Display device

Abstract

The invention relates to a display device. The display device includes: a first substrate; a transistor disposed on the first substrate; a light emitting element electrically connected to the transistor; a bank disposed on the light emitting element, wherein an opening is defined by the bank; and a color conversion layer disposed within the aperture, where the color conversion layer includes quantum dots, where the color conversion layer includes: a first sub-region adjacent to the bank and including a first scatterer; and a second sub-region overlapping a center of the color conversion layer in plan view and including a second scatterer, in which one of the first scatterer and the second scatterer has a rutile crystal structure and the other of the first scatterer and the second scatterer has an anatase crystal structure.

Description

Technical Field

[0001] The present disclosure relates to a display device. Background Art

[0002] A light-emitting element is a device that forms excitons by recombining holes supplied from an anode and electrons supplied from a cathode within a light-emitting layer formed between the anode and the cathode, and emits light when the excitons fall from an excited state to a ground state.

[0003] The light-emitting element has various desirable characteristics, such as a wide viewing angle, a fast response speed, a thin thickness, and low power consumption. Therefore, such a light-emitting element is widely applied to various electrical and electronic devices, such as televisions, monitors, and mobile phones.

[0004] Recently, a display device including a color conversion layer has been proposed to achieve an efficient display device.

[0005] The color conversion layer can convert the color of incident light into a different color. Summary of the Invention

[0006] Embodiments are directed to providing a display device having improved front light efficiency (also referred to as "front emission efficiency").

[0007] A display device according to an embodiment includes: a first substrate; a transistor disposed on the first substrate; a light-emitting element electrically connected to the transistor; a bank disposed on the light-emitting element, wherein an opening is defined by the bank; and a color conversion layer disposed within the opening, wherein the color conversion layer includes quantum dots, wherein the color conversion layer includes: a first sub-region adjacent to the bank and including a first scatterer; and a second sub-region overlapping the center of the color conversion layer in a plan view and including a second scatterer, wherein one of the first scatterer and the second scatterer has a rutile crystal structure, and the other of the first scatterer and the second scatterer has anatase crystal structure.

[0008] In an embodiment, the first scatterer may have a rutile crystal structure, and the second scatterer may have anatase crystal structure.

[0009] In an embodiment, the first sub-region may not include quantum dots, and the second sub-region may include quantum dots.

[0010] In an embodiment, the display device may further include a transmissive layer disposed within another opening defined by the bank, and the transmissive layer may include the first scatterer.

[0011] In an embodiment, the color conversion layer may be a second color conversion layer, the display device may further include a first color conversion layer disposed within yet another opening defined by the bank, and the first color conversion layer may include the first scatterer.

[0012] In an embodiment, in a plan view, the second sub-region may be disposed between the first sub-region and the dam.

[0013] In an embodiment, the light-emitting element may emit light that is a mixture of green light and blue light.

[0014] In an embodiment, each of the first scatterer and the second scatterer may have a diameter in the range of about 20 nanometers (nm) to about 500 nm.

[0015] In an embodiment, each of the first sub-region and the second sub-region may include quantum dots.

[0016] In an embodiment, the transmissive layer may include a third sub-region including the first scatterer and a fourth sub-region including the second scatterer.

[0017] In an embodiment, the display device may further include: a encapsulation layer disposed on the light-emitting element; a second substrate disposed opposite to the first substrate; a color filter disposed between the second substrate and the encapsulation layer; and a filling layer disposed between the color filter and the encapsulation layer, and the dam and the color conversion layer may be disposed between the color filter and the filling layer.

[0018] In an embodiment, the display device may further include: a encapsulation layer disposed on the light-emitting element; a second substrate disposed opposite to the first substrate; a color filter disposed between the second substrate and the encapsulation layer; and a filling layer disposed between the color filter and the encapsulation layer, and the dam and the color conversion layer may be disposed between the encapsulation layer and the filling layer.

[0019] A display device according to an embodiment includes: a first substrate; a transistor disposed on the first substrate; a light-emitting element electrically connected to the transistor; a dam disposed on the light-emitting element, wherein an opening is defined by the dam; and a color conversion layer disposed in the opening, wherein the color conversion layer includes quantum dots, wherein the color conversion layer includes: a first sub-region adjacent to the dam and including the first scatterer; and a second sub-region overlapping the center of the color conversion layer in a plan view and including the second scatterer, wherein the first scatterer and the second scatterer are composed of the same type of atoms and have different crystal structures from each other.

[0020] In an embodiment, the first scatterer and the second scatterer may be TiO2.

[0021] In an embodiment, one of the first scatterer and the second scatterer may have a rutile crystal structure, and the other of the first scatterer and the second scatterer may have anatase crystal structure.

[0022] In an embodiment, the first scatterer may have a rutile crystal structure, and the second scatterer may have anatase crystal structure.

[0023] In an embodiment, the first sub-region may not include quantum dots, and the second sub-region may include quantum dots.

[0024] In an embodiment, the display device may further include a transmissive layer disposed in another opening defined by a bank, and the transmissive layer may include a first scatterer.

[0025] In an embodiment, the color conversion layer may be a second color conversion layer, the display device may further include a first color conversion layer disposed in yet another opening defined by a bank, and the first color conversion layer may include a first scatterer.

[0026] In an embodiment, the light-emitting element may emit light that is a mixture of green light and blue light.

[0027] According to an embodiment, the display device may have improved front light efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 FIG. is a schematic exploded perspective view of a display device according to an embodiment.

[0029] Figure 2 FIG. is a schematic cross-sectional view of a display panel according to an embodiment.

[0030] Figure 3 FIG. is a cross-sectional view of a display panel according to an embodiment.

[0031] Figure 4 FIG. is a diagram showing a crystal form of a scatterer according to an embodiment.

[0032] Figure 5 FIG. is a diagram showing a form of light emitted from a second color conversion layer according to an embodiment.

[0033] Figure 6 and Figure 7 FIG. is a diagram of a method for manufacturing a second color conversion layer according to an embodiment.

[0034] Figure 8 、 Figure 9 and Figure 10 FIG. is a cross-sectional view of a display panel according to other embodiments.

[0035] Figure 11 FIG. is an image of a second color conversion layer formed by an inkjet process according to an embodiment. DETAILED DESCRIPTION

[0036] The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which various embodiments are shown. However, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0037] To clearly explain the present invention, parts not relevant to the description are omitted, and throughout the specification, the same or similar components are given the same reference numerals.

[0038] In addition, the dimensions (e.g., thickness) of each component shown in the drawings are arbitrarily shown for convenience of explanation, and thus the present invention is not necessarily limited to what is shown.

[0039] In the drawings, the thickness is enlarged to clearly show each layer and region.

[0040] And in the drawings, for convenience of explanation, the thicknesses of some layers and regions are enlarged.

[0041] In addition, when an element (such as a layer, film, region, or plate) is referred to as being "on" or "above" another element (such as a layer, film, region, or plate), this includes not only the case where the element (such as a layer, film, region, or plate) is "directly on" the other element (such as a layer, film, region, or plate), but also the case where other elements (such as layers, films, regions, or plates) are between the two.

[0042] In contrast, when an element (such as a layer, film, region, or plate) is referred to as being "directly on" another element (such as a layer, film, region, or plate), there is no intervening element.

[0043] In addition, "on" or "above" a reference member means being disposed above or below the reference member, and does not necessarily mean being disposed "above" or "on" it in the direction opposite to gravity.

[0044] It will be understood that although the terms "first", "second", "third", etc. may be used herein to describe various elements, components, regions, layers, and / or parts, these elements, components, regions, layers, and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer, and / or part from another element, component, region, layer, and / or part. Thus, without departing from the teachings herein, the first element, component, region, layer, or part discussed below may be referred to as the second element, component, region, layer, or part.

[0045] The terms used herein are for the purpose of describing particular embodiments only and are not intended to be limiting. As used herein, "a", "an", "the", and "at least one" do not denote a limitation of quantity and are intended to include both singular and plural references, unless the context clearly indicates otherwise. Thus, a reference to "an element" followed by a reference to "the" element includes one or more elements. For example, "an element" has the same meaning as "at least one element", unless the context clearly indicates otherwise. "At least one" is not to be construed as limited to "a" or "an". "Or" means "and / or". As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. It will be further understood that when the terms "comprises" and / or "comprising" or "includes" and / or "including" are used in this specification, it is indicated that there are the recited features, regions, integers, steps, operations, elements, components, and / or groups thereof, but does not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and / or groups thereof.

[0046] In addition, relative terms such as "lower" or "bottom" and "upper" or "top" may be used herein to describe the relationship of one element to another as illustrated in the figures. It will be understood that the relative terms are intended to cover different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in one figure is turned over, an element described as on the "lower" side of another element will then be oriented on the "upper" side of the other element. Thus, depending on the specific orientation of the figure, the term "lower" can cover both the "lower" and "upper" orientations. Similarly, if the device in one figure is turned over, an element described as "beneath" or "under" another element will then be oriented "above" the other element. Thus, the terms "beneath" or "under" can cover both the above and below orientations.

[0047] In addition, throughout the specification, when reference is made to "in a plane" or "in a plan view", this means when the target portion is observed from above, and when reference is made to "in a cross section", it means when the cross section of the target portion cut vertically is observed from the side.

[0048] As used herein, "about" or "approximately" includes the recited value and means within an acceptable deviation range of the specific value as determined by one of ordinary skill in the art in view of the measurements discussed and the errors associated with the measurement of a particular quantity (e.g., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations, or within ±30%, ±20%, ±10%, or ±5% of the recited value.

[0049] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and this disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined in the specification.

[0050] Embodiments are described herein with reference to cross-sectional views that are schematic illustrations of ideal embodiments. As such, variations in the shape of the illustrations due to, for example, manufacturing techniques and / or tolerances are to be expected. Accordingly, the embodiments described herein should not be construed as limited to the particular shapes of regions illustrated herein, but should include deviations in shape, for example, due to manufacturing. For example, regions illustrated or described as flat will generally have rough and / or non-linear features. Moreover, illustrated sharp corners may be rounded. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the exact shape of a region and are not intended to limit the scope of the claims.

[0051] Hereinafter, reference will be made to Figure 1 describe a display device according to an embodiment.

[0052] Figure 1 is a schematic exploded perspective view of a display device according to an embodiment.

[0053] Reference Figure 1 , a display device 1000 according to an embodiment may include a display panel DP and a housing HM.

[0054] One side of the display panel DP on which an image is displayed is parallel to one side defined by a first direction DR1 and a second direction DR2.

[0055] A third direction DR3 indicates the normal direction of the side on which the image is displayed, that is, the thickness direction of the display panel DP.

[0056] The front surface (or upper surface) and the back surface (or lower surface) of each member are separated by the third direction DR3 or are opposite to each other in the third direction DR3.

[0057] However, the directions indicated by the first to third directions DR1, DR2, and DR3 are relative concepts and can be converted into other directions.

[0058] The display panel DP may be a flat rigid display panel, but is not limited thereto, and may be a flexible display panel.

[0059] In an embodiment, the display panel DP may be an organic light emitting display panel.

[0060] However, the type of the display panel DP is not limited thereto, and it may be one of various other types of display panels.

[0061] In an embodiment, for example, the display panel DP may be a liquid crystal display panel, an electrophoretic display panel, an electro-wetting display panel, or the like.

[0062] In addition, the display panel DP may be a next-generation display panel, such as a micro light-emitting diode (LED) display panel, a quantum dot LED display panel, or a quantum dot organic light-emitting diode display panel.

[0063] The micro LED display panel may be defined as a panel including LEDs having a size (e.g., width or length) in the range of about 10 micrometers to about 100 micrometers to form each pixel.

[0064] Such a micro LED display panel may be desirable because the micro LED display panel uses inorganic materials, does not include a backlight, has a fast response speed, can achieve high brightness with low power through the micro LED display panel, and does not break when bent.

[0065] The quantum dot LED display panel may be formed by attaching a film including quantum dots or by using a material including quantum dots.

[0066] Quantum dots are particles including or made of inorganic materials (such as indium and cadmium), emitting light by themselves, and having a diameter of several nanometers or less.

[0067] By controlling the particle size of the quantum dots, light of a desired color can be displayed.

[0068] The quantum dot organic light-emitting diode display panel uses a blue organic light-emitting diode as a light source and displays colors by attaching a film containing red quantum dots and green quantum dots or depositing a material containing red quantum dots and green quantum dots on the blue organic light-emitting diode.

[0069] The display panel DP according to the embodiment may be any one of various other types of display panels.

[0070] In an embodiment, as Figure 1 shown, the display panel DP includes a display area DA where an image is displayed and a non-display area PA adjacent to the display area DA.

[0071] The non-display area PA is an area where no image is displayed, that is, an area where no pixels are provided.

[0072] In an embodiment, for example, the display area DA may have a square shape, and the non-display area PA may have a shape surrounding the display area DA.

[0073] However, the shapes of the display area DA and the non-display area PA may be variously modified and are not limited thereto.

[0074] The housing HM provides a predetermined internal space.

[0075] The display panel DP is installed inside the housing HM or disposed in the predetermined internal space of the housing HM.

[0076] Inside the housing HM, various electronic components such as a power supply unit, a storage device, and an audio input / output module may be installed in addition to the display panel DP.

[0077] Hereinafter, reference will be made to Figure 2 describe the display area of the display panel according to the embodiment.

[0078] Figure 2 is a schematic cross-sectional view of a display panel according to an embodiment.

[0079] Referring to Figure 2 , a plurality of pixels PA1, PA2, and PA3 may be provided on the substrate SUB corresponding to Figure 1 the display area DA.

[0080] Each pixel PA1, PA2, or PA3 may include a plurality of transistors and a light-emitting element connected thereto.

[0081] In this specification, the shapes and arrangements of the plurality of pixels PA1, PA2, and PA3 may be variously modified.

[0082] The encapsulation layer ENC may be provided on the plurality of pixels PA1, PA2, and PA3.

[0083] The display area DA may be protected by the encapsulation layer ENC (see Figure 1 ) from the influence of external air or moisture.

[0084] The encapsulation layer ENC may be provided integrally or jointly so as to overlap the entire surface of the display area DA (see Figure 1 ) and may be partially disposed on the non-display area PA (see Figure 1 ).

[0085] The first color conversion unit CC1, the second color conversion unit CC2, and the transmissive unit CC3 may be provided on the encapsulation layer ENC.

[0086] The first color conversion unit CC1 overlaps with the first pixel PA1 in the third direction DR3 (i.e., the thickness direction of the substrate SUB), the second color conversion unit CC2 overlaps with the second pixel PA2 in the third direction DR3, and the transmissive unit CC3 overlaps with the third pixel PA3 in the third direction DR3.

[0087] The light emitted from the first pixel PA1 can pass through the first color conversion unit CC1 to provide red light LR.

[0088] The light emitted from the second pixel PA2 can pass through the second color conversion unit CC2 to provide green light LG.

[0089] The light emitted from the third pixel PA3 can pass through the transmissive unit CC3 to provide blue light LB.

[0090] Hereinafter, reference will be made to Figures 3 to 7 to describe in more detail the structure of the display panel according to the embodiment.

[0091] Figure 3 is a cross-sectional view of a display panel according to an embodiment, Figure 4 is a view showing the crystal form of the scatterer according to an embodiment, Figure 5 is a view showing the form of the light emitted from the second color conversion layer according to an embodiment, and Figure 6 and Figure 7 is a diagram showing a method for manufacturing the second color conversion layer according to an embodiment.

[0092] First, referring to Figure 3 , the display area DA (see Figure 1 ) according to the embodiment includes a red light emission area RLA, a green light emission area GLA, and a blue light emission area BLA.

[0093] A non-emission area NLA1 may be provided (or defined) between the red light emission area RLA, the green light emission area GLA, and the blue light emission area BLA.

[0094] Each light emission area may correspond to a pixel.

[0095] In an embodiment, for example, the blue light emission area BLA, the red light emission area RLA, and the green light emission area GLA may correspond to a blue pixel, a red pixel, and a green pixel, respectively.

[0096] Hereinafter, the cross-sectional structure of the display area DA (see Figure 1 ) will be described in detail.

[0097] The display unit DC according to the embodiment includes a first substrate SUB1.

[0098] The first substrate SUB1 may include a flexible material (such as plastic) that can be bent, folded, or rolled up.

[0099] The buffer layer BF may be disposed on the first substrate SUB1.

[0100] In another embodiment, the buffer layer BF may be omitted.

[0101] The buffer layer BF may include silicon nitride (SiN x ), silicon oxide (SiO x ), or silicon oxynitride (SiO x N y ).

[0102] The buffer layer BF is disposed between the first substrate SUB1 and the semiconductor layer ACT, and improves the characteristics of the polysilicon by blocking impurities from the first substrate SUB1 during the crystallization process of forming polysilicon. The buffer layer BF may provide a flat surface on the first substrate SUB1, so that the stress of the semiconductor layer ACT provided or formed on the buffer layer BF can be reduced.

[0103] The semiconductor layer ACT is disposed on the buffer layer BF.

[0104] The semiconductor layer ACT may include polysilicon or an oxide semiconductor, or be made of polysilicon or an oxide semiconductor.

[0105] The semiconductor layer ACT includes a channel region C, a source region S, and a drain region D.

[0106] The source region S and the drain region D are respectively arranged on two opposite sides of the channel region C.

[0107] The channel region C is an intrinsic semiconductor without doped impurities, and the source region S and the drain region D are impurity semiconductors doped with conductive impurities.

[0108] In an embodiment, the semiconductor layer ACT may include an oxide semiconductor or be made of an oxide semiconductor. In this embodiment, a separate protective layer (not shown) may be added to protect the oxide semiconductor material vulnerable to the external environment (such as high temperature).

[0109] The gate insulating layer GI is disposed on the semiconductor layer ACT.

[0110] The gate insulating layer GI may have a single-layer structure or a multi-layer structure, and each layer thereof includes at least one selected from silicon nitride (SiN x ), silicon oxide (SiO x ), and silicon oxynitride (SiO x N y ).

[0111] The gate electrode GE is disposed on the gate insulating layer GI. The gate electrode GE includes at least one selected from copper (Cu), copper alloy, aluminum (Al), aluminum alloy, molybdenum (Mo), and molybdenum alloy, and the gate electrode GE may have a multilayer structure in which metal layers are stacked.

[0112] The interlayer insulating layer IL1 is disposed on the gate electrode GE and the gate insulating layer GI.

[0113] The interlayer insulating layer IL1 may include silicon nitride (SiN x ), silicon oxide (SiO x ), or silicon oxynitride (SiO x N y ).

[0114] Openings exposing the source region S and the drain region D are defined or formed in the interlayer insulating layer IL1.

[0115] The source electrode SE and the drain electrode DE are disposed on the interlayer insulating layer IL1.

[0116] The source electrode SE and the drain electrode DE are respectively connected to the source region S and the drain region D of the semiconductor layer ACT through the openings defined or formed in the interlayer insulating layer IL1.

[0117] The protective layer IL2 is disposed on the interlayer insulating layer IL1, the source electrode SE, and the drain electrode DE.

[0118] The protective layer IL2 covers the interlayer insulating layer IL1, the source electrode SE, and the drain electrode DE and planarizes the interlayer insulating layer IL1, the source electrode SE, and the drain electrode DE (or provides a flat surface on the interlayer insulating layer IL1, the source electrode SE, and the drain electrode DE), so that the first electrode E1 can be formed on the protective layer IL2 without steps.

[0119] The protective layer IL2 may include an organic material (such as a polyacrylate resin or a polyimide resin) or a laminate of an organic material and an inorganic material, or be made of an organic material (such as a polyacrylate resin or a polyimide resin) or a laminate of an organic material and an inorganic material.

[0120] The first electrode E1 is disposed on the protective layer IL2.

[0121] The first electrode E1 is connected to the drain electrode DE through the opening defined or formed in the protective layer IL2.

[0122] The driving transistor including the gate electrode GE, the semiconductor layer ACT, the source electrode SE, and the drain electrode DE is connected to the first electrode E1 to supply a driving current to the light-emitting element ED.

[0123] In addition to Figure 3 the driving transistor shown inFigure 1 ) may further include a switching transistor (not shown) connected to a data line and transmitting a data voltage in response to a scan signal, and a switching transistor (not shown) connected to the driving transistor and driven in response to a scan signal, and the display device 1000 (see Figure 1 ) may further include a compensating transistor (not shown) for compensating the threshold voltage of the transistor.

[0124] The pixel defining layer PDL is disposed on the protective layer IL2 and the first electrode E1, and the pixel defining layer PDL may define a pixel opening that exposes a portion of the first electrode E1 corresponding to the light emitting region.

[0125] The pixel defining layer PDL may include an organic material (such as polyacrylate resin or polyimide resin) or an inorganic material such as silica.

[0126] The pixel opening may have a planar shape substantially similar to the planar shape of the first electrode E1, and may have a rhombus or an octagon similar to a rhombus shape in a plan view (or when viewed in the thickness direction of the first substrate SUB1), but is not limited thereto, and may have any other shape, such as other polygonal shapes (e.g., square).

[0127] The light emitting layer EML is disposed on a portion of the first electrode E1 that overlaps or is exposed through the pixel opening.

[0128] The light emitting layer EML may include a low molecular organic material or a high molecular organic material (such as poly(3,4-ethylenedioxythiophene) (PEDOT)), or be made of a low molecular organic material or a high molecular organic material (such as poly(3,4-ethylenedioxythiophene) (PEDOT)).

[0129] In addition, the light emitting layer EML includes a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer, and the light emitting layer EML may have a multi-layer structure including one or more additional layers in addition to the above layers.

[0130] In an embodiment, the light emitting layer EML may be mostly disposed within the pixel opening, and may also be disposed on the side surface of the pixel defining layer PDL or on the pixel defining layer PDL.

[0131] The second electrode E2 is disposed on the light emitting layer EML.

[0132] The second electrode E2 may be disposed across multiple pixels, and may receive a common voltage through a common voltage transmitter (not shown) in a non-display area.

[0133] The first electrode E1, the light emitting layer EML, and the second electrode E2 may form or jointly define a light emitting element ED.

[0134] In an embodiment, for example, the first electrode E1 may be an anode serving as a hole injection electrode, and the second electrode E2 may be a cathode serving as an electron injection electrode.

[0135] However, the embodiment is not necessarily limited thereto, and alternatively, depending on the driving method of the display device 1000 (see Figure 1 ), the first electrode E1 may be a cathode and the second electrode E2 may be an anode.

[0136] Holes and electrons are respectively injected from the first electrode E1 and the second electrode E2 into the light-emitting layer EML, and light emission occurs when excitons formed by the recombination of the injected holes and electrons fall from the excited state to the ground state.

[0137] The light-emitting element ED according to the embodiment may include a plurality of light-emitting units.

[0138] Each light-emitting unit may include a light-emitting layer.

[0139] The light-emitting element ED may be a tandem-structured light-emitting element.

[0140] The plurality of light-emitting layers may emit light of the same color as each other or light of different colors from each other.

[0141] In an embodiment, for example, the light-emitting element ED may emit light mixed with green light and blue light, or may emit blue light.

[0142] The encapsulation layer ENC is disposed on the second electrode E2.

[0143] The encapsulation layer ENC may seal the display layer by covering not only the top surface of the display layer including the light-emitting element ED but also the side surface of the display layer including the light-emitting element ED.

[0144] Since the light-emitting element ED is vulnerable to moisture and oxygen, the encapsulation layer ENC seals the display layer and blocks the inflow of external moisture and oxygen.

[0145] The encapsulation layer ENC may include a plurality of layers and may be formed or defined by a composite layer including both an inorganic layer and an organic layer (for example, including a first inorganic layer EIL1, an organic layer EOL, and a second inorganic layer EIL2).

[0146] The color conversion unit CC is disposed on the encapsulation layer ENC.

[0147] The color conversion unit CC includes a second substrate SUB2 that overlaps or is disposed opposite to the first substrate SUB1.

[0148] The second substrate SUB2 may include a flexible material (such as plastic) that can be easily bent, folded, or rolled up.

[0149] The color conversion unit CC includes a first color filter CF1, a second color filter CF2, and a third color filter CF3 disposed between the second substrate SUB2 and the display unit DC.

[0150] The first color filter CF1 may overlap with the transmissive layer TL.

[0151] The first color filter CF1 may transmit blue light that has passed through the transmissive layer TL and is incident thereon (i.e., blue light incident thereon after passing through the transmissive layer TL), and absorb light of the remaining wavelengths, thereby increasing the purity of the blue light emitted to the outside of the display device.

[0152] The second color filter CF2 may overlap with the first color conversion layer CCL1.

[0153] The second color filter CF2 may transmit red light that has passed through the first color conversion layer CCL1 and is incident thereon, and absorb light of the remaining wavelengths, thereby increasing the purity of the red light emitted to the outside of the display device.

[0154] The third color filter CF3 may overlap with the second color conversion layer CCL2.

[0155] The third color filter CF3 may transmit green light that has passed through the second color conversion layer CCL2 and is incident thereon, and absorb light of the remaining wavelengths, thereby increasing the purity of the green light emitted to the outside of the display device.

[0156] In a plan view, at least two selected from the third color filter CF3, the second color filter CF2, and the first color filter CF1 may overlap with each other in the non-emission region NLA1 and serve as a light-blocking layer.

[0157] In a plan view, the non-emission region NLA1 may overlap with the pixel defining layer PDL of the display unit DC and the bank BK1 of the color conversion unit CC.

[0158] A third insulating layer IL5 may be disposed between the color filters CF1, CF2, and CF3 and the display unit DC.

[0159] In an embodiment, for example, the third insulating layer IL5 may include an organic material or an inorganic material (such as silicon nitride (SiN x ), silicon oxide (SiO x ), or silicon oxynitride (SiO x N y ))).

[0160] A second insulating layer IL4 may be located between the third insulating layer IL5 and the display unit DC.

[0161] The second insulating layer IL4 may include, for example, silicon nitride (SiN x ), silicon oxide (SiOx ) or silicon oxynitride (SiO x N y ).

[0162] In another embodiment, the second insulating layer IL4 may be omitted.

[0163] The color conversion unit CC may include a bank BK1 disposed between the second insulating layer IL4 and the display unit DC.

[0164] The bank BK1 may define a first opening OP1, a second opening OP2, and a third opening OP3, and in a plan view, each of the first opening OP1, the second opening OP2, and the third opening OP3 overlaps with a pixel opening.

[0165] The sizes of the first opening OP1, the second opening OP2, and the third opening OP3 may be different from each other or the same as each other.

[0166] In a plan view, the first color conversion layer CCL1 may be disposed within the first opening OP1.

[0167] The first color conversion layer CCL1 may convert the color of the supplied light into red.

[0168] The first color conversion layer CCL1 may include a first quantum dot QD1.

[0169] In a plan view, the second color conversion layer CCL2 may be disposed within the second opening OP2.

[0170] The second color conversion layer CCL2 may convert the color of the supplied light into green.

[0171] The second color conversion layer CCL2 may include a second quantum dot QD2.

[0172] The quantum dots including the first quantum dot QD1 and the second quantum dot QD2 will be described in detail below.

[0173] In this specification, quantum dots (hereinafter also referred to as semiconductor nanocrystals) include group II-VI compounds, group III-V compounds, group IV-VI compounds, group IV elements or compounds, group I-III-VI compounds, group II-III-VI compounds, group I-II-IV-VI compounds, or any combination thereof.

[0174] Group II-VI compounds include: binary compounds selected from CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS, and mixtures thereof; ternary compounds selected from CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS, and mixtures thereof; and quaternary compounds selected from CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe, and mixtures thereof.

[0175] The Group II-VI compounds may further include Group III metals.

[0176] Group III-V compounds may be selected from binary compounds such as GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, and mixtures thereof, ternary compounds selected from GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InGaP, InNP, InNAs, InNSb, InPAs, InZnP, InPSb, and mixtures thereof, and quaternary compounds selected from GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, and mixtures thereof.

[0177] The Group III-V compounds may further include Group II metals (e.g., InZnP).

[0178] Group IV-VI compounds include binary compounds selected from SnS, SnSe, SnTe, PbS, PbSe, PbTe, and mixtures thereof, ternary compounds selected from SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, and mixtures thereof, and quaternary compounds selected from SnPbSSe, SnPbSeTe, SnPbSTe, and mixtures thereof.

[0179] The Group-IV element or compound is a single element selected from the group consisting of Si, Ge, and any combination thereof, and binary compounds selected from SiC, SiGe, and any combination thereof, but is not limited thereto.

[0180] Examples of Group-I-III-VI compounds include, but are not limited to, CuInSe2, CuInS2, CuInGaSe, and CuInGaS.

[0181] Examples of Group-I-II-IV-VI compounds include, but are not limited to, CuZnSnSe and CuZnSnS.

[0182] Group-II-III-VI compounds include ZnGaS, ZnAlS, ZnInS, ZnGaSe, ZnAlSe, ZnInSe, ZnGaTe, ZnAlTe, ZnInTe, ZnGaO, ZnAlO, ZnInO, HgGaS, HgAlS, HgInS, HgGaSe, HgAlSe, HgInSe, HgGaTe, HgAlTe, HgInTe, MgGaS, MgAlS, MgInS, MgGaSe, MgAlSe, MgInSe, and any combination thereof, but is not limited thereto.

[0183] In an embodiment, the quantum dots may not include cadmium.

[0184] The quantum dots may include semiconductor nanocrystals based on Group-III-V compounds including indium and phosphorus.

[0185] The Group-III-V compounds may further include the Group-II metal zinc.

[0186] The quantum dots may include semiconductor nanocrystals based on Group-II-VI compounds including chalcogens (e.g., sulfur, selenium, tellurium, or any combination thereof) and zinc.

[0187] In the quantum dots, the binary compounds, ternary compounds, and / or quaternary compounds mentioned above may be present in the particles in a uniform (e.g., substantially uniform) concentration distribution, or may be present in the same particles in a distribution of partially different concentrations.

[0188] In an embodiment, one quantum dot may have a core-shell structure surrounding other quantum dots.

[0189] The interface between the core and the shell may have a concentration gradient in which the concentration of the elements present in the shell decreases towards the center of the core.

[0190] In some embodiments, the quantum dots may have a core-shell structure including a core containing the above-mentioned semiconductor nanocrystals and a shell surrounding the core.

[0191] The shell of the quantum dots can be used as a protective layer to maintain semiconductor properties by preventing chemical denaturation of the core and / or as a charge layer to impart electrophoretic properties to the quantum dots.

[0192] The shell can have a single-layer structure or a multi-layer structure.

[0193] The interface between the core and the shell can have a concentration gradient in which the concentration of the elements present in the shell decreases towards the center of the core.

[0194] Examples of the shell of the quantum dots include metal oxides or non-metal oxides, semiconductor compounds, or any combination thereof.

[0195] For example, the metal oxide or non-metal oxide is a binary compound (such as SiO x , Al2O3, TiO2, ZnO, MnO, Mn2O3, Mn3O4, CuO, FeO, Fe2O3, Fe3O4, CoO, Co3O4, NiO) or a ternary compound (MgAl2O4, CoFe2O4, NiFe2O4, CoMn2O4), etc., but the present invention is not limited thereto.

[0196] In addition, the semiconductor compounds include CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnSeS, ZnTeS, GaAs, GaP, GaSb, HgS, HgSe, HgTe, InAs, InP, InGaP, InSb, AlAs, AlP, AlSb, etc., however, the present invention is not limited thereto.

[0197] In addition, the quantum dots can have a structure including a core of a single semiconductor nanocrystal and a multi-layer shell surrounding the core.

[0198] In an embodiment, the multi-layer shell can have two or more layers, such as 2 layers, 3 layers, 4 layers, 5 layers or more layers.

[0199] Two adjacent layers of the shell can have a single composition or different compositions.

[0200] In the multi-layer shell, the composition of each layer can vary along the radius.

[0201] The quantum dots can have a full width at half maximum (FWHM) of the emission wavelength spectrum of about 50 nanometers (nm) or less (for example, about 40 nm or less, about 30 nm or less), and within this range, color purity or color reproducibility can be improved.

[0202] In addition, since the light emitted by these quantum dots is emitted in all directions, the optical viewing angle can be improved.

[0203] The quantum dots can include a shell material and a core material having different band gaps.

[0204] For example, the bandgap of the shell material can be greater than that of the core material.

[0205] In other embodiments, the bandgap of the shell material can be less than that of the core material.

[0206] The quantum dots can have multiple layers of shells.

[0207] In the multiple - layer shell, the bandgap of the outer layer can be greater than that of the inner layer (i.e., the layer closer to the core).

[0208] In the multiple - layer shell, the bandgap of the outer layer can be less than that of the inner layer.

[0209] The quantum dots can control the absorption / emission wavelength by adjusting their composition and size.

[0210] The maximum emission peak wavelength of the quantum dots can be in the range from ultraviolet wavelength to infrared wavelength or longer.

[0211] The quantum dots can have a quantum efficiency of at least about 10% (such as at least about 30%, at least about 50%, at least about 60%, at least about 70%, at least about 90% or even 100%).

[0212] The quantum dots can have a relatively narrow spectrum.

[0213] The quantum dots can have a full width at half maximum of the emission wavelength spectrum of, for example, about 50 nm or less (such as about 45 nm or less, about 40 nm or less, or about 30 nm or less).

[0214] The quantum dots can have a particle size of about 1 nm or greater and about 100 nm or less.

[0215] The particle size refers to the diameter of the particle or the diameter converted by assuming that the two - dimensional image of the particle (obtained by transmission electron microscope analysis) is spherical.

[0216] The quantum dots can have a size in the range of about 1 nm to about 50 nm (such as at least 2 nm, at least 3 nm, or at least 4 nm and at most 50 nm, at most 40 nm, at most 30 nm, at most 20 nm, at most 15 nm).

[0217] The shape of the quantum dots is not particularly limited.

[0218] For example, the shape of the quantum dots can include but is not limited to spheres, polyhedra (e.g., cones, cubes, cuboids), multipods, nanotubes, nanorods, nanowires, nanosheets, or any combination thereof.

[0219] The quantum dots are commercially available or can be appropriately synthesized.

[0220] During the colloidal synthesis of quantum dots, the particle size of the quantum dots can be controlled relatively freely, and the particle size of the quantum dots can also be adjusted uniformly.

[0221] The quantum dots may include organic ligands (e.g., organic ligands having a hydrophobic moiety and / or a hydrophilic moiety).

[0222] The organic ligand residues can bind to the surface of the quantum dots.

[0223] The organic ligands include RCOOH, RNH2, R2NH, R3N, RSH, R3PO, R3P, ROH, RCOOR, RPO(OH)2, RHPOOH, R2POOH, or any combination thereof, where each R is independently a substituted or unsubstituted C3 to C40 aliphatic hydrocarbon group (e.g., a substituted or unsubstituted C3 to C40 (e.g., above C5 and below C24) alkyl group, a substituted or unsubstituted C3 to C40 alkenyl group), a substituted or unsubstituted C6 to C40 (e.g., above C6 and below C20) aromatic hydrocarbon group (e.g., a substituted or unsubstituted C6 to C40 aryl group), or any combination thereof.

[0224] Examples of the organic ligands include thiol compounds such as methanethiol, ethanethiol, propanethiol, butanethiol, pentanethiol, hexanethiol, octanethiol, dodecanethiol, hexadecanethiol, octadecanethiol, and benzyl mercaptan; amines such as methylamine, ethylamine, propylamine, butylamine, pentylamine, hexylamine, octylamine, nonylamine, decylamine, dodecylamine, hexadecylamine, octadecylamine, dimethylamine, diethylamine, dipropylamine, tributylamine, trioctylamine, etc.; carboxylic acid compounds such as formic acid, acetic acid, propionic acid, butyric acid, valeric acid, hexanoic acid, heptanoic acid, octanoic acid, dodecanoic acid, hexadecanoic acid, octadecanoic acid, oleic acid, and benzoic acid; phosphine compounds such as methylphosphine, ethylphosphine, propylphosphine, butylphosphine, pentylphosphine, octylphosphine, dioctylphosphine, tributylphosphine, trioctylphosphine, etc.; oxides of phosphine compounds such as methylphosphine oxide, ethylphosphine oxide, propylphosphine oxide, butylphosphine oxide, pentylphosphine oxide, tributylphosphine oxide, octylphosphine oxide, dioctylphosphine oxide, trioctylphosphine oxide, diphenylphosphine oxide, and triphenylphosphine oxide, etc.; C5 to C20 alkyl phosphinic acids such as hexyl phosphinic acid, octyl phosphinic acid, dodecyl phosphinic acid, tetradecyl phosphinic acid, hexadecyl phosphinic acid, and octadecyl phosphinic acid; C5 to C20 alkyl phosphonic acids.

[0225] As used herein, unless otherwise provided, "substituted" means that a hydrogen of a compound or corresponding moiety is replaced by a substituent, and the substituent is C1-C30 alkyl, C2-C30 alkenyl, C2-C30 alkynyl, C6-C30 aryl, C7-C30 alkaryl, C1-C30 alkoxy, C1-C30 heteroalkyl, C3-C30 heteroalkaryl, C3-C30 cycloalkyl, C3-C30 (or C15) cycloalkenyl, C6-C30 cycloalkynyl, C2-C30 heterocycloalkyl, halogen (-F, -Cl, -Br or -I), hydroxy (-OH), nitro (-NO2), cyano (-CN), amino (-NRR', where R and R' are independently hydrogen or C1-C6 alkyl), azido (-N3), amidino (-C(═NH)NH2)), hydrazino (-NHNH2), hydrazono (═N(NH2)), aldehyde (-C(═O)H), carbamoyl (-C(O)NH2), mercapto (-SH), ester (-C(═O)OR, where R is C1-C6 alkyl or C6-C12 aryl), carboxyl (-COOH) or its salt (-C(═O)OM, where M is an organic or inorganic cation), sulfonic acid (-SO3H) or its salt (-SO3M, where M is an organic or inorganic cation), phosphoric acid (-PO3H2) or its salt (-PO3MH or -PO3M2, where M is an organic or inorganic cation), or a combination thereof.

[0226] As used herein, "monocyclic aromatic ring group" means a carbocyclic group (e.g., C6-C12 aryl or C6-C8 aryl) or a heterocyclic group (e.g., C2-C12 heteroaryl or C2-C4 heteroaryl) that provides a conjugated structure.

[0227] As used herein, "fused polycyclic aromatic ring group" means a cyclic group formed by fusing at least two monocyclic aromatic ring groups, such as C8-C20 aryl, such as C8-C15 aryl, or C4-C20 heteroaryl, such as C4-C15 heteroaryl.

[0228] As used herein, "hetero" means a compound or group that includes atoms other than carbon or hydrogen, such as a compound or group that includes 1-3 heteroatoms selected from N, O, S, Si, P, or a combination thereof.

[0229] The quantum dots may include only organic ligands having a hydrophobic moiety or a mixture of one or more types.

[0230] The organic ligand having a hydrophobic moiety may not contain a photopolymerizable residue (e.g., acrylate group, methacrylate group, etc.).

[0231] According to an embodiment, the transmissive layer TL may be disposed in the third opening OP3.

[0232] The transmissive layer TL may be disposed in a portion corresponding to the blue light emission region BLA in the space separated by the bank BK1. The transmissive layer TL may be disposed in the same layer as the first color conversion layer CCL1 and the second color conversion layer CCL2.

[0233] The transmissive layer TL may transmit the light emitted from the light emitting element ED as it is, or may substantially not convert its wavelength.

[0234] The transmissive layer TL may include a first scatterer SC1.

[0235] The transmissive layer TL may include a polymer resin and a first scatterer SC1 included in the polymer resin.

[0236] The first scatterer SC1 may include at least one selected from SiO x , BaSO4, Al2O3, ZnO, ZrO2, and TiO2.

[0237] In an embodiment, for example, the first scatterer SC1 may include TiO2, but is not limited thereto.

[0238] The first color conversion layer CCL1 may include a first scatterer SC1.

[0239] The first color conversion layer CCL1 may include a first scatterer SC1 of the same type as the first scatterer SC1 included in the transmissive layer TL.

[0240] The second color conversion layer CCL2 according to an embodiment may include a first sub-region CCL2a and a second sub-region CCL2b.

[0241] The first sub-region CCL2a may be disposed adjacent to the bank BK1.

[0242] The first sub-region CCL2a may be in contact with the bank BK1 and may have a shape surrounding the bank BK1 that defines the second opening OP2 in a plan view.

[0243] In a plan view, the first sub-region CCL2a may be spaced apart from the center of the second opening OP2.

[0244] In a plan view, the first sub-region CCL2a may not cover the central portion of the second opening OP2.

[0245] In a plan view, the second sub-region CCL2b may be positioned to overlap with the center of the second opening OP2.

[0246] In a plan view, the first sub-region CCL2a may be disposed between the second sub-region CCL2b and the bank BK1.

[0247] The first sub-region CCL2a may be formed by an inkjet process.

[0248] The first sub-region CCL2a may have a shape that is inclined toward the second insulating layer IL4.

[0249] The first sub-region CCL2a and the second sub-region CCL2b may form a single flat upper surface (e.g., the surface facing the display unit DC), but are not limited thereto, and the surfaces of the first sub-region CCL2a and the second sub-region CCL2b may also form a step or a curved surface.

[0250] The first sub-region CCL2a may include a first scatterer SC1.

[0251] The first sub-region CCL2a may include the same type of first scatterer SC1 as that included in the first color conversion layer CCL1 and the transmissive layer TL.

[0252] The first sub-region CCL2a does not include quantum dots.

[0253] The second sub-region CCL2b may include a second scatterer SC2 and a second quantum dot QD2.

[0254] The second scatterer SC2 may be a different type of scatterer from the first scatterer SC1.

[0255] Each of the first scatterer SC1 and the second scatterer SC2 may have a diameter in the range of about 20 nm to about 500 nm.

[0256] In an embodiment, referring to Figure 4 , the first scatterer SC1 may be TiO2, and in particular, the first scatterer SC1 may have a rutile crystal structure.

[0257] The second scatterer SC2 may be TiO2, and in particular, the second scatterer SC2 may have anatase crystal structure.

[0258] As Figure 4 shown, rutile and anatase are composed of the same type of atoms, and their crystal structures may be different from each other.

[0259] Accordingly, the physical properties of rutile and anatase may be different from each other.

[0260] According to an embodiment, the first scatterer SC1 having a rutile crystal structure may have high characteristics of scattering incident light.

[0261] The second scatterer SC2 having anatase crystal structure may have the characteristics of increasing light transmittance while having low characteristics of reflecting incident light.

[0262] Referring to Figure 5, the green light LG1 incident on the second color conversion layer CCL2 in the front direction can be emitted as the first light EG2 through the second sub-region CCL2b including the second scatterer SC2 having a high light transmittance.

[0263] The blue light LB1 incident on the second color conversion layer CCL2 in the front direction can be converted into green light by the second quantum dot QD2 and emitted as the second light EG1.

[0264] In this embodiment, a large amount of green light emitted from the light-emitting element ED can be emitted as the side light LG2 in the directions of 60 degrees and close to 60 degrees.

[0265] The side light LG2 can be incident on the bank BK1.

[0266] The side light LG2 can be scattered in the first sub-region CCL2a including the first scatterer SC1 having high scattering characteristics, and can be emitted to the outside of the display panel DP (see Figure 1 ) as the third light EG3.

[0267] According to the embodiment, the amount of green light emitted from the front of the display device can be increased.

[0268] Refer to Figure 6 , the first sub-region CCL2a is formed within the second opening OP2.

[0269] The first sub-region CCL2a can include the same material as that of the transmissive layer TL.

[0270] The first sub-region CCL2a and the transmissive layer TL can include the same first scatterer SC1.

[0271] According to the embodiment, the first sub-region CCL2a and the transmissive layer TL can be formed using the same inkjet head.

[0272] Thereafter, as shown in Figure 7 , the second sub-region CCL2b is formed in the remaining portion of the second opening OP2 exposed by the first sub-region CCL2a.

[0273] The second sub-region CCL2b can include the second quantum dot QD2 and the second scatterer SC2.

[0274] A different inkjet head from the one used to form the first sub-region CCL2a can be used to form the second sub-region CCL2b.

[0275] In this specification, the first sub-region CCL2a and the second sub-region CCL2b are shown as forming the same upper surface, but the present invention is not limited thereto, and the first sub-region CCL2a and the second sub-region CCL2b can form an upper surface having a step or a curved surface.

[0276] Return reference Figure 3 A first insulating layer IL3 is disposed between the bank BK1, the first color conversion layer CCL1, the second color conversion layer CCL2, the transmissive layer TL, and the display unit DC.

[0277] The first insulating layer IL3 may have a shape covering the bank BK1, the first color conversion layer CCL1, the second color conversion layer CCL2, and the transmissive layer TL.

[0278] The first insulating layer IL3 may include an inorganic material.

[0279] A filling layer FL may be located between the first insulating layer IL3 and the display unit DC.

[0280] The color conversion unit CC and the display unit DC may be combined by filling the space between the color conversion unit CC and the display unit DC with the filling layer FL.

[0281] Hereinafter, reference will be made to Figures 8 to 10 describe a display panel according to other embodiments.

[0282] Figure 8 , Figure 9 and Figure 10 are cross-sectional views of a display panel according to other embodiments.

[0283] Figure 8 , Figure 9 and Figure 10 The same or similar elements shown in are labeled with the same reference numerals as those used to describe the embodiments of the display panel shown in Figure 3 and any repeated detailed descriptions thereof will be omitted or simplified hereinafter.

[0284] In an embodiment, reference is made to Figure 8 , the second color conversion layer CCL2 includes a first sub-region CCL2a and a second sub-region CCL2b.

[0285] The first sub-region CCL2a may be in contact with the bank BK1 and may have a shape surrounding the bank BK1 that defines the second opening OP2 in a plan view.

[0286] In a plan view, the second sub-region CCL2b may be positioned to overlap the center of the second opening OP2.

[0287] In a plan view, the first sub-region CCL2a may be disposed between the second sub-region CCL2b and the bank BK1.

[0288] The first sub-region CCL2a may include a second quantum dot QD2 and a first scatterer SC1.

[0289] The first sub-region CCL2a may include a first scatterer SC1 of the same type as the first scatterer SC1 included in the first color conversion layer CCL1 and the transmissive layer TL.

[0290] The second sub-region CCL2b may include a second quantum dot QD2 and a second scatterer SC2.

[0291] The second scatterer SC2 may be a scatterer of a different type from the first scatterer SC1.

[0292] In this embodiment, the first scatterer SC1 may be TiO2 having a rutile crystal structure, and the second scatterer SC2 may be TiO2 having anatase crystal structure.

[0293] As Figure 4 shown, rutile and anatase are composed of the same type of atoms, but have different crystal structures, and thus their physical properties may be different from each other.

[0294] The first scatterer SC1 having a rutile crystal structure may have high characteristics of scattering incident light.

[0295] The second scatterer SC2 having anatase crystal structure may have the characteristic of increasing light transmittance while having low characteristics of reflecting incident light.

[0296] In another embodiment, referring to Figure 9 , the transmissive layer TL may include a third sub-region TLa and a fourth sub-region TLb.

[0297] The third sub-region TLa may be in contact with the dam BK1 and may have a shape surrounding the dam BK1 that defines the second opening OP2 in a plan view.

[0298] In the plan view, the fourth sub-region TLb may be positioned to overlap with the center of the third opening OP3.

[0299] In the plan view, the third sub-region TLa may be disposed between the fourth sub-region TLb and the dam BK1.

[0300] The third sub-region TLa may include the first scatterer SC1.

[0301] The third sub-region TLa may include a first scatterer SC1 of the same type as the first scatterer SC1 included in the first sub-region CCL2a and the first color conversion layer CCL1.

[0302] The fourth sub-region TLb may include the second scatterer SC2.

[0303] The fourth sub-region TLb may include a second scatterer SC2 of the same type as the second scatterer SC2 included in the second sub-region CCL2b.

[0304] The first scatterer SC1 can be TiO2 with a rutile crystal structure, and the second scatterer SC2 can be TiO2 with anatase crystal structure.

[0305] Among the light incident on the transmissive layer TL, the light incident laterally toward the bank BK1 can be scattered by the first scatterer SC1 included in the third sub-region TLa and emitted to the front surface.

[0306] In addition, the light incident toward the center of the transmissive layer TL can be transmitted through the second scatterer SC2 included in the fourth sub-region TLb and emitted to the front surface.

[0307] In the transmissive layer TL according to the embodiment, the front light efficiency can be increased.

[0308] Next, referring to Figure 10 , the stacking structure of the display unit DC according to another embodiment can be the same as the stacking structure of the display unit DC described with reference to Figure 3 . Any repeated detailed description of components that are the same as or similar to the above components will be omitted.

[0309] Any repeated detailed description of components that are the same as or similar to the above components will be omitted.

[0310] The color conversion unit CC is disposed on the encapsulation layer ENC.

[0311] The color conversion unit CC includes a second substrate SUB2 that overlaps or is disposed opposite to the first substrate SUB1.

[0312] The second substrate SUB2 can include a flexible material (such as plastic) that can be easily bent, folded, or rolled up.

[0313] The color conversion unit CC can include a bank BK1 disposed on the encapsulation layer ENC.

[0314] The bank BK1 can include a first opening OP1, a second opening OP2, and a third opening OP3. In a plan view, each of the first opening OP1, the second opening OP2, and the third opening OP3 overlaps with a pixel opening.

[0315] The sizes of the first opening OP1, the second opening OP2, and the third opening OP3 can be different from each other or the same as each other.

[0316] The first color conversion layer CCL1 can be disposed within the first opening OP1.

[0317] The first color conversion layer CCL1 can convert the color of the supplied light into red.

[0318] The first color conversion layer CCL1 can include first quantum dots QD1.

[0319] The second color conversion layer CCL2 can be disposed within the second opening OP2.

[0320] The second color conversion layer CCL2 can convert the color of the supplied light into green.

[0321] The second color conversion layer CCL2 can include second quantum dots QD2.

[0322] The transmissive layer TL can be disposed within the third opening OP3.

[0323] The transmissive layer TL can be disposed in a portion corresponding to the blue light emission region BLA in the space separated by the dam BK1.

[0324] The first color conversion layer CCL1 converts the color of the incident light into red and emits red light.

[0325] In addition, the second color conversion layer CCL2 converts the color of the incident light into green and emits green light.

[0326] However, the light incident on the transmissive layer TL is transmitted without color conversion.

[0327] The incident light can include blue light.

[0328] The incident light can be only blue light or a mixture of blue light and green light.

[0329] Alternatively, the incident light can include all of blue light, green light, and red light.

[0330] The transmissive layer TL can include a first scatterer SC1.

[0331] The transmissive layer TL can include a polymer resin and a first scatterer SC1 included in the polymer resin.

[0332] The first scatterer SC1 can include at least one selected from SiO x , BaSO4, Al2O3, ZnO, ZrO2, and TiO2.

[0333] In an embodiment, for example, the first scatterer SC1 can include TiO2, but is not limited thereto.

[0334] The transmissive layer TL can transmit the light emitted from the light-emitting element ED.

[0335] The first color conversion layer CCL1 can include a first scatterer SC1.

[0336] The first color conversion layer CCL1 can include the same type of first scatterer SC1 as the first scatterer SC1 included in the transmissive layer TL.

[0337] According to an embodiment, the second color conversion layer CCL2 may include a first sub-region CCL2a and a second sub-region CCL2b.

[0338] The first sub-region CCL2a may be in contact with the bank BK1 and may have a shape surrounding the bank BK1 that defines the second opening OP2 in a plan view.

[0339] In a plan view, the second sub-region CCL2b may be positioned to overlap with the center of the second opening OP2.

[0340] In a plan view, the first sub-region CCL2a may be disposed between the second sub-region CCL2b and the bank BK1.

[0341] The first sub-region CCL2a may be formed by an inkjet process.

[0342] The first sub-region CCL2a may have a shape inclined toward the encapsulation layer ENC.

[0343] The first sub-region CCL2a and the second sub-region CCL2b may form a flat upper surface (the surface facing the color filters CF1, CF2, and CF3), but is not limited thereto, and the surfaces of the first sub-region CCL2a and the second sub-region CCL2b may also form a step or a curve.

[0344] The first sub-region CCL2a may include a first scatterer SC1.

[0345] The first sub-region CCL2a may include the same type of first scatterer SC1 as the first scatterer SC1 included in the first color conversion layer CCL1 and the transmissive layer TL.

[0346] According to an embodiment, the first sub-region CCL2a may not include quantum dots.

[0347] The second sub-region CCL2b may include a second quantum dot QD2 and a second scatterer SC2.

[0348] The second scatterer SC2 may be a different type of scatterer from the first scatterer SC1.

[0349] The first scatterer SC1 may be TiO2, and in particular, may have a rutile crystal structure.

[0350] The second scatterer SC2 may be TiO2, and in particular, may have anatase crystal structure.

[0351] As Figure 4 shown, rutile and anatase have different crystal structures from each other, and thus their physical properties may be different from each other.

[0352] According to an embodiment, the first scatterer SC1 having a rutile crystal structure may have high characteristics of scattering incident light.

[0353] The second scatterer SC2 having anatase crystal structure may have the characteristics of increasing light transmittance while having low characteristics of reflecting incident light.

[0354] Accordingly, the emission efficiency of the green light incident on the second color conversion layer CCL2 may be improved.

[0355] The first insulating layer IL3, the filling layer FL, and the third insulating layer IL5 may be sequentially provided on the bank BK1, the first color conversion layer CCL1, the second color conversion layer CCL2, and the transmissive layer TL.

[0356] The first insulating layer IL3 may have a shape covering the bank BK1, the first color conversion layer CCL1, the second color conversion layer CCL2, and the transmissive layer TL.

[0357] Each of the first insulating layer IL3, the filling layer FL, and the third insulating layer IL5 may have a shape overlapping with the entire surface of the second substrate SUB2.

[0358] Each of the first insulating layer IL3, the filling layer FL, and the third insulating layer IL5 may include an organic insulating material or an inorganic insulating material, and the inorganic insulating material may include at least one selected from silicon nitride, silicon oxide, and silicon oxynitride.

[0359] According to an embodiment, at least one selected from the first insulating layer IL3 and the third insulating layer IL5 may be omitted.

[0360] The color conversion unit CC includes a first color filter CF1, a second color filter CF2, and a third color filter CF3 provided between the second substrate SUB2 and the display unit DC.

[0361] Hereinafter, reference will be made to Figure 11 Describe the second color conversion layer according to an embodiment.

[0362] Figure 11 Is an image of the second color conversion layer formed by an inkjet process according to an embodiment.

[0363] Figure 11 Is an image for checking whether a first sub-region is formed according to the amount of droplets ejected (or discharged) from an inkjet head when an inkjet process is performed in an opening of a bank (Bank).

[0364] Reference Figure 11 It was confirmed that when 4 drops and 5 drops were discharged from the inkjet head, a first sub-region having an appropriate shape was formed.

[0365] In the case of 10 drops, the area occupied by the first sub-region increases, so the front light efficiency may decrease.

[0366] The second color conversion layer according to the embodiment may include a first sub-region and a second sub-region including different types of scatterers.

[0367] According to the embodiment, the front brightness can be increased by emitting green light incident on the front from the side.

[0368] In this embodiment, the reflectance of the light emitted from the light-emitting element can be reduced.

[0369] The present invention should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the present invention to those skilled in the art.

[0370] Although the present invention has been specifically shown and described with reference to embodiments of the present invention, those of ordinary skill in the art will understand that various changes in form and detail may be made therein without departing from the spirit or scope of the present invention defined by the claims.

Claims

1. A display device, comprising: A first substrate; A transistor disposed on the first substrate; A light-emitting element electrically connected to the transistor; A bank disposed on the light-emitting element, wherein an opening is defined by the bank, and A color conversion layer disposed in the opening, wherein the color conversion layer includes quantum dots, Wherein the color conversion layer includes: A first sub-region adjacent to the bank and including a first scatterer; And A second sub-region overlapping the center of the color conversion layer in a plan view and including a second scatterer, Wherein one of the first scatterer and the second scatterer has a rutile crystal structure, and the other of the first scatterer and the second scatterer has anatase crystal structure.

2. The display device according to claim 1, wherein The first scatterer has a rutile crystal structure, and The second scatterer has anatase crystal structure.

3. The display device according to claim 1, wherein The first sub-region does not include quantum dots, and The second sub-region includes the quantum dots.

4. The display device according to claim 1, further comprising A transmissive layer disposed in another opening defined by the bank, Wherein the transmissive layer includes the first scatterer.

5. The display device according to claim 4, wherein The color conversion layer is a second color conversion layer, The display device further includes a first color conversion layer disposed in yet another opening defined by the bank, and The first color conversion layer includes the first scatterer.

6. The display device according to claim 1, wherein In the plan view, the first sub-region is disposed between the second sub-region and the bank.

7. The display device according to claim 1, wherein Each of the first sub-region and the second sub-region includes the quantum dots.

8. The display device according to claim 4, wherein The transmissive layer includes: A third sub-region including the first scatterer; And A fourth sub-region including the second scatterer.

9. The display device according to claim 1, further comprising: A packaging layer disposed on the light-emitting element; A second substrate disposed opposite to the first substrate; A color filter disposed between the second substrate and the packaging layer; And A filling layer disposed between the color filter and the packaging layer, and the bank and the color conversion layer are disposed between the color filter and the filling layer.

10. The display device according to claim 1, further comprising: A packaging layer disposed on the light-emitting element; A second substrate disposed opposite to the first substrate; A color filter disposed between the second substrate and the packaging layer; And A filling layer disposed between the color filter and the packaging layer, and the bank and the color conversion layer are disposed between the packaging layer and the filling layer.

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