Display device

Abstract

The display device includes: a first light emitting element group including at least one first light emitting element emitting first light having a central wavelength greater than 450 nm and less than about 485 nm; a second light emitting element group including at least one second light emitting element emitting second light having a center wavelength of about 450 nm or less; a third light-emitting element group including at least one third light-emitting element emitting third light, the third light-emitting element group having a center wavelength of about 450 nm or less; and a color conversion layer disposed on the first light-emitting element group, the second light-emitting element group, and the third light-emitting element group, and including a first color conversion pattern converting the second light emitted from the second light-emitting element group, and a second color conversion pattern converting the third light emitted from the third light-emitting element group.

Description

Technical Field

[0001] The present disclosure relates to a display device including a color conversion layer. Background Art

[0002] With the development of information technology, the importance of a display device as a connection medium between a user and information is being highlighted.

[0003] Recently, a display device including a light-emitting element and a color conversion layer has been studied. The color conversion layer can convert the color (or wavelength) of light emitted from the light-emitting element. Summary of the Invention

[0004] Embodiments provide a display device having improved light efficiency and display quality.

[0005] A display device according to an embodiment may include: a first light-emitting element group including at least one first light-emitting element that emits first light having a central wavelength greater than about 450 nm and less than about 485 nm; a second light-emitting element group including at least one second light-emitting element that emits second light having a central wavelength less than or equal to about 450 nm; a third light-emitting element group including at least one third light-emitting element that emits third light having a central wavelength less than or equal to about 450 nm; and a color conversion layer disposed on the first light-emitting element group, the second light-emitting element group, and the third light-emitting element group, and including a first color conversion pattern that converts light emitted from the second light-emitting element group and a second color conversion pattern that converts light emitted from the third light-emitting element group.

[0006] In an embodiment, the color conversion layer may further include a light transmission pattern that transmits light emitted from the first light-emitting element group.

[0007] In an embodiment, the light transmission pattern may overlap with the first light-emitting element group in a plan view, the first color conversion pattern may overlap with the second light-emitting element group in a plan view, and the second color conversion pattern may overlap with the third light-emitting element group in a plan view.

[0008] In an embodiment, the light transmission pattern may include a first scatterer, and each of the first color conversion pattern and the second color conversion pattern may include quantum dots.

[0009] In an embodiment, each of the first color conversion pattern and the second color conversion pattern may further include a second scatterer.

[0010] In an embodiment, the first color conversion pattern may convert light emitted from the second light-emitting element group into green light, and the second color conversion pattern may convert light emitted from the third light-emitting element group into red light.

[0011] In an embodiment, the light conversion efficiency of the first color conversion pattern with respect to the light emitted from the second light emitting element group may be greater than or equal to about 30%, and the light conversion efficiency of the second color conversion pattern with respect to the light emitted from the third light emitting element group may be greater than or equal to about 35%.

[0012] In an embodiment, the central wavelength of the first light emitted by at least one first light emitting element may be in the range of about 460 nm to about 470 nm.

[0013] In an embodiment, the color matching rate of the display device may be greater than or equal to about 90%.

[0014] In an embodiment, the display device may further include a color filter layer disposed on the color conversion layer.

[0015] In an embodiment, each of at least one first light emitting element, at least one second light emitting element, and at least one third light emitting element may be an ultra-small light emitting element.

[0016] In an embodiment, the central wavelength of the second light emitted from at least one second light emitting element and the central wavelength of the third light emitted from at least one third light emitting element may be the same.

[0017] In an embodiment, the central wavelength of the second light emitted from at least one second light emitting element and the central wavelength of the third light emitted from at least one third light emitting element may be different from each other.

[0018] In an embodiment, the second light emitting element group may further include at least one third light emitting element, and the third light emitting element group may further include at least one second light emitting element.

[0019] A display device according to an embodiment may include: a first light emitting element group including at least one first light emitting element that emits first light having a central wavelength greater than about 450 nm and less than about 485 nm; a second light emitting element group including at least one second light emitting element that emits second light having a central wavelength greater than or equal to about 500 nm; a third light emitting element group including at least one third light emitting element that emits third light having a central wavelength less than or equal to about 450 nm; and a color conversion layer disposed on the first light emitting element group, the second light emitting element group, and the third light emitting element group, and including a color conversion pattern that converts the color of the light emitted from the third light emitting element group.

[0020] In an embodiment, the color conversion layer may further include a first light transmission pattern that transmits the first light emitted from the first light emitting element group and a second light transmission pattern that transmits the second light emitted from the second light emitting element group.

[0021] In an embodiment, the first light-transmitting pattern may overlap with the first light-emitting element group in a plan view, the second light-transmitting pattern may overlap with the second light-emitting element group in a plan view, and the color conversion pattern may overlap with the third light-emitting element group in a plan view.

[0022] In an embodiment, each of the first light-transmitting pattern and the second light-transmitting pattern may include a first scatterer, and the color conversion pattern may include quantum dots and a second scatterer.

[0023] In an embodiment, the central wavelength of the first light emitted from at least one first light-emitting element may be in the range of about 460 nm to about 470 nm.

[0024] In an embodiment, the color matching rate of the display device may be greater than or equal to about 90%.

[0025] In an embodiment, the display device may further include a color filter layer disposed on the color conversion layer.

[0026] In an embodiment, each of at least one first light-emitting element, at least one second light-emitting element, and at least one third light-emitting element may be an ultra-small light-emitting element.

[0027] In a display device according to an embodiment, the display device may include: a first light-emitting element group including light-emitting elements that emit light having a central wavelength greater than about 450 nm and less than about 485 nm; a second light-emitting element group including light-emitting elements that emit light having a central wavelength of about 450 nm or less. The display device may include a color conversion pattern that converts the light emitted from the second light-emitting element group. The display device may include a light-transmitting pattern that transmits the light emitted from the first light-emitting element group.

[0028] Since the second light-emitting element group corresponding to the color conversion pattern emits light having a central wavelength of about 450 nm or less, the light conversion efficiency of the color conversion pattern with respect to the light emitted from the second light-emitting element group can be improved.

[0029] Even when the central wavelength of the light emitted from the second light-emitting element group is about 450 nm or less, since the first light-emitting element group corresponding to the light-transmitting pattern emits light having a central wavelength greater than about 450 nm and less than about 485 nm, the display device may have an improved color matching rate.

[0030] Therefore, according to an embodiment, the light conversion efficiency of the color conversion pattern can be improved without reducing the color matching rate of the display device. Therefore, the light efficiency and display quality of the display device can be improved.

[0031] It should be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Exemplary, non - limiting embodiments will be more clearly understood from the following detailed description in conjunction with the accompanying drawings.

[0033] Figure 1 is a plan view showing a display device according to an embodiment.

[0034] Figure 2 is showing Figure 1 a schematic cross - sectional view of the display device.

[0035] Figure 3 is showing Figure 2 a plan view of the light - emitting element layer.

[0036] Figure 4 is along Figure 1 a schematic cross - sectional view taken along line I - I' of.

[0037] Figure 5 is a plan view showing a display device according to an embodiment.

[0038] Figure 6 is showing the light - emitting element layer included in Figure 5 the display device.

[0039] Figure 7 is along Figure 5 a schematic cross - sectional view taken along line II - II' in.

[0040] Figure 8 is along Figure 5 a schematic cross - sectional view taken along line III - III' in.

[0041] Figure 9 is a plan view showing a display device according to an embodiment.

[0042] Figure 10 is showing the light - emitting element layer included in Figure 9 the display device.

[0043] Figure 11 is along Figure 9 a schematic cross - sectional view taken along line IV - IV' of.

[0044] Figure 12 is a plan view showing a display device according to an embodiment.

[0045] Figure 13 is showing the light - emitting element layer included in Figure 12Plan view of a light-emitting element layer in a display device.

[0046] Figure 14 is a schematic cross-sectional view taken along line V-V' of Figure 12 . DETAILED DESCRIPTION

[0047] The embodiments will now be described more fully hereinafter with reference to the accompanying drawings in which various embodiments are shown. However, the present disclosure 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 disclosure to those skilled in the art. Like reference numerals always denote like elements.

[0048] When an element such as a layer is referred to as being "on," "connected to," or "coupled to" another element or layer, it can be directly on, directly connected to, or directly coupled to the other element or layer, or intervening elements or layers may be present. However, when an element or layer is referred to as being "directly" on, "directly connected to," or "directly coupled to" another element or layer, no intervening elements or layers are present. For this reason, the term "connected" can refer to physical connection, electrical connection, and / or fluid connection with or without intervening elements.

[0049] For the purposes of the present disclosure, "at least one of A and B" can be construed to be only A, only B, or any combination of A and B. In addition, "at least one of X, Y, and Z" and "at least one selected from the group consisting of X, Y, and Z" can be construed to be only X, only Y, only Z, or any combination of two or more of X, Y, and Z. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0050] Although the terms "first," "second," etc. may be used herein to describe various types of elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another. Thus, a first element discussed below may be referred to as a second element without departing from the teachings of the present disclosure.

[0051] For purposes of description, spatial relative terms such as "below", "beneath", "under", "lower", "above", "upper", "on top of", "higher", "side" (e.g., as in "sidewall") may be used herein and thereby to describe the relationship of one element to another(s) as shown in the figures. In addition to the orientation depicted in the figures, the spatial relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture. For example, if the device in the figures is turned over, an element described as "below" or "beneath" another element or feature will then be oriented "above" the other element or feature. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (e.g., rotated 90 degrees or at other orientations), and thus, the spatial relative descriptors used herein are to be interpreted accordingly.

[0052] The terms used herein are for the purpose of describing particular embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, as used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well. Further, when used in this specification, the terms "comprises", "comprising", "includes", and / or "including" specify the presence of the stated features, integers, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should also be noted that, as used herein, the terms "substantially", "about", and other similar terms are used as approximate terms and not as degree terms, and thus, are used to account for the inherent deviations in measured, calculated, and / or provided values that would be recognized by a person of ordinary skill in the art.

[0053] Unless otherwise defined or implied herein, all terms (including technical and scientific terms) used have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It will also be 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 should not be interpreted in an idealized or overly formal sense unless expressly so defined in this specification.

[0054] Figure 1 is a plan view showing a display device according to an embodiment.

[0055] Reference Figure 1, the display device DD can have various shapes. In an embodiment, the display device DD can be arranged in a rectangular shape in a plan view, but the display device DD is not limited thereto. For example, the display device DD can have a circular or oval shape in a plan view. The display device DD can include angled corners and / or curved corners. For ease of explanation, Figure 1 An embodiment is shown in which the display device DD has a rectangular shape, and the rectangular shape has a pair of long sides and a pair of short sides, and the extending direction of the long side is represented as the first direction DR1, the extending direction of the short side is represented as the second direction DR2, and the direction perpendicular to the extending directions of the long side and the short side is represented as the third direction DR3.

[0056] The display device DD can include a display area DA and a peripheral area PA. The display area DA can be an area capable of displaying an image by generating light or adjusting the transmittance of light provided from an external light source.

[0057] A plurality of pixels can be arranged in the display area DA. For example, the display area DA can include a plurality of pixel areas PXA in which pixels are arranged. The pixels (i.e., pixel areas PXA) can be arranged in a matrix form along the first direction DR1 and the second direction DR2.

[0058] The peripheral area PA can be positioned adjacent to the display area DA. For example, the peripheral area PA can completely surround the display area DA in a plan view. Various wirings and drivers connected to the pixels can be provided in the peripheral area PA.

[0059] The pixel area PXA can include a first pixel area PXA1, a second pixel area PXA2, and a third pixel area PXA3. For example, light of the same color can be emitted from all of the first pixel area PXA1, light of the same color can be emitted from all of the second pixel area PXA2, and light of the same color can be emitted from the third pixel area PXA3.

[0060] Therefore, a group of first pixel areas PXA1 can be defined as a first pixel group PXG1 that emits light of one color, and a group of second pixel areas PXA2 can be defined as a second pixel group PXG2 that emits light of one color, and a group of third pixel areas PXA3 can be defined as a third pixel group PXG3 that emits light of one color.

[0061] In an embodiment, red light, green light, and blue light may be selectively emitted from a first pixel region PXA1, a second pixel region PXA2, and a third pixel region PXA3. For example, blue light may be emitted from the first pixel region PXA1, green light may be emitted from the second pixel region PXA2, and red light may be emitted from the third pixel region PXA3. For example, the first pixel group PXG1 may be a group of first pixel regions PXA1 that emit blue light, the second pixel group PXG2 may be a group of second pixel regions PXA2 that emit green light, and the third pixel group PXG3 may be a group of third pixel regions PXA3 that emit red light. However, the present disclosure is not necessarily limited thereto.

[0062] Figure 1 The planar arrangement of the pixel regions PXA shown in is merely an embodiment, but the present disclosure is not limited thereto, and the arrangement of the pixel regions PXA may be variously changed according to the embodiment.

[0063] Figure 2 is a schematic cross-sectional view of Figure 1 a display device.

[0064] Referring to Figure 1 and Figure 2 , the display device DD may include a substrate SUB, a circuit element layer CEL, a light-emitting element layer LEL, and a light conversion layer LCL.

[0065] The substrate SUB may include a transparent or opaque material. For example, the substrate SUB may include glass, quartz, plastic, etc. These may be used alone or in combination with each other. When the substrate SUB is made of rigid glass, the display device DD may be implemented as a rigid display device. When the substrate SUB is made of flexible plastic, the display device DD may be implemented as a flexible display device.

[0066] The circuit element layer CEL may be disposed on the substrate SUB. The circuit element layer CEL may include at least one transistor and signal lines connected to the transistor. For example, the transistor may include an active pattern, a gate electrode, a source electrode, and a drain electrode, and may have a structure in which the active pattern and the gate electrode are sequentially stacked and an insulating layer is interposed between the gate electrode and the active pattern. The active pattern may include a silicon semiconductor material, an oxide semiconductor material, or an organic semiconductor material. Each of the gate electrode, the source electrode, and the drain electrode may include a metal, an alloy, a conductive metal oxide, a transparent conductive material, etc.

[0067] The light-emitting element layer LEL may be disposed on the circuit element layer CEL. The light-emitting element layer LEL may include light-emitting elements that emit light. The light-emitting elements may be driven by transistors and signal lines included in the circuit element layer CEL. In an embodiment, the light-emitting elements may be ultra-small light-emitting elements such as micron-scale light-emitting elements or nano-scale light-emitting elements. For example, the light-emitting elements may be ultra-small light-emitting elements such as micron-scale light-emitting elements.

[0068] According to an embodiment, a packaging layer may be disposed on the light-emitting element layer LEL. The packaging layer may include at least one inorganic layer and at least one organic layer. The packaging layer may prevent external air and / or moisture from penetrating into the light-emitting element layer LEL and the circuit element layer CEL.

[0069] The light conversion layer LCL may be disposed on the light-emitting element layer LEL. The light conversion layer LCL may include a color conversion layer. For example, the light conversion layer LCL may convert the color (or wavelength) of the light emitted from the light-emitting element layer LEL through the color conversion layer. In an embodiment, the light conversion layer LCL may selectively transmit light of a specific color (or wavelength) through a color filter layer. In an embodiment, the light conversion layer LCL may be formed on the surface of the light-emitting element layer LEL through a continuous process. However, the present disclosure is not necessarily limited thereto, and the light conversion layer LCL may be formed separately and joined to the light-emitting element layer LEL through a separate process. Hereinafter, for the sake of convenience of explanation, an embodiment in which the light conversion layer LCL is formed on the surface of the light-emitting element layer LEL through a continuous process will be described.

[0070] Figure 3 is a plan view showing Figure 2 the light-emitting element layer.

[0071] Further referring to Figure 3 , since the display device DD has a display area DA and a peripheral area PA, the light-emitting element layer LEL may also be divided into a display area DA and a peripheral area PA.

[0072] The light-emitting element layer LEL may include light-emitting elements LD. The light-emitting elements LD may include a first light-emitting element LD1, a second light-emitting element LD2, and a third light-emitting element LD3.

[0073] The light-emitting elements LD may be disposed in the display area DA. For example, the light-emitting elements LD may be disposed in Figure 1In each of the pixel regions PXA. For example, a set of light-emitting elements of the light-emitting element LD provided in the first pixel region PXA1 may be defined as a first light-emitting element group LDG1. A set of light-emitting elements of the light-emitting element LD provided in the second pixel region PXA2 may be defined as a second light-emitting element group LDG2. A set of light-emitting elements of the light-emitting element LD provided in the third pixel region PXA3 may be defined as a third light-emitting element group LDG3. For example, each of the first light-emitting element group LDG1, the second light-emitting element group LDG2, and the third light-emitting element group LDG3 may include at least one light-emitting element.

[0074] In an embodiment, as Figure 3 shown, the first light-emitting element group LDG1 may be a set of first light-emitting elements LD1, the second light-emitting element group LDG2 may be a set of second light-emitting elements LD2, and the third light-emitting element group LDG3 may be a set of third light-emitting elements LD3. In other words, in an embodiment, the first light-emitting element LD1 may be provided in the first pixel region PXA1, the second light-emitting element LD2 may be provided in the second pixel region PXA2, and the third light-emitting element LD3 may be provided in the third pixel region PXA3. However, the present disclosure is not necessarily limited thereto.

[0075] Figure 3 The planar arrangement of the light-emitting element LD shown in

[0076] Figure 4 is only an embodiment and can be variously changed according to the embodiment. Figure 1 is a schematic cross-sectional view taken along the line I-I'.

[0077] Further referring to Figure 4 , a circuit element layer CEL, a light-emitting element layer LEL, and a light conversion layer LCL may be provided on a substrate SUB.

[0078] The light-emitting element LD may be provided in an emission region EA. In an embodiment, the first light-emitting element LD1 may be provided in the emission region EA of the first pixel region PXA1, the second light-emitting element LD2 may be provided in the emission region EA of the second pixel region PXA2, and the third light-emitting element LD3 may be provided in the emission region EA of the third pixel region PXA3.

[0079] All of the first light-emitting elements LD1 may emit light of the same composition (e.g., center wavelength, color, etc.), all of the second light-emitting elements LD2 may emit light of the same composition, and all of the third light-emitting elements LD3 may emit light of the same composition.

[0080] For example, each of the first light-emitting elements LD1 may emit a first light L1, each of the second light-emitting elements LD2 may emit a second light L2, and each of the third light-emitting elements LD3 may emit a third light L3. In an embodiment, all of the first light L1, the second light L2, and the third light L3 may be blue light. However, the present disclosure is not necessarily limited thereto.

[0081] In an embodiment, the center wavelength of the second light L2 and the center wavelength of the third light L3 may be shorter than the center wavelength of the first light L1. For example, each of the second light L2 and the third light L3 may have a wavelength shorter than that of the first light L1.

[0082] In an embodiment, the center wavelength of the first light L1 emitted from the first light-emitting element LD1 may be greater than about 450 nm and less than about 485 nm. In an embodiment, each of the center wavelength of the second light L2 emitted from the second light-emitting element LD2 and the center wavelength of the third light L3 emitted from the third light-emitting element LD3 may be less than or equal to about 450 nm.

[0083] For example, the center wavelength of the first light L1 emitted from the first light-emitting element LD1 may be in the range of about 460 nm to about 470 nm. For example, the center wavelength of the first light L1 emitted from the first light-emitting element LD1 may be in the range of about 465 nm to about 468 nm. For example, each of the center wavelength of the second light L2 emitted from the second light-emitting element LD2 and the center wavelength of the third light L3 emitted from the third light-emitting element LD3 may be in the range of about 360 nm to about 450 nm. For example, each of the center wavelength of the second light L2 emitted from the second light-emitting element LD2 and the center wavelength of the third light L3 emitted from the third light-emitting element LD3 may be in the range of about 400 nm to about 450 nm.

[0084] For example, the first light-emitting element LD1 may emit blue first light L1 having a center wavelength greater than about 450 nm and less than about 485 nm, the second light-emitting element LD2 may emit blue second light L2 having a center wavelength less than or equal to about 450 nm, and the third light-emitting element LD3 may emit blue third light L3 having a center wavelength less than or equal to about 450 nm.

[0085] Since the second light-emitting element LD2 emits the second light L2 having a center wavelength less than or equal to about 450 nm, the light conversion efficiency of the color conversion pattern described below with respect to the second light L2 can be improved. Similarly, since the third light-emitting element LD3 emits the third light L3 having a center wavelength less than or equal to about 450 nm, the light conversion efficiency of the color conversion pattern described below with respect to the third light L3 can be improved. This will be described in more detail below.

[0086] Even when the center wavelength of the second light L2 and the center wavelength of the third light L3 are each less than or equal to about 450 nm, since the first light-emitting element LD1 emits the first light L1 having a center wavelength greater than about 450 nm and less than about 485 nm, the display device DD can have an improved color matching rate. For example, the display device DD can have a BT2020 color matching rate greater than or equal to about 90%. This will be described in more detail below. The BT2020 color matching rate can be the ratio of the variation region formed by the variation coordinates (coordinates of the actually realized color) to the reference region formed by the reference coordinates representing the color standard of UHD (4K).

[0087] In an embodiment, the center wavelength of the second light L2 and the center wavelength of the third light L3 can be the same. However, the present disclosure is not necessarily limited thereto, and in an embodiment, the center wavelength of the second light L2 and the center wavelength of the third light L3 can be different from each other. For example, the center wavelength of the second light L2 can be shorter than the center wavelength of the third light L3. For example, the center wavelength of the third light L3 can be shorter than the center wavelength of the second light L2.

[0088] The light conversion layer LCL can be provided on the light-emitting element layer LEL. In an embodiment, the light conversion layer LCL can include a color conversion layer CCL, a planarization layer PLN, and a color filter layer CFL.

[0089] The color conversion layer CCL can include a light transmission pattern LTP, a first color conversion pattern CCP1, a second color conversion pattern CCP2, and a bank BNK.

[0090] The bank BNK can be provided on the light-emitting element layer LEL. The bank BNK can surround the emission region EA in a plan view. The bank BNK can provide a space in which the light transmission pattern LTP, the first color conversion pattern CCP1, and the second color conversion pattern CCP2 are formed. Therefore, the bank BNK can have a grid shape or a matrix shape in a plan view. In an embodiment, the bank BNK can include an organic material. In an embodiment, the bank BNK can further include a light-blocking material. For example, the bank BNK can include a light-blocking material such as a black pigment, a dye, carbon black, etc. The bank BNK can overlap with the non-emission region NEA in a plan view. In an embodiment, the bank BNK can also be omitted.

[0091] In an embodiment, the light transmission pattern LTP may be disposed in the first pixel region PXA1. Specifically, the light transmission pattern LTP may be disposed in the emission region EA of the first pixel region PXA1. Accordingly, the light transmission pattern LTP may overlap with the first light-emitting element group LDG1 in a plan view. For example, the light emitted from the first light-emitting element group LDG1 may be incident on the light transmission pattern LTP. For example, the first light L1 emitted from the first light-emitting element LD1 that defines the first light-emitting element group LDG1 may be incident on the light transmission pattern LTP.

[0092] The light transmission pattern LTP may transmit the light emitted from the first light-emitting element group LDG1. For example, the light transmission pattern LTP may emit light having substantially the same components (e.g., center wavelength, color, etc.) as the light emitted from the first light-emitting element group LDG1.

[0093] For example, the light transmission pattern LTP may transmit the first light L1 emitted from the first light-emitting element LD1 that defines the first light-emitting element group LDG1 without conversion. For example, the light transmission pattern LTP may emit blue light Lb having substantially the same components (e.g., center wavelength, color, etc.) as the first light L1 emitted from the first light-emitting element LD1.

[0094] In an embodiment, the light transmission pattern LTP may include a first base resin BR1 and a first scatterer SCT1.

[0095] The first scatterer SCT1 may increase the optical path by scattering the light emitted from the first light-emitting element group LDG1 and incident on the light transmission pattern LTP. The first scatterer SCT1 may include a metal oxide. For example, the first scatterer SCT1 may include TiO2, ZrO2, Al2O3, In2O3, ZnO, SnO2, Sb2O3, ITO, etc. These may be used alone or in combination with each other.

[0096] The first scatterer SCT1 may be dispersed in the first base resin BR1. For example, the first base resin BR1 may include an epoxy resin, an acrylic resin, a phenolic resin, a melamine resin, a Cardo resin, an imide resin, etc. These may be used alone or in combination with each other.

[0097] In an embodiment, the first color conversion pattern CCP1 may be disposed in the second pixel region PXA2. Specifically, the first color conversion pattern CCP1 may be disposed in the emission region EA of the second pixel region PXA2. Accordingly, the first color conversion pattern CCP1 may overlap with the second light-emitting element group LDG2 in a plan view. For example, the light emitted from the second light-emitting element group LDG2 may be incident on the first color conversion pattern CCP1. For example, the second light L2 emitted from the second light-emitting element LD2 that defines the second light-emitting element group LDG2 may be incident on the first color conversion pattern CCP1.

[0098] The first color conversion pattern CCP1 may emit light having a different component (e.g., center wavelength, color, etc.) from the light emitted from the second light-emitting element group LDG2. In an embodiment, the first color conversion pattern CCP1 may convert the light emitted from the second light-emitting element group LDG2 into green light Lg.

[0099] For example, the first color conversion pattern CCP1 may convert the second light L2 emitted from the second light-emitting element LD2 that defines the second light-emitting element group LDG2 into green light Lg. In other words, the first color conversion pattern CCP1 may emit green light Lg having a different component (e.g., center wavelength, color, etc.) from the second light L2 emitted from the second light-emitting element LD2.

[0100] In an embodiment, the first color conversion pattern CCP1 may include a second base resin BR2 and first color conversion particles QD1.

[0101] The first color conversion particles QD1 may convert the color (or wavelength) of the light emitted from the second light-emitting element group LDG2 and incident on the first color conversion pattern CCP1. For example, the first color conversion particles QD1 may include quantum dots that absorb blue light and emit green light. The quantum dots may include a semiconductor material having nanocrystals. Depending on the composition and size of the quantum dots, the quantum dots may have a bandgap. Accordingly, the quantum dots may absorb incident light and emit light having a different color (or wavelength) from the incident light.

[0102] The first color conversion particles QD1 may be dispersed in the second base resin BR2. For example, the second base resin BR2 may include an epoxy resin, an acrylic resin, a phenolic resin, a melamine resin, a cardo resin, an imide resin, etc. These may be used alone or in combination with each other.

[0103] In an embodiment, the first color conversion pattern CCP1 may further include a second scatterer SCT2 dispersed in the second base resin BR2. The second scatterer SCT2 can increase the optical path by scattering the light emitted from the second light-emitting element group LDG2 and incident on the first color conversion pattern CCP1. The second scatterer SCT2 may include a metal oxide. For example, the second scatterer SCT2 may include TiO2, ZrO2, Al2O3, In2O3, ZnO, SnO2, Sb2O3, ITO, etc. These can be used alone or in combination with each other.

[0104] In an embodiment, the second color conversion pattern CCP2 may be disposed in the third pixel region PXA3. Specifically, the second color conversion pattern CCP2 may be disposed in the emission region EA of the third pixel region PXA3. Thus, the second color conversion pattern CCP2 may overlap with the third light-emitting element group LDG3 in a plan view. For example, the light emitted from the third light-emitting element group LDG3 may be incident on the second color conversion pattern CCP2. For example, the third light L3 emitted from the third light-emitting element LD3 that defines the third light-emitting element group LDG3 may be incident on the second color conversion pattern CCP2.

[0105] The second color conversion pattern CCP2 may emit light having a different composition (e.g., central wavelength, color, etc.) from the light emitted from the third light-emitting element group LDG3. In an embodiment, the second color conversion pattern CCP2 may convert the light emitted from the third light-emitting element group LDG3 into red light Lr.

[0106] For example, the second color conversion pattern CCP2 may convert the third light L3 emitted from the third light-emitting element LD3 that defines the third light-emitting element group LDG3 into red light Lr. In other words, the second color conversion pattern CCP2 may emit red light Lr having a different composition (e.g., central wavelength, color, etc.) from the third light L3 emitted from the third light-emitting element LD3.

[0107] In an embodiment, the second color conversion pattern CCP2 may include a third base resin BR3 and second color conversion particles QD2.

[0108] The second color conversion particles QD2 may convert the color (or wavelength) of the light emitted from the third light-emitting element group LDG3 and incident on the second color conversion pattern CCP2. For example, the second color conversion particles QD2 may include quantum dots that absorb blue light and emit red light. The quantum dots may include a semiconductor material having nanocrystals. Depending on the composition and size of the quantum dots, the quantum dots may have a bandgap. Thus, the quantum dots can absorb incident light and emit light having a different color (or wavelength) from the incident light.

[0109] The second color conversion particle QD2 can be dispersed in the third base resin BR3. For example, the third base resin BR3 can include epoxy resin, acrylic resin, phenolic resin, melamine resin, cardo resin, imide resin, etc. These can be used alone or in combination with each other.

[0110] In an embodiment, the second color conversion pattern CCP2 may further include a third scatterer SCT3 dispersed in the third base resin BR3. The third scatterer SCT3 can increase the optical path by scattering the light emitted from the third light-emitting element group LDG3 and incident on the second color conversion pattern CCP2. The third scatterer SCT3 can include metal oxides. For example, the third scatterer SCT3 can include TiO2, ZrO2, Al2O3, In2O3, ZnO, SnO2, Sb2O3, ITO, etc. These can be used alone or in combination with each other.

[0111] In an embodiment, a planarization layer PLN can be provided on the color conversion layer CCL. The planarization layer PLN can include an organic material and / or an inorganic material. The planarization layer PLN can compensate for the level difference in the color conversion layer CCL. In an embodiment, the planarization layer PLN can be omitted in consideration of the surface shape of the color conversion layer CCL.

[0112] The color filter layer CFL can be provided on the color conversion layer CCL. The color filter layer CFL can include a first color filter CF1, a second color filter CF2, a third color filter CF3, and a black matrix BM.

[0113] The black matrix BM can surround the emission region EA in a plan view. For example, the black matrix BM can overlap with the non-emission region NEA in a plan view. In an embodiment, the black matrix BM can include a light-blocking material. For example, the black matrix BM can include a light-blocking material such as a black pigment, a dye, carbon black, etc. The black matrix BM can prevent color mixing of the light emitted from adjacent pixel regions PXA.

[0114] The first color filter CF1 can be provided in the first pixel region PXA1. Specifically, the first color filter CF1 can be provided in the emission region EA of the first pixel region PXA1. Therefore, the first color filter CF1 can overlap with the first light-emitting element group LDG1 and the light transmission pattern LTP in a plan view. In an embodiment, the first color filter CF1 can be a blue color filter that selectively transmits blue light Lb.

[0115] The second color filter CF2 may be disposed in the second pixel region PXA2. Specifically, the second color filter CF2 may be disposed in the emission region EA of the second pixel region PXA2. Accordingly, the second color filter CF2 may overlap with the second light-emitting element group LDG2 and the first color conversion pattern CCP1 in a plan view. In an embodiment, the second color filter CF2 may be a green color filter that selectively transmits green light Lg.

[0116] The third color filter CF3 may be disposed in the third pixel region PXA3. Specifically, the third color filter CF3 may be disposed in the emission region EA of the third pixel region PXA3. Accordingly, the third color filter CF3 may overlap with the third light-emitting element group LDG3 and the second color conversion pattern CCP2 in a plan view. In an embodiment, the third color filter CF3 may be a red color filter that selectively transmits red light Lr.

[0117] In Figure 4 the first color filter CF1, the second color filter CF2, and the third color filter CF3 are shown to be spaced apart from each other by the black matrix BM, but the present disclosure is not necessarily limited thereto. For example, the first color filter CF1, the second color filter CF2, and the third color filter CF3 may be arranged to overlap with each other in the non-emission region NEA in a plan view. The first color filter CF1, the second color filter CF2, and the third color filter CF3 that overlap with each other in the non-emission region NEA may define a light-blocking structure, and the black matrix BM may be omitted.

[0118] According to an embodiment, the display device DD may include: a first light-emitting element group LDG1 including a first light-emitting element LD1 that emits first light L1 having a center wavelength greater than about 450 nm and less than about 485 nm; a second light-emitting element group LDG2 including a second light-emitting element LD2 that emits second light L2 having a center wavelength less than or equal to about 450 nm; and a third light-emitting element group LDG3 including a third light-emitting element LD3 that emits third light L3 having a center wavelength less than or equal to about 450 nm.

[0119] The display device DD may include a light-transmission pattern LTP that transmits light emitted from the first light-emitting element group LDG1, a first color conversion pattern CCP1 that converts light emitted from the second light-emitting element group LDG2, and a second color conversion pattern CCP2 that converts light emitted from the third light-emitting element group LDG3.

[0120] Since the second light-emitting element group LDG2 corresponding to the first color conversion pattern CCP1 emits light having a center wavelength less than or equal to about 450 nm, the light conversion efficiency of the first color conversion pattern CCP1 with respect to the light emitted from the second light-emitting element group LDG2 may be improved.

[0121] For example, when the second light-emitting element group LDG2 corresponding to the first color conversion pattern CCP1 emits light having a central wavelength exceeding 450 nm, the light conversion efficiency of the first color conversion pattern CCP1 with respect to the light emitted from the second light-emitting element group LDG2 may be less than about 30%. On the other hand, when the second light-emitting element group LDG2 corresponding to the first color conversion pattern CCP1 emits light having a central wavelength less than or equal to about 450 nm, the light conversion efficiency of the first color conversion pattern CCP1 with respect to the light emitted from the second light-emitting element group LDG2 can be greater than or equal to about 30%.

[0122] Since the third light-emitting element group LDG3 corresponding to the second color conversion pattern CCP2 emits light having a central wavelength less than or equal to about 450 nm, the light conversion efficiency of the second color conversion pattern CCP2 with respect to the light emitted from the third light-emitting element group LDG3 can be improved.

[0123] For example, when the third light-emitting element group LDG3 corresponding to the second color conversion pattern CCP2 emits light having a central wavelength exceeding 450 nm, the light conversion efficiency of the second color conversion pattern CCP2 with respect to the light emitted from the third light-emitting element group LDG3 may be less than about 35%. On the other hand, when the third light-emitting element group LDG3 corresponding to the second color conversion pattern CCP2 emits light having a central wavelength less than or equal to about 450 nm, the light conversion efficiency of the second color conversion pattern CCP2 with respect to the light emitted from the third light-emitting element group LDG3 can be greater than or equal to about 35%.

[0124] Even when the central wavelength of the light emitted from the second light-emitting element group LDG2 and the central wavelength of the light emitted from the third light-emitting element group LDG3 are less than about 450 nm, since the first light-emitting element group LDG1 corresponding to the light transmission pattern LTP emits light having a central wavelength greater than about 450 nm and less than about 485 nm, the display device DD can have an improved color matching rate.

[0125] For example, when the center wavelength of the light emitted from the second light-emitting element group LDG2 and the center wavelength of the light emitted from the third light-emitting element group LDG3 are less than or equal to about 450 nm, and the first light-emitting element group LDG1 corresponding to the light transmission pattern LTP emits light having a center wavelength of less than about 450 nm, the BT2020 color matching ratio of the display device DD may be less than about 90%. On the other hand, when the center wavelength of the light emitted from the second light-emitting element group LDG2 and the center wavelength of the light emitted from the third light-emitting element group LDG3 are less than or equal to about 450 nm, and the first light-emitting element group LDG1 corresponding to the light transmission pattern LTP emits light having a center wavelength greater than about 450 nm and less than about 485 nm, the BT2020 color matching ratio of the display device DD may be greater than or equal to about 90%.

[0126] Therefore, according to the embodiment, the light conversion efficiency of the first color conversion pattern CCP1 and the second color conversion pattern CCP2 can be improved without reducing the color matching ratio of the display device DD. Therefore, the light efficiency and display quality of the display device DD can be improved.

[0127] Figure 5 is a plan view showing a display device according to an embodiment. Figure 6 is shown in Figure 5 a plan view of the light-emitting element layer in the display device of. Figure 7 is along Figure 5 a schematic cross-sectional view taken along line II-II' in. Figure 8 is along Figure 5 a schematic cross-sectional view taken along line III-III' in.

[0128] Hereinafter, a display device DD` according to an embodiment will be described with reference to Figures 5 to 8 .

[0129] Except for the combination of light-emitting elements defined for each of the light-emitting element groups, the display device DD` described with reference to Figures 5 to 8 may be substantially the same as the display device DD described with reference to Figures 1 to 4 . Therefore, overlapping descriptions will be omitted or simplified.

[0130] First, with reference to Figure 5 and Figure 6, the light-emitting element layer LEL` may include a light-emitting element LD. A set of light-emitting elements LD disposed in the first pixel region PXA1 among the light-emitting elements LD may be defined as a first light-emitting element group LDG1. A set of light-emitting elements LD disposed in the second pixel region PXA2 among the light-emitting elements LD may be defined as a second light-emitting element group LDG2`. A set of light-emitting elements LD disposed in the third pixel region PXA3 among the light-emitting elements LD may be defined as a third light-emitting element group LDG3`. For example, each of the first light-emitting element group LDG1, the second light-emitting element group LDG2`, and the third light-emitting element group LDG3` may include at least one light-emitting element.

[0131] In an embodiment, the first light-emitting element group LDG1 may be a set of first light-emitting elements LD1. In other words, the first light-emitting element LD1 may be disposed in the first pixel region PXA1. A detailed description of the first light-emitting element group LDG1 will be omitted because it overlaps with the description of the reference Figures 1 to 4 .

[0132] In an embodiment, each of the second light-emitting element group LDG2` and the third light-emitting element group LDG3` may be a combination of at least one of the second light-emitting elements LD2 and at least one of the third light-emitting elements LD3. For example, the second light-emitting element group LDG2` may be a combination of some of the second light-emitting elements LD2 and some of the third light-emitting elements LD3, and the third light-emitting element group LDG3` may be a combination of some other of the second light-emitting elements LD2 and some other of the third light-emitting elements LD3. For example, each of the second light-emitting element group LDG2` and the third light-emitting element group LDG3` may include at least one of the second light-emitting elements LD2 and at least one of the third light-emitting elements LD3.

[0133] In other words, in an embodiment, some of the second light-emitting elements LD2 may be disposed in the corresponding second pixel region PXA2, and some other of the second light-emitting elements LD2 may be disposed in the corresponding third pixel region PXA3. Some of the third light-emitting elements LD3 may be disposed in the corresponding second pixel region PXA2, and some other of the third light-emitting elements LD3 may be disposed in the corresponding third pixel region PXA3.

[0134] Figure 6 The planar arrangement of the light-emitting element LD shown in

[0135] is only an embodiment and can be variously changed according to the embodiment. Figure 7 and Figure 8, a circuit element layer CEL, a light-emitting element layer LEL`, and a light conversion layer LCL can be disposed on a substrate SUB. A detailed description of the substrate SUB, the circuit element layer CEL, and the light conversion layer LCL will be omitted because it overlaps with the description of reference Figures 1 to 4 and is not repeated here.

[0136] In an embodiment, a first light-emitting element LD1 can be disposed in an emission region EA of a first pixel region PXA1. Some of the second light-emitting elements LD2 can be disposed in the emission region EA of corresponding second pixel regions PXA2, and some of the second light-emitting elements LD2 can be disposed in the emission region EA of corresponding third pixel regions PXA3. Some of the third light-emitting elements LD3 can be disposed in the emission region EA of corresponding third pixel regions PXA3, and some of the third light-emitting elements LD3 can be disposed in the emission region EA of corresponding second pixel regions PXA2.

[0137] As described in reference Figures 1 to 4 , all of the first light-emitting elements LD1 can emit light of the same composition (e.g., center wavelength, color, etc.), all of the second light-emitting elements LD2 can emit light of the same composition, and all of the third light-emitting elements LD3 can emit light of the same composition.

[0138] In an embodiment, the center wavelength of the first light L1 emitted from the first light-emitting element LD1 can be greater than about 450 nm and less than about 485 nm. In an embodiment, the center wavelength of each of the second light L2 emitted from the second light-emitting element LD2 and the third light L3 emitted from the third light-emitting element LD3 can be less than or equal to about 450 nm.

[0139] For example, the center wavelength of the first light L1 emitted from the first light-emitting element LD1 can be in the range of about 460 nm to about 470 nm. For example, the center wavelength of the first light L1 emitted from the first light-emitting element LD1 can be in the range of about 465 nm to about 468 nm. For example, the center wavelength of each of the second light L2 emitted from the second light-emitting element LD2 and the third light L3 emitted from the third light-emitting element LD3 can be in the range of about 360 nm to about 450 nm. For example, the center wavelength of each of the second light L2 emitted from the second light-emitting element LD2 and the third light L3 emitted from the third light-emitting element LD3 can be in the range of about 400 nm to about 450 nm.

[0140] In the display device DD` according to an embodiment, the central wavelength of the second light L2 and the central wavelength of the third light L3 may be different from each other. For example, the central wavelength of the second light L2 may be shorter than the central wavelength of the third light L3. For example, the central wavelength of the third light L3 may be shorter than the central wavelength of the second light L2. For example, each of the second light-emitting element group LDG2` and the third light-emitting element group LDG3` may be a combination of light-emitting elements that emit light having different central wavelengths from each other.

[0141] In the display device DD` according to an embodiment, as Figure 7 shown, the first color conversion pattern CCP1 may convert the second light L2 emitted from the second light-emitting element LD2 that defines the second light-emitting element group LDG2` into green light Lg. As Figure 8 shown, the first color conversion pattern CCP1 may convert the third light L3 emitted from the third light-emitting element LD3 that defines the second light-emitting element group LDG2` into green light Lg.

[0142] As Figure 7 shown, the second color conversion pattern CCP2 may convert the third light L3 emitted from the third light-emitting element LD3 that defines the third light-emitting element group LDG3` into red light Lr. As Figure 8 shown, the second color conversion pattern CCP2 may convert the second light L2 emitted from the second light-emitting element LD2 that defines the third light-emitting element group LDG3` into red light Lr.

[0143] According to an embodiment, the display device DD` may include: a first light-emitting element group LDG1 including a first light-emitting element LD1 that emits first light L1 having a central wavelength greater than about 450 nm and less than about 485 nm; a second light-emitting element group LDG2`, which is a combination of a second light-emitting element LD2 that emits second light L2 having a central wavelength less than or equal to about 450 nm and a third light-emitting element LD3 that emits third light L3 having a central wavelength less than or equal to about 450 nm; and a third light-emitting element group LDG3`, which is a combination of a second light-emitting element LD2 that emits second light L2 having a central wavelength less than or equal to about 450 nm and a third light-emitting element LD3 that emits third light L3 having a central wavelength less than or equal to about 450 nm.

[0144] The display device DD` may include a light transmission pattern LTP that transmits the light emitted from the first light-emitting element group LDG1, a first color conversion pattern CCP1 that converts the light emitted from the second light-emitting element group LDG2`, and a second color conversion pattern CCP2 that converts the light emitted from the third light-emitting element group LDG3`.

[0145] Since the second light-emitting element group LDG2` corresponding to the first color conversion pattern CCP1 emits light having a central wavelength less than or equal to about 450 nm, the light conversion efficiency of the first color conversion pattern CCP1 with respect to the light emitted from the second light-emitting element group LDG2` can be improved.

[0146] Since the third light-emitting element group LDG3` corresponding to the second color conversion pattern CCP2 emits light having a central wavelength less than or equal to about 450 nm, the light conversion efficiency of the second color conversion pattern CCP2 with respect to the light emitted from the third light-emitting element group LDG3` can be improved.

[0147] Even when the central wavelength of the light emitted from the second light-emitting element group LDG2` and the central wavelength of the light emitted from the third light-emitting element group LDG3` are less than or equal to about 450 nm, since the first light-emitting element group LDG1 corresponding to the light transmission pattern LTP emits light having a central wavelength greater than about 450 nm and less than about 485 nm, the display device DD` can have an improved color matching rate.

[0148] Therefore, according to the embodiment, the light conversion efficiencies of the first color conversion pattern CCP1 and the second color conversion pattern CCP2 can be improved without reducing the color matching rate of the display device DD`. Therefore, the light efficiency and the display quality of the display device DD` can be improved.

[0149] Figure 9 is a plan view showing a display device according to an embodiment. Figure 10 is shown including in Figure 9 a plan view of the light-emitting element layer in the display device of. Figure 11 is along Figure 9 a schematic cross-sectional view taken along line IV-IV'.

[0150] Hereinafter, reference will be made to Figures 9 to 11 to describe the display device DD`` according to an embodiment.

[0151] In addition to including the light-emitting element layer LEL`` and the light conversion layer LCL`, the display device DD`` described with reference to Figures 9 to 11 can be substantially the same as the display device DD described with reference to Figures 1 to 4 Therefore, overlapping descriptions will be omitted or simplified.

[0152] First, with reference to Figure 9 and Figure 10 , the display device DD`` can include a light-emitting element layer LEL``. Except for including the light-emitting element LD` and not including the light-emitting element LD, the light-emitting element layer LEL`` can be the same as that described with reference to Figures 1 to 4The described light-emitting element layer LEL is substantially the same. Thus, overlapping descriptions will be omitted or simplified.

[0153] The light-emitting element layer LEL`` may include a light-emitting element LD`. The light-emitting element LD` may include a first light-emitting element LD1, a second light-emitting element LD2`, and a third light-emitting element LD3.

[0154] For example, except for including the second light-emitting element LD2` instead of the second light-emitting element LD2, the light-emitting element LD` may be substantially the same as the reference Figure 3 and Figure 4 described light-emitting element LD. Thus, detailed descriptions of the first light-emitting element LD1 and the third light-emitting element LD3 will be omitted because they overlap with the reference Figure 3 and Figure 4 descriptions.

[0155] In an embodiment, as shown in Figure 10 , the first light-emitting element group LDG1 may be a group of first light-emitting elements LD1, the second light-emitting element group LDG2`` may be a group of second light-emitting elements LD2`, and the third light-emitting element group LDG3 may be a group of third light-emitting elements LD3. In other words, in an embodiment, the first light-emitting element LD1 may be disposed in the first pixel region PXA1, the second light-emitting element LD2` may be disposed in the second pixel region PXA2, and the third light-emitting element LD3 may be disposed in the third pixel region PXA3. However, the present disclosure is not necessarily limited thereto.

[0156] Figure 10 The planar arrangement of the light-emitting element LD` shown in

[0157] is only an embodiment and can be variously changed according to the embodiment. Figure 11 Figures 1 to 4

[0158]

[0159] Further referring to

[0159] , the circuit element layer CEL, the light-emitting element layer LEL``, and the light conversion layer LCL` may be disposed on the substrate SUB. Detailed descriptions of the substrate SUB and the circuit element layer CEL will be omitted because they overlap with the reference Figures 1 to 4 descriptions.

[0158] In an embodiment, the second light-emitting element LD2` may be disposed in the emission region EA of the second pixel region PXA2. All of the second light-emitting elements LD2` may emit light of the same component (e.g., center wavelength, color, etc.).

[0159] In an embodiment, the second light-emitting element LD2` may emit second light L2` having a center wavelength greater than or equal to about 500 nm. For example, the second light-emitting element LD2` may emit green second light L2` having a center wavelength greater than or equal to about 500 nm. For example, the center wavelength of the second light L2` emitted from the second light-emitting element LD2` may be in the range of about 500 nm to about 600 nm. For example, the center wavelength of the second light L2` emitted from the second light-emitting element LD2` may be in the range of about 515 nm to about 560 nm. For example, the center wavelength of the second light L2` emitted from the second light-emitting element LD2` may be in the range of about 530 nm to about 540 nm.

[0160] For example, in the display device DD`` according to an embodiment, the first light-emitting element LD1 may emit blue first light L1 having a center wavelength greater than about 450 nm and less than about 485 nm, the second light-emitting element LD2` may emit green second light L2` having a center wavelength greater than or equal to about 500 nm, and the third light-emitting element LD3 may emit blue third light L3 having a center wavelength less than or equal to about 450 nm.

[0161] The light conversion layer LCL` may be disposed on the light-emitting element layer LEL``. In an embodiment, the light conversion layer LCL` may include a color conversion layer CCL`, a planarization layer PLN, and a color filter layer CFL. For example, except for including the color conversion layer CCL` and not including the color conversion layer CCL, the light conversion layer LCL` may be substantially the same as the light conversion layer LCL described in the reference Figure 3 and Figure 4 Therefore, overlapping descriptions will be omitted or simplified.

[0162] The color conversion layer CCL` may include a first light transmission pattern LTP1, a second light transmission pattern LTP2, a color conversion pattern CCP, and a bank BNK. A detailed description of the bank BNK will be omitted because it overlaps with the description in the reference Figure 4 description.

[0163] The first light transmission pattern LTP1 may have substantially the same structure as the light transmission pattern LTP described in the reference Figure 4 description. For example, in an embodiment, the first light transmission pattern LTP1 may include a first base resin BR1 and a first scatterer SCT1.

[0164] In an embodiment, the first light transmission pattern LTP1 may be disposed in the emission region EA of the first pixel region PXA1. Therefore, the first light transmission pattern LTP1 may overlap with the first light-emitting element group LDG1 in a plan view.

[0165] The first light transmission pattern LTP1 can transmit the first light L1 emitted from the first light-emitting element LD1 that defines the first light-emitting element group LDG1 without conversion. In other words, the first light transmission pattern LTP1 can emit blue light Lb having substantially the same components (e.g., center wavelength, color, etc.) as the first light L1 emitted from the first light-emitting element LD1.

[0166] The color conversion pattern CCP can have substantially the same structure as the second color conversion pattern CCP2 described in the reference Figure 4 For example, in an embodiment, the color conversion pattern CCP can include a third base resin BR3 and second color conversion particles QD2. The color conversion pattern CCP can also include a third scatterer SCT3.

[0167] In an embodiment, the color conversion pattern CCP can be disposed in the emission area EA of the third pixel area PXA3. Thus, the color conversion pattern CCP can overlap with the third light-emitting element group LDG3 in a plan view.

[0168] The color conversion pattern CCP can convert the third light L3 emitted from the third light-emitting element LD3 that defines the third light-emitting element group LDG3 into red light Lr. In other words, the color conversion pattern CCP can emit red light Lr having components (e.g., center wavelength, color, etc.) different from those of the third light L3 emitted from the third light-emitting element LD3.

[0169] The second light transmission pattern LTP2 can be disposed in the second pixel area PXA2. Specifically, the second light transmission pattern LTP2 can be disposed in the emission area EA of the second pixel area PXA2. Thus, the second light transmission pattern LTP2 can overlap with the second light-emitting element group LDG2`` in a plan view. For example, the light emitted from the second light-emitting element group LDG2`` can be incident on the second light transmission pattern LTP2. For example, the second light L2` emitted from the second light-emitting element LD2` that defines the second light-emitting element group LDG2`` can be incident on the second light transmission pattern LTP2.

[0170] The second light transmission pattern LTP2 can transmit the light emitted from the second light-emitting element group LDG2``. In other words, the second light transmission pattern LTP2 can emit light having substantially the same components (e.g., center wavelength, color, etc.) as the light emitted from the second light-emitting element group LDG2``.

[0171] For example, the second light transmission pattern LTP2 can transmit the second light L2' without converting the second light L2' emitted from the second light-emitting element LD2' that defines the second light-emitting element group LDG2''. In other words, the second light transmission pattern LTP2 can emit green light Lg having substantially the same components (e.g., center wavelength, color, etc.) as the green second light L2' emitted from the second light-emitting element LD2'.

[0172] In an embodiment, the second light transmission pattern LTP2 can include a second base resin BR2 and a second scatterer SCT2. A detailed description of the second base resin BR2 and the second scatterer SCT2 will be omitted because it overlaps with the description of the reference Figure 4 description.

[0173] According to an embodiment, the display device DD'' can include a first light-emitting element group LDG1 and a third light-emitting element group LDG3. The first light-emitting element group LDG1 includes a first light-emitting element LD1 that emits first light L1 having a center wavelength greater than about 450 nm and less than about 485 nm. The third light-emitting element group LDG3 includes a third light-emitting element LD3 that emits third light L3 having a center wavelength less than or equal to about 450 nm. The display device DD'' can include a color conversion pattern CCP that converts the light emitted from the third light-emitting element group LDG3.

[0174] Since the third light-emitting element group LDG3 corresponding to the color conversion pattern CCP emits light having a center wavelength less than or equal to about 450 nm, the light conversion efficiency of the color conversion pattern CCP with respect to the light emitted from the third light-emitting element group LDG3 can be improved.

[0175] Even when the center wavelength of the light emitted from the third light-emitting element group LDG3 is less than or equal to about 450 nm, since the first light-emitting element group LDG1 corresponding to the first light transmission pattern LTP1 emits light having a center wavelength greater than about 450 nm and less than about 485 nm, the display device DD'' can have an improved color matching rate.

[0176] Therefore, according to an embodiment, the light conversion efficiency of the color conversion pattern CCP can be improved without reducing the color matching rate of the display device DD''. Therefore, the light efficiency and display quality of the display device DD'' can be improved.

[0177] The display device DD'' can further include a second light-emitting element group LDG2'' that includes a second light-emitting element LD2' that emits second light L2' having a center wavelength greater than or equal to about 500 nm, and a second light transmission pattern LTP2 that transmits the light emitted from the second light-emitting element group LDG2''.

[0178] Therefore, even when the center wavelength of the light emitted from the third light-emitting element group LDG3 is less than or equal to about 450 nm, since the second light-emitting element group LDG2 corresponding to the second light-transmitting pattern LTP2 emits light having a center wavelength of greater than or equal to about 500 nm, the display device DD`` can have a further improved color matching rate. Accordingly, the light efficiency and display quality of the display device DD`` can be further improved.

[0179] Figure 12 is a plan view showing a display device according to an embodiment. Figure 13 is shown in Figure 12 a plan view of a light-emitting element layer included in the display device of Figure 14 is a schematic cross-sectional view taken along line V-V' of Figure 12

[0180] Hereinafter, a display device DD``` according to an embodiment will be described with reference to Figures 12 to 14

[0181] In addition to including a light-emitting element layer LEL``` and a light conversion layer LCL``, the display device DD``` described with reference to Figures 12 to 14 can be substantially the same as the display device DD described with reference to Figures 1 to 4 Accordingly, overlapping descriptions will be omitted or simplified.

[0182] First, with reference to Figure 12 and Figure 13 the display device DD``` can include a light-emitting element layer LEL```. In addition to including a light-emitting element LD`` and not including a light-emitting element LD, the light-emitting element layer LEL``` can be substantially the same as the light-emitting element layer LEL described with reference to Figures 1 to 4 Accordingly, overlapping descriptions will be omitted or simplified.

[0183] The light-emitting element layer LEL``` can include a light-emitting element LD``. The light-emitting element LD`` can include a first light-emitting element LD1, a second light-emitting element LD2, and a third light-emitting element LD3`.

[0184] For example, in addition to including a third light-emitting element LD3` and not including a third light-emitting element LD3, the light-emitting element LD`` can be substantially the same as the light-emitting element LD described with reference to Figure 3 and Figure 4 Accordingly, detailed descriptions of the first light-emitting element LD1 and the second light-emitting element LD2 will be omitted since they overlap with the descriptions of Figure 3 and Figure 4

[0185] In an embodiment, as Figure 13 ​​​As shown, the first light-emitting element group LDG1 may be a group of first light-emitting elements LD1, the second light-emitting element group LDG2 may be a group of second light-emitting elements LD2, and the third light-emitting element group LDG3 may be a group of third light-emitting elements LD3`. In other words, in an embodiment, the first light-emitting element LD1 may be disposed in the first pixel region PXA1, the second light-emitting element LD2 may be disposed in the second pixel region PXA2, and the third light-emitting element LD3` may be disposed in the third pixel region PXA3. However, the present disclosure is not necessarily limited thereto.

[0186] Figure 13 The planar arrangement of the light-emitting elements LD shown is merely an embodiment and may be variously changed according to the embodiment.

[0187] Further referring to Figure 14 , the circuit element layer CEL, the light-emitting element layer LEL```, and the light conversion layer LCL`` may be disposed on the substrate SUB. A detailed description of the substrate SUB and the circuit element layer CEL will be omitted because it overlaps with the description of Figures 1 to 4 .

[0188] In an embodiment, the third light-emitting element LD3` may be disposed in the emission region EA of the third pixel region PXA3. All of the third light-emitting elements LD3` may emit light of the same composition (e.g., center wavelength, color, etc.).

[0189] In an embodiment, the third light-emitting element LD3` may emit third light L3` having a center wavelength greater than or equal to about 500 nm. For example, the third light-emitting element LD3` may emit red third light L3` having a center wavelength greater than or equal to about 500 nm. For example, the center wavelength of the third light L3` emitted from the third light-emitting element LD3` may be in the range of about 600 nm to about 780 nm. For example, the center wavelength of the third light L3` emitted from the third light-emitting element LD3` may be in the range of about 630 nm to about 700 nm.

[0190] For example, in a display device DD``` according to an embodiment, the first light-emitting element LD1 may emit blue first light L1 having a center wavelength greater than about 450 nm and less than about 485 nm, the second light-emitting element LD2 may emit blue second light L2 having a center wavelength less than or equal to about 450 nm, and the third light-emitting element LD3` may emit red third light L3` having a center wavelength greater than or equal to about 500 nm.

[0191] The light conversion layer LCL`` can be disposed on the light-emitting element layer LEL```. In an embodiment, the light conversion layer LCL`` can include a color conversion layer CCL``, a planarization layer PLN, and a color filter layer CFL. For example, in addition to including the color conversion layer CCL`` and not including the color conversion layer CCL, the light conversion layer LCL`` can be substantially the same as the light conversion layer LCL described in the reference Figure 3 and Figure 4 . Therefore, overlapping descriptions will be omitted or simplified.

[0192] The color conversion layer CCL`` can include a first light transmission pattern LTP1, a color conversion pattern CCP`, a third light transmission pattern LTP3, and a bank BNK. A detailed description of the bank BNK will be omitted because it overlaps with the description in the reference Figure 4 .

[0193] The first light transmission pattern LTP1 and the light transmission pattern LTP described in the reference Figure 4 can have substantially the same structure. For example, in an embodiment, the first light transmission pattern LTP1 can include a first base resin BR1 and a first scatterer SCT1.

[0194] In an embodiment, the first light transmission pattern LTP1 can be disposed in the emission region EA of the first pixel region PXA1. Therefore, the first light transmission pattern LTP1 can overlap with the first light-emitting element group LDG1 in a plan view.

[0195] The first light transmission pattern LTP1 can transmit the first light L1 emitted from the first light-emitting element LD1 that defines the first light-emitting element group LDG1 without conversion. In other words, the first light transmission pattern LTP1 can emit blue light Lb having substantially the same components (e.g., center wavelength, color, etc.) as the first light L1 emitted from the first light-emitting element LD1.

[0196] The color conversion pattern CCP` and the first color conversion pattern CCP1 described in the reference Figure 4 can have substantially the same structure. For example, in an embodiment, the color conversion pattern CCP` can include a second base resin BR2 and a first color conversion particle QD1. The color conversion pattern CCP` can further include a second scatterer SCT2.

[0197] In an embodiment, the color conversion pattern CCP` can be disposed in the emission region EA of the second pixel region PXA2. Therefore, the color conversion pattern CCP` can overlap with the second light-emitting element group LDG2 in a plan view.

[0198] The color conversion pattern CCP` can convert the second light L2, which is blue and emitted from the second light-emitting element LD2 that defines the second light-emitting element group LDG2, into the green light Lg. In other words, the color conversion pattern CCP` can emit the green light Lg having a different component (e.g., center wavelength, color, etc.) from the second light L2 emitted from the second light-emitting element LD2.

[0199] The third light transmission pattern LTP3 can be disposed in the third pixel region PXA3. Specifically, the third light transmission pattern LTP3 can be disposed in the emission region EA of the third pixel region PXA3. Thus, the third light transmission pattern LTP3 can overlap with the third light-emitting element group LDG3`` in the plan view. For example, the light emitted from the third light-emitting element group LDG3`` can be incident on the third light transmission pattern LTP3. For example, the third light L3` emitted from the third light-emitting element LD3` that defines the third light-emitting element group LDG3`` can be incident on the third light transmission pattern LTP3.

[0200] The third light transmission pattern LTP3 can transmit the light emitted from the third light-emitting element group LDG3``. In other words, the third light transmission pattern LTP3 can emit light having substantially the same component (e.g., center wavelength, color, etc.) as the light emitted from the third light-emitting element group LDG3``.

[0201] For example, the third light transmission pattern LTP3 can transmit the third light L3` without converting the third light L3` emitted from the third light-emitting element LD3` that defines the third light-emitting element group LDG3``. In other words, the third light transmission pattern LTP3 can emit the red light Lr having substantially the same component (e.g., center wavelength, color, etc.) as the third light L3` emitted from the third light-emitting element LD3`.

[0202] In an embodiment, the third light transmission pattern LTP3 can include a third base resin BR3 and a third scatterer SCT3. The detailed description of the third base resin BR3 and the third scatterer SCT3 will be omitted because it overlaps with the description of the reference Figure 4 description.

[0203] According to an embodiment, the display device DD``` can include a first light-emitting element group LDG1 and a second light-emitting element group LDG2. The first light-emitting element group LDG1 includes a first light-emitting element LD1 that emits a first light L1 having a center wavelength greater than about 450 nm and less than about 485 nm. The second light-emitting element group LDG2 includes a second light-emitting element LD2 that emits a second light L2 having a center wavelength less than or equal to about 450 nm. The display device DD``` can include a color conversion pattern CCP` that converts the light emitted from the second light-emitting element group LDG2.

[0204] Since the second light-emitting element group LDG2 corresponding to the color conversion pattern CCP` emits light having a central wavelength less than or equal to about 450 nm, the light conversion efficiency of the color conversion pattern CCP` with respect to the light emitted from the second light-emitting element group LDG2 can be improved.

[0205] Even when the central wavelength of the light emitted from the second light-emitting element group LDG2 is less than or equal to about 450 nm, since the first light-emitting element group LDG1 corresponding to the first light-transmitting pattern LTP1 emits light having a central wavelength greater than about 450 nm and less than about 485 nm, the display device DD``` can have an improved color matching rate.

[0206] Therefore, according to the embodiment, the light conversion efficiency of the color conversion pattern CCP` can be improved without reducing the color matching rate of the display device DD```. Therefore, the light efficiency and display quality of the display device DD``` can be improved.

[0207] The display device DD``` may further include a third light-emitting element group LDG3`` including a third light-emitting element LD3` that emits a third light L3` having a central wavelength greater than or equal to about 500 nm, and a third light-transmitting pattern LTP3 that transmits the light emitted from the third light-emitting element group LDG3``.

[0208] Therefore, even when the central wavelength of the light emitted from the second light-emitting element group LDG2 is less than or equal to about 450 nm, since the third light-emitting element group LDG3`` corresponding to the third light-transmitting pattern LTP3 emits light having a central wavelength greater than or equal to about 500 nm, the display device DD``` can have a further improved color matching rate. Therefore, the light efficiency and display quality of the display device DD``` can be further improved.

[0209] Hereinafter, the effects of the present disclosure will be described with reference to experimental examples and comparative examples. The examples shown below are only examples for helping to understand the present disclosure, and the scope of the present disclosure is not limited thereto.

[0210] [Experimental Example 1, Experimental Example 2, Experimental Example 3, Comparative Example 1, Comparative Example 2]

[0211] In Experimental Examples 1 to 3 and Comparative Examples 1 to 2, the manufacturing examples and evaluation methods are as follows.

[0212] 1. Manufacturing Example

[0213] 1) Preparation of Quantum Dot Composition

[0214] A dispersant and an initiator were added to a propylene glycol methyl ether acetate (PGMEA) solution in which about 40 wt% of quantum dots that absorb blue light and emit green light were dispersed, and stirred for more than 24 hours to obtain a quantum dot composition.

[0215] 2) Preparation of the color conversion pattern

[0216] The obtained quantum dot composition was spin-coated on a glass substrate to obtain a film. The obtained film was irradiated with ultraviolet light using an exposure machine and baked at 180 °C for 30 minutes to obtain a color conversion pattern with a thickness of 10 μm that can convert blue light into green light.

[0217] 2. Evaluation method of the light conversion efficiency

[0218] 1) Experimental example 1

[0219] Blue light with a central wavelength of 430 nm was incident on the fabricated color conversion pattern, and the light conversion efficiency was measured using a QE-2000 (Otsuka) device. The light conversion efficiency (power conversion efficiency, PCE) was calculated by Equation 1 below.

[0220] [Equation 1]

[0221] PCE = (A2 / A1) × 100

[0222] In Equation 1, A1 refers to the area of the blue light absorption spectrum, and A2 refers to the area of the emission spectrum for the converted light. For example, A1 can correspond to the absorption peak area of the blue light absorbed by the quantum dots. A2 can correspond to the emission peak area of the light converted by the quantum dots.

[0223] 2) Experimental example 2

[0224] The light conversion efficiency was evaluated in the same manner as in Experimental Example 1, except that blue light with a central wavelength of 440 nm was incident on the color conversion pattern.

[0225] 3) Experimental example 3

[0226] The light conversion efficiency was evaluated in the same manner as in Experimental Example 1, except that blue light with a central wavelength of 450 nm was incident on the color conversion pattern.

[0227] 4) Comparative example 1

[0228] The light conversion efficiency was evaluated in the same manner as in Experimental Example 1, except that blue light with a central wavelength of 460 nm was incident on the color conversion pattern.

[0229] 5) Comparative example 2

[0230] The light conversion efficiency was evaluated in the same manner as in Experimental Example 1, except that blue light with a central wavelength of 467 nm was incident on the color conversion pattern.

[0231] Table 1 below shows the light conversion efficiency of the color conversion pattern measured according to Experimental Examples 1 to 3 and Comparative Examples 1 to 2.

[0232] [Table 1]

[0233]

[0234] Referring to Table 1, for Experimental Examples 1 to 3 where blue light with a central wavelength of 450 nm or less was incident on the color conversion pattern, the light conversion efficiency was greater than 30%, confirming that the light conversion efficiency of the color conversion pattern was excellent. On the other hand, for Comparative Examples 1 and 2 where blue light with a central wavelength exceeding 450 nm was incident on the color conversion pattern, the light conversion efficiency was less than 30%, confirming that the light conversion efficiency of the color conversion pattern decreased compared to the experimental examples.

[0235] [Experimental Examples 4, 5, 6, Comparative Examples 3, 4]

[0236] In Experimental Examples 4 to 6 and Comparative Examples 3 to 4, the manufacturing examples and evaluation methods were as follows.

[0237] 1. Manufacturing Example

[0238] 1) Preparation of quantum dot composition

[0239] A dispersant and an initiator were added to a propylene glycol methyl ether acetate (PGMEA) solution in which about 40 wt% of quantum dots that absorb blue light and emit green light were dispersed, and stirred for more than 24 hours to obtain a quantum dot composition.

[0240] 2) Preparation of color conversion pattern

[0241] The obtained quantum dot composition was spin-coated on a glass substrate to obtain a film. The obtained film was irradiated with ultraviolet light using an exposure machine and baked at 180 °C for 30 minutes to obtain a color conversion pattern with a thickness of 10 microns that can convert blue light into red light.

[0242] 2. Evaluation method of light conversion efficiency

[0243] 1) Experimental Example 4

[0244] Blue light with a central wavelength of 430 nm was incident on the manufactured color conversion pattern, and the light conversion efficiency was measured using a QE-2000 (Otsuka) device. The light conversion efficiency (power conversion efficiency, PCE) was calculated by Equation 1 above.

[0245] 2) Experimental Example 5

[0246] The light conversion efficiency was evaluated in the same manner as in Experimental Example 4, except that blue light with a central wavelength of 440 nm was incident on the color conversion pattern.

[0247] 3) Experimental Example 6

[0248] The light conversion efficiency was evaluated in the same manner as in Experimental Example 4, except that blue light with a central wavelength of 450 nm was incident on the color conversion pattern.

[0249] 4) Comparative Example 3

[0250] The light conversion efficiency was evaluated in the same manner as in Experimental Example 4, except that blue light with a central wavelength of 460 nm was incident on the color conversion pattern.

[0251] 5) Comparative Example 4

[0252] The light conversion efficiency was evaluated in the same manner as in Experimental Example 4, except that blue light with a central wavelength of 467 nm was incident on the color conversion pattern.

[0253] Table 2 below shows the light conversion efficiency of the color conversion pattern measured according to Experimental Examples 4 to 6 and Comparative Examples 3 to 4.

[0254] [Table 2]

[0255]

[0256] Referring to Table 2, according to Experimental Examples 4 to 6 where blue light with a central wavelength of 450 nm or less was incident on the color conversion pattern, the light conversion efficiency was greater than 35%, confirming that the light conversion efficiency of the color conversion pattern was excellent. On the other hand, according to Comparative Examples 3 and 4 where blue light with a central wavelength exceeding 450 nm was incident on the color conversion pattern, the light conversion efficiency was less than 35%, confirming that the light conversion efficiency of the color conversion pattern decreased compared with the experimental examples.

[0257] [Experimental Examples 7, 8, Comparative Examples 5, 6]

[0258] In Experimental Examples 7 to 8 and Comparative Examples 5 to 6, the display device was manufactured under the same conditions except for the central wavelength of the blue light emitted from the light-emitting element corresponding to the first pixel region that emits blue light. In each of Experimental Examples 7 to 8 and Comparative Examples 5 to 6, the central wavelengths of the light emitted from the light-emitting elements corresponding to the first pixel region that emits blue light, the second pixel region that emits green light, and the third pixel region that emits red light are shown in Table 3 below.

[0259] In Table 3, the color matching rate was evaluated based on the BT2020 color gamut.

[0260] [Table 3]

[0261]

[0262] Referring to Table 3, according to Experimental Examples 7 and 8 in which the light-emitting elements provided in the first pixel region emitting blue light emit blue light having a central wavelength greater than 450 nm and less than 485 nm, even when the light-emitting elements provided in the second pixel region emitting green light and the third pixel region emitting red light emit blue light having a central wavelength of 450 nm or less, the color matching rate of the display device is greater than 90%, confirming that the color matching rate of the display device is excellent. On the other hand, according to Comparative Examples 5 and 6 in which the light-emitting elements provided in the first pixel region emitting blue light emit blue light having a central wavelength of 450 nm or less, when the light-emitting elements provided in the second pixel region emitting green light and the third pixel region emitting red light emit blue light having a central wavelength of 450 nm or less, the color matching rate of the display device is less than 90%, confirming that the color matching rate of the display device is reduced compared with the experimental examples.

[0263] The above description is an example of the technical features of the present disclosure, and those skilled in the art to which the present disclosure pertains will be able to make various modifications and changes. Therefore, the embodiments of the present disclosure described above can be implemented alone or in combination with each other.

[0264] Therefore, the embodiments disclosed in the present disclosure are not intended to limit the technical spirit of the present disclosure, but are intended to describe the technical spirit of the present disclosure, and the scope of the technical spirit of the present disclosure is not limited by these embodiments. The protection scope of the present disclosure should be interpreted by the appended claims, and it should be understood that all technical spirits within the equivalent scope are included in the scope of the present disclosure.

Claims

1. A display device, characterized in that, Comprising: A first light-emitting element group including at least one first light-emitting element that emits first light having a central wavelength greater than 450 nm and less than 485 nm; A second light-emitting element group including at least one second light-emitting element that emits second light having a central wavelength less than or equal to 450 nm; A third light-emitting element group including at least one third light-emitting element that emits third light having a central wavelength less than or equal to 450 nm; And A color conversion layer disposed on the first light-emitting element group, the second light-emitting element group, and the third light-emitting element group, and including a first color conversion pattern that converts light emitted from the second light-emitting element group and a second color conversion pattern that converts light emitted from the third light-emitting element group.

2. The display device according to claim 1, wherein The color conversion layer further includes a light transmission pattern that transmits light emitted from the first light-emitting element group, The light transmission pattern overlaps with the first light-emitting element group in a plan view, The first color conversion pattern overlaps with the second light-emitting element group in the plan view, The second color conversion pattern overlaps with the third light-emitting element group in the plan view, The light transmission pattern includes a first scatterer, and Each of the first color conversion pattern and the second color conversion pattern includes quantum dots and a second scatterer.

3. The display device according to claim 1, wherein The first color conversion pattern converts the light emitted from the second light-emitting element group into green light, The second color conversion pattern converts the light emitted from the third light-emitting element group into red light, The light conversion efficiency of the first color conversion pattern with respect to the light emitted from the second light-emitting element group is greater than or equal to 30%, and The light conversion efficiency of the second color conversion pattern with respect to the light emitted from the third light-emitting element group is greater than or equal to 35%.

4. The display device according to claim 1, wherein The central wavelength of the first light emitted by the at least one first light-emitting element is in the range of 460 nm to 470 nm.

5. The display device according to claim 1, characterized in that The color matching rate of the display device is greater than or equal to 90%.

6. The display device according to claim 1, wherein, Each of the at least one first light-emitting element, the at least one second light-emitting element, and the at least one third light-emitting element is an ultra-small light-emitting element.

7. A display device, characterized in that, Comprising: A first light-emitting element group including at least one first light-emitting element that emits first light having a central wavelength greater than 450 nm and less than 485 nm; A second light-emitting element group including at least one second light-emitting element that emits second light having a central wavelength greater than or equal to 500 nm; A third light-emitting element group including at least one third light-emitting element that emits third light having a central wavelength less than or equal to 450 nm; And A color conversion layer disposed on the first light-emitting element group, the second light-emitting element group, and the third light-emitting element group, and including a color conversion pattern that converts light emitted from the third light-emitting element group.

8. The display device according to claim 7, wherein The color conversion layer further includes: a first light transmission pattern that transmits light emitted from the first light-emitting element group; and a second light transmission pattern that transmits light emitted from the second light-emitting element group, wherein the first light transmission pattern overlaps with the first light-emitting element group in a plan view, the second light transmission pattern overlaps with the second light-emitting element group in the plan view, the color conversion pattern overlaps with the third light-emitting element group in the plan view, and each of the first light transmission pattern and the second light transmission pattern includes a first scatterer, and the color conversion pattern includes quantum dots and a second scatterer.

9. The display device according to claim 7, wherein The central wavelength of the first light emitted from the at least one first light-emitting element is in the range of 460 nm to 470 nm.

10. The display device according to claim 7, wherein, The color matching rate of the display device is greater than or equal to 90%.

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