Display device

Abstract

A display device is provided. The display device includes: a first substrate including at least one light emitting element; a second substrate facing the first substrate, wherein light emitted from the light emitting element is incident on the second substrate; and a filling layer located between the first substrate and the second substrate, wherein the filling layer includes a filling pattern including a first pattern portion located on the first substrate and having a curved portion formed in at least a portion thereof.

Description

[0001] This application claims priority to and the benefit of Korean Patent Application No. 10-2019-0014111 filed on February 1, 2019, in the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to a display device. Background Art

[0003] With the development of multimedia technology, display devices are becoming more and more important. Therefore, various display devices such as liquid crystal display devices (LCD) and / or organic light emitting diode display devices (or organic light emitting display devices, OLED) are currently being developed.

[0004] Among display devices, an organic light-emitting display device includes an organic light-emitting element as a self-luminous element. The organic light-emitting element may include two opposing electrodes and an organic emission layer disposed therebetween. Electrons and holes supplied from the two electrodes are recombined in the emission layer to generate excitons, and the generated excitons fall from an excited state to a ground state, thereby emitting light.

[0005] Such an organic light emitting display device does not require a separate light source, so such an organic light emitting display device consumes less power, and can be made (manufactured) to be lightweight and thin, and exhibits high quality characteristics such as a wide viewing angle, high brightness and contrast, and / or a fast response speed. Therefore, the organic light emitting display device has attracted much attention as a next-generation display device. Summary of the invention

[0006] One or more aspects of an embodiment of the present disclosure are directed to a display device that can improve brightness and color gamut by preventing or reducing color mixing between sub-pixels.

[0007] It should be noted that the embodiments of the present disclosure are not limited to the above-mentioned embodiments; and other embodiments of the present invention should be apparent to those skilled in the art through the following description.

[0008] According to exemplary embodiments of the present disclosure, brightness and color gamut may be improved by preventing or reducing color mixing between sub-pixels.

[0009] According to exemplary embodiments of the present disclosure, light extraction efficiency of a display device may be improved.

[0010] However, the embodiments of the present invention are not limited to the embodiments described herein. The above and other embodiments of the present invention should become more obvious to those skilled in the art by referring to the detailed description of the present invention given below.

[0011] According to an embodiment of the present disclosure, a display device includes: a first substrate including at least one light emitting element; a second substrate facing the first substrate, wherein light emitted from the at least one light emitting element will be incident on the second substrate; and a filling layer located between the first substrate and the second substrate, wherein the filling layer includes a filling pattern, the filling pattern includes a first pattern portion located on the first substrate, and the first pattern portion has a curved portion formed in at least a portion thereof.

[0012] In an exemplary embodiment, at least a portion of the filling pattern overlaps the at least one light emitting element, and light emitted from the at least one light emitting element is to be incident on the filling pattern.

[0013] In exemplary embodiments, at least a portion of light incident on the filling pattern will be scattered at the bent portion of the first pattern part.

[0014] In exemplary embodiments, at least a portion of the light scattered at the bent portion will be incident on the second substrate.

[0015] In an exemplary embodiment, the bent portion has at least one convex portion and at least one concave portion, wherein the at least one convex portion protrudes upward from a straight line extending from one end of the bent portion toward its opposite end, and the at least one concave portion protrudes downward from the straight line, and wherein the convex portion is separated from the adjacent convex portion by 0.5 μm to 1.5 μm.

[0016] In an exemplary embodiment, the filling pattern further includes a second pattern portion on the first pattern portion, and the second pattern portion includes a material substantially the same as that of the first pattern portion.

[0017] In an exemplary embodiment, the first pattern section and the second pattern section include hexamethyldisiloxane (HMDSO).

[0018] In an exemplary embodiment, the bent portion of the first pattern part is formed when hexamethyldisiloxane reacts with nitrogen-containing molecules, and the bent portion includes nitrogen.

[0019] In an exemplary embodiment, a nitrogen content in the first pattern portion is greater than a nitrogen content in the second pattern portion.

[0020] In an exemplary embodiment, a bottom surface of a first pattern portion of the filling pattern contacts at least a portion of the first substrate, and a top surface of a second pattern portion of the filling pattern contacts at least a portion of the second substrate.

[0021] In an exemplary embodiment, the second pattern portion covers at least a portion of the bent portion, and light emitted from the at least one light emitting element will be scattered at the bent portion and will be incident on the second pattern portion.

[0022] In an exemplary embodiment, the filling pattern includes cells, and the cells of the filling pattern are spaced apart from each other, and wherein the filling layer further includes a filling material between the cells of the filling pattern.

[0023] In an exemplary embodiment, a bottom surface of the filling pattern contacts the first substrate, and a top surface of the filling pattern contacts the second substrate, and wherein the filling material is disposed between cells of the filling pattern.

[0024] In an exemplary embodiment, at least a portion of light incident on the filling pattern will be incident on an interface between a side surface of the filling pattern and the filling material, and wherein at least a portion of the light incident on the interface will be reflected toward the filling pattern.

[0025] In an exemplary embodiment, a bottom surface of the filling pattern contacts the first substrate, and a top surface of the filling pattern is spaced apart from the second substrate, and wherein the filling material is between the filling pattern and the second substrate and between cells of the filling pattern.

[0026] In an exemplary embodiment, the filling pattern includes a material having a higher refractive index than a refractive index of the filling material, and wherein a difference between the refractive index of the filling pattern and the refractive index of the filling material is greater than 0.3.

[0027] In an exemplary embodiment, a difference between a refractive index of the filling pattern and a refractive index of each of the first substrate and the second substrate is in a range of 0.01 to 0.3.

[0028] According to another embodiment of the present disclosure, a display device includes: a first substrate; at least one organic light-emitting element located in each of a plurality of emission areas defined in the first substrate; a second substrate facing the first substrate, a plurality of light emission areas being defined in the second substrate; and a filling layer located between the at least one organic light-emitting element and the second substrate, the filling layer including a filling pattern and a filling material, and when viewed from the top, the filling pattern is composed of monomers alternately arranged in one direction, wherein the filling pattern includes: a first pattern portion at least partially overlapping the plurality of light emission areas and having a curved portion in at least a portion thereof; and a second pattern portion located on the first pattern portion and covering the curved portion, and wherein a refractive index of the filling material is less than a refractive index of the filling pattern.

[0029] In an exemplary embodiment, light emitted from the at least one organic light emitting element will be incident on the first pattern portion of the filling pattern, and the light incident on the first pattern portion will be scattered at the bent portion.

[0030] In exemplary embodiments, at least a portion of light incident on the first pattern portion will be incident on an interface between a side surface of the filling pattern and the filling material, and wherein at least a portion of the light incident on the interface will be reflected toward the first pattern portion.

[0031] In an exemplary embodiment, at least a portion of the light scattered at the bent portion will be incident on the second pattern part.

[0032] In exemplary embodiments, at least a portion of light incident on the second pattern portion will be incident on an interface between a side surface of the filling pattern and the filling material, and wherein at least a portion of the light incident on the interface will be reflected toward the first pattern portion or the second pattern portion.

[0033] In an exemplary embodiment, the display device further includes an encapsulation layer between the at least one organic light emitting element and the filling layer, wherein the filling pattern is located on the encapsulation layer so that a bottom surface of the first pattern portion contacts the encapsulation layer and a top surface of the second pattern portion faces the second substrate.

[0034] In an exemplary embodiment, the encapsulation layer includes the same material as that of the first and second pattern parts of the filling pattern.

[0035] In an exemplary embodiment, a length of a bottom surface of the filling pattern measured in a direction parallel to the first base is substantially equal to a length of a top surface of the filling pattern measured in the direction.

[0036] In an exemplary embodiment, when viewed from the top, an area of ​​a bottom surface of the filling pattern is greater than an area of ​​a top surface thereof, and wherein a side surface of the filling pattern is inclined such that the side surface forms an acute angle with the encapsulation layer.

[0037] In an exemplary embodiment, when viewed from the top, an area of ​​a bottom surface of the filling pattern is smaller than an area of ​​a top surface thereof, and wherein a side surface of the filling pattern is inclined such that the side surface forms an obtuse angle with the encapsulation layer.

[0038] In an exemplary embodiment, the filling pattern includes: a first unit of the filling pattern; and a second unit of the filling pattern spaced apart from the first unit in a first direction parallel to the first substrate, and wherein the filling material is located between the first unit and the second unit of the filling pattern.

[0039] In an exemplary embodiment, the at least one organic light-emitting element includes: a first organic light-emitting element; and a second organic light-emitting element separated from the first organic light-emitting element, and wherein the plurality of emission regions include a first emission region overlapping the first organic light-emitting element and a second emission region overlapping the second organic light-emitting element.

[0040] In an exemplary embodiment, the display device also includes: a first wavelength conversion pattern located between the second substrate and the first organic light-emitting element; and a second wavelength conversion pattern located between the second substrate and the second organic light-emitting element, and wherein the plurality of light emission areas include: a first light emission area overlapping the first wavelength conversion pattern; and a second light emission area overlapping the second wavelength conversion pattern.

[0041] In an exemplary embodiment, light emitted from the first emission region will be incident on the first monomer of the filling pattern, and at least a portion of the incident light will be scattered at the bent portion to be incident on the first wavelength conversion pattern.

[0042] In an exemplary embodiment, at least a portion of the light incident on the first monomer of the filling pattern will be incident on an interface between a side surface of the first monomer of the filling pattern and the filling material, and wherein at least a portion of the light incident on the interface will be reflected toward the first monomer of the filling pattern to be incident on the first wavelength conversion pattern.

[0043] In an exemplary embodiment, an area of ​​a bottom surface of the first monomer filling the pattern is greater than an area of ​​the first emission region, and an area of ​​a top surface of the first monomer filling the pattern is substantially equal to an area of ​​the first light exit region. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 is a perspective view of a display device according to an exemplary embodiment of the present disclosure.

[0045] Figure 2 is along Figure 1 A cross-sectional view of the display device taken along line II-II'.

[0046] Figure 3 yes Figure 1 and Figure 2 A plan view of a display device is shown in FIG.

[0047] Figure 4 According to an exemplary embodiment of the present disclosure Figure 3 A cross-sectional view of the display device taken along line IV-IV'.

[0048] Figure 5 yes Figure 4 An enlarged cross-sectional view of portion Q1.

[0049] Figure 6 It is shown Figure 5 A modified cross-sectional view of the structure shown in FIG.

[0050] Figure 7 It is shown Figure 5 A cross-sectional view of another modification of the structure shown in FIG.

[0051] Figure 8 is an enlarged view for illustrating a light path in a display device according to a comparative example.

[0052] Fig. 9 and Fig.10 It is used to show Figure 4 A magnified view of the light path in area A.

[0053] Fig.11 According to another exemplary embodiment of the present disclosure Figure 3 A cross-sectional view of the display device taken along line IV-IV'.

[0054] Fig.12 According to another exemplary embodiment of the present disclosure Figure 1 A cross-sectional view of the display device taken along line II-II'.

[0055] Fig.13 It is used to show Fig.11 A magnified view of the light path in area A.

[0056] Fig.14 According to another exemplary embodiment of the present disclosure Figure 3 A cross-sectional view of the display device taken along line IV-IV'.

[0057] Figures 15 to 18 is used to show the manufacturing Fig.14 A cross-sectional view of some process steps (actions) of a method for displaying a device.

[0058] Figures 19 to 22 According to other exemplary embodiments of the present disclosure Figure 3 A cross-sectional view of the display device taken along line IV-IV'.

[0059] Figure 23 to Figure 25 are schematic plan views of a first substrate and a filling pattern formed on the first substrate according to various exemplary embodiments.

[0060] Fig.26 and Fig. 27 According to other exemplary embodiments of the present disclosure Figure 3 A cross-sectional view of the display device taken along line IV-IV'. DETAILED DESCRIPTION

[0061] Hereinafter, the present invention will now be more fully described with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. However, the present invention may be implemented in different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the scope of the invention to those skilled in the art.

[0062] It will also be understood that when a layer is referred to as being "on" another layer or substrate, the layer may be directly on the other layer or substrate, or intervening layers may also be present. When a layer is referred to as being "directly on" another layer or substrate, there may not be intervening layers. Throughout the specification and drawings, the same reference numerals refer to the same components.

[0063] When expressions such as "at least one of", "one of", and "selected from" follow a list of elements, they modify the entire list of elements rather than the individual elements of the list. In addition, when describing embodiments of the present invention, the use of "may" refers to "one or more embodiments of the present invention."

[0064] The term "exemplary embodiment" may refer to an example embodiment.

[0065] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0066] Figure 1 is a perspective view of a display device according to an exemplary embodiment of the present disclosure. Figure 2 is along Figure 1 A cross-sectional view of the display device taken along line II-II'. Figure 3 yes Figure 1 and Figure 2 A plan view of a display device is shown in FIG.

[0067] Figures 1 to 3 The display device 10 shown in the figure can be used for various electronic devices, including small and medium-sized electronic devices such as tablet PCs, smart phones, vehicle navigation units, cameras, central information displays (CIDs) installed in vehicles, wristwatch-type electronic devices, personal digital assistants (PDAs), portable multimedia players (PMPs) and / or game consoles, and / or large and medium-sized electronic devices such as televisions, electronic billboards, monitors, personal computers and / or laptop computers. It should be understood that the electronic devices listed above are merely illustrative, and the display device 10 can be used for various other suitable electronic devices without departing from the scope of the present disclosure.

[0068] In some exemplary embodiments, the display device 10 may have a rectangular shape when viewed from the top. The display device 10 may have two short sides extending in one direction and two long sides extending in another direction intersecting the one direction. Although the corner where the long side and the short side of the display device 10 meet may form a right angle, this is merely illustrative. The display device 10 may have rounded corners. When viewed from the top, the shape of the display device 10 is not limited to the shape shown in the drawings. The display device 10 may have a square shape, a circular shape, an oval shape, or other suitable shapes.

[0069] The display device 10 may include a display area DA where an image is displayed and a non-display area NDA where an image is not displayed.

[0070] The display area DA may be disposed in (e.g., located at) a central portion of the display device 10. The display area DA may include a plurality of pixels. The plurality of pixels may include a first pixel PX1 that emits light of a first color (e.g., red light having a peak wavelength in the range of about 610nm to 650nm), a second pixel PX2 that emits light of a second color (e.g., green light having a peak wavelength in the range of about 510nm to 550nm), and a third pixel PX3 that emits light of a third color (e.g., blue light having a peak wavelength in the range of about 430nm to 470nm). The first pixel PX1, the second pixel PX2, and the third pixel PX3 may be repeatedly (e.g., sequentially) arranged in a row direction and in a column direction. The pixels PX1, PX2, and PX3 may be arranged in various suitable shapes, such as stripes and / or pentiles.

[0071] Each of the pixels PX1, PX2, and PX3 may include emission regions LA1, LA2, and LA3 and a non-emission region LB. Each of the emission regions LA1, LA2, and LA3 is defined as a region that emits light through an organic layer, and the non-emission region LB is defined as a region that does not emit light through the organic layer. The non-emission region LB may be disposed to surround the emission regions LA1, LA2, and LA3. The emission regions LA1, LA2, and LA3 may be separated from the non-emission region LB by a dam layer to be described later.

[0072] The wavelength of light emitted from each of the pixels PX1, PX2, and PX3 can be adjusted not only by the light emitted from the emission areas LA1, LA2, and LA3, but also by a wavelength conversion pattern or a color filter overlapped with the emission areas LA1, LA2, and LA3. For example, the first emission area LA1 of each first pixel PX1, the second emission area LA2 of each second pixel PX2, and the third emission area LA3 of each third pixel PX3 can all emit light of the same wavelength (e.g., blue light), and the blue light can be converted into light of different colors for different pixels by a wavelength conversion pattern and / or a color filter provided in the pixel.

[0073] The non-display area NDA may be disposed outside the display area DA to surround the display area DA. The non-display area NDA may not include an emission area. However, it will be understood that the present disclosure is not limited thereto. In some embodiments, the non-display area NDA may have a structure substantially the same as that of the emission area, and may include a dummy emission area controlled not to emit light, or may include an emission area and a light blocking member for blocking light from being emitted.

[0074] like Figure 2 As shown in , the display device 10 may include a first substrate 100, a second substrate 300 facing the first substrate 100, and a filling layer 500 disposed between the first substrate 100 and the second substrate 300. As will be described later, the filling layer 500 may include a single body of a filling pattern 510 disposed between the first substrate 100 and the second substrate 300 and a sealing member 550 that combines the first substrate 100 and the second substrate 300 at their edges.

[0075] The first substrate 100 may include elements and circuits for displaying images, for example, a pixel circuit such as a switching element, a bank layer defining emission areas LA1, LA2, and LA3 and a non-emission area LB in a display area DA, and an organic light emitting element. For example, the first substrate 100 may be a display substrate.

[0076] The second substrate 300 is located above the first substrate 100 and faces the first substrate 100. For example, the second substrate 300 may be, but is not limited to, a color conversion substrate including a color conversion pattern for converting the color of incident light.

[0077] The sealing member 550 may be disposed between the first substrate 100 and the second substrate 300 in the non-display area NDA. When viewed from the top, the sealing member 550 may be disposed in the non-display area NDA along the edges of the first substrate 100 and the second substrate 300 to surround the display area DA. The first substrate 100 and the second substrate 300 may be coupled to each other by the sealing member 550. For example, the sealing member 550 may be made of, but not limited to, a material including an organic material such as an epoxy resin.

[0078] The filling pattern 510 may be disposed in a space between the first substrate 100 and the second substrate 300 surrounded by the sealing member 550 of the filling layer 500. The filling pattern 510 may be disposed on the first substrate 100 such that the filling layer 500 is at least partially filled with the filling pattern 510. The filling pattern 510 includes a material capable of transmitting light, and thus light output from the first substrate 100 may pass through the filling pattern 510.

[0079] The monomers of the filling pattern 510 are disposed on the first substrate 100 so that they are spaced apart from each other. The monomers of the filling pattern 510 may be spaced apart from each other in a first direction d1 or a second direction d2 intersecting the first direction d1, and may be arranged on the first substrate 100 in a substantially grid pattern. However, it will be understood that the present disclosure is not limited thereto. In some embodiments, the monomers of the filling pattern 510 may be spaced apart from each other in different directions forming a predetermined (or set) angle with the first direction d1 and the second direction d2.

[0080] As described above, the filling pattern 510 may be used to fill the space between the first substrate 100 and the second substrate 300. Figure 2 In the embodiment, a filling pattern 510 having a predetermined (or set) height is disposed between the first substrate 100 and the second substrate 300, so that the space between the first substrate 100 and the second substrate 300 and the space between the filling pattern 510 and the second substrate 300 are filled with a filling material 520. However, it will be understood that the present disclosure is not limited thereto. In one or more embodiments, the height of the filling pattern 510 is equal to the distance between the first substrate 100 and the second substrate 300, so that the bottom surface and the top surface of the filling pattern 510 can be in contact with the first substrate 100 and the second substrate 300, respectively. In one or more embodiments, the filling pattern 510 can be disposed on the entire surface of the first substrate 100, so that the filling layer 500 can be filled with the filling pattern 510. A more detailed description thereof will be given later with reference to other exemplary embodiments.

[0081] The filling pattern 510 and the filling material 520 may include materials having different refractive indexes. For example, the filling pattern 510 may include a material having a higher refractive index than the filling material 520. The filling pattern 510 may reduce the refractive index difference between the filling layer 500 and each of the first substrate 100 and the second substrate 300, for example, the difference between the refractive index of the filling pattern 510 and the refractive index of each of the first substrate 100 and the second substrate 300 is in the range of about 0.01 to about 0.3. Therefore, a portion of the light output from the first substrate 100 may pass through the filling pattern 510 to be incident on the second substrate 300.

[0082] According to an exemplary embodiment of the present disclosure, the filling pattern 510 may include a first pattern portion 510a having a bent portion GP (see FIG. 5A ) formed in at least a portion thereof. Figure 4 ). The bent portion GP formed in the first pattern portion 510a may scatter light incident from the first substrate 100. The light scattered by the bent portion GP may pass through the filling pattern 510 to reduce light reflected from the filling material 520 or the second substrate 300. As a result, more light output from the first substrate 100 may be incident on the second substrate 300, and thus the light extraction efficiency of the display device 10 may be increased. A more detailed description thereof will be given later.

[0083] The filling pattern 510 may include a silicon-based organic material, an epoxy-based organic material, and / or an epoxy-acrylic organic material. In an exemplary embodiment, the filling pattern 510 may include silicon (oxygen) rubber and / or hexamethyldisiloxane (HMDSO). The filling material 520 may be an air layer or a gas layer containing nitrogen and / or an inert gas (such as argon) or a mixture of various gases.

[0084] In an exemplary embodiment, when the filling pattern 510 includes a material having a high refractive index, such as hexamethyldisiloxane (HMDSO), the refractive index difference between the first substrate 100 and the second substrate 300 may be reduced. Therefore, light output from the first substrate 100 may be effectively incident on the second substrate 300 through the filling pattern 510. A more detailed description thereof will be given later.

[0085] In the following, reference will be made to Figures 4 to 7 The structure of the display device 10 is described in more detail.

[0086] Figure 4 According to an exemplary embodiment of the present disclosure Figure 3 A cross-sectional view of the display device taken along line IV-IV'. Figure 5 yes Figure 4 An enlarged cross-sectional view of portion Q1. Figure 6 It is shown Figure 5A modified cross-sectional view of the structure shown in FIG. Figure 7 It is shown Figure 5 A cross-sectional view of another modification of the structure shown in FIG.

[0087] First refer to Figure 4 , the display device 10 may include a first substrate 100, a second substrate 300, and a filling layer 500. The filling layer 500 may include a single body of a filling pattern 510 disposed on the first substrate 100.

[0088] The first substrate 100 may include a first base 110 , switching elements T1 , T2 , and T3 , an insulating layer 130 , a bank layer 150 , organic light emitting elements ED1 , ED2 , and ED3 , and an encapsulation layer 170 .

[0089] The first substrate 110 may be made of a light-transmitting material and may be a glass substrate and / or a plastic substrate.

[0090] At least one switching element T1, T2, and T3 may be disposed in each of the pixels PX1, PX2, and PX3 on the first substrate 110. A plurality of signal lines (e.g., gate lines, data lines, power lines, etc.) for transmitting signals to the switching elements T1, T2, and T3 may be further disposed on the first substrate 110.

[0091] The insulating layer 130 may be disposed on the switching elements T1, T2, and T3. The insulating layer 130 may be formed of an organic layer. For example, the insulating layer 130 may include acrylic resin, epoxy resin, imide resin, ester resin, etc.

[0092] Pixel electrodes AE1, AE2, and AE3 may be disposed on the insulating layer 130 in the pixels PX1, PX2, and PX3, respectively. The pixel electrodes AE1, AE2, and AE3 may be located in the emission areas LA1, LA2, and LA3, respectively, and at least a portion of the pixel electrodes AE1, AE2, and AE3 may extend to the non-emission area LB. The pixel electrodes AE1, AE2, and AE3 may be connected to the switching elements T1, T2, and T3, respectively, through through holes passing through the insulating layer 130.

[0093] In an exemplary embodiment, each of the pixel electrodes AE1, AE2, and AE3 may be an anode electrode of a corresponding organic light emitting element. The pixel electrodes AE1, AE2, and AE3 may include a material having a high work function that is easy to inject holes, such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), and / or indium oxide (In 2 O 3). When the display device 10 is a top-emitting display device, for example, the pixel electrodes AE1, AE2, and AE3 may further include a reflective metal layer. The reflective metal layer may include, for example, silver (Ag), magnesium (Mg), aluminum (Al), platinum (Pt), lead (Pb), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), lithium (Li), calcium (Ca), or a mixture thereof. In some exemplary embodiments, the pixel electrodes AE1, AE2, and AE3 may have a material selected from ITO / Ag, Ag / ITO, ITO / Mg, and ITO / MgF 2 The invention can be a two-layer structure selected from the group consisting of ITO, Ag, and ITO, or a multi-layer structure of ITO / Ag / ITO. However, it will be understood that the present disclosure is not limited thereto.

[0094] The bank layer 150 may be disposed on the pixel electrodes AE1, AE2, and AE3. The bank layer 150 is disposed along the boundaries of the pixels PX1, PX2, and PX3. The bank layer 150 may be formed in a grid pattern and may include openings that partially expose the pixel electrodes AE1, AE2, and AE3. As described above, the emission areas LA1, LA2, and LA3 may be separated from the non-emission area LB by the bank layer 150. The exposed portions of the pixel electrodes AE1, AE2, and AE3 that are not covered by the bank layer 150 may correspond to the emission areas LA1, LA2, and LA3, respectively, and the portions covered by the bank layer 150 may correspond to the non-emission area LB.

[0095] In some exemplary embodiments, the bank layer 150 may include an organic insulating material such as polyacrylate resin, epoxy resin, phenol resin, polyamide resin, polyimide resin, unsaturated polyester resin, polyphenylene ether resin, polyphenylene sulfide resin and / or benzocyclobutene (BCB). However, it will be understood that the present disclosure is not limited thereto.

[0096] The organic layers OL1, OL2, and OL3 may be disposed on portions of the pixel electrodes AE1, AE2, and AE3 exposed through the openings of the bank layer 150, respectively. Figures 5 to 7 The organic layers OL1 , OL2 , and OL3 are described in more detail.

[0097] although Figures 5 to 7 Only the stack structure of the first organic layer OL1 among the organic layers OL1 , OL2 , and OL3 is shown, but the other organic layers OL2 and OL3 may have the same stack structure.

[0098] Reference Figure 5According to an exemplary embodiment of the present disclosure, the first organic layer OL1 may include a first hole transport layer HTL1 disposed on the first pixel electrode AE1, a first emission layer EL11 disposed on the first hole transport layer HTL1, and a first charge (electron) transport layer ETL1 disposed on the first emission layer EL11. According to an exemplary embodiment of the present disclosure, the first organic layer OL1 may include only a single emission layer as an emission layer, for example, the first emission layer EL11. The first emission layer EL11 may be a blue emission layer. It will be understood that the stacking structure of the first organic layer OL1 is not limited to Figure 5 structure, and can be Figure 6 or Figure 7 The modifications shown in .

[0099] Reference Figure 6 The first organic layer OL1a may further include a first charge generation layer CGL11 disposed on the first emission layer EL11 and a second emission layer EL12 disposed on the first charge generation layer CGL11. A first charge (electron) transport layer ETL1 may be disposed on the second emission layer EL12.

[0100] The first charge generation layer CGL11 may be used to inject charges into an adjacent emission layer. The first charge generation layer CGL11 may be used to adjust the charge balance between the first emission layer EL11 and the second emission layer EL12. In some exemplary embodiments, the first charge generation layer CGL11 may include an n-type charge generation layer and a p-type charge generation layer. The p-type charge generation layer may be disposed on the n-type charge generation layer.

[0101] The second emission layer EL12 may emit blue light like the first emission layer EL11. However, it will be understood that the present disclosure is not limited thereto. The second emission layer EL12 may emit blue light having the same peak wavelength as the peak wavelength of the first emission layer EL11, or blue light having a peak wavelength different from the peak wavelength of the first emission layer EL11. In another embodiment, the first emission layer EL11 and the second emission layer EL12 may emit light of different colors. That is, the first emission layer EL11 may emit blue light, and the second emission layer EL12 may emit green light.

[0102] The first organic layer OL1a having the above structure includes two emission layers so that Figure 5 Compared with the structure of , the light extraction efficiency and life span can be improved.

[0103] Figure 7 FIG. 4 shows that the first organic layer OL1b may include three emission layers EL11, EL12, and EL13 and two charge generation layers CGL11 and CGL12 disposed between the three emission layers EL11, EL12, and EL13. Figure 7As shown in , the first organic layer OL1b may further include a first charge generation layer CGL11 disposed on the first emission layer EL11, a second emission layer EL12 disposed on the first charge generation layer CGL11, a second charge generation layer CGL12 disposed on the second emission layer EL12, and a third emission layer EL13 disposed on the second charge generation layer CGL12. The first charge (electron) transport layer ETL1 may be disposed on the third emission layer EL13.

[0104] The third emission layer EL13 may emit blue light like the first emission layer EL11 and the second emission layer EL12. In an exemplary embodiment, each of the first emission layer EL11, the second emission layer EL12, and the third emission layer EL13 may emit blue light of the same peak wavelength or different peak wavelengths. In another exemplary embodiment, the first emission layer EL11, the second emission layer EL12, and the third emission layer EL13 may emit light of different colors. For example, each emission layer may emit blue light or green light, or the emission layer may emit red light, green light, and blue light, respectively, to emit white light as a whole.

[0105] Return to reference Figure 4 , the organic layers OL1, OL2, and OL3 may be individually disposed in corresponding pixels. For example, the organic layers OL1, OL2, and OL3 may be respectively disposed on the pixel electrodes AE1, AE2, and AE3 exposed through the openings of the bank layer 150 so that they may be separated from each other by the bank layer 150.

[0106] However, it will be understood that the present disclosure is not limited thereto. The organic layers OL1, OL2, and OL3 may be connected to each other across adjacent pixels. For example, the first organic layer OL1, the second organic layer OL2, and the third organic layer OL3 may be connected to each other outside the bank layer 150. It should be noted that since only portions of the organic layers that are in contact with the respective pixel electrodes AE1, AE2, and AE3 emit light, a connection with the bank layer 150 may be formed. Figure 4 In this case, the process of separating the organic layer from pixel to pixel can be omitted, and the process efficiency can be improved.

[0107] In one or more embodiments, some stacked films of the organic layers OL1, OL2, and OL3 may be separated from pixel to pixel, while other stacked films may be formed across pixels. For example, the emission layer of each organic layer may be separated from pixel to pixel, while the hole transport layer and / or the electron transport layer may be formed as a common layer. However, it will be understood that the present disclosure is not limited thereto.

[0108] Return to reference Figure 4, a common electrode CE is disposed on the organic layers OL1 , OL2 , and OL3 . The common electrode CE may be disposed over the entire surface of the pixels PX1 , PX2 , and PX3 .

[0109] When each of the pixel electrodes AE1, AE2 and AE3 is an anode electrode of a corresponding organic light emitting element, the common electrode CE is a cathode electrode of the organic light emitting element. The common electrode CE may include a material having a low work function to allow easy electron injection, for example, Li, Ca, LiF / Ca, LiF / Al, Al, Mg, Ag, Pt, Pd, Ni, Au, Nd, Ir, Cr, BaF 2 , Ba, etc. or their composites or mixtures (for example, a mixture of Ag and Mg).

[0110] When the display device 10 is a top emission display device, the common electrode CE may be transparent or transflective. The common electrode CE may be formed of a material having a low work function to have a high reflectivity within tens of To several hundred The common electrode CE may have a thickness within a range of , so that the common electrode CE may be transparent or transflective. When the common electrode CE includes a thin metal film having a low work function, the common electrode CE may further include a transparent conductive material layer (such as tungsten oxide (WO x ), titanium oxide (TiO 2 ), indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium tin zinc oxide (ITZO) and / or magnesium oxide (MgO)) to reduce resistance and achieve transmittance.

[0111] The first pixel electrode AE1, the first organic layer OL1 and the common electrode CE may form a first organic light emitting element ED1. The second pixel electrode AE2, the second organic layer OL2 and the common electrode CE may form a second organic light emitting element ED2. The third pixel electrode AE3, the third organic layer OL3 and the common electrode CE may form a third organic light emitting element ED3.

[0112] The encapsulation layer 170 may be disposed on the common electrode CE. In order to prevent or reduce the penetration of impurities or moisture from the outside, the encapsulation layer 170 may be disposed over the organic light emitting elements ED1, ED2, and ED3 to seal the first substrate 100.

[0113] The encapsulation layer 170 may be disposed over the entire (full) surface of the pixels PX1, PX2, and PX3. In an exemplary embodiment, the encapsulation layer 170 may directly cover the common electrode CE. In another exemplary embodiment, a cover layer may be further disposed between the encapsulation layer 170 and the common electrode CE to cover the common electrode CE, in which case the encapsulation layer 170 may directly cover the cover layer.

[0114] It will be understood that the structure of the encapsulation layer 170 is not limited thereto. As an example, the encapsulation layer 170 may have a greater number of stacked structures. A more detailed description thereof will be given below.

[0115] The second substrate 300 may include a second base 310 , a light blocking member 320 , color filters 331 , 333 , and 335 , wavelength conversion patterns 341 and 343 , a light-transmitting pattern 345 , a planarization layer OC, and capping layers PS1 , PS2 , and PS3 .

[0116] The light emission areas PA1, PA2 and PA3 and the non-light emission area PB may be defined in the second substrate 300. The light emission areas PA1, PA2 and PA3 are defined as areas where light is emitted to the outside, and the non-light emission area PB is defined as an area where light is blocked and not emitted to the outside. The non-light emission area PB may be disposed to surround the light emission areas PA1, PA2 and PA3. The light emission areas PA1, PA2 and PA3 may include the above-mentioned emission areas LA1, LA2 and LA3, respectively, and may include at least a portion of the non-emission area LB. The non-light emission area PB may be disposed in the non-emission area LB. That is, the area of ​​the light emission areas PA1, PA2 and PA3 may be greater than the area of ​​the emission areas LA1, LA2 and LA3, and the area of ​​the non-light emission area PB may be smaller than the area of ​​the non-emission area LB.

[0117] The second substrate 310 may be made of a light-transmitting material and may be a glass substrate and / or a plastic substrate.

[0118] The light blocking member 320 may be disposed on the second substrate 310. The light blocking member 320 may be disposed along the boundaries of the pixels PX1, PX2, and PX3, and may block or reduce the transmission of light. For example, when viewed from the top, the light blocking member 320 may be formed in a grid pattern, and may prevent or reduce color mixing that occurs when light crosses adjacent light emission areas PA1, PA2, and PA3. The light emission areas PA1, PA2, and PA3 may be separated from the non-light emission areas PB by the light blocking member 320. For example, the portion of the second substrate 310 that is not overlapped with the light blocking member 320 becomes the light emission areas PA1, PA2, and PA3, and the portion of the second substrate 310 that is overlapped with the light blocking member 320 becomes the non-light emission area PB.

[0119] The light blocking member 320 may be formed of an organic material or a metal material including chromium. In one or more exemplary embodiments, the light blocking member 320 may be, but is not limited to, carbon black or an organic black matrix.

[0120] Color filters 331, 333, and 335 may be disposed on the second substrate 310 and the light blocking member 320. The first color filter 331 may overlap the first light emitting area PA1, the second color filter 333 may overlap the second light emitting area PA2, and the third color filter 335 may overlap the third light emitting area PA3.

[0121] The color filters 331, 333, and 335 can selectively transmit light of a specific color and absorb light of other colors to block the transmission of light of other colors. For example, the first color filter 331 can transmit light of the first color and absorb light of the second color and light of the third color to block them. As described above, the light of the first color can be red light, the light of the second color can be green light, and the light of the third color can be blue light. For example, the first color filter 331 can be a red color filter that transmits red light and blocks and absorbs green light and blue light, and can include a red colorant.

[0122] For example, the second color filter 333 may transmit the second color light and absorb the first color light and the third color light to block them. For example, the second color filter 333 may be a green color filter that transmits green light and blocks and absorbs red light and blue light, and may include a green colorant.

[0123] The third color filter 335 may transmit light of a third color and absorb light of the first color and light of the second color to block them. For example, the third color filter 335 may be a blue color filter that transmits blue light and blocks and absorbs red light and green light, and may include a blue colorant.

[0124] In some exemplary embodiments, a boundary among the color filters 331 , 333 , and 335 may be located in the non-light emitting region PB. The light blocking member 320 may be disposed between the boundary among the color filters 331 , 333 , and 335 and the second base 310 .

[0125] The first cap layer PS1 may be disposed on the color filters 331, 333, and 335. The first cap layer PS1 may prevent or reduce impurities such as moisture and air from penetrating from the outside to damage and / or contaminate the color filters 331, 333, and 335. In addition, the first cap layer PS1 may prevent or reduce the colorant included in each of the color filters 331, 333, and 335 from diffusing into other elements. In one or more exemplary embodiments, the first cap layer PS1 may be made of an inorganic material. For example, the first cap layer PS1 may be made of a material including silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, silicon oxynitride, and the like.

[0126] The wavelength conversion patterns 341 and 343 and the light-transmitting pattern 345 may be disposed on the first cover layer PS1 .

[0127] The first wavelength conversion pattern 341 may be disposed in the first light exiting area PA1, and not disposed in the second light exiting area PA2 and the third light exiting area PA3. The first wavelength conversion pattern 341 may convert the peak wavelength of the incident light into another peak wavelength, thereby emitting the light. For example, the first wavelength conversion pattern 341 may convert blue light into red light in the range of about 610 nm to about 650 nm.

[0128] The first wavelength conversion pattern 341 may include a first base resin 3411 and a first wavelength conversion material 3413 dispersed in the first base resin 3411 , and may further include a first scatterer 3415 dispersed in the first base resin 3411 .

[0129] The material of the first matrix resin 3411 is not particularly limited as long as it has high light transmittance and the first wavelength conversion material 3413 and the first scatterer 3415 can be well dispersed therein. For example, the first matrix resin 3411 may include an organic material such as epoxy resin, acrylic resin, cardo resin and / or imide resin.

[0130] The first wavelength conversion material 3413 can convert the peak wavelength of the incident light into another peak wavelength. Non-limiting examples of the first wavelength conversion material 3413 may include quantum dots, quantum rods, and / or phosphors. Quantum dots may be particulate matter that emits a certain color of light when electrons transition from a conduction band to a valence band.

[0131] Quantum dots can be semiconductor nanocrystal materials. Quantum dots have specific band gaps according to their composition and size, and can absorb light and emit light with intrinsic wavelengths. Non-limiting examples of semiconductor nanocrystals of quantum dots can include IV group nanocrystals, II-VI group compound nanocrystals, III-V group compound nanocrystals, IV-VI group compound nanocrystals, and combinations thereof.

[0132] Examples of Group IV nanocrystals may include, but are not limited to, silicon (Si), germanium (Ge); and binary compounds such as silicon carbide (SiC) and / or silicon germanium (SiGe).

[0133] In addition, examples of II-VI compound nanocrystals may include, but are not limited to, binary compounds such as CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, and / or MgS; binary compounds such as CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdS Ternary compounds such as CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe and / or MgZnS; and quaternary compounds such as HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe and / or HgZnSTe.

[0134] Examples of III-V compound nanocrystals may include, but are not limited to, binary compounds such as GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs and / or InSb; ternary compounds such as GaNPs, GaNAs, GaNSb, GaPAs, GaPSb, AlNPs, AlNAs, AlNSb, AlPAs, AlPSb, InNPs, InNAs, InNSb, InPAs and / or InPSb; and quaternary compounds such as GaAlNPs, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs and / or InAlPSb.

[0135] Examples of IV-VI compound nanocrystals may include binary compounds such as SnS, SnSe, SnTe, PbS, PbSe and / or PbTe; ternary compounds such as SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe and / or SnPbTe; and quaternary compounds such as SnPbSSe, SnPbSeTe and / or SnPbSTe.

[0136] The quantum dot may have a core-shell structure including a core containing nanocrystals and a shell surrounding the core. The shell of the quantum dot may be used as a protective layer for maintaining semiconductor properties by preventing or reducing chemical denaturation of the core, and / or as a charging layer for imparting electrophoretic properties to the quantum dot. The shell may be a single layer or multiple layers. Non-limiting examples of the shell of the quantum dot may include metal or non-metal oxides, semiconductor compounds, combinations thereof, and the like.

[0137] Examples of metal or non-metal oxides include, but are not limited to, SiO 2 、Al 2 O 3 、TiO 2 、ZnO、MnO、Mn 2 O 3 , Mn 3 O 4 , CuO, FeO, Fe 2 O 3 , Fe 3 O 4 , CoO, Co 3 O 4 and / or binary compounds of NiO and such as MgAl 2 O 4 、CoFe 2 O 4 、NiFe 2 O 4 and / or CoMn 2 O 4 of ternary compounds.

[0138] Examples of semiconductor compounds may include, but are not limited to, CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, GaAs, GaP, GaSb, HgS, HgSe, HgTe, InAs, InP, InSb, AlAs, AlP, AlSb, etc.

[0139] The light emitted from the first wavelength conversion material 3413 may have a full width at half maximum (FWHM) of an emission wavelength spectrum of about 45 nm or less, or about 40 nm or less, or about 30 nm or less. In this way, the color purity and color gamut of the color displayed by the display device may be improved. In addition, the light output from the first wavelength conversion material 3413 may travel in different directions regardless of the incident direction of the incident light. This may improve the lateral visibility of the display device.

[0140] A portion of the light L provided from the first organic light emitting element ED1 may not be converted into red light by the first wavelength conversion material 3413, but may pass through the first wavelength conversion pattern 341. The component that is not converted by the first wavelength conversion pattern 341 and is incident on the first color filter 331 may be blocked by the first color filter 331. On the other hand, the red light converted by the first wavelength conversion pattern 341 may pass through the first color filter 331 to be emitted to the outside. Therefore, the first emitted light L1 emitted to the outside from the first light emission area PA1 may be red light.

[0141] The first scatterer 3415 may have a refractive index different from that of the first matrix resin 3411, and may form an optical interface with the first matrix resin 3411. For example, the first scatterer 3415 may be light scattering particles. The materials of the first scatterer 3415 are not particularly limited as long as they can scatter at least a portion of the transmitted light. For example, the first scatterer 3415 may be metal oxide particles and / or organic particles. Non-limiting examples of metal oxides may include titanium oxide (TiO 2 )、ZrO 2 ), aluminum oxide (Al 2 O 3 ), indium oxide (In 2 O 3 )、ZnO、SnO 2 ) etc. Non-limiting examples of the material of the organic particles may include acrylic resin, urethane resin, etc. The first scatterer 3415 may scatter the light transmitted through the first wavelength conversion pattern 341 in any direction without substantially changing the wavelength of the light, regardless of the incident direction of the incident light. By doing so, the length of the path of the light passing through the first wavelength conversion pattern 341 may be increased, and the color conversion efficiency through the first wavelength conversion material 3413 may be increased.

[0142] In some exemplary embodiments, the thickness of the first wavelength conversion pattern 341 may be about 3 μm to about 15 μm. The content of the first wavelength conversion material 3413 included in the first wavelength conversion pattern 341 may be in the range of about 10% to about 60% by weight. The content of the first scatterer 3415 included in the first wavelength conversion pattern 341 may be in the range of about 2% to about 15% by weight.

[0143] The second wavelength conversion pattern 343 may be disposed in the second light exit area PA2, and not disposed in the first light exit area PA1 and the third light exit area PA3. The second wavelength conversion pattern 343 may convert the peak wavelength of the incident light into another peak wavelength so that the light is emitted. For example, the second wavelength conversion pattern 343 may convert blue light into green light in the range of about 510 nm to about 550 nm.

[0144] The second wavelength conversion pattern 343 may include a second base resin 3431 and a second wavelength conversion material 3433 dispersed in the second base resin 3431 , and may further include a second scatterer 3435 dispersed in the second base resin 3431 .

[0145] The material of the second matrix resin 3431 is not particularly limited as long as it has high light transmittance and the second wavelength conversion material 3433 and the second scatterer 3435 can be well dispersed therein. For example, the second matrix resin 3431 may include an organic material such as epoxy resin, acrylic resin, cardo resin and / or imide resin.

[0146] As described above, the second wavelength conversion material 3433 can convert the peak wavelength of the incident light into another peak wavelength. The second wavelength conversion material 3433 can convert blue light having a peak wavelength in the range of about 430nm to about 470nm into green light having a peak wavelength in the range of about 510nm to about 550nm.

[0147] Non-limiting examples of the second wavelength conversion material 3433 may include quantum dots, quantum rods, and phosphors. The second wavelength conversion material 3433 is substantially the same as the first wavelength conversion material 3413; therefore, a redundant description will not be provided.

[0148] The first wavelength conversion material 3413 and the second wavelength conversion material 3433 may both be quantum dots. In this case, the diameter of the quantum dots forming the first wavelength conversion material 3413 may be larger than the diameter of the quantum dots forming the second wavelength conversion material 3433. For example, the quantum dot size of the first wavelength conversion material 3413 may be approximately to about In addition, the quantum dot size of the second wavelength conversion material 3433 can be approximately to about

[0149] After the light passes through the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343, the polarization of the light may be eliminated, that is, the light is in a non-polarized state. Non-polarized light refers to light that is composed not only of polarization components in a specific direction but also of random polarization components that are not polarized in a specific direction. An example of non-polarized light may be natural light.

[0150] The second scatterer 3435 may have a refractive index different from that of the second matrix resin 3431 and may form an optical interface with the second matrix resin 3431. For example, the second scatterer 3435 may be light scattering particles. The second scatterer 3435 is substantially the same as the first scatterer 3415 described above; therefore, a redundant description will not be provided.

[0151] In one or more exemplary embodiments, the thickness of the second wavelength conversion pattern 343 may be about 3 μm to about 15 μm. The content of the second wavelength conversion material 3433 included in the second wavelength conversion pattern 343 may be in the range of about 10% to about 60% by weight. The content of the second scatterer 3435 included in the second wavelength conversion pattern 343 may be in the range of about 2% to about 15% by weight.

[0152] The light L emitted from the second organic light emitting element ED2 may be provided to the second wavelength conversion material 3433. The second wavelength conversion material 3433 may convert the light provided from the second organic light emitting element ED2 into green light having a peak wavelength in the range of about 510 nm to about 550 nm.

[0153] A portion of the light L provided from the second organic light emitting element ED2 may not be converted into green light by the second wavelength conversion material 3433, but may pass through the second wavelength conversion pattern 343, and may be blocked by the second color filter 333. On the other hand, a portion of the light L converted into green light by the second wavelength conversion pattern 343 passes through the second color filter 333 and is emitted to the outside. Therefore, the second emitted light L2 emitted to the outside from the second light emission area PA2 may be green light.

[0154] The light-transmitting pattern 345 may be disposed in the third light-exiting area PA3, and not disposed in the first and second light-exiting areas PA1 and PA2. The light-transmitting pattern 345 may transmit incident light.

[0155] The light-transmitting pattern 345 may further include a third base resin 3451 and a third scatterer 3455 dispersed in the third base resin 3451 .

[0156] The third base resin 3451 may be made of an organic material having high transmittance, and may be made of the same material as that of the first base resin 3411 , or may include at least one of the materials listed above as examples of the constituent material of the first base resin 3411 .

[0157] The third scatterer 3455 may have a refractive index different from that of the third matrix resin 3451, and may form an optical interface with the third matrix resin 3451. For example, the third scatterer 3455 may be light scattering particles. The materials of the third scatterer 3455 are not particularly limited as long as they can scatter at least a portion of the transmitted light. For example, the third scatterer 3455 may be metal oxide particles and / or organic particles. Non-limiting examples of metal oxides may include titanium oxide (TiO 2 ), zirconium oxide (ZrO 2 ), aluminum oxide (Al 2 O 3 ), indium oxide (In 2 O 3 )、ZnO、SnO 2 ) etc. Non-limiting examples of the material of the organic particles may include acrylic resin, urethane resin, etc. The third scatterer 3455 may scatter the light in any direction without substantially changing the wavelength of the light transmitted through the light-transmitting pattern 345, regardless of the incident direction of the incident light. In this way, the lateral visibility of the light passing through the light-transmitting pattern 345 may be improved.

[0158] Light L provided from the third organic light emitting element ED3 passes through the light-transmitting pattern 345 and the third color filter 335 and is emitted to the outside. That is, the third emitted light L3 escaping from the third light emission area PA3 may have the same wavelength as the light L emitted from the third organic light emitting element ED3 as blue light.

[0159] In one or more exemplary embodiments, a low refractive layer may be further disposed between the first cover layer PS1 and each of the first wavelength conversion pattern 341, the second wavelength conversion pattern 343, and the light-transmitting pattern 345. The low refractive layer may be disposed throughout the first light emitting area PA1, the second light emitting area PA2, the third light emitting area PA3, and the non-light emitting area PB. The low refractive layer may have a refractive index lower than that of the first wavelength conversion pattern 341, the second wavelength conversion pattern 343, and the light-transmitting pattern 345. For example, the refractive index difference between the low refractive layer and each of the first wavelength conversion pattern 341, the second wavelength conversion pattern 343, and the light-transmitting pattern 345 may be equal to or greater than 0.3. The low refractive layer may include a matrix resin and particles dispersed in the matrix resin. The particles included in the low refractive layer may be selected from zinc oxide (ZnO) particles, titanium dioxide (TiO 2 ) particles, hollow silica particles, non-hollow silica particles, nano-silicate particles and porogen particles.

[0160] The low refractive layer may reflect some of the light traveling from the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343 toward the second base 310 back to the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343. That is, the low refractive layer recycles at least a portion of the light traveling toward the second base 310, thereby improving light utilization efficiency and improving light extraction efficiency of the display device.

[0161] The second cover layer PS2 may be disposed on the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343. The second cover layer PS2 may cover the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343, and in some exemplary embodiments, the second cover layer PS2 may be disposed on the light-transmitting pattern 345 to cover the light-transmitting pattern 345. The second cover layer PS2 may seal the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343 together with the first cover layer PS1, thereby being able to prevent or reduce impurities such as moisture and air from penetrating from the outside to damage and / or contaminate the first wavelength conversion pattern 341 and the second wavelength conversion pattern 343. In one or more exemplary embodiments, the second cover layer PS2 may be made of an inorganic material. The second cover layer PS2 may be made of the same material as that of the first cover layer PS1, or may include at least one of the materials listed above as the material of the first cover layer PS1.

[0162] In one or more exemplary embodiments, a filter layer may be further disposed on the wavelength conversion patterns 341 and 343 and the light-transmitting pattern 345. The filter layer may be a reflective filter that transmits light having a specific wavelength range and reflects light having other wavelength ranges. For example, the filter layer may transmit light of a third color and may reflect light of a first color and light of a second color.

[0163] The filter layer recycles the first color light and the second color light traveling from the wavelength conversion patterns 341 and 343 toward the first substrate 100 back to the second base 310, so that light extraction efficiency can be improved. In addition, the filter layer transmits the third color light provided from the organic light emitting elements ED1, ED2, and ED3, while reflecting the light having a center wavelength longer than the center wavelength of the third color light, so that the color purity of the third color light provided from the organic light emitting elements ED1, ED2, and ED3 can be improved.

[0164] A planarization layer OC may be further disposed on the second cover layer PS2. When the thickness of the first wavelength conversion pattern 341, the thickness of the second wavelength conversion pattern 343, and the thickness of the light-transmitting pattern 345 are different from each other and / or when the elements are separated from each other during the process, the planarization layer OC may provide a substantially flat surface over the elements at different heights. In one or more embodiments, the planarization layer OC may not be included.

[0165] The material of the planarization layer OC is not particularly limited as long as it can provide a flat surface. In one or more exemplary embodiments, the planarization layer OC may include an organic material. For example, the organic material may include a cardo-based resin, a polyimide-based resin, an acrylic resin, a siloxane-based resin, and / or a silsesquioxane-based resin.

[0166] The third cover layer PS3 may be further disposed on the planarization layer OC. The third cover layer PS3 may completely cover the planarization layer OC. When the planarization layer OC is not included as described above, the third cover layer PS3 may also not be included. The third cover layer PS3 may be made of an inorganic material. The third cover layer PS3 may be made of the same material as the first cover layer PS1, or may include at least one of the materials listed above as the material of the first cover layer PS1.

[0167] The filling layer 500 may be disposed between the second substrate 300 and the first substrate 100. As described above, the filling layer 500 may include a monomer of the filling pattern 510 disposed on the first substrate 100 and the filling material 520 and a sealing member 550 that combines the first substrate 100 with the second substrate 300. It should be noted that, for ease of description, in some drawings, the sealing member 550 located in the non-display area NDA of the display device 10 is not shown. Hereinafter, the filling pattern 510 and the filling material 520 will be described in more detail.

[0168] The filling pattern 510 may be disposed on the encapsulation layer 170 of the first substrate 100. Monomers of the filling pattern 510 may be spaced apart from each other and may be disposed to cover at least a portion of the encapsulation layer 170. The filling pattern 510 may provide a path for light L in which light output from the first substrate 100 is incident on the second substrate 300. The light L output from the first substrate 100 may pass through the filling layer 500 and may be incident on the second substrate 300. Then, the light L is emitted outside the display device 10 through the light emission areas PA1, PA2, and PA3. The filling pattern 510 disposed on the first substrate 100 may reduce the refractive index difference between the first substrate 100 and the second substrate 300, so that the light L can be prevented or reduced from being reflected by the interface between the filling layer 500 and the first substrate 100.

[0169] In one or more embodiments, the filling pattern 510 may be disposed on the encapsulation layer 170 such that at least a portion thereof overlaps the organic light emitting elements ED1, ED2, and ED3 of the first substrate 100. Light L emitted from the emission areas LA1, LA2, and LA3 of each of the organic light emitting elements ED1, ED2, and ED3 may be incident on the bottom surface BW of the filling pattern 510. Since the filling pattern 510 overlaps the organic light emitting elements ED1, ED2, and ED3, the light L emitted from the emission areas LA1, LA2, and LA3 may be incident on the bottom surface BW.

[0170] In one or more exemplary embodiments, at least a portion of the filling pattern 510 is arranged to overlap with the emission areas LA1, LA2, and LA3 of the organic light emitting elements ED1, ED2, and ED3, and the area of ​​the bottom surface BW of the filling pattern 510 may be equal to or greater than the area of ​​the emission areas LA1, LA2, and LA3. For example, since the filling pattern 510 is disposed so that it substantially overlaps with the emission areas LA1, LA2, and LA3, most of the light L emitted from the emission areas LA1, LA2, and LA3 may be incident on the filling pattern 510. However, it will be understood that the present disclosure is not limited thereto.

[0171] The bottom surface BW of the filling pattern 510 may be set to cover the level difference of the encapsulation layer 170, and at least a portion of the bottom surface BW may protrude. As will be described later, the filling pattern 510 may include an organic substance, may cover the level difference formed on the encapsulation layer 170, and may have a predetermined (or set) height H. In addition, even if the monomers of the filling pattern 510 are separated from each other, the level difference formed on the encapsulation layer 170 may be reduced. However, it will be understood that the present disclosure is not limited to this. In some embodiments, when the top surface of the encapsulation layer 170 is substantially flat, the bottom surface BW of the filling pattern 510 may also form a flat (or substantially flat) surface.

[0172] The filling pattern 510 may be disposed on the encapsulation layer 170 such that at least a portion thereof overlaps the wavelength conversion patterns 341 and 343 and / or the light-transmitting pattern 345 of the second substrate 300. Light L incident on the bottom surface BW of the filling pattern 510 may be emitted through the filling pattern 510 to be incident on the second substrate 300. The light L incident on the second substrate 300 may be incident on the wavelength conversion patterns 341 and 343 and / or the light-transmitting pattern 345 of the second substrate 300, and may be emitted from the light-exiting areas PA1, PA2, and PA3. At least a portion of the filling pattern 510 may overlap the wavelength conversion patterns 341 and 343 and / or the light-transmitting pattern 345 such that the light L passing through the filling pattern 510 may be effectively (or appropriately) incident on the wavelength conversion patterns 341 and 343 and / or the light-transmitting pattern 345 of the second substrate 300.

[0173] In one or more exemplary embodiments, at least a portion of the filling pattern 510 may overlap the light exit regions PA1, PA2, and PA3 without overlapping the non-light exit region PB, and in one or more exemplary embodiments, an area of ​​a top surface UW of the filling pattern 510 may be substantially equal to or greater than an area of ​​the light exit regions PA1, PA2, and PA3. According to one or more embodiments, since the filling pattern 510 is substantially disposed in the light exit regions PA1, PA2, and PA3, most of the light L passing through the filling pattern 510 may be incident on the wavelength conversion patterns 341 and 343 and the light-transmitting pattern 345. However, it will be understood that the present disclosure is not limited thereto.

[0174] Since the display device 10 includes a single body of the filling pattern 510 disposed on the first substrate 100 , it is possible to prevent or reduce color mixing of the light L emitted from the light emission areas PA1 , PA2 , and PA3 .

[0175] For example, the first monomer 511 of the filling pattern 510 may be arranged so that it overlaps with the first emission area LA1 of the first organic light emitting element ED1. The light L emitted from the first emission area LA1 may be incident on the bottom surface BW of the first monomer 511 of the filling pattern 510. The second monomer 512 of the filling pattern 510 may be arranged so that it overlaps with the second emission area LA2 of the second organic light emitting element ED2, and the light L emitted from the second emission area LA2 may be incident on the bottom surface BW of the second monomer 512 of the filling pattern 510. The third monomer 513 of the filling pattern 510 may be arranged so that it overlaps with the third emission area LA3 of the third organic light emitting element ED3, and the light L emitted from the third emission area LA3 may be incident on the bottom surface BW of the third monomer 513 of the filling pattern 510.

[0176] The first monomer 511 of the filling pattern 510 may be disposed so that it overlaps with the first light exit area PA1. The light L emitted from the first emission area LA1 may be incident on the bottom surface BW of the first monomer 511 of the filling pattern 510, and may be incident on the first wavelength conversion pattern 341 disposed in the first light exit area PA1 through the top surface UW of the first monomer 511 of the filling pattern 510. The second monomer 512 of the filling pattern 510 may be disposed so that it overlaps with the second light exit area PA2. The light L emitted from the second emission area LA2 may be incident on the bottom surface BW of the second monomer 512 of the filling pattern 510, and may be incident on the second wavelength conversion pattern 343 disposed in the second light exit area PA2 through the top surface UW of the second monomer 512 of the filling pattern 510. The third monomer 513 of the filling pattern 510 may be disposed so that it overlaps with the third light exit area PA3. The light L emitted from the third emission area LA3 may be incident on the bottom surface BW of the third monomer 513 of the filling pattern 510 , and may be incident on the light-transmitting pattern 345 disposed in the third light exiting area PA3 through the top surface UW of the third monomer 513 of the filling pattern 510 .

[0177] The light L emitted from the first emission area LA1, the second emission area LA2, and the third emission area LA3 may be incident on the first monomer 511, the second monomer 512, and the third monomer 513 of the filling pattern 510, respectively. The first monomer 511 of the filling pattern 510 may provide a path for the light L so that the light L emitted from the first emission area LA1 is incident on the first wavelength conversion pattern 341, but not on the second wavelength conversion pattern 343. The second monomer 512 of the filling pattern 510 may provide a path for the light L so that the light L emitted from the second emission area LA2 is incident on the second wavelength conversion pattern 343, but not on the first wavelength conversion pattern 341. The third monomer 513 of the filling pattern 510 may provide a path for the light L so that the light L emitted from the third emission area LA3 is incident on the light-transmitting pattern 345, but not on the second wavelength conversion pattern 343. Therefore, the filling pattern 510 may prevent or reduce the light L output from the first substrate 100 from reaching another adjacent light emission area PA1, PA2, and PA3 to cause color mixing.

[0178] The length of the top surface UW of each cell of the filling pattern 510 measured in, for example, the first direction d1 may be equal to the length of its bottom surface BW measured in the same direction. For example, the area of ​​the top surface UW of each cell of the filling pattern 510 may be equal to the area of ​​the bottom surface BW. Fig.10) may be perpendicular to the upper surface of the first substrate 100. The side surface 510s of the filling pattern 510 may form an interface with the filling material 520 described in more detail later, and may reflect at least a portion of the light L incident on the side surface 510s. Therefore, the amount of light L incident on the second substrate 300 among the light L passing through the filling pattern 510 may be increased. However, it will be understood that the present disclosure is not limited to this. In one or more embodiments, the filling pattern 510 may be arranged to cover the entire top surface of the encapsulation layer 170. A more detailed description thereof will be given below.

[0179] The monomers of the filling pattern 510 are spaced apart from each other, and a height H of the filling pattern 510 (measured in a third direction d3 perpendicular to and / or intersecting the first direction d1) may be less than a thickness of the filling layer 500 measured in the third direction d3. Therefore, there may be a space between the monomers of the filling pattern 510 and between the top surface UW of the filling pattern 510 and the second substrate 300. The space may be filled with a filling material 520.

[0180] The filling pattern 510 and the filling material 520 may include a light-transmitting material so that the light L output from the first substrate 100 passes through the filling layer 500 to be incident on the second substrate 300 .

[0181] In addition, as described above, the filling pattern 510 may include a material having a high refractive index. The filling pattern 510 disposed between the first substrate 100 and the second substrate 300 may reduce the refractive index difference between the first substrate 100 and the second substrate 300. When the light L output from the first substrate 100 passes through the filling pattern 510 to be incident on the second substrate 300, the difference between the incident angle and the refractive angle becomes smaller as the refractive index difference decreases, so that the light can be effectively incident on the second substrate 300.

[0182] In one or more exemplary embodiments, the filling material 520 may include a material having a refractive index lower than that of the first substrate 100 and the second substrate 300. The filling pattern 510 having a relatively large refractive index and the filling material 520 having a relatively small refractive index may be provided in the filling layer 500. The light L output from the first substrate 100 may be incident on the second substrate 300 through the filling pattern 510 having a small refractive index difference. In addition, an interface may exist between the side surface 510s of the filling pattern 510 and the filling material 520. The light L incident on the interface may be reflected due to the refractive index difference and may be incident on the second substrate 300.

[0183] In one or more embodiments, the filling pattern 510 may have a height equal to the gap between the first substrate 100 and the second substrate 300 to absorb impact so that the first substrate 100 and the second substrate 300 may be reliably bonded together.

[0184] The filling pattern 510 may be formed of a silicon-based organic material, an epoxy-based organic material, and / or an epoxy-acrylic organic material without limitation. The filling material 520 may be an air layer or a gas layer containing nitrogen and / or an inert gas such as argon or various gas mixtures. However, it will be understood that the present disclosure is not limited thereto.

[0185] In one or more exemplary embodiments, the filling pattern 510 may be formed of a material having a refractive index greater than 1.5 so that total reflection may effectively occur at an interface with the filling material 520 .

[0186] For example, when the filling material 520 includes an air layer or a gas layer, the refractive index of the filling material 520 may be substantially close to 1.0. That is, the refractive index difference between the filling pattern 510 and the filling material 520 may be 0.5 or more, and total reflection may effectively occur at the interface between the filling pattern 510 and the filling material 520.

[0187] However, it will be understood that the present disclosure is not limited thereto. The filling material 520 is not specifically limited here, as long as it includes a low-refractive material layer in addition to the air layer and the refractive index difference between the filling pattern 510 and the filling material 520 is 0.3 or greater. For example, the filling material 520 can be ethylhexyl acrylate, pentafluoropropyl acrylate, polyethylene glycol dimethacrylate and / or ethylene glycol dimethacrylate, etc., without limitation. In this case, the filling material 520 can more effectively (or appropriately) absorb the impact between the first substrate 100 and the second substrate 300.

[0188] According to one or more exemplary embodiments, the filling pattern 510 may include the same material as that in the encapsulation layer 170 , and the material may be hexamethyldisiloxane (HMDSO).

[0189] Light L emitted from each of the organic layers OL1, OL2, and OL3 of the first substrate 100 may be incident on the filling layer 500 through the common electrode CE and the encapsulation layer 170. If, in the filling layer 500, there is no filling pattern 510 and only a filling material 520 having a low refractive index exists, the light L is reflected at the boundary between the encapsulation layer 170 and the filling layer 500, so that the light extraction efficiency may be reduced. In addition, if the filling pattern 510 includes a material different from that of the encapsulation layer 170, the path of the light L emitted from the first substrate 100 may be changed or reflected according to the refractive index difference. As a result, the intensity of the light emitted from the second substrate 300 may be reduced or color mixing may occur.

[0190] On the contrary, when the filling pattern 510 includes the same material as the material of the encapsulation layer 170, the light L output from the first substrate 100 can travel from the encapsulation layer 170 to be incident on the filling pattern 510 without being almost reflected. Therefore, most of the light L output from the first substrate 100 can be incident on the second substrate 300, and the amount of light L incident on other adjacent light exit areas can be reduced, thereby preventing or reducing color mixing. In one or more embodiments, the filling pattern 510 can be formed by forming the encapsulation layer 170 and performing a continuous process. A more detailed description thereof will be given below.

[0191] According to one or more exemplary embodiments of the present disclosure, the filling pattern 510 may include a first pattern portion 510 a having a bent portion GP formed in at least a portion thereof.

[0192] As described above, when the filling pattern 510 includes a material having a high refractive index (e.g., the same material as the encapsulation layer 170), light emitted from the organic light emitting elements ED1, ED2, and ED3 may be hardly reflected and may be incident on the filling pattern 510. As shown in the drawings, the filling material 520 may be disposed between the top surface UW of the filling pattern 510 and the second substrate 300, and the light L may be reflected at the interface between the top surface UW of the filling pattern 510 and the filling material 520. When this occurs, the light extraction efficiency of the light L output from the first substrate 100 may be slightly reduced.

[0193] According to one or more exemplary embodiments of the present disclosure, the filling pattern 510 includes a first pattern portion 510a having a bent portion GP formed therein, so that light L incident on the filling pattern 510 may be scattered by the bent portion GP. The light L incident on the bent portion GP of the filling pattern 510 at a certain incident angle may be scattered, and the scattered light L (see Fig.10 ) may not be finally reflected from the top surface UW of the filling pattern 510 but may be incident on the second substrate 300 .

[0194] In the drawings, the filling pattern 510 includes only the first pattern portion 510a. In other words, in some embodiments, the curved portion GP may be formed on the entire portion of the filling pattern 510. However, it will be understood that the present disclosure is not limited thereto. As will be described in more detail later, the filling pattern 510 may further include a second pattern portion 510b located on the first pattern portion 510a without the curved portion GP.

[0195] The first pattern portion 510a has a curved portion GP formed in at least a portion thereof. The curved portion GP can scatter light L incident at a certain incident angle so that the light L has a plurality of refraction angles. In the accompanying drawings, the curved portion GP is formed only on the top surface UW of the filling pattern 510 (or the first pattern portion 510a). However, it will be understood that the present disclosure is not limited thereto. The curved portion GP may be partially formed on the side surface 510s of the first pattern portion 510a or formed inside the first pattern portion 510a.

[0196] When forming the first pattern portion 510a, the bent portion GP may be formed when the material for forming the bent portion GP reacts with the material of the first pattern portion 510a to form another material layer. For example, the material of the bent portion GP may be different from the material of the other portions of the first pattern portion 510a or the material of the second pattern portion 510b. A more detailed description thereof will be given later.

[0197] In the following, reference will be made to Figures 8 to 10 The path of light L emitted from the organic light emitting element ED is described.

[0198] Figure 8 is an enlarged view for illustrating a light path in a display device according to a comparative example. Fig. 9 and Fig.10 It is used to show Figure 4 A magnified view of the light path in area A.

[0199] First refer to Figure 8 , if there is no filling pattern formed on the first substrate 100, the encapsulation layer 170 may form an interface with the filling material 520' (e.g., an air layer). In this case, most of the light L emitted from the organic light emitting element ED may be incident in the air layer from the encapsulation layer 170 and may travel toward the second substrate 300. However, a relatively large amount of light L cannot be incident in the air layer but may be reflected. For example, when the first light La, the second light Lb, the third light Lc, and the fourth light Ld are emitted from the organic light emitting element ED, the first light La, the second light Lb, and the fourth light Ld are not incident in the air layer having a lower refractive index than that of the encapsulation layer 170, but may be reflected ( Figure 8 Only the third light Lc may be refracted at the interface between the encapsulation layer 170 and the air layer and travel through the air layer ( Figure 8 According to this comparative example, even if the first light La, the second light Lb, the third light Lc, and the fourth light Ld are emitted from the organic light emitting element ED, only the third light Lc passes through the air layer and is incident on the second substrate 300.

[0200] On the contrary, refer to Fig. 9, if there is a filling pattern 510 formed on the first substrate 100, the encapsulation layer 170 may form an interface with the filling pattern 510. Then, the first light La, the second light Lb, the third light Lc, and the fourth light Ld emitted from the organic light emitting element ED may be incident on the filling pattern 510 without being substantially reflected at the interface. When the filling pattern 510 includes a material having a small refractive index difference with the encapsulation layer 170 or a material having substantially the same refractive index, the light La, the light Lb, the light Lc, and the light Ld emitted from the organic light emitting element ED may be effectively incident on the filling pattern 510.

[0201] Next refer to Fig.10 , Fig. 9 The light La', light Lb', light Lc', and light Ld' refracted at the interface between the filling pattern 510 and the encapsulation layer 170 may pass through the filling pattern 510 and may be incident on the interface between the filling pattern 510 and the filling material 520. Among them, the first light La' and the fourth light Ld' incident on the side surface 510s where the bent portion GP is not formed in the filling pattern 510 may intersect the filling material 520 having a low refractive index to be reflected at the interface ( Fig.10 The reflected first light La" and the reflected fourth light Ld" may be incident on the second substrate 300 through the bent portion GP of the filling pattern 510. Specifically, when the monomers of the filling pattern 510 are disposed on the encapsulation layer 170 so that they are separated from each other, the light L' reflected at the interface with the filling material 520 disposed between the monomers may travel toward the upper side of the filling pattern 510. Therefore, light L emitted from one of the organic light emitting elements ED (for example, light L emitted from the first organic light emitting element ED1) may be reflected at the side surface 510s of the filling pattern 510, so that the light L may be incident on the first wavelength conversion pattern 341 without being incident on the second wavelength conversion pattern 343.

[0202] Meanwhile, the second light Lb′ and the third light Lc′ incident on the bent portion GP of the filling pattern 510 may be scattered at the bent portion GP ( Fig.10 A portion of the scattered second light Lb" and third light Lc" may be incident on the filling material 520, and the other portion thereof may be reflected back to the filling pattern 510. Fig.10 It can be seen that Figure 8, the filling pattern 510 including the first pattern portion 510a having the curved portion GP formed thereon and having a small refractive index difference with the encapsulation layer 170 can transmit more light L to the second substrate 300. In addition, when no curved portion GP is formed on the top surface UW of the filling pattern 510, at least a portion of the light L passing through the filling pattern 510 is reflected again. The curved portion GP of the filling pattern 510 can scatter at least a portion of the reflected light L' and transmit the scattered light L" toward the second substrate 300. Therefore, the filling pattern 510 including the first pattern portion 510a having the curved portion GP formed thereon can increase the amount of light L emitted from the organic light emitting element ED and incident on the second substrate 300. In addition, as described above, since the monomers of the filling pattern 510 are separated from each other, it is possible to prevent or reduce color mixing of the light L emitted from the organic light emitting element ED.

[0203] According to one or more exemplary embodiments of the present disclosure, when the filling pattern 510 includes hexamethyldisiloxane, the bending portion GP may be formed by reacting the hexamethyldisiloxane with a nitrogen-containing molecule, and the bending portion GP may contain nitrogen.

[0204] When the filling pattern 510 includes an organic material, for example, hexamethyldisiloxane, the filling pattern 510 may have a relatively flexible property. As will be described later, during the process of manufacturing the display device 10, in order to form the filling pattern 510 on the encapsulation layer 170, a hexamethyldisiloxane precursor may be injected synchronously or simultaneously with the nitrogen-containing molecules. A precursor may be deposited on the encapsulation layer 170 to react with the nitrogen-containing molecules so that the surface in the first pattern portion 510a may be partially curved. Compared with hexamethyldisiloxane as an organic material, the precursor reacts with nitrogen to be partially cured, and the cured portion may be curved. Therefore, when the precursor reacts with nitrogen, some portions are curved to form a curved portion GP. As a result, the content of nitrogen in the first pattern portion 510a may be increased.

[0205] According to one or more exemplary embodiments of the present disclosure, the content of nitrogen in the first pattern portion 510a of the filling pattern 510 may be greater than the content of nitrogen in the second pattern portion 510b. The bent portion GP containing nitrogen may be formed at the first pattern portion 510a, but not at the second pattern portion 510b. When the filling pattern 510 is formed on the encapsulation layer 170, nitrogen-containing molecules may be injected when the first pattern portion 510a is formed, but not when the second pattern portion 510b is formed. The nitrogen content in the filling pattern 510 in the first pattern portion 510a may be greater than the nitrogen content in the filling pattern 510 in the second pattern portion 510b.

[0206] When the precursor is deposited, the nitrogen-containing molecules may not be injected into the second pattern portion 510b, or a very small amount of nitrogen-containing molecules may be injected into the second pattern portion 510b. Unlike the first pattern portion 510a, since there is almost no area where the precursor reacts with nitrogen to be cured, the second pattern portion 510b may have a relatively flat surface on the first pattern portion 510a including hexamethyldisiloxane. In addition, compared with the first pattern portion 510a, the second pattern portion 510b including the organic material may have viscosity and adhesion so that the second substrate 300 may be reliably attached. A more detailed description thereof will be given later.

[0207] The bent portion GP according to one or more exemplary embodiments of the present disclosure includes at least one convex portion protruding upward relative to a straight line connecting one end thereof with an opposite end and at least one concave portion protruding downward. The convex portion and the concave portion may be curved portions having a predetermined (or set) curvature formed by the bent portion GP of the first pattern portion 510a.

[0208] It will be understood that in the curved portion GP of the first pattern portion 510a, the ratio and shape of the convex portion to the concave portion may be changed. For example, the gap between the convex portions of the curved portion GP (i.e., the period of the curved portion GP) may affect the degree to which the incident light L is scattered. The shorter the period of the curved portion GP, ​​the greater the scattering angle of the incident light L, and the amount of light directed to the second substrate 300 may be increased. In one or more exemplary embodiments, the gap between the convex portions of the curved portion GP (i.e., the period of the curved portion GP) may be in the range of 0.5 μm to 1.5 μm. The curved portion GP having the period in the above range may effectively (or appropriately) provide light to the second pattern portion 510b and the second substrate 300 by scattering the light incident on the first pattern portion 510a.

[0209] Fig.11 According to another exemplary embodiment of the present disclosure Figure 3 A cross-sectional view of the display device taken along line IV-IV'.

[0210] As described above, the filling pattern 510 according to the exemplary embodiment of the present disclosure may further include a second pattern portion 510b having no bent portion GP on the first pattern portion 510a. The second pattern portion 510b may include a material substantially the same as that of the first pattern portion 510a, such as hexamethyldisiloxane (HMDSO), and may reduce the refractive index difference between the first pattern portion 510a and the second substrate 300.

[0211] Reference Fig.11, the filling pattern 510 of the display device 10 may further include a first pattern portion 510a and a second pattern portion 510b disposed on the first pattern portion 510a. The second pattern portion 510b does not have a bent portion GP, ​​and light L scattered at the bent portion GP of the first pattern portion 510a may be incident on the second pattern portion 510b. The second pattern portion 510b may provide a path for the scattered light L so that the scattered light L may be incident on the second substrate 300.

[0212] The second pattern portion 510b may extend on (be located on) the first pattern portion 510a. The side surface of the second pattern portion 510b may be aligned with the side surface of the first pattern portion 510a to form a side surface 510s of the filling pattern 510. Therefore, the cross-sectional shape of the filling pattern 510 may be substantially rectangular.

[0213] The second pattern portion 510b may be disposed on the first pattern portion 510a so that the top surface of the second pattern portion 510b may contact the second substrate 300. For example, the height H of the filling pattern 510 including the second pattern portion 510b may be equal to the thickness of the filling layer 500. Therefore, the filling material 520 for filling the space between the cells of the filling pattern 510 separated from each other may substantially form a pattern in the filling layer 500. The filling pattern 510 includes the second pattern portion 510b so that the bottom surface and the top surface of the filling pattern 510 may contact the first substrate 100 and the second substrate 300, respectively. The filling pattern 510 may absorb impact so that the second substrate 300 may be reliably attached to the first substrate 100.

[0214] Fig.12 According to another exemplary embodiment of the present disclosure Figure 1 A cross-sectional view of the display device taken along line II-II'.

[0215] Reference Fig.12 , it can be seen that, with Figure 2 Unlike the example shown in FIG. 5 , the area filled with the filling material 520 forms a pattern. Figure 2 In the exemplary embodiment shown in FIG. 5 , the filling pattern 510 includes only the first pattern portion 510 a, so the space between the top surface of the first pattern portion 510 a and the second substrate 300 may also be filled with the filling material 520. Fig.12In the exemplary embodiment shown in FIG. 5 , the filling pattern 510 includes a first pattern portion 510a and a second pattern portion 510b, and thus the top surface of the filling pattern 510 contacts the second substrate 300. Therefore, the space between the filling pattern 510 and the second substrate 300 is not filled with the filling material 520, but the space between the monomers of the filling pattern 510 is filled with the filling material 520. That is, the filling material 520 may form a pattern in the filling layer 500.

[0216] The second pattern portion 510b may include the same material as that of the first pattern portion 510a, but may not have the bent portion GP. Therefore, light L' incident on the bent portion GP formed at the boundary between the first pattern portion 510a and the second pattern portion 510b is scattered, and most of the scattered light L" may travel toward the second pattern portion 510b.

[0217] Fig.13 It is used to show Fig.11 A magnified view of the light path in area A.

[0218] Reference Fig.13 ,and Fig.10 Unlike the embodiment of the present invention, the second pattern portion 510b may be further disposed on the first pattern portion 510a. The second light Lb' and the third light Lc' emitted from the organic light emitting element ED and incident on the bent portion GP of the first pattern portion 510a may be scattered. The first pattern portion 510a and the second pattern portion 510b may include the same material and have the same refractive index or almost the same refractive index. Therefore, the second light Lb' and the third light Lc' to be scattered at the bent portion GP may be scattered while maintaining the traveling direction. That is, unlike Fig.10 Compared to the exemplary embodiment shown in , a larger amount of scattered second light Lb" and third light Lc" may travel toward the second pattern portion 510b. Light incident on the second pattern portion 510b may be incident on the second substrate 300. Since the refractive index difference between the second substrate 300 and the second pattern portion 510b is small, most of the light may be incident on the second substrate 300. As a result, the light extraction efficiency of the display device 10 may be improved.

[0219] The second pattern portion 510b includes a material substantially the same as that of the first pattern portion 510a, and the second pattern portion 510b and the first pattern portion 510a may be formed in a continuous process. However, as described above, the first pattern portion 510a may be formed by injecting a certain injection gas so that the gas reacts with the material of the first pattern portion 510a to form the bent portion GP. On the other hand, the second pattern portion 510b is not injected with gas, and thus the bent portion GP is not formed on the second pattern portion 510b.

[0220] In one or more embodiments, during the process of manufacturing the filling pattern 510, the first pattern portion 510a may be formed by simultaneously injecting a precursor material of the filling pattern 510 together with an injection gas, and the second pattern portion 510b may be formed by injecting a precursor material only on the first pattern portion 510a. Therefore, the filling pattern 510 may have different contents of the injection gas in the first pattern portion 510a and in the second pattern portion 510b. A more detailed description thereof will be given later.

[0221] As mentioned above, the encapsulation layer 170 is not limited to Figure 4 In some embodiments, encapsulation layer 170 may be composed of multiple layers, and the top surface may be substantially flat.

[0222] Fig.14 According to another exemplary embodiment of the present disclosure Figure 3 A cross-sectional view of the display device taken along line IV-IV'.

[0223] Reference Fig.14 , the encapsulation layer 170 according to an exemplary embodiment of the present disclosure may include a first inorganic encapsulation layer 171 , an organic encapsulation layer 173 , and a second inorganic encapsulation layer 175 stacked in this order on the common electrode CE.

[0224] The first inorganic encapsulation layer 171 is disposed on the common electrode CE of the organic light emitting element ED. The first inorganic encapsulation layer 171 is disposed along the common electrode CE on which a step or concave-convex pattern is formed. Therefore, the first inorganic encapsulation layer 171 may have a shape substantially the same as that of the common electrode CE. The first inorganic encapsulation layer 171 may be disposed to cover the common electrode CE to protect the common electrode CE.

[0225] The organic encapsulation layer 173 is disposed on the first inorganic encapsulation layer 171. The organic encapsulation layer 173 is disposed to cover the first inorganic encapsulation layer 171 and may be formed thicker than the first inorganic encapsulation layer 171. The organic encapsulation layer 173 including an organic material is disposed to cover the first inorganic encapsulation layer 171 having a step or concavo-convex pattern formed thereon and may have a substantially flat top surface. For example, the organic encapsulation layer 173 may cover the level difference of the first inorganic encapsulation layer 171. The second inorganic encapsulation layer 175 is disposed on the organic encapsulation layer 173. The second inorganic encapsulation layer 175 may form a flat surface along the top surface of the organic encapsulation layer 173. Figure 4 The encapsulation layer 170 is different, Fig.14 The encapsulation layer 170 may have a substantially flat top surface. Therefore, the filling pattern 510 disposed on the encapsulation layer 170 has a flat bottom surface, so that when the first substrate 100 and the second substrate 300 are attached together, the filling pattern 510 can stably support the second substrate 300.

[0226] Each of the first and second inorganic encapsulating layers 171 and 175 may be made of silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, silicon oxynitride (SiON), and / or lithium fluoride, or the like.

[0227] The organic encapsulating layer 173 may be made of acrylic resin, methacrylic resin, polyisoprene resin, vinyl resin, epoxy resin, urethane resin, cellulose resin and / or perylene resin. However, it will be understood that the present disclosure is not limited thereto.

[0228] In the following, reference will be made to Figures 15 to 18 To describe manufacturing Fig.14 The second substrate 300 of the display device 10 is the same as the second substrate 300 of the other exemplary embodiments described above. Fig.14 The first substrate 100 of the illustrated exemplary embodiment has a multi-layered encapsulation layer 170. In the following description, a method for forming the filling layer 500 of the display device 10 will be described in more detail, and configurations and structures of other elements will not be provided.

[0229] Figures 15 to 18 is used to show the manufacturing Fig.14 A cross-sectional view of some process steps (actions) of a method for displaying a device.

[0230] The method for manufacturing the display device 10 may include preparing a first substrate 100 , forming a filling pattern layer 510 ′ on the first substrate 100 , and patterning at least a portion of the filling pattern layer 510 ′ to form a filling pattern 510 .

[0231] First, refer to Fig.15 and Fig.16 , prepare a first substrate 100, and form a filling pattern 510 on the first substrate 100. Fig.14 As in the first substrate 100, the first substrate 100 may include an encapsulation layer 170 having a plurality of layers. However, it will be understood that the present disclosure is not limited thereto. Figure 4 As shown in FIG. 1 , a single encapsulation layer 170 may be formed on the common electrode CE of the organic light emitting elements ED1 , ED2 , and ED3 .

[0232] Forming the filling pattern layer 510 ′ on the encapsulation layer 170 of the first substrate 100 may include forming a first pattern layer 510 a ′ including a bent portion GP formed in at least a portion thereof and forming a second pattern layer 510 b ′ without the bent portion GP on the first pattern layer 510 a ′.

[0233] First, a first pattern layer 510a' is formed on the encapsulation layer 170. The first pattern layer 510a' may be formed on the entire surface of the encapsulation layer 170 to cover the encapsulation layer 170. A second pattern layer 510b' is formed on the first pattern layer 510a' to cover the first pattern layer 510a', thereby forming a filling pattern layer 510'.

[0234] In the drawings, the encapsulation layer 170 has a substantially flat top surface having substantially no level difference, and thus the bottom surface of the first pattern layer 510a' has a substantially flat surface. However, it will be understood that the present disclosure is not limited thereto. For example, even when Figure 4 When a level difference is formed on the encapsulation layer 170 in the display device 10, the first pattern layer 510a' may also cover the level difference. Therefore, the bottom surface of the first pattern layer 510a' may have a step or concave / convex pattern conforming to the shape of the encapsulation layer 170.

[0235] The first pattern layer 510a' and the second pattern layer 510b' may be formed by photolithography, an inkjet process, and / or a chemical vapor deposition (CVD) technique. However, it will be understood that the present disclosure is not limited thereto.

[0236] As described above, the first pattern portion 510a and the second pattern portion 510b may include substantially the same material, and thus the first pattern layer 510a' and the second pattern layer 510b' may be formed via a continuous process. It should be noted that the first pattern layer 510a' and the second pattern layer 510b' may be distinguished from each other depending on whether the injection gas is injected together with the precursor material.

[0237] In one or more exemplary embodiments, the first pattern layer 510a' and the second pattern layer 510b' may include hexamethyldisiloxane (HMDSO) and may be formed by chemical vapor deposition (CVD) technology. 2 The first pattern layer 510a' may be formed by injecting a hexamethyldisiloxane (HMDSO) precursor HP.

[0238] In one or more embodiments, the first pattern portion 510a and the second pattern portion 510b may include hexamethyldisiloxane, and may be formed by a chemical vapor deposition (CVD) technique. As described above, when silicon (Si) of a hexamethyldisiloxane (HMDSO) precursor HP reacts with nitrogen (N) so that a portion of them is solidified, the bent portion GP formed in the first pattern portion 510a may be formed. That is, the bent portion GP of the first pattern portion 510a may partially include silicon nitride (SiN) containing nitrogen (N).

[0239] When forming the first pattern layer 510a', a hexamethyldisiloxane (HMDSO) precursor HP may be provided on the encapsulation layer 170, and the hexamethyldisiloxane (HMDSO) precursor HP may partially react with the nitrous oxide NP injected together. The hexamethyldisiloxane precursor HP may react with the nitrous oxide NP to form silicon nitride, and the silicon nitride may form a bent portion GP on the first pattern layer 510a'.

[0240] Since silicon nitride (which is an inorganic material) is formed when hexamethyldisiloxane (which is an organic material) is deposited, silicon nitride can form a relatively firm surface compared to hexamethyldisiloxane having fluidity. Hexamethyldisiloxane is partially solidified by silicon nitride, and the solidified portion can be formed to be curved. As a result, a curved portion GP can be formed on at least a portion of the first pattern layer 510a'. The first pattern layer 510a' may include nitrogen having a higher content than that of the second pattern layer 510b' described later. Nitrogen may be included in the curved portion GP formed on the first pattern layer 510a'.

[0241] Then, if Fig.16 As shown in , a hexamethyldisiloxane precursor HP is deposited on a first pattern layer 510a' to form a second pattern layer 510b'. When the second pattern layer 510b' is formed, almost no nitrous oxide NP is injected. Unlike the first pattern layer 510a', a portion of the second pattern layer 510b' is not cured, and thus no curved portion GP is formed. As a result, the second pattern layer 510b' can form a relatively flat surface, and can include hexamethyldisiloxane (which is an organic material) to exhibit viscosity and adhesion. As described above, the nitrogen content in the first pattern layer 510a' is higher than the nitrogen content in the second pattern layer 510b'.

[0242] Then, refer to Fig.17 and Fig.18 , the filling pattern layer 510' is patterned to form the filling pattern 510. The filling pattern layer 510' is patterned by using a suitable mask M. However, it will be understood that the present disclosure is not limited thereto.

[0243] First, if Fig.17 As shown in , the mask M may be placed above the first substrate 100 and aligned with the first substrate 100. The mask M may include a light-blocking portion Ma for blocking all light and a light-transmitting portion Mb for transmitting all light. The light-blocking portion Ma may overlap with the organic light-emitting elements ED1, ED2, and ED3 of the first substrate 100. The cross-sectional area of ​​the light-blocking portion Ma may be equal to the cross-sectional area of ​​the light-emitting regions PA1, PA2, and PA3. The light-transmitting portion Mb may overlap with the bank layer 150 of the first substrate 100. The cross-sectional area of ​​the light-transmitting portion Mb may be equal to the cross-sectional area of ​​the non-light-emitting region PB.

[0244] As described in more detail later, the filling pattern 510 may be formed below the region where the filling pattern layer 510' overlaps the light-blocking portion Ma. That is, the shape of the filling pattern 510 may vary according to the light-blocking portion Ma. In order to form a monomer of the filling pattern 510 separated from each other, the light-blocking portion Ma is composed of portions separated from each other, and the light-transmitting portion Mb may be located between them. However, it will be understood that the present disclosure is not limited thereto.

[0245] When forming the filling pattern 510, the exposure light L_ex may be irradiated onto the first substrate 100 from above the mask M. A portion of the exposure light L_ex is blocked by the light blocking portion Ma of the mask M, and the other exposure light L_ex passes through the light transmitting portion Mb and irradiates onto the filling pattern layer 510' located on the first substrate 100. For example, the exposure light L_ex may be selectively irradiated onto the filling pattern layer 510' through the mask M.

[0246] In the portion of the filling pattern layer 510' onto which the exposure light L_ex is selectively irradiated through the light-transmitting portion Mb, the bonds of the polymer are broken. Therefore, the portion of the filling pattern layer 510' irradiated by the exposure light L_ex can be removed through a subsequent process. Fig.18 As shown in FIG. 5 , a portion located under the light-transmitting portion Mb and irradiated by the exposure light L_ex is removed through a subsequent process, while other portions not irradiated by the exposure light L_ex may not be removed and form a filling pattern 510 .

[0247] Therefore, the shape of the filling pattern 510 can be adjusted by adjusting the light-blocking portion Ma and the light-transmitting portion Mb of the mask M. As described above, the size, position, etc. of the filling pattern 510 can be adjusted by adjusting the position and diameter of the light-transmitting portion Mb of the mask M. In the accompanying drawings, the light-blocking portion Ma overlaps with the organic light-emitting element ED and forms a cross-sectional area that is the same as the cross-sectional area of ​​the light-emitting regions PA1, PA2, and PA3. In this case, since the portion of the filling pattern layer 510' located below the light-blocking portion Ma is not removed and the filling pattern 510 is formed, the filling pattern 510 overlaps with the organic light-emitting element ED and may have a cross-sectional area that is the same as the cross-sectional area of ​​the light-emitting regions PA1, PA2, and PA3. However, it will be understood that the present disclosure is not limited thereto.

[0248] The shapes of the light-blocking portion Ma and the light-transmitting portion Mb of the mask M are not limited to the shapes shown in the drawings, and may be changed to adjust the position, size, and / or shape of the filling pattern 510. For example, although the filling pattern 510 having a substantially rectangular shape is shown in the drawings, the filling pattern 510 may have an inclined side surface.

[0249] The portion of the filling pattern layer 510' removed by the light irradiated through the light-transmitting portion Mb of the mask M may be filled with a filling material 520. For example, the filling material 520 may be an air layer as described above, but is not limited thereto. The removed portion may be filled with a material having a lower refractive index than the filling pattern 510.

[0250] Subsequently, a filling pattern 510 is formed on the first substrate 100, and then the first substrate 100 is attached to the second substrate 300, thereby manufacturing the display device 10. During the process of attaching the first substrate 100 to the second substrate 300, a space between cells of the filling pattern 510 is filled with a filling material 520, and the first substrate 100 is coupled to the second substrate 300 by a sealing member 550, thereby manufacturing the display device 10.

[0251] In the following, reference will be made to Figures 19 to 21 To describe the filling pattern according to various exemplary embodiments. In addition to the filling pattern having different structures, Figures 19 to 21 The display device and Fig.14 The display device 10 of FIG. 1 is substantially the same as that of FIG. 1. Therefore, the description will be focused on the differences, and redundant description will not be provided.

[0252] Figures 19 to 21 According to various exemplary embodiments of the present disclosure Figure 3 A cross-sectional view of the display device taken along line IV-IV'.

[0253] As described above, the shape of the filling pattern 510 is not limited to Figure 4 or Fig.14 The shape of the filling pattern 510 is shown in FIG. In one or more embodiments, the side surface of the filling pattern 510 is not necessarily perpendicular to the first substrate 100 and may be inclined toward one side or may protrude outward with a predetermined (or set) curvature.

[0254] In one or more exemplary embodiments, the side surfaces of the filling pattern 510 may be inclined such that the upper surface and the lower surface of the filling pattern 510 may have different lengths measured in one direction (eg, the first direction d1 ).

[0255] Reference Fig.19 , the filling pattern 510_1 of the display device 10_1 may be formed such that the length of the bottom surface BW measured in the first direction d1 is greater than the length of the top surface UW, and the side surface 510s_1 is inclined. Therefore, the angle θ formed by the first substrate 100 and the side surface 510s_1 of the filling pattern 510_1 is p It may be an acute angle less than 90 degrees. That is, the filling pattern 510_1 may have a trapezoidal shape in which a bottom surface BW thereof is longer than a top surface UW thereof.

[0256] As described above, the area of ​​the top surface UW of the filling pattern 510_1 may be substantially equal to or greater than the area of ​​each of the light exit regions PA1, PA2, and PA3. The light L output from the first substrate 100 may pass through the filling pattern 510 and may be incident on the second substrate 300 through the top surface UW. Since the area of ​​the top surface UW is equal to or greater than the area of ​​each of the light exit regions PA1, PA2, and PA3, the light L may be effectively (or appropriately) incident on the plurality of wavelength conversion patterns 341 and 343 and the light-transmitting pattern 345.

[0257] The area of ​​the bottom surface BW of the filling pattern 510_1 may not be equal to the area of ​​each of the light exiting areas PA1, PA2, and PA3. Fig.19 , the area of ​​the bottom surface BW of the filling pattern 510_1 is larger than the area of ​​each of the light exiting areas PA1, PA2, and PA3. For example, the side surface 510s_1 of the filling pattern 510_1 may be inclined from the bottom surface BW to the top surface UW toward the inside of the filling pattern 510_1. The angle θ formed by the side surface 510s_1 of the filling pattern 510_1 and the first substrate 100 is p It may be an acute angle (less than 90 degrees). In this case, a greater amount of light L may be incident on the bottom surface BW of the filling pattern 510_1.

[0258] The bottom surface BW of the filling pattern 510_1 may contact the bottom surface BW of another adjacent filling pattern 510_1. The space between the adjacent filling patterns 510_1 may become larger toward the top surface UW and may be filled with the filling material 520_1. The light L incident through the relatively wide bottom surface BW may be reflected at the boundary between the filling material 520_1 and the filling pattern 510_1 and may be incident on the second substrate 300.

[0259] Reference Fig. 20 , the filling pattern 510_2 of the display device 10_2 may be formed such that the length of the bottom surface BW measured in the first direction d1 is less than the length of the top surface UW, and the side surface 510s_2 is inclined. Therefore, the angle θ formed by the first substrate 100 and the side surface 510s_2 of the filling pattern 510_2 is q The angle may be an obtuse angle (greater than 90 degrees). For example, the filling pattern 510_2 may have an inverted trapezoidal shape whose bottom surface BW is shorter than its top surface UW.

[0260] The area of ​​the bottom surface BW of the filling pattern 510_2 may be smaller than the area of ​​each of the light emission areas PA1, PA2, and PA3. The area of ​​the bottom surface BW of the filling pattern 510_2 may be larger than the area of ​​each of the emission areas LA1, LA2, and LA3 of the organic light emitting element ED so that the light emitted from the first substrate 100 does not escape. When the angle θ formed by the first substrate 100 and the side surface 510s_2 of the filling pattern 510_2 is q When the angle is greater than 90 degrees, the angle at which the light L emitted from the organic light emitting element ED is incident on the side surface 510s_2 of the filling pattern 510_2 may become larger. Therefore, a larger amount of light L may be totally reflected at the boundary between the filling pattern 510_2 and the filling material 520_2 and incident on the second substrate 300.

[0261] and Figure 4 The display device 10 is different, according to Fig.19 and Fig. 20 The filling pattern of the exemplary embodiment has the bottom surface BW and the top surface UW having different lengths and the inclined side surface, so that a greater amount of light L may be incident on the second substrate 300 .

[0262] Reference Fig.21, the filling pattern 510_3 of the display device 10_3 has a top surface UW and a bottom surface BW of substantially the same length measured in one direction (e.g., in the first direction d1), and a portion between the top surface UW and the bottom surface BW of each cell of the filling pattern 510_3 may protrude into a space between adjacent cells. For example, at least a portion of a side surface 510s_3 of the filling pattern 510_3 may protrude toward the outside of the filling pattern 510_3.

[0263] Since a portion of the side surface 510s_3 of the filling pattern 510_3 protrudes, the outer surface may be partially curved with a certain (set) curvature, and the filling pattern 510_3 also has a length CW (i.e., a distance between the centers of the two outer surfaces of each filling pattern 510_3) greater than the lengths of the top surface UW and the bottom surface BW in the first direction d1. The shape of the protruding side surface 510s_3 of the filling pattern 510_3 may be formed during the process of attaching the first substrate 100 and the second substrate 300 together. However, it will be understood that the present disclosure is not limited thereto.

[0264] It will be understood that the light blocking member 320 of the second substrate 300 is not limited to Figure 4 In some embodiments, the light blocking member 320 may be made of one or more layers, and may further include an additional light blocking member disposed between the plurality of wavelength conversion patterns 341 and 343 and the light transmitting pattern 345 .

[0265] Fig. 22 According to another exemplary embodiment of the present disclosure Figure 3 A cross-sectional view of the display device taken along line IV-IV'.

[0266] Fig. 22 The display device 10_4 shown in FIG. Fig.14 The display device 10 shown in FIG. 1 is different in that the second substrate has a different structure. The planarization layer OC and the third cover layer PS3 may not be included in the second substrate 300_4, and the second substrate 300_4 may further include an auxiliary light blocking member 321_4 disposed in a space between the wavelength conversion patterns 341 and 343 and the light-transmitting pattern 345. The auxiliary light blocking member 321_4 may be disposed in a space between the wavelength conversion patterns 341 and 343 and the light-transmitting pattern 345 so that the space is filled with the auxiliary light blocking member 321_4.

[0267] Specifically, refer to Fig. 22, the display device 10_4 further includes a light blocking member 320_4 and an auxiliary light blocking member 321_4 disposed on the second substrate 310. The auxiliary light blocking member 321_4 is disposed on the second cover layer PS2 between the wavelength conversion patterns 341 and 343 and the light-transmitting pattern 345. The auxiliary light blocking member 321_4 may be located in the non-light emission area PB, but not in the first light emission area PA1, the second light emission area PA2, and the third light emission area PA3. For example, when viewed from the top, the auxiliary light blocking member 321_4 may be formed as a grid pattern, and color mixing that occurs when light crosses adjacent light emission areas PA1, PA2, and PA3 may be prevented or reduced. The thickness of the auxiliary light blocking member 321_4 may be, but is not limited to, greater than the thickness of each of the wavelength conversion patterns 341 and 343 and the light-transmitting pattern 345.

[0268] The auxiliary light blocking member 321_4 may absorb or reflect light of all colors and block or reduce transmission. When viewed from the top, the auxiliary light blocking member 321_4 may be formed in a grid pattern and may prevent or reduce color mixing that occurs when light crosses adjacent light emission areas PA1, PA2, and PA3.

[0269] The auxiliary light blocking member 321_4 may be disposed on the second cover layer PS2. The second cover layer PS2 may be made of a material including an inorganic material. However, in one or more exemplary embodiments, the second cover layer PS2 may include silicon oxynitride (SiON). When the second cover layer PS2 includes silicon oxynitride (SiON), the second cover layer PS2 may be more stably attached to the auxiliary light blocking member 321_4 and may be better (properly) extended. The auxiliary light blocking member 321_4 may be formed of the same material as the light blocking member 320_4, but this is merely illustrative.

[0270] In one or more exemplary embodiments, a cover layer may be further disposed on the auxiliary light blocking member 321_4. The cover layer may be completely disposed on the second substrate 300 to cover the auxiliary light blocking member 321_4 and the second cover layer PS2, but this is merely illustrative. The cover layer may cover only the auxiliary light blocking member 321_4.

[0271] like Fig. 22As shown in , when the second substrate 300_4 of the display device 10_4 does not include the planarization layer OC, it may be advantageous in that the thickness of the display device 10_4 may be reduced. An auxiliary light blocking member 321_4 that may block or reduce light may be disposed between the wavelength conversion patterns 341 and 343 and the light-transmitting pattern 345 instead of a planarization layer that may transmit light, so that the overall height of the second substrate 300_4 may be made uniform. In the display device 10_4 from which the planarization layer OC and the third cover layer PS3 have been removed, the top surface of the filling pattern 510_4 may be in direct contact with the wavelength conversion patterns 341 and 343 and the light-transmitting pattern 345 (specifically, the second cover layer PS2) of the second substrate 300.

[0272] In one or more embodiments, the auxiliary light blocking member 321_4 may block light emitted through the wavelength conversion patterns 341 and 343 and the side surfaces of the light-transmitting pattern 345 to more effectively prevent or reduce color mixing between the light emission areas PA1, PA2, and PA3.

[0273] The auxiliary light blocking member 321_4 may be disposed in a space between monomers of the filling pattern 510_4 of the filling layer 500. For example, a bottom surface of the auxiliary light blocking member 321_4 may be in contact with the filling material 520_4, and a portion of a side surface of the auxiliary light blocking member 321_4 may be in contact with the filling pattern 510_4. Since the auxiliary light blocking member 321_4 disposed between the wavelength conversion patterns 341 and 343 and the light-transmitting pattern 345 is partially in contact with the filling pattern 510_4, a portion of light incident on the second substrate 300 from the filling pattern 510_4 may be blocked or reduced.

[0274] For example, when a portion of light L emitted from the first organic light emitting element ED1 is not reflected at the boundary between the filling pattern 510_4 and the filling material 520_4 but is incident on the second wavelength conversion pattern 343, the auxiliary light blocking member 321_4 may block or reduce the light L. Figure 4 The display device 10 is different. Fig. 22 The display device 10_4 may include an auxiliary light blocking member 321_4 that may partially block or reduce light incident on the wavelength conversion patterns 341 and 343 and the light-transmitting pattern 345 to more effectively prevent or reduce color mixing.

[0275] As described above, the space between the cells of the filling pattern 510 of the filling layer 500 may be filled with the filling material 520. The cells of the filling pattern 510 may be arranged on the first substrate 100 in different suitable shapes at different suitable intervals. Hereinafter, the shape of the filling pattern 510 when viewed from the top will be described in more detail.

[0276] Figure 23 to Figure 25are schematic plan views of a first substrate and a filling pattern formed on the first substrate according to various exemplary embodiments.

[0277] Reference Fig.23 , each monomer of the filling pattern 510_5 of the display device 10_5 may be formed on the first substrate 100_5 in the corresponding pixels PX1, PX2, and PX3. The filling pattern 510_5 may include monomers that are adjacent to each other in the first direction d1 and spaced apart from each other in the second direction d2. For example, when viewed from the top, the filling pattern 510_5 may have a substantially rectangular shape and may be disposed on the first substrate 100 in an island shape or a grid pattern. However, it will be understood that the present disclosure is not limited thereto.

[0278] Each monomer of the filling pattern 510_5 may be included in the corresponding pixels PX1, PX2, and PX3 to cover the emission areas LA1, LA2, and LA3, and may be spaced apart from each other. For example, when viewed from the top, the area of ​​each monomer of the filling pattern 510_5 may be smaller than the area of ​​each of the pixels PX1, PX2, and PX3, but may be larger than the area of ​​each of the corresponding emission areas LA1, LA2, and LA3.

[0279] The filling material 520_5 may be disposed on the first substrate 100 between the cells of the filling pattern 510_5 that are separated from each other. As described above, when the height of the filling pattern 510_5 is equal to the thickness of the filling layer 500, the filling material 520_5 may also substantially form a pattern. Therefore, the filling material 520_5 may include a portion extending in the first direction d1 and a portion extending in the second direction d2 to surround the filling pattern 510_5. When viewed from the top, the filling material 520_5 may form a substantially grid pattern. Each cell of the filling pattern 510_5 may be individually disposed for a corresponding light emitting area PA. For example, when viewed from the top, the filling pattern 510_5 may have a substantially island shape or a dot shape.

[0280] Reference Fig.24 , each monomer of the filling pattern 510_6 of the display device 10_6 may extend in one direction (eg, in the second direction d2) to be connected to another monomer located in an adjacent pixel, and may be separated from another monomer in another direction (eg, in the first direction d1). Fig.23 The difference shown in Fig.24 The filling pattern 510_6 shown in FIG. 5 may have a line shape.

[0281] When there is no need to worry about the color mixing of light emitted from different pixels, for example, when the colors of light emitted from different pixels overlapped with each monomer of the filling pattern 510_6 are the same, the filling pattern 510_6 may have a shape extending in one direction. As shown in the drawings, when a plurality of pixels arranged in the second direction d2 emit light of the same color, there is no need to worry about color mixing. Therefore, a single monomer of the filling pattern 510_6 may be arranged across a plurality of pixels, and it is not necessary to block the path of light by the filling material 520_6 to prevent color mixing. Therefore, the monomer of the filling pattern 510_6 may extend in one direction to overlap with a plurality of pixels.

[0282] Reference Fig.25 , Fig.25 The filling pattern 510_7 of the display device 10_7 in Fig.23 The filling pattern 510_7 is different from the filling pattern 510_5 shown in FIG. 5 in that the filling pattern 510_7 has a circular or elliptical shape with a predetermined curvature when viewed from the top. In the following description, redundant description will not be provided.

[0283] For example, when the filling pattern 510_7 is formed through an inkjet process, the material of the filling pattern 510_7 has surface tension so that the outer surface may have a curvature. Fig.25 Although the filling pattern 510_7 has a circular or oval shape when viewed from the top, this is merely illustrative. The material of the filling pattern 510_7 is not particularly limited here as long as it can be formed via an inkjet process or another process and at least one surface thereof is formed as a curved surface.

[0284] In one or more embodiments, the filling pattern 510 composed of a single monomer may be provided to completely cover the encapsulation layer 170 of the first substrate 100. In other words, the filling pattern 510 may be implemented as a single piece, rather than monomers separated from each other. In one or more embodiments, as described above, the filling pattern 510 may include the same material as the material of the encapsulation layer 170. For example, when the encapsulation layer 170 and the filling pattern 510 include hexamethyldisiloxane (HMDSO), when the encapsulation layer 170 is formed on the common electrode CE of the first substrate 100, the filling pattern 510 may be formed via a continuous process. That is, the encapsulation layer 170 and the filling pattern 510 may be formed as a single layer at the same time.

[0285] Fig.26 and Fig. 27 According to other exemplary embodiments of the present disclosure Figure 3 A cross-sectional view of the display device taken along line IV-IV'.

[0286] Reference Fig.26, the filling pattern 510_8 according to the exemplary embodiment of the present disclosure may completely cover the encapsulation layer 170. Fig.14 The display device 10 is different, according to Fig.26 The filling pattern 510_8 in the display device 10_8 of the exemplary embodiment shown in FIG. 1 may be integrated into a single layer, rather than being patterned into a plurality of monomers of the filling pattern 510_8. Therefore, the filling layer 500 includes the filling pattern 510_8, but may not include the filling material 520. For example, the filling layer 500 may be filled only with the filling pattern 510_8.

[0287] In this case, the light L output from the first substrate 100 is scattered at the bent portion GP formed in the first pattern portion 510a_8 of the filling pattern 510_8. The scattered light L" may be incident on the second substrate 300 through the second pattern portion 510b_8. Compared with a display device in which the filling pattern 510 is not provided in the filling layer 500 and the filling layer 500 is only filled with the filling material 520, Fig.26 The light extraction efficiency of the display device 10_8 can be increased. In addition, if there is no need to worry about color mixing among the light emission areas PA1, PA2, and PA3, or if light of the same color is emitted from the light emission areas PA1, PA2, and PA3, a single monomer filling pattern 510_8 can be locally set as desired. In this case, the first substrate 100 and the second substrate 300 can be reliably attached together without the filling material 520, so that the light extraction efficiency can be improved.

[0288] Reference Fig. 27 , in the display device 10_9 according to an exemplary embodiment of the present disclosure, the second inorganic encapsulation layer 175 may not be included in the encapsulation layer 170 ′ of the first substrate 100 , and the filling pattern 510_9 may be directly formed on the organic encapsulation layer 173 .

[0289] As described above, when the organic encapsulation layer 173 of the encapsulation layer 170' and the filling pattern 510_9 include the same material (e.g., hexamethyldisiloxane (HMDSO)), the filling pattern 510_9 may be directly formed on the organic encapsulation layer 173 of the encapsulation layer 170'. The filling pattern 510_9 may be formed by extending substantially along the organic encapsulation layer 173. Fig. 27 Although shown as separated from each other, they can essentially be a single layer.

[0290] Therefore, during the process of manufacturing the display device 10_9, the filling pattern 510_9 may be formed through the process of manufacturing the first substrate 100, rather than being formed through a separate process after manufacturing the first substrate 100. That is, there is an advantage that the process of manufacturing the display device 10_9 may be simplified.

[0291] As used herein, the term "use" and variations thereof may be considered synonymous with the term "utilize" and variations thereof, respectively.

[0292] Additionally, the terms "substantially," "approximately," "about," and similar terms are used as terms of approximation rather than terms of degree, and are intended to account for the inherent variations in measurements or calculations that would be recognized by those having ordinary skill in the art.

[0293] In addition, any numerical range stated herein is intended to include all sub-ranges of the same numerical precision included in the stated range. For example, the range "1.0 to 10.0" is intended to include all sub-ranges between the stated minimum value 1.0 and the stated maximum value 10.0 (including the stated minimum value 1.0 and the stated maximum value 10.0), that is, having a minimum value equal to or greater than 1.0 and a maximum value equal to or less than 10.0, such as 2.4 to 7.6. Any maximum numerical limit stated herein is intended to include all lower numerical limits included therein, and any minimum numerical limit stated in this specification is intended to include all higher numerical limits included therein. Therefore, the applicant reserves the right to modify this specification (including claims) to explicitly state any sub-ranges included in the scope explicitly stated herein.

[0294] In summarizing the specific embodiments, those skilled in the art will appreciate that many changes and modifications may be made to the preferred embodiments without substantially departing from the principles of the present invention. Therefore, the preferred embodiments of the disclosed invention are used only in a general and descriptive sense, and not for the purpose of limitation.

Claims

1. A display device, comprising: A first substrate, comprising at least one light-emitting element, wherein the first substrate comprises an emission region and a non-emission region surrounding the emission region; a second substrate facing the first substrate, wherein light emitted from the at least one light emitting element is incident on the second substrate; and a filling layer, located between the first substrate and the second substrate, wherein the filling layer includes a filling pattern at least a portion of which overlaps with the emission area and a filling material not overlapping with the emission area, the filling pattern includes a first pattern portion located on the first substrate, the first pattern portion having a curved portion in at least a portion of the first pattern portion, and The filling pattern includes a material different from a material of the filling material.

2. The display device according to claim 1, wherein: At least a portion of the filling pattern overlaps the at least one light emitting element, and the light emitted from the at least one light emitting element is to be incident on the filling pattern.

3. The display device according to claim 2, wherein: At least a portion of the light incident on the filling pattern will be scattered at the bent portion of the first pattern part.

4. The display device according to claim 3, wherein: At least a portion of the light scattered at the bent portion will be incident on the second substrate.

5. The display device according to claim 4, wherein: The curved portion has at least one protruding portion and at least one concave portion, wherein the at least one protruding portion protrudes upward from a straight line extending from one end of the curved portion toward the opposite end of the curved portion, and the at least one concave portion protrudes downward from the straight line, and wherein the protruding portion is separated from an adjacent protruding portion by 0.5µm to 1.5µm.

6. The display device according to claim 2, wherein: The filling pattern further includes a second pattern portion located on the first pattern portion, and the second pattern portion includes a same material as that of the first pattern portion.

7. The display device according to claim 6, wherein: The first pattern portion and the second pattern portion include hexamethyldisiloxane.

8. The display device according to claim 7, wherein: The bent portion of the first pattern part is formed when the hexamethyldisiloxane reacts with nitrogen-containing molecules, and the bent portion includes the nitrogen.

9. The display device according to claim 8, wherein: A content of the nitrogen in the first pattern portion is greater than a content of the nitrogen in the second pattern portion.

10. The display device according to claim 6, wherein: A bottom surface of the first pattern portion of the filling pattern contacts at least a portion of the first substrate, and a top surface of the second pattern portion of the filling pattern contacts at least a portion of the second substrate.

11. The display device according to claim 10, wherein: The second pattern portion covers at least a portion of the bent portion, and the light emitted from the at least one light emitting element will be scattered at the bent portion and will be incident on the second pattern portion.

12. The display device according to claim 2, wherein: The filling pattern includes cells, and the cells of the filling pattern are spaced apart from each other, and wherein the filling material is located between the cells of the filling pattern.

13. The display device according to claim 12, wherein: A bottom surface of the filling pattern contacts the first substrate, and a top surface of the filling pattern contacts the second substrate, and wherein the filling material is located between the cells of the filling pattern.

14. The display device according to claim 13, wherein: At least a portion of the light incident on the filling pattern will be incident on an interface between a side surface of the filling pattern and the filling material, and wherein at least a portion of the light incident on the interface will be reflected toward the filling pattern.

15. The display device according to claim 12, wherein: A bottom surface of the filling pattern contacts the first substrate, and a top surface of the filling pattern is spaced apart from the second substrate, and wherein the filling material is located between the filling pattern and the second substrate and between the cells of the filling pattern.

16. The display device according to claim 12, wherein: The filling pattern includes a material having a higher refractive index than the filling material, and wherein a difference between the refractive index of the filling pattern and the refractive index of the filling material is greater than 0.

3.

17. The display device according to claim 16, wherein: A difference between the refractive index of the filling pattern and a refractive index of each of the first substrate and the second substrate is in a range of 0.01 to 0.

3.

18. A display device, comprising: A first substrate including a plurality of emission regions and a non-emission region surrounding the plurality of emission regions; at least one organic light emitting element located in each of a plurality of emission regions defined in the first substrate; a second substrate facing the first substrate, a plurality of light emission areas being defined in the second substrate; as well as a filling layer, located between the at least one organic light emitting element and the second substrate, the filling layer comprising a filling pattern and a filling material, the filling pattern being composed of monomers alternately arranged in one direction when viewed from the top, The filling pattern includes: a first pattern portion at least partially overlapping the plurality of light emitting areas and having a curved portion in at least a portion of the first pattern portion; and a second pattern portion located on the first pattern portion and covering the curved portion. wherein at least a portion of the filling pattern overlaps with the emission region, and the filling material does not overlap with the emission region, wherein the refractive index of the filling material is less than the refractive index of the filling pattern, and Wherein, the filling pattern and the filling material include insulating material.

19. The display device according to claim 18, wherein: Light emitted from the at least one organic light emitting element will be incident on the first pattern portion of the filling pattern, and the light incident on the first pattern portion will be scattered at the bent portion.

20. The display device according to claim 19, wherein: At least a portion of the light incident on the first pattern portion will be incident on an interface between a side surface of the filling pattern and the filling material, and wherein at least a portion of the light incident on the interface will be reflected toward the first pattern portion.

21. The display device according to claim 20, wherein: At least a portion of the light scattered at the bent portion will be incident on the second pattern portion.

22. The display device according to claim 21, wherein: At least a portion of the light incident on the second pattern portion will be incident on the interface between the side surface of the filling pattern and the filling material, and wherein at least a portion of the light incident on the interface will be reflected toward the first pattern portion or the second pattern portion.

23. The display device according to claim 18, further comprising an encapsulation layer located between the at least one organic light emitting element and the filling layer, wherein: The filling pattern is located on the encapsulation layer such that a bottom surface of the first pattern portion contacts the encapsulation layer and a top surface of the second pattern portion faces the second base.

24. The display device according to claim 23, wherein: The encapsulation layer includes the same material as that of the first and second pattern parts of the filling pattern.

25. The display device according to claim 23, wherein: A length of a bottom surface of the filling pattern measured in a direction parallel to the first base is equal to a length of a top surface of the filling pattern measured in the direction.

26. The display device according to claim 23, wherein: When viewed from the top, an area of ​​a bottom surface of the filling pattern is greater than an area of ​​a top surface of the filling pattern, and wherein a side surface of the filling pattern is inclined such that the side surface forms an acute angle with the encapsulation layer.

27. The display device according to claim 23, wherein: When viewed from the top, an area of ​​a bottom surface of the filling pattern is smaller than an area of ​​a top surface of the filling pattern, and wherein a side surface of the filling pattern is inclined such that the side surface forms an obtuse angle with the encapsulation layer.

28. The display device according to claim 18, wherein: The filling pattern includes: a first unit of the filling pattern; and a second unit of the filling pattern spaced apart from the first unit in a first direction parallel to the first substrate, and wherein the filling material is located between the first unit and the second unit of the filling pattern.

29. The display device according to claim 28, wherein: The at least one organic light-emitting element includes: a first organic light-emitting element; and a second organic light-emitting element separated from the first organic light-emitting element, and wherein the multiple emission regions include a first emission region overlapping the first organic light-emitting element and a second emission region overlapping the second organic light-emitting element.

30. The display device according to claim 29, wherein: The display device also includes: a first wavelength conversion pattern located between the second substrate and the first organic light-emitting element; and a second wavelength conversion pattern located between the second substrate and the second organic light-emitting element, and wherein the plurality of light emission areas include: a first light emission area overlapping with the first wavelength conversion pattern; and a second light emission area overlapping with the second wavelength conversion pattern.

31. The display device according to claim 30, wherein: Light emitted from the first emission area will be incident on the first monomer of the filling pattern, and at least a portion of the incident light will be scattered at the bent portion to be incident on the first wavelength conversion pattern.

32. The display device according to claim 31, wherein: At least a portion of the light incident on the first monomer of the filling pattern will be incident on an interface between a side surface of the first monomer of the filling pattern and the filling material, and wherein at least a portion of the light incident on the interface will be reflected toward the first monomer of the filling pattern to be incident on the first wavelength conversion pattern.

33. The display device according to claim 32, wherein: An area of ​​a bottom surface of the first cell of the filling pattern is greater than an area of ​​the first emission region, and an area of ​​a top surface of the first cell of the filling pattern is equal to an area of ​​the first light exit region.

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