-emitting layer (BEML-2), and a second intermediate electron transport region (METL2) that transports electrons provided from the second charge generation layer (CGL2) to the second light-emitting layer (BEML-2).

[0133] The first intermediate hole transport region (MHTR1) may include a first intermediate hole transport layer (MHTL1) disposed on the first charge generation layer (CGL1). The first intermediate hole transport region (MHTR1) may further include at least one of a hole buffer layer, a light-emitting auxiliary layer, and an electron blocking layer disposed on the first intermediate hole transport layer (MHTL1). Additionally, the first intermediate hole transport region (MHTR1) may further include a first intermediate hole injection layer (MHIL1) disposed on the first charge generation layer (CGL1). The first intermediate hole injection layer (MHIL1) may be disposed between the first charge generation layer (CGL1) and the first intermediate hole transport layer (MHTL1). Unlike as shown in FIG. 3, the first intermediate hole injection layer (MHIL1) may be omitted.

[0134] The second intermediate electron transport region (METL2) may include a second intermediate electron transport layer disposed on the second light-emitting layer (BEML-2). However, it is not limited thereto, and the second intermediate electron transport region (METL2) may further include at least one of an electron buffer layer disposed between the second intermediate electron transport layer and the second light-emitting layer (BEML-2) and a hole blocking layer.

[0135] The third light-emitting stack (ST3) may include a second intermediate hole transport region (MHTR2) that transports holes generated from the second charge generation layer (CGL2) to the third light-emitting layer (BEML-3), and a third intermediate electron transport region (METL3) that transports electrons provided from the third charge generation layer (CGL3) to the third light-emitting layer (BEML-3).

[0136] The second intermediate hole transport region (MHTR2) may include a second intermediate hole transport layer (MHTL2) disposed on the second charge generation layer (CGL2). However, not limited thereto, the second intermediate hole transport region (MHTR2) may further include at least one of a hole buffer layer, a light-emitting auxiliary layer, and an electron blocking layer disposed on the second intermediate hole transport layer (MHTL2). Additionally, the second intermediate hole transport region (MHTR2) may further include a second intermediate hole injection layer (MHIL2) disposed on the second charge generation layer (CGL2). The second intermediate hole injection layer (MHIL2) may be disposed between the second charge generation layer (CGL2) and the second intermediate hole transport layer (MHTL2). Unlike as shown in FIG. 3, the second intermediate hole injection layer (MHIL2) may be omitted.

[0137] The third intermediate electron transport region (METL3) may include a third intermediate electron transport layer disposed on the third light-emitting layer (BEML-3). However, not limited thereto, the third intermediate electron transport region (METL3) may further include at least one of an electron buffer layer disposed between the third intermediate electron transport layer and the third light-emitting layer (BEML-3) and a hole blocking layer.

[0138] The fourth light-emitting stack (ST4) may include a third intermediate hole transport region (MHTR3) that transports holes generated from the third charge generation layer (CGL3) to the fourth light-emitting layer (GEML), and an electron control layer (ETR) that transports electrons provided from the second electrode (EL2) to the fourth light-emitting layer (GEML).

[0139] The third intermediate hole transport region (MHTR3) may include a third intermediate hole transport layer (MHTL3) disposed on the third charge generation layer (CGL3). However, not limited thereto, the third intermediate hole transport region (MHTR3) may further include at least one of a hole buffer layer, a light-emitting auxiliary layer, and an electron blocking layer disposed on the third intermediate hole transport layer (MHTL3). Additionally, the third intermediate hole transport region (MHTR3) may further include a third intermediate hole injection layer (MHIL3) disposed on the third charge generation layer (CGL3). The third intermediate hole injection layer (MHIL3) may be disposed between the third charge generation layer (CGL3) and the third intermediate hole transport layer (MHTL3). Unlike as shown in FIG. 3, the third intermediate hole injection layer (MHIL3) may be omitted.

[0140] The electronic control layer (ETR) may include an electron transport layer (ETL) disposed on the fourth light-emitting layer (GEML) and an electron injection layer (EIL) disposed on the electron transport layer (ETL). However, not limited thereto, the electronic control layer (ETR) may further include at least one of an electron buffer layer disposed between the electron transport layer (ETL) and the fourth light-emitting layer (GEML) and a hole blocking layer.

[0141] In one embodiment, the light-emitting element (LED) can emit light from the first electrode (EL1) toward the second electrode (EL2), and based on the direction of light emission, the hole control layer (HTR) can be disposed below the plurality of light-emitting stacks (ST1, ST2, ST3, ST4), and the electronic control layer (ETR) can be disposed above the plurality of light-emitting stacks (ST1, ST2, ST3, ST4). However, not limited thereto, the device may have an inverted structure in which the electronic control layer (ETR) is disposed below the plurality of light-emitting stacks (ST1, ST2, ST3, ST4) and the hole control layer (HTR) is disposed above the plurality of light-emitting stacks (ST1, ST2, ST3, ST4) based on the direction of light emission.

[0142] Referring again to FIG. 2c, an electronic control layer (ETR) may be disposed between the light-emitting layer (EML) and the second electrode (EL2). The electronic control layer (ETR) may include at least one of an electron injection layer, an electron transport layer, and a hole blocking layer. Referring again to FIG. 2c, the electronic control layer (ETR) may be disposed as a common layer to overlap with the entire pixel definition film (PDL) separating the light-emitting regions (EA1, EA2, EA3). However, the embodiment is not limited thereto, and the electronic control layer (ETR) may be patterned and provided to be disposed separately corresponding to each of the light-emitting regions (EA1, EA2, EA3).

[0143] The second electrode (EL2) is provided on the electronic control layer (ETR). The second electrode (EL2) may be a common electrode. The second electrode (EL2) may be a cathode or an anode, but the embodiments are not limited thereto. For example, if the first electrode (EL1) is an anode, the second electrode (EL2) may be a cathode, and if the first electrode (EL1) is a cathode, the second electrode (EL2) may be an anode. The second electrode (EL2) may be a transmissive electrode, a transmissive electrode, or a reflective electrode.

[0144] The encapsulation layer (TFE) may be disposed on a light-emitting element (LED). For example, in one embodiment, the encapsulation layer (TFE) may be disposed on a second electrode (EL2). Additionally, if the light-emitting element (LED) includes a capping layer (not shown), the encapsulation layer (TFE) may be disposed on the capping layer (not shown). As described above, the encapsulation layer (TFE) comprises at least one organic film and at least one inorganic film, and the inorganic film and the organic film may be arranged alternately.

[0145] A display panel (DP) of one embodiment may include an optical structure layer (OSL) disposed on a display element layer (DP-LED). The optical structure layer (OSL) may include a light control layer (CCL), a color filter layer (CFL), and a base layer (BL).

[0146] The light control layer (CCL) may include a light converter. The light converter may be a quantum dot or a phosphor. The light converter may emit light by converting the wavelength of the provided light. That is, the light control layer (CCL) may be a layer containing quantum dots in at least a portion or a layer containing a phosphor.

[0147] The light control layer (CCL) may include a plurality of light control patterns (CCP-R, CCP-B, CCP-G). The light control patterns (CCP-R, CCP-B, CCP-G) may be spaced apart from each other. The light control patterns (CCP-R, CCP-B, CCP-G) may be spaced apart from each other by a bank (BMP). The light control patterns (CCP-R, CCP-B, CCP-G) may be placed within a bank opening (BW-OH) defined in the bank (BMP). However, the embodiments are not limited thereto. In FIG. 2c, the bank (BMP) is shown to have a rectangular shape in cross-section and not overlap with the light control patterns (CCP-R, CCP-B, CCP-G), but the edges of the light control patterns (CCP-R, CCP-B, CCP-G) may overlap with the bank (BMP) at least partially. The bank (BMP) may have a trapezoidal shape in cross-section. The bank (BMP) may have a shape in which the width in cross-section increases as it approaches the display element layer (DP-LED).

[0148] The light control patterns (CCP-R, CCP-B, CCP-G) may be parts that convert the wavelength of light provided by the display element layer (DP-LED) or transmit the provided light. The light control patterns (CCP-R, CCP-B, CCP-G) may be formed by an inkjet process. A liquid ink composition may be provided within the bank opening (BW-OH), and the provided ink composition may be polymerized by a thermal curing process or a photocuring process to form the light control patterns (CCP-R, CCP-B, CCP-G).

[0149] The light control layer (CCL) may include a first light control pattern (CCP-R) comprising a first quantum dot that converts source light provided by a light-emitting element (LED) into a first light, a second light control pattern (CCP-B) that transmits source light, and a third light control pattern (CCP-G) comprising a second quantum dot that converts source light into a second light.

[0150] In one embodiment, the first light control pattern (CCP-R) provides red light, which is the first light, and the second light control pattern (CCP-B) may provide blue light among the source light provided from the light-emitting element (LED) by transmitting it. The third light control pattern (CCP-G) may provide green light, which is the second light. For example, the first quantum dot may be a red quantum dot and the second quantum dot may be a green quantum dot.

[0151] Additionally, the light control layer (CCL) may further include a scatterer. The first light control pattern (CCP-R) includes a first quantum dot and a scatterer, the third light control pattern (CCP-G) includes a second quantum dot and a scatterer, and the second light control pattern (CCP-B) may not include a quantum dot and include a scatterer.

[0152] Each of the first light control pattern (CCP-R), the second light control pattern (CCP-B), and the third light control pattern (CCP-G) may include a base resin that disperses quantum dots and scatterers. In one embodiment, the first light control pattern (CCP-R) may include first quantum dots and scatterers dispersed within the base resin, the third light control pattern (CCP-G) may include second quantum dots and scatterers dispersed within the base resin, and the second light control pattern (CCP-B) may include scatterers dispersed within the base resin.

[0153] The light control layer (CCL) may further include a barrier layer (CAP, CAP-T) disposed in at least one of the upper and lower portions of the light control unit. The barrier layer may include a first barrier layer (CAP) adjacent to the display element layer (DP-LED) and a second barrier layer (CAP-T) spaced apart from the display element layer (DP-LED) with a light control pattern (CCP-R) in between. The barrier layer may include a first barrier layer (CAP) adjacent to the display element layer (DP-LED) and a second barrier layer (CAP-T) spaced apart from the display element layer (DP-LED) with a light control pattern (CCP-R, CCP-B, CCP-G) in between.

[0154] In a display panel (DP), an optical structure layer (OSL) includes a color filter layer (CFL) disposed on a light control layer (CCL). The color filter layer (CFL) may include color filters (CF1, CF2, CF3). The color filter layer (CFL) may include a first color filter (CF1) that transmits a first light, a second color filter (CF2) that transmits a portion of the source light, and a third color filter (CF3) that transmits a second light. In one embodiment, the first color filter (CF1) may be a red filter, the second color filter (CF2) may be a blue filter, and the third color filter (CF3) may be a green filter.

[0155] Each of the filters (CF1, CF2, CF3) includes a polymer photosensitive resin and a colorant. The first color filter (CF1) may include a red colorant, the second color filter (CF2) may include a blue colorant, and the third color filter (CF3) may include a green colorant. The first color filter (CF1) may include a red pigment or a red dye, the second color filter (CF2) may include a blue pigment or a blue dye, and the third color filter (CF3) may include a green pigment or a green dye.

[0156] Each of the first to third color filters (CF1, CF2, CF3) may be positioned corresponding to each of the first pixel area (PXA-R), the second pixel area (PXA-B), and the third pixel area (PXA-G). Additionally, each of the first to third color filters (CF1, CF2, CF3) may be positioned corresponding to each of the first to third light control patterns (CCP-R, CCP-B, CCP-G).

[0157] Additionally, a plurality of color filters (CF1, CF2, CF3) that transmit different light may be superimposed and arranged in the surrounding area (NPXA) positioned between the pixel areas (PXA-R, PXA-B, PXA-G). A plurality of color filters (CF1, CF2, CF3) may be superimposed and arranged in the third direction (DR3), which is the thickness direction, to distinguish the boundary between adjacent light-emitting areas (PXA-R, PXA-B, PXA-G). Meanwhile, unlike what is illustrated, the color filter layer (CFL) may include a light-blocking portion (not shown) to distinguish the boundary between adjacent color filters (CF1, CF2, CF3). The light-blocking portion (not shown) may be formed by a blue filter, or may be formed by including an organic light-blocking material or an inorganic light-blocking material including a black pigment or a black dye.

[0158] The color filter layer (CFL) may include a low-refractive index layer (LR). The low-refractive index layer (LR) may be placed between the light control layer (CCL) and the color filters (CF1, CF2, CF3). The low-refractive index layer (LR) may be placed on top of the light control layer (CCL) to block the light control patterns (CCP-R, CCP-B, CCP-G) from being exposed to moisture / oxygen. Additionally, the low-refractive index layer (LR) may be placed between the light control patterns (CCP-R, CCP-B, CCP-G) and the color filters (CF1, CF2, CF3) to function as an optical functional layer, such as increasing light extraction efficiency or preventing reflected light from entering the light control layer (CCL). The low-refractive index layer (LR) may be a layer with a lower refractive index compared to adjacent layers.

[0159] The low refractive index layer (LR) may comprise a polymer resin, and may have inorganic particles dispersed in the polymer resin. The polymer resin included in the low refractive index layer (LR) may be, for example, silicone resin and / or acrylic silicone resin. The inorganic particles included in the low refractive index layer (LR) may be, for example, hollow sphere silica and / or porogen. The low refractive index layer (LR) may be composed of a single layer or multiple layers.

[0160] Meanwhile, in a display device (DD) of one embodiment, the color filters (CF1, CF2, CF3) of the color filter layer (CFL) can be placed directly on the light control layer (CCL). In this case, the low refractive index layer (LR) can be omitted.

[0161] In one embodiment, the optical structure layer (OSL) may further include a base layer (BL) disposed on a color filter layer (CFL). The base layer (BL) may be a member that provides a base surface on which the color filter layer (CFL) and the light control layer (CCL), etc., are disposed. The base layer (BL) may be a glass substrate, a metal substrate, a plastic substrate, etc. However, the embodiments are not limited thereto, and the base layer (BL) may be an inorganic layer, an organic layer, or a composite material layer. Also, unlike what is illustrated, the base layer (BL) may be omitted in one embodiment.

[0162] Referring again to FIG. 2b and FIG. 2c, the first color filter (CF1) and the second color filter (CF2) can each limit the transmittance to a certain range through the pigment and composition, thickness, etc. included.

[0163] The first color filter (CF1) included in the color filter layer (CFL) of one embodiment may have a light transmittance of 70% or less in a wavelength range of 600 nm or more and 640 nm or less. The first color filter (CF1) has a peak wavelength (λ) of the first light emitted from the first light control pattern (CCP-R) disposed below. max At the point, it may have a light transmittance of 60% or more and 70% or less. In one embodiment, the first light has a peak wavelength in a wavelength range of 620 nm or more and 640 nm or less, and the first color filter (CF1) may have a light transmittance of 60% or more and 70% or less in both the range of 620 nm or more and 640 nm or less, which is the peak wavelength range of the first light, and the adjacent range of 600 nm or more and less than 620 nm.

[0164] The first color filter (CF1) may include a point where the light transmittance is 10% in the wavelength range greater than 590 nm and less than or equal to 610 nm. That is, the point where the light transmittance is 10% in the light transmittance spectrum of the first color filter (CF1) may be located in the wavelength range greater than 590 nm and less than or equal to 610 nm, which is adjacent to the peak wavelength range of the first light. As the point where the light transmittance of the first color filter (CF1) is 10% is located in the wavelength range greater than 590 nm and less than or equal to 610 nm, which is adjacent to the peak wavelength range of the first light, the light transmittance spectrum of the first color filter (CF1) may have a narrow shape in which the absorption rate increases to be specific to the desired wavelength and decreases significantly as the wavelength changes.

[0165] The first color filter (CF1) may have a transmittance of less than 10% in a wavelength range of 590 nm or less. That is, the first color filter (CF1) may have a low light transmittance of less than 10% in a wavelength range of 590 nm or less that is outside the peak wavelength range of the first light. Accordingly, the first color filter (CF1) can block light of wavelengths other than the first light, thereby improving the color reproduction rate of the display panel (DP).

[0166] The second color filter (CF2) included in the color filter layer (CFL) of one embodiment may have a light transmittance of 75% or less in a wavelength range of 430 nm or more and 470 nm or less. The second color filter (CF2) is at the peak wavelength (λ) of the source light emitted from the second light control pattern (CCP-B) disposed below. max At the point, it may have a light transmittance of 65% or more and 75% or less. In one embodiment, the source light has a peak wavelength in a wavelength range of 440 nm or more and 460 nm or less, and the second color filter (CF2) may have a light transmittance of 65% or more and 75% or less in all of the wavelength range of 440 nm or more and 460 nm or less, which is the peak wavelength range of the source light, the adjacent range of 430 nm or more and less than 440 nm, and the range of 460 nm or more and less than 470 nm.

[0167] The full width at half maximum of the light transmittance spectrum of the second color filter (CF2) may be 95 nm or less. The second color filter (CF2) has a light transmittance spectrum with a full width at half maximum of 95 nm or less, and the light transmittance spectrum of the second color filter (CF2) may have a narrow shape in which the absorption rate increases to be specific to the desired wavelength and decreases significantly as the wavelength changes.

[0168] The first color filter (CF1) includes a red colorant. The first color filter (CF1) may include a red pigment or a red dye. In one embodiment, the first color filter (CF1) is CI Pigment Red (red pigment) 1, 2, 3, 4, 5, 7, 9, 12, 14, 23, 38, 41, 42, 48, 48:1, 48:2, 48:3, 48:4, 48:5, 48:6, 49, 49:1, 51:1, 52:1, 52:2, 53, 53:1, 53:3, 57, 57:1, 57:2, 57:3, 58:2, 58:4, 63:1, 81, 81:1, 81:2, 81:3, 81:4, 81:5, 81:6, 88, 112, 122, 123, 144, 146, 148, 149, 150, 166, 168, 169, 170, 175, 176, 177, 178, 179, 184, 185, 187, 188, 190, 192, 194, 200, 200:1, 202, 206, 207, 208, 209, 210, 214, 216, 220, 221, 224, 242, 246, 247, 251, 253, 254, 255, 256, 257, 260, 262, 264, 270, It may include at least one red pigment among 272 and 291. For example, the first color filter (CF1) may include CI Pigment Red 179 or CI Pigment Red 264. In addition, the first color filter (CF1) may further include perylene-based, perion-based, quinacridone-based, quinacridone-quinone-based, anthraquinone-based, anthanthrone-based, benzimidazolone-based, disazo-based, azo-based, indanthrone-based, phthalocyanine-based, triarylcarbonium-based, dioxazine-based, aminoanthraquinone-based, thioindigo-based, isoindoline-based, isoindolinone-based, pyranthrone-based, or isobiolantron-based red pigments or mixtures thereof.

[0169] The first color filter (CF1) may further include a black pigment in addition to a red pigment. In one embodiment, the first color filter (CF1) may include at least one black pigment among carbon black, aniline black, lactam black, and perylene black. In one embodiment, the first color filter (CF1) may include carbon black or lactam black as the black pigment.

[0170] In the first color filter (CF1), the black pigment may be 1% by weight or less relative to the total weight of the red pigment and the black pigment. The first color filter (CF1) may contain only red pigment as a pigment, or may contain 1% or less of black pigment and the remainder of red pigment. Based on the total weight % of the first color filter (CF1), the total pigment may be included in an amount of 6% or more and 11% or less. The content ratio of the pigment included in the first color filter (CF1) may vary depending on the thickness of the first color filter (CF1).

[0171] The second color filter (CF2) includes a blue pigment. The second color filter (CF2) may include a blue pigment or a blue dye. In one embodiment, the second color filter (CF2) may include, for example, a copper phthalocyanine-based pigment. The second color filter (CF2) may include at least one blue pigment selected from CI Pigment B15, CI Pigment B15:1, CI Pigment B15:2, CI Pigment B15:3, CI Pigment B15:4, CI Pigment B15:6, CI Pigment B16, CI Pigment B22, CI Pigment B60, and CI Pigment B64. In one embodiment, the second color filter (CF2) may include CI Pigment B15:6. Alternatively, the second color filter (CF2) may include a blue dye.

[0172] The second color filter (CF2) may further include a purple pigment in addition to a blue pigment. In one embodiment, the second color filter (CF2) may include at least one purple pigment among CI Pigment V1, CI Pigment V19, CI Pigment V23, CI Pigment V27, CI Pigment V29, CI Pigment V30, CI Pigment V32, CI Pigment V37, CI Pigment V40, CI Pigment V42, and CI Pigment V50. In one embodiment, the second color filter (CF2) may include CI Pigment V23. Alternatively, the second color filter (CF2) may include a purple dye.

[0173] In the second color filter (CF2), the weight ratio of blue pigment and purple pigment may be 70:30 to 80:20. The second color filter (CF2) may contain 70% to 80% of blue pigment and the remainder of purple pigment. Based on the total weight % of the second color filter (CF2), the total pigment may be included in an amount of 3% or more and 7% or less. The content ratio of pigment included in the second color filter (CF2) may vary depending on the thickness of the second color filter (CF2).

[0174] The thickness of the first color filter (CF1) may be greater than the thickness of the second color filter (CF2). In one embodiment, the first color filter (CF1) has a first thickness (d1), and the second color filter (CF2) has a second thickness (d2), and the first thickness (d1) may be greater than the second thickness (d2). In one embodiment, the first thickness (d1) may be about 3 micrometers or more and about 5.5 micrometers or less. The second thickness (d2) may be about 1.8 micrometers or more and about 4.2 micrometers or less. Meanwhile, as shown in FIG. 2c, the third color filter (CF3) may have a thickness smaller than the thickness of the first color filter (CF1) and larger than the thickness of the second color filter (CF2). In one embodiment, the thickness of the third color filter (CF3) may be about 2.4 micrometers or more and about 4.8 micrometers or less.

[0175] In a color filter layer (CFL) of one embodiment, the first color filter (CF1) and the second color filter (CF2) each control the transmittance at the peak wavelength of light provided from the light control patterns (CCP-R, CCP-B) placed below, the transmittance at the adjacent wavelength range, the full width at half maximum, etc., to be below a certain range, thereby enabling a high color reproduction rate.

[0176] In the color filter layer (CFL) of one embodiment, the first color filter (CF1) and the second color filter (CF2) each control the transmittance at the peak wavelength of light provided from below to a range of 70% or less and 75% or less, respectively, and form a narrow width of the light transmittance spectrum by wavelength. A display panel (DP) according to one embodiment of the present invention has a structure in which a polarization layer is omitted. In order to control the reflectance and transmittance of light, which are in a trade-off relationship with each other, even without a polarization layer, the transmittance at the peak wavelength of light provided from a light source is controlled to a range of 70% or less and 75% or less, respectively, and form a narrow width of the light transmittance spectrum by wavelength. Through this, it is possible to selectively transmit light of a specific range of wavelengths among the light provided from below, while reducing light reflected by external light. Accordingly, a display panel (DP) including the color filter layer (CFL) of one embodiment can have low reflectance and high color reproduction rate.

[0177] FIG. 4a illustrates a graph of light transmittance of a first color filter included in a display panel according to one embodiment of the present invention, a graph of light transmittance of a color filter of a comparative example, and a graph of light transmittance emitted from a light source of one embodiment. FIG. 4b illustrates a graph of light transmittance of a second color filter included in a display panel according to one embodiment of the present invention, and a graph of light transmittance of a color filter of a comparative example. In FIG. 4a, the "light source" graph illustrates the emission spectrum of the first light after the source light provided from the light-emitting element (LED) shown in FIG. 2c passes through the first light control pattern (CCP-R).

[0178] Meanwhile, the transmittance of each of the first color filter and the second color filter was measured by using Otsuka Corporation's LCF-2100QD spectrometer, by forming each of the first color filter and the second color filter on a glass substrate and placing them on a stage, and obtaining spectral values ​​after light provided from the bottom of the glass substrate passed through each of the first color filter and the second color filter.

[0179] The reflectance of each of the first color filter and the second color filter was calculated by using a Konica Minolta CM-2600D spectrophotometer, forming each of the first color filter and the second color filter on a glass substrate, placing them on a stage, irradiating the upper surfaces of the first color filter and the second color filter with light at an oblique angle, and measuring the light that was scattered as it bounced off the sample and reflected within the integrating sphere, and then measuring the light that had become uniform after bouncing.

[0180] Looking at the graph shown in FIG. 4a, the first light has a wavelength range of 620 nm to 640 nm as described above, more specifically at a maximum peak wavelength (λ) at approximately 630 nm. max ) has. As described above, the first color filter of the embodiment has a peak wavelength (λ) of the first light. max Light transmittance of 70% or less at the 630nm point (T max It can be confirmed that it has ). In contrast, the color filter of the comparative example has the peak wavelength (λ) of the first light. max It can be confirmed that it has a high transmittance of over 90% at ). In addition, the first color filter of the example has a point (T) where the light transmittance is 10% in the light transmission spectrum. 10 ) is located in the wavelength range greater than 590nm and less than or equal to 610nm (λ T10 It can be confirmed that ). In contrast, the color filter of the comparative example is λ T10 It can be confirmed that the point has a high transmittance of more than 70%, and the point with a light transmittance of 10% in the light transmittance spectrum of the color filter of the comparative example is located in the wavelength range of approximately 580 nm.

[0181] Looking at the graph shown in FIG. 4b, the second light provided to the second color filter of the embodiment and the color filter of the comparative example has a wavelength range of 430 nm to 470 nm, more specifically, a maximum peak wavelength (λ) at approximately 450 nm. maxWhile having ), the second color filter of the embodiment has the peak wavelength (λ) of the second light as described above. max Low light transmittance of 75% or less at the 450nm point (T max It can be confirmed that it has ). In contrast, the color filter of the comparative example has a peak wavelength (λ) of the second light. max It can be confirmed that it has a high transmittance of over 80% in ).

[0182] Table 1 below shows the light transmittance, reflectance, and color match rate of a display panel including a color filter layer of an example and a comparative example. In Table 1, the color filter layer of the example is a color filter layer including a first color filter and a second color filter as described above in the description of FIGS. 2b and 2c. That is, the first color filter included in the color filter layer of the example has a light transmittance of 64.32% at 630 nm, and the point where the light transmittance is 10% in the light transmittance spectrum is located at 599 nm. The second color filter included in the color filter layer of the example has a light transmittance of 71.76% at 440 nm, and the wavelength at full width at half maximum of the light transmittance spectrum is 90 nm.

[0183] In the color filter layer of the comparative example, unlike the color filter layer of the embodiment, the red color filter corresponding to the first color filter has a light transmittance of 95.66% at 630 nm, and the point where the light transmittance is 10% in the light transmittance spectrum is located at 587 nm. In the color filter layer of the comparative example, the blue color filter corresponding to the second color filter has a light transmittance of 85.58% at 440 nm, and the wavelength at half maximum of the light transmittance spectrum is 108 nm.

[0184] In Table 1, the color matching rate was evaluated based on the BT2020 color space and the DCI color space.

[0185] Thickness (um) reflectivity(%) Color Match Rate (%) 1st color filter Second color filter BT2020 DCI Examples 4.2 3.0 5.07 91.3 99.7 Comparative example 2.4 2.6 10.3 84.1 -

[0186] Referring to the results in Table 1, it can be seen that the display panel including the color filter layer of the embodiment has a significantly reduced reflectance at the top of the panel and an improved color matching rate compared to the display panel including the color filter layer of the comparative example. Through the results in Table 1, it can be confirmed that the color filter layer of one embodiment can achieve low reflectance and high color reproduction rate when applied to a display panel by controlling the transmittance at the peak wavelength of light provided from a light source, the light transmittance in an adjacent wavelength range, and the full width at half maximum to a certain range or lower, thereby selectively transmitting light of a specific range of wavelengths among the light provided from below while reducing light reflected by external light.

[0187] Although the present invention has been described above with reference to preferred embodiments, those skilled in the art or those with ordinary knowledge in the relevant technical field will understand that various modifications and changes can be made to the invention without departing from the spirit and technical scope of the invention as set forth in the claims below. Accordingly, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be determined by the claims. Explanation of the symbols

[0189] DP: Display panel LED: Light-emitting element CCL: Light control layer CFL: Color filter layer CF1: 1st color filter CF2: 2nd color filter

Claims

Claim 1 A light-emitting element that outputs source light, comprising a first electrode, a light-emitting layer disposed on the first electrode, and a second electrode disposed on the light-emitting layer; a light control layer disposed on the light-emitting element, comprising a first light control pattern that converts the source light into a first light and a second light control pattern that transmits the source light; and a color filter layer disposed on the light control layer, comprising a first color filter that overlaps the first light control pattern and a second color filter that overlaps the second light control pattern. A display panel comprising, wherein the light transmittance of the first color filter in a wavelength range of 600 nm to 640 nm is 70% or less, the light transmittance of the second color filter in a wavelength range of 430 nm to 470 nm is 75% or less, the first color filter comprises a red pigment and a black pigment, wherein the black pigment is included in an amount of 1% or less by weight relative to the total weight of the red pigment and the black pigment, and the second color filter comprises a blue pigment and a purple pigment, wherein the weight ratio of the blue pigment and the purple pigment is 70:30 to 80:

20. Claim 2 In claim 1, the first color filter is a display panel including a point where the light transmittance is 10% in a wavelength range greater than 590 nm and less than or equal to 610 nm. Claim 3 In paragraph 2, the first color filter is a display panel having a transmittance of less than 10% in a wavelength range of 590 nm or less. Claim 4 In paragraph 2, the display panel wherein the transmittance of the first color filter and the second color filter is measured through an LCF-2100QD spectrometer. Claim 5 A display panel according to claim 1, wherein the full width at half maximum of the light transmittance spectrum of the second color filter is 95 nm or less. Claim 6 In claim 5, the wavelength of the first light is longer than the wavelength of the source light, and the first light control pattern is a display panel including a first quantum dot that converts the source light into the first light. Claim 7 delete Claim 8 delete Claim 9 delete Claim 10 A display panel according to claim 1, wherein the thickness of the first color filter is 3 micrometers or more and 5.5 micrometers or less, and the thickness of the second color filter is 1.8 micrometers or more and 4.2 micrometers or less. Claim 11 A display panel according to claim 1, further comprising: a base substrate disposed below the light-emitting layer; and a base layer disposed on the color filter layer. Claim 12 A display panel according to claim 11, further comprising an anti-reflective layer disposed on the base layer. Claim 13 In claim 12, the light-emitting layer is a display panel that receives unpolarized incident light from the upper part of the anti-reflection layer. Claim 14 A display panel according to claim 1, wherein the color filter layer further comprises a low-refractive index layer disposed between the first color filter and the second color filter and the light control layer, and the refractive index of the low-refractive index layer is 1.3 or less. Claim 15 In claim 1, the light-emitting element is disposed between the first electrode and the second electrode, and the display panel comprises a plurality of light-emitting stacks, each including the light-emitting layer. Claim 16 In claim 15, the plurality of light-emitting stacks comprises: a first light-emitting stack disposed on the first electrode and including a first light-emitting layer; a charge-generating layer disposed on the first light-emitting stack; and a second light-emitting stack disposed on the charge-generating layer and including a second light-emitting layer, wherein the first light-emitting layer emits light of a color different from that of the second light-emitting layer. Claim 17 A light control layer comprising a first light control pattern including quantum dots that convert the wavelength of incident light, and a second light control pattern that transmits the incident light; and a color filter layer disposed on the light control layer and comprising a first color filter superimposed on the first light control pattern and a second color filter superimposed on the second light control pattern; An optical member comprising, wherein the light transmittance of the first color filter in a wavelength range of 600 nm to 640 nm is 70% or less, the light transmittance of the second color filter in a wavelength range of 430 nm to 470 nm is 75% or less, the first color filter comprises a red pigment and a black pigment, wherein the black pigment is included in an amount of 1% or less by weight relative to the total weight of the red pigment and the black pigment, and the second color filter comprises a blue pigment and a purple pigment, wherein the weight ratio of the blue pigment and the purple pigment is 70:30 to 80:

20. Claim 18 In claim 17, the optical member in which the thickness of the first color filter is greater than the thickness of the second color filter. Claim 19 An optical member according to claim 17, wherein the thickness of the first color filter is 3 micrometers or more and 5.5 micrometers or less, and the thickness of the second color filter is 1.8 micrometers or more and 4.2 micrometers or less. Claim 20 An optical member according to claim 17, wherein the half-width of the second color filter is 95 nm or less. Claim 21 A lower panel comprising a display element layer that outputs source light and an encapsulation layer disposed on the display element layer; an upper panel disposed on the lower panel; and a filling layer disposed between the lower panel and the upper panel; wherein the upper panel is disposed on the filling layer and comprises a light control layer comprising a first light control pattern that converts the source light into a first light and a second light control pattern that transmits the source light; and a color filter layer disposed on the light control layer and comprising a first color filter superimposed on the first light control pattern and a second color filter superimposed on the second light control pattern. A display panel having a thickness of 3 micrometers or more and 5.5 micrometers or less for the first color filter, a thickness of 1.8 micrometers or more and 4.2 micrometers or less for the second color filter, wherein the first color filter comprises a red pigment and a black pigment, and the black pigment comprises 1% by weight or less relative to the total weight of the red pigment and the black pigment, and the second color filter comprises a blue pigment and a purple pigment, and the weight ratio of the blue pigment and the purple pigment is 70:30 to 80:

20. Claim 22 In claim 21, a display panel comprising an anti-reflection layer disposed on the color filter layer, wherein the display element layer receives unpolarized incident light from the upper portion of the anti-reflection layer.

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