TWI614134B - Optical film, method of manufacturing the same, and backlight unit and display device including the optical film - Google Patents

Abstract

An optical film, a manufacturing method thereof, and a back containing the optical film are disclosed herein. Light unit and display device. The optical film includes: a core layer including a first polymer and a plurality of quantum dots dispersed in the first polymer; and an organic / inorganic barrier layer including at least one inorganic barrier layer and at least one organic barrier layer, And is disposed on the core layer; a polymer layer including a second polymer therein is disposed at least one of the following: between the core layer and the organic / inorganic barrier layer, and the organic / inorganic On the outer surface of the barrier layer.

Description

Optical film, manufacturing method thereof, and backlight unit containing the same And display

The invention discloses an optical film, a manufacturing method thereof, a backlight unit and a display device containing the optical film.

And plasma display panels that use self-luminescence to form images A display panel (PDP) is different from a field emission display (FED). A liquid crystal display (LCD) device forms an image by receiving external light. Therefore, the LCD device requires a backlight unit (BLU) to emit light to the rear surface of the LCD device.

As for the backlight unit of the LCD device, a cold cathode fluorescent lamp (cold cathode fluorescent lamp (CCFL) as the light source. However, it may be difficult to ensure uniform illuminance using CCFL as a light source, and when the LCD device has a large screen, color purity may deteriorate.

Therefore, the use of three-color light emitting diodes has recently been developed. diode (LED) as the backlight unit of the light source. Since a backlight unit using a tri-color LED as a light source produces improved color purity, it is used in, for example, a high-quality display device compared to a backlight unit using a CCFL. However, a backlight unit using a tri-color LED as a light source is more expensive than a backlight unit using a CCFL as a light source. To alleviate this problem, a white light LED that emits light by converting light output from a monochromatic LED chip into white light has been proposed.

Although white light LEDs are not as expensive as tri-color LEDs, they have a lower color purity and color reproducibility than LCD devices that include tri-color LEDs. Therefore, various attempts have been made to develop a backlight unit including a quantum dot capable of maintaining color competitiveness while improving color purity and color reproducibility.

The quantum dots are easily damaged by oxygen and the like, and the optical film containing the quantum dots includes a barrier layer. The barrier layer is manufactured by depositing an inorganic oxide on a substrate or performing a sol-gel process after coating an inorganic oxide precursor to form an inorganic oxide layer. However, the deposition process is time consuming and requires expensive equipment, and is therefore uneconomical, and the sol-gel process requires high temperature curing, and is therefore not suitable for plastic substrates. Therefore, it is necessary to develop an optical film including a barrier layer capable of securing excellent barrier characteristics.

One embodiment provides an optical film having improved moisture and gas barrier properties without reducing optical properties.

Another embodiment provides a method of manufacturing the optical film.

Yet another embodiment provides a backlight unit and a display device including the optical film.

According to one embodiment, an optical film includes a core layer including a first polymer and a plurality of quantum dots dispersed in the first polymer; an organic / inorganic barrier layer including at least one inorganic barrier layer and at least one organic A barrier layer and disposed on the core layer; and a polymer layer including a second polymer, wherein the polymer layer is disposed at at least one of: the core layer and the organic / inorganic barrier Between layers, and on the outer surface of the organic / inorganic barrier layer.

In one embodiment, the at least one inorganic barrier layer is disposed on the core layer, the at least one inorganic barrier layer is disposed on the at least one organic barrier layer; and the polymer including a second polymer Layers are placed on both sides of the core layer.

In one example, the polymer layer including a second polymer is disposed on both sides of the core layer, the at least one inorganic barrier layer is disposed on the polymer layer, and the at least one organic barrier A layer is disposed on the at least one inorganic barrier layer.

In one embodiment, the polymer layer including a second polymer is disposed on both sides of the core layer, the at least one organic barrier layer is disposed on the polymer layer, and the at least one inorganic layer A barrier layer is disposed on the at least one organic barrier layer.

In one embodiment, the first polymer may include a silicone resin, an epoxy resin, a (meth) acrylate resin, polycarbonate, polystyrene, polyolefin, or a combination thereof, and the quantum The dot may be selected from a group II-VI compound, a group III-V compound, a group IV-IV compound, a group IV element, a group IV compound, and combinations thereof.

In one embodiment, the second polymer may be selected from polyester, poly (meth) acrylonitrile, polycarbonate, polyolefin, cyclic olefin polymer (COP), polyimide, And combinations.

In one embodiment, the inorganic barrier layer may include at least one selected from the group consisting of silicon oxide (SiO _x , 0 <x <3), aluminum oxide (Al _x O _y , 0 <x <3, 0). <y <3), tantalum oxide (Ta _x O _y , 0 <x <3, 0 <y <3), and titanium oxide (TiO _x , 0 <x <3), and combinations thereof.

In one embodiment, the organic barrier layer may include at least one selected from the group consisting of (meth) acrylic resin, epoxy resin, urethane resin, thiolene resin, and combinations thereof .

In one embodiment, the optical film may further include a protective layer on an outermost surface of the optical film.

In one embodiment, the protective layer may include a polymer selected from the group consisting of polyester, poly (meth) acrylonitrile, polycarbonate, polyolefin, cycloolefin polymer (COP), polyimide, and Its combination.

In one embodiment, the optical film may have grooves and protrusions on its outermost surface.

Another embodiment provides a method for manufacturing an optical film, the method including: preparing a barrier film by depositing an inorganic oxide on a polymer layer including a second polymer to form an inorganic barrier layer, And then coating the inorganic barrier layer with an organic barrier layer composition containing a curable monomer, an initiator and a solvent, and then curing the organic barrier layer composition to form an organic barrier layer, or An organic barrier layer composition including a curable monomer, an initiator, and a solvent is coated on the polymer layer of the material, and then the organic barrier layer composition is cured to form an organic barrier layer, and then on the organic barrier layer Depositing an inorganic oxide to form an inorganic barrier layer; and transferring the polymer layer, the organic barrier layer, or the inorganic barrier layer at the outermost surface of the barrier film to both sides of the core layer, the The core layer includes a plurality of quantum dots dispersed in the first polymer.

In one embodiment, the method of manufacturing an optical film may further include forming a protective layer at an outermost surface of the optical film.

In one embodiment, the first polymer, the second polymer, the inorganic barrier layer, and the protective layer are the same as those described above.

In one embodiment, the curable monomer may be a monomer that provides a (meth) acrylic resin, an epoxy resin, a urethane resin, or a thiolene resin or a combination thereof after curing.

In one embodiment, the curing may be performed by ultraviolet (UV) light curing or thermal curing.

Another embodiment provides a backlight unit including the optical film.

Yet another embodiment provides a display device including the backlight unit.

Other embodiments will be described in the detailed description.

The optical film with excellent moisture and gas barrier properties can be provided by forming a polymer layer, an inorganic barrier layer, and an organic barrier layer on a core layer including a quantum dot as a multilayer to compensate for the defects of the inorganic barrier layer and provide compactness Bund layer.

10A, 10B, 20, 30, 40‧‧‧ optical film

12‧‧‧ core layer

14a, 14b‧‧‧Polymer layer

16a, 16b‧‧‧‧Inorganic barrier layer

18a, 18b‧‧‧ organic barrier layer

22a, 22b‧‧‧protective layer

100‧‧‧LCD display device

101‧‧‧ backlight unit

110‧‧‧light source

120‧‧‧light guide

500‧‧‧LCD panel

501‧‧‧first polarizer

502‧‧‧LCD layer

503‧‧‧second polarizer

504‧‧‧ color filter

FIG. 1 is a schematic cross-sectional view illustrating an optical film according to an embodiment.

FIG. 2 is a schematic sectional view showing an optical film according to another embodiment.

FIG. 3 is a schematic cross-sectional view illustrating an optical film according to another embodiment.

FIG. 4 is a schematic cross-sectional view illustrating an optical film according to another embodiment.

FIG. 5 is a schematic sectional view showing an optical film according to another embodiment.

FIG. 6 is a schematic diagram showing a liquid crystal display device including an optical film according to an embodiment.

Hereinafter, the present invention will be explained more fully in the following detailed description of the present invention, which describes some embodiments of the present invention instead of all the embodiments. The invention may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments described herein.

For the sake of clarity, parts that are not relevant to this description are not repeated, and the same or similar constituent elements are indicated by the same reference numerals throughout the specification.

In the drawings, the thicknesses of layers, films, panels, regions, etc. have been exaggerated for clarity. Throughout this specification, the same reference numbers refer to the same elements.

It will be understood that when an element (eg, layer, film, region, or substrate) is referred to as being “on” another element, it can be directly on the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present.

When a specific definition is not otherwise provided, "a combination thereof" as used herein refers to a mixture, a copolymer, or a laminate.

When a specific definition is not otherwise provided, (meth) acrylate resin as used herein refers to acrylate resin or methacrylate resin, and poly (meth) acrylonitrile refers to Polyacrylonitrile or polymethacrylonitrile is substituted, and (meth) acrylic resin refers to acrylic resin or methacrylic resin.

According to an embodiment, an optical film includes: a core layer including a first polymer and a plurality of quantum dots dispersed in the first polymer; and an organic / inorganic barrier layer including at least one inorganic barrier layer and at least one An organic barrier layer and disposed on the core layer, wherein the polymer layer containing the second polymer is disposed at least one of: between the core layer and the organic / inorganic barrier layer, and outside the organic / inorganic barrier layer On the surface.

The core layer may be positioned to contact at least one of an organic barrier layer or an inorganic barrier layer or a polymer layer of the organic / inorganic barrier layer. In one embodiment, the core layer may contact the organic barrier layer, and in another embodiment, the core layer may contact the polymer layer. The organic / inorganic barrier layer is composed of at least one inorganic barrier layer and at least one organic barrier layer stacked on the core layer, or at least one organic barrier layer and at least one inorganic barrier layer stacked on the core layer. In addition, the inorganic barrier layer and the organic barrier layer may be alternately stacked.

Hereinafter, an optical film according to an embodiment is explained with reference to the drawings.

FIG. 1 is a schematic cross-sectional view showing an optical film according to one embodiment, and FIG. 2 is a schematic cross-sectional view of an optical film according to another embodiment. Fig. 1 shows the optics in which a polymer layer containing a second polymer is located on the outer surface of an organic / inorganic barrier layer Film, and FIG. 2 shows an optical film in which a polymer layer containing a second polymer is located between a core layer and an organic / inorganic barrier layer.

Referring to FIG. 1, an optical film 10A according to an embodiment includes: a core layer 12 including a first polymer and a plurality of quantum dots dispersed in the first polymer; and inorganic barrier layers 16 a and 16 b located at the core layer 12. Organic barrier layers 18a and 18b are located on inorganic barrier layers 16a and 16b; and polymer layers 14a and 14b include a second polymer and are positioned on both sides of organic barrier layers 18a and 18b.

Referring to FIG. 2, an optical film 10B according to an embodiment includes: a core layer 12 including a first polymer and a plurality of quantum dots dispersed in the first polymer; and polymer layers 14 a and 14 b including a second polymer It is located on both sides of the core layer 12; inorganic barrier layers 16a and 16b are located on the polymer layers 14a and 14b; and organic barrier layers 18a and 18b are located on the inorganic barrier layers 16a and 16b.

The core layer 12 includes a plurality of quantum dots dispersed in a first polymer. The first polymer may be selected from the group consisting of: silicone resin; epoxy resin; (meth) acrylate resin; polycarbonate; polystyrene; polyolefin, such as polyethylene, polypropylene, or polyisobutylene; and combinations thereof .

The quantum dot may be selected from a group II-VI compound, a group III-V compound, a group IV-IV compound, a group IV element, a group IV compound, and a combination thereof, wherein the term "family" refers to a family of the periodic table of elements. Group II-VI compounds include: binary compounds selected from CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS and combinations thereof; ternary compounds selected from CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, ZnSe , MgZnS, and combinations thereof; and quaternary compounds selected from HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe, and combinations thereof. Group III-V compounds include: binary compounds selected from GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, and combinations thereof; ternary compounds selected from GaNP, GaAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP, and combinations thereof; and quaternary compounds selected from GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, and combinations thereof. Group IV-VI compounds include: binary compounds selected from SnS, SnSe, SnTe, PbS, PbSe, PbTe, and combinations thereof; ternary compounds selected from SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe and combinations thereof; and quaternary element compounds selected from SnPbSSe, SnPbSeTe, SnPbSTe, and combinations thereof. Group IV elements may be selected from Si, Ge, and mixtures thereof. Group IV compounds include: binary compounds selected from SiC, SiGe, and mixtures thereof.

Here, the element, binary compound, ternary compound or quaternary compound may exist in the form of particles having a substantially uniform concentration, or in the form of particles having different concentration distributions in the same particle. In addition, each particle may have a core / shell structure in which the second quantum dot surrounds the first quantum dot. The core and shell may have an interface that may have a reduced elemental concentration gradient in a direction from the surface of the particle to its center.

Full width at half of a quantum dot in the emission wavelength spectrum Maximum, FWHM) may be less than or equal to about 45 nm, specifically, less than or equal to about 40 nm, and more specifically, less than or equal to about 30 nm. Within this range, the color purity or color reproducibility of the optical films 10A and 10B can be improved.

The core layer 12 may be formed as two or more layers. For example, the core layer 12 may include a first layer including a red quantum dot and a second layer including a green quantum dot.

The quantum dots may be contained in the core layer 12 in an amount of about 1 wt% to about 20 wt% based on the total weight of the core layer 12.

The thickness of the core layer 12 may be less than or equal to about 500 μm, less than or equal to about 350 μm, less than or equal to about 250 μm, or about 50 μm to about 200 μm. Within this range, the optical properties of the optical films 10A and 10B can be easily controlled.

Inorganic barrier layers 16 a and 16 b exist on both sides of the core layer 12. The inorganic barrier layers 16a and 16b may include silicon oxide (SiO _x , 0 <x <3), aluminum oxide (Al _x O _y , 0 <x <3, 0 <y <3), tantalum oxide (Ta _x O _y , 0 <x <3,0 <y < 3), titanium oxide _{(TiO x, 0 <x <} 3) , and combinations thereof.

The thickness of the inorganic barrier layers 16a and 16b may be less than or equal to about 1 μm, less than or equal to about 500 nm, or about 10 nm to about 200 nm. Within this range, barrier properties can be improved while ensuring the optical properties of the optical films 10A and 10B. The inorganic barrier layers 16a and 16b may include two or more layers containing different inorganic oxides from each other.

The organic barrier layers 18a and 18b may include a resin selected from a (meth) acrylic resin, an epoxy resin, a urethane resin, a thiolene resin, and combinations thereof.

The thickness of the organic barrier layers 18a and 18b may be less than or equal to about 100 μm, less than or equal to about 50 μm, or about 1 μm to about 100 μm. Within this range, barrier properties can be improved while ensuring the optical properties of the optical films 10A and 10B. The organic barrier layers 18a and 18b may include two or more layers including resins different from each other.

The organic barrier layers 18a and 18b can make up for the defects of the inorganic barrier layers 16a and 16b to provide a dense layer.

Polymer layers 14a and 14b including the second polymer may be present on the organic barrier layers 18a and 18b. The second polymer may be selected from the group consisting of polyester, poly (meth) acrylonitrile, polycarbonate, polyolefin, cycloolefin polymer (COP), polyimide, and combinations thereof.

The polyester may be selected from the group consisting of polyethylene terephthalate terepbthalate (PET), polybutylene terephthalate, polyethylene naphthalate, polyvinyl acetate, and combinations thereof.

The polyolefin may include polyethylene, polypropylene, and polystyrene. The cycloolefin polymer may be prepared by reacting a cyclodiene compound (for example, cyclopentene, norbornene, or dicyclopentadiene) with a linear olefin compound (for example, ethylene, propylene, or butene) to prepare a cycloolefin. A polymer obtained by polymerizing the monomer and the cycloolefin monomer.

The thickness of the polymer layers 14a and 14b may be less than or equal to about 100 μm, less than or equal to about 50 μm, or about 1 μm to about 100 μm. Within this range, barrier properties can be improved while ensuring the optical properties of the optical films 10A and 10B.

As shown in FIG. 2, the polymer layers 14 a and 14 b may be located between the core layer 12 and the inorganic barrier layers 16 a and 16 b.

The optical films 10A and 10B may have grooves and protrusions on their outermost surfaces. In other words, the polymer layers 14a and 14b in FIG. 1 may have grooves and protrusions on a side that does not contact the organic barrier layers 18a and 18b, and the organic barrier layers 18a and 18b in FIG. 2 do not contact the inorganic barrier layers 16a And 16b may have grooves and protrusions on one side. The polymer layers 14a and 14b or the organic barrier layers 18a and 18b having grooves and protrusions on the surface can play a role in diffusing light emitted from the LED light source.

FIG. 3 is a schematic sectional view showing an optical film 20 according to another embodiment. The optical film 20 may further include protective layers 22 a and 22 b on the organic barrier layers 18 a and 18 b of the optical film 10B in FIG. 2. Similarly, the protective layers 22 a and 22 b may be additionally located on the polymer layers 14 a and 14 b of the optical film 10A in FIG. 1. Herein, the protective layers 22a and 22b may include a polymer different from the polymers included in the polymer layers 14a and 14b.

The protective layers 22a and 22b may include a polymer selected from the group consisting of polyester, poly (meth) acrylonitrile, polycarbonate, polyolefin, cycloolefin polymer (COP), polyimide, and combinations thereof.

The polyester may be selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyvinyl acetate, and combinations thereof.

The polyolefin may be selected from the group consisting of polyethylene, polypropylene, and polystyrene. The cycloolefin polymer may be prepared by reacting a cyclodiene compound (for example, cyclopentene, norbornene, or dicyclopentadiene) with a linear olefin compound (for example, ethylene, propylene, or butene) to prepare a cycloolefin. A polymer obtained by polymerizing the monomer and the cycloolefin monomer.

The thickness of the protective layers 22a and 22b may be less than or equal to about 50 μm, less than or equal to about 40 μm, or about 10 μm to about 40 μm. Within this range, barrier properties can be improved while ensuring the optical properties of the optical films 10A and 10B.

The protective layers 22a and 22b may have grooves and protrusions on a side that does not contact the organic barrier layers 18a and 18b. The protective layers 22a and 22b with grooves and protrusions on the surface can play a role in diffusing light emitted from the LED light source.

FIG. 4 is a schematic sectional view showing an optical film 30 according to another embodiment.

Referring to FIG. 4, an optical film 30 according to an embodiment includes: a core layer 12 including a first polymer and a plurality of quantum dots dispersed in the first polymer; a polymer layer 14 a including a second polymer; and 14b is located on both sides of the core layer 12; organic barrier layers 18a and 18b are located on the polymer layers 14a and 14b; and inorganic barrier layers 16a and 16b are located on the organic barrier layers 18a and 18b.

FIG. 4 shows an optical film in which the polymer layers 14a and 14b are located between the core layer 12 and the organic barrier layers 18a and 18b, but the polymer layers 14a and 14b may be located on the inorganic barrier layers 16a and 16b.

The core layer 12, the polymer layers 14a and 14b, the organic barrier layers 18a and 18b, and the inorganic barrier layers 16a and 16b are the same as those described above.

The inorganic barrier layers 16a and 16b may have grooves and protrusions on a side that does not contact the organic barrier layers 18a and 18b. The inorganic barrier layers 16a and 16b having grooves and protrusions on the surface can play a role of diffusing light emitted from the LED light source.

FIG. 5 is a schematic sectional view showing an optical film 40 according to another embodiment. The optical film 40 may further include protective layers 22a and 22b on the inorganic barrier layers 16a and 16b. Herein, the protective layers 22 a and 22 b are the same as those shown in FIG. 3.

The protective layers 22a and 22b may have grooves and protrusions on a side that does not contact the inorganic barrier layers 16a and 16b. The protective layers 22a and 22b with grooves and protrusions on the surface can play a role in diffusing light emitted from the LED light source.

Hereinafter, a method of manufacturing the optical films 10A, 10B, 20, 30, and 40 is explained.

The optical films 10A, 10B, and 30 are manufactured by preparing a barrier film by depositing an inorganic oxide on the polymer layers 14a and 14b containing a second polymer to form the inorganic barrier layers 16a and 16b. And then coating the inorganic barrier layer 16a and 16b with an organic barrier layer composition containing a curable monomer, an initiator and a solvent, and then curing the organic barrier layer composition to form the organic barrier layers 18a and 18b, or An organic barrier layer composition including a curable monomer, an initiator, and a solvent is coated on the polymer layers 14a and 14b including the second polymer, and then the organic barrier layer composition is cured to form the organic barrier layer 18a and 18b, and then depositing an inorganic oxide on the organic barrier layer to form inorganic barrier layers 16a and 16b; and polymer layers 14a and 14b, organic barrier layers 18a and 18b at the outermost surface of the barrier film, Or the inorganic barrier layers 16a and 16b are transferred to both sides of the core layer 12, and the core layer 12 includes a plurality of quantum dots dispersed in the first polymer.

The curable monomer may be a photocurable monomer that provides: (meth) acrylic resin (acrylic resin or methacrylic resin), epoxy resin, urethane resin, thiolene resin, or Its combination.

For example, the monomer providing the (meth) acrylic resin may be: a monofunctional photocurable monomer selected from the group consisting of isobornyl (meth) acrylate, isooctyl (meth) acrylate, (meth) ) Lauryl acrylate, benzoyl (meth) acrylate, norbornyl (meth) acrylate, cyclohexyl (meth) acrylate, n-hexyl (meth) acrylate, adamantyl acrylate, Cyclopentyl acrylate and combinations thereof; multifunctional photocurable monomers selected from the group consisting of difunctional (meth) acrylates, tris (meth) acrylates, ethoxy addition pentaerythritol tetra (meth) acrylates, And dipentaerythritol hexa (meth) acrylate (DPHA), and the like, the bifunctional (meth) acrylate is selected from the group consisting of hexanediol di (meth) acrylate, di (meth) Tricyclodecane dimethanol acrylate, 1,10-decanediol di (meth) acrylate, butanediol di (meth) acrylate, neophenyldiol di (meth) acrylate, bis (meth) acrylate Neopentyl glycol methacrylate, nonyl propylene glycol di (meth) acrylate, dipropylene glycol di (meth) acrylate, di (meth) propylene Diethylene glycol enoate, ethylene glycol di (meth) acrylate, tetra-triethylene glycol di (meth) acrylate, ethoxylated bisphenol A di (meth) acrylate, and Triethylene glycol (meth) acrylate and the like, the tri (meth) acrylate is selected from the group consisting of trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, ethoxylated tris Methylol (meth) propane tri (meth) acrylate, ethylene oxide addition trimethylolpropane Tri (meth) acrylate (ethylene oxide addition trimethylolpropane tri (meth) acrylate, EO-TMPTA), glycerine propylene oxide addition tri (meth) acrylate (PETTA).

The monomers may be used alone or as a mixture of two or more monomers.

A thiol ene resin can be prepared using a monomer including at least one thiol group at the terminal and a monomer including at least one carbon-carbon unsaturated bond at the terminal.

Examples of the monomer including at least one thiol group at the terminal may be pentaerythritol tetra (3-mercaptoacetate) ester, trimethylolpropane tri (3-mercaptopropionate) ester, pentaerythritol tetra (3-mercaptopropionate) Esters and dipentaerythritol hexa (3-mercaptopropionic acid) esters.

Examples of the monomer containing at least one carbon-carbon unsaturated bond at the terminal may be 2,4,6-triallyloxy-1,3,5-triazine, pentaerythritol allyl ether, and 1,3,5 -Triallyl-1,3,5-triazine-2,4,6 trione and the like. Alternatively, a monomer that provides a (meth) acrylic resin may be used.

The initiator may be a photo-curable initiator or a heat-curable initiator. Specific examples may be at least one compound selected from, but not limited to, 1-hydroxycyclohexylphenylmethanone, 2-methyl-1 (4- (methylthio) phenyl) -2-? Phenyl-1-acetone, hydroxy ketone, benzophenone, benzyl dimethyl ketone, 2-hydroxy-2-methyl-1-phenyl-propan-1-one, difluorenylphosphine oxide , Diphenyl (2,4,6-trimethylbenzyl Fluorenyl) -phosphine oxide and phenylbis (2,3,6-trimethylbenzylfluorenyl) phosphine oxide. The initiator may be used in an amount of about 0.1 parts by weight to about 5 parts by weight based on 100 parts by weight of the monomer.

The solvent may include 2-methoxyethanol, isopropanol, N, N-dimethylacetamide (DMAc), N-methyl-2-pyrrolidone (NMP), tetrahydrofuran (tetrahydrofuran, THF), N, N-dimethylformamide (DMF), toluene, xylene, methyl ethyl ketone, or a combination thereof, but is not limited thereto.

If necessary, the organic barrier layer composition may further include a leveling improvement additive.

The organic barrier layer composition may be coated on the substrate by a method such as spin coating, screen printing, gravure printing, and dye coating.

The curing may be ultraviolet (UV) curing or thermal curing.

The optical films 10A, 10B, and 30 may further include protective layers 22a and 22b on their outermost surfaces.

The first polymer, the second polymer, the inorganic barrier layer, and the protective layer are the same as those described in the above optical films 10A, 10B, 20, 30, and 40.

The optical films 10A, 10B, 20, 30, and 40 can be used for a backlight unit (BLU) of a liquid crystal display device.

Hereinafter, a liquid crystal display device including the optical films 10A, 10B, 20, 30, and 40 will be described with reference to FIG. 6. FIG. 6 is a schematic diagram illustrating a liquid crystal display device including an optical film according to an embodiment.

Referring to FIG. 6, the liquid crystal display device 100 includes a backlight unit 101 and a liquid crystal panel 500 using white light provided from the backlight unit 101 to achieve a predetermined color image.

The backlight unit 101 includes: a light emitting diode (LED) light source 110; optical films 10A, 10B, 20, 30, and 40 for converting light emitted from the LED light source 110 into white light; and a light guide 120 disposed on the LED light source 110 And the optical films 10A, 10B, 20, 30, and 40 to guide the light emitted from the LED light source 110 toward the optical films 10A, 10B, 20, 30, and 40. The LED light source 110 includes a plurality of LED chips and emits light having a predetermined wavelength. The LED light source 110 may be a blue light emitting LED light source or an ultraviolet (UV) light emitting LED light source. In FIG. 3, the light source 110 is located on the side, but may also be located below the optical films 10A, 10B, 20, 30, and 40.

A reflector (not shown in the figure) may be further positioned on the lower side of the light guide 120.

The optical films 10A, 10B, 20, 30, and 40 are disposed to be separated from the LED light source 110 and serve as a light conversion layer to convert light emitted from the LED light source 110 into white light, and thus provide white light to the liquid crystal panel 500.

Although not shown in FIG. 6, it is selected from a diffusion plate, a prism sheet, a microlens sheet, and an illumination improving film (for example, a double brightness enhancement film (double brightness enhancement film) At least one of the enhancement films (DBEF)) may be further disposed on the optical films 10A, 10B, 20, 30, and 40.

In addition, the optical films 10A, 10B, 20, 30, and 40 may be disposed between at least two films selected from the group consisting of a light guide, a diffusion plate, a prism sheet, a microlens sheet, and an illumination improving film (for example, dual brightness enhancement Membrane (DBEF)).

The optical films 10A, 10B, 20, 30, and 40 and the above-mentioned films may be in contact with each other or separated from each other.

The white light emitted from the backlight unit 101 is incident toward the liquid crystal panel 500. The liquid crystal panel 500 uses white light incident from the backlight unit 101 to achieve a predetermined color image. The liquid crystal panel 500 may have a structure in which a first polarizer 501, a liquid crystal layer 502, a second polarizer 503, and a color filter 504 are sequentially disposed. The white light emitted from the backlight unit 101 is transmitted through the first polarizer 501, the liquid crystal layer 502, and the second polarizer 503, and then transmitted into the color filter 504 to develop a predetermined color image.

Hereinafter, the embodiments will be described in more detail with reference to examples. However, these examples should in no way be interpreted as limiting the scope of the invention.

Manufacturing of barrier films Preparation Example 1

A high frequency heating method was used to deposit silicon oxide (SiO) on a 75 μm-thick polyethylene terephthalate (PET) film (T910-E, Mitsubishi Inc.) to An approximately 30 nm thick SiO _x (0 <x <3) deposition layer was formed as an inorganic barrier layer.

On the other hand, 50 g of pentaerythritol tetrakis (3-mercaptoacetate) ester (4T, Bruno Bock Thiochemicals) and 500 ppm of hydroquinone were added at 500 revolutions per minute (rpm). Methyl ether (MEHQ, Aldrich Co.) was stirred for 30 minutes, and 50 g of TOT (2,4,6-triallyloxy-1,3,5 triazine) and 0.5 g of BASF were added thereto. (BASF Co.) manufactured Irgacure 754 and 0.5 g of TPO-L manufactured by BASF, and the mixture was stirred at 500 rpm for 30 minutes to prepare an organic barrier layer composition.

Coating the organic barrier layer composition with a Meyor bar to form a 20 μm thick organic barrier layer on an inorganic barrier layer, and performing ultraviolet (UV) curing at 1500 mJ / cm ² using a metal halide lamp, To make a barrier film.

Preparation Example 2

A high-frequency heating method was used to deposit silicon oxide (SiO) on a 75 μm-thick polyethylene terephthalate (PET) film (T910-E, Mitsubishi Corporation) to form a 30-nm-thick SiO _x (0 <x <3) The deposited layer serves as an inorganic barrier layer.

On the other hand, 50 g of 4T (pentaerythritol tetrakis (3-mercaptoacetate)) manufactured by Bruno Bock Sulfur Chemicals and 500 ppm of MEHQ (hydroquinone monomethyl ether) manufactured by Aldrich were stirred at 500 rpm for 30 minutes. , Add it 50 g of TOT (2,4,6-triallyloxy-1,3,5 triazine), 0.5 g of Yanjiagu 754 manufactured by BASF, and 0.5 g of TPO-L manufactured by BASF. The mixture was agitated for 30 minutes to prepare an organic barrier layer composition.

On the inorganic barrier layer, the organic barrier layer composition was coated with a Meyer bar, and after being covered with a 50 μm-thick polyethylene terephthalate (PET) film (T910-E50, Mitsubishi Corporation) Then, a metal halide lamp was subjected to ultraviolet (UV) curing at 1500 mJ / cm ² to form a 20 μm-thick organic barrier layer to manufacture a barrier film.

Preparation Example 3

A barrier film was manufactured according to the same method as in Preparation Example 1 except that the organic barrier layer composition was prepared as follows: 50 g of 4T (pentaerythritol tetrakis (3-mercaptoacetate)) manufactured by Bruno Bock Sulfur Chemical Co., Ltd. was subjected to 500 rpm ) And 500 ppm of MEHQ manufactured by Aldridge Corporation for 30 minutes. At 500 rpm, 40 g of HBSQ2052 manufactured by Arakawa Chemical Co., Ltd. (Arakawa) as a polyfunctional arylate was mixed with 0.5 g of Yanjiagu 754 manufactured by BASF and 0.5 g of TPO-L for 30 minutes to prepare an organic barrier layer组合 物。 Composition.

Preparation Example 4

A barrier film was manufactured according to the same method as in Preparation Example 1 except that the organic barrier layer composition was prepared as follows: 50 g of 4T (pentaerythritol tetrakis (3-mercaptoacetate)) manufactured by Bruno Bock Sulfur Chemical Co., Ltd. was charged at 500 rpm. ) And 500 The MEHQ manufactured by ppm Aldridge was stirred for 30 minutes. Next, 10 g of pentaerythritol triacrylate (PETA) (M340, Miwon Commercial Co., Ltd., Korea), 0.5 g of Yanjiagu 754 manufactured by BASF, and 0.5 g of TPO- L was mixed for 30 minutes to prepare an organic barrier layer composition.

Preparation Example 5

A barrier film was manufactured according to the same method as in Preparation Example 1 except that the organic barrier layer composition was prepared as follows: 500 mJ / cm ^{2 of} an ultraviolet (UV) light dose was used, and 3 g of Ciba Specialty Yanjiagu 184 manufactured by Chemical Inc.) was mixed as a polymerization initiator with 25.0 g of 2-methoxyethanol (MCS) as a solvent. Next, 10 g of dipentaerythritolhexaacrylate (DPHA) (NOPCOMER 4612, Sanopco Co., Ltd.), 10 g of pentaerythritoltriacrylate (PETA) (M340, Korea Mimoto Corporation), 11g A-TMPT-3EO (that is, ethoxylated trimethylolpropanetriacrylate (TMPT3EOA)) was added as a polyfunctional acrylate monomer, and 39.8 g of isopropyl alcohol (IPA) was added as a solvent To a mixed solution and stir the mixture. Finally, 0.2 g of polyether-modified polydimethylsiloxane (BYK 306, BYK Chemie Inc.) was added as a leveling improvement additive to prepare a barrier layer composition.

Preparation Example 6

A barrier film was manufactured according to the same method as in Preparation Example 1 except that the organic barrier layer composition was prepared as follows: 500 mJ / cm ^{2 of} an ultraviolet (UV) light dose was used, and 3 parts by weight of Ciba Refinery Co., Ltd. was used. The manufactured Yanjiagu 184 was mixed as a polymerization initiator with 30.0 parts by weight of 2-methoxyethanol (MCS) as a solvent. Next, 5.0 parts by weight of dipentaerythritolhexaacrylate (DPHA) (NOPCOMER 4612, Sinopec Co., Ltd.) and 15.0 parts by weight of pentaerythritol triacrylate (PETA) (M340, Korea Miwon Corporation) And 20.0 parts by weight of A-TMPT-3EO as a polyfunctional acrylic monomer is added to the mixed solution, and the mixture is stirred, and then 26.8 parts by weight of isopropyl alcohol (IPA) is added as a solvent, and The obtained mixture was stirred. Finally, 0.2 parts by weight of polyether-modified polydimethylsiloxane (BYK 306, BYK, Germany) was added as a leveling improvement additive to obtain an ultraviolet (UV) curable organic barrier layer composition Thing.

Preparation Example 7

A barrier film was manufactured according to the same method as in Preparation Example 1 except that the organic barrier layer composition was prepared in the following manner: an ultraviolet (UV) light dose of 500 mJ / cm ² was used, and 3 parts by weight of (ciba refined Yanjiagu 184 manufactured by the company) was used as a polymerization initiator and 20.0 parts by weight of 2-methoxyethanol (MCS) as a solvent was mixed. Next, 5.0 parts by weight of dipentaerythritol hexaacrylate (DPHA) (NOPCOMER 4612, Synopsys Co., Ltd.), 15.0 parts by weight of pentaerythritol triacrylate (PETA) (M340, Korea Mimoto Corporation), and 40.0 parts by weight of A-TMPT-3EO was added to the mixed solution as a polyfunctional acrylic monomer, and the mixture was stirred, and then 16.8 parts by weight of isopropyl alcohol (IPA) was added thereto as a solvent, and the obtained mixture was stirred . Finally, 0.2 parts by weight of polyether-modified polydimethylsiloxane (BYK 306, BYK, Germany) was added as a leveling improvement additive to prepare an organic barrier layer composition.

Preparation Example 8

A barrier film was manufactured according to the same method as in Preparation Example 1 except that the organic barrier layer composition was prepared in the following manner: an ultraviolet (UV) light dose of 500 mJ / cm ² was used, and 0.6 parts by weight of an aromatic samarium antimony salt was used. (Sanshin Chemical Inc.) was used as a cationic initiator and 20.0 parts by weight of 2-methoxyethanol (MCS) as a solvent was mixed. Next, 40.0 parts by weight of a cycloaliphatic epoxy resin (CELLOXIDE 2021P, Daicel Co.) was added to the mixed solution, and it was stirred, and then 39.2 parts by weight of isopropyl alcohol (IPA ) As a solvent and agitate it. Finally, 0.2 parts by weight of polyether-modified polydimethylsiloxane (BYK 306, BYK, Germany) was added as a leveling improvement additive to prepare a barrier layer composition.

Preparation Example 9

A silicon oxide (SiO) was deposited by a high-frequency heating method to form an approximately 30 nm-thick SiO _x on a 75 μm-thick polyethylene terephthalate (PET) film (T910-E, Mitsubishi Corporation) (0 < x <3) The deposited layer is used as an inorganic barrier layer to make a barrier film.

Preparation Example 10

SiO _x (0 <x <3) was deposited by a high-frequency heating method to form an approximately 100 nm-thick inorganic film on a 75 μm-thick polyethylene terephthalate (PET) film (T910-E, Mitsubishi Corporation). Barrier layer to make a barrier film.

Example 1

An optical film was manufactured by injecting a content sub-dot coating solution (Nanodot 520, Ecoflux) having an InP / ZnS core / shell structure into the organic barrier of the barrier film according to Preparation Example 1 Layer to form a sub-dot coating layer with a content of 100 μm; cover the other side of the coating layer that does not contact the organic barrier layer with the organic barrier layer of the barrier film according to Preparation Example 1; and adjust the partition wall to use The metal halide lamp cures the content sub-dot coating layer with ultraviolet (UV) light of 700 mJ / cm ² .

Example 2

An optical film was manufactured by injecting a content sub-dot coating solution (Nanodot 520, Egoflex Co., Ltd.) having an InP / ZnS core / shell structure into the PET layer of the barrier film according to Preparation Example 1 to Forming a 100 μm thick sub-dot coating layer; covering the non-contacting PET side of the coating layer with the PET layer of the barrier film according to Preparation Example 1; and adjusting the partition wall to use a metal halide lamp at 700 mJ / cm ² of ultraviolet (UV) light to cure the content sub-dot coating layer.

Example 3

An optical film was manufactured by injecting a content dot coating solution (Nanodot 520, Egoflex Co., Ltd.) having an InP / ZnS core / shell structure into a 75 μm-thick PET layer of the barrier film according to Preparation Example 2 In order to form a 100 μm thick sub-dot coating layer; cover the other side of the coating layer that is not in contact with the PET layer with a 50 μm thick PET layer of the barrier film according to Example 2; and adjust the partition wall to use The metal halide lamp cures the content sub-dot coating layer with ultraviolet (UV) light of 700 mJ / cm ² .

Example 4

An optical film was manufactured by injecting a content sub-dot coating solution (Nanodot 520, Egoflex Co., Ltd.) having an InP / ZnS core / shell structure to a 50 μm-thick PET film of the barrier film according to Preparation Example 2 A 100 μm thick sub-dot coating layer was formed on the layer; the other side of the coating layer that was not in contact with the PET layer was covered with a 50 μm thick PET layer of the barrier film according to Preparation Example 2; and the partition wall was adjusted to use metal halide The object lamp cures the content sub-dot coating layer with 700 mJ / cm ² of ultraviolet (UV) light.

Example 5

An optical film was manufactured according to the same method as in Example 1 except that the barrier film according to Preparation Example 3 was used instead of the barrier film according to Preparation Example 1.

Example 6

An optical film was manufactured according to the same method as in Example 1 except that the barrier film according to Preparation Example 4 was used instead of the barrier film according to Preparation Example 1.

Example 7

An optical film was manufactured according to the same method as in Example 1 except that the barrier film according to Preparation Example 5 was used instead of the barrier film according to Preparation Example 1.

Example 8

An optical film was manufactured according to the same method as in Example 1 except that the barrier film according to Preparation Example 6 was used instead of using the barrier film according to Preparation Example 1.

Example 9

An optical film was manufactured according to the same method as in Example 1 except that the barrier film according to Preparation Example 7 was used instead of using the barrier film according to Preparation Example 1.

Example 10

An optical film was manufactured according to the same method as in Example 1 except that the barrier film according to Preparation Example 8 was used instead of the barrier film according to Preparation Example 1.

Comparative Example 1

An optical film was manufactured according to the same method as in Example 1 except that the barrier film according to Preparation Example 9 was used instead of using the barrier film according to Preparation Example 1.

Comparative Example 2

An optical film was manufactured according to the same method as in Example 1 except that the barrier film according to Preparation Example 10 was used instead of using the barrier film according to Preparation Example 1.

Evaluation of high temperature storage

The optical films (sample size: 100 mm × 100 mm) according to Examples 1 to 10 and Comparative Examples 1 and 2 were stored at 60 ° C for 500 hours, the blue LED was turned on, and stored at 60 ° C, and then used Spectroradiometer (CS2000, Konica Minnolta Inc.) was measured against the degree. When the illuminance before high temperature storage is regarded as 100%, the relative degree after high temperature storage is provided in Table 1.

Moisture Vapor Transmittance Rate ( WVTR )

The water vapor transmission rate of the barrier film (sample size: 100 mm × 100 mm) according to Preparation Example 1 to Preparation Example 10 was measured using Aquatran Model 1 (Mocon Inc.) according to ASTM F-1249. . The results are provided in Table 1.

Oxygen Transmittance Rate ( OTR )

The oxygen transmission rate of the barrier films (sample size: 100 mm × 100 mm) according to Preparation Example 1 to Preparation Example 10 was measured using OX-tran 2/21 (American Mocom Inc.) according to ASTM D-3985. The results are provided in Table 1.

Referring to Table 1, the optical films according to Examples 1 to 10 did not exhibit degradation of quantum dot characteristics when stored at high temperatures, and exhibited excellent moisture and oxygen barrier properties and excellent film characteristics.

Although the invention has been described in connection with exemplary embodiments that are presently considered feasible, it should be understood that the invention is not limited to the disclosed embodiments, but rather, is intended to cover the spirit and Various retouching and equivalent configurations within the range. Therefore, the above-mentioned embodiments should be understood as exemplary, rather than limiting the present invention in any way.

10B‧‧‧ Optical Film

12‧‧‧ core layer

14a, 14b‧‧‧Polymer layer

16a, 16b‧‧‧‧Inorganic barrier layer

18a, 18b‧‧‧ organic barrier layer

Claims (21)

An optical film includes a core layer including a first polymer and a plurality of quantum dots dispersed in the first polymer; an organic / inorganic barrier layer including at least one inorganic barrier layer and at least one organic barrier layer, and Disposed on the core layer; and a polymer layer including a second polymer, wherein the polymer layer is disposed between the core layer and the organic / inorganic barrier layer. The optical film according to item 1 of the patent application scope, wherein the at least one inorganic barrier layer is disposed on the core layer, the at least one inorganic barrier layer is disposed on the at least one organic barrier layer, and includes The polymer layer of the second polymer is disposed on both sides of the core layer. The optical film according to item 1 of the patent application scope, wherein the polymer layer including the second polymer is disposed on both sides of the core layer, and the at least one inorganic barrier layer is disposed on the polymer And the at least one organic barrier layer is disposed on the at least one inorganic barrier layer. The optical film according to claim 1, wherein the polymer layer containing the second polymer is disposed on both sides of the core layer, and the at least one organic barrier layer is disposed on the polymer And the at least one inorganic barrier layer is disposed on the at least one organic barrier layer. The optical film according to item 1 of the patent application scope, wherein the first polymer comprises a silicone resin, an epoxy resin, a (meth) acrylate resin, a polycarbonate, a polystyrene, a polyolefin, or the like combination. The optical film according to item 1 of the scope of patent application, wherein the quantum dot is selected from the group consisting of a group II-VI compound, a group III-V compound, a group IV-IV compound, a group IV element, a group IV compound, and a combination thereof. The optical film according to item 1 of the patent application range, wherein the second polymer is selected from the group consisting of polyester, poly (meth) acrylonitrile, polycarbonate, polyolefin, cycloolefin polymer, polyimide, and Its combination. The optical film according to item 1 of the scope of patent application, wherein the inorganic barrier layer includes at least one selected from the group consisting of silicon oxide (SiO _x , 0 <x <3), aluminum oxide (Al _x O _y , 0 <x <3, 0 <y <3), tantalum oxide (Ta _x O _y , 0 <x <3, 0 <y <3), titanium oxide (TiO _x , 0 <x <3), and combinations thereof. The optical film according to item 1 of the scope of patent application, wherein the organic barrier layer comprises at least one selected from the group consisting of (meth) acrylic resin, epoxy resin, urethane resin, thiolene Resin and its combination. The optical film according to item 1 of the patent application scope, wherein the optical film further includes a protective layer on an outermost surface of the optical film. The optical film of claim 10, wherein the protective layer comprises a polymer selected from the group consisting of polyester, poly (meth) acrylonitrile, polycarbonate, polyolefin, cycloolefin polymer, poly Hydrazone and combinations thereof. The optical film according to item 1 of the scope of patent application, wherein the optical film has grooves and protrusions on its outermost surface. A method of manufacturing an optical film, comprising: preparing a barrier film by depositing an inorganic oxide on a polymer layer including a second polymer to form an inorganic barrier layer, and then coating the inorganic barrier layer with An organic barrier layer composition of a curable monomer, an initiator, and a solvent, and then curing the organic barrier layer composition to form an organic barrier layer, or coating a polymer layer including a curable monomer on a polymer layer including a second polymer An organic barrier layer composition of a polymer, an initiator and a solvent, and then curing the organic barrier layer composition to form an organic barrier layer, and then depositing an inorganic oxide on the organic barrier layer to form an inorganic barrier layer; and The polymer layer at the outermost surface of the barrier film is transferred to both sides of a core layer, and the core layer includes a plurality of quantum dots dispersed in a first polymer. The method for manufacturing an optical film according to item 13 of the scope of patent application, wherein the first polymer is selected from the group consisting of silicone resin, epoxy resin, (meth) acrylate resin, polycarbonate, polystyrene, Polyolefins and combinations thereof. The method for manufacturing an optical film according to item 13 of the scope of patent application, wherein the second polymer is selected from the group consisting of polyester, poly (meth) acrylonitrile, polycarbonate, polyolefin, cycloolefin polymer, and polyfluorene Imine and combinations thereof. The method for manufacturing an optical film according to item 13 of the scope of patent application, wherein the inorganic barrier layer comprises at least one selected from the group consisting of silicon oxide (SiO _x , 0 <x <3), aluminum oxide (Al _x O _y , 0 <x <3, 0 <y <3), tantalum oxide (Ta _x O _y , 0 <x <3, 0 <y <3), titanium oxide (TiO _x , 0 <x <3), and Its combination. The method for manufacturing an optical film according to item 13 of the scope of patent application, wherein the organic barrier layer comprises at least one selected from the group consisting of (meth) acrylic resin, epoxy resin, urethane resin, Thiolene resins and combinations thereof. The method for manufacturing an optical film according to item 13 of the patent application scope, wherein the method for manufacturing an optical film further comprises: forming a protective layer on an outermost surface of the optical film. The method for manufacturing an optical film according to item 13 of the scope of patent application, wherein the curable monomer is to provide a (meth) acrylic resin, an epoxy resin, a urethane resin, a thiolene resin after curing. Or a combination thereof. A backlight unit includes the optical film according to one of items 1 to 12 of the scope of patent application. A display device includes the optical film according to one of items 1 to 12 of the scope of patent application.