Display device

Abstract

The display device includes a first light-emitting element that overlaps with a first light-emitting region and emits first-color light, a first wavelength-conversion pattern that overlaps with the first light-emitting element and converts the wavelength of the first-color light into second-color light, and a first color filter that overlaps with the first wavelength-conversion pattern and includes a first light-absorbing colorant and a colorant of the second color, wherein the colorant of the second color blocks the transmission of the first-color light and transmits the second-color light, wherein the colorant of the second color transmits light within a first overlapping wavelength range, within which the first emission spectrum of the first wavelength-conversion pattern overlaps with the first light-absorption spectrum of the first wavelength-conversion pattern, and wherein the first light-absorbing colorant absorbs light within the first overlapping wavelength range.

Description

[0001] Cross - reference to related applications

[0002] This application claims priority and the benefits arising therefrom to Korean Patent Application No. 10 - 2020 - 0082217, filed on July 3, 2020, the disclosure of which is incorporated herein by reference in its entirety. Technical field

[0003] Embodiments of the present invention relate to a display device. Background art

[0004] With the development of multimedia, display devices have become increasingly important. Accordingly, various display devices, such as liquid crystal display devices and organic light - emitting diode display devices, are being developed.

[0005] In a display device, a self - emissive display device includes self - emissive elements, such as organic light - emitting diodes. The self - emissive element may include two electrodes facing each other and a light - emitting layer interposed between the two electrodes. When the self - emissive element is an organic light - emitting diode, electrons and holes provided from the two electrodes may recombine in the light - emitting layer to generate excitons. When the generated excitons change from an excited state to a ground state, light may be emitted.

[0006] Since self - emissive display devices do not require a light source such as a backlight unit, they can consume low power, be made lightweight and thin, and have a wide viewing angle, high brightness and contrast, and a fast response speed. Due to these high - quality characteristics, self - emissive display devices are attracting attention as next - generation display devices.

[0007] As a way to make each pixel of a display device uniquely display one primary color, a color conversion pattern or a wavelength conversion pattern may be placed in each pixel on the optical path extending from a light source to an observer. Summary of the invention

[0008] Features of the present invention provide a display device having improved display quality.

[0009] However, the features of the present invention are not limited to the features set forth herein. By referring to the following specific embodiments of the present disclosure, the above and other features of the present invention will become apparent to those of ordinary skill in the art to which the present disclosure pertains.

[0010] Embodiments of a display device include a substrate, a first light-emitting element, a first wavelength conversion pattern, and a first color filter, wherein: the substrate includes a first light-emitting region; the first light-emitting element is disposed on the substrate, overlapping the first light-emitting region and emitting light of a first color; the first wavelength conversion pattern is disposed on the first light-emitting element, overlapping the first light-emitting element and wavelength-converting the light of the first color into light of a second color; the first color filter is disposed on the first wavelength conversion pattern, overlapping the first wavelength conversion pattern, and includes a first light-absorbing colorant and a colorant of the second color, wherein the colorant of the second color blocks the transmission of the light of the first color and transmits the light of the second color, wherein the colorant of the second color transmits light within a first overlapping wavelength range, within which the first emission spectrum of the first wavelength conversion pattern overlaps the first light absorption spectrum of the first wavelength conversion pattern, and wherein the first light-absorbing colorant absorbs the light within the first overlapping wavelength range.

[0011] Embodiments of a display device include a substrate, a first light-emitting element, a first wavelength conversion pattern, a first color filter, and a first light-absorbing layer, wherein: the substrate includes a first light-emitting region; the first light-emitting element is disposed on the substrate, overlapping the first light-emitting region and emitting light of a first color; the first wavelength conversion pattern is disposed on the first light-emitting element, overlapping the first light-emitting element, and the first wavelength conversion pattern includes a first wavelength shifter that wavelength-converts the light of the first color into light of a second color; the first color filter is disposed on the first wavelength conversion pattern, overlapping the first wavelength conversion pattern, and includes a colorant of the second color, the colorant of the second color blocking the transmission of the light of the first color and transmitting the light of the second color; the first light-absorbing layer is disposed on the first wavelength conversion pattern, overlapping the first color filter, and includes a first light-absorbing colorant, wherein the colorant of the second color transmits light within a first overlapping wavelength range, within which the first emission spectrum of the first wavelength conversion pattern overlaps the first light absorption spectrum of the first wavelength conversion pattern, and wherein the first light-absorbing colorant absorbs the light within the first overlapping wavelength range. Description of the Drawings

[0012] These and / or other embodiments, features, and advantages will become apparent and more readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0013] Figure 1 is a perspective view of an embodiment of a display device;

[0014] Figure 2 is along Figure 1 a schematic cross-sectional view of the display device taken along line Xa-Xa' of;

[0015] Figure 3 is Figure 1 andFigure 2 A schematic plan view of the display substrate shown in the display area of the display device;

[0016] Figure 4 is Figure 1 and Figure 2 A schematic plan view of the color conversion substrate shown in the display area of the display device;

[0017] Figure 5 is a cross-sectional view of an embodiment of the display device taken along the line X1-X1' of Figure 3 and Figure 4 ;

[0018] Figure 6 is Figure 5 An enlarged cross-sectional view of part Q1 of

[0019] Figure 7 is Figure 5 An enlarged cross-sectional view of part Q2 of

[0020] Figure 8 is Figure 5 An enlarged cross-sectional view of part Q3 of

[0021] Figure 9 is Figure 5 An enlarged cross-sectional view of part Q4 of

[0022] Figure 10 A plan view of an embodiment showing a schematic arrangement of a third color filter and a color pattern in the color conversion substrate of the display device;

[0023] Figure 11 A plan view of an embodiment showing a schematic arrangement of a light blocking member in the color conversion substrate of the display device;

[0024] Figure 12 A plan view of an embodiment showing a schematic arrangement of a first color filter and a second color filter in the color conversion substrate of the display device;

[0025] Figure 13 A plan view of an embodiment showing a schematic arrangement of a first wavelength conversion pattern, a second wavelength conversion pattern, and a light transmissive pattern in the color conversion substrate of the display device;

[0026] Figure 14 Shows the light transmission spectrum of the colorant of the second color included in the first color filter shown in Figure 5 ;

[0027] Figure 15 Shows Figure 5 The light absorption spectrum and emission spectrum of the first wavelength conversion pattern shown in

[0028] Figure 16 shows an embodiment of the light absorption spectrum of the first light absorption colorant included in the first color filter shown in Figure 5 ;

[0029] Figure 17 shows an embodiment of the light absorption spectrum of the first light absorption colorant included in the first color filter shown in Figure 5 ;

[0030] Figure 18 is a view for explaining an embodiment of the function of the first light absorption colorant in a display device;

[0031] Figure 19 is a cross-sectional view of an embodiment of a display device taken along the line X1-X1' of Figure 3 and Figure 4 ;

[0032] Figure 20 [[ID=z6]]is Figure 19 an enlarged cross-sectional view of part Q5 of

[0033] Figure 21 is Figure 19 an enlarged cross-sectional view of part Q6 of

[0034] Figure 22 shows Figure 19 the light transmission spectrum of the colorant of the third color included in the second color filter shown in

[0035] Figure 23 shows Figure 19 the light absorption spectrum and emission spectrum of the second wavelength conversion pattern shown in

[0036] Figure 24 shows Figure 19 an embodiment of the light absorption spectrum of the second light absorption colorant included in the second color filter shown in

[0037] Figure 25 shows Figure 19 an embodiment of the light absorption spectrum of the second light absorption colorant included in the second color filter shown in

[0038] Figure 26 is for explaining Figure 19 an embodiment of the function of the second light absorption colorant in a display device of

[0039] Figure 27 is a cross-sectional view of an embodiment of a display device taken along the line X1-X1' of Figure 3 and Figure 4 ;

[0040] Figure 28 is a view showing an embodiment of the functions of a first light-absorbing colorant and a second light-absorbing colorant in a display device for explanation; Figure 27 ;

[0041] Figure 29 is a cross-sectional view of an embodiment of the display device taken along line X1-X1' of Figure 3 and Figure 4 ;

[0042] Figure 30 is Figure 29 an enlarged cross-sectional view of part R1 of

[0043] Figures 31 to 34 are respectively cross-sectional views of an embodiment of the display device taken along line X1-X1' of Figure 3 and Figure 4 ;

[0044] Figure 35 is Figure 34 an enlarged cross-sectional view of part R2 of

[0045] Figures 36 to 40 are respectively cross-sectional views of an embodiment of the display device taken along line X1-X1' of Figure 3 and Figure 4 ; DETAILED DESCRIPTION

[0046] Embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. However, the present invention may be embodied in 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 invention to those skilled in the art. Throughout the specification, the same reference numerals denote the same components. In the drawings, the thicknesses of layers and regions are exaggerated for clarity.

[0047] The terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the inventive concept. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms as well. It should also be understood that when used in this specification, the terms "comprises" and / or "comprising" specify the presence of the stated features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0048] It should also be understood that when a layer is referred to as being “on” another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may also be present. In contrast, when an element is referred to as being “directly on” another element, no intervening elements are present.

[0049] For ease of description, spatial relative terms such as “beneath,” “below,” “lower,” “above,” “on,” “upper,” etc. may be used herein to describe the relationship of one element or feature to another (or other) element or feature as shown in the figures. It should be understood that, in addition to the orientation depicted in the figures, spatial relative terms are intended to also encompass different orientations of the device during use or operation. For example, if the device in the figures is flipped, an element described as “beneath” or “below” other elements or features will then be oriented “above” the other elements or features. Thus, the exemplary term “beneath” can encompass both an orientation above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations), and the spatial relative descriptors used herein should be interpreted accordingly.

[0050] As used herein, “about” or “approximately” includes the stated value and means within an acceptable deviation range of the particular value as determined by one of ordinary skill in the art in view of the measurements discussed and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, “about” can mean within one or more standard deviations, or within ±30%, ±20%, ±10%, ±5% of the stated value.

[0051] It should be understood that although the terms first, second, etc. may be used herein to describe various elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer, or section from another. Thus, without departing from the teachings of the inventive concept, a first element, first component, first region, first layer, or first section discussed below may be referred to as a second element, second component, second region, second layer, or second section.

[0052] Embodiments are described herein with reference to plan views and cross-sectional views that are schematic illustrations of idealized embodiments of the present disclosure. As such, variations in the shapes of the illustrations due to, for example, manufacturing techniques and / or tolerances are to be expected. Thus, embodiments of the present disclosure should not be construed as limited to the particular shapes of the regions shown herein, but should include deviations in shapes due to, for example, manufacturing. Accordingly, the regions shown in the figures are schematic in nature, and their shapes are not intended to show the actual shape of the regions of the device and are not intended to limit the scope of the invention.

[0053] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0054] Figure 1 is a schematic perspective view of an embodiment of the display device 1. Figure 2 is along Figure 1 A schematic cross-sectional view of the display device 1 taken along the line Xa-Xa' of.

[0055] Referring to Figure 1 and Figure 2 , the display device 1 can be applied to various electronic devices, including small and medium-sized electronic devices (such as, tablet personal computers ("PCs"), smart phones, car navigation units, cameras, central information displays ("CIDs") provided in cars, wristwatch-type electronic devices, personal digital assistants ("PDAs"), portable multimedia players ("PMPs") and game consoles) and large and medium-sized electronic devices (such as, televisions, external billboards, monitors, PCs and laptop computers). However, these are merely examples, and obviously, without departing from the concept of the present invention, the display device 1 can also be adopted in other electronic devices.

[0056] In some embodiments, the display device 1 can be quadrilateral (e.g., rectangular) in a plan view. The display device 1 can include two first sides extending in a first direction D1 and two second sides extending in a second direction D2 intersecting the first direction D1. The corners where the first side and the second side of the display device 1 meet can be right angles. However, the present invention is not limited thereto, and the corners can also be curved. In some embodiments, the length of the first side can be different from the length of the second side, but the present invention is not limited thereto. The planar shape of the display device 1 is not limited to the above embodiments, and can also be various other shapes, such as, a circular shape.

[0057] The display device 1 can include a display area DA for displaying an image and a non-display area NDA for not displaying an image. In some embodiments, the non-display area NDA can be provided around the display area DA and can surround the display area DA.

[0058] Unless otherwise defined, the terms "upper", "upper part", "above", "top" and "upper surface" used herein represent the direction pointed by the arrow in a third direction D3 intersecting the first direction D1 and the second direction D2 in the drawings, and the terms "below", "lower part", "below", "bottom" and "lower surface" used herein represent the direction opposite to the direction pointed by the arrow in the third direction D3 in the drawings.

[0059] Regarding the schematic stacked structure of the display device 1, in some embodiments, the display device 1 includes a display substrate 10 and a color conversion substrate 30 facing the display substrate 10, and may further include a sealing member 50 that joins the display substrate 10 and the color conversion substrate 30, and a filler 70 that fills the space between the display substrate 10 and the color conversion substrate 30.

[0060] The display substrate 10 may include elements and circuits for displaying an image (e.g., a pixel circuit such as a switching element), a pixel defining layer that defines a light-emitting region and a non-light-emitting region in the display area DA, and a self-emitting element. In an embodiment, the self-emitting element may include at least one of an organic light-emitting diode, a quantum dot light-emitting diode, a micro light-emitting diode based on an inorganic material (e.g., a micro "LED"), and a nano LED based on an inorganic material. For ease of description, the self-emitting element will be described as an organic light-emitting diode hereinafter.

[0061] The color conversion substrate 30 may be disposed on the display substrate 10 and may face the display substrate 10. In some embodiments, the color conversion substrate 30 may include a color conversion pattern that converts the color of incident light. In some embodiments, the color conversion pattern may include at least any one of a color filter and a wavelength conversion pattern.

[0062] The sealing member 50 may be disposed between the display substrate 10 and the color conversion substrate 30 in the non-display area NDA. The sealing member 50 may be disposed in the non-display area NDA along the edges of the display substrate 10 and the color conversion substrate 30 in a plan view to surround the display area DA. The display substrate 10 and the color conversion substrate 30 may be joined to each other by the sealing member 50.

[0063] In some embodiments, the sealing member 50 may include an organic material. For example, in an embodiment, the sealing member 50 may include, but is not limited to, an epoxy resin.

[0064] The filler 70 may be disposed in the space between the display substrate 10 and the color conversion substrate 30 and is surrounded by the sealing member 50. The filler 70 may fill the space between the display substrate 10 and the color conversion substrate 30.

[0065] In some embodiments, the filler 70 may include a material capable of transmitting light. In some embodiments, the filler 70 may include an organic material. In an embodiment, the filler 70 may include, for example, a silicon-based organic material or an epoxy-based organic material, but the present invention is not limited thereto. In an embodiment, the filler 70 may be omitted.

[0066] However, the present invention is not limited to the above description. In an embodiment, the color conversion pattern may be directly provided on the display substrate 10 or may be included in the display substrate 10. In this case, the above-described sealing member 50 and filling member 70 may be omitted. Hereinafter, a case where the display device 1 includes the display substrate 10 and the color conversion substrate 30 will be described as an example, but the present invention is not limited thereto.

[0067] Figure 3 is Figure 1 and Figure 2 FIG. is a schematic plan view of the display substrate 10 shown in the display area DA of the display device 1. Figure 4 is Figure 1 and Figure 2 FIG. is a schematic plan view of the color conversion substrate 30 shown in the display area DA of the display device 1.

[0068] In addition to Figure 1 and Figure 2 also refer to Figure 3 and Figure 4 , a plurality of light-emitting regions LA1 to LA3 and non-light-emitting regions NLA may be defined in the display substrate 10 in the display area DA. Each of the light-emitting regions LA1 to LA3 may be a region where light generated by the light-emitting element of the display substrate 10 is emitted outside the display substrate 10, and the non-light-emitting region NLA may be a region where light is not emitted outside the display substrate 10.

[0069] In some embodiments, the light provided from the display substrate 10 to the color conversion substrate 30 in each of the light-emitting regions LA1 to LA3 may be light of a first color. In some embodiments, the light of the first color may be blue light and may have a peak wavelength in the range of about 440 nanometers (nm) to about 480 nm. The peak wavelength may refer to the wavelength at which the intensity is maximum in the wavelength region.

[0070] In some embodiments, the first light-emitting region LA1, the second light-emitting region LA2, and the third light-emitting region LA3 may be sequentially and repeatedly provided in the first row RL1 of the display substrate 10 in the display area DA along the first direction D1. In addition, the first light-emitting region LA1, the second light-emitting region LA2, and the third light-emitting region LA3 may be sequentially and repeatedly provided in the second row RL2 adjacent to the first row RL1 along the second direction D2.

[0071] In some embodiments, a first width WL1 of the first light-emitting region LA1 measured along a first direction D1 may be greater than a second width WL2 of the second light-emitting region LA2 measured along the first direction D1 and a third width WL3 of the third light-emitting region LA3 measured along the first direction D1. In some embodiments, the second width WL2 of the second light-emitting region LA2 and the third width WL3 of the third light-emitting region LA3 may be different from each other. In an embodiment, for example, the second width WL2 of the second light-emitting region LA2 may be greater than the third width WL3 of the third light-emitting region LA3. Further, in some embodiments, an area of the first light-emitting region LA1 may be greater than an area of the second light-emitting region LA2 and an area of the third light-emitting region LA3. The area of the second light-emitting region LA2 may be greater than the area of the third light-emitting region LA3 or may be less than the area of the third light-emitting region LA3. However, the present invention is not limited to the above embodiments. In an embodiment, the first width WL1 of the first light-emitting region LA1 measured along the first direction D1 may be substantially equal to the second width WL2 of the second light-emitting region LA2 measured along the first direction D1 and the third width WL3 of the third light-emitting region LA3 measured along the first direction D1. In an embodiment, the areas of the first light-emitting region LA1, the second light-emitting region LA2, and the third light-emitting region LA3 may be substantially equal.

[0072] A plurality of light-transmitting regions TA1 to TA3 and a light-blocking region BA may be defined in a color conversion substrate 30 in a display area DA. Each of the light-transmitting regions TA1 to TA3 may be a region where light emitted from the display substrate 10 is transmitted through the color conversion substrate 30 and provided to the outside of the display device 1. The light-blocking region BA may be a region that does not transmit light emitted from the display substrate 10.

[0073] In some embodiments, the first light-transmitting region TA1, the second light-transmitting region TA2, and the third light-transmitting region TA3 may be sequentially and repeatedly provided in a first row RT1 of the color conversion substrate 30 in the display area DA along the first direction D1. The first light-transmitting region TA1 may correspond to or overlap with the first light-emitting region LA1. Similarly, the second light-transmitting region TA2 may correspond to or overlap with the second light-emitting region LA2, and the third light-transmitting region TA3 may correspond to or overlap with the third light-emitting region LA3.

[0074] In some embodiments, the light of the first color provided by the display substrate 10 can be emitted outside the display device 1 through the first light-transmitting region TA1, the second light-transmitting region TA2, and the third light-transmitting region TA3. When the light emitted outside the display device 1 in the first light-transmitting region TA1 is referred to as the first output light, the light emitted outside the display device 1 in the second light-transmitting region TA2 is referred to as the second output light, and the light emitted outside the display device 1 in the third light-transmitting region TA3 is referred to as the third output light, the first output light can be the light of the first color, the second output light can be the light of the second color different from the first color, and the third output light can be the light of the third color different from the first color and the second color. In some embodiments, the light of the first color can be blue light having a peak wavelength in the range of about 440 nm to about 480 nm as described above, and the light of the second color can be red light having a peak wavelength in the range of about 610 nm to about 650 nm. In addition, the light of the third color can be green light having a peak wavelength in the range of about 530 nm to about 570 nm. However, the present invention is not limited thereto. The light of the second color can also be green light, and the light of the third color can also be red light.

[0075] The first light-transmitting region TA1, the second light-transmitting region TA2, and the third light-transmitting region TA3 can also be sequentially and repeatedly arranged along the first direction D1 in the second row RT2 adjacent to the first row RT1 along the second direction D2.

[0076] Similar to the first light-emitting region LA1, the second light-emitting region LA2, and the third light-emitting region LA3, in some embodiments, the first width WT1 of the first light-transmitting region TA1 measured along the first direction D1 can be greater than the second width WT2 of the second light-transmitting region TA2 measured along the first direction D1 and the third width WT3 of the third light-transmitting region TA3 measured along the first direction D1. In some embodiments, the second width WT2 of the second light-transmitting region TA2 and the third width WT3 of the third light-transmitting region TA3 can be different from each other. In an embodiment, for example, the second width WT2 of the second light-transmitting region TA2 can be greater than the third width WT3 of the third light-transmitting region TA3, or can be less than the third width WT3 of the third light-transmitting region TA3. In addition, in some embodiments, the area of the first light-transmitting region TA1 can be greater than the areas of the second light-transmitting region TA2 and the third light-transmitting region TA3, or can be equal to or less than the areas of the second light-transmitting region TA2 and the third light-transmitting region TA3.

[0077] However, the present invention is not limited to the above-described embodiments. In the embodiments, a first width WT1 of the first light-transmitting region TA1 measured along a first direction D1 may be substantially equal to a second width WT2 of the second light-transmitting region TA2 measured along the first direction D1 and a third width WT3 of the third light-transmitting region TA3 measured along the first direction D1. In the embodiments, an area of the first light-transmitting region TA1 may be substantially equal to an area of the second light-transmitting region TA2 and an area of the third light-transmitting region TA3.

[0078] The light-blocking region BA may be disposed around the light-transmitting regions TA1 to TA3 of the color conversion substrate 30 in the display region DA. In some embodiments, the light-blocking region BA may be divided into a first light-blocking region BA1, a second light-blocking region BA2, a third light-blocking region BA3, and a fourth light-blocking region BA4.

[0079] The first light-blocking region BA1 may be disposed between the third light-transmitting region TA3 and the first light-transmitting region TA1 along the first direction D1, the second light-blocking region BA2 may be disposed between the first light-transmitting region TA1 and the second light-transmitting region TA2 along the first direction D1, and the third light-blocking region BA3 may be disposed between the second light-transmitting region TA2 and the third light-transmitting region TA3 along the first direction D1.

[0080] The fourth light-blocking region BA4 may be disposed between a first row RT1 and a second row RT2 adjacent to each other along a second direction D2.

[0081] Now, the structure of the display device 1 will be described in more detail.

[0082] Figure 5 is a cross-sectional view of an embodiment of the display device 1 taken along a line X1-X1' of Figure 3 and Figure 4 is an enlarged cross-sectional view of a portion Q1 of Figure 6 is Figure 5 is an enlarged cross-sectional view of a portion Q2 of Figure 7 is Figure 5 is an enlarged cross-sectional view of a portion Q3 of Figure 8 is Figure 5 is an enlarged cross-sectional view of a portion Q4 of Figure 9 is Figure 5 is an enlarged cross-sectional view of a portion Q4 of. For reference, Figure 3 the position of the line X1-X1' of Figure 4 is the same as the position of the line X1-X1' of

[0083] In addition to Figure 3 and Figure 4 also refer to Figures 5 to 9, as described above, the display device 1 may include a display substrate 10 and a color conversion substrate 30, and may further include a filler 70 disposed between the display substrate 10 and the color conversion substrate 30.

[0084] The display substrate 10 will now be described in more detail.

[0085] The first substrate 110 may include a light-transmissive material. In some embodiments, the first substrate 110 may be a glass substrate or a plastic substrate. When the first substrate 110 is a plastic substrate, it may be flexible. In some embodiments, the first substrate 110 may further include a separate layer disposed on the glass substrate or the plastic substrate, such as a buffer layer or an insulating layer.

[0086] In some embodiments, light-emitting regions LA1 to LA3 and non-light-emitting regions NLA as described above with reference to Figure 3 and Figure 4 may be defined in the first substrate 110.

[0087] As Figure 5 shown, switching elements T1 to T3 may be disposed on the first substrate 110. In some embodiments, the first switching element T1 may be disposed in the first light-emitting region LA1, the second switching element T2 may be disposed in the second light-emitting region LA2, and the third switching element T3 may be disposed in the third light-emitting region LA3. However, the present invention is not limited thereto. In an embodiment, at least any one of the first switching element T1, the second switching element T2, and the third switching element T3 may be disposed in the non-light-emitting region NLA.

[0088] In some embodiments, each of the first switching element T1, the second switching element T2, and the third switching element T3 may be a thin film transistor including polysilicon or a thin film transistor including an oxide semiconductor.

[0089] Although not shown in the drawings, a plurality of signal lines (e.g., gate lines, data lines, and power lines) for transmitting signals to each switching element may also be disposed on the first substrate 110.

[0090] An insulating layer 130 may be disposed on the first switching element T1, the second switching element T2, and the third switching element T3. In some embodiments, the insulating layer 130 may be a planarization layer. In some embodiments, the insulating layer 130 may include an organic layer. For example, in an embodiment, the insulating layer 130 may include an acrylic resin, an epoxy resin, an imide resin, or an ester resin. In some embodiments, the insulating layer 130 may include a positive photosensitive material or a negative photosensitive material.

[0091] As Figure 5As shown, a first anode AE1, a second anode AE2, and a third anode AE3 may be disposed on an insulating layer 130. The first anode AE1 may overlap with a first light-emitting region LA1, and at least a portion of the first anode AE1 may extend into a non-light-emitting region NLA. The second anode AE2 may overlap with a second light-emitting region LA2, and at least a portion of the second anode AE2 may extend into the non-light-emitting region NLA. The third anode AE3 may overlap with a third light-emitting region LA3, and at least a portion of the third anode AE3 may extend into the non-light-emitting region NLA. The first anode AE1 may penetrate the insulating layer 130 and may be connected to a first switching element T1, the second anode AE2 may penetrate the insulating layer 130 and may be connected to a second switching element T2, and the third anode AE3 may penetrate the insulating layer 130 and may be connected to a third switching element T3.

[0092] In some embodiments, the first anode AE1, the second anode AE2, and the third anode AE3 may differ from each other in width or area. For example, in an embodiment, the width of the first anode AE1 may be greater than the widths of the second anode AE2 and the third anode AE3, and the width of the third anode AE3 may be less than the width of the second anode AE2. In an alternative embodiment, the area of the first anode AE1 may be greater than the areas of the second anode AE2 and the third anode AE3, and the area of the third anode AE3 may be less than the area of the second anode AE2. However, the present invention is not limited to the above embodiments. In an embodiment, the first anode AE1, the second anode AE2, and the third anode AE3 may be substantially the same in width or area.

[0093] The first anode AE1, the second anode AE2, and the third anode AE3 may be reflective electrodes. In this case, each of the first anode AE1, the second anode AE2, and the third anode AE3 may be a metal layer including a metal such as Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, or Cr. In an embodiment, each of the first anode AE1, the second anode AE2, and the third anode AE3 may further include a metal oxide layer stacked on the metal layer. In an embodiment, each of the first anode AE1, the second anode AE2, and the third anode AE3 may have a multilayer structure, such as a two-layer structure of indium tin oxide (“ITO”) / Ag, Ag / ITO, ITO / Mg, or ITO / MgF, or a three-layer structure of ITO / Ag / ITO.

[0094] The pixel defining layer 150 may be disposed on the first anode AE1, the second anode AE2, and the third anode AE3. Openings exposing the first anode AE1, openings exposing the second anode AE2, and openings exposing the third anode AE3 may be defined in the pixel defining layer 150, and a first light emitting region LA1, a second light emitting region LA2, a third light emitting region LA3, and a non-light emitting region NLA may be defined. That is, the region of the first anode AE1 that is exposed and not covered by the pixel defining layer 150 may be the first light emitting region LA1. Similarly, the region of the second anode AE2 that is exposed and not covered by the pixel defining layer 150 may be the second light emitting region LA2, and the region of the third anode AE3 that is exposed and not covered by the pixel defining layer 150 may be the third light emitting region LA3. In addition, the region where the pixel defining layer 150 is disposed may be the non-light emitting region NLA.

[0095] In some embodiments, the pixel defining layer 150 may include an organic insulating material such as polyacrylate resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, unsaturated polyester resin, polyphenylene ether resin, polyphenylene sulfide resin, or benzocyclobutene (“BCB”).

[0096] In some embodiments, the pixel defining layer 150 may overlap with a color pattern 250 (refer to Figure 10 ) and a light blocking member 220 (refer to Figure 11 ) which will be described later. For example, in an embodiment, as shown in Figure 5 , the pixel defining layer 150 may overlap with a first light blocking member 221, a second light blocking member 222, and a third light blocking member 223. In addition, the pixel defining layer 150 may overlap with a first color pattern 251, a second color pattern 252, and a third color pattern 253.

[0097] The pixel defining layer 150 may overlap with a color mixing prevention member 370 which will be described later.

[0098] As shown in Figure 5 , the light emitting layer OL may be disposed on the first anode AE1, the second anode AE2, and the third anode AE3.

[0099] In some embodiments, the light emitting layer OL may be in the shape of a continuous layer disposed over the light emitting regions LA1 to LA3 and the non-light emitting region NLA. The light emitting layer OL will be described in more detail later.

[0100] As shown in Figure 5 , the cathode CE may be disposed on the light emitting layer OL.

[0101] In some embodiments, the cathode CE may be semi-transparent or transparent. When the cathode CE is semi-transparent, the cathode CE may include Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF, Mo, Ti, or a compound or mixture thereof (e.g., a mixture of Ag and Mg), or a material having a multi-layer structure such as LiF / Ca or LiF / Al. In addition, when the thickness of the cathode CE is from several tens of angstroms to several hundreds of angstroms, the cathode CE may be semi-transparent.

[0102] When the cathode CE is transparent, the cathode CE may include a transparent conductive oxide (“TCO”). For example, in an embodiment, the cathode CE may include tungsten oxide (W x O y ), titanium oxide (TiO2), ITO, indium zinc oxide (“IZO”), zinc oxide (ZnO), indium tin zinc oxide (“ITZO”), or magnesium oxide (MgO).

[0103] The first anode AE1, the light-emitting layer OL, and the cathode CE may form a first light-emitting element ED1, the second anode AE2, the light-emitting layer OL, and the cathode CE may form a second light-emitting element ED2, and the third anode AE3, the light-emitting layer OL, and the cathode CE may form a third light-emitting element ED3. Each of the first light-emitting element ED1, the second light-emitting element ED2, and the third light-emitting element ED3 may emit output light L1, and the output light L1 may be provided to the color conversion substrate 30.

[0104] As Figure 6 shown, the output light L1 finally emitted from the light-emitting layer OL may be a combination of a first light component L11 and a second light component L12. Each of the first light component L11 and the second light component L12 in the output light L1 may have a peak wavelength of about 440 nm to about 480 nm. That is, the output light L1 may be blue light.

[0105] In some embodiments, the light-emitting layer OL may have a structure in which a plurality of light-emitting layers overlap, for example, a tandem structure. For example, in an embodiment, the light-emitting layer OL may include: a first stack ST1 including a first light-emitting layer EML1; a second stack ST2 disposed on the first stack ST1 and including a second light-emitting layer EML2; a third stack ST3 disposed on the second stack ST2 and including a third light-emitting layer EML3; a first charge generation layer CGL1 disposed between the first stack ST1 and the second stack ST2; and a second charge generation layer CGL2 disposed between the second stack ST2 and the third stack ST3. The first stack ST1, the second stack ST2, and the third stack ST3 may overlap each other.

[0106] The first light-emitting layer EML1, the second light-emitting layer EML2, and the third light-emitting layer EML3 may overlap with each other.

[0107] In some embodiments, the first light-emitting layer EML1, the second light-emitting layer EML2, and the third light-emitting layer EML3 may all emit light of a first color, for example, blue light. For example, in an embodiment, each of the first light-emitting layer EML1, the second light-emitting layer EML2, and the third light-emitting layer EML3 may be a blue light-emitting layer and may include an organic material.

[0108] In some embodiments, at least any one of the first light-emitting layer EML1, the second light-emitting layer EML2, and the third light-emitting layer EML3 may emit first blue light having a first peak wavelength, and at least another one of the first light-emitting layer EML1, the second light-emitting layer EML2, and the third light-emitting layer EML3 may emit second blue light having a second peak wavelength different from the first peak wavelength. For example, in an embodiment, any one of the first light-emitting layer EML1, the second light-emitting layer EML2, and the third light-emitting layer EML3 may emit first blue light having a first peak wavelength, and the other two of the first light-emitting layer EML1, the second light-emitting layer EML2, and the third light-emitting layer EML3 may emit second blue light having a second peak wavelength. That is, the output light L1 finally emitted from the light-emitting layer OL may be a combination of a first light component L11 and a second light component L12. The first light component L11 may be first blue light having a first peak wavelength, and the second light component L12 may be second blue light having a second peak wavelength.

[0109] In some embodiments, either one of the first peak wavelength and the second peak wavelength may be in the range of about 440 nm to about 460 nm. The other one of the first peak wavelength and the second peak wavelength may be in the range of about 460 nm to about 480 nm. However, the ranges of the first peak wavelength and the second peak wavelength are not limited to this example. For example, in an embodiment, the ranges of the first peak wavelength and the second peak wavelength may all include about 460 nm. In some embodiments, either one of the first blue light and the second blue light may be dark blue light, and the other one of the first blue light and the second blue light may be sky blue light.

[0110] According to some embodiments, the output light L1 emitted from the light-emitting layer OL is blue light and includes a long-wavelength component and a short-wavelength component. Therefore, the light-emitting layer OL may finally emit blue light having a wider emission peak as the output light L1, thereby improving the color visibility at a side viewing angle as compared with a conventional light-emitting element that emits blue light having a sharp emission peak.

[0111] In some embodiments, each of the first emitting layer EML1, the second emitting layer EML2, and the third emitting layer EML3 may include a host and a dopant. The host is not particularly limited as long as it is a commonly used material. For example, in an embodiment, tris(8-hydroxyquinolinato)aluminum (Alq3), 4,4'-bis(N-carbazolyl)-1,1'-biphenyl ("CBP"), poly(N-vinylcarbazole) ("PVK"), 9,10-bis(naphthalen-2-yl)anthracene ("ADN"), 4,4',4''-tris(carbazol-9-yl)-triphenylamine ("TCTA"), 1,3,5-tris(N-phenylbenzimidazol-2-yl)benzene (TPBi), 3-tert-butyl-9,10-bis(naphthalen-2-yl)anthracene ("TBADN"), stilbene-substituted arylide ("DSA"), 4,4'-bis(9-carbazolyl)-2,2'-dimethyl-biphenyl ("CDBP"), or 2-methyl-9,10-bis(naphthalen-2-yl)anthracene ("MADN") may be used.

[0112] In an embodiment, each of the first emitting layer EML1, the second emitting layer EML2, and the third emitting layer EML3 that emit blue light may include, for example, a fluorescent material, which includes any one of spiro-DPVB1, spiro-6P, diphenylvinyl-benzene ("DSB"), stilbene-substituted aryl compound ("DSA"), a polyfluorene ("PFO")-based polymer, and a poly(p-phenylene vinylene) ("PPV")-based polymer. In an alternative embodiment, a phosphorescent material may be included, and the phosphorescent material includes an organometallic complex such as (4,6-F2ppy)2Irpic.

[0113] As described above, at least one of the first emitting layer EML1, the second emitting layer EML2, and the third emitting layer EML3 and at least another one of the first emitting layer EML1, the second emitting layer EML2, and the third emitting layer EML3 emit blue light in different wavelength ranges. To emit blue light in different wavelength ranges, the first emitting layer EML1, the second emitting layer EML2, and the third emitting layer EML3 may include the same materials as each other, and a method of adjusting the resonant distance may be used. In an alternative embodiment, to emit blue light in different wavelength ranges, at least one of the first emitting layer EML1, the second emitting layer EML2, and the third emitting layer EML3 and at least another one of the first emitting layer EML1, the second emitting layer EML2, and the third emitting layer EML3 may include different materials from each other.

[0114] However, the present invention is not limited thereto. The first emitting layer EML1, the second emitting layer EML2, and the third emitting layer EML3 may all emit blue light having a peak wavelength of about 440 nm to about 480 nm, and may include the same materials as each other.

[0115] In an alternative embodiment, in an embodiment, at least any one of the first emission layer EML1, the second emission layer EML2, and the third emission layer EML3 may emit first blue light having a first peak wavelength, another one of the first emission layer EML1, the second emission layer EML2, and the third emission layer EML3 may emit second blue light having a second peak wavelength different from the first peak wavelength, and yet another one of the first emission layer EML1, the second emission layer EML2, and the third emission layer EML3 may emit third blue light having a third peak wavelength different from the first peak wavelength and the second peak wavelength. In some embodiments, any one of the first peak wavelength, the second peak wavelength, and the third peak wavelength may be in the range of about 440 nm to about 460 nm. In an embodiment, another one of the first peak wavelength, the second peak wavelength, and the third peak wavelength may be in the range of about 460 nm to about 470 nm, and yet another one of the first peak wavelength, the second peak wavelength, and the third peak wavelength may be in the range of about 470 nm to about 480 nm.

[0116] According to some embodiments, the output light L1 emitted from the emission layer OL is blue light and includes a long wavelength component, a medium wavelength component, and a short wavelength component. Accordingly, the emission layer OL may finally emit blue light having a wider emission peak as the output light L1 and improve color visibility at a side viewing angle.

[0117] According to the above embodiments, compared with a conventional light-emitting element that does not employ a tandem structure (i.e., a structure in which a plurality of emission layers are stacked), the light efficiency can be improved and the lifespan of the display device can be extended.

[0118] The first charge generation layer CGL1 may be disposed between the first stack ST1 and the second stack ST2. The first charge generation layer CGL1 may inject charged charges into each emission layer. The first charge generation layer CGL1 may control the charge balance between the first stack ST1 and the second stack ST2. The first charge generation layer CGL1 may include an n-type charge generation layer CGL11 and a p-type charge generation layer CGL12. The p-type charge generation layer CGL12 may be disposed on the n-type charge generation layer CGL11 and may be disposed between the n-type charge generation layer CGL11 and the second stack ST2.

[0119] The first charge generation layer CGL1 may have a structure in which the n-type charge generation layer CGL11 and the p-type charge generation layer CGL12 are in contact with each other. The n-type charge generation layer CGL11 is disposed closer to the anode AE1 ( Figure 5 than AE2, Figure 5of AE3), further away from the cathode CE. The p-type charge generation layer CGL12 is disposed closer to the cathode CE and further away from the anode AE1( Figure 5 of AE2, Figure 5 of AE3). The n-type charge generation layer CGL11 supplies electrons to the first light-emitting layer EML1 adjacent to the anode AE1( Figure 5 of AE2, Figure 5 of AE3). The p-type charge generation layer CGL12 supplies holes to the second light-emitting layer EML2 included in the second stack ST2. Since the first charge generation layer CGL1 is disposed between the first stack ST1 and the second stack ST2 to provide charged charges to each light-emitting layer (each of the first light-emitting layer EML1 and the second light-emitting layer EML2), the light-emitting efficiency can be improved and the driving voltage can be reduced.

[0120] The first stack ST1 can be disposed on the first anode AE1, the second anode AE2 (refer to Figure 5 ), and the third anode AE3 (refer to Figure 5 ), and may further include a first hole transport layer HTL1, a first electron blocking layer BIL1, and a first electron transport layer ETL1.

[0121] The first hole transport layer HTL1 can be disposed on the first anode AE1, the second anode AE2 (refer to Figure 5 ), and the third anode AE3 (refer to Figure 5 ). The first hole transport layer HTL1 can facilitate the transport of holes and may include a hole transport material. In an embodiment, the hole transport material may include, but is not limited to, carbazole derivatives such as N-phenylcarbazole or polyvinylcarbazole; fluorene derivatives; triphenylamine derivatives such as N,N'-bis(3-methylphenyl)-N,N'-diphenyl-[1,1'-biphenyl]-4,4'-diamine ("TPD") or 4,4',4''-tris(N-carbazolyl)triphenylamine ("TCTA"); N,N'-di(1-naphthyl)-N,N'-diphenylbenzidine ("NPB"); or 4,4'-cyclohexylidenebis[N,N-bis(4-methylphenyl)aniline] ("TAPC"). In some embodiments, the first hole transport layer HTL1 may include a single layer. In an alternative embodiment, the first hole transport layer HTL1 may include multiple layers. When the first hole transport layer HTL1 includes multiple layers, the multiple layers may include different materials from each other.

[0122] The first electron blocking layer BIL1 may be disposed on the first hole transport layer HTL1 and may be disposed between the first hole transport layer HTL1 and the first light emitting layer EML1. The first electron blocking layer BIL1 may include a hole transport material and a metal or metal compound to prevent electrons generated by the first light emitting layer EML1 from entering the first hole transport layer HTL1. In some embodiments, the first hole transport layer HTL1 and the first electron blocking layer BIL1 may be provided as a single layer in which their respective materials are mixed. However, the present invention is not limited thereto. In some embodiments, the first electron blocking layer BIL1 may be omitted.

[0123] The first electron transport layer ETL1 may be disposed on the first light emitting layer EML1 and may be disposed between the first charge generation layer CGL1 and the first light emitting layer EML1. In some embodiments, the first electron transport layer ETL1 may include an electron transport material such as tris(8-hydroxyquinolinato)aluminum (Alq3), 1,3,5-tris(1-phenyl-1H-benzo[d]imidazol-2-yl)benzene (TPBi), 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (“BCP”), 4,7-diphenyl-1,10-phenanthroline (Bphen), 3-(4-biphenylyl)-4-phenyl-5-tert-butylphenyl-1,2,4-triazole (“TAZ”), 4-(naphthalen-1-yl)-3,5-diphenyl-4H-1,2,4-triazole (“NTAZ”), 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (tBu-PBD), bis(2-methyl-8-quinolinato-N1,O8)-(1,1'-biphenyl-4-yl)aluminum (BAlq), bis(benzoquinolinato-10-yl)beryllium (BeBq2), ADN, or a combination thereof. However, the present invention is not limited to this type of electron transport material. In some embodiments, the first electron transport layer ETL1 may be composed of a single layer. In alternative embodiments, the first electron transport layer ETL1 may be composed of multiple layers. When the first electron transport layer ETL1 is composed of multiple layers, the multiple layers may include different materials from each other. The second stack ST2 may be disposed on the first charge generation layer CGL1 and may further include a second hole transport layer HTL2, a second electron blocking layer BIL2, and a second electron transport layer ETL2.

[0124] The second hole transport layer HTL2 may be disposed on the first charge generation layer CGL1. The second hole transport layer HTL2 may include the same material as the material of the first hole transport layer HTL1, or may include one or more of the materials included in the first hole transport layer HTL1. The second hole transport layer HTL2 may include a single layer or multiple layers. When the second hole transport layer HTL2 includes multiple layers, the multiple layers may include different materials from each other.

[0125] The second electron blocking layer BIL2 may be disposed on the second hole transport layer HTL2 and may be disposed between the second hole transport layer HTL2 and the second light-emitting layer EML2. The second electron blocking layer BIL2 may have the same material and structure as the material and structure of the first electron blocking layer BIL1, or may include one or more of the materials included in the first electron blocking layer BIL1. In some embodiments, the second electron blocking layer BIL2 may be omitted.

[0126] The second electron transport layer ETL2 may be disposed on the second light-emitting layer EML2 and may be disposed between the second charge generation layer CGL2 and the second light-emitting layer EML2. The second electron transport layer ETL2 may have the same material and structure as the material and structure of the first electron transport layer ETL1, or may include one or more of the materials included in the first electron transport layer ETL1. The second electron transport layer ETL2 may be composed of a single layer or multiple layers. When the second electron transport layer ETL2 is composed of multiple layers, the multiple layers may include different materials from each other.

[0127] The second charge generation layer CGL2 may be disposed on the second stack ST2 and may be disposed between the second stack ST2 and the third stack ST3.

[0128] The second charge generation layer CGL2 may have the same structure as the above-mentioned first charge generation layer CGL1. For example, in an embodiment, the second charge generation layer CGL2 may include an n-type charge generation layer CGL21 and a p-type charge generation layer CGL22. The n-type charge generation layer CGL21 is disposed closer to the second stack ST2 and farther from the cathode CE than the p-type charge generation layer CGL22. The p-type charge generation layer CGL22 is disposed closer to the cathode CE and farther from the second stack ST2 than the n-type charge generation layer CGL21. The p-type charge generation layer CGL22 may be disposed on the n-type charge generation layer CGL21.

[0129] The second charge generation layer CGL2 may have a structure in which the n-type charge generation layer CGL21 and the p-type charge generation layer CGL22 are in contact with each other. The first charge generation layer CGL1 and the second charge generation layer CGL2 may include different materials from each other or the same materials from each other.

[0130] The third stack ST3 may be disposed on the second charge generation layer CGL2 and may further include a third hole transport layer HTL3 and a third electron transport layer ETL3.

[0131] The third hole transport layer HTL3 may be disposed on the second charge generation layer CGL2. The third hole transport layer HTL3 may include the same material as that of the first hole transport layer HTL1, or may include one or more materials included in the first hole transport layer HTL1. The third hole transport layer HTL3 may include a single layer or multiple layers. When the third hole transport layer HTL3 includes multiple layers, the multiple layers may include different materials from each other.

[0132] The third electron transport layer ETL3 may be disposed on the third light emitting layer EML3 and may be disposed between the cathode CE and the third light emitting layer EML3. The third electron transport layer ETL3 may have the same material and structure as those of the first electron transport layer ETL1, or may include one or more materials included in the first electron transport layer ETL1. The third electron transport layer ETL3 may include a single layer or multiple layers. When the third electron transport layer ETL3 includes multiple layers, the multiple layers may include different materials from each other.

[0133] Although not shown in the drawings, a hole injection layer may also be disposed between the first stack ST1 and the first anode AE1, between the first stack ST1 and the second anode AE2 (refer to Figure 5 ), between the first stack ST1 and the third anode AE3 (refer to Figure 5 ), between the second stack ST2 and the first charge generation layer CGL1, and between the third stack ST3 and the second charge generation layer CGL2, at least any one of them. The hole injection layer may facilitate injecting holes into the first light emitting layer EML1, the second light emitting layer EML2, and the third light emitting layer EML3. In some embodiments, the hole injection layer may include, but is not limited to, any one or more of copper phthalocyanine (CuPc), poly(3,4-ethylenedioxythiophene) (“PEDOT”), polyaniline (“PANI”), and N,N'-dinaphthyl-N,N'-diphenylbenzidine (“NPD”). In some embodiments, the hole injection layer may be disposed between the first stack ST1 and the first anode AE1, between the first stack ST1 and the second anode AE2 (refer to Figure 5 ), between the first stack ST and the third anode AE3 (refer to Figure 5 ), between the second stack ST2 and the first charge generation layer CGL1, and between the third stack ST3 and the second charge generation layer CGL2.

[0134] Although not shown in the drawings, an electron injection layer may also be disposed between at least any one of the third electron transport layer ETL3 and the cathode CE, between the second charge generation layer CGL2 and the second stack ST2, and between the first charge generation layer CGL1 and the first stack ST1. The electron injection layer may facilitate the injection of electrons and may use tris(8-hydroxyquinolinato)aluminum (Alq3), PBD, TAZ, spiro-PBD, BAlq, or SAlq, but the present invention is not limited thereto. In an embodiment, the electron injection layer may be a metal halide compound and may be any one or more of, for example, MgF2, LiF, NaF, KF, RbF, CsF, FrF, LiI, NaI, KI, RbI, CsI, FrI, and CaF2, but the present invention is not limited thereto. In an alternative embodiment, the electron injection layer may include a lanthanum material, such as, Yb, Sm, or Eu. In an alternative embodiment, the electron injection layer may include both a metal halide material and a lanthanum material, such as, RbI:Yb or KI:Yb. When the electron injection layer includes both a metal halide material and a lanthanum material, the electron injection layer may be provided by co-deposition of the metal halide material and the lanthanum material. In some embodiments, the electron injection layer may be disposed between the third electron transport layer ETL3 and the cathode CE, between the second charge generation layer CGL2 and the second stack ST2, and between the first charge generation layer CGL1 and the first stack ST1.

[0135] The structure of the light-emitting layer OL may also be modified according to the above structure. For example, in an embodiment, the light-emitting layer OL may include only two stacks, or may include four stacks or more.

[0136] As Figures 5 to 9 shown, the thin film encapsulation layer 170 may be disposed on the cathode CE. The thin film encapsulation layer 170 is disposed in all of the first light-emitting region LA1, the second light-emitting region LA2, the third light-emitting region LA3, and the non-light-emitting region NLA. In some embodiments, the thin film encapsulation layer 170 directly covers the cathode CE. In some embodiments, a cover layer (not shown) covering the cathode CE may also be disposed between the thin film encapsulation layer 170 and the cathode CE. In this case, the thin film encapsulation layer 170 may directly cover the cover layer.

[0137] In some embodiments, the thin film encapsulation layer 170 may include a first encapsulation inorganic layer 171, an encapsulation organic layer 173, and a second encapsulation inorganic layer 175 stacked in sequence on the cathode CE.

[0138] In some embodiments, each of the first encapsulation inorganic layer 171 and the second encapsulation inorganic layer 175 may include silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, silicon oxynitride (SiON), or lithium fluoride.

[0139] In some embodiments, the encapsulation organic layer 173 may include an acrylic resin, a methacrylic resin, polyisoprene, a vinyl resin, an epoxy resin, a polyurethane resin, a cellulose resin, or a perylene resin.

[0140] The stacked structure of the thin film encapsulation layer 170 is not limited to the above embodiments and can be variously changed.

[0141] The panel light-blocking member 190 may be disposed on the thin film encapsulation layer 170. The panel light-blocking member 190 may be disposed on the thin film encapsulation layer 170 and may overlap with the non-light-emitting region NLA. The panel light-blocking member 190 may prevent light from invading between adjacent light-emitting regions and thus causing color mixing, thereby further improving the color gamut.

[0142] In some embodiments, in a plan view, the panel light-blocking member 190 may be disposed in the non-light-emitting region NLA so as to surround each of the light-emitting regions LA1 to LA3.

[0143] The panel light-blocking member 190 may include an organic light-blocking material and may be provided by coating and exposing the organic light-blocking material.

[0144] In an embodiment, the panel light-blocking member 190 may be omitted.

[0145] In addition to Figures 5 to 9 now, the color conversion substrate 30 will also be described with reference to Figures 10 to 13

[0146] Figure 10 is a plan view of an embodiment showing a schematic arrangement of the third color filter 231 and the color pattern 250 in the color conversion substrate 30 of the display device 1. Figure 11 is a plan view of an embodiment showing a schematic arrangement of the light-blocking member 220 in the color conversion substrate 30 of the display device 1. Figure 12 is a plan view showing a schematic arrangement of the first color filter 233 and the second color filter 235 in the color conversion substrate 30 of the display device 1. Figure 13 is a plan view of an embodiment showing a schematic arrangement of the first wavelength conversion pattern 340, the second wavelength conversion pattern 350, and the light-transmitting pattern 330 in the color conversion substrate 30 of the display device 1.

[0147] Referring to Figures 5 to 13 , Figure 5The second substrate 310 shown in [FIG. X] may include a light-transmissive material. In some embodiments, the second substrate 310 may include a glass substrate or a plastic substrate. In some embodiments, the second substrate 310 may further include a separate layer disposed on the glass substrate or the plastic substrate, for example, an insulating layer such as an inorganic layer.

[0148] In some embodiments, as referred to above Figure 4 the light-transmissive regions TA1 to TA3 and the light-blocking region BA may be defined in the second substrate 310.

[0149] As Figure 5 and Figure 10 shown in [FIG. X], the third color filter 231 and the color pattern 250 may be disposed on the surface of the second substrate 310 facing the display substrate 10.

[0150] The third color filter 231 may be disposed on the surface of the second substrate 310 and may overlap with the third light-transmissive region TA3 or the third light-emitting region LA3. In some embodiments, the third color filter 231 disposed in the first row RT1 and the third color filter 231 disposed in the second row RT2 may be spaced apart from each other along the second direction D2. In some embodiments, the fourth color pattern 254 described later may be disposed between the first row RT1 and the second row RT2. In some embodiments, the fourth color pattern 254 may be connected to the third color filter 231 disposed in the first row RT1 and the third color filter 231 disposed in the second row RT2.

[0151] The third color filter 231 may transmit only light of a first color (e.g., blue light) and block or absorb light of a second color (e.g., red light) and light of a third color (e.g., green light). In some embodiments, as Figure 7 shown in [FIG. X], the third color filter 231 may include a base resin 231a and a colorant 231b of the first color in the base resin 231a.

[0152] In some embodiments, the base resin 231a may be an organic material and may be a photocurable resin.

[0153] The colorant 231b of the first color may absorb light of the second color and light of the third color. In some embodiments, the colorant 231b of the first color may be uniformly dispersed in the base resin 231a.

[0154] In some embodiments, the third color filter 231 may be a blue color filter, and the colorant 231b of the first color may be a blue colorant, such as a blue dye or a blue pigment. As used herein, the term "colorant" is a concept that encompasses both dyes and pigments.

[0155] The color pattern 250 can absorb a portion of the light introduced from the outside of the display device 1 into the color conversion substrate 30, thereby reducing the reflected light caused by external light. In the display device 1, a significant portion of the external light is reflected, resulting in color gamut distortion of the color conversion substrate 30. However, in the illustrated embodiment, since the color pattern 250 is provided on the second substrate 310, the amount of reflected external light can be reduced, and color distortion caused by external light can be reduced.

[0156] In some embodiments, the color pattern 250 may include a blue colorant, such as a blue dye or a blue pigment. In some embodiments, the color pattern 250 may include the same material as the material of the third color filter 231 and may be provided simultaneously with the third color filter 231. That is, the third color filter 231 and the color pattern 250 may be provided simultaneously by coating a photocurable composition on the surface of the second substrate 310 and exposing and developing the photocurable composition, wherein the photocurable composition includes a base resin and a blue colorant as a colorant of the third color.

[0157] In some embodiments, the thickness TH2 of the color pattern 250 measured along the third direction D3 may be substantially equal to the thickness TH1 of the third color filter 231 measured along the third direction D3.

[0158] When the color pattern 250 includes a colorant of the third color (e.g., a blue colorant), the external light or the reflected light transmitted through the color pattern 250 has a blue wavelength band. The color sensitivity of the user's eyes varies according to the color of the light. More specifically, compared with the light in the green wavelength band and the light in the red wavelength band, the user may perceive the light in the blue wavelength band less sensitively. Therefore, since the color pattern 250 includes a blue colorant, the user may perceive the reflected light relatively less sensitively.

[0159] The color pattern 250 may be provided on the surface of the second substrate 310 and may overlap with the light blocking region BA or the non-light emitting region NLA. In some embodiments, the color pattern 250 may directly contact the surface of the second substrate 310. In an alternative embodiment, when a separate buffer layer is provided on the surface of the second substrate 310 to prevent the introduction of impurities, the color pattern 250 may directly contact the buffer layer.

[0160] As Figure 10As shown, in some embodiments, the color pattern 250 may be provided throughout the light-blocking region BA. In some embodiments, the color pattern 250 may include a first color pattern 251 overlapping with the first light-blocking region BA1, a second color pattern 252 overlapping with the second light-blocking region BA2, a third color pattern 253 overlapping with the third light-blocking region BA3, and a fourth color pattern 254 overlapping with the fourth light-blocking region BA4. In some embodiments, the fourth color pattern 254 may be connected to the first color pattern 251, the second color pattern 252, and the third color pattern 253.

[0161] In addition, the color pattern 250 may be connected to the third color filter 231.

[0162] As Figure 5 and Figure 11 shown, the light-blocking member 220 may be disposed on the surface of the second substrate 310 facing the display substrate 10. The light-blocking member 220 may overlap with the light-blocking region BA to block the transmission of light. In some embodiments, as Figure 11 shown, the light-blocking member 220 may be arranged in a substantially lattice shape in a plan view.

[0163] In some embodiments, the light-blocking member 220 may include an organic light-blocking material and may be provided by coating and exposing the organic light-blocking material. In some embodiments, the light-blocking member 220 may include a dye or pigment having light-blocking properties and may be a black matrix.

[0164] As described above, external light may cause distortion of the color gamut of the color conversion panel. However, in the illustrated embodiments, when the light-blocking member 220 is disposed on the second substrate 310, at least part of the external light is absorbed by the light-blocking member 220. Accordingly, color distortion caused by reflection of external light may be reduced. In some embodiments, the light-blocking member 220 may prevent color mixing caused by intrusion of light between adjacent light-transmitting regions, thereby further improving the color gamut.

[0165] As Figure 11 shown, in some embodiments, the light-blocking member 220 may include a first light-blocking member 221 overlapping with the first light-blocking region BA1, a second light-blocking member 222 overlapping with the second light-blocking region BA2, a third light-blocking member 223 overlapping with the third light-blocking region BA3, and a fourth light-blocking member 224 overlapping with the fourth light-blocking region BA4. In some embodiments, the first light-blocking member 221, the second light-blocking member 222, and the third light-blocking member 223 may be connected to the fourth light-blocking member 224.

[0166] The light-blocking member 220 may be disposed on the color pattern 250. In some embodiments, the first light-blocking member 221 may be disposed on the first color pattern 251, the second light-blocking member 222 may be disposed on the second color pattern 252, the third light-blocking member 223 may be disposed on the third color pattern 253, and the fourth light-blocking member 224 may be disposed on the fourth color pattern 254.

[0167] Since the color pattern 250 is disposed between the light-blocking member 220 and the second substrate 310, in some embodiments, the light-blocking member 220 may not contact the second substrate 310.

[0168] As Figure 5 and Figure 12 shown in

[0169] The first color filter 233 and the second color filter 235 may be disposed on the surface of the second substrate 310 facing the display substrate 10.

[0170] As Figure 5 shown in

[0171] In some embodiments, one side of the first color filter 233 may overlap with the first light-blocking region BA1 and may be disposed on the first color pattern 251 and the first light-blocking member 221. The other side of the first color filter 233 may overlap with the second light-blocking region BA2 and may be disposed on the second color pattern 252 and the second light-blocking member 222. Figure 5 shown in

[0172] In some embodiments, one side of the second color filter 235 may overlap with the second light-blocking region BA2 and may be disposed on the second color pattern 252 and the second light-blocking member 222. In addition, in some embodiments, the other side of the second color filter 235 may overlap with the third light-blocking region BA3 and may be disposed on the third color pattern 253 and the third light-blocking member 223. Figure 12 shown in Figure 11 In some embodiments, each of the first color filter 233 and the second color filter 235 may be shaped like a strip extending along the second direction D2 and may pass through the fourth light-blocking region BA4 between the first row RT1 and the second row RT2. Thus, the first color filter 233 and the second color filter 235 may be disposed on the fourth light-blocking member 224 (refer to Figure 10) and the fourth light-blocking member 224. However, the present invention is not limited thereto. In an embodiment, at least one of the first color filter 233 and the second color filter 235 may be formed to be similar to an island pattern, and the island pattern is spaced apart from another island pattern along the second direction D2.

[0173] In some embodiments, the first color filter 233 may block or absorb light of a first color (e.g., blue light). That is, the first color filter 233 may be used as a blue light-blocking filter that blocks blue light. In some embodiments, the first color filter 233 may transmit only light of a second color (e.g., red light), and block or absorb light of a first color (e.g., blue light) and light of a third color (e.g., green light).

[0174] In some embodiments, as Figure 8 shown, the first color filter 233 may include a base resin 233a and a colorant 233b of a second color disposed in the base resin 233a.

[0175] In some embodiments, the base resin 233a may be an organic material and may be a photocurable resin. In some embodiments, the base resin 233a may be an organic material having light-transmitting properties.

[0176] The colorant 233b of the second color may absorb or block light of the first color and light of the third color, and transmit light of the second color. In some embodiments, the colorant 233b of the second color may be uniformly dispersed in the base resin 233a.

[0177] In some embodiments, the first color filter 233 may be a red color filter, and the colorant 233b of the second color may be a red colorant, such as a red dye or a red pigment.

[0178] The first color filter 233 may further include a first light-absorbing colorant ca1. The first light-absorbing colorant ca1 may be uniformly dispersed in the base resin 233a. The first light-absorbing colorant ca1 may absorb or block short-wavelength components of light of the second color (e.g., red light) transmitted through the colorant 233b of the second color. For example, in an alternative embodiment, the first light-absorbing colorant ca1 may block or absorb a combination of short-wavelength components of light of the second color and light of the third color, e.g., yellow light (a combination of short-wavelength components of red light and green light). For example, in an embodiment, the first light-absorbing colorant ca1 may be a yellow light-absorbing colorant that absorbs yellow light.

[0179] In some embodiments, the first light-absorbing colorant ca1 may be a magenta colorant, such as a magenta dye or a magenta pigment. For example, in an embodiment, when the magenta colorant applied to the first light-absorbing colorant ca1 is a magenta pigment, C.I. Pigment Red 122, C.I. Pigment Red 202, C.I. Pigment Red 209, C.I. Pigment Red 264, C.I. Pigment Red 269, C.I. Pigment Violet 19, C.I. Pigment Violet 23, etc., among the compounds classified as pigments in the Color Index (C.I., published by the Society of Dyers and Colourists), may be applied as the magenta pigment.

[0180] The first light-absorbing colorant ca1 may absorb or block short-wavelength components of red light among external light that are not blocked by the colorant 233b of the second color, thereby preventing or reducing the light emitted from the first wavelength conversion pattern 340 due to external light. This will be described in more detail later.

[0181] The second color filter 235 may block or absorb light of the first color (e.g., blue light). That is, the second color filter 235 may also be used as a blue light blocking filter. In some embodiments, the second color filter 235 may transmit only light of the third color (e.g., green light), and block or absorb light of the first color (e.g., blue light) and light of the second color (e.g., red light).

[0182] In some embodiments, as Figure 9 shown, the second color filter 235 may include a base resin 235a and a colorant 235b of the third color disposed in the base resin 235a.

[0183] In some embodiments, the base resin 235a may be an organic material and may be a photocurable resin.

[0184] The colorant 235b of the third color may absorb or block light of the first color and light of the second color, and transmit light of the third color. In some embodiments, the colorant 235b of the third color may be uniformly dispersed in the base resin 235a.

[0185] In some embodiments, the second color filter 235 may be a green color filter, and the colorant 235b of the third color may be a green colorant, such as a green dye or a green pigment.

[0186] As Figure 5 shown, the first cover layer 391 may be disposed on the surface of the second substrate 310 to cover the light blocking member 220 (refer to Figure 11 ), the color pattern 250 (refer to Figure 10) a third color filter 231, a first color filter 233, and a second color filter 235. In some embodiments, the first cover layer 391 may directly contact the first color filter 233, the second color filter 235, and the third color filter 231.

[0187] The first cover layer 391 may also contact the light blocking member 220. For example, in an embodiment, as Figure 5 shown, the first light blocking member 221 may directly contact the first cover layer 391 in the first light blocking region BA1. In addition, the second light blocking member 222 may contact the first cover layer 391 in the second light blocking region BA2, and the third light blocking member 223 may contact the first cover layer 391 in the third light blocking region BA3.

[0188] The first cover layer 391 can prevent impurities such as moisture or air from being introduced from the outside and damaging or contaminating the light blocking member 220, the color pattern 250, the first color filter 233, the second color filter 235, and the third color filter 231. In addition, the first cover layer 391 can prevent the colorants included in the first color filter 233, the second color filter 235, and the third color filter 231 from diffusing into the first wavelength conversion pattern 340, the second wavelength conversion pattern 350, the light transmissive pattern 330, etc. In some embodiments, the first cover layer 391 may include an inorganic material. For example, in an embodiment, the first cover layer 391 may include silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, or silicon oxynitride.

[0189] As Figure 5 shown, the light transmissive pattern 330, the first wavelength conversion pattern 340, and the second wavelength conversion pattern 350 may be disposed on the first cover layer 391.

[0190] In some embodiments, the light transmissive pattern 330, the first wavelength conversion pattern 340, and the second wavelength conversion pattern 350 may be provided by coating a photosensitive material and exposing and developing the photosensitive material. However, the present invention is not limited thereto, and the light transmissive pattern 330, the first wavelength conversion pattern 340, and the second wavelength conversion pattern 350 may also be provided by an inkjet method.

[0191] The light transmissive pattern 330 may be disposed on the first cover layer 391 and may overlap with the third light transmissive region TA3 or the third light emitting region LA3. In some embodiments, as Figure 13As shown, the light-transmitting pattern 330 may be formed to be similar to a strip extending along the second direction D2 and may pass through the fourth light-blocking region BA4 between the first row RT1 and the second row RT2. However, the present invention is not limited thereto. In some embodiments, the light-transmitting pattern 330 may have a structure in which a portion overlapping with the third light-transmitting region TA3 in the first row RT1 and a portion overlapping with the third light-transmitting region TA3 in the second row RT2 are spaced apart from each other. For example, the light-transmitting pattern 330 may be formed to be similar to an island pattern.

[0192] The light-transmitting pattern 330 may transmit incident light. The output light L1 provided by the third light-emitting element ED3 may be blue light as described above. The output light L1, which is blue light, passes through the light-transmitting pattern 330 and the third color filter 231 and is then emitted to the outside of the display device 1. That is, the first light La emitted from the third light-transmitting region TA3 may be blue light.

[0193] In some embodiments, the light-transmitting pattern 330 may include a first base resin 331 and may further include a first scatterer 333 dispersed in the first base resin 331.

[0194] The first base resin 331 may include a material having a high light transmittance (hereinafter, "light transmittance" is also referred to as "transmittance"). In some embodiments, the first base resin 331 may include an organic material. For example, in an embodiment, the first base resin 331 may include an organic material such as an epoxy resin, an acrylic resin, a cardo resin, or an imide resin.

[0195] The first scatterer 333 may have a refractive index different from that of the first base resin 331 and may form an optical interface with the first base resin 331. For example, in an embodiment, the first scatterer 333 may be light-scattering particles. The first scatterer 333 is not particularly limited as long as it is a material that can scatter at least a part of the transmitted light. For example, in an embodiment, the first scatterer 333 may be metal oxide particles or organic particles. In an embodiment, the metal oxide may be, for example, titanium oxide (TiO2), zirconium oxide (ZrO2), aluminum oxide (Al2O3), indium oxide (In2O3), zinc oxide (ZnO), or tin oxide (SnO2). The material of the organic particles may be, for example, an acrylic resin or a polyurethane resin. Regardless of the incident direction of the incident light, the first scatterer 333 may scatter the incident light in a random direction without substantially changing the wavelength of the light transmitted through the light-transmitting pattern 330.

[0196] As described above, the light-transmitting pattern 330 may be in direct contact with the first cover layer 391 in the third light-transmitting region TA3.

[0197] The first wavelength conversion pattern 340 may be disposed on the first cover layer 391 and may overlap with the first light transmissive region TA1 or the first light emitting region LA1. In some embodiments, as Figure 13 shown, the first wavelength conversion pattern 340 may be shaped like a strip extending along the second direction D2 and may pass through the fourth light blocking region BA4 between the first row RT1 and the second row RT2. However, the present invention is not limited thereto. In some embodiments, the first wavelength conversion pattern 340 may have a structure in which the portion disposed in the first row RT1 and the portion disposed in the second row RT2 are spaced apart from each other. For example, the first wavelength conversion pattern 340 may be shaped like an island pattern.

[0198] The first wavelength conversion pattern 340 may convert or shift the peak wavelength of the incident light to another predetermined peak wavelength and output light having the predetermined peak wavelength. In some embodiments, the first wavelength conversion pattern 340 may convert the output light L1 provided by the first light emitting element ED1 into red light having a peak wavelength in the range of about 610 nm to about 650 nm and output the red light. The emission spectrum and the light absorption spectrum of the first wavelength conversion pattern 340 will be described in more detail later.

[0199] In some embodiments, the first wavelength conversion pattern 340 may include a second base resin 341 and a first wavelength shifter 345 dispersed in the second base resin 341, and may further include a second scatterer 343 dispersed in the second base resin 341.

[0200] The second base resin 341 may include a material having a high light transmittance. In some embodiments, the second base resin 341 may include an organic material. In some embodiments, the second base resin 341 may include the same material as the material of the first base resin 331, or may include at least one of the materials exemplified as the constituent materials of the first base resin 331.

[0201] The first wavelength shifter 345 may convert or shift the peak wavelength of the incident light to another predetermined peak wavelength. In some embodiments, the first wavelength shifter 345 may convert the output light L1 of the first color (blue light provided by the first light emitting element ED1) into red light having a single peak wavelength in the range of about 610 nm to about 650 nm and output the red light.

[0202] Examples of the first wavelength shifter 345 may include quantum dots, quantum rods, and phosphors. For example, in an embodiment, a quantum dot may be a particulate material that emits light of a predetermined color when an electron transitions from the conduction band to the valence band.

[0203] Quantum dots can be semiconductor nanocrystal materials. Depending on the composition and size of the quantum dots, the quantum dots can have a predetermined bandgap. Thus, the quantum dots can absorb light and then emit light with a unique wavelength. Examples of the semiconductor nanocrystals of the quantum dots include Group IV nanocrystals, Group II-VI compound nanocrystals, Group III-V compound nanocrystals, Group IV-VI nanocrystals, and combinations thereof.

[0204] In an embodiment, the Group II-VI compound can include binary compounds, ternary compounds, and quaternary compounds. The binary compounds include one of CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS, and combinations thereof. The ternary compounds include InZnP, AgInS, CuInS, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS, and combinations thereof. The quaternary compounds include HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe, and combinations thereof.

[0205] In an embodiment, the Group III-V compound can include binary compounds, ternary compounds, and quaternary compounds. The binary compounds include one of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, and combinations thereof. The ternary compounds include one of GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InGaP, InNP, InAIP, InNAs, InNSb, InPAs, InPSb, GaAlNP, and combinations thereof. The quaternary compounds include one of GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, and combinations thereof.

[0206] In an embodiment, the group-IV-VI compound may include a binary compound, a ternary compound, and a quaternary compound. The binary compound includes one of SnS, SnSe, SnTe, PbS, PbSe, PbTe, and combinations thereof. The ternary compound includes one of SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, and combinations thereof. The quaternary compound includes one of SnPbSSe, SnPbSeTe, SnPbSTe, and combinations thereof. In an embodiment, the group-IV element may include one of silicon (Si) and germanium (Ge). The group-IV compound may be a binary compound including one of silicon carbide (SiC) and silicon germanium (SiGe) and combinations thereof.

[0207] Here, the binary compound, ternary compound, or quaternary compound may be present in the particles at a uniform concentration or may be present in the same particles at partially different concentrations. Further, they may have a core / shell structure in which one quantum dot surrounds another quantum dot. The interface between the core and the shell may have a concentration gradient in which the concentration of the elements in the shell decreases towards the center.

[0208] In some embodiments, the quantum dot may have a core-shell structure including a core including the above-described nanocrystals and a shell surrounding the core. The shell of each quantum dot may be used as a protective layer for maintaining semiconductor characteristics by preventing chemical denaturation of the core and / or as a charging layer for providing electrophoretic characteristics to the quantum dot. The shell may be a single layer or multiple layers. The interface between the core and the shell may have a concentration gradient in which the concentration of the elements in the shell decreases towards the center. The shell of each quantum dot may be, for example, a metal or non-metal oxide, a semiconductor compound, or a combination thereof.

[0209] In an embodiment, the metal or non-metal oxide may be, but is not limited to, a binary compound (such as SiO2, Al2O3, TiO2, ZnO, MnO, Mn2O3, Mn3O4, CuO, FeO, Fe2O3, Fe3O4, CoO, Co3O4, or NiO) or a ternary compound (such as MgAl2O4, CoFe2O4, NiFe2O4, or CoMn2O4).

[0210] In an embodiment, the semiconductor compound may be, but is not limited to, CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnSeS, ZnTeS, GaAs, GaP, GaSb, HgS, HgSe, HgTe, InAs, InP, InGaP, InSb, AlAs, AlP, or AlSb.

[0211] In an embodiment, the light emitted from the first wavelength shifter 345 may have an emission wavelength spectrum with a full width at half maximum ("FWHM") of about 45 nm or less, about 40 nm or less, or about 30 nm or less. Accordingly, the color purity and color reproducibility of the display device 1 may also be improved. In addition, regardless of the incident direction of the incident light, the light emitted from the first wavelength shifter 345 may be radiated in all directions. Accordingly, the lateral visibility of the second color displayed in the second light-transmitting region TA2 may be improved.

[0212] A part of the output light L1 provided by the first light-emitting element ED1 may be transmitted through the first wavelength conversion pattern 340 without being converted into red light by the first wavelength shifter 345. In the output light L1, the component incident on the first color filter 233 without being converted by the first wavelength conversion pattern 340 may be blocked by the first color filter 233. The red light into which the output light L1 has been converted by the first wavelength conversion pattern 340 may be transmitted through the first color filter 233 and emitted to the outside. That is, the second light Lb emitted from the first light-transmitting region TA1 may be red light.

[0213] The second scatterer 343 may have a refractive index different from that of the second base resin 341 and may form an optical interface with the second base resin 341. For example, in an embodiment, the second scatterer 343 may be light-scattering particles. Other details of the second scatterer 343 are substantially the same as or similar to those of the first scatterer 333, and thus the description thereof is omitted.

[0214] The second wavelength conversion pattern 350 may be provided on the first cover layer 391 and may overlap with the second light-transmitting region TA2 or the second light-emitting region LA2. In some embodiments, as Figure 13 shown, the second wavelength conversion pattern 350 may be shaped like a strip extending along the second direction D2 and may pass through the fourth light-blocking region BA4 between the first row RT1 and the second row RT2. However, the present invention is not limited thereto. In some embodiments, the second wavelength conversion pattern 350 may have a structure in which the portion provided in the first row RT1 and the portion provided in the second row RT2 are spaced apart from each other. For example, the second wavelength conversion pattern 350 may be shaped like an island pattern.

[0215] The second wavelength conversion pattern 350 may convert or shift the peak wavelength of the incident light to another predetermined peak wavelength and output light having the predetermined peak wavelength. In some embodiments, the second wavelength conversion pattern 350 may convert the output light L1 provided by the second light-emitting element ED2 into green light in the range of about 510 nm to about 550 nm and output the green light. The emission spectrum and light absorption spectrum of the second wavelength conversion pattern 350 will be described in more detail later.

[0216] In some embodiments, the second wavelength conversion pattern 350 may include a third base resin 351 and a second wavelength shifter 355 dispersed in the third base resin 351, and may further include a third scatterer 353 dispersed in the third base resin 351.

[0217] The third base resin 351 may include a material having a high light transmittance. In some embodiments, the third base resin 351 may include an organic material. In some embodiments, the third base resin 351 may include the same material as the material of the first base resin 331, or may include at least one of the materials exemplified as the constituent materials of the first base resin 331.

[0218] The second wavelength shifter 355 may convert or shift the peak wavelength of the incident light to another predetermined peak wavelength. In some embodiments, the second wavelength shifter 355 may convert blue light having a peak wavelength in the range of about 440 nm to about 480 nm to green light having a peak wavelength in the range of about 510 nm to about 550 nm.

[0219] Examples of the second wavelength shifter 355 may include quantum dots, quantum rods, and phosphors. The second wavelength shifter 355 is substantially the same as or similar to the above-described first wavelength shifter 345, and thus a more detailed description thereof is omitted.

[0220] In some embodiments, both the first wavelength shifter 345 and the second wavelength shifter 355 may include quantum dots. In this case, the particle size of the quantum dots constituting the first wavelength shifter 345 may be larger than the particle size of the quantum dots constituting the second wavelength shifter 355.

[0221] The third scatterer 353 may have a refractive index different from that of the third base resin 351 and may form an optical interface with the third base resin 351. In an embodiment, the third scatterer 353 may be a light-scattering particle. For example, other details of the third scatterer 353 are substantially the same as or similar to those of the second scatterer 343, and thus a description thereof is omitted.

[0222] In an embodiment, the output light L1 emitted from the second light-emitting element ED2 may be provided to the second wavelength conversion pattern 350, and the second wavelength shifter 355 may convert the output light L1 provided by the second light-emitting element ED2 to green light having a peak wavelength in the range of about 510 nm to about 550 nm and emit the green light.

[0223] A part of the output light L1 that is blue light can be transmitted through the second wavelength conversion pattern 350 without being converted into green light by the second wavelength shifter 355 and can be blocked by the second color filter 235. The green light into which the output light L1 has been converted by the second wavelength conversion pattern 350 can be transmitted through the second color filter 235 and emitted to the outside. Therefore, the third light Lc emitted to the outside of the display device 1 through the second light transmissive region TA2 can be green light.

[0224] The second cover layer 393 may be disposed on the light transmissive pattern 330, the first wavelength conversion pattern 340, and the second wavelength conversion pattern 350. The second cover layer 393 may cover the light transmissive pattern 330, the first wavelength conversion pattern 340, and the second wavelength conversion pattern 350. The second cover layer 393 may contact the first cover layer 391 and seal the light transmissive pattern 330, the first wavelength conversion pattern 340, and the second wavelength conversion pattern 350. Accordingly, impurities such as moisture or air can be prevented from being introduced from the outside and damaging or contaminating the light transmissive pattern 330, the first wavelength conversion pattern 340, and the second wavelength conversion pattern 350. In some embodiments, the second cover layer 393 may include an inorganic material. In some embodiments, the second cover layer 393 may include the same material as the material of the first cover layer 391, or may include at least one of the materials mentioned in the description of the first cover layer 391. When both the first cover layer 391 and the second cover layer 393 include an inorganic material, a portion where the first cover layer 391 and the second cover layer 393 are in direct contact with each other may form an inorganic-inorganic bond, and moisture or air can be effectively blocked from being introduced from the outside.

[0225] As Figure 5 shown, the color mixing prevention member 370 may be disposed on the second cover layer 393. The color mixing prevention member 370 may be disposed in the light blocking region BA to block light transmission. More specifically, the color mixing prevention member 370 may be disposed between the light transmissive pattern 330 and the first wavelength conversion pattern 340 and between the first wavelength conversion pattern 340 and the second wavelength conversion pattern 350 to prevent color mixing between adjacent light transmissive regions. In some embodiments, the color mixing prevention member 370 may be shaped like a strip extending along the second direction D2 (refer to Figure 11 ) and may prevent color mixing between light transmissive regions adjacent to each other along the first direction D1 (refer to Figure 11 ).

[0226] In some embodiments, the color mixing prevention member 370 may include an organic light blocking material and may be provided by coating and exposing the organic light blocking material. For example, in an embodiment, the color mixing prevention member 370 may include a dye or pigment having light blocking properties and may be a black matrix.

[0227] As described above, the filler 70 may be disposed in the space between the color conversion substrate 30 and the display substrate 10. In some embodiments, as Figure 5 shown, the filler 70 may be disposed between the second cover layer 393 and the thin film encapsulation layer 170 and between the color mixing prevention member 370 and the thin film encapsulation layer 170. In some embodiments, the filler 70 may be in direct contact with the second cover layer 393 and the color mixing prevention member 370.

[0228] Figure 14 shows Figure 5 the light transmission spectrum TS1 of the colorant 233b of the second color included in the first color filter 233 shown in Figure 15 shows Figure 5 the light absorption spectrum AS1 and the emission spectrum ES1 of the first wavelength conversion pattern 340 shown in Figure 16 shows Figure 5 an embodiment of the light absorption spectrum TC1 of the first light absorption colorant ca1 included in the first color filter 233 shown in Figure 17 shows Figure 5 an embodiment of the light absorption spectrum TC1' of the first light absorption colorant ca1 included in the first color filter 233 shown in

[0229] In addition to Figure 5 and Figure 8 the following description will also refer to Figures 14 to 17 given.

[0230] Figure 14 The light transmission spectrum TS1 shown in

[0231] shows the light transmission characteristics or light absorption characteristics of the colorant 233b of the second color included in the first color filter 233, and more specifically, shows the relative transmittance of each wavelength.

[0232] In some embodiments, the colorant 233b of the second color absorbs light having a wavelength shorter than the first absorption cut-off wavelength TW1, but transmits some light in the short wavelength region. For example, in an embodiment, the colorant 233b of the second color may transmit light having a wavelength less than about 430 nm.

[0233] Figure 15 The emission spectrum ES1 and the light absorption spectrum AS1 of the first wavelength conversion pattern 340 or the first wavelength shifter 345 are shown.

[0234] The light absorption spectrum AS1 shows the light absorption characteristics of the first wavelength conversion pattern 340 or the first wavelength shifter 345, and more specifically, shows the relative light absorption rate for each wavelength. According to the light absorption spectrum AS1, the first wavelength conversion pattern 340 or the first wavelength shifter 345 may absorb light in a wavelength band shorter than the second absorption cut-off wavelength AW1 and convert the light into light having a relatively longer wavelength.

[0235] The second absorption cut-off wavelength AW1 may be longer than the first absorption cut-off wavelength TW1 of the colorant 233b of the second color. That is, when external light is provided to the display device 1, light having a wavelength range between the first absorption cut-off wavelength TW1 of the colorant 233b of the second color and the second absorption cut-off wavelength AW1 of the first wavelength shifter 345 may pass through the first color filter 233 and then be provided to the first wavelength conversion pattern 340, and a portion of the light passing through the first color filter 233 may be absorbed by the first wavelength conversion pattern 340 or the first wavelength shifter 345. In addition, the first wavelength conversion pattern 340 or the first wavelength shifter 345 may convert the absorbed light into light having a relatively longer wavelength, and the wavelength of the converted light may be between the first emission start wavelength EW1a and the first emission end wavelength EW1b of the emission spectrum ES1.

[0236] In other words, light within the first overlapping wavelength range OW1 (where the light absorption spectrum AS1 of the first wavelength conversion pattern 340 or the first wavelength shifter 345 overlaps with the light transmission spectrum TS1 of the colorant 233b of the second color included in the first color filter 233) may pass through the first color filter 233 and be absorbed by the first wavelength conversion pattern 340, and the absorbed light may be used for light emission of the first wavelength conversion pattern 340.

[0237] In an embodiment, for light transmitted without being absorbed by the colorant 233b of the second color (i.e., the light absorption spectrum AS1 in the range equal to or greater than the first absorption cut-off wavelength TW1), the light absorption spectrum AS1 may have a maximum light absorption characteristic in the range of about 590 nm to about 610 nm.

[0238] The emission spectrum ES1 shows the emission characteristics of the first wavelength conversion pattern 340 or the first wavelength shifter 345. More specifically, it shows the relative light intensity of each wavelength. According to the emission spectrum ES1, the first wavelength conversion pattern 340 or the first wavelength shifter 345 can convert incident light into light with a longer wavelength than the incident light and emit light with a longer wavelength. In some embodiments, the first wavelength conversion pattern 340 or the first wavelength shifter 345 can emit red light with the maximum intensity having a first peak wavelength PW1, and the first peak wavelength PW1 can be about 610 nm to about 650 nm as described above. In addition, the first wavelength conversion pattern 340 or the first wavelength shifter 345 can emit light within the range between a first emission start wavelength EW1a and a first emission end wavelength EW1b among the lights having wavelengths within a range that does not include the first peak wavelength PW1. In some embodiments, the first emission start wavelength EW1a can be a wavelength within the range of about 550 nm to about 600 nm. In some embodiments, the first emission start wavelength EW1a can be a wavelength within the range of about 550 nm to the first absorption end wavelength TW1. In some embodiments, the first emission end wavelength EW1b can be equal to or greater than the second absorption end wavelength AW1.

[0239] Among the lights within the first overlapping wavelength range OW1 where the light absorption spectrum AS1 of the first wavelength shifter 345 overlaps with the light transmission spectrum TS1 of the colorant 233b of the second color included in the first color filter 233, the light within the range less than the first peak wavelength PW1 of the emission spectrum ES1 can be referred to as the light within the second overlapping wavelength range OW1a. The light within the second overlapping wavelength range OW1a can be converted by the first wavelength conversion pattern 340 or the first wavelength shifter 345 into light with a relatively long wavelength, and the converted light can have the first peak wavelength PW1.

[0240] That is, in external light, the light within the second overlapping wavelength range OW1a can be provided to the first wavelength conversion pattern 340 through the first color filter 233, and a part of the light provided to the first wavelength conversion pattern 340 can be absorbed by the first wavelength conversion pattern 340. The second overlapping wavelength range OW1a is equal to or greater than the first absorption end wavelength TW1 of the colorant 233b of the second color and less than the first peak wavelength PW1 of the first wavelength shifter 345. In addition, in external light, the light absorbed by the first wavelength conversion pattern 340 can be wavelength-converted by the first wavelength shifter 345 into light with the maximum intensity having the first peak wavelength PW1 and then emitted. That is, unwanted light may be emitted from the first wavelength conversion pattern 340 due to external light, and the unwanted light may be perceived by the user as a reflection of the external light. Therefore, the display quality may be reduced.

[0241] In some embodiments, the wavelength range in which the optical absorption spectrum AS1 has a maximum optical absorption characteristic within a range equal to or greater than the first absorption termination wavelength TW1 may be included in the second overlapping wavelength range OW1a.

[0242] In some embodiments, the second overlapping wavelength range OW1a may be from about 570 nm to about 650 nm, or may be from about 590 nm to about 610 nm.

[0243] Figure 16 An embodiment showing the optical absorption spectrum TC1 of the first optical absorption colorant ca1 included in the first color filter 233 is shown. More specifically, the optical absorption spectrum TC1 when the first optical absorption colorant ca1 is implemented as a dye is shown.

[0244] In an embodiment, the first optical absorption colorant ca1 may absorb about 60% (60%) or more of the light between the first wavelength AC1a and the second wavelength AC1b, and the maximum absorption wavelength of the first optical absorption colorant ca1 may be included within the wavelength range between the first wavelength AC1a and the second wavelength AC1b.

[0245] In some embodiments, the wavelength range between the first wavelength AC1a and the second wavelength AC1b may be included in the second overlapping wavelength range OW1a, or may be substantially the same as the second overlapping wavelength range OW1a.

[0246] In some embodiments, the light within the wavelength range between the first wavelength AC1a and the second wavelength AC1b may be a short wavelength component of red light, or may be yellow light.

[0247] The first optical absorption colorant ca1 may absorb the light having a wavelength included within the second overlapping wavelength range OW1a among the external light. Accordingly, the light emission of the first wavelength conversion pattern 340 due to the light within the second overlapping wavelength range OW1a among the external light may be prevented or suppressed. In some embodiments, the first wavelength AC1a may be about 590 nm, and the second wavelength AC1b may be about 610 nm. That is, in some embodiments, the first optical absorption colorant ca1 may absorb the light having a wavelength of about 590 nm to about 610 nm.

[0248] Figure 17 An embodiment showing the optical absorption spectrum TC1’ of the first optical absorption colorant ca1 included in the first color filter 233 is shown. More specifically, the optical absorption spectrum TC1’ when the first optical absorption colorant ca1 is implemented as a pigment is shown.

[0249] In an embodiment, the first light-absorbing colorant ca1 may absorb about 60% or more of light having a wavelength shorter than the third wavelength AC1b', and may absorb about 90% or more of light having a wavelength of about 570 nm or shorter. In some embodiments, the third wavelength AC1b' may be substantially the same as the first peak wavelength PW1. In some embodiments, the third wavelength AC1b' may be about 610 nm, and the first light-absorbing colorant ca1 may absorb or block light having a wavelength less than about 610 nm.

[0250] In some embodiments, the second overlapping wavelength range OW1a may be included within a wavelength range less than the third wavelength AC1b'.

[0251] The first light-absorbing colorant ca1 may absorb light having a wavelength included within the second overlapping wavelength range OW1a among external light. Accordingly, light emission of the first wavelength conversion pattern 340 due to light within the second overlapping wavelength range OW1a among external light may be prevented or suppressed.

[0252] In an embodiment, when the first light-absorbing colorant ca1 includes a pigment, the first light-absorbing colorant ca1 may also absorb short-wavelength components of light transmitted through the second-color colorant 233b, such as light of about 430 nm or less. Accordingly, light emission of the first wavelength conversion pattern 340 due to short-wavelength components of light transmitted through the second-color colorant 233b may be prevented or suppressed.

[0253] In some embodiments, as described above, the first light-absorbing colorant ca1 may be a magenta pigment or a magenta dye.

[0254] Figure 18 is a view for explaining an embodiment of the function of the first light-absorbing colorant ca1 in the display device 1.

[0255] In addition to Figures 14 to 17 and also referring to Figure 18 , external light LO may be provided to the color conversion substrate 30 as described above, and may include a red light component LOR, a green light component LOG, and a blue light component LOB.

[0256] In the external light LO incident on the third light-transmitting region TA3, the red light component LOR and the green light component LOG may be blocked by the third color filter 231. In the external light LO incident on the third light-transmitting region TA3, the blue light component LOB may pass through the third color filter 231 and enter the light-transmitting pattern 330.

[0257] In the external light LO incident on the second light-transmitting region TA2, the red light component LOR and the blue light component LOB can be blocked by the second color filter 235. In the external light LO incident on the second light-transmitting region TA2, the green light component LOG can pass through the second color filter 235 and enter the second wavelength conversion pattern 350.

[0258] In the external light LO incident on the first light-transmitting region TA1, the green light component LOG and the blue light component LOB can be blocked by the first color filter 233. In the external light LO incident on the first light-transmitting region TA1, the red light component LOR can pass through the first color filter 233 and enter the first wavelength conversion pattern 340.

[0259] As described above, the short-wavelength band component (also referred to as the "short-wavelength component") of the red light component LOR or the yellow light region component of the red light component LOR can be transmitted through the first color filter 233 without being absorbed by the colorant 233b of the second color (reference Figure 8 ). In addition, the portion of the red light component LOR provided to the first wavelength conversion pattern 340 that is not absorbed by the colorant 233b of the second color (reference Figure 8 ) can be absorbed by the first wavelength conversion pattern 340 or the first wavelength shifter 345 and converted into light having a relatively long wavelength.

[0260] In the red light component LOR incident on the first wavelength shifter 345, the first wavelength shifter 345 can perform wavelength conversion on the wavelength component shorter than the first peak wavelength PW1 of the first wavelength shifter 345. Therefore, unwanted light LE1 may be generated and emitted to the outside through the first light-transmitting region TA1. When the unwanted light LE1 has the first peak wavelength PW1, the user can easily perceive the unwanted light LE1. Therefore, the user can see not only the reflected light of the external light LO but also the light LE1 emitted to the outside through the first light-transmitting region TA1. Therefore, the display quality perceived by the user may be reduced due to the reflection of the external light LO. In addition, the light LE1 emitted to the outside through the first light-transmitting region TA1 is mixed with the light emitted from other light-transmitting regions to display an image. Therefore, the color quality of the displayed image may be reduced due to color mixing.

[0261] In the illustrated embodiment, in addition to the colorant 233b of the second color (reference Figure 8 ), the first color filter 233 further includes a first light-absorbing colorant ca1 (reference Figure 8 ). As described above, the first light-absorbing colorant ca1 (reference Figure 8 ) can absorb or block the light transmitted through the colorant 233b of the second color (reference Figure 8Light having a wavelength that belongs to the wavelength band absorbed by the first wavelength conversion pattern 340 and is shorter than the first peak wavelength PW1 of the first wavelength shifter 345 among the light in the light of (). In particular, the first light absorption colorant ca1 (refer to Figure 8 ) can absorb or block light in the wavelength band that is most absorbed by the first wavelength conversion pattern 340 among the light transmitted through the colorant 233b of the second color (refer to Figure 8 ). Therefore, generation of unwanted light LE1 in the first wavelength shifter 345 due to external light LO can be prevented or suppressed, thereby improving the display quality of the display device 1.

[0262] In addition, among the light that has been converted by the first wavelength shifter 345 from the output light L1 (refer to Figure 5 ) provided by the first light emitting element ED1 (refer to Figure 5 ), light having a first peak wavelength PW1 or greater can be provided to the outside without being absorbed by the colorant 233b of the second color (refer to Figure 8 ) and the first light absorption colorant ca1 of the first color filter 233 (refer to Figure 8 ). Therefore, even when the first color filter 233 further includes the first light absorption colorant ca1 (refer to Figure 8 ), an image of desired quality can be displayed.

[0263] Figure 19 is a cross-sectional view of an embodiment of the display device 1a taken along the line X1 - X1' of Figure 3 and Figure 4 . Figure 20 is Figure 19 an enlarged cross-sectional view of part Q5 of Figure 21 is Figure 19 an enlarged cross-sectional view of part Q6 of

[0264] Refer to Figures 19 to 21 , the display device 1a in the shown embodiment includes a display substrate 10, a color conversion substrate 30a, and a filler 70. In particular, except for the configuration of the color conversion substrate 30a, except that the color conversion substrate 30a includes a first color filter 233 - 1 and a second color filter 235 - 1, the display device 1a is substantially the same as or similar to the embodiment of Figures 5 to 13 . Therefore, redundant descriptions will be omitted, and the differences will be mainly described.

[0265] The first color filter 233 - 1 can transmit only light of the second color (e.g., red light), and block or absorb light of the first color (e.g., blue light) and light of the third color (e.g., green light). That is, in some embodiments, the first color filter 233 - 1 can be a red color filter.

[0266] In some embodiments, asFigure 20 As shown, the first color filter 233-1 may include a base resin 233a and a colorant 233b of a second color provided in the base resin 233a, and is different from Figure 8 the first color filter 233 shown in (refer to Figure 8 ), the first color filter 233-1 may not include the first light-absorbing colorant ca1 (refer to Figure 8 ).

[0267] The base resin 233a and the colorant 233b of the second color are the same as the base resin 233a and the colorant 233b of the second color described above in Figures 5 to 13 , and thus their detailed descriptions are omitted.

[0268] The second color filter 235-1 may block or absorb light of a first color (e.g., blue light). That is, the second color filter 235-1 may also be used as a blue light-blocking filter. In some embodiments, the second color filter 235-1 may only transmit light of a third color (e.g., green light), and block or absorb light of a first color (e.g., blue light) and light of a second color (e.g., red light). That is, in some embodiments, the second color filter 235-1 may be a green color filter.

[0269] In some embodiments, as shown in Figure 21 , the second color filter 235-1 may include a base resin 235a, and a second light-absorbing colorant ca2 and a colorant 235b of a third color provided in the base resin 235a.

[0270] The base resin 235a and the colorant 235b of the third color are the same as the base resin 235a and the colorant 235b of the third color described above in Figures 5 to 13 , and thus their detailed descriptions are omitted.

[0271] The second light-absorbing colorant ca2 may be uniformly dispersed in the base resin 235a. The second light-absorbing colorant ca2 may absorb or block short-wavelength components of the light of the third color (e.g., green light) transmitted through the colorant 235b of the third color. In an alternative embodiment, the second light-absorbing colorant ca2 may block or absorb a combination of short-wavelength components of the light of the third color and light of the first color, e.g., cyan light (a combination of short-wavelength components of green light and blue light). For example, in an embodiment, the second light-absorbing colorant ca2 may be a cyan light-absorbing colorant that absorbs cyan light.

[0272] In some embodiments, the second light-absorbing colorant ca2 may be a yellow colorant, such as a yellow dye or a yellow pigment. For example, in an embodiment, when the yellow colorant applied to the second light-absorbing colorant ca2 is a yellow pigment, C.I. Pigment Yellow 138, C.I. Pigment Yellow 139, C.I. Pigment Yellow 150, C.I. Pigment Yellow 185, etc., among the compounds classified as pigments in the C.I. (published by the Society of Dyers and Colourists), may be applied as the yellow pigment.

[0273] The second light-absorbing colorant ca2 may absorb or block the short-wavelength components of green light among external light that are not blocked by the colorant 235b of the third color, thereby preventing or reducing the light emitted from the second wavelength conversion pattern 350 due to external light. This will be described in more detail later.

[0274] Other elements of the color conversion substrate 30a are substantially the same as those described above in Figures 5 to 13 and thus a detailed description thereof is omitted.

[0275] Figure 22 Shows Figure 19 the light transmission spectrum TS2 of the colorant 235b of the third color included in the second color filter 235-1 shown in Figure 23 Shows Figure 19 the light absorption spectrum AS2 and the emission spectrum ES2 of the second wavelength conversion pattern 350 or the second wavelength shifter 355 shown in Figure 24 Shows Figure 19 an embodiment of the light absorption spectrum TC2 of the second light-absorbing colorant ca2 included in the second color filter 235-1 shown in Figure 25 Shows Figure 19 an embodiment of the light absorption spectrum TC2' of the second light-absorbing colorant ca2 included in the second color filter 235-1 shown in

[0276] In addition to Figures 19 to 21 the following description will also refer to Figures 22 to 25 given.

[0277] Figure 22 The light transmission spectrum TS2 shown in

[0278] The colorant 235b of the third color can transmit light in the green wavelength band and absorb light in other wavelength bands. The colorant 235b of the third color can also transmit the component in the short wavelength region, for example, the component in the cyan light region among the light in the green wavelength band. In some embodiments, the colorant 235b of the third color can transmit light having a wavelength equal to or greater than the first transmission start wavelength TW2a and equal to or less than the first transmission end wavelength TW2b, and absorb light having a wavelength less than the first transmission start wavelength TW2a and light having a wavelength greater than the first transmission end wavelength TW2b. In some embodiments, the first transmission start wavelength TW2a can be between about 450 nm and about 500 nm, and the first transmission end wavelength TW2b can be between about 600 nm and about 650 nm.

[0279] In some embodiments, the first transmission start wavelength TW2a can be about 470 nm to about 490 nm, and the first transmission end wavelength TW2b can be about 610 nm to about 630 nm.

[0280] Figure 23 The emission spectrum ES2 and the light absorption spectrum AS2 of the second wavelength conversion pattern 350 or the second wavelength shifter 355 are shown.

[0281] The light absorption spectrum AS2 shows the light absorption characteristics of the second wavelength conversion pattern 350 or the second wavelength shifter 355, and more specifically, shows the relative light absorption rate of each wavelength. According to the light absorption spectrum AS2, the second wavelength conversion pattern 350 or the second wavelength shifter 355 can absorb light in the wavelength band shorter than the third absorption end wavelength AW2, and convert the light into light having a relatively long wavelength. The third absorption end wavelength AW2 can be longer than the first transmission start wavelength TW2a of the colorant 235b of the third color and shorter than the first transmission end wavelength TW2b. That is, when external light is provided to the display device 1a, light having a wavelength range between the first transmission start wavelength TW2a of the colorant 235b of the third color and the third absorption end wavelength AW2 of the second wavelength shifter 355 can pass through the second color filter 235-1, and then be provided to the second wavelength conversion pattern 350, and a part of the light passing through the second color filter 235-1 can be absorbed by the second wavelength conversion pattern 350 or the second wavelength shifter 355. In addition, the second wavelength conversion pattern 350 or the second wavelength shifter 355 can convert the absorbed light into light having a relatively long wavelength, and the wavelength of the converted light can be between the second emission start wavelength EW2a and the second emission end wavelength EW2b of the emission spectrum ES2.

[0282] In other words, light within the third overlapping wavelength range OW2 (where the light absorption spectrum AS2 of the second wavelength conversion pattern 350 or the second wavelength shifter 355 overlaps with the light transmission spectrum TS2 of the second color filter 235-1) can pass through the second color filter 235-1 and be absorbed by the second wavelength conversion pattern 350, and the absorbed light can be used for light emission by the second wavelength conversion pattern 350. In an embodiment, for light that is transmitted without being absorbed by the colorant 235b of the third color (i.e., light within the light absorption spectrum AS2 in a range equal to or greater than the first transmission start wavelength TW2a), the light absorption spectrum AS2 can have a maximum light absorption characteristic in a range of about 490 nm to about 530 nm.

[0283] The emission spectrum ES2 shows the emission characteristics of the second wavelength conversion pattern 350 or the second wavelength shifter 355, and more specifically, shows the relative light intensity at each wavelength. According to the emission spectrum ES2, the second wavelength conversion pattern 350 or the second wavelength shifter 355 can convert incident light into light having a longer wavelength than the incident light and emit the light having the longer wavelength. In some embodiments, the second wavelength conversion pattern 350 or the second wavelength shifter 355 can emit green light having the maximum intensity, that is, green light having the second peak wavelength PW2, and the second peak wavelength PW2 can be about 530 nm to about 570 nm as described above. In addition, the second wavelength conversion pattern 350 or the second wavelength shifter 355 can emit light within the range between the second emission start wavelength EW2a and the second emission end wavelength EW2b among the light having wavelengths in a range that does not include the second peak wavelength PW2. In some embodiments, the second emission start wavelength EW2a can be a wavelength in a range of about 450 nm to about 470 nm. In some embodiments, the second emission start wavelength EW2a can be a wavelength in a range of about 450 nm to the first transmission start wavelength TW2a. In some embodiments, the second emission end wavelength EW2b can be equal to or greater than the first transmission end wavelength TW2b.

[0284] Among the light within the third overlapping wavelength range OW2 where the light absorption spectrum AS2 of the second wavelength shifter 355 overlaps with the light transmission spectrum TS2 of the second color filter 235-1, the light within a range less than the second peak wavelength PW2 of the emission spectrum ES2 can be referred to as the light within the fourth overlapping wavelength range OW2a. The light within the fourth overlapping wavelength range OW2a can be converted by the second wavelength conversion pattern 350 or the second wavelength shifter 355 into light having a relatively long wavelength, and the converted light can have the second peak wavelength PW2.

[0285] That is, in external light, light within the fourth overlapping wavelength range OW2a can be provided to the second wavelength conversion pattern 350 through the second color filter 235-1. The fourth overlapping wavelength range OW2a is equal to or greater than the first transmission start wavelength TW2a of the colorant 235b of the third color and less than the second peak wavelength PW2 of the second wavelength shifter 355. In external light, the light provided to the second wavelength conversion pattern 350 can be absorbed by the second wavelength conversion pattern 350. Further, the light absorbed by the second wavelength conversion pattern 350 can be wavelength-converted by the second wavelength shifter 355 into light having the second peak wavelength PW2 with the maximum intensity, and then can be emitted. That is, unwanted light may be emitted from the second wavelength conversion pattern 350 due to external light, and this unwanted light can be perceived by the user as a reflection of the external light. Accordingly, the display quality may be degraded.

[0286] In some embodiments, the wavelength range in which the light absorption spectrum AS2 has the maximum light absorption characteristic in the range equal to or greater than the first transmission start wavelength TW2a may be included in the fourth overlapping wavelength range OW2a.

[0287] In some embodiments, the fourth overlapping wavelength range OW2a may be from about 470 nm to about 550 nm, or may be from about 490 nm to about 530 nm.

[0288] Figure 24 An embodiment showing the light absorption spectrum TC2 of the second light absorption colorant ca2 included in the second color filter 235-1 is shown. More specifically, the light absorption spectrum TC2 when the second light absorption colorant ca2 is implemented as a dye is shown.

[0289] In an embodiment, the second light absorption colorant ca2 may absorb about 60% or more of light having a wavelength equal to or greater than the fourth wavelength AC2a and less than the fifth wavelength AC2b, and the maximum absorption wavelength of the second light absorption colorant ca2 may be included in the wavelength range between the fourth wavelength AC2a and the fifth wavelength AC2b.

[0290] In some embodiments, the wavelength range between the fourth wavelength AC2a and the fifth wavelength AC2b may be included in the fourth overlapping wavelength range OW2a, or may be substantially the same as the fourth overlapping wavelength range OW2a.

[0291] In some embodiments, the light in the wavelength range between the fourth wavelength AC2a and the fifth wavelength AC2b may be a short wavelength component of green light, or may be cyan light.

[0292] The second light absorption colorant ca2 can absorb light having a wavelength included in the fourth overlapping wavelength range OW2a among external light. Accordingly, light emission of the second wavelength conversion pattern 350 caused by light within the fourth overlapping wavelength range OW2a among external light can be prevented or suppressed. In some embodiments, the fourth wavelength AC2a may be about 490 nm. In some embodiments, the fifth wavelength AC2b may be substantially the same as the second peak wavelength PW2. For example, the fifth wavelength AC2b may be about 530 nm. That is, in some embodiments, the second light absorption colorant ca2 can absorb light having a wavelength of about 490 nm to about 530 nm.

[0293] Figure 25 An embodiment of the light absorption spectrum TC2’ of the second light absorption colorant ca2 included in the second color filter 235-1 is shown. More specifically, the light absorption spectrum TC2’ when the second light absorption colorant ca2 is implemented as a pigment is shown.

[0294] In an embodiment, the second light absorption colorant ca2 can absorb about 60% or more of light having a wavelength shorter than the sixth wavelength AC2b’, and can absorb about 90% or more of light having a wavelength of about 500 nm or shorter. In some embodiments, the sixth wavelength AC2b’ may be substantially the same as the second peak wavelength PW2 and may be, for example, about 530 nm. That is, in some embodiments, the second light absorption colorant ca2 can absorb or block light having a wavelength less than about 530 nm.

[0295] In some embodiments, the fourth overlapping wavelength range OW2a may be included in a wavelength range less than the sixth wavelength AC2b’.

[0296] In some embodiments, as described above, the second light absorption colorant ca2 may be a yellow colorant, such as a yellow pigment or a yellow dye.

[0297] Figure 26 is a view for explaining an embodiment of the function of the second light absorption colorant ca2 in the display device 1a.

[0298] In addition to Figures 19 to 25 also referring to Figure 26 , external light LO may be provided to the color conversion substrate 30a as described above, and may include a red light component LOR, a green light component LOG, and a blue light component LOB.

[0299] In the external light LO incident on the third light-transmitting region TA3, the red light component LOR and the green light component LOG can be blocked by the third color filter 231. In the external light LO incident on the third light-transmitting region TA3, the blue light component LOB can pass through the third color filter 231 and enter the light-transmitting pattern 330.

[0300] In the external light LO incident on the first light-transmitting region TA1, the green light component LOG and the blue light component LOB can be blocked by the first color filter 233-1. In the external light LO incident on the first light-transmitting region TA1, the red light component LOR can pass through the first color filter 233-1 and enter the first wavelength conversion pattern 340.

[0301] In the external light LO incident on the second light-transmitting region TA2, the red light component LOR and the blue light component LOB can be blocked by the second color filter 235-1. In the external light LO incident on the second light-transmitting region TA2, the green light component LOG can pass through the second color filter 235-1 and enter the second wavelength conversion pattern 350.

[0302] As described above, the short-wavelength band component (also referred to as the "short-wavelength component") of the green light component LOG or the cyan light region component of the green light component LOG can be transmitted through the second color filter 235-1 without being absorbed by the colorant 235b of the third color of the second color filter 235-1 (refer to Figure 21 ). In addition, the green light component LOG provided to the second wavelength conversion pattern 350 without being absorbed by the colorant 235b of the third color (refer to Figure 21 ) can be absorbed by the second wavelength conversion pattern 350 and used for the light emission of the second wavelength shifter 355.

[0303] In the green light component LOG incident on the second wavelength shifter 355, the second wavelength shifter 355 can perform wavelength conversion on the wavelength component shorter than the second peak wavelength PW2 of the second wavelength shifter 355. Therefore, unwanted light LE2 may be generated and emitted to the outside through the second light-transmitting region TA2. When the unwanted light LE2 has the second peak wavelength PW2, the user can easily perceive the unwanted light LE2. Therefore, the user can not only see the reflected light of the external light LO, but also see the light LE2 emitted to the outside through the second light-transmitting region TA2. Therefore, the display quality perceived by the user may be reduced due to the reflection of the external light LO. In addition, the light LE2 emitted to the outside through the second light-transmitting region TA2 is mixed with the light emitted from other light-transmitting regions to display an image. Therefore, the color quality of the displayed image may be reduced due to color mixing.

[0304] In the illustrated embodiment, in addition to the colorant 235b of the third color (refer to Figure 21) In addition to the above, the second color filter 235-1 further includes a second light-absorbing colorant ca2 (refer to Figure 21 ). As described above, the second light-absorbing colorant ca2 (refer to Figure 21 ) can absorb or block light having a wavelength band absorbed by the second wavelength conversion pattern 350 and having a wavelength shorter than the second peak wavelength PW2 among the light transmitted through the colorant 235b (refer to Figure 21 ) of the third color. In particular, the second light-absorbing colorant ca2 (refer to Figure 21 ) can absorb or block light in the wavelength band that is most absorbed by the second wavelength conversion pattern 350 among the light transmitted through the colorant 235b (refer to Figure 21 ) of the third color. Therefore, the generation of unwanted light LE2 in the second wavelength shifter 355 due to the external light LO can be prevented or suppressed, thereby improving the display quality of the display device 1a.

[0305] In addition, among the light that has been converted by the second wavelength shifter 355 from the output light L1 (refer to Figure 19 ) provided by the second light-emitting element ED2 (refer to [[ID= ), the light having a second peak wavelength PW2 or greater can be provided to the outside without being absorbed by the colorant 235b (refer to ​ ) of the third color and the second light-absorbing colorant ca2 (refer to ​ ) of the second color filter 235-1. Therefore, even when the second color filter 235-1 further includes the second light-absorbing colorant ca2 (refer to ​ ), an image of desired quality can be displayed.

[0306] ​ is a cross-sectional view of an embodiment of the display device 1b taken along the line X1-X1' of ​ and ​ . ​ is a view for explaining the functions of the first light-absorbing colorant ca1 and the second light-absorbing colorant ca2 in the display device 1b.

[0307] Refer to ​ and ​ , the display device 1b in the shown embodiment includes a display substrate 10, a color conversion substrate 30b, and a filler 70. In particular, except for the configuration of the color conversion substrate 30b, that is, except that the color conversion substrate 30b includes the first color filter 233 and the second color filter 235-1, the display device 1b is substantially the same as or similar to the ​ embodiment.

[0308] The first color filter 233 is the same as the one described above in ​is substantially the same as the first color filter 233 described in, and the second color filter 235-1 is substantially the same as the second color filter 235-1 described above in ​ .

[0309] Other elements of the display device 1b are substantially the same as those described above in ​ , and thus a detailed description thereof will be omitted.

[0310] Refer to ​ , in the color conversion substrate 30b in the illustrated embodiment, the first color filter 233 includes not only a base resin 233a (refer to ​ ) and a colorant 233b of a second color (refer to ​ ), but also a first light-absorbing colorant ca1 (refer to ​ ). In addition, the second color filter 235-1 includes not only a base resin 235a (refer to ​ ) and a colorant 235b of a third color (refer to ​ ), but also a second light-absorbing colorant ca2 (refer to ​ ).

[0311] Therefore, it is possible to prevent or suppress the first wavelength shifter 345 from emitting unnecessary light LE1 in the first light-transmitting region TA1 due to the red light component LOR of the external light LO. In addition, it is possible to prevent or suppress the second wavelength shifter 355 from emitting unnecessary light LE2 in the second light-transmitting region TA2 due to the green light component LOG of the external light LO. Therefore, the display quality of the display device 1b can also be improved.

[0312] ​ is a cross-sectional view of an embodiment of the display device 2 taken along the line X1-X1' of ​ and ​ . ​ is ​ an enlarged cross-sectional view of a portion R1 of

[0313] Refer to ​ and ​ , the display device 2 in the illustrated embodiment includes a display substrate 10, a color conversion substrate 31, and a filler 70. In particular, except for the configuration of the color conversion substrate 31, except that the color conversion substrate 31 includes a first color filter 233-1 and a first light-absorbing layer 243, the display device 2 is substantially the same as or similar to the embodiment of ​ . Therefore, redundant descriptions will be omitted, and the differences will be mainly described.

[0314] The first color filter 233-1 may include a base resin 233a and a colorant 233b of a second color. The first color filter 233-1 is the same as the one described above in​ is the same as the first color filter 233-1 described above, and thus a more detailed description thereof is omitted.

[0315] The first light absorption layer 243 may be disposed on the surface of the second substrate 310. In some embodiments, the first light absorption layer 243 may overlap with the first light-transmitting region TA1 or the first light-emitting region LA1, and may be disposed between the second substrate 310 and the first color filter 233-1. That is, the first color filter 233-1 may be disposed between the first wavelength conversion pattern 340 and the first light absorption layer 243.

[0316] The first light absorption layer 243 may include a base resin 243a and a first light absorption colorant ca1 disposed in the base resin 243a.

[0317] In some embodiments, the base resin 243a may be an organic material and may be a photocurable resin. In some embodiments, the base resin 243a may be an organic material having light-transmitting properties.

[0318] The first light absorption colorant ca1 may be uniformly dispersed in the base resin 243a. The first light absorption colorant ca1 may absorb or block short-wavelength components of red light that can be transmitted through the colorant 233b of the second color.

[0319] In some embodiments, the first light absorption colorant ca1 may be a magenta colorant, such as a magenta dye or a magenta pigment. The first light absorption colorant ca1 may block or absorb components of external light that may cause the first wavelength shifter 345 to emit light without being absorbed by the colorant 233b of the second color and the first wavelength conversion pattern 340. Therefore, the first wavelength shifter 345 can be prevented or inhibited from emitting light in the first light-transmitting region TA1 due to external light.

[0320] Other details of the first light absorption colorant ca1 are substantially the same or similar to those of the first light absorption colorant ca1 described above ​ and thus a description thereof is omitted.

[0321] ​ is a cross-sectional view of an embodiment of the display device 2a taken along the line X1-X1' of ​ and ​

[0322] Refer to ​ ​, the display device 2a in the illustrated embodiment includes a display substrate 10, a color conversion substrate 31a, and a filler 70. In particular, except for the configuration of the color conversion substrate 31a, the display device 2a is substantially the same as or similar to the embodiments of ​ and ​ , so the detailed description is omitted.

[0323] ​ is a cross-sectional view of an embodiment of the display device 2b taken along the line X1-X1' of ​ and ​ .

[0324] Referring to ​ , the display device 2b in the illustrated embodiment includes a display substrate 10, a color conversion substrate 31b, and a filler 70. In particular, except for the configuration of the color conversion substrate 31b, the display device 2b is substantially the same as or similar to the embodiments of ​ and ​ , so the detailed description will be omitted, and the differences will be mainly described.

[0325] The first light absorption layer 243-1 may be provided over the entire surface of the second substrate 310. That is, the first light absorption layer 243-1 may also be provided between the third color filter 231 and the second substrate 310 in the third light transmissive region TA3, and may also be provided between the second color filter 235 and the second substrate 310 in the second light transmissive region TA2. That is, the third color filter 231 may be provided between the light transmissive pattern 330 and the first light absorption layer 243-1 in the third light transmissive region TA3, and the second color filter 235 may be provided between the second wavelength conversion pattern 350 and the first light absorption layer 243-1 in the second light transmissive region TA2.

[0326] The first light absorption layer 243-1 may also be provided between the first color pattern 251 and the second substrate 310 in the first light blocking region BA1, may also be provided between the second color pattern 252 and the second substrate 310 in the second light blocking region BA2, and may also be provided between the third color pattern 253 and the second substrate 310 in the third light blocking region BA3.

[0327] The first light absorption layer 243-1 includes as described above in ​ and​ the base resin 243a described in the embodiment of (refer to ​ ) and the first light-absorbing colorant ca1 (refer to ​ ).

[0328] In some embodiments, the first light-absorbing colorant ca1 included in the first light-absorbing layer 243-1 (refer to ​ ) may be a dye, and more specifically, a magenta dye.

[0329] When the first light-absorbing colorant ca1 included in the first light-absorbing layer 243-1 (refer to ​ ) is a magenta dye, the first light-absorbing colorant ca1 may have the light absorption spectrum TC1 described above in ​ (refer to ​ ), and may transmit light in the green wavelength band and light in the blue wavelength band.

[0330] Therefore, even when the first light-absorbing layer 243-1 is provided not only in the first light-transmitting region TA1 but also in the second light-transmitting region TA2 and the third light-transmitting region TA3, green light, which is the third light Lc, can be provided to the outside in the second light-transmitting region TA2, and blue light, which is the first light La, can be provided to the outside in the third light-transmitting region TA3.

[0331] ​ is a cross-sectional view of an embodiment of the display device 2c taken along the line X1-X1' of ​ and ​ .

[0332] Refer to ​ , the display device 2c in the shown embodiment includes a display substrate 10, a color conversion substrate 31c, and a filler 70. The display device 2c is different from the embodiment of ​ in the configuration of the color conversion substrate 31c, and in particular, in that the first light-absorbing layer 243-1 of the color conversion substrate 31c is provided over the entire other surface of the second substrate 310. Here, the other surface of the second substrate 310 means the surface opposite to the surface of the second substrate 310 on which the first color filter 233-1 is provided. The description of each element of the display device 2c (in particular, the detailed description of the first light-absorbing layer 243-1) is the same as the description given in the embodiment of ​ above, and is thus omitted.

[0333] ​ is a cross-sectional view of an embodiment of the display device 2d taken along the line X1-X1' of ​ and ​ . ​ is ​Enlarged cross-sectional view of part R2.

[0334] Reference ​ and ​ In the embodiment shown, the display device 2d includes a display substrate 10, a color conversion substrate 31d, and a filler 70. Except for the configuration of the color conversion substrate 31d, in particular, except that the color conversion substrate 31d includes a second color filter 235 and a second light absorption layer 245, the display device 2d is substantially the same as or similar to ​ the embodiment of . Therefore, redundant descriptions will be omitted, and the differences will be mainly described.

[0335] The second color filter 235 may include a base resin 235a and a colorant 235b of a third color. The second color filter 235 is the same as the second color filter 235 described above in ​ and thus a more detailed description thereof is omitted.

[0336] The second light absorption layer 245 may be disposed on the surface of the second substrate 310. In some embodiments, the second light absorption layer 245 may overlap with the second light transmissive region TA2 or the second light emitting region LA2, and may be disposed between the second substrate 310 and the second color filter 235.

[0337] The second light absorption layer 245 may include a base resin 245a and a second light absorption colorant ca2 disposed in the base resin 245a.

[0338] In some embodiments, the base resin 245a may be an organic material and may be a photocurable resin. In some embodiments, the base resin 245a may be an organic material having light transmissive properties.

[0339] The second light absorption colorant ca2 may be uniformly dispersed in the base resin 245a. The second light absorption colorant ca2 may absorb or block short wavelength components of red light that can be transmitted through the colorant 235b of the third color.

[0340] In some embodiments, the second light absorption colorant ca2 may be a yellow colorant, such as a yellow dye or a yellow pigment. The second light absorption colorant ca2 may block or absorb components of external light that may cause the second wavelength shifter 355 to emit light without being absorbed by the colorant 235b of the third color and the second wavelength conversion pattern 350. Therefore, emission of light by the second wavelength shifter 355 in the second light transmissive region TA2 due to external light can be prevented or suppressed.

[0341] Other details of the second light absorption colorant ca2 and the function of the second light absorption colorant ca2 are the same as those described above in ​The details and functions of the second light absorption colorant ca2 described in [reference] are basically the same or similar, and thus the description thereof is omitted.

[0342] ​ is a cross-sectional view of an embodiment of the display device 2e taken along the line X1-X1' of ​ and ​ .

[0343] Refer to ​ . In the embodiment shown, the display device 2e includes a display substrate 10, a color conversion substrate 31e, and a filler 70. Except for the configuration of the color conversion substrate 31e, in particular, except that the second color filter 235 of the color conversion substrate 31e is provided between the second light absorption layer 245 and the second substrate 310 and a part of the second light absorption layer 245 may overlap with the second light blocking region BA2 and the third light blocking region BA3, the display device 2e is substantially the same or similar to the embodiments of ​ and ​ . Therefore, the detailed description is omitted.

[0344] ​ is a cross-sectional view of an embodiment of the display device 2f taken along the line X1-X1' of ​ and ​ .

[0345] Refer to ​ . In the embodiment shown, the display device 2f includes a display substrate 10, a color conversion substrate 31f, and a filler 70. Except for the configuration of the color conversion substrate 31f, in particular, except that the second light absorption layer 245-1 of the color conversion substrate 31f is provided over the entire surface of the second substrate 310, the display device 2f is substantially the same or similar to the embodiments of ​ and ​ . Therefore, the detailed description will be omitted, and the differences will be mainly described.

[0346] The second light absorption layer 245-1 may be provided over the entire surface of the second substrate 310. That is, the second light absorption layer 245-1 may also be provided between the third color filter 231 and the second substrate 310 in the third light transmission region TA3, and may also be provided between the first color filter 233-1 and the second substrate 310 in the first light transmission region TA1. In addition, the second light absorption layer 245-1 may also be provided between the first color pattern 251 and the second substrate 310 in the first light blocking region BA1, may also be provided between the second color pattern 252 and the second substrate 310 in the second light blocking region BA2, and may also be provided between the third color pattern 253 and the second substrate 310 in the third light blocking region BA3.

[0347] The second light absorption layer 245-1 includes a base resin 245a as described above in the ​ and ​ embodiments (refer to ​ ) and a second light absorption colorant ca2 (refer to ​ ).

[0348] In some embodiments, the second light absorption colorant ca2 included in the second light absorption layer 245-1 (refer to ​ ) may be a dye, more specifically, a yellow dye.

[0349] When the second light absorption colorant ca2 included in the second light absorption layer 245-1 (refer to ​ ) is a yellow dye, the second light absorption colorant ca2 may have the light absorption spectrum TC2 as described above in ​ (refer to ​ ), and may transmit light in the red wavelength band and light in the blue wavelength band.

[0350] Therefore, even when the second light absorption layer 245-1 is provided not only in the second light transmission region TA2 but also in the first light transmission region TA1 and the third light transmission region TA3, red light as the second light Lb can be provided to the outside in the first light transmission region TA1, and blue light as the first light La can be provided to the outside in the third light transmission region TA3.

[0351] ​ is a cross-sectional view of an embodiment of the display device 2g taken along the line X1-X1' of ​ and ​ .

[0352] Refer to ​ , the display device 2g in the shown embodiment includes a display substrate 10, a color conversion substrate 31g, and a filler 70. The display device 2g is different from the ​ embodiment in the configuration of the color conversion substrate 31g, particularly, in that the second light absorption layer 245-1 of the color conversion substrate 31g is provided over the entire other surface of the second substrate 310. Here, the other surface of the second substrate 310 means the surface opposite to the surface of the second substrate 310 on which the second color filter 235 is provided. The description of each element of the display device 2g, particularly, the detailed description of the second light absorption layer 245-1 is the same as that given in the ​ embodiment above, and thus is omitted.

[0353] ​ is a cross-sectional view of the display device 2h taken along the line X1-X1' of ​ and ​ .

[0354] Reference ​ , the display device 2h in the illustrated embodiment includes a display substrate 10, a color conversion substrate 31h, and a filler 70. In particular, except for the configuration of the color conversion substrate 31h, except that the color conversion substrate 31h includes a second light absorption layer 245 disposed between the second substrate 310 and the second color filter 235, the display device 2h is the same as or similar to ​ and ​ embodiments. In addition, the second light absorption layer 245 is substantially the same as the second light absorption layer 245 described above in ​ and ​ . Therefore, redundant descriptions are omitted.

[0355] ​ is a cross-sectional view of an embodiment of the display device 2i taken along the line X1-X1' of ​ and ​ .

[0356] Reference ​ , the display device 2i in the illustrated embodiment includes a display substrate 10, a color conversion substrate 31i, and a filler 70. In particular, except for the configuration of the color conversion substrate 31i, except that the color conversion substrate 31i further includes a second light absorption layer 245 and the second color filter 235 is disposed between the second substrate 310 and the second light absorption layer 245, the display device 2i is the same as or similar to ​ embodiments. In addition, the second light absorption layer 245 is substantially the same as the second light absorption layer 245 described above in ​ . Therefore, redundant descriptions are omitted.

[0357] The display device according to the above embodiment can reduce the detection of reflected light caused by external light, reduce color distortion, and improve display quality.

[0358] Through the embodiments of the present invention, a display device with improved display quality can be provided.

[0359] However, the effects of the embodiments are not limited to the effects described herein. By referring to the claims, the above and other effects of the embodiments will become more apparent to those of ordinary skill in the art to which the embodiments pertain.

[0360] At the end of the detailed description, those skilled in the art will understand that many variations and modifications can be made to the preferred embodiments without substantially departing from the principles of the present invention. Therefore, the disclosed preferred embodiments of the present invention are used only in a general and descriptive sense and not for the purpose of limitation.

Claims

1. A display device, comprising: a substrate including a first light-emitting region; a first light-emitting element disposed on the substrate, overlapping with the first light-emitting region, and emitting light of a first color; a first wavelength conversion pattern disposed on the first light-emitting element, overlapping with the first light-emitting element, and wavelength-converting the light of the first color into light of a second color; and a first color filter disposed on the first wavelength conversion pattern, overlapping with the first wavelength conversion pattern, and including a first light-absorbing colorant and a colorant of the second color, wherein the colorant of the second color blocks transmission of the light of the first color and transmits the light of the second color, wherein the colorant of the second color transmits light within a first overlapping wavelength range, within which a first emission spectrum of the first wavelength conversion pattern overlaps with a first light absorption spectrum of the first wavelength conversion pattern, and wherein the first light-absorbing colorant absorbs the light within the first overlapping wavelength range.

2. The display device according to claim 1, wherein, The first light-absorbing colorant absorbs light having a wavelength shorter than a first peak wavelength of the first emission spectrum, and wherein the first light-absorbing colorant transmits light having a wavelength equal to or greater than the first peak wavelength among the light having wavelengths within the first overlapping wavelength range.

3. The display device according to claim 2, wherein, The first light-absorbing colorant transmits light having a wavelength shorter than the wavelengths within the first overlapping wavelength range.

4. The display device according to claim 2, wherein, The first light-absorbing colorant also absorbs light having a wavelength shorter than the wavelengths within the first overlapping wavelength range.

5. The display device according to claim 1, wherein: the light of the first color is blue light, the light of the second color is red light, the colorant of the second color is a red colorant that blocks the blue light and the green light and transmits the red light, and the first light-absorbing colorant absorbs yellow light.

6. The display device according to claim 5, wherein, The first light-absorbing colorant is a magenta colorant.

7. The display device according to claim 5, wherein, The first light-absorbing colorant absorbs light having a wavelength of 590 nanometers to 610 nanometers.

8. The display device according to claim 1, wherein: the light of the first color is blue light, the light of the second color is green light, the colorant of the second color is a green colorant that blocks the blue light and the red light and transmits the green light, and the first light-absorbing colorant absorbs cyan light.

9. The display device according to claim 8, wherein, The first light-absorbing colorant is a yellow colorant.

10. The display device according to claim 8, wherein, The first light-absorbing colorant absorbs light having a wavelength of 490 nanometers to 530 nanometers.

11. The display device according to claim 1, wherein, The substrate further includes a second light-emitting region, and the display device further includes: a second light-emitting element disposed on the substrate, overlapping with the second light-emitting region, and emitting the light of the first color; a second wavelength conversion pattern disposed on the second light-emitting element, overlapping with the second light-emitting element, and including a second wavelength shifter that wavelength-converts the light of the first color into light of a third color; and A second color filter, disposed on the second wavelength conversion pattern, overlapping with the second wavelength conversion pattern, and including a second light-absorbing colorant and a colorant of the third color, wherein the colorant of the third color blocks transmission of the light of the first color and the light of the second color, and transmits the light of the third color, wherein the colorant of the third color transmits light in a second overlapping wavelength range, and the second light-absorbing colorant absorbs the light in the second overlapping wavelength range, in which a second emission spectrum of the second wavelength conversion pattern overlaps with a second light absorption spectrum of the second wavelength conversion pattern.

12. The display device according to claim 11, wherein, The second light-absorbing colorant absorbs light having a wavelength shorter than a second peak wavelength of the second emission spectrum, and wherein the second light-absorbing colorant transmits light among the light in the second overlapping wavelength range having a wavelength equal to or greater than the second peak wavelength.

13. The display device according to claim 11, wherein: the light of the first color is blue light, the light of the second color is red light, the light of the third color is green light, the colorant of the second color is a red colorant, the red colorant blocks the blue light and the green light and transmits the red light, the colorant of the third color is a green colorant, the green colorant blocks the blue light and the red light and transmits the green light, the first light-absorbing colorant absorbs yellow light, and the second light-absorbing colorant absorbs cyan light.

14. The display device according to claim 13, wherein, The first light-absorbing colorant absorbs light in a range of 590 nanometers to 610 nanometers, and the second light-absorbing colorant absorbs light in a range of 490 nanometers to 530 nanometers.

15. The display device according to claim 13, wherein, The first light-absorbing colorant is a magenta colorant, and the second light-absorbing colorant is a yellow colorant.

16. The display device according to claim 11, wherein, The substrate further includes a third light-emitting region, and the display device further includes: a third light-emitting element, disposed on the substrate, overlapping with the third light-emitting region, and emitting the light of the first color; a light-transmitting pattern, disposed on the third light-emitting element; and a third color filter, disposed on the light-transmitting pattern; wherein the third color filter includes the colorant of the first color, and the colorant of the first color transmits the light of the first color and blocks the light of the second color and the light of the third color.

17. A display device, comprising: a substrate, including a first light-emitting region; a first light-emitting element, disposed on the substrate, overlapping with the first light-emitting region, and emitting light of a first color; a first wavelength conversion pattern, disposed on the first light-emitting element, overlapping with the first light-emitting element, and including a first wavelength shifter that wavelength-converts the light of the first color into light of a second color; A first color filter is disposed on the first wavelength conversion pattern, overlapping with the first wavelength conversion pattern, and includes a colorant of the second color, the colorant of the second color blocking transmission of the light of the first color and transmitting the light of the second color; and A first light absorption layer is disposed on the first wavelength conversion pattern, overlapping with the first color filter, and includes a first light absorption colorant, wherein the colorant of the second color transmits light in a first overlapping wavelength range, in which a first emission spectrum of the first wavelength conversion pattern overlaps with a first light absorption spectrum of the first wavelength conversion pattern, and wherein the first light absorption colorant absorbs the light in the first overlapping wavelength range.

18. The display device according to claim 17, wherein, The first light absorption colorant absorbs light having a wavelength shorter than a first peak wavelength of the first emission spectrum, and wherein the first light absorption colorant transmits light among the light in the first overlapping wavelength range having a wavelength equal to or greater than the first peak wavelength.

19. The display device according to claim 17, wherein, The first light absorption layer is disposed between the first wavelength conversion pattern and the first color filter.

20. The display device according to claim 17, wherein The first color filter is disposed between the first wavelength conversion pattern and the first light absorption layer.

21. The display device according to claim 20, wherein, The substrate further includes a second light emitting region, and the display device further includes: A second light emitting element is disposed on the substrate, overlapping with the second light emitting region, and emits the light of the first color; A second wavelength conversion pattern is disposed on the second light emitting element, overlapping with the second light emitting element, and includes a second wavelength shifter that wavelength-converts the light of the first color into light of a third color; and A second color filter is disposed on the second wavelength conversion pattern, overlapping with the second wavelength conversion pattern, and includes a colorant of the third color, wherein the first light absorption layer also overlaps with the second light emitting region, wherein the second color filter is disposed between the second wavelength conversion pattern and the first light absorption layer in the second light emitting region, and wherein the first light absorption colorant transmits the light of the first color and the light of the third color.

22. The display device according to claim 21, wherein, The substrate further includes a third light emitting region, and the display device further includes: A third light emitting element is disposed on the substrate, overlapping with the third light emitting region, and emits the light of the first color; A light transmissive pattern is disposed on the third light emitting element; and A third color filter is disposed on the light transmissive pattern; wherein the third color filter includes a colorant of the first color, the colorant of the first color transmitting the light of the first color and blocking the light of the second color and the light of the third color, wherein the first light absorption layer also overlaps with the third light emitting region, and wherein the third color filter is disposed between the light transmissive pattern and the first light absorption layer in the third light emitting region.

23. The display device according to claim 17, wherein The substrate further includes a second light emitting region, and the display device further includes: A second light-emitting element, disposed on the substrate, overlapping with the second light-emitting region, and emitting the light of the first color; A second wavelength conversion pattern, disposed on the second light-emitting element, overlapping with the second light-emitting element, and including a second wavelength shifter that wavelength-converts the light of the first color into light of a third color; A second color filter, disposed on the second wavelength conversion pattern, overlapping with the second wavelength conversion pattern, and including a colorant of the third color, the colorant of the third color blocking transmission of the light of the first color and the light of the second color, and transmitting the light of the third color; and A second light absorption layer, disposed on the second wavelength conversion pattern, overlapping with the second color filter, and including a second light absorption colorant, wherein the colorant of the third color transmits light in a second overlapping wavelength range, in which a second emission spectrum of the second wavelength conversion pattern overlaps with a second light absorption spectrum of the second wavelength conversion pattern, and wherein the second light absorption colorant absorbs the light in the second overlapping wavelength range.

24. The display device according to claim 23, wherein: the light of the first color is blue light, the light of the second color is red light, the light of the third color is green light, the colorant of the second color is a red colorant, the red colorant blocking the blue light and the green light and transmitting the red light, the colorant of the third color is a green colorant, the green colorant blocking the blue light and the red light and transmitting the green light, the first light absorption colorant absorbs yellow light, and the second light absorption colorant absorbs cyan light.

25. The display device according to claim 24, wherein, the first light absorption colorant absorbs light in the range of 590 nanometers to 610 nanometers, and wherein the second light absorption colorant absorbs light in the range of 490 nanometers to 530 nanometers.

26. The display device according to claim 24, wherein, the first light absorption colorant is a magenta colorant, and wherein the second light absorption colorant is a yellow colorant.

Images