Display device

Abstract

A display device of an embodiment may include a substrate, a color filter layer, a color control layer, and an optical auxiliary layer disposed between the substrate and the color filter layer. The optical auxiliary layer may include a base portion and a plurality of recessed portions defined in the base portion, and an average refractive index of the optical auxiliary layer is greater than an average refractive index of the substrate and less than an average refractive index of the color filter layer. Thus, a display device of an embodiment including the optical auxiliary layer may exhibit a characteristic of improved reflectivity due to a difference in refractive index between the substrate and the color filter layer.

Description

Technical Field

[0001] The present invention relates to a display device and a method for manufacturing the same, and more particularly, to a display device including an optical auxiliary layer and a method for manufacturing the same. Background Art

[0002] Various electronic devices are being developed for providing image information in multimedia devices such as televisions, mobile phones, tablet computers, navigation systems, game consoles, etc. In particular, quantum dots and the like are being introduced in electronic devices including liquid crystal display elements, organic electroluminescent display elements, etc., in order to improve display quality.

[0003] In order to make such electronic devices exhibit good efficiency and improved reflectivity characteristics, reflectivity improvement methods are being studied. Summary of the invention

[0004] An object of the present invention is to provide a display device including an optical auxiliary layer capable of improving reflectivity.

[0005] Another object of the present invention is to provide a method for manufacturing a display device including an optical auxiliary layer capable of improving reflectivity.

[0006] One embodiment provides a display device, comprising: a substrate; a color filter layer, arranged on the lower side of the substrate; a color control layer, arranged on the lower side of the color filter layer; an optical auxiliary layer, arranged between the substrate and the color filter layer, and comprising a base portion and a plurality of recessed portions defined at the base portion and recessed in a direction toward the substrate, wherein an average refractive index of the optical auxiliary layer is higher than an average refractive index of the substrate and lower than an average refractive index of the color filter layer.

[0007] It may be that each of the recessed portions includes: an outer contour portion; and a core portion defined by the outer contour portion and filled with the color filter layer.

[0008] Each of the cores may include at least one of the pigment and the dye included in the color filter layer.

[0009] Each of the depressed portions may be hemispherical in shape, and an average diameter of each of the depressed portions may be greater than or equal to 200 nm and less than or equal to 500 nm.

[0010] The recessed portions may be derived from at least one of hollow silica particles, a hollow polymer, and a porogen.

[0011] It may be that the color filter layer includes: a first color filter portion, which allows the first light to pass; a second color filter portion, which allows the second light different from the first light to pass; a third color filter portion, which allows the third light different from the first light and the second light to pass; and a shading portion, which is arranged between the first color filter portion and the second color filter portion and between the second color filter portion and the third color filter portion, and each of the recessed portions includes a substance that is the same as at least one of the first color filter portion, the second color filter portion, the third color filter portion and the shading portion.

[0012] It may be that the optical auxiliary layer includes a plurality of sub-optical auxiliary layers, and each of the sub-optical auxiliary layers includes the base portion and the recessed portion.

[0013] The base portion may include at least one of acrylic resin, epoxy resin and Cardo resin.

[0014] The difference between the average refractive index of the base portion and the average refractive index of the substrate may be greater than 0 and less than 0.2.

[0015] The average refractive index of the substrate may be greater than or equal to 1.4 and less than or equal to 1.5, and the average refractive index of the base portion may be greater than or equal to 1.4 and less than or equal to 1.6.

[0016] The optical auxiliary layer may have a thickness of not less than 500 nm and not more than 2000 nm.

[0017] One embodiment provides a method for manufacturing a display device, comprising: providing a resin layer including a base resin and a plurality of nanoparticles dispersed in the base resin on a substrate; forming a preliminary optical auxiliary layer including a plurality of recessed portions formed by etching the resin layer to remove a portion of the plurality of nanoparticles; providing a color filter layer material on the preliminary optical auxiliary layer to form a color filter layer; and forming a color control layer including a plurality of quantum dots on the color filter layer, the step of forming the color filter layer including filling the recessed portions with the color filter layer material to form an optical auxiliary layer.

[0018] The average refractive index of the optical auxiliary layer may be higher than the average refractive index of the substrate and lower than the average refractive index of the color filter layer.

[0019] Each of the nanoparticles may be at least one of a hollow silica particle, a hollow polymer, and a porogen.

[0020] Each of the nanoparticles may be a porogen, and the total weight of the base resin and the porogen may include 50 wt % or more and 90 wt % or less of the porogen.

[0021] Each of the nanoparticles may be in the shape of a sphere, and an average diameter of each of the nanoparticles may be greater than or equal to 200 nm and less than or equal to 500 nm.

[0022] It may be that the preliminary optical auxiliary layer includes a plurality of preliminary sub-optical auxiliary layers, and each of the preliminary sub-optical auxiliary layers includes the base resin and the recessed portion.

[0023] It may be that the base resin includes at least one of acrylic resin, epoxy resin and cardo resin.

[0024] The difference between the refractive index of the base resin and the refractive index of the substrate may be greater than 0 and less than 0.2.

[0025] The refractive index of the substrate may be greater than or equal to 1.4 and less than or equal to 1.5, and the refractive index of the base resin may be greater than or equal to 1.4 and less than or equal to 1.6.

[0026] (Effects of the Invention)

[0027] A display device of an embodiment may include an optical auxiliary layer to exhibit improved reflectivity.

[0028] A method of manufacturing a display device according to an embodiment may include the step of forming an optical auxiliary layer, thereby providing a display device exhibiting improved reflectivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a perspective view showing a display device according to an embodiment.

[0030] Figure 2 is a schematic representation of Figure 1 I-I' corresponds to a cross-sectional view of the portion.

[0031] Figure 3 is the magnified representation and Figure 2 The AA area corresponds to the cross-sectional view of the portion.

[0032] Figure 4 is the magnified representation and Figure 2 The AA area corresponds to the cross-sectional view of the portion.

[0033] Figure 5 is the magnified representation and Figure 2 The AA area corresponds to the cross-sectional view of the portion.

[0034] Figure 6 It is a flowchart schematically showing a method for manufacturing a display device according to an embodiment.

[0035] Figure 7It is a diagram schematically showing a method for manufacturing a display device according to an embodiment.

[0036] Figure 8 It is a diagram schematically showing a method for manufacturing a display device according to an embodiment.

[0037] Explanation of symbols:

[0038] BS2, BS: substrate; OAL: optical auxiliary layer; BP: base part; OP: recessed part; UOP: outer contour part; COP: core part; CF: color filter layer; CL: color control layer. DETAILED DESCRIPTION

[0039] The present invention may have various changes and various forms, and specific embodiments are illustrated in the drawings and described in detail herein. However, this is not intended to limit the present invention to a specific disclosed form, and should be understood to include all changes, equivalents and substitutes included in the thought and technical scope of the present invention.

[0040] In this specification, when a certain component (or region, layer, part, etc.) is mentioned as being located on, connected to or combined with other components, it means that it can be directly configured / connected / combined on the other components, or a third component can be configured in between.

[0041] The same symbols refer to the same components. In addition, in each of the drawings, the thickness, ratio, and size of each component are exaggerated for the effective description of the technical content.

[0042] "And / or" includes all possible combinations of more than one of the related components.

[0043] The terms first, second, etc. may be used to describe various constituent elements, but the constituent elements shall not be limited to the terms. The terms are used only for the purpose of distinguishing one constituent element from other constituent elements. For example, without exceeding the scope of the present invention, the first constituent element may be named as the second constituent element, and similarly, the second constituent element may be named as the first constituent element. The expression of the singular includes the expression of the plurality when there is no clear contrary meaning in the text.

[0044] In addition, the terms such as “below”, “on the lower side”, “above”, and “on the upper side” are used to explain the connection relationship between the components shown in the drawings. The above terms are relative concepts and are explained based on the directions shown in the drawings.

[0045] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this specification have the same meaning as those generally understood by those skilled in the art. In addition, such terms as defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant technology, and should not be interpreted as an idealized or overly formal meaning unless clearly defined in this application.

[0046] Terms such as “including” or “having” should be understood to refer to the existence of features, numbers, steps, operations, constituent elements, parts or combinations thereof recorded in the specification, and do not exclude in advance the existence or additional possibility of one or more other features, numbers, steps, operations, constituent elements, parts or combinations thereof.

[0047] Hereinafter, a display device and a method for manufacturing the display device according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0048] Figure 1 A display device DD according to an embodiment is shown. Figure 2 Representation and Figure 1 The portion corresponding to the line II' is a cross-sectional view of the display device DD according to an embodiment. Figure 3 It means Figure 2 The AA area corresponds to the cross-sectional view of the portion. Figure 4 and Figure 5 Representation and Figure 2 The parts corresponding to the AA area are figures representing other embodiments of the present invention.

[0049] exist Figure 1 In the embodiment, a portable electronic device is exemplified as the display device DD. However, the display device DD may be used in large electronic devices such as televisions, monitors, or external advertising boards, and may also be used in small and medium-sized electronic devices such as personal computers, notebook computers, personal digital terminals, car navigation units, game consoles, smart phones, tablets, and cameras. In addition, these are provided only as embodiments, and may also be used in other electronic devices as long as they do not exceed the concept of the present invention.

[0050] Reference Figure 1 The display device DD can display an image IM through a display surface IS. The display surface IS includes a display area DA that displays the image IM and a non-display area NDA adjacent to the display area DA. The non-display area NDA is an area where no image is displayed.

[0051] The display area DA may be a quadrilateral. The non-display area NDA may surround the display area DA. However, this is not limited thereto, and the shape of the display area DA and the shape of the non-display area NDA may be designed relatively. In addition, the non-display area NDA may not exist on the entire surface of the display device DD.

[0052] A display device DD according to an embodiment may include a substrate BS2, a color filter layer CF disposed under the substrate BS2, a color control layer CL disposed under the color filter layer CF, and an optical auxiliary layer OAL disposed between the substrate BS2 and the color filter layer CF.

[0053] The optical auxiliary layer OAL may include a base portion BP and a plurality of recessed portions OP defined in the base portion BP. A portion in the base portion BP that is not filled with a substance forming the base portion BP but with a substance forming the color filter layer CF may be defined as the recessed portion OP. The color filter layer CF may be formed by including a pigment or a dye, and thus each recessed portion OP defined in the base portion BP may include a pigment or a dye forming the color filter layer CF.

[0054] Each of the plurality of recessed portions OP may have a shape that is recessed toward the substrate BS2 , and a recessed surface of each recessed portion OP may be adjacent to the substrate BS2 .

[0055] According to one embodiment, the average refractive index of the optical auxiliary layer OAL may be higher than the average refractive index of the substrate BS2 and lower than the average refractive index of the color filter layer CF. The refractive index of a region included in the optical auxiliary layer OAL may be a value similar to the average refractive index of the substrate BS2. A region of the optical auxiliary layer OAL may be a predetermined region included in the optical auxiliary layer OAL. That is, a region of the optical auxiliary layer OAL may be a partial region included in the optical auxiliary layer OAL.

[0056] The refractive index of a region included in the optical auxiliary layer OAL may be a value similar to the average refractive index of the color filter layer CF. Thus, the average refractive index of the optical auxiliary layer OAL may be a value between the average refractive index of the substrate BS2 and the average refractive index of the color filter layer CF. Figures 3 to 5 The details are described in the description.

[0057] Figure 2 Representation and Figure 1 The portion corresponding to the line II' is a cross-sectional view of the display device DD according to an embodiment.

[0058] The display device DD may include a base substrate BS1, a circuit layer DP-CL disposed on the base substrate BS1, a light emitting element layer LED disposed on the circuit layer DP-CL, and an encapsulation layer TFE disposed on the light emitting element layer LED.

[0059] The base substrate BS1 may be a polymer substrate, a plastic substrate, a glass substrate, a quartz substrate, etc. The base substrate BS1 may be a transparent insulating substrate. The base substrate BS1 may be a rigid substrate. The base substrate BS1 may be a flexible substrate.

[0060] The light-emitting element layer LED may include a first light-emitting element LED-1, a second light-emitting element LED-2, and a third light-emitting element LED-3, respectively. The first light-emitting element LED-1, the second light-emitting element LED-2, and the third light-emitting element LED-3 may include first electrodes EL1-1, EL1-2, EL1-3, hole transport regions HTR, light-emitting layers EML, electron transport regions ETR, and second electrodes EL2 stacked in sequence, respectively. The light-emitting layer EML may generate blue light. The light-emitting element layer LED may emit blue light, and the light-emitting layer EML may generate light in a wavelength region of 410nm to 480nm. On the other hand, although not shown in the figure, each light-emitting element may include a plurality of light-emitting layers. A plurality of light-emitting layers may be provided by stacking in sequence, and a light-emitting element including a plurality of light-emitting layers may emit white light. The light-emitting element including a plurality of light-emitting layers may be a light-emitting element of a tandem structure.

[0061] A pixel definition film PDL may be defined in the light emitting element layer LED. For example, the pixel definition film PDL may be formed by including a polyacrylate resin or a polyimide resin. Differently, the pixel definition film PDL may be formed by an inorganic substance. For example, the pixel definition film PDL may be formed by including silicon nitride, silicon oxide, silicon oxynitride, etc. In the light emitting element layer LED, the pixel definition film PDL may be used to divide the light emitting elements LED-1, LED-2, and LED-3.

[0062] The encapsulation layer TFE can be arranged on the light emitting element layer LED to seal the light emitting element layer LED. The encapsulation layer TFE can protect the light emitting element layer LED from moisture / oxygen and can protect the light emitting element layer LED from foreign matter such as dust particles. Figure 2 2 shows a case where the encapsulation layer TFE includes one organic layer OL and one inorganic layer IL, but the embodiment is not limited thereto, and the encapsulation layer may have a structure in which organic layers and inorganic layers are alternately and repeatedly stacked.

[0063] The aforementioned color control layer CL, color filter layer CF, optical auxiliary layer OAL and substrate BS2 may be disposed on the encapsulation layer TFE. An overcoat layer OC may be disposed between the encapsulation layer TFE and the color control layer CL. The overcoat layer OC may be a planarization layer or a buffer layer.

[0064] The color control layer CL may include a plurality of quantum dots QD-G, QD-R and scattering particles (not shown). The scattering particles may include TiO 2 Or nanoparticles of silicon dioxide, etc. The scattering particles can scatter the light provided by the light-emitting element layer LED or the light emitted from each quantum dot QD-G, QD-R. Each quantum dot QD-G, QD-R can change the wavelength of the light emitted from the light-emitting element layer LED.

[0065] Each quantum dot QD-G, QD-R can be a semiconductor nanocrystal that can be selected from II-VI group compounds, III-VI group compounds, III-V group compounds, IV-VI group compounds, IV group elements, IV group compounds, I-III-VI group compounds and combinations thereof.

[0066] The II-VI compound may be selected from the group consisting of binary compounds, ternary compounds and quaternary compounds, wherein the binary compound is selected from the group consisting of CdSe, CdTe, CdS, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS and mixtures thereof, and the ternary compound is selected from the group consisting of CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, The quaternary compound is selected from the group consisting of CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS and a mixture thereof, and the quaternary compound is selected from the group consisting of HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe and a mixture thereof.

[0067] The III-VI compounds may include, for example, In 2 S 3 、In 2 Se 3 Binary compounds such as InGaS 3 、InGaSe 3 or any combination thereof.

[0068] The I-III-VI group compound can be selected from AgInS 2 、CuInS 2 、AgGaS 2 、CuGaS 2 and a ternary compound selected from the group consisting of a mixture thereof, or AgInGaS 2 、CuInGaS 2 etc. quaternary compounds.

[0069] The III-V compounds may be selected from the group consisting of binary compounds, ternary compounds and quaternary compounds, wherein the binary compound is selected from the group consisting of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb and mixtures thereof, the ternary compound is selected from the group consisting of GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InGaP, InAlP, InNP, InNAs, InNSb, InPAs, InPSb and mixtures thereof, and the quaternary compound is selected from the group consisting of GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb and mixtures thereof. On the other hand, the III-V compound may further include a II-group metal. For example, InZnP or the like may be selected as the III-II-V compound.

[0070] The IV-VI compound may be selected from the group consisting of binary compounds, ternary compounds and quaternary compounds, wherein the binary compound is selected from the group consisting of SnS, SnSe, SnTe, PbS, PbSe, PbTe and mixtures thereof, the ternary compound is selected from the group consisting of SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe and mixtures thereof, and the quaternary compound is selected from the group consisting of SnPbSSe, SnPbSeTe, SnPbSTe and mixtures thereof. As the IV group element, it may be selected from the group consisting of Si, Ge and mixtures thereof. As the IV group compound, it may be a binary compound selected from the group consisting of SiC, SiGe and mixtures thereof.

[0071] At this time, the binary compound, ternary compound or quaternary compound can be present in the particle at a uniform concentration, or can be present in the same particle in a state where the concentration distribution is partially different. In addition, there can also be a core-shell structure in which one quantum dot surrounds other quantum dots. The interface between the core and the shell can have a concentration gradient in which the concentration of the element present in the shell decreases toward the center.

[0072] Examples of the core of each quantum dot QD-G, QD-R include metal or non-metal oxides, semiconductor compounds, or combinations thereof.

[0073] For example, metal or non-metal oxides include 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 , NiO and other binary compounds, or MgAl 2 O 4 、CoFe 2 O 4 、NiFe 2 O 4 、CoMn 2 O 4 etc., but the present invention is not limited thereto.

[0074] As semiconductor compounds, CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnSeS, ZnTeS, GaAs, GaP, GaSb, HgS, HgSe, HgTe, InAs, InP, InGaP, InSb, AlAs, AlP, AlSb, etc. can be exemplified, but the present invention is not limited thereto.

[0075] A functional layer ENL may be disposed between the color control layer CL and the color filter layer CF. The functional layer ENL may be disposed between the color control layer CL and the color filter layer CF so that a portion of light emitted from the color control layer CL toward the color filter layer CF is incident on the color control layer CL again. By recycling the light, the light efficiency of the display device DD may be improved.

[0076] The color filter layer CF may include first to third color filter portions CF-1 to CF-3 and a light shielding portion BM. The first to third color filter portions CF-1 to CF-3 may be configured to be spaced apart on a plane, and the light shielding portion BM may be configured between each of the color filter portions CF-1, CF-2, and CF-3.

[0077] The first color filter section CF-1 may be configured corresponding to the first color control section CL-1, and may allow the first light to pass through. The second color filter section CF-2 may be configured corresponding to the second color control section CL-2, and may allow the second light different from the first light to pass through. The third color filter section CF-3 may be configured corresponding to the third color control section CL-3, and may allow the third light different from the first light and the second light to pass through. For example, the first light may be green light, the second light may be blue light, and the third light may be red light. The first color filter section CF-1 may allow the green light to pass through, and block the blue light and the red light. The second color filter section CF-2 may allow the blue light to pass through, and block the green light and the red light. The third color filter section CF-3 may allow the red light to pass through, and block the green light and the blue light.

[0078] The light-shielding portion BM may include a first light-shielding pattern BM1 and a second light-shielding pattern BM2. The light-shielding portion BM may be formed by an organic light-shielding substance or an inorganic light-shielding substance containing a black pigment or dye. The light-shielding portion BM may be formed by an organic light-shielding substance or an inorganic light-shielding substance containing a blue pigment or dye. For example, the first light-shielding pattern BM1 may be formed of a light-shielding substance including a black pigment or dye, and the second light-shielding pattern BM2 may be formed of a light-shielding substance including a blue pigment or dye. The second light-shielding pattern BM2 may include the same substance as the second color filter portion CF-2 configured at the lower side of the second light-shielding pattern BM2. However, the embodiment is not limited thereto, and the second light-shielding pattern BM2 may also be omitted.

[0079] The substrate BS2 may be a polymer substrate, a plastic substrate, a glass substrate, a quartz substrate, etc. The substrate BS2 may be a transparent insulating substrate. The substrate BS2 may be a rigid substrate. The substrate BS2 may be a flexible substrate.

[0080] A protection film PF may be disposed on the substrate BS2 . The protection film PF may protect the display surface IS of the display device DD and alleviate the reflection phenomenon caused by the difference in refractive index between the substrate BS2 and air.

[0081] According to one embodiment, an optical auxiliary layer OAL may be disposed between the color filter layer CF and the substrate BS2 .

[0082] The optical auxiliary layer OAL may include a base portion BP and a plurality of recessed portions OP defined in the base portion BP. Each recessed portion OP may have a shape that is recessed toward the substrate BS2. The curved surface of each recessed portion OP may be adjacent to the substrate BS2. Each recessed portion OP may include an outer contour portion UOP and a core portion COP. The outer contour portion UOP of each recessed portion OP may be adjacent to the substrate BS2.

[0083] The outer shell UOP of each recessed portion OP may include a polymer substance. For example, the outer shell UOP may include polystyrene. However, this is an example, and the embodiment is not limited thereto.

[0084] The core COP of each recessed portion OP can be defined by the outer contour portion UOP, and the core COP can be filled with a substance that forms the color filter layer CF. The core COP can be filled with the same substance as the substance included in the color filter layer CF. The core COP can be filled with the same substance as at least one of the pigments and dyes included in the color filter layer CF. The core COP can be filled with the same substance as at least one of the first color filter portion CF-1, the second color filter portion CF-2, the third color filter portion CF-3 and the shading portion BM included in the color filter layer CF. The core COP can be filled with the same substance as at least one of the first color filter portion CF-1 to the third color filter portion CF-3 and the shading portion BM configured adjacent to the core COP.

[0085] Figures 3 to 5 The core COP may include the same substance as the first color filter section CF-1 configured adjacent to the core COP. The core COP may include the same substance as the pigment or dye forming the first color filter section CF-1. For example, in the case where the first color filter section CF-1 allows green light to pass through, the core COP may include a green pigment or dye. However, the embodiment is not limited thereto, and the core COP may also be filled with the same substance as at least one of the second color filter section CF-2, the third color filter section CF-3, and the light shielding section BM.

[0086] exist Figures 3 to 5 , each recessed portion OP is shown to be a hemispherical shape composed of a circular curved surface and a flat surface, but this is an example, and each recessed portion may be a shape in which only a portion of the edge position of the spherical surface of the ball is removed. In other words, each recessed portion may be a shape in which a portion less than half of the entire spherical surface is removed from the spherical surface of the ball.

[0087] exist Figure 3 The average diameter R of each depression OP is shown in FIG. 0 According to one embodiment, the average diameter R of each recessed portion OP is 0The average diameter R of each depression OP may be greater than 200 nm and less than 500 nm. 0 The average diameter R may be greater than 200 nm and less than 400 nm. The diameters of the respective depressions OP may be different from each other. The diameters of the respective non-spherical depressions OP may be measured by assuming the shape of a sphere having the same volume. In this specification, the average diameter R 0 It may be the arithmetic mean of the diameters of the respective nanoparticles expressed for a plurality of nanoparticles, or it may be the mean of the diameters expressed for a single nanoparticle having a non-spherical shape.

[0088] Each recessed portion OP may be derived from at least one of hollow silica particles, a high molecule including a hollow and a porogen. For example, each recessed portion OP may be derived from a hollow silica particle. The outer contour UOP of each recessed portion OP may be derived from the shell of the hollow silica particle, and the core COP of each recessed portion OP may be derived from the core of the hollow silica particle. Alternatively, the outer contour UOP of each recessed portion OP may be derived from a high molecule including a hollow, and the core COP of each recessed portion OP may be derived from a hollow surrounded by a high molecule of an outer contour defining a high molecule including a hollow.

[0089] The base BP of the optical auxiliary layer OAL may include at least one of an acrylic resin, an epoxy resin, and a cardo resin. The difference between the average refractive index of the base BP and the average refractive index of the substrate BS2 may be greater than 0 and less than 0.2. The difference between the average refractive index of the base BP and the average refractive index of the substrate BS2 may be less than 0.1. The refractive index of the base BP and the refractive index of the substrate BS2 may be the same. The average refractive index of the substrate BS2 may be greater than 1.4 and less than 1.5. The average refractive index of the base BP may be greater than 1.4 and less than 1.6. For example, the refractive index of the substrate BS2 may be 1.45, and the refractive index of the base BP may be 1.55. The refractive index of the substrate BS2 may be 1.45, and the refractive index of the base BP may be 1.58. The refractive index of the substrate BS2 may be 1.45, and the refractive index of the base BP may be 1.53. However, this is an example, and the embodiment is not limited thereto.

[0090] The average refractive index of the optical auxiliary layer OAL including the base portion BP and the plurality of recessed portions OP may be higher than the average refractive index of the substrate BS2 and lower than the average refractive index of the color filter layer CF. The average refractive index of the optical auxiliary layer OAL may have a value between the average refractive index of the substrate BS2 and the average refractive index of the color filter layer CF. The refractive index of the optical auxiliary layer OAL disposed between the substrate BS2 and the color filter layer CF may exhibit a value similar to the refractive index of the substrate BS2 in an area close to the substrate BS2, and exhibit a value similar to the refractive index of the color filter layer CF in an area close to the color filter layer CF. As described above, the refractive index of the base portion BP may have a value similar to the refractive index of the substrate BS2. Thus, the average refractive index of the optical auxiliary layer OAL may be higher than the average refractive index of the substrate BS2 and lower than the average refractive index of the color filter layer CF.

[0091] According to one embodiment, the thickness T of the optical auxiliary layer OAL is 0 For example, the thickness T of the optical auxiliary layer OAL may be greater than 500 nm and less than 2000 nm. 0 The average diameter R of each recessed portion OP may be 0 On the other hand, when the optical auxiliary layers OAL-a and OAL-b include a plurality of sub-optical auxiliary layers SOAL, the thickness of the optical auxiliary layers OAL-a and OAL-b may have a value approximately equal to the average diameter R of each recessed portion OP. 0 However, this is an example, and the embodiment is not limited thereto.

[0092] exist Figure 4 and Figure 5 In, different from Figure 3 , shows a case where the optical auxiliary layers OAL-a and OAL-b include multiple sub-optical auxiliary layers SOAL. The optical auxiliary layers OAL-a and OAL-b of one embodiment may include multiple sub-optical auxiliary layers SOAL. Each sub-optical auxiliary layer SOAL may include a base portion BP and multiple recessed portions OP defined in the base portion BP. The base portion BP and the recessed portions OP included in each sub-optical auxiliary layer SOAL may be formed of the same material as the material forming the base portion BP and the recessed portions OP included in the optical auxiliary layer OAL.

[0093] exist Figure 4 In each sub-optical auxiliary layer SOAL, the average diameter of the plurality of recessed portions OP defined in the base portion BP may be smaller than that in Figure 3 The average diameter R of the plurality of depressions OP defined in the base portion BP in the optical auxiliary layer OAL can be considered as 0The optical auxiliary layers OAL, OAL-a, and OAL-b are formed into a single layer or multiple layers. When the average diameter of each recessed portion OP is relatively small, the optical auxiliary layers OAL-a and OAL-b may be formed of multiple layers including a plurality of sub-optical auxiliary layers SOAL. When the average diameter of each recessed portion OP is relatively large, the optical auxiliary layer OAL may be formed of a single layer.

[0094] exist Figure 3 and Figure 4 FIG. 4 shows a case where the depressions OP are regularly arranged adjacent to each other. Figure 3 and Figure 4 FIG. 4 shows a case where the recessed portions OP are arranged side by side in the direction in which the first direction axis DR1 extends. Figure 5 , the case where the recessed portions OP are arranged at intervals is shown. For example, the recessed portions OP defined in the base portion BP may be arranged irregularly. That is, on the cross section of the optical auxiliary layer OAL-b, the number of recessed portions OP included in the same area may be different.

[0095] On the other hand, Figures 3 to 5 In the optical auxiliary layers OAL, OAL-a, and OAL-b, a plurality of recessed portions OP defined in the base portion BP are spaced apart from the substrate BS2 at a certain interval in the direction in which the third axial axis DR3 extends. However, the embodiment is not limited thereto, and the plurality of recessed portions may not be spaced apart from the substrate but may be adjacent to the substrate.

[0096] The optical auxiliary layer OAL, OAL-a, OAL-b of one embodiment may include a base portion BP and a plurality of recessed portions OP defined in the base portion BP. The average refractive index of the optical auxiliary layer OAL, OAL-a, OAL-b may be above the average refractive index of the substrate BS2 and below the average refractive index of the color filter layer CF. The optical auxiliary layer OAL, OAL-a, OAL-b disposed between the substrate BS2 and the color filter layer CF may reduce the reflectivity of the display device DD caused by the difference between the refractive index of the substrate BS2 and the refractive index of the color filter layer CF. The optical auxiliary layer OAL, OAL-a, OAL-b may be disposed between the substrate BS2 and the color filter layer CF adjacent to the substrate BS2, thereby alleviating the difference in refractive index between the substrate BS2 and the color filter layer CF. The average refractive index of the optical auxiliary layers OAL, OAL-a, OAL-b may be higher than the average refractive index of the substrate BS2 and lower than the average refractive index of the color filter layer CF, and the optical auxiliary layers OAL, OAL-a, OAL-b may mitigate the difference in refractive index between the substrate BS2 and the color filter layer CF. Thus, the display device DD including the optical auxiliary layers OAL, OAL-a, OAL-b of one embodiment may exhibit a characteristic of improved reflectivity caused by specular reflection (specular component) between the substrate BS2 and the color filter layer CF.

[0097] Hereinafter, a method for manufacturing a display device DD according to an embodiment including a step of forming an optical auxiliary layer OAL according to an embodiment will be described. The same reference numerals are used for the components described above, and their description will be omitted.

[0098] Figure 6 1 is a flowchart schematically showing a method for manufacturing a display device DD according to an embodiment. Figure 7 and Figure 8 The following are diagrams schematically showing steps of a method for manufacturing a display device DD according to an embodiment.

[0099] The manufacturing method of the display device DD of one embodiment may include: step S100 of providing a resin layer BOP on a substrate BS; step S200 of forming a preliminary optical auxiliary layer OAL-P; step S300 of forming an optical auxiliary layer OAL and a color filter layer CF; and step S400 of forming a color control layer CL.

[0100] exist Figure 7 FIG. 4 shows a step S100 of providing a resin layer BOP on a substrate BS. The substrate BS may be the same as the substrate BS2 ( Figure 2) are the same. The resin layer BOP provided on the substrate BS may include a base resin BP-P and a plurality of nanoparticles OP-P dispersed in the base resin BP-P. The base resin BP-P may include at least one of an acrylic resin, an epoxy resin and a cardo resin. The difference between the refractive index of the base resin BP-P and the refractive index of the substrate BS may be greater than 0 and less than 0.2. The difference between the refractive index of the base resin BP-P and the refractive index of the substrate BS may be less than 0.1. The refractive index of the base resin BP-P and the refractive index of the substrate BS may be the same. The refractive index of the base resin BP-P may be greater than the refractive index of the substrate BS. The refractive index of the base resin BP-P may be greater than 1.4 and less than 1.6. The refractive index of the substrate BS may be greater than 1.4 and less than 1.5. The above-mentioned base portion BP ( Figure 3 etc.) can be formed from base resin BP-P.

[0101] According to one embodiment, in step S200 of forming the preliminary optical auxiliary layer OAL-P, the resin layer BOP may be etched to remove a portion of the plurality of nanoparticles OP-P. Each of the nanoparticles OP-P may have a spherical shape. The average diameter of each of the nanoparticles OP-P may be greater than 200 nm and less than 500 nm. The average diameter of each of the nanoparticles OP-P may be greater than 200 nm and less than 400 nm. Figure 7 and Figure 8 , the size of each nanoparticle OP-P is the same, but the embodiment is not limited thereto, and the size of each nanoparticle OP-P may be different. That is, the diameter of each nanoparticle OP-P may be different. In addition, each nanoparticle may have an elliptical shape instead of a spherical shape.

[0102] Each nanoparticle OP-P may be at least one of a hollow silica particle, a hollow polymer, and a porogen. For example, each nanoparticle OP-P may be a porogen. In the case where each nanoparticle OP-P is a porogen, the total weight of the base resin BP-P and each nanoparticle OP-P may include 50% by weight or more and 90% by weight or less of the nanoparticle OP-P. That is, the total weight of the base resin BP-P and the porogen may include 50% by weight or more and 90% by weight of the porogen.

[0103] On the other hand, each nanoparticle OP-P may have a core-shell structure including a core and a shell surrounding the core. Figure 3 etc.) can be derived from the shell of each nanoparticle OP-P, the core COP of each recessed part OP ( Figure 3The recessed portion OP may be formed by etching the nanoparticles OP-P. An etching solution may be provided to the resin layer BOP to remove a portion of the shell included in each nanoparticle OP-P. The etching solution provided to the resin layer BOP is not limited to a certain embodiment, and any solution having etching properties may be applicable to the present invention. The etching process of the resin layer BOP may be a dry etching process or a wet etching process, and is not limited to a certain process.

[0104] Next, the preliminary optical auxiliary layer OAL-P having the plurality of recessed portions OP formed therein may be provided with a substance CF-R for forming a color filter layer CF, thereby forming the optical auxiliary layer OAL. The substance CF-R for forming the color filter layer CF may be formed with the first to third color filter portions CF-1 to CF-3 ( Figure 2 ) and the light shielding part BM( Figure 2 ) are the same as at least one of the substances included in the optical auxiliary layer OAL-P. The step of forming the color filter layer CF may include a step S300 of providing the substance CF-R for forming the color filter layer CF to the preliminary optical auxiliary layer OAL-P. The step S300 of forming the optical auxiliary layer OAL and the color filter layer CF may be performed in a continuous process, and the step of forming the optical auxiliary layer OAL and the step of forming the color filter layer CF may include the same process.

[0105] The manufacturing method of the display device DD may include a step S400 of forming a color control layer CL on the color filter layer CF. A plurality of quantum dots QD-G, QD-R ( Figure 2 ) substance, thereby forming a color control layer CL.

[0106] exist Figure 7 and Figure 8 , the optical auxiliary layer OAL is a single layer, but as described above, the optical auxiliary layers OAL-a, OAL-b ( Figure 4 and Figure 5 ) may include a plurality of sub-optical auxiliary layers SOAL( Figure 4 and Figure 5 ) is formed by a plurality of layers. That is, the preliminary optical auxiliary layer OAL-P may include a plurality of preliminary sub-optical auxiliary layers. Each preliminary sub-optical auxiliary layer may include a base resin and a plurality of recessed portions.

[0107] The manufacturing method of the display device DD of an embodiment may include the step of forming an optical auxiliary layer OAL. The optical auxiliary layer OAL involved in an embodiment may include a base portion BP and a plurality of recessed portions OP defined in the base portion BP, and the optical auxiliary layer OAL may be configured between the substrate BS2 and the color filter layer CF. The optical auxiliary layer OAL configured between the substrate BS2 and the color filter layer CF may contribute to the improvement of the reflectivity of the display device DD.

[0108] [Example]

[0109] Hereinafter, a display device including an optical auxiliary layer according to an embodiment of the present invention will be described in detail with reference to examples and comparative examples. The following examples are merely illustrative examples to help understand the present invention and do not limit the scope of the present invention.

[0110] In Table 1, "SCI" ​​means total reflection (Specular Component Included), and "SCE" means diffuse reflection (Specular Component Excluded). Total reflection can be represented by the sum of the reflectivity based on diffuse reflection and the reflectivity based on specular reflection. "SCI-SCE" means specular reflection with diffuse reflection excluded from total reflection.

[0111] The diffuse reflection SCE represents the sum of the reflectances based on diffuse reflection measured for the layer including quantum dots and scattering particles, the layer including pigments, and the layer including a protective film, respectively.

[0112] Specular reflection is the sum of the reflectances of reflection at the interface between a glass substrate and an air layer, reflection at the interface between a glass substrate and a color filter layer, and reflection at the interface between a color filter portion and a light shielding portion.

[0113]

Table 1

[0114] distinguish Comparative Example 1 Example 1 SCI 1.3％ 1.0％ SCE 0.75％ 0.75％ SCI-SCE 0.55％ 0.25％

[0115] In Table 1, the display device of Example 1 is a display device including the optical auxiliary layer of an embodiment, and the display device of Comparative Example 1 is a display device not including the optical auxiliary layer. The value of Comparative Example 1 is the reflectivity shown in the display device not including the optical auxiliary layer, and the value of Example 1 is the reflectivity shown in the display device including the optical auxiliary layer.

[0116] It can be confirmed that the reflectivity based on diffuse reflection has the same value in the display device of Comparative Example 1 and the display device of Example 1. For the reflectivity based on mirror reflection, the display device of Example 1 has a smaller value than that of the display device of Comparative Example 1. Referring to Table 1, it can be seen that the reflectivity based on mirror reflection in the display device of Example 1 is reduced by 0.3% compared with the display device of Comparative Example 1. As the reflectivity based on mirror reflection decreases in the display device of Example 1, the total reflectivity represented by the sum of the reflectivity based on mirror reflection and the reflectivity based on diffuse reflection shows a reduced value in Example 1. Therefore, the display device including the optical auxiliary layer of one embodiment can reduce the reflectivity based on mirror reflection, and can show the characteristics of improved total reflectivity.

[0117] According to one embodiment, the optical auxiliary layer may include a base portion and a plurality of recessed portions defined in the base portion, and the optical auxiliary layer may be provided between the substrate and the color filter layer disposed on the lower side of the substrate. In addition, the average refractive index of the optical auxiliary layer may be higher than the average refractive index of the substrate and lower than the average refractive index of the color filter layer, and a display device of one embodiment in which the optical auxiliary layer is disposed between the substrate and the color filter layer may improve the reflectivity between the substrate and the color filter layer.

[0118] The manufacturing method of a display device of an embodiment may include the step of forming an optical auxiliary layer, and the optical auxiliary layer may be formed by filling a color filter layer material into a recessed portion formed by etching a plurality of nanoparticles. The optical auxiliary layer may be formed on a substrate, and a color filter layer may be formed on the optical auxiliary layer. Therefore, the display device manufactured by the manufacturing method of a display device of an embodiment may exhibit a characteristic of improved reflectivity between the substrate and the color filter layer.

[0119] The preferred embodiments of the present invention are described above with reference to the embodiments, but a person skilled in the art or a person having general knowledge in the art should be able to understand that the present invention may be modified or altered in various ways without departing from the scope of the concept and technical field of the present invention as described in the claims.

[0120] Therefore, the technical scope of the present invention is not limited to the contents described in the detailed description of the specification, but should be determined only by the claims.

Claims

1. A display device, comprising: substrate; A color filter layer is disposed on the lower side of the substrate; A color control layer, disposed on the lower side of the color filter layer; an optical auxiliary layer, disposed between the substrate and the color filter layer, and comprising a base portion and a plurality of recessed portions defined in the base portion and recessed toward the substrate, The average refractive index of the optical auxiliary layer is higher than the average refractive index of the substrate and lower than the average refractive index of the color filter layer. The optical auxiliary layer includes a plurality of sub-optical auxiliary layers, each of which includes the base portion and the recessed portion. Positions of the recessed portions of each of the sub-optical auxiliary layers are irregularly arranged.

2. The display device according to claim 1, wherein: Each of the recessed portions comprises: an outer contour; and A core portion is defined by the outer portion and filled with the color filter layer.

3. The display device according to claim 2, wherein: Each of the cores includes at least one of a pigment and a dye included in the color filter layer.

4. The display device according to claim 1, wherein: Each of the depressed portions has a hemispherical shape, and an average diameter of each of the depressed portions is greater than or equal to 200 nm and less than or equal to 500 nm.

5. The display device according to claim 1, wherein: Each of the recessed portions is derived from at least one of the hollow silica particles, a hollow polymer, and a porogen.

6. The display device according to claim 1, wherein: The color filter layer comprises: a first color filter portion that transmits the first light; a second color filter portion that transmits second light different from the first light; a third color filter portion that transmits third light different from the first light and the second light; and a light shielding portion disposed between the first color filter portion and the second color filter portion and between the second color filter portion and the third color filter portion, Each of the recessed portions includes the same material as at least one of the first color filter portion, the second color filter portion, the third color filter portion, and the light shielding portion.

7. The display device according to claim 1, wherein: The base portion includes at least one of acrylic resin, epoxy resin and Cardo resin.

8. The display device according to claim 1, wherein: A difference between an average refractive index of the base portion and an average refractive index of the substrate is greater than or equal to 0 and less than or equal to 0.

2.

9. The display device according to claim 8, wherein: The average refractive index of the substrate is greater than 1.4 and less than 1.5, The average refractive index of the base portion is greater than or equal to 1.4 and less than or equal to 1.6.

Images