Laminate, method for manufacturing the laminate, and image display device including the laminate

Abstract

To provide a laminate capable of preventing problems such as jetting failure generated in an ink jet process, upon forming a color conversion ink layer through the ink jet process.SOLUTION: A laminate comprises a base material, a light source formed on the base material, a light refraction layer formed on the light source, and a color conversion ink layer formed on the light refraction layer. The refractive index of the light refraction layer is 0.3 or more smaller than the refractive index of the color conversion ink layer. The refractive index difference (first refractive index difference) between the light refraction layer and the color conversion ink layer is larger than the refractive index difference (second refractive index difference) between the uppermost layer of the light source and the light refraction layer.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a laminate, a method for manufacturing the laminate, and an image display device including the laminate.

Background Art

[0002] Liquid crystal display devices use color filters for color formation. By the way, when light emitted from a white backlight source passes through red, green, and blue color filters, light of a specific wavelength is absorbed, and light of a specific wavelength is transmitted to exhibit a desired hue. The light transmitted in this way has problems of many losses because it is light distinguished into absorption and transmission when compared with the backlight where the light is generated.

[0003] Recently, research on displays using a color conversion layer has been conducted. As an example, in a display structure including a color conversion layer together with a backlight that emits blue light, blue pixels can use the blue light of the backlight as it is, so that the light of the backlight can be used completely. Further, in a color conversion layer display, pixels that display red or green perform color conversion from blue to red or green for display. Therefore, compared with the existing color filter method that uses absorption and transmission, the light loss is small, and better light efficiency can be exhibited.

[0004] Generally, in the case of the photolithography process used for manufacturing color conversion pixels for a color conversion layer, there is an advantage that the process is simple and the same product can be mass-produced. However, there are problems such as the generation of a large amount of wastewater, a small amount of the actually used material compared to the consumed material, and most of it being discarded. Recently, as a manufacturing process for the pixels under consideration, there is an inkjet process. The inkjet process fills the material at a desired position while the nozzle moves, does not generate wastewater, and can reduce the amount of discarded material. This has a higher advantage when using expensive materials. Color conversion pixels generally use materials with a size at the nanometer level, and it is very difficult to mass-produce particles with a uniform size, so the price of the material is very high. In the case of such materials, the inkjet process can be a more advantageous method than the generally used photolithography process.

[0005] What is necessary for the progress of such an inkjet process is a partition wall and ink. In the case of the partition wall, it serves a role like a dyke that divides each pixel region for containing ink. In the case of ink, in the state where the dyke is formed, it serves a role of filling the pixel region with ink through a nozzle to form color conversion pixels. Color conversion pixels need to be formed with a film thickness of about 7 μm to 15 μm depending on the conversion efficiency, which is different from the existing color filter formed with a film thickness of about 1 μm to 1.5 μm. Therefore, it is necessary to improve to form color conversion pixels using a smaller amount of ink and prevent the peeling of the formed color conversion pixels.

[0006] In relation to this, Korean Patent Publication No. 10-2014-0093512 aims to uniformly adjust the thickness of the organic light-emitting ink by discharging an ink non-reactive solvent prior to discharging the organic light-emitting ink for forming an organic light-emitting layer, but the above-mentioned problems have not been sufficiently improved.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] The present invention is for improving the above-described conventional technical problems, and an object thereof is to provide a laminate capable of preventing problems such as jetting defects occurring in the inkjet process when forming a color conversion ink layer through the inkjet process.

[0009] Another object is to provide a laminate capable of preventing the problem that the formed color conversion ink layer peels off from the laminate and capable of exhibiting excellent luminance.

[0010] Also, the present invention aims to provide a method for manufacturing the laminate and an image display device including the laminate.

Means for Solving the Problems

[0011] The present invention includes a substrate; a light source formed on the substrate; a light refraction layer formed on the light source; and a color conversion ink layer formed on the light refraction layer, wherein the refractive index of the light refraction layer is at least 0.3 smaller than the refractive index of the color conversion ink layer, and a laminate is provided in which the refractive index difference (first refractive index difference) between the light refraction layer and the color conversion ink layer is larger than the refractive index difference (second refractive index difference) between the uppermost layer of the light source and the light refraction layer.

[0012] Also, the present invention provides a method for manufacturing a laminate including a step of forming a light source on a substrate; a step of forming a light refraction layer on the light source; and a step of forming a color conversion ink layer on the light refraction layer, wherein the refractive index of the light refraction layer is at least 0.3 smaller than the refractive index of the color conversion ink layer, and the refractive index difference (first refractive index difference) between the light refraction layer and the color conversion ink layer is larger than the refractive index difference (second refractive index difference) between the uppermost layer of the light source and the light refraction layer.

[0013] Also, the present invention provides an image display device including the laminate.

Advantages of the Invention

[0014] The laminate of the present invention includes a light refractive layer having a refractive index smaller than that of the color conversion ink layer between the light source and the color conversion ink layer, and by adjusting the refractive index difference between the light refractive layer and the color conversion ink layer to be larger than the refractive index difference between the uppermost layer of the light source and the light refractive layer, it has the effect of further improving the brightness of the image display device.

[0015] Also, the laminate of the present invention can prevent jetting defects generated in the inkjet process by adjusting the surface energy of the light refractive layer to a specific range, and can form the color conversion ink layer using a smaller amount of ink, thereby having the effect of preventing the problem that the color conversion ink layer formed in this way peels off from the laminate.

[0016] In addition, the laminate according to the present invention can be effectively applied to an image display device, thereby providing a high-quality image display device having excellent brightness and no defects due to peeling of the color conversion ink layer.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

DETAILED DESCRIPTION OF THE INVENTION

[0018] The present invention includes a substrate; a light source formed on the substrate; a photorefractive layer formed on the light source; and a color conversion ink layer formed on the photorefractive layer. The refractive index of the color conversion ink layer is at least 0.3 smaller than the refractive index of the photorefractive layer, and the refractive index difference (first refractive index difference) between the photorefractive layer and the color conversion ink layer is larger than the refractive index difference (second refractive index difference) between the uppermost layer of the light source and the photorefractive layer, and provides a laminate.

[0019] The present invention also includes a step of forming a light source on a substrate; a step of forming a photorefractive layer on the light source; and a step of forming a color conversion ink layer on the photorefractive layer. The refractive index of the color conversion ink layer is at least 0.3 smaller than the refractive index of the photorefractive layer, and the refractive index difference (first refractive index difference) between the photorefractive layer and the color conversion ink layer is larger than the refractive index difference (second refractive index difference) between the uppermost layer of the light source and the photorefractive layer, and provides a method for manufacturing a laminate.

[0020] The present invention also provides an image display device including the laminate. The laminate of the present invention has a certain refractive index difference between the light source and the color conversion ink layer, and the refractive index difference (first refractive index difference) between the photorefractive layer and the color conversion ink layer is larger than the refractive index difference (second refractive index difference) between the uppermost layer of the light source and the photorefractive layer. By forming a photorefractive layer having a specific range of surface energy, a color conversion ink layer can be formed using a smaller amount of ink, and the problem that the formed color conversion ink layer is peeled off from the laminate can be prevented. It has been experimentally confirmed that the brightness of an image display device including this can be improved, and the present invention has been completed.

[0021] The advantages and features of the present invention, and the methods for achieving them, should become clear by referring to the embodiments described in detail below together with the accompanying drawings. The present invention is not limited to the embodiments disclosed below and can be embodied in various forms. These embodiments are provided to make the disclosure of the present invention complete and to fully inform those with ordinary knowledge in the technical field to which the present invention pertains of the scope of the invention.

[0022] The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are exemplary, so the present invention is not limited to the matters illustrated. Throughout the specification, the same reference numerals refer to the same components.

[0023] In the description of the present invention, when it is determined that a specific description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. When terms such as "including", "having", "becoming", etc. mentioned in this specification are used, other parts may be added unless "only" is used.

[0024] In the interpretation of components, when it is an explanation of the positional relationship, for example, when the positional relationship between two parts is described by "on ~", "above ~", "below ~", "on the side of ~", etc., unless "immediately" or "directly" is used, one or more other components may be arranged between the two parts.

[0025] The features of each of the various embodiments of the present invention can be partially or wholly combined or combined with each other, and can be technically linked and driven in various ways. Also, each embodiment can be implemented independently of each other, or can be implemented together due to the related relationship.

[0026] Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, the following drawings attached to this specification illustrate preferred embodiments of the present invention and, together with the above-described invention content, serve to further understand the technical idea of the present invention. Therefore, the present invention should not be limited to and construed only based on the matters described in such drawings.

[0027] Laminate The laminate of the present invention includes a base material (100), a light source (200) formed on the base material, a light refractive layer (300) formed on the light source, and a color conversion ink layer (400) formed on the light refractive layer, and may include a partition wall (500) formed so as to have an opening exposing the light source on the base material.

[0028] The light source (200) formed on the base material includes both a structure in which the light source is formed on the upper surface of the base material and a structure in which the light source is provided in the base material and the upper surface of the base material coincides with the upper surface of the light source.

[0029] FIG. 4 is a cross-sectional view for explaining a laminate according to an embodiment of the present invention, including a base material (100), a light source (200) formed on the upper part of the base material, a light refractive layer (300) formed on the light source, and a color conversion ink layer (400) formed on the light refractive layer, and including a partition wall (500) formed so as to have an opening exposing the light source on the base material.

[0030] The substrate (100) can use a general substrate used in the field of image display devices, and a flexible material can preferably be used. For example, cycloolefin polymer (COP), polyethylene terephthalate (PET), polyacrylate rubber (PAR), polyether imide (PEI), polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), polyallylate, polyimide (PI), cellulose acetate propionate (CAP), polyethersulfone (PES), triacetate cellulose (TAC), polycarbonate (PC), cycloolefin copolymer (COC), polymethyl methacrylate (PMMA), etc. can be mentioned. Preferably, it can be formed of any one or more of polyethylene terephthalate (PET), cycloolefin polymer (COP), and polyimide (PI, refractive index 1.72).

[0031] The thickness of the substrate may be 10 to 100 μm, preferably 20 to 50 μm. The light source (200) is formed on the substrate (100). The light source (200) generates light necessary for displaying an image on the image display device, and for example, it may be a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp (EEFL), a flat fluorescent lamp (FFL), an organic light emitting diode (OLED), or a light emitting diode (LED), but is not limited thereto. Also, various layers can be introduced on top of the light source. As an example, in the case of an organic light emitting diode, it is configured in a form where a light emitting layer is positioned between the cathode and the anode. However, in order to ensure the reliability of the organic light emitting diode, a thin film encapsulation process is performed. The thin film encapsulation process is applied for the purpose of protecting the OLED element from the external environment (such as moisture and air). A typical structure thereof is a structure in which an inorganic layer and an organic layer are repeatedly formed, and a SiOx inorganic layer may be positioned in the topmost layer.

[0032] The light refraction layer (300) is formed on the light source (200). The light refraction layer (300) is characterized by being formed between the light source (200) and a color conversion ink layer (400) described later. When forming the color conversion ink layer (400), it plays a role of improving the inkjet process characteristics, reflecting the light traveling in the direction of the light source (200) among the emitted light generated in the color conversion ink layer (400), and improving the overall luminance.

[0033] The film thickness of the light refraction layer (300) can be characterized by being 1.0 μm or less, preferably 0.05 - 0.8 μm, and more preferably 0.1 - 0.3 μm. When the film thickness of the light refraction layer (300) satisfies the above range, among the emitted light generated in the color conversion ink layer (400), the light traveling in the direction of the light source (200) can be effectively reflected, and the overall luminance can be further improved, so it is preferable.

[0034] The color conversion ink layer (400) is formed on the photorefractive layer (300). The color conversion ink layer (400) converts the wavelength of the light incident from the light source (200) into light of other specific wavelengths. For such wavelength conversion of light, the color conversion ink layer (400) contains quantum dots, and the quantum dots convert the light from the light source into green or red light and scatter it.

[0035] The color conversion ink layer (400) containing quantum dots, unlike the existing color filter containing a colorant, needs to be formed with a thickness of about 5 μm to 15 μm in consideration of the color conversion efficiency. Thus, as the thickness of the color conversion ink layer (400) increases, when forming the color conversion ink layer (400) through an inkjet process, more ink needs to be jetted, so there is a problem that the process characteristics deteriorate. Also, as the thickness of the color conversion ink layer (400) increases, the volume with respect to the area where the color conversion ink layer (400) contacts the lower layer increases, so the adhesion of the color conversion ink layer to the lower layer deteriorates, and there is a problem that the color conversion ink layer (400) peels off from the laminate.

[0036] The laminate of the present invention can be characterized in that the surface energy of the photorefractive layer (300) is 24.9 to 43.3 dyne / cm, and more preferably may be 28.8 to 35.5 dyne / cm. When the surface energy of the photorefractive layer (300) is controlled to have the above range, when forming the color conversion ink layer (400) through an inkjet process, all pixel portions can be filled using a smaller amount of ink, the process speed can be improved, problems such as jetting defects can be prevented, and generally the inkjet process characteristics can be improved, and it is preferable because peeling of the formed color conversion ink layer (400) from the laminate can be prevented.

[0037] On the one hand, the light scattered from the quantum dots is scattered in all directions due to the properties of the quantum dots. Among these, if the light scattered in the direction of the base material (100) can be reflected or refracted to contribute to the image display of the image display device, the light utilization efficiency can be improved.

[0038] The laminate of the present invention can be characterized in that the light refraction layer (300) has a refractive index smaller than that of the color conversion ink layer (400). Preferably, the light refraction layer (300) may have a refractive index smaller by 0.3 or more than that of the color conversion ink layer (400). When the light refraction layer (300) has a refractive index smaller than that of the color conversion ink layer (400) in this way, among the light scattered by the quantum dots in the color conversion ink layer, the light scattered in the direction of the base material (100) can be reflected or refracted in the opposite direction, whereby the luminance of the image display device can be improved, which is preferable.

[0039] The color conversion ink layer (400) may have a refractive index of 1.8 to 2.0. Also, the light refraction layer (300) may have a refractive index of 1.33 to 1.5, and preferably may be 1.33 to 1.4. When the refractive index of the light refraction layer (300) satisfies the above range, it can be adjusted to have a refractive index smaller than that of the color conversion ink layer (400), whereby the luminance of the image display device can be improved, which is preferable.

[0040] Further, the laminate of the present invention is characterized in that the refractive index difference between the light refraction layer (300) and the color conversion ink layer (400) (hereinafter referred to as "the first refractive index difference") is larger than the refractive index difference between the uppermost layer of the light source (200) and the light refraction layer (300) (hereinafter referred to as "the second refractive index difference"). When the first refractive index difference is larger than the second refractive index difference, the total reflection angle is improved, and the effect of improving the luminance of the product can be maximized, which is preferable.

[0041] The uppermost layer of the light source (200) may have a refractive index of 1.45 to 1.55, or preferably 1.48 to 1.52. When the refractive index of the uppermost layer of the light source (200) satisfies the above range, it is preferable because the uppermost layer of the light source (200) can be adjusted to have a refractive index larger than that of the light refraction layer (300).

[0042] The partition wall (500) serves as a bank for partitioning each pixel region for filling the color conversion ink layer, and is formed to have an opening for exposing the light source (200) on the substrate (100).

[0043] As described above, since the color conversion ink layer (400) needs to be formed with a film thickness of about 5 μm to 15 μm depending on the conversion efficiency, the partition wall (500) also needs to be formed with a film thickness of about 5 μm to 15 μm.

[0044] FIG. 5 is a cross-sectional view for explaining a laminate according to another embodiment of the present invention, including a substrate (100) provided with a light source (200), a light refraction layer (300) formed on the light source, and a color conversion ink layer (400) formed on the light refraction layer, and including a partition wall (500) formed to have an opening for exposing the light source on the substrate. Even in this case, the light refraction layer (300) has a structure in contact with the uppermost layer of the light source (200). Therefore, the above description regarding the first refractive index difference and the second refractive index difference can be similarly applied to the structure of this embodiment.

[0045] Thus, in the laminate of the present invention, the light source (200) may have a structure formed on the upper surface of the substrate (100) as shown in FIG. 4, or may be provided in the substrate as shown in FIG. 5, and the upper surface of the substrate and the upper surface of the light source may coincide with each other, which can be appropriately selected according to the specific type of the light source and the like.

[0046] Composition for forming a photorefractive layer The light refraction layer (300) is formed from a composition for forming a light refraction layer, and the composition for forming a light refraction layer may contain scattering particles.

[0047] The scattering particles can be selected and used from known scattering particles in this field without special restrictions. For example, they may include one or more selected from the group consisting of Al2O3, SiO2, ZnO, ZrO2, BaTiO3, TiO2, Ta2O5, Ti3O5, ITO, IZO, ATO, ZnO-Al, Nb2O3, SnO, and MgO. Further, if necessary, a material surface-treated with a compound having an unsaturated bond such as acrylate may be used, or preferably, one or more of low refractive index silicon particles and hollow particles with a hollow interior may be used. As the hollow particles, hollow silica, hollow titanium dioxide, gold-aluminum-titanium dioxide-polymethacrylate hollow particles, etc. may be used.

[0048] The content of the scattering particles is not particularly limited, but may be included in an amount of 0.1 to 50% by weight, preferably 0.5 to 20% by weight, based on the total weight of the solid content in the composition for forming the photorefractive layer. When the scattering particles are included within the above range, it is advantageous for adjusting the refractive index of the photorefractive layer (300) within the target range.

[0049] In addition, the composition for forming the photorefractive layer may further contain a binder resin, a photopolymerizable compound, a photoinitiator, and a solvent.

[0050] The binder resin may be composed of an acrylic resin, a siloxane resin, polyisoprene, a vinyl resin, an epoxy resin, a urethane resin, a cellulose resin, a perylene resin, etc., or preferably, may contain both an acrylic resin and a siloxane resin.

[0051] The content of the binder resin is not particularly limited, but may be included in an amount of 20 to 70% by weight, preferably 30 to 60% by weight, based on the total weight of the solid content in the composition for forming the photorefractive layer. When the binder resin is included within the above range, the solubility in the developer is sufficient, the formation of the cured film is easy, the reduction of the film in the pixel portion of the exposed portion during development is prevented, and the chipping property of the non-exposed portion is good, so it is preferable.

[0052] The photopolymerizable compound is a compound that can be polymerized by the action of light and a photopolymerization initiator described later, and can be used without special restrictions in the industry. Examples include monofunctional monomers, difunctional monomers, and other polyfunctional monomers.

[0053] The type of the monofunctional monomer is not particularly limited, and examples include nonylphenyl carbitol acrylate, 2-hydroxy-3-phenoxypropyl acrylate, 2-ethylhexyl carbitol acrylate, 2-hydroxyethyl acrylate, N-vinylpyrrolidone, and the like.

[0054] The type of the difunctional monomer is not particularly limited, and examples include 1,6-hexanediol di(meth)acrylate, ethylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, bis(acryloyloxyethyl) ether of bisphenol A, 3-methylpentanediol di(meth)acrylate, and bisphenoxyethanol fluorene-based compounds.

[0055] The type of the polyfunctional monomer is not particularly limited, and examples include trimethylolpropane tri(meth)acrylate, ethoxylated trimethylolpropane tri(meth)acrylate, propoxylated trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol tri(meth)acrylate, dipentaerythritol penta(meth)acrylate, ethoxylated dipentaerythritol hexa(meth)acrylate, propoxylated dipentaerythritol hexa(meth)acrylate, and dipentaerythritol hexa(meth)acrylate. Among these, polyfunctional monomers having two or more functional groups can be preferably used.

[0056] Examples of commercially available photopolymerizable compounds include, but are not limited to, A9550 from Shin-Nakamura Chemical Co., Ltd., KAYARAD DPHA from Nippon Kayaku Co., Ltd., and CHTH-2553 from Chemtron Corp.

[0057] The content of the photopolymerizable compound is not particularly limited, but may be contained in an amount of 20 to 70% by weight, preferably 30 to 60% by weight, based on the total weight of the solid content in the composition for forming the photorefractive layer. When the photopolymerizable compound is contained within the above range, it is preferable in terms of the strength and smoothness of the photorefractive layer.

[0058] The photopolymerization initiator can be selected and used from known photopolymerization initiators in this field without particular limitation. For example, acetophenone-based, benzophenone-based, triazine-based, thioxanthone-based, oxime-based, benzoin-based, biimidazole-based compounds, etc. can be used.

[0059] For example, as the oxime-based compound, o-ethoxycarbonyl-α-oximino-1-phenylpropan-1-one, etc. can be used, and commercially available products include OXE-01, OXE-02, OXE-03 from Basf, etc., but are not limited thereto. The photopolymerization initiator can be used alone or in admixture of two or more.

[0060] The content of the photopolymerization initiator may be contained in an amount of 0.01 to 10% by weight, preferably 0.01 to 5% by weight, based on the total weight of the solid content in the photosensitive resin composition. When the photopolymerization initiator is contained within the above range, the photopolymerization reaction rate is appropriate, an increase in the overall process time is prevented, and a decrease in the physical properties of the final cured film due to overreaction can be prevented, which is preferable.

[0061] The above solvent can be used without special restrictions in the industry. Specifically, ethylene glycol monoalkyl ethers such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, and ethylene glycol monobutyl ether; diethylene glycol dialkyl ethers such as diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dipropyl ether, and diethylene glycol dibutyl ether; ethylene glycol alkyl ether acetates such as methyl cellosolve acetate and ethyl cellosolve acetate; alkylene glycol alkyl ether acetates such as propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, and propylene glycol monopropyl ether acetate; alkoxyalkyl acetates such as methoxybutyl acetate and methoxypentyl acetate; aromatic hydrocarbons such as benzene, toluene, xylene, and mesitylene; ketones such as methyl ethyl ketone, acetone, methyl amyl ketone, methyl isobutyl ketone, and cyclohexanone; alcohols such as ethanol, propanol, butanol, hexanol, cyclohexanol, ethylene glycol, and glycerin; esters such as ethyl 3-ethoxypropionate and methyl 3-methoxypropionate; cyclic esters such as γ-butyrolactone, etc. can be mentioned.

[0062] In terms of coatability and drying properties, preferably, an organic solvent with a boiling point of 100°C to 200°C among the above solvents can be used, and preferably, propylene glycol monomethyl ether acetate can be used.

[0063] The content of the solvent is not particularly limited, but may be contained in an amount of 60 to 90% by weight, preferably 70 to 85% by weight, based on the total weight of the composition for forming the photorefractive layer. When the solvent is contained within the above content range, it is preferable because it provides an effect of improving coatability when coated with a coating device such as a roll coater, a spin coater, a slit and spin coater, a slit coater (sometimes also referred to as a die coater), or an inkjet.

[0064] The composition for forming the photorefractive layer may further contain an additive within a range that does not inhibit its purpose. The additive is a component that can be further included according to the needs of the user, and the type thereof is not particularly limited in the present invention. Examples thereof include an adhesion promoter or a surfactant for enhancing the coating property or adhesion of the composition for forming the photorefractive layer.

[0065] The adhesion promoter may be added to enhance the adhesion to the substrate, and may include, but is not limited to, a silane coupling agent having a reactive substituent selected from the group consisting of a carboxyl group, a methacryloyl group, an isocyanate group, an epoxy group, and combinations thereof. For example, the silane coupling agent includes trimethoxysilylbenzoic acid, γ-methacryloxypropyltrimethoxysilane, vinyltriacetoxysilane, vinyltrimethoxysilane, γ-isocyanatepropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, etc. These can be used alone or in combination of two or more.

[0066] When the composition for forming the photorefractive layer contains the surfactant, there is an advantage that the coating property can be further improved. For example, the surfactant may be a fluorosurfactant such as BM-1000, BM-1100 (manufactured by BM Chemie), Prolide FC-135 / FC-170C / FC-430 (manufactured by Sumitomo 3M Limited), SH-28PA / -190 / SZ-6032 (manufactured by Toray Silicon Co., Ltd.), R-40, R-41, R-43, R-94, F-447, F-554, F-556 (manufactured by DIC Corporation), etc., but is not limited thereto.

[0067] Composition for forming a color conversion ink layer The color conversion ink layer (400) is formed from a composition for forming a color conversion ink layer, and the composition for forming a color conversion ink layer may contain quantum dots.

[0068] The quantum dots may be particulate substances that emit a specific color while electrons transfer from the conduction band to the valence band, and are not particularly limited as long as they are particles that can emit light by stimulation with light or electricity. For example, they may be selected from the group consisting of II-VI group semiconductor compounds; III-V group semiconductor compounds; IV-VI group semiconductor compounds; group IV elements or compounds containing the same; and combinations thereof, and these may be used alone or in admixture of two or more. In one embodiment of the present invention, indium phosphide (InP) was used.

[0069] The composition for forming a color conversion ink layer may further contain a binder resin, a photopolymerizable compound, a photopolymerization initiator, and a solvent, and the descriptions of the binder resin, the photopolymerizable compound, the photopolymerization initiator, and the solvent are the same as those in the composition for forming a photorefractive layer described above.

[0070] Also, the composition for forming a color conversion ink layer may further contain additives within a range that does not inhibit its purpose. For example, an adhesion promoter or a surfactant for enhancing the coating property or adhesion of the composition for forming a color conversion ink layer may be mentioned, and the descriptions of the adhesion promoter and the surfactant are the same as those in the composition for forming a photorefractive layer described above.

[0071] Composition for forming partition walls The partition wall (500) is formed from a partition wall-forming composition, and the partition wall-forming composition may contain a colorant.

[0072] The colorant is not particularly limited in type, but may include a white pigment and / or a black pigment. Thus, when forming a partition wall using a partition wall-forming composition containing a white pigment and / or a black pigment, the absorbance can be reduced, and the transmittance and reflectance can be further improved, which has the advantage of excellent light efficiency, so it is preferable.

[0073] The white pigment is not particularly limited in type, but may include one or more selected from the group consisting of C.I. Pigment White 4, 5, 6, 6:1, 7, 18, 18:1, 19, 20, 22, 25, 26, 27, and 28, and preferably may include C.I. Pigment White 6.

[0074] The black pigment is not particularly limited in type, but may include one or more selected from C.I. Pigment Black 1 and 7, and preferably may include C.I. Pigment Black 7.

[0075] The colorant may further contain other pigments or dyes other than the white pigment or black pigment, if necessary. As the pigment, an organic pigment or an inorganic pigment generally used in the art may be used, and as long as the dye has solubility in an organic solvent, it can be used without limitation.

[0076] The partition wall-forming composition according to the present invention may further contain a binder resin, a photopolymerizable compound, a photopolymerization initiator, and a solvent, and the descriptions of the binder resin, the photopolymerizable compound, the photopolymerization initiator, and the solvent are the same as those in the above-described photorefractive layer-forming composition.

[0077] Further, the composition for forming the partition may further contain an additive as long as the object is not inhibited. For example, there may be mentioned an adhesion promoter, a surfactant, a liquid repellent, etc. for enhancing the coating property or adhesion of the composition for forming the partition. The descriptions of the adhesion promoter and the surfactant are the same as those in the composition for forming the photorefractive layer described above.

[0078] The liquid repellent can be added to adjust the surface energy of the partition, and a fluorine-based or silicon-based additive or the like may be used, but is not limited thereto.

[0079] Method for manufacturing a laminate The present invention provides a method for manufacturing a laminate including a step of forming a light source on a substrate; a step of forming a photorefractive layer on the light source; and a step of forming a color conversion ink layer on the photorefractive layer.

[0080] Further, the method for manufacturing a laminate according to the present invention is characterized by further including a step of forming a partition having an opening for exposing the light source on the substrate after the step of forming the light source on the substrate.

[0081] The method for manufacturing a laminate according to the present invention can be characterized in that the surface energy of the photorefractive layer is 24.9 to 43.3 dyne / cm, and more preferably may be 28.8 to 35.5 dyne / cm. When the surface energy of the photorefractive layer (300) is controlled to have the above range, in forming the color conversion ink layer (400) through an inkjet process, all pixel portions can be filled using a smaller amount of ink, the process speed can be improved, problems such as jetting failure can be prevented, etc., and generally the inkjet process characteristics can be improved, and peeling of the formed color conversion ink layer (400) from the laminate can be prevented, which is preferable.

[0082] Further, the method for manufacturing the laminate according to the present invention can be characterized in that the refractive index of the photorefractive layer (300) is smaller than the refractive index of the color conversion ink layer (400), and preferably may have a refractive index smaller by 0.3 or more. When the photorefractive layer (300) has a refractive index smaller than that of the color conversion ink layer (400) in this way, among the light scattered by the quantum dots of the color conversion ink layer, the light scattered in the direction of the substrate (100) can be reflected or refracted in the opposite direction, thereby improving the brightness of the image display device, which is preferable.

[0083] Furthermore, in the method for manufacturing the laminate according to the present invention, it is more preferable that the refractive index difference (first refractive index difference) between the photorefractive layer (300) and the color conversion ink layer (400) is larger than the refractive index difference (second refractive index difference) between the uppermost layer of the light source (200) and the photorefractive layer (300). When the first refractive index difference is larger than the second refractive index difference, the angle of total reflection is improved, and the effect of improving the brightness of the product can be maximized, which is preferable.

[0084] Image display device The image display device according to another aspect of the present invention includes the above-described laminate, and thus has an advantage of being able to provide a high-quality image display device with excellent brightness and no defects due to peeling of the color conversion ink layer.

[0085] Specifically, the image display device may include other components normally included in an image display device, such as an optical film, in addition to the laminate of the present invention, and the present invention is not limited thereto.

[0086] Specifically, the image display device includes, but is not limited to, a liquid crystal display (liquid crystal display device; LCD), an organic EL display (including an organic EL display device, OLED, and QLED), an inorganic light emitting diode (LED) display, a liquid crystal projector, a display device for games, a display device for portable terminals such as mobile phones, a display device for digital cameras, a display device for car navigation, and the like.

Example

[0087] Hereinafter, the present invention will be described in more detail based on examples. However, the embodiments of the present invention disclosed below are merely illustrative, and the scope of the present invention is not limited to those embodiments. The scope of the present invention is indicated in the claims, and further includes all modifications within the meaning and scope equivalent to the description of the claims. In the following examples and comparative examples, “%” and “parts” indicating the content are based on mass unless otherwise specified.

[0088] <Example> Synthesis Example 1: Synthesis of Binder Resin (B1) A flask equipped with a stirrer, a thermometer, a reflux condenser, a dropping funnel, and a nitrogen inlet tube was prepared. On the other hand, 15 parts by weight of N-benzylmaleimide, 30 parts by weight of acrylic acid, 50 parts by weight of cyclohexyl methacrylate, 5 parts by weight of methyl methacrylate, 4 parts by weight of t-butyl peroxy-2-ethylhexanoate, and 40 parts by weight of propylene glycol monomethyl ether acetate (hereinafter also referred to as PGMEA) were charged. After that, they were stirred and mixed to prepare a monomer dropping funnel. 6 parts by weight of n-dodecanediol and 24 parts by weight of PGMEA were put in and stirred and mixed to prepare a chain transfer agent dropping funnel.

[0089] Thereafter, 395 parts by weight of PGMEA was introduced into the flask, the atmosphere in the flask was replaced from air to nitrogen, and then the temperature of the flask was raised to 90 °C while stirring. Subsequently, the dropping of the monomer and the chain transfer agent was started from the dropping funnel. The dropping was carried out for 2 hours each while maintaining 90 °C. After raising the temperature to 110 °C and holding for 3 hours after 1 hour, a gas introduction tube was introduced, and bubbling of an oxygen / nitrogen = 5 / 95 (v / v) mixed gas was started.

[0090] Subsequently, 20 parts by weight of glycidyl methacrylate, 0.4 part by weight of 2,2'-methylenebis(4-methyl-6-t-butylphenol), and 0.8 part by weight of triethylamine were charged into the flask, and the reaction was continued at 110 °C for 6 hours. Then, it was cooled to room temperature to obtain a binder resin B1 having a weight average molecular weight of 3,800 and an acid value of 83 mgKOH / g based on the solid content.

[0091] The weight average molecular weight (Mw) of the binder resin was measured using the GPC method, and an HLC-8120GPC (manufactured by Tosoh Corporation) apparatus was used. The measurement conditions were such that TSK-GEL G4000HXL and TSK-GEL G2000HXL columns were connected in series and used, and the temperature of the column was set to 40 °C. Tetrahydrofuran was used as the mobile phase solvent, and the measurement was carried out while flowing at a flow rate of 1.0 mL / min. The concentration of the measurement sample was 0.6% by weight, the injection volume was 50 mL, and the analysis was performed using an RI detector. As the calibration standard substance, TSK STANDARD POLYSTYRENE F-40, F-4, F-1, A-2500, A-500 (manufactured by Tosoh Corporation) were used, and the weight average molecular weight of the alkali-soluble resin obtained under the above conditions was measured.

[0092] Production Examples 1 and 2: Production of a composition for forming partition walls According to the composition and content shown in Table 1 below, the partition wall-forming compositions of Production Examples 1 and 2 were produced.

[0093]

Table 1

[0094] -PBK (Carbon black): C.I. Pigment black 7 (MA100, manufactured by Mitsubishi Corporation) -White 6 (Pigment White 6): C.I. Pigment White 6 (R-102, manufactured by Dupont Corporation) -Binder: Binder resin B1 according to Synthesis Example 1 -Monomer: Dipentaerythritol hexaacrylate (KAYARAD DPHA, manufactured by Nippon Chemical Co., Ltd.) -Initiator: IRGACURE OXE-03 (manufactured by BASF) -Additive: Silane coupling agent (KBM-9007, manufactured by Shin-Etsu Chemical Co., Ltd.) -Liquid repellent: Reactive liquid repellent (RS-90, manufactured by DIC Corporation) -Solvent: Propylene glycol monomethyl ether acetate (PGMEA) Production Examples 3 to 5: Production of a composition for forming a photorefractive layer According to the compositions and contents in Table 2 below, the compositions for forming a photorefractive layer of Production Examples 3 to 5 were produced, and the refractive indices of the respective compositions at a wavelength of 450 nm were measured.

[0095]

Table 2

[0096] - Scattering particles: Hollow silica (manufactured by Tosoh Silica Co., Ltd.) - Binder resin B1: Binder resin B1 according to Synthesis Example 1 - Binder resin B2: Siloxane-based binder resin (VINYL TERMINATED (35 - 45% TRIFLUOROPROPYLMETHYLSILOXANE)-DIMETHYLSILOXANE COPOLYMER) - Monomer C1: Dipentaerythritol hexaacrylate (KAYARAD DPHA, manufactured by Nippon Chemical Co., Ltd.) - Monomer C2: Bisphenoxy Ethanol Fluorene-based monomer (CHTH-2553, manufactured by Chemtron Co., Ltd.) - Initiator: IRGACURE OXE-03 (manufactured by BASF Co., Ltd.) - Additive: Silane coupling agent (KBM-9007, manufactured by Shin-Etsu Chemical Co., Ltd.) - Solvent: Propylene glycol monomethyl ether acetate (PGMEA) Production Example 6: Production of a composition for forming a color conversion ink layer According to the compositions and contents in Table 3 below, the composition for forming a color conversion ink layer of Production Example 6 was produced.

[0097]

Table 3

[0098] - Quantum dots: InP / ZnS (wavelength 630 nm, FWHM = 35 nm, manufactured by Nanoco Technologies Ltd.) - Binder resin: Card-based binder TSR-TB01 (refractive index 1.65, manufactured by Tacoma Co., Ltd.) - Monomer: 1,6 - hexanediol diacrylate (HDDA) - Initiator: IRGACURE OXE - 03 (manufactured by BASF) - Additive: Silane coupling agent (KBM - 9007, manufactured by Shin - Etsu Chemical Co., Ltd.) Examples 1 to 45 and Comparative Examples 1 to 19: Production of a laminate (1) Examples 1 - 6 and Comparative Examples 1 - 7 As shown in Figure 1, on a substrate on which a 30 mW blue light source with a maximum wavelength of 450 nm (a 5000 Å thick SiOx inorganic layer with a refractive index of 1.49, where the top layer was formed through a thin - film encapsulation process) was formed, using the composition for forming partition walls according to Production Example 1, a black partition wall (500) was formed so as to have an opening through which the light source as shown in Figure 2 was exposed. The thickness of the formed partition wall was measured to be 11 μm.

[0099] Subsequently, on the light source exposed through the opening, a composition obtained by mixing the compositions for forming a photorefractive layer according to Production Examples 3 - 5 at the content ratios described in Table 4 below was jetted by an ink - jet method, left standing at 90 °C for 90 seconds to remove the solvent, and a photorefractive layer (300) was formed as shown in Figure 3. The thickness of the formed photorefractive layer was measured to be 0.5 μm.

[0100] Thereafter, a composition for forming a color - conversion ink layer according to Production Example 6 was jetted by an ink - jet method onto the formed photorefractive layer, and an exposure process of 500 mJ was performed using a wavelength of 365 nm. Through the exposure process, the photo - initiation of the composition for forming the color - conversion ink layer proceeded and curing occurred, and a color - conversion ink layer (400) was formed as shown in Figure 4 to manufacture the laminates of Examples 1 - 6 and Comparative Examples 1 - 7. The thickness of the formed color - conversion ink layer was 10 μm, and the refractive index was measured to be 1.85.

[0101] (2) Examples 7 - 12 and Comparative Examples 8 - 14 Laminates of Examples 7 - 12 and Comparative Examples 8 - 14 were manufactured in the same manner as in (1) above, except that a white partition wall was formed using the composition for forming partition walls according to Production Example 2 instead of the composition for forming partition walls according to Production Example 1.

[0102] (3) Examples 13 to 24 and Comparative Examples 15 to 19 Laminates of Examples 13 to 24 and Comparative Examples 15 to 19 were produced in the same manner as Example 10, except that fluorine-based additives R-40, R-43, F-447, and F-556 (manufactured by DIC) were added to the composition for forming the photorefractive layer in the contents shown in Table 5 below to adjust the surface energy.

[0103] (4) Examples 25 to 45 Laminates of Examples 25 to 45 were produced in the same manner as Example 8, except that the thicknesses of the photorefractive layer and the color conversion ink layer were adjusted as shown in Table 8 below.

[0104] [Table 4]

[0105] [Table 5]

[0106] * Content of fluorine-based additive: relative to the total weight of the composition for forming the photorefractive layer - Fluorine-based additives: R-40, R-43, F-447 and F-556 (manufactured by DIC) Experimental Example (1) Measurement of luminance The luminance of the laminates according to Examples 1 to 12, 25 to 45 and Comparative Examples 1 to 14 was measured (Digital Luxmeter, manufactured by Yato). The luminance was measured based on a total of 100 pixels (10 pixels × 10 pixels), and the results are shown in Tables 6 to 8 below.

[0107] (2) Evaluation of inkjet process characteristics In the manufacturing process of the laminates according to Example 10, Examples 13 to 24, and Comparative Examples 15 to 19, the number of drops of the composition for forming the color conversion ink layer required to completely fill the color conversion ink layer (i.e., the upper surface of the photorefractive layer which is the lower layer) was measured (set at 10 pico-liters per drop), and based on the following evaluation criteria, the inkjet process characteristics were evaluated, and the results are shown in Table 9 below.

[0108] <Evaluation Criteria for Inkjet Process Characteristics> ◎: 1 to 3 drops ○: 4 to 6 drops △: 7 to 9 drops ×: 10 drops or more (3) Evaluation of Pixel Peelability For the laminates according to Example 10, Examples 13 to 24, and Comparative Examples 15 to 19, the pixel peelability was evaluated using Nichiban Tape (trade name) according to the JIS Z 1522 (or ASTM D3359) standard. Based on the following evaluation criteria with a total of 10,000 pixels (100 horizontally and 100 vertically) as the reference for the number of lost pixels, the evaluation was carried out, and the results are shown in Table 9 below.

[0109] <Evaluation Criteria for Pixel Peelability> ◎: The number of lost pixels is 1 or less ○: The number of lost pixels is 2 or more and 5 or less △: The number of lost pixels is 6 or more and 50 or less ×: The number of lost pixels exceeds 50

[0110]

Table 6

[0111]

Table 7

[0112]

Table 8

[0113]

Table 9

[0114] Referring to Tables 6 and 7 above, all of the laminates of Examples 1 to 12 in which the refractive index of the photorefractive layer is 0.3 or more smaller than that of the color conversion ink layer show excellent luminance. In particular, it can be confirmed that the laminates of Examples 7 to 12 in which white partitions formed using the partition-forming composition according to Production Example 2 show even more excellent luminance.

[0115] On the other hand, it can be confirmed that the luminance of the laminates of Comparative Examples 1 to 14 in which the difference between the refractive index of the photorefractive layer and the refractive index of the color conversion ink layer is less than 0.3 decreases significantly.

[0116] Further, referring to Table 8 above, a change in luminance due to a change in the film thickness of the photorefractive layer can be confirmed. That is, when the film thickness of the photorefractive layer is 1.0 μm or less, it can be confirmed that the luminance improves. In particular, when the photorefractive layer has a film thickness of 0.1 to 0.3 μm, the highest luminance improvement effect can be confirmed.

[0117] On the other hand, Examples 35 to 45 show results in which the luminance decreases as the thickness of the color conversion ink layer becomes thinner to 5 μm. However, a change in luminance according to the thickness of the photorefractive layer can still be confirmed. In particular, when the photorefractive layer has a film thickness of 0.1 to 0.3 μm, the highest luminance improvement effect can be confirmed.

[0118] Further, referring to Table 9 above, the laminates of Examples 10, 13 to 24 in which the surface energy of the photorefractive layer satisfies the range of 24.9 to 43.3 dyne / cm show excellent effects in both the evaluation of inkjet process characteristics and pixel peelability. In particular, it can be confirmed that the laminates of Examples 16 to 22 in which the surface energy of the photorefractive layer satisfies the range of 28.8 to 35.5 dyne / cm show even more excellent inkjet process characteristics.

[0119] On the other hand, it can be confirmed that the laminates of Comparative Examples 15 to 19, in which the surface energy of the photorefractive layer is less than 24.9 dyne / cm, show a significant decrease in the evaluation results of the inkjet process characteristics and pixel peelability.

[0120] In this regard, FIG. 6 is a photograph evaluating the inkjet process characteristics for Example 20 of the present application, and it can be confirmed that the upper surface of the photorefractive layer, which is the lower layer, is completely filled with two drops of the composition for forming the color conversion ink layer.

[0121] On the other hand, FIG. 7 is a photograph evaluating the inkjet process characteristics for Comparative Example 18 of the present application, and it can be confirmed that even eight drops of the composition for forming the color conversion ink layer do not fill more than half of the upper surface of the photorefractive layer, which is the lower layer.

[0122] In this regard, FIG. 8 is a photograph evaluating the pixel peelability for Comparative Example 16 of the present application, and a portion where lost pixels exist can be confirmed. When the pixel portion is lost in this way, there is a problem in that it causes pixel defects in the image display device, and an additional process of forming the pixel portion again through a repair process is required.

Claims

1. A substrate; A light source formed on the substrate; A photorefractive layer formed on the light source; and A color conversion ink layer formed on the photorefractive layer, The refractive index of the photorefractive layer is at least 0.3 smaller than the refractive index of the color conversion ink layer, The refractive index difference (first refractive index difference) between the photorefractive layer and the color conversion ink layer is larger than the refractive index difference (second refractive index difference) between the topmost layer of the light source and the photorefractive layer, The second refractive index difference is 0.01 to 0.16, laminate.

2. The photorefractive layer has a refractive index of 1.33 to 1.5, the laminate according to claim 1.

3. The photorefractive layer has a film thickness of 1.0 μm or less, the laminate according to claim 1.

4. The color conversion ink layer has a refractive index of 1.8 to 2.0, the laminate according to claim 1.

5. The topmost layer of the light source has a refractive index of 1.45 to 1.55, the laminate according to claim 1.

6. The photorefractive layer has a surface energy of 24.9 to 43.3 dyne / cm, the laminate according to claim 1.

7. The thickness of the color conversion ink layer is 5 to 15 μm, the laminate according to claim 1.

8. The photorefractive layer is formed from a composition for forming a photorefractive layer containing scattering particles, the laminate according to claim 1.

9. The scattering particles are hollow particles, the laminate according to claim 8.

10. Further comprising a partition formed so as to have an opening exposing the light source on the substrate, the laminate according to claim 1.

11. The laminate according to claim 10, wherein the partition wall is formed from a partition wall forming composition containing a colorant, a binder resin, a photopolymerizable monomer, a photopolymerization initiator, and a solvent.

12. The laminate according to claim 11, wherein the partition wall forming composition further contains a liquid repellent.

13. A step of forming a light source on a substrate; A step of forming a photorefractive layer on the light source; and A step of forming a color conversion ink layer on the photorefractive layer, wherein the refractive index of the photorefractive layer is at least 0.3 smaller than the refractive index of the color conversion ink layer, and the refractive index difference (first refractive index difference) between the photorefractive layer and the color conversion ink layer is larger than the refractive index difference (second refractive index difference) between the uppermost layer of the light source and the photorefractive layer, wherein the second refractive index difference is from 0.01 to 0.16, a method for manufacturing a laminate.

14. After the step of forming a light source on the substrate, The method for manufacturing a laminate according to claim 13, further comprising a step of forming a partition wall having an opening for exposing the light source on the substrate.

15. An image display device including the laminate according to claim 1.

Images