Display device and manufacturing method of display device

Abstract

The present application relates to a display device and a method of manufacturing a display device. The display device includes a base substrate, a plurality of display elements, a first light control layer, and a second light control layer. The base substrate includes a pixel region and a peripheral region adjacent to the pixel region. The display elements are disposed on the base substrate, overlap the pixel region in a plan view, and are configured to generate first light. The first light control layer is disposed on the display elements and includes a transmission portion configured to transmit the first light, a first light conversion portion configured to convert the first light into second light, and a second light conversion portion configured to convert the first light into third light. At least a portion of the second light control layer overlaps the first light conversion portion in a plan view and is configured to convert the first light into the second light.

Description

[0001] Cross-references to related applications

[0002] This application claims priority and benefit to Korean Patent Application No. 10-2019-0033840, filed on March 25, 2019, which is incorporated herein by reference for all purposes as if fully set forth herein. Technical Field

[0003] The exemplary embodiments generally relate to display devices and methods of manufacturing display devices, and more specifically, to display devices having improved light efficiency and methods of manufacturing the display devices. Background Technology

[0004] Display devices may include transmissive display panels that selectively transmit source light generated from a light source and luminescent display panels that generate source light from the display panel itself. The display panel may include different types of color control layers depending on the pixels to generate color images. These color control layers may transmit only a portion of the source light within a certain wavelength range, or they may convert the color of the source light. Some color control layers may not change the color of the source light, but may alter the properties of the light.

[0005] The information disclosed in this section is only for understanding the background of the inventive concept and therefore may include information that does not form prior art. Summary of the Invention

[0006] Some exemplary implementations can provide display devices with improved light efficiency by increasing some light conversion efficiency.

[0007] Some exemplary implementations can provide a method for manufacturing a display device that can increase the light efficiency of the display device by adding simple processes.

[0008] Other aspects will be set forth in the following detailed description and will be apparent in part from this disclosure, or may be learned by practice of the inventive concept.

[0009] According to some exemplary embodiments, a display device includes a substrate, a plurality of display elements, a first light control layer, and a second light control layer. The substrate includes pixel regions and peripheral regions adjacent to the pixel regions. The plurality of display elements are disposed on the substrate, overlap with the pixel regions in a plan view, and are configured to generate first light. The first light control layer is disposed on the plurality of display elements and includes a transmissive portion configured to transmit the first light, a first light conversion portion configured to convert the first light into second light, and a second light conversion portion configured to convert the first light into third light. At least a portion of the second light control layer overlaps with the first light conversion portion in a plan view and is configured to convert the first light into second light.

[0010] According to some exemplary embodiments, a display device includes a substrate, a display element, a first light control layer, and a second light control layer. The substrate includes pixel regions and peripheral regions adjacent to the pixel regions. The display element is disposed on the substrate and overlaps with the pixel regions in a planar view. The display element is configured to generate first light. The first light control layer is disposed on the display element and overlaps with the pixel regions in a planar view. The first light control layer is configured to convert the first light into second light. The second light control layer includes a portion overlapping the first light control layer in a planar view. The second light control layer is configured to convert the first light into second light.

[0011] According to some exemplary embodiments, a method of manufacturing a display device includes preparing an upper display substrate, preparing a lower display substrate, and connecting the upper and lower display substrates to each other. The upper display substrate includes a first pixel region, a second pixel region, and a third pixel region, as well as a peripheral region adjacent to the first, second, and third pixel regions. The lower display substrate includes a plurality of display elements configured to generate first light. Preparing the upper display substrate includes preparing a base substrate, forming a first light control layer on the surface of the base substrate, and forming a second light control layer on the first light control layer. The first light control layer includes a transmissive portion, a first light conversion portion, and a second light conversion portion. The transmissive portion corresponds to the first pixel region and is configured to transmit the first light; the first light conversion portion corresponds to the second pixel region and is configured to convert the first light into second light; and the second light conversion portion corresponds to the third pixel region and is configured to convert the first light into third light. The second light control layer is configured to convert the first light into second light.

[0012] The preceding general description and the following detailed description are exemplary and illustrative and are intended to provide further explanation of the claimed subject. Attached Figure Description

[0013] The accompanying drawings illustrate exemplary embodiments of the inventive concept and, together with the specification, serve to explain the principles of the inventive concept. The drawings are included to provide a further understanding of the inventive concept and are incorporated in and constitute a part of this specification. In the drawings:

[0014] Figure 1 This is a perspective view of a display device according to some exemplary embodiments;

[0015] Figure 2 This is a plan view of a display device according to some exemplary embodiments;

[0016] Figure 3 It is according to some exemplary implementations along Figure 2 The sectional view taken by section line I-I';

[0017] Figure 4It is according to some exemplary implementations along Figure 2 A sectional view of the display device taken by section line I-I';

[0018] Figure 5 It is according to some exemplary implementations along Figure 2 A sectional view of the display device taken by section line I-I';

[0019] Figure 6 It is according to some exemplary implementations along Figure 2 A sectional view of the display device taken by section line I-I';

[0020] Figure 7A , Figure 7B , Figure 7C and Figure 7D It is based on the various exemplary embodiments and Figure 3 The sectional view corresponding to region A;

[0021] Figure 8 This is a plan view of a display device according to some exemplary embodiments;

[0022] Figure 9 It is according to some exemplary implementations along Figure 8 The sectional view taken by section line II-II';

[0023] Figure 10 It is an equivalent circuit diagram of a pixel according to some exemplary embodiments;

[0024] Figure 11 This is a cross-sectional view showing a portion of the display panel according to some exemplary embodiments;

[0025] Figure 12A , Figure 12B , Figure 12C and Figure 12D These are cross-sectional views of display devices at various manufacturing stages according to some exemplary embodiments; and

[0026] Figure 13 This is a cross-sectional view of a display device in the manufacturing stage according to some exemplary embodiments. Detailed Implementation

[0027] In the following description, numerous specific details are set forth for purposes of explanation in order to provide a thorough understanding of the exemplary embodiments. As used herein, the terms “implementation” and “example” are used interchangeably and are non-limiting examples employing one or more of the inventive concepts disclosed herein. However, it will be apparent that the exemplary embodiments may be implemented without these specific details or with one or more equivalent arrangements. In other instances, well-known structures and devices are illustrated in block diagram form to avoid unnecessarily obscuring the exemplary embodiments. Furthermore, the exemplary embodiments may be different, but not necessarily exclusive. For example, a particular shape, configuration, and characteristic of an exemplary embodiment may be used or implemented in another exemplary embodiment without departing from the inventive concept.

[0028] Unless otherwise indicated, the exemplary embodiments shown are to be understood as providing exemplary features of some of the variable details of the exemplary embodiments. Therefore, unless otherwise indicated, the features, components, modules, layers, films, panels, regions, aspects, etc. (hereinafter individually or collectively referred to as “elements”) of the various schematic diagrams may be combined, separated, interchanged and / or rearranged without departing from the inventive concept.

[0029] In the accompanying drawings, the use of section lines and / or shading is generally used to clarify the boundaries between adjacent elements. Thus, unless otherwise specified, the presence or absence of section lines or shading does not convey or indicate any preference or requirement for a particular material, material properties, size, scale, commonalities between the elements shown, and / or any other characteristics, properties, or characteristics of the elements. Furthermore, in the accompanying drawings, the dimensions and relative dimensions of elements may be enlarged for clarity and / or descriptive purposes. Thus, the dimensions and relative dimensions of individual elements are not necessarily limited to those shown in the drawings. When exemplary embodiments can be performed differently, a particular process sequence may be performed differently than the sequence described. For example, two consecutively described processes may be performed substantially simultaneously or in the reverse order of their description. Additionally, the same reference numerals denote the same elements.

[0030] When an element, such as a layer, is referred to as being "on," "connected to," or "attached to" another element, it may be directly on, directly connected to, or directly attached to the other element, or there may be an intermediate element. However, when an element is referred to as being directly "on," "directly connected to," or "directly attached to" another element, there is no intermediate element. Additionally, for the purposes of this disclosure, the phrase "directly in contact" means that no additional element is added between elements that are in direct contact. For example, a first element that is "directly in contact" with a second element may mean that the first element is disposed on the second element, and there is no additional element, such as an adhesive member, between the first element and the second element.

[0031] Other terms and / or phrases used to describe relationships between elements should be interpreted in the same manner, such as “between” vs. “directly between”, “adjacent” vs. “directly adjacent”, “on” vs. “directly on”, etc. Furthermore, the term “connection” can refer to a physical, electrical, and / or fluid connection. Moreover, the DR1 axis, DR2 axis, and DR3 axis are not limited to the three axes of a Cartesian coordinate system and can be interpreted in a broader sense. For example, the DR1 axis, DR2 axis, and DR3 axis can be perpendicular to each other, or can represent different directions that are not perpendicular to each other. For the purposes of this disclosure, “at least one of X, Y, and Z” and “at least one selected from the group consisting of X, Y, and Z” can be interpreted as only X, only Y, only Z, or any combination of two or more of X, Y, and Z, such as, for example, XYZ, XYY, YZ, and ZZ. As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items.

[0032] Although the terms “first,” “second,” etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another. Therefore, without departing from the teachings of this disclosure, the first element discussed below may be referred to as the second element.

[0033] Spatial relative terms, such as “beneath,” “below,” “under,” “lower,” “above,” “upper,” “over,” “higher,” and “side” (e.g., as in “sidewall”), may be used herein for descriptive purposes and are therefore used to describe the relationship of one element to another(s) as shown in the accompanying drawings. In addition to the orientations depicted in the drawings, spatial relative terms are intended to cover different orientations of the device in use, operation, and / or manufacture. For example, if the device in the drawings is flipped, an element described as “below” or “under” other elements or features would then be oriented “above” those other elements or features. Thus, the exemplary term “below” may cover both above and below orientations. Furthermore, the device may be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and for this reason, the spatial relative descriptive terms used herein should be interpreted accordingly.

[0034] The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, the singular forms “a,” “an,” and “described” are intended to include the plural forms unless the context clearly indicates otherwise. Furthermore, when used in this specification, the terms “comprises,” “comprising,” “includes,” and / or “including” indicate the presence of the described features, integrals, steps, operations, elements, components, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof. It is also noteworthy that, as used herein, the terms “substantially,” “about,” and other similar terms are used as approximate terms rather than as terms of degree, and therefore, allowances are made for inherent deviations in measured, calculated, and / or provided values ​​that will be apparent to those skilled in the art.

[0035] Various exemplary embodiments are described herein with reference to sectional views, isometric views, perspective views, plan views, and / or exploded views, which are schematic diagrams of idealized exemplary embodiments and / or intermediate structures. Thus, variations in shape from the illustrations should be contemplated due to, for example, manufacturing techniques and / or tolerances. Therefore, the exemplary embodiments disclosed herein should not be construed as limited to the shapes of the areas specifically shown, but rather include shape deviations caused, for example, by manufacturing processes. For this purpose, the areas shown in the figures may be schematic in nature, and the shapes of these areas may not reflect the actual shapes of the areas of the device, and are therefore not intended to be limiting.

[0036] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Terms, such as those as defined in common dictionaries, shall be interpreted as having the meaning consistent with their meaning in the context of the relevant field and shall not be interpreted in an idealized or overly formal sense unless expressly defined herein.

[0037] As is customary in the art, exemplary embodiments of functional blocks, units, and / or modules are shown and described in the accompanying drawings. Those skilled in the art will understand that these blocks, units, and / or modules are physically implemented by electrical (or optical) circuitry such as logic circuits, discrete components, microprocessors, hardwired circuits, memory elements, wiring connectors, etc., which can be formed using semiconductor-based or other manufacturing techniques. Where blocks, units, and / or modules are implemented using microprocessors or other similar hardware, they can be programmed and controlled using software (e.g., microcode) to perform the various functions discussed herein, and optionally driven by firmware and / or software. It is also contemplated that each block, unit, and / or module can be implemented by dedicated hardware, or as a combination of dedicated hardware for performing some functions and a processor (e.g., one or more programmable microprocessors and associated circuitry) for performing other functions. Furthermore, without departing from the inventive concept, each block, unit, and / or module of some exemplary embodiments may be physically separated into two or more interactive and discrete blocks, units, and / or modules. Furthermore, without departing from the inventive concept, some exemplary embodiments of blocks, units, and / or modules may be physically combined into more complex blocks, units, and / or modules.

[0038] In the following sections, various exemplary embodiments will be explained in detail with reference to the accompanying drawings.

[0039] Figure 1 This is a perspective view of a display device according to some exemplary embodiments. Figure 2 This is a plan view of a display device according to some exemplary embodiments. Figure 3 It is according to some exemplary implementations along Figure 2 The sectional view taken by section line II′.

[0040] refer to Figure 1 The display device DD includes a display element OLED, a first light control layer CCL1 disposed on the display element OLED, and a second light control layer CCL2.

[0041] According to some exemplary embodiments, the display element OLED can be an organic light-emitting diode OLED as a self-emissive element, and the organic light-emitting diode OLED can generate first light. For example, the first light provided by the organic light-emitting diode OLED can be blue light, and the blue light can be light corresponding to light in the wavelength region of 410 nm to 480 nm.

[0042] The display device DD may further include a first substrate SUB1 and a second substrate SUB2 arranged facing each other, and an organic light-emitting diode (OLED) may be disposed on the second substrate SUB2.

[0043] refer to Figure 2 In some exemplary embodiments, the display device DD may include a display area DA for displaying images and a non-display area NDA for not displaying images. The non-display area NDA may be located outside the display area DA (e.g., on the outer periphery of the display area DA).

[0044] The display device DD may have a quadrilateral shape having a plane defined by an axis of a first direction DR1 and an axis of a second direction DR2; however, exemplary embodiments are not limited thereto. The shape of the display area DA and the shape of the non-display area NDA may be designed in relation to each other.

[0045] Although Figure 2 In the illustration, the display device DD is shown as having a flat display surface, but exemplary embodiments are not limited thereto. In some exemplary embodiments, the display device DD may include a curved display surface or a three-dimensional display surface. A three-dimensional display surface may include multiple display areas indicating different directions, and may, for example, include a display surface of the polygonal column type.

[0046] The display area DA may include multiple pixel areas Pxa-B, Pxa-G, and Pxa-R. Pixel areas Pxa-B, Pxa-G, and Pxa-R may be defined by, for example, multiple gate lines and multiple data lines. Pixel areas Pxa-B, Pxa-G, and Pxa-R may be arranged in a matrix. Pixels, which will be described later, may be disposed in each of pixel areas Pxa-B, Pxa-G, and Pxa-R.

[0047] The display device DD may include a first pixel region, a second pixel region, and a third pixel region arranged adjacent to each other in a planar view and emitting light of different wavelengths. In some exemplary embodiments, the first pixel region may be a blue pixel region Pxa-B, the second pixel region may be a green pixel region Pxa-G, and the third pixel region may be a red pixel region Pxa-R. For example, in some exemplary embodiments, the display device DD may include a blue pixel region Pxa-B, a green pixel region Pxa-G, and a red pixel region Pxa-R. The blue pixel region Pxa-B may be a blue emitting region for emitting blue light, and the green pixel region Pxa-G and the red pixel region Pxa-R may represent the green emitting region and the red emitting region, respectively.

[0048] In some exemplary embodiments, the display device DD may be a rigid display device, but the exemplary embodiments are not limited thereto. According to some exemplary embodiments, the display device DD may be a flexible display device or a hybrid rigid and flexible display device.

[0049] refer to Figure 3Some exemplary embodiments of the display device DD may include a first substrate SUB1 and a second substrate SUB2 facing each other. The first substrate SUB1 and the second substrate SUB2 may be at least one of a polymer substrate, a plastic substrate, a glass substrate, and a quartz substrate. Each of the first substrate SUB1 and the second substrate SUB2 may be a transparent insulating substrate. Each of the first substrate SUB1 and the second substrate SUB2 may be rigid. Each of the first substrate SUB1 and the second substrate SUB2 may be flexible. Figure 3 In the illustration, the display device DD is shown as including a first substrate SUB1 and a second substrate SUB2; however, the exemplary embodiment is not limited thereto. For example, at least one of the first substrate SUB1 and the second substrate SUB2 may be omitted.

[0050] The display device DD may include a circuit layer CL disposed on a second substrate SUB2. Reference will be made below. Figure 11 A more detailed description of the circuit layer CL.

[0051] In some exemplary embodiments, the display device DD may include a first organic light-emitting diode (OLED) overlapping with a first pixel region Pxa-B, a second organic light-emitting diode (OLED) overlapping with a second pixel region Pxa-G, and a third organic light-emitting diode (OLED) overlapping with a third pixel region Pxa-R.

[0052] Each of the first to third organic light-emitting diodes (OLEDs) may include a first electrode EL1, a hole transport region HTR, an emissive layer EML, an electron transport region ETR, and a second electrode EL2, which are stacked sequentially.

[0053] The emissive layer (EML) of the first to third organic light-emitting diode (OLED) OLEDs has a uniform shape and can be commonly disposed in the first pixel region Pxa-B, the second pixel region Pxa-G, the third pixel region Pxa-R, and the peripheral region NPxa. The emissive layer EML can generate first light. For example, the emissive layer EML can generate blue light.

[0054] An encapsulation component TFE is disposed on and encapsulates an organic light-emitting diode (OLED). The encapsulation component TFE may include an inorganic film IL disposed on its outermost periphery. The encapsulation component TFE may also include an organic film OL, or may have a structure in which the inorganic film IL and the organic film OL are alternately repeated. The encapsulation component TFE serves to protect the OLED from moisture and / or oxygen and from foreign matter such as dust particles.

[0055] In some exemplary embodiments, the inorganic film IL may include any material capable of protecting the organic light-emitting diode (OLED), without any particular limitations; for example, it may include silicon nitride (SiN). x ), silicon nitride oxide (SiO) y N x ), silicon oxide (SiO) y ), titanium oxide (TiO) y ), aluminum oxide (AlO) y At least one of the following:

[0056] Organic films (OL) may include acrylate-based organic materials, but are not particularly limited thereto. Inorganic films (IL) can be formed by deposition methods, etc., and organic films (OL) can be formed by deposition methods, coating methods, etc.

[0057] A display device DD according to some exemplary embodiments includes a first light control layer CCL1 and a second light control layer CCL2.

[0058] The first light control layer CCL1 includes a transmissive section TP that transmits first light, a first light conversion section CCP1 that converts the first light into second light, and a second light conversion section CCP2 that converts the first light into third light. For example, the second light can be green light, and the green light can be light corresponding to the wavelength region of 500 nm to 570 nm. The third light can be red light, and the red light can be light corresponding to the wavelength region of 625 nm to 675 nm.

[0059] The first light conversion unit CCP1 and the second light conversion unit CCP2 may include light emitters. The light emitters may be particles that convert the wavelength of light. In some exemplary embodiments, the light emitters included in the first light conversion unit CCP1 and the second light conversion unit CCP2 may be quantum dots, but the exemplary embodiments are not limited thereto.

[0060] Quantum dots are materials with a crystal structure of a few nanometers in size and composed of hundreds to thousands of atoms. Due to their small size, quantum dots exhibit a quantum confinement effect that increases the band gap. When light with a wavelength having energy higher than the band gap is incident on a quantum dot, the quantum dot is excited by absorbing the light and returns to its ground state by emitting light of another (e.g., a specific) wavelength. The wavelength of the emitted light has a value corresponding to the band gap. By adjusting the size and composition of the quantum dot, the luminescence properties caused by the quantum confinement effect can be tuned.

[0061] Quantum dots can be selected from at least one of group II-VI compounds, group III-V compounds, group IV-VI compounds, group IV elements, group IV compounds and / or any combination thereof.

[0062] Group II-VI compounds may be selected from the group consisting of: binary compounds selected from the group consisting of at least one of CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS and / or compounds comprising binary elements; and compounds consisting of CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdH Ternary compounds selected from the group consisting of at least one of gSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS and / or combinations of ternary compounds, and quaternary compounds selected from the group consisting of at least one of HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe and / or combinations of quaternary compounds.

[0063] Group III-V compounds may be selected from the group consisting of: binary compounds selected from the group consisting of at least one of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb and / or binary compounds; and compounds consisting of GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs. Ternary compounds selected from the group consisting of at least one of the ternary element compounds, InPSb, and / or combinations of ternary element compounds, and quaternary compounds selected from the group consisting of at least one of the quaternary element compounds, InPSb, InAlNP, InAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, and / or combinations of at least one of the quaternary element compounds.

[0064] Group IV-VI compounds may be selected from the group consisting of: binary compounds selected from the group consisting of combinations of at least one of SnS, SnSe, SnTe, PbS, PbSe, PbTe and / or compounds comprising binary elements; ternary compounds selected from the group consisting of combinations of at least one of SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe and / or compounds comprising ternary elements; and quaternary compounds selected from the group consisting of combinations of at least one of SnPbSSe, SnPbSeTe, SnPbSTe and / or compounds comprising quaternary elements. Group IV elements may be selected from the group consisting of Si, Ge and mixtures thereof. Group IV compounds may be binary compounds selected from the group consisting of SiC, SiGe and mixtures thereof.

[0065] In some exemplary embodiments, binary, ternary, or quaternary compounds may be present in particles having a uniform concentration distribution, or may be present in the same particles having locally different concentrations.

[0066] Quantum dots can have a core-shell structure, comprising a core and a shell surrounding the core. Furthermore, quantum dots can have a core-shell structure where one quantum dot surrounds another. The interface between the core and shell can have a concentration gradient in which the concentration of elements present in the shell decreases towards the center.

[0067] Quantum dots can be particles with a nanometer size. Quantum dots can have a full width at half maximum (FWHM) of an emission wavelength spectrum of about 45 nm or smaller (e.g., about 40 nm or smaller (e.g., about 30 nm or smaller)), and can improve color purity or color reproducibility within this range. Furthermore, light emitted through such quantum dots is emitted in all directions, thus improving wide viewing angles.

[0068] Furthermore, the form of quantum dots is not particularly limited. For example, quantum dots can be in the form commonly used in the art. For example, quantum dots in the form of spheres, cones, multi-arms, or cubic nanoparticles, nanotubes, nanowires, nanofibers, nanoparticles, etc., can be used.

[0069] Quantum dots can change the color of emitted light depending on their particle size. For example, the particle size of the quantum dots included in the first light conversion unit CCP1 can be smaller than the particle size of the quantum dots included in the second light conversion unit CCP2. In this way, the quantum dots included in the first light conversion unit CCP1 can emit light with a shorter wavelength than the quantum dots included in the second light conversion unit CCP2.

[0070] In some exemplary embodiments, the first light control layer CCL1 may include a substrate resin and a light emitter. The first light control layer CCL1 may also include scattering particles. The light emitter and scattering particles may be included in only a portion of the first light control layer CCL1. In some exemplary embodiments, the transmissive portion TP may not include a light emitter, but may include scattering particles. The first light conversion portion CCP1 and the second light conversion portion CCP2 may include both a light emitter and scattering particles.

[0071] The first optical control layer CCL1 may include a transmissive section TP and multiple optical conversion sections CCP1 and CCP2. In some exemplary embodiments, each of the transmissive section TP, the first optical conversion section CCP1, and the second optical conversion section CCP2 may be spaced apart from each other in a plan view. (See reference...) Figure 3 Each of the transmission section TP, the first light conversion section CCP1, and the second light conversion section CCP2 can be spaced apart from each other in a planar view defined by the axis of the first direction DR1 and the axis of the third direction DR3.

[0072] The transmissive part TP can be configured to correspond to the first pixel region Pxa-B, the first light conversion part CCP1 can be configured to correspond to the second pixel region Pxa-G, and the second light conversion part CCP2 can be configured to correspond to the third pixel region Pxa-R.

[0073] like Figure 3 As seen, the transmissive portion TP, the first light conversion portion CCP1, and the second light conversion portion CCP2 are shown to have the same area or the same thickness. However, the exemplary embodiment is not limited thereto. The transmissive portion TP, the first light conversion portion CCP1, and the second light conversion portion CCP2 may have different areas and / or different thicknesses. For example, the second light conversion portion CCP2 may have a larger area than the transmissive portion TP and the first light conversion portion CCP1. In some exemplary embodiments, the transmissive portion TP may have a smaller area than the first light conversion portion CCP1 and the second light conversion portion CCP2.

[0074] The light-blocking pattern BP can be disposed between the spaced-apart transmissive portion TP and the first light conversion portion CCP1, and / or between the first light conversion portion CCP1 and the second light conversion portion CCP2. For example... Figure 3 As seen, the light-blocking pattern BP is shown to be disposed between each of the transmissive portion TP, the first light conversion portion CCP1, and the second light conversion portion CCP2; however, the exemplary embodiment is not limited thereto. For example, in a display device DD according to some exemplary embodiments, the light-blocking pattern BP may be omitted.

[0075] At least a portion of the second light control layer CCL2 overlaps with the first light conversion section CCP1 in a plan view. In some exemplary embodiments, the second light control layer CCL2 overlaps with the first light conversion section CCP1 in a plan view, and may also overlap with the transmission section TP and the second light conversion section CCP2. The second light control layer CCL2 may completely overlap with the first light control layer CCL1 in a plan view.

[0076] In some exemplary embodiments, the second light control layer CCL2 may contact the first light control layer CCL1. The second light control layer CCL2 is disposed on the lower portion of the first light control layer CCL1 and may contact the lower surface of the first light control layer CCL1. The second light control layer CCL2 may contact the lower surface of the first light conversion portion CCP1 of the first light control layer CCL1.

[0077] The second light control layer CCL2 may have a refractive index substantially the same as that of the first light control layer CCL1. The second light control layer CCL2 may have a refractive index substantially the same as that of the first light conversion section CCP1. In some exemplary embodiments, the second light control layer CCL2 comprises the same base resin as the first light conversion section CCP1 and may have a refractive index substantially the same as that of the first light conversion section CCP1.

[0078] The second light control layer CCL2 can convert the first light into the second light. For example, the first light can be blue light, and the first light conversion unit CCP1 of the first light control layer CCL1 can convert blue light into green light, and the second light control layer CCL2 can also convert blue light into green light. However, the exemplary embodiment is not limited to this. The second light control layer CCL2 can convert blue light into red light in the same way as the second light conversion unit CCP2.

[0079] The second light control layer CCL2 may include a light emitter. The light emitter included in the second light control layer CCL2 may be a quantum dot. The light emitter included in the second light control layer CCL2 may convert first light into second light. For example, the light emitter included in the second light control layer CCL2 may be the same light emitter included in the first light conversion unit CCP1, and may convert blue light into green light. However, exemplary embodiments are not limited thereto. The light emitter included in the second light control layer CCL2 may be the same light emitter included in the second light conversion unit CCP2, and may convert blue light into red light. Alternatively, the second light control layer CCL2 may include both a light emitter that converts blue light into red light and a light emitter that converts blue light into green light. In some exemplary embodiments, the second light control layer CCL2 may not include a light emitter, but may include scattering particles instead.

[0080] In some exemplary embodiments, the display device DD may include a color filter layer CFL. The color filter layer CFL may be disposed on the first light control layer CCL1 and may include a first color filter portion B-CFP, a second color filter portion G-CFP, a third color filter portion R-CFP, and a light blocking member BM.

[0081] In some exemplary embodiments, the first color filter section B-CFP, the second color filter section G-CFP, and the third color filter section R-CFP may be spaced apart from each other in a plan view. (See reference) Figure 3 The first color filter section B-CFP, the second color filter section G-CFP, and the third color filter section R-CFP can be spaced apart from each other along the first direction DR1.

[0082] The first color filter section B-CFP can be configured to correspond to the transmission section TP and transmit the first light. The second color filter section G-CFP can be configured to correspond to the first light conversion section CCP1, block the first light, and transmit the second light. The third color filter section R-CFP can be configured to correspond to the second light conversion section CCP2, block the first light, and transmit the third light. By including a color filter layer CFL in the display device DD, external light reflection can be effectively reduced, and color mixing can be prevented or at least reduced.

[0083] A light-blocking member BM is provided corresponding to the surrounding area NPxa. The light-blocking member BM can be formed using an organic or inorganic light-blocking material, both of which include black pigment or black dye. The light-blocking member BM prevents (or at least reduces) light leakage and distinguishes the boundaries between adjacent color filter sections. At least a portion of the light-blocking member BM can be configured to overlap with an adjacent color filter section. For example, in a plan view defined by the axis of the first direction DR1 and the axis of the third direction DR3, the light-blocking member BM can be provided such that at least a portion of the light-blocking member BM can overlap with an adjacent color filter section in the first direction DR1. Figure 3 As seen, the light-blocking member BM is exemplarily shown to completely overlap with the corresponding color filter portion in the first direction DR1, such that the thickness of the light-blocking member BM is the same as the thickness of the entire color filter layer CFL. However, the exemplary embodiment is not limited thereto. The thickness of the light-blocking member BM may be less than the thickness of the entire color filter layer CFL. In some exemplary embodiments, the light-blocking member BM is disclosed to be included in the color filter layer CFL. However, the exemplary embodiment is not limited thereto. The light-blocking member BM may be omitted.

[0084] The filler layer BFL can be disposed between the encapsulation component TFE and the second light control layer CCL2. The filler layer BFL can be disposed between the encapsulation component TFE and the second light control layer CCL2 to prevent the second light control layer CCL2 from contacting the encapsulation component TFE and to improve the light extraction efficiency of the display device DD.

[0085] In some exemplary embodiments, the filler layer BFL may be filled between the encapsulation member TFE and the second optical control layer CCL2. Filling between the encapsulation member TFE and the second optical control layer CCL2 can mean that the space between the encapsulation member TFE and the second optical control layer CCL2 is filled with the filler layer BFL such that there is no internal space between the encapsulation member TFE and the second optical control layer CCL2, and the filler layer BFL contacts the encapsulation member TFE and the second optical control layer CCL2.

[0086] The filler layer BFL prevents the light emitters and / or scattering particles included in the second light control layer CCL2 from oxidation by the internal air, and thus maintains the light extraction efficiency of the display device DD without significant changes.

[0087] In some exemplary embodiments, the filler layer BFL may be directly disposed on the inorganic film IL, which is disposed on the outermost periphery of the encapsulation member TFE. The filler layer BFL may include inorganic binders, organic binders, or liquid crystal compounds, but is not particularly limited thereto.

[0088] like Figure 3 As seen, the filler layer BFL is exemplarily shown as being disposed between the encapsulation member TFE and the second light control layer CCL2, but the exemplary embodiment is not limited thereto. In a display device DD according to some exemplary embodiments, the filler layer BFL may be omitted. In this case, the second light control layer CCL2 may be disposed directly on the upper surface of the encapsulation member TFE, for example, directly on the inorganic film IL of the encapsulation member TFE.

[0089] According to various exemplary embodiments, regarding the first light conversion unit that converts first light into second light, the display device may include a second light control layer that overlaps with the first light conversion unit in a plan view. Furthermore, the second light control layer may convert the first light into second light in the same manner as the first light conversion unit. Therefore, the display device according to some exemplary embodiments can increase the light conversion efficiency of light having a specific wavelength or wavelength range. This increases the overall light efficiency of the display device.

[0090] Figures 4 to 6 These are cross-sectional views of display devices according to various exemplary embodiments. Figures 4 to 6 The display devices DD-1, DD-2, and DD-3 shown herein exhibit a similarity to... Figure 2The section corresponding to section line II′. In the following text, in... Figures 4 to 6 In the description, refer to Figure 3 The described elements are given the same reference numerals and descriptions of repeating components are largely omitted.

[0091] refer to Figure 4 In the display device DD-1 according to some exemplary embodiments, a second light control layer CCL2-1 may be disposed between the color filter layer CFL and the first light control layer CCL1. The second light control layer CCL2-1 may be disposed such that at least a portion of the second light control layer CCL2-1 overlaps with the first light conversion unit CCP1 and the second color filter unit G-CFP. Between the color filter layer CFL and the first light control layer CCL1, the second light control layer CCL2-1 may be disposed such that at least a portion of the second light control layer CCL2-1 can contact the upper surface of the first light conversion unit CCP1.

[0092] refer to Figure 5 In the display device DD-2 according to some exemplary embodiments, the second light control layer CCL2-2 may include a first sub-light conversion unit CCL2-SUB1 and a second sub-light conversion unit CCL2-SUB2.

[0093] The first sub-light conversion unit CCL2-SUB1 can completely overlap with the first light conversion unit CCP1 in a planar view. The first sub-light conversion unit CCL2-SUB1 and the first light conversion unit CCP1 can be patterned so that they completely overlap with the second pixel region Pxa-G and do not overlap with the surrounding region NPxa, the first pixel region Pxa-B, and the third pixel region Pxa-R.

[0094] The first sub-light conversion unit CCL2-SUB1 is contactable with the first light conversion unit CCP1. The first sub-light conversion unit CCL2-SUB1 can convert first light into second light in the same manner as the first light conversion unit CCP1. The first sub-light conversion unit CCL2-SUB1 may include a light emitter identical to that included in the first light conversion unit CCP1. For example, the first light conversion unit CCP1 may include a quantum dot that converts blue light into green light, and the first sub-light conversion unit CCL2-SUB1 may also include a quantum dot that converts blue light into green light.

[0095] The second sub-light conversion unit CCL2-SUB2 may not overlap with the first light conversion unit CCP1 in a planar view. The second sub-light conversion unit CCL2-SUB2 may overlap with the transmission unit TP and the second light conversion unit CCP2 in a planar view, and may include multiple scattering particles. The second sub-light conversion unit CCL2-SUB2 may not include the light emitter included in the first light conversion unit CCP1.

[0096] In the display device DD-2 according to some exemplary embodiments, the second light control layer CCL2-2 can be patterned and configured to overlap only with the first light conversion unit CCP1 in a plane. Since the second light control layer CCL2-2, which converts the first light into the second light, is configured to overlap only with the first light conversion unit CCP1 in a plane view and not with the transmissive unit TP and the second light conversion unit CCP2, the light conversion efficiency to the second light can be increased and color mixing can be prevented or at least reduced.

[0097] refer to Figure 6 The display device DD-3 according to some exemplary embodiments may also include at least one of a first cover layer CAP1 and a second cover layer CAP2.

[0098] In some exemplary embodiments, a capping layer may be disposed between the second light control layer CCL2 and the filler layer BFL, and / or between the first light control layer CCL1 and the color filter layer CFL. In some exemplary embodiments, a first capping layer CAP1 may be disposed on the upper surface of the first light control layer CCL1, for example, between the first light control layer CCL1 and the color filter layer CFL, and a second capping layer CAP2 may be disposed on the lower surface of the second light control layer CCL2, for example, between the second light control layer CCL2 and the filler layer BFL. The capping layer may be composed of an inorganic material, and the type of inorganic material is not particularly limited. The capping layer may be configured to surround the first light control layer CCL1 and the second light control layer CCL2, and protect the first light control layer CCL1 and the second light control layer CCL2.

[0099] Figures 7A to 7D It is based on the various exemplary embodiments and Figure 3 A sectional view of a portion corresponding to region A. See below for reference. Figures 7A to 7D The first optical conversion unit and the second optical control layer will be described in more detail below. Figures 7A to 7D In the description, the same reference numerals are given to the elements described above and repeated descriptions are mainly omitted.

[0100] refer to Figure 7A The first light conversion unit CCP1 may include a first light emitter EP1, a first scattering particle SC1, and a first substrate resin BR1. The second light control layer CCL2 may include a second light emitter EP2, a second scattering particle SC2, and a second substrate resin BR2.

[0101] The first base resin BR1 and the second base resin BR2 are media in which a light-emitting element is dispersed, and may be composed of various resin components commonly referred to as binders. However, exemplary embodiments are not limited thereto. In this specification, any medium may be referred to as a base resin as long as it is dispersible and contains a light-emitting element, regardless of name, additional function, constituent materials, etc. The base resin may be a polymer resin. For example, the base resin may be at least one of acrylic resin, urethane-based resin, silicone-based resin, and epoxy resin. The base resin may be a transparent resin.

[0102] The first substrate resin BR1 and the second substrate resin BR2 may have substantially the same refractive index. In some exemplary embodiments, the first substrate resin BR1 and the second substrate resin BR2 may be composed of the same material and may have substantially the same refractive index.

[0103] The first light emitter EP1 and the second light emitter EP2 can be particles that convert the wavelength of light. In some exemplary embodiments, the first light emitter EP1 and the second light emitter EP2 can be quantum dots.

[0104] The first light emitter EP1 and the second light emitter EP2 can be particles that convert first light into second light. In some exemplary embodiments, the first light emitter EP1 and the second light emitter EP2 can be quantum dots that convert blue light into green light. The first light emitter EP1 and the second light emitter EP2 can comprise the same material and can be quantum dots of the same size.

[0105] The first light emitter EP1 can be uniformly distributed in the first light conversion section CCP1. The second light emitter EP2 can be uniformly distributed in the second light control layer CCL2. The second light emitter EP2 can be uniformly distributed in the second light control layer CCL2, thereby distributing itself in relation to the second light conversion section CCP2 and the transmission section TP (see...). Figure 3 (overlapping areas)

[0106] The first scattering particle SC1 and the second scattering particle SC2 can be at least one of titanium dioxide (TiO2) and silicon-based nanoparticles, but the exemplary embodiments are not limited thereto. The first scattering particle SC1 and the second scattering particle SC2 can scatter light. The first scattering particle SC1 and the second scattering particle SC2 can comprise the same material. The first scattering particle SC1 and the second scattering particle SC2 can be the same particle. In some exemplary embodiments, the first scattering particle SC1 and the second scattering particle SC2 may be omitted.

[0107] refer to Figure 7B The second optical control layer may include a first sub-optical conversion unit CCL2-SUB1 and a second sub-optical conversion unit CCL2-SUB2.

[0108] The first sub-light conversion unit CCL2-SUB1 can be patterned to completely overlap with the first light conversion unit CCP1 in a planar view. The first sub-light conversion unit CCL2-SUB1 can contact the first light conversion unit CCP1.

[0109] The first sub-light conversion unit CCL2-SUB1 may include a second substrate resin BR2-1, a second light emitter EP2-1, and a second scattering particle SC2-1.

[0110] The second base resin BR2-1 may have substantially the same refractive index as the first base resin BR1. In some exemplary embodiments, the first base resin BR1 and the second base resin BR2-1 may be composed of the same material and may have substantially the same refractive index.

[0111] The second light emitter EP2-1 included in the first light conversion unit CCL2-SUB1 may be a particle that converts first light into second light in the same manner as the first light emitter EP1 included in the first light conversion unit CCP1. In some exemplary embodiments, the first light emitter EP1 and the second light emitter EP2-1 may be quantum dots that convert blue light into green light. The first light emitter EP1 and the second light emitter EP2-1 may include the same material and may be quantum dots of the same size.

[0112] The second sub-light conversion section CCL2-SUB2 may include a second substrate resin BR2-2 and a second scattering particle SC2-2. The second sub-light conversion section CCL2-SUB2 may not include a light emitter. For example, in a second light control layer according to some exemplary embodiments, the light emitter may be included only in the first sub-light conversion section CCL2-SUB1 that overlaps with the first light conversion section CCP1, but not in the second sub-light conversion section CCL2-SUB2 that does not overlap with the first light conversion section CCP1.

[0113] refer to Figure 7C The first light conversion section CCP1-1 may have a thickness smaller than that of the light blocking pattern BP. In cross-section (or in a sectional view), the height of the first light conversion section CCP1-1 may be less than or equal to the height of the light blocking pattern BP.

[0114] In some exemplary embodiments, the first sub-light conversion unit CCL2-SUB11 may be disposed in the ladder-shaped portion generated when the thickness of the first light conversion unit CCP1-1 is less than the thickness of the light blocking pattern BP. Figure 7CIn the diagram, the second light control layer is shown as being patterned to include a first sub-light conversion unit CCL2-SUB11 and a second sub-light conversion unit CCL2-SUB2. However, the exemplary embodiment is not limited thereto. The second light control layer may be a monolithically formed single layer. In cross-section, the sum of the heights of the first light conversion unit CCP1-1 and the first sub-light conversion unit CCL2-SUB11 may be greater than or equal to the height of the light blocking pattern BP.

[0115] refer to Figure 7D The intermediate portion CCP-M may be included between the first optical conversion unit CCP1-2 and the first sub-optical conversion unit CCL2-SUB12.

[0116] The intermediate portion CCP-M may include a base resin BR-M and scattering particles SC-M. The base resin BR-M included in the intermediate portion CCP-M may have the same refractive index as the first base resin BR1-2 included in the first light conversion section CCP1-2 and the second base resin BR2-1 included in the first sub-light conversion section CCL2-SUB12. The base resin BR-M may include the same material as the first base resin BR1-2 included in the first light conversion section CCP1-2 and the second base resin BR2-1 included in the first sub-light conversion section CCL2-SUB12. The intermediate portion CCP-M may not include a light emitter.

[0117] Figure 8 This is a plan view of a display device according to some exemplary embodiments. Figure 9 It is according to some exemplary implementations along Figure 8 The sectional view taken by section line II-II'. In the following text, in... Figure 8 and Figure 9 In the description, the same reference numerals are given to the elements described above and repeated descriptions are mainly omitted.

[0118] refer to Figure 8 and Figure 9 In the display device DD-4 according to some exemplary embodiments, the display area DA may include a plurality of pixel areas Pxa-B, Pxa-G, Pxa-R and Pxa-W.

[0119] In addition to the first pixel region, the second pixel region, and the third pixel region, the display device DD-4 may also include a fourth pixel region. In some exemplary embodiments, the first pixel region may be a blue pixel region Pxa-B, the second pixel region may be a green pixel region Pxa-G, the third pixel region may be a red pixel region Pxa-R, and the fourth pixel region may be a white pixel region Pxa-W. For example, in some exemplary embodiments, the display device DD-4 may include a blue pixel region Pxa-B, a green pixel region Pxa-G, a red pixel region Pxa-R, and a white pixel region Pxa-W. The blue pixel region Pxa-B may be a blue emitting region for emitting blue light, and the green pixel region Pxa-G and the red pixel region Pxa-R may represent a green emitting region for emitting green light and a red emitting region for emitting red light, respectively. The white pixel region Pxa-W may represent an area for emitting white light.

[0120] The first light control layer CCL1-1 may include a transmissive section TP that transmits first light, a first light conversion section CCP1 that converts the first light into a second light, a second light conversion section CCP2 that converts the first light into a third light, and a third light conversion section CCPW that converts the first light into a fourth light. The fourth light may be white light.

[0121] The third light conversion unit CCPW may include a light emitter. The light emitter included in the third light conversion unit CCPW may be a quantum dot. In some exemplary embodiments, the light emitter included in the third light conversion unit CCPW can convert first light into second light, and the light emitter included in the third light conversion unit CCPW can convert the first light into a third light. The light emitter included in the third light conversion unit CCPW can convert blue light into red light or green light. Alternatively, the third light conversion unit CCPW may include both a light emitter that converts blue light into red light and a light emitter that converts blue light into green light. In some exemplary embodiments, the third light conversion unit CCPW may be omitted.

[0122] In some exemplary embodiments, the display device DD-4 may further include a color filter layer CFL-1 disposed on the first light control layer CCL1-1, and the color filter layer CFL-1 may include a first color filter portion B-CFP, a second color filter portion G-CFP, a third color filter portion R-CFP, and a fourth color filter portion W-CFP, as well as a light blocking member BM.

[0123] The fourth color filter unit W-CFP is configured to correspond to the third light conversion unit CCPW and can transmit light corresponding to the visible light region. The fourth color filter unit W-CFP can have different transmittances depending on the wavelength of the light. In some exemplary embodiments, the fourth color filter unit W-CFP may be omitted.

[0124] Figure 10 This is an equivalent circuit diagram of a pixel according to some exemplary embodiments. Figure 11 This is a cross-sectional view showing a portion of the display panel according to some exemplary embodiments.

[0125] For example, Figure 10 The diagram shows scan lines GL, data lines DL, power lines PL, and pixels PX connected to scan lines GL, data lines DL, and power lines PL. The configuration of pixels PX is not limited to... Figure 10 The configuration shown is available and can be modified and executed.

[0126] Organic light-emitting diodes (OLEDs) can be front-emitting, bottom-emitting, or dual-emitting OLEDs. A pixel PX includes a first transistor T1 (e.g., a driving transistor), a second transistor T2 (e.g., a switching transistor), and a capacitor Cst, serving as a pixel driving circuit for driving the OLED. A first power supply voltage ELVDD is provided to the first transistor T1, and a second power supply voltage ELVSS is provided to the OLED. The second power supply voltage ELVSS can be a voltage lower than the first power supply voltage ELVDD.

[0127] The second transistor T2 outputs a data signal applied to the data line DL in response to a scan signal applied to the scan line GL. The capacitor Cst is charged with a voltage corresponding to the data signal received from the second transistor T2. The first transistor T1 is connected to the organic light-emitting diode (OLED). The first transistor T1 controls the driving current flowing in the OLED in accordance with the amount of charge stored in the capacitor Cst.

[0128] The equivalent circuit shown is only one exemplary embodiment, but the exemplary embodiment is not limited thereto. The pixel PX may also include multiple transistors and may include multiple capacitors. An organic light-emitting diode (OLED) may be connected between the power line PL and the first transistor T1.

[0129] Figure 11 A cross-section corresponding to one pixel is shown. In a display device according to some exemplary embodiments, a circuit layer CL, an organic light-emitting diode OLED, and a packaging component TFE are sequentially disposed on a second substrate SUB2.

[0130] In some exemplary embodiments, the circuit layer CL may include a first insulating layer IS1, a second insulating layer IS2, and a third insulating layer IS3. The first insulating layer IS1 and the second insulating layer IS2 may each comprise an inorganic material, and the type of inorganic material is not particularly limited. The third insulating layer IS3 may comprise an organic material, and the type of organic material is not particularly limited. Although not shown, a barrier layer, which may be an inorganic layer, may also be provided on the second substrate SUB2. The first insulating layer IS1, the second insulating layer IS2, and the third insulating layer IS3 may each have a single-layer structure or a multi-layer structure.

[0131] The first transistor T1 includes a semiconductor pattern SP, a control electrode GE, an input electrode SE, and an output electrode DE. The semiconductor pattern SP is disposed on a second substrate SUB2. The semiconductor pattern SP may include crystalline semiconductor material or amorphous silicon, but exemplary embodiments are not limited thereto.

[0132] A first insulating layer IS1 is disposed on a second substrate SUB2. The first insulating layer IS1 overlaps with both the display area DA and the non-display area NDA, and covers the semiconductor pattern SP.

[0133] The control electrode GE is disposed on the first insulating layer IS1. The control electrode GE overlaps with the semiconductor pattern SP. The control electrode GE can be connected to the fabrication scan line GL (see...). Figure 10 It is manufactured using the same photolithography process as the photolithography process.

[0134] A second insulating layer IS2 is disposed on the first insulating layer IS1. The second insulating layer IS2 covers the first insulating layer IS1 and the control electrode GE. The input electrode SE and the output electrode DE are disposed on the second insulating layer IS2. Each of the input electrode SE and the output electrode DE is connected to the semiconductor pattern SP through a plurality of contact holes (e.g., first contact hole CH1 and second contact hole CH2) defined on (or within) the first insulating layer IS1 and the second insulating layer IS2. The first transistor T1 may be configured to have a bottom-gate structure or a dual-gate structure.

[0135] A third insulating layer IS3 covering the first transistor T1 is disposed on the second insulating layer IS2. The third insulating layer IS3 can provide a flat surface.

[0136] An organic light-emitting diode (OLED) and a pixel-defining film (PDL) are disposed on a third insulating layer IS3. The PDL may comprise an organic material. An opening OP in the PDL (or an opening OP in the PDL) exposes at least a portion of the first electrode EL1. The opening OP in the PDL may define the light-emitting region Pxa of the pixel. In some exemplary embodiments, the PDL may be omitted.

[0137] In some exemplary embodiments, the light-emitting region Pxa may overlap with at least one of the first transistor T1 and the second transistor T2. In this case, the opening OP may become wider, and the first electrode EL1 may also become wider.

[0138] The first electrode EL1 is disposed on the third insulating layer IS3. The first electrode EL1 may be formed of a metal alloy or a conductive compound. The first electrode EL1 may be an anode. The first electrode EL1 may be a transmissive electrode, a semi-transmissive reflective electrode, or a reflective electrode.

[0139] The hole transport region (HTR) is disposed on the first electrode EL1. The hole transport region (HTR) may include at least one of a hole injection layer, a hole transport layer, a hole buffer layer, and an electron blocking layer.

[0140] Hole transport region (HTR) may include a single-layer structure having a single layer formed of a single material, a single-layer structure having a single layer formed of multiple different materials, or a multi-layer structure having multiple layers formed of multiple different materials.

[0141] For example, the hole transport region (HTR) may include a single-layer structure having a hole injection layer or a hole transport layer, or a single-layer structure having a single layer formed of a hole injection material and a hole transport material. In some exemplary embodiments, the hole transport region (HTR) may include a single-layer structure having a single layer formed of multiple different materials, or a structure having a hole injection layer / hole transport layer, a hole injection layer / hole transport layer / hole buffer layer, a hole injection layer / hole buffer layer, a hole transport layer / hole buffer layer, or a hole injection layer / hole transport layer / electron blocking layer sequentially stacked on the first electrode EL1, but the exemplary embodiments are not limited thereto.

[0142] As described above, in addition to the hole injection layer and the hole transport layer, the hole transport region HTR according to some exemplary embodiments may also include at least one of a hole buffer layer and an electron blocking layer.

[0143] The emissive layer (EML) is disposed on the hole transport region (HTR). The thickness of the EML can be, for example, approximately... to approximately The light-emitting layer (EML) may include a single-layer structure having a single layer formed of a single material, a single-layer structure having a single layer formed of multiple different materials, or a multi-layer structure having multiple layers formed of multiple different materials.

[0144] The emissive layer (EML) may include a fluorescent or phosphorescent material. In some exemplary embodiments, the EML may emit blue light. The EML may emit light in the wavelength range of 410 nm to 480 nm (or in the wavelength range of 410 nm to 480 nm).

[0145] The electron transport region (ETR) is disposed on the light-emitting layer (EML). The ETR may include, but is not limited to, at least one of a hole blocking layer, an electron transport layer, and an electron injection layer.

[0146] The electron transport region (ETR) may include a single-layer structure having a single layer formed of a single material, a single-layer structure having a single layer formed of multiple different materials, or a multi-layer structure having multiple layers formed of multiple different materials. For example, the electron transport region (ETR) may include a single-layer structure having an electron injection layer or an electron transport layer, or a single-layer structure having a single layer formed of an electron injection material and an electron transport material. In some exemplary embodiments, the electron transport region (ETR) may include a single-layer structure having a single layer formed of multiple different materials, or a structure having an electron transport layer / electron injection layer or a hole blocking layer / electron transport layer / electron injection layer sequentially stacked from the light-emitting layer (EML), but the exemplary embodiments are not limited thereto.

[0147] The second electrode EL2 is disposed on the electron transport region ETR. The second electrode EL2 is conductive. The second electrode EL2 can be formed of a metal alloy or a conductive compound. The second electrode EL2 can be a cathode. The second electrode EL2 can be a transmission electrode, a semi-transmissive reflective electrode, or a reflective electrode.

[0148] Although not shown, the second electrode EL2 can be connected to the auxiliary electrode. When the second electrode EL2 is connected to the auxiliary electrode, the resistance of the second electrode EL2 can be reduced.

[0149] A packaging component TFE can be disposed on the second electrode EL2. The packaging component TFE is commonly disposed in pixel regions Pxa-B, Pxa-G, and Pxa-R (see [link to documentation]). Figure 3 The encapsulation member TFE can directly cover the second electrode EL2. The encapsulation member TFE can include at least one inorganic film IL and can also include an organic film OL, or can have a structure in which the inorganic film IL and the organic film OL are alternately repeated. In some exemplary embodiments, the encapsulation member TFE can include an inorganic film IL at the outermost periphery.

[0150] In the following description, a method for manufacturing a display device according to some exemplary embodiments will be described with reference to the accompanying drawings.

[0151] Figures 12A to 12D These are cross-sectional views of display devices at various manufacturing stages according to some exemplary embodiments. Figure 13 This is a cross-sectional view of a display device in the manufacturing stage, according to some exemplary embodiments. Figures 12A to 12DThe steps of preparing the upper display substrate in a method for manufacturing a display device according to some exemplary embodiments are shown in sequence. Figure 13 The image shows a step of joining an upper display substrate and a lower display substrate in a method of manufacturing a display device according to some exemplary embodiments.

[0152] A method of manufacturing a display device according to some exemplary embodiments includes preparing an upper display substrate, preparing a lower display substrate, and joining the upper and lower display substrates together.

[0153] refer to Figure 12A Preparing the upper display substrate includes preparing a base substrate SUB1 (also referred to as a first substrate SUB1). The method may further include forming a color filter layer on the base substrate SUB1. The color filter layer may include a first color filter portion B-CFP, a second color filter portion G-CFP, and a third color filter portion R-CFP, as well as a light-blocking member BM. Each of the first color filter portion B-CFP, the second color filter portion G-CFP, and the third color filter portion R-CFP may be formed in conjunction with a first pixel region Pxa-B, a second pixel region Pxa-G, and a third pixel region Pxa-R (see [reference]). Figure 3 The color filter layer consists of overlapping sections. Each of the first color filter section B-CFP, the second color filter section G-CFP, and the third color filter section R-CFP can be formed by a solution process (e.g., spin coating, slot coating, inkjet printing, and photoresist processing).

[0154] refer to Figures 12A to 12C A light-blocking pattern BP can be formed on the color filter layer. A first capping layer CAP1 can be formed between the light-blocking pattern BP and the color filter layer. The light-blocking pattern BP is formed in the peripheral region NPxa (see...). Figure 3 In the context of ), the region in which the transmission section TP, the first light conversion section CCP1, and the second light conversion section CCP2 are to be formed can be defined.

[0155] A transmissive portion TP, a first light conversion portion CCP1, and a second light conversion portion CCP2 can be formed in the area defined by the light-blocking pattern BP. Each of the transmissive portion TP, the first light conversion portion CCP1, and the second light conversion portion CCP2 can be formed by a photoresist process. The transmissive portion TP can be formed in conjunction with the first pixel area Pxa-B (see...). Figure 3 Correspondingly, the first light conversion unit CCP1 can be formed to correspond with the second pixel region Pxa-G (see...). Figure 3 Corresponding to, and the second light conversion unit CCP2 can be formed to correspond with the third pixel region Pxa-R (see) Figure 3 )correspond.

[0156] refer to Figure 12DA second light control layer CCL2 can be formed on the transmissive portion TP, the first light conversion portion CCP1, and the second light conversion portion CCP2. The second light control layer CCL2 can be formed by full coating to completely overlap with the transmissive portion TP, the first light conversion portion CCP1, and the second light conversion portion CCP2 in a planar view. The second light control layer CCL2 can be formed by at least one of a photoresist process and a slot coating process. Because the second light control layer CCL2 is formed by full coating, process steps are skipped, thereby simplifying the process and reducing costs.

[0157] exist Figure 12D In the diagram, the second light control layer CCL2 is shown to be completely formed on the transmissive portion TP, the first light conversion portion CCP1, and the second light conversion portion CCP2 in a planar view; however, the exemplary embodiment is not limited to this. The second light control layer CCL2 can be formed by patterning. For example, the second light control layer CCL2 can completely overlap with the first light conversion portion CCP1 in a planar view, and can also be patterned so that it does not overlap with the transmissive portion TP and the second light conversion portion CCP2.

[0158] A second capping layer CAP2 can be formed on the second light control layer CCL2. The first capping layer CAP1 and the second capping layer CAP2 can be disposed on the upper and lower surfaces of the first light control layer CCL1 and the second light control layer CCL2, respectively, and protect the first light control layer CCL1 and the second light control layer CCL2. The first capping layer CAP1 and the second capping layer CAP2 can be omitted.

[0159] refer to Figure 13 A method of manufacturing a display device according to some exemplary embodiments includes connecting an upper display substrate and a lower display substrate. The connection of the upper and lower display substrates can be performed such that the light-emitting regions of pixels defined by openings in pixel-defining films (PDLs) correspond to first pixel regions Pxa-B, second pixel regions Pxa-G, and third pixel regions Pxa-R.

[0160] According to various exemplary embodiments, the display device may include a second light control layer, at least a portion of which overlaps with a first light conversion portion of a first light control layer, thereby increasing the efficiency of converting first light into second light. Therefore, the overall light efficiency of the display device can be increased.

[0161] While certain exemplary embodiments and examples have been described herein, other embodiments and modifications will be apparent from that description. Therefore, the inventive concept is not limited to such embodiments, but rather to the broader scope of the appended claims and various obvious modifications and equivalent arrangements as will be apparent to those skilled in the art.

Claims

1. A display device, including: The substrate includes a pixel region and a peripheral region adjacent to the pixel region; A plurality of display elements are disposed on the substrate and overlap the pixel region in a plan view, the plurality of display elements being configured to generate a first light; A first light control layer is disposed on the plurality of display elements, and the first light control layer includes: The transmissive section is configured to transmit the first light; A first light conversion unit is configured to convert the first light into a second light; and A second light conversion unit is configured to convert the first light into a third light; and a second light control layer includes: A first sub-light conversion unit is configured to convert the first light into the second light, wherein the first light conversion unit overlaps with the first sub-light conversion unit in the plan view; and The second sub-light conversion unit is configured to transmit the first light, and each of the transmission unit and the second light conversion unit overlaps with the second sub-light conversion unit in the plan view; The first light conversion unit includes a first plurality of quantum dots, and the first sub-light conversion unit includes a second plurality of quantum dots. The first plurality of quantum dots and the second plurality of quantum dots have the same material and the same size.

2. The display device as claimed in claim 1, wherein, The second light control layer is in direct contact with at least a portion of the first light control layer.

3. The display device as claimed in claim 2, wherein, The second light control layer is in direct contact with the first light conversion unit.

4. The display device as claimed in claim 2, wherein, The second light control layer is disposed between the first light control layer and the plurality of display elements.

5. The display device as claimed in claim 2, further comprising: A color filter layer is disposed on the first light control layer.

6. The display device as claimed in claim 5, wherein, The color filter layer includes: A first color filter portion overlaps with the transmissive portion in the plan view, and the first color filter portion is configured to transmit the first light; A second color filter section overlaps with the first light conversion section in the plan view, and the second color filter section is configured to transmit the second light; and The third color filter section overlaps with the second light conversion section in the plan view, and the third color filter section is configured to transmit the third light.

7. The display device as claimed in claim 5, wherein, The second light control layer is disposed between the color filter layer and the first light control layer.

8. The display device as claimed in claim 1, wherein, The second light control layer is disposed on the first light control layer.

9. The display device as claimed in claim 1, wherein, The second light control layer completely overlaps with the first light control layer in the plan view.

10. The display device as claimed in claim 1, wherein, The first light is light in the wavelength region of 410nm to 480nm; The second light is light in the wavelength region of 500nm to 570nm; and The third light is light in the wavelength region of 625nm to 675nm.

11. The display device of claim 1, further comprising: An encapsulation component is disposed on the plurality of display elements and includes an inorganic film located at the outermost periphery of the encapsulation component; as well as A filler layer is disposed between the first light control layer and the encapsulation component.

12. The display device as claimed in claim 1, wherein, The first light control layer further includes a light-blocking pattern overlapping the peripheral region in the planar view; and The light-blocking pattern is disposed between the transmissive portion, the first light conversion portion, and the second light conversion portion.

13. The display device as claimed in claim 12, wherein, In the cross-sectional view, the height of the first light conversion section is less than or equal to the height of the light blocking pattern; and In the cross-sectional view, the sum of the height of the first light conversion section and the height of the second light control layer is greater than or equal to the height of the light blocking pattern.

14. The display device as claimed in claim 1, wherein, The refractive index of the second light control layer is equal to that of the first light control layer.

15. A display device, including: The substrate includes a pixel region and a peripheral region adjacent to the pixel region; A display element is disposed on the substrate and overlaps with the pixel region in a plan view, the display element being configured to generate a first light; A first light control layer is disposed on the display element and overlaps with the pixel region in the planar view, the first light control layer comprising: The transmissive section is configured to transmit the first light; A first light conversion unit is configured to convert the first light into a second light; and A second light conversion unit is configured to convert the first light into a third light; and a second light control layer includes: A first sub-light conversion unit, overlapping with the first light conversion unit in the plan view, and configured to convert the first light into the second light; and The second sub-light conversion unit overlaps with each of the transmission unit and the second light conversion unit in the plan view, and is configured to transmit the first light; The first light conversion unit includes a first plurality of quantum dots, and the first sub-light conversion unit includes a second plurality of quantum dots. The first plurality of quantum dots and the second plurality of quantum dots have the same material and the same size.

16. A method for manufacturing a display device, the method comprising: Prepare an upper display substrate, the upper display substrate including a first pixel region, a second pixel region and a third pixel region and a peripheral region adjacent to the first pixel region, the second pixel region and the third pixel region; Prepare a lower display substrate, the lower display substrate including a plurality of display elements configured to generate a first light; as well as The upper display substrate and the lower display substrate are connected to each other. The preparation of the upper display substrate includes: Prepare the substrate; A first light control layer is disposed on the surface of the substrate, the first light control layer comprising: A transmissive portion, corresponding to the first pixel region and configured to transmit the first light; A first light conversion unit, corresponding to the second pixel region and configured to convert the first light into second light; and A second light conversion unit, corresponding to the third pixel region and configured to convert the first light into the third light; and A second light control layer is disposed on the first light control layer, the second light control layer comprising: A first sub-light conversion unit is configured to convert the first light into the second light, wherein the first light conversion unit overlaps with the first sub-light conversion unit in the plan view; and The second sub-light conversion unit is configured to transmit the first light, and each of the transmission unit and the second light conversion unit overlaps with the second sub-light conversion unit in the plan view; The first light conversion unit includes a first plurality of quantum dots, and the first sub-light conversion unit includes a second plurality of quantum dots. The first plurality of quantum dots and the second plurality of quantum dots have the same material and the same size.

17. The method of claim 16, wherein, The second light control layer is formed to completely overlap with the first pixel region, the second pixel region, and the third pixel region.

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