WO2014073894A1

WO2014073894A1 - Optical sheet and backlight unit comprising same

Info

Publication number: WO2014073894A1
Application number: PCT/KR2013/010093
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

In an optical sheet and a backlight unit comprising same, the optical sheet comprises: a first transparent film; a first barrier layer; and an optical conversion layer, wherein the first barrier layer is formed on one surface of the first transparent film, the light conversion layer is formed on top of the first barrier layer, and wherein at least one of a wax particle, a light-emitting composite including a nano light-emitting body that is arranged inside the wax particle, and a fluorescent particle is dispersed.

Description

Optical sheet and backlight unit including same

The present invention relates to an optical sheet and a backlight unit including the same, and more particularly, to an optical sheet for a display device and a backlight unit including the same.

Nanoluminescent materials, 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 a nano light-emitting body formed of the same material is smaller the size of the band gap (band gap), the light emission characteristics are different according to the size of the nano light-emitting body. 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 is controlled and used in various light emitting devices and electronic devices.

However, since the nano light-emitting body is very vulnerable to ultraviolet rays, heat, moisture, etc., when the nano light-emitting body is applied to an electronic device, there is a problem that the life of the electronic device is shortened. In particular, in a film or sheet including a nano light-emitting body, various methods for protecting the nano light-emitting body from ultraviolet rays, heat, moisture, and the like have been proposed, but there is a limit in blocking the ingress of moisture into the film or sheet.

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 broad emission spectrum covering 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. In addition, the color reproducibility of the display device using the white light source to which the phosphor is applied is low.

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 an optical sheet having improved stability against ultraviolet rays, heat, moisture and the like.

Another object of the present invention is to provide a backlight unit for improving color reproducibility of a display device by using the optical sheet.

An optical sheet according to an embodiment of the present invention includes a first transparent film, a first barrier layer, and a light conversion layer. The first barrier layer is formed on one surface of the first transparent film. The light conversion layer is formed on the first barrier layer, and at least one selected from a light emitting composite including a wax particle and a nano light emitting body disposed inside the wax particle and fluorescent particles is dispersed.

In one embodiment, the optical sheet may further include a second barrier layer disposed on the light conversion layer.

In one embodiment, the optical sheet may further include a second transparent film disposed on the second barrier layer.

In an embodiment, the optical sheet may further include an optical layer formed on one surface of the first transparent film and having a light diffusion pattern or a buffer pattern formed on the surface thereof.

In an embodiment, the optical sheet may further include an optical layer formed on one surface of the first transparent film and having a light collecting pattern or a buffer pattern formed on the surface thereof.

In one embodiment, the light emitting composite may be a red light emitting composite in which the nano light emitting body is a red nano light emitting body.

In one embodiment, the nano light-emitting body includes a red nano light-emitting body and a green nano light-emitting body, the light emitting composite may be a multi-color light emitting composite in which the wax particles cover the red and green nano light emitting bodies.

In one embodiment, the wax particles may include first wax particles and second wax particles, and the nano light emitter may include at least one red nano light emitter and at least one green nano light emitter. In this case, the light emitting composite includes a red light emitting composite including the first wax particles and the at least one red nanoluminescent body disposed inside the first wax particles, and the second wax particles and the second wax particles. It may include a green light emitting composite including the at least one green nano light emitting body disposed therein.

In one embodiment, the fluorescent particles may include a green phosphor.

In one embodiment, the fluorescent particles may include a green fluorescent composite comprising a third wax particle and at least one green phosphor disposed inside the third wax particle.

In one embodiment, the wax particles may include first wax particles and second wax particles, and the nano light emitter may include at least one red nano light emitter and at least one green nano light emitter. In this case, the light emitting composite includes a red light emitting composite including the first nanoparticle and the red nanolight emitting body disposed inside the first wax particle, and the second wax particle and the green disposed inside the second wax particle. It may include a green light emitting composite including a nano light emitting body.

The light conversion layer may include a first light conversion layer formed on the first barrier layer, and a second light conversion layer disposed between the second barrier layer and the first light conversion layer. have.

In example embodiments, the light conversion layer may further include an adhesive layer interposed between the first light conversion layer and the second light conversion layer and adhering to the first light conversion layer and the second light conversion layer. have.

In one embodiment, the adhesive layer may include a moisture absorbent.

According to another embodiment of the present invention, a backlight unit includes a light emitting device, a light guide plate receiving light generated by the light emitting device, and an optical sheet disposed on the light guide plate, wherein the optical sheet includes a first transparent film and a first barrier. Layer and light conversion layer. The first barrier layer is formed on one surface of the first transparent film. The light conversion layer is formed on the first barrier layer, and at least one selected from a light emitting composite including a wax particle and a nano light emitting body disposed inside the wax particle and fluorescent particles is dispersed.

In one embodiment, the light emitting composite includes a red light emitting composite wherein the nano light emitting body is a red nano light emitting body, the light emitting device includes a blue light emitting chip and a light conversion layer covering the blue light emitting chip, the light conversion layer May comprise a green phosphor or a green phosphor complex.

In one embodiment, the light conversion layer includes both the light emitting composite and the fluorescent particles, the light emitting device may include a blue light emitting device for emitting blue light. Alternatively, the light emitting device may be a white light emitting device including a blue light emitting chip and a light conversion layer covering the blue light emitting chip.

In one embodiment, the wax particles include a first wax particle and a second wax particle, and the nano light emitter is a red nano light emitting body disposed in the first wax particles and a green nano light emitting body disposed in the second wax particles. The light conversion layer may include a red light emitting composite including the first wax particles and the red nano light emitting body, and a green light emitting composite including the second wax particles and the green nano light emitting body. In this case, the light emitting device may be a blue light emitting device.

According to the optical sheet and the backlight unit including the optical sheet of the present invention, the optical sheet is a light emitting composite or fluorescent particles dispersed with a light emitting composite or fluorescent particles having high stability against light, moisture and / or heat in an external environment, etc. By including a barrier layer protecting the conversion layer itself, it is possible to remarkably improve light stability and moisture / thermal stability.

In addition, by using the optical sheet, not only the color reproduction area of the display device may be increased, but also the color purity and color reproduction of the color displayed by the display device may be improved.

1 is a cross-sectional view for describing a backlight unit according to an exemplary embodiment of the present invention.

FIG. 2 is a cross-sectional view of the diffusion sheet shown in FIG. 1.

3 is a plan view illustrating an example of a light diffusion pattern formed on a surface of the first optical layer of FIG. 2.

4A to 4C and 5A to 5C are cross-sectional views illustrating various structures of the light emitting composite dispersed in the light conversion layer of FIG. 2.

FIG. 6 is a partially enlarged cross-sectional view illustrating a structure of the first barrier layer of FIG. 2.

7 is a cross-sectional view of a diffusion sheet according to another embodiment of the present invention.

FIG. 8 is a cross-sectional view for describing a fluorescent composite dispersed in the light conversion layer of FIG. 7.

9 is a cross-sectional view for describing a diffusion sheet according to another embodiment of the present invention.

10 is a cross-sectional view for describing a diffusion sheet according to still another embodiment of the present invention.

11 is a cross-sectional view for describing a diffusion sheet according to still another embodiment of the present invention.

12 is a cross-sectional view for describing a backlight unit according to still another embodiment of the present invention.

FIG. 13 is a cross-sectional view for describing the light conversion sheet of FIG. 12.

14 is a cross-sectional view for describing a backlight unit according to still another embodiment of the present invention.

FIG. 15 is a cross-sectional view for describing the first light collecting sheet of FIG. 14.

16 is a cross-sectional view for describing a backlight unit according to yet another exemplary embodiment of the present invention.

17 is a cross-sectional view for describing the light collecting sheet of FIG. 16.

18 is a cross-sectional view for describing a backlight unit according to yet another exemplary embodiment of the present invention.

19 is a diagram for describing 24 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, "wax-based compound" refers to an organic compound having a melting point (melting point) higher than room temperature in the solid state at room temperature, "wax particles" is formed by the recrystallization of the wax-based compound And shaped or amorphous particles that physically constitute a monolith. "Normal temperature" here means a temperature in the range of about 15 ° C to about 25 ° C. In addition, in the present invention, the term "luminescence" refers to a state in which the excited state falls off from the ground state to the excited state after the electrons in the material are transitioned from the ground state to the ground state by the external stimulus. Means a phenomenon of emitting light corresponding to the difference in energy between.

In addition, in the present invention, "luminescent complex" means a complex including wax particles together with a nanoluminescent body. And “red light emitting complex” means a light emitting complex including only a red nano light emitting body as a nano light emitting body, and “green light emitting complex” refers to a light emitting complex including only green nano light emitting material as a nano light emitting body, and “multicolor light emitting complex” refers to a nano light emitting material. It refers to a light emitting composite comprising a red nano light emitting material and a green nano light emitting material as a light emitting body.

In the present invention, "fluorescent particle" is defined as a concept including not only the phosphor itself, but also a fluorescent complex including wax particles together with the phosphor. That is, the "green fluorescent particle" is a concept that includes not only the green phosphor itself, but also a green fluorescent composite including wax particles together with the green phosphor.

Hereinafter, "red nanolumines" refers to nanolumines having emission peaks in the red wavelength range of about 600 nm to about 660 nm, and "green nanolumines" refers to emission peaks in the green wavelength range of about 520 nm to about 560 nm. It is a general term for the nano-luminescent body which has. "Green phosphor" is also generic to phosphors having emission peaks in the green wavelength band of about 520 nm to about 560 nm.

On the other hand, light whose peak wavelength in the emission spectrum belongs to the red wavelength band is referred to as "red light", and light belonging to the green wavelength band is referred to as "green light". In addition, the light whose peak wavelength in the emission spectrum belongs to a wavelength band of about 430 nm to about 470 nm is described as "blue light".

Referring to FIG. 1, the backlight unit 1000 may include a light emitting device 1100, a light guide plate 1200, a reflecting plate 1300, a diffusion sheet 1400, a first light collecting sheet 1500, and a second light collecting sheet 1600. Include.

The light emitting device 1100 generates light and emits the light toward the light guide plate 1200.

As an example, the light emitting device 1100 may be a white light emitting device that emits white light. The white light emitting device may include a blue light emitting chip that generates blue light, and a light conversion layer covering the blue light emitting chip. The light conversion layer absorbs a part of the blue light generated by the blue light emitting chip and converts the light into red light and green light so that the white light emitting device finally emits white light. The light conversion layer may include a phosphor including a Yttrium aluminum garnet (YAG). Alternatively, the light conversion layer may include a nano light-emitting body including a quantum dot.

As another example, the light emitting device 1100 may be a blue light emitting device emitting blue light. The blue light emitting device may include a blue light emitting chip that generates blue light, and blue light generated by the blue light emitting chip may be emitted to the outside of the light emitting device 1100 to provide blue light to the light guide plate 1200.

The blue light emitting chip of the light emitting device 1100 includes a light emitting diode that generates blue light. The light emitting diode may include a nitride compound. The nitride compound may include at least one nitride selected from indium (In), gallium (Ga), and aluminum (Al). For example, the nitride compound may be represented by "In _i Ga _j Al _k N", where 0≤i, 0≤j, 0≤k, and i + j + k = 1.

For example, the light emitting diode may have a stacked structure of an n-type semiconductor layer, an active layer, and a p-type semiconductor layer, each of which includes the nitride compound. The n-type semiconductor layer may be doped with n-type impurities, the p-type semiconductor layer may be doped with p-type impurities, and the active layer may be an undoped layer. As a specific example, the light emitting diode is an n-type semiconductor layer having a GaN / AlGaN double layer structure doped with n-type impurities, an active layer composed of InGaN, and a p-type semiconductor layer having a double layer structure of GaN / AlGaN doped with p-type impurities. It may have a stacked structure.

The emission spectrum of the blue light generated by the light emitting diode may have a half width (FWHM) of about 50 nm or less. Preferably, the emission spectrum of the blue light may have a half width of about 30 nm or less.

As another example, the light emitting device 1100 may include the blue light emitting chip and a green light emitting layer covering an upper portion of the blue light emitting chip. The green light emitting layer includes green particles, green dyes, or pigments that absorb blue light provided from the blue light emitting chip to emit green light. The green particles may include at least one selected from a green nano light emitting body, a green light emitting composite, a green phosphor, and a green fluorescent composite. As the green dye or pigment, a conventionally known compound may be used. Each of the green nano light emitting body, the green phosphor, the green light emitting composite, and the green fluorescent composite is substantially the same as those applied to the diffusion sheet 1400 described below with reference to FIG. 2, and will be described below with reference to the accompanying drawings. .

The light guide plate 1200 is disposed adjacent to the light emitting device 1100. Light generated by the light emitting device 1100 may be incident to the light guide plate 1200, and light emitted from the light guide plate 1200 may be incident to the diffusion sheet 1400.

The reflective plate 1300 is disposed under the light guide plate 1200. The reflective plate 1300 may increase light utilization efficiency by reflecting light leaking to the lower portion of the light guide plate 1200 back to the light guide plate 1200.

The diffusion sheet 1400 may be disposed on the light guide plate 1200 to diffuse light emitted from the light guide plate 1200. The diffusion sheet 1400 will be described later in detail with reference to FIG. 2.

The first light collecting sheet 1500 is disposed on the diffusion sheet 1400, and a first light collecting pattern including a plurality of protrusions is formed on a surface of the first light collecting sheet 1500. The first condensing pattern faces the second condensing sheet 1600. The second light collecting sheet 1600 is disposed on the first light collecting sheet 1500 and has a shape substantially the same as a protrusion formed on the first light collecting sheet 1500 on the surface of the second light collecting sheet 1600. A second condensing pattern including a plurality of protrusions having is formed. The second condensing pattern faces the display panel on the backlight unit 1000. The length direction of the protrusion of the first condensing pattern and the length direction of the protrusion of the second condensing pattern may cross each other. In this case, an angle at which the protrusions cross in the longitudinal direction may be about 90 °.

Hereinafter, the diffusion sheet 1400 described in FIG. 1 will be described in detail with reference to FIGS. 2, 3, 4A to 4C, and 5A to 5C.

2 is a cross-sectional view of the diffusion sheet illustrated in FIG. 1, and FIG. 3 is a plan view illustrating an example of a light diffusion pattern formed on the surface of the first optical layer of FIG. 2.

2 and 3 together with FIG. 1, the diffusion sheet 1400 may include a first transparent film 1410, a first optical layer 1420, a light conversion layer 1430, and a first barrier layer 1440. And a second barrier layer 1450.

The first transparent film 1410 is a base substrate of the diffusion sheet 1400 that transmits light. The first transparent film 1410 may have a transmittance of about 60% or more with respect to light in the visible light region. For example, the first transparent film 1410 may have a transmittance of about 90% or more with respect to light in the visible light region.

The first transparent film 1410 has flexibility and may be formed of an organic material. Examples of the organic material forming the first transparent film 1410 include polymethylmethacrylate (PMMA), polyethylene terephthalate (PET), polyethersulfone (PES), polycarbonate, PC), polyethylenenaphthalate (PEN), polyimide (PI), polyarylate, cyclic olefin polymer (COP), cyclic olefic copolymer (COC) ), Polyethylene (PE), polypropylene (PP), methacryl (methacrylic), polyurethane (ployurethane) and the like. Alternatively, the first transparent film 1410 may be formed of an epoxy resin.

The first optical layer 1420 is disposed on a first surface of the first transparent film 1410 and includes a light diffusion pattern 1421 formed on a surface of the first optical layer 1420.

For example, the light diffusion pattern 1421 may be a continuous pattern in which a plurality of convex portions are continuously connected. Each of the convex portions protrudes in a direction toward the outside of the diffusion sheet 1400. The heights or widths of the convex portions may be different from each other, and may have irregular values. For example, the protrusion height of the convex portion may be about 1 μm to about 20 μm, and the diameter of the convex portion may be about 1 μm to 40 μm. Here, the diameter of the convex portion is defined as the maximum value of the distances between two points on the edge of the planar projection shape. The height or diameter of the convex portions may be different from each other, and may have an irregular value within the above range. In this case, the convex portion may have a circular shape in planar projection. In contrast, the convex portions may have various shapes such as ellipses or polygons in planar projection, and the convex portions may have different shapes, protruding heights, and diameters.

As a specific example, the light diffusion pattern 1421 may include a plurality of divided regions 1421a (see FIG. 3) in plan view. In the case of planar projection of the light diffusion pattern 1421, the divided regions 1421a may be irregularly arranged in an irregular shape, and the light diffusion pattern 1421 may correspond to each of the divided regions 1421a. It may include a convex portion formed.

As another example, the light diffusion pattern 1421 may be a continuous pattern having 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 diffusion sheet 1400 toward the inside of the diffusion sheet 1400 and the first transparent film 1410. 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. On the contrary, the light diffusion pattern 1421 may have a form in which concave portions and convex portions are continuously combined, or may be embossed patterns.

As another example, the light diffusion pattern 1421 may be a discontinuous pattern. In the discontinuous pattern, the convex portions may have a form in which they are spaced apart from each other, or the concave portions may have a form in which they are spaced apart from each other. The convex portion or the concave portion constituting the discontinuous pattern may have a dot shape when viewed in a plan view. The height, depth, and width of each of the convex portions or the concave portions may have different irregular values.

The light conversion layer 1430 is disposed on the second surface of the first transparent film 1410 opposite to the first surface on which the first optical layer 1420 is formed. The light conversion layer 1430 includes a light transmissive resin 1431 and a light emitting composite 1432 dispersed in the light transmissive resin 1431.

The translucent resin 1431 is a transparent material that transmits light and is cured by light and / or heat to become a substrate for dispersing the light emitting composite 1432. For example, the translucent resin 1431 may include an acrylic resin, a silicone resin, an epoxy resin, a urethane resin, or the like.

The light emitting composite 1432 is dispersed in the light transmissive resin 1431. The light emitting composite 1432 will be described in detail with reference to FIGS. 4A to 4C and 5A to 5C.

Referring to FIG. 4A, the light emitting composite 1432 distributed in the light conversion layer 1430 includes wax particles 110 and at least one nano light emitting body 120 disposed inside the wax particles 110. It may be a light emitting composite 100a having a structure.

The wax particles 110 are made of a wax-based compound. The wax particles 110 may encapsulate the nano light emitting body 120 to prevent the nano light emitting body 120 from being damaged by moisture, heat, or light caused by an external environment. In addition, as the nano light emitting body 120 is positioned inside the wax particle 110, the wax particles 110 may stably disperse the nano light emitting body 120 in the light transmitting resin 1431. In the present invention, "encapsulation" means that the nano light-emitting body 120 is disposed inside the wax particle 110, and the nano light-emitting body 120 is wrapped by the wax particle 110. . In this case, a van der Waals force may act between the nano light emitting body 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-luminescent body 120 as compared with the case of including only the unit 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-luminescent 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, so that the wax particle ( 110 is more advantageous for encapsulating the nanoluminescent body 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-based compound refers to the number of mg of potassium hydroxide (KOH) required to neutralize 1 g of the wax-based 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-luminescent body 120 is very small, which may cause a problem that the nano-luminescent body 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-emitting body 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) The heat resistance of the light emitting composite (100a) including may be improved. In addition, since the high density wax-based compound has better crystallinity than the low-density wax-based compound when recrystallized, 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 about 80 ° C to about 110 ° C. Therefore, the wax particles 110 may further improve the heat resistance of the light emitting composite 100a according to the embodiment of the present invention rather than being formed of HDPE wax from LDPE wax.

The wax particles 110 may be formed of a wax-based compound having a weight-average molecular weight of about 1,000 to 20,000. In the present invention, "weight average molecular weight" means an average molecular weight obtained by averaging the molecular weights of the molecular weights of the component molecular species of the polymer compound having a molecular weight distribution in a weight fraction. When the weight average molecular weight of the wax-based compound is less than about 1,000, since the wax-based compound is difficult 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 wax compound. 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 ° C 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 emitting body 120, a known nano light emitting body may be used without limitation. For example, as the nano light emitting body 120, a nano light emitting body including a center particle and a ligand bound to the surface of the center particle may be used.

The central particle may be composed of a Group II-VI compound, a Group II-V compound, a Group III-V compound, a Group III-IV compound, a Group III-VI compound, a Group IV-VI compound, or a mixture thereof. The "mixture" includes not only mixtures mixed, but also all three-component compounds, four-component compounds, and dopants doped in these mixtures.

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. .

In one example, the central particle may have a core / shell structure. Each of the core and the shell of the central particle may be composed of the compounds exemplified above. 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 said central particle has a core / shell structure, the compound which comprises the said shell differs from the compound which comprises the said core. For example, the central particle may be a CdSe / ZnS (core / shell) structure having a core comprising CdSe and a shell comprising ZnS, or an InP / ZnS (core having a core comprising ZnS and a shell comprising ZnS). / Shell) structure.

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

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

Although not shown in the drawings, the central particle may further include a cluster molecule as a seed. The cluster molecule is a compound that functions as a seed in the process of preparing the center particle, and the center particle may be formed by precursors of the compound constituting the center particle growing on the cluster molecule. 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 may prevent the central particles adjacent to each other from aggregation and quenching. The ligand binds to the central particle and may have hydrophobic properties.

As an example of the said ligand, 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, the amine compound, carboxylic acid compound, etc. which have a C6-C30 alkenyl group are mentioned. Alternatively, examples of the ligand include phosphine compounds including trioctylphosphine, triphenolphosphine, t-butylphosphine, and the like; Phosphine oxides such as trioctylphosphine oxide; Pyridine or thiophene etc. are mentioned.

The ligand may include a silane compound having a functional group such as a vinyl group, an aryl group, an acryl group, an amine group, a methacrylate group, an epoxy group, or the like.

The type of the ligand 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 without the ligand.

The light emitting composite 100a according to the embodiment of the present invention may have various shapes, and one light emitting composite 100a may include at least one nano light emitting body 120. For example, one nano light emitter 120 may be disposed in one wax particle 110, or two to tens of millions of nano light emitters 120 may be disposed in one wax particle 110. When the plurality of nano light emitters 120 are disposed in the wax particles 110, the distance between the nano light emitters 120 may be about 0.1 nm to about 10 nm. Specifically, the distance may be about 0.9 nm to about 1.2 nm.

The light emitting complex 100a may have a diameter of about 5 nm to about 50 μm. In the coating composition including the light emitting composite 100a, the diameter of the light emitting composite 100a may be about 0.5 μm to about 10 μm in consideration of the dispersibility of the light emitting composite 100a. The diameter of the light emitting composite 100a is a straight line distance between two points on the surface of the light emitting composite 100a, and a length of an imaginary straight line connecting the two points while passing through the center of gravity of the light emitting composite 100a. to be. However, in the case where the curvature is present on the surface of the light emitting composite 100a or the linear distance varies according to the position of two points such as an egg shape, the diameter of the light emitting composite 100a is the maximum value among the straight distances. it means.

Meanwhile, the plurality of nano light emitting bodies 120 disposed inside one wax particle 110 may have emission peaks in the same wavelength range, specifically, in the red wavelength range. That is, the light emitting composite 100a may be a red light emitting composite including red nano light emitting bodies.

On the contrary, the plurality of nano light-emitting bodies 120 disposed inside one wax particle 110 have emission peaks in the same wavelength band, but the nano light-emitting bodies disposed in each of the at least two wax particles 110 ( 120 may have emission peaks in different wavelength bands. For example, in the light conversion layer 1430, a red light emitting composite in which red nanoluminescent bodies are covered by one wax particle 110 and a green light emitting composite in which green nanolight emitting bodies are covered by one wax particle 110 are included. Can be mixed and dispersed.

Alternatively, the plurality of nano light emitters 120 disposed inside one wax particle 110 may include two or more nano light emitters having emission peaks in different wavelength bands. Specifically, the light emitting composite 100a may be a multicolor light emitting composite in which a plurality of red nano light emitting bodies and a plurality of green nano light emitting bodies are disposed in one wax particle 110.

Referring to FIG. 4B, the light emitting composite 1432 distributed in the light conversion layer 1430 may include wax particles 110, at least one nano light emitting body 120 disposed inside the wax particles 110, and an outer protective film ( Light emitting composite 100b having a structure including 130).

Since the light emitting composite 100b is substantially the same as the light emitting composite 100a illustrated in FIG. 4A except that the light emitting composite 100b further includes the outer protective layer 130, detailed descriptions thereof will be omitted. The light emitting complex 100b may have a diameter of about 50 nm to about 50 μm. The light emitting composite 100b may be a red light emitting composite or a multicolor light emitting composite.

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 is a mixture of wax particles 110, a silicon oxide precursor material, a catalyst material, and water in which the nano light-emitting body 120 is disposed in an organic solvent to 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 include triethoxysilane (HTEOS), tetraethoxysilane (TEOS), methyltriethoxysilane (MTEOS), 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, 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 light emitting composite. 100b can be formed.

For example, when the outer protective layer 130 covers the first wax particles and the second wax particles, red nano light-emitting bodies are disposed on each of the first and second wax particles so that the light emitting composite 100b is red. The light emitting composite can be constructed.

On the other hand, when the outer protective layer 130 covers the first wax particles and the second wax particles, the first nano light emitting body disposed inside the first wax particles is a red nano light emitting body, and the inside of the second wax particles The disposed second nanolighter may be a green nanolighter. Accordingly, the light emitting composite 100b may be a multicolor light emitting composite.

Referring to FIG. 4C, the light emitting composite 1432 distributed in the light conversion layer 1430 includes wax particles 110, at least one nano light emitting body 120, an outer protective layer 130, and a wax layer 140. It may be a light emitting composite 100c having a structure.

Since the light emitting composite 100c is substantially the same as the light emitting composite 100b described with reference to FIG. 4B except for further including the wax layer 140, detailed descriptions thereof will be omitted. The light emitting composite 100c may have a diameter of about 50 nm to about 50 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. 4C, 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. 4B, the outer protective layer 130 covers both the first wax particles having the first nano light-emitting body disposed therein and the second wax particles having the second nano light-emitting body 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 light emitting composites 100b illustrated in FIG. 4B. The wax-based compound constituting the wax layer 140 fills the space between the light emitting complexes 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 light emitting composite 100c may be a red light emitting composite or a green light emitting composite according to the type of the nano light emitting body 120 included therein. In contrast, the light emitting composite 100c may be a multicolor light emitting composite including both a red nano light emitting body and a green nano light emitting body.

Referring to FIG. 5A, the light emitting composite 1432 distributed in the light conversion layer 1430 may include wax particles 210, at least one nano light emitting body 220 disposed inside the wax particles 210, and an inner passivation layer. It may be a light emitting composite 200a having a structure including 230.

Since the wax particles 210 and the nano light emitter 220 are substantially the same as the wax particles 110 and the nano light emitter 120 described with reference to FIG. 4A, detailed descriptions thereof will be omitted. The light emitting complex 200a may have a diameter of about 50 nm to about 50 μm.

The inner passivation layer 230 covers the nano light-emitting body 220. The inner passivation layer 230 directly contacts the surface of the nano light-emitting body 220 to cover the nano light-emitting body 220. In this case, the nano light-emitting bodies 220 disposed in the wax particles 210 may be individually covered by the inner protective layer 230. For example, 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. 4B, detailed descriptions thereof will be omitted. do.

For example, the plurality of nano light emitters 220 disposed in the wax particle 210 may be a red nano light emitter. That is, the light emitting composite 200a may be a red light emitting composite.

Alternatively, the plurality of nano light emitters 220 disposed inside the wax particle 210 may include red nano light emitters and green nano light emitters. That is, the light emitting composite 200a may be a multicolor light emitting composite.

Although not shown in the drawings, the inner passivation layer 230 may cover two or more nano light-emitting bodies 220. When two or more nano light emitters 220 are covered by the inner passivation layer 230, the 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 be a red nano light-emitting body, and the light emitting composite 200a may be a red light emitting composite. On the contrary, the nano light-emitting bodies 220 coated with one inner passivation layer 230 include a red nano light-emitting body and a green nano light-emitting body, and the light emitting composite 200a may be a multicolor light emitting composite.

Meanwhile, when defining two or more nano light-emitting bodies 220 coated by one inner passivation layer 230 as a "light-emitting group", the first light-emitting group composed of red nano light-emitting bodies is formed inside one wax particle 210. And, the second light emitting group consisting of green nano light emitting body may be disposed.

Referring to FIG. 5B, the light emitting composite 1432 distributed in the light conversion layer 1430 includes wax particles 210, at least one nano light emitting body 220, an inner passivation layer 230, and an outer passivation layer 240. It may be a light emitting composite 200b having a structure.

Since the light emitting composite 200b is substantially the same as the light emitting composite 200a described with reference to FIG. 5A except that the light emitting composite 200b further includes the outer protective layer 240, detailed descriptions thereof will be omitted. The diameter of the light emitting composite 200b may be about 50 nm to about 50 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. 4B, detailed descriptions thereof will be omitted. The outer passivation layer 240 may prevent the nano light-emitting body 220 from being damaged by moisture, heat, light, etc. together with the wax particles 210 and the inner passivation layer 230.

In FIG. 5B, 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 passivation layer 240 may cover at least two wax particles 210 disposed adjacent to each other, and the space between the wax particles 210 may be filled with silicon oxide to form a light emitting composite. 200b can be formed.

The light emitting composite 200b may be a red light emitting composite or a green light emitting composite according to the type of the nano light emitting body 220 included therein. Alternatively, the light emitting composite 200b may be a multicolor light emitting composite including both a red nano light emitting body and a green nano light emitting body.

Referring to FIG. 5C, the light emitting composite 1432 distributed in the light conversion layer 1430 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. It may be a light emitting composite 200c having a structure including 250.

Since the light emitting composite 200c is substantially the same as the light emitting composite 200b described with reference to FIG. 5B except for further including the wax layer 250, detailed descriptions thereof will be omitted. The diameter of the light emitting composite 200c may be about 50 nm to about 50 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-based compound constituting the wax layer 250 is substantially the same as the wax-based compound described with reference to FIG. 4A, 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. 5C, 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.

The light emitting composite 200c may be a red light emitting composite or a green light emitting composite according to the type of the nano light emitting body 220 included therein. Alternatively, the light emitting composite 200c may be a multicolor light emitting composite including both a red nano light emitting body and a green nano light emitting body.

Referring back to FIG. 2, the light conversion layer 1430 may further include diffusion beads. The diffusion beads may be formed of polycarbonate (PC), polyethylene (PE, PE), polypropylene (PP), methacrylic resin, polyethylene terephtalate (PET), or the like. . These may each be used alone or in combination of two or more.

The diameter of each of the diffusion beads may be between about 3 μm and about 30 μm. The diameter of each of the diffusion beads refers to the diameter measured by the Dynamic Light Scattering method (DLS method) calculated by the Stokes-Einstein equation for the diffusion coefficient. When the light conversion layer 1430 further includes the diffusion beads, the first optical layer 1420 may be omitted in the diffusion sheet 1400.

The first barrier layer 1440 is disposed between the second surface of the first transparent film 1410 and the light conversion layer 1430. The first barrier layer 1440 may protect the light emitting composite 1432 distributed in the light conversion layer 1430 together with the first transparent film 1410 from heat, light, and moisture. In particular, the first barrier layer 1440 may prevent moisture caused by an external environment from penetrating into the light conversion layer 1430. The first barrier layer 1440 may have a thickness of about 5 nm to about 40 μm.

The first barrier layer 1440 may include an inorganic film made of an inorganic material. Examples of the inorganic material constituting the inorganic film include silicon oxide, silicon nitride, silicon oxynitride, silicon oxycarbide, metal oxide, and metal nitride nitride, metal oxynitride, metal oxycarbide, and the like. These may be used alone or in combination of two or more, respectively. In this case, the metal in the metal oxide, metal nitride, metal oxynitride or metal oxide carbide may include aluminum, titanium, indium, tin, tantalum, zirconium, niobium, and the like, and these metals may be each alone or two or more. This can be used in combination.

The inorganic film may be a physical vapor deposition method such as sputtering deposition, thermal evaporation, electron beam evaporation, plasma-enhanced chemical vapor deposition (PECVD), atomic layer deposition (atomic layer). It can be formed using a chemical vapor deposition method such as deposition, ALD).

For example, the first barrier layer 1440 may have a single layer structure formed of one inorganic layer. In this case, the thickness of the first barrier layer 1440 may be about 5 nm to about 10 μm.

As another example, the first barrier layer 1440 may have a structure in which two or more inorganic films are stacked, or a structure in which an organic film made of an inorganic film and an organic material is stacked. This will be described with reference to FIG. 6.

FIG. 6 is a partially enlarged cross-sectional view for describing a structure of the first barrier layer of FIG. 2.

Referring to FIG. 6, the first barrier layer 1440 may include a first layer 1441 and a second layer 1442. The first layer 1441 may be formed on the first transparent film 1410, and the second layer 1442 may be formed between the first layer 1441 and the light conversion layer 1430. .

For example, each of the first layer 1441 and the second layer 1442 may be an inorganic layer formed of different inorganic materials. For example, the first layer 1441 may be an inorganic film formed of silicon nitride, and the second layer 1442 may be an inorganic film formed of silicon oxide. Alternatively, the first layer 1441 may be an inorganic film formed of silicon oxide, and the second layer 1442 may be an inorganic film formed of silicon nitride.

The first barrier layer 1440 is disposed between the second layer 1442 and the light conversion layer 1430, and a third layer formed of an inorganic material different from the inorganic material forming the second layer 1442. It may further include (not shown). In this case, the third layer may be formed of an inorganic material substantially the same as the first layer (1441), or may be formed of an inorganic material different from the first layer (1441).

As another example, the first layer 1441 may be an inorganic layer, and the second layer 1442 may be an organic layer formed of an organic material. In this case, the thickness of the first barrier layer 1440 may be about 5 nm to about 40 μm. When the second layer 1442, which is an organic film, is bonded to the light conversion layer 1430, a gap between the first barrier layer 1440 and the light conversion layer 1430 by the second layer 1442. Adhesion can be improved. The second layer 1442, which is an organic layer, may be formed to have a thickness of about 0.5 μm to about 30 μm to assist the barrier function of the first barrier layer 1440. Alternatively, the second layer 1442, which is an organic layer, may be formed to a thickness of about 0.5 μm or less in order to simply increase the adhesion between the first layer 1441 and the light conversion layer 1430.

Examples of the organic material constituting the organic film include acrylic polymer resin, epoxy polymer resin, silicone polymer resin, urethane polymer resin, parylene, polyethylene terephthalate (PET), polymethyl methacrylate (polymethylmethacrylate, PMMA). ), Polyethersulfone (PES), polycarbonate (PC), polyethylenenaphthalate (PEN), polyimide (PI), polyarylate, cyclic olefin polymer (cyclic olefin) polymer, COP), cyclic olefin copolymer (cyclic olefic copolymer, COC), polyethylene (PE, PE), polypropylene (PP), methacryl (methacrylic) and the like.

The organic film may be formed by applying a curable resin to a substrate through a printing process or a coating process, and curing it using heat and / or light. The curable resin may include a photocuring agent or a catalyst together with a curable monomer or a polymer (copolymer). In this case, the curable resin may be a printing process such as ink-jetting, pad printing, screen printing, spin-coating, tape casting, slot-die, or the like. ) Can be applied to the substrate through a coating process such as coating, gravure coating, offset coating, spray coating and the like. Alternatively, the organic film may be formed by applying to the substrate and curing the PECVD or PVD method. Alternatively, the organic layer may be attached to the inorganic layer in the form of a transparent film.

When the first layer 1441 is an inorganic layer and the second layer 1442 is an organic layer, the first barrier layer 1440 is between the second layer 1442 and the light conversion layer 1430. It may further comprise a third layer (not shown) disposed and formed of an inorganic material. The third layer may be formed of substantially the same inorganic material as the first layer 1441, or may be formed of another inorganic material.

As another example, the first layer 1442 may be an organic layer, and the second layer 1442 may be an inorganic layer. For example, the first layer 1441 may include an acrylic polymer resin, and the second layer 1442 may include aluminum oxide, for example, alumina. Alternatively, the first layer 1441 may include hexamethyldisiloxane or parylene, and the second layer 1442 may include aluminum oxide.

When the first layer 1441 is an organic layer and the second layer 1442 is an inorganic layer, the first barrier layer 1440 is between the second layer 1442 and the light conversion layer 1430. It may further include a third layer (not shown) disposed and formed of an organic material. The third layer may be formed of an organic material substantially the same as the first layer 1441, or may be formed of another kind of organic material.

As another example, the first barrier layer 1440 may have a structure in which these units are repeatedly stacked using a combination of the first and

second layers

1442 and 1442 described above as a unit. In this case, the first barrier layer 1440 is disposed between the repeating stacked structure and the light conversion layer 1430 and corresponds to a combination of the first and second layers 1441 and 1442 described above. It may further include.

Although the first barrier layer 1440 has been described with reference to FIG. 6, the structure of the first barrier layer 1440 is not limited thereto and may have various structures.

Referring back to FIG. 2, the second barrier layer 1450 is disposed on the light conversion layer 1430. That is, the light conversion layer 1430 is disposed between the first barrier layer 1440 and the second barrier layer 1450. The second barrier layer 1450 may have a single inorganic film structure, or may have a structure in which two or more inorganic films are stacked. Alternatively, the second barrier layer 1450 may have a structure in which an organic layer and an inorganic layer are sequentially stacked from the light conversion layer 1430, or a structure in which an inorganic layer and an organic layer are sequentially stacked. The structure of the second barrier layer 1450 may be the same as that of the first barrier layer 1440 or may have a different stacked structure. In this case, each of the inorganic layer and the organic layer constituting the second barrier layer 1450 is substantially the same as that described in the first barrier layer 1440, and thus detailed descriptions thereof will be omitted.

The diffusion sheet 1400 includes the light guide plate 1200 such that the first optical layer 1420 faces the light guide plate 1200 and the second barrier layer 1450 faces the first light collection sheet 1500. ) And the first light collecting sheet 1500 may be disposed. In contrast, the diffusion sheet 1400 may include the light guide plate such that the second barrier layer 1450 faces the light guide plate 1200 and the first optical layer 1420 faces the first light collecting sheet 1500. 1200 may be disposed between the first light collecting sheet 1500.

The backlight unit 1000 described above uses the diffusion sheet 1400 including the light conversion layer 1430 to widen the color reproduction area of the display device and to improve the color purity and color reproducibility of colors displayed by the display device. Can be. In this case, the light conversion layer 1430 uses the light emitting composite 1432 having high stability against light, moisture, and / or heat in an external environment, and protects the first and

second barrier layers

1440 and 1450. By using the light stability and the moisture / thermal stability of the diffusion sheet 1400 can be significantly improved.

Hereinafter, backlight units according to other exemplary embodiments of the present invention will be described with reference to FIGS. 7 to 11. Each of the backlight units according to other exemplary embodiments of the present disclosure is substantially the same as the backlight unit described with reference to FIG. 1 except for the diffusion sheet, and thus descriptions thereof will not be repeated.

7 is a cross-sectional view of a diffusion sheet according to another exemplary embodiment of the present invention, and FIG. 8 is a cross-sectional view illustrating a fluorescent composite dispersed in the light conversion layer of FIG. 7.

Referring to FIGS. 7 and 8 together with FIG. 1, the diffusion sheet 2400 applied to the backlight unit according to another exemplary embodiment may include a first transparent film 2410, a first optical layer 2420, and a light conversion. Layer 2430, a first barrier layer 2440, and a second barrier layer 2450.

Since the diffusion sheet 2400 is substantially the same as the diffusion sheet 1400 described with reference to FIG. 2 except for the light conversion layer 2430, detailed descriptions thereof will be omitted.

The light conversion layer 2430 is interposed between the first and second barrier layers 2440 and 2450, and includes a light transmissive resin 2431, a light emitting composite 2432 dispersed in the light transmissive resin 2431, and a fluorescent light. Particles 2433. In this case, the light conversion layer 2430 may further include diffusion beads (not shown).

The light emitting composite 2432 has a structure substantially the same as that described with reference to FIGS. 4A to 4C and 5A to 5C, and may be a red light emitting composite in which red nano-light emitting bodies are disposed in the wax particles. Alternatively, the light emitting composite 2432 may be a multicolor light emitting composite having both a red nano and a green nano light emitting body disposed inside one wax particle.

In one embodiment, the fluorescent particles 2433 may include a green phosphor.

The green phosphor is a compound that emits green light, and the green light emitted by the green phosphor may have an emission spectrum having a full width at half maximum (FWHM) of about 80 nm or less. Preferably, the emission spectrum of the green light may have a half width of about 70 nm or less. More preferably, the emission spectrum of the green light may have a half width of about 60 nm or less.

As the green phosphor, silicate-based phosphors, silicon oxynitride-based phosphors, sulfide-based phosphors, sialon-based phosphors, oxide-based phosphors, etc. may be used, and these may be used alone or in combination of two or more.

The silicate-based phosphor may be represented by "MSi _x O _y : Re" (x and y are each independently an integer of 1 or more). In this case, M represents barium (Ba), strontium (Sr), calcium (Ca) or magnesium (Mg), and these may be included alone or in combination of two or more. In the silicate phosphor, an element ratio of M to Si, O, and Re may have various values. In addition, when M includes two or more elements in the silicate phosphor, an element ratio between elements constituting M may also have various values. Re is europium (Eu), yttrium (Y), lanthanum (La), cerium (Ce), neodymium (Nd), promethium (Pm), samarium (Sm), gadolinium (Gd), terbium (Tb), dysprosium ( Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), fluorine (F), chlorine (Cl), bromine (Br) or iodine (I) These may be included alone or in combination of two or more, respectively. When Re includes two or more elements in the silicate phosphor, an element ratio between elements constituting Re may have various values. As a specific example, the silicate-based phosphor may include Ba ₂ SiO ₄ : Eu, Ca ₂ SiO ₄ : Eu, Sr ₂ SiO ₄ : Eu, Ba ₂ SrSiO ₄ : Eu, Ca ₈ Mg (SiO ₄ ) ₄ Cl ₂ : Eu , Ca ₂ Sr ₂ MgSi ₂ O ₇ : Eu, Ca ₃ Sc ₂ Si ₃ O ₁₂ : Ce and the like can be used.

The silicon oxynitride-based phosphor may be represented by "MSi _x O _y N _z : Re" (x, y and z are each independently an integer of 1 or more). At this time, since M and Re are substantially the same as described above, overlapping descriptions are omitted. As a specific example, the silicon oxynitride-based phosphor may include BaSi ₂ O ₂ N ₂ : Eu, SrSi ₂ O ₂ N ₂ : Eu, CaSi ₂ O ₂ N ₂ : Eu, Ba ₃ Si ₆ O ₁₂ N ₂ : Eu, and the like. This can be used.

The sulfide-based phosphor may be represented by "MA _x D _y : Re" (x and y are each independently an integer of 1 or more). At this time, since M and Re are substantially the same as described above, overlapping descriptions are omitted. A represents gallium (Ga), aluminum (Al) or indium (In), and these may be included alone or in combination of two or more. When A includes two or more elements in the sulfide-based phosphor, the element ratio between the elements constituting A may have various values. D represents sulfur (S), selenium (Se) or tellurium (Te), and these may be included alone or in combination of two or more. When D includes two or more elements in the sulfide-based phosphor, an element ratio between elements constituting D may have various values. As a specific example, in the sulfide-based phosphor is _{_{SrGa 2 S 4: Eu, BaGa}} 2 S 4: Eu, SrAl 2 S 4: Eu There are the like can be used.

The sialon-based phosphor may be represented by "β-SiAlON: Re". In this case, since Re is substantially the same as described above, redundant description is omitted. As a specific example, β-SiAlON: Eu or the like may be used as the sialon-based phosphor.

The oxide phosphor may be represented by "MG _x O _y : Re '" (x and y are each independently an integer of 1 or more). At this time, since M is substantially the same as described above, overlapping description is omitted. G represents scandium (Sc), yttrium (Y), gadolinium (Gd), lanthanum (La), lutetium (Lu), aluminum (Al) or indium (In), each of which may be included alone or in combination of two or more. Can be. When G includes two or more elements in the oxide-based phosphor, the element ratio between the elements constituting G may have various values. Re 'is cerium (Ce), neodymium (Nd), promethium (Pm), samarium (Sm), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium ( Yb), fluorine (F), chlorine (Cl), bromine (Br) or iodine (I), each of which may be included alone or in combination of two or more. In the oxide-based phosphor, when Re 'includes two or more elements, the element ratio between the elements constituting Re' may have various values. As a specific example, Sr ₄ Al ₁₄ O ₂₅ : Eu, CaSc ₂ O ₄ : Ce, SrAl ₂ O ₄ : Eu, and the like may be used as the oxide-based phosphor.

The green phosphor may have a diameter of about 5 μm to about 55 μm. In order to uniformly disperse the green phosphor in the light transmitting resin forming the light conversion layer 1131, the diameter of the green phosphor may be about 8 μm to about 15 μm. The diameter of the green phosphor refers to the diameter measured by the Dynamic Light Scattering method (DLS method) calculated by the Stokes-Einstein equation for the diffusion coefficient.

In another embodiment, the fluorescent particles 2433 may include the green fluorescent composite 300 as shown in FIG. 8.

The green fluorescent composite 300 includes wax particles Wx and green phosphors Px disposed inside the wax particles Wx.

The wax particles Wx are formed of a wax compound. Since the wax-based compound is substantially the same as that described in FIG. 2, detailed descriptions thereof will be omitted.

At least one green phosphor Px may be disposed in the wax particle Wx. Since the green phosphor Px is substantially the same as the green phosphor described with reference to FIG. 7, detailed descriptions thereof will be omitted.

The green fluorescent composite 300 may have a diameter of about 10 μm to about 70 μm. In order to uniformly disperse the green fluorescent composite 300 in the light conversion layer 2430, the diameter of the green fluorescent composite 300 may be about 15 μm to about 35 μm. The diameter of the green fluorescent composite 300 refers to the diameter measured by the dynamic light scattering method (DLS method), such as the diameter of the green phosphor.

In the diffusion sheet 2400, the first optical layer 2420 having the light diffusion pattern 2421 formed on the surface thereof faces the light guide plate 1200, and the second barrier layer 2450 is disposed on the first light collecting sheet ( The light guide plate 1200 and the first light collecting sheet 1500 may be disposed to face 1500. In contrast, the diffusion sheet 2400 may include the light guide plate such that the second barrier layer 2450 faces the light guide plate 1200 and the first optical layer 2420 faces the first light collecting sheet 1500. 1200 may be disposed between the first light collecting sheet 1500.

The backlight unit 2000 described above uses the diffusion sheet 2400 including the light conversion layer 2430 to widen the color reproduction area of the display device and to improve color purity and color reproducibility of colors displayed by the display device. Can be. In this case, the light conversion layer 2430 uses a light emitting composite 2432 and fluorescent particles 2433 having high stability against light, moisture, and / or heat in an external environment, and protects the first and second barrier layers. By using the fields 2440 and 2450, the light stability and the moisture / thermal stability of the diffusion sheet 2400 may be significantly improved.

Referring to FIG. 9 together with FIG. 1, the diffusion sheet 3400 applied to the backlight unit according to another exemplary embodiment may include a first transparent film 3410, a first optical layer 3420, and a light conversion layer ( 3430, a first barrier layer 3440, a second barrier layer 3450, a second transparent film 3460, and a second optical layer 3470.

The first optical layer 3420 having the first transparent film 3410, the first and

second barrier layers

3440 and 3450, and the light diffusion pattern 3421 formed thereon is substantially the same as that described with reference to FIG. 2. Same as Therefore, redundant descriptions are omitted.

The light conversion layer 3430 is substantially the same as the light conversion layer 1430 described with reference to FIG. 2 or the light conversion layer 2430 described with reference to FIG. 7.

For example, the light conversion layer 3430 may include a red light emitting composite as described in FIG. 2. Alternatively, the light conversion layer 3430 may include a green light emitting composite together with a red light emitting composite, or may include a multicolor light emitting composite having a structure in which a red nano light emitting body and a green nano light emitting body are covered by one wax particle. When the light conversion layer 3430 includes the multicolor light emitting composite, the light conversion layer 3430 may further include at least one of a green light emitting composite and a red light emitting composite.

In contrast, the light conversion layer 3430 may include a green phosphor together with the red light emitting composite as described with reference to FIG. 7. Alternatively, the light conversion layer 3430 may include a green fluorescent composite together with the red light emitting composite. Alternatively, the light conversion layer 3430 may further include at least one of a red light emitting composite, a green light emitting composite, and a multicolor light emitting composite together with the green phosphor or the green fluorescent composite.

The second transparent film 3460 is disposed on the second barrier layer 3450, so that the second barrier layer 3450 is between the second transparent film 3460 and the light conversion layer 3430. Is placed on. Since the material forming the second transparent film 3460 is substantially the same as the material forming the first transparent film 1410 described with reference to FIG. 2, detailed descriptions thereof will be omitted.

The second optical layer 3470 is disposed on the second transparent film 3460, so that the second transparent film 3460 is the second optical layer 3470 and the second barrier layer 3450. Is placed in between. The second optical layer 3470 includes a light diffusion pattern 3471 formed on the surface thereof. Since the light diffusion pattern 3471 of the second optical layer 3470 is substantially the same as the light diffusion pattern 341 of the first optical layer 3420, detailed descriptions thereof will be omitted. However, the light diffusion patterns 341 and 3471 of the first and second

optical layers

3420 and 3470 may have the same shape or may have different shapes.

In the diffusion sheet 3400, the second optical layer 3470 is formed and described on the second transparent film 3460, but the second optical layer 3470 may be omitted.

Referring to FIG. 10 together with FIG. 1, the diffusion sheet 4400 applied to the backlight unit according to another exemplary embodiment may include a first transparent film 4410, a first barrier layer 4440, and a light conversion layer ( 4430, a second barrier layer 4450, a second transparent film 4460, a first optical layer 4420, and a second optical layer 4470.

Except for the light conversion layer 4430, since it is substantially the same as the diffusion sheet 3400 described with reference to FIG. 9, differences will be described based on differences and detailed description thereof will be omitted.

The light conversion layer 4430 is disposed between the first light conversion layer 4431 and the first light conversion layer 4431 and the second barrier layer 4450 disposed on the first barrier layer 4440. A second light conversion layer 4432.

As an example, the first light conversion layer 4431 may include at least one of a green light emitting composite and green fluorescent particles. The green light emitting composite has a structure substantially the same as that described with reference to FIGS. 4A to 4C and 5A to 5C and includes green nano light-emitting bodies. In addition, the green fluorescent particles include a green fluorescent substance substantially the same as that described in FIG. 7 or a green fluorescent composite substantially the same as that described in FIG. 8. Therefore, redundant descriptions are omitted.

The second light conversion layer 4432 may include at least one of a red light emitting composite and a multicolor light emitting composite. The red light-emitting composite has a structure substantially the same as that described with reference to FIGS. 4A to 4C and 5A to 5C and includes a red nano light-emitting body. In addition, the multicolor light-emitting composite has a structure substantially the same as that described in FIGS. 4A to 4C and 5A to 5C, and includes both a red nano light emitting body and a green nano light emitting body.

Meanwhile, the second light conversion layer 4432 may further include at least one of the green light emitting composite and the green fluorescent particles together with the red light emitting composite and / or the multicolor light emitting composite.

The light conversion layer 4430 includes the first and second

light conversion layers

4431 and 4432 stacked sequentially, and the light emitted from the light guide plate 1200 may pass through the first light conversion layer 4431. When passing through the second light conversion layer 4432 after the passage, a part of the green light generated by the first light conversion layer 4431 is transmitted to the red light emitting composite and / or of the second light conversion layer 4432. The red nano light-emitting body of the multi-color light emitting complex is excited. Accordingly, the red light emitting composite of the second light conversion layer 4432 and / or the red nano light emitting body of the multicolor light emitting composite may not only provide light provided by the light emitting device 1100, but also the first light converting layer 4431. May be excited by some of the green light produced by That is, the red light emitting composite of the second light conversion layer 4432 and / or the red nano light emitting body of the multicolor light emitting composite is sufficient to be excited from the first light conversion layer 4431 and the light emitting device 1100. Light may be provided. In addition, when the green light emitting composite is dispersed in the first light conversion layer 4431, since the green light emitting composite receives light primarily from the light emitting device 1100, the second light conversion layer 4432. Relatively high energy can be delivered, and thus the power density of light generated by the green light-emitting composite can be maximized.

As another example, the first light conversion layer 4431 includes at least one of the red light emitting composite and the multicolor light emitting composite, and the second light conversion layer 4432 includes the green light emitting composite, the green phosphor and It may include at least one of the green fluorescent complex.

Meanwhile, at least one of the first and

second photoconversion layers

4431 and 4432 may further include diffusion beads. When the light conversion layer 4430 includes the diffusion beads, the first and second

optical layers

4420 and 4470 may be omitted.

Referring to FIG. 11 together with FIG. 1, the diffusion sheet 5400 applied to the backlight unit according to another exemplary embodiment may include a first transparent film 5410, a first barrier layer 5440, and a light conversion layer ( 5430, a second barrier layer 5450, a second transparent film 5460, a first optical layer 5520, and a second optical layer 5470. Since the diffusion sheet 5400 is substantially the same as the diffusion sheet 4400 described with reference to FIG. 10 except for the light conversion layer 5430, detailed descriptions thereof will be omitted.

The photoconversion layer 5430 is disposed between the first barrier layer 5440 and the second barrier layer 5450, and includes a first photoconversion layer 5431 formed on the first barrier layer 5440, Between the first light conversion layer 5431 and the second barrier layer 5450, the second light conversion layer (5432) and between the first light conversion layer (5431) and the second light conversion layer (5432) And an adhesive layer 5433 interposed therebetween.

Since the first light conversion layer 5431 and the second light conversion layer 5432 are substantially the same as those described with reference to FIG. 10, detailed description thereof will be omitted.

The adhesive layer 5433 serves to bond the first light conversion layer 5431 and the second light conversion layer 5432. The adhesive layer 5433 may bond the first light conversion layer 5431 and the second light conversion layer 5432 while the adhesive compound is cured. The adhesive layer 5433 is not particularly limited and may be formed using any conventionally known resin as long as it is a resin that transmits light and has adhesiveness.

The adhesive layer 5433 may include a moisture absorbent. The moisture absorbent may absorb and remove moisture introduced into each of the first and second

light conversion layers

5431 and 5432. Examples of the moisture absorbent include metal oxides such as calcium oxide, barium oxide, strontium oxide, magnesium oxide, calcium carbonate, and magnesium sulfate. And organometallic compounds such as aluminum oxide acylate, aluminum oxide alkoxide and aluminum oxide alylate, zeolites, and the like. These can be used individually or in mixture of 2 or more, respectively.

In FIG. 11, the adhesive layer 5433 is disposed between the first and second

light conversion layers

5431 and 5432 as an example, but the light conversion layer 5430 is the first barrier layer. It may include an adhesive layer disposed between the 5440 and the first light conversion layer (5431), or may include an adhesive layer disposed between the second barrier layer 5450 and the second light conversion layer (5432). . Alternatively, the light conversion layer 5430 may additionally include the first barrier layer 5440 and the first light conversion layer in addition to the adhesive layer 5433 disposed between the first and second

light conversion layers

5431 and 5432. The adhesive layer may further include one or more of an adhesive layer disposed between the 5453 and an adhesive layer disposed between the second barrier layer 5450 and the second light conversion layer 5432.

As described above, the diffusion sheet 5400 uses a light emitting composite such as a red light emitting composite and / or a green light emitting composite, so that the white light provided by the backlight unit passes through the color filter of the display device. Can improve.

At the same time, the diffusion sheet 5400 uses the light emitting composite together with the first and

second barrier layers

5431 and 5432 to minimize damage to the nano light-emitting body by light, moisture, and / or heat of an external environment. can do. That is, the nano light-emitting body may be protected from the external environment by the first and

second barrier layers

5431 and 5432 as well as the wax particles constituting the light-emitting composite. In addition, the nano light-emitting body may be protected from the external environment by applying the adhesive layer 5433 including the moisture absorbent to the light conversion layer 5430.

In addition, when the light conversion layer 5430 includes the green fluorescent composite, the green fluorescent composite is uniformly dispersed in the light conversion layer 5430, but the dispersion stability is good because the manufacturing of the light conversion layer 5430 Reliability and product reliability can be improved.

12 is a cross-sectional view for describing a backlight unit according to still another embodiment of the present invention, and FIG. 13 is a cross-sectional view for explaining the light conversion sheet of FIG. 12.

12 and 13, the backlight unit 6000 may include a light emitting element 6100, a light guide plate 6200, a reflecting plate 6300, a light conversion film 6700, a diffusion sheet 6400, and a first light collecting sheet 6500. ) And the second light collecting sheet 6600.

The backlight unit 6000 is substantially the same as the backlight unit 1000 described with reference to FIG. 1 except for the light conversion film 6700 and the diffusion sheet 6400. Therefore, redundant descriptions are omitted.

The diffusion sheet 6400 is a conventional diffusion sheet including a base film and a light diffusion layer. The light diffusing layer may be formed on one surface of the base film or on both surfaces thereof. The light diffusion layer may include a light diffusion pattern formed on a surface thereof, and the light diffusion pattern may be substantially the same as the light diffusion pattern 1421 of the first optical layer 1420 described with reference to FIG. 2. Alternatively, the light diffusing layer may include diffusion beads. When the light diffusing layer includes the diffusion beads, the surface of the light diffusing layer may be a planarized surface.

The light conversion film 6700 may be disposed between the light guide plate 6200 and the diffusion sheet 6400. The light conversion film 6700 may include a first transparent film 6710, a first barrier layer 6740, a light conversion layer 6730, a second barrier layer 6750, and a second transparent film 6560.

Each of the first transparent film 6710 and the second transparent film 6560 is substantially the same as the first and second

transparent films

3410 and 3460 described with reference to FIG. 9. Each of the first barrier layer 6740 and the second barrier layer 6750 is substantially the same as the first and

second barrier layers

1440 and 1450 described with reference to FIG. 2. In addition, the light conversion layer 6730 has the same structure as that of the light conversion layer 4430 described with reference to FIG. 10 or the

light conversion layers

1430, 2430, described with reference to FIGS. 2 to 9 and 11, as shown in FIG. 13. It may have any one of the structures of 3430, 5430. Therefore, redundant descriptions are omitted. Meanwhile, any one of the first transparent film 6710 and the second transparent film 6760 may be omitted.

Meanwhile, the light conversion film 6700 may include a first optical layer (not shown) formed on one surface of the first transparent film 6710 and a second optical layer formed on one surface of the second transparent film 6760. Not shown) may be further included. The first optical layer is formed on one surface of the first transparent film 6710 facing the surface on which the first barrier layer 6740 is formed, and the second optical layer is formed on the second barrier layer 6750. It may be formed on one surface of the second transparent film (6760) facing the formed surface.

12 and 13 illustrate the case where the light conversion film 6700 is disposed between the light guide plate 6200 and the diffusion sheet 6400, but the light conversion film 6700 is described above. The diffusion sheet 6400 and the first light collecting sheet 6500 may be disposed.

As described above, the light conversion film 6700 is a separate optical sheet independent of the light guide plate 6200, the diffusion sheet 6400, and the first and second

light collecting sheets

6500 and 6600. It may be included in the backlight unit 6000. By using the light conversion film 6700, the backlight unit 6000 may improve the color reproducibility of the display device, and at the same time, the light conversion layer may be formed by the first and

second barrier layers

6740 and 6750. 6730 can be minimized to damage by light, moisture and / or heat of the external environment.

14 is a cross-sectional view for describing a backlight unit according to still another embodiment of the present invention, and FIG. 15 is a cross-sectional view for explaining a first light collecting sheet of FIG. 14.

14 and 15, the backlight unit 7000 may include a light emitting element 7100, a light guide plate 7200, a reflecting plate 7300, a diffusion sheet 7400, a first light collecting sheet 7500, and a second light collecting sheet ( 7600). The backlight unit 7000 is substantially the same as the backlight unit 1000 described with reference to FIG. 1 except for the diffusion sheet 7400 and the first light collecting sheet 7500, and the diffusion sheet 7400 is illustrated in FIG. 12. It is substantially the same as the diffusion sheet 6400 described above. Therefore, redundant descriptions are omitted.

The first light collecting sheet 7500 may include a first transparent film 7510, a first barrier layer 7750, a light conversion layer 7530, a second barrier layer 7750, a second transparent film 7560, and a first transparent film 7510. Optical layer 7570.

Each of the first transparent film 7510 and the second transparent film 7560 is substantially the same as the first and second

transparent films

3410 and 3460 described with reference to FIG. 9, and the first barrier layer 7540. And each of the second barrier layers 7750 is substantially the same as the first and

second barrier layers

1440 and 1450 described with reference to FIG. 2, and the light conversion layer 7530 is the first light conversion layer 7531. And a second light conversion layer 7532. Each of the first and second photoconversion layers 7531 and 7532 is substantially the same as each of the first and

second photoconversion layers

4431 and 4432 described with reference to FIG. 10, and thus descriptions thereof will be omitted. Alternatively, the light conversion layer 7530 may have any one of the structures of the

light conversion layers

1430, 2430, 3430, and 5430 described with reference to FIGS. 2 to 9 and 11. Therefore, detailed description thereof will be omitted.

The first optical layer 7570 is formed on the second transparent film 7560. Accordingly, the second transparent film 7560 may be disposed between the first optical layer 7570 and the second barrier layer 7750. The first optical layer 7570 includes a light collecting pattern 7551 formed on a surface thereof. The condensing pattern 7551 may have a cross-sectional shape that may refract light passing through the second transparent film 7560 in a vertical direction.

For example, the condensing pattern 7551 may include a plurality of protrusions, and each of the protrusions may have a triangular shape. The protrusions extend in a first direction and may be continuously arranged in a second direction crossing the first direction. For example, each of the protrusions may have a triangular pillar shape having a constant height. In contrast, the height of each of the protrusions may vary along the first direction. In this case, the height of the protrusion may be changed linearly or non-linearly along the first direction. Furthermore, the height of the protrusions may be changed to have a predetermined period but may be changed irregularly. In this case, the height of each protrusion may be changed independently of each other. The vertex angle of each protrusion constituting the condensing pattern 7551 may be about 90 °, but may be appropriately adjusted as necessary. When the height of the protrusion changes along the first direction, the vertex angle may vary according to the position.

Although not shown in the drawings, a second optical layer (not shown) may be further formed on the first transparent film 7510. In this case, the first transparent film 7510 may be disposed between the second optical layer and the first barrier layer 7540. The second optical layer includes a light diffusion pattern formed on a surface thereof, and the light diffusion pattern is substantially the same as the light diffusion pattern 1421 described with reference to FIG.

14 and 15 illustrate the first light collecting sheet 7500 as an example, the first light collecting sheet 1500 may be the first light collecting sheet 1500 of the backlight unit 1000 described with reference to FIG. 1. The second light collecting sheet 7600 disposed on the first light collecting sheet 7500 may be formed in the structure described with reference to FIGS. 14 and 15 to configure the backlight unit 7000.

On the other hand, each of the first light collecting sheet 7500 and the second light collecting sheet 7600 may include a first transparent film, a first barrier layer, a light conversion layer, a second barrier layer, a second transparent film, and a first optical layer. And a green light emitting composite, a green phosphor, and a green fluorescent composite are dispersed in the light conversion layer of the first light collecting sheet 7500, and red in the light conversion layer of the second light collecting sheet 7700. The light emitting complex may be configured to be dispersed. In this case, in the light conversion layer of the second light collecting sheet 7600, the multi-color light emitting composite including the red nano light emitting body and the green nano light emitting body instead of the red light emitting composite, or the multi-color light emitting composite together with the red light emitting composite may be dispersed. Alternatively, at least one of the green light emitting composite, the green phosphor, and the green fluorescent composite may be dispersed in the light conversion layer of the second light collecting sheet 7600 together with the red light emitting composite.

FIG. 16 is a cross-sectional view illustrating a backlight unit according to still another embodiment of the present invention, and FIG. 17 is a cross-sectional view illustrating the light collecting sheet of FIG. 16.

16 and 17, the backlight unit 8000 includes a light emitting element 8100, a light guide plate 8200, a reflecting plate 8300, and an inverted prism sheet 8500.

The light emitting device 8100, the light guide plate 8200, and the reflecting plate 8300 are substantially the same as the light emitting device 1100, the light guide plate 1200, and the reflecting plate 1300 described with reference to FIG. 1. Therefore, redundant descriptions are omitted.

The reverse prism sheet 8500 is disposed on the light guide plate 8200. Specifically, the reverse prism sheet 8500 is disposed on the light guide plate 8200 so as to face the reflective plate 8300 with the light guide plate 8200 interposed therebetween.

The anti-prism sheet 8500 may include a first transparent film 8510, a first barrier layer 8540, a light conversion layer 8530, a second barrier layer 8850, a second transparent film 8560, first and Second

optical layers

8520 and 8570.

Each of the first transparent film 8510 and the second transparent film 8560 is substantially the same as the first and second

transparent films

3410 and 3460 described with reference to FIG. 9, and the first barrier layer 8404 is used. And each of the second barrier layers 8850 is substantially the same as the first and

second barrier layers

1440 and 1450 described with reference to FIG. 2, and the light conversion layer 8530 is illustrated in FIG. 17. The structure of the light conversion layer 4430 described with reference to FIG. 10 may be the same as that of any one of the structures of the

light conversion layers

1430, 2430, 3430, and 5430 described with reference to FIGS. 2 through 9 and 11. Therefore, detailed description thereof will be omitted.

The first optical layer 8520 is formed on the first transparent film 8510. The first optical layer 8520 is formed on an opposite surface of one surface of the first transparent film 8510 on which the first barrier layer 8540 is formed, and thus the first transparent film 8510 is formed on the first surface. The barrier layer 8540 is disposed between the first optical layer 8520 and the first optical layer 8520. The first optical layer 8520 includes a light collecting pattern 8251 formed on a surface thereof. The condensing pattern 8251 is substantially the same as the condensing pattern 7551 of the first optical layer 7570 described with reference to FIG. 15, and thus a detailed description thereof will be omitted.

The second optical layer 8070 is formed on the second transparent film 8560. The second optical layer 8070 is formed on an opposite surface of one surface of the second transparent film 8560 on which the second barrier layer 8850 is formed, and thus the second transparent film 8560 is formed of the second optical layer 8560. 2 is disposed between the optical layer (8570) and the second barrier layer (8550). The second optical layer 8070 includes a light diffusion pattern 8571 formed on a surface thereof. Since the light diffusion pattern 8571 is substantially the same as the light diffusion pattern 1421 of the first optical layer 1420 described with reference to FIG. 2, detailed description thereof will be omitted.

The anti-prism sheet 8500 may face the first optical layer 8520 including the light collecting pattern 8251, and face the light guide plate 8200, and include the second optical layer 8070. Is disposed on the light guide plate 8200 so as to face the display panel (not shown).

When the reverse prism sheet 8500 having the above configuration is disposed on the light guide plate 8200, the reverse prism sheet 8500 may replace two light collecting sheets and a diffusion sheet. In this case, the light guide plate 8200 may further include a prism pattern. The prism pattern may have a shape substantially the same as that of the condensing pattern 8521 of the inverse prism sheet 8500, but an extension direction of the condensation pattern 8251 may be disposed to cross the extension direction of the prism pattern. The prism pattern may have a protrusion having a vertex angle of about 90 °, or a lenticular pattern having a protrusion having a round shape. For example, the prism pattern of the light guide plate 8200 may be disposed to intersect the condensing pattern of the inverse prism sheet 8500, and the condensing direction of the light emitting element 8100 and the condensing pattern of the inverse prism sheet 8500. The extending direction of the pattern 8251 may be disposed to coincide.

Since the inverted prism sheet 8500 includes the light conversion layer 8530, white light provided by the backlight unit 8000 is passed through the color filter of the display device by a light emitting composite such as a red light emitting composite and / or a green light emitting composite. The color reproducibility of the displayed image can be improved.

Referring to FIG. 18, the backlight unit 9000 includes a light emitting element 9100, a light guide plate 9200, a reflecting plate 9300, an inverted prism sheet 9500, and a protective sheet 9600.

The light emitting element 9100, the light guide plate 9200, and the reflecting plate 9300 are substantially the same as the light emitting element 8100, the light guide plate 8200, and the reflecting plate 8300 described with reference to FIG. 17. Therefore, redundant descriptions are omitted.

The anti-prism sheet 9500 is disposed on the light guide plate 9200, and is formed on a base substrate 9510 and one surface of the base substrate 9510, and a light collecting layer 9520 having a light collecting pattern 9521 formed on a surface thereof. It includes. Since the condensing pattern 9521 is substantially the same as the condensing pattern 7551 described with reference to FIG. 15, detailed description thereof will be omitted. The reverse prism sheet 9500 may be disposed on the light guide plate 9200 so that the light collecting pattern 9521 faces the light guide plate 9200.

The protective sheet 9600 is disposed between the light guide plate 9200 and the reverse prism sheet 9500, and prevents damage of the light collecting pattern 9521 of the reverse prism sheet 9500 to prevent the damage of the light guide plate 9200. The emitted light is transferred to the inverse prism sheet 9500.

The protective sheet 9600 may include a first transparent film 9610, a first barrier layer 9940, a light conversion layer 9630, a second barrier layer 9650, a second transparent film 9960, first and second agents. Two

optical layers

9620, 9670.

Each of the first transparent film 9610 and the second transparent film 9960 may be substantially the same as the first and second

transparent films

3410 and 3460 described with reference to FIG. 9, and the first barrier layer 9940 may be used. And the second barrier layer 9650 is substantially the same as each of the first and

second barrier layers

1440 and 1450 described with reference to FIG. 2, and the light conversion layer 9630 includes the light described with reference to FIGS. 2 through 11. The structure of the conversion layers 1430, 2430, 3430, 4430, and 5430 may be the same as the structure of any one. Therefore, detailed description thereof will be omitted.

The first optical layer 9620 is formed on the first transparent film 9610. That is, the first optical layer 9620 is formed on one surface of the first transparent film 9610 to face the first barrier layer 9940 with the first transparent film 9610 interposed therebetween. The first optical layer 9620 includes a first buffer pattern 9621 formed on a surface thereof. The first buffer pattern 9621 may extend in substantially the same direction as the condensing pattern 9521 of the inverse prism sheet 9500. The first buffer pattern 9621 is coated with a curable resin on one surface of the first transparent film 9610, and then pressurized with a stamp having a pattern having a shape corresponding to that of the first buffer pattern 9621. And / or by curing using heat.

The pitch P2 of the first buffer pattern 9621 may be larger than the pitch P1 of the condensing pattern 9521 formed on the inverse prism sheet 9500. Here, the pitch of each of the light collecting pattern and the first buffer pattern may be defined as a distance between vertices or a valley between the light collecting patterns. For example, the pitch P2 of the first buffer pattern 9621 may be about 50 μm to 170 μm, and the pitch P1 of the condensing pattern 9521 may be about 10 μm to 60 μm.

In addition, the height H2 of the first buffer pattern 9621 may be relatively smaller than the height H1 of the condensing pattern 9521. Here, the height of each of the light collecting pattern and the first buffer pattern may be defined as a vertical distance from the planes D1 and D2 where the valleys of the light collecting pattern are located. For example, the height H2 of the first buffer pattern 9621 may be about 1 μm to 5 μm, and the height H1 of the condensing pattern 9521 may be about 5 μm to 40 μm.

In addition, the internal angle C2 of the first buffer pattern 9621 may be relatively smaller than the internal angle C1 of the condensing pattern 9521. Here, the inner sides C1 and C2 of the light converging pattern and the first buffer pattern may have a side surface E1 and E2 constituting a side surface of the light converging pattern or the first buffer pattern in which the valleys of the light converging pattern are located. D1 and D2) may be defined as an angle. For example, the internal angle C2 of the first buffer pattern 9621 may be about 0.5 ° to 7 °, and the internal angle C1 of the condensing pattern 9521 may be about 25 ° to 65 °.

In addition, the first buffer pattern 9621 may have a refractive index different from that of the condensing pattern 9521. For example, the refractive index of the first buffer pattern 9621 may have a smaller value than the refractive index of the condensing pattern 9521. For example, the refractive index of the first buffer pattern 9621 may be about 1.4 to 1.6, and the refractive index of the light collecting pattern 9521 may be about 1.45 to 1.65.

In addition, the first buffer pattern 9621 and the light collecting pattern 9521 may be formed of materials having different strengths. For example, the first buffer pattern 9621 may be formed of a flexible material having a lower strength than the light collecting pattern 9521. For example, the first buffer pattern 9621 may be formed of a material having the same strength as that of the light guide plate 9200 or may be formed of a flexible material having a lower strength than that of the light guide plate 9200.

The second optical layer 9706 is formed on the second transparent film 9960. The second optical layer 9706 is formed on one surface of the second transparent film 9960 to face the second barrier layer 9650 with the second transparent film 9960 interposed therebetween. The second optical layer 9706 may include diffusion beads (not shown) including a second buffer pattern 9671 formed on a surface thereof or dispersed therein. When the second optical layer 9706 includes the second buffer pattern 9671, the second buffer pattern 9671 may be formed of the light diffusion pattern 1421 of the first optical layer 1420 described with reference to FIG. 2. Since it is substantially the same, overlapping detailed description thereof will be omitted. The second buffer pattern 9671 may perform a light diffusion function. When the second optical layer 9706 includes the light diffusion beads dispersed therein, the second buffer pattern 9671 may not be formed on the surface of the second optical layer 9706. In contrast, even when the second optical layer 9706 includes light diffusion beads dispersed therein, the second buffer pattern 9671 may be formed on the surface of the second optical layer 9700.

The protective sheet 9600 may include the light guide plate 9200 and the first buffer pattern 9621 facing the light guide plate 9200 and the second buffer pattern 9671 facing the inverse prism sheet 9500. It is disposed between the anti-prism sheet 9500.

When the upper surface of the protective sheet 9600 has the second buffer pattern 9671, it is possible to reduce the contact area between the top of the condensing pattern 9521 formed on the inverse prism sheet 9500 and the protective sheet 9600. As a result, optical defects such as 'Wet-Out' can be reduced. Here, 'Wet-Out' is a phenomenon that occurs when the change of the refractive index is removed when two sheet surfaces are optically contacted with each other and light is transmitted from one sheet to another sheet. Or a phenomenon recognized as a defective part.

In FIG. 18, the reverse prism sheet 9500 does not include a light emitting composite or fluorescent particles. For example, in the backlight unit illustrated in FIG. 18, the reverse prism sheet 9500 has the reverse prism described with reference to FIG. 17. May be replaced by a sheet 8500.

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 제조Manufacture of backlight unit

[실시예 1]Example 1

(1) 광원의 준비(1) Preparation of the light source

A blue light emitting device showing an emission peak at about 444 nm was used as a light source.

(2) 도광판의 준비(2) Preparation of the 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.

(3) 확산 시트의 준비(3) 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 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 130 ℃ to prepare a wax solution. A solution containing about 20 mg of CdSe-based red nanoluminescent material (trade name: Nanodot-HE-610, QD solution, Korea) in 1 ml of toluene was added to the wax solution, mixed, and cooled to room temperature A first solution in which the light emitting complex was dispersed was prepared.

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 light-emitting composite. After addition and mixing, the mixture was cooled to room temperature to prepare a second solution in which the green light-emitting composite was dispersed.

The first and second solutions were 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). TPO 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, the red light emitting composite, the green light emitting composite, and the photoinitiator were mixed. At this time, in the coating composition, about 0.4 parts by weight of the red light-emitting composite was included, and about 4.9 parts by weight of the green light-emitting composite based on 100 parts by weight of urethane acrylate.

On the polyethylene terephthalate (PET) film having a thickness of about 38 μm as a first transparent film, a first inorganic layer having a thickness of about 0.8 μm made of silicon carbide (SiOC) is formed by plasma chemical vapor deposition, and the first inorganic film is formed. A second barrier layer made of aluminum oxide (Al ₂ O ₃ ) and having a thickness of about 50 nm was formed on the inorganic layer by using an atomic layer deposition method to form a first barrier layer.

The coating composition was coated to a thickness of about 100 μm on the second inorganic layer of the first barrier layer and cured to form a light conversion layer.

An aluminum oxide film (Al ₂ O ₃ ) having a thickness of about 50 nm was formed as a second barrier layer on the light conversion layer by an ALD method (atomic layer deposition method).

Subsequently, on the opposite side of the surface on which the first barrier layer and the light conversion layer were formed in the first transparent film, the total average was used by using a composition having TPO mixed at about 0.8 parts by weight with respect to 100 parts by weight of urethane acrylate. An optical layer having a light diffusion pattern having a thickness of about 7 μm was formed to prepare a diffusion sheet.

(4) 제1 및 제2 집광 시트들의 준비(4) Preparation of the first and second light collecting sheets

The coating composition was prepared by mixing with epoxy acrylate and TPO purchased from BASF (company name, Germany). In this case, the photoinitiator was mixed in about 0.8 parts by weight based on 100 parts by weight of epoxy acrylate. The coating composition was coated on a PET film having a thickness of about 75 μm, and then pressed with a molding roll to prepare a light collecting pattern having a height of about 25 μm on the PET film, thereby preparing a first light collecting sheet.

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

(5) 백라이트 유닛의 준비(5) Preparation of the backlight unit

The backlight unit according to the first exemplary embodiment of the present invention was prepared by assembling the light emitting device prepared as described above, the light guide plate, the diffusion sheet, and the first and second light collecting sheets sequentially stacked. In this case, the diffusion sheet is disposed on the light guide plate such that the optical layer of the diffusion sheet faces the light guide plate and the second barrier layer faces the first light collection sheet.

[실시예 2]Example 2

(1) 발광 소자, 도광판, 제1 및 제2 집광 시트들의 준비(1) Preparation of light emitting element, light guide plate, first and second light collecting sheets

The light emitting device, the light guide plate, the first and the second light collecting sheets were prepared substantially the same as in the backlight unit according to the first embodiment.

(2) 확산 시트의 준비(2) Preparation of Diffusion Sheet

A first barrier layer formed on the first transparent film was prepared in substantially the same manner as in the preparation of the diffusion sheet of Example 1, and the urethane acrylate, the red light emitting composite, the green light emitting composite and A coating layer was formed by coating a coating composition substantially the same as the coating composition prepared in the manufacturing process of the diffusion sheet of Example 1, in which the photoinitiator was mixed, to a thickness of about 100 μm.

Preparing a first transparent film and a second transparent film and a second barrier layer substantially the same as the first barrier layer to cover the coating layer on the coating layer in contact with the second barrier layer, by irradiating light to the coating layer The photoconversion layer was formed by hardening.

Subsequently, using a composition having a TPO mixed at about 0.8 parts by weight with respect to 100 parts by weight of urethane acrylate on the outer surfaces of each of the first transparent film and the second transparent film, the total thickness is about 7 μm. The 1st optical layer and the 2nd optical layer which have a pattern were formed, and the diffusion sheet was prepared.

Accordingly, the diffusion sheet in which the first optical layer, the first transparent film, the first barrier layer, the light conversion layer formed by curing the coating layer, the second barrier layer, the second transparent film, and the second optical layer are sequentially stacked Prepared.

(3) 백라이트 유닛의 준비(3) Preparation of the backlight unit

The backlight unit according to Example 2 of the present invention was prepared by assembling the light emitting device prepared as described above, the light guide plate, the diffusion sheet, and the first and second light collecting sheets sequentially stacked. In this case, the diffusion sheet was disposed on the light guide plate such that a first optical layer faced the light guide plate and the second optical layer faced the first light collecting sheet.

[실시예 3]Example 3

The light emitting device, the light guide plate, the first and the second light collecting sheets were prepared substantially the same as the backlight unit according to the first embodiment.

(2) 확산 시트의 준비(2) Preparation of Diffusion Sheet

Urethane acryl purchased from BASF (Company, Germany) for the first solution used in the process for producing the diffusion sheet of Example 1 and the green phosphor LP-F525 (trade name) purchased from LWB (company name, Germany) Mixed with rate and TPO. TPO 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, a red light emitting composite, a green phosphor, and a photoinitiator were mixed. At this time, about 100 parts by weight of the urethane acrylate, the red light emitting composite contained about 0.3 parts by weight, the green phosphor contained about 11.2 parts by weight.

The coating composition was coated to a thickness of about 100 μm on the second inorganic layer of the first barrier layer to form a coating layer. Preparing a first transparent film and a second transparent film and a second barrier layer substantially the same as the first barrier layer to cover the coating layer on the coating layer in contact with the second barrier layer, by irradiating light to the coating layer The photoconversion layer was formed by hardening.

(3) 백라이트 유닛의 준비(3) Preparation of the backlight unit

The backlight unit according to the third exemplary embodiment of the present invention was prepared by assembling the light emitting device prepared as described above, the light guide plate, the diffusion sheet, and the first and second light collecting sheets sequentially stacked. In this case, the diffusion sheet was disposed on the light guide plate such that a first optical layer faced the light guide plate and the second optical layer faced the first light collecting sheet.

[실시예 4]Example 4

(2) 확산 시트의 준비(2) Preparation of Diffusion Sheet

First, 20 mg of oxidized HDPE wax (trade name: Licowax PED 136 wax, Clariant, Switzerland) having an acid value of about 30 mg KOH / g was mixed with 1 ml of toluene. After that, the wax-based compound was dissolved by raising the temperature to about 130 ° C. to prepare a wax solution. To the wax solution, a toluene solution in which 20 mg of green phosphor LP-F525 (trade name) purchased from LWB (company name, Germany) and 1 ml of toluene was mixed was added and mixed. The mixed solution of the wax solution and the toluene solution was cooled to room temperature to prepare a dispersion solution in which a fluorescent complex including wax particles and the green phosphor was dispersed.

The first solution and the dispersion solution used in the process for producing the diffusion sheet of Example 1 were mixed with urethane acrylate and TPO purchased from BASF (Company name, Germany). TPO 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, a red light emitting composite, a fluorescent composite, and a photoinitiator were mixed. In this case, about 100 parts by weight of the urethane acrylate, the red light-emitting composite contained about 0.3 parts by weight, and the fluorescent composite contained about 11.2 parts by weight.

A first barrier layer formed on the first transparent film was prepared in substantially the same manner as in the preparation of the diffusion sheet of Example 1, and the coating composition was coated on the first barrier layer to a thickness of about 100 μm to form a coating layer. Formed.

(3) 백라이트 유닛의 준비(3) Preparation of the backlight unit

The backlight unit according to Example 4 of the present invention was prepared by assembling the light emitting device prepared as described above, the light guide plate, the diffusion sheet, and the first and second light collecting sheets sequentially stacked. In this case, the diffusion sheet was disposed on the light guide plate such that a first optical layer faced the light guide plate and the second optical layer faced the first light collecting sheet.

[실시예 5]Example 5

(2) 확산 시트의 준비(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 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 130 ° C. to prepare a wax solution. Subsequently, a solution in which about 1.34 mg of CdSe-based red nanoluminescent material (trade name: Nanodot-HE-610, QD solution, Korea) was dispersed in 1 ml of toluene, and about 18.66 mg of CdSe-based green nanoparticles in 1 ml of toluene A solution in which a light emitter (trade name: Nanodot-HE-530, QD solution, Korea) was dispersed was prepared. Two solutions prepared as described above were added to the wax solution, mixed, and cooled to room temperature to prepare a solution in which the red nanoluminescent body and the green nanoluminescent body were coated with one wax particle. .

The solution in which the multicolored light-emitting composite was dispersed was mixed with urethane acrylate and TPO purchased from BASF (company name, Germany). TPO was mixed at about 0.8 parts by weight based on 100 parts by weight of urethane acrylate. Thereafter, toluene was removed using an evaporator to prepare a coating composition in which urethane acrylate, the multicolored light-emitting composite, and the photoinitiator were mixed. In this case, in the coating composition, about 5.3 parts by weight of the multicolor light-emitting composite was included based on 100 parts by weight of urethane acrylate.

(3) 백라이트 유닛의 준비(3) Preparation of the backlight unit

The backlight unit according to the fifth embodiment of the present invention was prepared by assembling the light emitting device prepared as described above, the light guide plate, the diffusion sheet, and the first and second light collecting sheets sequentially stacked. In this case, the diffusion sheet was disposed on the light guide plate such that a first optical layer faced the light guide plate and the second optical layer faced the first light collecting sheet.

[실시예 6]Example 6

(1) 도광판, 제1 및 제2 집광 시트들의 준비(1) Preparation of Light Guide Plate, First and Second Condensing Sheets

The light guide plate, the first and the second light collecting sheets were prepared substantially the same as in the backlight unit according to the first embodiment.

(2) 발광 소자의 준비(2) Preparation of Light-Emitting Element

First, 20 mg of a wax-based compound (trade name: Licowax PED 136 wax, Clariant, Switzerland) consisting of oxidized HDPE wax having an acid value of about 30 mg KOH / g was added to 1 ml of toluene. After mixing, the wax-based compound was dissolved by raising the temperature to about 130 ° C. to prepare a wax solution. To the wax solution, 20 mg of a green phosphor LP-F525 (trade name) purchased from LWB (company name, Germany) and a toluene solution containing 1 ml of toluene were added and mixed, followed by cooling to room temperature to form wax particles and the A dispersion solution in which a fluorescent complex including a green phosphor was dispersed was prepared.

On the blue light emitting chip having an emission peak at about 444 nm purchased from Nichia (Japan) and OE-6630 (trade name) purchased from Dow Corning (USA). A light-emitting device was manufactured by molding a mixture of a thermosetting silicone resin in which A kits and B kits were mixed at a ratio of 1: 4 and curing at 150 ° C. for 2 hours.

(3) 확산 시트의 준비(3) 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 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 130 ℃ to prepare a wax solution. A solution containing about 20 mg of CdSe-based red nanoluminescent material (trade name: Nanodot-HE-610, QD solution, Korea) in 1 ml of toluene was added to the wax solution, mixed, and cooled to room temperature A solution in which the light emitting complex was dispersed was prepared.

The solution was mixed with urethane acrylate purchased from BASF (Company, Germany) and TPO purchased from BASF. TPO was mixed at about 0.8 parts by weight based on 100 parts by weight of urethane acrylate. Thereafter, toluene was removed using an evaporator to prepare a coating composition in which urethane acrylate, the red light-emitting composite, and the photoinitiator were mixed.

(4) 백라이트 유닛의 준비(4) Preparation of the backlight unit

The backlight unit according to the sixth embodiment of the present invention was prepared by assembling the light emitting device prepared as described above, the light guide plate, the diffusion sheet, and the first and second light collecting sheets sequentially stacked. In this case, the diffusion sheet was disposed on the light guide plate such that a first optical layer faced the light guide plate and the second optical layer faced the first light collecting sheet.

[실시예 7]Example 7

(2) 확산 시트의 준비(2) Preparation of Diffusion Sheet

The second solution containing the green luminescent composite prepared in the production process of the diffusion sheet of Example 1 was mixed with urethane acrylate and TPO purchased from BASF Corporation (company name, Germany). TPO 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, the green light-emitting composite, and the photoinitiator were mixed. In the first coating composition, about 9.8 parts by weight of the green light emitting composite was included based on 100 parts by weight of urethane acrylate. A first barrier layer formed on the first transparent film was prepared in substantially the same manner as in the preparation of the diffusion sheet of Example 1, and the first coating composition was coated on the first barrier layer and cured so that the thickness was about the same. A first light conversion layer having a thickness of 50 μm was formed.

Subsequently, the first solution containing the red light-emitting composite prepared in the manufacturing process of the diffusion sheet of Example 1 was mixed with urethane acrylate and TPO purchased from BASF (company name, Germany). TPO 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 second coating composition in which urethane acrylate, the red light-emitting composite, and the photoinitiator were mixed. In the second coating composition, about 0.8 parts by weight of the red light-emitting composite was included based on 100 parts by weight of urethane acrylate. Prepare a second transparent film and a second barrier layer substantially the same as the first transparent film and the first barrier layer to coat and cure the second coating composition on the second barrier layer to a thickness of about 50 ㎛ A second light conversion layer was formed.

After the first photoconversion layer and the second photoconversion layer are disposed to face each other, a composition in which a urethane acrylate and TPO as an adhesive is mixed in a weight ratio of about 100: 0.8 between the first and second photoconversion layers. The assembly was interposed and irradiated with light to form an adhesive layer between the first and second light conversion layers. The thickness of the adhesive layer was about 3 μm.

Accordingly, the first optical layer, the first transparent film, the first barrier layer, the first light conversion layer, the adhesive layer, the second light conversion layer, the second barrier layer, the second transparent film and the second optical layer Diffusion sheets stacked sequentially were prepared.

(3) 백라이트 유닛의 준비(3) Preparation of the backlight unit

The backlight unit according to the seventh exemplary embodiment of the present invention was prepared by assembling the light emitting device prepared as described above, the light guide plate, the diffusion sheet, and the first and second light collecting sheets sequentially stacked. In this case, the diffusion sheet was disposed on the light guide plate such that a first optical layer faced the light guide plate and the second optical layer faced the first light collecting sheet.

[실시예 8]Example 8

(2) 확산 시트의 준비(2) Preparation of Diffusion Sheet

The dispersion solution was mixed with urethane acrylate and TPO purchased from BASF (company name, Germany). TPO 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 third coating composition in which urethane acrylate, the fluorescent composite, and the photoinitiator were mixed. In the third coating composition, the fluorescent composite contained about 22.4 parts by weight based on 100 parts by weight of urethane acrylate. A first barrier layer formed on the first transparent film was prepared substantially the same as in the preparation of the diffusion sheet of Example 1, and the third coating composition was coated on the first barrier layer and cured so that the thickness was about the same. A first light conversion layer having a thickness of 50 μm was formed.

Subsequently, a red light-emitting composite prepared in Example 7, urethane acrylate, and the like prepared on the second barrier layer by preparing a second transparent film and a second barrier layer substantially the same as the first transparent film and the first barrier layer. A second coating composition comprising TPO was coated and cured to form a second light conversion layer having a thickness of about 50 μm.

(3) 백라이트 유닛의 준비(3) Preparation of the backlight unit

The backlight unit according to the eighth embodiment of the present invention was prepared by assembling the light emitting device prepared as described above, the light guide plate, the diffusion sheet, and the first and second light collecting sheets sequentially stacked. In this case, the diffusion sheet was disposed on the light guide plate such that a first optical layer faced the light guide plate and the second optical layer faced the first light collecting sheet.

[실시예 9]Example 9

(2) 확산 시트의 준비(2) Preparation of Diffusion Sheet

The coating composition was prepared by mixing urethane acrylate and TPO purchased from BASF (company name, Germany). TPO 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 PET film having a thickness of about 38 μm and cured to form a light diffusion layer on the surface thereof, thereby preparing a diffusion sheet including a base substrate and the light diffusion layer, wherein the average thickness of the light diffusion layer was about 50 μm. It was.

(3) 광변환 필름의 준비(3) Preparation of the light conversion film

A first coating composition including a green light emitting composite prepared in a manufacturing process of the diffusion sheet of Example 7 was prepared. A first barrier layer formed on the first transparent film was prepared in substantially the same manner as in the preparation of the diffusion sheet of Example 1, and the first coating composition was coated on the first barrier layer and cured so that the thickness was about the same. A first light conversion layer having a thickness of 50 μm was formed.

Subsequently, a second coating composition including the red light-emitting composite prepared in the manufacturing process of the diffusion sheet of Example 7 was prepared. Prepare a second transparent film and a second barrier layer substantially the same as the first transparent film and the first barrier layer to coat and cure the second coating composition on the second barrier layer to a thickness of about 50 ㎛ A second light conversion layer was formed.

(4) 백라이트 유닛의 준비(4) Preparation of the backlight unit

The light emitting device prepared as described above, the light guide plate, the light conversion film, the diffusion sheet, the first and the second light collecting sheets were sequentially assembled to prepare a backlight unit according to the ninth embodiment of the present invention. In this case, the light conversion film was disposed on the light guide plate such that a first transparent film faces the light guide plate and a second transparent film faces the diffusion sheet.

[실시예 10]Example 10

(2) 발광 소자의 준비(2) Preparation of Light-Emitting Element

A light emitting device substantially the same as the light emitting device prepared in Example 6 was prepared.

(3) 확산 시트의 준비(3) Preparation of Diffusion Sheet

A diffusion sheet substantially the same as the diffusion sheet prepared in Example 9 was prepared.

(4) 광변환 필름의 준비(4) Preparation of the light conversion film

A second coating composition including a red light emitting composite prepared in a manufacturing process of the diffusion sheet of Example 7 was prepared.

Preparing a first transparent film and a first barrier layer described in Example 1, coating the second coating composition on the first barrier layer, and substantially the same agent as the first transparent film and the first barrier layer A second transparent film and a second barrier layer were prepared, the coating layer was covered in contact with the second barrier layer, and then cured to form a light conversion layer having a thickness of about 100 μm.

(5) 백라이트 유닛의 준비(5) Preparation of the backlight unit

A light emitting device prepared as described above, a light guide plate, the light conversion film, a diffusion sheet, a first and a second light collecting sheet were sequentially assembled to prepare a backlight unit according to Example 10 of the present invention. In this case, the light conversion film was disposed on the light guide plate such that a first transparent film faces the light guide plate and a second transparent film faces the diffusion sheet.

[실시예 11]Example 11

(1) 발광 소자의 준비(1) Preparation of Light-Emitting Element

The light emitting device was prepared in substantially the same manner as in the backlight unit according to the first embodiment.

(2) 역프리즘 보호 시트의 준비(2) Preparation of the anti-prism protection sheet

First, on the surface of a PET film having a thickness of about 125 μm, a composition in which an epoxy acrylate and TPO obtained from BASF Co., Ltd. (Germany) and TPO are mixed at a weight ratio of about 100: 0.8 is coated and cured to have a height of about 3 μm. A buffer pattern having was formed.

On the opposite side of the PET film on which the buffer pattern is formed, a coating composition of urethane acrylate and TPO purchased from BASF Co. This formed optical layer was formed.

(3) 역프리즘 시트의 준비(3) Preparation of inverse prism sheet

Preparing a first barrier layer formed on the first transparent film substantially the same as in the preparation of the diffusion sheet of Example 1, coating the first coating composition prepared in Example 7 on the first barrier layer and Curing to form a first light conversion layer having a thickness of about 50 μm.

Subsequently, a second transparent film and a second barrier layer substantially the same as the first transparent film and the first barrier layer were prepared, and the second coating composition prepared in Example 7 was coated on the second barrier layer. This was cured to form a second light conversion layer having a thickness of about 50 μm.

Subsequently, the first optical layer having a light collecting pattern having a height of about 25 μm was formed on the surface of the first transparent film by coating and curing a composition in which epoxy acrylate and TPO were mixed at a weight ratio of about 100: 0.8. . On the outside of the second transparent film, a composition in which urethane acrylate and TPO were mixed at a weight ratio of about 100: 0.8 was coated and cured to form a second optical layer having a light diffusion pattern formed on a surface thereof.

(4) 도광판의 준비(4) Preparation of the 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. 0.5 parts by weight was mixed to prepare a composition for manufacturing a light guide plate. The light guide plate manufacturing composition was injected into a mold to prepare a light guide plate having a thickness of about 200 μm.

The mold includes an embossed pattern forming a prism pattern having a shape substantially the same as the condensing pattern of the inverted prism sheet, and by using the mold, one surface of the light guide plate has a prism having a shape substantially the same as the condensing pattern of the inverse prism sheet. A pattern was formed.

(5) 백라이트 유닛의 준비(5) Preparation of the backlight unit

The backlight unit according to the eleventh embodiment of the present invention was prepared by assembling the light emitting device prepared as above, the light guide plate, the reverse prism protective sheet, and the reverse prism sheet sequentially stacked. The reverse prism sheet such that the optical layer of the anti-prism protective sheet faces the reverse prism sheet, the buffer pattern of the reverse prism protective sheet faces the light guide plate, and the first optical layer faces the optical layer of the reverse prism protective sheet. And the anti-prism protective sheet was disposed on the light guide plate. The prism pattern of the light guide plate is disposed to face the anti-prism protection sheet, and the arrangement direction of the light emitting element and the extension direction of the condensing pattern of the reverse prism sheet correspond to each other, and the prism pattern of the light guide plate is the inverse prism sheet. It was arranged to intersect with the condensing pattern of.

[실시예 12]Example 12

(1) 발광 소자 및 도광판의 준비(1) Preparation of light emitting element and light guide plate

The light emitting element and the light guide plate were prepared substantially the same as in the backlight unit according to the eleventh embodiment.

After the first photoconversion layer and the second photoconversion layer are disposed to face each other, a composition in which a urethane acrylate and TPO are mixed in an adhesive ratio of about 100: 0.8 by weight is interposed between the first and second layers. Assembly and irradiation with light to form an adhesive layer between the first and second light conversion layer. The thickness of the adhesive layer was about 3 μm.

Subsequently, the first optical layer having a buffer pattern having a height of about 3 μm was formed on the surface of the first transparent film by coating and curing a composition in which epoxy acrylate and TPO were mixed at a weight ratio of about 100: 0.8. . On the outside of the second transparent film, a composition in which urethane acrylate and TPO were mixed at a weight ratio of about 100: 0.8 was coated and cured to form a second optical layer having a light diffusion pattern formed on a surface thereof.

(3) 역프리즘 시트의 준비(3) Preparation of inverse prism sheet

First, on a surface of a PET film having a thickness of about 125 μm, a composition in which an epoxy acrylate and TPO obtained from BASF Co., Ltd. (Germany) and TPO are mixed at a weight ratio of about 100: 0.8 is coated and then cured to have a height of about 25 μm. A condensing pattern having was formed.

On the opposite side of the PET film on which the condensing pattern is formed, a coating composition of urethane acrylate and TPO purchased from BASF Co. This formed optical layer was formed.

(4) 백라이트 유닛의 준비(4) Preparation of the backlight unit

A light emitting device prepared as described above, a light guide plate, a reverse prism protective sheet, and a reverse prism sheet sequentially stacked were assembled to prepare a backlight unit according to a twelfth embodiment of the present invention. A first optical layer of the anti-prism protective sheet faces the light guide plate, a second optical layer of the anti-prism protective sheet faces the anti-prism sheet, and an optical layer of the anti-prism sheet The reverse prism sheet and the reverse prism protective sheet were disposed on the light guide plate so as to face the second optical layer.

[비교예 1]Comparative Example 1

A backlight unit substantially the same as the backlight unit according to Example 1 was prepared as a backlight unit according to Comparative Example 1, except that the diffusion sheet described in Example 9 was used as the diffusion sheet and a light emitting device was prepared as follows. It was.

The light emitting device is a YAG phosphor (YAG Phosphor) purchased from Nichia (Japan) and Dow Corning (company name) on a blue light emitting chip having an emission peak at about 444 nm purchased from Nichia (Japan). , A) and B kit of OE-6630 (trade name) purchased from the United States) was prepared by molding a mixture of a thermosetting silicone resin mixed in a 1: 4 ratio and then cured at 150 ℃ for 2 hours.

[비교예 2]Comparative Example 2

A back light unit substantially the same as the back light unit according to Example 9 was prepared as a back light unit according to Comparative Example 2, except that an optical sheet prepared as described below was used as the light conversion film.

First, red nano light-emitting body (trade name: Nanodot-HE-610, QD solution, Korea) and green nano light-emitting body (trade name: Nanodot-HE-530, QD solution, Korea) about 100 parts by weight of urethane acrylate A coating composition was prepared by mixing with 0.8 parts by weight of a composition having a mixed TPO.

After coating the coating composition on a PET film having a thickness of about 38 μm as a first base substrate, a second base substrate substantially identical to the first base substrate is disposed on the coating layer, and the coating layer is cured to thereby convert the light. A film was prepared.

[비교예 3]Comparative Example 3

A backlight unit substantially the same as the backlight unit according to Example 1 was prepared as a backlight unit according to Comparative Example 3, except that a diffusion sheet prepared as described below was used as the diffusion sheet.

First, the coating composition prepared in Comparative Example 2 was coated on a PET film having a thickness of about 38 μm, and then a barrier layer and a transparent film were sequentially stacked, and then the coating layer was cured to form a light conversion layer. In this case, the barrier layer and the transparent film were prepared to be substantially the same as the first transparent film and the first barrier layer prepared in Example 1.

Subsequently, on the other side of the base substrate on which the light conversion layer is formed, a coating of a urethane acrylate and TPO obtained from BASF Co., Ltd. (Germany) and TPO in a weight ratio of about 100: 0.8 is coated, followed by curing. The optical layer in which the diffusion pattern was formed was formed.

[실험 1]- 표시 장치의 색좌표 및 색재현 영역 평가[Experiment 1]-Evaluation of color coordinate and color reproduction area of display device

Each of the backlight units according to Examples 1 to 12 and Comparative Examples 1 to 3 of the present invention was assembled with a display panel of an iPhone 4 (trade name, Apple, USA) to prepare display devices 1 to 12 and comparison devices 1 to 3. .

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 12 and the comparison devices 1 to 3. , 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. Each of the luminance and the color coordinates means an average value of values measured at nine points in 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 emitting element is disposed in the backlight unit. do. The measured luminance and color coordinate results are shown in Table 1 below.

In Table 1, 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 the comparison device for the gamut range (hereinafter referred to as 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 1

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	86	351	0.635, 0.314	0.242, 0.675	0.165, 0.053
Indicator 2	87.8	348	0.638, 0.316	0.233, 0.678	0.165, 0.053
Indicator 3	76.6	347	0.633, 0.316	0.239, 0.611	0.163, 0.053
Indicator 4	75.9	349	0.631, 0.315	0.240, 0.610	0.164, 0.053
Indicator 5	86.3	349	0.635, 0.315	0.241, 0.677	0.167, 0.052
Indicator 6	74	347	0.623, 0.311	0.237, 0.605	0.164, 0.054
Indicator 7	87.4	348	0.636, 0.313	0.231, 0.677	0.166, 0.053
Indicator 8	75.7	345	0.631, 0.314	0.241, 0.609	0.164, 0.053
Indicator 9	84.2	356	0.634, 0.311	0.229, 0.657	0.164, 0.055
Indicator 10	73.6	341	0.624, 0.310	0.235, 0.601	0.165, 0.055
Indicator 11	82.5	343	0.632, 0.313	0.253, 0.663	0.164, 0.053
Indicator 12	81.4	348	0.633, 0.311	0.257, 0.655	0.165, 0.054
Comparison device 1	51.3	314	0.611, 0.354	0.318, 0.564	0.160, 0.123
Comparator 2	61	176	0.605, 0.362	0.305, 0.582	0.157, 0.047
Comparator 3	62.2	179	0.606, 0.361	0.302, 0.584	0.157, 0.043

Referring to Table 1, the gamut ratio of the comparison apparatus 1 including the backlight unit according to Comparative Example 1 is about 51.3% of the NTSC gamut range, whereas the gamut ratio of the display devices 1 to 12 is about 73.6% of the NTSC gamut range. From about 87.8%, it can be seen that the display devices 1 to 12 have a significantly wider color reproduction area than the comparison device 1. In addition, the gamut ratios of the

comparison devices

2 and 3 including the backlight units according to Comparative Examples 2 and 3 are about 61% and 62.2%, respectively, and the display devices 1 to 12 have a significantly wider color than the

comparison devices

2 and 3. It can be seen that it has a reproduction area. Since the comparison device 1 uses the backlight unit to which the nano light-emitting body is not applied, the comparison device 1 has the narrowest color reproduction region among the display devices 1 to 12 and the comparison devices 1 to 3.

In comparison, each of the

comparative apparatuses

2 and 3, although nanolumines are applied to the backlight unit, agglomeration between the nanolumines in the step of forming a coating layer including the nanolumines in the process of manufacturing the diffusion sheet. ) To generate a wavelength shift of light emitted by the nano light-emitting bodies to have a color reproduction area that is narrower than that of the display devices 1 to 12. In particular, the green color coordinates of the

comparison devices

2 and 3 have a value smaller than the green x coordinate of the comparison device 1 and a value larger than the green y coordinate of the comparison device 1, but are significantly larger than the green x coordinates of the display devices 1 to 12. It has a value and is significantly smaller than the green y coordinate of the display devices 1 to 12, it can be seen that the color purity of the green using the nano light-emitting body is a low level. In addition, it can be seen from the red color coordinates of the

comparison devices

2 and 3 that the

comparison devices

2 and 3 realize a red color having a lower color purity than the display devices 1 to 12.

On the other hand, since the display devices 1 to 12 according to the present invention use a light-emitting composite or fluorescent particles containing a nano light-emitting body, the aggregation phenomenon hardly occurs and thus there is no problem of the wavelength shift.

On the other hand, although the display devices 1 to 12 have a wider color reproduction area and higher luminance than the comparison devices 1 to 3, among the display devices 1 to 12, the green y coordinates of the

display devices

3, 4, 6, 8, and 10 are displayed. It can be seen that the

device

1, 2, 5, 7, 9, 11 and 12 has a small value compared to the green y coordinate. In addition, it can be seen that the green x coordinate of the

display devices

3, 4, 6, 8, and 10 has a larger value than the green x coordinate of the

display devices

1, 2, 5, 7, 9, 11, and 12. That is, the color purity of green represented by the

display devices

1, 2, 5, 7, 9, 11, and 12 to which the green nano light-emitting body having a half width smaller than that of the green fluorescent particles is applied is displayed to the

display devices

3, 4, 6, It turns out that it is good compared with the green color purity which 8 and 10 show.

평판 시트 1, 2, 3 및 비교 시트 1, 2의 제조Preparation of Flat Sheets 1, 2, 3 and Comparative Sheets 1, 2

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

A first barrier layer formed on the first transparent film was prepared in substantially the same manner as in the preparation of the diffusion sheet of Example 2, and the urethane acrylate, the red light emitting composite, the green light emitting composite and A coating layer was formed by coating a coating composition substantially the same as the coating composition prepared in the manufacturing process of the diffusion sheet of Example 1, in which the photoinitiator was mixed, to a thickness of about 100 μm.

Accordingly, a flat sheet sheet 1 in which a first transparent film, a first barrier layer, a light conversion layer formed by curing the coating layer, a second barrier layer, and a second transparent film were sequentially stacked was manufactured.

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

The coating composition in which the urethane acrylate, the red light-emitting composite, the fluorescent composite, and the photoinitiator were mixed in the process for producing the diffusion sheet of Example 4 was mixed with the first barrier of the first transparent film and the first barrier layer described in Example 1. Coating on the layer to a thickness of about 100 ㎛ to form a coating layer. Preparing a first transparent film and a second transparent film and a second barrier layer substantially the same as the first barrier layer to cover the coating layer on the coating layer in contact with the second barrier layer, by irradiating light to the coating layer The photoconversion layer was formed by hardening.

Accordingly, a flat sheet sheet 2 in which a first transparent film, a first barrier layer, a light conversion layer formed by curing the coating layer, a second barrier layer, and a second transparent film were sequentially stacked was manufactured.

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

About 0.8 weight of red nano light-emitting body (brand name: Nanodot-HE-610, QD solution, Korea) and green nano light-emitting body (brand name: Nanodot-HE-530, QD solution, Korea) with respect to 100 parts by weight of urethane acrylate The coating composition was prepared by mixing with a composition having a negatively mixed TPO. The coating composition was coated on a first PET film having a thickness of about 38 μm, covered with a second PET film having a thickness of about 38 μm, and then cured to prepare Comparative Sheet 1 including a light conversion layer having a thickness of about 100 μm. Prepared.

[실험 2]- 광 안정성 및 열/수분 안정성 평가[Experiment 2]-Evaluation of light stability and heat / moisture stability

For each of the

flat sheets

1, 2 and comparative sheet 1 prepared as described above, after irradiating ultraviolet (UV) light having a central wavelength of 365 nm for 1 day (24 hours) at a radiation intensity of about 1.4 mW / cm ² , The day 1 quantum efficiency (unit:%) was measured using the quantum efficiency meter (brand name: C9920-02, HAMAMATSU, Japan). Subsequently, after 24 hours under substantially the same conditions as the harsh conditions, day 2 quantum efficiency (unit:%) was measured, and in this manner, quantum efficiency for 30 days was measured. The difference between the maximum value and the minimum value among the quantum efficiency values measured for 30 days was calculated to evaluate ultraviolet stability for

Flat Sheets

1, 2 and Comparative Sheet 1. The results are shown in Table 2.

In addition, with respect to the

flat sheet

1, 2 and Comparative Sheet 1 prepared as described above, the first day quantum efficiency (unit) after exposure to harsh conditions of temperature 85 ℃ and relative humidity 85% in a constant temperature and humidity chamber for 1 day (24 hours) :%), And after 24 hours under substantially the same conditions as the harsh conditions, day 2 quantum efficiency (unit:%) was measured. The difference between the maximum value and the minimum value among the quantum efficiency values measured for 30 days was calculated to evaluate the heat / moisture stability for the

flat sheets

1, 2 and the comparative sheet 1. The results are shown in Table 3.

In Tables 2 and 3, when the quantum efficiency could not be measured because it did not emit light after being exposed to harsh conditions, it is indicated by "-". The unit of each numerical value of Table 2 and Table 3 represents "%".

TABLE 2

UV stability	Flatbed Sheet	1	Flat Sheet 2	Comparison Sheet 1
First quantum efficiency	90.1	75.7	60.8
Day 1	89.9	75.3	60.7
Day 2	89.7	75.4	51.2
Day 3	89.7	75.3	48.3
Day 4	89.6	75.6	37.8
Day 5	89.8	75.2	29.7
Day 6	89.7	75.5	18.8
Day 7	89.6	75.2	9.7
Day 8	89.5	75.2	2.3
Day 9	89.3	75.1	-
Day 10	89.4	74.8	-
Day 11	88.3	75.2	-
Day 12	89.2	74.7	-
Day 13	88.0	74.8	-
Day 14	88.1	75.1	-
Day 15	87.9	74.5	-
Day 16	87.6	74.1	-
Day 17	87.3	74.6	-
Day 18	87.4	74.3	-
Day 19	86.9	74.3	-
Day 20	87.1	74.4	-
Day 21	86.7	74.1	-
Day 22	86.8	73.9	-
Day 23	86.5	73.7	-
Day 24	86.6	73.5	-
Day 25	86.3	73.7	-
Day 26	86.2	73.4	-
Day 27	86.4	72.9	-
Day 28	86.1	72.5	-
Day 29	86.3	72.1	-
Day 30	86.2	71.8	-

Referring to Table 2, the quantum efficiency immediately after the production of the flat sheet 1 is about 90.1%, and the quantum efficiency immediately after the production of the flat sheet 2 is about 75.7%, while the quantum efficiency immediately after the production of the comparative sheet 1 is about It can be seen that it is 60.8%.

It can be seen that the quantum efficiency after 30 days has elapsed under severe conditions of ultraviolet rays is about 86.2% for flat sheet 1, about 71.8% for flat sheet 2, and cannot be measured in the case of comparative sheet 1. That is, even under the harsh conditions of UV light, the quantum efficiency is only about 4.3% lower than the initial quantum efficiency when the initial quantum efficiency is 100%, and the flat sheet 2 is about 5.2% lower than the initial quantum efficiency. In addition, it can be seen that the nano light-emitting body applied to Comparative Sheet 1 is damaged by ultraviolet rays and does not emit light. In particular, Comparative Sheet 1 is not ready to measure the quantum efficiency at about 9 days, that is, the nano light-emitting body is damaged, whereas the

flat sheet

1 or 2 according to the present invention even under severe conditions of ultraviolet light It can be seen that the degree of damage is minimal.

Therefore, compared with the comparative sheet 1, it can be said that the ultraviolet stability of the

flat sheet

1 or 2 which concerns on this invention is very high.

TABLE 3

Heat / moisture stability	Flatbed Sheet	1	Flat Sheet 2	Comparison Sheet 1
First quantum efficiency	90.1	75.7	60.8
Day 1	89.8	75.5	60.6
Day 2	89.7	75.3	20.3
Day 3	89.9	75.6	2.5
Day 4	89.6	75.2	-
Day 5	89.3	75.3	-
Day 6	89.5	75.4	-
Day 7	89.2	74.9	-
Day 8	89.1	75.1	-
Day 9	89.3	74.8	-
Day 10	89.0	75.0	-
Day 11	88.7	74.9	-
Day 12	89.1	74.8	-
Day 13	88.5	74.7	-
Day 14	87.8	74.9	-
Day 15	86.9	74.5	-
Day 16	86.7	74.1	-
Day 17	86.2	73.9	-
Day 18	85.7	74.2	-
Day 19	85.8	73.8	-
Day 20	85.6	73.4	-
Day 21	85.0	73.1	-
Day 22	85.3	72.8	-
Day 23	84.9	72.7	-
Day 24	84.6	72.5	-
Day 25	84.5	71.6	-
Day 26	84.3	70.2	-
Day 27	84.5	68.8	-
Day 28	84.2	67.9	-
Day 29	84.1	65.4	-
Day 30	84.3	64.9	-

Referring to Table 3, the quantum efficiency after 30 days under severe conditions with a temperature of 85 ° C. and a relative humidity of 85% is about 84.3% for flat sheet 1, about 64.9% for flat sheet 2, and for comparative sheet 1 It can be seen that it cannot be measured. In other words, the flat sheet 1 has a quantum efficiency of about 90.1% to about 84.3% and a difference of about 5.8% even under the harsh conditions of 85 ° C. and 85% relative humidity. It is only about 6.4% lower than quantum efficiency. In addition, it can be seen that the flat sheet 2 is reduced by about 14.2% compared to the initial quantum efficiency when the initial quantum efficiency is 100% under severe conditions of 85 ° C. and 85% relative humidity. On the other hand, in the case of Comparative Sheet 1, it can be seen that the nano light-emitting body applied to Comparative Sheet 1 does not emit light under the influence of high temperature / high humidity. In particular, Comparative sheet 1 is not already able to measure the quantum efficiency at the time of about 4 days, that is, the nano light-emitting body is damaged, whereas the

flat sheet

1 or 2 according to the present invention under the harsh conditions of high temperature / high humidity It can also be seen that the degree of damage is minimal.

Therefore, compared with the comparative sheet 1, the heat / moisture stability of the

flat sheet

1 or 2 which concerns on this invention can be said to be very high.

As described with reference to Tables 2 and 3, the luminescent composite applied to the optical sheet according to the present invention is not only very stable to light, heat or moisture by itself by including wax particles, but also the optical sheet includes a barrier layer. As a result, stability to light and heat / moisture can be improved. In addition, it can be seen that the light-emitting composite applied to the optical sheet according to the present invention is hardly damaged even when the sheet is manufactured by mixing and curing the composition for manufacturing a sheet such as urethane acrylate.

[실험 3]- 색좌표 균일도 평가[Experiment 3]-Evaluation of Color Coordinate Uniformity

초기 색좌표 균일도 평가Initial color coordinate uniformity evaluation

For each of the backlight units according to Examples 1 to 12 and the backlight units according to Comparative Examples 1 to 3 of the present invention, an initial color coordinate at each of 24 points of the backlight unit is shown in a spectroradiometer as shown in FIG. 19. Measurement was carried out using SR-3AR (product name, TOPCON, Japan). The results are shown in Tables 4, 5, 6 and 7.

In FIG. 19, 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 is a point adjacent to the light source LS in the display area DS. 1, 2, 3 and 4 are light incidence parts, and points 21, 22, 23 and 24 opposite to the light incidence part are light incidence parts. When the horizontal length of the display area DS is referred to as "a" and the longitudinal length is referred to as "b", each of the

points

1, 2, 3, and 4 is located from the first edge of the display area DS adjacent to the light incident part. spaced "a / 12" and each of the

points

21, 22, 23, and 24 is spaced "a / 12" from the second edge of the display area DS corresponding to the light portion. Also, points 1, 5, 9, 13, 17 and 21 each from the third edge connecting the first and second edges are spaced apart by “b / 8” and from the fourth edge facing the third edge.

Points

4, 8, 12, 16, 20 and 24 are each spaced apart by "b / 8".

Points

1, 2, 3, and 4 are each “a / 6” apart from

points

5, 6, 7, and 8, and points 5, 6, 7, and 8 are each of

points

9, 10, 11, and 12, and “ a / 6 "apart, points 9, 10, 11, and 12 are each spaced 13, 14, 15, and 16" a / 6 "apart, and points 13, 14, 15, and 16 are each spaced 17, Spaces "a / 6" with 18, 19 and 20 respectively, and points 17, 18, 19 and 20 are spaced "a / 6" with each of

points

21, 22, 23 and 24 respectively. At the same time, points 1, 5, 9, 13, 17, and 21 are each spaced apart by "b / 4" from

points

2, 6, 10, 14, 18, and 22, respectively, and points 2, 6, 10, 14, 18, and 22 are each “b / 4” apart from

points

3, 7, 11, 15, 19, and 23, and each of

points

3, 7, 11, 15, 19, and 23 is 4, 8, 12, 16, 20, respectively. And 24 by " b / 4 "

In Tables 4, 5, 6 and 7, initial color coordinates are shown based on the CIE 1931 color coordinate system. In each of Tables 4, 5, 6 and 7, "Δx" is the difference between the maximum value and the minimum value of the x-coordinate in the points 1 to 24, and "Δy" is the y-coordinate in the points 1 to 24. The difference between the maximum and minimum values.

Table 4

Point	Example 1	Example 2	Example 3	Example 4
One	0.274,0.280	0.272,0.274	0.279,0.283	0.277,0.285
2	0.276,0.281	0.274,0.271	0.279,0.282	0.279,0.283
3	0.279,0.283	0.272,0.273	0.281,0.284	0.282,0.285
4	0.276,0.285	0.274,0.275	0.286,0.287	0.285,0.283
5	0.275,0.284	0.272,0.274	0.295,0.288	0.290,0.289
6	0.276,0.282	0.276,0.275	0.294,0.289	0.286,0.286
7	0.276,0.283	0.275,0.276	0.296,0.290	0.287,0.287
8	0.277,0.284	0.276,0.274	0.301,0.291	0.288,0.288
9	0.279,0.282	0.274,0.272	0.302,0.292	0.284,0.291
10	0.278,0.285	0.275,0.275	0.297,0.289	0.285,0.282
11	0.276,0.284	0.276,0.274	0.294,0.287	0.286,0.285
12	0.279,0.288	0.275,0.273	0.295,0.288	0.285,0.273
13	0.276,0.287	0.276,0.277	0.296,0.291	0.286,0.277
14	0.277,0.283	0.274,0.273	0.301,0.291	0.288,0.273
15	0.276,0.282	0.276,0.274	0.302,0.292	0.287,0.274
16	0.276,0.284	0.275,0.274	0.299,0.289	0.285,0.274
17	0.279,0.285	0.276,0.275	0.298,0.289	0.284,0.275
18	0.276,0.283	0.276,0.276	0.293,0.292	0.286,0.276
19	0.277,0.284	0.276,0.274	0.301,0.294	0.287,0.274
20	0.276,0.283	0.275,0.275	0.303,0.293	0.283,0.275
21	0.276,0.285	0.276,0.274	0.292,0.290	0.282,0.274
22	0.277,0.284	0.275,0.276	0.301,0.290	0.287,0.276
23	0.274,0.281	0.275,0.277	0.301,0.291	0.284,0.277
24	0.275,0.281	0.274,0.276	0.302,0.292	0.283,0.276
Δx	0.005	0.004	0.024	0.011
△ y	0.008	0.006	0.012	0.012

Table 5

Point	Example 5	Example 6	Example 7	Example 8
One	0.275,0.273	0.274,0.282	0.273,0.277	0.275,0.283
2	0.275,0.272	0.278,0.281	0.275,0.280	0.277,0.284
3	0.273,0.272	0.283,0.284	0.278,0.282	0.279,0.286
4	0.273,0.274	0.284,0.285	0.277,0.283	0.282,0.283
5	0.273,0.273	0.291,0.290	0.276,0.284	0.285,0.285
6	0.275,0.275	0.287,0.288	0.275,0.283	0.286,0.287
7	0.274,0.275	0.287,0.287	0.277,0.283	0.285,0.286
8	0.277,0.275	0.287,0.288	0.277,0.285	0.288,0.287
9	0.276,0.273	0.285,0.292	0.279,0.284	0.285,0.290
10	0.275,0.275	0.284,0.283	0.277,0.285	0.286,0.284
11	0.275,0.274	0.285,0.285	0.275,0.283	0.287,0.287
12	0.274,0.274	0.284,0.274	0.278,0.285	0.286,0.275
13	0.277,0.276	0.286,0.276	0.277,0.286	0.285,0.277
14	0.275,0.273	0.288,0.273	0.278,0.284	0.286,0.275
15	0.277,0.275	0.286,0.274	0.277,0.281	0.286,0.274
16	0.274,0.274	0.286,0.274	0.276,0.282	0.285,0.275
17	0.275,0.275	0.285,0.275	0.278,0.283	0.286,0.275
18	0.275,0.277	0.285,0.278	0.277,0.285	0.285,0.277
19	0.277,0.275	0.286,0.276	0.276,0.284	0.286,0.274
20	0.276,0.275	0.284,0.277	0.275,0.283	0.286,0.276
21	0.275,0.274	0.283,0.274	0.276,0.284	0.283,0.274
22	0.274,0.277	0.286,0.277	0.277,0.284	0.285,0.276
23	0.274,0.276	0.283,0.277	0.275,0.282	0.283,0.276
24	0.275,0.276	0.284,0.276	0.274,0.281	0.283,0.277
Δx	0.004	0.017	0.006	0.012
△ y	0.005	0.019	0.009	0.016

Table 6

Point	Example 9	Example 10	Example 11	Example 12
One	0.275,0.269	0.287,0.277	0.274,0.269	0.273,0.273
2	0.276,0.273	0.284,0.280	0.274,0.268	0.275,0.271
3	0.273,0.273	0.285,0.282	0.275,0.268	0.272,0.272
4	0.275,0.275	0.287,0.285	0.277,0.269	0.273,0.275
5	0.274,0.275	0.291,0.287	0.276,0.271	0.275,0.275
6	0.276,0.275	0.293,0.288	0.277,0.273	0.274,0.275
7	0.277,0.273	0.296,0.291	0.276,0.275	0.276,0.275
8	0.276,0.274	0.301,0.292	0.277,0.276	0.277,0.276
9	0.275,0.273	0.300,0.291	0.279,0.274	0.276,0.273
10	0.274,0.275	0.298,0.288	0.276,0.275	0.274,0.275
11	0.275,0.273	0.296,0.286	0.275,0.273	0.275,0.273
12	0.273,0.275	0.295,0.287	0.277,0.275	0.274,0.274
13	0.276,0.275	0.294,0.290	0.276,0.276	0.275,0.276
14	0.274,0.276	0.301,0.293	0.275,0.274	0.275,0.275
15	0.276,0.274	0.302,0.291	0.277,0.275	0.276,0.276
16	0.274,0.275	0.298,0.291	0.275,0.276	0.276,0.274
17	0.276,0.275	0.297,0.288	0.278,0.278	0.276,0.276
18	0.277,0.276	0.296,0.291	0.277,0.275	0.275,0.276
19	0.276,0.275	0.298,0.292	0.275,0.274	0.276,0.275
20	0.275,0.275	0.301,0.292	0.276,0.273	0.276,0.275
21	0.275,0.276	0.297,0.290	0.276,0.275	0.275,0.273
22	0.275,0.275	0.301,0.289	0.278,0.275	0.274,0.275
23	0.276,0.277	0.299,0.290	0.275,0.272	0.276,0.275
24	0.276,0.275	0.301,0.291	0.273,0.274	0.275,0.276
Δx	0.004	0.018	0.005	0.008
△ y	0.008	0.016	0.008	0.006

TABLE 7

Point	Comparative Example 1	Comparative Example 2	Comparative Example 3
One	0.289,0.282	0.245,0.233	0.240,0.231
2	0.291,0.281	0.251,0.241	0.243,0.235
3	0.292,0.283	0.252,0.243	0.245,0.238
4	0.293,0.284	0.253,0.244	0.243,0.241
5	0.294,0.285	0.254,0.245	0.244,0.242
6	0.296,0.284	0.256,0.244	0.246,0.244
7	0.297,0.285	0.257,0.245	0.248,0.245
8	0.298,0.286	0.258,0.246	0.247,0.246
9	0.297,0.284	0.257,0.244	0.246,0.244
10	0.295,0.285	0.255,0.245	0.245,0.245
11	0.298,0.286	0.258,0.246	0.246,0.244
12	0.295,0.283	0.255,0.243	0.247,0.245
13	0.293,0.284	0.253,0.244	0.244,0.244
14	0.296,0.285	0.256,0.245	0.246,0.246
15	0.298,0.285	0.258,0.245	0.244,0.247
16	0.299,0.286	0.259,0.246	0.249,0.245
17	0.301,0.289	0.256,0.247	0.246,0.247
18	0.302,0.291	0.255,0.245	0.245,0.244
19	0.304,0.293	0.254,0.248	0.244,0.243
20	0.302,0.297	0.256,0.247	0.246,0.246
21	0.301,0.301	0.257,0.248	0.248,0.248
22	0.303,0.304	0.257,0.249	0.249,0.249
23	0.304,0.303	0.258,0.245	0.252,0.251
24	0.307,0.302	0.255,0.246	0.251,0.252
Δx	0.018	0.013	0.012
△ y	0.023	0.016	0.021

Referring to Tables 4 to 7, in the backlight unit according to Comparative Example 1, the light units closer to the light source, that is, the color coordinates of points 1 to 4 are x-coordinates than the color coordinates of points 21 to 24, which are light units facing the light receiver. It can be seen that Δx is 0.018 and Δy is 0.023 while both y coordinates have small values. On the other hand, in the backlight units according to

Embodiments

1, 2, 4 to 9, 11, and 12, Δx may be 0.017 or less, and Δy may be 0.019 or less. That is, it can be seen that the color coordinate uniformity of the backlight unit according to Examples 1, 2, 4 to 9, 11, and 12 is better than that of the backlight unit according to Comparative Example 1. As Δx and Δy are larger, the difference between the color coordinates of the light incident part and the color coordinates of the light exiting part is larger, so the user perceives that blue color is relatively strong at the light exiting part, and yellow is relatively strong at the light exiting part. There is a problem to admit. However, the backlight unit according to Examples 1, 2, 4 to 9, 11, and 12 of the present invention reduces Δx and Δy as compared with Comparative Example 1, thereby improving color coordinate uniformity.

In particular, it can be seen that Δx is 0.008 or less and Δy is 0.009 or less in the backlight unit according to

Embodiments

1, 2, 5, 7, 9, 11, and 12. ? X of the backlight unit according to Examples 1, 2, 5, 7, 9, 11 and 12 to which the light emitting composite was applied, rather than the backlight unit according to

Embodiments

4, 6 and 8, wherein the fluorescent particles were applied to the light emitting element or the diffusion sheet. Δy has a relatively small value. Among the backlight units according to Embodiments 1 to 12, it can be seen that the color coordinate uniformity of the backlight units according to

Embodiments

1, 2, 5, 7, 9, 11, and 12 is good.

In addition, the backlight units according to Comparative Examples 2 and 3 have smaller Δx and Δy than the backlight units according to Comparative Example 1, but compared to Examples 1, 2, 4, 5, 7, 9, 11 and 12, respectively. Since x and Δy have large values, it can be seen that the color coordinate uniformity of the backlight unit according to Examples 1, 2, 4, 5, 7, 9, 11 and 12 is better than that of the backlight units according to Comparative Examples 2 and 3. have. That is, the backlight unit according to Comparative Examples 2 and 3 to which the nano light-emitting body is applied has better color coordinate uniformity than the backlight unit according to Comparative Example 1, which is commonly used, but the examples 1, 2, 4, 5, 7, 9, 11 and It can be seen that it is worse than the color coordinate uniformity of the backlight unit according to 12.

On the other hand, the backlight unit according to the third embodiment of the present invention, as described in Table 1, the color gamut ratio or brightness is better than the backlight units according to Comparative Examples 1 to 3, it can be seen that the color coordinate uniformity is relatively low. When comparing the backlight units according to Examples 3 and 4, the fluorescent particles can be more uniformly dispersed in the light conversion layer when the green phosphor is used as a fluorescent composite coated with wax particles, rather than using the green phosphor as it is. It can be inferred that the uniformity is better.

Final color coordinate uniformity evaluation

After the initial color coordinate uniformity evaluation, the diffusion sheet was separated from each of the backlight units according to Examples 1 to 8, the light conversion film was separated from each of Examples 9 and 10, and the anti-prism sheet was separated from the backlight unit according to Example 11. After separating the protective sheet from the backlight unit according to Example 12, each of the separated diffusion sheet, the light conversion film, the inverted prism sheet and the protective sheet was 480 under severe conditions of a temperature of 85 ° C. and a relative humidity of 85%. It was left for hours. The diffusion sheet, the light conversion film, the inverted prism sheet, and the protective sheet, which were left at high temperature / high humidity, were assembled together with the light emitting element, the light guide plate, the first and the second light collecting sheets which constituted the respective backlight units, and then Color coordinates were measured. The results are shown in Tables 8, 9, 10, and 11.

In Tables 8, 9, 10 and 11, the final color coordinates are shown based on the CIE 1931 color coordinate system. In each of Tables 8, 9, 10 and 11, "Δx" is the difference between the maximum value and the minimum value of the x coordinate in points 1 to 24, and "Δy" is the value of the y coordinate in points 1 to 24. The difference between the maximum and minimum values.

Table 8

Point	Example 1	Example 2	Example 3	Example 4
One	0.213,0.212	0.263,0.263	0.246,0.241	0.201,0.242
2	0.212,0.213	0.262,0.262	0.248,0.243	0.207,0.246
3	0.214,0.211	0.265,0.265	0.249,0.245	0.209,0.245
4	0.212,0.214	0.262,0.264	0.245,0.242	0.205,0.243
5	0.216,0.215	0.263,0.263	0.245,0.248	0.206,0.243
6	0.258,0.260	0.271,0.271	0.261,0.255	0.249,0.245
7	0.257,0.259	0.273,0.273	0.263,0.258	0.251,0.247
8	0.214,0.216	0.266,0.264	0.247,0.247	0.205,0.244
9	0.215,0.217	0.265,0.263	0.246,0.246	0.202,0.241
10	0.267,0.270	0.272,0.272	0.272,0.269	0.265,0.262
11	0.266,0.269	0.273,0.271	0.273,0.270	0.268,0.260
12	0.214,0.216	0.264,0.264	0.246,0.245	0.203,0.243
13	0.217,0.216	0.263,0.266	0.245,0.247	0.204,0.242
14	0.268,0.272	0.274,0.272	0.275,0.272	0.267,0.262
15	0.271,0.273	0.273,0.273	0.276,0.271	0.266,0.261
16	0.214,0.215	0.263,0.265	0.248,0.247	0.204,0.245
17	0.216,0.216	0.263,0.264	0.244,0.246	0.201,0.240
18	0.259,0.262	0.275,0.274	0.265,0.259	0.253,0.249
19	0.255,0.261	0.274,0.272	0.269,0.261	0.256,0.252
20	0.213,0.215	0.266,0.265	0.247,0.245	0.203,0.242
21	0.214,0.212	0.265,0.262	0.244,0.242	0.202,0.243
22	0.215,0.215	0.263,0.265	0.247,0.244	0.206,0.247
23	0.213,0.217	0.264,0.264	0.248,0.246	0.207,0.246
24	0.214,0.213	0.263,0.261	0.243,0.241	0.203,0.242
Δx	0.059	0.013	0.033	0.067
△ y	0.062	0.013	0.031	0.021

Table 9

Point	Example 5	Example 6	Example 7	Example 8
One	0.262,0.261	0.282,0.260	0.260,0.258	0.245,0.258
2	0.265,0.267	0.290,0.263	0.263,0.263	0.247,0.260
3	0.264,0.262	0.291,0.262	0.264,0.262	0.249,0.261
4	0.263,0.264	0.293,0.261	0.261,0.260	0.243,0.260
5	0.263,0.264	0.291,0.260	0.263,0.261	0.245,0.263
6	0.269,0.265	0.287,0.277	0.270,0.273	0.249,0.277
7	0.268,0.267	0.286,0.273	0.271,0.275	0.248,0.276
8	0.267,0.265	0.293,0.265	0.262,0.262	0.248,0.247
9	0.264,0.264	0.288,0.269	0.262,0.259	0.246,0.262
10	0.271,0.271	0.293,0.279	0.274,0.279	0.256,0.281
11	0.272,0.270	0.295,0.280	0.275,0.281	0.257,0.283
12	0.266,0.265	0.291,0.266	0.261,0.262	0.245,0.246
13	0.265,0.263	0.290,0.271	0.262,0.261	0.247,0.263
14	0.274,0.272	0.294,0.278	0.275,0.280	0.260,0.283
15	0.276,0.274	0.296,0.281	0.276,0.283	0.259,0.284
16	0.267,0.266	0.293,0.264	0.262,0.263	0.247,0.246
17	0.262,0.264	0.292,0.268	0.263,0.262	0.244,0.261
18	0.270,0.268	0.296,0.278	0.272,0.276	0.250,0.287
19	0.271,0.267	0.294,0.279	0.273,0.277	0.251,0.284
20	0.264,0.265	0.294,0.263	0.261,0.260	0.246,0.247
21	0.263,0.262	0.289,0.261	0.261,0.256	0.243,0.259
22	0.264,0.268	0.287,0.264	0.262,0.261	0.246,0.262
23	0.265,0.264	0.288,0.265	0.264,0.260	0.248,0.260
24	0.262,0.262	0.285,0.262	0.262,0.258	0.241,0.257
Δx	0.014	0.014	0.016	0.019
△ y	0.013	0.021	0.025	0.038

Table 10

Point	Example 9	Example 10	Example 11	Example 12
One	0.258,0.253	0.287,0.263	0.252,0.251	0.255,0.252
2	0.261,0.260	0.285,0.265	0.256,0.254	0.259,0.255
3	0.262,0.261	0.289,0.263	0.255,0.256	0.257,0.253
4	0.256,0.254	0.288,0.261	0.253,0.250	0.256,0.249
5	0.254,0.255	0.288,0.264	0.256,0.253	0.255,0.256
6	0.264,0.269	0.292,0.279	0.262,0.262	0.260,0.260
7	0.263,0.268	0.295,0.278	0.261,0.261	0.261,0.261
8	0.256,0.255	0.295,0.262	0.257,0.255	0.256,0.254
9	0.255,0.256	0.299,0.265	0.254,0.255	0.252,0.253
10	0.264,0.271	0.297,0.281	0.268,0.265	0.264,0.268
11	0.265,0.272	0.295,0.280	0.269,0.266	0.266,0.266
12	0.254,0.256	0.294,0.263	0.255,0.254	0.255,0.253
13	0.253,0.255	0.289,0.262	0.255,0.253	0.253,0.255
14	0.266,0.272	0.302,0.283	0.270,0.267	0.265,0.267
15	0.265,0.273	0.303,0.282	0.269,0.265	0.267,0.269
16	0.255,0.255	0.296,0.264	0.256,0.255	0.256,0.256
17	0.255,0.256	0.299,0.263	0.254,0.254	0.253,0.256
18	0.266,0.270	0.296,0.277	0.263,0.260	0.261,0.259
19	0.265,0.269	0.297,0.276	0.262,0.261	0.263,0.260
20	0.257,0.255	0.295,0.263	0.254,0.253	0.265,0.254
21	0.256,0.251	0.298,0.262	0.250,0.249	0.249,0.254
22	0.259,0.258	0.297,0.266	0.255,0.255	0.250,0.256
23	0.258,0.257	0.289,0.267	0.253,0.254	0.251,0.252
24	0.253,0.250	0.297,0.263	0.249,0.248	0.248,0.247
Δx	0.013	0.018	0.021	0.017
△ y	0.023	0.022	0.019	0.022

Table 11

Point	Comparative Example 1	Comparative Example 2	Comparative Example 3
One	0.291,0.282	0.138,0.121	0.153,0.142
2	0.293,0.281	0.141,0.123	0.159,0.144
3	0.294,0.283	0.140,0.125	0.156,0.145
4	0.292,0.284	0.135,0.122	0.154,0.140
5	0.293,0.285	0.145,0.121	0.153,0.144
6	0.301,0.298	0.176,0.165	0.196,0.187
7	0.303,0.297	0.167,0.158	0.204,0.185
8	0.301,0.296	0.143,0.123	0.155,0.146
9	0.302,0.297	0.147,0.124	0.154,0.143
10	0.304,0.299	0.183,0.179	0.215,0.195
11	0.305,0.301	0.179,0.180	0.213,0.194
12	0.303,0.298	0.145,0.123	0.156,0.145
13	0.305,0.297	0.142,0.122	0.155,0.143
14	0.305,0.302	0.182,0.182	0.212,0.197
15	0.306,0.301	0.184,0.181	0.215,0.196
16	0.308,0.303	0.149,0.126	0.157,0.146
17	0.310,0.302	0.146,0.124	0.156,0.145
18	0.311,0.307	0.165,0.161	0.201,0.183
19	0.312,0.309	0.167,0.157	0.203,0.181
20	0.310,0.307	0.145,0.124	0.156,0.144
21	0.311,0.308	0.140,0.124	0.157,0.145
22	0.313,0.306	0.143,0.125	0.159,0.146
23	0.312,0.308	0.142,0.123	0.155,0.143
24	0.314,0.309	0.138,0.122	0.153,0.141
Δx	0.023	0.049	0.062
△ y	0.028	0.061	0.057

Comparing Tables 8 to 11 with Tables 4 to 7, the diffusion sheet, the light conversion film, the inverse prism sheet, and the protective sheet were left under high temperature / high humidity conditions, and then the backlight unit according to Examples 1 to 12 and Comparative Example 1 It can be seen that the color coordinates of the same point are changed in each of the backlight units according to FIGS. In particular, in each of the backlight units according to Examples 1 to 12 and the backlight units according to Comparative Examples 1 to 3, points 1 to 4, 5, 8, 9, 12, 13, 16, and 17 which are edges of the display area DS are shown. It can be seen that the change in color coordinates at, 20 and 21 to 24 is large. That is, it can be seen that the edge of the display area DS is damaged by the high temperature / high humidity first, and the inner area of the display area DS is not affected as much as the edge when about 480 hours have elapsed.

Nevertheless, the difference in the initial / final color coordinates of the points 1 to 4 and the points 21 to 24 of the backlight units according to Comparative Examples 2 and 3 compared to the difference of the initial / final color coordinates of the backlight units according to Examples 1 to 12 It can be seen that very large, which can be inferred that the nano light-emitting body applied to the diffusion sheet is damaged by high temperature / high humidity. Since the backlight unit according to Comparative Example 1 is a conventional backlight unit to which no nano light emitter is applied, the diffusion sheet may be partially damaged by high temperature / high humidity, but the difference between the initial and final color coordinates is substantially the same as that of the backlight units according to Examples 1 to 12. It can be seen that the level is similar.

On the other hand, the diffusion sheet, the light conversion film, the inverted prism sheet and the protective sheet were left under high temperature / high humidity conditions, and then Δx and Δy of the backlight units according to Examples 1 to 12 and the backlight units according to Comparative Examples 1 to 3, respectively. It can be seen that also changes. In particular, it can be seen that Δx and Δy of the backlight units according to Comparative Examples 2 and 3 are significantly different from Δx and Δy of the backlight units according to Examples 2 to 12. That is, although the final color coordinates change because the backlight units according to Examples 2 to 12 are placed under high temperature / high humidity conditions, the uniformity of color coordinates is better than that of the backlight units according to Comparative Examples 2 and 3.

The backlight unit according to Example 1 exhibits Δx and Δy at levels similar to those of Comparative Examples 2 and 3 after being subjected to high temperature / humidity conditions, but the difference of the initial / final color coordinates at

points

10, 11, 14 and 15 is shown in Comparative Example 2 And it can be seen that significantly lower than the backlight unit according to 3. That is, since the diffusion sheet applied to the backlight unit according to Example 1 covers the light conversion layer only with the second barrier layer without the second transparent film, the light emitting composite in the light conversion layer is compared with the backlight units according to Examples 2 to 12. Although relatively more damaged, it can be seen that the internal area of the display area DS is not significantly damaged.

As described in Tables 4 to 11, the photoconversion layer is primarily damaged by ultraviolet rays, heat, moisture, etc. by using the photoconversion layer including the fluorescent particles and / or the light emitting complex including the phosphor or the fluorescent complex. By protecting the light conversion layer using the first and second barrier layers, the fluorescent particles and / or the light emitting composite may be secondarily prevented from being damaged by ultraviolet rays, heat, moisture, or the like.

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

A first transparent film;

A first barrier layer formed on one surface of the first transparent film; And

An optical sheet comprising a light conversion layer formed on the first barrier layer, at least one selected from among a light emitting composite and fluorescent particles comprising a wax particle and a nano light emitting body disposed inside the wax particle.
The optical sheet of claim 1, further comprising a second barrier layer disposed on the light conversion layer.
The method of claim 2, wherein the second barrier layer is

An optical sheet comprising a first inorganic film disposed on the light conversion layer.
The method of claim 3, wherein the second barrier layer is

The optical sheet further comprises any one of a second inorganic film disposed on the first inorganic film and an organic film disposed on the first inorganic film.
The method of claim 3, wherein the second barrier layer is

A second inorganic film disposed on the first inorganic film; And

And an organic film disposed between the inorganic film and the second inorganic film.
The method of claim 3, wherein the second barrier layer is

The optical sheet further comprises an organic film disposed between the first inorganic film and the light conversion layer.
The optical sheet according to claim 2, further comprising a second transparent film disposed on the second barrier layer.
The optical sheet of claim 1, further comprising a first optical layer formed on one surface of the first transparent film and having a light diffusion pattern formed on the surface thereof.
The method of claim 8,

A second barrier layer disposed on the light conversion layer;

A second transparent film disposed on the second barrier layer; And

And a second optical layer formed on one surface of the second transparent film and having a light diffusion pattern or a light collecting pattern formed on a surface thereof.
The optical sheet of claim 1, further comprising a first optical layer formed on one surface of the first transparent film and having a light collecting pattern or a first buffer pattern formed on a surface thereof.
The method of claim 10,

A second barrier layer disposed on the light conversion layer;

A second transparent film disposed on the second barrier layer; And

And a second optical layer formed on one surface of the second transparent film and having a light diffusion pattern or a second buffer pattern having a shape different from that of the first buffer pattern.
The method of claim 1, wherein the light emitting composite

The nanosheet is an optical sheet, characterized in that the red light emitting composite which is a red nanoluminescent body.
The method of claim 1, wherein the nano light-emitting body

And a red nano light emitting body and a green nano light emitting body, wherein the light emitting composite is a multicolor light emitting composite wherein the wax particles cover the red and green nano light emitting bodies.
The method of claim 1, wherein the wax particles include first wax particles and second wax particles,

The nanolight emitter comprises at least one red nanolight emitter and at least one green nanolight emitter,

The light emitting composite,

A red light emitting composite including the first wax particles and at least one red nano light emitting body disposed inside the first wax particles; And

An optical sheet comprising a green light emitting composite comprising the second wax particles and at least one green nano light-emitting body disposed inside the second wax particles.
The optical sheet of claim 1, wherein the fluorescent particles comprise green phosphor.
The method of claim 1, wherein the fluorescent particles

Third wax particles; And

An optical sheet comprising a green fluorescent composite comprising at least one green phosphor disposed inside the third wax particles.
The method of claim 1, wherein the light emitting composite

And an outer protective film covering the surface of the wax particles and formed of silicon oxide.
The method of claim 17, wherein the light emitting composite

The optical sheet further comprises a wax layer covering the outer protective layer and formed of a wax-based compound.
The method of claim 1, wherein the light emitting composite

And an inner protective film covering the nano light-emitting body inside the wax particles and formed of silicon oxide.
The method of claim 1, further comprising a second barrier layer disposed on the light conversion layer,

The light conversion layer,

A first light conversion layer formed on the first barrier layer; And

And a second light conversion layer disposed between the second barrier layer and the first light conversion layer.
The method of claim 20, wherein the fluorescent particles are dispersed in the first light conversion layer,

The optical sheet, characterized in that the light emitting composite is dispersed in the second light conversion layer.
The method of claim 21, wherein the fluorescent particles comprise a green phosphor or a green fluorescent complex,

The light emitting composite is an optical sheet, characterized in that the nano light emitting body comprises a red light emitting composite, which is a red nano light emitting body.
The method of claim 20, wherein the wax particles comprise first wax particles and second wax particles,

The nanolight emitter comprises at least one red nanolight emitter and at least one green nanolight emitter,

The light emitting composite,

A red light-emitting composite dispersed in the first light conversion layer and including the first wax particles and the at least one red nano light-emitting body disposed inside the first wax particles; And

And a green light emitting composite dispersed in the second light conversion layer, the green light emitting composite including the second wax particles and the at least one green nano light-emitting body disposed inside the second wax particles.
The method of claim 20, wherein the light conversion layer is

And an adhesive layer interposed between the first light conversion layer and the second light conversion layer and adhering to the first light conversion layer and the second light conversion layer.
The optical sheet according to claim 24, wherein the adhesive layer contains a moisture absorbent.
The method of claim 1, wherein the first barrier layer is

And a first inorganic film formed on the first transparent film.
27. The method of claim 26, wherein the first barrier layer is

The optical sheet further comprises any one of a second inorganic film disposed between the first inorganic film and the light conversion layer, and an organic film disposed between the first inorganic film and the light conversion layer.
27. The method of claim 26, wherein the first barrier layer is

A second inorganic film disposed between the first inorganic film and the light conversion layer; And

And an organic film disposed between the first inorganic film and the second inorganic film.
27. The method of claim 26, wherein the first barrier layer is

And an organic film interposed between the first transparent film and the first inorganic film.
Light emitting element;

A light guide plate receiving light generated by the light emitting device; And

An optical sheet disposed on the light guide plate;

The optical sheet,

A first transparent film;

A first barrier layer formed on one surface of the first transparent film; And

And a light conversion layer formed on the first barrier layer and having at least one selected from a light emitting composite including a wax particle and a nano light emitting body disposed inside the wax particle and fluorescent particles.
The optical sheet of claim 30, wherein the optical sheet is

The backlight unit further comprises a second barrier layer disposed on the light conversion layer.
32. The optical sheet of claim 31, wherein the optical sheet is

And a second transparent film disposed on the second barrier layer.
31. The method of claim 30, wherein the wax particles comprise first wax particles and second wax particles,

The nano light emitting body includes a red nano light emitting body disposed in the first wax particle and a green nano light emitting body disposed in the second wax particle,

The light conversion layer is

A red light emitting composite including the first wax particles and the red nano light emitting body; And

And a green light emitting composite including the second wax particles and the green nano light-emitting body is dispersed.
34. The backlight unit of claim 33, wherein the light emitting element is a blue light emitting element.
The method of claim 30, wherein the light emitting complex comprises a red light emitting complex wherein the nano light emitting body is a red nano light emitting body,

The light emitting device includes a blue light emitting chip and a light conversion layer covering the blue light emitting chip,

The light conversion layer is a backlight unit, characterized in that it comprises a green phosphor or a green fluorescent complex.
The method of claim 30, wherein the light conversion layer comprises both the light emitting composite and the fluorescent particles,

The light emitting device is a backlight unit, characterized in that the blue light emitting device for emitting blue light.
37. The method of claim 36, wherein the light emitting complex comprises a red nano light emitting material or a green nano light emitting material,

The fluorescent particle is a backlight unit, characterized in that it comprises a green phosphor or a green fluorescent complex.
The method of claim 37, wherein the light conversion layer,

A first light conversion layer in which a green light emitting composite including the fluorescent particles or the green nano light emitting body is dispersed; And

And a second photoconversion layer formed on the first photoconversion layer and having a red light emitting composite including the red nanoluminescent body dispersed therein.
The backlight unit of claim 38, wherein the optical sheet is disposed on the light guide plate such that the first light conversion layer faces the light guide plate.
The method of claim 30, wherein the light conversion layer comprises both the light emitting composite and the fluorescent particles,

And the light emitting device is a white light emitting device including a blue light emitting chip and a light conversion layer covering the blue light emitting chip.
41. The method of claim 40, wherein the light emitting complex comprises a red nano light emitting material or a green nano light emitting material,

The fluorescent particle is a backlight unit, characterized in that it comprises a green phosphor or a green fluorescent complex.
The method of claim 41, wherein the light conversion layer,

A first light conversion layer in which a light emitting composite including the fluorescent particles or the green nano light emitting body is dispersed; And

A second photoconversion layer formed on the first photoconversion layer and having a light emitting composite including the red nanoluminescent body dispersed therein;

And the optical sheet is disposed on the light guide plate such that the first light conversion layer faces the light guide plate.
The method of claim 30, further comprising a first light collecting sheet and a second light collecting sheet sequentially disposed on the optical sheet,

And the optical sheet is a diffusion sheet.
31. The device of claim 30, further comprising: a diffusion sheet disposed on the optical sheet;

A first light collecting sheet disposed on the diffusion sheet; And

The backlight unit further comprises a second light collecting sheet disposed on the first light collecting sheet.
The optical sheet of claim 30, wherein the optical sheet is

A first optical layer disposed on one surface of the first transparent film facing the light guide plate;

A second barrier layer disposed on the light conversion layer;

A second transparent film formed on the second barrier layer; And

And a second optical layer disposed on the second transparent film.
46. The backlight unit of claim 45, wherein any one of a light collecting pattern, a light diffusion pattern, and a buffer pattern is formed on each of the first optical layer and the second optical layer.
46. The backlight unit of claim 45, wherein a light collecting pattern is formed on a surface of the first optical layer, and a light diffusion pattern is formed on a surface of the second optical layer.
The method of claim 45, wherein the buffer pattern having a different shape is formed on the surface of each of the first optical layer and the second optical layer,

And a reverse prism sheet including an optical layer disposed on the optical sheet and having a light collecting pattern formed on a surface facing the optical sheet.
46. The backlight unit of claim 45, wherein a light diffusion pattern is formed on surfaces of each of the first optical layer and the second optical layer.