WO2014073893A1

WO2014073893A1 - Nanocomposite, and optical member and backlight unit comprising same

Info

Publication number: WO2014073893A1
Application number: PCT/KR2013/010092
Authority: WO
Inventors: 최정옥; 권오관; 김병철
Original assignee: 주식회사 엘엠에스
Priority date: 2012-11-09
Filing date: 2013-11-07
Publication date: 2014-05-15

Abstract

Disclosed is a nanocomposite. The nanocomposite comprises a wax particle, at least one nano light-emitting body positioned inside the wax particle, and a silicon oxide protective film for covering the nano light-emitting body. The nanocomposite can improve light stability and heat/moisture stability of the nano light-emitting body.

Description

Nanocomposite, Optical member and backlight unit including same

The present invention relates to a nanocomposite, an optical member and a backlight unit including the same.

Nano light emitters, including quantum dots, are materials with crystal structures ranging in size from tens to tens of nanometers and are composed of hundreds to thousands of atoms. Even if the nano light emitting material is formed of the same material as the size is smaller the band gap (band gap) becomes larger, the light emission characteristics vary depending on the size of the nano light emitting material. In addition, even if the nano-luminescent body of the same size, the light emission characteristics vary depending on the material to be formed. The characteristics of the nano light-emitting body are controlled and used in various light emitting devices and electronic devices.

However, since the nano light emitter is very vulnerable to ultraviolet rays, heat, moisture, etc., when the nano light emitter is applied to an electronic device, there is a problem that the life of the electronic device is shortened. In order to solve this problem, a method of protecting the nano light emitting material in the thin film from UV, heat, and moisture by forming a protective layer on the upper and lower portions of the thin film including the nano light emitting material, respectively, has been proposed. There is a limit to blocking.

On the other hand, the display device generally uses a white light source that emits white light. As the white light passes through the color filter, a user who observes the display device may see a color image. The white light source includes a blue light emitting diode chip (LED) emitting blue light and a light converting body which finally emits white light by using blue light. YAG (Yttrium Aluminum Garnet), which is a phosphor, is mainly used as the light conversion body. However, since the phosphor has a wide range of emission spectrum over the red light wavelength band and the green light wavelength band, there is a limit in increasing the color purity of the color of the light generated by the white light source using the phosphor passing through the color filter. There is a problem of lowering the color reproducibility of the device.

In order to improve color reproducibility of a display device, various studies have recently been conducted to apply a nano light-emitting body having a light emission spectrum having a narrow full width at half maximum (FWHM) and a high power density to a display device.

The technical problem of the present invention was conceived in this respect, and an object of the present invention is to provide a nanocomposite capable of improving the stability of ultraviolet light, heat, moisture, etc. of the nano light-emitting body.

Another object of the present invention is to provide an optical member, a diffusion sheet and a light collecting sheet to which the nanocomposite is applied.

Still another object of the present invention is to provide a backlight unit to which at least one of the optical member, the diffusion sheet, and the light collecting sheet is applied.

Nanocomposite according to an embodiment of the present invention comprises a wax particle, at least one nano light-emitting body and the inner protective film. The nano light emitter is disposed inside the wax particle. The inner protective layer covers the nano light-emitting body and is formed of silicon oxide.

In one embodiment, the inner passivation layer may cover one nano light-emitting body. In contrast, the inner passivation layer may cover two or more nano light-emitting bodies.

In one embodiment, the nanocomposite may further include an outer protective film. The outer protective film may cover the surface of the wax particles and be formed of silicon oxide. In this case, the nanocomposite may further include a wax layer formed on the surface of the outer protective layer and formed of a wax-based compound.

Nanocomposite according to another embodiment of the present invention comprises a wax particle, at least one nano light-emitting body and an outer protective film. The nanocomposite is disposed inside the wax particles. The outer protective film covers the surface of the wax particles and is formed of silicon oxide.

In one embodiment, the nanocomposite may further include a wax layer formed on a surface of the outer protective layer and including a wax-based compound.

An optical member according to an embodiment of the present invention includes a base substrate and a first optical layer disposed on one surface of the base substrate and having at least one nanocomposite dispersed therein. The first nanocomposite includes a first wax particle and at least one first nano light-emitting body disposed inside the first wax particle.

In one embodiment, the optical member may further include a light diffusion layer formed on the first optical layer. In this case, a light diffusion pattern may be formed on the surface of the light diffusion layer.

In one embodiment, the optical member may further include a second optical layer disposed on the other surface of the base substrate facing the one surface and at least one second nanocomposite is dispersed. In this case, the second nanocomposite may include a second wax particle and at least one second nano light-emitting body disposed inside the second wax particle. In this case, the optical member may further include a light diffusion layer formed on the second optical layer, and a light diffusion pattern may be formed on a surface of the light diffusion layer.

In an embodiment, the optical member may further include a third optical layer disposed on the first optical layer and having at least one third nanocomposite dispersed therein. In this case, the third nanocomposite may include a third wax particle and at least one third nano light emitter disposed in the third wax particle.

In one embodiment, at least one of the first to third nanocomposites may further include an inner protective film or an outer protective film formed of silicon oxide. The inner passivation layer may cover the surface of any one of the first to third nano light-emitting bodies, and the outer passivation layer may cover the surface of any one of the first to third wax particles. When any one of the first to third nanocomposites includes the outer protective layer, a wax layer formed of a wax-based compound may cover the surface of the outer protective layer.

In one embodiment, at least one of the first to third optical layers may include an optical pattern formed on the surface thereof.

The diffusion sheet according to another embodiment of the present invention includes a base substrate and a first optical layer disposed on one surface of the base substrate, at least one nanocomposite is dispersed, and a light diffusion pattern formed on a surface thereof. The first nanocomposite includes a first wax particle and at least one first nano light-emitting body disposed inside the first wax particle.

In one embodiment, the diffusion sheet may further include a second optical layer disposed on the other surface facing the one surface and including at least one second nanocomposite. The second nanocomposite may include a second wax particle and at least one nano light emitter disposed inside the second wax particle. In this case, a light diffusion pattern may be formed on the surface of the second optical layer.

In one embodiment, the diffusion sheet may further include an intermediate layer disposed between the base substrate and the second optical layer or between the base substrate and the first optical layer. In this case, the intermediate layer may include at least one third nanocomposite, and the third nanocomposite may include a third wax particle and at least one nano light emitter disposed inside the third wax particle.

In one embodiment, the diffusion sheet may further include a second optical layer disposed on the other surface of the base substrate facing the one surface and the light collecting pattern is formed on the surface.

A diffusion sheet according to another embodiment of the present invention includes a base substrate, a light diffusion layer formed on one surface of the base substrate, and at least one first nanocomposite formed on the other surface of the base substrate facing the one surface. It includes a first optical layer. The first nanocomposite includes a first wax particle and at least one first nano light-emitting body disposed inside the first wax particle.

In one embodiment, the diffusion sheet may further include a second optical layer disposed on the first optical layer and including at least one second nanocomposite. In this case, the second nanocomposite may include a second wax particle and at least one second nano light-emitting body disposed inside the second wax particle.

In one embodiment, the diffusion sheet may further include a light diffusion layer formed on the first optical layer.

The light collecting sheet according to the embodiment of the present invention includes a light collecting pattern including a base substrate and a nanocomposite including at least one nano light emitter disposed on the base substrate and disposed inside the wax particle.

The light collecting sheet according to another embodiment of the present invention is an optical layer including a base substrate, a light collecting pattern disposed on one surface of the base substrate and the other surface of the base substrate facing the one surface, and including a nanocomposite. It includes. In this case, the nanocomposite includes wax particles and at least one nano light-emitting body disposed inside the wax particles.

In one embodiment, a light diffusion pattern may be formed on the surface of the optical layer.

The backlight unit according to an embodiment of the present invention includes a light source, a diffusion sheet, and a light collecting sheet, and at least one of the diffusion sheet and the light collecting sheet includes wax particles and at least one nano light emitter disposed inside the wax particles. At least one nanocomposite is included.

In one embodiment, the light source may include a blue light emitting module.

In the nanocomposite according to the present invention, since the nano light-emitting body is protected by a wax-based compound or silicon oxide, the light stability and the moisture / thermal stability of the nano light-emitting body can be significantly improved.

According to the optical member and the backlight unit according to the present invention, not only the color reproduction area of the display device can be increased by using the nanocomposite but also the color purity and color reproducibility of the color displayed by the display device can be improved.

1A to 1C are diagrams for explaining a nanocomposite according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining the nano light-emitting body shown in FIGS. 1A to 1C.

3A to 3C are diagrams for explaining a nanocomposite according to another embodiment of the present invention.

4A and 4B are diagrams for describing an optical member according to an exemplary embodiment of the present invention.

4C to 4G are diagrams for describing various types of optical patterns.

5A to 5I are views for explaining embodiments of the diffusion sheet according to the present invention.

6a to 6d are views for explaining embodiments of the light collecting sheet according to the present invention.

7A to 7C are diagrams for describing embodiments of the light guide plate according to the present invention.

8 and 9 are diagrams for describing a backlight unit according to an exemplary embodiment of the present invention.

10 is an image for describing a color reproduction area of a display device including a backlight unit according to Comparative Example 1. FIG.

11A to 11F are images for describing a color reproduction area of display devices including the backlight units according to the first to sixth embodiments.

12 is a diagram for explaining nine points of color coordinate uniformity evaluation experiments.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific form disclosed, it is to be understood that the present invention includes all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In the accompanying drawings, the dimensions of the structures are shown to be enlarged or reduced than actual for clarity of the invention.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, the terms "comprise", "comprise" or "have" are intended to indicate that there is a feature, step, operation, component, part, or combination thereof described on the specification, and one or the same. It is to be understood that the present invention does not exclude in advance the possibility of the presence or the addition of other features, steps, operations, components, parts or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

In the present invention, the wax-based compound refers to an organic compound having a melting point (melting point) higher than room temperature in a solid state at room temperature, and the wax particles are formed by physical recrystallization of the wax-based compound and are physically monolithic. It refers to the particles of the amorphous or amorphous form. Here, room temperature means a temperature within the range of about 15 ℃ to about 25 ℃. In addition, in the present invention, luminescence refers to the difference between the ground state and the excited state as the electrons in the material transition from the ground state to the excited state by the external stimulus and fall back to the stable ground state. It means a phenomenon of emitting light corresponding to the difference in energy.

In addition, in the present invention, the blue nanocomposite means a nanocomposite in which the nano light emitter is composed of only the blue nano light emitter. In addition, the green nanocomposite means a nanocomposite in which the nano light emitter is composed of only green nano light emitter, and the red nanocomposite means a nanocomposite in which the nano light emitter is composed only of red nano light emitter.

In addition, in the present invention, the multi-color nanocomposite means a nanocomposite in which the nano light emitter is composed of at least two nano light emitters selected from blue, green and red nano light emitters.

Blue nano emitters collectively refer to nano emitters having emission peaks in the blue wavelength range of about 430 nm to about 470 nm, and green nano emitters collectively refer to nano emitters having emission peaks in the green wavelength range of about 520 nm to about 560 nm. Red nano light emitter is a generic term for nano light emitters having emission peaks in the red wavelength range of about 600 nm to about 660 nm.

나노 복합체Nanocomposite

1A to 1C are views for explaining a nanocomposite according to one embodiment of the present invention, and FIG. 2 is a view for explaining the nano light-emitting body shown in FIGS. 1A to 1C.

1A and 2, a nanocomposite 100a according to an embodiment of the present invention includes wax particles 110 and at least one nano light emitter 120 disposed inside the wax particles 110. do.

The wax particles 110 are made of a wax-based compound. The wax particles 110 may encapsulate the nano light emitter 120 to prevent the nano light emitter 120 from being damaged by moisture, heat, or light caused by an external environment. In addition, as the nano light emitter 120 is positioned inside the wax particle 110, the wax particles 110 are stable to a resin for forming the nano light emitter 120 as a base substrate or an optical coating layer of an optical member. Can be dispersed.

In the present invention, encapsulation means that the nano light emitter 120 is disposed inside the wax particle 110, and the nano light emitter 120 is surrounded by the wax particle 110. In this case, a van der Waals force may act between the nano light emitter 120 and the wax particle 110.

The wax-based compound constituting the wax particles 110 may be a synthetic wax in the form of a polymer, a copolymer, or an oligomer. For example, the wax-based compound may be polyethylene-based wax, polypropylene-based wax, or amide-based wax.

As one embodiment, when the wax compound is a polyethylene wax or a polypropylene wax, the wax compound may include at least one of units represented by the following Chemical Formulas 1 to 7.

[Formula 1]

[Formula 2]

[Formula 3]

[Formula 4]

[Formula 5]

[Formula 6]

[Formula 7]

In Formulas 1 to 7, R ₁ , R ₃ , R ₅ and R ₇ are each independently a single bond or an alkylene group having 1 to 10 carbon atoms (*-(CH 2) _x- *, x is an integer of 1 to 10 R ₂ , R ₄ , R ₆ and R ₈ may be each independently hydrogen or an alkyl group having 1 to 10 carbon atoms, and R _a , R _b , R _c , R _d , R _e , R _f and R _g may be each independently hydrogen or an alkyl group having 1 to 3 carbon atoms.

In an embodiment, when R ₂ in Formula 1 is hydrogen, the unit of Formula 1 may include a carboxyl group. Alternatively, when R ₂ in Formula 1 is an alkyl group having 1 to 10 carbon atoms, Formula 1 The unit of may include an ester group. In addition, when R ₄ of Formula 2 is hydrogen, the unit of Formula 2 may include an aldehyde group. Alternatively, when R ₄ of Formula 2 is an alkyl group having 1 to 10 carbon atoms, the unit of Formula 2 is It may include a ketone group. In addition, when R ₆ of Formula 3 is hydrogen, the monomer of Formula 3 may include a hydroxy group, otherwise, when R ₆ of Formula 3 is an alkyl group having 1 to 10 carbon atoms, the unit of Formula 3 May include an ether group.

When R _a , R _b , R _c , R _d , R _e , R _f and R _g of Formulas 1 to 7 are all hydrogen, the wax-based compound may be a polyethylene wax. For example, the polyethylene wax may be a polyethylene wax (PE wax) including only a unit in which R _g of Formula 7 is hydrogen. On the contrary, the polyethylene wax contains oxygen in which R _a , R _b , R _c , R _d , R _e and R _f in Formulas 1 to 6 are hydrogen as well as units in which R _g in Formula 7 is hydrogen. It may be a polyethylene wax further comprising at least one of the units. Examples of the polyethylene wax including at least one oxygen-containing unit include oxidized polyethylene wax (PE wax), an ethylene-acrylic acid copolymer, and ethylene-vinyl, which are oxides of polyethylene. Ethylene-vinyl acetate copolymer, ethylene-maleic anhydride copolymer, and the like.

In addition, when R _a , R _b , R _c , R _d , R _e , R _f and R _g of Formulas 1 to 7 are each independently a methyl group having 1 carbon atom, the wax-based compound may be a polypropylene wax. Can be. For example, the polypropylene wax may be a polypropylene wax (PP wax) including only a unit in which R _g of Formula 7 is a methyl group. On the contrary, the polypropylene wax contains oxygen in which R _a , R _b , R _c , R _d , R _e and R _f of Formulas 1 to 6 are hydrogen as well as units in which R _g of Formula 2 is a methyl group. It may be a polypropylene wax further comprising at least one of the units. Examples of polypropylene waxes containing oxygen-containing units include propylene-maleic anhydride copolymers and the like.

In another embodiment, when the wax-based compound is an amide wax, the wax-based compound may be a polymer, copolymer or oligomer whose main chain includes an amide bond (-CONH-). The amide wax may include a unit having 1 to 10 carbon atoms. The amide wax may further include one or more of oxygen-containing units represented by Chemical Formulas 1 to 6.

When the wax-based compound includes at least one oxygen-containing unit of the units of Chemical Formulas 1 to 6, the wax particles 110 may form the nano light emitter 120 as compared with the case of including only the units of Chemical Formula 7. Can be encapsulated more stably. This is because when the wax-based compound includes an oxygen-containing unit, the interaction between the wax particles 110 and the metal constituting the nano light-emitting body 120 by the polarity of oxygen contained in the oxygen-containing unit. This is because the interaction becomes stronger.

In the case where the wax-based compound includes the unit represented by Chemical Formula 1, particularly a carboxyl group, the interaction between the wax particle 110 and the nano light-emitting body 120 may be stronger. 110 is more advantageous for encapsulating the nano light emitter 120. Therefore, in one embodiment of the present invention, the wax particles 110 is preferably made of a wax-based compound containing at least a carboxy group as a substituent.

The wax-based compound constituting the wax particles 110 may have an acid value of about 1 mg KOH / g to about 200 mg KOH / g. In the present invention, the acid value of the wax compound refers to the number of mg of potassium hydroxide (KOH) required to neutralize 1 g of the wax compound. The greater the acid value of the wax-based compound may be a greater amount of carboxyl groups contained in the wax-based compound. When the acid value of the wax-based compound is less than about 1 mg KOH / g, the amount of carboxyl groups interacting with the nano light emitter 120 is very small, which may cause a problem that the nano light emitter 120 cannot be encapsulated stably. have. In addition, when the acid value of the wax-based compound exceeds about 200 mg KOH / g, there may be a problem that the surface of the nano light emitting body 120 is oxidized by the carboxy group. In an embodiment, the wax-based compound constituting the wax particles 110 may have an acid value of about 5 mg KOH / g to about 50 mg KOH / g in order to stably encapsulate the nano light emitter 120.

The wax particles 110 may be made of a wax-based compound having a high density of about 0.95 g / cm ³ or more. Since the high density wax compound having a high density of about 0.95 g / cm ³ or more has a higher melting point than the low density wax compound having a low density of less than about 0.95 g / cm ³ , the wax particles composed of the high density wax compound (110) Heat resistance of the nanocomposite 100a including) may be improved. In addition, since the high-density wax-based compound has better crystallinity than the low-density wax-based compound upon recrystallization, the wax particles 110 made of the high-density wax-based compound may more stably encapsulate the nano light-emitting body 120. .

One as a specific example, polyethylene (PE) wax is from about 0.95 g / cm high-density PE wax having ^three or more density (high density PE wax, HDPE wax) and low density PE wax having a density of less than about 0.95 g / cm ³ ( low density PE wax, LDPE wax), and the wax particles 110 may be formed of HDPE wax. The density of the HDPE wax may be about 1.20 g / cm ³ or less, in which case the melting point of the HDPE wax may be about 120 ° C. to about 200 ° C. In contrast, the melting point of LDPE wax may be from about 80 ° C to about 110 ° C. Therefore, the wax particles 110 may further improve the heat resistance of the nanocomposite 100a according to the embodiment of the present invention rather than being formed of HDPE wax.

The wax particle 110 may be formed of a wax-based compound having a weight-average molecular weight of about 1,000 to 20,000. In this invention, a weight average molecular weight means the average molecular weight obtained by averaging the molecular weight of the molecular weight of the component molecular species of a high molecular compound with molecular weight distribution. When the weight average molecular weight of the wax-based compound is less than about 1,000, since the wax-based compound is hard to exist in a solid state at room temperature, it may be difficult to encapsulate the nano light-emitting body 120 at room temperature. In addition, when the weight average molecular weight of the wax compound exceeds about 20,000, since the recrystallization size (average diameter) of the wax compound is several hundred μm or more, it is difficult to disperse it in a solvent or a resin even when a composite is prepared using the Problems may arise. In addition, when the molecular weight of the wax-based compound exceeds about 20,000, the wax-based compound has a melting point of about 200 ℃ or more, so that the nano light-emitting body 120 in the process of encapsulating the nano light-emitting body 120 Can be damaged.

As the nano light emitter 120, a known nano light emitter may be used without limitation. For example, as shown in FIG. 2, the nano light emitter 120 may include a central particle 121 and a ligand 123 bound to a surface of the central particle 121.

The central particle 121 may be formed of a II-VI compound, a II-V compound, a III-V compound, a III-IV compound, a III-VI compound, a IV-VI compound, or a mixture thereof. . The mixture includes not only a mixed mixture, but also a ternary compound, a tetracomponent compound, and a case where a dopant is doped into the mixture.

Examples of group II-VI compounds include magnesium sulfide (MgS), magnesium selenide (MgSe), magnesium telluride (MgTe), calcium sulfide (CaS), calcium selenide (CaSe), calcium telluride (CaTe), and strontium sulfide (SrS), strontium selenide (SrSe), strontium telluride (SrTe), cadmium sulfide (CdS), cadmium selenide (CdSe), tellurium cadmium (CdTe), zinc sulfide (ZnS), zinc selenide (ZnSe), Zinc telluride (ZnTe), mercury sulfide (HgS), mercury selenide (HgSe), mercury telluride (HgTe), and the like.

Examples of Group II-V compounds include zinc phosphide (Zn ₃ P ₂ ), zinc arsenide (Zn ₃ As ₂ ), cadmium phosphide (Cd ₃ P ₂ ), cadmium arsenide (Cd ₃ As ₂ ), and cadmium nitride (Cd ₃ N ₂ ) or zinc nitride (Zn ₃ N ₂ ).

Examples of group III-V compounds include boron phosphide (BP), aluminum phosphide (AlP), aluminum arsenide (AlAs), aluminum antimonide (AlSb), gallium nitride (GaN), gallium phosphide (GaP), and gallium arsenide (GaAs), gallium monoxide (GaSb), indium nitride (InN), indium phosphide (InP), indium arsenide (InAs), indium antimony (InSb), aluminum nitride (AlN) or boron nitride (BN) Etc. can be mentioned.

Examples of the III-IV compound include boron carbide (B ₄ C), aluminum carbide (Al ₄ C ₃ ), gallium carbide (Ga ₄ C), and the like.

Examples of group III-VI compounds include aluminum sulfide (Al ₂ S ₃ ), aluminum selenide (Al ₂ Se ₃ ), aluminum telluride (Al ₂ Te ₃ ), gallium sulfide (Ga ₂ S ₃ ), gallium selenide ( Ga ₂ Se ₃ ), indium sulfide (In ₂ S ₃ ), indium selenide (In ₂ Se ₃ ), gallium telluride (Ga ₂ Te ₃ ), indium telluride (In ₂ Te ₃ ), and the like.

Examples of the group IV-VI compounds include lead sulfide (PbS), lead selenide (PbSe), lead telluride (PbTe), tin sulfide (SnS), tin selenide (SnSe), tin telluride (SnTe), and the like. .

For example, the center particle 121 may have a core / shell structure. Each of the core and the shell of the central particle 121 may be made of the above-described compounds. The compounds exemplified above may be used alone or in combination of two or more to constitute the core or shell. The band gap of the compound constituting the core may be narrower than the band gap of the compound constituting the shell, but is not limited thereto. However, when the center particle 121 has a core / shell structure, the compound constituting the shell is different from the compound constituting the core. For example, the central particle 121 may have a CdSe / ZnS (core / shell) structure having a core including CdSe and a shell including ZnS, or an InP / having a core including InP and a shell including ZnS. It may have a ZnS (core / shell) structure.

As another example, the center particle 121 may have a core / multishell structure having at least two layers of shells. For example, the central particle 121 has a core including CdSe, a first shell surrounding the surface of the core and including ZnSe, and a CdSe / having a second shell surrounding the surface of the first shell and including ZnS. It may have a ZnSe / ZnS (core / first shell / second shell) structure. In addition, the center particle 121 has an InP / ZnSe / ZnS (core / first shell / second shell) structure including a core including InP, ZnSe as a first shell, and ZnS as a second shell. Can have.

As another example, the central particle 121 may be made of only a II-VI compound or a III-V compound as a single structure instead of a core / shell structure.

Although not shown in the drawings, the central particle 121 may further include a cluster molecule as a seed. The cluster molecule is a compound that functions as a seed during the process of manufacturing the center particle 121, and precursors of the compound constituting the center particle 121 grow on the cluster molecule to form the center particle 121. Can be. In this case, examples of the cluster molecule include various compounds disclosed in Korean Laid-Open Publication No. 2007-0064554, and the like, but are not limited thereto.

The ligand 123 may prevent the central particles 121 adjacent to each other from aggregation and quenching. The ligand 123 may bind to the central particle 121 and have a hydrophobic property.

As an example of the said ligand 123, the amine compound, carboxylic acid compound, etc. which have a C6-C30 alkyl group are mentioned. Examples of the amine compound having an alkyl group include hexadecylamine or octylamine. As another example of the said ligand 123, an amine compound, a carboxylic acid compound, etc. which have a C6-30 alkenyl group are mentioned. Alternatively, examples of the ligand 123 may include a phosphine compound including trioctylphosphine, triphenolphosphine, t-butylphosphine, and the like; Phosphine oxides such as trioctylphosphine oxide; Pyridine or thiophene etc. are mentioned. The type of the ligand 123 is not limited to the example exemplified above, and in some cases, the nano light-emitting body 120 may be composed of only the central particle 121 without the ligand 123. The nanocomposite 100a according to the embodiment of the present invention may have various shapes, and one nanocomposite 100a may include at least one nano light emitter 120. For example, one nano light emitter 120 may be disposed in one wax particle 110, whereas two to tens of millions of nano light emitters 120 may be disposed in one wax particle 110. Can be.

For example, the plurality of nano light emitters 120 disposed inside one wax particle 110 may have emission peaks in the same wavelength range. That is, the nano light emitters 120 may include a first color nano light emitter having a light emission peak in a first wavelength band, a second color nano light emitter having a light emission peak in a second wavelength band, and a third color nano light emitting peak in a third wavelength band. It may include one selected from the light emitting body. The first color nano light emitter is a blue nano light emitter having an emission peak in a wavelength range of about 430 nm to about 470 nm, and the second color nano light emitter is a green nano light emitter having an emission peak in a wavelength range of about 520 nm to about 560 nm. The third color nano light emitter may be a red nano light emitter having an emission peak in a wavelength band of about 600 nm to about 660 nm. In this case, the nanocomposite 100a may be any one of a blue nanocomposite, a red nanocomposite, and a red nanocomposite.

As another embodiment, at least two of the plurality of nano light emitters 120 disposed inside one wax particle 110 may have emission peaks in different wavelength bands. That is, the plurality of nano light emitters 120 disposed inside one wax particle 110 may include two selected from blue nano light emitters, green nano light emitters, and red nano light emitters. For example, the green nano light emitter and the red nano light emitter may be disposed in the wax particle 110. In this case, the nanocomposite 100a may be a multicolor nanocomposite.

Meanwhile, the diameter of the nanocomposite 100a may be about 50 nm to about 30 μm. The diameter may be defined as a hydrodynamic diameter measured by the Dynamic Light Scattering method (DLS method) calculated by the Stokes-Einstein equation for the diffusion coefficient.

Referring to FIG. 1B, the nanocomposite 100b according to an embodiment of the present invention may include wax particles 110, at least one nano light emitter 120, and an outer passivation layer 130. Since the nanocomposite 100b is substantially the same as the nanocomposite 100a illustrated in FIG. 1A except that the nanocomposite 100b further includes the outer protective layer 130, detailed descriptions thereof will be omitted. The nanocomposite 100b may have a diameter of about 50 nm to about 30 μm.

The outer protective layer 130 is formed on the surface of the wax particles 110 to cover the wax particles 110. The outer passivation layer 130 is formed of silicon oxide (SiOx, 1 ≦ x ≦ 2). The outer protective layer 130, together with the wax particles 110, may prevent the nano light-emitting body 120 from being damaged by moisture, heat, or light.

The outer passivation layer 130 may be formed through hydrolysis and condensation of the silicon oxide precursor material. For example, the outer passivation layer 130 may be a mixture of wax particles 110, a silicon oxide precursor material, a catalyst material, and water having the nano light emitter 120 disposed therein in an organic solvent, on the surface of the wax particles 110. It can be formed by growing silicon oxide. In this case, the outer passivation layer 130 may include silica (SiO ₂ ).

Examples of the silicon oxide precursor material are triethoxysilane (triethoxysilane (HTEOS), tetraethoxysilane (TEOS), methyltriethoxysilane (MTEOS), dimethyldiethoxysilane (dimethyldiethoxysilane), tetramethoxysilane (tetramethoxysilane (TMOS), methyltrimethoxysilane (MTMOS), trimethoxysilane, dimethyldimethoxysilane, phenyltriethoxysilane (PTEOS), phenyltrimethoxysilane ( phenyltrimethoxysilane (PTMOS), diphenyldiethoxysilane, diphenyldimethoxysilane and the like can be used. In addition, the silicon oxide precursor material is halosilane, in particular chlorosilane, for example trichlorosilane, methyltrichlorosilane, ethyltrichlorosilane, phenyltrichloro Phenyltrichlorosilane, tetrachlorosilane, dichlorosilane, methyldichlorosilane, dimethyldichlorosilane, chlorotriethoxysilane, chlorotrimethoxysilane Chloromethyltriethoxysilane, chloroethyltriethoxysilane, chlorophenyltriethoxysilane, chlorophenyltriethoxysilane, chloromethyltrimethoxysilane, chloroethyltrimethoxysilane, Chlorophenyltrimethoxysilane (chlorop It may be synthesized using henyltrimethoxysilane, or the like, or may be synthesized using polysiloxane, polysilazane, or the like.

Examples of the organic solvent include methanol, ethanol, propanol, butanol, butanol, pentanol, hexanol, methyl cellosolve, butyl cellosolve ( Alcoholic solvents such as butyl cellosolve, propylene glycol, and diethtylene glycol, or toluene may be used. The organic solvent may be used alone or in combination of two or more thereof.

As the catalyst material, an alkaline material such as ammonia (NH ₃ ) may be used. In this case, ammonia may be used as a catalyst material in the process of forming the external protective film 130 by mixing ammonia water (NH ₄ OH) with the organic solvent.

Although not illustrated in the drawings, the outer protective layer 130 may cover the plurality of wax particles 110. For example, the outer passivation layer 130 may cover at least two wax particles 110 disposed adjacent to each other, and the space between the wax particles 110 may be filled with silicon oxide to form a nanocomposite. Can be formed. When the outer protective layer 130 covers the first wax particles and the second wax particles, the first nano light emitters disposed inside the first wax particles may be different from the second nano light emitters disposed inside the second wax particles. By having an emission peak in the same wavelength band, the nanocomposite 100b may be any one of a blue nanocomposite, a green nanocomposite, and a red nanocomposite.

On the contrary, when the outer protective layer 130 covers the first wax particles and the second wax particles, the first nano light emitter disposed inside the first wax particles may be the second nano light disposed inside the second wax particles. It may have a light emission peak in the wavelength band different from the light emitter. In this case, the nanocomposite 100b may be a multicolor nanocomposite.

As described above, the nanocomposite 100b further includes the external protective layer 130 more stably than the nanocomposite 100a described with reference to FIG. 1A. Protect from moisture, heat, light, etc.

Referring to FIG. 1C, the nanocomposite 100c according to an exemplary embodiment of the present invention includes wax particles 110, at least one nano light emitter 120, an outer protective layer 130, and a wax layer 140. Since the nanocomposite 100c is substantially the same as the nanocomposite 100b described with reference to FIG. 1B except for further including the wax layer 140, detailed descriptions thereof will be omitted. The nanocomposite 100c may have a diameter of about 50 nm to about 30 μm.

The wax layer 140 covers the surface of the outer protective layer 130. That is, the wax layer 140 surrounds the wax particles 110 coated with the outer protective layer 130. The wax layer 140 is formed of a wax-based compound. Since the wax-based compound constituting the wax layer 140 is substantially the same as that described in the wax-based compound constituting the wax particle 110, detailed descriptions thereof will be omitted.

In FIG. 1C, the wax layer 140 covers one wax particle 110 whose surface is covered by the outer passivation layer 130, but the wax layer 140 includes two or more wax particles. The field 110 may be covered. For example, referring to FIG. 1B, the outer protective layer 130 covers both the first wax particles having the first nano light emitter disposed therein and the second wax particles having the second nano light emitter disposed therein. The wax layer 140 may again cover the surface of the outer protective layer 130.

In addition, the wax layer 140 may cover at least two nanocomposites 100b illustrated in FIG. 1B. The wax-based compound constituting the wax layer 140 fills the space between the nanocomposites 100b disposed adjacent to each other, thereby filling at least two wax particles respectively covered with the outer protective layer 130 by one wax layer. 140 may cover.

The nanocomposite 100c may be any one of blue, green, and red nano light emitters according to the type of nano light emitter 120 included therein, and may be a multicolor nano light emitter.

As described above, the nanocomposite 100c described with reference to FIG. 1c further includes the wax layer 140 in comparison with the nanocomposite 100b described with reference to FIG. It can protect from moisture, heat and the like.

Referring to FIG. 3A, the nanocomposite 200a according to an embodiment of the present invention may include a wax particle 210, at least one nano light emitter 220 disposed inside the wax particle 210, and an inner protective film ( 230).

Since the wax particle 210 is substantially the same as the wax particle 110 described with reference to FIG. 1A, and the nano light emitter 220 is substantially the same as the nano light emitter 120 described with reference to FIG. 2, detailed descriptions thereof will be omitted. .

The inner passivation layer 230 covers the nano light emitter 220. The inner passivation layer 230 directly contacts the surface of the nano light emitter 220 to cover the nano light emitter 220. In this case, the nano light emitters 220 disposed in the wax particles 210 may be individually covered by the inner passivation layer 230.

That is, one nano light-emitting body 220 may be covered by one internal protective film 230. Since the inner passivation layer 230 is formed of silicon oxide, and the silicon oxide constituting the inner passivation layer 230 is substantially the same as the silicon oxide constituting the outer passivation layer 130 described with reference to FIG. 1B, detailed descriptions thereof will be omitted. do.

The plurality of nano light emitters 220 disposed inside the wax particle 210 may have emission peaks in the same wavelength band. For example, the nanocomposite 200a may be any one of blue, green, and red nanocomposites.

Alternatively, at least two of the plurality of nano light emitters 220 disposed inside the wax particle 210 may have emission peaks in different wavelength bands. That is, the nano light emitters 220 disposed in the wax particle 210 may include at least two kinds of blue nano light emitters, green nano light emitters, and red nano light emitters. For example, the nanocomposite 200a may be a multicolor nanocomposite.

Although not illustrated, the inner passivation layer 230 may cover two or more nano light emitters 220. When two or more nano light emitters 220 are covered by the inner passivation layer 230, a space between the adjacent nano light emitters 220 may be filled by silicon oxide constituting the inner passivation layer 230. have. In this case, the nano light-emitting bodies 220 coated with one inner passivation layer 230 may have emission peaks in the same wavelength band. In contrast, at least two of the nano light emitters 220 coated with one inner passivation layer 230 may have emission peaks in different wavelength bands.

Meanwhile, when two or more nano light emitters 220 covered by one inner passivation layer 230 are referred to as light emitting groups, at least two light emitting groups may be disposed in one wax particle 210. In this case, one light emitting group may be configured by the first nano light emitters, and the other light emitting group may be configured by second nano light emitters having emission peaks at wavelengths different from those of the first nano light emitter. Alternatively, each of the light emitting groups may include at least two nano light emitters having light emission peaks in different wavelength bands.

The nanocomposite 200a may have a diameter of about 50 nm to about 30 μm.

As described above, the nanocomposite 200a has a structure in which at least one nano light emitter 200 is encapsulated by a wax-based compound in a state in which the at least one nano light-emitting body 200 is firstly encapsulated by the inner protective layer 230. Therefore, the nano light emitter 220 may be prevented from being damaged from external heat, light, and moisture.

Referring to FIG. 3B, the nanocomposite 200b according to the embodiment of the present invention may include wax particles 210, at least one nano light emitter 220, an inner passivation layer 230, and an outer passivation layer 240. . Since the nanocomposite 200b is substantially the same as the nanocomposite 200a described with reference to FIG. 3A except that the nanocomposite 200b further includes the outer passivation layer 240, detailed descriptions thereof will be omitted. The nanocomposite 200b may have a diameter of about 50 nm to about 30 μm.

The outer passivation layer 240 may cover the wax particles 210 and be formed of silicon oxide. Since the outer passivation layer 240 is substantially the same as the outer passivation layer 130 described with reference to FIG. 1B, detailed descriptions thereof will be omitted. The outer passivation layer 240 may prevent the nano light emitter 220 from being damaged by moisture, heat, light, etc. together with the wax particles 210 and the inner passivation layer 230.

In FIG. 3B, the outer passivation layer 240 covers one wax particle 210, but the outer passivation layer 240 may cover the plurality of wax particles 210. For example, the outer protective layer 240 may cover at least two wax particles 210 disposed adjacent to each other, and the silicon oxide is filled in the space between the wax particles 210 to form a nanocomposite. Can be formed.

Referring to FIG. 3C, the nanocomposite 200c according to an embodiment of the present invention may include wax particles 210, at least one nano light emitter 220, an inner passivation layer 230, an outer passivation layer 240, and a wax layer 250. It may include. Since the nanocomposite 200c is substantially the same as the nanocomposite 200b described with reference to FIG. 3B except for further including the wax layer 250, detailed descriptions thereof will be omitted. The nanocomposite 200c may have a diameter of about 50 nm to about 30 μm.

The wax layer 250 may cover the outer protective layer 240. The wax layer 250 is formed of a wax-based compound. Since the wax compound constituting the wax layer 250 is substantially the same as the wax compound described with reference to FIG. 1A, detailed descriptions thereof will be omitted.

The wax layer 250 covers one wax particle 210 whose surface is covered by the outer protective film 240 as shown in FIG. 3C, or is not shown in the drawing, but the surface is covered by the outer protective film 240. A plurality of the covered wax particles 210 may be coated.

As described above, the nanocomposite 200c encapsulates the wax particles 210 into the outer protective layer 240 and the wax layer 250 so that the nano light emitter 220 may be exposed to external heat, light, moisture, or the like. Can be prevented from being damaged. In some cases, the nanocomposite 200c shown in FIG. 3C may be repeatedly laminated to the silicon oxide film and the wax layer to manufacture the nanocomposite encapsulated by the multilayer.

Hereinafter, the manufacturing method of the nanocomposites according to the present invention described above and their stability evaluation will be described in detail.

나노 복합체의 제조 -1Preparation of Nanocomposites -1

[Step 1]

After mixing 20 mg of the wax-based compound in 1 ml of toluene, the wax-based compound was dissolved by raising the temperature to about 150 ° C. to prepare a wax solution. The wax solution was mixed with a solution containing about 20 mg of CdSe-based red quantum dots (trade name: Nanodot-HE-606, QD solution, Korea) in 1 ml of toluene, and then cooled to room temperature to about 10 mg per 1 ml of toluene. A cooling solution in which particles of were dispersed was prepared. In this case, as the wax-based compound, a wax having an acid value of about 50 mg KOH / g (trade name: Licowax PED 136 wax, Clariant, Switzerland) was used as an oxidized high density polyethylene wax (Oxidized HDPE Wax). The particles dispersed in the cooling solution contained wax particles and red quantum dots trapped inside the wax particles.

[Step 2]

The cooling solution was added to a mixture of 10 ml of ethanol and 1 ml of TEOS (tetraethoxysilane, Sigma Aldrich, USA), and then additionally 2.5 ml of 30% ammonia water to form silicon oxide on the surface of the particles. The nanocomposite solution containing the complex was prepared.

[Step 3]

In the nanocomposite solution, the nanocomposite was separated by centrifugation at about 5,000 rpm for about 30 minutes using a high speed centrifuge, washed with ethanol and distilled water, and then ethanol and distilled water were removed using an evaporator. Nanocomposite 1 was prepared.

나노 복합체의 제조 -2Preparation of Nanocomposites -2

The nanocomposite solution prepared by performing the first and second steps described in Preparation of Nanocomposite Solution-1 was added to the wax solution containing the wax-based compound. By cooling to room temperature and removing toluene by an evaporator, a nanocomposite 2 in a powder state in which a wax layer was formed on a silicon oxide film surface was prepared.

나노 복합체의 제조 -3Preparation of Nanocomposites -3

After mixing 10 ml of ethanol and 1 ml of TEOS, a solution containing about 10 mg of a CdSe-based red quantum dot (trade name: Nanodot-HE-606, QD solution, Korea) was mixed in 0.5 ml of toluene, followed by additional concentration. 2.5 ml of 30% ammonia water was added to prepare a quantum dot having a silicon oxide film formed on its surface. The quantum dots were separated by centrifugation at about 5,000 rpm for about 30 minutes using a high speed centrifuge, and then washed with ethanol and distilled water.

Subsequently, after mixing 20 mg of the wax compound with 1 ml of toluene, the wax solution prepared by dissolving the wax compound by raising the temperature to about 150 ° C. was mixed with the toluene solution in which the quantum dots formed on the surface of the silicon oxide film were dispersed. After cooling to room temperature and toluene was removed using an evaporator to prepare a powder nanocomposite 3.

나노 복합체 용액의 제조 -4 Preparation of Nanocomposite Solutions -4

The nanocomposite prepared in 'Preparation of Nanocomposite Solution-3' was mixed with a solution in which 10 ml of ethanol and 1 ml of TEOS were mixed, and 2.5 ml of ammonia water having a concentration of 30% was added.

Subsequently, the nanocomposite was separated by centrifugation at about 5,000 rpm for about 30 minutes using a high speed centrifuge, and washed with ethanol and distilled water. Ethanol and distilled water were removed using an evaporator to prepare a nanocomposite 4 in powder form.

[실험 1]-자외선 안정성 및 열/수분 안정성 평가[Experiment 1]-Evaluation of UV stability and heat / moisture stability

Prepare the nanocomposites 1 to 4 in the powder state in the same manner as described above and measure the first quantum efficiency (QYT1, unit:%) using an absolute quantum efficiency meter (trade name: C9920-02, HAMAMATSU, Japan). It was. Subsequently, after irradiating ultraviolet light (UV) having a center wavelength of 365 nm for 480 hours at a radiation intensity of about 1.4 mW / cm ² , that is, under severe conditions of about 2,419.2 J / cm ² , the second quantum efficiency (QYT2, unit:% ) Was measured. The difference between the first quantum efficiency and the second quantum efficiency (ΔQY1 = QYT1-QYT2, unit:%) was calculated to evaluate ultraviolet stability for each of the nanocomposites 1 to 4. The results are shown in Table 1.

In addition, the nanocomposites 1 to 4 of the powder state were prepared and the first quantum efficiency (QYT1, unit:%) was measured, and then left in a constant temperature and humidity chamber under severe conditions of 85 ° C. and 85% relative humidity for 480 hours. Subsequently, the third quantum efficiency (QYT3, unit:%) of each of the nanocomposites 1 to 4 after being left under severe conditions was measured. The difference between the first quantum efficiency and the third quantum efficiency (ΔQY2 = QYT1-QYT3, unit:%) was calculated to evaluate thermal / moisture stability for the nanocomposites 1 to 4. The results are shown in Table 1.

Table 1

division	UV stability (△ QY1,%)	Heat / moisture stability (△ QY2,%)
Nanocomposites 1	5.5	7.3
Nanocomposite 2	6.7	5.8
Nanocomposite 3	2.8	5.9
Nanocomposite 4	3.3	4.2

Referring to Table 1, the UV stability for the nanocomposites 1 to 4 is 6.7% or less, it can be seen that the heat / moisture stability is 7.3% or less. As the stability to ultraviolet rays is better, the change in quantum efficiency (ΔQY1) due to ultraviolet irradiation under severe conditions (irradiation amount about 2,419.2 J / cm ² ) has a smaller value. The greater the stability to heat and moisture, the smaller the change in quantum efficiency (ΔQY2) due to the harsh conditions of high temperature and high humidity (temperature 85 ° C and relative humidity 85%).

Considering that the UV light stability of the nanocomposite coated with wax particles only (see FIG. 1A) is about 15% and the heat / moisture stability is about 16%, the wax particles and silicon oxide as in Nanocomposites 1 to 4 It can be seen that UV stability and heat / moisture stability of the nanocomposite including all of the films are better.

광학 부재Optical member

Referring to FIG. 4A, the optical member 501 according to the exemplary embodiment includes a base substrate 510 and a first optical layer 520 in which at least one first nanocomposite CX1 is dispersed.

The base substrate 510 may include a light incident surface on which light is incident and a light exit surface facing the light incident surface and to which incident light is emitted. The base substrate 510 is formed of a transparent material that transmits light. Examples of the transparent material include polymethylmethacrylate (PMMA) resin, polycarbonate (PC) resin, polyimide (PI) resin, polyethylene (PE) resin, polypropylene (Polypropylene, PP). ) Resin, methacryl (Methacrylic) resin, polyurethane (Ployurethane) resin, polyethylene terephthalate (polyethylene terephthalate, PET) resin and the like.

The first optical layer 520 may be formed on one surface of the base substrate 510, that is, a light incident surface or a light exit surface. The first optical layer 520 is composed of a polymer resin and the first nanocomposite CX1. The polymer resin is a main material of the first optical layer 520, and the first nanocomposite CX1 is dispersed in the polymer resin.

The first nanocomposite CX1 includes first wax particles and at least one first nano light-emitting body disposed inside the first wax particles. For example, the first nanocomposite CX1 may have a structure substantially the same as that of the nanocomposite 100a described with reference to FIG. 1A.

In addition, the first nanocomposite CX1 may include an outer protective film or the first nano light-emitting body covering the surface of the first wax particles, as described with reference to FIGS. 1B, 1C, 3A, 3B, and 3C. It may further include an inner protective film to cover. When the first nanocomposite CX1 further includes the outer protective layer, the first nanocomposite CX1 may further include a wax layer covering the outer protective layer. That is, the first nanocomposite CX1 dispersed in the first optical layer 520 may have any one of the structures of the nanocomposites described with reference to FIGS. 1A to 1C and 3A to 3C. Therefore, detailed overlapping description of the nanocomposite CX1 will be omitted.

For example, the first nanocomposites CX1 dispersed in the first optical layer 520 may include only one selected from blue, green, and red nanocomposites. In this case, the light passing through the first optical layer 520 may have an emission spectrum only in any one of blue, green, and red wavelength bands.

As another example, the first nanocomposites CX1 dispersed in the first optical layer 520 may include at least two of blue, green, and red nanocomposites. That is, the first nanocomposites CX1 dispersed in the first optical layer 520 may be composed of a plurality of green nanocomposites and a plurality of red nanocomposites.

As another example, the first nanocomposites CX1 dispersed in the first optical layer 520 may include multicolor nanocomposites. Each of the multicolor nanocomposites is the first nano light emitter disposed inside the first wax particle, and may include at least two selected from blue, green, and red nano light emitters. For example, the multicolor nanocomposite may include a green nano light emitter and a red nano light emitter.

The first optical layer 520 may include an optical pattern formed on the surface. The shape of the optical pattern may be variously adjusted according to the function of the optical member 501. The optical pattern may include a light diffusion pattern, a light collecting pattern, a light exit pattern, and the like. The shape of the optical pattern will be described later with reference to FIGS. 4C to 4G.

Although not shown in the drawings, the first optical layer 520 may further include diffusion beads to diffuse light. The type of the diffusion beads is not particularly limited and may be used without limitation as long as it is commonly used in the art.

Alternatively, an optical layer including the diffusion beads may be formed on the base substrate 510 as a layer separate from the first optical layer 520. The optical layer including the diffusion beads may be formed on one surface or the other surface of the base substrate 510 on which the first optical layer 520 is formed.

Referring to FIG. 4B, an optical member 502 according to another embodiment of the present invention includes a base substrate 510, a first optical layer 520, and a second optical layer 530. The first optical layer 520 includes first nanocomposites CX1, and the second optical layer 530 includes second nanocomposites CX2. Each of the first nanocomposites CX1 includes a first wax particle and at least one first nano light emitter, and each of the second nanocomposites CX2 includes a second wax particle and at least one second nano light emitter. It includes.

The optical member 502 described in FIG. 4B is substantially the same as the optical member 501 described in FIG. 4A, except that the optical member 502 further includes the second optical layer 530. do.

The second optical layer 530 is formed on the other surface of the base substrate 510 on which the first optical layer 520 is formed. The second optical layer 530 includes a polymer resin and the second nanocomposites CX2 dispersed in the polymer resin.

In each of the second nanocomposites CX2, the second wax particles are formed of a wax-based compound. At least one second nano light-emitting body is disposed inside the second wax particle. Since the second nanocomposites CX2 are substantially the same as the first nanocomposite CX1 described with reference to FIG. 4A, detailed descriptions thereof will be omitted.

For example, when the first nanocomposites CX1 all have emission peaks in the same wavelength band, and the second nanocomposites CX2 all have emission peaks in the same wavelength band, the first nano light emitter and the second The nano light emitter may have an emission peak in different wavelength bands.

When the wavelength of the light generated in the first nanocomposites CX1 is shorter than the wavelength of the light generated in the second nanocomposites CX2, a portion of the light generated in the first nanocomposites CX1 may be partially formed. Since the second nano light emitters included in the 2 nanocomposites CX2 are excited, the second nanocomposites CX2 are generated from the first nanocomposites CX1 as well as light provided by a light source. It can be excited by some of the light being. That is, the second nanocomposites CX2 may be provided with sufficient light to be excited from the first nanocomposites CX1 and the light source. In addition, as the light generated by the light source first reaches the first optical layer 520, the first nanocomposites CX1 transmit higher energy from the light source than the second optical layer 530. The power density of the light generated in the first nanocomposites CX1 may be maximized.

For example, when the path of the light is in a direction from the first optical layer 520 toward the second optical layer 530, the first nanocomposites CX1 may be formed of green nanocomposites. The second nanocomposites CX2 may be formed of red nanocomposites.

As another example, the first nanocomposites CX1 may include at least two nanocomposites, and the second nanocomposites CX2 may include one nanocomposite. For example, the first nanocomposites CX1 may be composed of green nanocomposites and red nanocomposites, and the second nanocomposites CX2 may include green nanocomposites.

As another example, the first nanocomposites CX1 and / or the second nanocomposites CX2 may include multicolor nanocomposites. For example, each of the multicolor nanocomposites may include a green nano light emitter and a red nano light emitter.

Each of the first optical layer 520 and the second optical layer 530 is shown as a flat surface in FIGS. 4A and 4B, but at least one of the first and second

optical layers

520 and 530 is shown. Either one may include an optical pattern formed on the surface. The optical pattern may be variously formed according to the optical characteristics that the

optical members

501 and 502 intend to control. The shape of the said optical pattern is demonstrated below.

Although not shown in the drawings, the optical sheet 502 may further include a third optical layer including a third nanocomposite.

The third optical layer may be formed on the first optical layer 520. When the third optical layer is formed on the first optical layer 520, an optical pattern may be formed on the surface of the third optical layer.

The third nanocomposite includes a third wax particle and at least one third nano light emitter disposed inside the third wax particle. The third nanocomposite may have any one of the structures described with reference to FIGS. 1A to 1C and 3A to 3C. That is, the third nanocomposite may further include an inner passivation layer and / or an outer passivation layer. When the third nanocomposite includes an outer passivation layer, the third nanocomposite may further include a wax layer covering the outer passivation layer.

Meanwhile, when the optical sheet 502 further includes the third optical layer, the second optical layer 530 may be omitted.

4C to 4G are diagrams for describing various types of optical patterns.

Referring to FIG. 4C together with FIG. 4B, the optical pattern formed on the surface of the first optical layer 520 may be a continuous pattern 520a. The continuous pattern 520a may have a shape in which a plurality of convex portions are continuously connected. Each of the convex portions protrudes from the base substrate 510 in a direction toward the outside of the optical member 502. The heights or widths of the convex portions may be different from each other, and may have irregular values. Although not shown in the drawings, the optical pattern formed on the surface of the first optical layer 520 may have a shape in which a plurality of recesses are continuously connected. Each of the recesses is recessed in a direction from the surface of the optical member 502 toward the interior of the optical member 502. The depth or width of the recesses may be appropriately adjusted as needed and the depth or width of each of the recesses may have an irregular value. The continuous pattern 520a may have a combination of a concave portion and a convex portion, or may be an embossed pattern. The continuous pattern 520a may be used as a light diffusion pattern.

Alternatively, the continuous pattern 520a may include a plurality of divided regions as shown in FIG. 4D. 4D is a plan view illustrating a divided region. Referring to this, the continuous pattern 520a may include a convex portion formed to correspond to each of a plurality of divided regions that are irregularly arranged in a planar shape. The height, planar shape and surface area of the convex portion are not particularly limited, and the height or surface area of the convex portion may have an irregular value. Although not illustrated in the drawing, the continuous pattern 520a may include a concave portion formed corresponding to each of a plurality of divided regions irregularly arranged in a plane.

Referring to FIG. 4E, the optical pattern formed on the surface of the first optical layer 520 may be a discontinuous convex pattern 520b. In the discontinuous convex pattern 520b, each convex portion may have a form in which the convex portions are spaced apart from each other. The convex portions constituting the discontinuous convex pattern 520b may have a dot shape when viewed in a plan view. The height or width of each convex portion may be different from each other, and may have an irregular value.

Referring to FIG. 4F, the optical pattern formed on the surface of the first optical layer 520 may be a discontinuous concave pattern 520c. In the discontinuous concave pattern 520c, the concave portions may be spaced apart from each other. In this case, the unit constituting the discontinuous concave pattern 520c may have a dot shape when viewed in a plan view. The depth or width of the recesses may be different from each other and the depth or width of each recess may have an irregular value.

Referring to FIG. 4G, the optical pattern formed on the surface of the first optical layer 520 may be a light collecting pattern 520d. The condensing pattern 520d may include a plurality of protrusions, and each of the protrusions may have a triangle. The protrusions may be continuously arranged along the in-plane direction (first direction) of the cut plane defining the cross section of the triangle. For example, each of the protrusions may extend to have a constant height in a direction perpendicular to the cross section (second direction). That is, each of the protrusions may have a triangular prism shape. In contrast, the height of each of the protrusions may vary along the second direction. In this case, the height of the protrusion may vary linearly or nonlinearly along the second direction. Furthermore, the height of the protrusions may be changed to have a predetermined period but may be changed irregularly. The height of each protrusion can be changed independently of each other. The vertex angle of each protrusion constituting the condensing pattern may be about 90 °, but may be appropriately adjusted as necessary. When the height of the protrusion changes along the second direction, the vertex angle may vary depending on the position.

In FIGS. 4C to 4F, various shapes of the optical pattern formed on the first optical layer 520 have been described, but the same may be applied to the optical pattern formed on the second optical layer 530. When an optical pattern is formed on each of the first and second

optical layers

520 and 530, the optical pattern formed on the first optical layer 520 and the optical pattern formed on the second optical layer 530 are mutually different. It may be the same pattern or different patterns.

Although not shown in the drawings, each of the

optical members

501 and 502 described with reference to FIGS. 4A and 4B has a light diffusion layer formed on the surface of the optical pattern described with reference to FIGS. 4C through 4G and formed on the first optical layer 520. It may further include.

In contrast, in the optical member 501 described with reference to FIG. 4A, a light diffusing layer having the optical pattern described with reference to FIGS. 4C through 4G formed on the surface may be formed on the other surface of the base substrate 510.

As described above, a nanocomposite including nano light-emitting bodies coated with wax particles may be applied to at least one optical layer of the

optical members

501 and 502. By including the

optical members

501 and 502 in the display device, the color reproduction area of the display device can be widened, and the color purity of the color displayed by the display device can be improved. In particular, since the wax particles included in the nanocomposite protect the nano light emitter from heat, moisture, or ultraviolet light, the

optical members

501 and 502 may be heated, without a separate protective layer for protecting the optical layer including the nanocomposite. It may be stable to moisture or ultraviolet light.

The

optical members

501 and 502 may be used as a light collecting plate such as a light guide plate, a diffusion sheet, or a prism sheet, but may also be used as an optical sheet additionally inserted in addition to the general optical sheets constituting the backlight unit of the display device. .

Hereinafter, each of the diffusion sheet, the light collecting sheet, and the light guide plate to which the nanocomposite is applied will be described in detail with reference to the drawings.

Referring to FIG. 5A, an optical sheet 1001 according to an embodiment of the present invention includes a first optical layer 1200 including a base substrate 1100 and a first nanocomposite CX1.

The base substrate 1100 is formed of a transparent material. Since the transparent material is substantially the same as described with reference to FIG. 4A, detailed descriptions thereof will be omitted.

The first optical layer 1200 is formed on one surface of the base substrate 1100. The surface on which the first optical layer 1200 is formed may be a light exit surface, or may be a light incident surface.

The first nanocomposite CX1 dispersed in the first optical layer 1200 includes first wax particles and at least one first nano light emitter. The first nano light-emitting body is disposed inside the first wax particle, and the surface is covered by the first wax particle. The first nanocomposite CX1 may have any one of the structures of the nanocomposite described in FIGS. 1A to 1C and 3A to 3C.

At the same time, the first nanocomposites CX1 may include at least one of a blue nanocomposite, a green nanocomposite, and a red nanocomposite. For example, the first nanocomposites CX1 may be composed of green nanocomposites or red nanocomposites. Alternatively, the first nanocomposites CX1 may include a plurality of green nanocomposites and a plurality of red nanocomposites. In contrast, the first nanocomposites CX1 may include multicolor nanocomposites. For example, each of the multicolor nanocomposites may include a red nano emitter and a green nano emitter.

The first optical layer 1200 includes a light diffusion pattern 1210 formed on a surface thereof. Since the light diffusion pattern 1210 is substantially the same as the continuous pattern 520a described with reference to FIG. 4C, detailed descriptions thereof will not be repeated. Alternatively, the light diffusion pattern 1210 may be a discontinuous convex pattern 520b described with reference to FIG. 4E or a discontinuous concave pattern 520c described with reference to FIG. 4F.

Referring to FIG. 5B, the diffusion sheet 1002 according to another embodiment of the present invention includes a base substrate 1100, a first optical layer 1200, and a second optical layer 1300.

The first optical layer 1200 is formed on one surface of the base substrate 1100 and includes first nanocomposites CX1. The first nanocomposites CX1 include a first wax particle and at least one first nano light emitter disposed inside the first wax particle. Since the first optical layer 1200 is substantially the same as described with reference to FIG. 5A, detailed descriptions thereof will be omitted.

The second optical layer 1300 is formed on the other surface facing the one surface on which the first optical layer 1200 is formed and includes second nanocomposites CX2. The second nanocomposites CX2 include a second wax particle and at least one second nano light emitter disposed inside the second wax particle. The second nanocomposites CX2 may have any one of the structures of the nanocomposites described with reference to FIGS. 1A to 1C and 3A to 3C.

The second nanocomposites CX2 may have the same or different structure as the first nanocomposites CX1. For example, when the first nanocomposites CX1 have the structure described with reference to FIG. 1A, the second nanocomposites CX2 may have the structure described with reference to FIG. 3A. Alternatively, the first and second nanocomposites CX1 and CX2 may both have the structure described with reference to FIG. 1B.

At the same time, the second nanocomposites CX2 may include at least one of a blue nanocomposite, a green nanocomposite, and a red nanocomposite. For example, the second nanocomposites CX2 may be composed of green nanocomposites or red nanocomposites. Alternatively, the second nanocomposites CX2 may include a plurality of green nanocomposites and a plurality of red nanocomposites. In contrast, the second nanocomposites CX2 may include multicolor nanocomposites.

Meanwhile, the second nanocomposites CX2 may have an emission peak in a wavelength band different from a wavelength band in which the emission peaks of the first nanocomposites CX1 belong. In this case, the full width at half maximum (FWHM) of the emission peak of each of the first nanocomposites CX1 may be about 70 nm or less. Preferably, the full width at half maximum may be about 50 nm or less, more preferably about 40 nm or less. The half width may be equally applied to the second nanocomposites CX2.

For example, when the first nanocomposites CX1 are composed of green nanocomposites, the second nanocomposites CX2 may be composed of red nanocomposites. In this case, the second nanocomposites CX2 may further include green nanocomposites.

As another example, when the first nanocomposites CX1 are composed of green nanocomposites, the second nanocomposites CX2 may be composed of multicolor nanocomposites including a green nano emitter and a red nano emitter. have.

The second optical layer 1300 includes a light diffusion pattern 1310 formed on a surface thereof. Since the light diffusion pattern 1310 is substantially the same as the continuous pattern 520a described with reference to FIG. 4C, detailed descriptions thereof will be omitted. Alternatively, the light diffusion pattern 1310 may be a discontinuous convex pattern 520b described with reference to FIG. 4E or a discontinuous concave pattern 520c described with reference to FIG. 4F.

In FIG. 5B, the light diffusion pattern 1310 of the second optical layer 1300 is a continuous pattern having substantially the same structure as the light diffusion pattern 1210 of the first optical layer 1200. It may be a continuous pattern having a structure.

Referring to FIG. 5C, the diffusion sheet 1003 according to another embodiment of the present invention includes a base substrate 1100, a first optical layer 1200, a second optical layer 1302, and an intermediate layer 1400. .

The first optical layer 1200 is formed on one surface of the base substrate 1100 and includes first nanocomposites CX1. Since the first optical layer 1200 is substantially the same as described with reference to FIG. 5A, detailed descriptions thereof will be omitted.

The second optical layer 1302 is formed on the other surface opposite to one surface of the base substrate 110 on which the first optical layer 1200 is formed, and includes second nanocomposites CX2. Since the second optical layer 1302 is substantially the same as that described in FIG. 5B except that the surface thereof is a flat surface, overlapping detailed descriptions are omitted. Although the surface of the second optical layer 1302 is illustrated as being flat, the second optical layer 1302 may further include a light diffusion pattern 1310 substantially the same as that described with reference to FIG. 5B.

The intermediate layer 1400 is disposed between the first and second

optical layers

1200 and 1302 and includes third nanocomposites CX3. The intermediate layer 1400 may be disposed between the base substrate 1100 and the second optical layer 1302.

The third nanocomposites CX3 include a third wax particle and at least one nano light emitter disposed inside the third wax particle. The third nanocomposites CX3 may have any one of the structures of the nanocomposites described with reference to FIGS. 1A to 1C and 3A to 3C. At the same time, the third nanocomposites CX3 may include at least one of a blue nanocomposite, a green nanocomposite, and a red nanocomposite. In contrast, the third nanocomposites CX3 may include multicolor nanocomposites.

The third nanocomposites CX3 may have an emission peak at a wavelength different from that of the first and second nanocomposites CX1 and CX2. For example, the first nanocomposites CX1 are composed of blue nanocomposites, the second nanocomposites CX2 are composed of red nanocomposites, and the third nanocomposites CX3 are It can be composed of green nanocomposites. In this case, the third nanocomposites CX3 may include green nanocomposites and red nanocomposites.

Referring to FIG. 5D, the diffusion sheet 1004 according to another embodiment of the present invention includes a base substrate 1100, a first optical layer 1200, a second optical layer 1302, and an intermediate layer 1402. .

The first optical layer 1200 is formed on one surface of the base substrate 1100 and includes first nanocomposites CX1. Since the base substrate 1100 and the first optical layer 1200 are substantially the same as those described with reference to FIG. 5A, detailed descriptions thereof will be omitted.

The second optical layer 1302 is formed on the other surface opposite to one surface of the base substrate 1100 and includes second nanocomposites CX2. Since the second optical layer 1302 is substantially the same as that described with reference to FIG. 5C except that the second optical layer 1302 is directly formed on the base substrate 1100, detailed descriptions thereof will be omitted.

The intermediate layer 1402 is formed between the base substrate 1100 and the first optical layer 1200. The intermediate layer 1402 includes third nanocomposites CX3. Since the intermediate layer 1402 is substantially the same as the intermediate layer 1400 described with reference to FIG. 5C except for the disposed position, detailed descriptions thereof will be omitted.

For example, the first nanocomposites CX1 are composed of blue nanocomposites, the second nanocomposites CX2 are composed of red nanocomposites, and the third nanocomposites CX3 are green. It may be composed of nanocomposites. In this case, each of the first to third nanocomposites CX1, CX2, and CX3 may further include any one of blue, red, and green nanocomposites in addition to the main nanocomposites constituting the nanocomposite.

Although FIG. 5D illustrates the case where the surface of the second optical layer 1302 is flat, the second optical layer 1302 may further include the light diffusion pattern 1310 described with reference to FIG. 5B.

Referring to FIG. 5E, the diffusion sheet 1005 according to another embodiment of the present invention includes a base substrate 1100, a first optical layer 1202, and a light diffusion layer 1500.

The first optical layer 1202 is formed on one surface of the base substrate 1100 and includes first nanocomposites CX1. Since the first optical layer 1202 is substantially the same as the first optical layer 1200 described with reference to FIG. 5A except that the surface thereof is a flat surface, detailed descriptions thereof will be omitted.

The light diffusion layer 1500 is formed on the other surface of the base substrate 1100 on which the first optical layer 1202 is formed. The light diffusion layer 1500 includes a light diffusion pattern 1510 formed on a surface thereof. The light diffusion pattern 1510 may be substantially the same pattern as the continuous pattern 520a described with reference to FIG. 4C. Alternatively, the light diffusion pattern 1510 may be any one of the discontinuous convex pattern 520b described with reference to FIG. 4E and the discontinuous concave pattern 520c described with reference to FIG. 4F. The light diffusion layer 1500 does not include a nanocomposite and simply serves to diffuse light.

In FIG. 5E, the surface of the first optical layer 1202 is illustrated as being flat. However, the optical patterns described with reference to FIGS. 4C and 4E to 4G may be formed on the surface of the first optical layer 1202. have.

Referring to FIG. 5F, a diffusion sheet 1006 according to another embodiment of the present invention includes a base substrate 1100, a first optical layer 1204, and a light diffusion layer 1500.

The first optical layer 1204 is substantially the same as the first optical layer 1202 described with reference to FIG. 5E except that the first optical layer 1204 is disposed between the base substrate 1100 and the light diffusion layer 1500. Therefore, redundant descriptions are omitted.

The light diffusion layer 1500 is formed on the first optical layer 1204. The light diffusion layer 1500 does not include a nanocomposite layer and simply performs a function of diffusing light. Since the light diffusion layer 1500 is substantially the same as that described with reference to FIG. 5E, detailed descriptions thereof will be omitted.

Referring to FIG. 5G, the diffusion sheet 1007 according to another embodiment of the present invention includes a base substrate 1100, a first optical layer 1204, a second optical layer 1302, and a light diffusion layer 1500. do.

The first optical layer 1204 is disposed on one surface of the base substrate 1100 and includes first nanocomposites CX1. The light diffusion layer 1500 is formed on the first optical layer 1204 and includes a light diffusion pattern 1510. The light diffusion layer 1500 is a layer that performs a function of simply diffusing light without a nanocomposite. The first optical layer 1204 and the light diffusion layer 1500 are substantially the same as described with reference to FIG. 5F. Therefore, redundant descriptions are omitted.

The second optical layer 1302 is disposed on the other surface opposite to one surface of the base substrate 1100 on which the first optical layer 1204 is formed, and includes second nanocomposites CX2. The second optical layer 1302 is substantially the same as described with reference to FIG. 5D. Therefore, redundant descriptions are omitted.

Referring to FIG. 5H, the diffusion sheet 1008 according to another embodiment of the present invention may include a base substrate 1100, a first optical layer 1204, a second optical layer 1302, and a first light diffusion layer 1500. And a second light diffusing layer 1600.

Except for further including the second light diffusion layer 1600, the diffusion sheet 1008 is substantially the same as the diffusion sheet 1007 described with reference to FIG. 5G, and thus detailed descriptions thereof will be omitted. The first light diffusion layer 1500 of FIG. 5H is the same layer as the light diffusion layer of FIG. 5G and performs a light diffusion function.

The second light diffusion layer 1600 is formed on the second optical layer 1302 so as to face the first light diffusion layer 1500. The second light diffusion layer 1600 includes a light diffusion pattern 1610 formed on a surface thereof, and is a layer that performs a function of simply diffusing light without a nanocomposite. The light diffusion pattern 1610 may be any one of the optical patterns described with reference to FIGS. 4C and 4E to 4G.

Referring to FIG. 5I, a diffusion sheet 1009 according to another embodiment of the present invention includes a base substrate 1100, a first optical layer 1200, and a light collecting layer 1700.

The first optical layer 1200 is formed on one surface of the base substrate 1100. Since the first optical layer 1200 includes the light diffusion pattern 1210 formed on the surface thereof and is substantially the same as that described with reference to FIG. 5A, detailed descriptions thereof will be omitted.

The light collecting layer 1700 is formed on the other surface facing the one surface facing the first optical layer 1200. The light collecting layer 1700 includes a light collecting pattern 1710 formed on a surface thereof. Since the condensing pattern 1710 is substantially the same as the optical pattern described with reference to FIG. 4G, detailed descriptions thereof will be omitted.

As described with reference to FIGS. 5A to 5I, the nanocomposite described in FIGS. 1A to 1C and 3A to 3C may be variously applied to the diffusion sheet. By using the nanocomposite, the diffusion sheet according to the present invention can convert the light provided by the light source to be provided to the display panel, thereby improving color purity and color reproducibility of the display device.

Referring to FIG. 6A, the light collecting sheet 2001 according to the exemplary embodiment of the present invention includes a base substrate 2100, a light collecting layer 2200, and a first optical layer 2300.

The base substrate 2100 is formed of a transparent material. The transparent material is substantially the same as the transparent material forming the base substrate 1100 of the diffusion sheet 1001 described in FIG. 5A. Therefore, redundant descriptions are omitted.

The light collecting layer 2200 is formed on one surface of the base substrate 2100. The light collecting layer 2200 includes a light collecting pattern 2210 formed on a surface thereof. The condensing pattern 2210 may be substantially the same as the optical pattern described with reference to FIG. 4G. The condensing pattern 2210 is formed to have a cross-sectional shape that can refract light incident from the base substrate 2100 in a vertical direction. Since the cross-sectional shape is the same as the shape described in FIG.

The first optical layer 2300 is formed on the other surface opposite to the one surface facing the light collecting layer 2200. The first optical layer 2300 includes first nanocomposites CX1. Each of the first nanocomposites CX1 includes a first wax particle and at least one first nano light-emitting body disposed inside the first wax particle. Each of the first nanocomposites CX1 may have any one of the structures of the nanocomposites described with reference to FIGS. 1A to 1C and 3A to 3C. At the same time, the first nanocomposites CX1 may include at least one selected from blue, green and red nanocomposites. Alternatively, the first nanocomposites CX1 may be composed of multicolor nanocomposites.

The first optical layer 2300 may include an optical pattern formed on the surface. The optical pattern may have any one of the structures described with reference to FIGS. 4C to 4F. Therefore, redundant descriptions are omitted.

Although not illustrated, the light collecting sheet 2001 may be disposed between the first optical layer 2300 and the base substrate 2100, or may be disposed between the light collecting layer 2200 and the base substrate 2100. It may further include a second optical layer. In this case, the second optical layer may include a second nanocomposite including a second wax particle and at least one second nano light-emitting body disposed inside the second wax particle.

Referring to FIG. 6B, the light collecting sheet 2002 according to another embodiment of the present invention includes a base substrate 2100, a first optical layer 2300, and a light collecting layer 2200.

The light collecting sheet 2002 is substantially the same as the light collecting sheet 2001 described with reference to FIG. 6A except that the first optical layer 2300 is disposed between the base substrate 2100 and the light collecting layer 2200. Do. Therefore, redundant descriptions are omitted.

Although not illustrated, the light collecting sheet 2002 may further include a second optical layer disposed between the first optical layer 2300 and the base substrate 2100. In this case, the second optical layer may include a second nanocomposite.

Referring to FIG. 6C, the light collecting sheet 2003 according to another embodiment of the present invention includes a base substrate 2100 and a light collecting layer 2202.

The light collecting layer 2202 is formed on one surface of the base substrate 2100 and includes first nanocomposites CX1. The light collecting layer 2202 has a light collecting pattern 2210 formed on a surface thereof. Since the first nanocomposites CX1 are substantially the same as those described with reference to FIG. 6A, detailed descriptions thereof will be omitted.

Although not illustrated, the light collecting sheet 2003 may be formed on the other surface of the light collecting layer 2202 facing one surface of the light collecting layer 2202, or may be formed between the base substrate 2100 and the light collecting layer 2202. It may further include. In this case, the optical layer may include a second nanocomposite.

Referring to FIG. 6D, the light collecting sheet 2004 according to another embodiment of the present invention may include a base substrate 2100, a light collecting layer 2202 in which the first nanocomposites CX1 are dispersed, and a first optical layer 2400. ).

The light collecting sheet 2004 is substantially the same as the light collecting sheet 2003 described with reference to FIG. 6C except that the light collecting sheet 2004 further includes the first optical layer 2400. Therefore, redundant descriptions are omitted.

The first optical layer 2400 is formed on the other surface opposite to one surface of the base substrate 2100 on which the light collecting layer 2202 is formed. The first optical layer 2400 includes a light diffusion pattern 2410 formed on a surface thereof. Since the light diffusion pattern 2410 is substantially the same as the continuous pattern 520a described with reference to FIG. 4C, detailed descriptions thereof will be omitted. Alternatively, the light diffusion pattern 2410 may be the same pattern as the optical pattern described with reference to FIGS. 4E and 4F.

Although not shown in the drawings, the light collecting sheet 2004 may further include a second optical layer formed between the base substrate 2100 and the first optical layer 2400. The second optical layer may include a second nanocomposite.

As described with reference to FIGS. 6A to 6D, the nanocomposites described in FIGS. 1A to 1C and 3A to 3C may be variously applied to the light collecting sheet. The light collecting sheet according to the present invention can improve the color purity and color reproducibility of colors displayed by the display device by converting light provided by the light source to the display panel by using the nanocomposite.

Referring to FIG. 7A, a light guide plate 3001 according to an embodiment of the present invention includes a base substrate 3100, an output pattern 3200, and a first optical layer 3300.

The base substrate 3100 is formed of a transparent material. Examples of the transparent material include, but are not limited to, polymethylmethacrylate (PMMA) resin, polycarbonate (PC) resin, and the like.

The light exit pattern 3200 is formed on one surface of the base substrate 3100. In the base substrate 3100, a surface on which the light exit pattern 3200 is formed becomes a reflecting portion of the light guide plate 3001. In the light guide plate 3001, when a side facing the light source is called a light incident part of the light guide plate 3001, the light emitted from the light source and guided to the base substrate 3100 through the light incident part is reflected by the reflector. Afterwards, the light may be emitted to the outside through the light exit unit facing the reflector. The light exit pattern 3200 may have various shapes such as a convex pattern and a concave pattern, and may be a pattern additionally formed on one surface of the base substrate 3100. In contrast, the light exit pattern 3200 may be a pattern formed by partially patterning one surface of the base substrate 3100.

The first optical layer 3300 is formed on the other surface facing the one surface. That is, the side where the first optical layer 3300 is formed may be the light exit portion of the light guide plate 3001. The first optical layer 3300 includes first nanocomposites CX1. The first nanocomposites CX1 may have any one of the structures of the nanocomposites described with reference to FIGS. 1A to 1C and 3A to 3C. At the same time, the first nanocomposites CX1 may include at least one selected from blue, green and red nanocomposites. In contrast, the first nanocomposites CX1 may include a multi-color nanocomposite. Although not illustrated, the first optical layer 3300 may include a pattern substantially the same as that of the light exit pattern 3200.

In FIG. 7A, only the first optical layer 3300 is formed on one surface of the base substrate 3100, but the second nanocomposite is formed between the base substrate 3100 and the first optical layer 3300. A second optical layer may be formed. Alternatively, the second optical layer may be formed between the light exit pattern 3200 and the base substrate 3100.

Referring to FIG. 7B, a light guide plate 3002 according to another embodiment of the present invention includes a base substrate 3100, an output pattern 3210, and a first optical layer 3300 in which the first nanocomposite CX1 is dispersed. do.

The light guide plate 3002 is substantially the same as the light guide plate 3001 described with reference to FIG. 7A except that the light exit pattern 3210 includes the second nanocomposite CX2. Therefore, redundant descriptions are omitted. Although not illustrated in the drawing, the first optical layer 3300 may further include a pattern substantially the same as the light emission pattern described with reference to FIG. 7A.

The light exit pattern 3210 includes the second nanocomposite CX2. The second nanocomposite CX2 includes a second wax particle and at least one second nano light emitter disposed inside the second wax particle.

The second nanocomposite CX2 may have any one of the structures of the nanocomposites described with reference to FIGS. 1A to 1C and 3A to 3C. At the same time, the second nanocomposite CX2 may include at least one of blue, green, and red nanocomposites, and may be composed of multicolor nanocomposites. The second nanocomposite CX2 may have an emission peak different from that of the first nanocomposite CX1. For example, the second nanocomposite CX2 may be formed of a green nanocomposite, and the first nanocomposite CX1 may be formed of a red nanocomposite.

Although not shown in the drawings, the light guide plate 3002 may further include a second optical layer disposed between the first optical layer 3300 and the base substrate 3100. In this case, the second optical layer may include a third nanocomposite different from the first and second nanocomposites CX1 and CX2. The third nanocomposite includes a third wax particle and at least one third nano light emitter disposed inside the third wax particle.

Referring to FIG. 7C, a light guide plate 3003 according to another embodiment of the present invention includes a base substrate 3100 and a light exit pattern 3200.

The light exit pattern 3200 is substantially the same as that described with reference to FIG. 7A, and the base substrate 3100 includes a first nanocomposite CX1. The first nanocomposite CX1 is substantially the same as described with reference to FIG. 7A.

Although not illustrated, an optical layer including the second nanocomposite may be formed on the other surface of the base substrate 3100 on which the light emission pattern 3200 is formed. Alternatively, the optical layer may be formed between the base substrate 3100 and the light exit pattern 3200.

As described with reference to FIGS. 7A to 7C, the nanocomposites described with reference to FIGS. 1A to 1C and 3A to 3C may be variously applied to the light guide plate. The light guide plate according to the present invention can improve the color purity and color reproducibility of the display device by using the nanocomposite, thereby converting the light provided by the light source to the display panel.

백라이트 유닛Backlight unit

Referring to FIG. 8, the backlight unit 5001 according to an embodiment of the present invention may include a light source 5100, a light guide plate 5200, a reflective plate 5300, a diffusion sheet 5400, a first light collecting sheet 5510, and a first light collecting sheet 5510. 2 light collecting sheet 5520 is included.

As the light source 5100, a white light emitting module or a blue light emitting module may be used.

The white light emitting module may include a blue light emitting chip that generates blue light, and a light conversion layer covering the blue light emitting chip. That is, since the light conversion layer absorbs and / or converts blue light generated by the blue light emitting chip, the white light emitting module may finally display white light. The light conversion layer may include a nano-luminescent material including a phosphor or a quantum dot, including YAG (Yttrium aluminum garnet). As the nano light emitter, green quantum dots may be used. In contrast, the light conversion layer may include the nanocomposite described in FIGS. 1A to 1C and 3A to 3C.

The blue light emitting module includes a blue light emitting chip that generates blue light. That is, the observer can visually recognize the blue light emitted from the blue light emitting chip of the blue light emitting module.

The light guide plate 5200 is disposed adjacent to the light source 5100, the light generated by the light source 5100 is incident to the light guide plate 5200, and the light emitted from the light guide plate 5200 is diffused to the sheet 5400. May be incident to The light guide plate 5200 may include any one of the

light guide plates

3001, 3002, and 3003 according to the present invention described with reference to FIGS. 7A to 7C.

The reflective plate 5300 is disposed below the light guide plate 5200, that is, to face the reflective part of the light guide plate 5200, and reflects light leaked through the reflective part of the light guide plate 5200 back to the light guide plate 5200. Improve the efficiency of light utilization

The diffusion sheet 5400 may be disposed on the light guide plate 5200 and diffuse light emitted from the light guide plate 5200. The diffusion sheet 5400 may include any one of the diffusion sheets 1001 to 1009 described with reference to FIGS. 5A to 5I.

The first light collecting sheet 5510 is disposed on the diffusion sheet 5400, and a light collecting pattern including a plurality of protrusions described with reference to FIG. 4G is formed on an upper surface of the first light collecting sheet 5510. The second light collecting sheet 5520 is disposed on the first light collecting sheet 5510, and has a shape substantially the same as a protrusion formed on the first light collecting sheet 5510 on an upper surface of the second light collecting sheet 5520. A plurality of protrusions is formed. The length direction of the protrusion formed on the first light collecting sheet 5510 and the length direction of the protrusion formed on the second light collecting sheet 5520 may cross at a predetermined angle. In this case, the angle at which the protrusions cross in the longitudinal direction may be about 90 °. At least one of the first and second

light collecting sheets

5510 and 5520 may include any one selected from the light collecting sheets 2001 to 2004 described with reference to FIGS. 6A to 6D.

For example, when the white light emitting module is used as the light source 5100, at least one of the light guide plate 5200, the diffusion sheet 5400, and the first and second

light collecting sheets

5510 and 5520 is green. Nanocomposites and / or red nanocomposites. Even if the color purity of the light generated by the white light emitting module is low, the green nanocomposite and / or at least one of the light guide plate 5200, the diffusion sheet 5400, and the first and second

light collecting sheets

5510 and 5520. By applying the red nanocomposite, the color purity of the white light provided by the backlight unit 5001 may be improved.

Meanwhile, even when a white light emitting module providing white light having high color purity is used, the light guide plate 5200, the diffusion sheet 5400, the first and second

light collecting sheets

5510 and 5520, in particular, the light guide plate 5200 are used. In the meantime, a color coordinate deviation occurs between the light emitted from the light incident portion on the side where the light source is arranged and the light emitted from the light facing portion opposite to the light incident portion. The color coordinate deviation occurs because light of a specific wavelength is scattered relatively much while the light is guided from the light incident part to the light receiving part, and the observer is responsible for the yellowish problem in the light receiving part. To be recognized. In addition, color purity and color coordinate uniformity of the display device may also be deteriorated by characteristics of the material forming the diffusion sheet 5400 and the first and second

light collecting sheets

5510 and 5520. The problems described above may be solved by applying a blue nanocomposite to at least one of the light guide plate 5200, the diffusion sheet 5400, and the

light collecting sheets

5510 and 5520.

As another example, when the blue light emitting module is used as the light source 5100, at least one of the light guide plate 5200, the diffusion sheet 5400, and the first and second

light collecting sheets

5510 and 5520 is green. Nanocomposites and red nanocomposites. That is, even if the light source 5100 generates blue light, the green nanocomposite and the red nanocomposite generate green light and red light, so that the observer may recognize the light passing through the backlight unit 5001 as white light.

As another example, when using the ultraviolet light emitting module as the light source 5100, at least one of the light guide plate 5200, the diffusion sheet 5400, the first and second light collecting sheets (5510, 5520), Green nanocomposites, red nanocomposites and blue nanocomposites. At this time, any one optical sheet may include all of the green, red and blue nanocomposites. Alternatively, the diffusion sheet 5400 may include a blue nanocomposite, the first condensing sheet 5510 may include a green nanocomposite, and the second condensing sheet 5520 may include a red nanocomposite. Alternatively, one of the optical sheets may include two nanocomposites among green, red and blue nanocomposites, and the other optical sheet may include one nanocomposite. For example, the diffusion sheet 5400 may include a blue nanocomposite, and the first light collecting sheet 5510 may include green and red nanocomposites. The green, red, and blue nanocomposites applied to the light guide plate 5200, the diffusion sheet 5400, and the first and second

light collecting sheets

5510 and 5520 absorb green light generated by the ultraviolet light emitting module to emit green light and red light. And by generating blue light, the backlight unit 5001 may provide white light to the display panel.

Referring to FIG. 9, the backlight unit 5002 according to another embodiment of the present invention may include a light source 5100, a light guide plate 5200, a reflecting plate 5300, an optical sheet 5600, a diffusion sheet 5400, and a first condensing light. The sheet 5510 and the second light collecting sheet 5520 are included. Since the backlight unit 5002 is substantially the same as the backlight unit 5001 described with reference to FIG. 8 except that the backlight unit 5002 further includes an optical sheet 5600, detailed descriptions thereof will be omitted.

The optical sheet 5600 is a sheet including a nanocomposite, and is independent of the light guide plate 5200, the diffusion sheet 5400, the first light collecting sheet 5510, and the second light collecting sheet 5520. Included). In this case, the light guide plate 5200, the diffusion sheet 5400, the first light collecting sheet 5510, and the second light collecting sheet 5520 may use those conventionally used in the art. That is, by inserting only the optical sheet 5600 including the nanocomposites described with reference to FIGS. 1A through 1C and 3A through 3C into the backlight unit 5002, color reproducibility of the display device may be widened to improve color reproducibility. .

As described above, at least one optical sheet of the light guide plate 5200, the diffusion sheet 5400, the first condensing sheet 5510, and the second condensing sheet 5520, or a separate optical sheet independent of these, is provided. By applying the nanocomposites described with reference to FIGS. 1A to 1C and 3A to 3C, the

backlight units

5001 and 5002 may provide light having high color purity as color filters of the display panel, and color reproduction of the display device. By widening the area, color reproducibility can be improved.

Hereinafter, the effects of the present invention will be described through evaluation of color coordinates and color reproduction regions of the optical sheets and the backlight unit and the display device including the optical sheets according to the embodiments and the comparative examples.

백라이트 유닛의 제조 (실시예 1 내지 6 및 비교예 1 내지 7)Manufacture of backlight unit (Examples 1 to 6 and Comparative Examples 1 to 7)

[실시예 1]Example 1

A blue light emitting module having a light emission peak at about 444 nm was used as a light source, and a light guide plate, a diffusion sheet, a first light collecting sheet, and a second light collecting sheet were manufactured and prepared in the following manner.

(1) Manufacture of light guide plate

0.5 parts by weight of a benzotriazole UV absorber (trade name: Tinuvin-329, BASF, Germany) and a hindered amine light stabilizer (trade name: Tinuvin-770, BASF, Germany) based on 100 parts by weight of the methyl methacrylate polymer. After mixing 0.5 parts by weight, a pellet-type resin was prepared by using an extruder (inner diameter: 27 mm, L / D: 40, Leistritz. Co.), which was extruded using a sheet extruder to produce a light guide plate having a thickness of about 0.4 mm. Was prepared.

(2) Preparation of Diffusion Sheet

First, 20 mg of a wax (trade name: Licowax PED 136 wax, Clariant, Switzerland) having an acid value of about 30 mg KOH / g as an oxidized high density polyethylene wax (Oxidized HDPE Wax) as a wax-based compound in 1 ml of toluene After mixing, the wax-based compound was dissolved by raising the temperature to about 150 ℃ to prepare a wax solution. A solution in which about 20 mg of CdSe-based red nano light-emitting body (trade name: Nanodot-HE-610, QD solution, Korea) was dispersed in 1 ml of toluene was added to the wax solution, mixed, and cooled to room temperature, followed by BASF The urethane acrylate purchased from the company (company name, Germany) and the photoinitiator (diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide, TPO) purchased from BASF were mixed. The photoinitiator was mixed at about 0.8 parts by weight based on 100 parts by weight of urethane acrylate. Then, toluene was removed using an evaporator to prepare a first coating composition in which urethane acrylate, a red nanocomposite, and a photoinitiator were mixed. The first coating composition was coated on a transparent base substrate (trade name: XU42, Toray Industries, Japan) of about 38 μm thickness and cured to form a light diffusion layer having the shape shown in FIG. 4C on its surface. . The average thickness of the light diffusion layer was about 50 μm.

Subsequently, a solution in which about 20 mg of CdSe-based green nano light-emitting body (trade name: Nanodot-HE-530, QD solution, Korea) was dispersed in 1 ml of toluene was added to the wax solution prepared in the process of preparing the red nanocomposite. After mixing, the mixture was cooled to room temperature and mixed with urethane acrylate and a photoinitiator. Then toluene was removed using an evaporator to prepare a second coating composition in which urethane acrylate, photoinitiator and green nanocomposite were mixed. The second coating composition was coated on the opposite side of the base substrate on which the light diffusion layer was formed and cured to form an optical layer. The thickness of the optical layer was about 50 μm.

As a result, a diffusion sheet including the base substrate, the light diffusion layer, and the optical layer was manufactured.

(3) Preparation of the first and second light collecting sheets

0.07 weight of catalyst (tetra-n-butylphosphonium bromide) purchased from Nippon Kogyo Co., Ltd. (Japan) with respect to 100 weight part of bis (2,3- epithiopropyl) sulfides. The parts were mixed and stirred at room temperature to prepare a homogeneous liquid. After stirring and defoaming the homogeneous solution, a polytetrafluoroethylene membrane (PTFE membrane) having a thickness of about 0.5 μm was filtered to prepare a base material, which was applied onto a PET film having a thickness of about 75 μm and then pressurized with a forming roll. A light condensing pattern having a height of about 25 μm was prepared on the PET film, thereby preparing a first light condensing sheet.

The second light collecting sheet was manufactured through a process substantially the same as the method of manufacturing the first light collecting sheet.

(4) manufacture of backlight unit

A light guide plate, a diffusion sheet, a first light collecting sheet, and a second light collecting sheet manufactured by the above method were sequentially stacked, and a blue light emitting module was assembled to prepare a backlight unit according to Example 1 of the present invention.

[실시예 2]Example 2

YAG phosphors (YAG Phosphor) purchased from Nichia (Japan, Japan) were applied together with OE-6630 silicone resin (trade name, Dow Corning, USA) on a blue light emitting chip having an emission peak at about 444 nm and then cured. A white light emitting module was prepared.

Except for using the white light emitting module as a light source, a backlight unit substantially the same as Example 1 was prepared as a backlight unit according to Example 2 of the present invention.

[실시예 3]Example 3

First, a light guide plate substantially the same as in Example 1 was prepared.

With respect to 100 parts by weight of urethane acrylate purchased from BASF (company name, Germany), mixed with about 0.7 parts by weight of photoinitiator (diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide, TPO) purchased from BASF, Coated and cured on a transparent base substrate (trade name: XU42, Toraya, Japan) of about 38 μm thick to form a light diffusion layer having an average thickness of about 50 μm and having the shape shown in FIG. 4C on its surface. To prepare a diffusion sheet.

In the first light collecting sheet of Example 1, the second coating composition comprising the green nanocomposite described in Example 1 was coated and cured on the other side of one surface of the PET film having the light collecting pattern, thereby having an average thickness of about 5 μm. And an optical layer having a shape shown in Fig. 4D on the surface thereof, to prepare a first light collecting sheet according to Example 3.

In addition, in the second light collecting sheet of Example 1, the first coating composition comprising the red nanocomposite described in Example 1 is coated and cured on the other surface of the PET film on which the light collecting pattern is formed to obtain an average thickness. An optical layer having a shape shown in FIG. 4D and having a shape of about 5 μm on its surface was formed to prepare a second light collecting sheet according to Example 3. FIG.

A light guide plate, a diffusion sheet, a first light collecting sheet, and a second light collecting sheet prepared as described above were assembled with a blue light emitting module exhibiting an emission peak at about 444 nm to prepare a backlight unit according to Example 3 of the present invention.

[실시예 4]Example 4

A backlight unit substantially the same as Example 3 was prepared as a backlight unit according to Example 4 of the present invention, except that the white light emitting module described in Example 2 was used as the light source.

[실시예 5]Example 5

First, the diffusion sheet in Example 3, the first light collecting sheet and the second light collecting sheet in Example 1 were prepared.

In addition, on one surface of the light guide plate of Example 1, the second coating composition including the green nanocomposite described in Example 1 was coated and cured to form a first optical layer having a thickness of about 5 μm. Subsequently, on the first optical layer, the first coating composition including the red nanocomposite described in Example 1 was coated and cured to form a second optical layer having a thickness of about 5 μm. Accordingly, a light guide plate according to Example 5 of the present invention including a base substrate, first and second optical layers was manufactured.

The light guide plate, the diffusion sheet, and the first and second light collecting sheets prepared above were assembled with a blue light emitting module showing an emission peak at about 444 nm to prepare a backlight unit according to Example 5 of the present invention.

[실시예 6]Example 6

Except for using the white light emitting module as a light source, the same backlight unit as in Example 5 was prepared as a backlight unit according to Example 6 of the present invention.

[비교예 1]Comparative Example 1

A backlight unit substantially the same as Example 1 was used as the backlight unit according to Comparative Example 1, except that the light source module described in Example 2 was used as the light source and a diffusion sheet included in the backlight unit according to Example 3 was used. Ready.

[비교예 2]Comparative Example 2

Instead of the red nanocomposite, red nano light-emitting body (trade name: Nanodot-HE-610, QD solution, Korea) was used for the diffusion sheet, and green nano light-emitting body (trade name: Nanodot-HE-530, QD solution, Korea) instead of the green nanocomposite. Except for using, a backlight unit substantially the same as Example 1 was prepared as a backlight unit according to Comparative Example 2.

[비교예 3]Comparative Example 3

A backlight unit substantially the same as that of Comparative Example 2 was prepared as a backlight unit according to Comparative Example 3, except that a white light emitting module was used as the light source.

[비교예 4][Comparative Example 4]

Instead of the green nanocomposite on the first light collecting sheet, a green nano light emitting body (trade name: Nanodot-HE-530, QD solution, Korea) is used, and a red nano light emitting body (trade name: Nanodot-HE-610 instead of a red nanocomposite on the second light collecting sheet) , QD solution, Korea), except that the backlight unit substantially the same as Example 3 was prepared as a backlight unit according to Comparative Example 4.

[비교예 5][Comparative Example 5]

A backlight unit substantially the same as that of Comparative Example 2 was prepared as a backlight unit according to Comparative Example 5, except that a white light emitting module was used as the light source.

[비교예 6]Comparative Example 6

Instead of the red nanocomposite, use a red nano light emitter (trade name: Nanodot-HE-610, QD solution, Korea) on the light guide plate, and use a green nano light emitter (trade name: Nanodot-HE-530, QD solution, Korea) instead of the green nanocomposite. Except for the use, a backlight unit substantially the same as Example 5 was prepared as a backlight unit according to Comparative Example 6.

[비교예 7]Comparative Example 7

A backlight unit substantially the same as that of Comparative Example 6 was prepared as a backlight unit according to Comparative Example 7, except that a white light emitting module was used as the light source.

[실험 2]- 표시 장치의 색좌표 및 색재현 영역 평가[Experiment 2]-Evaluation of color coordinate and color reproduction area of display device

Each of the backlight units according to Examples 1 to 6 and Comparative Examples 1 to 7 of the present invention was assembled with a display panel of an iPhone 4 (trade name, Apple, USA) to prepare display devices 1 to 6 and comparative devices 1 to 7. .

Color gamut, luminance and color coordinates (red, green) using SR-3AR (product name, TOPCON, Japan) as a spectroradiometer for each of the display devices 1 to 6 and the comparison devices 1 to 7 , Blue) was measured. The red, green, and blue color coordinates were obtained by recording the color coordinates indicated by the spectrophotometer after allowing the display panel of the iPhone 4 to display red, green, and blue, respectively. The results are shown in Table 2 below.

In Table 2, each of the red, green, and blue color coordinates is represented based on the CIE 1931 color coordinate system, and the gamut ratio is shown for each display device and a comparison device for the gamut range (hereinafter, NTSC gamut range) based on the National Television Systems Committee (NTSC). The percentage of the area of the triangle followed by the RGB color coordinates in.

TABLE 2

division	Color Gamut Ratio (%)	Luminance (cd / m ² )	Color coordinates-red (CIE 1931)	Color coordinates-green (CIE 1931)	Color coordinates-blue (CIE 1931)
Display device 1	89.2	350	(0.660, 0.319)	(0.205, 0.705)	(0.160, 0.123)
Indicator 2	78.7	313	(0.652, 0.330)	(0.210, 0.650)	(0.160, 0.123)
Indicator 3	80.4	340	(0.648, 0.325)	(0.215, 0.667)	(0.160, 0.123)
Indicator 4	73.9	310	(0.630, 0.340)	(0.220, 0.648)	(0.160, 0.123)
Indicator 5	84.5	330	(0.648, 0.319)	(0.205, 0.689)	(0.160, 0.123)
Indicator 6	74.7	290	(0.633, 0.342)	(0.224, 0.652)	(0.160, 0.123)
Comparison device 1	51.3	314	(0.611, 0.354)	(0.318, 0.564)	(0.160, 0.123)
Comparator 2	89.2	340	(0.665, 0.323)	(0.230, 0.687)	(0.160, 0.123)
Comparator 3	76.9	305	(0.657, 0.336)	(0.228, 0.642)	(0.160, 0.123)
Comparator 4	80.2	330	(0.650, 0.334)	(0.219, 0.666)	(0.160, 0.123)
Comparator 5	74.0	300	(0.635, 0.355)	(0.230, 0.650)	(0.160, 0.123)
Comparing Device 6	83.9	330	(0.655, 0.319)	(0.230, 0.687)	(0.160, 0.123)
Comparator 7	75.5	285	(0.648, 0.336)	(0.228, 0.642)	(0.160, 0.123)

FIG. 10 is an image illustrating a color reproduction area of a display device including the backlight unit according to Comparative Example 1, and FIGS. 11A to 11F are color reproduction areas of the display devices including the backlight units according to embodiments 1 to 6. FIG. Images to illustrate this.

Referring to Tables 2, 10, and 11A to 11F, the color reproduction region of the comparison apparatus 1 including the backlight unit according to Comparative Example 1 is about 51.3% of the NTSC color gamut range, but the display apparatuses 1 to 6 The color reproduction area is about 73.9% to about 89.2% of the NTSC color gamut range, and it can be seen that the display devices 1 to 6 have a significantly wider color reproduction area than the comparison device 1.

Specifically, when the comparison device 1 and the display devices 1 to 6 are compared, the blue color coordinates may be regarded as substantially similar levels, but the red x coordinate of the display devices 1 to 6 is larger than the red x coordinate of the comparison device 1. It can be seen that it has. In addition, the green x coordinate of the display devices 1 to 6 has a smaller value than the green x coordinate of the comparison device 1, and the green y coordinate of the display devices 1 to 6 has a larger value than the green y coordinate of the comparison device 1. Able to know.

Referring to the above results, it can be seen that the color purity of each of the red and green colors of the display devices 1 to 6 is relatively higher than that of the comparison device 1. That is, even when the same display panel is used, the display device may realize red and green colors having higher color purity than the backlight unit according to Comparative Example 1, and the colors that the display device may implement. It can be seen that the area is widened.

In addition, the display devices 1 to 6 may exhibit substantially the same level as or higher than that of the comparative device 1 even though the nanocomposite having the structure in which the nano light-emitting body is covered with wax particles is dispersed. Able to know.

Meanwhile, although the display devices 1 to 6 include nanocomposites having a structure in which the nano light emitters are encapsulated by wax particles, the red and green color purity is substantially the same as the red and green color purity of the comparative devices 2 to 7. You can see that it is implemented as a level. In other words, even when the nano light-emitting body is coated with wax particles, it can be seen that the wax particles are not a factor for lowering the quantum efficiency of the nano light-emitting body.

평판 시트 1, 2 및 비교 시트 1의 제조Preparation of Flat Sheets 1, 2 and Comparative Sheet 1

[평판 시트 1의 제조][Production of Flat Sheet 1]

20 mg of a wax (trade name: Licowax PED 136 wax, Clariant, Switzerland) having an acid value of about 30 mg KOH / g as an oxidized high density polyethylene wax (Oxidized HDPE Wax) as a wax-based compound was mixed with 1 ml of toluene. After that, the wax-based compound was dissolved by raising the temperature to about 150 ° C. to prepare a wax solution. A solution in which about 20 mg of CdSe-based red nano light-emitting body (trade name: Nanodot-HE-610, QD solution, Korea) was dispersed in 1 ml of toluene was mixed with the wax solution and cooled to room temperature to prepare a cooling solution. .

The cooling solution was mixed with a urethane acrylate purchased from BASF (company name, Germany) and a photoinitiator (diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide, TPO) purchased from BASF, followed by removal of toluene. To prepare a coating composition. The photoinitiator was mixed at about 0.8 parts by weight based on 100 parts by weight of urethane acrylate.

The coating composition was coated on a transparent base substrate (trade name: XU42, Toray Industries, Japan) having a thickness of about 38 μm and cured to prepare a flat sheet 1 including an optical layer having a thickness of about 50 μm. It was.

[평판 시트 2의 제조][Production of Flat Sheet 2]

After mixing 20 mg of the wax-based compound in 1 ml of toluene, the wax-based compound was dissolved by raising the temperature to about 150 ° C. to prepare a wax solution. The wax solution was mixed with a solution containing about 20 mg of CdSe-based red quantum dots (trade name: Nanodot-HE-606, QD solution, Korea) in 1 ml of toluene, and then cooled to room temperature to about 10 mg per 1 ml of toluene. A cooling solution in which particles of were dispersed was prepared. In this case, as the wax-based compound, a wax having an acid value of about 50 mg KOH / g (trade name: Licowax PED 136 wax, Clariant, Switzerland) was used as an oxidized high density polyethylene wax (Oxidized HDPE Wax). The cooling solution was added to a mixture of 10 ml of ethanol and 1 ml of TEOS (tetraethoxysilane, Sigma Aldrich, USA), and then additionally 2.5 ml of 30% ammonia water to form silicon oxide on the surface of the particles. The nanocomposite solution containing the complex was prepared.

In the nanocomposite solution, the nanocomposite was separated by centrifugation at about 5,000 rpm for about 30 minutes using a high speed centrifuge, washed with ethanol and distilled water, and then ethanol and distilled water were removed using an evaporator. After preparing the nanocomposite, and dispersed in toluene again to prepare a dispersion solution.

The dispersion solution was mixed with a urethane acrylate purchased from BASF (company name, Germany) and a photoinitiator (diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide, TPO) purchased from BASF, followed by removal of toluene. To prepare a coating composition. The photoinitiator was mixed at about 0.8 parts by weight based on 100 parts by weight of urethane acrylate.

The coating composition was coated on a transparent base substrate (trade name: XU42, Toray Industries, Japan) having a thickness of about 38 μm and cured to prepare a flat sheet 2 including an optical layer having a thickness of about 50 μm. It was.

[비교 시트 1의 제조][Production of Comparative Sheet 1]

Urethane acrylate and BASF purchased from BASF (company name, Germany) with a solution in which about 20 mg of CdSe-based red nano light-emitting body (trade name: Nanodot-HE-610, QD solution, Korea) was dispersed in 1 ml of toluene. After mixing with a photoinitiator (diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide, TPO) purchased from toluene was removed to prepare a coating composition. The photoinitiator was mixed at about 0.8 parts by weight based on 100 parts by weight of urethane acrylate.

The coating composition was coated on a transparent base substrate (trade name: XU42, Toray Industries, Japan) having a thickness of about 38 μm and cured to prepare Comparative Sheet 1 including an optical layer having a thickness of about 50 μm. .

[실험 3]- 광 안정성 및 열/수분 안정성 평가[Experiment 3]-Evaluation of light stability and heat / moisture stability

Each of the

flat sheet sheets

1, 2 and comparative sheet 1 prepared as described above was measured using an absolute quantum efficiency meter (trade name: C9920-02, HAMAMATSU, Japan). Subsequently, after irradiating ultraviolet light (UV) having a center wavelength of 365 nm for 480 hours at a radiation intensity of about 1.4 mW / cm ² , that is, under severe conditions of about 2,419.2 J / cm ² , the second quantum efficiency (QYT2, unit:% ) Was measured. The difference between the first quantum efficiency and the second quantum efficiency (ΔQY1 = QYT1-QYT2, unit:%) is calculated to be ultraviolet light for the red nanocomposites of the

flat sheets

1 and 2 and the red nano light-emitting bodies of the comparative sheet 1, respectively. The stability was evaluated.

In addition, the first quantum efficiency (QYT1, unit:%) was measured for the

flat sheets

1, 2 and the comparative sheet 1, and then exposed to harsh conditions of a temperature of 85 ° C. and a relative humidity of 85% in a constant temperature and humidity chamber for 480 hours. Then, the third quantum efficiency (QYT3, unit:%) was measured. The difference between the first quantum efficiency and the third quantum efficiency (ΔQY2 = QYT1-QYT3, unit:%) was calculated to determine the red nanocomposites of the

flat sheets

1 and 2 and the red nano light-emitting bodies of the comparative sheet 1, respectively. Moisture stability was evaluated.

The optical stability evaluation results and heat / moisture stability evaluation results are shown in Table 3 below.

In Table 3, the light stability and heat / moisture stability of Comparative Sheet 1 did not emit light after being exposed to harsh conditions, so that the second quantum efficiency and the third quantum efficiency could not be measured. Therefore, in Table 3,-is represented.

TABLE 3

	Quantum Efficiency (QY,%)	Optical stability (△ QY1,%)	Heat / moisture stability (△ QY2,%)
Flatbed Sheet 1	78.1	6	7
Flatbed sheet 2	75.5	4	5
Comparison sheet 1	32.5	-	-

Referring to Table 3, it can be seen that the quantum efficiency of each of the red nanocomposite included in the flat sheet 1 and the red nanocomposite included in the flat sheet 2 is superior to the quantum efficiency contained in the comparative sheet 1. That is, despite using the same nano light emitter as the red nano light emitter included in Comparative Sheet 1 to prepare

flat sheet

1 and 2 degrees nanocomposites, the quantum efficiency of the nanocomposites included in

flat sheet

1 and 2 is about 75% or more. It can be seen that it is maintained.

On the other hand, it can be inferred that at least a part of the red nano light-emitting body is damaged in the manufacturing process of Comparative Sheet 1, for example, mixing the red nano light-emitting body with urethane acrylate or curing the urethane acrylate.

In particular, in terms of light stability or heat / moisture stability, the nanocomposites of the

flat sheets

1 and 2 are damaged by light and heat / moisture at a very low level of about 7%, despite being exposed to harsh conditions. It can be seen that heat / moisture stability is good. On the other hand, the red nano light emitter does not emit light after the comparison sheet 1 is exposed to harsh conditions after the manufacture of the comparative sheet 1, so that the second and third quantum efficiency can not be measured, the light stability of the red nano light emitter itself And it can be seen that the heat / moisture stability is very bad.

As described above, the nanocomposite having a structure in which the nano light-emitting body is coated with wax particles is not only very stable to light, heat or moisture, but also mixed with a sheet-forming composition such as urethane acrylate and cured to prepare a sheet. Even though it can be seen that it is hardly damaged by light, heat or moisture.

백라이트 유닛의 제조(실시예 7 및 비교예 8)Manufacture of backlight unit (Example 7 and Comparative Example 8)

[실시예 7]Example 7

A back light unit substantially the same as that of Example 1 was prepared as a back light unit according to the seventh embodiment of the present invention, except that a light diffusion pattern having the shape shown in FIG. 4C was further formed on the surface of the optical layer of the diffusion sheet.

[비교예 8]Comparative Example 8

A backlight unit substantially the same as Comparative Example 2 was prepared as a backlight unit according to Comparative Example 8, except that a light diffusion pattern having a shape shown in FIG. 4C was further formed on the surface of the optical layer of the diffusion sheet.

[실험 4]- 휘도 및 색좌표 안정성 평가[Experiment 4]-Evaluation of stability of luminance and color coordinate

In order to independently perform ultraviolet light stability and heat / moisture stability evaluation, two backlight units according to Example 7 and Comparative Example 8 were prepared.

First, for each of the backlight units according to Example 7 and Comparative Example 8, SR-3AR (product name, TOPCON, Japan) was measured as initial spectrophotometer and initial color coordinate as a spectroradiometer.

Subsequently, one backlight unit according to Example 7 and Comparative Example 8 was selected to separate the diffusion sheet therefrom, and then the ultraviolet radiation (UV) having a central wavelength of 365 nm was radiated to the diffusion sheet at about 1.4 mW / cm ² . for 480 hours, that was investigated in severe conditions of about 2,419.2 J / cm ^2. The diffused sheet irradiated with ultraviolet rays was again assembled with the blue light emitting module, the light guide plate, the first and the second light collecting sheets, and the final luminance and the final color coordinate thereof were measured. The results are shown in Table 4.

In addition, after separating the diffusion sheet from the remaining backlight unit according to Example 7 and Comparative Example 8, the diffusion sheet was left in a thermo-hygrostat for 480 hours under severe conditions of 85 ° C and 85% relative humidity. After the diffusion sheet left at high temperature / high humidity was assembled together with the blue light emitting module, the light guide plate, the first and the second light collecting sheet, the final luminance and the final color coordinate thereof were measured. The results are shown in Table 5.

The initial / final luminance and the initial / final color coordinates are values measured at nine points of the display area in which the light guide plate, the diffusion sheet, and the first and second light collecting sheets are laminated, except for the portion where the light source is disposed among the backlight units. Mean value of these. The nine points were designated as shown in FIG.

In FIG. 12, the light source is represented by LS, and the display area in which the light guide plate, the diffusion sheet, and the first and second light collecting sheets are stacked is represented by DS, and points 1, 2, and adjacent to the light source LS of the display area DS are shown. 3 becomes a light-receiving portion, and points 7, 8 and 9 opposite to the light-receiving portion become large light portions. When the horizontal length of the display area DS is called a and the vertical length is b, each of the

points

1, 2, and 3 is spaced apart by a / 6 from the first edge of the display area DS adjacent to the light incident portion. , Points 7, 8 and 9 are spaced apart a / 6 from the second edge of the display area DS corresponding to the light portion. Also, points 1, 4 and 7 are respectively spaced apart by b / 6 from the third edge connecting the first and second edges, and points 3, 6 and 9 are respectively b from the fourth edge facing the third edge. / 6 apart Points 1, 2 and 3 are each spaced a / 3 with each of

points

4, 5 and 6, and points 4, 5 and 6 are each spaced a / 3 with each of points 7, 8 and 9, respectively. At the same time, points 1, 4 and 7 are each spaced b / 3 with

points

2, 5 and 8 respectively and points 2, 5 and 8 are spaced apart by

points

3, 6 and 9 and b / 3 respectively.

In Tables 4 and 5, the initial / final color coordinates are shown based on the CIE 1931 color coordinate system.

자외선 안정성 테스트 결과UV stability test results

Table 4

Backlight classification	Initial luminance (cd / m ² )	Initial color coordinates (CIE 1931)	Final brightness (cd / m ² )	Final color coordinates (CIE 1931)
Example 7	6,207	(0.268, 0.273)	6,052	(0.267, 0.271)
Comparative Example 8	3,502	(0.248, 0.199)	1,885	(0.225, 0.164)

Referring to Table 4, the initial luminance of the backlight unit according to the seventh embodiment of the present invention is about 6,207 cd / m ² , compared with the initial luminance of the backlight unit according to Comparative Example 8 is about 3,502 cd / m ² , It can be seen that the value is about 1.77 times higher. In particular, the final luminance measured after the harsh conditions of ultraviolet rays applied to the backlight unit according to the seventh embodiment of the present invention is reduced by about 150 cd / m ² compared to the initial luminance, while the final luminance of the backlight unit according to Comparative Example 8 is It can be seen that the decrease of about 1,617 cd / m ² is reduced to almost half of the initial luminance.

In addition, in the initial color coordinates and the final color coordinates of the backlight unit according to the seventh embodiment of the present invention, the difference (x) of the x coordinate is about 0.001 and the difference (y) of the y coordinate is about 0.002. It can be seen that the difference? X between the initial color coordinate and the final color coordinate of the backlight unit is 0.023 and the difference? Y of the y coordinate is about 0.035.

열/수분 안정성 테스트 결과Thermal / moisture stability test results

Table 5

Backlight classification	Initial luminance (cd / m ² )	Initial color coordinates (CIE 1931)	Final brightness (cd / m ² )	Final color coordinates (CIE 1931)
Example 7	6,207	(0.268, 0.273)	6,025	(0.263, 0.267)
Comparative Example 8	3,502	(0.248, 0.199)	1,543	(0.213, 0.155)

Referring to Table 5, the final luminance measured after the harsh conditions of high temperature and high humidity was applied to the backlight unit according to Example 8 of the present invention decreased by about 182 cd / m ² compared to the initial luminance, while the backlight according to Comparative Example 8 It can be seen that the final luminance of the unit is reduced by about 1,959 cd / m ^{2, which} is reduced to almost half of the initial luminance.

Further, in the initial color coordinates and the final color coordinates of the backlight unit according to the eighth embodiment of the present invention, the difference (x) of the x coordinate is about 0.005 and the difference (y) of the y coordinate is about 0.006. It can be seen that the difference? X between the initial color coordinate and the final color coordinate of the backlight unit is 0.035 and the difference? Y of the y coordinate is about 0.044.

As described above, in consideration of the fact that the nano light emitter is applied to the diffusion sheet of the backlight unit according to Comparative Example 8 and the nanocomposite is applied to the diffusion sheet of the backlight unit according to Example 7 of the present invention, the nanocomposite is diffused Not only is it hardly damaged in the process of manufacturing the sheet, it can be seen that even in the diffusion sheet, the stability against heat, moisture and light is very good compared to the nano light-emitting body.

백라이트 유닛의 제조 (실시예 8 내지 10)Fabrication of Backlight Units (Examples 8 to 10)

[실시예 8]Example 8

(1) Manufacture of light guide plate

0.5 parts by weight of a benzotriazole UV absorber (trade name: Tinuvin-329, BASF, Germany) and a hindered amine light stabilizer (trade name: Tinuvin-770, BASF, Germany) based on 100 parts by weight of the methyl methacrylate polymer. After mixing 0.5 parts by weight, a resin in pellet form was prepared by using an extruder (inner diameter: 27 mm, L / D: 40, Leistritz. Co.), which was extruded using a sheet extruder, and then optically about 0.4 mm thick. Plates were prepared. A light guide plate was prepared by coating a coating composition including a blue nanocomposite on one surface of the optical plate to form an optical layer having a thickness of about 5 μm.

The coating composition, the wax solution was mixed with a solution of about 20 mg of blue nano light emitter (trade name; Nanodot-HE-480, QD solution, Korea) dispersed in 1 ml of toluene and cooled to room temperature, BASF (Company) It was mixed with a urethane acrylate purchased from Myung, Germany) and a photoinitiator (diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide, TPO) purchased from BASF. The photoinitiator was mixed at about 0.8 parts by weight based on 100 parts by weight of urethane acrylate. It was then prepared by removing toluene using an evaporator.

(2) Preparation of Diffusion Sheet

(3) Preparation of the first and second light collecting sheets

(4) manufacture of backlight unit

OE- YAG phosphor (YAG Phosphor) purchased from Nichia (Japan, Japan) was prepared on the blue light emitting chip having the light guide plate, the diffusion sheet, and the first and second light collecting sheets prepared as described above, having a light emission peak at about 444 nm. A backlight unit according to Example 8 of the present invention was prepared by assembling with 6630 silicon resin (trade name, Dow Corning, USA) and then assembly with a white light emitting module prepared by curing. In this case, the optical layer of the light guide plate is disposed on the emission surface of the light provided from the light source.

[실시예 9]Example 9

(1) Manufacture of light guide plate

As a light guide plate, 0.5 weight part of benzotriazole type ultraviolet absorbers (brand name: Tinuvin-329, BASF Corporation, Germany) and a hindered amine light stabilizer (brand name: Tinuvin-770, BASF company) with respect to 100 weight part of methyl methacrylate polymers , Germany) After mixing 0.5 parts by weight, a resin in pellet form was prepared using an extruder (inner diameter: 27 mm, L / D: 40, Leistritz. Co.), which was extruded using a sheet extruder to about 0.4 mm An optical plate of thickness was prepared.

(2) Preparation of Diffusion Sheet

20 mg of a wax (trade name: Licowax PED 136 wax, Clariant, Switzerland) having an acid value of about 30 mg KOH / g as an oxidized high density polyethylene wax (Oxidized HDPE Wax) as a wax-based compound was mixed with 1 ml of toluene. After that, the wax-based compound was dissolved by raising the temperature to about 150 ° C. to prepare a wax solution. A solution containing about 20 mg of CdSe-based blue nano light-emitting body (trade name: Nanodot-HE-480, QD solution, Korea) in 1 ml of toluene was added to the wax solution, mixed, and cooled to room temperature. The urethane acrylate purchased from the company (company name, Germany) and the photoinitiator (diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide, TPO) purchased from BASF were mixed. The photoinitiator was mixed at about 0.8 parts by weight based on 100 parts by weight of urethane acrylate. Then toluene was removed using an evaporator to prepare a coating composition in which urethane acrylate, red nanocomposite and photoinitiator were mixed. The coating composition was coated on a transparent base substrate (trade name: XU42, Toray Industries, Japan) of about 38 μm thickness and cured to form a light diffusion layer having the shape shown in FIG. 4C on its surface. The average thickness of the light diffusion layer was about 50 μm.

(3) Preparation of the first and second light collecting sheets

First and second light collecting sheets were prepared which are substantially the same as described in Example 8.

(4) manufacture of backlight unit

The light guide plate, the diffusion sheet, and the first and second light collecting sheets prepared as described above were assembled with the white light emitting module described in Example 2 to prepare a backlight unit according to Example 9 of the present invention.

[실시예 10]Example 10

(1) Manufacture of light guide plate and diffusion sheet

A light guide plate substantially the same as that described in Example 9 was prepared, and a diffusion sheet substantially the same as that described in Example 8 was prepared.

(2) Production of First Condensing Sheet

(2) Production of Second Condensing Sheet

After forming the light collecting pattern through a process substantially the same as the method of manufacturing the first light collecting sheet, the blue nanocomposite, the polyurethane acrylate and the photoinitiator described in Example 9 on the opposite side of the PET film having the light collecting pattern ( coating and curing a coating composition comprising diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide (TPO) to form an optical layer having the shape shown in FIG. A light collecting sheet was prepared.

(3) Manufacture of backlight unit

The light guide plate, the diffusion sheet, and the first and second light collecting sheets prepared as described above were assembled with the white light emitting module to prepare a backlight unit according to the tenth embodiment of the present invention.

[실험 5]- 색좌표 균일도 평가[Experiment 5]-Evaluation of color coordinate uniformity

For each of the backlight unit according to Comparative Example 1 and the backlight unit according to Examples 8 to 10 of the present invention, color coordinates at each of nine points of the backlight unit were measured as shown in FIG. 12. The results are shown in Table 6.

In Table 6, Δx is the difference between the maximum value and the minimum value of the x coordinate among the points 1 to 9, and Δy represents the difference between the maximum value and the minimum value of the y coordinate among the points 1 to 9.

Table 6

Point	Comparative Example 1	Example 8	Example 9	Example 10
Point	Color coordinates (x, y)
One	(0.297, 0.283)	(0.295, 0.282)	(0.295, 0.281)	(0.294, 0.281)
2	(0.296, 0.281)	(0.297, 0.283)	(0.295, 0.281)	(0.293, 0.278)
3	(0.298, 0.283)	(0.299, 0.286)	(0.299, 0.285)	(0.296, 0.281)
4	(0.302, 0.290)	(0.294, 0.283)	(0.292, 0.282)	(0.289, 0.278)
5	(0.301, 0.288)	(0.296, 0.284)	(0.294, 0.282)	(0.291, 0.279)
6	(0.303, 0.289)	(0.299, 0.287)	(0.297, 0.285)	(0.293, 0.280)
7	(0.311, 0.303)	(0.295, 0.287)	(0.293, 0.286)	(0.289, 0.281)
8	(0.312, 0.303)	(0.296, 0.287)	(0.293, 0.284)	(0.291, 0.281)
9	(0.314, 0.304)	(0.298, 0.288)	(0.295, 0.285)	(0.292, 0.283)
Δx	0.018	0.004	0.007	0.007
△ y	0.023	0.006	0.004	0.005

Referring to Table 6, in the backlight unit according to Comparative Example 1, the x- and y-coordinates are closer to the light source, that is, the color coordinates of points 1 to 3 than the color coordinates of points 5 to 9, which are light facing parts facing the light incident part. It can be seen that both have small values. On the other hand, in the backlight units according to embodiments 7 to 9 of the present invention, it can be seen that the color coordinates of the points 1 to 3 are substantially the same as the color coordinates of the points 7 to 9. That is, in the backlight units according to the seventh to seventh exemplary embodiments of the present invention, it can be seen that there is almost no difference in color coordinates between the light incident portion and the light facing portion.

Referring to Δx and Δy, it can be seen that the values in the backlight units according to Examples 7 to 9 are significantly lower than those in Comparative Example 1. That is, in the backlight unit according to Comparative Example 1, the observer may recognize the light portion as yellow relative to the light incident portion due to the difference in the color coordinates of the light incident portion and the light facing portion. However, it can be seen that the color coordinate difference of the points 1 to 9 is significantly reduced by the optical sheet including the blue nanocomposite as in the backlight units according to Examples 7 to 9. Accordingly, by applying the blue nanocomposite to at least one of the diffusion sheet, the light guide plate, and the light collecting sheet, the color coordinates of the backlight unit may be uniformly adjusted as a whole.

While the foregoing has been described with reference to preferred embodiments of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be appreciated.

Claims

Wax particles;

At least one nano light-emitting body disposed inside the wax particle; And

A nanocomposite covering the nano light-emitting body and including an inner protective film formed of silicon oxide.
The nanocomposite of claim 1, wherein the inner protective layer covers one nano light-emitting body.
The nanocomposite of claim 2, wherein the nano light emitters disposed in the wax particles have light emission peaks in the same wavelength band.
The nanocomposite of claim 2, wherein at least two of the nano light emitters disposed in the wax particles have light emission peaks in different wavelength bands.
The nanocomposite of claim 1, wherein the inner protective layer covers at least two nano light emitters.
The method of claim 5, wherein each of the nano light emitters,

Nanocomposites having light emission peaks in the same wavelength band.
The method of claim 5, wherein at least two of the nano light emitters are

Nanocomposite having a light emission peak in different wavelength bands.
The nanocomposite of claim 1, further comprising an outer protective film covering the surface of the wax particles and formed of silicon oxide.
The nanocomposite of claim 8, further comprising a wax layer formed on a surface of the outer protective film and including a wax compound.
Wax particles;

At least one nano light-emitting body disposed inside the wax particle; And

A nanocomposite covering the surface of the wax particles and including an outer protective film formed of silicon oxide.
The nanocomposite of claim 10, wherein at least two of the nano light emitters disposed in the wax particle have light emission peaks in different wavelength bands.
The nanocomposite of claim 10, further comprising a wax layer formed on a surface of the outer protective film and including a wax compound.
Base substrate; And

A first optical layer disposed on one surface of the base substrate and having at least one first nanocomposite dispersed therein;

The first nanocomposite,

First wax particles; And

An optical member comprising at least one first nano light-emitting body disposed inside the first wax particles.
The method of claim 13, further comprising: a second optical layer disposed on the other surface of the base substrate opposite to the one surface, wherein at least one second nanocomposite is dispersed;

The second nanocomposite,

Second wax particles; And

And at least one second nano light-emitting body disposed inside the second wax particle.
15. The method of claim 13 or 14, further comprising a third optical layer disposed on the first optical layer, at least one third nanocomposite is dispersed,

The third nanocomposite,

Third wax particles; And

And at least one third nano light-emitting body disposed within the third wax particles.
15. The optical member according to claim 13 or 14, wherein at least one of the first and second nano light emitters is coated with an inner protective film formed of silicon oxide.
The optical member according to claim 13 or 14, wherein at least one of the first and second wax particles is coated with an outer protective film formed of silicon oxide.
The optical member according to claim 15, wherein at least one of the first to third wax particles is coated with an outer protective film formed of silicon oxide.
The method of claim 17, wherein at least one of the first and second nanocomposites is

And an wax layer covering the outer protective layer and formed of a wax-based compound.
The method of claim 18, wherein at least one of the first to third nanocomposites,

And an wax layer covering the outer protective layer and formed of a wax-based compound.
The optical member of claim 13 or 14, wherein at least one of the first and second optical layers comprises an optical pattern.
The optical member of claim 15, wherein at least one of the first to third optical layers comprises an optical pattern.
The method of claim 13, wherein the first optical layer comprises a plurality of first nanocomposites, each of the first wax particles included in each of the first nanocomposites.

Red nano light emitter;

Green nano light emitters; And

At least one selected from among blue nano light-emitting bodies is disposed.
The optical member according to claim 13, further comprising a light diffusion layer formed on the first optical layer.
The optical member according to claim 14, further comprising a light diffusion layer formed on the second optical layer.
Base substrate; And

A first optical layer formed on one surface of the base substrate, including at least one first nanocomposite, and having a light diffusion pattern formed on a surface thereof;

The first nanocomposite,

First wax particles; And

A diffusion sheet comprising at least one first nano light-emitting body disposed inside the first wax particles.
27. The diffusion sheet of claim 26, wherein the plurality of first nano light-emitting bodies included in the first wax particles have emission peaks in the same wavelength band.
27. The diffusion sheet of claim 26, wherein at least two first nano light-emitting bodies included in the first wax particles have emission peaks in different wavelength bands.
27. The method of claim 26, further comprising a second optical layer disposed on the other surface opposite the one surface and including at least one second nanocomposite,

The second nanocomposite,

Second wax particles; And

And at least one second nano light-emitting body disposed inside the second wax particle.
30. The diffusion sheet of claim 29, wherein the plurality of second nano light emitters included in the second wax particles have emission peaks in the same wavelength band.
30. The diffusion sheet of claim 29, wherein at least two second nano light emitters included in the second wax particles have emission peaks in different wavelength bands.
30. The diffusion sheet of claim 29, wherein a light diffusion pattern is formed on a surface of the second optical layer.
30. The diffusion sheet of claim 29, wherein the peak wavelength of light generated by the first nano light emitter is longer than the peak wavelength of light generated by the second nano light emitter.
The diffusion sheet of claim 33, wherein the first nano light emitter has an emission peak at 600 nm to 660 nm, and the second nano light emitter has an emission peak at 520 nm to 560 nm.
30. The method of claim 29, further comprising an intermediate layer disposed between the base substrate and the second optical layer and comprising at least one third nanocomposite,

The third nanocomposite is

Third wax particles; And

And at least one third nano light-emitting body disposed inside the third wax particle.
27. The method of claim 26, further comprising an intermediate layer disposed between the base substrate and the first optical layer and comprising at least one third nanocomposite,

The third nanocomposite,

Third wax particles; And

And at least one third nano light-emitting body disposed inside the third wax particle.
27. The diffusion sheet of claim 26, further comprising a second optical layer disposed on the other surface of the base substrate opposite the one surface and having a light collecting pattern formed on a surface thereof.
Base substrate;

A light diffusion layer formed on one surface of the base substrate; And

A first optical layer formed on the other surface of the base substrate facing the one surface and including at least one first nanocomposite,

The first nanocomposite,

First wax particles; And

A diffusion sheet comprising at least one first nano light-emitting body disposed inside the first wax particles.
The diffusion sheet of claim 38, wherein the plurality of first nano light-emitting bodies included in the first wax particles have emission peaks in the same wavelength band.
40. The method of claim 38 or 39, further comprising a second optical layer disposed on the first optical layer and comprising at least one second nanocomposite,

The second nanocomposite,

Second wax particles; And

A diffusion sheet comprising at least one second nano light-emitting body disposed inside the second wax particles.
41. The diffusion sheet of claim 40, wherein the first nano light emitter and the second nano light emitter have emission peaks in different wavelength bands.
39. The diffusion sheet of claim 38, further comprising a light diffusion layer formed on the first optical layer.
Base substrate; And

Condensing sheet including a light collecting pattern disposed on the base substrate, including a nanocomposite including at least one nano light emitter disposed inside the wax particles.
Base substrate;

A light collecting pattern disposed on one surface of the base substrate; And

An optical layer including a nanocomposite disposed on the other surface of the base substrate facing the one surface;

The nanocomposite is a wax particle; And

Condensing sheet including at least one nano light-emitting body disposed inside the wax particles.
The light collecting sheet according to claim 44, wherein a light diffusion pattern is formed on the surface of the optical layer.
Light source;

A diffusion sheet to receive light from the light source; And

A light collecting sheet disposed on the diffusion sheet,

At least one of the diffusion sheet and the light collecting sheet,

Wax particles; And

And at least one nanocomposite including at least one nano light emitter disposed inside the wax particle.
47. The backlight unit of claim 46, wherein the light source comprises a blue light emitting module.
47. The method of claim 46, wherein the wax particles of each of the plurality of nanocomposites are

Red nano light emitter; And

A backlight unit comprising at least one selected from the green nano light emitting body.